Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2002-2007 Niels Provos <provos@citi.umich.edu> |
| 3 | * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include "event2/event-config.h" |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 29 | #include "evconfig-private.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 30 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 31 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 32 | #include <winsock2.h> |
| 33 | #include <windows.h> |
| 34 | #include <io.h> |
| 35 | #endif |
| 36 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 37 | #ifdef EVENT__HAVE_VASPRINTF |
| 38 | /* If we have vasprintf, we need to define _GNU_SOURCE before we include |
| 39 | * stdio.h. This comes from evconfig-private.h. |
| 40 | */ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 41 | #endif |
| 42 | |
| 43 | #include <sys/types.h> |
| 44 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 45 | #ifdef EVENT__HAVE_SYS_TIME_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 46 | #include <sys/time.h> |
| 47 | #endif |
| 48 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 49 | #ifdef EVENT__HAVE_SYS_SOCKET_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 50 | #include <sys/socket.h> |
| 51 | #endif |
| 52 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 53 | #ifdef EVENT__HAVE_SYS_UIO_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 54 | #include <sys/uio.h> |
| 55 | #endif |
| 56 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 57 | #ifdef EVENT__HAVE_SYS_IOCTL_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 58 | #include <sys/ioctl.h> |
| 59 | #endif |
| 60 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 61 | #ifdef EVENT__HAVE_SYS_MMAN_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 62 | #include <sys/mman.h> |
| 63 | #endif |
| 64 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 65 | #ifdef EVENT__HAVE_SYS_SENDFILE_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 66 | #include <sys/sendfile.h> |
| 67 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 68 | #ifdef EVENT__HAVE_SYS_STAT_H |
| 69 | #include <sys/stat.h> |
| 70 | #endif |
| 71 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 72 | |
| 73 | #include <errno.h> |
| 74 | #include <stdio.h> |
| 75 | #include <stdlib.h> |
| 76 | #include <string.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 77 | #ifdef EVENT__HAVE_STDARG_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 78 | #include <stdarg.h> |
| 79 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 80 | #ifdef EVENT__HAVE_UNISTD_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 81 | #include <unistd.h> |
| 82 | #endif |
| 83 | #include <limits.h> |
| 84 | |
| 85 | #include "event2/event.h" |
| 86 | #include "event2/buffer.h" |
| 87 | #include "event2/buffer_compat.h" |
| 88 | #include "event2/bufferevent.h" |
| 89 | #include "event2/bufferevent_compat.h" |
| 90 | #include "event2/bufferevent_struct.h" |
| 91 | #include "event2/thread.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 92 | #include "log-internal.h" |
| 93 | #include "mm-internal.h" |
| 94 | #include "util-internal.h" |
| 95 | #include "evthread-internal.h" |
| 96 | #include "evbuffer-internal.h" |
| 97 | #include "bufferevent-internal.h" |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 98 | #include "event-internal.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 99 | |
| 100 | /* some systems do not have MAP_FAILED */ |
| 101 | #ifndef MAP_FAILED |
| 102 | #define MAP_FAILED ((void *)-1) |
| 103 | #endif |
| 104 | |
| 105 | /* send file support */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 106 | #if defined(EVENT__HAVE_SYS_SENDFILE_H) && defined(EVENT__HAVE_SENDFILE) && defined(__linux__) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 107 | #define USE_SENDFILE 1 |
| 108 | #define SENDFILE_IS_LINUX 1 |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 109 | #elif defined(EVENT__HAVE_SENDFILE) && defined(__FreeBSD__) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 110 | #define USE_SENDFILE 1 |
| 111 | #define SENDFILE_IS_FREEBSD 1 |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 112 | #elif defined(EVENT__HAVE_SENDFILE) && defined(__APPLE__) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 113 | #define USE_SENDFILE 1 |
| 114 | #define SENDFILE_IS_MACOSX 1 |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 115 | #elif defined(EVENT__HAVE_SENDFILE) && defined(__sun__) && defined(__svr4__) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 116 | #define USE_SENDFILE 1 |
| 117 | #define SENDFILE_IS_SOLARIS 1 |
| 118 | #endif |
| 119 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 120 | /* Mask of user-selectable callback flags. */ |
| 121 | #define EVBUFFER_CB_USER_FLAGS 0xffff |
| 122 | /* Mask of all internal-use-only flags. */ |
| 123 | #define EVBUFFER_CB_INTERNAL_FLAGS 0xffff0000 |
| 124 | |
| 125 | /* Flag set if the callback is using the cb_obsolete function pointer */ |
| 126 | #define EVBUFFER_CB_OBSOLETE 0x00040000 |
| 127 | |
| 128 | /* evbuffer_chain support */ |
| 129 | #define CHAIN_SPACE_PTR(ch) ((ch)->buffer + (ch)->misalign + (ch)->off) |
| 130 | #define CHAIN_SPACE_LEN(ch) ((ch)->flags & EVBUFFER_IMMUTABLE ? \ |
| 131 | 0 : (ch)->buffer_len - ((ch)->misalign + (ch)->off)) |
| 132 | |
| 133 | #define CHAIN_PINNED(ch) (((ch)->flags & EVBUFFER_MEM_PINNED_ANY) != 0) |
| 134 | #define CHAIN_PINNED_R(ch) (((ch)->flags & EVBUFFER_MEM_PINNED_R) != 0) |
| 135 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 136 | /* evbuffer_ptr support */ |
| 137 | #define PTR_NOT_FOUND(ptr) do { \ |
| 138 | (ptr)->pos = -1; \ |
| 139 | (ptr)->internal_.chain = NULL; \ |
| 140 | (ptr)->internal_.pos_in_chain = 0; \ |
| 141 | } while (0) |
| 142 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 143 | static void evbuffer_chain_align(struct evbuffer_chain *chain); |
| 144 | static int evbuffer_chain_should_realign(struct evbuffer_chain *chain, |
| 145 | size_t datalen); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 146 | static void evbuffer_deferred_callback(struct event_callback *cb, void *arg); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 147 | static int evbuffer_ptr_memcmp(const struct evbuffer *buf, |
| 148 | const struct evbuffer_ptr *pos, const char *mem, size_t len); |
| 149 | static struct evbuffer_chain *evbuffer_expand_singlechain(struct evbuffer *buf, |
| 150 | size_t datlen); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 151 | static int evbuffer_ptr_subtract(struct evbuffer *buf, struct evbuffer_ptr *pos, |
| 152 | size_t howfar); |
| 153 | static int evbuffer_file_segment_materialize(struct evbuffer_file_segment *seg); |
| 154 | static inline void evbuffer_chain_incref(struct evbuffer_chain *chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 155 | |
| 156 | static struct evbuffer_chain * |
| 157 | evbuffer_chain_new(size_t size) |
| 158 | { |
| 159 | struct evbuffer_chain *chain; |
| 160 | size_t to_alloc; |
| 161 | |
| 162 | if (size > EVBUFFER_CHAIN_MAX - EVBUFFER_CHAIN_SIZE) |
| 163 | return (NULL); |
| 164 | |
| 165 | size += EVBUFFER_CHAIN_SIZE; |
| 166 | |
| 167 | /* get the next largest memory that can hold the buffer */ |
| 168 | if (size < EVBUFFER_CHAIN_MAX / 2) { |
| 169 | to_alloc = MIN_BUFFER_SIZE; |
| 170 | while (to_alloc < size) { |
| 171 | to_alloc <<= 1; |
| 172 | } |
| 173 | } else { |
| 174 | to_alloc = size; |
| 175 | } |
| 176 | |
| 177 | /* we get everything in one chunk */ |
| 178 | if ((chain = mm_malloc(to_alloc)) == NULL) |
| 179 | return (NULL); |
| 180 | |
| 181 | memset(chain, 0, EVBUFFER_CHAIN_SIZE); |
| 182 | |
| 183 | chain->buffer_len = to_alloc - EVBUFFER_CHAIN_SIZE; |
| 184 | |
| 185 | /* this way we can manipulate the buffer to different addresses, |
| 186 | * which is required for mmap for example. |
| 187 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 188 | chain->buffer = EVBUFFER_CHAIN_EXTRA(unsigned char, chain); |
| 189 | |
| 190 | chain->refcnt = 1; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 191 | |
| 192 | return (chain); |
| 193 | } |
| 194 | |
| 195 | static inline void |
| 196 | evbuffer_chain_free(struct evbuffer_chain *chain) |
| 197 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 198 | EVUTIL_ASSERT(chain->refcnt > 0); |
| 199 | if (--chain->refcnt > 0) { |
| 200 | /* chain is still referenced by other chains */ |
| 201 | return; |
| 202 | } |
| 203 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 204 | if (CHAIN_PINNED(chain)) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 205 | /* will get freed once no longer dangling */ |
| 206 | chain->refcnt++; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 207 | chain->flags |= EVBUFFER_DANGLING; |
| 208 | return; |
| 209 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 210 | |
| 211 | /* safe to release chain, it's either a referencing |
| 212 | * chain or all references to it have been freed */ |
| 213 | if (chain->flags & EVBUFFER_REFERENCE) { |
| 214 | struct evbuffer_chain_reference *info = |
| 215 | EVBUFFER_CHAIN_EXTRA( |
| 216 | struct evbuffer_chain_reference, |
| 217 | chain); |
| 218 | if (info->cleanupfn) |
| 219 | (*info->cleanupfn)(chain->buffer, |
| 220 | chain->buffer_len, |
| 221 | info->extra); |
| 222 | } |
| 223 | if (chain->flags & EVBUFFER_FILESEGMENT) { |
| 224 | struct evbuffer_chain_file_segment *info = |
| 225 | EVBUFFER_CHAIN_EXTRA( |
| 226 | struct evbuffer_chain_file_segment, |
| 227 | chain); |
| 228 | if (info->segment) { |
| 229 | #ifdef _WIN32 |
| 230 | if (info->segment->is_mapping) |
| 231 | UnmapViewOfFile(chain->buffer); |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 232 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 233 | evbuffer_file_segment_free(info->segment); |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 234 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 235 | } |
| 236 | if (chain->flags & EVBUFFER_MULTICAST) { |
| 237 | struct evbuffer_multicast_parent *info = |
| 238 | EVBUFFER_CHAIN_EXTRA( |
| 239 | struct evbuffer_multicast_parent, |
| 240 | chain); |
| 241 | /* referencing chain is being freed, decrease |
| 242 | * refcounts of source chain and associated |
| 243 | * evbuffer (which get freed once both reach |
| 244 | * zero) */ |
| 245 | EVUTIL_ASSERT(info->source != NULL); |
| 246 | EVUTIL_ASSERT(info->parent != NULL); |
| 247 | EVBUFFER_LOCK(info->source); |
| 248 | evbuffer_chain_free(info->parent); |
| 249 | evbuffer_decref_and_unlock_(info->source); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | mm_free(chain); |
| 253 | } |
| 254 | |
| 255 | static void |
| 256 | evbuffer_free_all_chains(struct evbuffer_chain *chain) |
| 257 | { |
| 258 | struct evbuffer_chain *next; |
| 259 | for (; chain; chain = next) { |
| 260 | next = chain->next; |
| 261 | evbuffer_chain_free(chain); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | #ifndef NDEBUG |
| 266 | static int |
| 267 | evbuffer_chains_all_empty(struct evbuffer_chain *chain) |
| 268 | { |
| 269 | for (; chain; chain = chain->next) { |
| 270 | if (chain->off) |
| 271 | return 0; |
| 272 | } |
| 273 | return 1; |
| 274 | } |
| 275 | #else |
| 276 | /* The definition is needed for EVUTIL_ASSERT, which uses sizeof to avoid |
| 277 | "unused variable" warnings. */ |
| 278 | static inline int evbuffer_chains_all_empty(struct evbuffer_chain *chain) { |
| 279 | return 1; |
| 280 | } |
| 281 | #endif |
| 282 | |
| 283 | /* Free all trailing chains in 'buf' that are neither pinned nor empty, prior |
| 284 | * to replacing them all with a new chain. Return a pointer to the place |
| 285 | * where the new chain will go. |
| 286 | * |
| 287 | * Internal; requires lock. The caller must fix up buf->last and buf->first |
| 288 | * as needed; they might have been freed. |
| 289 | */ |
| 290 | static struct evbuffer_chain ** |
| 291 | evbuffer_free_trailing_empty_chains(struct evbuffer *buf) |
| 292 | { |
| 293 | struct evbuffer_chain **ch = buf->last_with_datap; |
| 294 | /* Find the first victim chain. It might be *last_with_datap */ |
| 295 | while ((*ch) && ((*ch)->off != 0 || CHAIN_PINNED(*ch))) |
| 296 | ch = &(*ch)->next; |
| 297 | if (*ch) { |
| 298 | EVUTIL_ASSERT(evbuffer_chains_all_empty(*ch)); |
| 299 | evbuffer_free_all_chains(*ch); |
| 300 | *ch = NULL; |
| 301 | } |
| 302 | return ch; |
| 303 | } |
| 304 | |
| 305 | /* Add a single chain 'chain' to the end of 'buf', freeing trailing empty |
| 306 | * chains as necessary. Requires lock. Does not schedule callbacks. |
| 307 | */ |
| 308 | static void |
| 309 | evbuffer_chain_insert(struct evbuffer *buf, |
| 310 | struct evbuffer_chain *chain) |
| 311 | { |
| 312 | ASSERT_EVBUFFER_LOCKED(buf); |
| 313 | if (*buf->last_with_datap == NULL) { |
| 314 | /* There are no chains data on the buffer at all. */ |
| 315 | EVUTIL_ASSERT(buf->last_with_datap == &buf->first); |
| 316 | EVUTIL_ASSERT(buf->first == NULL); |
| 317 | buf->first = buf->last = chain; |
| 318 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 319 | struct evbuffer_chain **chp; |
| 320 | chp = evbuffer_free_trailing_empty_chains(buf); |
| 321 | *chp = chain; |
| 322 | if (chain->off) |
| 323 | buf->last_with_datap = chp; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 324 | buf->last = chain; |
| 325 | } |
| 326 | buf->total_len += chain->off; |
| 327 | } |
| 328 | |
| 329 | static inline struct evbuffer_chain * |
| 330 | evbuffer_chain_insert_new(struct evbuffer *buf, size_t datlen) |
| 331 | { |
| 332 | struct evbuffer_chain *chain; |
| 333 | if ((chain = evbuffer_chain_new(datlen)) == NULL) |
| 334 | return NULL; |
| 335 | evbuffer_chain_insert(buf, chain); |
| 336 | return chain; |
| 337 | } |
| 338 | |
| 339 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 340 | evbuffer_chain_pin_(struct evbuffer_chain *chain, unsigned flag) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 341 | { |
| 342 | EVUTIL_ASSERT((chain->flags & flag) == 0); |
| 343 | chain->flags |= flag; |
| 344 | } |
| 345 | |
| 346 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 347 | evbuffer_chain_unpin_(struct evbuffer_chain *chain, unsigned flag) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 348 | { |
| 349 | EVUTIL_ASSERT((chain->flags & flag) != 0); |
| 350 | chain->flags &= ~flag; |
| 351 | if (chain->flags & EVBUFFER_DANGLING) |
| 352 | evbuffer_chain_free(chain); |
| 353 | } |
| 354 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 355 | static inline void |
| 356 | evbuffer_chain_incref(struct evbuffer_chain *chain) |
| 357 | { |
| 358 | ++chain->refcnt; |
| 359 | } |
| 360 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 361 | struct evbuffer * |
| 362 | evbuffer_new(void) |
| 363 | { |
| 364 | struct evbuffer *buffer; |
| 365 | |
| 366 | buffer = mm_calloc(1, sizeof(struct evbuffer)); |
| 367 | if (buffer == NULL) |
| 368 | return (NULL); |
| 369 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 370 | LIST_INIT(&buffer->callbacks); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 371 | buffer->refcnt = 1; |
| 372 | buffer->last_with_datap = &buffer->first; |
| 373 | |
| 374 | return (buffer); |
| 375 | } |
| 376 | |
| 377 | int |
| 378 | evbuffer_set_flags(struct evbuffer *buf, ev_uint64_t flags) |
| 379 | { |
| 380 | EVBUFFER_LOCK(buf); |
| 381 | buf->flags |= (ev_uint32_t)flags; |
| 382 | EVBUFFER_UNLOCK(buf); |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | int |
| 387 | evbuffer_clear_flags(struct evbuffer *buf, ev_uint64_t flags) |
| 388 | { |
| 389 | EVBUFFER_LOCK(buf); |
| 390 | buf->flags &= ~(ev_uint32_t)flags; |
| 391 | EVBUFFER_UNLOCK(buf); |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 396 | evbuffer_incref_(struct evbuffer *buf) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 397 | { |
| 398 | EVBUFFER_LOCK(buf); |
| 399 | ++buf->refcnt; |
| 400 | EVBUFFER_UNLOCK(buf); |
| 401 | } |
| 402 | |
| 403 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 404 | evbuffer_incref_and_lock_(struct evbuffer *buf) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 405 | { |
| 406 | EVBUFFER_LOCK(buf); |
| 407 | ++buf->refcnt; |
| 408 | } |
| 409 | |
| 410 | int |
| 411 | evbuffer_defer_callbacks(struct evbuffer *buffer, struct event_base *base) |
| 412 | { |
| 413 | EVBUFFER_LOCK(buffer); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 414 | buffer->cb_queue = base; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 415 | buffer->deferred_cbs = 1; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 416 | event_deferred_cb_init_(&buffer->deferred, |
| 417 | event_base_get_npriorities(base) / 2, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 418 | evbuffer_deferred_callback, buffer); |
| 419 | EVBUFFER_UNLOCK(buffer); |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | int |
| 424 | evbuffer_enable_locking(struct evbuffer *buf, void *lock) |
| 425 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 426 | #ifdef EVENT__DISABLE_THREAD_SUPPORT |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 427 | return -1; |
| 428 | #else |
| 429 | if (buf->lock) |
| 430 | return -1; |
| 431 | |
| 432 | if (!lock) { |
| 433 | EVTHREAD_ALLOC_LOCK(lock, EVTHREAD_LOCKTYPE_RECURSIVE); |
| 434 | if (!lock) |
| 435 | return -1; |
| 436 | buf->lock = lock; |
| 437 | buf->own_lock = 1; |
| 438 | } else { |
| 439 | buf->lock = lock; |
| 440 | buf->own_lock = 0; |
| 441 | } |
| 442 | |
| 443 | return 0; |
| 444 | #endif |
| 445 | } |
| 446 | |
| 447 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 448 | evbuffer_set_parent_(struct evbuffer *buf, struct bufferevent *bev) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 449 | { |
| 450 | EVBUFFER_LOCK(buf); |
| 451 | buf->parent = bev; |
| 452 | EVBUFFER_UNLOCK(buf); |
| 453 | } |
| 454 | |
| 455 | static void |
| 456 | evbuffer_run_callbacks(struct evbuffer *buffer, int running_deferred) |
| 457 | { |
| 458 | struct evbuffer_cb_entry *cbent, *next; |
| 459 | struct evbuffer_cb_info info; |
| 460 | size_t new_size; |
| 461 | ev_uint32_t mask, masked_val; |
| 462 | int clear = 1; |
| 463 | |
| 464 | if (running_deferred) { |
| 465 | mask = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED; |
| 466 | masked_val = EVBUFFER_CB_ENABLED; |
| 467 | } else if (buffer->deferred_cbs) { |
| 468 | mask = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED; |
| 469 | masked_val = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED; |
| 470 | /* Don't zero-out n_add/n_del, since the deferred callbacks |
| 471 | will want to see them. */ |
| 472 | clear = 0; |
| 473 | } else { |
| 474 | mask = EVBUFFER_CB_ENABLED; |
| 475 | masked_val = EVBUFFER_CB_ENABLED; |
| 476 | } |
| 477 | |
| 478 | ASSERT_EVBUFFER_LOCKED(buffer); |
| 479 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 480 | if (LIST_EMPTY(&buffer->callbacks)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 481 | buffer->n_add_for_cb = buffer->n_del_for_cb = 0; |
| 482 | return; |
| 483 | } |
| 484 | if (buffer->n_add_for_cb == 0 && buffer->n_del_for_cb == 0) |
| 485 | return; |
| 486 | |
| 487 | new_size = buffer->total_len; |
| 488 | info.orig_size = new_size + buffer->n_del_for_cb - buffer->n_add_for_cb; |
| 489 | info.n_added = buffer->n_add_for_cb; |
| 490 | info.n_deleted = buffer->n_del_for_cb; |
| 491 | if (clear) { |
| 492 | buffer->n_add_for_cb = 0; |
| 493 | buffer->n_del_for_cb = 0; |
| 494 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 495 | for (cbent = LIST_FIRST(&buffer->callbacks); |
| 496 | cbent != LIST_END(&buffer->callbacks); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 497 | cbent = next) { |
| 498 | /* Get the 'next' pointer now in case this callback decides |
| 499 | * to remove itself or something. */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 500 | next = LIST_NEXT(cbent, next); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 501 | |
| 502 | if ((cbent->flags & mask) != masked_val) |
| 503 | continue; |
| 504 | |
| 505 | if ((cbent->flags & EVBUFFER_CB_OBSOLETE)) |
| 506 | cbent->cb.cb_obsolete(buffer, |
| 507 | info.orig_size, new_size, cbent->cbarg); |
| 508 | else |
| 509 | cbent->cb.cb_func(buffer, &info, cbent->cbarg); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 514 | evbuffer_invoke_callbacks_(struct evbuffer *buffer) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 515 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 516 | if (LIST_EMPTY(&buffer->callbacks)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 517 | buffer->n_add_for_cb = buffer->n_del_for_cb = 0; |
| 518 | return; |
| 519 | } |
| 520 | |
| 521 | if (buffer->deferred_cbs) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 522 | if (event_deferred_cb_schedule_(buffer->cb_queue, &buffer->deferred)) { |
| 523 | evbuffer_incref_and_lock_(buffer); |
| 524 | if (buffer->parent) |
| 525 | bufferevent_incref_(buffer->parent); |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 526 | EVBUFFER_UNLOCK(buffer); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 527 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | evbuffer_run_callbacks(buffer, 0); |
| 531 | } |
| 532 | |
| 533 | static void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 534 | evbuffer_deferred_callback(struct event_callback *cb, void *arg) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 535 | { |
| 536 | struct bufferevent *parent = NULL; |
| 537 | struct evbuffer *buffer = arg; |
| 538 | |
| 539 | /* XXXX It would be better to run these callbacks without holding the |
| 540 | * lock */ |
| 541 | EVBUFFER_LOCK(buffer); |
| 542 | parent = buffer->parent; |
| 543 | evbuffer_run_callbacks(buffer, 1); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 544 | evbuffer_decref_and_unlock_(buffer); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 545 | if (parent) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 546 | bufferevent_decref_(parent); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static void |
| 550 | evbuffer_remove_all_callbacks(struct evbuffer *buffer) |
| 551 | { |
| 552 | struct evbuffer_cb_entry *cbent; |
| 553 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 554 | while ((cbent = LIST_FIRST(&buffer->callbacks))) { |
| 555 | LIST_REMOVE(cbent, next); |
| 556 | mm_free(cbent); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 557 | } |
| 558 | } |
| 559 | |
| 560 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 561 | evbuffer_decref_and_unlock_(struct evbuffer *buffer) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 562 | { |
| 563 | struct evbuffer_chain *chain, *next; |
| 564 | ASSERT_EVBUFFER_LOCKED(buffer); |
| 565 | |
| 566 | EVUTIL_ASSERT(buffer->refcnt > 0); |
| 567 | |
| 568 | if (--buffer->refcnt > 0) { |
| 569 | EVBUFFER_UNLOCK(buffer); |
| 570 | return; |
| 571 | } |
| 572 | |
| 573 | for (chain = buffer->first; chain != NULL; chain = next) { |
| 574 | next = chain->next; |
| 575 | evbuffer_chain_free(chain); |
| 576 | } |
| 577 | evbuffer_remove_all_callbacks(buffer); |
| 578 | if (buffer->deferred_cbs) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 579 | event_deferred_cb_cancel_(buffer->cb_queue, &buffer->deferred); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 580 | |
| 581 | EVBUFFER_UNLOCK(buffer); |
| 582 | if (buffer->own_lock) |
| 583 | EVTHREAD_FREE_LOCK(buffer->lock, EVTHREAD_LOCKTYPE_RECURSIVE); |
| 584 | mm_free(buffer); |
| 585 | } |
| 586 | |
| 587 | void |
| 588 | evbuffer_free(struct evbuffer *buffer) |
| 589 | { |
| 590 | EVBUFFER_LOCK(buffer); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 591 | evbuffer_decref_and_unlock_(buffer); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | void |
| 595 | evbuffer_lock(struct evbuffer *buf) |
| 596 | { |
| 597 | EVBUFFER_LOCK(buf); |
| 598 | } |
| 599 | |
| 600 | void |
| 601 | evbuffer_unlock(struct evbuffer *buf) |
| 602 | { |
| 603 | EVBUFFER_UNLOCK(buf); |
| 604 | } |
| 605 | |
| 606 | size_t |
| 607 | evbuffer_get_length(const struct evbuffer *buffer) |
| 608 | { |
| 609 | size_t result; |
| 610 | |
| 611 | EVBUFFER_LOCK(buffer); |
| 612 | |
| 613 | result = (buffer->total_len); |
| 614 | |
| 615 | EVBUFFER_UNLOCK(buffer); |
| 616 | |
| 617 | return result; |
| 618 | } |
| 619 | |
| 620 | size_t |
| 621 | evbuffer_get_contiguous_space(const struct evbuffer *buf) |
| 622 | { |
| 623 | struct evbuffer_chain *chain; |
| 624 | size_t result; |
| 625 | |
| 626 | EVBUFFER_LOCK(buf); |
| 627 | chain = buf->first; |
| 628 | result = (chain != NULL ? chain->off : 0); |
| 629 | EVBUFFER_UNLOCK(buf); |
| 630 | |
| 631 | return result; |
| 632 | } |
| 633 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 634 | size_t |
| 635 | evbuffer_add_iovec(struct evbuffer * buf, struct evbuffer_iovec * vec, int n_vec) { |
| 636 | int n; |
| 637 | size_t res; |
| 638 | size_t to_alloc; |
| 639 | |
| 640 | EVBUFFER_LOCK(buf); |
| 641 | |
| 642 | res = to_alloc = 0; |
| 643 | |
| 644 | for (n = 0; n < n_vec; n++) { |
| 645 | to_alloc += vec[n].iov_len; |
| 646 | } |
| 647 | |
| 648 | if (evbuffer_expand_fast_(buf, to_alloc, 2) < 0) { |
| 649 | goto done; |
| 650 | } |
| 651 | |
| 652 | for (n = 0; n < n_vec; n++) { |
| 653 | /* XXX each 'add' call here does a bunch of setup that's |
| 654 | * obviated by evbuffer_expand_fast_, and some cleanup that we |
| 655 | * would like to do only once. Instead we should just extract |
| 656 | * the part of the code that's needed. */ |
| 657 | |
| 658 | if (evbuffer_add(buf, vec[n].iov_base, vec[n].iov_len) < 0) { |
| 659 | goto done; |
| 660 | } |
| 661 | |
| 662 | res += vec[n].iov_len; |
| 663 | } |
| 664 | |
| 665 | done: |
| 666 | EVBUFFER_UNLOCK(buf); |
| 667 | return res; |
| 668 | } |
| 669 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 670 | int |
| 671 | evbuffer_reserve_space(struct evbuffer *buf, ev_ssize_t size, |
| 672 | struct evbuffer_iovec *vec, int n_vecs) |
| 673 | { |
| 674 | struct evbuffer_chain *chain, **chainp; |
| 675 | int n = -1; |
| 676 | |
| 677 | EVBUFFER_LOCK(buf); |
| 678 | if (buf->freeze_end) |
| 679 | goto done; |
| 680 | if (n_vecs < 1) |
| 681 | goto done; |
| 682 | if (n_vecs == 1) { |
| 683 | if ((chain = evbuffer_expand_singlechain(buf, size)) == NULL) |
| 684 | goto done; |
| 685 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 686 | vec[0].iov_base = (void *)CHAIN_SPACE_PTR(chain); |
| 687 | vec[0].iov_len = (size_t)CHAIN_SPACE_LEN(chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 688 | EVUTIL_ASSERT(size<0 || (size_t)vec[0].iov_len >= (size_t)size); |
| 689 | n = 1; |
| 690 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 691 | if (evbuffer_expand_fast_(buf, size, n_vecs)<0) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 692 | goto done; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 693 | n = evbuffer_read_setup_vecs_(buf, size, vec, n_vecs, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 694 | &chainp, 0); |
| 695 | } |
| 696 | |
| 697 | done: |
| 698 | EVBUFFER_UNLOCK(buf); |
| 699 | return n; |
| 700 | |
| 701 | } |
| 702 | |
| 703 | static int |
| 704 | advance_last_with_data(struct evbuffer *buf) |
| 705 | { |
| 706 | int n = 0; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 707 | struct evbuffer_chain **chainp = buf->last_with_datap; |
| 708 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 709 | ASSERT_EVBUFFER_LOCKED(buf); |
| 710 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 711 | if (!*chainp) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 712 | return 0; |
| 713 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 714 | while ((*chainp)->next) { |
| 715 | chainp = &(*chainp)->next; |
| 716 | if ((*chainp)->off) |
| 717 | buf->last_with_datap = chainp; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 718 | ++n; |
| 719 | } |
| 720 | return n; |
| 721 | } |
| 722 | |
| 723 | int |
| 724 | evbuffer_commit_space(struct evbuffer *buf, |
| 725 | struct evbuffer_iovec *vec, int n_vecs) |
| 726 | { |
| 727 | struct evbuffer_chain *chain, **firstchainp, **chainp; |
| 728 | int result = -1; |
| 729 | size_t added = 0; |
| 730 | int i; |
| 731 | |
| 732 | EVBUFFER_LOCK(buf); |
| 733 | |
| 734 | if (buf->freeze_end) |
| 735 | goto done; |
| 736 | if (n_vecs == 0) { |
| 737 | result = 0; |
| 738 | goto done; |
| 739 | } else if (n_vecs == 1 && |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 740 | (buf->last && vec[0].iov_base == (void *)CHAIN_SPACE_PTR(buf->last))) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 741 | /* The user only got or used one chain; it might not |
| 742 | * be the first one with space in it. */ |
| 743 | if ((size_t)vec[0].iov_len > (size_t)CHAIN_SPACE_LEN(buf->last)) |
| 744 | goto done; |
| 745 | buf->last->off += vec[0].iov_len; |
| 746 | added = vec[0].iov_len; |
| 747 | if (added) |
| 748 | advance_last_with_data(buf); |
| 749 | goto okay; |
| 750 | } |
| 751 | |
| 752 | /* Advance 'firstchain' to the first chain with space in it. */ |
| 753 | firstchainp = buf->last_with_datap; |
| 754 | if (!*firstchainp) |
| 755 | goto done; |
| 756 | if (CHAIN_SPACE_LEN(*firstchainp) == 0) { |
| 757 | firstchainp = &(*firstchainp)->next; |
| 758 | } |
| 759 | |
| 760 | chain = *firstchainp; |
| 761 | /* pass 1: make sure that the pointers and lengths of vecs[] are in |
| 762 | * bounds before we try to commit anything. */ |
| 763 | for (i=0; i<n_vecs; ++i) { |
| 764 | if (!chain) |
| 765 | goto done; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 766 | if (vec[i].iov_base != (void *)CHAIN_SPACE_PTR(chain) || |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 767 | (size_t)vec[i].iov_len > CHAIN_SPACE_LEN(chain)) |
| 768 | goto done; |
| 769 | chain = chain->next; |
| 770 | } |
| 771 | /* pass 2: actually adjust all the chains. */ |
| 772 | chainp = firstchainp; |
| 773 | for (i=0; i<n_vecs; ++i) { |
| 774 | (*chainp)->off += vec[i].iov_len; |
| 775 | added += vec[i].iov_len; |
| 776 | if (vec[i].iov_len) { |
| 777 | buf->last_with_datap = chainp; |
| 778 | } |
| 779 | chainp = &(*chainp)->next; |
| 780 | } |
| 781 | |
| 782 | okay: |
| 783 | buf->total_len += added; |
| 784 | buf->n_add_for_cb += added; |
| 785 | result = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 786 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 787 | |
| 788 | done: |
| 789 | EVBUFFER_UNLOCK(buf); |
| 790 | return result; |
| 791 | } |
| 792 | |
| 793 | static inline int |
| 794 | HAS_PINNED_R(struct evbuffer *buf) |
| 795 | { |
| 796 | return (buf->last && CHAIN_PINNED_R(buf->last)); |
| 797 | } |
| 798 | |
| 799 | static inline void |
| 800 | ZERO_CHAIN(struct evbuffer *dst) |
| 801 | { |
| 802 | ASSERT_EVBUFFER_LOCKED(dst); |
| 803 | dst->first = NULL; |
| 804 | dst->last = NULL; |
| 805 | dst->last_with_datap = &(dst)->first; |
| 806 | dst->total_len = 0; |
| 807 | } |
| 808 | |
| 809 | /* Prepares the contents of src to be moved to another buffer by removing |
| 810 | * read-pinned chains. The first pinned chain is saved in first, and the |
| 811 | * last in last. If src has no read-pinned chains, first and last are set |
| 812 | * to NULL. */ |
| 813 | static int |
| 814 | PRESERVE_PINNED(struct evbuffer *src, struct evbuffer_chain **first, |
| 815 | struct evbuffer_chain **last) |
| 816 | { |
| 817 | struct evbuffer_chain *chain, **pinned; |
| 818 | |
| 819 | ASSERT_EVBUFFER_LOCKED(src); |
| 820 | |
| 821 | if (!HAS_PINNED_R(src)) { |
| 822 | *first = *last = NULL; |
| 823 | return 0; |
| 824 | } |
| 825 | |
| 826 | pinned = src->last_with_datap; |
| 827 | if (!CHAIN_PINNED_R(*pinned)) |
| 828 | pinned = &(*pinned)->next; |
| 829 | EVUTIL_ASSERT(CHAIN_PINNED_R(*pinned)); |
| 830 | chain = *first = *pinned; |
| 831 | *last = src->last; |
| 832 | |
| 833 | /* If there's data in the first pinned chain, we need to allocate |
| 834 | * a new chain and copy the data over. */ |
| 835 | if (chain->off) { |
| 836 | struct evbuffer_chain *tmp; |
| 837 | |
| 838 | EVUTIL_ASSERT(pinned == src->last_with_datap); |
| 839 | tmp = evbuffer_chain_new(chain->off); |
| 840 | if (!tmp) |
| 841 | return -1; |
| 842 | memcpy(tmp->buffer, chain->buffer + chain->misalign, |
| 843 | chain->off); |
| 844 | tmp->off = chain->off; |
| 845 | *src->last_with_datap = tmp; |
| 846 | src->last = tmp; |
| 847 | chain->misalign += chain->off; |
| 848 | chain->off = 0; |
| 849 | } else { |
| 850 | src->last = *src->last_with_datap; |
| 851 | *pinned = NULL; |
| 852 | } |
| 853 | |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | static inline void |
| 858 | RESTORE_PINNED(struct evbuffer *src, struct evbuffer_chain *pinned, |
| 859 | struct evbuffer_chain *last) |
| 860 | { |
| 861 | ASSERT_EVBUFFER_LOCKED(src); |
| 862 | |
| 863 | if (!pinned) { |
| 864 | ZERO_CHAIN(src); |
| 865 | return; |
| 866 | } |
| 867 | |
| 868 | src->first = pinned; |
| 869 | src->last = last; |
| 870 | src->last_with_datap = &src->first; |
| 871 | src->total_len = 0; |
| 872 | } |
| 873 | |
| 874 | static inline void |
| 875 | COPY_CHAIN(struct evbuffer *dst, struct evbuffer *src) |
| 876 | { |
| 877 | ASSERT_EVBUFFER_LOCKED(dst); |
| 878 | ASSERT_EVBUFFER_LOCKED(src); |
| 879 | dst->first = src->first; |
| 880 | if (src->last_with_datap == &src->first) |
| 881 | dst->last_with_datap = &dst->first; |
| 882 | else |
| 883 | dst->last_with_datap = src->last_with_datap; |
| 884 | dst->last = src->last; |
| 885 | dst->total_len = src->total_len; |
| 886 | } |
| 887 | |
| 888 | static void |
| 889 | APPEND_CHAIN(struct evbuffer *dst, struct evbuffer *src) |
| 890 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 891 | struct evbuffer_chain **chp; |
| 892 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 893 | ASSERT_EVBUFFER_LOCKED(dst); |
| 894 | ASSERT_EVBUFFER_LOCKED(src); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 895 | |
| 896 | chp = evbuffer_free_trailing_empty_chains(dst); |
| 897 | *chp = src->first; |
| 898 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 899 | if (src->last_with_datap == &src->first) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 900 | dst->last_with_datap = chp; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 901 | else |
| 902 | dst->last_with_datap = src->last_with_datap; |
| 903 | dst->last = src->last; |
| 904 | dst->total_len += src->total_len; |
| 905 | } |
| 906 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 907 | static inline void |
| 908 | APPEND_CHAIN_MULTICAST(struct evbuffer *dst, struct evbuffer *src) |
| 909 | { |
| 910 | struct evbuffer_chain *tmp; |
| 911 | struct evbuffer_chain *chain = src->first; |
| 912 | struct evbuffer_multicast_parent *extra; |
| 913 | |
| 914 | ASSERT_EVBUFFER_LOCKED(dst); |
| 915 | ASSERT_EVBUFFER_LOCKED(src); |
| 916 | |
| 917 | for (; chain; chain = chain->next) { |
| 918 | if (!chain->off || chain->flags & EVBUFFER_DANGLING) { |
| 919 | /* skip empty chains */ |
| 920 | continue; |
| 921 | } |
| 922 | |
| 923 | tmp = evbuffer_chain_new(sizeof(struct evbuffer_multicast_parent)); |
| 924 | if (!tmp) { |
| 925 | event_warn("%s: out of memory", __func__); |
| 926 | return; |
| 927 | } |
| 928 | extra = EVBUFFER_CHAIN_EXTRA(struct evbuffer_multicast_parent, tmp); |
| 929 | /* reference evbuffer containing source chain so it |
| 930 | * doesn't get released while the chain is still |
| 931 | * being referenced to */ |
| 932 | evbuffer_incref_(src); |
| 933 | extra->source = src; |
| 934 | /* reference source chain which now becomes immutable */ |
| 935 | evbuffer_chain_incref(chain); |
| 936 | extra->parent = chain; |
| 937 | chain->flags |= EVBUFFER_IMMUTABLE; |
| 938 | tmp->buffer_len = chain->buffer_len; |
| 939 | tmp->misalign = chain->misalign; |
| 940 | tmp->off = chain->off; |
| 941 | tmp->flags |= EVBUFFER_MULTICAST|EVBUFFER_IMMUTABLE; |
| 942 | tmp->buffer = chain->buffer; |
| 943 | evbuffer_chain_insert(dst, tmp); |
| 944 | } |
| 945 | } |
| 946 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 947 | static void |
| 948 | PREPEND_CHAIN(struct evbuffer *dst, struct evbuffer *src) |
| 949 | { |
| 950 | ASSERT_EVBUFFER_LOCKED(dst); |
| 951 | ASSERT_EVBUFFER_LOCKED(src); |
| 952 | src->last->next = dst->first; |
| 953 | dst->first = src->first; |
| 954 | dst->total_len += src->total_len; |
| 955 | if (*dst->last_with_datap == NULL) { |
| 956 | if (src->last_with_datap == &(src)->first) |
| 957 | dst->last_with_datap = &dst->first; |
| 958 | else |
| 959 | dst->last_with_datap = src->last_with_datap; |
| 960 | } else if (dst->last_with_datap == &dst->first) { |
| 961 | dst->last_with_datap = &src->last->next; |
| 962 | } |
| 963 | } |
| 964 | |
| 965 | int |
| 966 | evbuffer_add_buffer(struct evbuffer *outbuf, struct evbuffer *inbuf) |
| 967 | { |
| 968 | struct evbuffer_chain *pinned, *last; |
| 969 | size_t in_total_len, out_total_len; |
| 970 | int result = 0; |
| 971 | |
| 972 | EVBUFFER_LOCK2(inbuf, outbuf); |
| 973 | in_total_len = inbuf->total_len; |
| 974 | out_total_len = outbuf->total_len; |
| 975 | |
| 976 | if (in_total_len == 0 || outbuf == inbuf) |
| 977 | goto done; |
| 978 | |
| 979 | if (outbuf->freeze_end || inbuf->freeze_start) { |
| 980 | result = -1; |
| 981 | goto done; |
| 982 | } |
| 983 | |
| 984 | if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) { |
| 985 | result = -1; |
| 986 | goto done; |
| 987 | } |
| 988 | |
| 989 | if (out_total_len == 0) { |
| 990 | /* There might be an empty chain at the start of outbuf; free |
| 991 | * it. */ |
| 992 | evbuffer_free_all_chains(outbuf->first); |
| 993 | COPY_CHAIN(outbuf, inbuf); |
| 994 | } else { |
| 995 | APPEND_CHAIN(outbuf, inbuf); |
| 996 | } |
| 997 | |
| 998 | RESTORE_PINNED(inbuf, pinned, last); |
| 999 | |
| 1000 | inbuf->n_del_for_cb += in_total_len; |
| 1001 | outbuf->n_add_for_cb += in_total_len; |
| 1002 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1003 | evbuffer_invoke_callbacks_(inbuf); |
| 1004 | evbuffer_invoke_callbacks_(outbuf); |
| 1005 | |
| 1006 | done: |
| 1007 | EVBUFFER_UNLOCK2(inbuf, outbuf); |
| 1008 | return result; |
| 1009 | } |
| 1010 | |
| 1011 | int |
| 1012 | evbuffer_add_buffer_reference(struct evbuffer *outbuf, struct evbuffer *inbuf) |
| 1013 | { |
| 1014 | size_t in_total_len, out_total_len; |
| 1015 | struct evbuffer_chain *chain; |
| 1016 | int result = 0; |
| 1017 | |
| 1018 | EVBUFFER_LOCK2(inbuf, outbuf); |
| 1019 | in_total_len = inbuf->total_len; |
| 1020 | out_total_len = outbuf->total_len; |
| 1021 | chain = inbuf->first; |
| 1022 | |
| 1023 | if (in_total_len == 0) |
| 1024 | goto done; |
| 1025 | |
| 1026 | if (outbuf->freeze_end || outbuf == inbuf) { |
| 1027 | result = -1; |
| 1028 | goto done; |
| 1029 | } |
| 1030 | |
| 1031 | for (; chain; chain = chain->next) { |
| 1032 | if ((chain->flags & (EVBUFFER_FILESEGMENT|EVBUFFER_SENDFILE|EVBUFFER_MULTICAST)) != 0) { |
| 1033 | /* chain type can not be referenced */ |
| 1034 | result = -1; |
| 1035 | goto done; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | if (out_total_len == 0) { |
| 1040 | /* There might be an empty chain at the start of outbuf; free |
| 1041 | * it. */ |
| 1042 | evbuffer_free_all_chains(outbuf->first); |
| 1043 | } |
| 1044 | APPEND_CHAIN_MULTICAST(outbuf, inbuf); |
| 1045 | |
| 1046 | outbuf->n_add_for_cb += in_total_len; |
| 1047 | evbuffer_invoke_callbacks_(outbuf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1048 | |
| 1049 | done: |
| 1050 | EVBUFFER_UNLOCK2(inbuf, outbuf); |
| 1051 | return result; |
| 1052 | } |
| 1053 | |
| 1054 | int |
| 1055 | evbuffer_prepend_buffer(struct evbuffer *outbuf, struct evbuffer *inbuf) |
| 1056 | { |
| 1057 | struct evbuffer_chain *pinned, *last; |
| 1058 | size_t in_total_len, out_total_len; |
| 1059 | int result = 0; |
| 1060 | |
| 1061 | EVBUFFER_LOCK2(inbuf, outbuf); |
| 1062 | |
| 1063 | in_total_len = inbuf->total_len; |
| 1064 | out_total_len = outbuf->total_len; |
| 1065 | |
| 1066 | if (!in_total_len || inbuf == outbuf) |
| 1067 | goto done; |
| 1068 | |
| 1069 | if (outbuf->freeze_start || inbuf->freeze_start) { |
| 1070 | result = -1; |
| 1071 | goto done; |
| 1072 | } |
| 1073 | |
| 1074 | if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) { |
| 1075 | result = -1; |
| 1076 | goto done; |
| 1077 | } |
| 1078 | |
| 1079 | if (out_total_len == 0) { |
| 1080 | /* There might be an empty chain at the start of outbuf; free |
| 1081 | * it. */ |
| 1082 | evbuffer_free_all_chains(outbuf->first); |
| 1083 | COPY_CHAIN(outbuf, inbuf); |
| 1084 | } else { |
| 1085 | PREPEND_CHAIN(outbuf, inbuf); |
| 1086 | } |
| 1087 | |
| 1088 | RESTORE_PINNED(inbuf, pinned, last); |
| 1089 | |
| 1090 | inbuf->n_del_for_cb += in_total_len; |
| 1091 | outbuf->n_add_for_cb += in_total_len; |
| 1092 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1093 | evbuffer_invoke_callbacks_(inbuf); |
| 1094 | evbuffer_invoke_callbacks_(outbuf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1095 | done: |
| 1096 | EVBUFFER_UNLOCK2(inbuf, outbuf); |
| 1097 | return result; |
| 1098 | } |
| 1099 | |
| 1100 | int |
| 1101 | evbuffer_drain(struct evbuffer *buf, size_t len) |
| 1102 | { |
| 1103 | struct evbuffer_chain *chain, *next; |
| 1104 | size_t remaining, old_len; |
| 1105 | int result = 0; |
| 1106 | |
| 1107 | EVBUFFER_LOCK(buf); |
| 1108 | old_len = buf->total_len; |
| 1109 | |
| 1110 | if (old_len == 0) |
| 1111 | goto done; |
| 1112 | |
| 1113 | if (buf->freeze_start) { |
| 1114 | result = -1; |
| 1115 | goto done; |
| 1116 | } |
| 1117 | |
| 1118 | if (len >= old_len && !HAS_PINNED_R(buf)) { |
| 1119 | len = old_len; |
| 1120 | for (chain = buf->first; chain != NULL; chain = next) { |
| 1121 | next = chain->next; |
| 1122 | evbuffer_chain_free(chain); |
| 1123 | } |
| 1124 | |
| 1125 | ZERO_CHAIN(buf); |
| 1126 | } else { |
| 1127 | if (len >= old_len) |
| 1128 | len = old_len; |
| 1129 | |
| 1130 | buf->total_len -= len; |
| 1131 | remaining = len; |
| 1132 | for (chain = buf->first; |
| 1133 | remaining >= chain->off; |
| 1134 | chain = next) { |
| 1135 | next = chain->next; |
| 1136 | remaining -= chain->off; |
| 1137 | |
| 1138 | if (chain == *buf->last_with_datap) { |
| 1139 | buf->last_with_datap = &buf->first; |
| 1140 | } |
| 1141 | if (&chain->next == buf->last_with_datap) |
| 1142 | buf->last_with_datap = &buf->first; |
| 1143 | |
| 1144 | if (CHAIN_PINNED_R(chain)) { |
| 1145 | EVUTIL_ASSERT(remaining == 0); |
| 1146 | chain->misalign += chain->off; |
| 1147 | chain->off = 0; |
| 1148 | break; |
| 1149 | } else |
| 1150 | evbuffer_chain_free(chain); |
| 1151 | } |
| 1152 | |
| 1153 | buf->first = chain; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1154 | EVUTIL_ASSERT(remaining <= chain->off); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1155 | chain->misalign += remaining; |
| 1156 | chain->off -= remaining; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
| 1159 | buf->n_del_for_cb += len; |
| 1160 | /* Tell someone about changes in this buffer */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1161 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1162 | |
| 1163 | done: |
| 1164 | EVBUFFER_UNLOCK(buf); |
| 1165 | return result; |
| 1166 | } |
| 1167 | |
| 1168 | /* Reads data from an event buffer and drains the bytes read */ |
| 1169 | int |
| 1170 | evbuffer_remove(struct evbuffer *buf, void *data_out, size_t datlen) |
| 1171 | { |
| 1172 | ev_ssize_t n; |
| 1173 | EVBUFFER_LOCK(buf); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1174 | n = evbuffer_copyout_from(buf, NULL, data_out, datlen); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1175 | if (n > 0) { |
| 1176 | if (evbuffer_drain(buf, n)<0) |
| 1177 | n = -1; |
| 1178 | } |
| 1179 | EVBUFFER_UNLOCK(buf); |
| 1180 | return (int)n; |
| 1181 | } |
| 1182 | |
| 1183 | ev_ssize_t |
| 1184 | evbuffer_copyout(struct evbuffer *buf, void *data_out, size_t datlen) |
| 1185 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1186 | return evbuffer_copyout_from(buf, NULL, data_out, datlen); |
| 1187 | } |
| 1188 | |
| 1189 | ev_ssize_t |
| 1190 | evbuffer_copyout_from(struct evbuffer *buf, const struct evbuffer_ptr *pos, |
| 1191 | void *data_out, size_t datlen) |
| 1192 | { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1193 | /*XXX fails badly on sendfile case. */ |
| 1194 | struct evbuffer_chain *chain; |
| 1195 | char *data = data_out; |
| 1196 | size_t nread; |
| 1197 | ev_ssize_t result = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1198 | size_t pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1199 | |
| 1200 | EVBUFFER_LOCK(buf); |
| 1201 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1202 | if (pos) { |
| 1203 | if (datlen > (size_t)(EV_SSIZE_MAX - pos->pos)) { |
| 1204 | result = -1; |
| 1205 | goto done; |
| 1206 | } |
| 1207 | chain = pos->internal_.chain; |
| 1208 | pos_in_chain = pos->internal_.pos_in_chain; |
| 1209 | if (datlen + pos->pos > buf->total_len) |
| 1210 | datlen = buf->total_len - pos->pos; |
| 1211 | } else { |
| 1212 | chain = buf->first; |
| 1213 | pos_in_chain = 0; |
| 1214 | if (datlen > buf->total_len) |
| 1215 | datlen = buf->total_len; |
| 1216 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1217 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1218 | |
| 1219 | if (datlen == 0) |
| 1220 | goto done; |
| 1221 | |
| 1222 | if (buf->freeze_start) { |
| 1223 | result = -1; |
| 1224 | goto done; |
| 1225 | } |
| 1226 | |
| 1227 | nread = datlen; |
| 1228 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1229 | while (datlen && datlen >= chain->off - pos_in_chain) { |
| 1230 | size_t copylen = chain->off - pos_in_chain; |
| 1231 | memcpy(data, |
| 1232 | chain->buffer + chain->misalign + pos_in_chain, |
| 1233 | copylen); |
| 1234 | data += copylen; |
| 1235 | datlen -= copylen; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1236 | |
| 1237 | chain = chain->next; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1238 | pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1239 | EVUTIL_ASSERT(chain || datlen==0); |
| 1240 | } |
| 1241 | |
| 1242 | if (datlen) { |
| 1243 | EVUTIL_ASSERT(chain); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1244 | EVUTIL_ASSERT(datlen+pos_in_chain <= chain->off); |
| 1245 | |
| 1246 | memcpy(data, chain->buffer + chain->misalign + pos_in_chain, |
| 1247 | datlen); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1248 | } |
| 1249 | |
| 1250 | result = nread; |
| 1251 | done: |
| 1252 | EVBUFFER_UNLOCK(buf); |
| 1253 | return result; |
| 1254 | } |
| 1255 | |
| 1256 | /* reads data from the src buffer to the dst buffer, avoids memcpy as |
| 1257 | * possible. */ |
| 1258 | /* XXXX should return ev_ssize_t */ |
| 1259 | int |
| 1260 | evbuffer_remove_buffer(struct evbuffer *src, struct evbuffer *dst, |
| 1261 | size_t datlen) |
| 1262 | { |
| 1263 | /*XXX We should have an option to force this to be zero-copy.*/ |
| 1264 | |
| 1265 | /*XXX can fail badly on sendfile case. */ |
| 1266 | struct evbuffer_chain *chain, *previous; |
| 1267 | size_t nread = 0; |
| 1268 | int result; |
| 1269 | |
| 1270 | EVBUFFER_LOCK2(src, dst); |
| 1271 | |
| 1272 | chain = previous = src->first; |
| 1273 | |
| 1274 | if (datlen == 0 || dst == src) { |
| 1275 | result = 0; |
| 1276 | goto done; |
| 1277 | } |
| 1278 | |
| 1279 | if (dst->freeze_end || src->freeze_start) { |
| 1280 | result = -1; |
| 1281 | goto done; |
| 1282 | } |
| 1283 | |
| 1284 | /* short-cut if there is no more data buffered */ |
| 1285 | if (datlen >= src->total_len) { |
| 1286 | datlen = src->total_len; |
| 1287 | evbuffer_add_buffer(dst, src); |
| 1288 | result = (int)datlen; /*XXXX should return ev_ssize_t*/ |
| 1289 | goto done; |
| 1290 | } |
| 1291 | |
| 1292 | /* removes chains if possible */ |
| 1293 | while (chain->off <= datlen) { |
| 1294 | /* We can't remove the last with data from src unless we |
| 1295 | * remove all chains, in which case we would have done the if |
| 1296 | * block above */ |
| 1297 | EVUTIL_ASSERT(chain != *src->last_with_datap); |
| 1298 | nread += chain->off; |
| 1299 | datlen -= chain->off; |
| 1300 | previous = chain; |
| 1301 | if (src->last_with_datap == &chain->next) |
| 1302 | src->last_with_datap = &src->first; |
| 1303 | chain = chain->next; |
| 1304 | } |
| 1305 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1306 | if (chain != src->first) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1307 | /* we can remove the chain */ |
| 1308 | struct evbuffer_chain **chp; |
| 1309 | chp = evbuffer_free_trailing_empty_chains(dst); |
| 1310 | |
| 1311 | if (dst->first == NULL) { |
| 1312 | dst->first = src->first; |
| 1313 | } else { |
| 1314 | *chp = src->first; |
| 1315 | } |
| 1316 | dst->last = previous; |
| 1317 | previous->next = NULL; |
| 1318 | src->first = chain; |
| 1319 | advance_last_with_data(dst); |
| 1320 | |
| 1321 | dst->total_len += nread; |
| 1322 | dst->n_add_for_cb += nread; |
| 1323 | } |
| 1324 | |
| 1325 | /* we know that there is more data in the src buffer than |
| 1326 | * we want to read, so we manually drain the chain */ |
| 1327 | evbuffer_add(dst, chain->buffer + chain->misalign, datlen); |
| 1328 | chain->misalign += datlen; |
| 1329 | chain->off -= datlen; |
| 1330 | nread += datlen; |
| 1331 | |
| 1332 | /* You might think we would want to increment dst->n_add_for_cb |
| 1333 | * here too. But evbuffer_add above already took care of that. |
| 1334 | */ |
| 1335 | src->total_len -= nread; |
| 1336 | src->n_del_for_cb += nread; |
| 1337 | |
| 1338 | if (nread) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1339 | evbuffer_invoke_callbacks_(dst); |
| 1340 | evbuffer_invoke_callbacks_(src); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1341 | } |
| 1342 | result = (int)nread;/*XXXX should change return type */ |
| 1343 | |
| 1344 | done: |
| 1345 | EVBUFFER_UNLOCK2(src, dst); |
| 1346 | return result; |
| 1347 | } |
| 1348 | |
| 1349 | unsigned char * |
| 1350 | evbuffer_pullup(struct evbuffer *buf, ev_ssize_t size) |
| 1351 | { |
| 1352 | struct evbuffer_chain *chain, *next, *tmp, *last_with_data; |
| 1353 | unsigned char *buffer, *result = NULL; |
| 1354 | ev_ssize_t remaining; |
| 1355 | int removed_last_with_data = 0; |
| 1356 | int removed_last_with_datap = 0; |
| 1357 | |
| 1358 | EVBUFFER_LOCK(buf); |
| 1359 | |
| 1360 | chain = buf->first; |
| 1361 | |
| 1362 | if (size < 0) |
| 1363 | size = buf->total_len; |
| 1364 | /* if size > buf->total_len, we cannot guarantee to the user that she |
| 1365 | * is going to have a long enough buffer afterwards; so we return |
| 1366 | * NULL */ |
| 1367 | if (size == 0 || (size_t)size > buf->total_len) |
| 1368 | goto done; |
| 1369 | |
| 1370 | /* No need to pull up anything; the first size bytes are |
| 1371 | * already here. */ |
| 1372 | if (chain->off >= (size_t)size) { |
| 1373 | result = chain->buffer + chain->misalign; |
| 1374 | goto done; |
| 1375 | } |
| 1376 | |
| 1377 | /* Make sure that none of the chains we need to copy from is pinned. */ |
| 1378 | remaining = size - chain->off; |
| 1379 | EVUTIL_ASSERT(remaining >= 0); |
| 1380 | for (tmp=chain->next; tmp; tmp=tmp->next) { |
| 1381 | if (CHAIN_PINNED(tmp)) |
| 1382 | goto done; |
| 1383 | if (tmp->off >= (size_t)remaining) |
| 1384 | break; |
| 1385 | remaining -= tmp->off; |
| 1386 | } |
| 1387 | |
| 1388 | if (CHAIN_PINNED(chain)) { |
| 1389 | size_t old_off = chain->off; |
| 1390 | if (CHAIN_SPACE_LEN(chain) < size - chain->off) { |
| 1391 | /* not enough room at end of chunk. */ |
| 1392 | goto done; |
| 1393 | } |
| 1394 | buffer = CHAIN_SPACE_PTR(chain); |
| 1395 | tmp = chain; |
| 1396 | tmp->off = size; |
| 1397 | size -= old_off; |
| 1398 | chain = chain->next; |
| 1399 | } else if (chain->buffer_len - chain->misalign >= (size_t)size) { |
| 1400 | /* already have enough space in the first chain */ |
| 1401 | size_t old_off = chain->off; |
| 1402 | buffer = chain->buffer + chain->misalign + chain->off; |
| 1403 | tmp = chain; |
| 1404 | tmp->off = size; |
| 1405 | size -= old_off; |
| 1406 | chain = chain->next; |
| 1407 | } else { |
| 1408 | if ((tmp = evbuffer_chain_new(size)) == NULL) { |
| 1409 | event_warn("%s: out of memory", __func__); |
| 1410 | goto done; |
| 1411 | } |
| 1412 | buffer = tmp->buffer; |
| 1413 | tmp->off = size; |
| 1414 | buf->first = tmp; |
| 1415 | } |
| 1416 | |
| 1417 | /* TODO(niels): deal with buffers that point to NULL like sendfile */ |
| 1418 | |
| 1419 | /* Copy and free every chunk that will be entirely pulled into tmp */ |
| 1420 | last_with_data = *buf->last_with_datap; |
| 1421 | for (; chain != NULL && (size_t)size >= chain->off; chain = next) { |
| 1422 | next = chain->next; |
| 1423 | |
| 1424 | memcpy(buffer, chain->buffer + chain->misalign, chain->off); |
| 1425 | size -= chain->off; |
| 1426 | buffer += chain->off; |
| 1427 | if (chain == last_with_data) |
| 1428 | removed_last_with_data = 1; |
| 1429 | if (&chain->next == buf->last_with_datap) |
| 1430 | removed_last_with_datap = 1; |
| 1431 | |
| 1432 | evbuffer_chain_free(chain); |
| 1433 | } |
| 1434 | |
| 1435 | if (chain != NULL) { |
| 1436 | memcpy(buffer, chain->buffer + chain->misalign, size); |
| 1437 | chain->misalign += size; |
| 1438 | chain->off -= size; |
| 1439 | } else { |
| 1440 | buf->last = tmp; |
| 1441 | } |
| 1442 | |
| 1443 | tmp->next = chain; |
| 1444 | |
| 1445 | if (removed_last_with_data) { |
| 1446 | buf->last_with_datap = &buf->first; |
| 1447 | } else if (removed_last_with_datap) { |
| 1448 | if (buf->first->next && buf->first->next->off) |
| 1449 | buf->last_with_datap = &buf->first->next; |
| 1450 | else |
| 1451 | buf->last_with_datap = &buf->first; |
| 1452 | } |
| 1453 | |
| 1454 | result = (tmp->buffer + tmp->misalign); |
| 1455 | |
| 1456 | done: |
| 1457 | EVBUFFER_UNLOCK(buf); |
| 1458 | return result; |
| 1459 | } |
| 1460 | |
| 1461 | /* |
| 1462 | * Reads a line terminated by either '\r\n', '\n\r' or '\r' or '\n'. |
| 1463 | * The returned buffer needs to be freed by the called. |
| 1464 | */ |
| 1465 | char * |
| 1466 | evbuffer_readline(struct evbuffer *buffer) |
| 1467 | { |
| 1468 | return evbuffer_readln(buffer, NULL, EVBUFFER_EOL_ANY); |
| 1469 | } |
| 1470 | |
| 1471 | static inline ev_ssize_t |
| 1472 | evbuffer_strchr(struct evbuffer_ptr *it, const char chr) |
| 1473 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1474 | struct evbuffer_chain *chain = it->internal_.chain; |
| 1475 | size_t i = it->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1476 | while (chain != NULL) { |
| 1477 | char *buffer = (char *)chain->buffer + chain->misalign; |
| 1478 | char *cp = memchr(buffer+i, chr, chain->off-i); |
| 1479 | if (cp) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1480 | it->internal_.chain = chain; |
| 1481 | it->internal_.pos_in_chain = cp - buffer; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1482 | it->pos += (cp - buffer - i); |
| 1483 | return it->pos; |
| 1484 | } |
| 1485 | it->pos += chain->off - i; |
| 1486 | i = 0; |
| 1487 | chain = chain->next; |
| 1488 | } |
| 1489 | |
| 1490 | return (-1); |
| 1491 | } |
| 1492 | |
| 1493 | static inline char * |
| 1494 | find_eol_char(char *s, size_t len) |
| 1495 | { |
| 1496 | #define CHUNK_SZ 128 |
| 1497 | /* Lots of benchmarking found this approach to be faster in practice |
| 1498 | * than doing two memchrs over the whole buffer, doin a memchr on each |
| 1499 | * char of the buffer, or trying to emulate memchr by hand. */ |
| 1500 | char *s_end, *cr, *lf; |
| 1501 | s_end = s+len; |
| 1502 | while (s < s_end) { |
| 1503 | size_t chunk = (s + CHUNK_SZ < s_end) ? CHUNK_SZ : (s_end - s); |
| 1504 | cr = memchr(s, '\r', chunk); |
| 1505 | lf = memchr(s, '\n', chunk); |
| 1506 | if (cr) { |
| 1507 | if (lf && lf < cr) |
| 1508 | return lf; |
| 1509 | return cr; |
| 1510 | } else if (lf) { |
| 1511 | return lf; |
| 1512 | } |
| 1513 | s += CHUNK_SZ; |
| 1514 | } |
| 1515 | |
| 1516 | return NULL; |
| 1517 | #undef CHUNK_SZ |
| 1518 | } |
| 1519 | |
| 1520 | static ev_ssize_t |
| 1521 | evbuffer_find_eol_char(struct evbuffer_ptr *it) |
| 1522 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1523 | struct evbuffer_chain *chain = it->internal_.chain; |
| 1524 | size_t i = it->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1525 | while (chain != NULL) { |
| 1526 | char *buffer = (char *)chain->buffer + chain->misalign; |
| 1527 | char *cp = find_eol_char(buffer+i, chain->off-i); |
| 1528 | if (cp) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1529 | it->internal_.chain = chain; |
| 1530 | it->internal_.pos_in_chain = cp - buffer; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1531 | it->pos += (cp - buffer) - i; |
| 1532 | return it->pos; |
| 1533 | } |
| 1534 | it->pos += chain->off - i; |
| 1535 | i = 0; |
| 1536 | chain = chain->next; |
| 1537 | } |
| 1538 | |
| 1539 | return (-1); |
| 1540 | } |
| 1541 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1542 | static inline size_t |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1543 | evbuffer_strspn( |
| 1544 | struct evbuffer_ptr *ptr, const char *chrset) |
| 1545 | { |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1546 | size_t count = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1547 | struct evbuffer_chain *chain = ptr->internal_.chain; |
| 1548 | size_t i = ptr->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1549 | |
| 1550 | if (!chain) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1551 | return 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1552 | |
| 1553 | while (1) { |
| 1554 | char *buffer = (char *)chain->buffer + chain->misalign; |
| 1555 | for (; i < chain->off; ++i) { |
| 1556 | const char *p = chrset; |
| 1557 | while (*p) { |
| 1558 | if (buffer[i] == *p++) |
| 1559 | goto next; |
| 1560 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1561 | ptr->internal_.chain = chain; |
| 1562 | ptr->internal_.pos_in_chain = i; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1563 | ptr->pos += count; |
| 1564 | return count; |
| 1565 | next: |
| 1566 | ++count; |
| 1567 | } |
| 1568 | i = 0; |
| 1569 | |
| 1570 | if (! chain->next) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1571 | ptr->internal_.chain = chain; |
| 1572 | ptr->internal_.pos_in_chain = i; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1573 | ptr->pos += count; |
| 1574 | return count; |
| 1575 | } |
| 1576 | |
| 1577 | chain = chain->next; |
| 1578 | } |
| 1579 | } |
| 1580 | |
| 1581 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1582 | static inline int |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1583 | evbuffer_getchr(struct evbuffer_ptr *it) |
| 1584 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1585 | struct evbuffer_chain *chain = it->internal_.chain; |
| 1586 | size_t off = it->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1587 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1588 | if (chain == NULL) |
| 1589 | return -1; |
| 1590 | |
| 1591 | return (unsigned char)chain->buffer[chain->misalign + off]; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1592 | } |
| 1593 | |
| 1594 | struct evbuffer_ptr |
| 1595 | evbuffer_search_eol(struct evbuffer *buffer, |
| 1596 | struct evbuffer_ptr *start, size_t *eol_len_out, |
| 1597 | enum evbuffer_eol_style eol_style) |
| 1598 | { |
| 1599 | struct evbuffer_ptr it, it2; |
| 1600 | size_t extra_drain = 0; |
| 1601 | int ok = 0; |
| 1602 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1603 | /* Avoid locking in trivial edge cases */ |
| 1604 | if (start && start->internal_.chain == NULL) { |
| 1605 | PTR_NOT_FOUND(&it); |
| 1606 | if (eol_len_out) |
| 1607 | *eol_len_out = extra_drain; |
| 1608 | return it; |
| 1609 | } |
| 1610 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1611 | EVBUFFER_LOCK(buffer); |
| 1612 | |
| 1613 | if (start) { |
| 1614 | memcpy(&it, start, sizeof(it)); |
| 1615 | } else { |
| 1616 | it.pos = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1617 | it.internal_.chain = buffer->first; |
| 1618 | it.internal_.pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1619 | } |
| 1620 | |
| 1621 | /* the eol_style determines our first stop character and how many |
| 1622 | * characters we are going to drain afterwards. */ |
| 1623 | switch (eol_style) { |
| 1624 | case EVBUFFER_EOL_ANY: |
| 1625 | if (evbuffer_find_eol_char(&it) < 0) |
| 1626 | goto done; |
| 1627 | memcpy(&it2, &it, sizeof(it)); |
| 1628 | extra_drain = evbuffer_strspn(&it2, "\r\n"); |
| 1629 | break; |
| 1630 | case EVBUFFER_EOL_CRLF_STRICT: { |
| 1631 | it = evbuffer_search(buffer, "\r\n", 2, &it); |
| 1632 | if (it.pos < 0) |
| 1633 | goto done; |
| 1634 | extra_drain = 2; |
| 1635 | break; |
| 1636 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1637 | case EVBUFFER_EOL_CRLF: { |
| 1638 | ev_ssize_t start_pos = it.pos; |
| 1639 | /* Look for a LF ... */ |
| 1640 | if (evbuffer_strchr(&it, '\n') < 0) |
| 1641 | goto done; |
| 1642 | extra_drain = 1; |
| 1643 | /* ... optionally preceeded by a CR. */ |
| 1644 | if (it.pos == start_pos) |
| 1645 | break; /* If the first character is \n, don't back up */ |
| 1646 | /* This potentially does an extra linear walk over the first |
| 1647 | * few chains. Probably, that's not too expensive unless you |
| 1648 | * have a really pathological setup. */ |
| 1649 | memcpy(&it2, &it, sizeof(it)); |
| 1650 | if (evbuffer_ptr_subtract(buffer, &it2, 1)<0) |
| 1651 | break; |
| 1652 | if (evbuffer_getchr(&it2) == '\r') { |
| 1653 | memcpy(&it, &it2, sizeof(it)); |
| 1654 | extra_drain = 2; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1655 | } |
| 1656 | break; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1657 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1658 | case EVBUFFER_EOL_LF: |
| 1659 | if (evbuffer_strchr(&it, '\n') < 0) |
| 1660 | goto done; |
| 1661 | extra_drain = 1; |
| 1662 | break; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1663 | case EVBUFFER_EOL_NUL: |
| 1664 | if (evbuffer_strchr(&it, '\0') < 0) |
| 1665 | goto done; |
| 1666 | extra_drain = 1; |
| 1667 | break; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1668 | default: |
| 1669 | goto done; |
| 1670 | } |
| 1671 | |
| 1672 | ok = 1; |
| 1673 | done: |
| 1674 | EVBUFFER_UNLOCK(buffer); |
| 1675 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1676 | if (!ok) |
| 1677 | PTR_NOT_FOUND(&it); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1678 | if (eol_len_out) |
| 1679 | *eol_len_out = extra_drain; |
| 1680 | |
| 1681 | return it; |
| 1682 | } |
| 1683 | |
| 1684 | char * |
| 1685 | evbuffer_readln(struct evbuffer *buffer, size_t *n_read_out, |
| 1686 | enum evbuffer_eol_style eol_style) |
| 1687 | { |
| 1688 | struct evbuffer_ptr it; |
| 1689 | char *line; |
| 1690 | size_t n_to_copy=0, extra_drain=0; |
| 1691 | char *result = NULL; |
| 1692 | |
| 1693 | EVBUFFER_LOCK(buffer); |
| 1694 | |
| 1695 | if (buffer->freeze_start) { |
| 1696 | goto done; |
| 1697 | } |
| 1698 | |
| 1699 | it = evbuffer_search_eol(buffer, NULL, &extra_drain, eol_style); |
| 1700 | if (it.pos < 0) |
| 1701 | goto done; |
| 1702 | n_to_copy = it.pos; |
| 1703 | |
| 1704 | if ((line = mm_malloc(n_to_copy+1)) == NULL) { |
| 1705 | event_warn("%s: out of memory", __func__); |
| 1706 | goto done; |
| 1707 | } |
| 1708 | |
| 1709 | evbuffer_remove(buffer, line, n_to_copy); |
| 1710 | line[n_to_copy] = '\0'; |
| 1711 | |
| 1712 | evbuffer_drain(buffer, extra_drain); |
| 1713 | result = line; |
| 1714 | done: |
| 1715 | EVBUFFER_UNLOCK(buffer); |
| 1716 | |
| 1717 | if (n_read_out) |
| 1718 | *n_read_out = result ? n_to_copy : 0; |
| 1719 | |
| 1720 | return result; |
| 1721 | } |
| 1722 | |
| 1723 | #define EVBUFFER_CHAIN_MAX_AUTO_SIZE 4096 |
| 1724 | |
| 1725 | /* Adds data to an event buffer */ |
| 1726 | |
| 1727 | int |
| 1728 | evbuffer_add(struct evbuffer *buf, const void *data_in, size_t datlen) |
| 1729 | { |
| 1730 | struct evbuffer_chain *chain, *tmp; |
| 1731 | const unsigned char *data = data_in; |
| 1732 | size_t remain, to_alloc; |
| 1733 | int result = -1; |
| 1734 | |
| 1735 | EVBUFFER_LOCK(buf); |
| 1736 | |
| 1737 | if (buf->freeze_end) { |
| 1738 | goto done; |
| 1739 | } |
| 1740 | /* Prevent buf->total_len overflow */ |
| 1741 | if (datlen > EV_SIZE_MAX - buf->total_len) { |
| 1742 | goto done; |
| 1743 | } |
| 1744 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1745 | if (*buf->last_with_datap == NULL) { |
| 1746 | chain = buf->last; |
| 1747 | } else { |
| 1748 | chain = *buf->last_with_datap; |
| 1749 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1750 | |
| 1751 | /* If there are no chains allocated for this buffer, allocate one |
| 1752 | * big enough to hold all the data. */ |
| 1753 | if (chain == NULL) { |
| 1754 | chain = evbuffer_chain_new(datlen); |
| 1755 | if (!chain) |
| 1756 | goto done; |
| 1757 | evbuffer_chain_insert(buf, chain); |
| 1758 | } |
| 1759 | |
| 1760 | if ((chain->flags & EVBUFFER_IMMUTABLE) == 0) { |
| 1761 | /* Always true for mutable buffers */ |
| 1762 | EVUTIL_ASSERT(chain->misalign >= 0 && |
| 1763 | (ev_uint64_t)chain->misalign <= EVBUFFER_CHAIN_MAX); |
| 1764 | remain = chain->buffer_len - (size_t)chain->misalign - chain->off; |
| 1765 | if (remain >= datlen) { |
| 1766 | /* there's enough space to hold all the data in the |
| 1767 | * current last chain */ |
| 1768 | memcpy(chain->buffer + chain->misalign + chain->off, |
| 1769 | data, datlen); |
| 1770 | chain->off += datlen; |
| 1771 | buf->total_len += datlen; |
| 1772 | buf->n_add_for_cb += datlen; |
| 1773 | goto out; |
| 1774 | } else if (!CHAIN_PINNED(chain) && |
| 1775 | evbuffer_chain_should_realign(chain, datlen)) { |
| 1776 | /* we can fit the data into the misalignment */ |
| 1777 | evbuffer_chain_align(chain); |
| 1778 | |
| 1779 | memcpy(chain->buffer + chain->off, data, datlen); |
| 1780 | chain->off += datlen; |
| 1781 | buf->total_len += datlen; |
| 1782 | buf->n_add_for_cb += datlen; |
| 1783 | goto out; |
| 1784 | } |
| 1785 | } else { |
| 1786 | /* we cannot write any data to the last chain */ |
| 1787 | remain = 0; |
| 1788 | } |
| 1789 | |
| 1790 | /* we need to add another chain */ |
| 1791 | to_alloc = chain->buffer_len; |
| 1792 | if (to_alloc <= EVBUFFER_CHAIN_MAX_AUTO_SIZE/2) |
| 1793 | to_alloc <<= 1; |
| 1794 | if (datlen > to_alloc) |
| 1795 | to_alloc = datlen; |
| 1796 | tmp = evbuffer_chain_new(to_alloc); |
| 1797 | if (tmp == NULL) |
| 1798 | goto done; |
| 1799 | |
| 1800 | if (remain) { |
| 1801 | memcpy(chain->buffer + chain->misalign + chain->off, |
| 1802 | data, remain); |
| 1803 | chain->off += remain; |
| 1804 | buf->total_len += remain; |
| 1805 | buf->n_add_for_cb += remain; |
| 1806 | } |
| 1807 | |
| 1808 | data += remain; |
| 1809 | datlen -= remain; |
| 1810 | |
| 1811 | memcpy(tmp->buffer, data, datlen); |
| 1812 | tmp->off = datlen; |
| 1813 | evbuffer_chain_insert(buf, tmp); |
| 1814 | buf->n_add_for_cb += datlen; |
| 1815 | |
| 1816 | out: |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1817 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1818 | result = 0; |
| 1819 | done: |
| 1820 | EVBUFFER_UNLOCK(buf); |
| 1821 | return result; |
| 1822 | } |
| 1823 | |
| 1824 | int |
| 1825 | evbuffer_prepend(struct evbuffer *buf, const void *data, size_t datlen) |
| 1826 | { |
| 1827 | struct evbuffer_chain *chain, *tmp; |
| 1828 | int result = -1; |
| 1829 | |
| 1830 | EVBUFFER_LOCK(buf); |
| 1831 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1832 | if (datlen == 0) { |
| 1833 | result = 0; |
| 1834 | goto done; |
| 1835 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1836 | if (buf->freeze_start) { |
| 1837 | goto done; |
| 1838 | } |
| 1839 | if (datlen > EV_SIZE_MAX - buf->total_len) { |
| 1840 | goto done; |
| 1841 | } |
| 1842 | |
| 1843 | chain = buf->first; |
| 1844 | |
| 1845 | if (chain == NULL) { |
| 1846 | chain = evbuffer_chain_new(datlen); |
| 1847 | if (!chain) |
| 1848 | goto done; |
| 1849 | evbuffer_chain_insert(buf, chain); |
| 1850 | } |
| 1851 | |
| 1852 | /* we cannot touch immutable buffers */ |
| 1853 | if ((chain->flags & EVBUFFER_IMMUTABLE) == 0) { |
| 1854 | /* Always true for mutable buffers */ |
| 1855 | EVUTIL_ASSERT(chain->misalign >= 0 && |
| 1856 | (ev_uint64_t)chain->misalign <= EVBUFFER_CHAIN_MAX); |
| 1857 | |
| 1858 | /* If this chain is empty, we can treat it as |
| 1859 | * 'empty at the beginning' rather than 'empty at the end' */ |
| 1860 | if (chain->off == 0) |
| 1861 | chain->misalign = chain->buffer_len; |
| 1862 | |
| 1863 | if ((size_t)chain->misalign >= datlen) { |
| 1864 | /* we have enough space to fit everything */ |
| 1865 | memcpy(chain->buffer + chain->misalign - datlen, |
| 1866 | data, datlen); |
| 1867 | chain->off += datlen; |
| 1868 | chain->misalign -= datlen; |
| 1869 | buf->total_len += datlen; |
| 1870 | buf->n_add_for_cb += datlen; |
| 1871 | goto out; |
| 1872 | } else if (chain->misalign) { |
| 1873 | /* we can only fit some of the data. */ |
| 1874 | memcpy(chain->buffer, |
| 1875 | (char*)data + datlen - chain->misalign, |
| 1876 | (size_t)chain->misalign); |
| 1877 | chain->off += (size_t)chain->misalign; |
| 1878 | buf->total_len += (size_t)chain->misalign; |
| 1879 | buf->n_add_for_cb += (size_t)chain->misalign; |
| 1880 | datlen -= (size_t)chain->misalign; |
| 1881 | chain->misalign = 0; |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | /* we need to add another chain */ |
| 1886 | if ((tmp = evbuffer_chain_new(datlen)) == NULL) |
| 1887 | goto done; |
| 1888 | buf->first = tmp; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1889 | if (buf->last_with_datap == &buf->first && chain->off) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1890 | buf->last_with_datap = &tmp->next; |
| 1891 | |
| 1892 | tmp->next = chain; |
| 1893 | |
| 1894 | tmp->off = datlen; |
| 1895 | EVUTIL_ASSERT(datlen <= tmp->buffer_len); |
| 1896 | tmp->misalign = tmp->buffer_len - datlen; |
| 1897 | |
| 1898 | memcpy(tmp->buffer + tmp->misalign, data, datlen); |
| 1899 | buf->total_len += datlen; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1900 | buf->n_add_for_cb += datlen; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1901 | |
| 1902 | out: |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1903 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1904 | result = 0; |
| 1905 | done: |
| 1906 | EVBUFFER_UNLOCK(buf); |
| 1907 | return result; |
| 1908 | } |
| 1909 | |
| 1910 | /** Helper: realigns the memory in chain->buffer so that misalign is 0. */ |
| 1911 | static void |
| 1912 | evbuffer_chain_align(struct evbuffer_chain *chain) |
| 1913 | { |
| 1914 | EVUTIL_ASSERT(!(chain->flags & EVBUFFER_IMMUTABLE)); |
| 1915 | EVUTIL_ASSERT(!(chain->flags & EVBUFFER_MEM_PINNED_ANY)); |
| 1916 | memmove(chain->buffer, chain->buffer + chain->misalign, chain->off); |
| 1917 | chain->misalign = 0; |
| 1918 | } |
| 1919 | |
| 1920 | #define MAX_TO_COPY_IN_EXPAND 4096 |
| 1921 | #define MAX_TO_REALIGN_IN_EXPAND 2048 |
| 1922 | |
| 1923 | /** Helper: return true iff we should realign chain to fit datalen bytes of |
| 1924 | data in it. */ |
| 1925 | static int |
| 1926 | evbuffer_chain_should_realign(struct evbuffer_chain *chain, |
| 1927 | size_t datlen) |
| 1928 | { |
| 1929 | return chain->buffer_len - chain->off >= datlen && |
| 1930 | (chain->off < chain->buffer_len / 2) && |
| 1931 | (chain->off <= MAX_TO_REALIGN_IN_EXPAND); |
| 1932 | } |
| 1933 | |
| 1934 | /* Expands the available space in the event buffer to at least datlen, all in |
| 1935 | * a single chunk. Return that chunk. */ |
| 1936 | static struct evbuffer_chain * |
| 1937 | evbuffer_expand_singlechain(struct evbuffer *buf, size_t datlen) |
| 1938 | { |
| 1939 | struct evbuffer_chain *chain, **chainp; |
| 1940 | struct evbuffer_chain *result = NULL; |
| 1941 | ASSERT_EVBUFFER_LOCKED(buf); |
| 1942 | |
| 1943 | chainp = buf->last_with_datap; |
| 1944 | |
| 1945 | /* XXX If *chainp is no longer writeable, but has enough space in its |
| 1946 | * misalign, this might be a bad idea: we could still use *chainp, not |
| 1947 | * (*chainp)->next. */ |
| 1948 | if (*chainp && CHAIN_SPACE_LEN(*chainp) == 0) |
| 1949 | chainp = &(*chainp)->next; |
| 1950 | |
| 1951 | /* 'chain' now points to the first chain with writable space (if any) |
| 1952 | * We will either use it, realign it, replace it, or resize it. */ |
| 1953 | chain = *chainp; |
| 1954 | |
| 1955 | if (chain == NULL || |
| 1956 | (chain->flags & (EVBUFFER_IMMUTABLE|EVBUFFER_MEM_PINNED_ANY))) { |
| 1957 | /* We can't use the last_with_data chain at all. Just add a |
| 1958 | * new one that's big enough. */ |
| 1959 | goto insert_new; |
| 1960 | } |
| 1961 | |
| 1962 | /* If we can fit all the data, then we don't have to do anything */ |
| 1963 | if (CHAIN_SPACE_LEN(chain) >= datlen) { |
| 1964 | result = chain; |
| 1965 | goto ok; |
| 1966 | } |
| 1967 | |
| 1968 | /* If the chain is completely empty, just replace it by adding a new |
| 1969 | * empty chain. */ |
| 1970 | if (chain->off == 0) { |
| 1971 | goto insert_new; |
| 1972 | } |
| 1973 | |
| 1974 | /* If the misalignment plus the remaining space fulfills our data |
| 1975 | * needs, we could just force an alignment to happen. Afterwards, we |
| 1976 | * have enough space. But only do this if we're saving a lot of space |
| 1977 | * and not moving too much data. Otherwise the space savings are |
| 1978 | * probably offset by the time lost in copying. |
| 1979 | */ |
| 1980 | if (evbuffer_chain_should_realign(chain, datlen)) { |
| 1981 | evbuffer_chain_align(chain); |
| 1982 | result = chain; |
| 1983 | goto ok; |
| 1984 | } |
| 1985 | |
| 1986 | /* At this point, we can either resize the last chunk with space in |
| 1987 | * it, use the next chunk after it, or If we add a new chunk, we waste |
| 1988 | * CHAIN_SPACE_LEN(chain) bytes in the former last chunk. If we |
| 1989 | * resize, we have to copy chain->off bytes. |
| 1990 | */ |
| 1991 | |
| 1992 | /* Would expanding this chunk be affordable and worthwhile? */ |
| 1993 | if (CHAIN_SPACE_LEN(chain) < chain->buffer_len / 8 || |
| 1994 | chain->off > MAX_TO_COPY_IN_EXPAND || |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1995 | datlen >= (EVBUFFER_CHAIN_MAX - chain->off)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1996 | /* It's not worth resizing this chain. Can the next one be |
| 1997 | * used? */ |
| 1998 | if (chain->next && CHAIN_SPACE_LEN(chain->next) >= datlen) { |
| 1999 | /* Yes, we can just use the next chain (which should |
| 2000 | * be empty. */ |
| 2001 | result = chain->next; |
| 2002 | goto ok; |
| 2003 | } else { |
| 2004 | /* No; append a new chain (which will free all |
| 2005 | * terminal empty chains.) */ |
| 2006 | goto insert_new; |
| 2007 | } |
| 2008 | } else { |
| 2009 | /* Okay, we're going to try to resize this chain: Not doing so |
| 2010 | * would waste at least 1/8 of its current allocation, and we |
| 2011 | * can do so without having to copy more than |
| 2012 | * MAX_TO_COPY_IN_EXPAND bytes. */ |
| 2013 | /* figure out how much space we need */ |
| 2014 | size_t length = chain->off + datlen; |
| 2015 | struct evbuffer_chain *tmp = evbuffer_chain_new(length); |
| 2016 | if (tmp == NULL) |
| 2017 | goto err; |
| 2018 | |
| 2019 | /* copy the data over that we had so far */ |
| 2020 | tmp->off = chain->off; |
| 2021 | memcpy(tmp->buffer, chain->buffer + chain->misalign, |
| 2022 | chain->off); |
| 2023 | /* fix up the list */ |
| 2024 | EVUTIL_ASSERT(*chainp == chain); |
| 2025 | result = *chainp = tmp; |
| 2026 | |
| 2027 | if (buf->last == chain) |
| 2028 | buf->last = tmp; |
| 2029 | |
| 2030 | tmp->next = chain->next; |
| 2031 | evbuffer_chain_free(chain); |
| 2032 | goto ok; |
| 2033 | } |
| 2034 | |
| 2035 | insert_new: |
| 2036 | result = evbuffer_chain_insert_new(buf, datlen); |
| 2037 | if (!result) |
| 2038 | goto err; |
| 2039 | ok: |
| 2040 | EVUTIL_ASSERT(result); |
| 2041 | EVUTIL_ASSERT(CHAIN_SPACE_LEN(result) >= datlen); |
| 2042 | err: |
| 2043 | return result; |
| 2044 | } |
| 2045 | |
| 2046 | /* Make sure that datlen bytes are available for writing in the last n |
| 2047 | * chains. Never copies or moves data. */ |
| 2048 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2049 | evbuffer_expand_fast_(struct evbuffer *buf, size_t datlen, int n) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2050 | { |
| 2051 | struct evbuffer_chain *chain = buf->last, *tmp, *next; |
| 2052 | size_t avail; |
| 2053 | int used; |
| 2054 | |
| 2055 | ASSERT_EVBUFFER_LOCKED(buf); |
| 2056 | EVUTIL_ASSERT(n >= 2); |
| 2057 | |
| 2058 | if (chain == NULL || (chain->flags & EVBUFFER_IMMUTABLE)) { |
| 2059 | /* There is no last chunk, or we can't touch the last chunk. |
| 2060 | * Just add a new chunk. */ |
| 2061 | chain = evbuffer_chain_new(datlen); |
| 2062 | if (chain == NULL) |
| 2063 | return (-1); |
| 2064 | |
| 2065 | evbuffer_chain_insert(buf, chain); |
| 2066 | return (0); |
| 2067 | } |
| 2068 | |
| 2069 | used = 0; /* number of chains we're using space in. */ |
| 2070 | avail = 0; /* how much space they have. */ |
| 2071 | /* How many bytes can we stick at the end of buffer as it is? Iterate |
| 2072 | * over the chains at the end of the buffer, tring to see how much |
| 2073 | * space we have in the first n. */ |
| 2074 | for (chain = *buf->last_with_datap; chain; chain = chain->next) { |
| 2075 | if (chain->off) { |
| 2076 | size_t space = (size_t) CHAIN_SPACE_LEN(chain); |
| 2077 | EVUTIL_ASSERT(chain == *buf->last_with_datap); |
| 2078 | if (space) { |
| 2079 | avail += space; |
| 2080 | ++used; |
| 2081 | } |
| 2082 | } else { |
| 2083 | /* No data in chain; realign it. */ |
| 2084 | chain->misalign = 0; |
| 2085 | avail += chain->buffer_len; |
| 2086 | ++used; |
| 2087 | } |
| 2088 | if (avail >= datlen) { |
| 2089 | /* There is already enough space. Just return */ |
| 2090 | return (0); |
| 2091 | } |
| 2092 | if (used == n) |
| 2093 | break; |
| 2094 | } |
| 2095 | |
| 2096 | /* There wasn't enough space in the first n chains with space in |
| 2097 | * them. Either add a new chain with enough space, or replace all |
| 2098 | * empty chains with one that has enough space, depending on n. */ |
| 2099 | if (used < n) { |
| 2100 | /* The loop ran off the end of the chains before it hit n |
| 2101 | * chains; we can add another. */ |
| 2102 | EVUTIL_ASSERT(chain == NULL); |
| 2103 | |
| 2104 | tmp = evbuffer_chain_new(datlen - avail); |
| 2105 | if (tmp == NULL) |
| 2106 | return (-1); |
| 2107 | |
| 2108 | buf->last->next = tmp; |
| 2109 | buf->last = tmp; |
| 2110 | /* (we would only set last_with_data if we added the first |
| 2111 | * chain. But if the buffer had no chains, we would have |
| 2112 | * just allocated a new chain earlier) */ |
| 2113 | return (0); |
| 2114 | } else { |
| 2115 | /* Nuke _all_ the empty chains. */ |
| 2116 | int rmv_all = 0; /* True iff we removed last_with_data. */ |
| 2117 | chain = *buf->last_with_datap; |
| 2118 | if (!chain->off) { |
| 2119 | EVUTIL_ASSERT(chain == buf->first); |
| 2120 | rmv_all = 1; |
| 2121 | avail = 0; |
| 2122 | } else { |
| 2123 | /* can't overflow, since only mutable chains have |
| 2124 | * huge misaligns. */ |
| 2125 | avail = (size_t) CHAIN_SPACE_LEN(chain); |
| 2126 | chain = chain->next; |
| 2127 | } |
| 2128 | |
| 2129 | |
| 2130 | for (; chain; chain = next) { |
| 2131 | next = chain->next; |
| 2132 | EVUTIL_ASSERT(chain->off == 0); |
| 2133 | evbuffer_chain_free(chain); |
| 2134 | } |
| 2135 | EVUTIL_ASSERT(datlen >= avail); |
| 2136 | tmp = evbuffer_chain_new(datlen - avail); |
| 2137 | if (tmp == NULL) { |
| 2138 | if (rmv_all) { |
| 2139 | ZERO_CHAIN(buf); |
| 2140 | } else { |
| 2141 | buf->last = *buf->last_with_datap; |
| 2142 | (*buf->last_with_datap)->next = NULL; |
| 2143 | } |
| 2144 | return (-1); |
| 2145 | } |
| 2146 | |
| 2147 | if (rmv_all) { |
| 2148 | buf->first = buf->last = tmp; |
| 2149 | buf->last_with_datap = &buf->first; |
| 2150 | } else { |
| 2151 | (*buf->last_with_datap)->next = tmp; |
| 2152 | buf->last = tmp; |
| 2153 | } |
| 2154 | return (0); |
| 2155 | } |
| 2156 | } |
| 2157 | |
| 2158 | int |
| 2159 | evbuffer_expand(struct evbuffer *buf, size_t datlen) |
| 2160 | { |
| 2161 | struct evbuffer_chain *chain; |
| 2162 | |
| 2163 | EVBUFFER_LOCK(buf); |
| 2164 | chain = evbuffer_expand_singlechain(buf, datlen); |
| 2165 | EVBUFFER_UNLOCK(buf); |
| 2166 | return chain ? 0 : -1; |
| 2167 | } |
| 2168 | |
| 2169 | /* |
| 2170 | * Reads data from a file descriptor into a buffer. |
| 2171 | */ |
| 2172 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2173 | #if defined(EVENT__HAVE_SYS_UIO_H) || defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2174 | #define USE_IOVEC_IMPL |
| 2175 | #endif |
| 2176 | |
| 2177 | #ifdef USE_IOVEC_IMPL |
| 2178 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2179 | #ifdef EVENT__HAVE_SYS_UIO_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2180 | /* number of iovec we use for writev, fragmentation is going to determine |
| 2181 | * how much we end up writing */ |
| 2182 | |
| 2183 | #define DEFAULT_WRITE_IOVEC 128 |
| 2184 | |
| 2185 | #if defined(UIO_MAXIOV) && UIO_MAXIOV < DEFAULT_WRITE_IOVEC |
| 2186 | #define NUM_WRITE_IOVEC UIO_MAXIOV |
| 2187 | #elif defined(IOV_MAX) && IOV_MAX < DEFAULT_WRITE_IOVEC |
| 2188 | #define NUM_WRITE_IOVEC IOV_MAX |
| 2189 | #else |
| 2190 | #define NUM_WRITE_IOVEC DEFAULT_WRITE_IOVEC |
| 2191 | #endif |
| 2192 | |
| 2193 | #define IOV_TYPE struct iovec |
| 2194 | #define IOV_PTR_FIELD iov_base |
| 2195 | #define IOV_LEN_FIELD iov_len |
| 2196 | #define IOV_LEN_TYPE size_t |
| 2197 | #else |
| 2198 | #define NUM_WRITE_IOVEC 16 |
| 2199 | #define IOV_TYPE WSABUF |
| 2200 | #define IOV_PTR_FIELD buf |
| 2201 | #define IOV_LEN_FIELD len |
| 2202 | #define IOV_LEN_TYPE unsigned long |
| 2203 | #endif |
| 2204 | #endif |
| 2205 | #define NUM_READ_IOVEC 4 |
| 2206 | |
| 2207 | #define EVBUFFER_MAX_READ 4096 |
| 2208 | |
| 2209 | /** Helper function to figure out which space to use for reading data into |
| 2210 | an evbuffer. Internal use only. |
| 2211 | |
| 2212 | @param buf The buffer to read into |
| 2213 | @param howmuch How much we want to read. |
| 2214 | @param vecs An array of two or more iovecs or WSABUFs. |
| 2215 | @param n_vecs_avail The length of vecs |
| 2216 | @param chainp A pointer to a variable to hold the first chain we're |
| 2217 | reading into. |
| 2218 | @param exact Boolean: if true, we do not provide more than 'howmuch' |
| 2219 | space in the vectors, even if more space is available. |
| 2220 | @return The number of buffers we're using. |
| 2221 | */ |
| 2222 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2223 | evbuffer_read_setup_vecs_(struct evbuffer *buf, ev_ssize_t howmuch, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2224 | struct evbuffer_iovec *vecs, int n_vecs_avail, |
| 2225 | struct evbuffer_chain ***chainp, int exact) |
| 2226 | { |
| 2227 | struct evbuffer_chain *chain; |
| 2228 | struct evbuffer_chain **firstchainp; |
| 2229 | size_t so_far; |
| 2230 | int i; |
| 2231 | ASSERT_EVBUFFER_LOCKED(buf); |
| 2232 | |
| 2233 | if (howmuch < 0) |
| 2234 | return -1; |
| 2235 | |
| 2236 | so_far = 0; |
| 2237 | /* Let firstchain be the first chain with any space on it */ |
| 2238 | firstchainp = buf->last_with_datap; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 2239 | EVUTIL_ASSERT(*firstchainp); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2240 | if (CHAIN_SPACE_LEN(*firstchainp) == 0) { |
| 2241 | firstchainp = &(*firstchainp)->next; |
| 2242 | } |
| 2243 | |
| 2244 | chain = *firstchainp; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 2245 | EVUTIL_ASSERT(chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2246 | for (i = 0; i < n_vecs_avail && so_far < (size_t)howmuch; ++i) { |
| 2247 | size_t avail = (size_t) CHAIN_SPACE_LEN(chain); |
| 2248 | if (avail > (howmuch - so_far) && exact) |
| 2249 | avail = howmuch - so_far; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2250 | vecs[i].iov_base = (void *)CHAIN_SPACE_PTR(chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2251 | vecs[i].iov_len = avail; |
| 2252 | so_far += avail; |
| 2253 | chain = chain->next; |
| 2254 | } |
| 2255 | |
| 2256 | *chainp = firstchainp; |
| 2257 | return i; |
| 2258 | } |
| 2259 | |
| 2260 | static int |
| 2261 | get_n_bytes_readable_on_socket(evutil_socket_t fd) |
| 2262 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2263 | #if defined(FIONREAD) && defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2264 | unsigned long lng = EVBUFFER_MAX_READ; |
| 2265 | if (ioctlsocket(fd, FIONREAD, &lng) < 0) |
| 2266 | return -1; |
| 2267 | /* Can overflow, but mostly harmlessly. XXXX */ |
| 2268 | return (int)lng; |
| 2269 | #elif defined(FIONREAD) |
| 2270 | int n = EVBUFFER_MAX_READ; |
| 2271 | if (ioctl(fd, FIONREAD, &n) < 0) |
| 2272 | return -1; |
| 2273 | return n; |
| 2274 | #else |
| 2275 | return EVBUFFER_MAX_READ; |
| 2276 | #endif |
| 2277 | } |
| 2278 | |
| 2279 | /* TODO(niels): should this function return ev_ssize_t and take ev_ssize_t |
| 2280 | * as howmuch? */ |
| 2281 | int |
| 2282 | evbuffer_read(struct evbuffer *buf, evutil_socket_t fd, int howmuch) |
| 2283 | { |
| 2284 | struct evbuffer_chain **chainp; |
| 2285 | int n; |
| 2286 | int result; |
| 2287 | |
| 2288 | #ifdef USE_IOVEC_IMPL |
| 2289 | int nvecs, i, remaining; |
| 2290 | #else |
| 2291 | struct evbuffer_chain *chain; |
| 2292 | unsigned char *p; |
| 2293 | #endif |
| 2294 | |
| 2295 | EVBUFFER_LOCK(buf); |
| 2296 | |
| 2297 | if (buf->freeze_end) { |
| 2298 | result = -1; |
| 2299 | goto done; |
| 2300 | } |
| 2301 | |
| 2302 | n = get_n_bytes_readable_on_socket(fd); |
| 2303 | if (n <= 0 || n > EVBUFFER_MAX_READ) |
| 2304 | n = EVBUFFER_MAX_READ; |
| 2305 | if (howmuch < 0 || howmuch > n) |
| 2306 | howmuch = n; |
| 2307 | |
| 2308 | #ifdef USE_IOVEC_IMPL |
| 2309 | /* Since we can use iovecs, we're willing to use the last |
| 2310 | * NUM_READ_IOVEC chains. */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2311 | if (evbuffer_expand_fast_(buf, howmuch, NUM_READ_IOVEC) == -1) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2312 | result = -1; |
| 2313 | goto done; |
| 2314 | } else { |
| 2315 | IOV_TYPE vecs[NUM_READ_IOVEC]; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2316 | #ifdef EVBUFFER_IOVEC_IS_NATIVE_ |
| 2317 | nvecs = evbuffer_read_setup_vecs_(buf, howmuch, vecs, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2318 | NUM_READ_IOVEC, &chainp, 1); |
| 2319 | #else |
| 2320 | /* We aren't using the native struct iovec. Therefore, |
| 2321 | we are on win32. */ |
| 2322 | struct evbuffer_iovec ev_vecs[NUM_READ_IOVEC]; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2323 | nvecs = evbuffer_read_setup_vecs_(buf, howmuch, ev_vecs, 2, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2324 | &chainp, 1); |
| 2325 | |
| 2326 | for (i=0; i < nvecs; ++i) |
| 2327 | WSABUF_FROM_EVBUFFER_IOV(&vecs[i], &ev_vecs[i]); |
| 2328 | #endif |
| 2329 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2330 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2331 | { |
| 2332 | DWORD bytesRead; |
| 2333 | DWORD flags=0; |
| 2334 | if (WSARecv(fd, vecs, nvecs, &bytesRead, &flags, NULL, NULL)) { |
| 2335 | /* The read failed. It might be a close, |
| 2336 | * or it might be an error. */ |
| 2337 | if (WSAGetLastError() == WSAECONNABORTED) |
| 2338 | n = 0; |
| 2339 | else |
| 2340 | n = -1; |
| 2341 | } else |
| 2342 | n = bytesRead; |
| 2343 | } |
| 2344 | #else |
| 2345 | n = readv(fd, vecs, nvecs); |
| 2346 | #endif |
| 2347 | } |
| 2348 | |
| 2349 | #else /*!USE_IOVEC_IMPL*/ |
| 2350 | /* If we don't have FIONREAD, we might waste some space here */ |
| 2351 | /* XXX we _will_ waste some space here if there is any space left |
| 2352 | * over on buf->last. */ |
| 2353 | if ((chain = evbuffer_expand_singlechain(buf, howmuch)) == NULL) { |
| 2354 | result = -1; |
| 2355 | goto done; |
| 2356 | } |
| 2357 | |
| 2358 | /* We can append new data at this point */ |
| 2359 | p = chain->buffer + chain->misalign + chain->off; |
| 2360 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2361 | #ifndef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2362 | n = read(fd, p, howmuch); |
| 2363 | #else |
| 2364 | n = recv(fd, p, howmuch, 0); |
| 2365 | #endif |
| 2366 | #endif /* USE_IOVEC_IMPL */ |
| 2367 | |
| 2368 | if (n == -1) { |
| 2369 | result = -1; |
| 2370 | goto done; |
| 2371 | } |
| 2372 | if (n == 0) { |
| 2373 | result = 0; |
| 2374 | goto done; |
| 2375 | } |
| 2376 | |
| 2377 | #ifdef USE_IOVEC_IMPL |
| 2378 | remaining = n; |
| 2379 | for (i=0; i < nvecs; ++i) { |
| 2380 | /* can't overflow, since only mutable chains have |
| 2381 | * huge misaligns. */ |
| 2382 | size_t space = (size_t) CHAIN_SPACE_LEN(*chainp); |
| 2383 | /* XXXX This is a kludge that can waste space in perverse |
| 2384 | * situations. */ |
| 2385 | if (space > EVBUFFER_CHAIN_MAX) |
| 2386 | space = EVBUFFER_CHAIN_MAX; |
| 2387 | if ((ev_ssize_t)space < remaining) { |
| 2388 | (*chainp)->off += space; |
| 2389 | remaining -= (int)space; |
| 2390 | } else { |
| 2391 | (*chainp)->off += remaining; |
| 2392 | buf->last_with_datap = chainp; |
| 2393 | break; |
| 2394 | } |
| 2395 | chainp = &(*chainp)->next; |
| 2396 | } |
| 2397 | #else |
| 2398 | chain->off += n; |
| 2399 | advance_last_with_data(buf); |
| 2400 | #endif |
| 2401 | buf->total_len += n; |
| 2402 | buf->n_add_for_cb += n; |
| 2403 | |
| 2404 | /* Tell someone about changes in this buffer */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2405 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2406 | result = n; |
| 2407 | done: |
| 2408 | EVBUFFER_UNLOCK(buf); |
| 2409 | return result; |
| 2410 | } |
| 2411 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2412 | #ifdef USE_IOVEC_IMPL |
| 2413 | static inline int |
| 2414 | evbuffer_write_iovec(struct evbuffer *buffer, evutil_socket_t fd, |
| 2415 | ev_ssize_t howmuch) |
| 2416 | { |
| 2417 | IOV_TYPE iov[NUM_WRITE_IOVEC]; |
| 2418 | struct evbuffer_chain *chain = buffer->first; |
| 2419 | int n, i = 0; |
| 2420 | |
| 2421 | if (howmuch < 0) |
| 2422 | return -1; |
| 2423 | |
| 2424 | ASSERT_EVBUFFER_LOCKED(buffer); |
| 2425 | /* XXX make this top out at some maximal data length? if the |
| 2426 | * buffer has (say) 1MB in it, split over 128 chains, there's |
| 2427 | * no way it all gets written in one go. */ |
| 2428 | while (chain != NULL && i < NUM_WRITE_IOVEC && howmuch) { |
| 2429 | #ifdef USE_SENDFILE |
| 2430 | /* we cannot write the file info via writev */ |
| 2431 | if (chain->flags & EVBUFFER_SENDFILE) |
| 2432 | break; |
| 2433 | #endif |
| 2434 | iov[i].IOV_PTR_FIELD = (void *) (chain->buffer + chain->misalign); |
| 2435 | if ((size_t)howmuch >= chain->off) { |
| 2436 | /* XXXcould be problematic when windows supports mmap*/ |
| 2437 | iov[i++].IOV_LEN_FIELD = (IOV_LEN_TYPE)chain->off; |
| 2438 | howmuch -= chain->off; |
| 2439 | } else { |
| 2440 | /* XXXcould be problematic when windows supports mmap*/ |
| 2441 | iov[i++].IOV_LEN_FIELD = (IOV_LEN_TYPE)howmuch; |
| 2442 | break; |
| 2443 | } |
| 2444 | chain = chain->next; |
| 2445 | } |
| 2446 | if (! i) |
| 2447 | return 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2448 | |
| 2449 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2450 | { |
| 2451 | DWORD bytesSent; |
| 2452 | if (WSASend(fd, iov, i, &bytesSent, 0, NULL, NULL)) |
| 2453 | n = -1; |
| 2454 | else |
| 2455 | n = bytesSent; |
| 2456 | } |
| 2457 | #else |
| 2458 | n = writev(fd, iov, i); |
| 2459 | #endif |
| 2460 | return (n); |
| 2461 | } |
| 2462 | #endif |
| 2463 | |
| 2464 | #ifdef USE_SENDFILE |
| 2465 | static inline int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2466 | evbuffer_write_sendfile(struct evbuffer *buffer, evutil_socket_t dest_fd, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2467 | ev_ssize_t howmuch) |
| 2468 | { |
| 2469 | struct evbuffer_chain *chain = buffer->first; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2470 | struct evbuffer_chain_file_segment *info = |
| 2471 | EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_file_segment, |
| 2472 | chain); |
| 2473 | const int source_fd = info->segment->fd; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2474 | #if defined(SENDFILE_IS_MACOSX) || defined(SENDFILE_IS_FREEBSD) |
| 2475 | int res; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2476 | ev_off_t len = chain->off; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2477 | #elif defined(SENDFILE_IS_LINUX) || defined(SENDFILE_IS_SOLARIS) |
| 2478 | ev_ssize_t res; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 2479 | off_t offset = chain->misalign; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2480 | #endif |
| 2481 | |
| 2482 | ASSERT_EVBUFFER_LOCKED(buffer); |
| 2483 | |
| 2484 | #if defined(SENDFILE_IS_MACOSX) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2485 | res = sendfile(source_fd, dest_fd, chain->misalign, &len, NULL, 0); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2486 | if (res == -1 && !EVUTIL_ERR_RW_RETRIABLE(errno)) |
| 2487 | return (-1); |
| 2488 | |
| 2489 | return (len); |
| 2490 | #elif defined(SENDFILE_IS_FREEBSD) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2491 | res = sendfile(source_fd, dest_fd, chain->misalign, chain->off, NULL, &len, 0); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2492 | if (res == -1 && !EVUTIL_ERR_RW_RETRIABLE(errno)) |
| 2493 | return (-1); |
| 2494 | |
| 2495 | return (len); |
| 2496 | #elif defined(SENDFILE_IS_LINUX) |
| 2497 | /* TODO(niels): implement splice */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2498 | res = sendfile(dest_fd, source_fd, &offset, chain->off); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2499 | if (res == -1 && EVUTIL_ERR_RW_RETRIABLE(errno)) { |
| 2500 | /* if this is EAGAIN or EINTR return 0; otherwise, -1 */ |
| 2501 | return (0); |
| 2502 | } |
| 2503 | return (res); |
| 2504 | #elif defined(SENDFILE_IS_SOLARIS) |
| 2505 | { |
| 2506 | const off_t offset_orig = offset; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2507 | res = sendfile(dest_fd, source_fd, &offset, chain->off); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2508 | if (res == -1 && EVUTIL_ERR_RW_RETRIABLE(errno)) { |
| 2509 | if (offset - offset_orig) |
| 2510 | return offset - offset_orig; |
| 2511 | /* if this is EAGAIN or EINTR and no bytes were |
| 2512 | * written, return 0 */ |
| 2513 | return (0); |
| 2514 | } |
| 2515 | return (res); |
| 2516 | } |
| 2517 | #endif |
| 2518 | } |
| 2519 | #endif |
| 2520 | |
| 2521 | int |
| 2522 | evbuffer_write_atmost(struct evbuffer *buffer, evutil_socket_t fd, |
| 2523 | ev_ssize_t howmuch) |
| 2524 | { |
| 2525 | int n = -1; |
| 2526 | |
| 2527 | EVBUFFER_LOCK(buffer); |
| 2528 | |
| 2529 | if (buffer->freeze_start) { |
| 2530 | goto done; |
| 2531 | } |
| 2532 | |
| 2533 | if (howmuch < 0 || (size_t)howmuch > buffer->total_len) |
| 2534 | howmuch = buffer->total_len; |
| 2535 | |
| 2536 | if (howmuch > 0) { |
| 2537 | #ifdef USE_SENDFILE |
| 2538 | struct evbuffer_chain *chain = buffer->first; |
| 2539 | if (chain != NULL && (chain->flags & EVBUFFER_SENDFILE)) |
| 2540 | n = evbuffer_write_sendfile(buffer, fd, howmuch); |
| 2541 | else { |
| 2542 | #endif |
| 2543 | #ifdef USE_IOVEC_IMPL |
| 2544 | n = evbuffer_write_iovec(buffer, fd, howmuch); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2545 | #elif defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2546 | /* XXX(nickm) Don't disable this code until we know if |
| 2547 | * the WSARecv code above works. */ |
| 2548 | void *p = evbuffer_pullup(buffer, howmuch); |
| 2549 | EVUTIL_ASSERT(p || !howmuch); |
| 2550 | n = send(fd, p, howmuch, 0); |
| 2551 | #else |
| 2552 | void *p = evbuffer_pullup(buffer, howmuch); |
| 2553 | EVUTIL_ASSERT(p || !howmuch); |
| 2554 | n = write(fd, p, howmuch); |
| 2555 | #endif |
| 2556 | #ifdef USE_SENDFILE |
| 2557 | } |
| 2558 | #endif |
| 2559 | } |
| 2560 | |
| 2561 | if (n > 0) |
| 2562 | evbuffer_drain(buffer, n); |
| 2563 | |
| 2564 | done: |
| 2565 | EVBUFFER_UNLOCK(buffer); |
| 2566 | return (n); |
| 2567 | } |
| 2568 | |
| 2569 | int |
| 2570 | evbuffer_write(struct evbuffer *buffer, evutil_socket_t fd) |
| 2571 | { |
| 2572 | return evbuffer_write_atmost(buffer, fd, -1); |
| 2573 | } |
| 2574 | |
| 2575 | unsigned char * |
| 2576 | evbuffer_find(struct evbuffer *buffer, const unsigned char *what, size_t len) |
| 2577 | { |
| 2578 | unsigned char *search; |
| 2579 | struct evbuffer_ptr ptr; |
| 2580 | |
| 2581 | EVBUFFER_LOCK(buffer); |
| 2582 | |
| 2583 | ptr = evbuffer_search(buffer, (const char *)what, len, NULL); |
| 2584 | if (ptr.pos < 0) { |
| 2585 | search = NULL; |
| 2586 | } else { |
| 2587 | search = evbuffer_pullup(buffer, ptr.pos + len); |
| 2588 | if (search) |
| 2589 | search += ptr.pos; |
| 2590 | } |
| 2591 | EVBUFFER_UNLOCK(buffer); |
| 2592 | return search; |
| 2593 | } |
| 2594 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2595 | /* Subract <b>howfar</b> from the position of <b>pos</b> within |
| 2596 | * <b>buf</b>. Returns 0 on success, -1 on failure. |
| 2597 | * |
| 2598 | * This isn't exposed yet, because of potential inefficiency issues. |
| 2599 | * Maybe it should be. */ |
| 2600 | static int |
| 2601 | evbuffer_ptr_subtract(struct evbuffer *buf, struct evbuffer_ptr *pos, |
| 2602 | size_t howfar) |
| 2603 | { |
| 2604 | if (pos->pos < 0) |
| 2605 | return -1; |
| 2606 | if (howfar > (size_t)pos->pos) |
| 2607 | return -1; |
| 2608 | if (pos->internal_.chain && howfar <= pos->internal_.pos_in_chain) { |
| 2609 | pos->internal_.pos_in_chain -= howfar; |
| 2610 | pos->pos -= howfar; |
| 2611 | return 0; |
| 2612 | } else { |
| 2613 | const size_t newpos = pos->pos - howfar; |
| 2614 | /* Here's the inefficient part: it walks over the |
| 2615 | * chains until we hit newpos. */ |
| 2616 | return evbuffer_ptr_set(buf, pos, newpos, EVBUFFER_PTR_SET); |
| 2617 | } |
| 2618 | } |
| 2619 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2620 | int |
| 2621 | evbuffer_ptr_set(struct evbuffer *buf, struct evbuffer_ptr *pos, |
| 2622 | size_t position, enum evbuffer_ptr_how how) |
| 2623 | { |
| 2624 | size_t left = position; |
| 2625 | struct evbuffer_chain *chain = NULL; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2626 | int result = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2627 | |
| 2628 | EVBUFFER_LOCK(buf); |
| 2629 | |
| 2630 | switch (how) { |
| 2631 | case EVBUFFER_PTR_SET: |
| 2632 | chain = buf->first; |
| 2633 | pos->pos = position; |
| 2634 | position = 0; |
| 2635 | break; |
| 2636 | case EVBUFFER_PTR_ADD: |
| 2637 | /* this avoids iterating over all previous chains if |
| 2638 | we just want to advance the position */ |
| 2639 | if (pos->pos < 0 || EV_SIZE_MAX - position < (size_t)pos->pos) { |
| 2640 | EVBUFFER_UNLOCK(buf); |
| 2641 | return -1; |
| 2642 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2643 | chain = pos->internal_.chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2644 | pos->pos += position; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2645 | position = pos->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2646 | break; |
| 2647 | } |
| 2648 | |
| 2649 | EVUTIL_ASSERT(EV_SIZE_MAX - left >= position); |
| 2650 | while (chain && position + left >= chain->off) { |
| 2651 | left -= chain->off - position; |
| 2652 | chain = chain->next; |
| 2653 | position = 0; |
| 2654 | } |
| 2655 | if (chain) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2656 | pos->internal_.chain = chain; |
| 2657 | pos->internal_.pos_in_chain = position + left; |
| 2658 | } else if (left == 0) { |
| 2659 | /* The first byte in the (nonexistent) chain after the last chain */ |
| 2660 | pos->internal_.chain = NULL; |
| 2661 | pos->internal_.pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2662 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2663 | PTR_NOT_FOUND(pos); |
| 2664 | result = -1; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2665 | } |
| 2666 | |
| 2667 | EVBUFFER_UNLOCK(buf); |
| 2668 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2669 | return result; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2670 | } |
| 2671 | |
| 2672 | /** |
| 2673 | Compare the bytes in buf at position pos to the len bytes in mem. Return |
| 2674 | less than 0, 0, or greater than 0 as memcmp. |
| 2675 | */ |
| 2676 | static int |
| 2677 | evbuffer_ptr_memcmp(const struct evbuffer *buf, const struct evbuffer_ptr *pos, |
| 2678 | const char *mem, size_t len) |
| 2679 | { |
| 2680 | struct evbuffer_chain *chain; |
| 2681 | size_t position; |
| 2682 | int r; |
| 2683 | |
| 2684 | ASSERT_EVBUFFER_LOCKED(buf); |
| 2685 | |
| 2686 | if (pos->pos < 0 || |
| 2687 | EV_SIZE_MAX - len < (size_t)pos->pos || |
| 2688 | pos->pos + len > buf->total_len) |
| 2689 | return -1; |
| 2690 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2691 | chain = pos->internal_.chain; |
| 2692 | position = pos->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2693 | while (len && chain) { |
| 2694 | size_t n_comparable; |
| 2695 | if (len + position > chain->off) |
| 2696 | n_comparable = chain->off - position; |
| 2697 | else |
| 2698 | n_comparable = len; |
| 2699 | r = memcmp(chain->buffer + chain->misalign + position, mem, |
| 2700 | n_comparable); |
| 2701 | if (r) |
| 2702 | return r; |
| 2703 | mem += n_comparable; |
| 2704 | len -= n_comparable; |
| 2705 | position = 0; |
| 2706 | chain = chain->next; |
| 2707 | } |
| 2708 | |
| 2709 | return 0; |
| 2710 | } |
| 2711 | |
| 2712 | struct evbuffer_ptr |
| 2713 | evbuffer_search(struct evbuffer *buffer, const char *what, size_t len, const struct evbuffer_ptr *start) |
| 2714 | { |
| 2715 | return evbuffer_search_range(buffer, what, len, start, NULL); |
| 2716 | } |
| 2717 | |
| 2718 | struct evbuffer_ptr |
| 2719 | evbuffer_search_range(struct evbuffer *buffer, const char *what, size_t len, const struct evbuffer_ptr *start, const struct evbuffer_ptr *end) |
| 2720 | { |
| 2721 | struct evbuffer_ptr pos; |
| 2722 | struct evbuffer_chain *chain, *last_chain = NULL; |
| 2723 | const unsigned char *p; |
| 2724 | char first; |
| 2725 | |
| 2726 | EVBUFFER_LOCK(buffer); |
| 2727 | |
| 2728 | if (start) { |
| 2729 | memcpy(&pos, start, sizeof(pos)); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2730 | chain = pos.internal_.chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2731 | } else { |
| 2732 | pos.pos = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2733 | chain = pos.internal_.chain = buffer->first; |
| 2734 | pos.internal_.pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2735 | } |
| 2736 | |
| 2737 | if (end) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2738 | last_chain = end->internal_.chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2739 | |
| 2740 | if (!len || len > EV_SSIZE_MAX) |
| 2741 | goto done; |
| 2742 | |
| 2743 | first = what[0]; |
| 2744 | |
| 2745 | while (chain) { |
| 2746 | const unsigned char *start_at = |
| 2747 | chain->buffer + chain->misalign + |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2748 | pos.internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2749 | p = memchr(start_at, first, |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2750 | chain->off - pos.internal_.pos_in_chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2751 | if (p) { |
| 2752 | pos.pos += p - start_at; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2753 | pos.internal_.pos_in_chain += p - start_at; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2754 | if (!evbuffer_ptr_memcmp(buffer, &pos, what, len)) { |
| 2755 | if (end && pos.pos + (ev_ssize_t)len > end->pos) |
| 2756 | goto not_found; |
| 2757 | else |
| 2758 | goto done; |
| 2759 | } |
| 2760 | ++pos.pos; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2761 | ++pos.internal_.pos_in_chain; |
| 2762 | if (pos.internal_.pos_in_chain == chain->off) { |
| 2763 | chain = pos.internal_.chain = chain->next; |
| 2764 | pos.internal_.pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2765 | } |
| 2766 | } else { |
| 2767 | if (chain == last_chain) |
| 2768 | goto not_found; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2769 | pos.pos += chain->off - pos.internal_.pos_in_chain; |
| 2770 | chain = pos.internal_.chain = chain->next; |
| 2771 | pos.internal_.pos_in_chain = 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2772 | } |
| 2773 | } |
| 2774 | |
| 2775 | not_found: |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2776 | PTR_NOT_FOUND(&pos); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2777 | done: |
| 2778 | EVBUFFER_UNLOCK(buffer); |
| 2779 | return pos; |
| 2780 | } |
| 2781 | |
| 2782 | int |
| 2783 | evbuffer_peek(struct evbuffer *buffer, ev_ssize_t len, |
| 2784 | struct evbuffer_ptr *start_at, |
| 2785 | struct evbuffer_iovec *vec, int n_vec) |
| 2786 | { |
| 2787 | struct evbuffer_chain *chain; |
| 2788 | int idx = 0; |
| 2789 | ev_ssize_t len_so_far = 0; |
| 2790 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2791 | /* Avoid locking in trivial edge cases */ |
| 2792 | if (start_at && start_at->internal_.chain == NULL) |
| 2793 | return 0; |
| 2794 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2795 | EVBUFFER_LOCK(buffer); |
| 2796 | |
| 2797 | if (start_at) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2798 | chain = start_at->internal_.chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2799 | len_so_far = chain->off |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2800 | - start_at->internal_.pos_in_chain; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2801 | idx = 1; |
| 2802 | if (n_vec > 0) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2803 | vec[0].iov_base = (void *)(chain->buffer + chain->misalign |
| 2804 | + start_at->internal_.pos_in_chain); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2805 | vec[0].iov_len = len_so_far; |
| 2806 | } |
| 2807 | chain = chain->next; |
| 2808 | } else { |
| 2809 | chain = buffer->first; |
| 2810 | } |
| 2811 | |
| 2812 | if (n_vec == 0 && len < 0) { |
| 2813 | /* If no vectors are provided and they asked for "everything", |
| 2814 | * pretend they asked for the actual available amount. */ |
| 2815 | len = buffer->total_len; |
| 2816 | if (start_at) { |
| 2817 | len -= start_at->pos; |
| 2818 | } |
| 2819 | } |
| 2820 | |
| 2821 | while (chain) { |
| 2822 | if (len >= 0 && len_so_far >= len) |
| 2823 | break; |
| 2824 | if (idx<n_vec) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2825 | vec[idx].iov_base = (void *)(chain->buffer + chain->misalign); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2826 | vec[idx].iov_len = chain->off; |
| 2827 | } else if (len<0) { |
| 2828 | break; |
| 2829 | } |
| 2830 | ++idx; |
| 2831 | len_so_far += chain->off; |
| 2832 | chain = chain->next; |
| 2833 | } |
| 2834 | |
| 2835 | EVBUFFER_UNLOCK(buffer); |
| 2836 | |
| 2837 | return idx; |
| 2838 | } |
| 2839 | |
| 2840 | |
| 2841 | int |
| 2842 | evbuffer_add_vprintf(struct evbuffer *buf, const char *fmt, va_list ap) |
| 2843 | { |
| 2844 | char *buffer; |
| 2845 | size_t space; |
| 2846 | int sz, result = -1; |
| 2847 | va_list aq; |
| 2848 | struct evbuffer_chain *chain; |
| 2849 | |
| 2850 | |
| 2851 | EVBUFFER_LOCK(buf); |
| 2852 | |
| 2853 | if (buf->freeze_end) { |
| 2854 | goto done; |
| 2855 | } |
| 2856 | |
| 2857 | /* make sure that at least some space is available */ |
| 2858 | if ((chain = evbuffer_expand_singlechain(buf, 64)) == NULL) |
| 2859 | goto done; |
| 2860 | |
| 2861 | for (;;) { |
| 2862 | #if 0 |
| 2863 | size_t used = chain->misalign + chain->off; |
| 2864 | buffer = (char *)chain->buffer + chain->misalign + chain->off; |
| 2865 | EVUTIL_ASSERT(chain->buffer_len >= used); |
| 2866 | space = chain->buffer_len - used; |
| 2867 | #endif |
| 2868 | buffer = (char*) CHAIN_SPACE_PTR(chain); |
| 2869 | space = (size_t) CHAIN_SPACE_LEN(chain); |
| 2870 | |
| 2871 | #ifndef va_copy |
| 2872 | #define va_copy(dst, src) memcpy(&(dst), &(src), sizeof(va_list)) |
| 2873 | #endif |
| 2874 | va_copy(aq, ap); |
| 2875 | |
| 2876 | sz = evutil_vsnprintf(buffer, space, fmt, aq); |
| 2877 | |
| 2878 | va_end(aq); |
| 2879 | |
| 2880 | if (sz < 0) |
| 2881 | goto done; |
| 2882 | if (INT_MAX >= EVBUFFER_CHAIN_MAX && |
| 2883 | (size_t)sz >= EVBUFFER_CHAIN_MAX) |
| 2884 | goto done; |
| 2885 | if ((size_t)sz < space) { |
| 2886 | chain->off += sz; |
| 2887 | buf->total_len += sz; |
| 2888 | buf->n_add_for_cb += sz; |
| 2889 | |
| 2890 | advance_last_with_data(buf); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2891 | evbuffer_invoke_callbacks_(buf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2892 | result = sz; |
| 2893 | goto done; |
| 2894 | } |
| 2895 | if ((chain = evbuffer_expand_singlechain(buf, sz + 1)) == NULL) |
| 2896 | goto done; |
| 2897 | } |
| 2898 | /* NOTREACHED */ |
| 2899 | |
| 2900 | done: |
| 2901 | EVBUFFER_UNLOCK(buf); |
| 2902 | return result; |
| 2903 | } |
| 2904 | |
| 2905 | int |
| 2906 | evbuffer_add_printf(struct evbuffer *buf, const char *fmt, ...) |
| 2907 | { |
| 2908 | int res = -1; |
| 2909 | va_list ap; |
| 2910 | |
| 2911 | va_start(ap, fmt); |
| 2912 | res = evbuffer_add_vprintf(buf, fmt, ap); |
| 2913 | va_end(ap); |
| 2914 | |
| 2915 | return (res); |
| 2916 | } |
| 2917 | |
| 2918 | int |
| 2919 | evbuffer_add_reference(struct evbuffer *outbuf, |
| 2920 | const void *data, size_t datlen, |
| 2921 | evbuffer_ref_cleanup_cb cleanupfn, void *extra) |
| 2922 | { |
| 2923 | struct evbuffer_chain *chain; |
| 2924 | struct evbuffer_chain_reference *info; |
| 2925 | int result = -1; |
| 2926 | |
| 2927 | chain = evbuffer_chain_new(sizeof(struct evbuffer_chain_reference)); |
| 2928 | if (!chain) |
| 2929 | return (-1); |
| 2930 | chain->flags |= EVBUFFER_REFERENCE | EVBUFFER_IMMUTABLE; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2931 | chain->buffer = (unsigned char *)data; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2932 | chain->buffer_len = datlen; |
| 2933 | chain->off = datlen; |
| 2934 | |
| 2935 | info = EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_reference, chain); |
| 2936 | info->cleanupfn = cleanupfn; |
| 2937 | info->extra = extra; |
| 2938 | |
| 2939 | EVBUFFER_LOCK(outbuf); |
| 2940 | if (outbuf->freeze_end) { |
| 2941 | /* don't call chain_free; we do not want to actually invoke |
| 2942 | * the cleanup function */ |
| 2943 | mm_free(chain); |
| 2944 | goto done; |
| 2945 | } |
| 2946 | evbuffer_chain_insert(outbuf, chain); |
| 2947 | outbuf->n_add_for_cb += datlen; |
| 2948 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2949 | evbuffer_invoke_callbacks_(outbuf); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2950 | |
| 2951 | result = 0; |
| 2952 | done: |
| 2953 | EVBUFFER_UNLOCK(outbuf); |
| 2954 | |
| 2955 | return result; |
| 2956 | } |
| 2957 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2958 | /* TODO(niels): we may want to add to automagically convert to mmap, in |
| 2959 | * case evbuffer_remove() or evbuffer_pullup() are being used. |
| 2960 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2961 | struct evbuffer_file_segment * |
| 2962 | evbuffer_file_segment_new( |
| 2963 | int fd, ev_off_t offset, ev_off_t length, unsigned flags) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2964 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2965 | struct evbuffer_file_segment *seg = |
| 2966 | mm_calloc(sizeof(struct evbuffer_file_segment), 1); |
| 2967 | if (!seg) |
| 2968 | return NULL; |
| 2969 | seg->refcnt = 1; |
| 2970 | seg->fd = fd; |
| 2971 | seg->flags = flags; |
| 2972 | seg->file_offset = offset; |
| 2973 | seg->cleanup_cb = NULL; |
| 2974 | seg->cleanup_cb_arg = NULL; |
| 2975 | #ifdef _WIN32 |
| 2976 | #ifndef lseek |
| 2977 | #define lseek _lseeki64 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2978 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2979 | #ifndef fstat |
| 2980 | #define fstat _fstat |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2981 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2982 | #ifndef stat |
| 2983 | #define stat _stat |
| 2984 | #endif |
| 2985 | #endif |
| 2986 | if (length == -1) { |
| 2987 | struct stat st; |
| 2988 | if (fstat(fd, &st) < 0) |
| 2989 | goto err; |
| 2990 | length = st.st_size; |
| 2991 | } |
| 2992 | seg->length = length; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2993 | |
| 2994 | if (offset < 0 || length < 0 || |
| 2995 | ((ev_uint64_t)length > EVBUFFER_CHAIN_MAX) || |
| 2996 | (ev_uint64_t)offset > (ev_uint64_t)(EVBUFFER_CHAIN_MAX - length)) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2997 | goto err; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2998 | |
| 2999 | #if defined(USE_SENDFILE) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3000 | if (!(flags & EVBUF_FS_DISABLE_SENDFILE)) { |
| 3001 | seg->can_sendfile = 1; |
| 3002 | goto done; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3003 | } |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 3004 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3005 | |
| 3006 | if (evbuffer_file_segment_materialize(seg)<0) |
| 3007 | goto err; |
| 3008 | |
| 3009 | #if defined(USE_SENDFILE) |
| 3010 | done: |
| 3011 | #endif |
| 3012 | if (!(flags & EVBUF_FS_DISABLE_LOCKING)) { |
| 3013 | EVTHREAD_ALLOC_LOCK(seg->lock, 0); |
| 3014 | } |
| 3015 | return seg; |
| 3016 | err: |
| 3017 | mm_free(seg); |
| 3018 | return NULL; |
| 3019 | } |
| 3020 | |
| 3021 | #ifdef EVENT__HAVE_MMAP |
| 3022 | static long |
| 3023 | get_page_size(void) |
| 3024 | { |
| 3025 | #ifdef SC_PAGE_SIZE |
| 3026 | return sysconf(SC_PAGE_SIZE); |
| 3027 | #elif defined(_SC_PAGE_SIZE) |
| 3028 | return sysconf(_SC_PAGE_SIZE); |
| 3029 | #else |
| 3030 | return 1; |
| 3031 | #endif |
| 3032 | } |
| 3033 | #endif |
| 3034 | |
| 3035 | /* DOCDOC */ |
| 3036 | /* Requires lock */ |
| 3037 | static int |
| 3038 | evbuffer_file_segment_materialize(struct evbuffer_file_segment *seg) |
| 3039 | { |
| 3040 | const unsigned flags = seg->flags; |
| 3041 | const int fd = seg->fd; |
| 3042 | const ev_off_t length = seg->length; |
| 3043 | const ev_off_t offset = seg->file_offset; |
| 3044 | |
| 3045 | if (seg->contents) |
| 3046 | return 0; /* already materialized */ |
| 3047 | |
| 3048 | #if defined(EVENT__HAVE_MMAP) |
| 3049 | if (!(flags & EVBUF_FS_DISABLE_MMAP)) { |
| 3050 | off_t offset_rounded = 0, offset_leftover = 0; |
| 3051 | void *mapped; |
| 3052 | if (offset) { |
| 3053 | /* mmap implementations don't generally like us |
| 3054 | * to have an offset that isn't a round */ |
| 3055 | long page_size = get_page_size(); |
| 3056 | if (page_size == -1) |
| 3057 | goto err; |
| 3058 | offset_leftover = offset % page_size; |
| 3059 | offset_rounded = offset - offset_leftover; |
| 3060 | } |
| 3061 | mapped = mmap(NULL, length + offset_leftover, |
| 3062 | PROT_READ, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3063 | #ifdef MAP_NOCACHE |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3064 | MAP_NOCACHE | /* ??? */ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3065 | #endif |
| 3066 | #ifdef MAP_FILE |
| 3067 | MAP_FILE | |
| 3068 | #endif |
| 3069 | MAP_PRIVATE, |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3070 | fd, offset_rounded); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3071 | if (mapped == MAP_FAILED) { |
| 3072 | event_warn("%s: mmap(%d, %d, %zu) failed", |
| 3073 | __func__, fd, 0, (size_t)(offset + length)); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3074 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3075 | seg->mapping = mapped; |
| 3076 | seg->contents = (char*)mapped+offset_leftover; |
| 3077 | seg->mmap_offset = 0; |
| 3078 | seg->is_mapping = 1; |
| 3079 | goto done; |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 3080 | } |
Elliott Hughes | 2a572d1 | 2017-08-07 14:18:18 -0700 | [diff] [blame] | 3081 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3082 | #endif |
| 3083 | #ifdef _WIN32 |
| 3084 | if (!(flags & EVBUF_FS_DISABLE_MMAP)) { |
| 3085 | intptr_t h = _get_osfhandle(fd); |
| 3086 | HANDLE m; |
| 3087 | ev_uint64_t total_size = length+offset; |
| 3088 | if ((HANDLE)h == INVALID_HANDLE_VALUE) |
| 3089 | goto err; |
| 3090 | m = CreateFileMapping((HANDLE)h, NULL, PAGE_READONLY, |
| 3091 | (total_size >> 32), total_size & 0xfffffffful, |
| 3092 | NULL); |
| 3093 | if (m != INVALID_HANDLE_VALUE) { /* Does h leak? */ |
| 3094 | seg->mapping_handle = m; |
| 3095 | seg->mmap_offset = offset; |
| 3096 | seg->is_mapping = 1; |
| 3097 | goto done; |
| 3098 | } |
| 3099 | } |
| 3100 | #endif |
| 3101 | { |
| 3102 | ev_off_t start_pos = lseek(fd, 0, SEEK_CUR), pos; |
| 3103 | ev_off_t read_so_far = 0; |
| 3104 | char *mem; |
| 3105 | int e; |
| 3106 | ev_ssize_t n = 0; |
| 3107 | if (!(mem = mm_malloc(length))) |
| 3108 | goto err; |
| 3109 | if (start_pos < 0) { |
| 3110 | mm_free(mem); |
| 3111 | goto err; |
| 3112 | } |
| 3113 | if (lseek(fd, offset, SEEK_SET) < 0) { |
| 3114 | mm_free(mem); |
| 3115 | goto err; |
| 3116 | } |
| 3117 | while (read_so_far < length) { |
| 3118 | n = read(fd, mem+read_so_far, length-read_so_far); |
| 3119 | if (n <= 0) |
| 3120 | break; |
| 3121 | read_so_far += n; |
| 3122 | } |
Elliott Hughes | 2a572d1 | 2017-08-07 14:18:18 -0700 | [diff] [blame] | 3123 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3124 | e = errno; |
| 3125 | pos = lseek(fd, start_pos, SEEK_SET); |
| 3126 | if (n < 0 || (n == 0 && length > read_so_far)) { |
| 3127 | mm_free(mem); |
| 3128 | errno = e; |
| 3129 | goto err; |
| 3130 | } else if (pos < 0) { |
| 3131 | mm_free(mem); |
| 3132 | goto err; |
| 3133 | } |
Elliott Hughes | 2a572d1 | 2017-08-07 14:18:18 -0700 | [diff] [blame] | 3134 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3135 | seg->contents = mem; |
| 3136 | } |
| 3137 | |
| 3138 | done: |
| 3139 | return 0; |
| 3140 | err: |
| 3141 | return -1; |
Elliott Hughes | 2a572d1 | 2017-08-07 14:18:18 -0700 | [diff] [blame] | 3142 | } |
| 3143 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3144 | void evbuffer_file_segment_add_cleanup_cb(struct evbuffer_file_segment *seg, |
| 3145 | evbuffer_file_segment_cleanup_cb cb, void* arg) |
| 3146 | { |
| 3147 | EVUTIL_ASSERT(seg->refcnt > 0); |
| 3148 | seg->cleanup_cb = cb; |
| 3149 | seg->cleanup_cb_arg = arg; |
| 3150 | } |
| 3151 | |
| 3152 | void |
| 3153 | evbuffer_file_segment_free(struct evbuffer_file_segment *seg) |
| 3154 | { |
| 3155 | int refcnt; |
| 3156 | EVLOCK_LOCK(seg->lock, 0); |
| 3157 | refcnt = --seg->refcnt; |
| 3158 | EVLOCK_UNLOCK(seg->lock, 0); |
| 3159 | if (refcnt > 0) |
| 3160 | return; |
| 3161 | EVUTIL_ASSERT(refcnt == 0); |
| 3162 | |
| 3163 | if (seg->is_mapping) { |
| 3164 | #ifdef _WIN32 |
| 3165 | CloseHandle(seg->mapping_handle); |
| 3166 | #elif defined (EVENT__HAVE_MMAP) |
| 3167 | off_t offset_leftover; |
| 3168 | offset_leftover = seg->file_offset % get_page_size(); |
| 3169 | if (munmap(seg->mapping, seg->length + offset_leftover) == -1) |
| 3170 | event_warn("%s: munmap failed", __func__); |
| 3171 | #endif |
| 3172 | } else if (seg->contents) { |
| 3173 | mm_free(seg->contents); |
| 3174 | } |
| 3175 | |
| 3176 | if ((seg->flags & EVBUF_FS_CLOSE_ON_FREE) && seg->fd >= 0) { |
| 3177 | close(seg->fd); |
| 3178 | } |
| 3179 | |
| 3180 | if (seg->cleanup_cb) { |
| 3181 | (*seg->cleanup_cb)((struct evbuffer_file_segment const*)seg, |
| 3182 | seg->flags, seg->cleanup_cb_arg); |
| 3183 | seg->cleanup_cb = NULL; |
| 3184 | seg->cleanup_cb_arg = NULL; |
| 3185 | } |
| 3186 | |
| 3187 | EVTHREAD_FREE_LOCK(seg->lock, 0); |
| 3188 | mm_free(seg); |
| 3189 | } |
| 3190 | |
| 3191 | int |
| 3192 | evbuffer_add_file_segment(struct evbuffer *buf, |
| 3193 | struct evbuffer_file_segment *seg, ev_off_t offset, ev_off_t length) |
| 3194 | { |
| 3195 | struct evbuffer_chain *chain; |
| 3196 | struct evbuffer_chain_file_segment *extra; |
| 3197 | int can_use_sendfile = 0; |
| 3198 | |
| 3199 | EVBUFFER_LOCK(buf); |
| 3200 | EVLOCK_LOCK(seg->lock, 0); |
| 3201 | if (buf->flags & EVBUFFER_FLAG_DRAINS_TO_FD) { |
| 3202 | can_use_sendfile = 1; |
| 3203 | } else { |
| 3204 | if (!seg->contents) { |
| 3205 | if (evbuffer_file_segment_materialize(seg)<0) { |
| 3206 | EVLOCK_UNLOCK(seg->lock, 0); |
| 3207 | EVBUFFER_UNLOCK(buf); |
| 3208 | return -1; |
| 3209 | } |
| 3210 | } |
| 3211 | } |
| 3212 | ++seg->refcnt; |
| 3213 | EVLOCK_UNLOCK(seg->lock, 0); |
| 3214 | |
| 3215 | if (buf->freeze_end) |
| 3216 | goto err; |
| 3217 | |
| 3218 | if (length < 0) { |
| 3219 | if (offset > seg->length) |
| 3220 | goto err; |
| 3221 | length = seg->length - offset; |
| 3222 | } |
| 3223 | |
| 3224 | /* Can we actually add this? */ |
| 3225 | if (offset+length > seg->length) |
| 3226 | goto err; |
| 3227 | |
| 3228 | chain = evbuffer_chain_new(sizeof(struct evbuffer_chain_file_segment)); |
| 3229 | if (!chain) |
| 3230 | goto err; |
| 3231 | extra = EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_file_segment, chain); |
| 3232 | |
| 3233 | chain->flags |= EVBUFFER_IMMUTABLE|EVBUFFER_FILESEGMENT; |
| 3234 | if (can_use_sendfile && seg->can_sendfile) { |
| 3235 | chain->flags |= EVBUFFER_SENDFILE; |
| 3236 | chain->misalign = seg->file_offset + offset; |
| 3237 | chain->off = length; |
| 3238 | chain->buffer_len = chain->misalign + length; |
| 3239 | } else if (seg->is_mapping) { |
| 3240 | #ifdef _WIN32 |
| 3241 | ev_uint64_t total_offset = seg->mmap_offset+offset; |
| 3242 | ev_uint64_t offset_rounded=0, offset_remaining=0; |
| 3243 | LPVOID data; |
| 3244 | if (total_offset) { |
| 3245 | SYSTEM_INFO si; |
| 3246 | memset(&si, 0, sizeof(si)); /* cargo cult */ |
| 3247 | GetSystemInfo(&si); |
| 3248 | offset_remaining = total_offset % si.dwAllocationGranularity; |
| 3249 | offset_rounded = total_offset - offset_remaining; |
| 3250 | } |
| 3251 | data = MapViewOfFile( |
| 3252 | seg->mapping_handle, |
| 3253 | FILE_MAP_READ, |
| 3254 | offset_rounded >> 32, |
| 3255 | offset_rounded & 0xfffffffful, |
| 3256 | length + offset_remaining); |
| 3257 | if (data == NULL) { |
| 3258 | mm_free(chain); |
| 3259 | goto err; |
| 3260 | } |
| 3261 | chain->buffer = (unsigned char*) data; |
| 3262 | chain->buffer_len = length+offset_remaining; |
| 3263 | chain->misalign = offset_remaining; |
| 3264 | chain->off = length; |
| 3265 | #else |
| 3266 | chain->buffer = (unsigned char*)(seg->contents + offset); |
| 3267 | chain->buffer_len = length; |
| 3268 | chain->off = length; |
| 3269 | #endif |
| 3270 | } else { |
| 3271 | chain->buffer = (unsigned char*)(seg->contents + offset); |
| 3272 | chain->buffer_len = length; |
| 3273 | chain->off = length; |
| 3274 | } |
| 3275 | |
| 3276 | extra->segment = seg; |
| 3277 | buf->n_add_for_cb += length; |
| 3278 | evbuffer_chain_insert(buf, chain); |
| 3279 | |
| 3280 | evbuffer_invoke_callbacks_(buf); |
| 3281 | |
| 3282 | EVBUFFER_UNLOCK(buf); |
| 3283 | |
| 3284 | return 0; |
| 3285 | err: |
| 3286 | EVBUFFER_UNLOCK(buf); |
| 3287 | evbuffer_file_segment_free(seg); /* Lowers the refcount */ |
| 3288 | return -1; |
| 3289 | } |
| 3290 | |
| 3291 | int |
| 3292 | evbuffer_add_file(struct evbuffer *buf, int fd, ev_off_t offset, ev_off_t length) |
| 3293 | { |
| 3294 | struct evbuffer_file_segment *seg; |
| 3295 | unsigned flags = EVBUF_FS_CLOSE_ON_FREE; |
| 3296 | int r; |
| 3297 | |
| 3298 | seg = evbuffer_file_segment_new(fd, offset, length, flags); |
| 3299 | if (!seg) |
| 3300 | return -1; |
| 3301 | r = evbuffer_add_file_segment(buf, seg, 0, length); |
| 3302 | if (r == 0) |
| 3303 | evbuffer_file_segment_free(seg); |
| 3304 | return r; |
| 3305 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3306 | |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 3307 | int |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3308 | evbuffer_setcb(struct evbuffer *buffer, evbuffer_cb cb, void *cbarg) |
| 3309 | { |
| 3310 | EVBUFFER_LOCK(buffer); |
| 3311 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3312 | if (!LIST_EMPTY(&buffer->callbacks)) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3313 | evbuffer_remove_all_callbacks(buffer); |
| 3314 | |
| 3315 | if (cb) { |
| 3316 | struct evbuffer_cb_entry *ent = |
| 3317 | evbuffer_add_cb(buffer, NULL, cbarg); |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 3318 | if (!ent) { |
| 3319 | EVBUFFER_UNLOCK(buffer); |
| 3320 | return -1; |
| 3321 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3322 | ent->cb.cb_obsolete = cb; |
| 3323 | ent->flags |= EVBUFFER_CB_OBSOLETE; |
| 3324 | } |
| 3325 | EVBUFFER_UNLOCK(buffer); |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 3326 | return 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3327 | } |
| 3328 | |
| 3329 | struct evbuffer_cb_entry * |
| 3330 | evbuffer_add_cb(struct evbuffer *buffer, evbuffer_cb_func cb, void *cbarg) |
| 3331 | { |
| 3332 | struct evbuffer_cb_entry *e; |
| 3333 | if (! (e = mm_calloc(1, sizeof(struct evbuffer_cb_entry)))) |
| 3334 | return NULL; |
| 3335 | EVBUFFER_LOCK(buffer); |
| 3336 | e->cb.cb_func = cb; |
| 3337 | e->cbarg = cbarg; |
| 3338 | e->flags = EVBUFFER_CB_ENABLED; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3339 | LIST_INSERT_HEAD(&buffer->callbacks, e, next); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3340 | EVBUFFER_UNLOCK(buffer); |
| 3341 | return e; |
| 3342 | } |
| 3343 | |
| 3344 | int |
| 3345 | evbuffer_remove_cb_entry(struct evbuffer *buffer, |
| 3346 | struct evbuffer_cb_entry *ent) |
| 3347 | { |
| 3348 | EVBUFFER_LOCK(buffer); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3349 | LIST_REMOVE(ent, next); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3350 | EVBUFFER_UNLOCK(buffer); |
| 3351 | mm_free(ent); |
| 3352 | return 0; |
| 3353 | } |
| 3354 | |
| 3355 | int |
| 3356 | evbuffer_remove_cb(struct evbuffer *buffer, evbuffer_cb_func cb, void *cbarg) |
| 3357 | { |
| 3358 | struct evbuffer_cb_entry *cbent; |
| 3359 | int result = -1; |
| 3360 | EVBUFFER_LOCK(buffer); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3361 | LIST_FOREACH(cbent, &buffer->callbacks, next) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3362 | if (cb == cbent->cb.cb_func && cbarg == cbent->cbarg) { |
| 3363 | result = evbuffer_remove_cb_entry(buffer, cbent); |
| 3364 | goto done; |
| 3365 | } |
| 3366 | } |
| 3367 | done: |
| 3368 | EVBUFFER_UNLOCK(buffer); |
| 3369 | return result; |
| 3370 | } |
| 3371 | |
| 3372 | int |
| 3373 | evbuffer_cb_set_flags(struct evbuffer *buffer, |
| 3374 | struct evbuffer_cb_entry *cb, ev_uint32_t flags) |
| 3375 | { |
| 3376 | /* the user isn't allowed to mess with these. */ |
| 3377 | flags &= ~EVBUFFER_CB_INTERNAL_FLAGS; |
| 3378 | EVBUFFER_LOCK(buffer); |
| 3379 | cb->flags |= flags; |
| 3380 | EVBUFFER_UNLOCK(buffer); |
| 3381 | return 0; |
| 3382 | } |
| 3383 | |
| 3384 | int |
| 3385 | evbuffer_cb_clear_flags(struct evbuffer *buffer, |
| 3386 | struct evbuffer_cb_entry *cb, ev_uint32_t flags) |
| 3387 | { |
| 3388 | /* the user isn't allowed to mess with these. */ |
| 3389 | flags &= ~EVBUFFER_CB_INTERNAL_FLAGS; |
| 3390 | EVBUFFER_LOCK(buffer); |
| 3391 | cb->flags &= ~flags; |
| 3392 | EVBUFFER_UNLOCK(buffer); |
| 3393 | return 0; |
| 3394 | } |
| 3395 | |
| 3396 | int |
| 3397 | evbuffer_freeze(struct evbuffer *buffer, int start) |
| 3398 | { |
| 3399 | EVBUFFER_LOCK(buffer); |
| 3400 | if (start) |
| 3401 | buffer->freeze_start = 1; |
| 3402 | else |
| 3403 | buffer->freeze_end = 1; |
| 3404 | EVBUFFER_UNLOCK(buffer); |
| 3405 | return 0; |
| 3406 | } |
| 3407 | |
| 3408 | int |
| 3409 | evbuffer_unfreeze(struct evbuffer *buffer, int start) |
| 3410 | { |
| 3411 | EVBUFFER_LOCK(buffer); |
| 3412 | if (start) |
| 3413 | buffer->freeze_start = 0; |
| 3414 | else |
| 3415 | buffer->freeze_end = 0; |
| 3416 | EVBUFFER_UNLOCK(buffer); |
| 3417 | return 0; |
| 3418 | } |
| 3419 | |
| 3420 | #if 0 |
| 3421 | void |
| 3422 | evbuffer_cb_suspend(struct evbuffer *buffer, struct evbuffer_cb_entry *cb) |
| 3423 | { |
| 3424 | if (!(cb->flags & EVBUFFER_CB_SUSPENDED)) { |
| 3425 | cb->size_before_suspend = evbuffer_get_length(buffer); |
| 3426 | cb->flags |= EVBUFFER_CB_SUSPENDED; |
| 3427 | } |
| 3428 | } |
| 3429 | |
| 3430 | void |
| 3431 | evbuffer_cb_unsuspend(struct evbuffer *buffer, struct evbuffer_cb_entry *cb) |
| 3432 | { |
| 3433 | if ((cb->flags & EVBUFFER_CB_SUSPENDED)) { |
| 3434 | unsigned call = (cb->flags & EVBUFFER_CB_CALL_ON_UNSUSPEND); |
| 3435 | size_t sz = cb->size_before_suspend; |
| 3436 | cb->flags &= ~(EVBUFFER_CB_SUSPENDED| |
| 3437 | EVBUFFER_CB_CALL_ON_UNSUSPEND); |
| 3438 | cb->size_before_suspend = 0; |
| 3439 | if (call && (cb->flags & EVBUFFER_CB_ENABLED)) { |
| 3440 | cb->cb(buffer, sz, evbuffer_get_length(buffer), cb->cbarg); |
| 3441 | } |
| 3442 | } |
| 3443 | } |
| 3444 | #endif |
| 3445 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3446 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3447 | evbuffer_get_callbacks_(struct evbuffer *buffer, struct event_callback **cbs, |
| 3448 | int max_cbs) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3449 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 3450 | int r = 0; |
| 3451 | EVBUFFER_LOCK(buffer); |
| 3452 | if (buffer->deferred_cbs) { |
| 3453 | if (max_cbs < 1) { |
| 3454 | r = -1; |
| 3455 | goto done; |
| 3456 | } |
| 3457 | cbs[0] = &buffer->deferred; |
| 3458 | r = 1; |
| 3459 | } |
| 3460 | done: |
| 3461 | EVBUFFER_UNLOCK(buffer); |
| 3462 | return r; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 3463 | } |