Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * 3. The name of the author may not be used to endorse or promote products |
| 13 | * derived from this software without specific prior written permission. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include "event2/event-config.h" |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 28 | #include "evconfig-private.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 29 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 30 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 31 | #include <winsock2.h> |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 32 | #include <winerror.h> |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 33 | #include <ws2tcpip.h> |
| 34 | #define WIN32_LEAN_AND_MEAN |
| 35 | #include <windows.h> |
| 36 | #undef WIN32_LEAN_AND_MEAN |
| 37 | #include <io.h> |
| 38 | #include <tchar.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 39 | #include <process.h> |
| 40 | #undef _WIN32_WINNT |
| 41 | /* For structs needed by GetAdaptersAddresses */ |
| 42 | #define _WIN32_WINNT 0x0501 |
| 43 | #include <iphlpapi.h> |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 44 | #endif |
| 45 | |
| 46 | #include <sys/types.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 47 | #ifdef EVENT__HAVE_SYS_SOCKET_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 48 | #include <sys/socket.h> |
| 49 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 50 | #ifdef EVENT__HAVE_UNISTD_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 51 | #include <unistd.h> |
| 52 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 53 | #ifdef EVENT__HAVE_FCNTL_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 54 | #include <fcntl.h> |
| 55 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 56 | #ifdef EVENT__HAVE_STDLIB_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 57 | #include <stdlib.h> |
| 58 | #endif |
| 59 | #include <errno.h> |
| 60 | #include <limits.h> |
| 61 | #include <stdio.h> |
| 62 | #include <string.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 63 | #ifdef EVENT__HAVE_NETINET_IN_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 64 | #include <netinet/in.h> |
| 65 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 66 | #ifdef EVENT__HAVE_NETINET_IN6_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 67 | #include <netinet/in6.h> |
| 68 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 69 | #ifdef EVENT__HAVE_NETINET_TCP_H |
| 70 | #include <netinet/tcp.h> |
| 71 | #endif |
| 72 | #ifdef EVENT__HAVE_ARPA_INET_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 73 | #include <arpa/inet.h> |
| 74 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 75 | #include <time.h> |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 76 | #include <sys/stat.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 77 | #ifdef EVENT__HAVE_IFADDRS_H |
| 78 | #include <ifaddrs.h> |
| 79 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 80 | |
| 81 | #include "event2/util.h" |
| 82 | #include "util-internal.h" |
| 83 | #include "log-internal.h" |
| 84 | #include "mm-internal.h" |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 85 | #include "evthread-internal.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 86 | |
| 87 | #include "strlcpy-internal.h" |
| 88 | #include "ipv6-internal.h" |
| 89 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 90 | #ifdef _WIN32 |
| 91 | #define HT_NO_CACHE_HASH_VALUES |
| 92 | #include "ht-internal.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 93 | #define open _open |
| 94 | #define read _read |
| 95 | #define close _close |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 96 | #ifndef fstat |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 97 | #define fstat _fstati64 |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 98 | #endif |
| 99 | #ifndef stat |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 100 | #define stat _stati64 |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 101 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 102 | #define mode_t int |
| 103 | #endif |
| 104 | |
| 105 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 106 | evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 107 | { |
| 108 | int fd; |
| 109 | |
| 110 | #ifdef O_CLOEXEC |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 111 | fd = open(pathname, flags|O_CLOEXEC, (mode_t)mode); |
| 112 | if (fd >= 0 || errno == EINVAL) |
| 113 | return fd; |
| 114 | /* If we got an EINVAL, fall through and try without O_CLOEXEC */ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 115 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 116 | fd = open(pathname, flags, (mode_t)mode); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 117 | if (fd < 0) |
| 118 | return -1; |
| 119 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 120 | #if defined(FD_CLOEXEC) |
| 121 | if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) { |
| 122 | close(fd); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 123 | return -1; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 124 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 125 | #endif |
| 126 | |
| 127 | return fd; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | Read the contents of 'filename' into a newly allocated NUL-terminated |
| 132 | string. Set *content_out to hold this string, and *len_out to hold its |
| 133 | length (not including the appended NUL). If 'is_binary', open the file in |
| 134 | binary mode. |
| 135 | |
| 136 | Returns 0 on success, -1 if the open fails, and -2 for all other failures. |
| 137 | |
| 138 | Used internally only; may go away in a future version. |
| 139 | */ |
| 140 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 141 | evutil_read_file_(const char *filename, char **content_out, size_t *len_out, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 142 | int is_binary) |
| 143 | { |
| 144 | int fd, r; |
| 145 | struct stat st; |
| 146 | char *mem; |
| 147 | size_t read_so_far=0; |
| 148 | int mode = O_RDONLY; |
| 149 | |
| 150 | EVUTIL_ASSERT(content_out); |
| 151 | EVUTIL_ASSERT(len_out); |
| 152 | *content_out = NULL; |
| 153 | *len_out = 0; |
| 154 | |
| 155 | #ifdef O_BINARY |
| 156 | if (is_binary) |
| 157 | mode |= O_BINARY; |
| 158 | #endif |
| 159 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 160 | fd = evutil_open_closeonexec_(filename, mode, 0); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 161 | if (fd < 0) |
| 162 | return -1; |
| 163 | if (fstat(fd, &st) || st.st_size < 0 || |
| 164 | st.st_size > EV_SSIZE_MAX-1 ) { |
| 165 | close(fd); |
| 166 | return -2; |
| 167 | } |
| 168 | mem = mm_malloc((size_t)st.st_size + 1); |
| 169 | if (!mem) { |
| 170 | close(fd); |
| 171 | return -2; |
| 172 | } |
| 173 | read_so_far = 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 174 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 175 | #define N_TO_READ(x) ((x) > INT_MAX) ? INT_MAX : ((int)(x)) |
| 176 | #else |
| 177 | #define N_TO_READ(x) (x) |
| 178 | #endif |
| 179 | while ((r = read(fd, mem+read_so_far, N_TO_READ(st.st_size - read_so_far))) > 0) { |
| 180 | read_so_far += r; |
| 181 | if (read_so_far >= (size_t)st.st_size) |
| 182 | break; |
| 183 | EVUTIL_ASSERT(read_so_far < (size_t)st.st_size); |
| 184 | } |
| 185 | close(fd); |
| 186 | if (r < 0) { |
| 187 | mm_free(mem); |
| 188 | return -2; |
| 189 | } |
| 190 | mem[read_so_far] = 0; |
| 191 | |
| 192 | *len_out = read_so_far; |
| 193 | *content_out = mem; |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | int |
| 198 | evutil_socketpair(int family, int type, int protocol, evutil_socket_t fd[2]) |
| 199 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 200 | #ifndef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 201 | return socketpair(family, type, protocol, fd); |
| 202 | #else |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 203 | return evutil_ersatz_socketpair_(family, type, protocol, fd); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 204 | #endif |
| 205 | } |
| 206 | |
| 207 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 208 | evutil_ersatz_socketpair_(int family, int type, int protocol, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 209 | evutil_socket_t fd[2]) |
| 210 | { |
| 211 | /* This code is originally from Tor. Used with permission. */ |
| 212 | |
| 213 | /* This socketpair does not work when localhost is down. So |
| 214 | * it's really not the same thing at all. But it's close enough |
| 215 | * for now, and really, when localhost is down sometimes, we |
| 216 | * have other problems too. |
| 217 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 218 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 219 | #define ERR(e) WSA##e |
| 220 | #else |
| 221 | #define ERR(e) e |
| 222 | #endif |
| 223 | evutil_socket_t listener = -1; |
| 224 | evutil_socket_t connector = -1; |
| 225 | evutil_socket_t acceptor = -1; |
| 226 | struct sockaddr_in listen_addr; |
| 227 | struct sockaddr_in connect_addr; |
| 228 | ev_socklen_t size; |
| 229 | int saved_errno = -1; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 230 | int family_test; |
| 231 | |
| 232 | family_test = family != AF_INET; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 233 | #ifdef AF_UNIX |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 234 | family_test = family_test && (family != AF_UNIX); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 235 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 236 | if (protocol || family_test) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 237 | EVUTIL_SET_SOCKET_ERROR(ERR(EAFNOSUPPORT)); |
| 238 | return -1; |
| 239 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 240 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 241 | if (!fd) { |
| 242 | EVUTIL_SET_SOCKET_ERROR(ERR(EINVAL)); |
| 243 | return -1; |
| 244 | } |
| 245 | |
| 246 | listener = socket(AF_INET, type, 0); |
| 247 | if (listener < 0) |
| 248 | return -1; |
| 249 | memset(&listen_addr, 0, sizeof(listen_addr)); |
| 250 | listen_addr.sin_family = AF_INET; |
| 251 | listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 252 | listen_addr.sin_port = 0; /* kernel chooses port. */ |
| 253 | if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr)) |
| 254 | == -1) |
| 255 | goto tidy_up_and_fail; |
| 256 | if (listen(listener, 1) == -1) |
| 257 | goto tidy_up_and_fail; |
| 258 | |
| 259 | connector = socket(AF_INET, type, 0); |
| 260 | if (connector < 0) |
| 261 | goto tidy_up_and_fail; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 262 | |
| 263 | memset(&connect_addr, 0, sizeof(connect_addr)); |
| 264 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 265 | /* We want to find out the port number to connect to. */ |
| 266 | size = sizeof(connect_addr); |
| 267 | if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1) |
| 268 | goto tidy_up_and_fail; |
| 269 | if (size != sizeof (connect_addr)) |
| 270 | goto abort_tidy_up_and_fail; |
| 271 | if (connect(connector, (struct sockaddr *) &connect_addr, |
| 272 | sizeof(connect_addr)) == -1) |
| 273 | goto tidy_up_and_fail; |
| 274 | |
| 275 | size = sizeof(listen_addr); |
| 276 | acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size); |
| 277 | if (acceptor < 0) |
| 278 | goto tidy_up_and_fail; |
| 279 | if (size != sizeof(listen_addr)) |
| 280 | goto abort_tidy_up_and_fail; |
| 281 | /* Now check we are talking to ourself by matching port and host on the |
| 282 | two sockets. */ |
| 283 | if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1) |
| 284 | goto tidy_up_and_fail; |
| 285 | if (size != sizeof (connect_addr) |
| 286 | || listen_addr.sin_family != connect_addr.sin_family |
| 287 | || listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr |
| 288 | || listen_addr.sin_port != connect_addr.sin_port) |
| 289 | goto abort_tidy_up_and_fail; |
| 290 | evutil_closesocket(listener); |
| 291 | fd[0] = connector; |
| 292 | fd[1] = acceptor; |
| 293 | |
| 294 | return 0; |
| 295 | |
| 296 | abort_tidy_up_and_fail: |
| 297 | saved_errno = ERR(ECONNABORTED); |
| 298 | tidy_up_and_fail: |
| 299 | if (saved_errno < 0) |
| 300 | saved_errno = EVUTIL_SOCKET_ERROR(); |
| 301 | if (listener != -1) |
| 302 | evutil_closesocket(listener); |
| 303 | if (connector != -1) |
| 304 | evutil_closesocket(connector); |
| 305 | if (acceptor != -1) |
| 306 | evutil_closesocket(acceptor); |
| 307 | |
| 308 | EVUTIL_SET_SOCKET_ERROR(saved_errno); |
| 309 | return -1; |
| 310 | #undef ERR |
| 311 | } |
| 312 | |
| 313 | int |
| 314 | evutil_make_socket_nonblocking(evutil_socket_t fd) |
| 315 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 316 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 317 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 318 | unsigned long nonblocking = 1; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 319 | if (ioctlsocket(fd, FIONBIO, &nonblocking) == SOCKET_ERROR) { |
| 320 | event_sock_warn(fd, "fcntl(%d, F_GETFL)", (int)fd); |
| 321 | return -1; |
| 322 | } |
| 323 | } |
| 324 | #else |
| 325 | { |
| 326 | int flags; |
| 327 | if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) { |
| 328 | event_warn("fcntl(%d, F_GETFL)", fd); |
| 329 | return -1; |
| 330 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 331 | if (!(flags & O_NONBLOCK)) { |
| 332 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) { |
| 333 | event_warn("fcntl(%d, F_SETFL)", fd); |
| 334 | return -1; |
| 335 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 336 | } |
| 337 | } |
| 338 | #endif |
| 339 | return 0; |
| 340 | } |
| 341 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 342 | /* Faster version of evutil_make_socket_nonblocking for internal use. |
| 343 | * |
| 344 | * Requires that no F_SETFL flags were previously set on the fd. |
| 345 | */ |
| 346 | static int |
| 347 | evutil_fast_socket_nonblocking(evutil_socket_t fd) |
| 348 | { |
| 349 | #ifdef _WIN32 |
| 350 | return evutil_make_socket_nonblocking(fd); |
| 351 | #else |
| 352 | if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) { |
| 353 | event_warn("fcntl(%d, F_SETFL)", fd); |
| 354 | return -1; |
| 355 | } |
| 356 | return 0; |
| 357 | #endif |
| 358 | } |
| 359 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 360 | int |
| 361 | evutil_make_listen_socket_reuseable(evutil_socket_t sock) |
| 362 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 363 | #if defined(SO_REUSEADDR) && !defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 364 | int one = 1; |
| 365 | /* REUSEADDR on Unix means, "don't hang on to this address after the |
| 366 | * listener is closed." On Windows, though, it means "don't keep other |
| 367 | * processes from binding to this address while we're using it. */ |
| 368 | return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one, |
| 369 | (ev_socklen_t)sizeof(one)); |
| 370 | #else |
| 371 | return 0; |
| 372 | #endif |
| 373 | } |
| 374 | |
| 375 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 376 | evutil_make_listen_socket_reuseable_port(evutil_socket_t sock) |
| 377 | { |
| 378 | #if defined __linux__ && defined(SO_REUSEPORT) |
| 379 | int one = 1; |
| 380 | /* REUSEPORT on Linux 3.9+ means, "Multiple servers (processes or |
| 381 | * threads) can bind to the same port if they each set the option. */ |
| 382 | return setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, (void*) &one, |
| 383 | (ev_socklen_t)sizeof(one)); |
| 384 | #else |
| 385 | return 0; |
| 386 | #endif |
| 387 | } |
| 388 | |
| 389 | int |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 390 | evutil_make_listen_socket_ipv6only(evutil_socket_t sock) |
| 391 | { |
| 392 | #if defined(IPV6_V6ONLY) |
| 393 | int one = 1; |
| 394 | return setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*) &one, |
| 395 | (ev_socklen_t)sizeof(one)); |
| 396 | #endif |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 401 | evutil_make_tcp_listen_socket_deferred(evutil_socket_t sock) |
| 402 | { |
| 403 | #if defined(EVENT__HAVE_NETINET_TCP_H) && defined(TCP_DEFER_ACCEPT) |
| 404 | int one = 1; |
| 405 | |
| 406 | /* TCP_DEFER_ACCEPT tells the kernel to call defer accept() only after data |
| 407 | * has arrived and ready to read */ |
| 408 | return setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &one, |
| 409 | (ev_socklen_t)sizeof(one)); |
| 410 | #endif |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | int |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 415 | evutil_make_socket_closeonexec(evutil_socket_t fd) |
| 416 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 417 | #if !defined(_WIN32) && defined(EVENT__HAVE_SETFD) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 418 | int flags; |
| 419 | if ((flags = fcntl(fd, F_GETFD, NULL)) < 0) { |
| 420 | event_warn("fcntl(%d, F_GETFD)", fd); |
| 421 | return -1; |
| 422 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 423 | if (!(flags & FD_CLOEXEC)) { |
| 424 | if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) { |
| 425 | event_warn("fcntl(%d, F_SETFD)", fd); |
| 426 | return -1; |
| 427 | } |
| 428 | } |
| 429 | #endif |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | /* Faster version of evutil_make_socket_closeonexec for internal use. |
| 434 | * |
| 435 | * Requires that no F_SETFD flags were previously set on the fd. |
| 436 | */ |
| 437 | static int |
| 438 | evutil_fast_socket_closeonexec(evutil_socket_t fd) |
| 439 | { |
| 440 | #if !defined(_WIN32) && defined(EVENT__HAVE_SETFD) |
| 441 | if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 442 | event_warn("fcntl(%d, F_SETFD)", fd); |
| 443 | return -1; |
| 444 | } |
| 445 | #endif |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | int |
| 450 | evutil_closesocket(evutil_socket_t sock) |
| 451 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 452 | #ifndef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 453 | return close(sock); |
| 454 | #else |
| 455 | return closesocket(sock); |
| 456 | #endif |
| 457 | } |
| 458 | |
| 459 | ev_int64_t |
| 460 | evutil_strtoll(const char *s, char **endptr, int base) |
| 461 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 462 | #ifdef EVENT__HAVE_STRTOLL |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 463 | return (ev_int64_t)strtoll(s, endptr, base); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 464 | #elif EVENT__SIZEOF_LONG == 8 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 465 | return (ev_int64_t)strtol(s, endptr, base); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 466 | #elif defined(_WIN32) && defined(_MSC_VER) && _MSC_VER < 1300 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 467 | /* XXXX on old versions of MS APIs, we only support base |
| 468 | * 10. */ |
| 469 | ev_int64_t r; |
| 470 | if (base != 10) |
| 471 | return 0; |
| 472 | r = (ev_int64_t) _atoi64(s); |
| 473 | while (isspace(*s)) |
| 474 | ++s; |
| 475 | if (*s == '-') |
| 476 | ++s; |
| 477 | while (isdigit(*s)) |
| 478 | ++s; |
| 479 | if (endptr) |
| 480 | *endptr = (char*) s; |
| 481 | return r; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 482 | #elif defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 483 | return (ev_int64_t) _strtoi64(s, endptr, base); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 484 | #elif defined(EVENT__SIZEOF_LONG_LONG) && EVENT__SIZEOF_LONG_LONG == 8 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 485 | long long r; |
| 486 | int n; |
| 487 | if (base != 10 && base != 16) |
| 488 | return 0; |
| 489 | if (base == 10) { |
| 490 | n = sscanf(s, "%lld", &r); |
| 491 | } else { |
| 492 | unsigned long long ru=0; |
| 493 | n = sscanf(s, "%llx", &ru); |
| 494 | if (ru > EV_INT64_MAX) |
| 495 | return 0; |
| 496 | r = (long long) ru; |
| 497 | } |
| 498 | if (n != 1) |
| 499 | return 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 500 | while (EVUTIL_ISSPACE_(*s)) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 501 | ++s; |
| 502 | if (*s == '-') |
| 503 | ++s; |
| 504 | if (base == 10) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 505 | while (EVUTIL_ISDIGIT_(*s)) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 506 | ++s; |
| 507 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 508 | while (EVUTIL_ISXDIGIT_(*s)) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 509 | ++s; |
| 510 | } |
| 511 | if (endptr) |
| 512 | *endptr = (char*) s; |
| 513 | return r; |
| 514 | #else |
| 515 | #error "I don't know how to parse 64-bit integers." |
| 516 | #endif |
| 517 | } |
| 518 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 519 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 520 | int |
| 521 | evutil_socket_geterror(evutil_socket_t sock) |
| 522 | { |
| 523 | int optval, optvallen=sizeof(optval); |
| 524 | int err = WSAGetLastError(); |
| 525 | if (err == WSAEWOULDBLOCK && sock >= 0) { |
| 526 | if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&optval, |
| 527 | &optvallen)) |
| 528 | return err; |
| 529 | if (optval) |
| 530 | return optval; |
| 531 | } |
| 532 | return err; |
| 533 | } |
| 534 | #endif |
| 535 | |
| 536 | /* XXX we should use an enum here. */ |
| 537 | /* 2 for connection refused, 1 for connected, 0 for not yet, -1 for error. */ |
| 538 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 539 | evutil_socket_connect_(evutil_socket_t *fd_ptr, const struct sockaddr *sa, int socklen) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 540 | { |
| 541 | int made_fd = 0; |
| 542 | |
| 543 | if (*fd_ptr < 0) { |
| 544 | if ((*fd_ptr = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) |
| 545 | goto err; |
| 546 | made_fd = 1; |
| 547 | if (evutil_make_socket_nonblocking(*fd_ptr) < 0) { |
| 548 | goto err; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | if (connect(*fd_ptr, sa, socklen) < 0) { |
| 553 | int e = evutil_socket_geterror(*fd_ptr); |
| 554 | if (EVUTIL_ERR_CONNECT_RETRIABLE(e)) |
| 555 | return 0; |
| 556 | if (EVUTIL_ERR_CONNECT_REFUSED(e)) |
| 557 | return 2; |
| 558 | goto err; |
| 559 | } else { |
| 560 | return 1; |
| 561 | } |
| 562 | |
| 563 | err: |
| 564 | if (made_fd) { |
| 565 | evutil_closesocket(*fd_ptr); |
| 566 | *fd_ptr = -1; |
| 567 | } |
| 568 | return -1; |
| 569 | } |
| 570 | |
| 571 | /* Check whether a socket on which we called connect() is done |
| 572 | connecting. Return 1 for connected, 0 for not yet, -1 for error. In the |
| 573 | error case, set the current socket errno to the error that happened during |
| 574 | the connect operation. */ |
| 575 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 576 | evutil_socket_finished_connecting_(evutil_socket_t fd) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 577 | { |
| 578 | int e; |
| 579 | ev_socklen_t elen = sizeof(e); |
| 580 | |
| 581 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&e, &elen) < 0) |
| 582 | return -1; |
| 583 | |
| 584 | if (e) { |
| 585 | if (EVUTIL_ERR_CONNECT_RETRIABLE(e)) |
| 586 | return 0; |
| 587 | EVUTIL_SET_SOCKET_ERROR(e); |
| 588 | return -1; |
| 589 | } |
| 590 | |
| 591 | return 1; |
| 592 | } |
| 593 | |
| 594 | #if (EVUTIL_AI_PASSIVE|EVUTIL_AI_CANONNAME|EVUTIL_AI_NUMERICHOST| \ |
| 595 | EVUTIL_AI_NUMERICSERV|EVUTIL_AI_V4MAPPED|EVUTIL_AI_ALL| \ |
| 596 | EVUTIL_AI_ADDRCONFIG) != \ |
| 597 | (EVUTIL_AI_PASSIVE^EVUTIL_AI_CANONNAME^EVUTIL_AI_NUMERICHOST^ \ |
| 598 | EVUTIL_AI_NUMERICSERV^EVUTIL_AI_V4MAPPED^EVUTIL_AI_ALL^ \ |
| 599 | EVUTIL_AI_ADDRCONFIG) |
| 600 | #error "Some of our EVUTIL_AI_* flags seem to overlap with system AI_* flags" |
| 601 | #endif |
| 602 | |
| 603 | /* We sometimes need to know whether we have an ipv4 address and whether we |
| 604 | have an ipv6 address. If 'have_checked_interfaces', then we've already done |
| 605 | the test. If 'had_ipv4_address', then it turns out we had an ipv4 address. |
| 606 | If 'had_ipv6_address', then it turns out we had an ipv6 address. These are |
| 607 | set by evutil_check_interfaces. */ |
| 608 | static int have_checked_interfaces, had_ipv4_address, had_ipv6_address; |
| 609 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 610 | /* True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8 */ |
| 611 | static inline int evutil_v4addr_is_localhost(ev_uint32_t addr) |
| 612 | { return addr>>24 == 127; } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 613 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 614 | /* True iff the IPv4 address 'addr', in host order, is link-local |
| 615 | * 169.254.0.0/16 (RFC3927) */ |
| 616 | static inline int evutil_v4addr_is_linklocal(ev_uint32_t addr) |
| 617 | { return ((addr & 0xffff0000U) == 0xa9fe0000U); } |
| 618 | |
| 619 | /* True iff the IPv4 address 'addr', in host order, is a class D |
| 620 | * (multiclass) address. */ |
| 621 | static inline int evutil_v4addr_is_classd(ev_uint32_t addr) |
| 622 | { return ((addr>>24) & 0xf0) == 0xe0; } |
| 623 | |
| 624 | int |
| 625 | evutil_v4addr_is_local_(const struct in_addr *in) |
| 626 | { |
| 627 | const ev_uint32_t addr = ntohl(in->s_addr); |
| 628 | return addr == INADDR_ANY || |
| 629 | evutil_v4addr_is_localhost(addr) || |
| 630 | evutil_v4addr_is_linklocal(addr) || |
| 631 | evutil_v4addr_is_classd(addr); |
| 632 | } |
| 633 | int |
| 634 | evutil_v6addr_is_local_(const struct in6_addr *in) |
| 635 | { |
| 636 | static const char ZEROES[] = |
| 637 | "\x00\x00\x00\x00\x00\x00\x00\x00" |
| 638 | "\x00\x00\x00\x00\x00\x00\x00\x00"; |
| 639 | |
| 640 | const unsigned char *addr = (const unsigned char *)in->s6_addr; |
| 641 | return !memcmp(addr, ZEROES, 8) || |
| 642 | ((addr[0] & 0xfe) == 0xfc) || |
| 643 | (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80) || |
| 644 | (addr[0] == 0xfe && (addr[1] & 0xc0) == 0xc0) || |
| 645 | (addr[0] == 0xff); |
| 646 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 647 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 648 | static void |
| 649 | evutil_found_ifaddr(const struct sockaddr *sa) |
| 650 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 651 | if (sa->sa_family == AF_INET) { |
| 652 | const struct sockaddr_in *sin = (struct sockaddr_in *)sa; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 653 | if (!evutil_v4addr_is_local_(&sin->sin_addr)) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 654 | event_debug(("Detected an IPv4 interface")); |
| 655 | had_ipv4_address = 1; |
| 656 | } |
| 657 | } else if (sa->sa_family == AF_INET6) { |
| 658 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 659 | if (!evutil_v6addr_is_local_(&sin6->sin6_addr)) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 660 | event_debug(("Detected an IPv6 interface")); |
| 661 | had_ipv6_address = 1; |
| 662 | } |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | #ifdef _WIN32 |
| 667 | typedef ULONG (WINAPI *GetAdaptersAddresses_fn_t)( |
| 668 | ULONG, ULONG, PVOID, PIP_ADAPTER_ADDRESSES, PULONG); |
| 669 | #endif |
| 670 | |
| 671 | static int |
| 672 | evutil_check_ifaddrs(void) |
| 673 | { |
| 674 | #if defined(EVENT__HAVE_GETIFADDRS) |
| 675 | /* Most free Unixy systems provide getifaddrs, which gives us a linked list |
| 676 | * of struct ifaddrs. */ |
| 677 | struct ifaddrs *ifa = NULL; |
| 678 | const struct ifaddrs *i; |
| 679 | if (getifaddrs(&ifa) < 0) { |
| 680 | event_warn("Unable to call getifaddrs()"); |
| 681 | return -1; |
| 682 | } |
| 683 | |
| 684 | for (i = ifa; i; i = i->ifa_next) { |
| 685 | if (!i->ifa_addr) |
| 686 | continue; |
| 687 | evutil_found_ifaddr(i->ifa_addr); |
| 688 | } |
| 689 | |
| 690 | freeifaddrs(ifa); |
| 691 | return 0; |
| 692 | #elif defined(_WIN32) |
| 693 | /* Windows XP began to provide GetAdaptersAddresses. Windows 2000 had a |
| 694 | "GetAdaptersInfo", but that's deprecated; let's just try |
| 695 | GetAdaptersAddresses and fall back to connect+getsockname. |
| 696 | */ |
| 697 | HMODULE lib = evutil_load_windows_system_library_(TEXT("ihplapi.dll")); |
| 698 | GetAdaptersAddresses_fn_t fn; |
| 699 | ULONG size, res; |
| 700 | IP_ADAPTER_ADDRESSES *addresses = NULL, *address; |
| 701 | int result = -1; |
| 702 | |
| 703 | #define FLAGS (GAA_FLAG_SKIP_ANYCAST | \ |
| 704 | GAA_FLAG_SKIP_MULTICAST | \ |
| 705 | GAA_FLAG_SKIP_DNS_SERVER) |
| 706 | |
| 707 | if (!lib) |
| 708 | goto done; |
| 709 | |
| 710 | if (!(fn = (GetAdaptersAddresses_fn_t) GetProcAddress(lib, "GetAdaptersAddresses"))) |
| 711 | goto done; |
| 712 | |
| 713 | /* Guess how much space we need. */ |
| 714 | size = 15*1024; |
| 715 | addresses = mm_malloc(size); |
| 716 | if (!addresses) |
| 717 | goto done; |
| 718 | res = fn(AF_UNSPEC, FLAGS, NULL, addresses, &size); |
| 719 | if (res == ERROR_BUFFER_OVERFLOW) { |
| 720 | /* we didn't guess that we needed enough space; try again */ |
| 721 | mm_free(addresses); |
| 722 | addresses = mm_malloc(size); |
| 723 | if (!addresses) |
| 724 | goto done; |
| 725 | res = fn(AF_UNSPEC, FLAGS, NULL, addresses, &size); |
| 726 | } |
| 727 | if (res != NO_ERROR) |
| 728 | goto done; |
| 729 | |
| 730 | for (address = addresses; address; address = address->Next) { |
| 731 | IP_ADAPTER_UNICAST_ADDRESS *a; |
| 732 | for (a = address->FirstUnicastAddress; a; a = a->Next) { |
| 733 | /* Yes, it's a linked list inside a linked list */ |
| 734 | struct sockaddr *sa = a->Address.lpSockaddr; |
| 735 | evutil_found_ifaddr(sa); |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | result = 0; |
| 740 | done: |
| 741 | if (lib) |
| 742 | FreeLibrary(lib); |
| 743 | if (addresses) |
| 744 | mm_free(addresses); |
| 745 | return result; |
| 746 | #else |
| 747 | return -1; |
| 748 | #endif |
| 749 | } |
| 750 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 751 | /* Test whether we have an ipv4 interface and an ipv6 interface. Return 0 if |
| 752 | * the test seemed successful. */ |
| 753 | static int |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 754 | evutil_check_interfaces(void) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 755 | { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 756 | evutil_socket_t fd = -1; |
| 757 | struct sockaddr_in sin, sin_out; |
| 758 | struct sockaddr_in6 sin6, sin6_out; |
| 759 | ev_socklen_t sin_out_len = sizeof(sin_out); |
| 760 | ev_socklen_t sin6_out_len = sizeof(sin6_out); |
| 761 | int r; |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 762 | if (have_checked_interfaces) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 763 | return 0; |
| 764 | |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 765 | /* From this point on we have done the ipv4/ipv6 interface check */ |
| 766 | have_checked_interfaces = 1; |
| 767 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 768 | if (evutil_check_ifaddrs() == 0) { |
| 769 | /* Use a nice sane interface, if this system has one. */ |
| 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | /* Ugh. There was no nice sane interface. So to check whether we have |
| 774 | * an interface open for a given protocol, will try to make a UDP |
| 775 | * 'connection' to a remote host on the internet. We don't actually |
| 776 | * use it, so the address doesn't matter, but we want to pick one that |
| 777 | * keep us from using a host- or link-local interface. */ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 778 | memset(&sin, 0, sizeof(sin)); |
| 779 | sin.sin_family = AF_INET; |
| 780 | sin.sin_port = htons(53); |
| 781 | r = evutil_inet_pton(AF_INET, "18.244.0.188", &sin.sin_addr); |
| 782 | EVUTIL_ASSERT(r); |
| 783 | |
| 784 | memset(&sin6, 0, sizeof(sin6)); |
| 785 | sin6.sin6_family = AF_INET6; |
| 786 | sin6.sin6_port = htons(53); |
| 787 | r = evutil_inet_pton(AF_INET6, "2001:4860:b002::68", &sin6.sin6_addr); |
| 788 | EVUTIL_ASSERT(r); |
| 789 | |
| 790 | memset(&sin_out, 0, sizeof(sin_out)); |
| 791 | memset(&sin6_out, 0, sizeof(sin6_out)); |
| 792 | |
| 793 | /* XXX some errnos mean 'no address'; some mean 'not enough sockets'. */ |
| 794 | if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) >= 0 && |
| 795 | connect(fd, (struct sockaddr*)&sin, sizeof(sin)) == 0 && |
| 796 | getsockname(fd, (struct sockaddr*)&sin_out, &sin_out_len) == 0) { |
| 797 | /* We might have an IPv4 interface. */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 798 | evutil_found_ifaddr((struct sockaddr*) &sin_out); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 799 | } |
| 800 | if (fd >= 0) |
| 801 | evutil_closesocket(fd); |
| 802 | |
| 803 | if ((fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) >= 0 && |
| 804 | connect(fd, (struct sockaddr*)&sin6, sizeof(sin6)) == 0 && |
| 805 | getsockname(fd, (struct sockaddr*)&sin6_out, &sin6_out_len) == 0) { |
| 806 | /* We might have an IPv6 interface. */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 807 | evutil_found_ifaddr((struct sockaddr*) &sin6_out); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 808 | } |
| 809 | |
| 810 | if (fd >= 0) |
| 811 | evutil_closesocket(fd); |
| 812 | |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | /* Internal addrinfo flag. This one is set when we allocate the addrinfo from |
| 817 | * inside libevent. Otherwise, the built-in getaddrinfo() function allocated |
| 818 | * it, and we should trust what they said. |
| 819 | **/ |
| 820 | #define EVUTIL_AI_LIBEVENT_ALLOCATED 0x80000000 |
| 821 | |
| 822 | /* Helper: construct a new addrinfo containing the socket address in |
| 823 | * 'sa', which must be a sockaddr_in or a sockaddr_in6. Take the |
| 824 | * socktype and protocol info from hints. If they weren't set, then |
| 825 | * allocate both a TCP and a UDP addrinfo. |
| 826 | */ |
| 827 | struct evutil_addrinfo * |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 828 | evutil_new_addrinfo_(struct sockaddr *sa, ev_socklen_t socklen, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 829 | const struct evutil_addrinfo *hints) |
| 830 | { |
| 831 | struct evutil_addrinfo *res; |
| 832 | EVUTIL_ASSERT(hints); |
| 833 | |
| 834 | if (hints->ai_socktype == 0 && hints->ai_protocol == 0) { |
| 835 | /* Indecisive user! Give them a UDP and a TCP. */ |
| 836 | struct evutil_addrinfo *r1, *r2; |
| 837 | struct evutil_addrinfo tmp; |
| 838 | memcpy(&tmp, hints, sizeof(tmp)); |
| 839 | tmp.ai_socktype = SOCK_STREAM; tmp.ai_protocol = IPPROTO_TCP; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 840 | r1 = evutil_new_addrinfo_(sa, socklen, &tmp); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 841 | if (!r1) |
| 842 | return NULL; |
| 843 | tmp.ai_socktype = SOCK_DGRAM; tmp.ai_protocol = IPPROTO_UDP; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 844 | r2 = evutil_new_addrinfo_(sa, socklen, &tmp); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 845 | if (!r2) { |
| 846 | evutil_freeaddrinfo(r1); |
| 847 | return NULL; |
| 848 | } |
| 849 | r1->ai_next = r2; |
| 850 | return r1; |
| 851 | } |
| 852 | |
| 853 | /* We're going to allocate extra space to hold the sockaddr. */ |
| 854 | res = mm_calloc(1,sizeof(struct evutil_addrinfo)+socklen); |
| 855 | if (!res) |
| 856 | return NULL; |
| 857 | res->ai_addr = (struct sockaddr*) |
| 858 | (((char*)res) + sizeof(struct evutil_addrinfo)); |
| 859 | memcpy(res->ai_addr, sa, socklen); |
| 860 | res->ai_addrlen = socklen; |
| 861 | res->ai_family = sa->sa_family; /* Same or not? XXX */ |
| 862 | res->ai_flags = EVUTIL_AI_LIBEVENT_ALLOCATED; |
| 863 | res->ai_socktype = hints->ai_socktype; |
| 864 | res->ai_protocol = hints->ai_protocol; |
| 865 | |
| 866 | return res; |
| 867 | } |
| 868 | |
| 869 | /* Append the addrinfo 'append' to the end of 'first', and return the start of |
| 870 | * the list. Either element can be NULL, in which case we return the element |
| 871 | * that is not NULL. */ |
| 872 | struct evutil_addrinfo * |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 873 | evutil_addrinfo_append_(struct evutil_addrinfo *first, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 874 | struct evutil_addrinfo *append) |
| 875 | { |
| 876 | struct evutil_addrinfo *ai = first; |
| 877 | if (!ai) |
| 878 | return append; |
| 879 | while (ai->ai_next) |
| 880 | ai = ai->ai_next; |
| 881 | ai->ai_next = append; |
| 882 | |
| 883 | return first; |
| 884 | } |
| 885 | |
| 886 | static int |
| 887 | parse_numeric_servname(const char *servname) |
| 888 | { |
| 889 | int n; |
| 890 | char *endptr=NULL; |
| 891 | n = (int) strtol(servname, &endptr, 10); |
| 892 | if (n>=0 && n <= 65535 && servname[0] && endptr && !endptr[0]) |
| 893 | return n; |
| 894 | else |
| 895 | return -1; |
| 896 | } |
| 897 | |
| 898 | /** Parse a service name in 'servname', which can be a decimal port. |
| 899 | * Return the port number, or -1 on error. |
| 900 | */ |
| 901 | static int |
| 902 | evutil_parse_servname(const char *servname, const char *protocol, |
| 903 | const struct evutil_addrinfo *hints) |
| 904 | { |
| 905 | int n = parse_numeric_servname(servname); |
| 906 | if (n>=0) |
| 907 | return n; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 908 | #if defined(EVENT__HAVE_GETSERVBYNAME) || defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 909 | if (!(hints->ai_flags & EVUTIL_AI_NUMERICSERV)) { |
| 910 | struct servent *ent = getservbyname(servname, protocol); |
| 911 | if (ent) { |
| 912 | return ntohs(ent->s_port); |
| 913 | } |
| 914 | } |
| 915 | #endif |
| 916 | return -1; |
| 917 | } |
| 918 | |
| 919 | /* Return a string corresponding to a protocol number that we can pass to |
| 920 | * getservyname. */ |
| 921 | static const char * |
| 922 | evutil_unparse_protoname(int proto) |
| 923 | { |
| 924 | switch (proto) { |
| 925 | case 0: |
| 926 | return NULL; |
| 927 | case IPPROTO_TCP: |
| 928 | return "tcp"; |
| 929 | case IPPROTO_UDP: |
| 930 | return "udp"; |
| 931 | #ifdef IPPROTO_SCTP |
| 932 | case IPPROTO_SCTP: |
| 933 | return "sctp"; |
| 934 | #endif |
| 935 | default: |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 936 | #ifdef EVENT__HAVE_GETPROTOBYNUMBER |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 937 | { |
| 938 | struct protoent *ent = getprotobynumber(proto); |
| 939 | if (ent) |
| 940 | return ent->p_name; |
| 941 | } |
| 942 | #endif |
| 943 | return NULL; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | static void |
| 948 | evutil_getaddrinfo_infer_protocols(struct evutil_addrinfo *hints) |
| 949 | { |
| 950 | /* If we can guess the protocol from the socktype, do so. */ |
| 951 | if (!hints->ai_protocol && hints->ai_socktype) { |
| 952 | if (hints->ai_socktype == SOCK_DGRAM) |
| 953 | hints->ai_protocol = IPPROTO_UDP; |
| 954 | else if (hints->ai_socktype == SOCK_STREAM) |
| 955 | hints->ai_protocol = IPPROTO_TCP; |
| 956 | } |
| 957 | |
| 958 | /* Set the socktype if it isn't set. */ |
| 959 | if (!hints->ai_socktype && hints->ai_protocol) { |
| 960 | if (hints->ai_protocol == IPPROTO_UDP) |
| 961 | hints->ai_socktype = SOCK_DGRAM; |
| 962 | else if (hints->ai_protocol == IPPROTO_TCP) |
| 963 | hints->ai_socktype = SOCK_STREAM; |
| 964 | #ifdef IPPROTO_SCTP |
| 965 | else if (hints->ai_protocol == IPPROTO_SCTP) |
| 966 | hints->ai_socktype = SOCK_STREAM; |
| 967 | #endif |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | #if AF_UNSPEC != PF_UNSPEC |
| 972 | #error "I cannot build on a system where AF_UNSPEC != PF_UNSPEC" |
| 973 | #endif |
| 974 | |
| 975 | /** Implements the part of looking up hosts by name that's common to both |
| 976 | * the blocking and nonblocking resolver: |
| 977 | * - Adjust 'hints' to have a reasonable socktype and protocol. |
| 978 | * - Look up the port based on 'servname', and store it in *portnum, |
| 979 | * - Handle the nodename==NULL case |
| 980 | * - Handle some invalid arguments cases. |
| 981 | * - Handle the cases where nodename is an IPv4 or IPv6 address. |
| 982 | * |
| 983 | * If we need the resolver to look up the hostname, we return |
| 984 | * EVUTIL_EAI_NEED_RESOLVE. Otherwise, we can completely implement |
| 985 | * getaddrinfo: we return 0 or an appropriate EVUTIL_EAI_* error, and |
| 986 | * set *res as getaddrinfo would. |
| 987 | */ |
| 988 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 989 | evutil_getaddrinfo_common_(const char *nodename, const char *servname, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 990 | struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum) |
| 991 | { |
| 992 | int port = 0; |
| 993 | const char *pname; |
| 994 | |
| 995 | if (nodename == NULL && servname == NULL) |
| 996 | return EVUTIL_EAI_NONAME; |
| 997 | |
| 998 | /* We only understand 3 families */ |
| 999 | if (hints->ai_family != PF_UNSPEC && hints->ai_family != PF_INET && |
| 1000 | hints->ai_family != PF_INET6) |
| 1001 | return EVUTIL_EAI_FAMILY; |
| 1002 | |
| 1003 | evutil_getaddrinfo_infer_protocols(hints); |
| 1004 | |
| 1005 | /* Look up the port number and protocol, if possible. */ |
| 1006 | pname = evutil_unparse_protoname(hints->ai_protocol); |
| 1007 | if (servname) { |
| 1008 | /* XXXX We could look at the protocol we got back from |
| 1009 | * getservbyname, but it doesn't seem too useful. */ |
| 1010 | port = evutil_parse_servname(servname, pname, hints); |
| 1011 | if (port < 0) { |
| 1012 | return EVUTIL_EAI_NONAME; |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | /* If we have no node name, then we're supposed to bind to 'any' and |
| 1017 | * connect to localhost. */ |
| 1018 | if (nodename == NULL) { |
| 1019 | struct evutil_addrinfo *res4=NULL, *res6=NULL; |
| 1020 | if (hints->ai_family != PF_INET) { /* INET6 or UNSPEC. */ |
| 1021 | struct sockaddr_in6 sin6; |
| 1022 | memset(&sin6, 0, sizeof(sin6)); |
| 1023 | sin6.sin6_family = AF_INET6; |
| 1024 | sin6.sin6_port = htons(port); |
| 1025 | if (hints->ai_flags & EVUTIL_AI_PASSIVE) { |
| 1026 | /* Bind to :: */ |
| 1027 | } else { |
| 1028 | /* connect to ::1 */ |
| 1029 | sin6.sin6_addr.s6_addr[15] = 1; |
| 1030 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1031 | res6 = evutil_new_addrinfo_((struct sockaddr*)&sin6, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1032 | sizeof(sin6), hints); |
| 1033 | if (!res6) |
| 1034 | return EVUTIL_EAI_MEMORY; |
| 1035 | } |
| 1036 | |
| 1037 | if (hints->ai_family != PF_INET6) { /* INET or UNSPEC */ |
| 1038 | struct sockaddr_in sin; |
| 1039 | memset(&sin, 0, sizeof(sin)); |
| 1040 | sin.sin_family = AF_INET; |
| 1041 | sin.sin_port = htons(port); |
| 1042 | if (hints->ai_flags & EVUTIL_AI_PASSIVE) { |
| 1043 | /* Bind to 0.0.0.0 */ |
| 1044 | } else { |
| 1045 | /* connect to 127.0.0.1 */ |
| 1046 | sin.sin_addr.s_addr = htonl(0x7f000001); |
| 1047 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1048 | res4 = evutil_new_addrinfo_((struct sockaddr*)&sin, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1049 | sizeof(sin), hints); |
| 1050 | if (!res4) { |
| 1051 | if (res6) |
| 1052 | evutil_freeaddrinfo(res6); |
| 1053 | return EVUTIL_EAI_MEMORY; |
| 1054 | } |
| 1055 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1056 | *res = evutil_addrinfo_append_(res4, res6); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1057 | return 0; |
| 1058 | } |
| 1059 | |
| 1060 | /* If we can, we should try to parse the hostname without resolving |
| 1061 | * it. */ |
| 1062 | /* Try ipv6. */ |
| 1063 | if (hints->ai_family == PF_INET6 || hints->ai_family == PF_UNSPEC) { |
| 1064 | struct sockaddr_in6 sin6; |
| 1065 | memset(&sin6, 0, sizeof(sin6)); |
| 1066 | if (1==evutil_inet_pton(AF_INET6, nodename, &sin6.sin6_addr)) { |
| 1067 | /* Got an ipv6 address. */ |
| 1068 | sin6.sin6_family = AF_INET6; |
| 1069 | sin6.sin6_port = htons(port); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1070 | *res = evutil_new_addrinfo_((struct sockaddr*)&sin6, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1071 | sizeof(sin6), hints); |
| 1072 | if (!*res) |
| 1073 | return EVUTIL_EAI_MEMORY; |
| 1074 | return 0; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | /* Try ipv4. */ |
| 1079 | if (hints->ai_family == PF_INET || hints->ai_family == PF_UNSPEC) { |
| 1080 | struct sockaddr_in sin; |
| 1081 | memset(&sin, 0, sizeof(sin)); |
| 1082 | if (1==evutil_inet_pton(AF_INET, nodename, &sin.sin_addr)) { |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 1083 | /* Got an ipv4 address. */ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1084 | sin.sin_family = AF_INET; |
| 1085 | sin.sin_port = htons(port); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1086 | *res = evutil_new_addrinfo_((struct sockaddr*)&sin, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1087 | sizeof(sin), hints); |
| 1088 | if (!*res) |
| 1089 | return EVUTIL_EAI_MEMORY; |
| 1090 | return 0; |
| 1091 | } |
| 1092 | } |
| 1093 | |
| 1094 | |
| 1095 | /* If we have reached this point, we definitely need to do a DNS |
| 1096 | * lookup. */ |
| 1097 | if ((hints->ai_flags & EVUTIL_AI_NUMERICHOST)) { |
| 1098 | /* If we're not allowed to do one, then say so. */ |
| 1099 | return EVUTIL_EAI_NONAME; |
| 1100 | } |
| 1101 | *portnum = port; |
| 1102 | return EVUTIL_EAI_NEED_RESOLVE; |
| 1103 | } |
| 1104 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1105 | #ifdef EVENT__HAVE_GETADDRINFO |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1106 | #define USE_NATIVE_GETADDRINFO |
| 1107 | #endif |
| 1108 | |
| 1109 | #ifdef USE_NATIVE_GETADDRINFO |
| 1110 | /* A mask of all the flags that we declare, so we can clear them before calling |
| 1111 | * the native getaddrinfo */ |
| 1112 | static const unsigned int ALL_NONNATIVE_AI_FLAGS = |
| 1113 | #ifndef AI_PASSIVE |
| 1114 | EVUTIL_AI_PASSIVE | |
| 1115 | #endif |
| 1116 | #ifndef AI_CANONNAME |
| 1117 | EVUTIL_AI_CANONNAME | |
| 1118 | #endif |
| 1119 | #ifndef AI_NUMERICHOST |
| 1120 | EVUTIL_AI_NUMERICHOST | |
| 1121 | #endif |
| 1122 | #ifndef AI_NUMERICSERV |
| 1123 | EVUTIL_AI_NUMERICSERV | |
| 1124 | #endif |
| 1125 | #ifndef AI_ADDRCONFIG |
| 1126 | EVUTIL_AI_ADDRCONFIG | |
| 1127 | #endif |
| 1128 | #ifndef AI_ALL |
| 1129 | EVUTIL_AI_ALL | |
| 1130 | #endif |
| 1131 | #ifndef AI_V4MAPPED |
| 1132 | EVUTIL_AI_V4MAPPED | |
| 1133 | #endif |
| 1134 | EVUTIL_AI_LIBEVENT_ALLOCATED; |
| 1135 | |
| 1136 | static const unsigned int ALL_NATIVE_AI_FLAGS = |
| 1137 | #ifdef AI_PASSIVE |
| 1138 | AI_PASSIVE | |
| 1139 | #endif |
| 1140 | #ifdef AI_CANONNAME |
| 1141 | AI_CANONNAME | |
| 1142 | #endif |
| 1143 | #ifdef AI_NUMERICHOST |
| 1144 | AI_NUMERICHOST | |
| 1145 | #endif |
| 1146 | #ifdef AI_NUMERICSERV |
| 1147 | AI_NUMERICSERV | |
| 1148 | #endif |
| 1149 | #ifdef AI_ADDRCONFIG |
| 1150 | AI_ADDRCONFIG | |
| 1151 | #endif |
| 1152 | #ifdef AI_ALL |
| 1153 | AI_ALL | |
| 1154 | #endif |
| 1155 | #ifdef AI_V4MAPPED |
| 1156 | AI_V4MAPPED | |
| 1157 | #endif |
| 1158 | 0; |
| 1159 | #endif |
| 1160 | |
| 1161 | #ifndef USE_NATIVE_GETADDRINFO |
| 1162 | /* Helper for systems with no getaddrinfo(): make one or more addrinfos out of |
| 1163 | * a struct hostent. |
| 1164 | */ |
| 1165 | static struct evutil_addrinfo * |
| 1166 | addrinfo_from_hostent(const struct hostent *ent, |
| 1167 | int port, const struct evutil_addrinfo *hints) |
| 1168 | { |
| 1169 | int i; |
| 1170 | struct sockaddr_in sin; |
| 1171 | struct sockaddr_in6 sin6; |
| 1172 | struct sockaddr *sa; |
| 1173 | int socklen; |
| 1174 | struct evutil_addrinfo *res=NULL, *ai; |
| 1175 | void *addrp; |
| 1176 | |
| 1177 | if (ent->h_addrtype == PF_INET) { |
| 1178 | memset(&sin, 0, sizeof(sin)); |
| 1179 | sin.sin_family = AF_INET; |
| 1180 | sin.sin_port = htons(port); |
| 1181 | sa = (struct sockaddr *)&sin; |
| 1182 | socklen = sizeof(struct sockaddr_in); |
| 1183 | addrp = &sin.sin_addr; |
| 1184 | if (ent->h_length != sizeof(sin.sin_addr)) { |
| 1185 | event_warnx("Weird h_length from gethostbyname"); |
| 1186 | return NULL; |
| 1187 | } |
| 1188 | } else if (ent->h_addrtype == PF_INET6) { |
| 1189 | memset(&sin6, 0, sizeof(sin6)); |
| 1190 | sin6.sin6_family = AF_INET6; |
| 1191 | sin6.sin6_port = htons(port); |
| 1192 | sa = (struct sockaddr *)&sin6; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1193 | socklen = sizeof(struct sockaddr_in6); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1194 | addrp = &sin6.sin6_addr; |
| 1195 | if (ent->h_length != sizeof(sin6.sin6_addr)) { |
| 1196 | event_warnx("Weird h_length from gethostbyname"); |
| 1197 | return NULL; |
| 1198 | } |
| 1199 | } else |
| 1200 | return NULL; |
| 1201 | |
| 1202 | for (i = 0; ent->h_addr_list[i]; ++i) { |
| 1203 | memcpy(addrp, ent->h_addr_list[i], ent->h_length); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1204 | ai = evutil_new_addrinfo_(sa, socklen, hints); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1205 | if (!ai) { |
| 1206 | evutil_freeaddrinfo(res); |
| 1207 | return NULL; |
| 1208 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1209 | res = evutil_addrinfo_append_(res, ai); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1210 | } |
| 1211 | |
| 1212 | if (res && ((hints->ai_flags & EVUTIL_AI_CANONNAME) && ent->h_name)) { |
| 1213 | res->ai_canonname = mm_strdup(ent->h_name); |
| 1214 | if (res->ai_canonname == NULL) { |
| 1215 | evutil_freeaddrinfo(res); |
| 1216 | return NULL; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | return res; |
| 1221 | } |
| 1222 | #endif |
| 1223 | |
| 1224 | /* If the EVUTIL_AI_ADDRCONFIG flag is set on hints->ai_flags, and |
| 1225 | * hints->ai_family is PF_UNSPEC, then revise the value of hints->ai_family so |
| 1226 | * that we'll only get addresses we could maybe connect to. |
| 1227 | */ |
| 1228 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1229 | evutil_adjust_hints_for_addrconfig_(struct evutil_addrinfo *hints) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1230 | { |
| 1231 | if (!(hints->ai_flags & EVUTIL_AI_ADDRCONFIG)) |
| 1232 | return; |
| 1233 | if (hints->ai_family != PF_UNSPEC) |
| 1234 | return; |
Haibo Huang | 4572909 | 2019-08-01 16:15:45 -0700 | [diff] [blame] | 1235 | evutil_check_interfaces(); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1236 | if (had_ipv4_address && !had_ipv6_address) { |
| 1237 | hints->ai_family = PF_INET; |
| 1238 | } else if (!had_ipv4_address && had_ipv6_address) { |
| 1239 | hints->ai_family = PF_INET6; |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | #ifdef USE_NATIVE_GETADDRINFO |
| 1244 | static int need_numeric_port_hack_=0; |
| 1245 | static int need_socktype_protocol_hack_=0; |
| 1246 | static int tested_for_getaddrinfo_hacks=0; |
| 1247 | |
| 1248 | /* Some older BSDs (like OpenBSD up to 4.6) used to believe that |
| 1249 | giving a numeric port without giving an ai_socktype was verboten. |
| 1250 | We test for this so we can apply an appropriate workaround. If it |
| 1251 | turns out that the bug is present, then: |
| 1252 | |
| 1253 | - If nodename==NULL and servname is numeric, we build an answer |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1254 | ourselves using evutil_getaddrinfo_common_(). |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1255 | |
| 1256 | - If nodename!=NULL and servname is numeric, then we set |
| 1257 | servname=NULL when calling getaddrinfo, and post-process the |
| 1258 | result to set the ports on it. |
| 1259 | |
| 1260 | We test for this bug at runtime, since otherwise we can't have the |
| 1261 | same binary run on multiple BSD versions. |
| 1262 | |
| 1263 | - Some versions of Solaris believe that it's nice to leave to protocol |
| 1264 | field set to 0. We test for this so we can apply an appropriate |
| 1265 | workaround. |
| 1266 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1267 | static struct evutil_addrinfo *ai_find_protocol(struct evutil_addrinfo *ai) |
| 1268 | { |
| 1269 | while (ai) { |
| 1270 | if (ai->ai_protocol) |
| 1271 | return ai; |
| 1272 | ai = ai->ai_next; |
| 1273 | } |
| 1274 | return NULL; |
| 1275 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1276 | static void |
| 1277 | test_for_getaddrinfo_hacks(void) |
| 1278 | { |
| 1279 | int r, r2; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1280 | struct evutil_addrinfo *ai=NULL, *ai2=NULL, *ai3=NULL; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1281 | struct evutil_addrinfo hints; |
| 1282 | |
| 1283 | memset(&hints,0,sizeof(hints)); |
| 1284 | hints.ai_family = PF_UNSPEC; |
| 1285 | hints.ai_flags = |
| 1286 | #ifdef AI_NUMERICHOST |
| 1287 | AI_NUMERICHOST | |
| 1288 | #endif |
| 1289 | #ifdef AI_NUMERICSERV |
| 1290 | AI_NUMERICSERV | |
| 1291 | #endif |
| 1292 | 0; |
| 1293 | r = getaddrinfo("1.2.3.4", "80", &hints, &ai); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1294 | getaddrinfo("1.2.3.4", NULL, &hints, &ai3); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1295 | hints.ai_socktype = SOCK_STREAM; |
| 1296 | r2 = getaddrinfo("1.2.3.4", "80", &hints, &ai2); |
| 1297 | if (r2 == 0 && r != 0) { |
| 1298 | need_numeric_port_hack_=1; |
| 1299 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1300 | if (!ai_find_protocol(ai2) || !ai_find_protocol(ai3)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1301 | need_socktype_protocol_hack_=1; |
| 1302 | } |
| 1303 | |
| 1304 | if (ai) |
| 1305 | freeaddrinfo(ai); |
| 1306 | if (ai2) |
| 1307 | freeaddrinfo(ai2); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1308 | if (ai3) |
| 1309 | freeaddrinfo(ai3); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1310 | tested_for_getaddrinfo_hacks=1; |
| 1311 | } |
| 1312 | |
| 1313 | static inline int |
| 1314 | need_numeric_port_hack(void) |
| 1315 | { |
| 1316 | if (!tested_for_getaddrinfo_hacks) |
| 1317 | test_for_getaddrinfo_hacks(); |
| 1318 | return need_numeric_port_hack_; |
| 1319 | } |
| 1320 | |
| 1321 | static inline int |
| 1322 | need_socktype_protocol_hack(void) |
| 1323 | { |
| 1324 | if (!tested_for_getaddrinfo_hacks) |
| 1325 | test_for_getaddrinfo_hacks(); |
| 1326 | return need_socktype_protocol_hack_; |
| 1327 | } |
| 1328 | |
| 1329 | static void |
| 1330 | apply_numeric_port_hack(int port, struct evutil_addrinfo **ai) |
| 1331 | { |
| 1332 | /* Now we run through the list and set the ports on all of the |
| 1333 | * results where ports would make sense. */ |
| 1334 | for ( ; *ai; ai = &(*ai)->ai_next) { |
| 1335 | struct sockaddr *sa = (*ai)->ai_addr; |
| 1336 | if (sa && sa->sa_family == AF_INET) { |
| 1337 | struct sockaddr_in *sin = (struct sockaddr_in*)sa; |
| 1338 | sin->sin_port = htons(port); |
| 1339 | } else if (sa && sa->sa_family == AF_INET6) { |
| 1340 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa; |
| 1341 | sin6->sin6_port = htons(port); |
| 1342 | } else { |
| 1343 | /* A numeric port makes no sense here; remove this one |
| 1344 | * from the list. */ |
| 1345 | struct evutil_addrinfo *victim = *ai; |
| 1346 | *ai = victim->ai_next; |
| 1347 | victim->ai_next = NULL; |
| 1348 | freeaddrinfo(victim); |
| 1349 | } |
| 1350 | } |
| 1351 | } |
| 1352 | |
| 1353 | static int |
| 1354 | apply_socktype_protocol_hack(struct evutil_addrinfo *ai) |
| 1355 | { |
| 1356 | struct evutil_addrinfo *ai_new; |
| 1357 | for (; ai; ai = ai->ai_next) { |
| 1358 | evutil_getaddrinfo_infer_protocols(ai); |
| 1359 | if (ai->ai_socktype || ai->ai_protocol) |
| 1360 | continue; |
| 1361 | ai_new = mm_malloc(sizeof(*ai_new)); |
| 1362 | if (!ai_new) |
| 1363 | return -1; |
| 1364 | memcpy(ai_new, ai, sizeof(*ai_new)); |
| 1365 | ai->ai_socktype = SOCK_STREAM; |
| 1366 | ai->ai_protocol = IPPROTO_TCP; |
| 1367 | ai_new->ai_socktype = SOCK_DGRAM; |
| 1368 | ai_new->ai_protocol = IPPROTO_UDP; |
| 1369 | |
| 1370 | ai_new->ai_next = ai->ai_next; |
| 1371 | ai->ai_next = ai_new; |
| 1372 | } |
| 1373 | return 0; |
| 1374 | } |
| 1375 | #endif |
| 1376 | |
| 1377 | int |
| 1378 | evutil_getaddrinfo(const char *nodename, const char *servname, |
| 1379 | const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res) |
| 1380 | { |
| 1381 | #ifdef USE_NATIVE_GETADDRINFO |
| 1382 | struct evutil_addrinfo hints; |
| 1383 | int portnum=-1, need_np_hack, err; |
| 1384 | |
| 1385 | if (hints_in) { |
| 1386 | memcpy(&hints, hints_in, sizeof(hints)); |
| 1387 | } else { |
| 1388 | memset(&hints, 0, sizeof(hints)); |
| 1389 | hints.ai_family = PF_UNSPEC; |
| 1390 | } |
| 1391 | |
| 1392 | #ifndef AI_ADDRCONFIG |
| 1393 | /* Not every system has AI_ADDRCONFIG, so fake it. */ |
| 1394 | if (hints.ai_family == PF_UNSPEC && |
| 1395 | (hints.ai_flags & EVUTIL_AI_ADDRCONFIG)) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1396 | evutil_adjust_hints_for_addrconfig_(&hints); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1397 | } |
| 1398 | #endif |
| 1399 | |
| 1400 | #ifndef AI_NUMERICSERV |
| 1401 | /* Not every system has AI_NUMERICSERV, so fake it. */ |
| 1402 | if (hints.ai_flags & EVUTIL_AI_NUMERICSERV) { |
| 1403 | if (servname && parse_numeric_servname(servname)<0) |
| 1404 | return EVUTIL_EAI_NONAME; |
| 1405 | } |
| 1406 | #endif |
| 1407 | |
| 1408 | /* Enough operating systems handle enough common non-resolve |
| 1409 | * cases here weirdly enough that we are better off just |
| 1410 | * overriding them. For example: |
| 1411 | * |
| 1412 | * - Windows doesn't like to infer the protocol from the |
| 1413 | * socket type, or fill in socket or protocol types much at |
| 1414 | * all. It also seems to do its own broken implicit |
| 1415 | * always-on version of AI_ADDRCONFIG that keeps it from |
| 1416 | * ever resolving even a literal IPv6 address when |
| 1417 | * ai_addrtype is PF_UNSPEC. |
| 1418 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1419 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1420 | { |
| 1421 | int tmp_port; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1422 | err = evutil_getaddrinfo_common_(nodename,servname,&hints, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1423 | res, &tmp_port); |
| 1424 | if (err == 0 || |
| 1425 | err == EVUTIL_EAI_MEMORY || |
| 1426 | err == EVUTIL_EAI_NONAME) |
| 1427 | return err; |
| 1428 | /* If we make it here, the system getaddrinfo can |
| 1429 | * have a crack at it. */ |
| 1430 | } |
| 1431 | #endif |
| 1432 | |
| 1433 | /* See documentation for need_numeric_port_hack above.*/ |
| 1434 | need_np_hack = need_numeric_port_hack() && servname && !hints.ai_socktype |
| 1435 | && ((portnum=parse_numeric_servname(servname)) >= 0); |
| 1436 | if (need_np_hack) { |
| 1437 | if (!nodename) |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1438 | return evutil_getaddrinfo_common_( |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1439 | NULL,servname,&hints, res, &portnum); |
| 1440 | servname = NULL; |
| 1441 | } |
| 1442 | |
| 1443 | if (need_socktype_protocol_hack()) { |
| 1444 | evutil_getaddrinfo_infer_protocols(&hints); |
| 1445 | } |
| 1446 | |
| 1447 | /* Make sure that we didn't actually steal any AI_FLAGS values that |
| 1448 | * the system is using. (This is a constant expression, and should ge |
| 1449 | * optimized out.) |
| 1450 | * |
| 1451 | * XXXX Turn this into a compile-time failure rather than a run-time |
| 1452 | * failure. |
| 1453 | */ |
| 1454 | EVUTIL_ASSERT((ALL_NONNATIVE_AI_FLAGS & ALL_NATIVE_AI_FLAGS) == 0); |
| 1455 | |
| 1456 | /* Clear any flags that only libevent understands. */ |
| 1457 | hints.ai_flags &= ~ALL_NONNATIVE_AI_FLAGS; |
| 1458 | |
| 1459 | err = getaddrinfo(nodename, servname, &hints, res); |
| 1460 | if (need_np_hack) |
| 1461 | apply_numeric_port_hack(portnum, res); |
| 1462 | |
| 1463 | if (need_socktype_protocol_hack()) { |
| 1464 | if (apply_socktype_protocol_hack(*res) < 0) { |
| 1465 | evutil_freeaddrinfo(*res); |
| 1466 | *res = NULL; |
| 1467 | return EVUTIL_EAI_MEMORY; |
| 1468 | } |
| 1469 | } |
| 1470 | return err; |
| 1471 | #else |
| 1472 | int port=0, err; |
| 1473 | struct hostent *ent = NULL; |
| 1474 | struct evutil_addrinfo hints; |
| 1475 | |
| 1476 | if (hints_in) { |
| 1477 | memcpy(&hints, hints_in, sizeof(hints)); |
| 1478 | } else { |
| 1479 | memset(&hints, 0, sizeof(hints)); |
| 1480 | hints.ai_family = PF_UNSPEC; |
| 1481 | } |
| 1482 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1483 | evutil_adjust_hints_for_addrconfig_(&hints); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1484 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1485 | err = evutil_getaddrinfo_common_(nodename, servname, &hints, res, &port); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1486 | if (err != EVUTIL_EAI_NEED_RESOLVE) { |
| 1487 | /* We either succeeded or failed. No need to continue */ |
| 1488 | return err; |
| 1489 | } |
| 1490 | |
| 1491 | err = 0; |
| 1492 | /* Use any of the various gethostbyname_r variants as available. */ |
| 1493 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1494 | #ifdef EVENT__HAVE_GETHOSTBYNAME_R_6_ARG |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1495 | /* This one is what glibc provides. */ |
| 1496 | char buf[2048]; |
| 1497 | struct hostent hostent; |
| 1498 | int r; |
| 1499 | r = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), &ent, |
| 1500 | &err); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1501 | #elif defined(EVENT__HAVE_GETHOSTBYNAME_R_5_ARG) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1502 | char buf[2048]; |
| 1503 | struct hostent hostent; |
| 1504 | ent = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), |
| 1505 | &err); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1506 | #elif defined(EVENT__HAVE_GETHOSTBYNAME_R_3_ARG) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1507 | struct hostent_data data; |
| 1508 | struct hostent hostent; |
| 1509 | memset(&data, 0, sizeof(data)); |
| 1510 | err = gethostbyname_r(nodename, &hostent, &data); |
| 1511 | ent = err ? NULL : &hostent; |
| 1512 | #else |
| 1513 | /* fall back to gethostbyname. */ |
| 1514 | /* XXXX This needs a lock everywhere but Windows. */ |
| 1515 | ent = gethostbyname(nodename); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1516 | #ifdef _WIN32 |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1517 | err = WSAGetLastError(); |
| 1518 | #else |
| 1519 | err = h_errno; |
| 1520 | #endif |
| 1521 | #endif |
| 1522 | |
| 1523 | /* Now we have either ent or err set. */ |
| 1524 | if (!ent) { |
| 1525 | /* XXX is this right for windows ? */ |
| 1526 | switch (err) { |
| 1527 | case TRY_AGAIN: |
| 1528 | return EVUTIL_EAI_AGAIN; |
| 1529 | case NO_RECOVERY: |
| 1530 | default: |
| 1531 | return EVUTIL_EAI_FAIL; |
| 1532 | case HOST_NOT_FOUND: |
| 1533 | return EVUTIL_EAI_NONAME; |
| 1534 | case NO_ADDRESS: |
| 1535 | #if NO_DATA != NO_ADDRESS |
| 1536 | case NO_DATA: |
| 1537 | #endif |
| 1538 | return EVUTIL_EAI_NODATA; |
| 1539 | } |
| 1540 | } |
| 1541 | |
| 1542 | if (ent->h_addrtype != hints.ai_family && |
| 1543 | hints.ai_family != PF_UNSPEC) { |
| 1544 | /* This wasn't the type we were hoping for. Too bad |
| 1545 | * we never had a chance to ask gethostbyname for what |
| 1546 | * we wanted. */ |
| 1547 | return EVUTIL_EAI_NONAME; |
| 1548 | } |
| 1549 | |
| 1550 | /* Make sure we got _some_ answers. */ |
| 1551 | if (ent->h_length == 0) |
| 1552 | return EVUTIL_EAI_NODATA; |
| 1553 | |
| 1554 | /* If we got an address type we don't know how to make a |
| 1555 | sockaddr for, give up. */ |
| 1556 | if (ent->h_addrtype != PF_INET && ent->h_addrtype != PF_INET6) |
| 1557 | return EVUTIL_EAI_FAMILY; |
| 1558 | |
| 1559 | *res = addrinfo_from_hostent(ent, port, &hints); |
| 1560 | if (! *res) |
| 1561 | return EVUTIL_EAI_MEMORY; |
| 1562 | } |
| 1563 | |
| 1564 | return 0; |
| 1565 | #endif |
| 1566 | } |
| 1567 | |
| 1568 | void |
| 1569 | evutil_freeaddrinfo(struct evutil_addrinfo *ai) |
| 1570 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1571 | #ifdef EVENT__HAVE_GETADDRINFO |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1572 | if (!(ai->ai_flags & EVUTIL_AI_LIBEVENT_ALLOCATED)) { |
| 1573 | freeaddrinfo(ai); |
| 1574 | return; |
| 1575 | } |
| 1576 | #endif |
| 1577 | while (ai) { |
| 1578 | struct evutil_addrinfo *next = ai->ai_next; |
| 1579 | if (ai->ai_canonname) |
| 1580 | mm_free(ai->ai_canonname); |
| 1581 | mm_free(ai); |
| 1582 | ai = next; |
| 1583 | } |
| 1584 | } |
| 1585 | |
| 1586 | static evdns_getaddrinfo_fn evdns_getaddrinfo_impl = NULL; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1587 | static evdns_getaddrinfo_cancel_fn evdns_getaddrinfo_cancel_impl = NULL; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1588 | |
| 1589 | void |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1590 | evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1591 | { |
| 1592 | if (!evdns_getaddrinfo_impl) |
| 1593 | evdns_getaddrinfo_impl = fn; |
| 1594 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1595 | void |
| 1596 | evutil_set_evdns_getaddrinfo_cancel_fn_(evdns_getaddrinfo_cancel_fn fn) |
| 1597 | { |
| 1598 | if (!evdns_getaddrinfo_cancel_impl) |
| 1599 | evdns_getaddrinfo_cancel_impl = fn; |
| 1600 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1601 | |
| 1602 | /* Internal helper function: act like evdns_getaddrinfo if dns_base is set; |
| 1603 | * otherwise do a blocking resolve and pass the result to the callback in the |
| 1604 | * way that evdns_getaddrinfo would. |
| 1605 | */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1606 | struct evdns_getaddrinfo_request *evutil_getaddrinfo_async_( |
| 1607 | struct evdns_base *dns_base, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1608 | const char *nodename, const char *servname, |
| 1609 | const struct evutil_addrinfo *hints_in, |
| 1610 | void (*cb)(int, struct evutil_addrinfo *, void *), void *arg) |
| 1611 | { |
| 1612 | if (dns_base && evdns_getaddrinfo_impl) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1613 | return evdns_getaddrinfo_impl( |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1614 | dns_base, nodename, servname, hints_in, cb, arg); |
| 1615 | } else { |
| 1616 | struct evutil_addrinfo *ai=NULL; |
| 1617 | int err; |
| 1618 | err = evutil_getaddrinfo(nodename, servname, hints_in, &ai); |
| 1619 | cb(err, ai, arg); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1620 | return NULL; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1621 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1622 | } |
| 1623 | |
| 1624 | void evutil_getaddrinfo_cancel_async_(struct evdns_getaddrinfo_request *data) |
| 1625 | { |
| 1626 | if (evdns_getaddrinfo_cancel_impl && data) { |
| 1627 | evdns_getaddrinfo_cancel_impl(data); |
| 1628 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1629 | } |
| 1630 | |
| 1631 | const char * |
| 1632 | evutil_gai_strerror(int err) |
| 1633 | { |
| 1634 | /* As a sneaky side-benefit, this case statement will get most |
| 1635 | * compilers to tell us if any of the error codes we defined |
| 1636 | * conflict with the platform's native error codes. */ |
| 1637 | switch (err) { |
| 1638 | case EVUTIL_EAI_CANCEL: |
| 1639 | return "Request canceled"; |
| 1640 | case 0: |
| 1641 | return "No error"; |
| 1642 | |
| 1643 | case EVUTIL_EAI_ADDRFAMILY: |
| 1644 | return "address family for nodename not supported"; |
| 1645 | case EVUTIL_EAI_AGAIN: |
| 1646 | return "temporary failure in name resolution"; |
| 1647 | case EVUTIL_EAI_BADFLAGS: |
| 1648 | return "invalid value for ai_flags"; |
| 1649 | case EVUTIL_EAI_FAIL: |
| 1650 | return "non-recoverable failure in name resolution"; |
| 1651 | case EVUTIL_EAI_FAMILY: |
| 1652 | return "ai_family not supported"; |
| 1653 | case EVUTIL_EAI_MEMORY: |
| 1654 | return "memory allocation failure"; |
| 1655 | case EVUTIL_EAI_NODATA: |
| 1656 | return "no address associated with nodename"; |
| 1657 | case EVUTIL_EAI_NONAME: |
| 1658 | return "nodename nor servname provided, or not known"; |
| 1659 | case EVUTIL_EAI_SERVICE: |
| 1660 | return "servname not supported for ai_socktype"; |
| 1661 | case EVUTIL_EAI_SOCKTYPE: |
| 1662 | return "ai_socktype not supported"; |
| 1663 | case EVUTIL_EAI_SYSTEM: |
| 1664 | return "system error"; |
| 1665 | default: |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1666 | #if defined(USE_NATIVE_GETADDRINFO) && defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1667 | return gai_strerrorA(err); |
| 1668 | #elif defined(USE_NATIVE_GETADDRINFO) |
| 1669 | return gai_strerror(err); |
| 1670 | #else |
| 1671 | return "Unknown error code"; |
| 1672 | #endif |
| 1673 | } |
| 1674 | } |
| 1675 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1676 | #ifdef _WIN32 |
| 1677 | /* destructively remove a trailing line terminator from s */ |
| 1678 | static void |
| 1679 | chomp (char *s) |
| 1680 | { |
| 1681 | size_t len; |
| 1682 | if (s && (len = strlen (s)) > 0 && s[len - 1] == '\n') { |
| 1683 | s[--len] = 0; |
| 1684 | if (len > 0 && s[len - 1] == '\r') |
| 1685 | s[--len] = 0; |
| 1686 | } |
| 1687 | } |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1688 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1689 | /* FormatMessage returns allocated strings, but evutil_socket_error_to_string |
| 1690 | * is supposed to return a string which is good indefinitely without having |
| 1691 | * to be freed. To make this work without leaking memory, we cache the |
| 1692 | * string the first time FormatMessage is called on a particular error |
| 1693 | * code, and then return the cached string on subsequent calls with the |
| 1694 | * same code. The strings aren't freed until libevent_global_shutdown |
| 1695 | * (or never). We use a linked list to cache the errors, because we |
| 1696 | * only expect there to be a few dozen, and that should be fast enough. |
| 1697 | */ |
Elliott Hughes | 2a572d1 | 2017-08-07 14:18:18 -0700 | [diff] [blame] | 1698 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1699 | struct cached_sock_errs_entry { |
| 1700 | HT_ENTRY(cached_sock_errs_entry) node; |
| 1701 | DWORD code; |
| 1702 | char *msg; /* allocated with LocalAlloc; free with LocalFree */ |
Josh Gao | 83a0c9c | 2017-08-10 12:30:25 -0700 | [diff] [blame] | 1703 | }; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1704 | |
| 1705 | static inline unsigned |
| 1706 | hash_cached_sock_errs(const struct cached_sock_errs_entry *e) |
| 1707 | { |
| 1708 | /* Use Murmur3's 32-bit finalizer as an integer hash function */ |
| 1709 | DWORD h = e->code; |
| 1710 | h ^= h >> 16; |
| 1711 | h *= 0x85ebca6b; |
| 1712 | h ^= h >> 13; |
| 1713 | h *= 0xc2b2ae35; |
| 1714 | h ^= h >> 16; |
| 1715 | return h; |
| 1716 | } |
| 1717 | |
| 1718 | static inline int |
| 1719 | eq_cached_sock_errs(const struct cached_sock_errs_entry *a, |
| 1720 | const struct cached_sock_errs_entry *b) |
| 1721 | { |
| 1722 | return a->code == b->code; |
| 1723 | } |
| 1724 | |
| 1725 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
| 1726 | static void *windows_socket_errors_lock_ = NULL; |
| 1727 | #endif |
| 1728 | |
| 1729 | static HT_HEAD(cached_sock_errs_map, cached_sock_errs_entry) |
| 1730 | windows_socket_errors = HT_INITIALIZER(); |
| 1731 | |
| 1732 | HT_PROTOTYPE(cached_sock_errs_map, |
| 1733 | cached_sock_errs_entry, |
| 1734 | node, |
| 1735 | hash_cached_sock_errs, |
| 1736 | eq_cached_sock_errs); |
| 1737 | |
| 1738 | HT_GENERATE(cached_sock_errs_map, |
| 1739 | cached_sock_errs_entry, |
| 1740 | node, |
| 1741 | hash_cached_sock_errs, |
| 1742 | eq_cached_sock_errs, |
| 1743 | 0.5, |
| 1744 | mm_malloc, |
| 1745 | mm_realloc, |
| 1746 | mm_free); |
| 1747 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1748 | /** Equivalent to strerror, but for windows socket errors. */ |
| 1749 | const char * |
| 1750 | evutil_socket_error_to_string(int errcode) |
| 1751 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1752 | struct cached_sock_errs_entry *errs, *newerr, find; |
| 1753 | char *msg = NULL; |
| 1754 | |
| 1755 | EVLOCK_LOCK(windows_socket_errors_lock_, 0); |
| 1756 | |
| 1757 | find.code = errcode; |
| 1758 | errs = HT_FIND(cached_sock_errs_map, &windows_socket_errors, &find); |
| 1759 | if (errs) { |
| 1760 | msg = errs->msg; |
| 1761 | goto done; |
| 1762 | } |
| 1763 | |
| 1764 | if (0 != FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | |
| 1765 | FORMAT_MESSAGE_IGNORE_INSERTS | |
| 1766 | FORMAT_MESSAGE_ALLOCATE_BUFFER, |
| 1767 | NULL, errcode, 0, (char *)&msg, 0, NULL)) |
| 1768 | chomp (msg); /* because message has trailing newline */ |
| 1769 | else { |
| 1770 | size_t len = 50; |
| 1771 | /* use LocalAlloc because FormatMessage does */ |
| 1772 | msg = LocalAlloc(LMEM_FIXED, len); |
| 1773 | if (!msg) { |
| 1774 | msg = (char *)"LocalAlloc failed during Winsock error"; |
| 1775 | goto done; |
| 1776 | } |
| 1777 | evutil_snprintf(msg, len, "winsock error 0x%08x", errcode); |
| 1778 | } |
| 1779 | |
| 1780 | newerr = (struct cached_sock_errs_entry *) |
| 1781 | mm_malloc(sizeof (struct cached_sock_errs_entry)); |
| 1782 | |
| 1783 | if (!newerr) { |
| 1784 | LocalFree(msg); |
| 1785 | msg = (char *)"malloc failed during Winsock error"; |
| 1786 | goto done; |
| 1787 | } |
| 1788 | |
| 1789 | newerr->code = errcode; |
| 1790 | newerr->msg = msg; |
| 1791 | HT_INSERT(cached_sock_errs_map, &windows_socket_errors, newerr); |
| 1792 | |
| 1793 | done: |
| 1794 | EVLOCK_UNLOCK(windows_socket_errors_lock_, 0); |
| 1795 | |
| 1796 | return msg; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1797 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1798 | |
| 1799 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
| 1800 | int |
| 1801 | evutil_global_setup_locks_(const int enable_locks) |
| 1802 | { |
| 1803 | EVTHREAD_SETUP_GLOBAL_LOCK(windows_socket_errors_lock_, 0); |
| 1804 | return 0; |
| 1805 | } |
| 1806 | #endif |
| 1807 | |
| 1808 | static void |
| 1809 | evutil_free_sock_err_globals(void) |
| 1810 | { |
| 1811 | struct cached_sock_errs_entry **errs, *tofree; |
| 1812 | |
| 1813 | for (errs = HT_START(cached_sock_errs_map, &windows_socket_errors) |
| 1814 | ; errs; ) { |
| 1815 | tofree = *errs; |
| 1816 | errs = HT_NEXT_RMV(cached_sock_errs_map, |
| 1817 | &windows_socket_errors, |
| 1818 | errs); |
| 1819 | LocalFree(tofree->msg); |
| 1820 | mm_free(tofree); |
| 1821 | } |
| 1822 | |
| 1823 | HT_CLEAR(cached_sock_errs_map, &windows_socket_errors); |
| 1824 | |
| 1825 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
| 1826 | if (windows_socket_errors_lock_ != NULL) { |
| 1827 | EVTHREAD_FREE_LOCK(windows_socket_errors_lock_, 0); |
| 1828 | windows_socket_errors_lock_ = NULL; |
| 1829 | } |
| 1830 | #endif |
| 1831 | } |
| 1832 | |
| 1833 | #else |
| 1834 | |
| 1835 | #ifndef EVENT__DISABLE_THREAD_SUPPORT |
| 1836 | int |
| 1837 | evutil_global_setup_locks_(const int enable_locks) |
| 1838 | { |
| 1839 | return 0; |
| 1840 | } |
| 1841 | #endif |
| 1842 | |
| 1843 | static void |
| 1844 | evutil_free_sock_err_globals(void) |
| 1845 | { |
| 1846 | } |
| 1847 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1848 | #endif |
| 1849 | |
| 1850 | int |
| 1851 | evutil_snprintf(char *buf, size_t buflen, const char *format, ...) |
| 1852 | { |
| 1853 | int r; |
| 1854 | va_list ap; |
| 1855 | va_start(ap, format); |
| 1856 | r = evutil_vsnprintf(buf, buflen, format, ap); |
| 1857 | va_end(ap); |
| 1858 | return r; |
| 1859 | } |
| 1860 | |
| 1861 | int |
| 1862 | evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap) |
| 1863 | { |
| 1864 | int r; |
| 1865 | if (!buflen) |
| 1866 | return 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1867 | #if defined(_MSC_VER) || defined(_WIN32) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1868 | r = _vsnprintf(buf, buflen, format, ap); |
| 1869 | if (r < 0) |
| 1870 | r = _vscprintf(format, ap); |
| 1871 | #elif defined(sgi) |
| 1872 | /* Make sure we always use the correct vsnprintf on IRIX */ |
| 1873 | extern int _xpg5_vsnprintf(char * __restrict, |
| 1874 | __SGI_LIBC_NAMESPACE_QUALIFIER size_t, |
| 1875 | const char * __restrict, /* va_list */ char *); |
| 1876 | |
| 1877 | r = _xpg5_vsnprintf(buf, buflen, format, ap); |
| 1878 | #else |
| 1879 | r = vsnprintf(buf, buflen, format, ap); |
| 1880 | #endif |
| 1881 | buf[buflen-1] = '\0'; |
| 1882 | return r; |
| 1883 | } |
| 1884 | |
| 1885 | #define USE_INTERNAL_NTOP |
| 1886 | #define USE_INTERNAL_PTON |
| 1887 | |
| 1888 | const char * |
| 1889 | evutil_inet_ntop(int af, const void *src, char *dst, size_t len) |
| 1890 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1891 | #if defined(EVENT__HAVE_INET_NTOP) && !defined(USE_INTERNAL_NTOP) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1892 | return inet_ntop(af, src, dst, len); |
| 1893 | #else |
| 1894 | if (af == AF_INET) { |
| 1895 | const struct in_addr *in = src; |
| 1896 | const ev_uint32_t a = ntohl(in->s_addr); |
| 1897 | int r; |
| 1898 | r = evutil_snprintf(dst, len, "%d.%d.%d.%d", |
| 1899 | (int)(ev_uint8_t)((a>>24)&0xff), |
| 1900 | (int)(ev_uint8_t)((a>>16)&0xff), |
| 1901 | (int)(ev_uint8_t)((a>>8 )&0xff), |
| 1902 | (int)(ev_uint8_t)((a )&0xff)); |
| 1903 | if (r<0||(size_t)r>=len) |
| 1904 | return NULL; |
| 1905 | else |
| 1906 | return dst; |
| 1907 | #ifdef AF_INET6 |
| 1908 | } else if (af == AF_INET6) { |
| 1909 | const struct in6_addr *addr = src; |
| 1910 | char buf[64], *cp; |
| 1911 | int longestGapLen = 0, longestGapPos = -1, i, |
| 1912 | curGapPos = -1, curGapLen = 0; |
| 1913 | ev_uint16_t words[8]; |
| 1914 | for (i = 0; i < 8; ++i) { |
| 1915 | words[i] = |
| 1916 | (((ev_uint16_t)addr->s6_addr[2*i])<<8) + addr->s6_addr[2*i+1]; |
| 1917 | } |
| 1918 | if (words[0] == 0 && words[1] == 0 && words[2] == 0 && words[3] == 0 && |
| 1919 | words[4] == 0 && ((words[5] == 0 && words[6] && words[7]) || |
| 1920 | (words[5] == 0xffff))) { |
| 1921 | /* This is an IPv4 address. */ |
| 1922 | if (words[5] == 0) { |
| 1923 | evutil_snprintf(buf, sizeof(buf), "::%d.%d.%d.%d", |
| 1924 | addr->s6_addr[12], addr->s6_addr[13], |
| 1925 | addr->s6_addr[14], addr->s6_addr[15]); |
| 1926 | } else { |
| 1927 | evutil_snprintf(buf, sizeof(buf), "::%x:%d.%d.%d.%d", words[5], |
| 1928 | addr->s6_addr[12], addr->s6_addr[13], |
| 1929 | addr->s6_addr[14], addr->s6_addr[15]); |
| 1930 | } |
| 1931 | if (strlen(buf) > len) |
| 1932 | return NULL; |
| 1933 | strlcpy(dst, buf, len); |
| 1934 | return dst; |
| 1935 | } |
| 1936 | i = 0; |
| 1937 | while (i < 8) { |
| 1938 | if (words[i] == 0) { |
| 1939 | curGapPos = i++; |
| 1940 | curGapLen = 1; |
| 1941 | while (i<8 && words[i] == 0) { |
| 1942 | ++i; ++curGapLen; |
| 1943 | } |
| 1944 | if (curGapLen > longestGapLen) { |
| 1945 | longestGapPos = curGapPos; |
| 1946 | longestGapLen = curGapLen; |
| 1947 | } |
| 1948 | } else { |
| 1949 | ++i; |
| 1950 | } |
| 1951 | } |
| 1952 | if (longestGapLen<=1) |
| 1953 | longestGapPos = -1; |
| 1954 | |
| 1955 | cp = buf; |
| 1956 | for (i = 0; i < 8; ++i) { |
| 1957 | if (words[i] == 0 && longestGapPos == i) { |
| 1958 | if (i == 0) |
| 1959 | *cp++ = ':'; |
| 1960 | *cp++ = ':'; |
| 1961 | while (i < 8 && words[i] == 0) |
| 1962 | ++i; |
| 1963 | --i; /* to compensate for loop increment. */ |
| 1964 | } else { |
| 1965 | evutil_snprintf(cp, |
| 1966 | sizeof(buf)-(cp-buf), "%x", (unsigned)words[i]); |
| 1967 | cp += strlen(cp); |
| 1968 | if (i != 7) |
| 1969 | *cp++ = ':'; |
| 1970 | } |
| 1971 | } |
| 1972 | *cp = '\0'; |
| 1973 | if (strlen(buf) > len) |
| 1974 | return NULL; |
| 1975 | strlcpy(dst, buf, len); |
| 1976 | return dst; |
| 1977 | #endif |
| 1978 | } else { |
| 1979 | return NULL; |
| 1980 | } |
| 1981 | #endif |
| 1982 | } |
| 1983 | |
| 1984 | int |
| 1985 | evutil_inet_pton(int af, const char *src, void *dst) |
| 1986 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1987 | #if defined(EVENT__HAVE_INET_PTON) && !defined(USE_INTERNAL_PTON) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1988 | return inet_pton(af, src, dst); |
| 1989 | #else |
| 1990 | if (af == AF_INET) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1991 | unsigned a,b,c,d; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1992 | char more; |
| 1993 | struct in_addr *addr = dst; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1994 | if (sscanf(src, "%u.%u.%u.%u%c", &a,&b,&c,&d,&more) != 4) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1995 | return 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 1996 | if (a > 255) return 0; |
| 1997 | if (b > 255) return 0; |
| 1998 | if (c > 255) return 0; |
| 1999 | if (d > 255) return 0; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2000 | addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d); |
| 2001 | return 1; |
| 2002 | #ifdef AF_INET6 |
| 2003 | } else if (af == AF_INET6) { |
| 2004 | struct in6_addr *out = dst; |
| 2005 | ev_uint16_t words[8]; |
| 2006 | int gapPos = -1, i, setWords=0; |
| 2007 | const char *dot = strchr(src, '.'); |
| 2008 | const char *eow; /* end of words. */ |
| 2009 | if (dot == src) |
| 2010 | return 0; |
| 2011 | else if (!dot) |
| 2012 | eow = src+strlen(src); |
| 2013 | else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2014 | unsigned byte1,byte2,byte3,byte4; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2015 | char more; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2016 | for (eow = dot-1; eow >= src && EVUTIL_ISDIGIT_(*eow); --eow) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2017 | ; |
| 2018 | ++eow; |
| 2019 | |
| 2020 | /* We use "scanf" because some platform inet_aton()s are too lax |
| 2021 | * about IPv4 addresses of the form "1.2.3" */ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2022 | if (sscanf(eow, "%u.%u.%u.%u%c", |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2023 | &byte1,&byte2,&byte3,&byte4,&more) != 4) |
| 2024 | return 0; |
| 2025 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2026 | if (byte1 > 255 || |
| 2027 | byte2 > 255 || |
| 2028 | byte3 > 255 || |
| 2029 | byte4 > 255) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2030 | return 0; |
| 2031 | |
| 2032 | words[6] = (byte1<<8) | byte2; |
| 2033 | words[7] = (byte3<<8) | byte4; |
| 2034 | setWords += 2; |
| 2035 | } |
| 2036 | |
| 2037 | i = 0; |
| 2038 | while (src < eow) { |
| 2039 | if (i > 7) |
| 2040 | return 0; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2041 | if (EVUTIL_ISXDIGIT_(*src)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2042 | char *next; |
| 2043 | long r = strtol(src, &next, 16); |
| 2044 | if (next > 4+src) |
| 2045 | return 0; |
| 2046 | if (next == src) |
| 2047 | return 0; |
| 2048 | if (r<0 || r>65536) |
| 2049 | return 0; |
| 2050 | |
| 2051 | words[i++] = (ev_uint16_t)r; |
| 2052 | setWords++; |
| 2053 | src = next; |
| 2054 | if (*src != ':' && src != eow) |
| 2055 | return 0; |
| 2056 | ++src; |
| 2057 | } else if (*src == ':' && i > 0 && gapPos==-1) { |
| 2058 | gapPos = i; |
| 2059 | ++src; |
| 2060 | } else if (*src == ':' && i == 0 && src[1] == ':' && gapPos==-1) { |
| 2061 | gapPos = i; |
| 2062 | src += 2; |
| 2063 | } else { |
| 2064 | return 0; |
| 2065 | } |
| 2066 | } |
| 2067 | |
| 2068 | if (setWords > 8 || |
| 2069 | (setWords == 8 && gapPos != -1) || |
| 2070 | (setWords < 8 && gapPos == -1)) |
| 2071 | return 0; |
| 2072 | |
| 2073 | if (gapPos >= 0) { |
| 2074 | int nToMove = setWords - (dot ? 2 : 0) - gapPos; |
| 2075 | int gapLen = 8 - setWords; |
| 2076 | /* assert(nToMove >= 0); */ |
| 2077 | if (nToMove < 0) |
| 2078 | return -1; /* should be impossible */ |
| 2079 | memmove(&words[gapPos+gapLen], &words[gapPos], |
| 2080 | sizeof(ev_uint16_t)*nToMove); |
| 2081 | memset(&words[gapPos], 0, sizeof(ev_uint16_t)*gapLen); |
| 2082 | } |
| 2083 | for (i = 0; i < 8; ++i) { |
| 2084 | out->s6_addr[2*i ] = words[i] >> 8; |
| 2085 | out->s6_addr[2*i+1] = words[i] & 0xff; |
| 2086 | } |
| 2087 | |
| 2088 | return 1; |
| 2089 | #endif |
| 2090 | } else { |
| 2091 | return -1; |
| 2092 | } |
| 2093 | #endif |
| 2094 | } |
| 2095 | |
| 2096 | int |
| 2097 | evutil_parse_sockaddr_port(const char *ip_as_string, struct sockaddr *out, int *outlen) |
| 2098 | { |
| 2099 | int port; |
| 2100 | char buf[128]; |
| 2101 | const char *cp, *addr_part, *port_part; |
| 2102 | int is_ipv6; |
| 2103 | /* recognized formats are: |
| 2104 | * [ipv6]:port |
| 2105 | * ipv6 |
| 2106 | * [ipv6] |
| 2107 | * ipv4:port |
| 2108 | * ipv4 |
| 2109 | */ |
| 2110 | |
| 2111 | cp = strchr(ip_as_string, ':'); |
| 2112 | if (*ip_as_string == '[') { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2113 | size_t len; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2114 | if (!(cp = strchr(ip_as_string, ']'))) { |
| 2115 | return -1; |
| 2116 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2117 | len = ( cp-(ip_as_string + 1) ); |
| 2118 | if (len > sizeof(buf)-1) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2119 | return -1; |
| 2120 | } |
| 2121 | memcpy(buf, ip_as_string+1, len); |
| 2122 | buf[len] = '\0'; |
| 2123 | addr_part = buf; |
| 2124 | if (cp[1] == ':') |
| 2125 | port_part = cp+2; |
| 2126 | else |
| 2127 | port_part = NULL; |
| 2128 | is_ipv6 = 1; |
| 2129 | } else if (cp && strchr(cp+1, ':')) { |
| 2130 | is_ipv6 = 1; |
| 2131 | addr_part = ip_as_string; |
| 2132 | port_part = NULL; |
| 2133 | } else if (cp) { |
| 2134 | is_ipv6 = 0; |
| 2135 | if (cp - ip_as_string > (int)sizeof(buf)-1) { |
| 2136 | return -1; |
| 2137 | } |
| 2138 | memcpy(buf, ip_as_string, cp-ip_as_string); |
| 2139 | buf[cp-ip_as_string] = '\0'; |
| 2140 | addr_part = buf; |
| 2141 | port_part = cp+1; |
| 2142 | } else { |
| 2143 | addr_part = ip_as_string; |
| 2144 | port_part = NULL; |
| 2145 | is_ipv6 = 0; |
| 2146 | } |
| 2147 | |
| 2148 | if (port_part == NULL) { |
| 2149 | port = 0; |
| 2150 | } else { |
| 2151 | port = atoi(port_part); |
| 2152 | if (port <= 0 || port > 65535) { |
| 2153 | return -1; |
| 2154 | } |
| 2155 | } |
| 2156 | |
| 2157 | if (!addr_part) |
| 2158 | return -1; /* Should be impossible. */ |
| 2159 | #ifdef AF_INET6 |
| 2160 | if (is_ipv6) |
| 2161 | { |
| 2162 | struct sockaddr_in6 sin6; |
| 2163 | memset(&sin6, 0, sizeof(sin6)); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2164 | #ifdef EVENT__HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2165 | sin6.sin6_len = sizeof(sin6); |
| 2166 | #endif |
| 2167 | sin6.sin6_family = AF_INET6; |
| 2168 | sin6.sin6_port = htons(port); |
| 2169 | if (1 != evutil_inet_pton(AF_INET6, addr_part, &sin6.sin6_addr)) |
| 2170 | return -1; |
| 2171 | if ((int)sizeof(sin6) > *outlen) |
| 2172 | return -1; |
| 2173 | memset(out, 0, *outlen); |
| 2174 | memcpy(out, &sin6, sizeof(sin6)); |
| 2175 | *outlen = sizeof(sin6); |
| 2176 | return 0; |
| 2177 | } |
| 2178 | else |
| 2179 | #endif |
| 2180 | { |
| 2181 | struct sockaddr_in sin; |
| 2182 | memset(&sin, 0, sizeof(sin)); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2183 | #ifdef EVENT__HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2184 | sin.sin_len = sizeof(sin); |
| 2185 | #endif |
| 2186 | sin.sin_family = AF_INET; |
| 2187 | sin.sin_port = htons(port); |
| 2188 | if (1 != evutil_inet_pton(AF_INET, addr_part, &sin.sin_addr)) |
| 2189 | return -1; |
| 2190 | if ((int)sizeof(sin) > *outlen) |
| 2191 | return -1; |
| 2192 | memset(out, 0, *outlen); |
| 2193 | memcpy(out, &sin, sizeof(sin)); |
| 2194 | *outlen = sizeof(sin); |
| 2195 | return 0; |
| 2196 | } |
| 2197 | } |
| 2198 | |
| 2199 | const char * |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2200 | evutil_format_sockaddr_port_(const struct sockaddr *sa, char *out, size_t outlen) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2201 | { |
| 2202 | char b[128]; |
| 2203 | const char *res=NULL; |
| 2204 | int port; |
| 2205 | if (sa->sa_family == AF_INET) { |
| 2206 | const struct sockaddr_in *sin = (const struct sockaddr_in*)sa; |
| 2207 | res = evutil_inet_ntop(AF_INET, &sin->sin_addr,b,sizeof(b)); |
| 2208 | port = ntohs(sin->sin_port); |
| 2209 | if (res) { |
| 2210 | evutil_snprintf(out, outlen, "%s:%d", b, port); |
| 2211 | return out; |
| 2212 | } |
| 2213 | } else if (sa->sa_family == AF_INET6) { |
| 2214 | const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6*)sa; |
| 2215 | res = evutil_inet_ntop(AF_INET6, &sin6->sin6_addr,b,sizeof(b)); |
| 2216 | port = ntohs(sin6->sin6_port); |
| 2217 | if (res) { |
| 2218 | evutil_snprintf(out, outlen, "[%s]:%d", b, port); |
| 2219 | return out; |
| 2220 | } |
| 2221 | } |
| 2222 | |
| 2223 | evutil_snprintf(out, outlen, "<addr with socktype %d>", |
| 2224 | (int)sa->sa_family); |
| 2225 | return out; |
| 2226 | } |
| 2227 | |
| 2228 | int |
| 2229 | evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2, |
| 2230 | int include_port) |
| 2231 | { |
| 2232 | int r; |
| 2233 | if (0 != (r = (sa1->sa_family - sa2->sa_family))) |
| 2234 | return r; |
| 2235 | |
| 2236 | if (sa1->sa_family == AF_INET) { |
| 2237 | const struct sockaddr_in *sin1, *sin2; |
| 2238 | sin1 = (const struct sockaddr_in *)sa1; |
| 2239 | sin2 = (const struct sockaddr_in *)sa2; |
| 2240 | if (sin1->sin_addr.s_addr < sin2->sin_addr.s_addr) |
| 2241 | return -1; |
| 2242 | else if (sin1->sin_addr.s_addr > sin2->sin_addr.s_addr) |
| 2243 | return 1; |
| 2244 | else if (include_port && |
| 2245 | (r = ((int)sin1->sin_port - (int)sin2->sin_port))) |
| 2246 | return r; |
| 2247 | else |
| 2248 | return 0; |
| 2249 | } |
| 2250 | #ifdef AF_INET6 |
| 2251 | else if (sa1->sa_family == AF_INET6) { |
| 2252 | const struct sockaddr_in6 *sin1, *sin2; |
| 2253 | sin1 = (const struct sockaddr_in6 *)sa1; |
| 2254 | sin2 = (const struct sockaddr_in6 *)sa2; |
| 2255 | if ((r = memcmp(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16))) |
| 2256 | return r; |
| 2257 | else if (include_port && |
| 2258 | (r = ((int)sin1->sin6_port - (int)sin2->sin6_port))) |
| 2259 | return r; |
| 2260 | else |
| 2261 | return 0; |
| 2262 | } |
| 2263 | #endif |
| 2264 | return 1; |
| 2265 | } |
| 2266 | |
| 2267 | /* Tables to implement ctypes-replacement EVUTIL_IS*() functions. Each table |
| 2268 | * has 256 bits to look up whether a character is in some set or not. This |
| 2269 | * fails on non-ASCII platforms, but so does every other place where we |
| 2270 | * take a char and write it onto the network. |
| 2271 | **/ |
| 2272 | static const ev_uint32_t EVUTIL_ISALPHA_TABLE[8] = |
| 2273 | { 0, 0, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 }; |
| 2274 | static const ev_uint32_t EVUTIL_ISALNUM_TABLE[8] = |
| 2275 | { 0, 0x3ff0000, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 }; |
| 2276 | static const ev_uint32_t EVUTIL_ISSPACE_TABLE[8] = { 0x3e00, 0x1, 0, 0, 0, 0, 0, 0 }; |
| 2277 | static const ev_uint32_t EVUTIL_ISXDIGIT_TABLE[8] = |
| 2278 | { 0, 0x3ff0000, 0x7e, 0x7e, 0, 0, 0, 0 }; |
| 2279 | static const ev_uint32_t EVUTIL_ISDIGIT_TABLE[8] = { 0, 0x3ff0000, 0, 0, 0, 0, 0, 0 }; |
| 2280 | static const ev_uint32_t EVUTIL_ISPRINT_TABLE[8] = |
| 2281 | { 0, 0xffffffff, 0xffffffff, 0x7fffffff, 0, 0, 0, 0x0 }; |
| 2282 | static const ev_uint32_t EVUTIL_ISUPPER_TABLE[8] = { 0, 0, 0x7fffffe, 0, 0, 0, 0, 0 }; |
| 2283 | static const ev_uint32_t EVUTIL_ISLOWER_TABLE[8] = { 0, 0, 0, 0x7fffffe, 0, 0, 0, 0 }; |
| 2284 | /* Upper-casing and lowercasing tables to map characters to upper/lowercase |
| 2285 | * equivalents. */ |
| 2286 | static const unsigned char EVUTIL_TOUPPER_TABLE[256] = { |
| 2287 | 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, |
| 2288 | 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31, |
| 2289 | 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47, |
| 2290 | 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63, |
| 2291 | 64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79, |
| 2292 | 80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95, |
| 2293 | 96,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79, |
| 2294 | 80,81,82,83,84,85,86,87,88,89,90,123,124,125,126,127, |
| 2295 | 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, |
| 2296 | 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, |
| 2297 | 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175, |
| 2298 | 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, |
| 2299 | 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207, |
| 2300 | 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223, |
| 2301 | 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239, |
| 2302 | 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, |
| 2303 | }; |
| 2304 | static const unsigned char EVUTIL_TOLOWER_TABLE[256] = { |
| 2305 | 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, |
| 2306 | 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31, |
| 2307 | 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47, |
| 2308 | 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63, |
| 2309 | 64,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111, |
| 2310 | 112,113,114,115,116,117,118,119,120,121,122,91,92,93,94,95, |
| 2311 | 96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111, |
| 2312 | 112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127, |
| 2313 | 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, |
| 2314 | 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, |
| 2315 | 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175, |
| 2316 | 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, |
| 2317 | 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207, |
| 2318 | 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223, |
| 2319 | 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239, |
| 2320 | 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, |
| 2321 | }; |
| 2322 | |
| 2323 | #define IMPL_CTYPE_FN(name) \ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2324 | int EVUTIL_##name##_(char c) { \ |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2325 | ev_uint8_t u = c; \ |
| 2326 | return !!(EVUTIL_##name##_TABLE[(u >> 5) & 7] & (1 << (u & 31))); \ |
| 2327 | } |
| 2328 | IMPL_CTYPE_FN(ISALPHA) |
| 2329 | IMPL_CTYPE_FN(ISALNUM) |
| 2330 | IMPL_CTYPE_FN(ISSPACE) |
| 2331 | IMPL_CTYPE_FN(ISDIGIT) |
| 2332 | IMPL_CTYPE_FN(ISXDIGIT) |
| 2333 | IMPL_CTYPE_FN(ISPRINT) |
| 2334 | IMPL_CTYPE_FN(ISLOWER) |
| 2335 | IMPL_CTYPE_FN(ISUPPER) |
| 2336 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2337 | char EVUTIL_TOLOWER_(char c) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2338 | { |
| 2339 | return ((char)EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c]); |
| 2340 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2341 | char EVUTIL_TOUPPER_(char c) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2342 | { |
| 2343 | return ((char)EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c]); |
| 2344 | } |
| 2345 | int |
| 2346 | evutil_ascii_strcasecmp(const char *s1, const char *s2) |
| 2347 | { |
| 2348 | char c1, c2; |
| 2349 | while (1) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2350 | c1 = EVUTIL_TOLOWER_(*s1++); |
| 2351 | c2 = EVUTIL_TOLOWER_(*s2++); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2352 | if (c1 < c2) |
| 2353 | return -1; |
| 2354 | else if (c1 > c2) |
| 2355 | return 1; |
| 2356 | else if (c1 == 0) |
| 2357 | return 0; |
| 2358 | } |
| 2359 | } |
| 2360 | int evutil_ascii_strncasecmp(const char *s1, const char *s2, size_t n) |
| 2361 | { |
| 2362 | char c1, c2; |
| 2363 | while (n--) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2364 | c1 = EVUTIL_TOLOWER_(*s1++); |
| 2365 | c2 = EVUTIL_TOLOWER_(*s2++); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2366 | if (c1 < c2) |
| 2367 | return -1; |
| 2368 | else if (c1 > c2) |
| 2369 | return 1; |
| 2370 | else if (c1 == 0) |
| 2371 | return 0; |
| 2372 | } |
| 2373 | return 0; |
| 2374 | } |
| 2375 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2376 | void |
| 2377 | evutil_rtrim_lws_(char *str) |
| 2378 | { |
| 2379 | char *cp; |
| 2380 | |
| 2381 | if (str == NULL) |
| 2382 | return; |
| 2383 | |
| 2384 | if ((cp = strchr(str, '\0')) == NULL || (cp == str)) |
| 2385 | return; |
| 2386 | |
| 2387 | --cp; |
| 2388 | |
| 2389 | while (*cp == ' ' || *cp == '\t') { |
| 2390 | *cp = '\0'; |
| 2391 | if (cp == str) |
| 2392 | break; |
| 2393 | --cp; |
| 2394 | } |
| 2395 | } |
| 2396 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2397 | static int |
| 2398 | evutil_issetugid(void) |
| 2399 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2400 | #ifdef EVENT__HAVE_ISSETUGID |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2401 | return issetugid(); |
| 2402 | #else |
| 2403 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2404 | #ifdef EVENT__HAVE_GETEUID |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2405 | if (getuid() != geteuid()) |
| 2406 | return 1; |
| 2407 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2408 | #ifdef EVENT__HAVE_GETEGID |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2409 | if (getgid() != getegid()) |
| 2410 | return 1; |
| 2411 | #endif |
| 2412 | return 0; |
| 2413 | #endif |
| 2414 | } |
| 2415 | |
| 2416 | const char * |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2417 | evutil_getenv_(const char *varname) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2418 | { |
| 2419 | if (evutil_issetugid()) |
| 2420 | return NULL; |
| 2421 | |
| 2422 | return getenv(varname); |
| 2423 | } |
| 2424 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2425 | ev_uint32_t |
| 2426 | evutil_weakrand_seed_(struct evutil_weakrand_state *state, ev_uint32_t seed) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2427 | { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2428 | if (seed == 0) { |
| 2429 | struct timeval tv; |
| 2430 | evutil_gettimeofday(&tv, NULL); |
| 2431 | seed = (ev_uint32_t)tv.tv_sec + (ev_uint32_t)tv.tv_usec; |
| 2432 | #ifdef _WIN32 |
| 2433 | seed += (ev_uint32_t) _getpid(); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2434 | #else |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2435 | seed += (ev_uint32_t) getpid(); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2436 | #endif |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2437 | } |
| 2438 | state->seed = seed; |
| 2439 | return seed; |
| 2440 | } |
| 2441 | |
| 2442 | ev_int32_t |
| 2443 | evutil_weakrand_(struct evutil_weakrand_state *state) |
| 2444 | { |
| 2445 | /* This RNG implementation is a linear congruential generator, with |
| 2446 | * modulus 2^31, multiplier 1103515245, and addend 12345. It's also |
| 2447 | * used by OpenBSD, and by Glibc's TYPE_0 RNG. |
| 2448 | * |
| 2449 | * The linear congruential generator is not an industrial-strength |
| 2450 | * RNG! It's fast, but it can have higher-order patterns. Notably, |
| 2451 | * the low bits tend to have periodicity. |
| 2452 | */ |
| 2453 | state->seed = ((state->seed) * 1103515245 + 12345) & 0x7fffffff; |
| 2454 | return (ev_int32_t)(state->seed); |
| 2455 | } |
| 2456 | |
| 2457 | ev_int32_t |
| 2458 | evutil_weakrand_range_(struct evutil_weakrand_state *state, ev_int32_t top) |
| 2459 | { |
| 2460 | ev_int32_t divisor, result; |
| 2461 | |
| 2462 | /* We can't just do weakrand() % top, since the low bits of the LCG |
| 2463 | * are less random than the high ones. (Specifically, since the LCG |
| 2464 | * modulus is 2^N, every 2^m for m<N will divide the modulus, and so |
| 2465 | * therefore the low m bits of the LCG will have period 2^m.) */ |
| 2466 | divisor = EVUTIL_WEAKRAND_MAX / top; |
| 2467 | do { |
| 2468 | result = evutil_weakrand_(state) / divisor; |
| 2469 | } while (result >= top); |
| 2470 | return result; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2471 | } |
| 2472 | |
| 2473 | /** |
| 2474 | * Volatile pointer to memset: we use this to keep the compiler from |
| 2475 | * eliminating our call to memset. |
| 2476 | */ |
| 2477 | void * (*volatile evutil_memset_volatile_)(void *, int, size_t) = memset; |
| 2478 | |
| 2479 | void |
| 2480 | evutil_memclear_(void *mem, size_t len) |
| 2481 | { |
| 2482 | evutil_memset_volatile_(mem, 0, len); |
| 2483 | } |
| 2484 | |
| 2485 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2486 | evutil_sockaddr_is_loopback_(const struct sockaddr *addr) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2487 | { |
| 2488 | static const char LOOPBACK_S6[16] = |
| 2489 | "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1"; |
| 2490 | if (addr->sa_family == AF_INET) { |
| 2491 | struct sockaddr_in *sin = (struct sockaddr_in *)addr; |
| 2492 | return (ntohl(sin->sin_addr.s_addr) & 0xff000000) == 0x7f000000; |
| 2493 | } else if (addr->sa_family == AF_INET6) { |
| 2494 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr; |
| 2495 | return !memcmp(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16); |
| 2496 | } |
| 2497 | return 0; |
| 2498 | } |
| 2499 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2500 | int |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2501 | evutil_hex_char_to_int_(char c) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2502 | { |
| 2503 | switch(c) |
| 2504 | { |
| 2505 | case '0': return 0; |
| 2506 | case '1': return 1; |
| 2507 | case '2': return 2; |
| 2508 | case '3': return 3; |
| 2509 | case '4': return 4; |
| 2510 | case '5': return 5; |
| 2511 | case '6': return 6; |
| 2512 | case '7': return 7; |
| 2513 | case '8': return 8; |
| 2514 | case '9': return 9; |
| 2515 | case 'A': case 'a': return 10; |
| 2516 | case 'B': case 'b': return 11; |
| 2517 | case 'C': case 'c': return 12; |
| 2518 | case 'D': case 'd': return 13; |
| 2519 | case 'E': case 'e': return 14; |
| 2520 | case 'F': case 'f': return 15; |
| 2521 | } |
| 2522 | return -1; |
| 2523 | } |
| 2524 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2525 | #ifdef _WIN32 |
| 2526 | HMODULE |
| 2527 | evutil_load_windows_system_library_(const TCHAR *library_name) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 2528 | { |
| 2529 | TCHAR path[MAX_PATH]; |
| 2530 | unsigned n; |
| 2531 | n = GetSystemDirectory(path, MAX_PATH); |
| 2532 | if (n == 0 || n + _tcslen(library_name) + 2 >= MAX_PATH) |
| 2533 | return 0; |
| 2534 | _tcscat(path, TEXT("\\")); |
| 2535 | _tcscat(path, library_name); |
| 2536 | return LoadLibrary(path); |
| 2537 | } |
| 2538 | #endif |
| 2539 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2540 | /* Internal wrapper around 'socket' to provide Linux-style support for |
| 2541 | * syscall-saving methods where available. |
| 2542 | * |
| 2543 | * In addition to regular socket behavior, you can use a bitwise or to set the |
| 2544 | * flags EVUTIL_SOCK_NONBLOCK and EVUTIL_SOCK_CLOEXEC in the 'type' argument, |
| 2545 | * to make the socket nonblocking or close-on-exec with as few syscalls as |
| 2546 | * possible. |
| 2547 | */ |
| 2548 | evutil_socket_t |
| 2549 | evutil_socket_(int domain, int type, int protocol) |
| 2550 | { |
| 2551 | evutil_socket_t r; |
| 2552 | #if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC) |
| 2553 | r = socket(domain, type, protocol); |
| 2554 | if (r >= 0) |
| 2555 | return r; |
| 2556 | else if ((type & (SOCK_NONBLOCK|SOCK_CLOEXEC)) == 0) |
| 2557 | return -1; |
| 2558 | #endif |
| 2559 | #define SOCKET_TYPE_MASK (~(EVUTIL_SOCK_NONBLOCK|EVUTIL_SOCK_CLOEXEC)) |
| 2560 | r = socket(domain, type & SOCKET_TYPE_MASK, protocol); |
| 2561 | if (r < 0) |
| 2562 | return -1; |
| 2563 | if (type & EVUTIL_SOCK_NONBLOCK) { |
| 2564 | if (evutil_fast_socket_nonblocking(r) < 0) { |
| 2565 | evutil_closesocket(r); |
| 2566 | return -1; |
| 2567 | } |
| 2568 | } |
| 2569 | if (type & EVUTIL_SOCK_CLOEXEC) { |
| 2570 | if (evutil_fast_socket_closeonexec(r) < 0) { |
| 2571 | evutil_closesocket(r); |
| 2572 | return -1; |
| 2573 | } |
| 2574 | } |
| 2575 | return r; |
| 2576 | } |
| 2577 | |
| 2578 | /* Internal wrapper around 'accept' or 'accept4' to provide Linux-style |
| 2579 | * support for syscall-saving methods where available. |
| 2580 | * |
| 2581 | * In addition to regular accept behavior, you can set one or more of flags |
| 2582 | * EVUTIL_SOCK_NONBLOCK and EVUTIL_SOCK_CLOEXEC in the 'flags' argument, to |
| 2583 | * make the socket nonblocking or close-on-exec with as few syscalls as |
| 2584 | * possible. |
| 2585 | */ |
| 2586 | evutil_socket_t |
| 2587 | evutil_accept4_(evutil_socket_t sockfd, struct sockaddr *addr, |
| 2588 | ev_socklen_t *addrlen, int flags) |
| 2589 | { |
| 2590 | evutil_socket_t result; |
| 2591 | #if defined(EVENT__HAVE_ACCEPT4) && defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK) |
| 2592 | result = accept4(sockfd, addr, addrlen, flags); |
| 2593 | if (result >= 0 || (errno != EINVAL && errno != ENOSYS)) { |
| 2594 | /* A nonnegative result means that we succeeded, so return. |
| 2595 | * Failing with EINVAL means that an option wasn't supported, |
| 2596 | * and failing with ENOSYS means that the syscall wasn't |
| 2597 | * there: in those cases we want to fall back. Otherwise, we |
| 2598 | * got a real error, and we should return. */ |
| 2599 | return result; |
| 2600 | } |
| 2601 | #endif |
| 2602 | result = accept(sockfd, addr, addrlen); |
| 2603 | if (result < 0) |
| 2604 | return result; |
| 2605 | |
| 2606 | if (flags & EVUTIL_SOCK_CLOEXEC) { |
| 2607 | if (evutil_fast_socket_closeonexec(result) < 0) { |
| 2608 | evutil_closesocket(result); |
| 2609 | return -1; |
| 2610 | } |
| 2611 | } |
| 2612 | if (flags & EVUTIL_SOCK_NONBLOCK) { |
| 2613 | if (evutil_fast_socket_nonblocking(result) < 0) { |
| 2614 | evutil_closesocket(result); |
| 2615 | return -1; |
| 2616 | } |
| 2617 | } |
| 2618 | return result; |
| 2619 | } |
| 2620 | |
| 2621 | /* Internal function: Set fd[0] and fd[1] to a pair of fds such that writes on |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 2622 | * fd[1] get read from fd[0]. Make both fds nonblocking and close-on-exec. |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 2623 | * Return 0 on success, -1 on failure. |
| 2624 | */ |
| 2625 | int |
| 2626 | evutil_make_internal_pipe_(evutil_socket_t fd[2]) |
| 2627 | { |
| 2628 | /* |
| 2629 | Making the second socket nonblocking is a bit subtle, given that we |
| 2630 | ignore any EAGAIN returns when writing to it, and you don't usally |
| 2631 | do that for a nonblocking socket. But if the kernel gives us EAGAIN, |
| 2632 | then there's no need to add any more data to the buffer, since |
| 2633 | the main thread is already either about to wake up and drain it, |
| 2634 | or woken up and in the process of draining it. |
| 2635 | */ |
| 2636 | |
| 2637 | #if defined(EVENT__HAVE_PIPE2) |
| 2638 | if (pipe2(fd, O_NONBLOCK|O_CLOEXEC) == 0) |
| 2639 | return 0; |
| 2640 | #endif |
| 2641 | #if defined(EVENT__HAVE_PIPE) |
| 2642 | if (pipe(fd) == 0) { |
| 2643 | if (evutil_fast_socket_nonblocking(fd[0]) < 0 || |
| 2644 | evutil_fast_socket_nonblocking(fd[1]) < 0 || |
| 2645 | evutil_fast_socket_closeonexec(fd[0]) < 0 || |
| 2646 | evutil_fast_socket_closeonexec(fd[1]) < 0) { |
| 2647 | close(fd[0]); |
| 2648 | close(fd[1]); |
| 2649 | fd[0] = fd[1] = -1; |
| 2650 | return -1; |
| 2651 | } |
| 2652 | return 0; |
| 2653 | } else { |
| 2654 | event_warn("%s: pipe", __func__); |
| 2655 | } |
| 2656 | #endif |
| 2657 | |
| 2658 | #ifdef _WIN32 |
| 2659 | #define LOCAL_SOCKETPAIR_AF AF_INET |
| 2660 | #else |
| 2661 | #define LOCAL_SOCKETPAIR_AF AF_UNIX |
| 2662 | #endif |
| 2663 | if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, fd) == 0) { |
| 2664 | if (evutil_fast_socket_nonblocking(fd[0]) < 0 || |
| 2665 | evutil_fast_socket_nonblocking(fd[1]) < 0 || |
| 2666 | evutil_fast_socket_closeonexec(fd[0]) < 0 || |
| 2667 | evutil_fast_socket_closeonexec(fd[1]) < 0) { |
| 2668 | evutil_closesocket(fd[0]); |
| 2669 | evutil_closesocket(fd[1]); |
| 2670 | fd[0] = fd[1] = -1; |
| 2671 | return -1; |
| 2672 | } |
| 2673 | return 0; |
| 2674 | } |
| 2675 | fd[0] = fd[1] = -1; |
| 2676 | return -1; |
| 2677 | } |
| 2678 | |
| 2679 | /* Wrapper around eventfd on systems that provide it. Unlike the system |
| 2680 | * eventfd, it always supports EVUTIL_EFD_CLOEXEC and EVUTIL_EFD_NONBLOCK as |
| 2681 | * flags. Returns -1 on error or if eventfd is not supported. |
| 2682 | */ |
| 2683 | evutil_socket_t |
| 2684 | evutil_eventfd_(unsigned initval, int flags) |
| 2685 | { |
| 2686 | #if defined(EVENT__HAVE_EVENTFD) && defined(EVENT__HAVE_SYS_EVENTFD_H) |
| 2687 | int r; |
| 2688 | #if defined(EFD_CLOEXEC) && defined(EFD_NONBLOCK) |
| 2689 | r = eventfd(initval, flags); |
| 2690 | if (r >= 0 || flags == 0) |
| 2691 | return r; |
| 2692 | #endif |
| 2693 | r = eventfd(initval, 0); |
| 2694 | if (r < 0) |
| 2695 | return r; |
| 2696 | if (flags & EVUTIL_EFD_CLOEXEC) { |
| 2697 | if (evutil_fast_socket_closeonexec(r) < 0) { |
| 2698 | evutil_closesocket(r); |
| 2699 | return -1; |
| 2700 | } |
| 2701 | } |
| 2702 | if (flags & EVUTIL_EFD_NONBLOCK) { |
| 2703 | if (evutil_fast_socket_nonblocking(r) < 0) { |
| 2704 | evutil_closesocket(r); |
| 2705 | return -1; |
| 2706 | } |
| 2707 | } |
| 2708 | return r; |
| 2709 | #else |
| 2710 | return -1; |
| 2711 | #endif |
| 2712 | } |
| 2713 | |
| 2714 | void |
| 2715 | evutil_free_globals_(void) |
| 2716 | { |
| 2717 | evutil_free_secure_rng_globals_(); |
| 2718 | evutil_free_sock_err_globals(); |
| 2719 | } |