The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU low level functions |
| 3 | * |
| 4 | * Copyright (c) 2003 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | #include <stdlib.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdarg.h> |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 27 | #include <stdbool.h> |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 28 | #include <string.h> |
| 29 | #include <errno.h> |
| 30 | #include <unistd.h> |
| 31 | #include <fcntl.h> |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 32 | |
David 'Digit' Turner | 73ad19a | 2014-03-17 11:52:51 +0100 | [diff] [blame] | 33 | #ifndef _WIN32 |
| 34 | #include <sys/socket.h> |
| 35 | #endif |
| 36 | |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 37 | /* Needed early for CONFIG_BSD etc. */ |
| 38 | #include "config-host.h" |
| 39 | |
David 'Digit' Turner | 280afa0 | 2011-05-11 17:37:44 +0200 | [diff] [blame] | 40 | #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) |
| 41 | #include <sys/mman.h> |
| 42 | #endif |
| 43 | |
David 'Digit' Turner | 2c538c8 | 2010-05-10 16:48:20 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_SOLARIS |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 45 | #include <sys/types.h> |
| 46 | #include <sys/statvfs.h> |
David 'Digit' Turner | 280afa0 | 2011-05-11 17:37:44 +0200 | [diff] [blame] | 47 | /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for |
| 48 | discussion about Solaris header problems */ |
| 49 | extern int madvise(caddr_t, size_t, int); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 50 | #endif |
| 51 | |
| 52 | #include "qemu-common.h" |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 53 | #include "trace.h" |
David 'Digit' Turner | d0edecb | 2013-12-17 09:32:26 +0100 | [diff] [blame] | 54 | #include "qemu/sockets.h" |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 55 | #include "monitor/monitor.h" |
| 56 | |
| 57 | static bool fips_enabled = false; |
| 58 | |
| 59 | static const char *qemu_version = QEMU_VERSION; |
| 60 | |
| 61 | #ifndef CONFIG_ANDROID // See android/sockets.c instead. |
| 62 | int socket_set_cork(int fd, int v) |
| 63 | { |
| 64 | #if defined(SOL_TCP) && defined(TCP_CORK) |
| 65 | return qemu_setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); |
| 66 | #else |
| 67 | return 0; |
| 68 | #endif |
| 69 | } |
| 70 | |
| 71 | int socket_set_nodelay(int fd) |
| 72 | { |
| 73 | int v = 1; |
| 74 | return qemu_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v)); |
| 75 | } |
| 76 | #endif // !CONFIG_ANDROID |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 77 | |
David 'Digit' Turner | 280afa0 | 2011-05-11 17:37:44 +0200 | [diff] [blame] | 78 | int qemu_madvise(void *addr, size_t len, int advice) |
| 79 | { |
| 80 | if (advice == QEMU_MADV_INVALID) { |
| 81 | errno = EINVAL; |
| 82 | return -1; |
| 83 | } |
| 84 | #if defined(CONFIG_MADVISE) |
| 85 | return madvise(addr, len, advice); |
| 86 | #elif defined(CONFIG_POSIX_MADVISE) |
| 87 | return posix_madvise(addr, len, advice); |
| 88 | #else |
| 89 | errno = EINVAL; |
| 90 | return -1; |
| 91 | #endif |
| 92 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 93 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 94 | #ifndef CONFIG_ANDROID |
| 95 | #ifndef _WIN32 |
| 96 | /* |
| 97 | * Dups an fd and sets the flags |
| 98 | */ |
| 99 | static int qemu_dup_flags(int fd, int flags) |
| 100 | { |
| 101 | int ret; |
| 102 | int serrno; |
| 103 | int dup_flags; |
| 104 | |
| 105 | #ifdef F_DUPFD_CLOEXEC |
| 106 | ret = fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| 107 | #else |
| 108 | ret = dup(fd); |
| 109 | if (ret != -1) { |
| 110 | qemu_set_cloexec(ret); |
| 111 | } |
| 112 | #endif |
| 113 | if (ret == -1) { |
| 114 | goto fail; |
| 115 | } |
| 116 | |
| 117 | dup_flags = fcntl(ret, F_GETFL); |
| 118 | if (dup_flags == -1) { |
| 119 | goto fail; |
| 120 | } |
| 121 | |
| 122 | if ((flags & O_SYNC) != (dup_flags & O_SYNC)) { |
| 123 | errno = EINVAL; |
| 124 | goto fail; |
| 125 | } |
| 126 | |
| 127 | /* Set/unset flags that we can with fcntl */ |
| 128 | if (fcntl(ret, F_SETFL, flags) == -1) { |
| 129 | goto fail; |
| 130 | } |
| 131 | |
| 132 | /* Truncate the file in the cases that open() would truncate it */ |
| 133 | if (flags & O_TRUNC || |
| 134 | ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) { |
| 135 | if (ftruncate(ret, 0) == -1) { |
| 136 | goto fail; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | return ret; |
| 141 | |
| 142 | fail: |
| 143 | serrno = errno; |
| 144 | if (ret != -1) { |
| 145 | close(ret); |
| 146 | } |
| 147 | errno = serrno; |
| 148 | return -1; |
| 149 | } |
| 150 | |
| 151 | static int qemu_parse_fdset(const char *param) |
| 152 | { |
| 153 | return qemu_parse_fd(param); |
| 154 | } |
| 155 | #endif |
| 156 | #endif // !CONFIG_ANDROID |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 157 | |
| 158 | /* |
| 159 | * Opens a file with FD_CLOEXEC set |
| 160 | */ |
| 161 | int qemu_open(const char *name, int flags, ...) |
| 162 | { |
| 163 | int ret; |
| 164 | int mode = 0; |
| 165 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 166 | #ifndef CONFIG_ANDROID |
| 167 | #ifndef _WIN32 |
| 168 | const char *fdset_id_str; |
| 169 | |
| 170 | /* Attempt dup of fd from fd set */ |
| 171 | if (strstart(name, "/dev/fdset/", &fdset_id_str)) { |
| 172 | int64_t fdset_id; |
| 173 | int fd, dupfd; |
| 174 | |
| 175 | fdset_id = qemu_parse_fdset(fdset_id_str); |
| 176 | if (fdset_id == -1) { |
| 177 | errno = EINVAL; |
| 178 | return -1; |
| 179 | } |
| 180 | |
| 181 | fd = monitor_fdset_get_fd(fdset_id, flags); |
| 182 | if (fd == -1) { |
| 183 | return -1; |
| 184 | } |
| 185 | |
| 186 | dupfd = qemu_dup_flags(fd, flags); |
| 187 | if (dupfd == -1) { |
| 188 | return -1; |
| 189 | } |
| 190 | |
| 191 | ret = monitor_fdset_dup_fd_add(fdset_id, dupfd); |
| 192 | if (ret == -1) { |
| 193 | close(dupfd); |
| 194 | errno = EINVAL; |
| 195 | return -1; |
| 196 | } |
| 197 | return dupfd; |
| 198 | } |
| 199 | #endif |
| 200 | #endif // !CONFIG_ANDROID |
| 201 | |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 202 | if (flags & O_CREAT) { |
| 203 | va_list ap; |
| 204 | |
| 205 | va_start(ap, flags); |
| 206 | mode = va_arg(ap, int); |
| 207 | va_end(ap); |
| 208 | } |
| 209 | |
| 210 | #ifdef O_CLOEXEC |
| 211 | ret = open(name, flags | O_CLOEXEC, mode); |
| 212 | #else |
| 213 | ret = open(name, flags, mode); |
| 214 | if (ret >= 0) { |
| 215 | qemu_set_cloexec(ret); |
| 216 | } |
| 217 | #endif |
| 218 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 219 | #ifdef O_DIRECT |
| 220 | if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) { |
| 221 | error_report("file system may not support O_DIRECT"); |
| 222 | errno = EINVAL; /* in case it was clobbered */ |
| 223 | } |
| 224 | #endif /* O_DIRECT */ |
| 225 | |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 226 | return ret; |
| 227 | } |
| 228 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 229 | int qemu_close(int fd) |
| 230 | { |
| 231 | #ifndef CONFIG_ANDROID |
| 232 | int64_t fdset_id; |
| 233 | |
| 234 | /* Close fd that was dup'd from an fdset */ |
| 235 | fdset_id = monitor_fdset_dup_fd_find(fd); |
| 236 | if (fdset_id != -1) { |
| 237 | int ret; |
| 238 | |
| 239 | ret = close(fd); |
| 240 | if (ret == 0) { |
| 241 | monitor_fdset_dup_fd_remove(fd); |
| 242 | } |
| 243 | |
| 244 | return ret; |
| 245 | } |
| 246 | #endif |
| 247 | return close(fd); |
| 248 | } |
| 249 | |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 250 | /* |
| 251 | * A variant of write(2) which handles partial write. |
| 252 | * |
| 253 | * Return the number of bytes transferred. |
| 254 | * Set errno if fewer than `count' bytes are written. |
| 255 | * |
| 256 | * This function don't work with non-blocking fd's. |
| 257 | * Any of the possibilities with non-bloking fd's is bad: |
| 258 | * - return a short write (then name is wrong) |
| 259 | * - busy wait adding (errno == EAGAIN) to the loop |
| 260 | */ |
| 261 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) |
| 262 | { |
| 263 | ssize_t ret = 0; |
| 264 | ssize_t total = 0; |
| 265 | |
| 266 | while (count) { |
| 267 | ret = write(fd, buf, count); |
| 268 | if (ret < 0) { |
| 269 | if (errno == EINTR) |
| 270 | continue; |
| 271 | break; |
| 272 | } |
| 273 | |
| 274 | count -= ret; |
| 275 | buf += ret; |
| 276 | total += ret; |
| 277 | } |
| 278 | |
| 279 | return total; |
| 280 | } |
| 281 | |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 282 | /* |
| 283 | * Opens a socket with FD_CLOEXEC set |
| 284 | */ |
| 285 | int qemu_socket(int domain, int type, int protocol) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | #ifdef SOCK_CLOEXEC |
| 290 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); |
| 291 | if (ret != -1 || errno != EINVAL) { |
| 292 | return ret; |
| 293 | } |
| 294 | #endif |
| 295 | ret = socket(domain, type, protocol); |
| 296 | if (ret >= 0) { |
| 297 | qemu_set_cloexec(ret); |
| 298 | } |
| 299 | |
| 300 | return ret; |
| 301 | } |
| 302 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 303 | #ifndef CONFIG_ANDROID |
David Turner | f7dd220 | 2010-09-10 10:59:22 +0200 | [diff] [blame] | 304 | /* |
| 305 | * Accept a connection and set FD_CLOEXEC |
| 306 | */ |
| 307 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) |
| 308 | { |
| 309 | int ret; |
| 310 | |
| 311 | #ifdef CONFIG_ACCEPT4 |
| 312 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); |
| 313 | if (ret != -1 || errno != ENOSYS) { |
| 314 | return ret; |
| 315 | } |
| 316 | #endif |
| 317 | ret = accept(s, addr, addrlen); |
| 318 | if (ret >= 0) { |
| 319 | qemu_set_cloexec(ret); |
| 320 | } |
| 321 | |
| 322 | return ret; |
| 323 | } |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 324 | #endif |
| 325 | |
| 326 | /* |
| 327 | * A variant of send(2) which handles partial write. |
| 328 | * |
| 329 | * Return the number of bytes transferred, which is only |
| 330 | * smaller than `count' if there is an error. |
| 331 | * |
| 332 | * This function won't work with non-blocking fd's. |
| 333 | * Any of the possibilities with non-bloking fd's is bad: |
| 334 | * - return a short write (then name is wrong) |
| 335 | * - busy wait adding (errno == EAGAIN) to the loop |
| 336 | */ |
| 337 | ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) |
| 338 | { |
| 339 | ssize_t ret = 0; |
| 340 | ssize_t total = 0; |
| 341 | |
| 342 | while (count) { |
| 343 | ret = send(fd, buf, count, flags); |
| 344 | if (ret < 0) { |
| 345 | if (errno == EINTR) { |
| 346 | continue; |
| 347 | } |
| 348 | break; |
| 349 | } |
| 350 | |
| 351 | count -= ret; |
| 352 | buf += ret; |
| 353 | total += ret; |
| 354 | } |
| 355 | |
| 356 | return total; |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * A variant of recv(2) which handles partial write. |
| 361 | * |
| 362 | * Return the number of bytes transferred, which is only |
| 363 | * smaller than `count' if there is an error. |
| 364 | * |
| 365 | * This function won't work with non-blocking fd's. |
| 366 | * Any of the possibilities with non-bloking fd's is bad: |
| 367 | * - return a short write (then name is wrong) |
| 368 | * - busy wait adding (errno == EAGAIN) to the loop |
| 369 | */ |
| 370 | ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) |
| 371 | { |
| 372 | ssize_t ret = 0; |
| 373 | ssize_t total = 0; |
| 374 | |
| 375 | while (count) { |
| 376 | ret = qemu_recv(fd, buf, count, flags); |
| 377 | if (ret <= 0) { |
| 378 | if (ret < 0 && errno == EINTR) { |
| 379 | continue; |
| 380 | } |
| 381 | break; |
| 382 | } |
| 383 | |
| 384 | count -= ret; |
| 385 | buf += ret; |
| 386 | total += ret; |
| 387 | } |
| 388 | |
| 389 | return total; |
| 390 | } |
| 391 | |
| 392 | void qemu_set_version(const char *version) |
| 393 | { |
| 394 | qemu_version = version; |
| 395 | } |
| 396 | |
| 397 | const char *qemu_get_version(void) |
| 398 | { |
| 399 | return qemu_version; |
| 400 | } |
| 401 | |
| 402 | void fips_set_state(bool requested) |
| 403 | { |
| 404 | #ifdef __linux__ |
| 405 | if (requested) { |
| 406 | FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r"); |
| 407 | if (fds != NULL) { |
| 408 | fips_enabled = (fgetc(fds) == '1'); |
| 409 | fclose(fds); |
| 410 | } |
| 411 | } |
| 412 | #else |
| 413 | fips_enabled = false; |
| 414 | #endif /* __linux__ */ |
| 415 | |
| 416 | #ifdef _FIPS_DEBUG |
| 417 | fprintf(stderr, "FIPS mode %s (requested %s)\n", |
| 418 | (fips_enabled ? "enabled" : "disabled"), |
| 419 | (requested ? "enabled" : "disabled")); |
| 420 | #endif |
| 421 | } |
| 422 | |
| 423 | bool fips_get_state(void) |
| 424 | { |
| 425 | return fips_enabled; |
| 426 | } |
| 427 | |
| 428 | #ifndef CONFIG_ANDROID |
| 429 | #ifdef _WIN32 |
| 430 | static void socket_cleanup(void) |
| 431 | { |
| 432 | WSACleanup(); |
| 433 | } |
| 434 | #endif |
| 435 | |
| 436 | int socket_init(void) |
| 437 | { |
| 438 | #ifdef _WIN32 |
| 439 | WSADATA Data; |
| 440 | int ret, err; |
| 441 | |
| 442 | ret = WSAStartup(MAKEWORD(2, 2), &Data); |
| 443 | if (ret != 0) { |
| 444 | err = WSAGetLastError(); |
| 445 | fprintf(stderr, "WSAStartup: %d\n", err); |
| 446 | return -1; |
| 447 | } |
| 448 | atexit(socket_cleanup); |
| 449 | #endif |
| 450 | return 0; |
| 451 | } |
| 452 | #endif // !CONFIG_ANDROID |
| 453 | |
| 454 | #ifndef CONFIG_IOVEC |
| 455 | /* helper function for iov_send_recv() */ |
| 456 | static ssize_t |
| 457 | readv_writev(int fd, const struct iovec *iov, int iov_cnt, bool do_write) |
| 458 | { |
| 459 | unsigned i = 0; |
| 460 | ssize_t ret = 0; |
| 461 | while (i < iov_cnt) { |
| 462 | ssize_t r = do_write |
| 463 | ? write(fd, iov[i].iov_base, iov[i].iov_len) |
| 464 | : read(fd, iov[i].iov_base, iov[i].iov_len); |
| 465 | if (r > 0) { |
| 466 | ret += r; |
| 467 | } else if (!r) { |
| 468 | break; |
| 469 | } else if (errno == EINTR) { |
| 470 | continue; |
| 471 | } else { |
| 472 | /* else it is some "other" error, |
| 473 | * only return if there was no data processed. */ |
| 474 | if (ret == 0) { |
| 475 | ret = -1; |
| 476 | } |
| 477 | break; |
| 478 | } |
| 479 | i++; |
| 480 | } |
| 481 | return ret; |
| 482 | } |
| 483 | |
| 484 | ssize_t |
| 485 | readv(int fd, const struct iovec *iov, int iov_cnt) |
| 486 | { |
| 487 | return readv_writev(fd, iov, iov_cnt, false); |
| 488 | } |
| 489 | |
| 490 | ssize_t |
| 491 | writev(int fd, const struct iovec *iov, int iov_cnt) |
| 492 | { |
| 493 | return readv_writev(fd, iov, iov_cnt, true); |
| 494 | } |
| 495 | #endif |
David Turner | b919805 | 2010-09-10 11:50:34 +0200 | [diff] [blame] | 496 | |
David 'Digit' Turner | 7891dd3 | 2014-04-28 10:59:47 +0200 | [diff] [blame] | 497 | #if defined(_WIN32) && !QEMU_GNUC_PREREQ(4,4) |
| 498 | // Older Mingw32 didn't provide these. |
Andrew Hsieh | 7f661af | 2012-05-02 13:24:28 +0800 | [diff] [blame] | 499 | int asprintf( char **, const char *, ... ); |
| 500 | int vasprintf( char **, const char *, va_list ); |
David Turner | b919805 | 2010-09-10 11:50:34 +0200 | [diff] [blame] | 501 | |
Andrew Hsieh | 7f661af | 2012-05-02 13:24:28 +0800 | [diff] [blame] | 502 | int vasprintf( char **sptr, const char *fmt, va_list argv ) |
David Turner | b919805 | 2010-09-10 11:50:34 +0200 | [diff] [blame] | 503 | { |
| 504 | int wanted = vsnprintf( *sptr = NULL, 0, fmt, argv ); |
| 505 | if( (wanted > 0) && ((*sptr = malloc( 1 + wanted )) != NULL) ) |
| 506 | return vsprintf( *sptr, fmt, argv ); |
| 507 | |
| 508 | return wanted; |
| 509 | } |
| 510 | |
Andrew Hsieh | 7f661af | 2012-05-02 13:24:28 +0800 | [diff] [blame] | 511 | int asprintf( char **sptr, const char *fmt, ... ) |
David Turner | b919805 | 2010-09-10 11:50:34 +0200 | [diff] [blame] | 512 | { |
| 513 | int retval; |
| 514 | va_list argv; |
| 515 | va_start( argv, fmt ); |
| 516 | retval = vasprintf( sptr, fmt, argv ); |
| 517 | va_end( argv ); |
| 518 | return retval; |
| 519 | } |
David 'Digit' Turner | 7891dd3 | 2014-04-28 10:59:47 +0200 | [diff] [blame] | 520 | #endif // _WIN32 && !QEMU_GNUC_PREREQ(4,4) |