bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU low level functions |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 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> |
Paul Moore | 0f66998 | 2012-08-03 14:39:21 -0400 | [diff] [blame] | 27 | #include <stdbool.h> |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 28 | #include <string.h> |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 29 | #include <errno.h> |
| 30 | #include <unistd.h> |
ths | aa26bb2 | 2007-03-25 21:33:06 +0000 | [diff] [blame] | 31 | #include <fcntl.h> |
Paolo Bonzini | f582af5 | 2010-02-02 20:33:11 +0100 | [diff] [blame] | 32 | |
| 33 | /* Needed early for CONFIG_BSD etc. */ |
| 34 | #include "config-host.h" |
| 35 | |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 36 | #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) |
| 37 | #include <sys/mman.h> |
| 38 | #endif |
| 39 | |
Juan Quintela | dfe5fff | 2009-07-27 16:12:40 +0200 | [diff] [blame] | 40 | #ifdef CONFIG_SOLARIS |
ths | 605686c | 2007-01-17 23:31:19 +0000 | [diff] [blame] | 41 | #include <sys/types.h> |
| 42 | #include <sys/statvfs.h> |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 43 | /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for |
| 44 | discussion about Solaris header problems */ |
| 45 | extern int madvise(caddr_t, size_t, int); |
ths | 605686c | 2007-01-17 23:31:19 +0000 | [diff] [blame] | 46 | #endif |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 47 | |
blueswir1 | 511d2b1 | 2009-03-07 15:32:56 +0000 | [diff] [blame] | 48 | #include "qemu-common.h" |
Stefan Hajnoczi | cd245a1 | 2010-05-22 18:09:25 +0100 | [diff] [blame] | 49 | #include "trace.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 50 | #include "qemu/sockets.h" |
Paolo Bonzini | 83c9089 | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 51 | #include "monitor/monitor.h" |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 52 | |
Paul Moore | 0f66998 | 2012-08-03 14:39:21 -0400 | [diff] [blame] | 53 | static bool fips_enabled = false; |
| 54 | |
Crístian Viana | 93bfef4 | 2012-05-30 00:35:51 -0300 | [diff] [blame] | 55 | static const char *qemu_version = QEMU_VERSION; |
| 56 | |
Paolo Bonzini | 128aa58 | 2011-09-21 12:36:48 +0200 | [diff] [blame] | 57 | int socket_set_cork(int fd, int v) |
| 58 | { |
| 59 | #if defined(SOL_TCP) && defined(TCP_CORK) |
| 60 | return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); |
| 61 | #else |
| 62 | return 0; |
| 63 | #endif |
| 64 | } |
| 65 | |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 66 | int qemu_madvise(void *addr, size_t len, int advice) |
| 67 | { |
| 68 | if (advice == QEMU_MADV_INVALID) { |
| 69 | errno = EINVAL; |
| 70 | return -1; |
| 71 | } |
| 72 | #if defined(CONFIG_MADVISE) |
| 73 | return madvise(addr, len, advice); |
| 74 | #elif defined(CONFIG_POSIX_MADVISE) |
| 75 | return posix_madvise(addr, len, advice); |
| 76 | #else |
| 77 | errno = EINVAL; |
| 78 | return -1; |
| 79 | #endif |
| 80 | } |
| 81 | |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 82 | #ifndef _WIN32 |
| 83 | /* |
| 84 | * Dups an fd and sets the flags |
| 85 | */ |
| 86 | static int qemu_dup_flags(int fd, int flags) |
| 87 | { |
| 88 | int ret; |
| 89 | int serrno; |
| 90 | int dup_flags; |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 91 | |
| 92 | #ifdef F_DUPFD_CLOEXEC |
| 93 | ret = fcntl(fd, F_DUPFD_CLOEXEC, 0); |
| 94 | #else |
| 95 | ret = dup(fd); |
| 96 | if (ret != -1) { |
| 97 | qemu_set_cloexec(ret); |
| 98 | } |
| 99 | #endif |
| 100 | if (ret == -1) { |
| 101 | goto fail; |
| 102 | } |
| 103 | |
| 104 | dup_flags = fcntl(ret, F_GETFL); |
| 105 | if (dup_flags == -1) { |
| 106 | goto fail; |
| 107 | } |
| 108 | |
| 109 | if ((flags & O_SYNC) != (dup_flags & O_SYNC)) { |
| 110 | errno = EINVAL; |
| 111 | goto fail; |
| 112 | } |
| 113 | |
| 114 | /* Set/unset flags that we can with fcntl */ |
Corey Bryant | 3b6eda2 | 2012-10-18 16:41:04 -0400 | [diff] [blame] | 115 | if (fcntl(ret, F_SETFL, flags) == -1) { |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 116 | goto fail; |
| 117 | } |
| 118 | |
| 119 | /* Truncate the file in the cases that open() would truncate it */ |
| 120 | if (flags & O_TRUNC || |
| 121 | ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) { |
| 122 | if (ftruncate(ret, 0) == -1) { |
| 123 | goto fail; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | return ret; |
| 128 | |
| 129 | fail: |
| 130 | serrno = errno; |
| 131 | if (ret != -1) { |
| 132 | close(ret); |
| 133 | } |
| 134 | errno = serrno; |
| 135 | return -1; |
| 136 | } |
Paolo Bonzini | 0100fbb | 2012-10-29 15:19:18 +0100 | [diff] [blame] | 137 | |
| 138 | static int qemu_parse_fdset(const char *param) |
| 139 | { |
| 140 | return qemu_parse_fd(param); |
| 141 | } |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 142 | #endif |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 143 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 144 | /* |
| 145 | * Opens a file with FD_CLOEXEC set |
| 146 | */ |
| 147 | int qemu_open(const char *name, int flags, ...) |
| 148 | { |
| 149 | int ret; |
| 150 | int mode = 0; |
| 151 | |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 152 | #ifndef _WIN32 |
| 153 | const char *fdset_id_str; |
| 154 | |
| 155 | /* Attempt dup of fd from fd set */ |
| 156 | if (strstart(name, "/dev/fdset/", &fdset_id_str)) { |
| 157 | int64_t fdset_id; |
| 158 | int fd, dupfd; |
| 159 | |
| 160 | fdset_id = qemu_parse_fdset(fdset_id_str); |
| 161 | if (fdset_id == -1) { |
| 162 | errno = EINVAL; |
| 163 | return -1; |
| 164 | } |
| 165 | |
| 166 | fd = monitor_fdset_get_fd(fdset_id, flags); |
| 167 | if (fd == -1) { |
| 168 | return -1; |
| 169 | } |
| 170 | |
| 171 | dupfd = qemu_dup_flags(fd, flags); |
| 172 | if (dupfd == -1) { |
| 173 | return -1; |
| 174 | } |
| 175 | |
| 176 | ret = monitor_fdset_dup_fd_add(fdset_id, dupfd); |
| 177 | if (ret == -1) { |
| 178 | close(dupfd); |
| 179 | errno = EINVAL; |
| 180 | return -1; |
| 181 | } |
| 182 | |
| 183 | return dupfd; |
| 184 | } |
| 185 | #endif |
| 186 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 187 | if (flags & O_CREAT) { |
| 188 | va_list ap; |
| 189 | |
| 190 | va_start(ap, flags); |
| 191 | mode = va_arg(ap, int); |
| 192 | va_end(ap); |
| 193 | } |
| 194 | |
| 195 | #ifdef O_CLOEXEC |
| 196 | ret = open(name, flags | O_CLOEXEC, mode); |
| 197 | #else |
| 198 | ret = open(name, flags, mode); |
| 199 | if (ret >= 0) { |
| 200 | qemu_set_cloexec(ret); |
| 201 | } |
| 202 | #endif |
| 203 | |
| 204 | return ret; |
| 205 | } |
| 206 | |
Corey Bryant | 2e1e79d | 2012-08-14 16:43:46 -0400 | [diff] [blame] | 207 | int qemu_close(int fd) |
| 208 | { |
Corey Bryant | adb696f | 2012-08-14 16:43:47 -0400 | [diff] [blame] | 209 | int64_t fdset_id; |
| 210 | |
| 211 | /* Close fd that was dup'd from an fdset */ |
| 212 | fdset_id = monitor_fdset_dup_fd_find(fd); |
| 213 | if (fdset_id != -1) { |
| 214 | int ret; |
| 215 | |
| 216 | ret = close(fd); |
| 217 | if (ret == 0) { |
| 218 | monitor_fdset_dup_fd_remove(fd); |
| 219 | } |
| 220 | |
| 221 | return ret; |
| 222 | } |
| 223 | |
Corey Bryant | 2e1e79d | 2012-08-14 16:43:46 -0400 | [diff] [blame] | 224 | return close(fd); |
| 225 | } |
| 226 | |
Kirill A. Shutemov | 7b5f699 | 2010-01-20 00:56:08 +0100 | [diff] [blame] | 227 | /* |
| 228 | * A variant of write(2) which handles partial write. |
| 229 | * |
| 230 | * Return the number of bytes transferred. |
| 231 | * Set errno if fewer than `count' bytes are written. |
Juan Quintela | 1298cb6 | 2010-03-04 10:00:39 +0100 | [diff] [blame] | 232 | * |
| 233 | * This function don't work with non-blocking fd's. |
| 234 | * Any of the possibilities with non-bloking fd's is bad: |
| 235 | * - return a short write (then name is wrong) |
| 236 | * - busy wait adding (errno == EAGAIN) to the loop |
Kirill A. Shutemov | 7b5f699 | 2010-01-20 00:56:08 +0100 | [diff] [blame] | 237 | */ |
| 238 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) |
| 239 | { |
| 240 | ssize_t ret = 0; |
| 241 | ssize_t total = 0; |
| 242 | |
| 243 | while (count) { |
| 244 | ret = write(fd, buf, count); |
| 245 | if (ret < 0) { |
| 246 | if (errno == EINTR) |
| 247 | continue; |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | count -= ret; |
| 252 | buf += ret; |
| 253 | total += ret; |
| 254 | } |
| 255 | |
| 256 | return total; |
| 257 | } |
| 258 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 259 | /* |
| 260 | * Opens a socket with FD_CLOEXEC set |
| 261 | */ |
| 262 | int qemu_socket(int domain, int type, int protocol) |
| 263 | { |
| 264 | int ret; |
| 265 | |
| 266 | #ifdef SOCK_CLOEXEC |
| 267 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); |
Andre Przywara | 3a03bfa | 2009-12-18 10:45:07 +0100 | [diff] [blame] | 268 | if (ret != -1 || errno != EINVAL) { |
| 269 | return ret; |
| 270 | } |
| 271 | #endif |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 272 | ret = socket(domain, type, protocol); |
| 273 | if (ret >= 0) { |
| 274 | qemu_set_cloexec(ret); |
| 275 | } |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 276 | |
| 277 | return ret; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Accept a connection and set FD_CLOEXEC |
| 282 | */ |
| 283 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) |
| 284 | { |
| 285 | int ret; |
| 286 | |
| 287 | #ifdef CONFIG_ACCEPT4 |
| 288 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); |
Kevin Wolf | 347ed55 | 2010-01-13 16:20:56 +0100 | [diff] [blame] | 289 | if (ret != -1 || errno != ENOSYS) { |
Andre Przywara | 3a03bfa | 2009-12-18 10:45:07 +0100 | [diff] [blame] | 290 | return ret; |
| 291 | } |
| 292 | #endif |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 293 | ret = accept(s, addr, addrlen); |
| 294 | if (ret >= 0) { |
| 295 | qemu_set_cloexec(ret); |
| 296 | } |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 297 | |
| 298 | return ret; |
| 299 | } |
Paolo Bonzini | 993295f | 2011-09-17 16:27:59 +0200 | [diff] [blame] | 300 | |
| 301 | /* |
| 302 | * A variant of send(2) which handles partial write. |
| 303 | * |
| 304 | * Return the number of bytes transferred, which is only |
| 305 | * smaller than `count' if there is an error. |
| 306 | * |
| 307 | * This function won't work with non-blocking fd's. |
| 308 | * Any of the possibilities with non-bloking fd's is bad: |
| 309 | * - return a short write (then name is wrong) |
| 310 | * - busy wait adding (errno == EAGAIN) to the loop |
| 311 | */ |
| 312 | ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) |
| 313 | { |
| 314 | ssize_t ret = 0; |
| 315 | ssize_t total = 0; |
| 316 | |
| 317 | while (count) { |
| 318 | ret = send(fd, buf, count, flags); |
| 319 | if (ret < 0) { |
| 320 | if (errno == EINTR) { |
| 321 | continue; |
| 322 | } |
| 323 | break; |
| 324 | } |
| 325 | |
| 326 | count -= ret; |
| 327 | buf += ret; |
| 328 | total += ret; |
| 329 | } |
| 330 | |
| 331 | return total; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * A variant of recv(2) which handles partial write. |
| 336 | * |
| 337 | * Return the number of bytes transferred, which is only |
| 338 | * smaller than `count' if there is an error. |
| 339 | * |
| 340 | * This function won't work with non-blocking fd's. |
| 341 | * Any of the possibilities with non-bloking fd's is bad: |
| 342 | * - return a short write (then name is wrong) |
| 343 | * - busy wait adding (errno == EAGAIN) to the loop |
| 344 | */ |
| 345 | ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) |
| 346 | { |
| 347 | ssize_t ret = 0; |
| 348 | ssize_t total = 0; |
| 349 | |
| 350 | while (count) { |
| 351 | ret = qemu_recv(fd, buf, count, flags); |
| 352 | if (ret <= 0) { |
| 353 | if (ret < 0 && errno == EINTR) { |
| 354 | continue; |
| 355 | } |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | count -= ret; |
| 360 | buf += ret; |
| 361 | total += ret; |
| 362 | } |
| 363 | |
| 364 | return total; |
| 365 | } |
| 366 | |
Crístian Viana | 93bfef4 | 2012-05-30 00:35:51 -0300 | [diff] [blame] | 367 | void qemu_set_version(const char *version) |
| 368 | { |
| 369 | qemu_version = version; |
| 370 | } |
| 371 | |
| 372 | const char *qemu_get_version(void) |
| 373 | { |
| 374 | return qemu_version; |
| 375 | } |
Paul Moore | 0f66998 | 2012-08-03 14:39:21 -0400 | [diff] [blame] | 376 | |
| 377 | void fips_set_state(bool requested) |
| 378 | { |
| 379 | #ifdef __linux__ |
| 380 | if (requested) { |
| 381 | FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r"); |
| 382 | if (fds != NULL) { |
| 383 | fips_enabled = (fgetc(fds) == '1'); |
| 384 | fclose(fds); |
| 385 | } |
| 386 | } |
| 387 | #else |
| 388 | fips_enabled = false; |
| 389 | #endif /* __linux__ */ |
| 390 | |
| 391 | #ifdef _FIPS_DEBUG |
| 392 | fprintf(stderr, "FIPS mode %s (requested %s)\n", |
| 393 | (fips_enabled ? "enabled" : "disabled"), |
| 394 | (requested ? "enabled" : "disabled")); |
| 395 | #endif |
| 396 | } |
| 397 | |
| 398 | bool fips_get_state(void) |
| 399 | { |
| 400 | return fips_enabled; |
| 401 | } |
Paolo Bonzini | 0100fbb | 2012-10-29 15:19:18 +0100 | [diff] [blame] | 402 | |