Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | * THE SOFTWARE. |
| 24 | */ |
| 25 | |
| 26 | #include <unistd.h> |
| 27 | #include <fcntl.h> |
| 28 | #include <signal.h> |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 29 | #include <sys/types.h> |
| 30 | #include <sys/wait.h> |
Jes Sorensen | 69e8b16 | 2010-07-06 10:50:27 +0200 | [diff] [blame] | 31 | /*needed for MAP_POPULATE before including qemu-options.h */ |
| 32 | #include <sys/mman.h> |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 33 | #include <pwd.h> |
Stefan Hajnoczi | cc4662f | 2011-07-09 10:22:07 +0100 | [diff] [blame] | 34 | #include <grp.h> |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 35 | #include <libgen.h> |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 36 | |
| 37 | /* Needed early for CONFIG_BSD etc. */ |
| 38 | #include "config-host.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 39 | #include "sysemu/sysemu.h" |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 40 | #include "net/slirp.h" |
| 41 | #include "qemu-options.h" |
Paolo Bonzini | a59629f | 2015-03-31 13:01:05 +0200 | [diff] [blame] | 42 | #include "qemu/rcu.h" |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 43 | |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 44 | #ifdef CONFIG_LINUX |
| 45 | #include <sys/prctl.h> |
Jes Sorensen | 949d31e | 2010-10-26 10:39:22 +0200 | [diff] [blame] | 46 | #endif |
| 47 | |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 48 | static struct passwd *user_pwd; |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 49 | static const char *chroot_dir; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 50 | static int daemonize; |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 51 | static int daemon_pipe; |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 52 | |
Jes Sorensen | fe98ac1 | 2010-06-10 11:42:21 +0200 | [diff] [blame] | 53 | void os_setup_early_signal_handling(void) |
Jes Sorensen | 86b645e | 2010-06-10 11:42:19 +0200 | [diff] [blame] | 54 | { |
| 55 | struct sigaction act; |
| 56 | sigfillset(&act.sa_mask); |
| 57 | act.sa_flags = 0; |
| 58 | act.sa_handler = SIG_IGN; |
| 59 | sigaction(SIGPIPE, &act, NULL); |
| 60 | } |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 61 | |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 62 | static void termsig_handler(int signal, siginfo_t *info, void *c) |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 63 | { |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 64 | qemu_system_killed(info->si_signo, info->si_pid); |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 65 | } |
| 66 | |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 67 | void os_setup_signal_handling(void) |
| 68 | { |
| 69 | struct sigaction act; |
| 70 | |
| 71 | memset(&act, 0, sizeof(act)); |
Gleb Natapov | f64622c | 2011-03-15 13:56:04 +0200 | [diff] [blame] | 72 | act.sa_sigaction = termsig_handler; |
| 73 | act.sa_flags = SA_SIGINFO; |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 74 | sigaction(SIGINT, &act, NULL); |
| 75 | sigaction(SIGHUP, &act, NULL); |
| 76 | sigaction(SIGTERM, &act, NULL); |
Jes Sorensen | 8d963e6 | 2010-06-10 11:42:22 +0200 | [diff] [blame] | 77 | } |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 78 | |
| 79 | /* Find a likely location for support files using the location of the binary. |
| 80 | For installed binaries this will be "$bindir/../share/qemu". When |
| 81 | running from the build tree this will be "$bindir/../pc-bios". */ |
| 82 | #define SHARE_SUFFIX "/share/qemu" |
| 83 | #define BUILD_SUFFIX "/pc-bios" |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 84 | char *os_find_datadir(void) |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 85 | { |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 86 | char *dir, *exec_dir; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 87 | char *res; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 88 | size_t max_len; |
| 89 | |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 90 | exec_dir = qemu_get_exec_dir(); |
| 91 | if (exec_dir == NULL) { |
| 92 | return NULL; |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 93 | } |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 94 | dir = dirname(exec_dir); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 95 | |
| 96 | max_len = strlen(dir) + |
| 97 | MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 98 | res = g_malloc0(max_len); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 99 | snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX); |
| 100 | if (access(res, R_OK)) { |
| 101 | snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX); |
| 102 | if (access(res, R_OK)) { |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 103 | g_free(res); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 104 | res = NULL; |
| 105 | } |
| 106 | } |
| 107 | |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 108 | g_free(exec_dir); |
Jes Sorensen | 6170540 | 2010-06-10 11:42:23 +0200 | [diff] [blame] | 109 | return res; |
| 110 | } |
| 111 | #undef SHARE_SUFFIX |
| 112 | #undef BUILD_SUFFIX |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 113 | |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 114 | void os_set_proc_name(const char *s) |
| 115 | { |
| 116 | #if defined(PR_SET_NAME) |
| 117 | char name[16]; |
| 118 | if (!s) |
| 119 | return; |
Jim Meyering | 3eadc68 | 2012-10-04 13:09:51 +0200 | [diff] [blame] | 120 | pstrcpy(name, sizeof(name), s); |
Jes Sorensen | ce798cf | 2010-06-10 11:42:31 +0200 | [diff] [blame] | 121 | /* Could rewrite argv[0] too, but that's a bit more complicated. |
| 122 | This simple way is enough for `top'. */ |
| 123 | if (prctl(PR_SET_NAME, name)) { |
| 124 | perror("unable to change process name"); |
| 125 | exit(1); |
| 126 | } |
| 127 | #else |
| 128 | fprintf(stderr, "Change of process name not supported by your OS\n"); |
| 129 | exit(1); |
| 130 | #endif |
| 131 | } |
| 132 | |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 133 | /* |
| 134 | * Parse OS specific command line options. |
| 135 | * return 0 if option handled, -1 otherwise |
| 136 | */ |
| 137 | void os_parse_cmd_args(int index, const char *optarg) |
| 138 | { |
| 139 | switch (index) { |
| 140 | #ifdef CONFIG_SLIRP |
| 141 | case QEMU_OPTION_smb: |
| 142 | if (net_slirp_smb(optarg) < 0) |
| 143 | exit(1); |
| 144 | break; |
| 145 | #endif |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 146 | case QEMU_OPTION_runas: |
| 147 | user_pwd = getpwnam(optarg); |
| 148 | if (!user_pwd) { |
| 149 | fprintf(stderr, "User \"%s\" doesn't exist\n", optarg); |
| 150 | exit(1); |
| 151 | } |
| 152 | break; |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 153 | case QEMU_OPTION_chroot: |
| 154 | chroot_dir = optarg; |
| 155 | break; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 156 | case QEMU_OPTION_daemonize: |
| 157 | daemonize = 1; |
| 158 | break; |
Anthony Liguori | 70678b8 | 2012-08-03 18:28:37 -0500 | [diff] [blame] | 159 | #if defined(CONFIG_LINUX) |
| 160 | case QEMU_OPTION_enablefips: |
| 161 | fips_set_state(true); |
| 162 | break; |
| 163 | #endif |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 164 | } |
Jes Sorensen | 59a5264 | 2010-06-10 11:42:25 +0200 | [diff] [blame] | 165 | } |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 166 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 167 | static void change_process_uid(void) |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 168 | { |
| 169 | if (user_pwd) { |
| 170 | if (setgid(user_pwd->pw_gid) < 0) { |
| 171 | fprintf(stderr, "Failed to setgid(%d)\n", user_pwd->pw_gid); |
| 172 | exit(1); |
| 173 | } |
Stefan Hajnoczi | cc4662f | 2011-07-09 10:22:07 +0100 | [diff] [blame] | 174 | if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) { |
| 175 | fprintf(stderr, "Failed to initgroups(\"%s\", %d)\n", |
| 176 | user_pwd->pw_name, user_pwd->pw_gid); |
| 177 | exit(1); |
| 178 | } |
Jes Sorensen | 8847cfe | 2010-06-10 11:42:26 +0200 | [diff] [blame] | 179 | if (setuid(user_pwd->pw_uid) < 0) { |
| 180 | fprintf(stderr, "Failed to setuid(%d)\n", user_pwd->pw_uid); |
| 181 | exit(1); |
| 182 | } |
| 183 | if (setuid(0) != -1) { |
| 184 | fprintf(stderr, "Dropping privileges failed\n"); |
| 185 | exit(1); |
| 186 | } |
| 187 | } |
| 188 | } |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 189 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 190 | static void change_root(void) |
Jes Sorensen | 0766379 | 2010-06-10 11:42:27 +0200 | [diff] [blame] | 191 | { |
| 192 | if (chroot_dir) { |
| 193 | if (chroot(chroot_dir) < 0) { |
| 194 | fprintf(stderr, "chroot failed\n"); |
| 195 | exit(1); |
| 196 | } |
| 197 | if (chdir("/")) { |
| 198 | perror("not able to chdir to /"); |
| 199 | exit(1); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 204 | |
| 205 | void os_daemonize(void) |
| 206 | { |
| 207 | if (daemonize) { |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 208 | pid_t pid; |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 209 | int fds[2]; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 210 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 211 | if (pipe(fds) == -1) { |
| 212 | exit(1); |
| 213 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 214 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 215 | pid = fork(); |
| 216 | if (pid > 0) { |
| 217 | uint8_t status; |
| 218 | ssize_t len; |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 219 | |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 220 | close(fds[1]); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 221 | |
Michael Tokarev | ccea25f | 2014-10-30 17:37:16 +0300 | [diff] [blame] | 222 | do { |
| 223 | len = read(fds[0], &status, 1); |
| 224 | } while (len < 0 && errno == EINTR); |
Michael Tokarev | fee78fd | 2014-10-30 17:40:48 +0300 | [diff] [blame] | 225 | |
| 226 | /* only exit successfully if our child actually wrote |
| 227 | * a one-byte zero to our pipe, upon successful init */ |
| 228 | exit(len == 1 && status == 0 ? 0 : 1); |
| 229 | |
| 230 | } else if (pid < 0) { |
| 231 | exit(1); |
| 232 | } |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 233 | |
| 234 | close(fds[0]); |
Michael Tokarev | 0be5e43 | 2014-10-30 17:30:51 +0300 | [diff] [blame] | 235 | daemon_pipe = fds[1]; |
| 236 | qemu_set_cloexec(daemon_pipe); |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 237 | |
| 238 | setsid(); |
| 239 | |
| 240 | pid = fork(); |
| 241 | if (pid > 0) { |
| 242 | exit(0); |
| 243 | } else if (pid < 0) { |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 244 | exit(1); |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 245 | } |
| 246 | umask(027); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 247 | |
| 248 | signal(SIGTSTP, SIG_IGN); |
| 249 | signal(SIGTTOU, SIG_IGN); |
| 250 | signal(SIGTTIN, SIG_IGN); |
Paolo Bonzini | a59629f | 2015-03-31 13:01:05 +0200 | [diff] [blame] | 251 | rcu_after_fork(); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | |
| 255 | void os_setup_post(void) |
| 256 | { |
| 257 | int fd = 0; |
| 258 | |
| 259 | if (daemonize) { |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 260 | if (chdir("/")) { |
| 261 | perror("not able to chdir to /"); |
| 262 | exit(1); |
| 263 | } |
Gonglei | 63ce8e1 | 2014-09-26 16:14:30 +0800 | [diff] [blame] | 264 | TFR(fd = qemu_open("/dev/null", O_RDWR)); |
| 265 | if (fd == -1) { |
| 266 | exit(1); |
| 267 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 268 | } |
| 269 | |
Jes Sorensen | e06eb60 | 2010-06-10 11:42:29 +0200 | [diff] [blame] | 270 | change_root(); |
| 271 | change_process_uid(); |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 272 | |
| 273 | if (daemonize) { |
Michael Tokarev | 25cec2b | 2014-10-30 17:47:46 +0300 | [diff] [blame] | 274 | uint8_t status = 0; |
| 275 | ssize_t len; |
| 276 | |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 277 | dup2(fd, 0); |
| 278 | dup2(fd, 1); |
| 279 | dup2(fd, 2); |
| 280 | |
| 281 | close(fd); |
Michael Tokarev | 25cec2b | 2014-10-30 17:47:46 +0300 | [diff] [blame] | 282 | |
| 283 | do { |
| 284 | len = write(daemon_pipe, &status, 1); |
| 285 | } while (len < 0 && errno == EINTR); |
| 286 | if (len != 1) { |
| 287 | exit(1); |
| 288 | } |
Jes Sorensen | eb505be | 2010-06-10 11:42:28 +0200 | [diff] [blame] | 289 | } |
| 290 | } |
| 291 | |
Jes Sorensen | 9156d76 | 2010-06-10 11:42:30 +0200 | [diff] [blame] | 292 | void os_set_line_buffering(void) |
| 293 | { |
| 294 | setvbuf(stdout, NULL, _IOLBF, 0); |
| 295 | } |
Jes Sorensen | 949d31e | 2010-10-26 10:39:22 +0200 | [diff] [blame] | 296 | |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 297 | int qemu_create_pidfile(const char *filename) |
| 298 | { |
| 299 | char buffer[128]; |
| 300 | int len; |
| 301 | int fd; |
| 302 | |
| 303 | fd = qemu_open(filename, O_RDWR | O_CREAT, 0600); |
| 304 | if (fd == -1) { |
| 305 | return -1; |
| 306 | } |
| 307 | if (lockf(fd, F_TLOCK, 0) == -1) { |
Markus Armbruster | 1bbd159 | 2011-11-11 10:40:09 +0100 | [diff] [blame] | 308 | close(fd); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 309 | return -1; |
| 310 | } |
Andreas Färber | 953ffe0 | 2011-06-02 19:58:06 +0200 | [diff] [blame] | 311 | len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", getpid()); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 312 | if (write(fd, buffer, len) != len) { |
Markus Armbruster | 1bbd159 | 2011-11-11 10:40:09 +0100 | [diff] [blame] | 313 | close(fd); |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 314 | return -1; |
| 315 | } |
| 316 | |
Laszlo Ersek | 93dd748 | 2012-01-27 14:34:05 +0100 | [diff] [blame] | 317 | /* keep pidfile open & locked forever */ |
Jes Sorensen | bc4a957 | 2010-10-26 10:39:25 +0200 | [diff] [blame] | 318 | return 0; |
| 319 | } |
Hitoshi Mitake | 995ee2b | 2012-09-15 01:15:41 +0900 | [diff] [blame] | 320 | |
| 321 | bool is_daemonized(void) |
| 322 | { |
| 323 | return daemonize; |
| 324 | } |
Satoru Moriya | 888a6bc | 2013-04-19 16:42:06 +0200 | [diff] [blame] | 325 | |
| 326 | int os_mlock(void) |
| 327 | { |
| 328 | int ret = 0; |
| 329 | |
| 330 | ret = mlockall(MCL_CURRENT | MCL_FUTURE); |
| 331 | if (ret < 0) { |
| 332 | perror("mlockall"); |
| 333 | } |
| 334 | |
| 335 | return ret; |
| 336 | } |