1 /*- 2 * Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org> 3 * Copyright (c) 2014 Vsevolod Stakhov <vsevolod@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/procctl.h> 30 #include <sys/time.h> 31 #include <sys/wait.h> 32 33 #include <err.h> 34 #include <errno.h> 35 #include <getopt.h> 36 #include <signal.h> 37 #include <stdbool.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #define EXIT_TIMEOUT 124 44 #define EXIT_INVALID 125 45 #define EXIT_CMD_ERROR 126 46 #define EXIT_CMD_NOENT 127 47 48 static sig_atomic_t sig_chld = 0; 49 static sig_atomic_t sig_term = 0; 50 static sig_atomic_t sig_alrm = 0; 51 static sig_atomic_t sig_ign = 0; 52 static const char *command = NULL; 53 static bool verbose = false; 54 55 static void 56 usage(void) 57 { 58 59 fprintf(stderr, "Usage: %s [-k time | --kill-after time]" 60 " [-s sig | --signal sig] [-v | --verbose] [--foreground]" 61 " [--preserve-status] <duration> <command> <arg ...>\n", 62 getprogname()); 63 64 exit(EXIT_FAILURE); 65 } 66 67 static double 68 parse_duration(const char *duration) 69 { 70 double ret; 71 char *suffix; 72 73 ret = strtod(duration, &suffix); 74 if (suffix == duration) 75 errx(EXIT_INVALID, "duration is not a number"); 76 77 if (*suffix == '\0') 78 return (ret); 79 80 if (suffix[1] != '\0') 81 errx(EXIT_INVALID, "duration unit suffix too long"); 82 83 switch (*suffix) { 84 case 's': 85 break; 86 case 'm': 87 ret *= 60; 88 break; 89 case 'h': 90 ret *= 60 * 60; 91 break; 92 case 'd': 93 ret *= 60 * 60 * 24; 94 break; 95 default: 96 errx(EXIT_INVALID, "duration unit suffix invalid"); 97 } 98 99 if (ret < 0 || ret >= 100000000UL) 100 errx(EXIT_INVALID, "duration out of range"); 101 102 return (ret); 103 } 104 105 static int 106 parse_signal(const char *str) 107 { 108 int sig, i; 109 const char *errstr; 110 111 sig = strtonum(str, 1, sys_nsig - 1, &errstr); 112 113 if (errstr == NULL) 114 return (sig); 115 116 if (strncasecmp(str, "SIG", 3) == 0) 117 str += 3; 118 119 for (i = 1; i < sys_nsig; i++) { 120 if (strcasecmp(str, sys_signame[i]) == 0) 121 return (i); 122 } 123 124 errx(EXIT_INVALID, "invalid signal"); 125 } 126 127 static void 128 sig_handler(int signo) 129 { 130 if (sig_ign != 0 && signo == sig_ign) { 131 sig_ign = 0; 132 return; 133 } 134 135 switch (signo) { 136 case 0: 137 case SIGINT: 138 case SIGHUP: 139 case SIGQUIT: 140 case SIGTERM: 141 sig_term = signo; 142 break; 143 case SIGCHLD: 144 sig_chld = 1; 145 break; 146 case SIGALRM: 147 sig_alrm = 1; 148 break; 149 } 150 } 151 152 static void 153 send_sig(pid_t pid, int signo) 154 { 155 if (verbose) { 156 warnx("sending signal %s(%d) to command '%s'", 157 sys_signame[signo], signo, command); 158 } 159 kill(pid, signo); 160 } 161 162 static void 163 set_interval(double iv) 164 { 165 struct itimerval tim; 166 167 memset(&tim, 0, sizeof(tim)); 168 tim.it_value.tv_sec = (time_t)iv; 169 iv -= (double)tim.it_value.tv_sec; 170 tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL); 171 172 if (setitimer(ITIMER_REAL, &tim, NULL) == -1) 173 err(EXIT_FAILURE, "setitimer()"); 174 } 175 176 int 177 main(int argc, char **argv) 178 { 179 int ch; 180 int foreground, preserve; 181 int pstat, status; 182 int killsig = SIGTERM; 183 size_t i; 184 pid_t pid, cpid; 185 double first_kill; 186 double second_kill; 187 bool timedout = false; 188 bool do_second_kill = false; 189 bool child_done = false; 190 struct sigaction signals; 191 struct procctl_reaper_status info; 192 struct procctl_reaper_kill killemall; 193 int signums[] = { 194 -1, 195 SIGTERM, 196 SIGINT, 197 SIGHUP, 198 SIGCHLD, 199 SIGALRM, 200 SIGQUIT, 201 }; 202 203 foreground = preserve = 0; 204 second_kill = 0; 205 206 const struct option longopts[] = { 207 { "preserve-status", no_argument, &preserve, 1 }, 208 { "foreground", no_argument, &foreground, 1 }, 209 { "kill-after", required_argument, NULL, 'k'}, 210 { "signal", required_argument, NULL, 's'}, 211 { "help", no_argument, NULL, 'h'}, 212 { "verbose", no_argument, NULL, 'v'}, 213 { NULL, 0, NULL, 0 } 214 }; 215 216 while ((ch = getopt_long(argc, argv, "+k:s:vh", longopts, NULL)) != -1) { 217 switch (ch) { 218 case 'k': 219 do_second_kill = true; 220 second_kill = parse_duration(optarg); 221 break; 222 case 's': 223 killsig = parse_signal(optarg); 224 break; 225 case 'v': 226 verbose = true; 227 break; 228 case 0: 229 break; 230 case 'h': 231 default: 232 usage(); 233 } 234 } 235 236 argc -= optind; 237 argv += optind; 238 239 if (argc < 2) 240 usage(); 241 242 first_kill = parse_duration(argv[0]); 243 argc--; 244 argv++; 245 command = argv[0]; 246 247 if (!foreground) { 248 /* Acquire a reaper */ 249 if (procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL) == -1) 250 err(EXIT_FAILURE, "Fail to acquire the reaper"); 251 } 252 253 memset(&signals, 0, sizeof(signals)); 254 sigemptyset(&signals.sa_mask); 255 256 if (killsig != SIGKILL && killsig != SIGSTOP) 257 signums[0] = killsig; 258 259 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) 260 sigaddset(&signals.sa_mask, signums[i]); 261 262 signals.sa_handler = sig_handler; 263 signals.sa_flags = SA_RESTART; 264 265 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) { 266 if (signums[i] != -1 && signums[i] != 0 && 267 sigaction(signums[i], &signals, NULL) == -1) 268 err(EXIT_FAILURE, "sigaction()"); 269 } 270 271 /* Don't stop if background child needs TTY */ 272 signal(SIGTTIN, SIG_IGN); 273 signal(SIGTTOU, SIG_IGN); 274 275 pid = fork(); 276 if (pid == -1) 277 err(EXIT_FAILURE, "fork()"); 278 else if (pid == 0) { 279 /* child process */ 280 signal(SIGTTIN, SIG_DFL); 281 signal(SIGTTOU, SIG_DFL); 282 283 execvp(argv[0], argv); 284 warn("exec(%s)", argv[0]); 285 _exit(errno == ENOENT ? EXIT_CMD_NOENT : EXIT_CMD_ERROR); 286 } 287 288 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 289 err(EXIT_FAILURE, "sigprocmask()"); 290 291 /* parent continues here */ 292 set_interval(first_kill); 293 294 for (;;) { 295 sigemptyset(&signals.sa_mask); 296 sigsuspend(&signals.sa_mask); 297 298 if (sig_chld) { 299 sig_chld = 0; 300 301 while ((cpid = waitpid(-1, &status, WNOHANG)) != 0) { 302 if (cpid < 0) { 303 if (errno == EINTR) 304 continue; 305 else 306 break; 307 } else if (cpid == pid) { 308 pstat = status; 309 child_done = true; 310 } 311 } 312 if (child_done) { 313 if (foreground) { 314 break; 315 } else { 316 procctl(P_PID, getpid(), 317 PROC_REAP_STATUS, &info); 318 if (info.rs_children == 0) 319 break; 320 } 321 } 322 } else if (sig_alrm) { 323 sig_alrm = 0; 324 325 timedout = true; 326 if (!foreground) { 327 killemall.rk_sig = killsig; 328 killemall.rk_flags = 0; 329 procctl(P_PID, getpid(), PROC_REAP_KILL, 330 &killemall); 331 } else 332 send_sig(pid, killsig); 333 334 if (do_second_kill) { 335 set_interval(second_kill); 336 do_second_kill = false; 337 sig_ign = killsig; 338 killsig = SIGKILL; 339 } else 340 break; 341 342 } else if (sig_term) { 343 if (!foreground) { 344 killemall.rk_sig = sig_term; 345 killemall.rk_flags = 0; 346 procctl(P_PID, getpid(), PROC_REAP_KILL, 347 &killemall); 348 } else 349 send_sig(pid, sig_term); 350 351 if (do_second_kill) { 352 set_interval(second_kill); 353 do_second_kill = false; 354 sig_ign = killsig; 355 killsig = SIGKILL; 356 } else 357 break; 358 } 359 } 360 361 while (!child_done && wait(&pstat) == -1) { 362 if (errno != EINTR) 363 err(EXIT_FAILURE, "waitpid()"); 364 } 365 366 if (!foreground) 367 procctl(P_PID, getpid(), PROC_REAP_RELEASE, NULL); 368 369 if (WEXITSTATUS(pstat)) 370 pstat = WEXITSTATUS(pstat); 371 else if (WIFSIGNALED(pstat)) 372 pstat = 128 + WTERMSIG(pstat); 373 374 if (timedout && !preserve) 375 pstat = EXIT_TIMEOUT; 376 377 return (pstat); 378 } 379