usr.bin/killall/killall.c

   1 /*-
   2  * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
   3  * Copyright (c) 2000 Paul Saab <ps@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  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/jail.h>
  33 #include <sys/stat.h>
  34 #include <sys/uio.h>
  35 #include <sys/user.h>
  36 #include <sys/sysctl.h>
  37 #include <fcntl.h>
  38 #include <dirent.h>
  39 #include <jail.h>
  40 #include <stdint.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <pwd.h>
  45 #include <signal.h>
  46 #include <regex.h>
  47 #include <ctype.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <unistd.h>
  51 #include <locale.h>
  52
  53 static void __dead2
  54 usage(void)
  55 {
  56
  57         fprintf(stderr, "usage: killall [-delmsqvz] [-help] [-I] [-j jail]\n");
  58         fprintf(stderr,
  59             "               [-u user] [-t tty] [-c cmd] [-SIGNAL] [cmd]...\n");
  60         fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
  61         exit(1);
  62 }
  63
  64
  65 static void
  66 printsig(FILE *fp)
  67 {
  68         const char      *const * p;
  69         int             cnt;
  70         int             offset = 0;
  71
  72         for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
  73                 offset += fprintf(fp, "%s ", *p);
  74                 if (offset >= 75 && cnt > 1) {
  75                         offset = 0;
  76                         fprintf(fp, "\n");
  77                 }
  78         }
  79         fprintf(fp, "\n");
  80 }
  81
  82 static void
  83 nosig(char *name)
  84 {
  85
  86         warnx("unknown signal %s; valid signals:", name);
  87         printsig(stderr);
  88         exit(1);
  89 }
  90
  91 int
  92 main(int ac, char **av)
  93 {
  94         char            **saved_av;
  95         struct kinfo_proc *procs, *newprocs;
  96         struct stat     sb;
  97         struct passwd   *pw;
  98         regex_t         rgx;
  99         regmatch_t      pmatch;
 100         int             i, j, ch;
 101         char            buf[256];
 102         char            first;
 103         char            *user = NULL;
 104         char            *tty = NULL;
 105         char            *cmd = NULL;
 106         int             qflag = 0;
 107         int             vflag = 0;
 108         int             sflag = 0;
 109         int             dflag = 0;
 110         int             eflag = 0;
 111         int             Iflag = 0;
 112         int             jflag = 0;
 113         int             mflag = 0;
 114         int             zflag = 0;
 115         uid_t           uid = 0;
 116         dev_t           tdev = 0;
 117         pid_t           mypid;
 118         char            thiscmd[MAXCOMLEN + 1];
 119         pid_t           thispid;
 120         uid_t           thisuid;
 121         dev_t           thistdev;
 122         int             sig = SIGTERM;
 123         const char *const *p;
 124         char            *ep;
 125         int             errors = 0;
 126         int             jid;
 127         int             mib[4];
 128         size_t          miblen;
 129         int             st, nprocs;
 130         size_t          size;
 131         int             matched;
 132         int             killed = 0;
 133
 134         setlocale(LC_ALL, "");
 135
 136         av++;
 137         ac--;
 138
 139         while (ac > 0) {
 140                 if (strcmp(*av, "-l") == 0) {
 141                         printsig(stdout);
 142                         exit(0);
 143                 }
 144                 if (strcmp(*av, "-help") == 0)
 145                         usage();
 146                 if (**av == '-') {
 147                         ++*av;
 148                         switch (**av) {
 149                         case 'j':
 150                                 ++*av;
 151                                 if (**av == '\0') {
 152                                         ++av;
 153                                         --ac;
 154                                 }
 155                                 jflag++;
 156                                 if (*av == NULL)
 157                                         errx(1, "must specify jail");
 158                                 jid = jail_getid(*av);
 159                                 if (jid < 0)
 160                                         errx(1, "%s", jail_errmsg);
 161                                 if (jail_attach(jid) == -1)
 162                                         err(1, "jail_attach(%d)", jid);
 163                                 break;
 164                         case 'u':
 165                                 ++*av;
 166                                 if (**av == '\0') {
 167                                         ++av;
 168                                         --ac;
 169                                 }
 170                                 if (*av == NULL)
 171                                         errx(1, "must specify user");
 172                                 user = *av;
 173                                 break;
 174                         case 't':
 175                                 ++*av;
 176                                 if (**av == '\0') {
 177                                         ++av;
 178                                         --ac;
 179                                 }
 180                                 if (*av == NULL)
 181                                         errx(1, "must specify tty");
 182                                 tty = *av;
 183                                 break;
 184                         case 'c':
 185                                 ++*av;
 186                                 if (**av == '\0') {
 187                                         ++av;
 188                                         --ac;
 189                                 }
 190                                 if (*av == NULL)
 191                                         errx(1, "must specify procname");
 192                                 cmd = *av;
 193                                 break;
 194                         case 'q':
 195                                 qflag++;
 196                                 break;
 197                         case 'v':
 198                                 vflag++;
 199                                 break;
 200                         case 's':
 201                                 sflag++;
 202                                 break;
 203                         case 'd':
 204                                 dflag++;
 205                                 break;
 206                         case 'e':
 207                                 eflag++;
 208                                 break;
 209                         case 'm':
 210                                 mflag++;
 211                                 break;
 212                         case 'z':
 213                                 zflag++;
 214                                 break;
 215                         default:
 216                                 saved_av = av;
 217                                 if (isalpha((unsigned char)**av)) {
 218                                         if (strncasecmp(*av, "SIG", 3) == 0)
 219                                                 *av += 3;
 220                                         for (sig = NSIG, p = sys_signame + 1;
 221                                              --sig; ++p)
 222                                                 if (strcasecmp(*p, *av) == 0) {
 223                                                         sig = p - sys_signame;
 224                                                         break;
 225                                                 }
 226                                         if (!sig) {
 227                                                 if (**saved_av == 'I') {
 228                                                         av = saved_av;
 229                                                         Iflag = 1;
 230                                                         break;
 231                                                 } else
 232                                                         nosig(*av);
 233                                         }
 234                                 } else if (isdigit((unsigned char)**av)) {
 235                                         sig = strtol(*av, &ep, 10);
 236                                         if (!*av || *ep)
 237                                                 errx(1, "illegal signal number: %s", *av);
 238                                         if (sig < 0 || sig >= NSIG)
 239                                                 nosig(*av);
 240                                 } else
 241                                         nosig(*av);
 242                         }
 243                         ++av;
 244                         --ac;
 245                 } else {
 246                         break;
 247                 }
 248         }
 249
 250         if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
 251                 usage();
 252
 253         if (tty) {
 254                 if (strncmp(tty, "/dev/", 5) == 0)
 255                         snprintf(buf, sizeof(buf), "%s", tty);
 256                 else if (strncmp(tty, "tty", 3) == 0)
 257                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 258                 else
 259                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 260                 if (stat(buf, &sb) < 0)
 261                         err(1, "stat(%s)", buf);
 262                 if (!S_ISCHR(sb.st_mode))
 263                         errx(1, "%s: not a character device", buf);
 264                 tdev = sb.st_rdev;
 265                 if (dflag)
 266                         printf("ttydev:0x%jx\n", (uintmax_t)tdev);
 267         }
 268         if (user) {
 269                 uid = strtol(user, &ep, 10);
 270                 if (*user == '\0' || *ep != '\0') { /* was it a number? */
 271                         pw = getpwnam(user);
 272                         if (pw == NULL)
 273                                 errx(1, "user %s does not exist", user);
 274                         uid = pw->pw_uid;
 275                         if (dflag)
 276                                 printf("uid:%d\n", uid);
 277                 }
 278         } else {
 279                 uid = getuid();
 280                 if (uid != 0) {
 281                         pw = getpwuid(uid);
 282                         if (pw)
 283                                 user = pw->pw_name;
 284                         if (dflag)
 285                                 printf("uid:%d\n", uid);
 286                 }
 287         }
 288         size = 0;
 289         mib[0] = CTL_KERN;
 290         mib[1] = KERN_PROC;
 291
 292         if (user) {
 293                 mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
 294                 mib[3] = uid;
 295                 miblen = 4;
 296         } else if (tty) {
 297                 mib[2] = KERN_PROC_TTY;
 298                 mib[3] = tdev;
 299                 miblen = 4;
 300         } else {
 301                 mib[2] = KERN_PROC_PROC;
 302                 mib[3] = 0;
 303                 miblen = 3;
 304         }
 305
 306         procs = NULL;
 307         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 308         do {
 309                 size += size / 10;
 310                 newprocs = realloc(procs, size);
 311                 if (newprocs == NULL) {
 312                         free(procs);
 313                         err(1, "could not reallocate memory");
 314                 }
 315                 procs = newprocs;
 316                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 317         } while (st == -1 && errno == ENOMEM);
 318         if (st == -1)
 319                 err(1, "could not sysctl(KERN_PROC)");
 320         if (size % sizeof(struct kinfo_proc) != 0) {
 321                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 322                         size, sizeof(struct kinfo_proc));
 323                 fprintf(stderr, "userland out of sync with kernel\n");
 324                 exit(1);
 325         }
 326         nprocs = size / sizeof(struct kinfo_proc);
 327         if (dflag)
 328                 printf("nprocs %d\n", nprocs);
 329         mypid = getpid();
 330
 331         for (i = 0; i < nprocs; i++) {
 332                 if (procs[i].ki_stat == SZOMB && !zflag)
 333                         continue;
 334                 thispid = procs[i].ki_pid;
 335                 strlcpy(thiscmd, procs[i].ki_comm, sizeof(thiscmd));
 336                 thistdev = procs[i].ki_tdev;
 337                 if (eflag)
 338                         thisuid = procs[i].ki_uid;      /* effective uid */
 339                 else
 340                         thisuid = procs[i].ki_ruid;     /* real uid */
 341
 342                 if (thispid == mypid)
 343                         continue;
 344                 matched = 1;
 345                 if (user) {
 346                         if (thisuid != uid)
 347                                 matched = 0;
 348                 }
 349                 if (tty) {
 350                         if (thistdev != tdev)
 351                                 matched = 0;
 352                 }
 353                 if (cmd) {
 354                         if (mflag) {
 355                                 if (regcomp(&rgx, cmd,
 356                                     REG_EXTENDED|REG_NOSUB) != 0) {
 357                                         mflag = 0;
 358                                         warnx("%s: illegal regexp", cmd);
 359                                 }
 360                         }
 361                         if (mflag) {
 362                                 pmatch.rm_so = 0;
 363                                 pmatch.rm_eo = strlen(thiscmd);
 364                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 365                                     REG_STARTEND) != 0)
 366                                         matched = 0;
 367                                 regfree(&rgx);
 368                         } else {
 369                                 if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
 370                                         matched = 0;
 371                         }
 372                 }
 373                 if (jflag && thispid == getpid())
 374                         matched = 0;
 375                 if (matched == 0)
 376                         continue;
 377                 if (ac > 0)
 378                         matched = 0;
 379                 for (j = 0; j < ac; j++) {
 380                         if (mflag) {
 381                                 if (regcomp(&rgx, av[j],
 382                                     REG_EXTENDED|REG_NOSUB) != 0) {
 383                                         mflag = 0;
 384                                         warnx("%s: illegal regexp", av[j]);
 385                                 }
 386                         }
 387                         if (mflag) {
 388                                 pmatch.rm_so = 0;
 389                                 pmatch.rm_eo = strlen(thiscmd);
 390                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 391                                     REG_STARTEND) == 0)
 392                                         matched = 1;
 393                                 regfree(&rgx);
 394                         } else {
 395                                 if (strcmp(thiscmd, av[j]) == 0)
 396                                         matched = 1;
 397                         }
 398                         if (matched)
 399                                 break;
 400                 }
 401                 if (matched != 0 && Iflag) {
 402                         printf("Send signal %d to %s (pid %d uid %d)? ",
 403                                 sig, thiscmd, thispid, thisuid);
 404                         fflush(stdout);
 405                         first = ch = getchar();
 406                         while (ch != '\n' && ch != EOF)
 407                                 ch = getchar();
 408                         if (first != 'y' && first != 'Y')
 409                                 matched = 0;
 410                 }
 411                 if (matched == 0)
 412                         continue;
 413                 if (dflag)
 414                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%jx uid:%d\n",
 415                             sig, thiscmd, thispid, (uintmax_t)thistdev,
 416                             thisuid);
 417
 418                 if (vflag || sflag)
 419                         printf("kill -%s %d\n", sys_signame[sig], thispid);
 420
 421                 killed++;
 422                 if (!dflag && !sflag) {
 423                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 424                                 warn("warning: kill -%s %d",
 425                                     sys_signame[sig], thispid);
 426                                 errors = 1;
 427                         }
 428                 }
 429         }
 430         if (killed == 0) {
 431                 if (!qflag)
 432                         fprintf(stderr, "No matching processes %swere found\n",
 433                             getuid() != 0 ? "belonging to you " : "");
 434                 errors = 1;
 435         }
 436         exit(errors);
 437 }