usr.bin/killall/killall.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
   5  * Copyright (c) 2000 Paul Saab <ps@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/jail.h>
  35 #include <sys/stat.h>
  36 #include <sys/uio.h>
  37 #include <sys/user.h>
  38 #include <sys/sysctl.h>
  39 #include <fcntl.h>
  40 #include <dirent.h>
  41 #include <jail.h>
  42 #include <stdint.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <pwd.h>
  47 #include <signal.h>
  48 #include <regex.h>
  49 #include <ctype.h>
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <unistd.h>
  53 #include <locale.h>
  54
  55 static void __dead2
  56 usage(void)
  57 {
  58
  59         fprintf(stderr, "usage: killall [-delmsqvz] [-help] [-I] [-j jail]\n");
  60         fprintf(stderr,
  61             "               [-u user] [-t tty] [-c cmd] [-SIGNAL] [cmd]...\n");
  62         fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
  63         exit(1);
  64 }
  65
  66
  67 static void
  68 printsig(FILE *fp)
  69 {
  70         const char      *const * p;
  71         int             cnt;
  72         int             offset = 0;
  73
  74         for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
  75                 offset += fprintf(fp, "%s ", *p);
  76                 if (offset >= 75 && cnt > 1) {
  77                         offset = 0;
  78                         fprintf(fp, "\n");
  79                 }
  80         }
  81         fprintf(fp, "\n");
  82 }
  83
  84 static void
  85 nosig(char *name)
  86 {
  87
  88         warnx("unknown signal %s; valid signals:", name);
  89         printsig(stderr);
  90         exit(1);
  91 }
  92
  93 int
  94 main(int ac, char **av)
  95 {
  96         char            **saved_av;
  97         struct kinfo_proc *procs, *newprocs;
  98         struct stat     sb;
  99         struct passwd   *pw;
 100         regex_t         rgx;
 101         regmatch_t      pmatch;
 102         int             i, j, ch;
 103         char            buf[256];
 104         char            first;
 105         char            *user = NULL;
 106         char            *tty = NULL;
 107         char            *cmd = NULL;
 108         int             qflag = 0;
 109         int             vflag = 0;
 110         int             sflag = 0;
 111         int             dflag = 0;
 112         int             eflag = 0;
 113         int             Iflag = 0;
 114         int             jflag = 0;
 115         int             mflag = 0;
 116         int             zflag = 0;
 117         uid_t           uid = 0;
 118         dev_t           tdev = 0;
 119         pid_t           mypid;
 120         char            thiscmd[MAXCOMLEN + 1];
 121         pid_t           thispid;
 122         uid_t           thisuid;
 123         dev_t           thistdev;
 124         int             sig = SIGTERM;
 125         const char *const *p;
 126         char            *ep;
 127         int             errors = 0;
 128         int             jid;
 129         int             mib[4];
 130         size_t          miblen;
 131         int             st, nprocs;
 132         size_t          size;
 133         int             matched;
 134         int             killed = 0;
 135
 136         setlocale(LC_ALL, "");
 137
 138         av++;
 139         ac--;
 140
 141         while (ac > 0) {
 142                 if (strcmp(*av, "-l") == 0) {
 143                         printsig(stdout);
 144                         exit(0);
 145                 }
 146                 if (strcmp(*av, "-help") == 0)
 147                         usage();
 148                 if (**av == '-') {
 149                         ++*av;
 150                         switch (**av) {
 151                         case 'j':
 152                                 ++*av;
 153                                 if (**av == '\0') {
 154                                         ++av;
 155                                         --ac;
 156                                 }
 157                                 jflag++;
 158                                 if (*av == NULL)
 159                                         errx(1, "must specify jail");
 160                                 jid = jail_getid(*av);
 161                                 if (jid < 0)
 162                                         errx(1, "%s", jail_errmsg);
 163                                 if (jail_attach(jid) == -1)
 164                                         err(1, "jail_attach(%d)", jid);
 165                                 break;
 166                         case 'u':
 167                                 ++*av;
 168                                 if (**av == '\0') {
 169                                         ++av;
 170                                         --ac;
 171                                 }
 172                                 if (*av == NULL)
 173                                         errx(1, "must specify user");
 174                                 user = *av;
 175                                 break;
 176                         case 't':
 177                                 ++*av;
 178                                 if (**av == '\0') {
 179                                         ++av;
 180                                         --ac;
 181                                 }
 182                                 if (*av == NULL)
 183                                         errx(1, "must specify tty");
 184                                 tty = *av;
 185                                 break;
 186                         case 'c':
 187                                 ++*av;
 188                                 if (**av == '\0') {
 189                                         ++av;
 190                                         --ac;
 191                                 }
 192                                 if (*av == NULL)
 193                                         errx(1, "must specify procname");
 194                                 cmd = *av;
 195                                 break;
 196                         case 'q':
 197                                 qflag++;
 198                                 break;
 199                         case 'v':
 200                                 vflag++;
 201                                 break;
 202                         case 's':
 203                                 sflag++;
 204                                 break;
 205                         case 'd':
 206                                 dflag++;
 207                                 break;
 208                         case 'e':
 209                                 eflag++;
 210                                 break;
 211                         case 'm':
 212                                 mflag++;
 213                                 break;
 214                         case 'z':
 215                                 zflag++;
 216                                 break;
 217                         default:
 218                                 saved_av = av;
 219                                 if (isalpha((unsigned char)**av)) {
 220                                         if (strncasecmp(*av, "SIG", 3) == 0)
 221                                                 *av += 3;
 222                                         for (sig = NSIG, p = sys_signame + 1;
 223                                              --sig; ++p)
 224                                                 if (strcasecmp(*p, *av) == 0) {
 225                                                         sig = p - sys_signame;
 226                                                         break;
 227                                                 }
 228                                         if (!sig) {
 229                                                 if (**saved_av == 'I') {
 230                                                         av = saved_av;
 231                                                         Iflag = 1;
 232                                                         break;
 233                                                 } else
 234                                                         nosig(*av);
 235                                         }
 236                                 } else if (isdigit((unsigned char)**av)) {
 237                                         sig = strtol(*av, &ep, 10);
 238                                         if (!*av || *ep)
 239                                                 errx(1, "illegal signal number: %s", *av);
 240                                         if (sig < 0 || sig >= NSIG)
 241                                                 nosig(*av);
 242                                 } else
 243                                         nosig(*av);
 244                         }
 245                         ++av;
 246                         --ac;
 247                 } else {
 248                         break;
 249                 }
 250         }
 251
 252         if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
 253                 usage();
 254
 255         if (tty) {
 256                 if (strncmp(tty, "/dev/", 5) == 0)
 257                         snprintf(buf, sizeof(buf), "%s", tty);
 258                 else if (strncmp(tty, "tty", 3) == 0)
 259                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 260                 else
 261                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 262                 if (stat(buf, &sb) < 0)
 263                         err(1, "stat(%s)", buf);
 264                 if (!S_ISCHR(sb.st_mode))
 265                         errx(1, "%s: not a character device", buf);
 266                 tdev = sb.st_rdev;
 267                 if (dflag)
 268                         printf("ttydev:0x%jx\n", (uintmax_t)tdev);
 269         }
 270         if (user) {
 271                 uid = strtol(user, &ep, 10);
 272                 if (*user == '\0' || *ep != '\0') { /* was it a number? */
 273                         pw = getpwnam(user);
 274                         if (pw == NULL)
 275                                 errx(1, "user %s does not exist", user);
 276                         uid = pw->pw_uid;
 277                         if (dflag)
 278                                 printf("uid:%d\n", uid);
 279                 }
 280         } else {
 281                 uid = getuid();
 282                 if (uid != 0) {
 283                         pw = getpwuid(uid);
 284                         if (pw)
 285                                 user = pw->pw_name;
 286                         if (dflag)
 287                                 printf("uid:%d\n", uid);
 288                 }
 289         }
 290         size = 0;
 291         mib[0] = CTL_KERN;
 292         mib[1] = KERN_PROC;
 293
 294         if (user) {
 295                 mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
 296                 mib[3] = uid;
 297                 miblen = 4;
 298         } else if (tty) {
 299                 mib[2] = KERN_PROC_TTY;
 300                 mib[3] = tdev;
 301                 miblen = 4;
 302         } else {
 303                 mib[2] = KERN_PROC_PROC;
 304                 mib[3] = 0;
 305                 miblen = 3;
 306         }
 307
 308         procs = NULL;
 309         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 310         do {
 311                 size += size / 10;
 312                 newprocs = realloc(procs, size);
 313                 if (newprocs == NULL) {
 314                         free(procs);
 315                         err(1, "could not reallocate memory");
 316                 }
 317                 procs = newprocs;
 318                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 319         } while (st == -1 && errno == ENOMEM);
 320         if (st == -1)
 321                 err(1, "could not sysctl(KERN_PROC)");
 322         if (size % sizeof(struct kinfo_proc) != 0) {
 323                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 324                         size, sizeof(struct kinfo_proc));
 325                 fprintf(stderr, "userland out of sync with kernel\n");
 326                 exit(1);
 327         }
 328         nprocs = size / sizeof(struct kinfo_proc);
 329         if (dflag)
 330                 printf("nprocs %d\n", nprocs);
 331         mypid = getpid();
 332
 333         for (i = 0; i < nprocs; i++) {
 334                 if (procs[i].ki_stat == SZOMB && !zflag)
 335                         continue;
 336                 thispid = procs[i].ki_pid;
 337                 strlcpy(thiscmd, procs[i].ki_comm, sizeof(thiscmd));
 338                 thistdev = procs[i].ki_tdev;
 339                 if (eflag)
 340                         thisuid = procs[i].ki_uid;      /* effective uid */
 341                 else
 342                         thisuid = procs[i].ki_ruid;     /* real uid */
 343
 344                 if (thispid == mypid)
 345                         continue;
 346                 matched = 1;
 347                 if (user) {
 348                         if (thisuid != uid)
 349                                 matched = 0;
 350                 }
 351                 if (tty) {
 352                         if (thistdev != tdev)
 353                                 matched = 0;
 354                 }
 355                 if (cmd) {
 356                         if (mflag) {
 357                                 if (regcomp(&rgx, cmd,
 358                                     REG_EXTENDED|REG_NOSUB) != 0) {
 359                                         mflag = 0;
 360                                         warnx("%s: illegal regexp", cmd);
 361                                 }
 362                         }
 363                         if (mflag) {
 364                                 pmatch.rm_so = 0;
 365                                 pmatch.rm_eo = strlen(thiscmd);
 366                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 367                                     REG_STARTEND) != 0)
 368                                         matched = 0;
 369                                 regfree(&rgx);
 370                         } else {
 371                                 if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
 372                                         matched = 0;
 373                         }
 374                 }
 375                 if (jflag && thispid == getpid())
 376                         matched = 0;
 377                 if (matched == 0)
 378                         continue;
 379                 if (ac > 0)
 380                         matched = 0;
 381                 for (j = 0; j < ac; j++) {
 382                         if (mflag) {
 383                                 if (regcomp(&rgx, av[j],
 384                                     REG_EXTENDED|REG_NOSUB) != 0) {
 385                                         mflag = 0;
 386                                         warnx("%s: illegal regexp", av[j]);
 387                                 }
 388                         }
 389                         if (mflag) {
 390                                 pmatch.rm_so = 0;
 391                                 pmatch.rm_eo = strlen(thiscmd);
 392                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 393                                     REG_STARTEND) == 0)
 394                                         matched = 1;
 395                                 regfree(&rgx);
 396                         } else {
 397                                 if (strcmp(thiscmd, av[j]) == 0)
 398                                         matched = 1;
 399                         }
 400                         if (matched)
 401                                 break;
 402                 }
 403                 if (matched != 0 && Iflag) {
 404                         printf("Send signal %d to %s (pid %d uid %d)? ",
 405                                 sig, thiscmd, thispid, thisuid);
 406                         fflush(stdout);
 407                         first = ch = getchar();
 408                         while (ch != '\n' && ch != EOF)
 409                                 ch = getchar();
 410                         if (first != 'y' && first != 'Y')
 411                                 matched = 0;
 412                 }
 413                 if (matched == 0)
 414                         continue;
 415                 if (dflag)
 416                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%jx uid:%d\n",
 417                             sig, thiscmd, thispid, (uintmax_t)thistdev,
 418                             thisuid);
 419
 420                 if (vflag || sflag)
 421                         printf("kill -%s %d\n", sys_signame[sig], thispid);
 422
 423                 killed++;
 424                 if (!dflag && !sflag) {
 425                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 426                                 warn("warning: kill -%s %d",
 427                                     sys_signame[sig], thispid);
 428                                 errors = 1;
 429                         }
 430                 }
 431         }
 432         if (killed == 0) {
 433                 if (!qflag)
 434                         fprintf(stderr, "No matching processes %swere found\n",
 435                             getuid() != 0 ? "belonging to you " : "");
 436                 errors = 1;
 437         }
 438         exit(errors);
 439 }