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