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