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 [-delmsvz] [-help] [-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;
  99         char            buf[256];
 100         char            *user = NULL;
 101         char            *tty = NULL;
 102         char            *cmd = NULL;
 103         int             vflag = 0;
 104         int             sflag = 0;
 105         int             dflag = 0;
 106         int             eflag = 0;
 107         int             jflag = 0;
 108         int             mflag = 0;
 109         int             zflag = 0;
 110         uid_t           uid = 0;
 111         dev_t           tdev = 0;
 112         pid_t           mypid;
 113         char            thiscmd[MAXCOMLEN + 1];
 114         pid_t           thispid;
 115         uid_t           thisuid;
 116         dev_t           thistdev;
 117         int             sig = SIGTERM;
 118         const char *const *p;
 119         char            *ep;
 120         int             errors = 0;
 121         int             jid;
 122         int             mib[4];
 123         size_t          miblen;
 124         int             st, nprocs;
 125         size_t          size;
 126         int             matched;
 127         int             killed = 0;
 128
 129         setlocale(LC_ALL, "");
 130
 131         av++;
 132         ac--;
 133
 134         while (ac > 0) {
 135                 if (strcmp(*av, "-l") == 0) {
 136                         printsig(stdout);
 137                         exit(0);
 138                 }
 139                 if (strcmp(*av, "-help") == 0)
 140                         usage();
 141                 if (**av == '-') {
 142                         ++*av;
 143                         switch (**av) {
 144                         case 'j':
 145                                 ++*av;
 146                                 if (**av == '\0') {
 147                                         ++av;
 148                                         --ac;
 149                                 }
 150                                 jflag++;
 151                                 if (*av == NULL)
 152                                         errx(1, "must specify jail");
 153                                 jid = jail_getid(*av);
 154                                 if (jid < 0)
 155                                         errx(1, "%s", jail_errmsg);
 156                                 if (jail_attach(jid) == -1)
 157                                         err(1, "jail_attach(%d)", jid);
 158                                 break;
 159                         case 'u':
 160                                 ++*av;
 161                                 if (**av == '\0') {
 162                                         ++av;
 163                                         --ac;
 164                                 }
 165                                 if (*av == NULL)
 166                                         errx(1, "must specify user");
 167                                 user = *av;
 168                                 break;
 169                         case 't':
 170                                 ++*av;
 171                                 if (**av == '\0') {
 172                                         ++av;
 173                                         --ac;
 174                                 }
 175                                 if (*av == NULL)
 176                                         errx(1, "must specify tty");
 177                                 tty = *av;
 178                                 break;
 179                         case 'c':
 180                                 ++*av;
 181                                 if (**av == '\0') {
 182                                         ++av;
 183                                         --ac;
 184                                 }
 185                                 if (*av == NULL)
 186                                         errx(1, "must specify procname");
 187                                 cmd = *av;
 188                                 break;
 189                         case 'v':
 190                                 vflag++;
 191                                 break;
 192                         case 's':
 193                                 sflag++;
 194                                 break;
 195                         case 'd':
 196                                 dflag++;
 197                                 break;
 198                         case 'e':
 199                                 eflag++;
 200                                 break;
 201                         case 'm':
 202                                 mflag++;
 203                                 break;
 204                         case 'z':
 205                                 zflag++;
 206                                 break;
 207                         default:
 208                                 if (isalpha((unsigned char)**av)) {
 209                                         if (strncasecmp(*av, "SIG", 3) == 0)
 210                                                 *av += 3;
 211                                         for (sig = NSIG, p = sys_signame + 1;
 212                                              --sig; ++p)
 213                                                 if (strcasecmp(*p, *av) == 0) {
 214                                                         sig = p - sys_signame;
 215                                                         break;
 216                                                 }
 217                                         if (!sig)
 218                                                 nosig(*av);
 219                                 } else if (isdigit((unsigned char)**av)) {
 220                                         sig = strtol(*av, &ep, 10);
 221                                         if (!*av || *ep)
 222                                                 errx(1, "illegal signal number: %s", *av);
 223                                         if (sig < 0 || sig >= NSIG)
 224                                                 nosig(*av);
 225                                 } else
 226                                         nosig(*av);
 227                         }
 228                         ++av;
 229                         --ac;
 230                 } else {
 231                         break;
 232                 }
 233         }
 234
 235         if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
 236                 usage();
 237
 238         if (tty) {
 239                 if (strncmp(tty, "/dev/", 5) == 0)
 240                         snprintf(buf, sizeof(buf), "%s", tty);
 241                 else if (strncmp(tty, "tty", 3) == 0)
 242                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 243                 else
 244                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 245                 if (stat(buf, &sb) < 0)
 246                         err(1, "stat(%s)", buf);
 247                 if (!S_ISCHR(sb.st_mode))
 248                         errx(1, "%s: not a character device", buf);
 249                 tdev = sb.st_rdev;
 250                 if (dflag)
 251                         printf("ttydev:0x%x\n", tdev);
 252         }
 253         if (user) {
 254                 uid = strtol(user, &ep, 10);
 255                 if (*user == '\0' || *ep != '\0') { /* was it a number? */
 256                         pw = getpwnam(user);
 257                         if (pw == NULL)
 258                                 errx(1, "user %s does not exist", user);
 259                         uid = pw->pw_uid;
 260                         if (dflag)
 261                                 printf("uid:%d\n", uid);
 262                 }
 263         } else {
 264                 uid = getuid();
 265                 if (uid != 0) {
 266                         pw = getpwuid(uid);
 267                         if (pw)
 268                                 user = pw->pw_name;
 269                         if (dflag)
 270                                 printf("uid:%d\n", uid);
 271                 }
 272         }
 273         size = 0;
 274         mib[0] = CTL_KERN;
 275         mib[1] = KERN_PROC;
 276
 277         if (user) {
 278                 mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
 279                 mib[3] = uid;
 280                 miblen = 4;
 281         } else if (tty) {
 282                 mib[2] = KERN_PROC_TTY;
 283                 mib[3] = tdev;
 284                 miblen = 4;
 285         } else {
 286                 mib[2] = KERN_PROC_PROC;
 287                 mib[3] = 0;
 288                 miblen = 3;
 289         }
 290
 291         procs = NULL;
 292         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 293         do {
 294                 size += size / 10;
 295                 newprocs = realloc(procs, size);
 296                 if (newprocs == NULL) {
 297                         free(procs);
 298                         err(1, "could not reallocate memory");
 299                 }
 300                 procs = newprocs;
 301                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 302         } while (st == -1 && errno == ENOMEM);
 303         if (st == -1)
 304                 err(1, "could not sysctl(KERN_PROC)");
 305         if (size % sizeof(struct kinfo_proc) != 0) {
 306                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 307                         size, sizeof(struct kinfo_proc));
 308                 fprintf(stderr, "userland out of sync with kernel\n");
 309                 exit(1);
 310         }
 311         nprocs = size / sizeof(struct kinfo_proc);
 312         if (dflag)
 313                 printf("nprocs %d\n", nprocs);
 314         mypid = getpid();
 315
 316         for (i = 0; i < nprocs; i++) {
 317                 if (procs[i].ki_stat == SZOMB && !zflag)
 318                         continue;
 319                 thispid = procs[i].ki_pid;
 320                 strlcpy(thiscmd, procs[i].ki_comm, sizeof(thiscmd));
 321                 thistdev = procs[i].ki_tdev;
 322                 if (eflag)
 323                         thisuid = procs[i].ki_uid;      /* effective uid */
 324                 else
 325                         thisuid = procs[i].ki_ruid;     /* real uid */
 326
 327                 if (thispid == mypid)
 328                         continue;
 329                 matched = 1;
 330                 if (user) {
 331                         if (thisuid != uid)
 332                                 matched = 0;
 333                 }
 334                 if (tty) {
 335                         if (thistdev != tdev)
 336                                 matched = 0;
 337                 }
 338                 if (cmd) {
 339                         if (mflag) {
 340                                 if (regcomp(&rgx, cmd,
 341                                     REG_EXTENDED|REG_NOSUB) != 0) {
 342                                         mflag = 0;
 343                                         warnx("%s: illegal regexp", cmd);
 344                                 }
 345                         }
 346                         if (mflag) {
 347                                 pmatch.rm_so = 0;
 348                                 pmatch.rm_eo = strlen(thiscmd);
 349                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 350                                     REG_STARTEND) != 0)
 351                                         matched = 0;
 352                                 regfree(&rgx);
 353                         } else {
 354                                 if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
 355                                         matched = 0;
 356                         }
 357                 }
 358                 if (jflag && thispid == getpid())
 359                         matched = 0;
 360                 if (matched == 0)
 361                         continue;
 362                 if (ac > 0)
 363                         matched = 0;
 364                 for (j = 0; j < ac; j++) {
 365                         if (mflag) {
 366                                 if (regcomp(&rgx, av[j],
 367                                     REG_EXTENDED|REG_NOSUB) != 0) {
 368                                         mflag = 0;
 369                                         warnx("%s: illegal regexp", av[j]);
 370                                 }
 371                         }
 372                         if (mflag) {
 373                                 pmatch.rm_so = 0;
 374                                 pmatch.rm_eo = strlen(thiscmd);
 375                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 376                                     REG_STARTEND) == 0)
 377                                         matched = 1;
 378                                 regfree(&rgx);
 379                         } else {
 380                                 if (strcmp(thiscmd, av[j]) == 0)
 381                                         matched = 1;
 382                         }
 383                         if (matched)
 384                                 break;
 385                 }
 386                 if (matched == 0)
 387                         continue;
 388                 if (dflag)
 389                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 390                             thiscmd, thispid, thistdev, thisuid);
 391
 392                 if (vflag || sflag)
 393                         printf("kill -%s %d\n", sys_signame[sig], thispid);
 394
 395                 killed++;
 396                 if (!dflag && !sflag) {
 397                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 398                                 warn("warning: kill -%s %d",
 399                                     sys_signame[sig], thispid);
 400                                 errors = 1;
 401                         }
 402                 }
 403         }
 404         if (killed == 0) {
 405                 fprintf(stderr, "No matching processes %swere found\n",
 406                     getuid() != 0 ? "belonging to you " : "");
 407                 errors = 1;
 408         }
 409         exit(errors);
 410 }