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/user.h>
  35 #include <sys/sysctl.h>
  36 #include <fcntl.h>
  37 #include <dirent.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <pwd.h>
  42 #include <signal.h>
  43 #include <regex.h>
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <unistd.h>
  48 #include <locale.h>
  49
  50 static void __dead2
  51 usage(void)
  52 {
  53
  54         fprintf(stderr, "usage: killall [-delmsvz] [-help] [-j jid]\n");
  55         fprintf(stderr,
  56             "               [-u user] [-t tty] [-c cmd] [-SIGNAL] [cmd]...\n");
  57         fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
  58         exit(1);
  59 }
  60
  61 static char *
  62 upper(const char *str)
  63 {
  64         static char buf[80];
  65         char *s;
  66
  67         strlcpy(buf, str, sizeof(buf));
  68         for (s = buf; *s; s++)
  69                 *s = toupper((unsigned char)*s);
  70         return buf;
  71 }
  72
  73
  74 static void
  75 printsig(FILE *fp)
  76 {
  77         const char      *const * p;
  78         int             cnt;
  79         int             offset = 0;
  80
  81         for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
  82                 offset += fprintf(fp, "%s ", upper(*p));
  83                 if (offset >= 75 && cnt > 1) {
  84                         offset = 0;
  85                         fprintf(fp, "\n");
  86                 }
  87         }
  88         fprintf(fp, "\n");
  89 }
  90
  91 static void
  92 nosig(char *name)
  93 {
  94
  95         warnx("unknown signal %s; valid signals:", name);
  96         printsig(stderr);
  97         exit(1);
  98 }
  99
 100 int
 101 main(int ac, char **av)
 102 {
 103         struct kinfo_proc *procs = NULL, *newprocs;
 104         struct stat     sb;
 105         struct passwd   *pw;
 106         regex_t         rgx;
 107         regmatch_t      pmatch;
 108         int             i, j;
 109         char            buf[256];
 110         char            *user = NULL;
 111         char            *tty = NULL;
 112         char            *cmd = NULL;
 113         int             vflag = 0;
 114         int             sflag = 0;
 115         int             dflag = 0;
 116         int             eflag = 0;
 117         int             jflag = 0;
 118         int             mflag = 0;
 119         int             zflag = 0;
 120         uid_t           uid = 0;
 121         dev_t           tdev = 0;
 122         pid_t           mypid;
 123         char            thiscmd[MAXCOMLEN + 1];
 124         pid_t           thispid;
 125         uid_t           thisuid;
 126         dev_t           thistdev;
 127         int             sig = SIGTERM;
 128         const char *const *p;
 129         char            *ep;
 130         int             errors = 0;
 131         int             jid;
 132         int             mib[4];
 133         size_t          miblen;
 134         int             st, nprocs;
 135         size_t          size;
 136         int             matched;
 137         int             killed = 0;
 138
 139         setlocale(LC_ALL, "");
 140
 141         av++;
 142         ac--;
 143
 144         while (ac > 0) {
 145                 if (strcmp(*av, "-l") == 0) {
 146                         printsig(stdout);
 147                         exit(0);
 148                 }
 149                 if (strcmp(*av, "-help") == 0)
 150                         usage();
 151                 if (**av == '-') {
 152                         ++*av;
 153                         switch (**av) {
 154                         case 'j':
 155                                 ++*av;
 156                                 if (**av == '\0') {
 157                                         ++av;
 158                                         --ac;
 159                                 }
 160                                 jflag++;
 161                                 if (*av == NULL)
 162                                         errx(1, "must specify jid");
 163                                 jid = strtol(*av, &ep, 10);
 164                                 if (!*av || *ep)
 165                                         errx(1, "illegal jid: %s", *av);
 166                                 if (jail_attach(jid) == -1)
 167                                         err(1, "jail_attach(): %d", jid);
 168                                 break;
 169                         case 'u':
 170                                 ++*av;
 171                                 if (**av == '\0') {
 172                                         ++av;
 173                                         --ac;
 174                                 }
 175                                 if (*av == NULL)
 176                                         errx(1, "must specify user");
 177                                 user = *av;
 178                                 break;
 179                         case 't':
 180                                 ++*av;
 181                                 if (**av == '\0') {
 182                                         ++av;
 183                                         --ac;
 184                                 }
 185                                 if (*av == NULL)
 186                                         errx(1, "must specify tty");
 187                                 tty = *av;
 188                                 break;
 189                         case 'c':
 190                                 ++*av;
 191                                 if (**av == '\0') {
 192                                         ++av;
 193                                         --ac;
 194                                 }
 195                                 if (*av == NULL)
 196                                         errx(1, "must specify procname");
 197                                 cmd = *av;
 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                                 if (isalpha((unsigned char)**av)) {
 219                                         if (strncasecmp(*av, "sig", 3) == 0)
 220                                                 *av += 3;
 221                                         for (sig = NSIG, p = sys_signame + 1;
 222                                              --sig; ++p)
 223                                                 if (strcasecmp(*p, *av) == 0) {
 224                                                         sig = p - sys_signame;
 225                                                         break;
 226                                                 }
 227                                         if (!sig)
 228                                                 nosig(*av);
 229                                 } else if (isdigit((unsigned char)**av)) {
 230                                         sig = strtol(*av, &ep, 10);
 231                                         if (!*av || *ep)
 232                                                 errx(1, "illegal signal number: %s", *av);
 233                                         if (sig < 0 || sig >= NSIG)
 234                                                 nosig(*av);
 235                                 } else
 236                                         nosig(*av);
 237                         }
 238                         ++av;
 239                         --ac;
 240                 } else {
 241                         break;
 242                 }
 243         }
 244
 245         if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
 246                 usage();
 247
 248         if (tty) {
 249                 if (strncmp(tty, "/dev/", 5) == 0)
 250                         snprintf(buf, sizeof(buf), "%s", tty);
 251                 else if (strncmp(tty, "tty", 3) == 0)
 252                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 253                 else
 254                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 255                 if (stat(buf, &sb) < 0)
 256                         err(1, "stat(%s)", buf);
 257                 if (!S_ISCHR(sb.st_mode))
 258                         errx(1, "%s: not a character device", buf);
 259                 tdev = sb.st_rdev;
 260                 if (dflag)
 261                         printf("ttydev:0x%x\n", tdev);
 262         }
 263         if (user) {
 264                 uid = strtol(user, &ep, 10);
 265                 if (*user == '\0' || *ep != '\0') { /* was it a number? */
 266                         pw = getpwnam(user);
 267                         if (pw == NULL)
 268                                 errx(1, "user %s does not exist", user);
 269                         uid = pw->pw_uid;
 270                         if (dflag)
 271                                 printf("uid:%d\n", uid);
 272                 }
 273         } else {
 274                 uid = getuid();
 275                 if (uid != 0) {
 276                         pw = getpwuid(uid);
 277                         if (pw)
 278                                 user = pw->pw_name;
 279                         if (dflag)
 280                                 printf("uid:%d\n", uid);
 281                 }
 282         }
 283         size = 0;
 284         mib[0] = CTL_KERN;
 285         mib[1] = KERN_PROC;
 286         mib[2] = KERN_PROC_PROC;
 287         mib[3] = 0;
 288         miblen = 3;
 289
 290         if (user) {
 291                 mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
 292                 mib[3] = uid;
 293                 miblen = 4;
 294         } else if (tty) {
 295                 mib[2] = KERN_PROC_TTY;
 296                 mib[3] = tdev;
 297                 miblen = 4;
 298         }
 299
 300         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 301         do {
 302                 size += size / 10;
 303                 newprocs = realloc(procs, size);
 304                 if (newprocs == 0) {
 305                         if (procs)
 306                                 free(procs);
 307                         errx(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, recompile libkvm etc\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) == 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)
 396                         continue;
 397                 if (dflag)
 398                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 399                             thiscmd, thispid, thistdev, thisuid);
 400
 401                 if (vflag || sflag)
 402                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 403                             thispid);
 404
 405                 killed++;
 406                 if (!dflag && !sflag) {
 407                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 408                                 warn("warning: kill -%s %d",
 409                                     upper(sys_signame[sig]), thispid);
 410                                 errors = 1;
 411                         }
 412                 }
 413         }
 414         if (killed == 0) {
 415                 fprintf(stderr, "No matching processes %swere found\n",
 416                     getuid() != 0 ? "belonging to you " : "");
 417                 errors = 1;
 418         }
 419         exit(errors);
 420 }