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