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 static char *
  64 upper(const char *str)
  65 {
  66         static char buf[80];
  67         char *s;
  68
  69         strlcpy(buf, str, sizeof(buf));
  70         for (s = buf; *s; s++)
  71                 *s = toupper((unsigned char)*s);
  72         return buf;
  73 }
  74
  75
  76 static void
  77 printsig(FILE *fp)
  78 {
  79         const char      *const * p;
  80         int             cnt;
  81         int             offset = 0;
  82
  83         for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
  84                 offset += fprintf(fp, "%s ", upper(*p));
  85                 if (offset >= 75 && cnt > 1) {
  86                         offset = 0;
  87                         fprintf(fp, "\n");
  88                 }
  89         }
  90         fprintf(fp, "\n");
  91 }
  92
  93 static void
  94 nosig(char *name)
  95 {
  96
  97         warnx("unknown signal %s; valid signals:", name);
  98         printsig(stderr);
  99         exit(1);
 100 }
 101
 102 int
 103 main(int ac, char **av)
 104 {
 105         struct kinfo_proc *procs = NULL, *newprocs;
 106         struct stat     sb;
 107         struct passwd   *pw;
 108         regex_t         rgx;
 109         regmatch_t      pmatch;
 110         int             i, j;
 111         char            buf[256];
 112         char            *user = NULL;
 113         char            *tty = NULL;
 114         char            *cmd = NULL;
 115         int             vflag = 0;
 116         int             sflag = 0;
 117         int             dflag = 0;
 118         int             eflag = 0;
 119         int             jflag = 0;
 120         int             mflag = 0;
 121         int             zflag = 0;
 122         uid_t           uid = 0;
 123         dev_t           tdev = 0;
 124         pid_t           mypid;
 125         char            thiscmd[MAXCOMLEN + 1];
 126         pid_t           thispid;
 127         uid_t           thisuid;
 128         dev_t           thistdev;
 129         int             sig = SIGTERM;
 130         const char *const *p;
 131         char            *ep;
 132         int             errors = 0;
 133         int             jid;
 134         int             mib[4];
 135         size_t          miblen;
 136         int             st, nprocs;
 137         size_t          size;
 138         int             matched;
 139         int             killed = 0;
 140
 141         setlocale(LC_ALL, "");
 142
 143         av++;
 144         ac--;
 145
 146         while (ac > 0) {
 147                 if (strcmp(*av, "-l") == 0) {
 148                         printsig(stdout);
 149                         exit(0);
 150                 }
 151                 if (strcmp(*av, "-help") == 0)
 152                         usage();
 153                 if (**av == '-') {
 154                         ++*av;
 155                         switch (**av) {
 156                         case 'j':
 157                                 ++*av;
 158                                 if (**av == '\0') {
 159                                         ++av;
 160                                         --ac;
 161                                 }
 162                                 jflag++;
 163                                 if (*av == NULL)
 164                                         errx(1, "must specify jail");
 165                                 jid = jail_getid(*av);
 166                                 if (jid < 0)
 167                                         errx(1, "%s", jail_errmsg);
 168                                 if (jail_attach(jid) == -1)
 169                                         err(1, "jail_attach(%d)", jid);
 170                                 break;
 171                         case 'u':
 172                                 ++*av;
 173                                 if (**av == '\0') {
 174                                         ++av;
 175                                         --ac;
 176                                 }
 177                                 if (*av == NULL)
 178                                         errx(1, "must specify user");
 179                                 user = *av;
 180                                 break;
 181                         case 't':
 182                                 ++*av;
 183                                 if (**av == '\0') {
 184                                         ++av;
 185                                         --ac;
 186                                 }
 187                                 if (*av == NULL)
 188                                         errx(1, "must specify tty");
 189                                 tty = *av;
 190                                 break;
 191                         case 'c':
 192                                 ++*av;
 193                                 if (**av == '\0') {
 194                                         ++av;
 195                                         --ac;
 196                                 }
 197                                 if (*av == NULL)
 198                                         errx(1, "must specify procname");
 199                                 cmd = *av;
 200                                 break;
 201                         case 'v':
 202                                 vflag++;
 203                                 break;
 204                         case 's':
 205                                 sflag++;
 206                                 break;
 207                         case 'd':
 208                                 dflag++;
 209                                 break;
 210                         case 'e':
 211                                 eflag++;
 212                                 break;
 213                         case 'm':
 214                                 mflag++;
 215                                 break;
 216                         case 'z':
 217                                 zflag++;
 218                                 break;
 219                         default:
 220                                 if (isalpha((unsigned char)**av)) {
 221                                         if (strncasecmp(*av, "sig", 3) == 0)
 222                                                 *av += 3;
 223                                         for (sig = NSIG, p = sys_signame + 1;
 224                                              --sig; ++p)
 225                                                 if (strcasecmp(*p, *av) == 0) {
 226                                                         sig = p - sys_signame;
 227                                                         break;
 228                                                 }
 229                                         if (!sig)
 230                                                 nosig(*av);
 231                                 } else if (isdigit((unsigned char)**av)) {
 232                                         sig = strtol(*av, &ep, 10);
 233                                         if (!*av || *ep)
 234                                                 errx(1, "illegal signal number: %s", *av);
 235                                         if (sig < 0 || sig >= NSIG)
 236                                                 nosig(*av);
 237                                 } else
 238                                         nosig(*av);
 239                         }
 240                         ++av;
 241                         --ac;
 242                 } else {
 243                         break;
 244                 }
 245         }
 246
 247         if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
 248                 usage();
 249
 250         if (tty) {
 251                 if (strncmp(tty, "/dev/", 5) == 0)
 252                         snprintf(buf, sizeof(buf), "%s", tty);
 253                 else if (strncmp(tty, "tty", 3) == 0)
 254                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 255                 else
 256                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 257                 if (stat(buf, &sb) < 0)
 258                         err(1, "stat(%s)", buf);
 259                 if (!S_ISCHR(sb.st_mode))
 260                         errx(1, "%s: not a character device", buf);
 261                 tdev = sb.st_rdev;
 262                 if (dflag)
 263                         printf("ttydev:0x%x\n", tdev);
 264         }
 265         if (user) {
 266                 uid = strtol(user, &ep, 10);
 267                 if (*user == '\0' || *ep != '\0') { /* was it a number? */
 268                         pw = getpwnam(user);
 269                         if (pw == NULL)
 270                                 errx(1, "user %s does not exist", user);
 271                         uid = pw->pw_uid;
 272                         if (dflag)
 273                                 printf("uid:%d\n", uid);
 274                 }
 275         } else {
 276                 uid = getuid();
 277                 if (uid != 0) {
 278                         pw = getpwuid(uid);
 279                         if (pw)
 280                                 user = pw->pw_name;
 281                         if (dflag)
 282                                 printf("uid:%d\n", uid);
 283                 }
 284         }
 285         size = 0;
 286         mib[0] = CTL_KERN;
 287         mib[1] = KERN_PROC;
 288         mib[2] = KERN_PROC_PROC;
 289         mib[3] = 0;
 290         miblen = 3;
 291
 292         if (user) {
 293                 mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
 294                 mib[3] = uid;
 295                 miblen = 4;
 296         } else if (tty) {
 297                 mib[2] = KERN_PROC_TTY;
 298                 mib[3] = tdev;
 299                 miblen = 4;
 300         }
 301
 302         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 303         do {
 304                 size += size / 10;
 305                 newprocs = realloc(procs, size);
 306                 if (newprocs == 0) {
 307                         if (procs)
 308                                 free(procs);
 309                         errx(1, "could not reallocate memory");
 310                 }
 311                 procs = newprocs;
 312                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 313         } while (st == -1 && errno == ENOMEM);
 314         if (st == -1)
 315                 err(1, "could not sysctl(KERN_PROC)");
 316         if (size % sizeof(struct kinfo_proc) != 0) {
 317                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 318                         size, sizeof(struct kinfo_proc));
 319                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 320                 exit(1);
 321         }
 322         nprocs = size / sizeof(struct kinfo_proc);
 323         if (dflag)
 324                 printf("nprocs %d\n", nprocs);
 325         mypid = getpid();
 326
 327         for (i = 0; i < nprocs; i++) {
 328                 if ((procs[i].ki_stat & SZOMB) == SZOMB && !zflag)
 329                         continue;
 330                 thispid = procs[i].ki_pid;
 331                 strlcpy(thiscmd, procs[i].ki_comm, sizeof(thiscmd));
 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 }