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  * $FreeBSD: src/usr.bin/killall/killall.c,v 1.5.2.4 2001/05/19 19:22:49 phk Exp $
  28  */
  29
  30 #include <sys/user.h>
  31 #include <sys/param.h>
  32 #include <sys/stat.h>
  33 #include <sys/sysctl.h>
  34 #include <fcntl.h>
  35 #include <dirent.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <pwd.h>
  40 #include <signal.h>
  41 #include <regex.h>
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <unistd.h>
  46
  47 static char     *prog;
  48
  49 static void __dead2
  50 usage(void)
  51 {
  52
  53         fprintf(stderr, "usage: %s [-l] [-v] [-m] [-sig] "
  54                         "[-u user] [-j jail] [-t tty] "
  55                         "[-c cmd] [cmd]...\n", prog);
  56         fprintf(stderr, "At least one option or argument to specify "
  57                         "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             qflag = 0;
 114         int             vflag = 0;
 115         int             sflag = 0;
 116         int             jflag = 0, jailid = 0;
 117         int             dflag = 0;
 118         int             mflag = 0;
 119         uid_t           uid = 0;
 120         dev_t           tdev = 0;
 121         pid_t           mypid;
 122         char            thiscmd[MAXCOMLEN + 1];
 123         pid_t           thispid;
 124         uid_t           thisuid;
 125         dev_t           thistdev;
 126         int             sig = SIGTERM;
 127         const char *const *p;
 128         char            *ep;
 129         int             errors = 0;
 130         int             mib[4];
 131         size_t          miblen;
 132         int             st, nprocs;
 133         size_t          size;
 134         int             matched;
 135         int             killed = 0;
 136
 137         prog = av[0];
 138         av++;
 139         ac--;
 140
 141         while (ac > 0) {
 142                 if (strcmp(*av, "-l") == 0) {
 143                         printsig(stdout);
 144                         exit(0);
 145                 }
 146                 if (strcmp(*av, "-help") == 0)
 147                         usage();
 148                 if (**av == '-') {
 149                         ++*av;
 150                         switch (**av) {
 151                         case 'u':
 152                                 ++*av;
 153                                 if (**av == '\0')
 154                                         ++av;
 155                                 --ac;
 156                                 user = *av;
 157                                 break;
 158                         case 't':
 159                                 ++*av;
 160                                 if (**av == '\0')
 161                                         ++av;
 162                                 --ac;
 163                                 tty = *av;
 164                                 break;
 165                         case 'c':
 166                                 ++*av;
 167                                 if (**av == '\0')
 168                                         ++av;
 169                                 --ac;
 170                                 cmd = *av;
 171                                 break;
 172                         case 'j':
 173                         {
 174                                 const char *errstr;
 175                                 ++*av;
 176                                 if (**av == '\0')
 177                                         ++av;
 178                                 --ac;
 179                                 jailid = strtonum(*av, 1, INT_MAX, &errstr);
 180
 181                                 if (errstr)
 182                                         errx(1, "jail id is %s: %s", errstr, *av);
 183                                 jflag++;
 184                                 break;
 185                         }
 186                         case 'q':
 187                                 qflag++;
 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 'm':
 199                                 mflag++;
 200                                 break;
 201                         default:
 202                                 if (isalpha((unsigned char)**av)) {
 203                                         if (strncasecmp(*av, "sig", 3) == 0)
 204                                                 *av += 3;
 205                                         for (sig = NSIG, p = sys_signame + 1;
 206                                              --sig; ++p)
 207                                                 if (strcasecmp(*p, *av) == 0) {
 208                                                         sig = p - sys_signame;
 209                                                         break;
 210                                                 }
 211                                         if (!sig)
 212                                                 nosig(*av);
 213                                 } else if (isdigit((unsigned char)**av)) {
 214                                         sig = strtol(*av, &ep, 10);
 215                                         if (!*av || *ep)
 216                                                 errx(1, "illegal signal number: %s", *av);
 217                                         if (sig < 0 || sig >= NSIG)
 218                                                 nosig(*av);
 219                                 } else
 220                                         nosig(*av);
 221                         }
 222                         ++av;
 223                         --ac;
 224                 } else {
 225                         break;
 226                 }
 227         }
 228
 229         if (user == NULL && tty == NULL && cmd == NULL && jflag == 0 && ac == 0)
 230                 usage();
 231
 232         if (tty) {
 233                 if (strncmp(tty, "/dev/", 5) == 0)
 234                         snprintf(buf, sizeof(buf), "%s", tty);
 235                 else if (strncmp(tty, "tty", 3) == 0)
 236                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 237                 else if (isdigit(tty[0]))
 238                         snprintf(buf, sizeof(buf), "/dev/pts/%s", tty);
 239                 else
 240                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 241                 if (stat(buf, &sb) < 0)
 242                         err(1, "stat(%s)", buf);
 243                 if (!S_ISCHR(sb.st_mode))
 244                         errx(1, "%s: not a character device", buf);
 245                 tdev = sb.st_rdev;
 246                 if (dflag)
 247                         printf("ttydev:0x%x\n", tdev);
 248         }
 249         if (user) {
 250                 pw = getpwnam(user);
 251                 if (pw == NULL)
 252                         errx(1, "user %s does not exist", user);
 253                 uid = pw->pw_uid;
 254                 if (dflag)
 255                         printf("uid:%d\n", uid);
 256         } else {
 257                 uid = getuid();
 258                 if (uid != 0) {
 259                         pw = getpwuid(uid);
 260                         if (pw)
 261                                 user = pw->pw_name;
 262                         if (dflag)
 263                                 printf("uid:%d\n", uid);
 264                 }
 265         }
 266         size = 0;
 267         mib[0] = CTL_KERN;
 268         mib[1] = KERN_PROC;
 269         mib[2] = KERN_PROC_ALL;
 270         mib[3] = 0;
 271         miblen = 3;
 272
 273         if (user && mib[2] == KERN_PROC_ALL) {
 274                 mib[2] = KERN_PROC_RUID;
 275                 mib[3] = uid;
 276                 miblen = 4;
 277         }
 278         if (tty && mib[2] == KERN_PROC_ALL) {
 279                 mib[2] = KERN_PROC_TTY;
 280                 mib[3] = tdev;
 281                 miblen = 4;
 282         }
 283
 284         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 285         do {
 286                 size += size / 10;
 287                 newprocs = realloc(procs, size);
 288                 if (newprocs == NULL) {
 289                         if (procs)
 290                                 free(procs);
 291                         errx(1, "could not reallocate memory");
 292                 }
 293                 procs = newprocs;
 294                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 295         } while (st == -1 && errno == ENOMEM);
 296         if (st == -1)
 297                 err(1, "could not sysctl(KERN_PROC)");
 298         if (size % sizeof(struct kinfo_proc) != 0) {
 299                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 300                         size, sizeof(struct kinfo_proc));
 301                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 302                 exit(1);
 303         }
 304         nprocs = size / sizeof(struct kinfo_proc);
 305         if (dflag)
 306                 printf("nprocs %d\n", nprocs);
 307         mypid = getpid();
 308
 309         for (i = 0; i < nprocs; i++) {
 310                 thispid = procs[i].kp_pid;
 311                 strncpy(thiscmd, procs[i].kp_comm, MAXCOMLEN);
 312                 thiscmd[MAXCOMLEN] = '\0';
 313                 thistdev = procs[i].kp_tdev;
 314                 thisuid = procs[i].kp_ruid;     /* real uid */
 315
 316                 if (thispid == mypid)
 317                         continue;
 318                 matched = 1;
 319                 if ((int)procs[i].kp_pid < 0)
 320                         matched = 0;
 321                 if (user) {
 322                         if (thisuid != uid)
 323                                 matched = 0;
 324                 }
 325                 if (tty) {
 326                         if (thistdev != tdev)
 327                                 matched = 0;
 328                 }
 329                 if (jflag) {
 330                         if (procs[i].kp_jailid != jailid)
 331                                 matched = 0;
 332                 }
 333                 if (cmd) {
 334                         if (mflag) {
 335                                 if (regcomp(&rgx, cmd,
 336                                     REG_EXTENDED|REG_NOSUB) != 0) {
 337                                         mflag = 0;
 338                                         warnx("%s: illegal regexp", cmd);
 339                                 }
 340                         }
 341                         if (mflag) {
 342                                 pmatch.rm_so = 0;
 343                                 pmatch.rm_eo = strlen(thiscmd);
 344                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 345                                     REG_STARTEND) != 0)
 346                                         matched = 0;
 347                                 regfree(&rgx);
 348                         } else {
 349                                 if (strcmp(thiscmd, cmd) != 0)
 350                                         matched = 0;
 351                         }
 352                 }
 353                 if (matched == 0)
 354                         continue;
 355                 if (ac > 0) {
 356                         matched = 0;
 357                         for (j = 0; j < ac; j++) {
 358                                 if (mflag) {
 359                                         if (regcomp(&rgx, av[j],
 360                                             REG_EXTENDED|REG_NOSUB) != 0) {
 361                                                 mflag = 0;
 362                                                 warnx("%s: illegal regexp", av[j]);
 363                                         }
 364                                 }
 365                                 if (mflag) {
 366                                         pmatch.rm_so = 0;
 367                                         pmatch.rm_eo = strlen(thiscmd);
 368                                         if (regexec(&rgx, thiscmd, 0, &pmatch,
 369                                             REG_STARTEND) == 0)
 370                                                 matched = 1;
 371                                         regfree(&rgx);
 372                                 } else {
 373                                         if (strcmp(thiscmd, av[j]) == 0)
 374                                                 matched = 1;
 375                                 }
 376                                 if (matched)
 377                                         break;
 378                         }
 379                         if (matched == 0)
 380                                 continue;
 381                 }
 382                 if (dflag)
 383                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 384                             thiscmd, thispid, thistdev, thisuid);
 385
 386                 if (vflag || sflag)
 387                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 388                             thispid);
 389
 390                 killed++;
 391                 if (!dflag && !sflag) {
 392                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 393                                 warn("kill -%s %d", upper(sys_signame[sig]),
 394                                     thispid);
 395                                 errors = 1;
 396                         }
 397                 }
 398         }
 399         if (!qflag && killed == 0) {
 400                 fprintf(stderr, "No matching processes %swere found\n",
 401                     getuid() != 0 ? "belonging to you " : "");
 402                 errors = 1;
 403         }
 404         exit(errors);
 405 }