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  * $DragonFly: src/usr.bin/killall/killall.c,v 1.6 2004/07/16 00:52:22 hmp Exp $
  29  */
  30
  31 #include <sys/cdefs.h>
  32 #include <sys/param.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
  49 static char     *prog;
  50
  51 static void __dead2
  52 usage(void)
  53 {
  54
  55         fprintf(stderr, "usage: %s [-l] [-v] [-m] [-sig] [-u user] [-t tty] [-c cmd] [cmd]...\n", prog);
  56         fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
  57         exit(1);
  58 }
  59
  60 static char *
  61 upper(const char *str)
  62 {
  63         static char buf[80];
  64         char *s;
  65
  66         strlcpy(buf, str, sizeof(buf));
  67         for (s = buf; *s; s++)
  68                 *s = toupper((unsigned char)*s);
  69         return buf;
  70 }
  71
  72
  73 static void
  74 printsig(FILE *fp)
  75 {
  76         const char      *const * p;
  77         int             cnt;
  78         int             offset = 0;
  79
  80         for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
  81                 offset += fprintf(fp, "%s ", upper(*p));
  82                 if (offset >= 75 && cnt > 1) {
  83                         offset = 0;
  84                         fprintf(fp, "\n");
  85                 }
  86         }
  87         fprintf(fp, "\n");
  88 }
  89
  90 static void
  91 nosig(char *name)
  92 {
  93
  94         warnx("unknown signal %s; valid signals:", name);
  95         printsig(stderr);
  96         exit(1);
  97 }
  98
  99 int
 100 main(int ac, char **av)
 101 {
 102         struct kinfo_proc *procs = NULL, *newprocs;
 103         struct stat     sb;
 104         struct passwd   *pw;
 105         regex_t         rgx;
 106         regmatch_t      pmatch;
 107         int             i, j;
 108         char            buf[256];
 109         char            *user = NULL;
 110         char            *tty = NULL;
 111         char            *cmd = NULL;
 112         int             qflag = 0;
 113         int             vflag = 0;
 114         int             sflag = 0;
 115         int             dflag = 0;
 116         int             mflag = 0;
 117         uid_t           uid = 0;
 118         dev_t           tdev = 0;
 119         pid_t           mypid;
 120         char            thiscmd[MAXCOMLEN + 1];
 121         pid_t           thispid;
 122         uid_t           thisuid;
 123         dev_t           thistdev;
 124         int             sig = SIGTERM;
 125         const char *const *p;
 126         char            *ep;
 127         int             errors = 0;
 128         int             mib[4];
 129         size_t          miblen;
 130         int             st, nprocs;
 131         size_t          size;
 132         int             matched;
 133         int             killed = 0;
 134
 135         prog = av[0];
 136         av++;
 137         ac--;
 138
 139         while (ac > 0) {
 140                 if (strcmp(*av, "-l") == 0) {
 141                         printsig(stdout);
 142                         exit(0);
 143                 }
 144                 if (strcmp(*av, "-help") == 0)
 145                         usage();
 146                 if (**av == '-') {
 147                         ++*av;
 148                         switch (**av) {
 149                         case 'u':
 150                                 ++*av;
 151                                 if (**av == '\0')
 152                                         ++av;
 153                                 --ac;
 154                                 user = *av;
 155                                 break;
 156                         case 't':
 157                                 ++*av;
 158                                 if (**av == '\0')
 159                                         ++av;
 160                                 --ac;
 161                                 tty = *av;
 162                                 break;
 163                         case 'c':
 164                                 ++*av;
 165                                 if (**av == '\0')
 166                                         ++av;
 167                                 --ac;
 168                                 cmd = *av;
 169                                 break;
 170                         case 'q':
 171                                 qflag++;
 172                                 break;
 173                         case 'v':
 174                                 vflag++;
 175                                 break;
 176                         case 's':
 177                                 sflag++;
 178                                 break;
 179                         case 'd':
 180                                 dflag++;
 181                                 break;
 182                         case 'm':
 183                                 mflag++;
 184                                 break;
 185                         default:
 186                                 if (isalpha((unsigned char)**av)) {
 187                                         if (strncasecmp(*av, "sig", 3) == 0)
 188                                                 *av += 3;
 189                                         for (sig = NSIG, p = sys_signame + 1;
 190                                              --sig; ++p)
 191                                                 if (strcasecmp(*p, *av) == 0) {
 192                                                         sig = p - sys_signame;
 193                                                         break;
 194                                                 }
 195                                         if (!sig)
 196                                                 nosig(*av);
 197                                 } else if (isdigit((unsigned char)**av)) {
 198                                         sig = strtol(*av, &ep, 10);
 199                                         if (!*av || *ep)
 200                                                 errx(1, "illegal signal number: %s", *av);
 201                                         if (sig < 0 || sig > NSIG)
 202                                                 nosig(*av);
 203                                 } else
 204                                         nosig(*av);
 205                         }
 206                         ++av;
 207                         --ac;
 208                 } else {
 209                         break;
 210                 }
 211         }
 212
 213         if (user == NULL && tty == NULL && cmd == NULL && ac == 0)
 214                 usage();
 215
 216         if (tty) {
 217                 if (strncmp(tty, "/dev/", 5) == 0)
 218                         snprintf(buf, sizeof(buf), "%s", tty);
 219                 else if (strncmp(tty, "tty", 3) == 0)
 220                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 221                 else
 222                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 223                 if (stat(buf, &sb) < 0)
 224                         err(1, "stat(%s)", buf);
 225                 if (!S_ISCHR(sb.st_mode))
 226                         errx(1, "%s: not a character device", buf);
 227                 tdev = sb.st_rdev;
 228                 if (dflag)
 229                         printf("ttydev:0x%x\n", tdev);
 230         }
 231         if (user) {
 232                 pw = getpwnam(user);
 233                 if (pw == NULL)
 234                         errx(1, "user %s does not exist", user);
 235                 uid = pw->pw_uid;
 236                 if (dflag)
 237                         printf("uid:%d\n", uid);
 238         } else {
 239                 uid = getuid();
 240                 if (uid != 0) {
 241                         pw = getpwuid(uid);
 242                         if (pw)
 243                                 user = pw->pw_name;
 244                         if (dflag)
 245                                 printf("uid:%d\n", uid);
 246                 }
 247         }
 248         size = 0;
 249         mib[0] = CTL_KERN;
 250         mib[1] = KERN_PROC;
 251         mib[2] = KERN_PROC_ALL;
 252         mib[3] = 0;
 253         miblen = 3;
 254
 255         if (user && mib[2] == KERN_PROC_ALL) {
 256                 mib[2] = KERN_PROC_RUID;
 257                 mib[3] = uid;
 258                 miblen = 4;
 259         }
 260         if (tty && mib[2] == KERN_PROC_ALL) {
 261                 mib[2] = KERN_PROC_TTY;
 262                 mib[3] = tdev;
 263                 miblen = 4;
 264         }
 265
 266         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 267         do {
 268                 size += size / 10;
 269                 newprocs = realloc(procs, size);
 270                 if (newprocs == 0) {
 271                         if (procs)
 272                                 free(procs);
 273                         errx(1, "could not reallocate memory");
 274                 }
 275                 procs = newprocs;
 276                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 277         } while (st == -1 && errno == ENOMEM);
 278         if (st == -1)
 279                 err(1, "could not sysctl(KERN_PROC)");
 280         if (size % sizeof(struct kinfo_proc) != 0) {
 281                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 282                         size, sizeof(struct kinfo_proc));
 283                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 284                 exit(1);
 285         }
 286         nprocs = size / sizeof(struct kinfo_proc);
 287         if (dflag)
 288                 printf("nprocs %d\n", nprocs);
 289         mypid = getpid();
 290
 291         for (i = 0; i < nprocs; i++) {
 292                 thispid = procs[i].kp_proc.p_pid;
 293                 strncpy(thiscmd, procs[i].kp_thread.td_comm, MAXCOMLEN);
 294                 thiscmd[MAXCOMLEN] = '\0';
 295                 thistdev = procs[i].kp_eproc.e_tdev;
 296                 thisuid = procs[i].kp_eproc.e_ucred.cr_ruid;    /* real uid */
 297
 298                 if (thispid == mypid)
 299                         continue;
 300                 matched = 1;
 301                 if ((int)procs[i].kp_proc.p_pid < 0)
 302                         matched = 0;
 303                 if (user) {
 304                         if (thisuid != uid)
 305                                 matched = 0;
 306                 }
 307                 if (tty) {
 308                         if (thistdev != tdev)
 309                                 matched = 0;
 310                 }
 311                 if (cmd) {
 312                         if (mflag) {
 313                                 if (regcomp(&rgx, cmd,
 314                                     REG_EXTENDED|REG_NOSUB) != 0) {
 315                                         mflag = 0;
 316                                         warnx("%s: illegal regexp", cmd);
 317                                 }
 318                         }
 319                         if (mflag) {
 320                                 pmatch.rm_so = 0;
 321                                 pmatch.rm_eo = strlen(thiscmd);
 322                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 323                                     REG_STARTEND) != 0)
 324                                         matched = 0;
 325                                 regfree(&rgx);
 326                         } else {
 327                                 if (strcmp(thiscmd, cmd) != 0)
 328                                         matched = 0;
 329                         }
 330                 }
 331                 if (matched == 0)
 332                         continue;
 333                 matched = 0;
 334                 for (j = 0; j < ac; j++) {
 335                         if (mflag) {
 336                                 if (regcomp(&rgx, av[j],
 337                                     REG_EXTENDED|REG_NOSUB) != 0) {
 338                                         mflag = 0;
 339                                         warnx("%s: illegal regexp", av[j]);
 340                                 }
 341                         }
 342                         if (mflag) {
 343                                 pmatch.rm_so = 0;
 344                                 pmatch.rm_eo = strlen(thiscmd);
 345                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 346                                     REG_STARTEND) == 0)
 347                                         matched = 1;
 348                                 regfree(&rgx);
 349                         } else {
 350                                 if (strcmp(thiscmd, av[j]) == 0)
 351                                         matched = 1;
 352                         }
 353                         if (matched)
 354                                 break;
 355                 }
 356                 if (matched == 0)
 357                         continue;
 358                 if (dflag)
 359                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 360                             thiscmd, thispid, thistdev, thisuid);
 361
 362                 if (vflag || sflag)
 363                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 364                             thispid);
 365
 366                 killed++;
 367                 if (!dflag && !sflag) {
 368                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 369                                 warn("kill -%s %d", upper(sys_signame[sig]),
 370                                     thispid);
 371                                 errors = 1;
 372                         }
 373                 }
 374         }
 375         if (!qflag && killed == 0) {
 376                 fprintf(stderr, "No matching processes %swere found\n",
 377                     getuid() != 0 ? "belonging to you " : "");
 378                 errors = 1;
 379         }
 380         exit(errors);
 381 }