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/cdefs.h>
  31 #include <sys/param.h>
  32 #include <sys/stat.h>
  33 #include <sys/user.h>
  34 #include <sys/sysctl.h>
  35 #include <fcntl.h>
  36 #include <dirent.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <pwd.h>
  41 #include <signal.h>
  42 #include <regex.h>
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <unistd.h>
  47
  48 static char     *prog;
  49
  50 static void __dead2
  51 usage(void)
  52 {
  53
  54         fprintf(stderr, "usage: %s [-l] [-v] [-m] [-sig] [-u user] [-t tty] [-c cmd] [cmd]...\n", prog);
  55         fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
  56         exit(1);
  57 }
  58
  59 static char *
  60 upper(const char *str)
  61 {
  62         static char buf[80];
  63         char *s;
  64
  65         strncpy(buf, str, sizeof(buf));
  66         buf[sizeof(buf) - 1] = '\0';
  67         for (s = buf; *s; s++)
  68                 *s = toupper(*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             vflag = 0;
 113         int             sflag = 0;
 114         int             dflag = 0;
 115         int             mflag = 0;
 116         uid_t           uid = 0;
 117         dev_t           tdev = 0;
 118         char            thiscmd[MAXCOMLEN + 1];
 119         pid_t           thispid;
 120         uid_t           thisuid;
 121         dev_t           thistdev;
 122         int             sig = SIGTERM;
 123         const char *const *p;
 124         char            *ep;
 125         int             errors = 0;
 126         int             mib[4];
 127         size_t          miblen;
 128         int             st, nprocs;
 129         size_t          size;
 130         int             matched;
 131         int             killed = 0;
 132
 133         prog = av[0];
 134         av++;
 135         ac--;
 136
 137         while (ac > 0) {
 138                 if (strcmp(*av, "-l") == 0) {
 139                         printsig(stdout);
 140                         exit(0);
 141                 }
 142                 if (strcmp(*av, "-help") == 0)
 143                         usage();
 144                 if (**av == '-') {
 145                         ++*av;
 146                         switch (**av) {
 147                         case 'u':
 148                                 ++*av;
 149                                 if (**av == '\0')
 150                                         ++av;
 151                                 --ac;
 152                                 user = *av;
 153                                 break;
 154                         case 't':
 155                                 ++*av;
 156                                 if (**av == '\0')
 157                                         ++av;
 158                                 --ac;
 159                                 tty = *av;
 160                                 break;
 161                         case 'c':
 162                                 ++*av;
 163                                 if (**av == '\0')
 164                                         ++av;
 165                                 --ac;
 166                                 cmd = *av;
 167                                 break;
 168                         case 'v':
 169                                 vflag++;
 170                                 break;
 171                         case 's':
 172                                 sflag++;
 173                                 break;
 174                         case 'd':
 175                                 dflag++;
 176                                 break;
 177                         case 'm':
 178                                 mflag++;
 179                                 break;
 180                         default:
 181                                 if (isalpha(**av)) {
 182                                         if (strncasecmp(*av, "sig", 3) == 0)
 183                                                 *av += 3;
 184                                         for (sig = NSIG, p = sys_signame + 1;
 185                                              --sig; ++p)
 186                                                 if (strcasecmp(*p, *av) == 0) {
 187                                                         sig = p - sys_signame;
 188                                                         break;
 189                                                 }
 190                                         if (!sig)
 191                                                 nosig(*av);
 192                                 } else if (isdigit(**av)) {
 193                                         sig = strtol(*av, &ep, 10);
 194                                         if (!*av || *ep)
 195                                                 errx(1, "illegal signal number: %s", *av);
 196                                         if (sig < 0 || sig > NSIG)
 197                                                 nosig(*av);
 198                                 } else
 199                                         nosig(*av);
 200                         }
 201                         ++av;
 202                         --ac;
 203                 } else {
 204                         break;
 205                 }
 206         }
 207
 208         if (user == NULL && tty == NULL && cmd == NULL && ac == 0)
 209                 usage();
 210
 211         if (tty) {
 212                 if (strncmp(tty, "/dev/", 5) == 0)
 213                         snprintf(buf, sizeof(buf), "%s", tty);
 214                 else if (strncmp(tty, "tty", 3) == 0)
 215                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 216                 else
 217                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 218                 if (stat(buf, &sb) < 0)
 219                         err(1, "stat(%s)", buf);
 220                 if (!S_ISCHR(sb.st_mode))
 221                         errx(1, "%s: not a character device", buf);
 222                 tdev = sb.st_rdev;
 223                 if (dflag)
 224                         printf("ttydev:0x%x\n", tdev);
 225         }
 226         if (user) {
 227                 pw = getpwnam(user);
 228                 if (pw == NULL)
 229                         errx(1, "user %s does not exist", user);
 230                 uid = pw->pw_uid;
 231                 if (dflag)
 232                         printf("uid:%d\n", uid);
 233         } else {
 234                 uid = getuid();
 235                 if (uid != 0) {
 236                         pw = getpwuid(uid);
 237                         if (pw)
 238                                 user = pw->pw_name;
 239                         if (dflag)
 240                                 printf("uid:%d\n", uid);
 241                 }
 242         }
 243         size = 0;
 244         mib[0] = CTL_KERN;
 245         mib[1] = KERN_PROC;
 246         mib[2] = KERN_PROC_ALL;
 247         mib[3] = 0;
 248         miblen = 3;
 249
 250         if (user && mib[2] == KERN_PROC_ALL) {
 251                 mib[2] = KERN_PROC_RUID;
 252                 mib[3] = uid;
 253                 miblen = 4;
 254         }
 255         if (tty && mib[2] == KERN_PROC_ALL) {
 256                 mib[2] = KERN_PROC_TTY;
 257                 mib[3] = tdev;
 258                 miblen = 4;
 259         }
 260
 261         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 262         do {
 263                 size += size / 10;
 264                 newprocs = realloc(procs, size);
 265                 if (newprocs == 0) {
 266                         if (procs)
 267                                 free(procs);
 268                         errx(1, "could not reallocate memory");
 269                 }
 270                 procs = newprocs;
 271                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 272         } while (st == -1 && errno == ENOMEM);
 273         if (st == -1)
 274                 err(1, "could not sysctl(KERN_PROC)");
 275         if (size % sizeof(struct kinfo_proc) != 0) {
 276                 fprintf(stderr, "proc size mismatch (%d total, %d chunks)\n",
 277                         size, sizeof(struct kinfo_proc));
 278                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 279                 exit(1);
 280         }
 281         nprocs = size / sizeof(struct kinfo_proc);
 282         if (dflag)
 283                 printf("nprocs %d\n", nprocs);
 284
 285         for (i = 0; i < nprocs; i++) {
 286                 thispid = procs[i].kp_proc.p_pid;
 287                 strncpy(thiscmd, procs[i].kp_proc.p_comm, MAXCOMLEN);
 288                 thiscmd[MAXCOMLEN] = '\0';
 289                 thistdev = procs[i].kp_eproc.e_tdev;
 290                 thisuid = procs[i].kp_eproc.e_pcred.p_ruid;     /* real uid */
 291
 292                 matched = 1;
 293                 if (user) {
 294                         if (thisuid != uid)
 295                                 matched = 0;
 296                 }
 297                 if (tty) {
 298                         if (thistdev != tdev)
 299                                 matched = 0;
 300                 }
 301                 if (cmd) {
 302                         if (mflag) {
 303                                 if (regcomp(&rgx, cmd,
 304                                     REG_EXTENDED|REG_NOSUB) != 0) {
 305                                         mflag = 0;
 306                                         warnx("%s: illegal regexp", cmd);
 307                                 }
 308                         }
 309                         if (mflag) {
 310                                 pmatch.rm_so = 0;
 311                                 pmatch.rm_eo = strlen(thiscmd);
 312                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 313                                     REG_STARTEND) != 0)
 314                                         matched = 0;
 315                                 regfree(&rgx);
 316                         } else {
 317                                 if (strcmp(thiscmd, cmd) != 0)
 318                                         matched = 0;
 319                         }
 320                 }
 321                 if (matched == 0)
 322                         continue;
 323                 matched = 0;
 324                 for (j = 0; j < ac; j++) {
 325                         if (mflag) {
 326                                 if (regcomp(&rgx, av[j],
 327                                     REG_EXTENDED|REG_NOSUB) != 0) {
 328                                         mflag = 0;
 329                                         warnx("%s: illegal regexp", av[j]);
 330                                 }
 331                         }
 332                         if (mflag) {
 333                                 pmatch.rm_so = 0;
 334                                 pmatch.rm_eo = strlen(thiscmd);
 335                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 336                                     REG_STARTEND) == 0)
 337                                         matched = 1;
 338                                 regfree(&rgx);
 339                         } else {
 340                                 if (strcmp(thiscmd, av[j]) == 0)
 341                                         matched = 1;
 342                         }
 343                         if (matched)
 344                                 break;
 345                 }
 346                 if (matched == 0)
 347                         continue;
 348                 if (dflag)
 349                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 350                             thiscmd, thispid, thistdev, thisuid);
 351
 352                 if (vflag || sflag)
 353                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 354                             thispid);
 355
 356                 killed++;
 357                 if (!dflag && !sflag) {
 358                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 359                                 warn("kill -%s %d", upper(sys_signame[sig]),
 360                                     thispid);
 361                                 errors = 1;
 362                         }
 363                 }
 364         }
 365         if (killed == 0) {
 366                 fprintf(stderr, "No matching processes %swere found\n",
 367                     getuid() != 0 ? "belonging to you " : "");
 368                 errors = 1;
 369         }
 370         exit(errors);
 371 }