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  * $FreeBSD$
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #include <sys/param.h>
  32 #include <sys/lock.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         strncpy(buf, str, sizeof(buf));
  67         buf[sizeof(buf) - 1] = '\0';
  68         for (s = buf; *s; s++)
  69                 *s = toupper(*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             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         char            thiscmd[MAXCOMLEN + 1];
 120         pid_t           thispid;
 121         uid_t           thisuid;
 122         dev_t           thistdev;
 123         int             sig = SIGTERM;
 124         const char *const *p;
 125         char            *ep;
 126         int             errors = 0;
 127         int             mib[4];
 128         size_t          miblen;
 129         int             st, nprocs;
 130         size_t          size;
 131         int             matched;
 132         int             killed = 0;
 133
 134         prog = av[0];
 135         av++;
 136         ac--;
 137
 138         while (ac > 0) {
 139                 if (strcmp(*av, "-l") == 0) {
 140                         printsig(stdout);
 141                         exit(0);
 142                 }
 143                 if (strcmp(*av, "-help") == 0)
 144                         usage();
 145                 if (**av == '-') {
 146                         ++*av;
 147                         switch (**av) {
 148                         case 'u':
 149                                 ++*av;
 150                                 if (**av == '\0')
 151                                         ++av;
 152                                 --ac;
 153                                 user = *av;
 154                                 break;
 155                         case 't':
 156                                 ++*av;
 157                                 if (**av == '\0')
 158                                         ++av;
 159                                 --ac;
 160                                 tty = *av;
 161                                 break;
 162                         case 'c':
 163                                 ++*av;
 164                                 if (**av == '\0')
 165                                         ++av;
 166                                 --ac;
 167                                 cmd = *av;
 168                                 break;
 169                         case 'v':
 170                                 vflag++;
 171                                 break;
 172                         case 's':
 173                                 sflag++;
 174                                 break;
 175                         case 'd':
 176                                 dflag++;
 177                                 break;
 178                         case 'm':
 179                                 mflag++;
 180                                 break;
 181                         default:
 182                                 if (isalpha(**av)) {
 183                                         if (strncasecmp(*av, "sig", 3) == 0)
 184                                                 *av += 3;
 185                                         for (sig = NSIG, p = sys_signame + 1;
 186                                              --sig; ++p)
 187                                                 if (strcasecmp(*p, *av) == 0) {
 188                                                         sig = p - sys_signame;
 189                                                         break;
 190                                                 }
 191                                         if (!sig)
 192                                                 nosig(*av);
 193                                 } else if (isdigit(**av)) {
 194                                         sig = strtol(*av, &ep, 10);
 195                                         if (!*av || *ep)
 196                                                 errx(1, "illegal signal number: %s", *av);
 197                                         if (sig < 0 || sig > NSIG)
 198                                                 nosig(*av);
 199                                 } else
 200                                         nosig(*av);
 201                         }
 202                         ++av;
 203                         --ac;
 204                 } else {
 205                         break;
 206                 }
 207         }
 208
 209         if (user == NULL && tty == NULL && cmd == NULL && ac == 0)
 210                 usage();
 211
 212         if (tty) {
 213                 if (strncmp(tty, "/dev/", 5) == 0)
 214                         snprintf(buf, sizeof(buf), "%s", tty);
 215                 else if (strncmp(tty, "tty", 3) == 0)
 216                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 217                 else
 218                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 219                 if (stat(buf, &sb) < 0)
 220                         err(1, "stat(%s)", buf);
 221                 if (!S_ISCHR(sb.st_mode))
 222                         errx(1, "%s: not a character device", buf);
 223                 tdev = sb.st_rdev;
 224                 if (dflag)
 225                         printf("ttydev:0x%x\n", tdev);
 226         }
 227         if (user) {
 228                 uid = strtol(user, &ep, 10);
 229                 if ((ep - user) < strlen(user)) {
 230                         pw = getpwnam(user);
 231                         if (pw == NULL)
 232                                 errx(1, "user %s does not exist", user);
 233                         uid = pw->pw_uid;
 234                         if (dflag)
 235                                 printf("uid:%d\n", uid);
 236                 }
 237         } else {
 238                 uid = getuid();
 239                 if (uid != 0) {
 240                         pw = getpwuid(uid);
 241                         if (pw)
 242                                 user = pw->pw_name;
 243                         if (dflag)
 244                                 printf("uid:%d\n", uid);
 245                 }
 246         }
 247         size = 0;
 248         mib[0] = CTL_KERN;
 249         mib[1] = KERN_PROC;
 250         mib[2] = KERN_PROC_ALL;
 251         mib[3] = 0;
 252         miblen = 3;
 253
 254         if (user && mib[2] == KERN_PROC_ALL) {
 255                 mib[2] = KERN_PROC_RUID;
 256                 mib[3] = uid;
 257                 miblen = 4;
 258         }
 259         if (tty && mib[2] == KERN_PROC_ALL) {
 260                 mib[2] = KERN_PROC_TTY;
 261                 mib[3] = tdev;
 262                 miblen = 4;
 263         }
 264
 265         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 266         do {
 267                 size += size / 10;
 268                 newprocs = realloc(procs, size);
 269                 if (newprocs == 0) {
 270                         if (procs)
 271                                 free(procs);
 272                         errx(1, "could not reallocate memory");
 273                 }
 274                 procs = newprocs;
 275                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 276         } while (st == -1 && errno == ENOMEM);
 277         if (st == -1)
 278                 err(1, "could not sysctl(KERN_PROC)");
 279         if (size % sizeof(struct kinfo_proc) != 0) {
 280                 fprintf(stderr, "proc size mismatch (%d total, %d chunks)\n",
 281                         size, sizeof(struct kinfo_proc));
 282                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 283                 exit(1);
 284         }
 285         nprocs = size / sizeof(struct kinfo_proc);
 286         if (dflag)
 287                 printf("nprocs %d\n", nprocs);
 288
 289         for (i = 0; i < nprocs; i++) {
 290                 thispid = procs[i].ki_pid;
 291                 strncpy(thiscmd, procs[i].ki_comm, MAXCOMLEN);
 292                 thiscmd[MAXCOMLEN] = '\0';
 293                 thistdev = procs[i].ki_tdev;
 294                 thisuid = procs[i].ki_ruid;     /* real uid */
 295
 296                 matched = 1;
 297                 if (user) {
 298                         if (thisuid != uid)
 299                                 matched = 0;
 300                 }
 301                 if (tty) {
 302                         if (thistdev != tdev)
 303                                 matched = 0;
 304                 }
 305                 if (cmd) {
 306                         if (mflag) {
 307                                 if (regcomp(&rgx, cmd,
 308                                     REG_EXTENDED|REG_NOSUB) != 0) {
 309                                         mflag = 0;
 310                                         warnx("%s: illegal regexp", cmd);
 311                                 }
 312                         }
 313                         if (mflag) {
 314                                 pmatch.rm_so = 0;
 315                                 pmatch.rm_eo = strlen(thiscmd);
 316                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 317                                     REG_STARTEND) != 0)
 318                                         matched = 0;
 319                                 regfree(&rgx);
 320                         } else {
 321                                 if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
 322                                         matched = 0;
 323                         }
 324                 }
 325                 if (matched == 0)
 326                         continue;
 327                 if (ac > 0)
 328                         matched = 0;
 329                 for (j = 0; j < ac; j++) {
 330                         if (mflag) {
 331                                 if (regcomp(&rgx, av[j],
 332                                     REG_EXTENDED|REG_NOSUB) != 0) {
 333                                         mflag = 0;
 334                                         warnx("%s: illegal regexp", av[j]);
 335                                 }
 336                         }
 337                         if (mflag) {
 338                                 pmatch.rm_so = 0;
 339                                 pmatch.rm_eo = strlen(thiscmd);
 340                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 341                                     REG_STARTEND) == 0)
 342                                         matched = 1;
 343                                 regfree(&rgx);
 344                         } else {
 345                                 if (strcmp(thiscmd, av[j]) == 0)
 346                                         matched = 1;
 347                         }
 348                         if (matched)
 349                                 break;
 350                 }
 351                 if (matched == 0)
 352                         continue;
 353                 if (dflag)
 354                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 355                             thiscmd, thispid, thistdev, thisuid);
 356
 357                 if (vflag || sflag)
 358                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 359                             thispid);
 360
 361                 killed++;
 362                 if (!dflag && !sflag) {
 363                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 364                                 warn("kill -%s %d", upper(sys_signame[sig]),
 365                                     thispid);
 366                                 errors = 1;
 367                         }
 368                 }
 369         }
 370         if (killed == 0) {
 371                 fprintf(stderr, "No matching processes %swere found\n",
 372                     getuid() != 0 ? "belonging to you " : "");
 373                 errors = 1;
 374         }
 375         exit(errors);
 376 }