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 1.9 2007/02/01 10:33:26 corecode 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] [-j jail] [-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             jflag = 0, jailid = 0;
 116         int             dflag = 0;
 117         int             mflag = 0;
 118         uid_t           uid = 0;
 119         dev_t           tdev = 0;
 120         pid_t           mypid;
 121         char            thiscmd[MAXCOMLEN + 1];
 122         pid_t           thispid;
 123         uid_t           thisuid;
 124         dev_t           thistdev;
 125         int             sig = SIGTERM;
 126         const char *const *p;
 127         char            *ep;
 128         int             errors = 0;
 129         int             mib[4];
 130         size_t          miblen;
 131         int             st, nprocs;
 132         size_t          size;
 133         int             matched;
 134         int             killed = 0;
 135
 136         prog = av[0];
 137         av++;
 138         ac--;
 139
 140         while (ac > 0) {
 141                 if (strcmp(*av, "-l") == 0) {
 142                         printsig(stdout);
 143                         exit(0);
 144                 }
 145                 if (strcmp(*av, "-help") == 0)
 146                         usage();
 147                 if (**av == '-') {
 148                         ++*av;
 149                         switch (**av) {
 150                         case 'u':
 151                                 ++*av;
 152                                 if (**av == '\0')
 153                                         ++av;
 154                                 --ac;
 155                                 user = *av;
 156                                 break;
 157                         case 't':
 158                                 ++*av;
 159                                 if (**av == '\0')
 160                                         ++av;
 161                                 --ac;
 162                                 tty = *av;
 163                                 break;
 164                         case 'c':
 165                                 ++*av;
 166                                 if (**av == '\0')
 167                                         ++av;
 168                                 --ac;
 169                                 cmd = *av;
 170                                 break;
 171                         case 'j':
 172                         {
 173                                 const char *errstr;
 174                                 ++*av;
 175                                 if (**av == '\0')
 176                                         ++av;
 177                                 --ac;
 178                                 jailid = strtonum(*av, 1, INT_MAX, &errstr);
 179
 180                                 if (errstr)
 181                                         errx(1, "jail id is %s: %s", errstr, *av);
 182                                 jflag++;
 183                                 break;
 184                         }
 185                         case 'q':
 186                                 qflag++;
 187                                 break;
 188                         case 'v':
 189                                 vflag++;
 190                                 break;
 191                         case 's':
 192                                 sflag++;
 193                                 break;
 194                         case 'd':
 195                                 dflag++;
 196                                 break;
 197                         case 'm':
 198                                 mflag++;
 199                                 break;
 200                         default:
 201                                 if (isalpha((unsigned char)**av)) {
 202                                         if (strncasecmp(*av, "sig", 3) == 0)
 203                                                 *av += 3;
 204                                         for (sig = NSIG, p = sys_signame + 1;
 205                                              --sig; ++p)
 206                                                 if (strcasecmp(*p, *av) == 0) {
 207                                                         sig = p - sys_signame;
 208                                                         break;
 209                                                 }
 210                                         if (!sig)
 211                                                 nosig(*av);
 212                                 } else if (isdigit((unsigned char)**av)) {
 213                                         sig = strtol(*av, &ep, 10);
 214                                         if (!*av || *ep)
 215                                                 errx(1, "illegal signal number: %s", *av);
 216                                         if (sig < 0 || sig >= NSIG)
 217                                                 nosig(*av);
 218                                 } else
 219                                         nosig(*av);
 220                         }
 221                         ++av;
 222                         --ac;
 223                 } else {
 224                         break;
 225                 }
 226         }
 227
 228         if (user == NULL && tty == NULL && cmd == NULL && jflag == 0 && ac == 0)
 229                 usage();
 230
 231         if (tty) {
 232                 if (strncmp(tty, "/dev/", 5) == 0)
 233                         snprintf(buf, sizeof(buf), "%s", tty);
 234                 else if (strncmp(tty, "tty", 3) == 0)
 235                         snprintf(buf, sizeof(buf), "/dev/%s", tty);
 236                 else
 237                         snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
 238                 if (stat(buf, &sb) < 0)
 239                         err(1, "stat(%s)", buf);
 240                 if (!S_ISCHR(sb.st_mode))
 241                         errx(1, "%s: not a character device", buf);
 242                 tdev = sb.st_rdev;
 243                 if (dflag)
 244                         printf("ttydev:0x%x\n", tdev);
 245         }
 246         if (user) {
 247                 pw = getpwnam(user);
 248                 if (pw == NULL)
 249                         errx(1, "user %s does not exist", user);
 250                 uid = pw->pw_uid;
 251                 if (dflag)
 252                         printf("uid:%d\n", uid);
 253         } else {
 254                 uid = getuid();
 255                 if (uid != 0) {
 256                         pw = getpwuid(uid);
 257                         if (pw)
 258                                 user = pw->pw_name;
 259                         if (dflag)
 260                                 printf("uid:%d\n", uid);
 261                 }
 262         }
 263         size = 0;
 264         mib[0] = CTL_KERN;
 265         mib[1] = KERN_PROC;
 266         mib[2] = KERN_PROC_ALL;
 267         mib[3] = 0;
 268         miblen = 3;
 269
 270         if (user && mib[2] == KERN_PROC_ALL) {
 271                 mib[2] = KERN_PROC_RUID;
 272                 mib[3] = uid;
 273                 miblen = 4;
 274         }
 275         if (tty && mib[2] == KERN_PROC_ALL) {
 276                 mib[2] = KERN_PROC_TTY;
 277                 mib[3] = tdev;
 278                 miblen = 4;
 279         }
 280
 281         st = sysctl(mib, miblen, NULL, &size, NULL, 0);
 282         do {
 283                 size += size / 10;
 284                 newprocs = realloc(procs, size);
 285                 if (newprocs == 0) {
 286                         if (procs)
 287                                 free(procs);
 288                         errx(1, "could not reallocate memory");
 289                 }
 290                 procs = newprocs;
 291                 st = sysctl(mib, miblen, procs, &size, NULL, 0);
 292         } while (st == -1 && errno == ENOMEM);
 293         if (st == -1)
 294                 err(1, "could not sysctl(KERN_PROC)");
 295         if (size % sizeof(struct kinfo_proc) != 0) {
 296                 fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
 297                         size, sizeof(struct kinfo_proc));
 298                 fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
 299                 exit(1);
 300         }
 301         nprocs = size / sizeof(struct kinfo_proc);
 302         if (dflag)
 303                 printf("nprocs %d\n", nprocs);
 304         mypid = getpid();
 305
 306         for (i = 0; i < nprocs; i++) {
 307                 thispid = procs[i].kp_pid;
 308                 strncpy(thiscmd, procs[i].kp_comm, MAXCOMLEN);
 309                 thiscmd[MAXCOMLEN] = '\0';
 310                 thistdev = procs[i].kp_tdev;
 311                 thisuid = procs[i].kp_ruid;     /* real uid */
 312
 313                 if (thispid == mypid)
 314                         continue;
 315                 matched = 1;
 316                 if ((int)procs[i].kp_pid < 0)
 317                         matched = 0;
 318                 if (user) {
 319                         if (thisuid != uid)
 320                                 matched = 0;
 321                 }
 322                 if (tty) {
 323                         if (thistdev != tdev)
 324                                 matched = 0;
 325                 }
 326                 if (jflag) {
 327                         if (procs[i].kp_jailid != jailid)
 328                                 matched = 0;
 329                 }
 330                 if (cmd) {
 331                         if (mflag) {
 332                                 if (regcomp(&rgx, cmd,
 333                                     REG_EXTENDED|REG_NOSUB) != 0) {
 334                                         mflag = 0;
 335                                         warnx("%s: illegal regexp", cmd);
 336                                 }
 337                         }
 338                         if (mflag) {
 339                                 pmatch.rm_so = 0;
 340                                 pmatch.rm_eo = strlen(thiscmd);
 341                                 if (regexec(&rgx, thiscmd, 0, &pmatch,
 342                                     REG_STARTEND) != 0)
 343                                         matched = 0;
 344                                 regfree(&rgx);
 345                         } else {
 346                                 if (strcmp(thiscmd, cmd) != 0)
 347                                         matched = 0;
 348                         }
 349                 }
 350                 if (matched == 0)
 351                         continue;
 352                 if (ac > 0) {
 353                         matched = 0;
 354                         for (j = 0; j < ac; j++) {
 355                                 if (mflag) {
 356                                         if (regcomp(&rgx, av[j],
 357                                             REG_EXTENDED|REG_NOSUB) != 0) {
 358                                                 mflag = 0;
 359                                                 warnx("%s: illegal regexp", av[j]);
 360                                         }
 361                                 }
 362                                 if (mflag) {
 363                                         pmatch.rm_so = 0;
 364                                         pmatch.rm_eo = strlen(thiscmd);
 365                                         if (regexec(&rgx, thiscmd, 0, &pmatch,
 366                                             REG_STARTEND) == 0)
 367                                                 matched = 1;
 368                                         regfree(&rgx);
 369                                 } else {
 370                                         if (strcmp(thiscmd, av[j]) == 0)
 371                                                 matched = 1;
 372                                 }
 373                                 if (matched)
 374                                         break;
 375                         }
 376                         if (matched == 0)
 377                                 continue;
 378                 }
 379                 if (dflag)
 380                         printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
 381                             thiscmd, thispid, thistdev, thisuid);
 382
 383                 if (vflag || sflag)
 384                         printf("kill -%s %d\n", upper(sys_signame[sig]),
 385                             thispid);
 386
 387                 killed++;
 388                 if (!dflag && !sflag) {
 389                         if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
 390                                 warn("kill -%s %d", upper(sys_signame[sig]),
 391                                     thispid);
 392                                 errors = 1;
 393                         }
 394                 }
 395         }
 396         if (!qflag && killed == 0) {
 397                 fprintf(stderr, "No matching processes %swere found\n",
 398                     getuid() != 0 ? "belonging to you " : "");
 399                 errors = 1;
 400         }
 401         exit(errors);
 402 }