bin/pkill/pkill.c

   1 /*      $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Andrew Doran.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/proc.h>
  40 #include <sys/queue.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #include <sys/user.h>
  44
  45 #include <assert.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <limits.h>
  49 #include <paths.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <signal.h>
  53 #include <regex.h>
  54 #include <ctype.h>
  55 #include <fcntl.h>
  56 #include <kvm.h>
  57 #include <err.h>
  58 #include <pwd.h>
  59 #include <grp.h>
  60 #include <errno.h>
  61 #include <locale.h>
  62 #include <jail.h>
  63
  64 #define STATUS_MATCH    0
  65 #define STATUS_NOMATCH  1
  66 #define STATUS_BADUSAGE 2
  67 #define STATUS_ERROR    3
  68
  69 #define MIN_PID 5
  70 #define MAX_PID 99999
  71
  72 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  73 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  74                          (!kthreads && ((kp)->ki_flag & P_KTHREAD) != 0))
  75
  76 enum listtype {
  77         LT_GENERIC,
  78         LT_USER,
  79         LT_GROUP,
  80         LT_TTY,
  81         LT_PGRP,
  82         LT_JAIL,
  83         LT_SID,
  84         LT_CLASS
  85 };
  86
  87 struct list {
  88         SLIST_ENTRY(list) li_chain;
  89         long    li_number;
  90         char    *li_name;
  91 };
  92
  93 SLIST_HEAD(listhead, list);
  94
  95 static struct kinfo_proc *plist;
  96 static char     *selected;
  97 static const char *delim = "\n";
  98 static int      nproc;
  99 static int      pgrep;
 100 static int      signum = SIGTERM;
 101 static int      newest;
 102 static int      oldest;
 103 static int      interactive;
 104 static int      inverse;
 105 static int      longfmt;
 106 static int      matchargs;
 107 static int      fullmatch;
 108 static int      kthreads;
 109 static int      cflags = REG_EXTENDED;
 110 static int      quiet;
 111 static kvm_t    *kd;
 112 static pid_t    mypid;
 113
 114 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 115 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 116 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 117 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 118 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 119 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 120 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 121 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 122 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist);
 123
 124 static void     usage(void) __attribute__((__noreturn__));
 125 static int      killact(const struct kinfo_proc *);
 126 static int      grepact(const struct kinfo_proc *);
 127 static void     makelist(struct listhead *, enum listtype, char *);
 128 static int      takepid(const char *, int);
 129
 130 int
 131 main(int argc, char **argv)
 132 {
 133         char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile;
 134         const char *execf, *coref;
 135         int ancestors, debug_opt, did_action;
 136         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 137         size_t jsz;
 138         int (*action)(const struct kinfo_proc *);
 139         struct kinfo_proc *kp;
 140         struct list *li;
 141         struct timeval best_tval;
 142         regex_t reg;
 143         regmatch_t regmatch;
 144         pid_t pid;
 145
 146         setlocale(LC_ALL, "");
 147
 148         if (strcmp(getprogname(), "pgrep") == 0) {
 149                 action = grepact;
 150                 pgrep = 1;
 151         } else {
 152                 action = killact;
 153                 p = argv[1];
 154
 155                 if (argc > 1 && p[0] == '-') {
 156                         p++;
 157                         i = (int)strtol(p, &q, 10);
 158                         if (*q == '\0') {
 159                                 signum = i;
 160                                 argv++;
 161                                 argc--;
 162                         } else {
 163                                 if (strncasecmp(p, "SIG", 3) == 0)
 164                                         p += 3;
 165                                 for (i = 1; i < NSIG; i++)
 166                                         if (strcasecmp(sys_signame[i], p) == 0)
 167                                                 break;
 168                                 if (i != NSIG) {
 169                                         signum = i;
 170                                         argv++;
 171                                         argc--;
 172                                 }
 173                         }
 174                 }
 175         }
 176
 177         ancestors = 0;
 178         criteria = 0;
 179         debug_opt = 0;
 180         pidfile = NULL;
 181         pidfilelock = 0;
 182         quiet = 0;
 183         execf = NULL;
 184         coref = _PATH_DEVNULL;
 185
 186         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1)
 187                 switch (ch) {
 188                 case 'D':
 189                         debug_opt++;
 190                         break;
 191                 case 'F':
 192                         pidfile = optarg;
 193                         criteria = 1;
 194                         break;
 195                 case 'G':
 196                         makelist(&rgidlist, LT_GROUP, optarg);
 197                         criteria = 1;
 198                         break;
 199                 case 'I':
 200                         if (pgrep)
 201                                 usage();
 202                         interactive = 1;
 203                         break;
 204                 case 'L':
 205                         pidfilelock = 1;
 206                         break;
 207                 case 'M':
 208                         coref = optarg;
 209                         break;
 210                 case 'N':
 211                         execf = optarg;
 212                         break;
 213                 case 'P':
 214                         makelist(&ppidlist, LT_GENERIC, optarg);
 215                         criteria = 1;
 216                         break;
 217                 case 'S':
 218                         if (!pgrep)
 219                                 usage();
 220                         kthreads = 1;
 221                         break;
 222                 case 'U':
 223                         makelist(&ruidlist, LT_USER, optarg);
 224                         criteria = 1;
 225                         break;
 226                 case 'a':
 227                         ancestors++;
 228                         break;
 229                 case 'c':
 230                         makelist(&classlist, LT_CLASS, optarg);
 231                         criteria = 1;
 232                         break;
 233                 case 'd':
 234                         if (!pgrep)
 235                                 usage();
 236                         delim = optarg;
 237                         break;
 238                 case 'f':
 239                         matchargs = 1;
 240                         break;
 241                 case 'g':
 242                         makelist(&pgrplist, LT_PGRP, optarg);
 243                         criteria = 1;
 244                         break;
 245                 case 'i':
 246                         cflags |= REG_ICASE;
 247                         break;
 248                 case 'j':
 249                         makelist(&jidlist, LT_JAIL, optarg);
 250                         criteria = 1;
 251                         break;
 252                 case 'l':
 253                         longfmt = 1;
 254                         break;
 255                 case 'n':
 256                         newest = 1;
 257                         criteria = 1;
 258                         break;
 259                 case 'o':
 260                         oldest = 1;
 261                         criteria = 1;
 262                         break;
 263                 case 'q':
 264                         if (!pgrep)
 265                                 usage();
 266                         quiet = 1;
 267                         break;
 268                 case 's':
 269                         makelist(&sidlist, LT_SID, optarg);
 270                         criteria = 1;
 271                         break;
 272                 case 't':
 273                         makelist(&tdevlist, LT_TTY, optarg);
 274                         criteria = 1;
 275                         break;
 276                 case 'u':
 277                         makelist(&euidlist, LT_USER, optarg);
 278                         criteria = 1;
 279                         break;
 280                 case 'v':
 281                         inverse = 1;
 282                         break;
 283                 case 'x':
 284                         fullmatch = 1;
 285                         break;
 286                 default:
 287                         usage();
 288                         /* NOTREACHED */
 289                 }
 290
 291         argc -= optind;
 292         argv += optind;
 293         if (argc != 0)
 294                 criteria = 1;
 295         if (!criteria)
 296                 usage();
 297         if (newest && oldest)
 298                 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive");
 299         if (pidfile != NULL)
 300                 pidfromfile = takepid(pidfile, pidfilelock);
 301         else {
 302                 if (pidfilelock) {
 303                         errx(STATUS_ERROR,
 304                             "Option -L doesn't make sense without -F");
 305                 }
 306                 pidfromfile = -1;
 307         }
 308
 309         mypid = getpid();
 310
 311         /*
 312          * Retrieve the list of running processes from the kernel.
 313          */
 314         kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
 315         if (kd == NULL)
 316                 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
 317
 318         /*
 319          * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
 320          * just want processes and not individual kernel threads.
 321          */
 322         plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
 323         if (plist == NULL) {
 324                 errx(STATUS_ERROR, "Cannot get process list (%s)",
 325                     kvm_geterr(kd));
 326         }
 327
 328         /*
 329          * Allocate memory which will be used to keep track of the
 330          * selection.
 331          */
 332         if ((selected = malloc(nproc)) == NULL) {
 333                 err(STATUS_ERROR, "Cannot allocate memory for %d processes",
 334                     nproc);
 335         }
 336         memset(selected, 0, nproc);
 337
 338         /*
 339          * Refine the selection.
 340          */
 341         for (; *argv != NULL; argv++) {
 342                 if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
 343                         regerror(rv, &reg, buf, sizeof(buf));
 344                         errx(STATUS_BADUSAGE,
 345                             "Cannot compile regular expression `%s' (%s)",
 346                             *argv, buf);
 347                 }
 348
 349                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 350                         if (PSKIP(kp)) {
 351                                 if (debug_opt > 0)
 352                                     fprintf(stderr, "* Skipped %5d %3d %s\n",
 353                                         kp->ki_pid, kp->ki_uid, kp->ki_comm);
 354                                 continue;
 355                         }
 356
 357                         if (matchargs &&
 358                             (pargv = kvm_getargv(kd, kp, 0)) != NULL) {
 359                                 jsz = 0;
 360                                 while (jsz < sizeof(buf) && *pargv != NULL) {
 361                                         jsz += snprintf(buf + jsz,
 362                                             sizeof(buf) - jsz,
 363                                             pargv[1] != NULL ? "%s " : "%s",
 364                                             pargv[0]);
 365                                         pargv++;
 366                                 }
 367                                 mstr = buf;
 368                         } else
 369                                 mstr = kp->ki_comm;
 370
 371                         rv = regexec(&reg, mstr, 1, &regmatch, 0);
 372                         if (rv == 0) {
 373                                 if (fullmatch) {
 374                                         if (regmatch.rm_so == 0 &&
 375                                             regmatch.rm_eo ==
 376                                             (off_t)strlen(mstr))
 377                                                 selected[i] = 1;
 378                                 } else
 379                                         selected[i] = 1;
 380                         } else if (rv != REG_NOMATCH) {
 381                                 regerror(rv, &reg, buf, sizeof(buf));
 382                                 errx(STATUS_ERROR,
 383                                     "Regular expression evaluation error (%s)",
 384                                     buf);
 385                         }
 386                         if (debug_opt > 1) {
 387                                 const char *rv_res = "NoMatch";
 388                                 if (selected[i])
 389                                         rv_res = "Matched";
 390                                 fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
 391                                     kp->ki_pid, kp->ki_uid, mstr);
 392                         }
 393                 }
 394
 395                 regfree(&reg);
 396         }
 397
 398         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 399                 if (PSKIP(kp))
 400                         continue;
 401
 402                 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
 403                         selected[i] = 0;
 404                         continue;
 405                 }
 406
 407                 SLIST_FOREACH(li, &ruidlist, li_chain)
 408                         if (kp->ki_ruid == (uid_t)li->li_number)
 409                                 break;
 410                 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
 411                         selected[i] = 0;
 412                         continue;
 413                 }
 414
 415                 SLIST_FOREACH(li, &rgidlist, li_chain)
 416                         if (kp->ki_rgid == (gid_t)li->li_number)
 417                                 break;
 418                 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
 419                         selected[i] = 0;
 420                         continue;
 421                 }
 422
 423                 SLIST_FOREACH(li, &euidlist, li_chain)
 424                         if (kp->ki_uid == (uid_t)li->li_number)
 425                                 break;
 426                 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
 427                         selected[i] = 0;
 428                         continue;
 429                 }
 430
 431                 SLIST_FOREACH(li, &ppidlist, li_chain)
 432                         if (kp->ki_ppid == (pid_t)li->li_number)
 433                                 break;
 434                 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
 435                         selected[i] = 0;
 436                         continue;
 437                 }
 438
 439                 SLIST_FOREACH(li, &pgrplist, li_chain)
 440                         if (kp->ki_pgid == (pid_t)li->li_number)
 441                                 break;
 442                 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
 443                         selected[i] = 0;
 444                         continue;
 445                 }
 446
 447                 SLIST_FOREACH(li, &tdevlist, li_chain) {
 448                         if (li->li_number == -1 &&
 449                             (kp->ki_flag & P_CONTROLT) == 0)
 450                                 break;
 451                         if (kp->ki_tdev == (dev_t)li->li_number)
 452                                 break;
 453                 }
 454                 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
 455                         selected[i] = 0;
 456                         continue;
 457                 }
 458
 459                 SLIST_FOREACH(li, &sidlist, li_chain)
 460                         if (kp->ki_sid == (pid_t)li->li_number)
 461                                 break;
 462                 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
 463                         selected[i] = 0;
 464                         continue;
 465                 }
 466
 467                 SLIST_FOREACH(li, &jidlist, li_chain) {
 468                         /* A particular jail ID, including 0 (not in jail) */
 469                         if (kp->ki_jid == (int)li->li_number)
 470                                 break;
 471                         /* Any jail */
 472                         if (kp->ki_jid > 0 && li->li_number == -1)
 473                                 break;
 474                 }
 475                 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) {
 476                         selected[i] = 0;
 477                         continue;
 478                 }
 479
 480                 SLIST_FOREACH(li, &classlist, li_chain) {
 481                         /*
 482                          * We skip P_SYSTEM processes to match ps(1) output.
 483                          */
 484                         if ((kp->ki_flag & P_SYSTEM) == 0 &&
 485                             strcmp(kp->ki_loginclass, li->li_name) == 0)
 486                                 break;
 487                 }
 488                 if (SLIST_FIRST(&classlist) != NULL && li == NULL) {
 489                         selected[i] = 0;
 490                         continue;
 491                 }
 492
 493                 if (argc == 0)
 494                         selected[i] = 1;
 495         }
 496
 497         if (!ancestors) {
 498                 pid = mypid;
 499                 while (pid) {
 500                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 501                                 if (PSKIP(kp))
 502                                         continue;
 503                                 if (kp->ki_pid == pid) {
 504                                         selected[i] = 0;
 505                                         pid = kp->ki_ppid;
 506                                         break;
 507                                 }
 508                         }
 509                         if (i == nproc) {
 510                                 if (pid == mypid)
 511                                         pid = getppid();
 512                                 else
 513                                         break;  /* Maybe we're in a jail ? */
 514                         }
 515                 }
 516         }
 517
 518         if (newest || oldest) {
 519                 best_tval.tv_sec = 0;
 520                 best_tval.tv_usec = 0;
 521                 bestidx = -1;
 522
 523                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 524                         if (!selected[i])
 525                                 continue;
 526                         if (bestidx == -1) {
 527                                 /* The first entry of the list which matched. */
 528                                 ;
 529                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 530                                 /* This entry is newer than previous "best". */
 531                                 if (oldest)     /* but we want the oldest */
 532                                         continue;
 533                         } else {
 534                                 /* This entry is older than previous "best". */
 535                                 if (newest)     /* but we want the newest */
 536                                         continue;
 537                         }
 538                         /* This entry is better than previous "best" entry. */
 539                         best_tval.tv_sec = kp->ki_start.tv_sec;
 540                         best_tval.tv_usec = kp->ki_start.tv_usec;
 541                         bestidx = i;
 542                 }
 543
 544                 memset(selected, 0, nproc);
 545                 if (bestidx != -1)
 546                         selected[bestidx] = 1;
 547         }
 548
 549         /*
 550          * Take the appropriate action for each matched process, if any.
 551          */
 552         did_action = 0;
 553         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 554                 if (PSKIP(kp))
 555                         continue;
 556                 if (selected[i]) {
 557                         if (longfmt && !pgrep) {
 558                                 did_action = 1;
 559                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 560                         }
 561                         if (inverse)
 562                                 continue;
 563                 } else if (!inverse)
 564                         continue;
 565                 rv |= (*action)(kp);
 566         }
 567         if (!did_action && !pgrep && longfmt)
 568                 fprintf(stderr,
 569                     "No matching processes belonging to you were found\n");
 570
 571         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 572 }
 573
 574 static void
 575 usage(void)
 576 {
 577         const char *ustr;
 578
 579         if (pgrep)
 580                 ustr = "[-LSfilnoqvx] [-d delim]";
 581         else
 582                 ustr = "[-signal] [-ILfilnovx]";
 583
 584         fprintf(stderr,
 585                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 586                 "             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n"
 587                 "             [-s sid] [-t tty] [-u euid] pattern ...\n",
 588                 getprogname(), ustr);
 589
 590         exit(STATUS_BADUSAGE);
 591 }
 592
 593 static void
 594 show_process(const struct kinfo_proc *kp)
 595 {
 596         char **argv;
 597
 598         if (quiet) {
 599                 assert(pgrep);
 600                 return;
 601         }
 602         if ((longfmt || !pgrep) && matchargs &&
 603             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 604                 printf("%d ", (int)kp->ki_pid);
 605                 for (; *argv != NULL; argv++) {
 606                         printf("%s", *argv);
 607                         if (argv[1] != NULL)
 608                                 putchar(' ');
 609                 }
 610         } else if (longfmt || !pgrep)
 611                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 612         else
 613                 printf("%d", (int)kp->ki_pid);
 614 }
 615
 616 static int
 617 killact(const struct kinfo_proc *kp)
 618 {
 619         int ch, first;
 620
 621         if (interactive) {
 622                 /*
 623                  * Be careful, ask before killing.
 624                  */
 625                 printf("kill ");
 626                 show_process(kp);
 627                 printf("? ");
 628                 fflush(stdout);
 629                 first = ch = getchar();
 630                 while (ch != '\n' && ch != EOF)
 631                         ch = getchar();
 632                 if (first != 'y' && first != 'Y')
 633                         return (1);
 634         }
 635         if (kill(kp->ki_pid, signum) == -1) {
 636                 /*
 637                  * Check for ESRCH, which indicates that the process
 638                  * disappeared between us matching it and us
 639                  * signalling it; don't issue a warning about it.
 640                  */
 641                 if (errno != ESRCH)
 642                         warn("signalling pid %d", (int)kp->ki_pid);
 643                 /*
 644                  * Return 0 to indicate that the process should not be
 645                  * considered a match, since we didn't actually get to
 646                  * signal it.
 647                  */
 648                 return (0);
 649         }
 650         return (1);
 651 }
 652
 653 static int
 654 grepact(const struct kinfo_proc *kp)
 655 {
 656
 657         show_process(kp);
 658         if (!quiet)
 659                 printf("%s", delim);
 660         return (1);
 661 }
 662
 663 static void
 664 makelist(struct listhead *head, enum listtype type, char *src)
 665 {
 666         struct list *li;
 667         struct passwd *pw;
 668         struct group *gr;
 669         struct stat st;
 670         const char *cp;
 671         char *sp, *ep, buf[MAXPATHLEN];
 672         int empty;
 673
 674         empty = 1;
 675
 676         while ((sp = strsep(&src, ",")) != NULL) {
 677                 if (*sp == '\0')
 678                         usage();
 679
 680                 if ((li = malloc(sizeof(*li))) == NULL) {
 681                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 682                             sizeof(*li));
 683                 }
 684
 685                 SLIST_INSERT_HEAD(head, li, li_chain);
 686                 empty = 0;
 687
 688                 if (type != LT_CLASS)
 689                         li->li_number = (uid_t)strtol(sp, &ep, 0);
 690
 691                 if (type != LT_CLASS && *ep == '\0') {
 692                         switch (type) {
 693                         case LT_PGRP:
 694                                 if (li->li_number == 0)
 695                                         li->li_number = getpgrp();
 696                                 break;
 697                         case LT_SID:
 698                                 if (li->li_number == 0)
 699                                         li->li_number = getsid(mypid);
 700                                 break;
 701                         case LT_JAIL:
 702                                 if (li->li_number < 0)
 703                                         errx(STATUS_BADUSAGE,
 704                                              "Negative jail ID `%s'", sp);
 705                                 /* For compatibility with old -j */
 706                                 if (li->li_number == 0)
 707                                         li->li_number = -1;     /* any jail */
 708                                 break;
 709                         case LT_TTY:
 710                                 if (li->li_number < 0)
 711                                         errx(STATUS_BADUSAGE,
 712                                              "Negative /dev/pts tty `%s'", sp);
 713                                 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s",
 714                                     sp);
 715                                 if (stat(buf, &st) != -1)
 716                                         goto foundtty;
 717                                 if (errno == ENOENT)
 718                                         errx(STATUS_BADUSAGE, "No such tty: `"
 719                                             _PATH_DEV "pts/%s'", sp);
 720                                 err(STATUS_ERROR, "Cannot access `"
 721                                     _PATH_DEV "pts/%s'", sp);
 722                                 break;
 723                         default:
 724                                 break;
 725                         }
 726                         continue;
 727                 }
 728
 729                 switch (type) {
 730                 case LT_USER:
 731                         if ((pw = getpwnam(sp)) == NULL)
 732                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 733                         li->li_number = pw->pw_uid;
 734                         break;
 735                 case LT_GROUP:
 736                         if ((gr = getgrnam(sp)) == NULL)
 737                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 738                         li->li_number = gr->gr_gid;
 739                         break;
 740                 case LT_TTY:
 741                         if (strcmp(sp, "-") == 0) {
 742                                 li->li_number = -1;
 743                                 break;
 744                         } else if (strcmp(sp, "co") == 0) {
 745                                 cp = "console";
 746                         } else {
 747                                 cp = sp;
 748                         }
 749
 750                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 751                         if (stat(buf, &st) != -1)
 752                                 goto foundtty;
 753
 754                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 755                         if (stat(buf, &st) != -1)
 756                                 goto foundtty;
 757
 758                         if (errno == ENOENT)
 759                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 760                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 761
 762 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 763                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 764
 765                         li->li_number = st.st_rdev;
 766                         break;
 767                 case LT_JAIL: {
 768                         int jid;
 769
 770                         if (strcmp(sp, "none") == 0)
 771                                 li->li_number = 0;
 772                         else if (strcmp(sp, "any") == 0)
 773                                 li->li_number = -1;
 774                         else if ((jid = jail_getid(sp)) != -1)
 775                                 li->li_number = jid;
 776                         else if (*ep != '\0')
 777                                 errx(STATUS_BADUSAGE,
 778                                      "Invalid jail ID or name `%s'", sp);
 779                         break;
 780                 }
 781                 case LT_CLASS:
 782                         li->li_number = -1;
 783                         li->li_name = strdup(sp);
 784                         if (li->li_name == NULL)
 785                                 err(STATUS_ERROR, "Cannot allocate memory");
 786                         break;
 787                 default:
 788                         usage();
 789                 }
 790         }
 791
 792         if (empty)
 793                 usage();
 794 }
 795
 796 static int
 797 takepid(const char *pidfile, int pidfilelock)
 798 {
 799         char *endp, line[BUFSIZ];
 800         FILE *fh;
 801         long rval;
 802
 803         fh = fopen(pidfile, "r");
 804         if (fh == NULL)
 805                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 806
 807         if (pidfilelock) {
 808                 /*
 809                  * If we can lock pidfile, this means that daemon is not
 810                  * running, so would be better not to kill some random process.
 811                  */
 812                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 813                         (void)fclose(fh);
 814                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 815                 } else {
 816                         if (errno != EWOULDBLOCK) {
 817                                 errx(STATUS_ERROR,
 818                                     "Error while locking file '%s'", pidfile);
 819                         }
 820                 }
 821         }
 822
 823         if (fgets(line, sizeof(line), fh) == NULL) {
 824                 if (feof(fh)) {
 825                         (void)fclose(fh);
 826                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 827                 }
 828                 (void)fclose(fh);
 829                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 830         }
 831         (void)fclose(fh);
 832
 833         rval = strtol(line, &endp, 10);
 834         if (*endp != '\0' && !isspace((unsigned char)*endp))
 835                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 836         else if (rval < MIN_PID || rval > MAX_PID)
 837                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 838         return (rval);
 839 }