bin/pkill/pkill.c

   1 /*      $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $        */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
   5  *
   6  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   7  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Andrew Doran.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/proc.h>
  42 #include <sys/queue.h>
  43 #include <sys/stat.h>
  44 #include <sys/time.h>
  45 #include <sys/user.h>
  46
  47 #include <assert.h>
  48 #include <stdbool.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <limits.h>
  52 #include <paths.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <signal.h>
  56 #include <regex.h>
  57 #include <ctype.h>
  58 #include <fcntl.h>
  59 #include <kvm.h>
  60 #include <err.h>
  61 #include <pwd.h>
  62 #include <grp.h>
  63 #include <errno.h>
  64 #include <locale.h>
  65 #include <jail.h>
  66
  67 #define STATUS_MATCH    0
  68 #define STATUS_NOMATCH  1
  69 #define STATUS_BADUSAGE 2
  70 #define STATUS_ERROR    3
  71
  72 #define MIN_PID 5
  73 #define MAX_PID 99999
  74
  75 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  76 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  77                          (!kthreads && ((kp)->ki_flag & P_KPROC) != 0))
  78
  79 enum listtype {
  80         LT_GENERIC,
  81         LT_USER,
  82         LT_GROUP,
  83         LT_TTY,
  84         LT_PGRP,
  85         LT_JAIL,
  86         LT_SID,
  87         LT_CLASS
  88 };
  89
  90 struct list {
  91         SLIST_ENTRY(list) li_chain;
  92         long    li_number;
  93         char    *li_name;
  94 };
  95
  96 SLIST_HEAD(listhead, list);
  97
  98 static struct kinfo_proc *plist;
  99 static char     *selected;
 100 static const char *delim = "\n";
 101 static int      nproc;
 102 static int      pgrep;
 103 static int      signum = SIGTERM;
 104 static int      newest;
 105 static int      oldest;
 106 static int      interactive;
 107 static int      inverse;
 108 static int      longfmt;
 109 static int      matchargs;
 110 static int      fullmatch;
 111 static int      kthreads;
 112 static int      cflags = REG_EXTENDED;
 113 static int      quiet;
 114 static kvm_t    *kd;
 115 static pid_t    mypid;
 116
 117 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 118 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 119 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 120 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 121 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 122 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 123 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 124 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 125 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist);
 126
 127 static void     usage(void) __attribute__((__noreturn__));
 128 static int      killact(const struct kinfo_proc *);
 129 static int      grepact(const struct kinfo_proc *);
 130 static void     makelist(struct listhead *, enum listtype, char *);
 131 static int      takepid(const char *, int);
 132
 133 int
 134 main(int argc, char **argv)
 135 {
 136         char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile;
 137         const char *execf, *coref;
 138         int ancestors, debug_opt, did_action;
 139         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 140         size_t jsz;
 141         int (*action)(const struct kinfo_proc *);
 142         struct kinfo_proc *kp;
 143         struct list *li;
 144         struct timeval best_tval;
 145         regex_t reg;
 146         regmatch_t regmatch;
 147         pid_t pid;
 148
 149         setlocale(LC_ALL, "");
 150
 151         if (strcmp(getprogname(), "pgrep") == 0) {
 152                 action = grepact;
 153                 pgrep = 1;
 154         } else {
 155                 action = killact;
 156                 p = argv[1];
 157
 158                 if (argc > 1 && p[0] == '-') {
 159                         p++;
 160                         i = (int)strtol(p, &q, 10);
 161                         if (*q == '\0') {
 162                                 signum = i;
 163                                 argv++;
 164                                 argc--;
 165                         } else {
 166                                 if (strncasecmp(p, "SIG", 3) == 0)
 167                                         p += 3;
 168                                 for (i = 1; i < NSIG; i++)
 169                                         if (strcasecmp(sys_signame[i], p) == 0)
 170                                                 break;
 171                                 if (i != NSIG) {
 172                                         signum = i;
 173                                         argv++;
 174                                         argc--;
 175                                 }
 176                         }
 177                 }
 178         }
 179
 180         ancestors = 0;
 181         criteria = 0;
 182         debug_opt = 0;
 183         pidfile = NULL;
 184         pidfilelock = 0;
 185         quiet = 0;
 186         execf = NULL;
 187         coref = _PATH_DEVNULL;
 188
 189         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1)
 190                 switch (ch) {
 191                 case 'D':
 192                         debug_opt++;
 193                         break;
 194                 case 'F':
 195                         pidfile = optarg;
 196                         criteria = 1;
 197                         break;
 198                 case 'G':
 199                         makelist(&rgidlist, LT_GROUP, optarg);
 200                         criteria = 1;
 201                         break;
 202                 case 'I':
 203                         if (pgrep)
 204                                 usage();
 205                         interactive = 1;
 206                         break;
 207                 case 'L':
 208                         pidfilelock = 1;
 209                         break;
 210                 case 'M':
 211                         coref = optarg;
 212                         break;
 213                 case 'N':
 214                         execf = optarg;
 215                         break;
 216                 case 'P':
 217                         makelist(&ppidlist, LT_GENERIC, optarg);
 218                         criteria = 1;
 219                         break;
 220                 case 'S':
 221                         if (!pgrep)
 222                                 usage();
 223                         kthreads = 1;
 224                         break;
 225                 case 'U':
 226                         makelist(&ruidlist, LT_USER, optarg);
 227                         criteria = 1;
 228                         break;
 229                 case 'a':
 230                         ancestors++;
 231                         break;
 232                 case 'c':
 233                         makelist(&classlist, LT_CLASS, optarg);
 234                         criteria = 1;
 235                         break;
 236                 case 'd':
 237                         if (!pgrep)
 238                                 usage();
 239                         delim = optarg;
 240                         break;
 241                 case 'f':
 242                         matchargs = 1;
 243                         break;
 244                 case 'g':
 245                         makelist(&pgrplist, LT_PGRP, optarg);
 246                         criteria = 1;
 247                         break;
 248                 case 'i':
 249                         cflags |= REG_ICASE;
 250                         break;
 251                 case 'j':
 252                         makelist(&jidlist, LT_JAIL, optarg);
 253                         criteria = 1;
 254                         break;
 255                 case 'l':
 256                         longfmt = 1;
 257                         break;
 258                 case 'n':
 259                         newest = 1;
 260                         criteria = 1;
 261                         break;
 262                 case 'o':
 263                         oldest = 1;
 264                         criteria = 1;
 265                         break;
 266                 case 'q':
 267                         if (!pgrep)
 268                                 usage();
 269                         quiet = 1;
 270                         break;
 271                 case 's':
 272                         makelist(&sidlist, LT_SID, optarg);
 273                         criteria = 1;
 274                         break;
 275                 case 't':
 276                         makelist(&tdevlist, LT_TTY, optarg);
 277                         criteria = 1;
 278                         break;
 279                 case 'u':
 280                         makelist(&euidlist, LT_USER, optarg);
 281                         criteria = 1;
 282                         break;
 283                 case 'v':
 284                         inverse = 1;
 285                         break;
 286                 case 'x':
 287                         fullmatch = 1;
 288                         break;
 289                 default:
 290                         usage();
 291                         /* NOTREACHED */
 292                 }
 293
 294         argc -= optind;
 295         argv += optind;
 296         if (argc != 0)
 297                 criteria = 1;
 298         if (!criteria)
 299                 usage();
 300         if (newest && oldest)
 301                 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive");
 302         if (pidfile != NULL)
 303                 pidfromfile = takepid(pidfile, pidfilelock);
 304         else {
 305                 if (pidfilelock) {
 306                         errx(STATUS_ERROR,
 307                             "Option -L doesn't make sense without -F");
 308                 }
 309                 pidfromfile = -1;
 310         }
 311
 312         mypid = getpid();
 313
 314         /*
 315          * Retrieve the list of running processes from the kernel.
 316          */
 317         kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
 318         if (kd == NULL)
 319                 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
 320
 321         /*
 322          * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
 323          * just want processes and not individual kernel threads.
 324          */
 325         if (pidfromfile >= 0)
 326                 plist = kvm_getprocs(kd, KERN_PROC_PID, pidfromfile, &nproc);
 327         else
 328                 plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
 329         if (plist == NULL) {
 330                 errx(STATUS_ERROR, "Cannot get process list (%s)",
 331                     kvm_geterr(kd));
 332         }
 333
 334         /*
 335          * Allocate memory which will be used to keep track of the
 336          * selection.
 337          */
 338         if ((selected = malloc(nproc)) == NULL) {
 339                 err(STATUS_ERROR, "Cannot allocate memory for %d processes",
 340                     nproc);
 341         }
 342         memset(selected, 0, nproc);
 343
 344         /*
 345          * Refine the selection.
 346          */
 347         for (; *argv != NULL; argv++) {
 348                 if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
 349                         regerror(rv, &reg, buf, sizeof(buf));
 350                         errx(STATUS_BADUSAGE,
 351                             "Cannot compile regular expression `%s' (%s)",
 352                             *argv, buf);
 353                 }
 354
 355                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 356                         if (PSKIP(kp)) {
 357                                 if (debug_opt > 0)
 358                                     fprintf(stderr, "* Skipped %5d %3d %s\n",
 359                                         kp->ki_pid, kp->ki_uid, kp->ki_comm);
 360                                 continue;
 361                         }
 362
 363                         if (matchargs &&
 364                             (pargv = kvm_getargv(kd, kp, 0)) != NULL) {
 365                                 jsz = 0;
 366                                 while (jsz < sizeof(buf) && *pargv != NULL) {
 367                                         jsz += snprintf(buf + jsz,
 368                                             sizeof(buf) - jsz,
 369                                             pargv[1] != NULL ? "%s " : "%s",
 370                                             pargv[0]);
 371                                         pargv++;
 372                                 }
 373                                 mstr = buf;
 374                         } else
 375                                 mstr = kp->ki_comm;
 376
 377                         rv = regexec(&reg, mstr, 1, &regmatch, 0);
 378                         if (rv == 0) {
 379                                 if (fullmatch) {
 380                                         if (regmatch.rm_so == 0 &&
 381                                             regmatch.rm_eo ==
 382                                             (off_t)strlen(mstr))
 383                                                 selected[i] = 1;
 384                                 } else
 385                                         selected[i] = 1;
 386                         } else if (rv != REG_NOMATCH) {
 387                                 regerror(rv, &reg, buf, sizeof(buf));
 388                                 errx(STATUS_ERROR,
 389                                     "Regular expression evaluation error (%s)",
 390                                     buf);
 391                         }
 392                         if (debug_opt > 1) {
 393                                 const char *rv_res = "NoMatch";
 394                                 if (selected[i])
 395                                         rv_res = "Matched";
 396                                 fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
 397                                     kp->ki_pid, kp->ki_uid, mstr);
 398                         }
 399                 }
 400
 401                 regfree(&reg);
 402         }
 403
 404         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 405                 if (PSKIP(kp))
 406                         continue;
 407
 408                 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
 409                         selected[i] = 0;
 410                         continue;
 411                 }
 412
 413                 SLIST_FOREACH(li, &ruidlist, li_chain)
 414                         if (kp->ki_ruid == (uid_t)li->li_number)
 415                                 break;
 416                 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
 417                         selected[i] = 0;
 418                         continue;
 419                 }
 420
 421                 SLIST_FOREACH(li, &rgidlist, li_chain)
 422                         if (kp->ki_rgid == (gid_t)li->li_number)
 423                                 break;
 424                 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
 425                         selected[i] = 0;
 426                         continue;
 427                 }
 428
 429                 SLIST_FOREACH(li, &euidlist, li_chain)
 430                         if (kp->ki_uid == (uid_t)li->li_number)
 431                                 break;
 432                 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
 433                         selected[i] = 0;
 434                         continue;
 435                 }
 436
 437                 SLIST_FOREACH(li, &ppidlist, li_chain)
 438                         if (kp->ki_ppid == (pid_t)li->li_number)
 439                                 break;
 440                 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
 441                         selected[i] = 0;
 442                         continue;
 443                 }
 444
 445                 SLIST_FOREACH(li, &pgrplist, li_chain)
 446                         if (kp->ki_pgid == (pid_t)li->li_number)
 447                                 break;
 448                 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
 449                         selected[i] = 0;
 450                         continue;
 451                 }
 452
 453                 SLIST_FOREACH(li, &tdevlist, li_chain) {
 454                         if (li->li_number == -1 &&
 455                             (kp->ki_flag & P_CONTROLT) == 0)
 456                                 break;
 457                         if (kp->ki_tdev == (dev_t)li->li_number)
 458                                 break;
 459                 }
 460                 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
 461                         selected[i] = 0;
 462                         continue;
 463                 }
 464
 465                 SLIST_FOREACH(li, &sidlist, li_chain)
 466                         if (kp->ki_sid == (pid_t)li->li_number)
 467                                 break;
 468                 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
 469                         selected[i] = 0;
 470                         continue;
 471                 }
 472
 473                 SLIST_FOREACH(li, &jidlist, li_chain) {
 474                         /* A particular jail ID, including 0 (not in jail) */
 475                         if (kp->ki_jid == (int)li->li_number)
 476                                 break;
 477                         /* Any jail */
 478                         if (kp->ki_jid > 0 && li->li_number == -1)
 479                                 break;
 480                 }
 481                 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) {
 482                         selected[i] = 0;
 483                         continue;
 484                 }
 485
 486                 SLIST_FOREACH(li, &classlist, li_chain) {
 487                         /*
 488                          * We skip P_SYSTEM processes to match ps(1) output.
 489                          */
 490                         if ((kp->ki_flag & P_SYSTEM) == 0 &&
 491                             strcmp(kp->ki_loginclass, li->li_name) == 0)
 492                                 break;
 493                 }
 494                 if (SLIST_FIRST(&classlist) != NULL && li == NULL) {
 495                         selected[i] = 0;
 496                         continue;
 497                 }
 498
 499                 if (argc == 0)
 500                         selected[i] = 1;
 501         }
 502
 503         if (!ancestors) {
 504                 pid = mypid;
 505                 while (pid) {
 506                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 507                                 if (PSKIP(kp))
 508                                         continue;
 509                                 if (kp->ki_pid == pid) {
 510                                         selected[i] = 0;
 511                                         pid = kp->ki_ppid;
 512                                         break;
 513                                 }
 514                         }
 515                         if (i == nproc) {
 516                                 if (pid == mypid)
 517                                         pid = getppid();
 518                                 else
 519                                         break;  /* Maybe we're in a jail ? */
 520                         }
 521                 }
 522         }
 523
 524         if (newest || oldest) {
 525                 best_tval.tv_sec = 0;
 526                 best_tval.tv_usec = 0;
 527                 bestidx = -1;
 528
 529                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 530                         if (!selected[i])
 531                                 continue;
 532                         if (bestidx == -1) {
 533                                 /* The first entry of the list which matched. */
 534                                 ;
 535                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 536                                 /* This entry is newer than previous "best". */
 537                                 if (oldest)     /* but we want the oldest */
 538                                         continue;
 539                         } else {
 540                                 /* This entry is older than previous "best". */
 541                                 if (newest)     /* but we want the newest */
 542                                         continue;
 543                         }
 544                         /* This entry is better than previous "best" entry. */
 545                         best_tval.tv_sec = kp->ki_start.tv_sec;
 546                         best_tval.tv_usec = kp->ki_start.tv_usec;
 547                         bestidx = i;
 548                 }
 549
 550                 memset(selected, 0, nproc);
 551                 if (bestidx != -1)
 552                         selected[bestidx] = 1;
 553         }
 554
 555         /*
 556          * Take the appropriate action for each matched process, if any.
 557          */
 558         did_action = 0;
 559         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 560                 if (PSKIP(kp))
 561                         continue;
 562                 if (selected[i]) {
 563                         if (longfmt && !pgrep) {
 564                                 did_action = 1;
 565                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 566                         }
 567                         if (inverse)
 568                                 continue;
 569                 } else if (!inverse)
 570                         continue;
 571                 rv |= (*action)(kp);
 572         }
 573         if (rv && pgrep && !quiet)
 574                 putchar('\n');
 575         if (!did_action && !pgrep && longfmt)
 576                 fprintf(stderr,
 577                     "No matching processes belonging to you were found\n");
 578
 579         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 580 }
 581
 582 static void
 583 usage(void)
 584 {
 585         const char *ustr;
 586
 587         if (pgrep)
 588                 ustr = "[-LSfilnoqvx] [-d delim]";
 589         else
 590                 ustr = "[-signal] [-ILfilnovx]";
 591
 592         fprintf(stderr,
 593                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 594                 "             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n"
 595                 "             [-s sid] [-t tty] [-u euid] pattern ...\n",
 596                 getprogname(), ustr);
 597
 598         exit(STATUS_BADUSAGE);
 599 }
 600
 601 static void
 602 show_process(const struct kinfo_proc *kp)
 603 {
 604         char **argv;
 605
 606         if (quiet) {
 607                 assert(pgrep);
 608                 return;
 609         }
 610         if ((longfmt || !pgrep) && matchargs &&
 611             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 612                 printf("%d ", (int)kp->ki_pid);
 613                 for (; *argv != NULL; argv++) {
 614                         printf("%s", *argv);
 615                         if (argv[1] != NULL)
 616                                 putchar(' ');
 617                 }
 618         } else if (longfmt || !pgrep)
 619                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 620         else
 621                 printf("%d", (int)kp->ki_pid);
 622 }
 623
 624 static int
 625 killact(const struct kinfo_proc *kp)
 626 {
 627         int ch, first;
 628
 629         if (interactive) {
 630                 /*
 631                  * Be careful, ask before killing.
 632                  */
 633                 printf("kill ");
 634                 show_process(kp);
 635                 printf("? ");
 636                 fflush(stdout);
 637                 first = ch = getchar();
 638                 while (ch != '\n' && ch != EOF)
 639                         ch = getchar();
 640                 if (first != 'y' && first != 'Y')
 641                         return (1);
 642         }
 643         if (kill(kp->ki_pid, signum) == -1) {
 644                 /*
 645                  * Check for ESRCH, which indicates that the process
 646                  * disappeared between us matching it and us
 647                  * signalling it; don't issue a warning about it.
 648                  */
 649                 if (errno != ESRCH)
 650                         warn("signalling pid %d", (int)kp->ki_pid);
 651                 /*
 652                  * Return 0 to indicate that the process should not be
 653                  * considered a match, since we didn't actually get to
 654                  * signal it.
 655                  */
 656                 return (0);
 657         }
 658         return (1);
 659 }
 660
 661 static int
 662 grepact(const struct kinfo_proc *kp)
 663 {
 664         static bool first = true;
 665
 666         if (!quiet && !first)
 667                 printf("%s", delim);
 668         show_process(kp);
 669         first = false;
 670         return (1);
 671 }
 672
 673 static void
 674 makelist(struct listhead *head, enum listtype type, char *src)
 675 {
 676         struct list *li;
 677         struct passwd *pw;
 678         struct group *gr;
 679         struct stat st;
 680         const char *cp;
 681         char *sp, *ep, buf[MAXPATHLEN];
 682         int empty;
 683
 684         empty = 1;
 685
 686         while ((sp = strsep(&src, ",")) != NULL) {
 687                 if (*sp == '\0')
 688                         usage();
 689
 690                 if ((li = malloc(sizeof(*li))) == NULL) {
 691                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 692                             sizeof(*li));
 693                 }
 694
 695                 SLIST_INSERT_HEAD(head, li, li_chain);
 696                 empty = 0;
 697
 698                 if (type != LT_CLASS)
 699                         li->li_number = (uid_t)strtol(sp, &ep, 0);
 700
 701                 if (type != LT_CLASS && *ep == '\0') {
 702                         switch (type) {
 703                         case LT_PGRP:
 704                                 if (li->li_number == 0)
 705                                         li->li_number = getpgrp();
 706                                 break;
 707                         case LT_SID:
 708                                 if (li->li_number == 0)
 709                                         li->li_number = getsid(mypid);
 710                                 break;
 711                         case LT_JAIL:
 712                                 if (li->li_number < 0)
 713                                         errx(STATUS_BADUSAGE,
 714                                              "Negative jail ID `%s'", sp);
 715                                 /* For compatibility with old -j */
 716                                 if (li->li_number == 0)
 717                                         li->li_number = -1;     /* any jail */
 718                                 break;
 719                         case LT_TTY:
 720                                 if (li->li_number < 0)
 721                                         errx(STATUS_BADUSAGE,
 722                                              "Negative /dev/pts tty `%s'", sp);
 723                                 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s",
 724                                     sp);
 725                                 if (stat(buf, &st) != -1)
 726                                         goto foundtty;
 727                                 if (errno == ENOENT)
 728                                         errx(STATUS_BADUSAGE, "No such tty: `"
 729                                             _PATH_DEV "pts/%s'", sp);
 730                                 err(STATUS_ERROR, "Cannot access `"
 731                                     _PATH_DEV "pts/%s'", sp);
 732                                 break;
 733                         default:
 734                                 break;
 735                         }
 736                         continue;
 737                 }
 738
 739                 switch (type) {
 740                 case LT_USER:
 741                         if ((pw = getpwnam(sp)) == NULL)
 742                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 743                         li->li_number = pw->pw_uid;
 744                         break;
 745                 case LT_GROUP:
 746                         if ((gr = getgrnam(sp)) == NULL)
 747                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 748                         li->li_number = gr->gr_gid;
 749                         break;
 750                 case LT_TTY:
 751                         if (strcmp(sp, "-") == 0) {
 752                                 li->li_number = -1;
 753                                 break;
 754                         } else if (strcmp(sp, "co") == 0) {
 755                                 cp = "console";
 756                         } else {
 757                                 cp = sp;
 758                         }
 759
 760                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 761                         if (stat(buf, &st) != -1)
 762                                 goto foundtty;
 763
 764                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 765                         if (stat(buf, &st) != -1)
 766                                 goto foundtty;
 767
 768                         if (errno == ENOENT)
 769                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 770                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 771
 772 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 773                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 774
 775                         li->li_number = st.st_rdev;
 776                         break;
 777                 case LT_JAIL: {
 778                         int jid;
 779
 780                         if (strcmp(sp, "none") == 0)
 781                                 li->li_number = 0;
 782                         else if (strcmp(sp, "any") == 0)
 783                                 li->li_number = -1;
 784                         else if ((jid = jail_getid(sp)) != -1)
 785                                 li->li_number = jid;
 786                         else if (*ep != '\0')
 787                                 errx(STATUS_BADUSAGE,
 788                                      "Invalid jail ID or name `%s'", sp);
 789                         break;
 790                 }
 791                 case LT_CLASS:
 792                         li->li_number = -1;
 793                         li->li_name = strdup(sp);
 794                         if (li->li_name == NULL)
 795                                 err(STATUS_ERROR, "Cannot allocate memory");
 796                         break;
 797                 default:
 798                         usage();
 799                 }
 800         }
 801
 802         if (empty)
 803                 usage();
 804 }
 805
 806 static int
 807 takepid(const char *pidfile, int pidfilelock)
 808 {
 809         char *endp, line[BUFSIZ];
 810         FILE *fh;
 811         long rval;
 812
 813         fh = fopen(pidfile, "r");
 814         if (fh == NULL)
 815                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 816
 817         if (pidfilelock) {
 818                 /*
 819                  * If we can lock pidfile, this means that daemon is not
 820                  * running, so would be better not to kill some random process.
 821                  */
 822                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 823                         (void)fclose(fh);
 824                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 825                 } else {
 826                         if (errno != EWOULDBLOCK) {
 827                                 errx(STATUS_ERROR,
 828                                     "Error while locking file '%s'", pidfile);
 829                         }
 830                 }
 831         }
 832
 833         if (fgets(line, sizeof(line), fh) == NULL) {
 834                 if (feof(fh)) {
 835                         (void)fclose(fh);
 836                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 837                 }
 838                 (void)fclose(fh);
 839                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 840         }
 841         (void)fclose(fh);
 842
 843         rval = strtol(line, &endp, 10);
 844         if (*endp != '\0' && !isspace((unsigned char)*endp))
 845                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 846         else if (rval < MIN_PID || rval > MAX_PID)
 847                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 848         return (rval);
 849 }