* Handle deleted binaries in pidof (was local bug #34992)
[sysvinit.git] / src / killall5.c
CommitLineData
a74aeac6
PR
1/*
2 * kilall5.c Kill all processes except processes that have the
3 * same session id, so that the shell that called us
4 * won't be killed. Typically used in shutdown scripts.
5 *
6 * pidof.c Tries to get the pid of the process[es] named.
7 *
8 * Version: 2.86 30-Jul-2004 MvS
9 *
10 * Usage: killall5 [-][signal]
11 * pidof [-s] [-o omitpid [-o omitpid]] program [program..]
12 *
13 * Authors: Miquel van Smoorenburg, miquels@cistron.nl
14 *
15 * Riku Meskanen, <mesrik@jyu.fi>
16 * - return all running pids of given program name
17 * - single shot '-s' option for backwards combatibility
18 * - omit pid '-o' option and %PPID (parent pid metavariable)
19 * - syslog() only if not a connected to controlling terminal
20 * - swapped out programs pids are caught now
21 *
40fc1ac0
DWF
22 * Werner Fink
23 * - make omit dynamic
24 * - provide '-n' to skip stat(2) syscall on network based FS
25 *
a74aeac6
PR
26 * This file is part of the sysvinit suite,
27 * Copyright (C) 1991-2004 Miquel van Smoorenburg.
28 *
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation; either version 2 of the License, or
32 * (at your option) any later version.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * You should have received a copy of the GNU General Public License
40 * along with this program; if not, write to the Free Software
41 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
42 */
40fc1ac0 43#include <dirent.h>
a74aeac6 44#include <errno.h>
40fc1ac0 45#include <getopt.h>
64953d94 46#include <limits.h>
40fc1ac0
DWF
47#include <mntent.h>
48#include <stdarg.h>
49#include <stdio.h>
a74aeac6 50#include <stdlib.h>
a74aeac6 51#include <signal.h>
40fc1ac0 52#include <string.h>
a74aeac6 53#include <syslog.h>
a74aeac6 54#include <sys/mman.h>
40fc1ac0
DWF
55#include <sys/param.h>
56#include <sys/stat.h>
57#include <sys/types.h>
58#include <sys/wait.h>
59#include <unistd.h>
a74aeac6
PR
60
61char *Version = "@(#)killall5 2.86 31-Jul-2004 miquels@cistron.nl";
62
64953d94
DWF
63#ifndef PATH_MAX
64# ifdef MAXPATHLEN
65# define PATH_MAX MAXPATHLEN
66# else
67# define PATH_MAX 2048
68# endif
69#endif
70
a74aeac6 71#define STATNAMELEN 15
40fc1ac0 72#define DO_NETFS 2
a74aeac6
PR
73#define DO_STAT 1
74#define NO_STAT 0
75
76/* Info about a process. */
77typedef struct proc {
c5ae561e 78 char *pathname; /* full path to executable */
a74aeac6
PR
79 char *argv0; /* Name as found out from argv[0] */
80 char *argv0base; /* `basename argv[1]` */
81 char *argv1; /* Name as found out from argv[1] */
82 char *argv1base; /* `basename argv[1]` */
83 char *statname; /* the statname without braces */
84 ino_t ino; /* Inode number */
85 dev_t dev; /* Device it is on */
86 pid_t pid; /* Process ID. */
40fc1ac0
DWF
87 pid_t sid; /* Session ID. */
88 char kernel; /* Kernel thread or zombie. */
89 char nfs; /* Name found on network FS. */
a74aeac6
PR
90 struct proc *next; /* Pointer to next struct. */
91} PROC;
92
93/* pid queue */
94
95typedef struct pidq {
96 PROC *proc;
97 struct pidq *next;
98} PIDQ;
99
100typedef struct {
101 PIDQ *head;
102 PIDQ *tail;
103 PIDQ *next;
104} PIDQ_HEAD;
105
40fc1ac0
DWF
106typedef struct _s_omit {
107 struct _s_omit *next;
108 struct _s_omit *prev;
109 pid_t pid;
110} OMIT;
111
112typedef struct _s_shadow
113{
114 struct _s_shadow *next;
115 struct _s_shadow *prev;
116 size_t nlen;
117 char * name;
118} SHADOW;
119
120typedef struct _s_nfs
121{
122 struct _s_nfs *next; /* Pointer to next struct. */
123 struct _s_nfs *prev; /* Pointer to previous st. */
124 SHADOW *shadow; /* Pointer to shadows */
40fc1ac0 125 size_t nlen;
58608f87 126 char * name;
40fc1ac0
DWF
127} NFS;
128
a74aeac6
PR
129/* List of processes. */
130PROC *plist;
131
40fc1ac0
DWF
132/* List of processes to omit. */
133OMIT *omit;
134
135/* List of NFS mountes partitions. */
136NFS *nlist;
137
a74aeac6
PR
138/* Did we stop all processes ? */
139int sent_sigstop;
140
141int scripts_too = 0;
142
143char *progname; /* the name of the running program */
144#ifdef __GNUC__
145__attribute__ ((format (printf, 2, 3)))
146#endif
147void nsyslog(int pri, char *fmt, ...);
148
40fc1ac0
DWF
149#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
150# ifndef inline
151# define inline __inline__
152# endif
153# ifndef restrict
154# define restrict __restrict__
155# endif
156#endif
157#define alignof(type) ((sizeof(type)+(sizeof(void*)-1)) & ~(sizeof(void*)-1))
158
a74aeac6
PR
159/*
160 * Malloc space, barf if out of memory.
161 */
40fc1ac0
DWF
162#ifdef __GNUC__
163static void *xmalloc(size_t) __attribute__ ((__malloc__));
164#endif
165static void *xmalloc(size_t bytes)
a74aeac6
PR
166{
167 void *p;
168
169 if ((p = malloc(bytes)) == NULL) {
170 if (sent_sigstop) kill(-1, SIGCONT);
171 nsyslog(LOG_ERR, "out of memory");
172 exit(1);
173 }
174 return p;
175}
176
40fc1ac0
DWF
177#ifdef __GNUC__
178static inline void xmemalign(void **, size_t, size_t) __attribute__ ((__nonnull__ (1)));
179#endif
180static inline void xmemalign(void **memptr, size_t alignment, size_t size)
181{
182 if ((posix_memalign(memptr, alignment, size)) < 0) {
183 if (sent_sigstop) kill(-1, SIGCONT);
184 nsyslog(LOG_ERR, "out of memory");
185 exit(1);
186 }
187}
188
a74aeac6
PR
189/*
190 * See if the proc filesystem is there. Mount if needed.
191 */
192int mount_proc(void)
193{
194 struct stat st;
195 char *args[] = { "mount", "-t", "proc", "proc", "/proc", 0 };
196 pid_t pid, rc;
197 int wst;
198 int did_mount = 0;
199
200 /* Stat /proc/version to see if /proc is mounted. */
201 if (stat("/proc/version", &st) < 0 && errno == ENOENT) {
202
203 /* It's not there, so mount it. */
204 if ((pid = fork()) < 0) {
205 nsyslog(LOG_ERR, "cannot fork");
206 exit(1);
207 }
208 if (pid == 0) {
209 /* Try a few mount binaries. */
a74aeac6 210 execv("/bin/mount", args);
c5ae561e 211 execv("/sbin/mount", args);
a74aeac6
PR
212
213 /* Okay, I give up. */
214 nsyslog(LOG_ERR, "cannot execute mount");
215 exit(1);
216 }
217 /* Wait for child. */
218 while ((rc = wait(&wst)) != pid)
219 if (rc < 0 && errno == ECHILD)
220 break;
221 if (rc != pid || WEXITSTATUS(wst) != 0)
222 nsyslog(LOG_ERR, "mount returned non-zero exit status");
223
224 did_mount = 1;
225 }
226
227 /* See if mount succeeded. */
228 if (stat("/proc/version", &st) < 0) {
229 if (errno == ENOENT)
230 nsyslog(LOG_ERR, "/proc not mounted, failed to mount.");
231 else
232 nsyslog(LOG_ERR, "/proc unavailable.");
233 exit(1);
234 }
235
236 return did_mount;
237}
238
40fc1ac0
DWF
239static inline int isnetfs(const char * type)
240{
241 static const char* netfs[] = {"nfs", "nfs4", "smbfs", "cifs", "afs", "ncpfs", (char*)0};
242 int n;
243 for (n = 0; netfs[n]; n++) {
244 if (!strcasecmp(netfs[n], type))
245 return 1;
246 }
247 return 0;
248}
249
250/*
251 * Remember all NFS typed partitions.
252 */
253void init_nfs(void)
254{
255 struct stat st;
256 struct mntent * ent;
257 FILE * mnt;
21421926 258
40fc1ac0 259 nlist = (NFS*)0;
21421926 260
40fc1ac0
DWF
261 if (stat("/proc/version", &st) < 0)
262 return;
263 if ((mnt = setmntent("/proc/mounts", "r")) == (FILE*)0)
264 return;
21421926 265
40fc1ac0
DWF
266 while ((ent = getmntent(mnt))) {
267 if (isnetfs(ent->mnt_type)) {
268 size_t nlen = strlen(ent->mnt_dir);
269 NFS *restrict p;
270 xmemalign((void*)&p, sizeof(void*), alignof(NFS)+(nlen+1));
271 p->name = ((char*)p)+alignof(NFS);
272 p->nlen = nlen;
273 p->shadow = (SHADOW*)0;
21421926 274
40fc1ac0
DWF
275 strcpy(p->name, ent->mnt_dir);
276 if (nlist)
277 nlist->prev = p;
278 p->next = nlist;
279 p->prev = (NFS*)0;
280 nlist = p;
281 }
282 }
283 endmntent(mnt);
21421926 284
40fc1ac0
DWF
285 if ((mnt = setmntent("/proc/mounts", "r")) == (FILE*)0)
286 return;
21421926 287
40fc1ac0
DWF
288 while ((ent = getmntent(mnt))) {
289 NFS *p;
21421926 290
40fc1ac0
DWF
291 for (p = nlist; p; p = p->next) {
292 SHADOW * restrict s;
293 size_t nlen;
21421926 294
40fc1ac0
DWF
295 if (strcmp(ent->mnt_dir, p->name) == 0)
296 continue;
297 if (strncmp(ent->mnt_dir, p->name, p->nlen) != 0)
298 continue;
21421926 299
40fc1ac0
DWF
300 nlen = strlen(ent->mnt_dir);
301 xmemalign((void*)&s, sizeof(void*), alignof(SHADOW)+(nlen+1));
302 s->name = ((char*)s)+alignof(SHADOW);
303 s->nlen = nlen;
21421926 304
40fc1ac0
DWF
305 strcpy(s->name, ent->mnt_dir);
306 if (p->shadow)
307 p->shadow->prev = s;
308 s->next = p->shadow;
309 s->prev = (SHADOW*)0;
310 p->shadow = s;
311 }
312 }
313 endmntent(mnt);
314}
315
316static void clear_shadow(SHADOW *restrict shadow)
317{
318 SHADOW *s, *n, *l;
21421926 319
40fc1ac0
DWF
320 n = shadow;
321 l = (SHADOW*)0;
322 for (s = shadow; n; s = n) {
323 l = s->prev;
324 n = s->next;
325 if (s == shadow) {
326 if (n) n->prev = (SHADOW*)0;
327 shadow = n;
328 } else if (l) {
329 if (n) n->prev = l;
330 l->next = n;
331 }
332 free(s);
333 }
334}
335
336static void clear_mnt(void)
337{
338 NFS *p, *n, *l;
21421926 339
40fc1ac0
DWF
340 n = nlist;
341 l = (NFS*)0;
342 for (p = nlist; n; p = n) {
343 l = p->prev;
344 n = p->next;
345 if (p == nlist) {
346 if (n) n->prev = (NFS*)0;
347 nlist = n;
348 } else if (l) {
349 if (n) n->prev = l;
350 l->next = n;
351 }
352 if (p->shadow)
353 clear_shadow(p->shadow);
354 free(p);
355 }
356}
357
358/*
58608f87 359 * Check if path is a shadow off a NFS partition.
40fc1ac0
DWF
360 */
361static int shadow(SHADOW *restrict this, const char *restrict name, const size_t nlen)
362{
363 SHADOW *s;
21421926 364
40fc1ac0
DWF
365 if (!this)
366 goto out;
367 for (s = this; s; s = s->next) {
368 if (nlen < s->nlen)
369 continue;
370 if (name[s->nlen] != '\0' && name[s->nlen] != '/')
371 continue;
372 if (strncmp(name, s->name, s->nlen) == 0)
373 return 1;
374 }
375out:
376 return 0;
377}
378
379/*
380 * Check path is located on a network based partition.
381 */
382int check4nfs(const char * path, char * real)
383{
384 char buf[PATH_MAX+1];
385 const char *curr;
386 int deep = MAXSYMLINKS;
21421926 387
40fc1ac0 388 if (!nlist) return 0;
21421926 389
40fc1ac0
DWF
390 curr = path;
391 do {
392 const char *prev;
393 int len;
21421926 394
40fc1ac0
DWF
395 if ((prev = strdupa(curr)) == NULL) {
396 nsyslog(LOG_ERR, "strdupa(): %s\n", strerror(errno));
397 return 0;
398 }
21421926 399
40fc1ac0
DWF
400 errno = 0;
401 if ((len = readlink(curr, buf, PATH_MAX)) < 0)
402 break;
403 buf[len] = '\0';
21421926 404
40fc1ac0
DWF
405 if (buf[0] != '/') {
406 const char *slash;
21421926 407
40fc1ac0
DWF
408 if ((slash = strrchr(prev, '/'))) {
409 size_t off = slash - prev + 1;
21421926 410
40fc1ac0
DWF
411 if (off + len > PATH_MAX)
412 len = PATH_MAX - off;
21421926 413
40fc1ac0
DWF
414 memmove(&buf[off], &buf[0], len + 1);
415 memcpy(&buf[0], prev, off);
416 }
417 }
418 curr = &buf[0];
21421926 419
40fc1ac0 420 if (deep-- <= 0) return 0;
21421926 421
40fc1ac0 422 } while (1);
21421926 423
40fc1ac0 424 if (real) strcpy(real, curr);
21421926 425
40fc1ac0
DWF
426 if (errno == EINVAL) {
427 const size_t nlen = strlen(curr);
428 NFS *p;
429 for (p = nlist; p; p = p->next) {
430 if (nlen < p->nlen)
431 continue;
432 if (curr[p->nlen] != '\0' && curr[p->nlen] != '/')
433 continue;
434 if (!strncmp(curr, p->name, p->nlen)) {
435 if (shadow(p->shadow, curr, nlen))
436 continue;
437 return 1;
438 }
439 }
440 }
21421926 441
40fc1ac0
DWF
442 return 0;
443}
444
a74aeac6
PR
445int readarg(FILE *fp, char *buf, int sz)
446{
447 int c = 0, f = 0;
448
449 while (f < (sz-1) && (c = fgetc(fp)) != EOF && c)
450 buf[f++] = c;
451 buf[f] = 0;
452
453 return (c == EOF && f == 0) ? c : f;
454}
455
456/*
457 * Read the proc filesystem.
458 * CWD must be /proc to avoid problems if / is affected by the killing (ie depend on fuse).
459 */
460int readproc(int do_stat)
461{
462 DIR *dir;
463 FILE *fp;
464 PROC *p, *n;
465 struct dirent *d;
466 struct stat st;
9e8dafc6
DWF
467 char path[PATH_MAX+1];
468 char buf[PATH_MAX+1];
a74aeac6
PR
469 char *s, *q;
470 unsigned long startcode, endcode;
471 int pid, f;
aef3f4ec 472 ssize_t len;
a74aeac6
PR
473
474 /* Open the /proc directory. */
475 if (chdir("/proc") == -1) {
476 nsyslog(LOG_ERR, "chdir /proc failed");
477 return -1;
478 }
479 if ((dir = opendir(".")) == NULL) {
480 nsyslog(LOG_ERR, "cannot opendir(/proc)");
481 return -1;
482 }
483
484 /* Free the already existing process list. */
485 n = plist;
486 for (p = plist; n; p = n) {
487 n = p->next;
488 if (p->argv0) free(p->argv0);
489 if (p->argv1) free(p->argv1);
40fc1ac0 490 if (p->statname) free(p->statname);
c5ae561e 491 free(p->pathname);
a74aeac6
PR
492 free(p);
493 }
494 plist = NULL;
495
496 /* Walk through the directory. */
497 while ((d = readdir(dir)) != NULL) {
498
499 /* See if this is a process */
500 if ((pid = atoi(d->d_name)) == 0) continue;
501
502 /* Get a PROC struct . */
503 p = (PROC *)xmalloc(sizeof(PROC));
504 memset(p, 0, sizeof(PROC));
505
506 /* Open the status file. */
507 snprintf(path, sizeof(path), "%s/stat", d->d_name);
508
509 /* Read SID & statname from it. */
510 if ((fp = fopen(path, "r")) != NULL) {
c5ae561e
DWF
511 if (!fgets(buf, sizeof(buf), fp))
512 buf[0] = '\0';
513
514 if (buf[0] == '\0') {
515 nsyslog(LOG_ERR,
516 "can't read from %s\n", path);
517 fclose(fp);
518 free(p);
519 continue;
520 }
a74aeac6
PR
521
522 /* See if name starts with '(' */
523 s = buf;
c5ae561e
DWF
524 while (*s && *s != ' ') s++;
525 if (*s) s++;
a74aeac6
PR
526 if (*s == '(') {
527 /* Read program name. */
528 q = strrchr(buf, ')');
529 if (q == NULL) {
530 p->sid = 0;
531 nsyslog(LOG_ERR,
532 "can't get program name from /proc/%s\n",
533 path);
c5ae561e 534 fclose(fp);
40fc1ac0
DWF
535 if (p->argv0) free(p->argv0);
536 if (p->argv1) free(p->argv1);
537 if (p->statname) free(p->statname);
c5ae561e 538 free(p->pathname);
a74aeac6
PR
539 free(p);
540 continue;
541 }
542 s++;
543 } else {
544 q = s;
c5ae561e 545 while (*q && *q != ' ') q++;
a74aeac6 546 }
c5ae561e 547 if (*q) *q++ = 0;
a74aeac6
PR
548 while (*q == ' ') q++;
549 p->statname = (char *)xmalloc(strlen(s)+1);
550 strcpy(p->statname, s);
551
552 /* Get session, startcode, endcode. */
553 startcode = endcode = 0;
554 if (sscanf(q, "%*c %*d %*d %d %*d %*d %*u %*u "
555 "%*u %*u %*u %*u %*u %*d %*d "
556 "%*d %*d %*d %*d %*u %*u %*d "
557 "%*u %lu %lu",
558 &p->sid, &startcode, &endcode) != 3) {
559 p->sid = 0;
560 nsyslog(LOG_ERR, "can't read sid from %s\n",
561 path);
c5ae561e 562 fclose(fp);
40fc1ac0
DWF
563 if (p->argv0) free(p->argv0);
564 if (p->argv1) free(p->argv1);
565 if (p->statname) free(p->statname);
c5ae561e 566 free(p->pathname);
a74aeac6
PR
567 free(p);
568 continue;
569 }
570 if (startcode == 0 && endcode == 0)
571 p->kernel = 1;
572 fclose(fp);
573 } else {
574 /* Process disappeared.. */
40fc1ac0
DWF
575 if (p->argv0) free(p->argv0);
576 if (p->argv1) free(p->argv1);
577 if (p->statname) free(p->statname);
c5ae561e 578 free(p->pathname);
a74aeac6
PR
579 free(p);
580 continue;
581 }
582
583 snprintf(path, sizeof(path), "%s/cmdline", d->d_name);
584 if ((fp = fopen(path, "r")) != NULL) {
585
586 /* Now read argv[0] */
587 f = readarg(fp, buf, sizeof(buf));
588
589 if (buf[0]) {
590 /* Store the name into malloced memory. */
591 p->argv0 = (char *)xmalloc(f + 1);
592 strcpy(p->argv0, buf);
593
594 /* Get a pointer to the basename. */
595 p->argv0base = strrchr(p->argv0, '/');
596 if (p->argv0base != NULL)
597 p->argv0base++;
598 else
599 p->argv0base = p->argv0;
600 }
601
602 /* And read argv[1] */
603 while ((f = readarg(fp, buf, sizeof(buf))) != EOF)
604 if (buf[0] != '-') break;
605
606 if (buf[0]) {
607 /* Store the name into malloced memory. */
608 p->argv1 = (char *)xmalloc(f + 1);
609 strcpy(p->argv1, buf);
610
611 /* Get a pointer to the basename. */
612 p->argv1base = strrchr(p->argv1, '/');
613 if (p->argv1base != NULL)
614 p->argv1base++;
615 else
616 p->argv1base = p->argv1;
617 }
618
619 fclose(fp);
620
621 } else {
622 /* Process disappeared.. */
40fc1ac0
DWF
623 if (p->argv0) free(p->argv0);
624 if (p->argv1) free(p->argv1);
625 if (p->statname) free(p->statname);
c5ae561e 626 free(p->pathname);
a74aeac6
PR
627 free(p);
628 continue;
629 }
630
631 /* Try to stat the executable. */
632 snprintf(path, sizeof(path), "/proc/%s/exe", d->d_name);
40fc1ac0
DWF
633
634 p->nfs = 0;
635
636 switch (do_stat) {
637 case DO_NETFS:
638 if ((p->nfs = check4nfs(path, buf)))
aef3f4ec 639 goto link;
40fc1ac0 640 case DO_STAT:
7e088ce6
DWF
641 if (stat(path, &st) != 0) {
642 char * ptr;
643
644 len = readlink(path, buf, PATH_MAX);
645 if (len <= 0)
646 break;
647 buf[len] = '\0';
648
649 ptr = strstr(buf, " (deleted)");
650 if (!ptr)
651 break;
652 *ptr = '\0';
653 len -= strlen(" (deleted)");
654
655 if (stat(buf, &st) != 0)
656 break;
657 p->dev = st.st_dev;
658 p->ino = st.st_ino;
659 p->pathname = (char *)xmalloc(len + 1);
660 memcpy(p->pathname, buf, len);
661 p->pathname[len] = '\0';
662
663 /* All done */
40fc1ac0 664 break;
7e088ce6
DWF
665 }
666
a74aeac6
PR
667 p->dev = st.st_dev;
668 p->ino = st.st_ino;
aef3f4ec
DWF
669
670 /* Fall through */
40fc1ac0 671 default:
aef3f4ec
DWF
672 link:
673 len = readlink(path, buf, PATH_MAX);
674 if (len > 0) {
675 p->pathname = (char *)xmalloc(len + 1);
676 memcpy(p->pathname, buf, len);
677 p->pathname[len] = '\0';
678 }
40fc1ac0 679 break;
a74aeac6
PR
680 }
681
682 /* Link it into the list. */
683 p->next = plist;
684 plist = p;
685 p->pid = pid;
686 }
687 closedir(dir);
688
689 /* Done. */
690 return 0;
691}
692
693PIDQ_HEAD *init_pid_q(PIDQ_HEAD *q)
694{
695 q->head = q->next = q->tail = NULL;
696 return q;
697}
698
699int empty_q(PIDQ_HEAD *q)
700{
701 return (q->head == NULL);
702}
703
704int add_pid_to_q(PIDQ_HEAD *q, PROC *p)
705{
706 PIDQ *tmp;
707
708 tmp = (PIDQ *)xmalloc(sizeof(PIDQ));
709
710 tmp->proc = p;
711 tmp->next = NULL;
712
713 if (empty_q(q)) {
714 q->head = tmp;
715 q->tail = tmp;
716 } else {
717 q->tail->next = tmp;
718 q->tail = tmp;
719 }
720 return 0;
721}
722
723PROC *get_next_from_pid_q(PIDQ_HEAD *q)
724{
725 PROC *p;
726 PIDQ *tmp = q->head;
727
728 if (!empty_q(q)) {
729 p = q->head->proc;
730 q->head = tmp->next;
731 free(tmp);
732 return p;
733 }
734
735 return NULL;
736}
737
738/* Try to get the process ID of a given process. */
739PIDQ_HEAD *pidof(char *prog)
740{
741 PROC *p;
742 PIDQ_HEAD *q;
743 struct stat st;
744 char *s;
40fc1ac0 745 int nfs = 0;
a74aeac6
PR
746 int dostat = 0;
747 int foundone = 0;
748 int ok = 0;
aef3f4ec 749 const int root = (getuid() == 0);
40fc1ac0 750 char real[PATH_MAX+1];
a74aeac6
PR
751
752 if (! prog)
753 return NULL;
754
40fc1ac0
DWF
755 /* Try to stat the executable. */
756 if (prog[0] == '/') {
757 memset(&real[0], 0, sizeof(real));
758
759 if (check4nfs(prog, real))
760 nfs++;
761
762 if (real[0] != '\0')
763 prog = &real[0]; /* Binary located on network FS. */
764
765 if ((nfs == 0) && (stat(prog, &st) == 0))
766 dostat++; /* Binary located on a local FS. */
767 }
768
a74aeac6
PR
769 /* Get basename of program. */
770 if ((s = strrchr(prog, '/')) == NULL)
771 s = prog;
772 else
773 s++;
774
775 if (! *s)
776 return NULL;
777
778 q = (PIDQ_HEAD *)xmalloc(sizeof(PIDQ_HEAD));
779 q = init_pid_q(q);
780
a74aeac6 781 /* First try to find a match based on dev/ino pair. */
40fc1ac0 782 if (dostat && !nfs) {
a74aeac6 783 for (p = plist; p; p = p->next) {
40fc1ac0
DWF
784 if (p->nfs)
785 continue;
a74aeac6
PR
786 if (p->dev == st.st_dev && p->ino == st.st_ino) {
787 add_pid_to_q(q, p);
788 foundone++;
789 }
790 }
791 }
792
40fc1ac0
DWF
793 /* Second try to find a match based on full path name on
794 * network FS located binaries */
795 if (!foundone && nfs) {
796 for (p = plist; p; p = p->next) {
aef3f4ec
DWF
797 if (!p->pathname)
798 continue;
accef4ed
DWF
799 if (!p->nfs)
800 continue;
aef3f4ec 801 if (strcmp(prog, p->pathname) != 0)
40fc1ac0
DWF
802 continue;
803 add_pid_to_q(q, p);
804 foundone++;
805 }
806 }
807
a74aeac6
PR
808 /* If we didn't find a match based on dev/ino, try the name. */
809 if (!foundone) for (p = plist; p; p = p->next) {
c5ae561e 810 if (prog[0] == '/') {
aef3f4ec
DWF
811 if (!p->pathname) {
812 if (root)
813 continue;
814 goto fallback;
815 }
c5ae561e
DWF
816 if (strcmp(prog, p->pathname)) {
817 int len = strlen(prog);
818 if (strncmp(prog, p->pathname, len))
aef3f4ec
DWF
819 {
820 if (scripts_too)
821 goto fallback;
c5ae561e 822 continue;
aef3f4ec 823 }
c5ae561e 824 if (strcmp(" (deleted)", p->pathname + len))
aef3f4ec
DWF
825 {
826 if (scripts_too)
827 goto fallback;
c5ae561e 828 continue;
aef3f4ec 829 }
c5ae561e
DWF
830 }
831 add_pid_to_q(q, p);
832 continue;
833 }
834
aef3f4ec 835 fallback:
a74aeac6
PR
836 ok = 0;
837
838 /* matching nonmatching
839 * proc name prog name prog name
840 * --- ----------- ------------
841 * b b, p/b, q/b
842 * p/b b, p/b q/b
843 *
844 * Algorithm: Match if:
845 * cmd = arg
846 * or cmd = base(arg)
847 * or base(cmd) = arg
848 *
849 * Specifically, do not match just because base(cmd) = base(arg)
850 * as was done in earlier versions of this program, since this
851 * allows /aaa/foo to match /bbb/foo .
852 */
853 ok |=
854 (p->argv0 && strcmp(p->argv0, prog) == 0)
855 || (p->argv0 && s != prog && strcmp(p->argv0, s) == 0)
856 || (p->argv0base && strcmp(p->argv0base, prog) == 0);
857
858 /* For scripts, compare argv[1] as well. */
859 if (
860 scripts_too && p->statname && p->argv1base
861 && !strncmp(p->statname, p->argv1base, STATNAMELEN)
862 ) {
863 ok |=
864 (p->argv1 && strcmp(p->argv1, prog) == 0)
865 || (p->argv1 && s != prog && strcmp(p->argv1, s) == 0)
866 || (p->argv1base && strcmp(p->argv1base, prog) == 0);
867 }
868
869 /*
870 * if we have a space in argv0, process probably
871 * used setproctitle so try statname.
872 */
873 if (strlen(s) <= STATNAMELEN &&
874 (p->argv0 == NULL ||
875 p->argv0[0] == 0 ||
876 strchr(p->argv0, ' '))) {
877 ok |= (strcmp(p->statname, s) == 0);
878 }
40fc1ac0
DWF
879
880 /*
881 * if we have a `-' as the first character, process
882 * probably used as a login shell
883 */
884 if (strlen(s) <= STATNAMELEN &&
885 p->argv1 == NULL &&
886 (p->argv0 != NULL &&
887 p->argv0[0] == '-')) {
888 ok |= (strcmp(p->statname, s) == 0);
889 }
890
a74aeac6
PR
891 if (ok) add_pid_to_q(q, p);
892 }
893
40fc1ac0 894 return q;
a74aeac6
PR
895}
896
897/* Give usage message and exit. */
898void usage(void)
899{
900 nsyslog(LOG_ERR, "only one argument, a signal number, allowed");
901 closelog();
902 exit(1);
903}
904
905/* write to syslog file if not open terminal */
906#ifdef __GNUC__
907__attribute__ ((format (printf, 2, 3)))
908#endif
909void nsyslog(int pri, char *fmt, ...)
910{
911 va_list args;
912
913 va_start(args, fmt);
914
915 if (ttyname(0) == NULL) {
916 vsyslog(pri, fmt, args);
917 } else {
918 fprintf(stderr, "%s: ",progname);
919 vfprintf(stderr, fmt, args);
920 fprintf(stderr, "\n");
921 }
922
923 va_end(args);
924}
925
926#define PIDOF_SINGLE 0x01
927#define PIDOF_OMIT 0x02
40fc1ac0 928#define PIDOF_NETFS 0x04
a74aeac6
PR
929
930/*
931 * Pidof functionality.
932 */
933int main_pidof(int argc, char **argv)
934{
935 PIDQ_HEAD *q;
936 PROC *p;
40fc1ac0 937 char *token, *here;
a74aeac6
PR
938 int f;
939 int first = 1;
40fc1ac0 940 int opt, flags = 0;
a74aeac6
PR
941 int chroot_check = 0;
942 struct stat st;
943 char tmp[512];
944
40fc1ac0
DWF
945 omit = (OMIT*)0;
946 nlist = (NFS*)0;
a74aeac6
PR
947 opterr = 0;
948
40fc1ac0
DWF
949 if ((token = getenv("PIDOF_NETFS")) && (strcmp(token,"no") != 0))
950 flags |= PIDOF_NETFS;
951
952 while ((opt = getopt(argc,argv,"hco:sxn")) != EOF) switch (opt) {
a74aeac6
PR
953 case '?':
954 nsyslog(LOG_ERR,"invalid options on command line!\n");
955 closelog();
956 exit(1);
957 case 'c':
958 if (geteuid() == 0) chroot_check = 1;
959 break;
960 case 'o':
40fc1ac0
DWF
961 here = optarg;
962 while ((token = strsep(&here, ",;:"))) {
963 OMIT *restrict optr;
964 pid_t opid;
965
966 if (strcmp("%PPID", token) == 0)
967 opid = getppid();
968 else
969 opid = (pid_t)atoi(token);
970
971 if (opid < 1) {
972 nsyslog(LOG_ERR,
973 "illegal omit pid value "
974 "(%s)!\n", token);
975 continue;
976 }
977 xmemalign((void*)&optr, sizeof(void*), alignof(OMIT));
978 optr->next = omit;
979 optr->prev = (OMIT*)0;
980 optr->pid = opid;
981 omit = optr;
a74aeac6 982 }
a74aeac6
PR
983 flags |= PIDOF_OMIT;
984 break;
985 case 's':
986 flags |= PIDOF_SINGLE;
987 break;
988 case 'x':
989 scripts_too++;
990 break;
40fc1ac0
DWF
991 case 'n':
992 flags |= PIDOF_NETFS;
993 break;
a74aeac6
PR
994 default:
995 /* Nothing */
996 break;
997 }
998 argc -= optind;
999 argv += optind;
1000
1001 /* Check if we are in a chroot */
1002 if (chroot_check) {
1003 snprintf(tmp, 512, "/proc/%d/root", getpid());
1004 if (stat(tmp, &st) < 0) {
1005 nsyslog(LOG_ERR, "stat failed for %s!\n", tmp);
1006 closelog();
1007 exit(1);
1008 }
1009 }
1010
40fc1ac0
DWF
1011 if (flags & PIDOF_NETFS)
1012 init_nfs(); /* Which network based FS are online? */
1013
a74aeac6 1014 /* Print out process-ID's one by one. */
40fc1ac0
DWF
1015 readproc((flags & PIDOF_NETFS) ? DO_NETFS : DO_STAT);
1016
a74aeac6
PR
1017 for(f = 0; f < argc; f++) {
1018 if ((q = pidof(argv[f])) != NULL) {
40fc1ac0 1019 pid_t spid = 0;
a74aeac6 1020 while ((p = get_next_from_pid_q(q))) {
40fc1ac0
DWF
1021 if ((flags & PIDOF_OMIT) && omit) {
1022 OMIT * optr;
1023 for (optr = omit; optr; optr = optr->next) {
1024 if (optr->pid == p->pid)
a74aeac6 1025 break;
40fc1ac0
DWF
1026 }
1027
a74aeac6
PR
1028 /*
1029 * On a match, continue with
1030 * the for loop above.
1031 */
40fc1ac0 1032 if (optr)
a74aeac6
PR
1033 continue;
1034 }
1035 if (flags & PIDOF_SINGLE) {
1036 if (spid)
1037 continue;
1038 else
1039 spid = 1;
1040 }
1041 if (chroot_check) {
1042 struct stat st2;
1043 snprintf(tmp, 512, "/proc/%d/root",
1044 p->pid);
1045 if (stat(tmp, &st2) < 0 ||
1046 st.st_dev != st2.st_dev ||
1047 st.st_ino != st2.st_ino) {
1048 continue;
1049 }
1050 }
1051 if (!first)
1052 printf(" ");
1053 printf("%d", p->pid);
1054 first = 0;
1055 }
1056 }
1057 }
1058 if (!first)
1059 printf("\n");
40fc1ac0
DWF
1060
1061 clear_mnt();
1062
a74aeac6
PR
1063 closelog();
1064 return(first ? 1 : 0);
1065}
1066
a74aeac6
PR
1067/* Main for either killall or pidof. */
1068int main(int argc, char **argv)
1069{
1070 PROC *p;
1071 int pid, sid = -1;
a74aeac6 1072 int sig = SIGKILL;
40fc1ac0 1073 int c;
a74aeac6
PR
1074
1075 /* return non-zero if no process was killed */
1076 int retval = 2;
1077
1078 /* Get program name. */
1079 if ((progname = strrchr(argv[0], '/')) == NULL)
1080 progname = argv[0];
1081 else
1082 progname++;
1083
1084 /* Now connect to syslog. */
1085 openlog(progname, LOG_CONS|LOG_PID, LOG_DAEMON);
1086
1087 /* Were we called as 'pidof' ? */
1088 if (strcmp(progname, "pidof") == 0)
1089 return main_pidof(argc, argv);
1090
1091 /* Right, so we are "killall". */
40fc1ac0 1092 omit = (OMIT*)0;
a74aeac6
PR
1093
1094 if (argc > 1) {
40fc1ac0
DWF
1095 for (c = 1; c < argc; c++) {
1096 if (argv[c][0] == '-') (argv[c])++;
1097 if (argv[c][0] == 'o') {
1098 char * token, * here;
1099
1100 if (++c >= argc)
1101 usage();
1102
1103 here = argv[c];
1104 while ((token = strsep(&here, ",;:"))) {
1105 OMIT *restrict optr;
1106 pid_t opid = (pid_t)atoi(token);
1107
1108 if (opid < 1) {
1109 nsyslog(LOG_ERR,
1110 "illegal omit pid value "
1111 "(%s)!\n", token);
1112 continue;
1113 }
1114 xmemalign((void*)&optr, sizeof(void*), alignof(OMIT));
1115 optr->next = omit;
1116 optr->prev = (OMIT*)0;
1117 optr->pid = opid;
1118 omit = optr;
a74aeac6 1119 }
a74aeac6
PR
1120 }
1121 else if ((sig = atoi(argv[1])) <= 0 || sig > 31)
1122 usage();
1123 }
1124 }
1125
1126 /* First get the /proc filesystem online. */
1127 mount_proc();
1128
1129 /*
1130 * Ignoring SIGKILL and SIGSTOP do not make sense, but
1131 * someday kill(-1, sig) might kill ourself if we don't
1132 * do this. This certainly is a valid concern for SIGTERM-
1133 * Linux 2.1 might send the calling process the signal too.
1134 */
1135 signal(SIGTERM, SIG_IGN);
1136 signal(SIGSTOP, SIG_IGN);
1137 signal(SIGKILL, SIG_IGN);
1138
1139 /* lock us into memory */
1140 mlockall(MCL_CURRENT | MCL_FUTURE);
1141
1142 /* Now stop all processes. */
1143 kill(-1, SIGSTOP);
1144 sent_sigstop = 1;
1145
1146 /* Read /proc filesystem */
1147 if (readproc(NO_STAT) < 0) {
1148 kill(-1, SIGCONT);
1149 return(1);
1150 }
1151
1152 /* Now kill all processes except init (pid 1) and our session. */
1153 sid = (int)getsid(0);
1154 pid = (int)getpid();
1155 for (p = plist; p; p = p->next) {
1156 if (p->pid == 1 || p->pid == pid || p->sid == sid || p->kernel)
1157 continue;
40fc1ac0 1158
a74aeac6 1159 if (omit) {
40fc1ac0
DWF
1160 OMIT * optr;
1161 for (optr = omit; optr; optr = optr->next) {
1162 if (optr->pid == p->pid)
a74aeac6 1163 break;
40fc1ac0
DWF
1164 }
1165
a74aeac6 1166 /* On a match, continue with the for loop above. */
40fc1ac0 1167 if (optr)
a74aeac6
PR
1168 continue;
1169 }
40fc1ac0 1170
a74aeac6
PR
1171 kill(p->pid, sig);
1172 retval = 0;
1173 }
1174
1175 /* And let them continue. */
1176 kill(-1, SIGCONT);
1177
1178 /* Done. */
1179 closelog();
1180
1181 /* Force the kernel to run the scheduler */
1182 usleep(1);
1183
1184 return retval;
1185}