killall.c revision 76169 
1/*-
2 * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
3 * Copyright (c) 2000 Paul Saab <ps@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: head/usr.bin/killall/killall.c 76169 2001-05-01 08:46:02Z markm $
28 */
29
30#include <sys/cdefs.h>
31#include <sys/param.h>
32#include <sys/lock.h>
33#include <sys/stat.h>
34#include <sys/user.h>
35#include <sys/sysctl.h>
36#include <fcntl.h>
37#include <dirent.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <pwd.h>
42#include <signal.h>
43#include <regex.h>
44#include <ctype.h>
45#include <err.h>
46#include <errno.h>
47#include <unistd.h>
48
49static char	*prog;
50
51static void __dead2
52usage(void)
53{
54
55	fprintf(stderr, "usage: %s [-l] [-v] [-m] [-sig] [-u user] [-t tty] [-c cmd] [cmd]...\n", prog);
56	fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
57	exit(1);
58}
59
60static char *
61upper(const char *str)
62{
63	static char buf[80];
64	char *s;
65
66	strncpy(buf, str, sizeof(buf));
67	buf[sizeof(buf) - 1] = '\0';
68	for (s = buf; *s; s++)
69		*s = toupper(*s);
70	return buf;
71}
72
73
74static void
75printsig(FILE *fp)
76{
77	const char	*const * p;
78	int		cnt;
79	int		offset = 0;
80
81	for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
82		offset += fprintf(fp, "%s ", upper(*p));
83		if (offset >= 75 && cnt > 1) {
84			offset = 0;
85			fprintf(fp, "\n");
86		}
87	}
88	fprintf(fp, "\n");
89}
90
91static void
92nosig(char *name)
93{
94
95	warnx("unknown signal %s; valid signals:", name);
96	printsig(stderr);
97	exit(1);
98}
99
100int
101main(int ac, char **av)
102{
103	struct kinfo_proc *procs = NULL, *newprocs;
104	struct stat	sb;
105	struct passwd	*pw;
106	regex_t		rgx;
107	regmatch_t	pmatch;
108	int		i, j;
109	char		buf[256];
110	char		*user = NULL;
111	char		*tty = NULL;
112	char		*cmd = NULL;
113	int		vflag = 0;
114	int		sflag = 0;
115	int		dflag = 0;
116	int		mflag = 0;
117	uid_t		uid = 0;
118	dev_t		tdev = 0;
119	char		thiscmd[MAXCOMLEN + 1];
120	pid_t		thispid;
121	uid_t		thisuid;
122	dev_t		thistdev;
123	int		sig = SIGTERM;
124	const char *const *p;
125	char		*ep;
126	int		errors = 0;
127	int		mib[3];
128	size_t		miblen;
129	int		st, nprocs;
130	size_t		size;
131	int		matched;
132	int		killed = 0;
133
134	prog = av[0];
135	av++;
136	ac--;
137
138	while (ac > 0) {
139		if (strcmp(*av, "-l") == 0) {
140			printsig(stdout);
141			exit(0);
142		}
143		if (strcmp(*av, "-help") == 0)
144			usage();
145		if (**av == '-') {
146			++*av;
147			switch (**av) {
148			case 'u':
149				++*av;
150				if (**av == '\0')
151					++av;
152				--ac;
153				user = *av;
154				break;
155			case 't':
156				++*av;
157				if (**av == '\0')
158					++av;
159				--ac;
160				tty = *av;
161				break;
162			case 'c':
163				++*av;
164				if (**av == '\0')
165					++av;
166				--ac;
167				cmd = *av;
168				break;
169			case 'v':
170				vflag++;
171				break;
172			case 's':
173				sflag++;
174				break;
175			case 'd':
176				dflag++;
177				break;
178			case 'm':
179				mflag++;
180				break;
181			default:
182				if (isalpha(**av)) {
183					if (strncasecmp(*av, "sig", 3) == 0)
184						*av += 3;
185					for (sig = NSIG, p = sys_signame + 1;
186					     --sig; ++p)
187						if (strcasecmp(*p, *av) == 0) {
188							sig = p - sys_signame;
189							break;
190						}
191					if (!sig)
192						nosig(*av);
193				} else if (isdigit(**av)) {
194					sig = strtol(*av, &ep, 10);
195					if (!*av || *ep)
196						errx(1, "illegal signal number: %s", *av);
197					if (sig < 0 || sig > NSIG)
198						nosig(*av);
199				} else
200					nosig(*av);
201			}
202			++av;
203			--ac;
204		} else {
205			break;
206		}
207	}
208
209	if (user == NULL && tty == NULL && cmd == NULL && ac == 0)
210		usage();
211
212	if (tty) {
213		if (strncmp(tty, "/dev/", 5) == 0)
214			snprintf(buf, sizeof(buf), "%s", tty);
215		else if (strncmp(tty, "tty", 3) == 0)
216			snprintf(buf, sizeof(buf), "/dev/%s", tty);
217		else
218			snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
219		if (stat(buf, &sb) < 0)
220			err(1, "stat(%s)", buf);
221		if (!S_ISCHR(sb.st_mode))
222			errx(1, "%s: not a character device", buf);
223		tdev = sb.st_rdev;
224		if (dflag)
225			printf("ttydev:0x%x\n", tdev);
226	}
227	if (user) {
228		pw = getpwnam(user);
229		if (pw == NULL)
230			errx(1, "user %s does not exist", user);
231		uid = pw->pw_uid;
232		if (dflag)
233			printf("uid:%d\n", uid);
234	} else {
235		uid = getuid();
236		if (uid != 0) {
237			pw = getpwuid(uid);
238			if (pw)
239				user = pw->pw_name;
240			if (dflag)
241				printf("uid:%d\n", uid);
242		}
243	}
244	size = 0;
245	mib[0] = CTL_KERN;
246	mib[1] = KERN_PROC;
247	mib[2] = KERN_PROC_ALL;
248	mib[3] = 0;
249	miblen = 3;
250
251	if (user && mib[2] == KERN_PROC_ALL) {
252		mib[2] = KERN_PROC_RUID;
253		mib[3] = uid;
254		miblen = 4;
255	}
256	if (tty && mib[2] == KERN_PROC_ALL) {
257		mib[2] = KERN_PROC_TTY;
258		mib[3] = tdev;
259		miblen = 4;
260	}
261
262	st = sysctl(mib, miblen, NULL, &size, NULL, 0);
263	do {
264		size += size / 10;
265		newprocs = realloc(procs, size);
266		if (newprocs == 0) {
267			if (procs)
268				free(procs);
269			errx(1, "could not reallocate memory");
270		}
271		procs = newprocs;
272		st = sysctl(mib, miblen, procs, &size, NULL, 0);
273	} while (st == -1 && errno == ENOMEM);
274	if (st == -1)
275		err(1, "could not sysctl(KERN_PROC)");
276	if (size % sizeof(struct kinfo_proc) != 0) {
277		fprintf(stderr, "proc size mismatch (%d total, %d chunks)\n",
278			size, sizeof(struct kinfo_proc));
279		fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
280		exit(1);
281	}
282	nprocs = size / sizeof(struct kinfo_proc);
283	if (dflag)
284		printf("nprocs %d\n", nprocs);
285
286	for (i = 0; i < nprocs; i++) {
287		thispid = procs[i].ki_pid;
288		strncpy(thiscmd, procs[i].ki_comm, MAXCOMLEN);
289		thiscmd[MAXCOMLEN] = '\0';
290		thistdev = procs[i].ki_tdev;
291		thisuid = procs[i].ki_ruid;	/* real uid */
292
293		matched = 1;
294		if (user) {
295			if (thisuid != uid)
296				matched = 0;
297		}
298		if (tty) {
299			if (thistdev != tdev)
300				matched = 0;
301		}
302		if (cmd) {
303			if (mflag) {
304				if (regcomp(&rgx, cmd,
305				    REG_EXTENDED|REG_NOSUB) != 0) {
306					mflag = 0;
307					warnx("%s: illegal regexp", cmd);
308				}
309			}
310			if (mflag) {
311				pmatch.rm_so = 0;
312				pmatch.rm_eo = strlen(thiscmd);
313				if (regexec(&rgx, thiscmd, 0, &pmatch,
314				    REG_STARTEND) != 0)
315					matched = 0;
316				regfree(&rgx);
317			} else {
318				if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
319					matched = 0;
320			}
321		}
322		if (matched == 0)
323			continue;
324		if (ac > 0)
325			matched = 0;
326		for (j = 0; j < ac; j++) {
327			if (mflag) {
328				if (regcomp(&rgx, av[j],
329				    REG_EXTENDED|REG_NOSUB) != 0) {
330					mflag = 0;
331					warnx("%s: illegal regexp", av[j]);
332				}
333			}
334			if (mflag) {
335				pmatch.rm_so = 0;
336				pmatch.rm_eo = strlen(thiscmd);
337				if (regexec(&rgx, thiscmd, 0, &pmatch,
338				    REG_STARTEND) == 0)
339					matched = 1;
340				regfree(&rgx);
341			} else {
342				if (strcmp(thiscmd, av[j]) == 0)
343					matched = 1;
344			}
345			if (matched)
346				break;
347		}
348		if (matched == 0)
349			continue;
350		if (dflag)
351			printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
352			    thiscmd, thispid, thistdev, thisuid);
353
354		if (vflag || sflag)
355			printf("kill -%s %d\n", upper(sys_signame[sig]),
356			    thispid);
357
358		killed++;
359		if (!dflag && !sflag) {
360			if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
361				warn("kill -%s %d", upper(sys_signame[sig]),
362				    thispid);
363				errors = 1;
364			}
365		}
366	}
367	if (killed == 0) {
368		fprintf(stderr, "No matching processes %swere found\n",
369		    getuid() != 0 ? "belonging to you " : "");
370		errors = 1;
371	}
372	exit(errors);
373}
374