xref: /dragonfly/usr.bin/killall/killall.c (revision c9f721c2) 
1 /*-
2  * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
3  * Copyright (c) 2000 Paul Saab <ps@FreeBSD.org>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD: src/usr.bin/killall/killall.c,v 1.5.2.4 2001/05/19 19:22:49 phk Exp $
28  * $DragonFly: src/usr.bin/killall/killall.c,v 1.7 2004/09/14 00:33:53 drhodus Exp $
29  */
30 
31 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <sys/stat.h>
34 #include <sys/user.h>
35 #include <sys/sysctl.h>
36 #include <fcntl.h>
37 #include <dirent.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <pwd.h>
42 #include <signal.h>
43 #include <regex.h>
44 #include <ctype.h>
45 #include <err.h>
46 #include <errno.h>
47 #include <unistd.h>
48 
49 static char	*prog;
50 
51 static void __dead2
52 usage(void)
53 {
54 
55 	fprintf(stderr, "usage: %s [-l] [-v] [-m] [-sig] [-u user] [-t tty] [-c cmd] [cmd]...\n", prog);
56 	fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
57 	exit(1);
58 }
59 
60 static char *
61 upper(const char *str)
62 {
63 	static char buf[80];
64 	char *s;
65 
66 	strlcpy(buf, str, sizeof(buf));
67 	for (s = buf; *s; s++)
68 		*s = toupper((unsigned char)*s);
69 	return buf;
70 }
71 
72 
73 static void
74 printsig(FILE *fp)
75 {
76 	const char	*const * p;
77 	int		cnt;
78 	int		offset = 0;
79 
80 	for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
81 		offset += fprintf(fp, "%s ", upper(*p));
82 		if (offset >= 75 && cnt > 1) {
83 			offset = 0;
84 			fprintf(fp, "\n");
85 		}
86 	}
87 	fprintf(fp, "\n");
88 }
89 
90 static void
91 nosig(char *name)
92 {
93 
94 	warnx("unknown signal %s; valid signals:", name);
95 	printsig(stderr);
96 	exit(1);
97 }
98 
99 int
100 main(int ac, char **av)
101 {
102 	struct kinfo_proc *procs = NULL, *newprocs;
103 	struct stat	sb;
104 	struct passwd	*pw;
105 	regex_t		rgx;
106 	regmatch_t	pmatch;
107 	int		i, j;
108 	char		buf[256];
109 	char		*user = NULL;
110 	char		*tty = NULL;
111 	char		*cmd = NULL;
112 	int		qflag = 0;
113 	int		vflag = 0;
114 	int		sflag = 0;
115 	int		dflag = 0;
116 	int		mflag = 0;
117 	uid_t		uid = 0;
118 	dev_t		tdev = 0;
119 	pid_t		mypid;
120 	char		thiscmd[MAXCOMLEN + 1];
121 	pid_t		thispid;
122 	uid_t		thisuid;
123 	dev_t		thistdev;
124 	int		sig = SIGTERM;
125 	const char *const *p;
126 	char		*ep;
127 	int		errors = 0;
128 	int		mib[4];
129 	size_t		miblen;
130 	int		st, nprocs;
131 	size_t		size;
132 	int		matched;
133 	int		killed = 0;
134 
135 	prog = av[0];
136 	av++;
137 	ac--;
138 
139 	while (ac > 0) {
140 		if (strcmp(*av, "-l") == 0) {
141 			printsig(stdout);
142 			exit(0);
143 		}
144 		if (strcmp(*av, "-help") == 0)
145 			usage();
146 		if (**av == '-') {
147 			++*av;
148 			switch (**av) {
149 			case 'u':
150 				++*av;
151 				if (**av == '\0')
152 					++av;
153 				--ac;
154 				user = *av;
155 				break;
156 			case 't':
157 				++*av;
158 				if (**av == '\0')
159 					++av;
160 				--ac;
161 				tty = *av;
162 				break;
163 			case 'c':
164 				++*av;
165 				if (**av == '\0')
166 					++av;
167 				--ac;
168 				cmd = *av;
169 				break;
170 			case 'q':
171 				qflag++;
172 				break;
173 			case 'v':
174 				vflag++;
175 				break;
176 			case 's':
177 				sflag++;
178 				break;
179 			case 'd':
180 				dflag++;
181 				break;
182 			case 'm':
183 				mflag++;
184 				break;
185 			default:
186 				if (isalpha((unsigned char)**av)) {
187 					if (strncasecmp(*av, "sig", 3) == 0)
188 						*av += 3;
189 					for (sig = NSIG, p = sys_signame + 1;
190 					     --sig; ++p)
191 						if (strcasecmp(*p, *av) == 0) {
192 							sig = p - sys_signame;
193 							break;
194 						}
195 					if (!sig)
196 						nosig(*av);
197 				} else if (isdigit((unsigned char)**av)) {
198 					sig = strtol(*av, &ep, 10);
199 					if (!*av || *ep)
200 						errx(1, "illegal signal number: %s", *av);
201 					if (sig < 0 || sig >= NSIG)
202 						nosig(*av);
203 				} else
204 					nosig(*av);
205 			}
206 			++av;
207 			--ac;
208 		} else {
209 			break;
210 		}
211 	}
212 
213 	if (user == NULL && tty == NULL && cmd == NULL && ac == 0)
214 		usage();
215 
216 	if (tty) {
217 		if (strncmp(tty, "/dev/", 5) == 0)
218 			snprintf(buf, sizeof(buf), "%s", tty);
219 		else if (strncmp(tty, "tty", 3) == 0)
220 			snprintf(buf, sizeof(buf), "/dev/%s", tty);
221 		else
222 			snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
223 		if (stat(buf, &sb) < 0)
224 			err(1, "stat(%s)", buf);
225 		if (!S_ISCHR(sb.st_mode))
226 			errx(1, "%s: not a character device", buf);
227 		tdev = sb.st_rdev;
228 		if (dflag)
229 			printf("ttydev:0x%x\n", tdev);
230 	}
231 	if (user) {
232 		pw = getpwnam(user);
233 		if (pw == NULL)
234 			errx(1, "user %s does not exist", user);
235 		uid = pw->pw_uid;
236 		if (dflag)
237 			printf("uid:%d\n", uid);
238 	} else {
239 		uid = getuid();
240 		if (uid != 0) {
241 			pw = getpwuid(uid);
242 			if (pw)
243 				user = pw->pw_name;
244 			if (dflag)
245 				printf("uid:%d\n", uid);
246 		}
247 	}
248 	size = 0;
249 	mib[0] = CTL_KERN;
250 	mib[1] = KERN_PROC;
251 	mib[2] = KERN_PROC_ALL;
252 	mib[3] = 0;
253 	miblen = 3;
254 
255 	if (user && mib[2] == KERN_PROC_ALL) {
256 		mib[2] = KERN_PROC_RUID;
257 		mib[3] = uid;
258 		miblen = 4;
259 	}
260 	if (tty && mib[2] == KERN_PROC_ALL) {
261 		mib[2] = KERN_PROC_TTY;
262 		mib[3] = tdev;
263 		miblen = 4;
264 	}
265 
266 	st = sysctl(mib, miblen, NULL, &size, NULL, 0);
267 	do {
268 		size += size / 10;
269 		newprocs = realloc(procs, size);
270 		if (newprocs == 0) {
271 			if (procs)
272 				free(procs);
273 			errx(1, "could not reallocate memory");
274 		}
275 		procs = newprocs;
276 		st = sysctl(mib, miblen, procs, &size, NULL, 0);
277 	} while (st == -1 && errno == ENOMEM);
278 	if (st == -1)
279 		err(1, "could not sysctl(KERN_PROC)");
280 	if (size % sizeof(struct kinfo_proc) != 0) {
281 		fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
282 			size, sizeof(struct kinfo_proc));
283 		fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
284 		exit(1);
285 	}
286 	nprocs = size / sizeof(struct kinfo_proc);
287 	if (dflag)
288 		printf("nprocs %d\n", nprocs);
289 	mypid = getpid();
290 
291 	for (i = 0; i < nprocs; i++) {
292 		thispid = procs[i].kp_proc.p_pid;
293 		strncpy(thiscmd, procs[i].kp_thread.td_comm, MAXCOMLEN);
294 		thiscmd[MAXCOMLEN] = '\0';
295 		thistdev = procs[i].kp_eproc.e_tdev;
296 		thisuid = procs[i].kp_eproc.e_ucred.cr_ruid;	/* real uid */
297 
298 		if (thispid == mypid)
299 			continue;
300 		matched = 1;
301 		if ((int)procs[i].kp_proc.p_pid < 0)
302 			matched = 0;
303 		if (user) {
304 			if (thisuid != uid)
305 				matched = 0;
306 		}
307 		if (tty) {
308 			if (thistdev != tdev)
309 				matched = 0;
310 		}
311 		if (cmd) {
312 			if (mflag) {
313 				if (regcomp(&rgx, cmd,
314 				    REG_EXTENDED|REG_NOSUB) != 0) {
315 					mflag = 0;
316 					warnx("%s: illegal regexp", cmd);
317 				}
318 			}
319 			if (mflag) {
320 				pmatch.rm_so = 0;
321 				pmatch.rm_eo = strlen(thiscmd);
322 				if (regexec(&rgx, thiscmd, 0, &pmatch,
323 				    REG_STARTEND) != 0)
324 					matched = 0;
325 				regfree(&rgx);
326 			} else {
327 				if (strcmp(thiscmd, cmd) != 0)
328 					matched = 0;
329 			}
330 		}
331 		if (matched == 0)
332 			continue;
333 		matched = 0;
334 		for (j = 0; j < ac; j++) {
335 			if (mflag) {
336 				if (regcomp(&rgx, av[j],
337 				    REG_EXTENDED|REG_NOSUB) != 0) {
338 					mflag = 0;
339 					warnx("%s: illegal regexp", av[j]);
340 				}
341 			}
342 			if (mflag) {
343 				pmatch.rm_so = 0;
344 				pmatch.rm_eo = strlen(thiscmd);
345 				if (regexec(&rgx, thiscmd, 0, &pmatch,
346 				    REG_STARTEND) == 0)
347 					matched = 1;
348 				regfree(&rgx);
349 			} else {
350 				if (strcmp(thiscmd, av[j]) == 0)
351 					matched = 1;
352 			}
353 			if (matched)
354 				break;
355 		}
356 		if (matched == 0)
357 			continue;
358 		if (dflag)
359 			printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
360 			    thiscmd, thispid, thistdev, thisuid);
361 
362 		if (vflag || sflag)
363 			printf("kill -%s %d\n", upper(sys_signame[sig]),
364 			    thispid);
365 
366 		killed++;
367 		if (!dflag && !sflag) {
368 			if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
369 				warn("kill -%s %d", upper(sys_signame[sig]),
370 				    thispid);
371 				errors = 1;
372 			}
373 		}
374 	}
375 	if (!qflag && killed == 0) {
376 		fprintf(stderr, "No matching processes %swere found\n",
377 		    getuid() != 0 ? "belonging to you " : "");
378 		errors = 1;
379 	}
380 	exit(errors);
381 }
382