xref: /dragonfly/usr.bin/ipcs/ipcs.c (revision 2c603719) 
1 /*
2  * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $FreeBSD: src/usr.bin/ipcs/ipcs.c,v 1.12.2.4 2003/04/08 11:01:34 tjr Exp $
28  * $DragonFly: src/usr.bin/ipcs/ipcs.c,v 1.7 2004/11/02 19:38:49 liamfoy Exp $
29  */
30 
31 #define _KERNEL_STRUCTURES
32 
33 #include <err.h>
34 #include <fcntl.h>
35 #include <grp.h>
36 #include <kvm.h>
37 #include <nlist.h>
38 #include <paths.h>
39 #include <pwd.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44 
45 #include <sys/types.h>
46 #include <sys/param.h>
47 #include <sys/time.h>
48 #include <sys/ipc.h>
49 #include <sys/sem.h>
50 #include <sys/shm.h>
51 #include <sys/msg.h>
52 
53 struct semid_ds	*sema;
54 struct seminfo	seminfo;
55 struct msginfo	msginfo;
56 struct msqid_ds	*msqids;
57 struct shminfo	shminfo;
58 struct shmid_ds	*shmsegs;
59 
60 static void	usage(void);
61 static uid_t	user2uid(const char *);
62 static gid_t	grp2gid(const char *);
63 
64 static struct nlist symbols[] = {
65 	{"_sema"},
66 #define X_SEMA		0
67 	{"_seminfo"},
68 #define X_SEMINFO	1
69 	{"_semu"},
70 #define X_SEMU		2
71 	{"_msginfo"},
72 #define X_MSGINFO	3
73 	{"_msqids"},
74 #define X_MSQIDS	4
75 	{"_shminfo"},
76 #define X_SHMINFO	5
77 	{"_shmsegs"},
78 #define X_SHMSEGS	6
79 	{NULL}
80 };
81 
82 static kvm_t *kd;
83 
84 char   *
85 fmt_perm(u_short mode)
86 {
87 	static char buffer[100];
88 
89 	buffer[0] = '-';
90 	buffer[1] = '-';
91 	buffer[2] = ((mode & 0400) ? 'r' : '-');
92 	buffer[3] = ((mode & 0200) ? 'w' : '-');
93 	buffer[4] = ((mode & 0100) ? 'a' : '-');
94 	buffer[5] = ((mode & 0040) ? 'r' : '-');
95 	buffer[6] = ((mode & 0020) ? 'w' : '-');
96 	buffer[7] = ((mode & 0010) ? 'a' : '-');
97 	buffer[8] = ((mode & 0004) ? 'r' : '-');
98 	buffer[9] = ((mode & 0002) ? 'w' : '-');
99 	buffer[10] = ((mode & 0001) ? 'a' : '-');
100 	buffer[11] = '\0';
101 	return (&buffer[0]);
102 }
103 
104 void
105 cvt_time(time_t t, char *buf)
106 {
107 	struct tm *tm;
108 
109 	if (t == 0) {
110 		strcpy(buf, "no-entry");
111 	} else {
112 		tm = localtime(&t);
113 		sprintf(buf, "%2d:%02d:%02d",
114 			tm->tm_hour, tm->tm_min, tm->tm_sec);
115 	}
116 }
117 #define	SHMINFO		1
118 #define	SHMTOTAL	2
119 #define	MSGINFO		4
120 #define	MSGTOTAL	8
121 #define	SEMINFO		16
122 #define	SEMTOTAL	32
123 
124 #define BIGGEST		1
125 #define CREATOR		2
126 #define OUTSTANDING	4
127 #define PID		8
128 #define TIME		16
129 
130 int
131 main(int argc, char **argv)
132 {
133 	int     display = SHMINFO | MSGINFO | SEMINFO;
134 	int     option = 0;
135 	char   *core, *namelist;
136 	const char *user, *grp;
137 	int     i;
138 	uid_t	useruid;
139 	gid_t	grpgid;
140 
141 	core = namelist = NULL;
142 
143 	while ((i = getopt(argc, argv, "MmQqSsabC:cN:ou:g:ptT")) != -1)
144 		switch (i) {
145 		case 'M':
146 			display = SHMTOTAL;
147 			break;
148 		case 'm':
149 			display = SHMINFO;
150 			break;
151 		case 'Q':
152 			display = MSGTOTAL;
153 			break;
154 		case 'q':
155 			display = MSGINFO;
156 			break;
157 		case 'S':
158 			display = SEMTOTAL;
159 			break;
160 		case 's':
161 			display = SEMINFO;
162 			break;
163 		case 'T':
164 			display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
165 			break;
166 		case 'a':
167 			option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
168 			break;
169 		case 'b':
170 			option |= BIGGEST;
171 			break;
172 		case 'C':
173 			core = optarg;
174 			break;
175 		case 'c':
176 			option |= CREATOR;
177 			break;
178 		case 'N':
179 			namelist = optarg;
180 			break;
181 		case 'o':
182 			option |= OUTSTANDING;
183 			break;
184 		case 'p':
185 			option |= PID;
186 			break;
187 		case 't':
188 			option |= TIME;
189 			break;
190 		case 'u':
191 			user = optarg;
192 			grp = NULL;
193 			useruid = user2uid(optarg);
194 			break;
195 		case 'g':
196 			grp = optarg;
197 			user = NULL;
198 			grpgid = grp2gid(optarg);
199 			break;
200 		default:
201 			usage();
202 		}
203 
204 	/*
205 	 * Discard setgid privileges if not the running kernel so that bad
206 	 * guys can't print interesting stuff from kernel memory.
207 	 */
208 	if (namelist != NULL || core != NULL)
209 		setgid(getgid());
210 
211 	if ((kd = kvm_open(namelist, core, NULL, O_RDONLY, "ipcs")) == NULL)
212 		exit(1);
213 
214 	switch (kvm_nlist(kd, symbols)) {
215 	case 0:
216 		break;
217 	case -1:
218 		errx(1, "unable to read kernel symbol table");
219 	default:
220 #ifdef notdef		/* they'll be told more civilly later */
221 		warnx("nlist failed");
222 		for (i = 0; symbols[i].n_name != NULL; i++)
223 			if (symbols[i].n_value == 0)
224 				warnx("symbol %s not found",
225 				    symbols[i].n_name);
226 #endif
227 		break;
228 	}
229 
230 	if ((display & (MSGINFO | MSGTOTAL)) &&
231 	    kvm_read(kd, symbols[X_MSGINFO].n_value, &msginfo, sizeof(msginfo))== sizeof(msginfo)) {
232 
233 		if (display & MSGTOTAL) {
234 			printf("msginfo:\n");
235 			printf("\tmsgmax: %6d\t(max characters in a message)\n",
236 			    msginfo.msgmax);
237 			printf("\tmsgmni: %6d\t(# of message queues)\n",
238 			    msginfo.msgmni);
239 			printf("\tmsgmnb: %6d\t(max characters in a message queue)\n",
240 			    msginfo.msgmnb);
241 			printf("\tmsgtql: %6d\t(max # of messages in system)\n",
242 			    msginfo.msgtql);
243 			printf("\tmsgssz: %6d\t(size of a message segment)\n",
244 			    msginfo.msgssz);
245 			printf("\tmsgseg: %6d\t(# of message segments in system)\n\n",
246 			    msginfo.msgseg);
247 		}
248 		if (display & MSGINFO) {
249 			struct msqid_ds *xmsqids;
250 
251 			kvm_read(kd, symbols[X_MSQIDS].n_value, &msqids, sizeof(msqids));
252 			xmsqids = malloc(sizeof(struct msqid_ds) * msginfo.msgmni);
253 			kvm_read(kd, (u_long) msqids, xmsqids, sizeof(struct msqid_ds) * msginfo.msgmni);
254 
255 			printf("Message Queues:\n");
256 			printf("T     ID     KEY        MODE       OWNER    GROUP");
257 			if (option & CREATOR)
258 				printf("  CREATOR   CGROUP");
259 			if (option & OUTSTANDING)
260 				printf(" CBYTES  QNUM");
261 			if (option & BIGGEST)
262 				printf(" QBYTES");
263 			if (option & PID)
264 				printf(" LSPID LRPID");
265 			if (option & TIME)
266 				printf("   STIME    RTIME    CTIME");
267 			printf("\n");
268 			for (i = 0; i < msginfo.msgmni; i += 1) {
269 				if (xmsqids[i].msg_qbytes != 0) {
270 					char    stime_buf[100], rtime_buf[100],
271 					        ctime_buf[100];
272 					struct msqid_ds *msqptr = &xmsqids[i];
273 
274 					if (user && useruid != msqptr->msg_perm.uid)
275 							continue;
276 					if (grp && grpgid != msqptr->msg_perm.gid)
277 							continue;
278 
279 					cvt_time(msqptr->msg_stime, stime_buf);
280 					cvt_time(msqptr->msg_rtime, rtime_buf);
281 					cvt_time(msqptr->msg_ctime, ctime_buf);
282 
283 					printf("q %6d %10d %s %8s %8s",
284 					    IXSEQ_TO_IPCID(i, msqptr->msg_perm),
285 					    msqptr->msg_perm.key,
286 					    fmt_perm(msqptr->msg_perm.mode),
287 					    user_from_uid(msqptr->msg_perm.uid, 0),
288 					    group_from_gid(msqptr->msg_perm.gid, 0));
289 
290 					if (option & CREATOR)
291 						printf(" %8s %8s",
292 						    user_from_uid(msqptr->msg_perm.cuid, 0),
293 						    group_from_gid(msqptr->msg_perm.cgid, 0));
294 
295 					if (option & OUTSTANDING)
296 						printf(" %6d %6d",
297 						    msqptr->msg_cbytes,
298 						    msqptr->msg_qnum);
299 
300 					if (option & BIGGEST)
301 						printf(" %6d",
302 						    msqptr->msg_qbytes);
303 
304 					if (option & PID)
305 						printf(" %6d %6d",
306 						    msqptr->msg_lspid,
307 						    msqptr->msg_lrpid);
308 
309 					if (option & TIME)
310 						printf("%s %s %s",
311 						    stime_buf,
312 						    rtime_buf,
313 						    ctime_buf);
314 
315 					printf("\n");
316 				}
317 			}
318 			printf("\n");
319 		}
320 	} else
321 		if (display & (MSGINFO | MSGTOTAL)) {
322 			fprintf(stderr,
323 			    "SVID messages facility not configured in the system\n");
324 		}
325 	if ((display & (SHMINFO | SHMTOTAL)) &&
326 	    kvm_read(kd, symbols[X_SHMINFO].n_value, &shminfo, sizeof(shminfo))) {
327 		if (display & SHMTOTAL) {
328 			printf("shminfo:\n");
329 			printf("\tshmmax: %7d\t(max shared memory segment size)\n",
330 			    shminfo.shmmax);
331 			printf("\tshmmin: %7d\t(min shared memory segment size)\n",
332 			    shminfo.shmmin);
333 			printf("\tshmmni: %7d\t(max number of shared memory identifiers)\n",
334 			    shminfo.shmmni);
335 			printf("\tshmseg: %7d\t(max shared memory segments per process)\n",
336 			    shminfo.shmseg);
337 			printf("\tshmall: %7d\t(max amount of shared memory in pages)\n\n",
338 			    shminfo.shmall);
339 		}
340 		if (display & SHMINFO) {
341 			struct shmid_ds *xshmids;
342 
343 			kvm_read(kd, symbols[X_SHMSEGS].n_value, &shmsegs, sizeof(shmsegs));
344 			xshmids = malloc(sizeof(struct shmid_ds) * shminfo.shmmni);
345 			kvm_read(kd, (u_long) shmsegs, xshmids, sizeof(struct shmid_ds) *
346 			    shminfo.shmmni);
347 
348 			printf("Shared Memory:\n");
349 			printf("T     ID     KEY        MODE       OWNER    GROUP");
350 			if (option & CREATOR)
351 				printf("  CREATOR   CGROUP");
352 			if (option & OUTSTANDING)
353 				printf(" NATTCH");
354 			if (option & BIGGEST)
355 				printf("  SEGSZ");
356 			if (option & PID)
357 				printf("  CPID  LPID");
358 			if (option & TIME)
359 				printf("   ATIME    DTIME    CTIME");
360 			printf("\n");
361 			for (i = 0; i < shminfo.shmmni; i += 1) {
362 				if (xshmids[i].shm_perm.mode & 0x0800) {
363 					char    atime_buf[100], dtime_buf[100],
364 					        ctime_buf[100];
365 					struct shmid_ds *shmptr = &xshmids[i];
366 
367 					if (user && useruid != shmptr->shm_perm.uid)
368 						continue;
369 
370 					if (grp && grpgid != shmptr->shm_perm.gid)
371 						continue;
372 
373 					cvt_time(shmptr->shm_atime, atime_buf);
374 					cvt_time(shmptr->shm_dtime, dtime_buf);
375 					cvt_time(shmptr->shm_ctime, ctime_buf);
376 
377 					printf("m %6d %10d %s %8s %8s",
378 					    IXSEQ_TO_IPCID(i, shmptr->shm_perm),
379 					    shmptr->shm_perm.key,
380 					    fmt_perm(shmptr->shm_perm.mode),
381 					    user_from_uid(shmptr->shm_perm.uid, 0),
382 					    group_from_gid(shmptr->shm_perm.gid, 0));
383 
384 					if (option & CREATOR)
385 						printf(" %8s %8s",
386 						    user_from_uid(shmptr->shm_perm.cuid, 0),
387 						    group_from_gid(shmptr->shm_perm.cgid, 0));
388 
389 					if (option & OUTSTANDING)
390 						printf(" %6d",
391 						    shmptr->shm_nattch);
392 
393 					if (option & BIGGEST)
394 						printf(" %6d",
395 						    shmptr->shm_segsz);
396 
397 					if (option & PID)
398 						printf(" %6d %6d",
399 						    shmptr->shm_cpid,
400 						    shmptr->shm_lpid);
401 
402 					if (option & TIME)
403 						printf("%s %s %s",
404 						    atime_buf,
405 						    dtime_buf,
406 						    ctime_buf);
407 
408 					printf("\n");
409 				}
410 			}
411 			printf("\n");
412 		}
413 	} else
414 		if (display & (SHMINFO | SHMTOTAL)) {
415 			fprintf(stderr,
416 			    "SVID shared memory facility not configured in the system\n");
417 		}
418 	if ((display & (SEMINFO | SEMTOTAL)) &&
419 	    kvm_read(kd, symbols[X_SEMINFO].n_value, &seminfo, sizeof(seminfo))) {
420 		struct semid_ds *xsema;
421 
422 		if (display & SEMTOTAL) {
423 			printf("seminfo:\n");
424 			printf("\tsemmap: %6d\t(# of entries in semaphore map)\n",
425 			    seminfo.semmap);
426 			printf("\tsemmni: %6d\t(# of semaphore identifiers)\n",
427 			    seminfo.semmni);
428 			printf("\tsemmns: %6d\t(# of semaphores in system)\n",
429 			    seminfo.semmns);
430 			printf("\tsemmnu: %6d\t(# of undo structures in system)\n",
431 			    seminfo.semmnu);
432 			printf("\tsemmsl: %6d\t(max # of semaphores per id)\n",
433 			    seminfo.semmsl);
434 			printf("\tsemopm: %6d\t(max # of operations per semop call)\n",
435 			    seminfo.semopm);
436 			printf("\tsemume: %6d\t(max # of undo entries per process)\n",
437 			    seminfo.semume);
438 			printf("\tsemusz: %6d\t(size in bytes of undo structure)\n",
439 			    seminfo.semusz);
440 			printf("\tsemvmx: %6d\t(semaphore maximum value)\n",
441 			    seminfo.semvmx);
442 			printf("\tsemaem: %6d\t(adjust on exit max value)\n\n",
443 			    seminfo.semaem);
444 		}
445 		if (display & SEMINFO) {
446 			kvm_read(kd, symbols[X_SEMA].n_value, &sema, sizeof(sema));
447 			xsema = malloc(sizeof(struct semid_ds) * seminfo.semmni);
448 			kvm_read(kd, (u_long) sema, xsema, sizeof(struct semid_ds) * seminfo.semmni);
449 
450 			printf("Semaphores:\n");
451 			printf("T     ID     KEY        MODE       OWNER    GROUP");
452 			if (option & CREATOR)
453 				printf("  CREATOR   CGROUP");
454 			if (option & BIGGEST)
455 				printf(" NSEMS");
456 			if (option & TIME)
457 				printf("   OTIME    CTIME");
458 			printf("\n");
459 			for (i = 0; i < seminfo.semmni; i += 1) {
460 				if ((xsema[i].sem_perm.mode & SEM_ALLOC) != 0) {
461 					char    ctime_buf[100], otime_buf[100];
462 					struct semid_ds *semaptr = &xsema[i];
463 
464 					if (user && useruid != semaptr->sem_perm.uid)
465 						continue;
466 
467 					if (grp && grpgid != semaptr->sem_perm.gid)
468 						continue;
469 
470 					cvt_time(semaptr->sem_otime, otime_buf);
471 					cvt_time(semaptr->sem_ctime, ctime_buf);
472 
473 					printf("s %6d %10d %s %8s %8s",
474 					    IXSEQ_TO_IPCID(i, semaptr->sem_perm),
475 					    semaptr->sem_perm.key,
476 					    fmt_perm(semaptr->sem_perm.mode),
477 					    user_from_uid(semaptr->sem_perm.uid, 0),
478 					    group_from_gid(semaptr->sem_perm.gid, 0));
479 
480 					if (option & CREATOR)
481 						printf(" %8s %8s",
482 						    user_from_uid(semaptr->sem_perm.cuid, 0),
483 						    group_from_gid(semaptr->sem_perm.cgid, 0));
484 
485 					if (option & BIGGEST)
486 						printf(" %6d",
487 						    semaptr->sem_nsems);
488 
489 					if (option & TIME)
490 						printf("%s %s",
491 						    otime_buf,
492 						    ctime_buf);
493 
494 					printf("\n");
495 				}
496 			}
497 
498 			printf("\n");
499 		}
500 	} else
501 		if (display & (SEMINFO | SEMTOTAL)) {
502 			fprintf(stderr, "SVID semaphores facility not configured in the system\n");
503 		}
504 	kvm_close(kd);
505 
506 	exit(0);
507 }
508 
509 static uid_t
510 user2uid(const char *username)
511 {
512 	struct passwd *pwd;
513 	uid_t uid;
514 	char *r;
515 
516 	uid = strtoul(username, &r, 0);
517 	if (!*r && r != username)
518 		return (uid);
519 	if ((pwd = getpwnam(username)) == NULL)
520 		errx(1, "No such user");
521 	endpwent();
522 	return (pwd->pw_uid);
523 }
524 
525 static gid_t
526 grp2gid(const char *groupname)
527 {
528 	struct group *grp;
529 	gid_t gid;
530 	char *r;
531 
532 	gid = strtol(groupname, &r, 0);
533 	if (!*r && r != groupname)
534 		return (gid);
535 	if ((grp = getgrnam(groupname)) == NULL)
536 		errx(1, "No such group");
537 	endgrent();
538 	return (grp->gr_gid);
539 }
540 
541 static void
542 usage(void)
543 {
544 
545 	fprintf(stderr,
546 	    "usage: ipcs [-abcmopqstMQST] [-C corefile] [-N namelist] [-u user] [-g group]\n");
547 	exit(1);
548 }
549