xref: /dragonfly/usr.bin/ipcs/ipcs.c (revision 36a3d1d6) 
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 1.8 2005/04/19 20:38:57 dillon 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 	char	*user, *grp;
137 	int     i;
138 	uid_t	useruid;
139 	gid_t	grpgid;
140 
141 	core = namelist = NULL;
142 	user = grp = NULL;
143 
144 	while ((i = getopt(argc, argv, "MmQqSsabC:cN:ou:g:ptT")) != -1)
145 		switch (i) {
146 		case 'M':
147 			display = SHMTOTAL;
148 			break;
149 		case 'm':
150 			display = SHMINFO;
151 			break;
152 		case 'Q':
153 			display = MSGTOTAL;
154 			break;
155 		case 'q':
156 			display = MSGINFO;
157 			break;
158 		case 'S':
159 			display = SEMTOTAL;
160 			break;
161 		case 's':
162 			display = SEMINFO;
163 			break;
164 		case 'T':
165 			display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
166 			break;
167 		case 'a':
168 			option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
169 			break;
170 		case 'b':
171 			option |= BIGGEST;
172 			break;
173 		case 'C':
174 			core = optarg;
175 			break;
176 		case 'c':
177 			option |= CREATOR;
178 			break;
179 		case 'N':
180 			namelist = optarg;
181 			break;
182 		case 'o':
183 			option |= OUTSTANDING;
184 			break;
185 		case 'p':
186 			option |= PID;
187 			break;
188 		case 't':
189 			option |= TIME;
190 			break;
191 		case 'u':
192 			user = optarg;
193 			grp = NULL;
194 			useruid = user2uid(optarg);
195 			break;
196 		case 'g':
197 			grp = optarg;
198 			user = NULL;
199 			grpgid = grp2gid(optarg);
200 			break;
201 		default:
202 			usage();
203 		}
204 
205 	/*
206 	 * Discard setgid privileges if not the running kernel so that bad
207 	 * guys can't print interesting stuff from kernel memory.
208 	 */
209 	if (namelist != NULL || core != NULL)
210 		setgid(getgid());
211 
212 	if ((kd = kvm_open(namelist, core, NULL, O_RDONLY, "ipcs")) == NULL)
213 		exit(1);
214 
215 	switch (kvm_nlist(kd, symbols)) {
216 	case 0:
217 		break;
218 	case -1:
219 		errx(1, "unable to read kernel symbol table");
220 	default:
221 #ifdef notdef		/* they'll be told more civilly later */
222 		warnx("nlist failed");
223 		for (i = 0; symbols[i].n_name != NULL; i++)
224 			if (symbols[i].n_value == 0)
225 				warnx("symbol %s not found",
226 				    symbols[i].n_name);
227 #endif
228 		break;
229 	}
230 
231 	if ((display & (MSGINFO | MSGTOTAL)) &&
232 	    kvm_read(kd, symbols[X_MSGINFO].n_value, &msginfo, sizeof(msginfo))== sizeof(msginfo)) {
233 
234 		if (display & MSGTOTAL) {
235 			printf("msginfo:\n");
236 			printf("\tmsgmax: %6d\t(max characters in a message)\n",
237 			    msginfo.msgmax);
238 			printf("\tmsgmni: %6d\t(# of message queues)\n",
239 			    msginfo.msgmni);
240 			printf("\tmsgmnb: %6d\t(max characters in a message queue)\n",
241 			    msginfo.msgmnb);
242 			printf("\tmsgtql: %6d\t(max # of messages in system)\n",
243 			    msginfo.msgtql);
244 			printf("\tmsgssz: %6d\t(size of a message segment)\n",
245 			    msginfo.msgssz);
246 			printf("\tmsgseg: %6d\t(# of message segments in system)\n\n",
247 			    msginfo.msgseg);
248 		}
249 		if (display & MSGINFO) {
250 			struct msqid_ds *xmsqids;
251 
252 			kvm_read(kd, symbols[X_MSQIDS].n_value, &msqids, sizeof(msqids));
253 			xmsqids = malloc(sizeof(struct msqid_ds) * msginfo.msgmni);
254 			kvm_read(kd, (u_long) msqids, xmsqids, sizeof(struct msqid_ds) * msginfo.msgmni);
255 
256 			printf("Message Queues:\n");
257 			printf("T     ID     KEY        MODE       OWNER    GROUP");
258 			if (option & CREATOR)
259 				printf("  CREATOR   CGROUP");
260 			if (option & OUTSTANDING)
261 				printf(" CBYTES  QNUM");
262 			if (option & BIGGEST)
263 				printf(" QBYTES");
264 			if (option & PID)
265 				printf(" LSPID LRPID");
266 			if (option & TIME)
267 				printf("   STIME    RTIME    CTIME");
268 			printf("\n");
269 			for (i = 0; i < msginfo.msgmni; i += 1) {
270 				if (xmsqids[i].msg_qbytes != 0) {
271 					char    stime_buf[100], rtime_buf[100],
272 					        ctime_buf[100];
273 					struct msqid_ds *msqptr = &xmsqids[i];
274 
275 					if (user && useruid != msqptr->msg_perm.uid)
276 							continue;
277 					if (grp && grpgid != msqptr->msg_perm.gid)
278 							continue;
279 
280 					cvt_time(msqptr->msg_stime, stime_buf);
281 					cvt_time(msqptr->msg_rtime, rtime_buf);
282 					cvt_time(msqptr->msg_ctime, ctime_buf);
283 
284 					printf("q %6d %10d %s %8s %8s",
285 					    IXSEQ_TO_IPCID(i, msqptr->msg_perm),
286 					    msqptr->msg_perm.key,
287 					    fmt_perm(msqptr->msg_perm.mode),
288 					    user_from_uid(msqptr->msg_perm.uid, 0),
289 					    group_from_gid(msqptr->msg_perm.gid, 0));
290 
291 					if (option & CREATOR)
292 						printf(" %8s %8s",
293 						    user_from_uid(msqptr->msg_perm.cuid, 0),
294 						    group_from_gid(msqptr->msg_perm.cgid, 0));
295 
296 					if (option & OUTSTANDING)
297 						printf(" %6d %6d",
298 						    msqptr->msg_cbytes,
299 						    msqptr->msg_qnum);
300 
301 					if (option & BIGGEST)
302 						printf(" %6d",
303 						    msqptr->msg_qbytes);
304 
305 					if (option & PID)
306 						printf(" %6d %6d",
307 						    msqptr->msg_lspid,
308 						    msqptr->msg_lrpid);
309 
310 					if (option & TIME)
311 						printf("%s %s %s",
312 						    stime_buf,
313 						    rtime_buf,
314 						    ctime_buf);
315 
316 					printf("\n");
317 				}
318 			}
319 			printf("\n");
320 		}
321 	} else
322 		if (display & (MSGINFO | MSGTOTAL)) {
323 			fprintf(stderr,
324 			    "SVID messages facility not configured in the system\n");
325 		}
326 	if ((display & (SHMINFO | SHMTOTAL)) &&
327 	    kvm_read(kd, symbols[X_SHMINFO].n_value, &shminfo, sizeof(shminfo))) {
328 		if (display & SHMTOTAL) {
329 			printf("shminfo:\n");
330 			printf("\tshmmax: %7d\t(max shared memory segment size)\n",
331 			    shminfo.shmmax);
332 			printf("\tshmmin: %7d\t(min shared memory segment size)\n",
333 			    shminfo.shmmin);
334 			printf("\tshmmni: %7d\t(max number of shared memory identifiers)\n",
335 			    shminfo.shmmni);
336 			printf("\tshmseg: %7d\t(max shared memory segments per process)\n",
337 			    shminfo.shmseg);
338 			printf("\tshmall: %7d\t(max amount of shared memory in pages)\n\n",
339 			    shminfo.shmall);
340 		}
341 		if (display & SHMINFO) {
342 			struct shmid_ds *xshmids;
343 
344 			kvm_read(kd, symbols[X_SHMSEGS].n_value, &shmsegs, sizeof(shmsegs));
345 			xshmids = malloc(sizeof(struct shmid_ds) * shminfo.shmmni);
346 			kvm_read(kd, (u_long) shmsegs, xshmids, sizeof(struct shmid_ds) *
347 			    shminfo.shmmni);
348 
349 			printf("Shared Memory:\n");
350 			printf("T     ID     KEY        MODE       OWNER    GROUP");
351 			if (option & CREATOR)
352 				printf("  CREATOR   CGROUP");
353 			if (option & OUTSTANDING)
354 				printf(" NATTCH");
355 			if (option & BIGGEST)
356 				printf("  SEGSZ");
357 			if (option & PID)
358 				printf("  CPID  LPID");
359 			if (option & TIME)
360 				printf("   ATIME    DTIME    CTIME");
361 			printf("\n");
362 			for (i = 0; i < shminfo.shmmni; i += 1) {
363 				if (xshmids[i].shm_perm.mode & 0x0800) {
364 					char    atime_buf[100], dtime_buf[100],
365 					        ctime_buf[100];
366 					struct shmid_ds *shmptr = &xshmids[i];
367 
368 					if (user && useruid != shmptr->shm_perm.uid)
369 						continue;
370 
371 					if (grp && grpgid != shmptr->shm_perm.gid)
372 						continue;
373 
374 					cvt_time(shmptr->shm_atime, atime_buf);
375 					cvt_time(shmptr->shm_dtime, dtime_buf);
376 					cvt_time(shmptr->shm_ctime, ctime_buf);
377 
378 					printf("m %6d %10d %s %8s %8s",
379 					    IXSEQ_TO_IPCID(i, shmptr->shm_perm),
380 					    shmptr->shm_perm.key,
381 					    fmt_perm(shmptr->shm_perm.mode),
382 					    user_from_uid(shmptr->shm_perm.uid, 0),
383 					    group_from_gid(shmptr->shm_perm.gid, 0));
384 
385 					if (option & CREATOR)
386 						printf(" %8s %8s",
387 						    user_from_uid(shmptr->shm_perm.cuid, 0),
388 						    group_from_gid(shmptr->shm_perm.cgid, 0));
389 
390 					if (option & OUTSTANDING)
391 						printf(" %6d",
392 						    shmptr->shm_nattch);
393 
394 					if (option & BIGGEST)
395 						printf(" %6d",
396 						    shmptr->shm_segsz);
397 
398 					if (option & PID)
399 						printf(" %6d %6d",
400 						    shmptr->shm_cpid,
401 						    shmptr->shm_lpid);
402 
403 					if (option & TIME)
404 						printf("%s %s %s",
405 						    atime_buf,
406 						    dtime_buf,
407 						    ctime_buf);
408 
409 					printf("\n");
410 				}
411 			}
412 			printf("\n");
413 		}
414 	} else
415 		if (display & (SHMINFO | SHMTOTAL)) {
416 			fprintf(stderr,
417 			    "SVID shared memory facility not configured in the system\n");
418 		}
419 	if ((display & (SEMINFO | SEMTOTAL)) &&
420 	    kvm_read(kd, symbols[X_SEMINFO].n_value, &seminfo, sizeof(seminfo))) {
421 		struct semid_ds *xsema;
422 
423 		if (display & SEMTOTAL) {
424 			printf("seminfo:\n");
425 			printf("\tsemmap: %6d\t(# of entries in semaphore map)\n",
426 			    seminfo.semmap);
427 			printf("\tsemmni: %6d\t(# of semaphore identifiers)\n",
428 			    seminfo.semmni);
429 			printf("\tsemmns: %6d\t(# of semaphores in system)\n",
430 			    seminfo.semmns);
431 			printf("\tsemmnu: %6d\t(# of undo structures in system)\n",
432 			    seminfo.semmnu);
433 			printf("\tsemmsl: %6d\t(max # of semaphores per id)\n",
434 			    seminfo.semmsl);
435 			printf("\tsemopm: %6d\t(max # of operations per semop call)\n",
436 			    seminfo.semopm);
437 			printf("\tsemume: %6d\t(max # of undo entries per process)\n",
438 			    seminfo.semume);
439 			printf("\tsemusz: %6d\t(size in bytes of undo structure)\n",
440 			    seminfo.semusz);
441 			printf("\tsemvmx: %6d\t(semaphore maximum value)\n",
442 			    seminfo.semvmx);
443 			printf("\tsemaem: %6d\t(adjust on exit max value)\n\n",
444 			    seminfo.semaem);
445 		}
446 		if (display & SEMINFO) {
447 			kvm_read(kd, symbols[X_SEMA].n_value, &sema, sizeof(sema));
448 			xsema = malloc(sizeof(struct semid_ds) * seminfo.semmni);
449 			kvm_read(kd, (u_long) sema, xsema, sizeof(struct semid_ds) * seminfo.semmni);
450 
451 			printf("Semaphores:\n");
452 			printf("T     ID     KEY        MODE       OWNER    GROUP");
453 			if (option & CREATOR)
454 				printf("  CREATOR   CGROUP");
455 			if (option & BIGGEST)
456 				printf(" NSEMS");
457 			if (option & TIME)
458 				printf("   OTIME    CTIME");
459 			printf("\n");
460 			for (i = 0; i < seminfo.semmni; i += 1) {
461 				if ((xsema[i].sem_perm.mode & SEM_ALLOC) != 0) {
462 					char    ctime_buf[100], otime_buf[100];
463 					struct semid_ds *semaptr = &xsema[i];
464 
465 					if (user && useruid != semaptr->sem_perm.uid)
466 						continue;
467 
468 					if (grp && grpgid != semaptr->sem_perm.gid)
469 						continue;
470 
471 					cvt_time(semaptr->sem_otime, otime_buf);
472 					cvt_time(semaptr->sem_ctime, ctime_buf);
473 
474 					printf("s %6d %10d %s %8s %8s",
475 					    IXSEQ_TO_IPCID(i, semaptr->sem_perm),
476 					    semaptr->sem_perm.key,
477 					    fmt_perm(semaptr->sem_perm.mode),
478 					    user_from_uid(semaptr->sem_perm.uid, 0),
479 					    group_from_gid(semaptr->sem_perm.gid, 0));
480 
481 					if (option & CREATOR)
482 						printf(" %8s %8s",
483 						    user_from_uid(semaptr->sem_perm.cuid, 0),
484 						    group_from_gid(semaptr->sem_perm.cgid, 0));
485 
486 					if (option & BIGGEST)
487 						printf(" %6d",
488 						    semaptr->sem_nsems);
489 
490 					if (option & TIME)
491 						printf("%s %s",
492 						    otime_buf,
493 						    ctime_buf);
494 
495 					printf("\n");
496 				}
497 			}
498 
499 			printf("\n");
500 		}
501 	} else
502 		if (display & (SEMINFO | SEMTOTAL)) {
503 			fprintf(stderr, "SVID semaphores facility not configured in the system\n");
504 		}
505 	kvm_close(kd);
506 
507 	exit(0);
508 }
509 
510 static uid_t
511 user2uid(const char *username)
512 {
513 	struct passwd *pwd;
514 	uid_t uid;
515 	char *r;
516 
517 	uid = strtoul(username, &r, 0);
518 	if (!*r && r != username)
519 		return (uid);
520 	if ((pwd = getpwnam(username)) == NULL)
521 		errx(1, "No such user");
522 	endpwent();
523 	return (pwd->pw_uid);
524 }
525 
526 static gid_t
527 grp2gid(const char *groupname)
528 {
529 	struct group *grp;
530 	gid_t gid;
531 	char *r;
532 
533 	gid = strtol(groupname, &r, 0);
534 	if (!*r && r != groupname)
535 		return (gid);
536 	if ((grp = getgrnam(groupname)) == NULL)
537 		errx(1, "No such group");
538 	endgrent();
539 	return (grp->gr_gid);
540 }
541 
542 static void
543 usage(void)
544 {
545 
546 	fprintf(stderr,
547 	    "usage: ipcs [-abcmopqstMQST] [-C corefile] [-N namelist] [-u user] [-g group]\n");
548 	exit(1);
549 }
550