xref: /freebsd/usr.bin/ipcs/ipcs.c (revision 5e3934b15a2741b2de6b217e77dc9d798d740804)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include <sys/param.h>
31 #include <sys/proc.h>
32 #define	_WANT_SYSVMSG_INTERNALS
33 #include <sys/msg.h>
34 #define	_WANT_SYSVSEM_INTERNALS
35 #include <sys/sem.h>
36 #define	_WANT_SYSVSHM_INTERNALS
37 #include <sys/shm.h>
38 
39 #include <err.h>
40 #include <fcntl.h>
41 #include <grp.h>
42 #include <kvm.h>
43 #include <limits.h>
44 #include <pwd.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49 
50 #include "ipc.h"
51 
52 char   *fmt_perm(u_short);
53 void	cvt_time(time_t, char *);
54 void	usage(void);
55 uid_t	user2uid(char *username);
56 
57 void	print_kmsqtotal(struct msginfo msginfo);
58 void	print_kmsqheader(int option);
59 void	print_kmsqptr(int i, int option, struct msqid_kernel *kmsqptr);
60 void	print_kshmtotal(struct shminfo shminfo);
61 void	print_kshmheader(int option);
62 void	print_kshmptr(int i, int option, struct shmid_kernel *kshmptr);
63 void	print_ksemtotal(struct seminfo seminfo);
64 void	print_ksemheader(int option);
65 void	print_ksemptr(int i, int option, struct semid_kernel *ksemaptr);
66 
67 char   *
fmt_perm(u_short mode)68 fmt_perm(u_short mode)
69 {
70 	static char buffer[100];
71 
72 	buffer[0] = '-';
73 	buffer[1] = '-';
74 	buffer[2] = ((mode & 0400) ? 'r' : '-');
75 	buffer[3] = ((mode & 0200) ? 'w' : '-');
76 	buffer[4] = ((mode & 0100) ? 'a' : '-');
77 	buffer[5] = ((mode & 0040) ? 'r' : '-');
78 	buffer[6] = ((mode & 0020) ? 'w' : '-');
79 	buffer[7] = ((mode & 0010) ? 'a' : '-');
80 	buffer[8] = ((mode & 0004) ? 'r' : '-');
81 	buffer[9] = ((mode & 0002) ? 'w' : '-');
82 	buffer[10] = ((mode & 0001) ? 'a' : '-');
83 	buffer[11] = '\0';
84 	return (&buffer[0]);
85 }
86 
87 void
cvt_time(time_t t,char * buf)88 cvt_time(time_t t, char *buf)
89 {
90 	struct tm *tm;
91 
92 	if (t == 0) {
93 		strcpy(buf, "no-entry");
94 	} else {
95 		tm = localtime(&t);
96 		sprintf(buf, "%2d:%02d:%02d",
97 			tm->tm_hour, tm->tm_min, tm->tm_sec);
98 	}
99 }
100 
101 #define BIGGEST		1
102 #define CREATOR		2
103 #define OUTSTANDING	4
104 #define PID		8
105 #define TIME		16
106 
107 int
main(int argc,char * argv[])108 main(int argc, char *argv[])
109 {
110 	int     display = SHMINFO | MSGINFO | SEMINFO;
111 	int     option = 0;
112 	char   *core = NULL, *user = NULL, *namelist = NULL;
113 	char	kvmoferr[_POSIX2_LINE_MAX];  /* Error buf for kvm_openfiles. */
114 	int     i;
115 	u_long  shmidx;
116 	uid_t   uid = 0;
117 
118 	while ((i = getopt(argc, argv, "MmQqSsabC:cN:optTu:y")) != -1)
119 		switch (i) {
120 		case 'a':
121 			option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
122 			break;
123 		case 'b':
124 			option |= BIGGEST;
125 			break;
126 		case 'C':
127 			core = optarg;
128 			break;
129 		case 'c':
130 			option |= CREATOR;
131 			break;
132 		case 'M':
133 			display = SHMTOTAL;
134 			break;
135 		case 'm':
136 			display = SHMINFO;
137 			break;
138 		case 'N':
139 			namelist = optarg;
140 			break;
141 		case 'o':
142 			option |= OUTSTANDING;
143 			break;
144 		case 'p':
145 			option |= PID;
146 			break;
147 		case 'Q':
148 			display = MSGTOTAL;
149 			break;
150 		case 'q':
151 			display = MSGINFO;
152 			break;
153 		case 'S':
154 			display = SEMTOTAL;
155 			break;
156 		case 's':
157 			display = SEMINFO;
158 			break;
159 		case 'T':
160 			display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
161 			break;
162 		case 't':
163 			option |= TIME;
164 			break;
165 		case 'u':
166 			user = optarg;
167 			uid = user2uid(user);
168 			break;
169 		case 'y':
170 			use_sysctl = 0;
171 			break;
172 		default:
173 			usage();
174 		}
175 
176 	/*
177 	 * If paths to the exec file or core file were specified, we
178 	 * aren't operating on the running kernel, so we can't use
179 	 * sysctl.
180 	 */
181 	if (namelist != NULL || core != NULL)
182 		use_sysctl = 0;
183 
184 	if (!use_sysctl) {
185 		kd = kvm_openfiles(namelist, core, NULL, O_RDONLY, kvmoferr);
186 		if (kd == NULL)
187 			errx(1, "kvm_openfiles: %s", kvmoferr);
188 		switch (kvm_nlist(kd, symbols)) {
189 		case 0:
190 			break;
191 		case -1:
192 			errx(1, "unable to read kernel symbol table");
193 		default:
194 			break;
195 		}
196 	}
197 
198 	kget(X_MSGINFO, &msginfo, sizeof(msginfo));
199 	if (display & (MSGINFO | MSGTOTAL)) {
200 		if (display & MSGTOTAL)
201 			print_kmsqtotal(msginfo);
202 
203 		if (display & MSGINFO) {
204 			struct msqid_kernel *kxmsqids;
205 			size_t kxmsqids_len;
206 
207 			kxmsqids_len =
208 			    sizeof(struct msqid_kernel) * msginfo.msgmni;
209 			kxmsqids = malloc(kxmsqids_len);
210 			kget(X_MSQIDS, kxmsqids, kxmsqids_len);
211 
212 			print_kmsqheader(option);
213 
214 			for (i = 0; i < msginfo.msgmni; i += 1) {
215 				if (kxmsqids[i].u.msg_qbytes != 0) {
216 					if (user &&
217 					    uid != kxmsqids[i].u.msg_perm.uid)
218 						continue;
219 
220 					print_kmsqptr(i, option, &kxmsqids[i]);
221 				}
222 
223 			}
224 
225 			printf("\n");
226 		}
227 	}
228 
229 	kget(X_SHMINFO, &shminfo, sizeof(shminfo));
230 	if (display & (SHMINFO | SHMTOTAL)) {
231 
232 		if (display & SHMTOTAL)
233 			print_kshmtotal(shminfo);
234 
235 		if (display & SHMINFO) {
236 			struct shmid_kernel *kxshmids;
237 			size_t kxshmids_len;
238 
239 			kxshmids_len =
240 			    sizeof(struct shmid_kernel) * shminfo.shmmni;
241 			kxshmids = malloc(kxshmids_len);
242 			kget(X_SHMSEGS, kxshmids, kxshmids_len);
243 
244 			print_kshmheader(option);
245 
246 			for (shmidx = 0; shmidx < shminfo.shmmni; shmidx += 1) {
247 				if (kxshmids[shmidx].u.shm_perm.mode & 0x0800) {
248 					if (user &&
249 					    uid != kxshmids[shmidx].u.shm_perm.uid)
250 						continue;
251 
252 					print_kshmptr(shmidx, option, &kxshmids[shmidx]);
253 				}
254 			}
255 			printf("\n");
256 		}
257 	}
258 
259 	kget(X_SEMINFO, &seminfo, sizeof(seminfo));
260 	if (display & (SEMINFO | SEMTOTAL)) {
261 		struct semid_kernel *kxsema;
262 		size_t kxsema_len;
263 
264 		if (display & SEMTOTAL)
265 			print_ksemtotal(seminfo);
266 
267 		if (display & SEMINFO) {
268 			kxsema_len =
269 			    sizeof(struct semid_kernel) * seminfo.semmni;
270 			kxsema = malloc(kxsema_len);
271 			kget(X_SEMA, kxsema, kxsema_len);
272 
273 			print_ksemheader(option);
274 
275 			for (i = 0; i < seminfo.semmni; i += 1) {
276 				if ((kxsema[i].u.sem_perm.mode & SEM_ALLOC)
277 				    != 0) {
278 					if (user &&
279 					    uid != kxsema[i].u.sem_perm.uid)
280 						continue;
281 
282 					print_ksemptr(i, option, &kxsema[i]);
283 
284 				}
285 			}
286 
287 			printf("\n");
288 		}
289 	}
290 
291 	if (!use_sysctl)
292 		kvm_close(kd);
293 
294 	exit(0);
295 }
296 
297 void
print_kmsqtotal(struct msginfo local_msginfo)298 print_kmsqtotal(struct msginfo local_msginfo)
299 {
300 
301 	printf("msginfo:\n");
302 	printf("\tmsgmax: %12d\t(max characters in a message)\n",
303 	    local_msginfo.msgmax);
304 	printf("\tmsgmni: %12d\t(# of message queues)\n",
305 	    local_msginfo.msgmni);
306 	printf("\tmsgmnb: %12d\t(max characters in a message queue)\n",
307 	    local_msginfo.msgmnb);
308 	printf("\tmsgtql: %12d\t(max # of messages in system)\n",
309 	    local_msginfo.msgtql);
310 	printf("\tmsgssz: %12d\t(size of a message segment)\n",
311 	    local_msginfo.msgssz);
312 	printf("\tmsgseg: %12d\t(# of message segments in system)\n\n",
313 	    local_msginfo.msgseg);
314 }
315 
print_kmsqheader(int option)316 void print_kmsqheader(int option)
317 {
318 
319 	printf("Message Queues:\n");
320 	printf("T %12s %12s %-11s %-8s %-8s",
321 	    "ID", "KEY", "MODE", "OWNER", "GROUP");
322 	if (option & CREATOR)
323 		printf(" %-8s %-8s", "CREATOR", "CGROUP");
324 	if (option & OUTSTANDING)
325 		printf(" %20s %20s", "CBYTES", "QNUM");
326 	if (option & BIGGEST)
327 		printf(" %20s", "QBYTES");
328 	if (option & PID)
329 		printf(" %12s %12s", "LSPID", "LRPID");
330 	if (option & TIME)
331 		printf(" %-8s %-8s %-8s", "STIME", "RTIME", "CTIME");
332 	printf("\n");
333 }
334 
335 void
print_kmsqptr(int i,int option,struct msqid_kernel * kmsqptr)336 print_kmsqptr(int i, int option, struct msqid_kernel *kmsqptr)
337 {
338 	char    stime_buf[100], rtime_buf[100], ctime_buf[100];
339 
340 	cvt_time(kmsqptr->u.msg_stime, stime_buf);
341 	cvt_time(kmsqptr->u.msg_rtime, rtime_buf);
342 	cvt_time(kmsqptr->u.msg_ctime, ctime_buf);
343 
344 	printf("q %12d %12d %s %-8s %-8s",
345 	    IXSEQ_TO_IPCID(i, kmsqptr->u.msg_perm),
346 	    (int)kmsqptr->u.msg_perm.key,
347 	    fmt_perm(kmsqptr->u.msg_perm.mode),
348 	    user_from_uid(kmsqptr->u.msg_perm.uid, 0),
349 	    group_from_gid(kmsqptr->u.msg_perm.gid, 0));
350 
351 	if (option & CREATOR)
352 		printf(" %-8s %-8s",
353 		    user_from_uid(kmsqptr->u.msg_perm.cuid, 0),
354 		    group_from_gid(kmsqptr->u.msg_perm.cgid, 0));
355 
356 	if (option & OUTSTANDING)
357 		printf(" %12lu %12lu",
358 		    kmsqptr->u.msg_cbytes,
359 		    kmsqptr->u.msg_qnum);
360 
361 	if (option & BIGGEST)
362 		printf(" %20lu", kmsqptr->u.msg_qbytes);
363 
364 	if (option & PID)
365 		printf(" %12d %12d",
366 		    kmsqptr->u.msg_lspid,
367 		    kmsqptr->u.msg_lrpid);
368 
369 	if (option & TIME)
370 		printf(" %s %s %s",
371 		    stime_buf,
372 		    rtime_buf,
373 		    ctime_buf);
374 
375 	printf("\n");
376 }
377 
378 void
print_kshmtotal(struct shminfo local_shminfo)379 print_kshmtotal(struct shminfo local_shminfo)
380 {
381 
382 	printf("shminfo:\n");
383 	printf("\tshmmax: %12lu\t(max shared memory segment size)\n",
384 	    local_shminfo.shmmax);
385 	printf("\tshmmin: %12lu\t(min shared memory segment size)\n",
386 	    local_shminfo.shmmin);
387 	printf("\tshmmni: %12lu\t(max number of shared memory identifiers)\n",
388 	    local_shminfo.shmmni);
389 	printf("\tshmseg: %12lu\t(max shared memory segments per process)\n",
390 	    local_shminfo.shmseg);
391 	printf("\tshmall: %12lu\t(max amount of shared memory in pages)\n\n",
392 	    local_shminfo.shmall);
393 }
394 
395 void
print_kshmheader(int option)396 print_kshmheader(int option)
397 {
398 
399 	printf("Shared Memory:\n");
400 	printf("T %12s %12s %-11s %-8s %-8s",
401 	    "ID", "KEY", "MODE", "OWNER", "GROUP");
402 	if (option & CREATOR)
403 		printf(" %-8s %-8s", "CREATOR", "CGROUP");
404 	if (option & OUTSTANDING)
405 		printf(" %12s", "NATTCH");
406 	if (option & BIGGEST)
407 		printf(" %12s", "SEGSZ");
408 	if (option & PID)
409 		printf(" %12s %12s", "CPID", "LPID");
410 	if (option & TIME)
411 		printf(" %-8s %-8s %-8s", "ATIME", "DTIME", "CTIME");
412 	printf("\n");
413 }
414 
415 void
print_kshmptr(int i,int option,struct shmid_kernel * kshmptr)416 print_kshmptr(int i, int option, struct shmid_kernel *kshmptr)
417 {
418 	char    atime_buf[100], dtime_buf[100], ctime_buf[100];
419 
420 	cvt_time(kshmptr->u.shm_atime, atime_buf);
421 	cvt_time(kshmptr->u.shm_dtime, dtime_buf);
422 	cvt_time(kshmptr->u.shm_ctime, ctime_buf);
423 
424 	printf("m %12d %12d %s %-8s %-8s",
425 	    IXSEQ_TO_IPCID(i, kshmptr->u.shm_perm),
426 	    (int)kshmptr->u.shm_perm.key,
427 	    fmt_perm(kshmptr->u.shm_perm.mode),
428 	    user_from_uid(kshmptr->u.shm_perm.uid, 0),
429 	    group_from_gid(kshmptr->u.shm_perm.gid, 0));
430 
431 	if (option & CREATOR)
432 		printf(" %-8s %-8s",
433 		    user_from_uid(kshmptr->u.shm_perm.cuid, 0),
434 		    group_from_gid(kshmptr->u.shm_perm.cgid, 0));
435 
436 	if (option & OUTSTANDING)
437 		printf(" %12d",
438 		    kshmptr->u.shm_nattch);
439 
440 	if (option & BIGGEST)
441 		printf(" %12zu",
442 		    kshmptr->u.shm_segsz);
443 
444 	if (option & PID)
445 		printf(" %12d %12d",
446 		    kshmptr->u.shm_cpid,
447 		    kshmptr->u.shm_lpid);
448 
449 	if (option & TIME)
450 		printf(" %s %s %s",
451 		    atime_buf,
452 		    dtime_buf,
453 		    ctime_buf);
454 
455 	printf("\n");
456 }
457 
458 void
print_ksemtotal(struct seminfo local_seminfo)459 print_ksemtotal(struct seminfo local_seminfo)
460 {
461 
462 	printf("seminfo:\n");
463 	printf("\tsemmni: %12d\t(# of semaphore identifiers)\n",
464 	    local_seminfo.semmni);
465 	printf("\tsemmns: %12d\t(# of semaphores in system)\n",
466 	    local_seminfo.semmns);
467 	printf("\tsemmnu: %12d\t(# of undo structures in system)\n",
468 	    local_seminfo.semmnu);
469 	printf("\tsemmsl: %12d\t(max # of semaphores per id)\n",
470 	    local_seminfo.semmsl);
471 	printf("\tsemopm: %12d\t(max # of operations per semop call)\n",
472 	    local_seminfo.semopm);
473 	printf("\tsemume: %12d\t(max # of undo entries per process)\n",
474 	    local_seminfo.semume);
475 	printf("\tsemusz: %12d\t(size in bytes of undo structure)\n",
476 	    local_seminfo.semusz);
477 	printf("\tsemvmx: %12d\t(semaphore maximum value)\n",
478 	    local_seminfo.semvmx);
479 	printf("\tsemaem: %12d\t(adjust on exit max value)\n\n",
480 	    local_seminfo.semaem);
481 }
482 
483 void
print_ksemheader(int option)484 print_ksemheader(int option)
485 {
486 
487 	printf("Semaphores:\n");
488 	printf("T %12s %12s %-11s %-8s %-8s",
489 	    "ID", "KEY", "MODE", "OWNER", "GROUP");
490 	if (option & CREATOR)
491 		printf(" %-8s %-8s", "CREATOR", "CGROUP");
492 	if (option & BIGGEST)
493 		printf(" %12s", "NSEMS");
494 	if (option & TIME)
495 		printf(" %-8s %-8s", "OTIME", "CTIME");
496 	printf("\n");
497 }
498 
499 void
print_ksemptr(int i,int option,struct semid_kernel * ksemaptr)500 print_ksemptr(int i, int option, struct semid_kernel *ksemaptr)
501 {
502 	char    ctime_buf[100], otime_buf[100];
503 
504 	cvt_time(ksemaptr->u.sem_otime, otime_buf);
505 	cvt_time(ksemaptr->u.sem_ctime, ctime_buf);
506 
507 	printf("s %12d %12d %s %-8s %-8s",
508 	    IXSEQ_TO_IPCID(i, ksemaptr->u.sem_perm),
509 	    (int)ksemaptr->u.sem_perm.key,
510 	    fmt_perm(ksemaptr->u.sem_perm.mode),
511 	    user_from_uid(ksemaptr->u.sem_perm.uid, 0),
512 	    group_from_gid(ksemaptr->u.sem_perm.gid, 0));
513 
514 	if (option & CREATOR)
515 		printf(" %-8s %-8s",
516 		    user_from_uid(ksemaptr->u.sem_perm.cuid, 0),
517 		    group_from_gid(ksemaptr->u.sem_perm.cgid, 0));
518 
519 	if (option & BIGGEST)
520 		printf(" %12d",
521 		    ksemaptr->u.sem_nsems);
522 
523 	if (option & TIME)
524 		printf(" %s %s",
525 		    otime_buf,
526 		    ctime_buf);
527 
528 	printf("\n");
529 }
530 
531 uid_t
user2uid(char * username)532 user2uid(char *username)
533 {
534 	struct passwd *pwd;
535 	uid_t uid;
536 	char *r;
537 
538 	uid = strtoul(username, &r, 0);
539 	if (!*r && r != username)
540 		return (uid);
541 	if ((pwd = getpwnam(username)) == NULL)
542 		errx(1, "getpwnam failed: No such user");
543 	endpwent();
544 	return (pwd->pw_uid);
545 }
546 
547 void
usage(void)548 usage(void)
549 {
550 
551 	fprintf(stderr,
552 	    "usage: "
553 	    "ipcs [-abcmopqstyMQST] [-C corefile] [-N namelist] [-u user]\n");
554 	exit(1);
555 }
556