usr.bin/ipcs/ipcs.c

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