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  * $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: %12lu\t(max shared memory segment size)\n",
 331                             shminfo.shmmax);
 332                         printf("\tshmmin: %12d\t(min shared memory segment size)\n",
 333                             shminfo.shmmin);
 334                         printf("\tshmmni: %12d\t(max number of shared memory identifiers)\n",
 335                             shminfo.shmmni);
 336                         printf("\tshmseg: %12d\t(max shared memory segments per process)\n",
 337                             shminfo.shmseg);
 338                         printf("\tshmall: %12d\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(" %12ul",
 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 }