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 1.7 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 }