usr.bin/fstat/fstat.c

   1 /*-
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)fstat.c  8.3 (Berkeley) 5/2/95
  35  * $FreeBSD: src/usr.bin/fstat/fstat.c,v 1.21.2.7 2001/11/21 10:49:37 dwmalone Exp $
  36  * $DragonFly: src/usr.bin/fstat/fstat.c,v 1.26 2008/05/03 04:13:12 dillon Exp $
  37  */
  38
  39 #define _KERNEL_STRUCTURES
  40
  41 #include <sys/param.h>
  42 #include <sys/time.h>
  43 #include <sys/user.h>
  44 #include <sys/stat.h>
  45 #include <sys/vnode.h>
  46 #include <sys/socket.h>
  47 #include <sys/socketvar.h>
  48 #include <sys/domain.h>
  49 #include <sys/protosw.h>
  50 #include <sys/un.h>
  51 #include <sys/unpcb.h>
  52 #include <sys/sysctl.h>
  53 #include <sys/filedesc.h>
  54 #include <sys/queue.h>
  55 #include <sys/pipe.h>
  56 #include <sys/conf.h>
  57 #include <sys/file.h>
  58 #include <sys/ktrace.h>
  59 #include <vfs/ufs/quota.h>
  60 #include <vfs/ufs/inode.h>
  61 #include <sys/mount.h>
  62 #include <sys/namecache.h>
  63 #include <nfs/nfsproto.h>
  64 #include <nfs/rpcv2.h>
  65 #include <nfs/nfs.h>
  66 #include <nfs/nfsnode.h>
  67
  68
  69 #include <vm/vm.h>
  70 #include <vm/vm_map.h>
  71 #include <vm/vm_object.h>
  72
  73 #include <net/route.h>
  74 #include <netinet/in.h>
  75 #include <netinet/in_systm.h>
  76 #include <netinet/ip.h>
  77 #include <netinet/in_pcb.h>
  78
  79 #include <ctype.h>
  80 #include <err.h>
  81 #include <fcntl.h>
  82 #include <kvm.h>
  83 #include <limits.h>
  84 #include <nlist.h>
  85 #include <paths.h>
  86 #include <pwd.h>
  87 #include <stdio.h>
  88 #include <stdlib.h>
  89 #include <string.h>
  90 #include <unistd.h>
  91 #include <netdb.h>
  92
  93 #include "fstat.h"
  94
  95 #define TEXT    -1
  96 #define CDIR    -2
  97 #define RDIR    -3
  98 #define TRACE   -4
  99 #define MMAP    -5
 100
 101 DEVS *devs;
 102
 103 static void make_printable(char *buf, int len);
 104
 105 #ifdef notdef
 106 struct nlist nl[] = {
 107         { "" },
 108 };
 109 #endif
 110
 111 int     fsflg,  /* show files on same filesystem as file(s) argument */
 112         pflg,   /* show files open by a particular pid */
 113         uflg;   /* show files open by a particular (effective) user */
 114 int     checkfile; /* true if restricting to particular files or filesystems */
 115 int     nflg;   /* (numerical) display f.s. and rdev as dev_t */
 116 int     vflg;   /* display errors in locating kernel data objects etc... */
 117 int     mflg;   /* include memory-mapped files */
 118 int     wflg_mnt = 16;
 119 int     wflg_cmd = 10;
 120 int     pid_width = 5;
 121 int     ino_width = 6;
 122
 123
 124 struct fdnode *ofiles;  /* buffer of pointers to file structures */
 125 int maxfiles;
 126
 127 #define ALLOC_OFILES(d) \
 128         if ((d) > maxfiles) { \
 129                 free(ofiles); \
 130                 ofiles = malloc((d) * sizeof(struct fdnode)); \
 131                 if (ofiles == NULL) { \
 132                         err(1, NULL); \
 133                 } \
 134                 maxfiles = (d); \
 135         }
 136
 137 kvm_t *kd;
 138
 139 void dofiles(struct kinfo_proc *kp, struct proc *p);
 140 void dommap(struct proc *p);
 141 void vtrans(struct vnode *vp, struct nchandle *ncr, int i, int flag);
 142 int  ufs_filestat(struct vnode *vp, struct filestat *fsp);
 143 int  nfs_filestat(struct vnode *vp, struct filestat *fsp);
 144 char *getmnton(struct mount *m, struct namecache_list *ncplist, struct nchandle *ncr);
 145 void pipetrans(struct pipe *pi, int i, int flag);
 146 void socktrans(struct socket *sock, int i);
 147 void getinetproto(int number);
 148 int  getfname(const char *filename);
 149 void usage(void);
 150
 151
 152 int
 153 main(int argc, char **argv)
 154 {
 155         struct passwd *passwd;
 156         struct kinfo_proc *p, *plast;
 157         struct proc proc;
 158         int arg, ch, what;
 159         char *memf, *nlistf;
 160         char buf[_POSIX2_LINE_MAX];
 161         int cnt;
 162
 163         arg = 0;
 164         what = KERN_PROC_ALL;
 165         nlistf = memf = NULL;
 166         while ((ch = getopt(argc, argv, "fmnp:u:vwN:M:")) != -1)
 167                 switch((char)ch) {
 168                 case 'f':
 169                         fsflg = 1;
 170                         break;
 171                 case 'M':
 172                         memf = optarg;
 173                         break;
 174                 case 'N':
 175                         nlistf = optarg;
 176                         break;
 177                 case 'm':
 178                         mflg = 1;
 179                         break;
 180                 case 'n':
 181                         nflg = 1;
 182                         break;
 183                 case 'p':
 184                         if (pflg++)
 185                                 usage();
 186                         if (!isdigit(*optarg)) {
 187                                 warnx("-p requires a process id");
 188                                 usage();
 189                         }
 190                         what = KERN_PROC_PID;
 191                         arg = atoi(optarg);
 192                         break;
 193                 case 'u':
 194                         if (uflg++)
 195                                 usage();
 196                         if (!(passwd = getpwnam(optarg)))
 197                                 errx(1, "%s: unknown uid", optarg);
 198                         what = KERN_PROC_UID;
 199                         arg = passwd->pw_uid;
 200                         break;
 201                 case 'v':
 202                         vflg = 1;
 203                         break;
 204                 case 'w':
 205                         wflg_mnt = 40;
 206                         wflg_cmd = 16;
 207                         break;
 208                 case '?':
 209                 default:
 210                         usage();
 211                 }
 212
 213         if (*(argv += optind)) {
 214                 for (; *argv; ++argv) {
 215                         if (getfname(*argv))
 216                                 checkfile = 1;
 217                 }
 218                 if (!checkfile) /* file(s) specified, but none accessable */
 219                         exit(1);
 220         }
 221
 222         ALLOC_OFILES(256);      /* reserve space for file pointers */
 223
 224         if (fsflg && !checkfile) {
 225                 /* -f with no files means use wd */
 226                 if (getfname(".") == 0)
 227                         exit(1);
 228                 checkfile = 1;
 229         }
 230
 231         /*
 232          * Discard setgid privileges if not the running kernel so that bad
 233          * guys can't print interesting stuff from kernel memory.
 234          */
 235         if (nlistf != NULL || memf != NULL)
 236                 setgid(getgid());
 237
 238         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf)) == NULL)
 239                 errx(1, "%s", buf);
 240 #ifdef notdef
 241         if (kvm_nlist(kd, nl) != 0)
 242                 errx(1, "no namelist: %s", kvm_geterr(kd));
 243 #endif
 244         if ((p = kvm_getprocs(kd, what, arg, &cnt)) == NULL)
 245                 errx(1, "%s", kvm_geterr(kd));
 246         if (nflg)
 247                 printf("USER     %-*.*s %*.*s   FD DEV              %*.*s MODE   SZ|DV R/W",
 248                         wflg_cmd, wflg_cmd, "CMD",
 249                         pid_width, pid_width, "PID",
 250                         ino_width, ino_width, "INUM");
 251         else
 252                 printf("USER     %-*.*s %*.*s   FD %-*.*s %*.*s MODE           SZ|DV R/W",
 253                         wflg_cmd, wflg_cmd, "CMD",
 254                         pid_width, pid_width, "PID",
 255                         wflg_mnt, wflg_mnt, "PATH",
 256                         ino_width, ino_width, "INUM");
 257         if (checkfile && fsflg == 0)
 258                 printf(" NAME\n");
 259         else
 260                 putchar('\n');
 261
 262         for (plast = &p[cnt]; p < plast; ++p) {
 263                 if (p->kp_stat == SZOMB)
 264                         continue;
 265                 if (!kread((void *)p->kp_paddr, &proc, sizeof(proc))) {
 266                         dprintf(stderr, "can't read proc at %p for pid %d\n",
 267                             (void *)p->kp_paddr, Pid);
 268                         continue;
 269                 }
 270                 dofiles(p, &proc);
 271                 if (mflg)
 272                         dommap(&proc);
 273         }
 274         exit(0);
 275 }
 276
 277 char    *Uname, *Comm;
 278 int     Pid;
 279
 280 #define PREFIX(i) \
 281         printf("%-8.8s %-*s %*d", Uname, wflg_cmd, Comm, pid_width, Pid); \
 282         switch(i) { \
 283         case TEXT: \
 284                 printf(" text"); \
 285                 break; \
 286         case CDIR: \
 287                 printf("   wd"); \
 288                 break; \
 289         case RDIR: \
 290                 printf(" root"); \
 291                 break; \
 292         case TRACE: \
 293                 printf("   tr"); \
 294                 break; \
 295         case MMAP: \
 296                 printf(" mmap"); \
 297                 break; \
 298         default: \
 299                 printf(" %4d", i); \
 300                 break; \
 301         }
 302
 303 /*
 304  * print open files attributed to this process
 305  */
 306 void
 307 dofiles(struct kinfo_proc *kp, struct proc *p)
 308 {
 309         int i;
 310         struct file file;
 311         struct filedesc filed;
 312         struct ktrace_node ktrace_node;
 313
 314         Uname = user_from_uid(kp->kp_uid, 0);
 315         Pid = kp->kp_pid;
 316         Comm = kp->kp_comm;
 317         make_printable(Comm, strlen(Comm));
 318
 319         if (p->p_fd == NULL)
 320                 return;
 321         if (!kread(p->p_fd, &filed, sizeof (filed))) {
 322                 dprintf(stderr, "can't read filedesc at %p for pid %d\n",
 323                     (void *)p->p_fd, Pid);
 324                 return;
 325         }
 326         /*
 327          * root directory vnode, if one
 328          */
 329         if (filed.fd_rdir)
 330                 vtrans(filed.fd_rdir, &filed.fd_nrdir, RDIR, FREAD);
 331         /*
 332          * current working directory vnode
 333          */
 334         vtrans(filed.fd_cdir, &filed.fd_ncdir, CDIR, FREAD);
 335         /*
 336          * ktrace vnode, if one
 337          */
 338         if (p->p_tracenode) {
 339                 if (kread(p->p_tracenode, &ktrace_node, sizeof (ktrace_node)))
 340                         vtrans(ktrace_node.kn_vp, NULL, TRACE, FREAD|FWRITE);
 341         }
 342         /*
 343          * text vnode, if one
 344          */
 345         if (p->p_textvp)
 346                 vtrans(p->p_textvp, NULL, TEXT, FREAD);
 347         /*
 348          * open files
 349          */
 350         ALLOC_OFILES(filed.fd_lastfile+1);
 351         if (!kread(filed.fd_files, ofiles,
 352             (filed.fd_lastfile+1) * sizeof(struct fdnode))) {
 353                 dprintf(stderr,
 354                     "can't read file structures at %p for pid %d\n",
 355                     (void *)filed.fd_files, Pid);
 356                 return;
 357         }
 358         for (i = 0; i <= filed.fd_lastfile; i++) {
 359                 if (ofiles[i].fp == NULL)
 360                         continue;
 361                 if (!kread(ofiles[i].fp, &file, sizeof (struct file))) {
 362                         dprintf(stderr, "can't read file %d at %p for pid %d\n",
 363                             i, (void *)ofiles[i].fp, Pid);
 364                         continue;
 365                 }
 366                 if (file.f_type == DTYPE_VNODE) {
 367                         vtrans((struct vnode *)file.f_data, &file.f_nchandle, i,
 368                                 file.f_flag);
 369                 } else if (file.f_type == DTYPE_SOCKET) {
 370                         if (checkfile == 0)
 371                                 socktrans((struct socket *)file.f_data, i);
 372                 }
 373 #ifdef DTYPE_PIPE
 374                 else if (file.f_type == DTYPE_PIPE) {
 375                         if (checkfile == 0)
 376                                 pipetrans((struct pipe *)file.f_data, i,
 377                                     file.f_flag);
 378                 }
 379 #endif
 380 #ifdef DTYPE_FIFO
 381                 else if (file.f_type == DTYPE_FIFO) {
 382                         if (checkfile == 0)
 383                                 vtrans((struct vnode *)file.f_data, &file.f_nchandle,
 384                                         i, file.f_flag);
 385                 }
 386 #endif
 387                 else {
 388                         dprintf(stderr,
 389                             "unknown file type %d for file %d of pid %d\n",
 390                             file.f_type, i, Pid);
 391                 }
 392         }
 393 }
 394
 395 void
 396 dommap(struct proc *p)
 397 {
 398         struct vmspace vmspace;
 399         vm_map_t map;
 400         struct vm_map_entry entry;
 401         vm_map_entry_t entryp;
 402         struct vm_object object;
 403         vm_object_t objp;
 404         int prot, fflags;
 405
 406         if (!kread(p->p_vmspace, &vmspace, sizeof(vmspace))) {
 407                 dprintf(stderr, "can't read vmspace at %p for pid %d\n",
 408                     (void *)p->p_vmspace, Pid);
 409                 return;
 410         }
 411
 412         map = &vmspace.vm_map;
 413
 414         for (entryp = map->header.next; entryp != &p->p_vmspace->vm_map.header;
 415             entryp = entry.next) {
 416                 if (!kread(entryp, &entry, sizeof(entry))) {
 417                         dprintf(stderr,
 418                             "can't read vm_map_entry at %p for pid %d\n",
 419                             (void *)entryp, Pid);
 420                         return;
 421                 }
 422
 423                 if (entry.maptype == VM_MAPTYPE_SUBMAP)
 424                         continue;
 425
 426                 if ((objp = entry.object.vm_object) == NULL)
 427                         continue;
 428
 429                 for (; objp; objp = object.backing_object) {
 430                         if (!kread(objp, &object, sizeof(object))) {
 431                                 dprintf(stderr,
 432                                     "can't read vm_object at %p for pid %d\n",
 433                                     (void *)objp, Pid);
 434                                 return;
 435                         }
 436                 }
 437
 438                 prot = entry.protection;
 439                 fflags = (prot & VM_PROT_READ ? FREAD : 0) |
 440                     (prot & VM_PROT_WRITE ? FWRITE : 0);
 441
 442                 switch (object.type) {
 443                 case OBJT_VNODE:
 444                         vtrans((struct vnode *)object.handle, NULL,
 445                                 MMAP, fflags);
 446                         break;
 447                 default:
 448                         break;
 449                 }
 450         }
 451 }
 452
 453 void
 454 vtrans(struct vnode *vp, struct nchandle *ncr, int i, int flag)
 455 {
 456         struct vnode vn;
 457         struct filestat fst;
 458         char rw[3], mode[15];
 459         const char *badtype = NULL, *filename;
 460
 461         filename = badtype = NULL;
 462         if (!kread(vp, &vn, sizeof (struct vnode))) {
 463                 dprintf(stderr, "can't read vnode at %p for pid %d\n",
 464                     (void *)vp, Pid);
 465                 return;
 466         }
 467         if (vn.v_type == VNON || vn.v_tag == VT_NON)
 468                 badtype = "none";
 469         else if (vn.v_type == VBAD)
 470                 badtype = "bad";
 471         else
 472                 switch (vn.v_tag) {
 473                 case VT_UFS:
 474                         if (!ufs_filestat(&vn, &fst))
 475                                 badtype = "error";
 476                         break;
 477                 case VT_MFS:
 478                         if (!ufs_filestat(&vn, &fst))
 479                                 badtype = "error";
 480                         break;
 481                 case VT_NFS:
 482                         if (!nfs_filestat(&vn, &fst))
 483                                 badtype = "error";
 484                         break;
 485
 486                 case VT_MSDOSFS:
 487                         if (!msdosfs_filestat(&vn, &fst))
 488                                 badtype = "error";
 489                         break;
 490
 491                 case VT_ISOFS:
 492                         if (!isofs_filestat(&vn, &fst))
 493                                 badtype = "error";
 494                         break;
 495
 496                 default: {
 497                         static char unknown[10];
 498                         sprintf(unknown, "?(%x)", vn.v_tag);
 499                         badtype=unknown;
 500                         break;
 501                 }
 502         }
 503         if (checkfile) {
 504                 int fsmatch = 0;
 505                 DEVS *d;
 506
 507                 if (badtype)
 508                         return;
 509                 for (d = devs; d != NULL; d = d->next)
 510                         if (d->fsid == fst.fsid) {
 511                                 fsmatch = 1;
 512                                 if (d->ino == (ino_t)fst.fileid) {
 513                                         filename = d->name;
 514                                         break;
 515                                 }
 516                         }
 517                 if (fsmatch == 0 || (filename == NULL && fsflg == 0))
 518                         return;
 519         }
 520         PREFIX(i);
 521         if (badtype) {
 522                 (void)printf(" %-*s  %10s    -\n",
 523                              wflg_mnt,
 524                              getmnton(vn.v_mount, &vn.v_namecache, ncr),
 525                              badtype);
 526                 return;
 527         }
 528         if (nflg)
 529                 (void)printf(" %3d,%-9d   ", major(fst.fsid), minor(fst.fsid));
 530         else
 531                 (void)printf(" %-*s", wflg_mnt, getmnton(vn.v_mount, &vn.v_namecache, ncr));
 532         if (nflg)
 533                 (void)sprintf(mode, "%o", fst.mode);
 534         else
 535                 strmode(fst.mode, mode);
 536         (void)printf(" %*ld %10s", ino_width, fst.fileid, mode);
 537         switch (vn.v_type) {
 538         case VBLK:
 539         case VCHR: {
 540                 char *name;
 541
 542                 if (nflg || ((name = devname(fst.rdev, vn.v_type == VCHR ?
 543                     S_IFCHR : S_IFBLK)) == NULL))
 544                         printf(" %3d,%-4d", major(fst.rdev), minor(fst.rdev));
 545                 else
 546                         printf(" %8s", name);
 547                 break;
 548         }
 549         default:
 550                 printf(" %8llu", fst.size);
 551         }
 552         rw[0] = '\0';
 553         if (flag & FREAD)
 554                 strcat(rw, "r");
 555         if (flag & FWRITE)
 556                 strcat(rw, "w");
 557         printf(" %2s", rw);
 558         if (filename && !fsflg)
 559                 printf("  %s", filename);
 560         putchar('\n');
 561 }
 562
 563 int
 564 ufs_filestat(struct vnode *vp, struct filestat *fsp)
 565 {
 566         struct inode inode;
 567
 568         if (!kread(VTOI(vp), &inode, sizeof (inode))) {
 569                 dprintf(stderr, "can't read inode at %p for pid %d\n",
 570                     (void *)VTOI(vp), Pid);
 571                 return 0;
 572         }
 573         /*
 574          * The st_dev from stat(2) is a udev_t. These kernel structures
 575          * contain dev_t structures. We need to convert to udev to make
 576          * comparisons
 577          */
 578         fsp->fsid = dev2udev(inode.i_dev);
 579         fsp->fileid = (long)inode.i_number;
 580         fsp->mode = (mode_t)inode.i_mode;
 581         fsp->size = inode.i_size;
 582         fsp->rdev = inode.i_rdev;
 583
 584         return 1;
 585 }
 586
 587 int
 588 nfs_filestat(struct vnode *vp, struct filestat *fsp)
 589 {
 590         struct nfsnode nfsnode;
 591         mode_t mode;
 592
 593         if (!kread(VTONFS(vp), &nfsnode, sizeof (nfsnode))) {
 594                 dprintf(stderr, "can't read nfsnode at %p for pid %d\n",
 595                     (void *)VTONFS(vp), Pid);
 596                 return 0;
 597         }
 598         fsp->fsid = nfsnode.n_vattr.va_fsid;
 599         fsp->fileid = nfsnode.n_vattr.va_fileid;
 600         fsp->size = nfsnode.n_size;
 601         fsp->rdev = makeudev(nfsnode.n_vattr.va_rmajor,
 602                              nfsnode.n_vattr.va_rminor);
 603         mode = (mode_t)nfsnode.n_vattr.va_mode;
 604         switch (vp->v_type) {
 605         case VREG:
 606                 mode |= S_IFREG;
 607                 break;
 608         case VDIR:
 609                 mode |= S_IFDIR;
 610                 break;
 611         case VBLK:
 612                 mode |= S_IFBLK;
 613                 break;
 614         case VCHR:
 615                 mode |= S_IFCHR;
 616                 break;
 617         case VLNK:
 618                 mode |= S_IFLNK;
 619                 break;
 620         case VSOCK:
 621                 mode |= S_IFSOCK;
 622                 break;
 623         case VFIFO:
 624                 mode |= S_IFIFO;
 625                 break;
 626         case VDATABASE:
 627                 break;
 628         case VNON:
 629         case VBAD:
 630                 return 0;
 631         };
 632         fsp->mode = mode;
 633
 634         return 1;
 635 }
 636
 637
 638 char *
 639 getmnton(struct mount *m, struct namecache_list *ncplist, struct nchandle *ncr)
 640 {
 641         static struct mount mount_l;
 642         static struct mtab {
 643                 struct mtab *next;
 644                 struct mount *m;
 645                 char mntonname[MNAMELEN];
 646         } *mhead = NULL;
 647         struct mtab *mt;
 648         struct namecache *ncp;
 649         struct namecache ncp_copy;
 650         static char path[1024];
 651         int i;
 652
 653         /*
 654          * If no ncp is passed try to find one via ncplist.
 655          */
 656         if (ncr == NULL || ncr->ncp == NULL) {
 657                 ncp = ncplist->tqh_first;
 658         } else {
 659                 ncp = ncr->ncp;
 660         }
 661
 662         /*
 663          * If we have an ncp, traceback the path.  This is a kvm pointer.
 664          */
 665         if (ncp) {
 666                 if (!kread(m, &mount_l, sizeof(struct mount))) {
 667                         warnx("can't read mount table at %p", (void *)m);
 668                         return (NULL);
 669                 }
 670                 i = sizeof(path) - 1;
 671                 path[i] = 0;
 672                 while (ncp) {
 673                         /*
 674                          * If this is the root of the mount then traverse
 675                          * to the parent mount.
 676                          */
 677                         if (ncp == mount_l.mnt_ncmountpt.ncp) {
 678                                 ncp = mount_l.mnt_ncmounton.ncp;
 679                                 if (ncp == NULL)
 680                                         break;
 681                                 m = mount_l.mnt_ncmounton.mount;
 682                                 if (!kread(m, &mount_l, sizeof(struct mount))) {
 683                                         warnx("can't read mount table at %p", (void *)m);
 684                                         return (NULL);
 685                                 }
 686                         }
 687
 688                         /*
 689                          * Ok, pull out the ncp and extract the name
 690                          */
 691                         if (!kread(ncp, &ncp_copy, sizeof(ncp_copy))) {
 692                                 warnx("can't read ncp at %p", ncp);
 693                                 return (NULL);
 694                         }
 695                         if (i <= ncp_copy.nc_nlen)
 696                                 break;
 697                         i -= ncp_copy.nc_nlen;
 698                         if (!kread(ncp_copy.nc_name, path + i, ncp_copy.nc_nlen)) {
 699                                 warnx("can't read ncp %p path component at %p", ncp, ncp_copy.nc_name);
 700                                 return (NULL);
 701                         }
 702                         make_printable(path + i, ncp_copy.nc_nlen);
 703                         path[--i] = '/';
 704                         ncp = ncp_copy.nc_parent;
 705                 }
 706                 if (i == sizeof(path) - 1)
 707                         path[--i] = '/';
 708                 return(path + i);
 709         }
 710
 711         /*
 712          * If all else fails print out the mount point path
 713          */
 714         for (mt = mhead; mt != NULL; mt = mt->next) {
 715                 if (m == mt->m)
 716                         return (mt->mntonname);
 717         }
 718         if (!kread(m, &mount_l, sizeof(struct mount))) {
 719                 warnx("can't read mount table at %p", (void *)m);
 720                 return (NULL);
 721         }
 722         if ((mt = malloc(sizeof (struct mtab))) == NULL)
 723                 err(1, NULL);
 724         mt->m = m;
 725         bcopy(&mount_l.mnt_stat.f_mntonname[0], &mt->mntonname[0], MNAMELEN);
 726         mt->next = mhead;
 727         mhead = mt;
 728         return (mt->mntonname);
 729 }
 730
 731 void
 732 pipetrans(struct pipe *pi, int i, int flag)
 733 {
 734         struct pipe pip;
 735         char rw[3];
 736
 737         PREFIX(i);
 738
 739         /* fill in socket */
 740         if (!kread(pi, &pip, sizeof(struct pipe))) {
 741                 dprintf(stderr, "can't read pipe at %p\n", (void *)pi);
 742                 goto bad;
 743         }
 744
 745         printf("* pipe %8lx <-> %8lx", (u_long)pi, (u_long)pip.pipe_peer);
 746         printf(" %6d", (int)(pip.pipe_buffer.windex - pip.pipe_buffer.rindex));
 747         rw[0] = '\0';
 748         if (flag & FREAD)
 749                 strcat(rw, "r");
 750         if (flag & FWRITE)
 751                 strcat(rw, "w");
 752         printf(" %2s", rw);
 753         putchar('\n');
 754         return;
 755
 756 bad:
 757         printf("* error\n");
 758 }
 759
 760 void
 761 socktrans(struct socket *sock, int i)
 762 {
 763         static const char *stypename[] = {
 764                 "unused",       /* 0 */
 765                 "stream",       /* 1 */
 766                 "dgram",        /* 2 */
 767                 "raw",          /* 3 */
 768                 "rdm",          /* 4 */
 769                 "seqpak"        /* 5 */
 770         };
 771 #define STYPEMAX 5
 772         struct socket   so;
 773         struct protosw  proto;
 774         struct domain   dom;
 775         struct inpcb    inpcb;
 776         struct unpcb    unpcb;
 777         int len;
 778         char dname[32];
 779
 780         PREFIX(i);
 781
 782         /* fill in socket */
 783         if (!kread(sock, &so, sizeof(struct socket))) {
 784                 dprintf(stderr, "can't read sock at %p\n", (void *)sock);
 785                 goto bad;
 786         }
 787
 788         /* fill in protosw entry */
 789         if (!kread(so.so_proto, &proto, sizeof(struct protosw))) {
 790                 dprintf(stderr, "can't read protosw at %p",
 791                     (void *)so.so_proto);
 792                 goto bad;
 793         }
 794
 795         /* fill in domain */
 796         if (!kread(proto.pr_domain, &dom, sizeof(struct domain))) {
 797                 dprintf(stderr, "can't read domain at %p\n",
 798                     (const void *)proto.pr_domain);
 799                 goto bad;
 800         }
 801
 802         if ((len = kvm_read(kd, (u_long)dom.dom_name, dname,
 803             sizeof(dname) - 1)) < 0) {
 804                 dprintf(stderr, "can't read domain name at %p\n",
 805                     (void *)dom.dom_name);
 806                 dname[0] = '\0';
 807         }
 808         else
 809                 dname[len] = '\0';
 810
 811         if ((u_short)so.so_type > STYPEMAX)
 812                 printf("* %s ?%d", dname, so.so_type);
 813         else
 814                 printf("* %s %s", dname, stypename[so.so_type]);
 815
 816         /*
 817          * protocol specific formatting
 818          *
 819          * Try to find interesting things to print.  For tcp, the interesting
 820          * thing is the address of the tcpcb, for udp and others, just the
 821          * inpcb (socket pcb).  For unix domain, its the address of the socket
 822          * pcb and the address of the connected pcb (if connected).  Otherwise
 823          * just print the protocol number and address of the socket itself.
 824          * The idea is not to duplicate netstat, but to make available enough
 825          * information for further analysis.
 826          */
 827         switch(dom.dom_family) {
 828         case AF_INET:
 829         case AF_INET6:
 830                 getinetproto(proto.pr_protocol);
 831                 if (proto.pr_protocol == IPPROTO_TCP ) {
 832                         if (so.so_pcb) {
 833                                 if (kvm_read(kd, (u_long)so.so_pcb,
 834                                     (char *)&inpcb, sizeof(struct inpcb))
 835                                     != sizeof(struct inpcb)) {
 836                                         dprintf(stderr,
 837                                             "can't read inpcb at %p\n",
 838                                             (void *)so.so_pcb);
 839                                         goto bad;
 840                                 }
 841                                 printf(" %lx", (u_long)inpcb.inp_ppcb);
 842                         }
 843                 }
 844                 else if (so.so_pcb)
 845                         printf(" %lx", (u_long)so.so_pcb);
 846                 break;
 847         case AF_UNIX:
 848                 /* print address of pcb and connected pcb */
 849                 if (so.so_pcb) {
 850                         printf(" %lx", (u_long)so.so_pcb);
 851                         if (kvm_read(kd, (u_long)so.so_pcb, (char *)&unpcb,
 852                             sizeof(struct unpcb)) != sizeof(struct unpcb)){
 853                                 dprintf(stderr, "can't read unpcb at %p\n",
 854                                     (void *)so.so_pcb);
 855                                 goto bad;
 856                         }
 857                         if (unpcb.unp_conn) {
 858                                 char shoconn[4], *cp;
 859
 860                                 cp = shoconn;
 861                                 if (!(so.so_state & SS_CANTRCVMORE))
 862                                         *cp++ = '<';
 863                                 *cp++ = '-';
 864                                 if (!(so.so_state & SS_CANTSENDMORE))
 865                                         *cp++ = '>';
 866                                 *cp = '\0';
 867                                 printf(" %s %lx", shoconn,
 868                                     (u_long)unpcb.unp_conn);
 869                         }
 870                 }
 871                 break;
 872         default:
 873                 /* print protocol number and socket address */
 874                 printf(" %d %lx", proto.pr_protocol, (u_long)sock);
 875         }
 876         printf("\n");
 877         return;
 878 bad:
 879         printf("* error\n");
 880 }
 881
 882
 883 /*
 884  * Read the cdev structure in the kernel (as pointed to by a dev_t)
 885  * in order to work out the associated udev_t
 886  */
 887 udev_t
 888 dev2udev(void *dev)
 889 {
 890         struct cdev si;
 891
 892         if (kread(dev, &si, sizeof si)) {
 893                 if ((si.si_umajor & 0xffffff00) ||
 894                     (si.si_uminor & 0x0000ff00)) {
 895                         return NOUDEV;
 896                 }
 897                 return((si.si_umajor << 8) | si.si_uminor);
 898         } else {
 899                 dprintf(stderr, "can't convert dev_t %p to a udev_t\n", dev);
 900                 return NOUDEV;
 901         }
 902 }
 903
 904 udev_t
 905 makeudev(int x, int y)
 906 {
 907         if ((x & 0xffffff00) || (y & 0x0000ff00))
 908                 return NOUDEV;
 909         return ((x << 8) | y);
 910 }
 911
 912 /*
 913  * getinetproto --
 914  *      print name of protocol number
 915  */
 916 void
 917 getinetproto(int number)
 918 {
 919         static int isopen;
 920         struct protoent *pe;
 921
 922         if (!isopen)
 923                 setprotoent(++isopen);
 924         if ((pe = getprotobynumber(number)) != NULL)
 925                 printf(" %s", pe->p_name);
 926         else
 927                 printf(" %d", number);
 928 }
 929
 930 int
 931 getfname(const char *filename)
 932 {
 933         struct stat statbuf;
 934         DEVS *cur;
 935
 936         if (stat(filename, &statbuf)) {
 937                 warn("%s", filename);
 938                 return(0);
 939         }
 940         if ((cur = malloc(sizeof(DEVS))) == NULL)
 941                 err(1, NULL);
 942         cur->next = devs;
 943         devs = cur;
 944
 945         cur->ino = statbuf.st_ino;
 946         cur->fsid = statbuf.st_dev;
 947         cur->name = filename;
 948         return(1);
 949 }
 950
 951 void
 952 usage(void)
 953 {
 954         (void)fprintf(stderr,
 955  "usage: fstat [-fmnv] [-p pid] [-u user] [-N system] [-M core] [file ...]\n");
 956         exit(1);
 957 }
 958
 959 static
 960 void
 961 make_printable(char *buf, int len)
 962 {
 963     while (len > 0) {
 964         if (!isprint(*buf))
 965                 *buf = '?';
 966         ++buf;
 967         --len;
 968     }
 969 }
 970
 971 ssize_t
 972 kread(const void *kaddr, void *uaddr, size_t nbytes)
 973 {
 974     if (nbytes > 0x10000000)
 975         return(0);
 976
 977     if (kvm_read(kd, (u_long)kaddr, (char *)uaddr, nbytes) == (ssize_t)nbytes)
 978         return(1);
 979     else
 980         return(0);
 981 }
 982