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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)fstat.c  8.3 (Berkeley) 5/2/95
  31  * $FreeBSD: src/usr.bin/fstat/fstat.c,v 1.21.2.7 2001/11/21 10:49:37 dwmalone Exp $
  32  */
  33
  34 #include <sys/user.h>
  35 #include <sys/param.h>
  36 #include <sys/time.h>
  37 #include <sys/stat.h>
  38 #include <sys/vnode.h>
  39 #include <sys/socket.h>
  40 #include <sys/socketvar.h>
  41 #include <sys/domain.h>
  42 #include <sys/protosw.h>
  43 #include <sys/un.h>
  44 #include <sys/unpcb.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/filedesc.h>
  47 #include <sys/queue.h>
  48 #include <sys/pipe.h>
  49 #include <sys/conf.h>
  50 #include <sys/file.h>
  51 #include <sys/ktrace.h>
  52 #include <vfs/ufs/quota.h>
  53 #include <vfs/ufs/inode.h>
  54 #include <sys/mount.h>
  55 #include <sys/namecache.h>
  56 #include <nfs/nfsproto.h>
  57 #include <nfs/rpcv2.h>
  58 #include <nfs/nfs.h>
  59 #include <nfs/nfsnode.h>
  60 #include <sys/devfs.h>
  61
  62 #include <vm/vm.h>
  63 #include <vm/vm_map.h>
  64 #include <vm/vm_object.h>
  65
  66 #include <net/route.h>
  67 #include <netinet/in.h>
  68 #include <netinet/in_systm.h>
  69 #include <netinet/ip.h>
  70 #include <netinet/in_pcb.h>
  71
  72 #include <ctype.h>
  73 #include <err.h>
  74 #include <fcntl.h>
  75 #include <kvm.h>
  76 #include <limits.h>
  77 #include <nlist.h>
  78 #include <paths.h>
  79 #include <pwd.h>
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #include <unistd.h>
  84 #include <netdb.h>
  85
  86 #include "fstat.h"
  87
  88 #define TEXT    -1
  89 #define CDIR    -2
  90 #define RDIR    -3
  91 #define TRACE   -4
  92 #define MMAP    -5
  93
  94 DEVS *devs;
  95
  96 static void make_printable(char *buf, int len);
  97
  98 #ifdef notdef
  99 struct nlist nl[] = {
 100         { "" },
 101 };
 102 #endif
 103
 104 int     fsflg,  /* show files on same filesystem as file(s) argument */
 105         pflg,   /* show files open by a particular pid */
 106         uflg;   /* show files open by a particular (effective) user */
 107 int     checkfile; /* true if restricting to particular files or filesystems */
 108 int     nflg;   /* (numerical) display f.s. and rdev as dev_t */
 109 int     vflg;   /* display errors in locating kernel data objects etc... */
 110 int     mflg;   /* include memory-mapped files */
 111 int     wflg_mnt = 16;
 112 int     wflg_cmd = 10;
 113 int     pid_width = 5;
 114 int     ino_width = 6;
 115
 116 struct fdnode *ofiles;  /* buffer of pointers to file structures */
 117 int maxfiles;
 118
 119 #define ALLOC_OFILES(d) \
 120         if ((d) > maxfiles) { \
 121                 free(ofiles); \
 122                 ofiles = malloc((d) * sizeof(struct fdnode)); \
 123                 if (ofiles == NULL) { \
 124                         err(1, NULL); \
 125                 } \
 126                 maxfiles = (d); \
 127         }
 128
 129 kvm_t *kd;
 130
 131 static void dofiles(struct kinfo_proc *, struct proc *);
 132 static void dommap(struct proc *);
 133 static void vtrans(struct vnode *, struct nchandle *, int, int, off_t);
 134 static int  ufs_filestat(struct vnode *, struct filestat *);
 135 static int  nfs_filestat(struct vnode *, struct filestat *);
 136 static int  devfs_filestat(struct vnode *, struct filestat *);
 137 static char *getmnton(struct mount *, struct namecache_list *, struct nchandle *);
 138 static void pipetrans(struct pipe *, int, int);
 139 static void socktrans(struct socket *, int);
 140 static void getinetproto(int);
 141 static int  getfname(const char *);
 142 static void usage(void) __dead2;
 143
 144
 145 int
 146 main(int argc, char **argv)
 147 {
 148         struct passwd *passwd;
 149         struct kinfo_proc *p, *plast;
 150         struct proc proc;
 151         int arg, ch, what;
 152         char *memf, *nlistf;
 153         char buf[_POSIX2_LINE_MAX];
 154         int cnt;
 155
 156         arg = 0;
 157         what = KERN_PROC_ALL;
 158         nlistf = memf = NULL;
 159         while ((ch = getopt(argc, argv, "fmnp:u:vwN:M:")) != -1)
 160                 switch((char)ch) {
 161                 case 'f':
 162                         fsflg = 1;
 163                         break;
 164                 case 'M':
 165                         memf = optarg;
 166                         break;
 167                 case 'N':
 168                         nlistf = optarg;
 169                         break;
 170                 case 'm':
 171                         mflg = 1;
 172                         break;
 173                 case 'n':
 174                         nflg = 1;
 175                         break;
 176                 case 'p':
 177                         if (pflg++)
 178                                 usage();
 179                         if (!isdigit(*optarg)) {
 180                                 warnx("-p requires a process id");
 181                                 usage();
 182                         }
 183                         what = KERN_PROC_PID;
 184                         arg = atoi(optarg);
 185                         break;
 186                 case 'u':
 187                         if (uflg++)
 188                                 usage();
 189                         if (!(passwd = getpwnam(optarg)))
 190                                 errx(1, "%s: unknown uid", optarg);
 191                         what = KERN_PROC_UID;
 192                         arg = passwd->pw_uid;
 193                         break;
 194                 case 'v':
 195                         vflg = 1;
 196                         break;
 197                 case 'w':
 198                         wflg_mnt = 40;
 199                         wflg_cmd = 16;
 200                         break;
 201                 case '?':
 202                 default:
 203                         usage();
 204                 }
 205
 206         if (*(argv += optind)) {
 207                 for (; *argv; ++argv) {
 208                         if (getfname(*argv))
 209                                 checkfile = 1;
 210                 }
 211                 if (!checkfile) /* file(s) specified, but none accessable */
 212                         exit(1);
 213         }
 214
 215         ALLOC_OFILES(256);      /* reserve space for file pointers */
 216
 217         if (fsflg && !checkfile) {
 218                 /* -f with no files means use wd */
 219                 if (getfname(".") == 0)
 220                         exit(1);
 221                 checkfile = 1;
 222         }
 223
 224         /*
 225          * Discard setgid privileges if not the running kernel so that bad
 226          * guys can't print interesting stuff from kernel memory.
 227          */
 228         if (nlistf != NULL || memf != NULL)
 229                 setgid(getgid());
 230
 231         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf)) == NULL)
 232                 errx(1, "%s", buf);
 233 #ifdef notdef
 234         if (kvm_nlist(kd, nl) != 0)
 235                 errx(1, "no namelist: %s", kvm_geterr(kd));
 236 #endif
 237         if ((p = kvm_getprocs(kd, what, arg, &cnt)) == NULL)
 238                 errx(1, "%s", kvm_geterr(kd));
 239         if (nflg)
 240                 printf("USER     %-*.*s %*.*s   FD DEV              %*.*s MODE   SZ|DV R/W",
 241                         wflg_cmd, wflg_cmd, "CMD",
 242                         pid_width, pid_width, "PID",
 243                         ino_width, ino_width, "INUM");
 244         else
 245                 printf("USER     %-*.*s %*.*s   FD %-*.*s %*.*s MODE           SZ|DV R/W",
 246                         wflg_cmd, wflg_cmd, "CMD",
 247                         pid_width, pid_width, "PID",
 248                         wflg_mnt, wflg_mnt, "PATH",
 249                         ino_width, ino_width, "INUM");
 250         if (checkfile && fsflg == 0)
 251                 printf(" NAME\n");
 252         else
 253                 putchar('\n');
 254
 255         for (plast = &p[cnt]; p < plast; ++p) {
 256                 if (p->kp_stat == SZOMB)
 257                         continue;
 258                 if (!kread((void *)p->kp_paddr, &proc, sizeof(proc))) {
 259                         dprintf(stderr, "can't read proc at %p for pid %d\n",
 260                             (void *)p->kp_paddr, Pid);
 261                         continue;
 262                 }
 263                 dofiles(p, &proc);
 264                 if (mflg)
 265                         dommap(&proc);
 266         }
 267         exit(0);
 268 }
 269
 270 const char *Uname;
 271 char    *Comm;
 272 int     Pid;
 273
 274 #define PREFIX(i) \
 275         printf("%-8.8s %-*s %*d", Uname, wflg_cmd, Comm, pid_width, Pid); \
 276         switch(i) { \
 277         case TEXT: \
 278                 printf(" text"); \
 279                 break; \
 280         case CDIR: \
 281                 printf("   wd"); \
 282                 break; \
 283         case RDIR: \
 284                 printf(" root"); \
 285                 break; \
 286         case TRACE: \
 287                 printf("   tr"); \
 288                 break; \
 289         case MMAP: \
 290                 printf(" mmap"); \
 291                 break; \
 292         default: \
 293                 printf(" %4d", i); \
 294                 break; \
 295         }
 296
 297 /*
 298  * print open files attributed to this process
 299  */
 300 static void
 301 dofiles(struct kinfo_proc *kp, struct proc *p)
 302 {
 303         int i;
 304         struct file file;
 305         struct filedesc filed;
 306         struct ktrace_node ktrace_node;
 307
 308         Uname = user_from_uid(kp->kp_uid, 0);
 309         Pid = kp->kp_pid;
 310         Comm = kp->kp_comm;
 311         make_printable(Comm, strlen(Comm));
 312
 313         if (p->p_fd == NULL)
 314                 return;
 315         if (!kread(p->p_fd, &filed, sizeof (filed))) {
 316                 dprintf(stderr, "can't read filedesc at %p for pid %d\n",
 317                     (void *)p->p_fd, Pid);
 318                 return;
 319         }
 320         /*
 321          * root directory vnode, if one
 322          */
 323         if (filed.fd_rdir)
 324                 vtrans(filed.fd_rdir, &filed.fd_nrdir, RDIR, FREAD, 0);
 325         /*
 326          * current working directory vnode
 327          */
 328         vtrans(filed.fd_cdir, &filed.fd_ncdir, CDIR, FREAD, 0);
 329         /*
 330          * ktrace vnode, if one
 331          */
 332         if (p->p_tracenode) {
 333                 if (kread(p->p_tracenode, &ktrace_node, sizeof (ktrace_node)))
 334                         vtrans(ktrace_node.kn_vp, NULL, TRACE, FREAD|FWRITE, 0);
 335         }
 336         /*
 337          * text vnode, if one
 338          */
 339         if (p->p_textvp)
 340                 vtrans(p->p_textvp, NULL, TEXT, FREAD, 0);
 341         /*
 342          * open files
 343          */
 344         ALLOC_OFILES(filed.fd_lastfile+1);
 345         if (!kread(filed.fd_files, ofiles,
 346             (filed.fd_lastfile+1) * sizeof(struct fdnode))) {
 347                 dprintf(stderr,
 348                     "can't read file structures at %p for pid %d\n",
 349                     (void *)filed.fd_files, Pid);
 350                 return;
 351         }
 352         for (i = 0; i <= filed.fd_lastfile; i++) {
 353                 if (ofiles[i].fp == NULL)
 354                         continue;
 355                 if (!kread(ofiles[i].fp, &file, sizeof (struct file))) {
 356                         dprintf(stderr, "can't read file %d at %p for pid %d\n",
 357                             i, (void *)ofiles[i].fp, Pid);
 358                         continue;
 359                 }
 360                 if (file.f_type == DTYPE_VNODE) {
 361                         vtrans((struct vnode *)file.f_data, &file.f_nchandle,
 362                                 i, file.f_flag, file.f_offset);
 363                 } else if (file.f_type == DTYPE_SOCKET) {
 364                         if (checkfile == 0)
 365                                 socktrans((struct socket *)file.f_data, i);
 366                 }
 367 #ifdef DTYPE_PIPE
 368                 else if (file.f_type == DTYPE_PIPE) {
 369                         if (checkfile == 0)
 370                                 pipetrans((struct pipe *)file.f_data, i,
 371                                     file.f_flag);
 372                 }
 373 #endif
 374 #ifdef DTYPE_FIFO
 375                 else if (file.f_type == DTYPE_FIFO) {
 376                         if (checkfile == 0)
 377                                 vtrans((struct vnode *)file.f_data,
 378                                         &file.f_nchandle,
 379                                         i, file.f_flag, file.f_offset);
 380                 }
 381 #endif
 382                 else {
 383                         dprintf(stderr,
 384                             "unknown file type %d for file %d of pid %d\n",
 385                             file.f_type, i, Pid);
 386                 }
 387         }
 388 }
 389
 390 static void
 391 dommap(struct proc *p)
 392 {
 393         struct vmspace vmspace;
 394         vm_map_t map;
 395         struct vm_map_entry entry;
 396         vm_map_entry_t entryp;
 397         struct vm_object object;
 398         vm_object_t objp;
 399         int prot, fflags;
 400
 401         if (!kread(p->p_vmspace, &vmspace, sizeof(vmspace))) {
 402                 dprintf(stderr, "can't read vmspace at %p for pid %d\n",
 403                     (void *)p->p_vmspace, Pid);
 404                 return;
 405         }
 406
 407         map = &vmspace.vm_map;
 408
 409         for (entryp = map->header.next; entryp != &p->p_vmspace->vm_map.header;
 410             entryp = entry.next) {
 411                 if (!kread(entryp, &entry, sizeof(entry))) {
 412                         dprintf(stderr,
 413                             "can't read vm_map_entry at %p for pid %d\n",
 414                             (void *)entryp, Pid);
 415                         return;
 416                 }
 417
 418                 if (entry.maptype == VM_MAPTYPE_SUBMAP)
 419                         continue;
 420
 421                 if ((objp = entry.object.vm_object) == NULL)
 422                         continue;
 423
 424                 for (; objp; objp = object.backing_object) {
 425                         if (!kread(objp, &object, sizeof(object))) {
 426                                 dprintf(stderr,
 427                                     "can't read vm_object at %p for pid %d\n",
 428                                     (void *)objp, Pid);
 429                                 return;
 430                         }
 431                 }
 432
 433                 prot = entry.protection;
 434                 fflags = (prot & VM_PROT_READ ? FREAD : 0) |
 435                     (prot & VM_PROT_WRITE ? FWRITE : 0);
 436
 437                 switch (object.type) {
 438                 case OBJT_VNODE:
 439                         vtrans((struct vnode *)object.handle, NULL,
 440                                 MMAP, fflags, 0);
 441                         break;
 442                 default:
 443                         break;
 444                 }
 445         }
 446 }
 447
 448 static void
 449 vtrans(struct vnode *vp, struct nchandle *ncr, int i, int flag, off_t off)
 450 {
 451         struct vnode vn;
 452         struct filestat fst;
 453         char rw[3], mode[15];
 454         const char *badtype = NULL, *filename;
 455         char *name;
 456
 457         fst.offset = off;
 458         filename = badtype = NULL;
 459         if (!kread(vp, &vn, sizeof (struct vnode))) {
 460                 dprintf(stderr, "can't read vnode at %p for pid %d\n",
 461                     (void *)vp, Pid);
 462                 return;
 463         }
 464         if (vn.v_type == VNON || vn.v_tag == VT_NON)
 465                 badtype = "none";
 466         else if (vn.v_type == VBAD)
 467                 badtype = "bad";
 468         else
 469                 switch (vn.v_tag) {
 470                 case VT_HAMMER:
 471                         if (!hammer_filestat(&vn, &fst))
 472                                 badtype = "error";
 473                         break;
 474                 case VT_TMPFS:
 475                         if (!tmpfs_filestat(&vn, &fst))
 476                                 badtype = "error";
 477                         break;
 478                 case VT_UFS:
 479                         if (!ufs_filestat(&vn, &fst))
 480                                 badtype = "error";
 481                         break;
 482                 case VT_MFS:
 483                         if (!ufs_filestat(&vn, &fst))
 484                                 badtype = "error";
 485                         break;
 486                 case VT_NFS:
 487                         if (!nfs_filestat(&vn, &fst))
 488                                 badtype = "error";
 489                         break;
 490                 case VT_NTFS:
 491                         if (!ntfs_filestat(&vn, &fst))
 492                                 badtype = "error";
 493                         break;
 494                 case VT_EXT2FS:
 495                         if (!ext2fs_filestat(&vn, &fst))
 496                                 badtype = "error";
 497                         break;
 498
 499                 case VT_MSDOSFS:
 500                         if (!msdosfs_filestat(&vn, &fst))
 501                                 badtype = "error";
 502                         break;
 503
 504                 case VT_ISOFS:
 505                         if (!isofs_filestat(&vn, &fst))
 506                                 badtype = "error";
 507                         break;
 508
 509                 case VT_DEVFS:
 510                         if (!devfs_filestat(&vn, &fst))
 511                                 badtype = "error";
 512                         break;
 513
 514                 default: {
 515                         static char unknown[10];
 516                         sprintf(unknown, "?(%x)", vn.v_tag);
 517                         badtype=unknown;
 518                         break;
 519                 }
 520         }
 521         if (checkfile) {
 522                 int fsmatch = 0;
 523                 DEVS *d;
 524
 525                 if (badtype)
 526                         return;
 527                 for (d = devs; d != NULL; d = d->next)
 528                         if (d->fsid == fst.fsid) {
 529                                 fsmatch = 1;
 530                                 if (d->ino == (ino_t)fst.fileid) {
 531                                         filename = d->name;
 532                                         break;
 533                                 }
 534                         }
 535                 if (fsmatch == 0 || (filename == NULL && fsflg == 0))
 536                         return;
 537         }
 538         PREFIX(i);
 539         if (badtype) {
 540                 (void)printf(" %-*s  %10s    %jd\n",
 541                              wflg_mnt,
 542                              getmnton(vn.v_mount, &vn.v_namecache, ncr),
 543                              badtype,
 544                              (intmax_t)off);
 545                 return;
 546         }
 547         if (nflg)
 548                 printf(" %3u,%-9u   ",
 549                        major(fst.fsid), minor(fst.fsid));
 550         else
 551                 printf(" %-*s",
 552                        wflg_mnt, getmnton(vn.v_mount, &vn.v_namecache, ncr));
 553         if (nflg)
 554                 sprintf(mode, "%o", fst.mode);
 555         else
 556                 strmode(fst.mode, mode);
 557
 558         printf(" %*ld %10s", ino_width, fst.fileid, mode);
 559
 560         switch (vn.v_type) {
 561         case VBLK:
 562         case VCHR:
 563                 if (nflg || ((name = devname(fst.rdev, vn.v_type == VCHR ?
 564                     S_IFCHR : S_IFBLK)) == NULL))
 565                         printf(" %3u,%-4u", major(fst.rdev), minor(fst.rdev));
 566                 else
 567                         printf(" %8s", name);
 568                 break;
 569         case VREG:
 570                 printf(" %jd", (intmax_t)fst.offset);
 571                 break;
 572         default:
 573                 printf(" %8ju", (uintmax_t)fst.size);
 574         }
 575         rw[0] = '\0';
 576         if (flag & FREAD)
 577                 strcat(rw, "r");
 578         if (flag & FWRITE)
 579                 strcat(rw, "w");
 580         printf(" %2s", rw);
 581         if (filename && !fsflg)
 582                 printf("  %s", filename);
 583         putchar('\n');
 584 }
 585
 586 static int
 587 ufs_filestat(struct vnode *vp, struct filestat *fsp)
 588 {
 589         struct inode inode;
 590
 591         if (!kread(VTOI(vp), &inode, sizeof (inode))) {
 592                 dprintf(stderr, "can't read inode at %p for pid %d\n",
 593                     (void *)VTOI(vp), Pid);
 594                 return 0;
 595         }
 596         /*
 597          * The st_dev from stat(2) is a udev_t. These kernel structures
 598          * contain dev_t structures. We need to convert to udev to make
 599          * comparisons
 600          */
 601         fsp->fsid = dev2udev(inode.i_dev);
 602         fsp->fileid = (long)inode.i_number;
 603         fsp->mode = (mode_t)inode.i_mode;
 604         fsp->size = inode.i_size;
 605         fsp->rdev = inode.i_rdev;
 606
 607         return 1;
 608 }
 609
 610 static int
 611 nfs_filestat(struct vnode *vp, struct filestat *fsp)
 612 {
 613         struct nfsnode nfsnode;
 614
 615         if (!kread(VTONFS(vp), &nfsnode, sizeof (nfsnode))) {
 616                 dprintf(stderr, "can't read nfsnode at %p for pid %d\n",
 617                     (void *)VTONFS(vp), Pid);
 618                 return 0;
 619         }
 620         fsp->fsid = nfsnode.n_vattr.va_fsid;
 621         fsp->fileid = nfsnode.n_vattr.va_fileid;
 622         fsp->size = nfsnode.n_size;
 623         fsp->rdev = makeudev(nfsnode.n_vattr.va_rmajor,
 624                              nfsnode.n_vattr.va_rminor);
 625         fsp->mode = nfsnode.n_vattr.va_mode | mtrans(vp->v_type);
 626
 627         return 1;
 628 }
 629
 630 static int
 631 devfs_filestat(struct vnode *vp, struct filestat *fsp)
 632 {
 633         struct devfs_node devfs_node;
 634
 635         if (!kread(vp->v_data, &devfs_node, sizeof (devfs_node))) {
 636                 dprintf(stderr, "can't read devfs_node at %p for pid %d\n",
 637                     (void *)vp->v_data, Pid);
 638                 return 0;
 639         }
 640         fsp->fsid = fsp->rdev = dev2udev(vp->v_rdev);
 641         fsp->fileid = devfs_node.d_dir.d_ino;
 642         fsp->mode = (devfs_node.mode & ~S_IFMT) | S_IFCHR;
 643         fsp->size = 0;
 644
 645         return 1;
 646 }
 647
 648 static char *
 649 getmnton(struct mount *m, struct namecache_list *ncplist, struct nchandle *ncr)
 650 {
 651         static struct mount mount_l;
 652         static struct mtab {
 653                 struct mtab *next;
 654                 struct mount *m;
 655                 char mntonname[MNAMELEN];
 656         } *mhead = NULL;
 657         struct mtab *mt;
 658         struct namecache *ncp;
 659         struct namecache ncp_copy;
 660         static char path[1024];
 661         int i;
 662
 663         /*
 664          * If no ncp is passed try to find one via ncplist.  Make sure
 665          * we are using the correct mount pointer or the matching code
 666          * will not know how to transition mount points properly.
 667          */
 668         if (ncr == NULL || ncr->ncp == NULL) {
 669                 ncp = ncplist->tqh_first;
 670         } else {
 671                 ncp = ncr->ncp;
 672                 if (ncr->mount)
 673                         m = ncr->mount;
 674         }
 675
 676         /*
 677          * If we have an ncp, traceback the path.  This is a kvm pointer.
 678          */
 679         if (ncp) {
 680                 if (!kread(m, &mount_l, sizeof(struct mount))) {
 681                         warnx("can't read mount table at %p", (void *)m);
 682                         return (NULL);
 683                 }
 684                 i = sizeof(path) - 1;
 685                 path[i] = 0;
 686                 while (ncp) {
 687                         /*
 688                          * If this is the root of the mount then traverse
 689                          * to the parent mount.
 690                          */
 691                         if (ncp == mount_l.mnt_ncmountpt.ncp) {
 692                                 ncp = mount_l.mnt_ncmounton.ncp;
 693                                 if (ncp == NULL)
 694                                         break;
 695                                 m = mount_l.mnt_ncmounton.mount;
 696                                 if (!kread(m, &mount_l, sizeof(struct mount))) {
 697                                         warnx("can't read mount table at %p", (void *)m);
 698                                         return (NULL);
 699                                 }
 700                         }
 701
 702                         /*
 703                          * Ok, pull out the ncp and extract the name
 704                          */
 705                         if (!kread(ncp, &ncp_copy, sizeof(ncp_copy))) {
 706                                 warnx("can't read ncp at %p", ncp);
 707                                 return (NULL);
 708                         }
 709                         if (i <= ncp_copy.nc_nlen)
 710                                 break;
 711                         i -= ncp_copy.nc_nlen;
 712                         if (!kread(ncp_copy.nc_name, path + i, ncp_copy.nc_nlen)) {
 713                                 warnx("can't read ncp %p path component at %p", ncp, ncp_copy.nc_name);
 714                                 return (NULL);
 715                         }
 716                         make_printable(path + i, ncp_copy.nc_nlen);
 717                         path[--i] = '/';
 718                         ncp = ncp_copy.nc_parent;
 719                 }
 720                 if (i == sizeof(path) - 1)
 721                         path[--i] = '/';
 722                 return(path + i);
 723         }
 724
 725         /*
 726          * If all else fails print out the mount point path
 727          */
 728         for (mt = mhead; mt != NULL; mt = mt->next) {
 729                 if (m == mt->m)
 730                         return (mt->mntonname);
 731         }
 732         if (!kread(m, &mount_l, sizeof(struct mount))) {
 733                 warnx("can't read mount table at %p", (void *)m);
 734                 return (NULL);
 735         }
 736         if ((mt = malloc(sizeof (struct mtab))) == NULL)
 737                 err(1, NULL);
 738         mt->m = m;
 739         bcopy(&mount_l.mnt_stat.f_mntonname[0], &mt->mntonname[0], MNAMELEN);
 740         mt->next = mhead;
 741         mhead = mt;
 742         return (mt->mntonname);
 743 }
 744
 745 static void
 746 pipetrans(struct pipe *pi, int i, int flag)
 747 {
 748         struct pipe pip;
 749         struct pipebuf *b1;
 750         struct pipebuf *b2;
 751         char rw[3];
 752         char side1;
 753         char side2;
 754
 755         PREFIX(i);
 756         if ((intptr_t)pi & 1) {
 757                 side1 = 'B';
 758                 side2 = 'A';
 759                 b1 = &pip.bufferB;
 760                 b2 = &pip.bufferA;
 761         } else {
 762                 side1 = 'A';
 763                 side2 = 'B';
 764                 b1 = &pip.bufferA;
 765                 b2 = &pip.bufferB;
 766         }
 767         pi = (void *)((intptr_t)pi & ~(intptr_t)1);
 768
 769         /* fill in socket */
 770         if (!kread(pi, &pip, sizeof(struct pipe))) {
 771                 dprintf(stderr, "can't read pipe at %p\n", (void *)pi);
 772                 goto bad;
 773         }
 774
 775         printf("* pipe %8lx (%c<->%c)", (u_long)pi, side1, side2);
 776         printf(" ravail %-zd wavail %-zd",
 777                b1->windex - b1->rindex,
 778                b2->windex - b2->rindex);
 779         rw[0] = '\0';
 780         if (flag & FREAD)
 781                 strcat(rw, "r");
 782         if (flag & FWRITE)
 783                 strcat(rw, "w");
 784         printf(" %2s", rw);
 785         putchar('\n');
 786         return;
 787
 788 bad:
 789         printf("* error\n");
 790 }
 791
 792 static void
 793 socktrans(struct socket *sock, int i)
 794 {
 795         static const char *stypename[] = {
 796                 "unused",       /* 0 */
 797                 "stream",       /* 1 */
 798                 "dgram",        /* 2 */
 799                 "raw",          /* 3 */
 800                 "rdm",          /* 4 */
 801                 "seqpak"        /* 5 */
 802         };
 803 #define STYPEMAX 5
 804         struct socket   so;
 805         struct protosw  proto;
 806         struct domain   dom;
 807         struct inpcb    inpcb;
 808         struct unpcb    unpcb;
 809         int len;
 810         char dname[32];
 811
 812         PREFIX(i);
 813
 814         /* fill in socket */
 815         if (!kread(sock, &so, sizeof(struct socket))) {
 816                 dprintf(stderr, "can't read sock at %p\n", (void *)sock);
 817                 goto bad;
 818         }
 819
 820         /* fill in protosw entry */
 821         if (!kread(so.so_proto, &proto, sizeof(struct protosw))) {
 822                 dprintf(stderr, "can't read protosw at %p",
 823                     (void *)so.so_proto);
 824                 goto bad;
 825         }
 826
 827         /* fill in domain */
 828         if (!kread(proto.pr_domain, &dom, sizeof(struct domain))) {
 829                 dprintf(stderr, "can't read domain at %p\n",
 830                     (const void *)proto.pr_domain);
 831                 goto bad;
 832         }
 833
 834         if ((len = kvm_read(kd, (u_long)dom.dom_name, dname,
 835             sizeof(dname) - 1)) < 0) {
 836                 dprintf(stderr, "can't read domain name at %p\n",
 837                     (void *)dom.dom_name);
 838                 dname[0] = '\0';
 839         }
 840         else
 841                 dname[len] = '\0';
 842
 843         if ((u_short)so.so_type > STYPEMAX)
 844                 printf("* %s ?%d", dname, so.so_type);
 845         else
 846                 printf("* %s %s", dname, stypename[so.so_type]);
 847
 848         /*
 849          * protocol specific formatting
 850          *
 851          * Try to find interesting things to print.  For tcp, the interesting
 852          * thing is the address of the tcpcb, for udp and others, just the
 853          * inpcb (socket pcb).  For unix domain, its the address of the socket
 854          * pcb and the address of the connected pcb (if connected).  Otherwise
 855          * just print the protocol number and address of the socket itself.
 856          * The idea is not to duplicate netstat, but to make available enough
 857          * information for further analysis.
 858          */
 859         switch(dom.dom_family) {
 860         case AF_INET:
 861         case AF_INET6:
 862                 getinetproto(proto.pr_protocol);
 863                 if (proto.pr_protocol == IPPROTO_TCP ) {
 864                         if (so.so_pcb) {
 865                                 if (kvm_read(kd, (u_long)so.so_pcb,
 866                                     (char *)&inpcb, sizeof(struct inpcb))
 867                                     != sizeof(struct inpcb)) {
 868                                         dprintf(stderr,
 869                                             "can't read inpcb at %p\n",
 870                                             (void *)so.so_pcb);
 871                                         goto bad;
 872                                 }
 873                                 printf(" %lx", (u_long)inpcb.inp_ppcb);
 874                         }
 875                 }
 876                 else if (so.so_pcb)
 877                         printf(" %lx", (u_long)so.so_pcb);
 878                 break;
 879         case AF_UNIX:
 880                 /* print address of pcb and connected pcb */
 881                 if (so.so_pcb) {
 882                         printf(" %lx", (u_long)so.so_pcb);
 883                         if (kvm_read(kd, (u_long)so.so_pcb, (char *)&unpcb,
 884                             sizeof(struct unpcb)) != sizeof(struct unpcb)){
 885                                 dprintf(stderr, "can't read unpcb at %p\n",
 886                                     (void *)so.so_pcb);
 887                                 goto bad;
 888                         }
 889                         if (unpcb.unp_conn) {
 890                                 char shoconn[4], *cp;
 891
 892                                 cp = shoconn;
 893                                 if (!(so.so_state & SS_CANTRCVMORE))
 894                                         *cp++ = '<';
 895                                 *cp++ = '-';
 896                                 if (!(so.so_state & SS_CANTSENDMORE))
 897                                         *cp++ = '>';
 898                                 *cp = '\0';
 899                                 printf(" %s %lx", shoconn,
 900                                     (u_long)unpcb.unp_conn);
 901                         }
 902                 }
 903                 break;
 904         default:
 905                 /* print protocol number and socket address */
 906                 printf(" %d %lx", proto.pr_protocol, (u_long)sock);
 907         }
 908         printf("\n");
 909         return;
 910 bad:
 911         printf("* error\n");
 912 }
 913
 914
 915 /*
 916  * Read the cdev structure in the kernel (as pointed to by a dev_t)
 917  * in order to work out the associated udev_t
 918  */
 919 udev_t
 920 dev2udev(void *dev)
 921 {
 922         struct cdev si;
 923
 924         if (kread(dev, &si, sizeof si)) {
 925                 if ((si.si_umajor & 0xffffff00) ||
 926                     (si.si_uminor & 0x0000ff00)) {
 927                         return NOUDEV;
 928                 }
 929                 return((si.si_umajor << 8) | si.si_uminor);
 930         } else {
 931                 dprintf(stderr, "can't convert dev_t %p to a udev_t\n", dev);
 932                 return NOUDEV;
 933         }
 934 }
 935
 936 udev_t
 937 makeudev(int x, int y)
 938 {
 939         if ((x & 0xffffff00) || (y & 0x0000ff00))
 940                 return NOUDEV;
 941         return ((x << 8) | y);
 942 }
 943
 944 /*
 945  * getinetproto --
 946  *      print name of protocol number
 947  */
 948 static void
 949 getinetproto(int number)
 950 {
 951         static int isopen;
 952         struct protoent *pe;
 953
 954         if (!isopen)
 955                 setprotoent(++isopen);
 956         if ((pe = getprotobynumber(number)) != NULL)
 957                 printf(" %s", pe->p_name);
 958         else
 959                 printf(" %d", number);
 960 }
 961
 962 static int
 963 getfname(const char *filename)
 964 {
 965         struct stat statbuf;
 966         DEVS *cur;
 967
 968         if (stat(filename, &statbuf)) {
 969                 warn("%s", filename);
 970                 return(0);
 971         }
 972         if ((cur = malloc(sizeof(DEVS))) == NULL)
 973                 err(1, NULL);
 974         cur->next = devs;
 975         devs = cur;
 976
 977         cur->ino = statbuf.st_ino;
 978         cur->fsid = statbuf.st_dev;
 979         cur->name = filename;
 980         return(1);
 981 }
 982
 983 static void
 984 usage(void)
 985 {
 986         (void)fprintf(stderr,
 987  "usage: fstat [-fmnv] [-p pid] [-u user] [-N system] [-M core] [file ...]\n");
 988         exit(1);
 989 }
 990
 991 static
 992 void
 993 make_printable(char *buf, int len)
 994 {
 995     while (len > 0) {
 996         if (!isprint(*buf))
 997                 *buf = '?';
 998         ++buf;
 999         --len;
1000     }
1001 }
1002
1003 ssize_t
1004 kread(const void *kaddr, void *uaddr, size_t nbytes)
1005 {
1006     if (nbytes > 0x10000000)
1007         return(0);
1008
1009     if (kvm_read(kd, (u_long)kaddr, (char *)uaddr, nbytes) == (ssize_t)nbytes)
1010         return(1);
1011     else
1012         return(0);
1013 }
1014