fixmount.c revision 174313 
1/*
2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgment:
21 *      This product includes software developed by the University of
22 *      California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *
40 * File: am-utils/fixmount/fixmount.c
41 *
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48
49#define CREATE_TIMEOUT	2	/* seconds */
50#define CALL_TIMEOUT	5	/* seconds */
51
52/* Constant defs */
53#define	ALL		1
54#define	DIRS		2
55
56#define	DODUMP		0x1
57#define	DOEXPORTS	0x2
58#define	DOREMOVE	0x4
59#define	DOVERIFY	0x8
60#define	DOREMALL	0x10
61
62extern int fixmount_check_mount(char *host, struct in_addr hostaddr, char *path);
63
64static char dir_path[NFS_MAXPATHLEN];
65static char localhost[] = "localhost";
66static char thishost[MAXHOSTNAMELEN + 1] = "";
67static exports mntexports;
68static int quiet = 0;
69static int type = 0;
70static jmp_buf before_rpc;
71static mountlist mntdump;
72static struct in_addr thisaddr;
73static CLIENT *clnt_create_timeout(char *, struct timeval *);
74
75RETSIGTYPE create_timeout(int);
76int is_same_host(char *, char *, struct in_addr);
77int main(int, char *[]);
78int remove_all(CLIENT *, char *);
79int remove_mount(CLIENT *, char *, mountlist, int);
80void fix_rmtab(CLIENT *, char *, mountlist, int, int);
81void print_dump(mountlist);
82void usage(void);
83
84
85void
86usage(void)
87{
88  fprintf(stderr, "usage: fixmount [-adervAqf] [-h hostname] host ...\n");
89  exit(1);
90}
91
92
93/*
94 * Check hostname against other name and its IP address
95 */
96int
97is_same_host(char *name1, char *name2, struct in_addr addr2)
98{
99  if (strcasecmp(name1, name2) == 0) {
100    return 1;
101  } else if (addr2.s_addr == INADDR_NONE) {
102    return 0;
103  } else {
104    static char lasthost[MAXHOSTNAMELEN] = "";
105    static struct in_addr addr1;
106    struct hostent *he;
107
108    /*
109     * To save nameserver lookups, and because this function
110     * is typically called repeatedly on the same names,
111     * cache the last lookup result and reuse it if possible.
112     */
113    if (strcasecmp(name1, lasthost) == 0) {
114      return (addr1.s_addr == addr2.s_addr);
115    } else if (!(he = gethostbyname(name1))) {
116      return 0;
117    } else {
118      xstrlcpy(lasthost, name1, MAXHOSTNAMELEN);
119      memcpy(&addr1, he->h_addr, sizeof(addr1));
120      return (addr1.s_addr == addr2.s_addr);
121    }
122  }
123}
124
125
126/*
127 * Print the binary tree in inorder so that output is sorted.
128 */
129void
130print_dump(mountlist mp)
131{
132  if (mp == NULL)
133    return;
134  if (is_same_host(mp->ml_hostname, thishost, thisaddr)) {
135    switch (type) {
136    case ALL:
137      printf("%s:%s\n", mp->ml_hostname, mp->ml_directory);
138      break;
139    case DIRS:
140      printf("%s\n", mp->ml_directory);
141      break;
142    default:
143      printf("%s\n", mp->ml_hostname);
144      break;
145    };
146  }
147  if (mp->ml_next)
148    print_dump(mp->ml_next);
149}
150
151
152/*
153 * remove entry from remote rmtab
154 */
155int
156remove_mount(CLIENT *client, char *host, mountlist ml, int fixit)
157{
158  enum clnt_stat estat;
159  struct timeval tv;
160  char *pathp = dir_path;
161
162  xstrlcpy(dir_path, ml->ml_directory, sizeof(dir_path));
163
164  if (!fixit) {
165    printf("%s: bogus mount %s:%s\n", host, ml->ml_hostname, ml->ml_directory);
166    fflush(stdout);
167  } else {
168    printf("%s: removing %s:%s\n", host, ml->ml_hostname, ml->ml_directory);
169    fflush(stdout);
170
171    tv.tv_sec = CALL_TIMEOUT;
172    tv.tv_usec = 0;
173
174    if ((estat = clnt_call(client,
175			   MOUNTPROC_UMNT,
176			   (XDRPROC_T_TYPE) xdr_dirpath,
177			   (char *) &pathp,
178			   (XDRPROC_T_TYPE) xdr_void,
179			   (char *) 0,
180			   tv)) != RPC_SUCCESS) {
181      fprintf(stderr, "%s:%s MOUNTPROC_UMNT: ",
182	      host, ml->ml_directory);
183      clnt_perrno(estat);
184      fflush(stderr);
185      return -1;
186    }
187  }
188  return 0;
189}
190
191
192/*
193 * fix mount list on remote host
194 */
195void
196fix_rmtab(CLIENT *client, char *host, mountlist mp, int fixit, int force)
197{
198  mountlist p;
199  struct hostent *he;
200  struct in_addr hostaddr;
201
202  /*
203   * Obtain remote address for comparisons
204   */
205  if ((he = gethostbyname(host))) {
206    memcpy(&hostaddr, he->h_addr, sizeof(hostaddr));
207  } else {
208    hostaddr.s_addr = INADDR_NONE;
209  }
210
211  for (p = mp; p; p = p->ml_next) {
212    if (is_same_host(p->ml_hostname, thishost, thisaddr)) {
213      if (force || !fixmount_check_mount(host, hostaddr, p->ml_directory))
214	remove_mount(client, host, p, fixit);
215    }
216  }
217}
218
219
220/*
221 * remove all entries from remote rmtab
222 */
223int
224remove_all(CLIENT *client, char *host)
225{
226  enum clnt_stat estat;
227  struct timeval tv;
228
229  printf("%s: removing ALL\n", host);
230  fflush(stdout);
231
232  tv.tv_sec = CALL_TIMEOUT;
233  tv.tv_usec = 0;
234
235  if ((estat = clnt_call(client,
236			 MOUNTPROC_UMNTALL,
237			 (XDRPROC_T_TYPE) xdr_void,
238			 (char *) 0,
239			 (XDRPROC_T_TYPE) xdr_void,
240			 (char *) 0,
241			 tv)) != RPC_SUCCESS) {
242    /*
243     * RPC_SYSTEMERROR is returned even if all went well
244     */
245    if (estat != RPC_SYSTEMERROR) {
246      fprintf(stderr, "%s MOUNTPROC_UMNTALL: ", host);
247      clnt_perrno(estat);
248      fflush(stderr);
249      return -1;
250    }
251  }
252
253  return 0;
254}
255
256
257/*
258 * This command queries the NFS mount daemon for it's mount list and/or
259 * it's exports list and prints them out.
260 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
261 * for detailed information on the protocol.
262 */
263int
264main(int argc, char *argv[])
265{
266  AUTH *auth;
267  CLIENT *client;
268  char *host;
269  enum clnt_stat estat;
270  exports exp;
271  extern char *optarg;
272  extern int optind;
273  groups grp;
274  int ch;
275  int force = 0;
276  int morethanone;
277  register int rpcs = 0;
278  struct timeval tv;
279
280  while ((ch = getopt(argc, argv, "adervAqfh:")) != -1)
281    switch ((char) ch) {
282
283    case 'a':
284      if (type == 0) {
285	type = ALL;
286	rpcs |= DODUMP;
287      } else
288	usage();
289      break;
290
291    case 'd':
292      if (type == 0) {
293	type = DIRS;
294	rpcs |= DODUMP;
295      } else
296	usage();
297      break;
298
299    case 'e':
300      rpcs |= DOEXPORTS;
301      break;
302
303    case 'r':
304      rpcs |= DOREMOVE;
305      break;
306
307    case 'A':
308      rpcs |= DOREMALL;
309      break;
310
311    case 'v':
312      rpcs |= DOVERIFY;
313      break;
314
315    case 'q':
316      quiet = 1;
317      break;
318
319    case 'f':
320      force = 1;
321      break;
322
323    case 'h':
324      xstrlcpy(thishost, optarg, sizeof(thishost));
325      break;
326
327    case '?':
328    default:
329      usage();
330    }
331
332  if (optind == argc)
333    usage();
334
335  if (rpcs == 0)
336    rpcs = DODUMP;
337
338  if (!*thishost) {
339    struct hostent *he;
340
341    if (gethostname(thishost, sizeof(thishost)) < 0) {
342      perror("gethostname");
343      exit(1);
344    }
345    thishost[sizeof(thishost) - 1] = '\0';
346
347    /*
348     * We need the hostname as it appears to the other side's
349     * mountd, so get our own hostname by reverse address
350     * resolution.
351     */
352    if (!(he = gethostbyname(thishost))) {
353      fprintf(stderr, "gethostbyname failed on %s\n",
354	      thishost);
355      exit(1);
356    }
357    memcpy(&thisaddr, he->h_addr, sizeof(thisaddr));
358    if (!(he = gethostbyaddr((char *) &thisaddr, sizeof(thisaddr),
359			     he->h_addrtype))) {
360      fprintf(stderr, "gethostbyaddr failed on %s\n",
361	      inet_ntoa(thisaddr));
362      exit(1);
363    }
364    xstrlcpy(thishost, he->h_name, sizeof(thishost));
365  } else {
366    thisaddr.s_addr = INADDR_NONE;
367  }
368
369  if (!(auth = authunix_create_default())) {
370    fprintf(stderr, "couldn't create authentication handle\n");
371    exit(1);
372  }
373  morethanone = (optind + 1 < argc);
374
375  for (; optind < argc; optind++) {
376
377    host = argv[optind];
378    tv.tv_sec = CREATE_TIMEOUT;
379    tv.tv_usec = 0;
380
381    if (!(client = clnt_create_timeout(host, &tv)))
382        continue;
383
384    client->cl_auth = auth;
385    tv.tv_sec = CALL_TIMEOUT;
386    tv.tv_usec = 0;
387
388    if (rpcs & (DODUMP | DOREMOVE | DOVERIFY))
389      if ((estat = clnt_call(client,
390			     MOUNTPROC_DUMP,
391			     (XDRPROC_T_TYPE) xdr_void,
392			     (char *) 0,
393			     (XDRPROC_T_TYPE) xdr_mountlist,
394			     (char *) &mntdump,
395			     tv)) != RPC_SUCCESS) {
396	fprintf(stderr, "%s: MOUNTPROC_DUMP: ", host);
397	clnt_perrno(estat);
398	fflush(stderr);
399	mntdump = NULL;
400	goto next;
401      }
402    if (rpcs & DOEXPORTS)
403      if ((estat = clnt_call(client,
404			     MOUNTPROC_EXPORT,
405			     (XDRPROC_T_TYPE) xdr_void,
406			     (char *) 0,
407			     (XDRPROC_T_TYPE) xdr_exports,
408			     (char *) &mntexports,
409			     tv)) != RPC_SUCCESS) {
410	fprintf(stderr, "%s: MOUNTPROC_EXPORT: ", host);
411	clnt_perrno(estat);
412	fflush(stderr);
413	mntexports = NULL;
414	goto next;
415      }
416
417    /* Now just print out the results */
418    if ((rpcs & (DODUMP | DOEXPORTS)) &&
419	morethanone) {
420      printf(">>> %s <<<\n", host);
421      fflush(stdout);
422    }
423
424    if (rpcs & DODUMP) {
425      print_dump(mntdump);
426    }
427
428    if (rpcs & DOEXPORTS) {
429      exp = mntexports;
430      while (exp) {
431	printf("%-35s", exp->ex_dir);
432	grp = exp->ex_groups;
433	if (grp == NULL) {
434	  printf("Everyone\n");
435	} else {
436	  while (grp) {
437	    printf("%s ", grp->gr_name);
438	    grp = grp->gr_next;
439	  }
440	  printf("\n");
441	}
442	exp = exp->ex_next;
443      }
444    }
445
446    if (rpcs & DOVERIFY)
447      fix_rmtab(client, host, mntdump, 0, force);
448
449    if (rpcs & DOREMOVE)
450      fix_rmtab(client, host, mntdump, 1, force);
451
452    if (rpcs & DOREMALL)
453      remove_all(client, host);
454
455  next:
456    if (mntdump)
457      (void) clnt_freeres(client,
458			  (XDRPROC_T_TYPE) xdr_mountlist,
459			  (char *) &mntdump);
460    if (mntexports)
461      (void) clnt_freeres(client,
462			  (XDRPROC_T_TYPE) xdr_exports,
463			  (char *) &mntexports);
464
465    clnt_destroy(client);
466  }
467  exit(0);
468  return 0; /* should never reach here */
469}
470
471
472RETSIGTYPE
473create_timeout(int sig)
474{
475  signal(SIGALRM, SIG_DFL);
476  longjmp(before_rpc, 1);
477}
478
479
480#ifndef HAVE_TRANSPORT_TYPE_TLI
481/*
482 * inetresport creates a datagram socket and attempts to bind it to a
483 * secure port.
484 * returns: The bound socket, or -1 to indicate an error.
485 */
486static int
487inetresport(int ty)
488{
489  int alport;
490  struct sockaddr_in addr;
491  int fd;
492
493  memset(&addr, 0, sizeof(addr));
494  /* as per POSIX, sin_len need not be set (used internally by kernel) */
495
496  addr.sin_family = AF_INET;	/* use internet address family */
497  addr.sin_addr.s_addr = INADDR_ANY;
498  if ((fd = socket(AF_INET, ty, 0)) < 0)
499    return -1;
500
501  for (alport = IPPORT_RESERVED - 1; alport > IPPORT_RESERVED / 2 + 1; alport--) {
502    addr.sin_port = htons((u_short) alport);
503    if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) >= 0)
504      return fd;
505    if (errno != EADDRINUSE) {
506      close(fd);
507      return -1;
508    }
509  }
510  close(fd);
511  errno = EAGAIN;
512  return -1;
513}
514
515
516/*
517 * Privsock() calls inetresport() to attempt to bind a socket to a secure
518 * port.  If inetresport() fails, privsock returns a magic socket number which
519 * indicates to RPC that it should make its own socket.
520 * returns: A privileged socket # or RPC_ANYSOCK.
521 */
522static int
523privsock(int ty)
524{
525  int sock = inetresport(ty);
526
527  if (sock < 0) {
528    errno = 0;
529    /* Couldn't get a secure port, let RPC make an insecure one */
530    sock = RPC_ANYSOCK;
531  }
532  return sock;
533}
534#endif /* not HAVE_TRANSPORT_TYPE_TLI */
535
536
537static CLIENT *
538clnt_create_timeout(char *host, struct timeval *tvp)
539{
540  CLIENT *clnt;
541  struct sockaddr_in host_addr;
542  struct hostent *hp;
543#ifndef HAVE_TRANSPORT_TYPE_TLI
544  int s;
545#endif /* not HAVE_TRANSPORT_TYPE_TLI */
546
547  if (setjmp(before_rpc)) {
548    if (!quiet) {
549      fprintf(stderr, "%s: ", host);
550      clnt_perrno(RPC_TIMEDOUT);
551      fprintf(stderr, "\n");
552      fflush(stderr);
553    }
554    return NULL;
555  }
556  signal(SIGALRM, create_timeout);
557  ualarm(tvp->tv_sec * 1000000 + tvp->tv_usec, 0);
558
559  /*
560   * Get address of host
561   */
562  if ((hp = gethostbyname(host)) == 0 && !STREQ(host, localhost)) {
563    fprintf(stderr, "can't get address of %s\n", host);
564    return NULL;
565  }
566  memset(&host_addr, 0, sizeof(host_addr));
567  /* as per POSIX, sin_len need not be set (used internally by kernel) */
568  host_addr.sin_family = AF_INET;
569  if (hp) {
570    memmove((voidp) &host_addr.sin_addr, (voidp) hp->h_addr,
571	    sizeof(host_addr.sin_addr));
572  } else {
573    /* fake "localhost" */
574    host_addr.sin_addr.s_addr = htonl(0x7f000001);
575  }
576
577#ifdef HAVE_TRANSPORT_TYPE_TLI
578  /* try TCP first (in case return data is large), then UDP */
579  clnt = clnt_create(host, MOUNTPROG, MOUNTVERS, "tcp");
580  if (!clnt)
581    clnt = clnt_create(host, MOUNTPROG, MOUNTVERS, "udp");
582#else /* not HAVE_TRANSPORT_TYPE_TLI */
583  s = RPC_ANYSOCK;
584  clnt = clnttcp_create(&host_addr, MOUNTPROG, MOUNTVERS, &s, 0, 0);
585  if (!clnt) {
586    /* XXX: do we need to close(s) ? */
587    s = privsock(SOCK_DGRAM);
588    clnt = clntudp_create(&host_addr, MOUNTPROG, MOUNTVERS, *tvp, &s);
589  }
590#endif /* not HAVE_TRANSPORT_TYPE_TLI */
591
592  if (!clnt) {
593    ualarm(0, 0);
594    if (!quiet) {
595      clnt_pcreateerror(host);
596      fflush(stderr);
597    }
598    return NULL;
599  }
600
601  ualarm(0, 0);
602  return clnt;
603}
604