fixmount.c revision 38495 
1/*
2 * Copyright (c) 1997-1998 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 acknowledgement:
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 *      %W% (Berkeley) %G%
40 *
41 * $Id: fixmount.c,v 5.2.2.2 1992/05/31 16:35:45 jsp Exp $
42 *
43 */
44
45#ifdef HAVE_CONFIG_H
46# include <config.h>
47#endif /* HAVE_CONFIG_H */
48#include <am_defs.h>
49
50#define CREATE_TIMEOUT	2	/* seconds */
51#define CALL_TIMEOUT	5	/* seconds */
52
53#ifndef INADDR_NONE
54# define INADDR_NONE	0xffffffff
55#endif /* not INADDR_NONE */
56
57/* Constant defs */
58#define	ALL		1
59#define	DIRS		2
60
61#define	DODUMP		0x1
62#define	DOEXPORTS	0x2
63#define	DOREMOVE	0x4
64#define	DOVERIFY	0x8
65#define	DOREMALL	0x10
66
67extern int fixmount_check_mount(char *host, struct in_addr hostaddr, char *path);
68
69static char dir_path[NFS_MAXPATHLEN];
70static char localhost[] = "localhost";
71static char thishost[MAXHOSTNAMELEN] = "";
72static exports mntexports;
73static int quiet = 0;
74static int type = 0;
75static jmp_buf before_rpc;
76static mountlist mntdump;
77static struct in_addr thisaddr;
78static CLIENT *clnt_create_timeout(char *, struct timeval *);
79
80RETSIGTYPE create_timeout(int);
81int is_same_host(char *, char *, struct in_addr);
82int main(int, char *[]);
83int remove_all(CLIENT *, char *);
84int remove_mount(CLIENT *, char *, mountlist, int);
85void fix_rmtab(CLIENT *, char *, mountlist, int, int);
86void print_dump(mountlist);
87void usage(void);
88
89/* dummy variables */
90char *progname;
91char hostname[MAXHOSTNAMELEN];
92int orig_umask, foreground, debug_flags;
93pid_t mypid;
94serv_state amd_state;
95
96void
97usage(void)
98{
99  fprintf(stderr, "usage: fixmount [-adervAqf] [-h hostname] host ...\n");
100  exit(1);
101}
102
103
104/*
105 * Check hostname against other name and its IP address
106 */
107int
108is_same_host(char *name1, char *name2, struct in_addr addr2)
109{
110  if (strcasecmp(name1, name2) == 0) {
111    return 1;
112  } else if (addr2.s_addr == INADDR_NONE) {
113    return 0;
114  } else {
115    static char lasthost[MAXHOSTNAMELEN] = "";
116    static struct in_addr addr1;
117    struct hostent *he;
118
119    /*
120     * To save nameserver lookups, and because this function
121     * is typically called repeatedly on the same names,
122     * cache the last lookup result and reuse it if possible.
123     */
124    if (strcasecmp(name1, lasthost) == 0) {
125      return (addr1.s_addr == addr2.s_addr);
126    } else if (!(he = gethostbyname(name1))) {
127      return 0;
128    } else {
129      strncpy(lasthost, name1, sizeof(lasthost) - 1);
130      memcpy(&addr1, he->h_addr, sizeof(addr1));
131      return (addr1.s_addr == addr2.s_addr);
132    }
133  }
134}
135
136
137/*
138 * Print the binary tree in inorder so that output is sorted.
139 */
140void
141print_dump(mountlist mp)
142{
143  if (mp == NULL)
144    return;
145  if (is_same_host(mp->ml_hostname, thishost, thisaddr)) {
146    switch (type) {
147    case ALL:
148      printf("%s:%s\n", mp->ml_hostname, mp->ml_directory);
149      break;
150    case DIRS:
151      printf("%s\n", mp->ml_directory);
152      break;
153    default:
154      printf("%s\n", mp->ml_hostname);
155      break;
156    };
157  }
158  if (mp->ml_next)
159    print_dump(mp->ml_next);
160}
161
162
163/*
164 * remove entry from remote rmtab
165 */
166int
167remove_mount(CLIENT *client, char *host, mountlist ml, int fixit)
168{
169  enum clnt_stat estat;
170  struct timeval tv;
171  char *pathp = dir_path;
172
173  strncpy(dir_path, ml->ml_directory, sizeof(dir_path));
174
175  if (!fixit) {
176    printf("%s: bogus mount %s:%s\n", host, ml->ml_hostname, ml->ml_directory);
177    fflush(stdout);
178  } else {
179    printf("%s: removing %s:%s\n", host, ml->ml_hostname, ml->ml_directory);
180    fflush(stdout);
181
182    tv.tv_sec = CALL_TIMEOUT;
183    tv.tv_usec = 0;
184
185    if ((estat = clnt_call(client,
186			   MOUNTPROC_UMNT,
187			   (XDRPROC_T_TYPE) xdr_dirpath,
188			   (char *) &pathp,
189			   (XDRPROC_T_TYPE) xdr_void,
190			   (char *) 0,
191			   tv)) != RPC_SUCCESS) {
192      fprintf(stderr, "%s:%s MOUNTPROC_UMNT: ",
193	      host, ml->ml_directory);
194      clnt_perrno(estat);
195      fflush(stderr);
196      return -1;
197    }
198  }
199  return 0;
200}
201
202
203/*
204 * fix mount list on remote host
205 */
206void
207fix_rmtab(CLIENT *client, char *host, mountlist mp, int fixit, int force)
208{
209  mountlist p;
210  struct hostent *he;
211  struct in_addr hostaddr;
212
213  /*
214   * Obtain remote address for comparisons
215   */
216  if ((he = gethostbyname(host))) {
217    memcpy(&hostaddr, he->h_addr, sizeof(hostaddr));
218  } else {
219    hostaddr.s_addr = INADDR_NONE;
220  }
221
222  for (p = mp; p; p = p->ml_next) {
223    if (is_same_host(p->ml_hostname, thishost, thisaddr)) {
224      if (force || !fixmount_check_mount(host, hostaddr, p->ml_directory))
225	remove_mount(client, host, p, fixit);
226    }
227  }
228}
229
230
231/*
232 * remove all entries from remote rmtab
233 */
234int
235remove_all(CLIENT *client, char *host)
236{
237  enum clnt_stat estat;
238  struct timeval tv;
239
240  printf("%s: removing ALL\n", host);
241  fflush(stdout);
242
243  tv.tv_sec = CALL_TIMEOUT;
244  tv.tv_usec = 0;
245
246  if ((estat = clnt_call(client,
247			 MOUNTPROC_UMNTALL,
248			 (XDRPROC_T_TYPE) xdr_void,
249			 (char *) 0,
250			 (XDRPROC_T_TYPE) xdr_void,
251			 (char *) 0,
252			 tv)) != RPC_SUCCESS) {
253    /*
254     * RPC_SYSTEMERROR is returned even if all went well
255     */
256    if (estat != RPC_SYSTEMERROR) {
257      fprintf(stderr, "%s MOUNTPROC_UMNTALL: ", host);
258      clnt_perrno(estat);
259      fflush(stderr);
260      return -1;
261    }
262  }
263
264  return 0;
265}
266
267
268/*
269 * This command queries the NFS mount daemon for it's mount list and/or
270 * it's exports list and prints them out.
271 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
272 * for detailed information on the protocol.
273 */
274int
275main(int argc, char *argv[])
276{
277  AUTH *auth;
278  CLIENT *client;
279  char *host;
280  enum clnt_stat estat;
281  exports exp;
282  extern char *optarg;
283  extern int optind;
284  groups grp;
285  int ch;
286  int force = 0;
287  int morethanone;
288  register int rpcs = 0;
289  struct timeval tv;
290
291  while ((ch = getopt(argc, argv, "adervAqfh:")) != EOF)
292    switch ((char) ch) {
293
294    case 'a':
295      if (type == 0) {
296	type = ALL;
297	rpcs |= DODUMP;
298      } else
299	usage();
300      break;
301
302    case 'd':
303      if (type == 0) {
304	type = DIRS;
305	rpcs |= DODUMP;
306      } else
307	usage();
308      break;
309
310    case 'e':
311      rpcs |= DOEXPORTS;
312      break;
313
314    case 'r':
315      rpcs |= DOREMOVE;
316      break;
317
318    case 'A':
319      rpcs |= DOREMALL;
320      break;
321
322    case 'v':
323      rpcs |= DOVERIFY;
324      break;
325
326    case 'q':
327      quiet = 1;
328      break;
329
330    case 'f':
331      force = 1;
332      break;
333
334    case 'h':
335      strncpy(thishost, optarg, sizeof(thishost));
336      thishost[sizeof(thishost) - 1] = '\0';
337      break;
338
339    case '?':
340    default:
341      usage();
342    }
343
344  if (optind == argc)
345    usage();
346
347  if (rpcs == 0)
348    rpcs = DODUMP;
349
350  if (!*thishost) {
351    struct hostent *he;
352
353    if (gethostname(thishost, sizeof(thishost)) < 0) {
354      perror("gethostname");
355      exit(1);
356    }
357
358    /*
359     * We need the hostname as it appears to the other side's
360     * mountd, so get our own hostname by reverse address
361     * resolution.
362     */
363    if (!(he = gethostbyname(thishost))) {
364      fprintf(stderr, "gethostbyname failed on %s\n",
365	      thishost);
366      exit(1);
367    }
368    memcpy(&thisaddr, he->h_addr, sizeof(thisaddr));
369    if (!(he = gethostbyaddr((char *) &thisaddr, sizeof(thisaddr),
370			     he->h_addrtype))) {
371      fprintf(stderr, "gethostbyaddr failed on %s\n",
372	      inet_ntoa(thisaddr));
373      exit(1);
374    }
375    strncpy(thishost, he->h_name, sizeof(thishost));
376    thishost[sizeof(thishost) - 1] = '\0';
377  } else {
378    thisaddr.s_addr = INADDR_NONE;
379  }
380
381  if (!(auth = authunix_create_default())) {
382    fprintf(stderr, "couldn't create authentication handle\n");
383    exit(1);
384  }
385  morethanone = (optind + 1 < argc);
386
387  for (; optind < argc; optind++) {
388
389    host = argv[optind];
390    tv.tv_sec = CREATE_TIMEOUT;
391    tv.tv_usec = 0;
392
393    if (!(client = clnt_create_timeout(host, &tv)))
394        continue;
395
396    client->cl_auth = auth;
397    tv.tv_sec = CALL_TIMEOUT;
398    tv.tv_usec = 0;
399
400    if (rpcs & (DODUMP | DOREMOVE | DOVERIFY))
401      if ((estat = clnt_call(client,
402			     MOUNTPROC_DUMP,
403			     (XDRPROC_T_TYPE) xdr_void,
404			     (char *) 0,
405			     (XDRPROC_T_TYPE) xdr_mountlist,
406			     (char *) &mntdump,
407			     tv)) != RPC_SUCCESS) {
408	fprintf(stderr, "%s: MOUNTPROC_DUMP: ", host);
409	clnt_perrno(estat);
410	fflush(stderr);
411	mntdump = NULL;
412	goto next;
413      }
414    if (rpcs & DOEXPORTS)
415      if ((estat = clnt_call(client,
416			     MOUNTPROC_EXPORT,
417			     (XDRPROC_T_TYPE) xdr_void,
418			     (char *) 0,
419			     (XDRPROC_T_TYPE) xdr_exports,
420			     (char *) &mntexports,
421			     tv)) != RPC_SUCCESS) {
422	fprintf(stderr, "%s: MOUNTPROC_EXPORT: ", host);
423	clnt_perrno(estat);
424	fflush(stderr);
425	mntexports = NULL;
426	goto next;
427      }
428
429    /* Now just print out the results */
430    if ((rpcs & (DODUMP | DOEXPORTS)) &&
431	morethanone) {
432      printf(">>> %s <<<\n", host);
433      fflush(stdout);
434    }
435
436    if (rpcs & DODUMP) {
437      print_dump(mntdump);
438    }
439
440    if (rpcs & DOEXPORTS) {
441      exp = mntexports;
442      while (exp) {
443	printf("%-35s", exp->ex_dir);
444	grp = exp->ex_groups;
445	if (grp == NULL) {
446	  printf("Everyone\n");
447	} else {
448	  while (grp) {
449	    printf("%s ", grp->gr_name);
450	    grp = grp->gr_next;
451	  }
452	  printf("\n");
453	}
454	exp = exp->ex_next;
455      }
456    }
457
458    if (rpcs & DOVERIFY)
459      fix_rmtab(client, host, mntdump, 0, force);
460
461    if (rpcs & DOREMOVE)
462      fix_rmtab(client, host, mntdump, 1, force);
463
464    if (rpcs & DOREMALL)
465      remove_all(client, host);
466
467  next:
468    if (mntdump)
469      (void) clnt_freeres(client,
470			  (XDRPROC_T_TYPE) xdr_mountlist,
471			  (char *) &mntdump);
472    if (mntexports)
473      (void) clnt_freeres(client,
474			  (XDRPROC_T_TYPE) xdr_exports,
475			  (char *) &mntexports);
476
477    clnt_destroy(client);
478  }
479  exit(0);
480  return 0; /* should never reach here */
481}
482
483
484RETSIGTYPE
485create_timeout(int sig)
486{
487  signal(SIGALRM, SIG_DFL);
488  longjmp(before_rpc, 1);
489}
490
491
492#ifndef HAVE_TRANSPORT_TYPE_TLI
493/*
494 * inetresport creates a datagram socket and attempts to bind it to a
495 * secure port.
496 * returns: The bound socket, or -1 to indicate an error.
497 */
498static int
499inetresport(int ty)
500{
501  int alport;
502  struct sockaddr_in addr;
503  int fd;
504
505  /* Use internet address family */
506  addr.sin_family = AF_INET;
507  addr.sin_addr.s_addr = INADDR_ANY;
508  if ((fd = socket(AF_INET, ty, 0)) < 0)
509    return -1;
510
511  for (alport = IPPORT_RESERVED - 1; alport > IPPORT_RESERVED / 2 + 1; alport--) {
512    addr.sin_port = htons((u_short) alport);
513    if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) >= 0)
514      return fd;
515    if (errno != EADDRINUSE) {
516      close(fd);
517      return -1;
518    }
519  }
520  close(fd);
521  errno = EAGAIN;
522  return -1;
523}
524
525
526/*
527 * Privsock() calls inetresport() to attempt to bind a socket to a secure
528 * port.  If inetresport() fails, privsock returns a magic socket number which
529 * indicates to RPC that it should make its own socket.
530 * returns: A privileged socket # or RPC_ANYSOCK.
531 */
532static int
533privsock(int ty)
534{
535  int sock = inetresport(ty);
536
537  if (sock < 0) {
538    errno = 0;
539    /* Couldn't get a secure port, let RPC make an insecure one */
540    sock = RPC_ANYSOCK;
541  }
542  return sock;
543}
544#endif /* not HAVE_TRANSPORT_TYPE_TLI */
545
546
547static CLIENT *
548clnt_create_timeout(char *host, struct timeval *tvp)
549{
550  CLIENT *clnt;
551  struct sockaddr_in host_addr;
552  struct hostent *hp;
553#ifndef HAVE_TRANSPORT_TYPE_TLI
554  int s;
555#endif /* not HAVE_TRANSPORT_TYPE_TLI */
556
557  if (setjmp(before_rpc)) {
558    if (!quiet) {
559      fprintf(stderr, "%s: ", host);
560      clnt_perrno(RPC_TIMEDOUT);
561      fprintf(stderr, "\n");
562      fflush(stderr);
563    }
564    return NULL;
565  }
566  signal(SIGALRM, create_timeout);
567  ualarm(tvp->tv_sec * 1000000 + tvp->tv_usec, 0);
568
569  /*
570   * Get address of host
571   */
572  if ((hp = gethostbyname(host)) == 0 && !STREQ(host, localhost)) {
573    fprintf(stderr, "can't get address of %s\n", host);
574    return NULL;
575  }
576  memset(&host_addr, 0, sizeof host_addr);
577  host_addr.sin_family = AF_INET;
578  if (hp) {
579    memmove((voidp) &host_addr.sin_addr, (voidp) hp->h_addr,
580	    sizeof(host_addr.sin_addr));
581  } else {
582    /* fake "localhost" */
583    host_addr.sin_addr.s_addr = htonl(0x7f000001);
584  }
585
586#ifdef HAVE_TRANSPORT_TYPE_TLI
587  /* try TCP first (in case return data is large), then UDP */
588  clnt = clnt_create(host, MOUNTPROG, MOUNTVERS, "tcp");
589  if (!clnt)
590    clnt = clnt_create(host, MOUNTPROG, MOUNTVERS, "udp");
591#else /* not HAVE_TRANSPORT_TYPE_TLI */
592  s = RPC_ANYSOCK;
593  clnt = clnttcp_create(&host_addr, MOUNTPROG, MOUNTVERS, &s, 0, 0);
594  if (!clnt) {
595    /* XXX: do we need to close(s) ? */
596    s = privsock(SOCK_DGRAM);
597    clnt = clntudp_create(&host_addr, MOUNTPROG, MOUNTVERS, *tvp, &s);
598  }
599#endif /* not HAVE_TRANSPORT_TYPE_TLI */
600
601  if (!clnt) {
602    ualarm(0, 0);
603    if (!quiet) {
604      clnt_pcreateerror(host);
605      fflush(stderr);
606    }
607    return NULL;
608  }
609
610  ualarm(0, 0);
611  return clnt;
612}
613