utils/mountd/rmtab.c

   1 /*
   2  * utils/mountd/rmtab.c
   3  *
   4  * Manage the rmtab file for mountd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include "config.h"
  10
  11 #include <sys/stat.h>
  12 #include <netinet/in.h>
  13 #include <arpa/inet.h>
  14 #include <netdb.h>
  15 #include "xmalloc.h"
  16 #include "misc.h"
  17 #include "exportfs.h"
  18 #include "xio.h"
  19 #include "mountd.h"
  20
  21 void
  22 mountlist_add(nfs_export *exp, const char *path)
  23 {
  24         struct rmtabent xe;
  25         struct rmtabent *rep;
  26         int             lockid;
  27         long            pos;
  28
  29         if ((lockid = xflock(_PATH_RMTAB, "a")) < 0)
  30                 return;
  31         setrmtabent("r+");
  32         while ((rep = getrmtabent(1, &pos)) != NULL) {
  33                 if (strcmp (rep->r_client,
  34                             exp->m_client->m_hostname) == 0
  35                     && strcmp(rep->r_path, path) == 0) {
  36                         rep->r_count++;
  37                         putrmtabent(rep, &pos);
  38                         endrmtabent();
  39                         xfunlock(lockid);
  40                         return;
  41                 }
  42         }
  43         endrmtabent();
  44         strncpy(xe.r_client, exp->m_client->m_hostname,
  45                 sizeof (xe.r_client) - 1);
  46         xe.r_client [sizeof (xe.r_client) - 1] = '\0';
  47         strncpy(xe.r_path, path, sizeof (xe.r_path) - 1);
  48         xe.r_path [sizeof (xe.r_path) - 1] = '\0';
  49         xe.r_count = 1;
  50         if (setrmtabent("a")) {
  51                 putrmtabent(&xe, NULL);
  52                 endrmtabent();
  53         }
  54         xfunlock(lockid);
  55 }
  56
  57 void
  58 mountlist_del(nfs_export *exp, const char *path)
  59 {
  60         struct rmtabent *rep;
  61         FILE            *fp;
  62         char            *hname = exp->m_client->m_hostname;
  63         int             lockid;
  64         int             match;
  65
  66         if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
  67                 return;
  68         if (!setrmtabent("r")) {
  69                 xfunlock(lockid);
  70                 return;
  71         }
  72         if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  73                 endrmtabent();
  74                 xfunlock(lockid);
  75                 return;
  76         }
  77         while ((rep = getrmtabent(1, NULL)) != NULL) {
  78                 match = !strcmp (rep->r_client, hname)
  79                         && !strcmp(rep->r_path, path);
  80                 if (match)
  81                         rep->r_count--;
  82                 if (!match || rep->r_count)
  83                         fputrmtabent(fp, rep, NULL);
  84         }
  85         if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  86                 xlog(L_ERROR, "couldn't rename %s to %s",
  87                                 _PATH_RMTABTMP, _PATH_RMTAB);
  88         }
  89         endrmtabent();  /* close & unlink */
  90         fendrmtabent(fp);
  91         xfunlock(lockid);
  92 }
  93
  94 void
  95 mountlist_del_all(struct sockaddr_in *sin)
  96 {
  97         struct in_addr  addr = sin->sin_addr;
  98         struct hostent  *hp;
  99         struct rmtabent *rep;
 100         nfs_export      *exp;
 101         FILE            *fp;
 102         int             lockid;
 103
 104         if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
 105                 return;
 106         if (!(hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
 107                 xlog(L_ERROR, "can't get hostname of %s", inet_ntoa(addr));
 108                 xfunlock(lockid);
 109                 return;
 110         }
 111         else
 112                 hp = hostent_dup (hp);
 113
 114         if (!setrmtabent("r")) {
 115                 xfunlock(lockid);
 116                 free (hp);
 117                 return;
 118         }
 119         if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
 120                 endrmtabent();
 121                 xfunlock(lockid);
 122                 free (hp);
 123                 return;
 124         }
 125         while ((rep = getrmtabent(1, NULL)) != NULL) {
 126                 if (strcmp(rep->r_client, hp->h_name) == 0 &&
 127                     (exp = auth_authenticate("umountall", sin, rep->r_path))) {
 128                         export_reset(exp);
 129                         continue;
 130                 }
 131                 fputrmtabent(fp, rep, NULL);
 132         }
 133         if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
 134                 xlog(L_ERROR, "couldn't rename %s to %s",
 135                                 _PATH_RMTABTMP, _PATH_RMTAB);
 136         }
 137         endrmtabent();  /* close & unlink */
 138         fendrmtabent(fp);
 139         xfunlock(lockid);
 140         free (hp);
 141 }
 142
 143 mountlist
 144 mountlist_list(void)
 145 {
 146         static mountlist        mlist = NULL;
 147         static time_t           last_mtime = 0;
 148         mountlist               m;
 149         struct rmtabent         *rep;
 150         struct stat             stb;
 151         int                     lockid;
 152
 153         if ((lockid = xflock(_PATH_RMTAB, "r")) < 0)
 154                 return NULL;
 155         if (stat(_PATH_RMTAB, &stb) < 0) {
 156                 xlog(L_ERROR, "can't stat %s", _PATH_RMTAB);
 157                 return NULL;
 158         }
 159         if (stb.st_mtime != last_mtime) {
 160                 while (mlist) {
 161                         mlist = (m = mlist)->ml_next;
 162                         xfree(m->ml_hostname);
 163                         xfree(m->ml_directory);
 164                         xfree(m);
 165                 }
 166                 last_mtime = stb.st_mtime;
 167
 168                 setrmtabent("r");
 169                 while ((rep = getrmtabent(1, NULL)) != NULL) {
 170                         m = (mountlist) xmalloc(sizeof(*m));
 171                         m->ml_hostname = xstrdup(rep->r_client);
 172                         m->ml_directory = xstrdup(rep->r_path);
 173                         m->ml_next = mlist;
 174                         mlist = m;
 175                 }
 176                 endrmtabent();
 177         }
 178         xfunlock(lockid);
 179
 180         return mlist;
 181 }