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
  28         if ((lockid = xflock(_PATH_RMTAB, "a")) < 0)
  29                 return;
  30         setrmtabent("r");
  31         while ((rep = getrmtabent(1)) != NULL) {
  32                 if (strcmp (rep->r_client,
  33                             exp->m_client->m_hostname) == 0
  34                     && strcmp(rep->r_path, path) == 0) {
  35                         endrmtabent();
  36                         xfunlock(lockid);
  37                         return;
  38                 }
  39         }
  40         endrmtabent();
  41         strncpy(xe.r_client, exp->m_client->m_hostname,
  42                 sizeof (xe.r_client) - 1);
  43         xe.r_client [sizeof (xe.r_client) - 1] = '\0';
  44         strncpy(xe.r_path, path, sizeof (xe.r_path) - 1);
  45         xe.r_path [sizeof (xe.r_path) - 1] = '\0';
  46         if (setrmtabent("a")) {
  47                 putrmtabent(&xe);
  48                 endrmtabent();
  49         }
  50         xfunlock(lockid);
  51 }
  52
  53 void
  54 mountlist_del(nfs_export *exp, const char *path)
  55 {
  56         struct rmtabent *rep;
  57         FILE            *fp;
  58         char            *hname = exp->m_client->m_hostname;
  59         int             lockid;
  60
  61         if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
  62                 return;
  63         if (!setrmtabent("r")) {
  64                 xfunlock(lockid);
  65                 return;
  66         }
  67         if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  68                 endrmtabent();
  69                 xfunlock(lockid);
  70                 return;
  71         }
  72         while ((rep = getrmtabent(1)) != NULL) {
  73                 if (strcmp (rep->r_client, hname)
  74                     || strcmp(rep->r_path, path))
  75                         fputrmtabent(fp, rep);
  76         }
  77         if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  78                 xlog(L_ERROR, "couldn't rename %s to %s",
  79                                 _PATH_RMTABTMP, _PATH_RMTAB);
  80         }
  81         endrmtabent();  /* close & unlink */
  82         fendrmtabent(fp);
  83         xfunlock(lockid);
  84 }
  85
  86 void
  87 mountlist_del_all(struct sockaddr_in *sin)
  88 {
  89         struct in_addr  addr = sin->sin_addr;
  90         struct hostent  *hp;
  91         struct rmtabent *rep;
  92         nfs_export      *exp;
  93         FILE            *fp;
  94         int             lockid;
  95
  96         if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
  97                 return;
  98         if (!(hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
  99                 xlog(L_ERROR, "can't get hostname of %s", inet_ntoa(addr));
 100                 xfunlock(lockid);
 101                 return;
 102         }
 103         else
 104                 hp = hostent_dup (hp);
 105
 106         if (!setrmtabent("r")) {
 107                 xfunlock(lockid);
 108                 free (hp);
 109                 return;
 110         }
 111         if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
 112                 endrmtabent();
 113                 xfunlock(lockid);
 114                 free (hp);
 115                 return;
 116         }
 117         while ((rep = getrmtabent(1)) != NULL) {
 118                 if (strcmp(rep->r_client, hp->h_name) == 0 &&
 119                     (exp = auth_authenticate("umountall", sin, rep->r_path))) {
 120                         export_reset(exp);
 121                         continue;
 122                 }
 123                 fputrmtabent(fp, rep);
 124         }
 125         if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
 126                 xlog(L_ERROR, "couldn't rename %s to %s",
 127                                 _PATH_RMTABTMP, _PATH_RMTAB);
 128         }
 129         endrmtabent();  /* close & unlink */
 130         fendrmtabent(fp);
 131         xfunlock(lockid);
 132         free (hp);
 133 }
 134
 135 mountlist
 136 mountlist_list(void)
 137 {
 138         static mountlist        mlist = NULL;
 139         static time_t           last_mtime = 0;
 140         mountlist               m;
 141         struct rmtabent         *rep;
 142         struct stat             stb;
 143         int                     lockid;
 144
 145         if ((lockid = xflock(_PATH_RMTAB, "r")) < 0)
 146                 return NULL;
 147         if (stat(_PATH_RMTAB, &stb) < 0) {
 148                 xlog(L_ERROR, "can't stat %s", _PATH_RMTAB);
 149                 return NULL;
 150         }
 151         if (stb.st_mtime != last_mtime) {
 152                 while (mlist) {
 153                         mlist = (m = mlist)->ml_next;
 154                         xfree(m->ml_hostname);
 155                         xfree(m->ml_directory);
 156                         xfree(m);
 157                 }
 158                 last_mtime = stb.st_mtime;
 159
 160                 setrmtabent("r");
 161                 while ((rep = getrmtabent(1)) != NULL) {
 162                         m = (mountlist) xmalloc(sizeof(*m));
 163                         m->ml_hostname = xstrdup(rep->r_client);
 164                         m->ml_directory = xstrdup(rep->r_path);
 165                         m->ml_next = mlist;
 166                         mlist = m;
 167                 }
 168                 endrmtabent();
 169         }
 170         xfunlock(lockid);
 171
 172         return mlist;
 173 }