support/export/export.c

   1 /*
   2  * support/export/export.c
   3  *
   4  * Maintain list of exported file systems.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <sys/param.h>
  16 #include <netinet/in.h>
  17 #include <stdlib.h>
  18 #include "xmalloc.h"
  19 #include "nfslib.h"
  20 #include "exportfs.h"
  21
  22 nfs_export      *exportlist[MCL_MAXTYPES] = { NULL, };
  23
  24 static void     export_init(nfs_export *exp, nfs_client *clp,
  25                                         struct exportent *nep);
  26 static int      export_check(nfs_export *, struct hostent *, char *);
  27 static nfs_export *
  28                 export_allowed_internal(struct hostent *hp, char *path);
  29
  30 int
  31 export_read(char *fname)
  32 {
  33         struct exportent        *eep;
  34         nfs_export              *exp;
  35
  36         setexportent(fname, "r");
  37         while ((eep = getexportent(0,1)) != NULL) {
  38           exp = export_lookup(eep->e_hostname, eep->e_path, 0);
  39           if (!exp)
  40             export_create(eep,0);
  41           else {
  42             if (exp->m_export.e_flags != eep->e_flags) {
  43               xlog(L_ERROR, "incompatible duplicated export entries:");
  44               xlog(L_ERROR, "\t%s:%s (0x%x) [IGNORED]", eep->e_hostname,
  45                    eep->e_path, eep->e_flags);
  46               xlog(L_ERROR, "\t%s:%s (0x%x)", exp->m_export.e_hostname,
  47                    exp->m_export.e_path, exp->m_export.e_flags);
  48             }
  49             else {
  50               xlog(L_ERROR, "duplicated export entries:");
  51               xlog(L_ERROR, "\t%s:%s", eep->e_hostname, eep->e_path);
  52               xlog(L_ERROR, "\t%s:%s", exp->m_export.e_hostname,
  53                    exp->m_export.e_path);
  54             }
  55           }
  56         }
  57         endexportent();
  58
  59         return 0;
  60 }
  61
  62 /*
  63  * Create an in-core export struct from an export entry.
  64  */
  65 nfs_export *
  66 export_create(struct exportent *xep, int canonical)
  67 {
  68         nfs_client      *clp;
  69         nfs_export      *exp;
  70
  71         if (!(clp = client_lookup(xep->e_hostname, canonical))) {
  72                 /* bad export entry; complaint already logged */
  73                 return NULL;
  74         }
  75         exp = (nfs_export *) xmalloc(sizeof(*exp));
  76         export_init(exp, clp, xep);
  77         export_add(exp);
  78
  79         return exp;
  80 }
  81
  82 static void
  83 export_init(nfs_export *exp, nfs_client *clp, struct exportent *nep)
  84 {
  85         struct exportent        *e = &exp->m_export;
  86
  87         dupexportent(e, nep);
  88
  89         exp->m_exported = 0;
  90         exp->m_xtabent = 0;
  91         exp->m_mayexport = 0;
  92         exp->m_changed = 0;
  93         exp->m_client = clp;
  94         clp->m_count++;
  95 }
  96
  97 /*
  98  * Duplicate exports data. The in-core export struct retains the
  99  * original hostname from /etc/exports, while the in-core client struct
 100  * gets the newly found FQDN.
 101  */
 102 nfs_export *
 103 export_dup(nfs_export *exp, struct hostent *hp)
 104 {
 105         nfs_export              *new;
 106         nfs_client              *clp;
 107
 108         new = (nfs_export *) xmalloc(sizeof(*new));
 109         memcpy(new, exp, sizeof(*new));
 110         dupexportent(&new->m_export, &exp->m_export);
 111         clp = client_dup(exp->m_client, hp);
 112         clp->m_count++;
 113         new->m_client = clp;
 114         new->m_mayexport = exp->m_mayexport;
 115         new->m_exported = 0;
 116         new->m_xtabent = 0;
 117         new->m_changed = 0;
 118         export_add(new);
 119
 120         return new;
 121 }
 122
 123 void
 124 export_add(nfs_export *exp)
 125 {
 126         nfs_export      **epp;
 127         int             type = exp->m_client->m_type;
 128         int             slen = strlen(exp->m_export.e_path);
 129
 130         if (type < 0 || type >= MCL_MAXTYPES)
 131                 xlog(L_FATAL, "unknown client type in export_add");
 132
 133         epp = exportlist + type;
 134         while (*epp && slen < strlen((*epp)->m_export.e_path))
 135                 epp = &((*epp)->m_next);
 136         exp->m_next = *epp;
 137         *epp = exp;
 138 }
 139
 140 nfs_export *
 141 export_find(struct hostent *hp, char *path)
 142 {
 143         nfs_export      *exp;
 144         int             i;
 145
 146         for (i = 0; i < MCL_MAXTYPES; i++) {
 147                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 148                         if (!export_check(exp, hp, path))
 149                                 continue;
 150                         if (exp->m_client->m_type == MCL_FQDN)
 151                                 return exp;
 152                         return export_dup(exp, hp);
 153                 }
 154         }
 155
 156         return NULL;
 157 }
 158
 159 static nfs_export *
 160 export_allowed_internal (struct hostent *hp, char *path)
 161 {
 162         nfs_export      *exp;
 163         int             i;
 164
 165         for (i = 0; i < MCL_MAXTYPES; i++) {
 166                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 167                         if (!exp->m_mayexport ||
 168                             !export_check(exp, hp, path))
 169                                 continue;
 170                         return exp;
 171                 }
 172         }
 173
 174         return NULL;
 175 }
 176
 177 nfs_export *
 178 export_allowed(struct hostent *hp, char *path)
 179 {
 180         nfs_export              *exp;
 181         char                    epath[MAXPATHLEN+1];
 182         char                    *p = NULL;
 183
 184         if (path [0] != '/') return NULL;
 185
 186         strncpy(epath, path, sizeof (epath) - 1);
 187         epath[sizeof (epath) - 1] = '\0';
 188
 189         /* Try the longest matching exported pathname. */
 190         while (1) {
 191                 exp = export_allowed_internal (hp, epath);
 192                 if (exp)
 193                         return exp;
 194                 /* We have to treat the root, "/", specially. */
 195                 if (p == &epath[1]) break;
 196                 p = strrchr(epath, '/');
 197                 if (p == epath) p++;
 198                 *p = '\0';
 199         }
 200
 201         return NULL;
 202 }
 203
 204 nfs_export *
 205 export_lookup(char *hname, char *path, int canonical)
 206 {
 207         nfs_client      *clp;
 208         nfs_export      *exp;
 209
 210         if (!(clp = client_lookup(hname, canonical)))
 211                 return NULL;
 212         for (exp = exportlist[clp->m_type]; exp; exp = exp->m_next)
 213                 if (exp->m_client == clp && !strcmp(exp->m_export.e_path, path))
 214                         return exp;
 215         return NULL;
 216 }
 217
 218 static int
 219 export_check(nfs_export *exp, struct hostent *hp, char *path)
 220 {
 221         if (strcmp(path, exp->m_export.e_path))
 222                 return 0;
 223
 224         return client_check(exp->m_client, hp);
 225 }
 226
 227 void
 228 export_freeall(void)
 229 {
 230         nfs_export      *exp, *nxt;
 231         int             i;
 232
 233         for (i = 0; i < MCL_MAXTYPES; i++) {
 234                 for (exp = exportlist[i]; exp; exp = nxt) {
 235                         nxt = exp->m_next;
 236                         client_release(exp->m_client);
 237                         if (exp->m_export.e_squids)
 238                                 xfree(exp->m_export.e_squids);
 239                         if (exp->m_export.e_sqgids)
 240                                 xfree(exp->m_export.e_sqgids);
 241                         if (exp->m_export.e_mountpoint)
 242                                 free(exp->m_export.e_mountpoint);
 243                         xfree(exp);
 244                 }
 245                 exportlist[i] = NULL;
 246         }
 247         client_freeall();
 248 }
 249
 250 void
 251 export_reset(nfs_export *exp)
 252 {
 253         if (!exp)
 254                 return;
 255
 256         /* Restore m_path. */
 257         strncpy(exp->m_export.m_path, exp->m_export.e_path,
 258                 sizeof (exp->m_export.m_path) - 1);
 259         exp->m_export.m_path[sizeof (exp->m_export.m_path) - 1] = '\0';
 260 }