2 * support/export/client.c
4 * Maintain list of nfsd clients.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
13 #include <sys/types.h>
14 #include <netinet/in.h>
15 #include <arpa/inet.h>
25 /* netgroup stuff never seems to be defined in any header file. Linux is
28 #if !defined(__GLIBC__) || __GLIBC__ < 2
29 extern int innetgr(char *netgr, char *host, char *, char *);
32 static char *add_name(char *old, const char *add);
33 static int client_init(nfs_client *clp, const char *hname,
36 nfs_client *clientlist[MCL_MAXTYPES] = { NULL, };
40 init_addrlist(nfs_client *clp, const struct hostent *hp)
49 for (i = 0; *ap != NULL && i < NFSCLNT_ADDRMAX; i++, ap++)
50 clp->m_addrlist[i] = *(struct in_addr *)*ap;
56 client_free(nfs_client *clp)
58 xfree(clp->m_hostname);
62 /* if canonical is set, then we *know* this is already a canonical name
63 * so hostname lookup is avoided.
64 * This is used when reading /proc/fs/nfs/exports
67 client_lookup(char *hname, int canonical)
69 nfs_client *clp = NULL;
71 struct hostent *hp = NULL;
73 htype = client_gettype(hname);
75 if (htype == MCL_FQDN && !canonical) {
77 hp = gethostbyname(hname);
78 if (hp == NULL || hp->h_addrtype != AF_INET) {
79 xlog(L_ERROR, "%s has non-inet addr", hname);
82 /* make sure we have canonical name */
83 hp2 = hostent_dup(hp);
84 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
88 /* but now we might not have all addresses... */
89 if (hp2->h_addr_list[1]) {
91 gethostbyname(hp->h_name);
94 hp = hostent_dup(hp3);
101 hname = (char *) hp->h_name;
103 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
104 if (client_check(clp, hp))
108 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
109 if (strcasecmp(hname, clp->m_hostname)==0)
115 clp = (nfs_client *) xmalloc(sizeof(*clp));
116 memset(clp, 0, sizeof(*clp));
118 if (!client_init(clp, hname, NULL)) {
126 if (htype == MCL_FQDN && clp->m_naddr == 0)
127 init_addrlist(clp, hp);
137 client_dup(nfs_client *clp, struct hostent *hp)
141 new = (nfs_client *) xmalloc(sizeof(*new));
142 memcpy(new, clp, sizeof(*new));
143 new->m_type = MCL_FQDN;
144 new->m_hostname = NULL;
146 if (!client_init(new, hp->h_name, hp)) {
155 client_init(nfs_client *clp, const char *hname, struct hostent *hp)
157 xfree(clp->m_hostname);
159 clp->m_hostname = xstrdup(hp->h_name);
161 clp->m_hostname = xstrdup(hname);
167 if (clp->m_type == MCL_SUBNETWORK) {
168 char *cp = strchr(clp->m_hostname, '/');
169 static char slash32[] = "/32";
171 if(!cp) cp = slash32;
173 clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname);
174 if (strchr(cp + 1, '.')) {
175 clp->m_addrlist[1].s_addr = inet_addr(cp+1);
178 int netmask = atoi(cp + 1);
179 if (0 < netmask && netmask <= 32) {
180 clp->m_addrlist[1].s_addr =
181 htonl ((uint32_t) ~0 << (32 - netmask));
184 xlog(L_ERROR, "invalid netmask `%s' for %s",
185 cp + 1, clp->m_hostname);
193 init_addrlist(clp, hp);
198 client_add(nfs_client *clp)
202 if (clp->m_type < 0 || clp->m_type >= MCL_MAXTYPES)
203 xlog(L_FATAL, "unknown client type in client_add");
204 cpp = clientlist + clp->m_type;
206 cpp = &((*cpp)->m_next);
212 client_release(nfs_client *clp)
214 if (clp->m_count <= 0)
215 xlog(L_FATAL, "client_free: m_count <= 0!");
222 nfs_client *clp, **head;
225 for (i = 0; i < MCL_MAXTYPES; i++) {
226 head = clientlist + i;
228 *head = (clp = *head)->m_next;
235 client_resolve(struct in_addr addr)
237 struct hostent *he = NULL;
239 if (clientlist[MCL_WILDCARD] || clientlist[MCL_NETGROUP])
240 he = get_reliable_hostbyaddr((const char*)&addr, sizeof(addr), AF_INET);
242 he = get_hostent((const char*)&addr, sizeof(addr), AF_INET);
248 * client_compose - Make a list of cached hostnames that match an IP address
249 * @he: pointer to hostent containing IP address information to match
251 * Gather all known client hostnames that match the IP address, and sort
252 * the result into a comma-separated list.
254 * Returns a '\0'-terminated ASCII string containing a comma-separated
255 * sorted list of client hostnames, or NULL if no client records matched
256 * the IP address or memory could not be allocated. Caller must free the
257 * returned string with free(3).
260 client_compose(struct hostent *he)
265 for (i = 0 ; i < MCL_MAXTYPES; i++) {
267 for (clp = clientlist[i]; clp ; clp = clp->m_next) {
268 if (!client_check(clp, he))
270 name = add_name(name, clp->m_hostname);
277 * client_member - check if @name is contained in the list @client
278 * @client: '\0'-terminated ASCII string containing
279 * comma-separated list of hostnames
280 * @name: '\0'-terminated ASCII string containing hostname to look for
282 * Returns 1 if @name was found in @client, otherwise zero is returned.
285 client_member(const char *client, const char *name)
287 size_t l = strlen(name);
290 if (strncmp(client, name, l) == 0 &&
291 (client[l] == ',' || client[l] == '\0'))
293 client = strchr(client, ',');
302 name_cmp(const char *a, const char *b)
304 /* compare strings a and b, but only upto ',' in a */
305 while (*a && *b && *a != ',' && *a == *b)
307 if (!*b && (!*a || *a == ','))
310 if (!*a || *a == ',') return -1;
315 add_name(char *old, const char *add)
317 size_t len = strlen(add) + 2;
320 if (old) len += strlen(old);
328 while (cp && *cp && name_cmp(cp, add) < 0) {
329 /* step cp forward over a name */
330 char *e = strchr(cp, ',');
334 cp = cp + strlen(cp);
336 strncpy(new, old, cp-old);
338 if (cp != old && !*cp)
350 * Check each address listed in @hp against each address
351 * stored in @clp. Return 1 if a match is found, otherwise
355 check_fqdn(const nfs_client *clp, const struct hostent *hp)
361 for (ap = hp->h_addr_list; *ap; ap++) {
362 addr = *(struct in_addr *)*ap;
364 for (i = 0; i < clp->m_naddr; i++)
365 if (clp->m_addrlist[i].s_addr == addr.s_addr)
372 * Check each address listed in @hp against the subnetwork or
373 * host address stored in @clp. Return 1 if an address in @hp
374 * matches the host address stored in @clp, otherwise zero.
377 check_subnetwork(const nfs_client *clp, const struct hostent *hp)
382 for (ap = hp->h_addr_list; *ap; ap++) {
383 addr = *(struct in_addr *)*ap;
385 if (!((clp->m_addrlist[0].s_addr ^ addr.s_addr) &
386 clp->m_addrlist[1].s_addr))
393 * Check if a wildcard nfs_client record matches the canonical name
394 * or the aliases of a host. Return 1 if a match is found, otherwise
398 check_wildcard(const nfs_client *clp, const struct hostent *hp)
400 char *cname = clp->m_hostname;
401 char *hname = hp->h_name;
404 if (wildmat(hname, cname))
407 /* See if hname aliases listed in /etc/hosts or nis[+]
408 * match the requested wildcard */
409 for (ap = hp->h_aliases; *ap; ap++) {
410 if (wildmat(*ap, cname))
418 * Check if @hp's hostname or aliases fall in a given netgroup.
419 * Return 1 if @hp represents a host in the netgroup, otherwise zero.
423 check_netgroup(const nfs_client *clp, const struct hostent *hp)
425 const char *netgroup = clp->m_hostname + 1;
426 const char *hname = hp->h_name;
427 struct hostent *nhp = NULL;
428 struct sockaddr_in addr;
432 /* First, try to match the hostname without
433 * splitting off the domain */
434 if (innetgr(netgroup, hname, NULL, NULL))
437 /* See if hname aliases listed in /etc/hosts or nis[+]
438 * match the requested netgroup */
439 for (i = 0; hp->h_aliases[i]; i++) {
440 if (innetgr(netgroup, hp->h_aliases[i], NULL, NULL))
444 /* If hname is ip address convert to FQDN */
445 if (inet_aton(hname, &addr.sin_addr) &&
446 (nhp = gethostbyaddr((const char *)&(addr.sin_addr),
447 sizeof(addr.sin_addr), AF_INET))) {
449 if (innetgr(netgroup, hname, NULL, NULL))
453 /* Okay, strip off the domain (if we have one) */
454 dot = strchr(hname, '.');
459 match = innetgr(netgroup, hname, NULL, NULL);
464 #else /* !HAVE_INNETGR */
466 check_netgroup(__attribute__((unused)) const nfs_client *clp,
467 __attribute__((unused)) const struct hostent *hp)
471 #endif /* !HAVE_INNETGR */
474 * client_check - check if IP address information matches a cached nfs_client
475 * @clp: pointer to a cached nfs_client record
476 * @hp: pointer to hostent containing host IP information
478 * Returns 1 if the address information matches the cached nfs_client,
482 client_check(nfs_client *clp, struct hostent *hp)
484 switch (clp->m_type) {
486 return check_fqdn(clp, hp);
488 return check_subnetwork(clp, hp);
490 return check_wildcard(clp, hp);
492 return check_netgroup(clp, hp);
498 xlog(D_GENERAL, "%s: unrecognized client type: %d",
499 __func__, clp->m_type);
506 client_gettype(char *ident)
510 if (ident[0] == '\0' || strcmp(ident, "*")==0)
511 return MCL_ANONYMOUS;
512 if (strncmp(ident, "gss/", 4) == 0)
514 if (ident[0] == '@') {
516 xlog(L_WARNING, "netgroup support not compiled in");
520 for (sp = ident; *sp; sp++) {
521 if (*sp == '*' || *sp == '?' || *sp == '[')
524 return MCL_SUBNETWORK;
525 if (*sp == '\\' && sp[1])
528 /* check for N.N.N.N */
530 if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
531 sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
532 sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '.') return MCL_FQDN;
533 sp++; if(!isdigit(*sp) || strtoul(sp, &sp, 10) > 255 || *sp != '\0') return MCL_FQDN;
534 /* we lie here a bit. but technically N.N.N.N == N.N.N.N/32 :) */
535 return MCL_SUBNETWORK;