3 * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
4 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
8 * locate LDAP servers using DNS SRV records.
9 * Location code based on MIT Kerberos KDC location code.
15 #include <ac/stdlib.h>
18 #include <ac/socket.h>
19 #include <ac/string.h>
24 #ifdef HAVE_ARPA_NAMESER_H
25 #include <arpa/nameser.h>
31 /* Sometimes this is not defined. */
37 LDAP_CONST char *dn_in,
44 if( dn_in == NULL || domainp == NULL ) {
48 dn = ldap_explode_dn( dn_in, 0 );
54 for( i=0; dn[i] != NULL; i++ ) {
55 char ** rdn = ldap_explode_rdn( dn[i], 0 );
57 if( rdn == NULL || *rdn == NULL ) {
65 #define LDAP_DCOID "0.9.2342.19200300.100.1.25="
67 if( rdn[1] == NULL ) {
71 if( strncasecmp( rdn[0],
72 LDAP_DC, sizeof(LDAP_DC)-1 ) == 0 )
74 dc = &rdn[0][sizeof(LDAP_DC)-1];
76 } else if( strncmp( rdn[0],
77 LDAP_DCOID, sizeof(LDAP_DCOID)-1 ) == 0 )
79 dc = &rdn[0][sizeof(LDAP_DCOID)-1];
89 /* dc value is empty! */
97 ndomain = LDAP_REALLOC( domain,
98 ( domain == NULL ? 0 : strlen(domain) )
101 if( ndomain == NULL ) {
109 if( domain != NULL ) {
110 strcat( ndomain, "." );
112 strcat( ndomain, dc );
128 LDAP_CONST char *domain_in,
131 char *domain, *s, *tok_r, *dn;
134 if (domain_in == NULL || dnp == NULL) {
135 return LDAP_NO_MEMORY;
137 domain = LDAP_STRDUP(domain_in);
138 if (domain == NULL) {
139 return LDAP_NO_MEMORY;
144 for (s = ldap_pvt_strtok(domain, ".", &tok_r);
146 s = ldap_pvt_strtok(NULL, ".", &tok_r)) {
147 size_t len = strlen(s);
149 dn = (char *) LDAP_REALLOC(dn, loc + sizeof(",dc=") + len );
152 return LDAP_NO_MEMORY;
155 /* not first time. */
156 strcpy(dn + loc, ",");
159 strcpy(dn + loc, "dc=");
160 loc += sizeof("dc=")-1;
174 * Lookup and return LDAP servers for domain (using the DNS
175 * SRV record _ldap._tcp.domain).
177 int ldap_domain2hostlist(
178 LDAP_CONST char *domain,
181 #ifdef HAVE_RES_SEARCH
184 char *hostlist = NULL;
185 int rc, len, cur = 0;
186 unsigned char reply[1024];
188 if( domain == NULL || *domain == '\0' ) {
189 return LDAP_PARAM_ERROR;
193 return LDAP_PARAM_ERROR;
196 request = LDAP_MALLOC(strlen(domain) + sizeof("_ldap._tcp."));
197 if (request == NULL) {
201 sprintf(request, "_ldap._tcp.%s", domain);
203 #ifdef LDAP_R_COMPILE
204 ldap_pvt_thread_mutex_lock(&ldap_int_resolv_mutex);
207 len = res_search(request, C_IN, T_SRV, reply, sizeof(reply));
213 /* int priority, weight; */
215 /* Parse out query */
218 status = dn_expand(reply, reply + len, p, host, sizeof(host));
225 while (p < reply + len) {
226 int type, class, ttl, size;
227 status = dn_expand(reply, reply + len, p, host, sizeof(host));
232 type = (p[0] << 8) | p[1];
234 class = (p[0] << 8) | p[1];
236 ttl = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
238 size = (p[0] << 8) | p[1];
242 status = dn_expand(reply, reply + len, p + 6, host, sizeof(host));
246 /* ignore priority and weight for now */
247 /* priority = (p[0] << 8) | p[1]; */
248 /* weight = (p[2] << 8) | p[3]; */
249 port = (p[4] << 8) | p[5];
251 buflen = strlen(host) + sizeof(":65355");
252 hostlist = (char *) LDAP_REALLOC(hostlist, cur + buflen);
253 if (hostlist == NULL) {
258 /* not first time around */
259 hostlist[cur++] = ' ';
261 cur += sprintf(&hostlist[cur], "%s:%hd", host, port);
266 if (hostlist == NULL) {
267 /* No LDAP servers found in DNS. */
268 rc = LDAP_UNAVAILABLE;
276 #ifdef LDAP_R_COMPILE
277 ldap_pvt_thread_mutex_unlock(&ldap_int_resolv_mutex);
280 if (request != NULL) {
283 if (rc != LDAP_SUCCESS && hostlist != NULL) {
288 return LDAP_NOT_SUPPORTED;
289 #endif /* HAVE_RES_SEARCH */