+
+#ifndef GETNAMEINFO
+static const char *
+hp_strerror( int err )
+{
+ switch (err) {
+ case HOST_NOT_FOUND: return _("Host not found (authoritative)");
+ case TRY_AGAIN: return _("Host not found (server fail?)");
+ case NO_RECOVERY: return _("Non-recoverable failure");
+ case NO_DATA: return _("No data of requested type");
+#ifdef NETDB_INTERNAL
+ case NETDB_INTERNAL: return STRERROR( errno );
+#endif
+ }
+ return _("Unknown resolver error");
+}
+#endif
+
+int ldap_pvt_get_hname(
+ const struct sockaddr *sa,
+ int len,
+ char *name,
+ int namelen,
+ char **err )
+{
+ int rc;
+#if defined( HAVE_GETNAMEINFO )
+
+#if defined( LDAP_R_COMPILE )
+ ldap_pvt_thread_mutex_lock( &ldap_int_resolv_mutex );
+#endif
+ rc = getnameinfo( sa, len, name, namelen, NULL, 0, 0 );
+#if defined( LDAP_R_COMPILE )
+ ldap_pvt_thread_mutex_unlock( &ldap_int_resolv_mutex );
+#endif
+ if ( rc ) *err = (char *)AC_GAI_STRERROR( rc );
+ return rc;
+
+#else /* !HAVE_GETNAMEINFO */
+ char *addr;
+ int alen;
+ struct hostent *hp = NULL;
+#ifdef HAVE_GETHOSTBYADDR_R
+ struct hostent hb;
+ int buflen=BUFSTART, h_errno;
+ char *buf=NULL;
+#endif
+
+#ifdef LDAP_PF_INET6
+ if (sa->sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;
+ addr = (char *)&sin->sin6_addr;
+ alen = sizeof(sin->sin6_addr);
+ } else
+#endif
+ if (sa->sa_family == AF_INET) {
+ struct sockaddr_in *sin = (struct sockaddr_in *)sa;
+ addr = (char *)&sin->sin_addr;
+ alen = sizeof(sin->sin_addr);
+ } else {
+ rc = NO_RECOVERY;
+ *err = (char *)hp_strerror( rc );
+ return rc;
+ }
+#if defined( HAVE_GETHOSTBYADDR_R )
+ for(;buflen<BUFMAX;) {
+ if (safe_realloc( &buf, buflen )==NULL) {
+ *err = (char *)STRERROR( ENOMEM );
+ return ENOMEM;
+ }
+#if (GETHOSTBYADDR_R_NARGS < 8)
+ hp=gethostbyaddr_r( addr, alen, sa->sa_family,
+ &hb, buf, buflen, &h_errno );
+ rc = (hp == NULL) ? -1 : 0;
+#else
+ rc = gethostbyaddr_r( addr, alen, sa->sa_family,
+ &hb, buf, buflen,
+ &hp, &h_errno );
+#endif
+#ifdef NETDB_INTERNAL
+ if ((rc<0) &&
+ (h_errno==NETDB_INTERNAL) &&
+ (errno==ERANGE))
+ {
+ buflen*=2;
+ continue;
+ }
+#endif
+ break;
+ }
+ if (hp) {
+ strncpy( name, hp->h_name, namelen );
+ } else {
+ *err = (char *)hp_strerror( h_errno );
+ }
+ LDAP_FREE(buf);
+#else /* HAVE_GETHOSTBYADDR_R */
+
+#if defined( LDAP_R_COMPILE )
+ ldap_pvt_thread_mutex_lock( &ldap_int_resolv_mutex );
+#endif
+ hp = gethostbyaddr( addr, alen, sa->sa_family );
+ if (hp) {
+ strncpy( name, hp->h_name, namelen );
+ rc = 0;
+ } else {
+ rc = h_errno;
+ *err = (char *)hp_strerror( h_errno );
+ }
+#if defined( LDAP_R_COMPILE )
+ ldap_pvt_thread_mutex_unlock( &ldap_int_resolv_mutex );
+#endif
+
+#endif /* !HAVE_GETHOSTBYADDR_R */
+ return rc;
+#endif /* !HAVE_GETNAMEINFO */
+}
+