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Functions | |
int | ast_search_dns (void *context, const char *dname, int class, int type, int(*callback)(void *context, unsigned char *answer, int len, unsigned char *fullanswer)) |
Perform DNS lookup (used by DNS, enum and SRV lookups). |
Definition in file dns.h.
int ast_search_dns | ( | void * | context, | |
const char * | dname, | |||
int | class, | |||
int | type, | |||
int(*)(void *context, unsigned char *answer, int len, unsigned char *fullanswer) | callback | |||
) |
Perform DNS lookup (used by DNS, enum and SRV lookups).
Definition at line 255 of file dns.c.
References ast_debug, ast_log(), ast_mutex_lock, ast_mutex_unlock, dns_parse_answer(), LOG_WARNING, and MAX_SIZE.
Referenced by ast_get_enum(), ast_get_srv(), ast_srv_lookup(), blr_ebl(), and blr_txt().
00258 { 00259 #ifdef HAVE_RES_NINIT 00260 struct __res_state dnsstate; 00261 #endif 00262 unsigned char answer[MAX_SIZE]; 00263 int res, ret = -1; 00264 00265 #ifdef HAVE_RES_NINIT 00266 memset(&dnsstate, 0, sizeof(dnsstate)); 00267 res_ninit(&dnsstate); 00268 res = res_nsearch(&dnsstate, dname, class, type, answer, sizeof(answer)); 00269 #else 00270 ast_mutex_lock(&res_lock); 00271 res_init(); 00272 res = res_search(dname, class, type, answer, sizeof(answer)); 00273 #endif 00274 if (res > 0) { 00275 if ((res = dns_parse_answer(context, class, type, answer, res, callback)) < 0) { 00276 ast_log(LOG_WARNING, "DNS Parse error for %s\n", dname); 00277 ret = -1; 00278 } else if (res == 0) { 00279 ast_debug(1, "No matches found in DNS for %s\n", dname); 00280 ret = 0; 00281 } else 00282 ret = 1; 00283 } 00284 #ifdef HAVE_RES_NINIT 00285 #ifdef HAVE_RES_NDESTROY 00286 res_ndestroy(&dnsstate); 00287 #else 00288 res_nclose(&dnsstate); 00289 #endif 00290 #else 00291 #ifdef HAVE_RES_CLOSE 00292 res_close(); 00293 #endif 00294 ast_mutex_unlock(&res_lock); 00295 #endif 00296 00297 return ret; 00298 }