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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 188 of file dns.c.
References ast_log(), ast_mutex_lock(), ast_mutex_unlock(), dns_parse_answer(), LOG_DEBUG, LOG_WARNING, and MAX_SIZE.
Referenced by ast_get_enum(), ast_get_srv(), and ast_get_txt().
00191 { 00192 #if HAVE_RES_NINIT 00193 struct __res_state dnsstate; 00194 #endif 00195 unsigned char answer[MAX_SIZE]; 00196 int res, ret = -1; 00197 00198 #if HAVE_RES_NINIT 00199 res_ninit(&dnsstate); 00200 res = res_nsearch(&dnsstate, dname, class, type, answer, sizeof(answer)); 00201 #else 00202 ast_mutex_lock(&res_lock); 00203 res_init(); 00204 res = res_search(dname, class, type, answer, sizeof(answer)); 00205 #endif 00206 if (res > 0) { 00207 if ((res = dns_parse_answer(context, class, type, answer, res, callback)) < 0) { 00208 ast_log(LOG_WARNING, "DNS Parse error for %s\n", dname); 00209 ret = -1; 00210 } 00211 else if (ret == 0) { 00212 ast_log(LOG_DEBUG, "No matches found in DNS for %s\n", dname); 00213 ret = 0; 00214 } 00215 else 00216 ret = 1; 00217 } 00218 #if HAVE_RES_NINIT 00219 res_nclose(&dnsstate); 00220 #else 00221 #ifndef __APPLE__ 00222 res_close(); 00223 #endif 00224 ast_mutex_unlock(&res_lock); 00225 #endif 00226 00227 return ret; 00228 }