Support for DNS SRV records, used in to locate SIP services. More...
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Functions | |
int | ast_get_srv (struct ast_channel *chan, char *host, int hostlen, int *port, const char *service) |
Support for DNS SRV records, used in to locate SIP services.
Definition in file srv.h.
int ast_get_srv | ( | struct ast_channel * | chan, |
char * | host, | ||
int | hostlen, | ||
int * | port, | ||
const char * | service | ||
) |
Lookup entry in SRV records Returns 1 if found, 0 if not found, -1 on hangup Only do SRV record lookup if you get a domain without a port. If you get a port #, it's a DNS host name.
chan | Ast channel |
host | host name (return value) |
hostlen | Length of string "host" |
port | Port number (return value) |
service | Service tag for SRV lookup (like "_sip._udp" or "_stun._udp" |
Definition at line 200 of file srv.c.
References ast_autoservice_start(), ast_autoservice_stop(), ast_copy_string(), ast_free, AST_LIST_HEAD_NOLOCK_INIT_VALUE, AST_LIST_REMOVE_HEAD, ast_search_dns(), ast_verb, srv_context::entries, srv_context::have_weights, srv_entry::host, srv_entry::port, process_weights(), and srv_callback().
Referenced by ast_get_ip_or_srv(), and create_addr().
{ struct srv_context context = { .entries = AST_LIST_HEAD_NOLOCK_INIT_VALUE }; struct srv_entry *current; int ret; if (chan && ast_autoservice_start(chan) < 0) return -1; ret = ast_search_dns(&context, service, C_IN, T_SRV, srv_callback); if (context.have_weights) process_weights(&context); if (chan) ret |= ast_autoservice_stop(chan); /* TODO: there could be a "." entry in the returned list of answers... if so, this requires special handling */ /* the list of entries will be sorted in the proper selection order already, so we just need the first one (if any) */ if ((ret > 0) && (current = AST_LIST_REMOVE_HEAD(&context.entries, list))) { ast_copy_string(host, current->host, hostlen); *port = current->port; ast_free(current); ast_verb(4, "ast_get_srv: SRV lookup for '%s' mapped to host %s, port %d\n", service, host, *port); } else { host[0] = '\0'; *port = -1; } while ((current = AST_LIST_REMOVE_HEAD(&context.entries, list))) ast_free(current); return ret; }