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sock : Add DNS-SRV list sorted by priority and weight, check result connection.

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This commit is contained in:
Chih-Wei Chen
2016-07-18 17:34:26 +08:00
committed by Dmitry Podgorny
parent f46cf669a3
commit 171b285cbe
3 changed files with 152 additions and 47 deletions
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32
src/resolver.h
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@@ -17,25 +17,35 @@
#define __LIBSTROPHE_RESOLVER_H__
#include "ostypes.h"
#include "common.h"
/** Perform lookup for RFC1035 message format. */
int resolver_srv_lookup_buf(const unsigned char *buf, size_t len,
char *target, size_t target_len,
unsigned short *port);
typedef enum {
XMPP_DOMAIN_NOT_FOUND,
XMPP_DOMAIN_FOUND,
XMPP_DOMAIN_ALTDOMAIN
} xmpp_domain_state_t;
typedef struct resolver_srv_rr_struc {
uint16_t priority;
uint16_t weight;
uint16_t port;
char target[MAX_DOMAIN_LEN];
struct resolver_srv_rr_struc *next;
}resolver_srv_rr_t;
/* This function allocates all elements including the 1st one. (*srv_rr_list) is the result */
int resolver_srv_lookup_buf(xmpp_ctx_t *ctx, const unsigned char *buf, size_t len,
resolver_srv_rr_t **srv_rr_list);
/** Resolve SRV record.
*
* @param service service of the SRV record
* @param proto protocol of the SRV record
* @param domain resolving domain
* @param target pre-allocated string where result is stored
* @param target_len maximum size of the target
* @param port pointer where resulting port is stored
* @param srv_rr_list is the result
*
* @return 1 on success or 0 on fail
* @return XMPP_DOMAIN_FOUND on success or XMPP_DOMAIN_NOT_FOUND on fail
*/
int resolver_srv_lookup(const char *service, const char *proto,
const char *domain, char *target,
size_t target_len, unsigned short *port);
int resolver_srv_lookup(xmpp_ctx_t *ctx, const char *service, const char *proto,
const char *domain, resolver_srv_rr_t **srv_rr_list);
#endif /* __LIBSTROPHE_RESOLVER_H__ */