resolver.c File Reference

DNS resolver. More...

Data Structures
struct	message_header

Macros
#define	MESSAGE_HEADER_LEN   12
#define	MESSAGE_RESPONSE   1
#define	MESSAGE_T_SRV   33
#define	MESSAGE_C_IN   1
#define	BUF_OVERFLOW_CHECK(ptr, len)

Functions
static uint16_t	xmpp_ntohs_ptr (const void *ptr)
static uint8_t	message_header_qr (const struct message_header *header)
static uint8_t	message_header_rcode (const struct message_header *header)
static size_t	message_name_append_safe (char *name, size_t name_len, size_t name_max, const char *tail, size_t tail_len)
static unsigned	message_name_get (const unsigned char *buf, size_t buf_len, unsigned buf_offset, char *name, size_t name_max)
static unsigned	message_name_len (const unsigned char *buf, size_t buf_len, unsigned buf_offset)
static void	resolver_srv_list_sort (resolver_srv_rr_t **srv_rr_list)
int	resolver_srv_lookup_buf (xmpp_ctx_t *ctx, const unsigned char *buf, size_t len, resolver_srv_rr_t **srv_rr_list)
	Perform lookup for RFC1035 message format. More...
int	resolver_srv_lookup (xmpp_ctx_t *ctx, const char *service, const char *proto, const char *domain, resolver_srv_rr_t **srv_rr_list)
	Resolve SRV record. More...
void	resolver_srv_free (xmpp_ctx_t *ctx, resolver_srv_rr_t *srv_rr_list)
	Release a list returned by resolver_srv_lookup() or resolver_srv_lookup_buf(). More...

Detailed Description

DNS resolver.

Macro Definition Documentation

MESSAGE_HEADER_LEN

#define MESSAGE_HEADER_LEN   12

MESSAGE_RESPONSE

#define MESSAGE_RESPONSE   1

MESSAGE_T_SRV

#define MESSAGE_T_SRV   33

MESSAGE_C_IN

#define MESSAGE_C_IN   1

BUF_OVERFLOW_CHECK

#define BUF_OVERFLOW_CHECK	(		ptr,
			len
	)

Value:

do {         \
    if ((ptr) >= (len)) {                         \
        if (*srv_rr_list != NULL)                 \
            resolver_srv_free(ctx, *srv_rr_list); \
        *srv_rr_list = NULL;                      \
        return XMPP_DOMAIN_NOT_FOUND;             \
    }                                             \
} while (0)

Function Documentation

xmpp_ntohs_ptr()

static uint16_t xmpp_ntohs_ptr ( const void *  ptr )

static

message_header_qr()

static uint8_t message_header_qr ( const struct message_header *  header )

static

message_header_rcode()

static uint8_t message_header_rcode ( const struct message_header *  header )

static

message_name_append_safe()

static size_t message_name_append_safe ( char *  name, size_t  name_len, size_t  name_max, const char *  tail, size_t  tail_len  )

static

message_name_get()

static unsigned message_name_get ( const unsigned char *  buf, size_t  buf_len, unsigned  buf_offset, char *  name, size_t  name_max  )

static

message_name_len()

static unsigned message_name_len ( const unsigned char *  buf, size_t  buf_len, unsigned  buf_offset  )

static

resolver_srv_list_sort()

static void resolver_srv_list_sort ( resolver_srv_rr_t **  srv_rr_list )

static

resolver_srv_lookup_buf()

int resolver_srv_lookup_buf	(	xmpp_ctx_t *	ctx,
		const unsigned char *	buf,
		size_t	len,
		resolver_srv_rr_t **	srv_rr_list
	)

Perform lookup for RFC1035 message format.

This function allocates all elements.

Parameters

ctx	a Strophe context object
buf	message in RFC1035 format
len	length of the message
srv_rr_list	is the result

Returns

XMPP_DOMAIN_FOUND on success or XMPP_DOMAIN_NOT_FOUND on fail

resolver_srv_lookup()

int resolver_srv_lookup	(	xmpp_ctx_t *	ctx,
		const char *	service,
		const char *	proto,
		const char *	domain,
		resolver_srv_rr_t **	srv_rr_list
	)

Resolve SRV record.

Parameters

ctx	a Strophe context object
service	service of the SRV record
proto	protocol of the SRV record
domain	resolving domain
srv_rr_list	is the result

Returns

XMPP_DOMAIN_FOUND on success or XMPP_DOMAIN_NOT_FOUND on fail

resolver_srv_free()

void resolver_srv_free	(	xmpp_ctx_t *	ctx,
		resolver_srv_rr_t *	srv_rr_list
	)

Release a list returned by resolver_srv_lookup() or resolver_srv_lookup_buf().

Parameters

ctx	a Strophe context object
srv_rr_list	a list allocated by lookup functions