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/*
* net.h
*
* DNS Resolver definitions
*
* a Net::DNS like library for C
*
* (c) NLnet Labs, 2005-2006
*
* See the file LICENSE for the license
*/
#ifndef LDNS_NET_H
#define LDNS_NET_H
#include <ldns/ldns.h>
@include_sys_socket_h@
#ifdef __cplusplus
extern "C" {
#endif
#define LDNS_DEFAULT_TIMEOUT_SEC 5
#define LDNS_DEFAULT_TIMEOUT_USEC 0
/**
* \file
*
* Contains functions to send and receive packets over a network.
*/
/**
* Sends a buffer to an ip using udp and return the respons as a ldns_pkt
* \param[in] qbin the ldns_buffer to be send
* \param[in] to the ip addr to send to
* \param[in] tolen length of the ip addr
* \param[in] timeout the timeout value for the network
* \param[out] answersize size of the packet
* \param[out] result packet with the answer
* \return status
*/
ldns_status ldns_udp_send(uint8_t **result, ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout, size_t *answersize);
/**
* Send an udp query and don't wait for an answer but return
* the socket
* \param[in] qbin the ldns_buffer to be send
* \param[in] to the ip addr to send to
* \param[in] tolen length of the ip addr
* \param[in] timeout *unused*, was the timeout value for the network
* \return the socket used
*/
int ldns_udp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout);
/**
* Send an tcp query and don't wait for an answer but return
* the socket
* \param[in] qbin the ldns_buffer to be send
* \param[in] to the ip addr to send to
* \param[in] tolen length of the ip addr
* \param[in] timeout the timeout value for the connect attempt
* \return the socket used
*/
int ldns_tcp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout);
/**
* Sends a buffer to an ip using tcp and return the respons as a ldns_pkt
* \param[in] qbin the ldns_buffer to be send
* \param[in] qbin the ldns_buffer to be send
* \param[in] to the ip addr to send to
* \param[in] tolen length of the ip addr
* \param[in] timeout the timeout value for the network
* \param[out] answersize size of the packet
* \param[out] result packet with the answer
* \return status
*/
ldns_status ldns_tcp_send(uint8_t **result, ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout, size_t *answersize);
/**
* Sends ptk to the nameserver at the resolver object. Returns the data
* as a ldns_pkt
*
* \param[out] pkt packet received from the nameserver
* \param[in] r the resolver to use
* \param[in] query_pkt the query to send
* \return status
*/
ldns_status ldns_send(ldns_pkt **pkt, ldns_resolver *r, const ldns_pkt *query_pkt);
/**
* Sends and ldns_buffer (presumably containing a packet to the nameserver at the resolver object. Returns the data
* as a ldns_pkt
*
* \param[out] pkt packet received from the nameserver
* \param[in] r the resolver to use
* \param[in] qb the buffer to send
* \param[in] tsig_mac the tsig MAC to authenticate the response with (NULL to do no TSIG authentication)
* \return status
*/
ldns_status ldns_send_buffer(ldns_pkt **pkt, ldns_resolver *r, ldns_buffer *qb, ldns_rdf *tsig_mac);
/**
* Create a tcp socket to the specified address
* \param[in] to ip and family
* \param[in] tolen length of to
* \param[in] timeout timeout for the connect attempt
* \return a socket descriptor
*/
int ldns_tcp_connect(const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout);
/**
* Create a udp socket to the specified address
* \param[in] to ip and family
* \param[in] timeout *unused*, was timeout for the socket
* \return a socket descriptor
*/
int ldns_udp_connect(const struct sockaddr_storage *to, struct timeval timeout);
/**
* send a query via tcp to a server. Don't want for the answer
*
* \param[in] qbin the buffer to send
* \param[in] sockfd the socket to use
* \param[in] to which ip to send it
* \param[in] tolen socketlen
* \return number of bytes sent
*/
ssize_t ldns_tcp_send_query(ldns_buffer *qbin, int sockfd, const struct sockaddr_storage *to, socklen_t tolen);
/**
* send a query via udp to a server. Don;t want for the answer
*
* \param[in] qbin the buffer to send
* \param[in] sockfd the socket to use
* \param[in] to which ip to send it
* \param[in] tolen socketlen
* \return number of bytes sent
*/
ssize_t ldns_udp_send_query(ldns_buffer *qbin, int sockfd, const struct sockaddr_storage *to, socklen_t tolen);
/**
* Gives back a raw packet from the wire and reads the header data from the given
* socket. Allocates the data (of size size) itself, so don't forget to free
*
* \param[in] sockfd the socket to read from
* \param[out] size the number of bytes that are read
* \param[in] timeout the time allowed between packets.
* \return the data read
*/
uint8_t *ldns_tcp_read_wire_timeout(int sockfd, size_t *size, struct timeval timeout);
/**
* This routine may block. Use ldns_tcp_read_wire_timeout, it checks timeouts.
* Gives back a raw packet from the wire and reads the header data from the given
* socket. Allocates the data (of size size) itself, so don't forget to free
*
* \param[in] sockfd the socket to read from
* \param[out] size the number of bytes that are read
* \return the data read
*/
uint8_t *ldns_tcp_read_wire(int sockfd, size_t *size);
/**
* Gives back a raw packet from the wire and reads the header data from the given
* socket. Allocates the data (of size size) itself, so don't forget to free
*
* \param[in] sockfd the socket to read from
* \param[in] fr the address of the client (if applicable)
* \param[in] *frlen the lenght of the client's addr (if applicable)
* \param[out] size the number of bytes that are read
* \return the data read
*/
uint8_t *ldns_udp_read_wire(int sockfd, size_t *size, struct sockaddr_storage *fr, socklen_t *frlen);
/**
* returns the native sockaddr representation from the rdf.
* \param[in] rd the ldns_rdf to operate on
* \param[in] port what port to use. 0 means; use default (53)
* \param[out] size what is the size of the sockaddr_storage
* \return struct sockaddr* the address in the format so other
* functions can use it (sendto)
*/
struct sockaddr_storage * ldns_rdf2native_sockaddr_storage(const ldns_rdf *rd, uint16_t port, size_t *size);
/**
* returns an rdf with the sockaddr info. works for ip4 and ip6
* \param[in] sock the struct sockaddr_storage to convert
* \param[in] port what port was used. When NULL this is not set
* \return ldns_rdf* wth the address
*/
ldns_rdf * ldns_sockaddr_storage2rdf(struct sockaddr_storage *sock, uint16_t *port);
/**
* Prepares the resolver for an axfr query
* The query is sent and the answers can be read with ldns_axfr_next
* \param[in] resolver the resolver to use
* \param[in] domain the domain to exfr
* \param[in] c the class to use
* \return ldns_status the status of the transfer
*/
ldns_status ldns_axfr_start(ldns_resolver *resolver, ldns_rdf *domain, ldns_rr_class c);
#ifdef __cplusplus
}
#endif
#endif /* LDNS_NET_H */
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