+/*

+ * 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 */