include/osmocom/core/socket.h

#ifndef _OSMOCORE_SOCKET_H
#define _OSMOCORE_SOCKET_H

/*! \file socket.h
 *  \brief Osmocom socket convenience functions
 */

#include <stdint.h>

struct sockaddr;

/* flags for osmo_sock_init. */
#define OSMO_SOCK_F_CONNECT	(1 << 0)
#define OSMO_SOCK_F_BIND	(1 << 1)
#define OSMO_SOCK_F_NONBLOCK	(1 << 2)

/*! \brief Initialize a socket (including bind/connect)
 *  \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
 *  \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
 *  \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
 *  \param[in] host remote host name or IP address in string form
 *  \param[in] port remote port number in host byte order
 *  \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
 *
 * This function creates a new socket of the designated \a family, \a
 * type and \a proto and optionally binds or connects it, depending on
 * the value of \a flags parameter.
 */
int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
		   const char *host, uint16_t port, unsigned int flags);

/*! \brief Initialize a socket and fill \ref osmo_fd
 *  \param[out] osmocom file descriptor (will be filled in)
 *  \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
 *  \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
 *  \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
 *  \param[in] host remote host name or IP address in string form
 *  \param[in] port remote port number in host byte order
 *  \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
 *
 * This function creates (and optionall binds/connects) a socket using
 * \ref osmo_sock_init, but also fills the \a ofd structure.
 */
int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto,
			const char *host, uint16_t port, unsigned int flags);

/*! \brief Initialize a socket and fill \ref sockaddr
 *  \param[out] ss socket address (will be filled in)
 *  \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
 *  \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
 *  \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
 *
 * This function creates (and optionall binds/connects) a socket using
 * \ref osmo_sock_init, but also fills the \a ss structure.
 */
int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type,
		      uint8_t proto, unsigned int flags);

/*! \brief Determine if the given address is a local address
 *  \param[in] addr Socket Address
 *  \param[in] addrlen Length of socket address in bytes
 *  \returns 1 if address is local, 0 otherwise.
 */
int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen);

#endif /* _OSMOCORE_SOCKET_H */