apr_network_io.h

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 * <PRE>
 * This functions acts like a blocking read by default.  To change 
 * this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK
 * socket option.
 * The number of bytes actually received is stored in argument 3.
 *
 * It is possible for both bytes to be received and an APR_EOF or
 * other error to be returned.
 *
 * APR_EINTR is never returned.
 * </PRE>
 */
APR_DECLARE(apr_status_t) apr_socket_recv(apr_socket_t *sock, 
                                   char *buf, apr_size_t *len);

/**
 * Setup socket options for the specified socket
 * @param sock The socket to set up.
 * @param opt The option we would like to configure.  One of:
 * <PRE>
 *            APR_SO_DEBUG      --  turn on debugging information 
 *            APR_SO_KEEPALIVE  --  keep connections active
 *            APR_SO_LINGER     --  lingers on close if data is present
 *            APR_SO_NONBLOCK   --  Turns blocking on/off for socket
 *                                  When this option is enabled, use
 *                                  the APR_STATUS_IS_EAGAIN() macro to
 *                                  see if a send or receive function
 *                                  could not transfer data without
 *                                  blocking.
 *            APR_SO_REUSEADDR  --  The rules used in validating addresses
 *                                  supplied to bind should allow reuse
 *                                  of local addresses.
 *            APR_SO_SNDBUF     --  Set the SendBufferSize
 *            APR_SO_RCVBUF     --  Set the ReceiveBufferSize
 * </PRE>
 * @param on Value for the option.
 */
APR_DECLARE(apr_status_t) apr_socket_opt_set(apr_socket_t *sock,
                                             apr_int32_t opt, apr_int32_t on);

/**
 * Setup socket timeout for the specified socket
 * @param sock The socket to set up.
 * @param t Value for the timeout.
 * <PRE>
 *   t > 0  -- read and write calls return APR_TIMEUP if specified time
 *             elapsess with no data read or written
 *   t == 0 -- read and write calls never block
 *   t < 0  -- read and write calls block
 * </PRE>
 */
APR_DECLARE(apr_status_t) apr_socket_timeout_set(apr_socket_t *sock,
                                                 apr_interval_time_t t);

/**
 * Query socket options for the specified socket
 * @param sock The socket to query
 * @param opt The option we would like to query.  One of:
 * <PRE>
 *            APR_SO_DEBUG      --  turn on debugging information 
 *            APR_SO_KEEPALIVE  --  keep connections active
 *            APR_SO_LINGER     --  lingers on close if data is present
 *            APR_SO_NONBLOCK   --  Turns blocking on/off for socket
 *            APR_SO_REUSEADDR  --  The rules used in validating addresses
 *                                  supplied to bind should allow reuse
 *                                  of local addresses.
 *            APR_SO_SNDBUF     --  Set the SendBufferSize
 *            APR_SO_RCVBUF     --  Set the ReceiveBufferSize
 *            APR_SO_DISCONNECTED -- Query the disconnected state of the socket.
 *                                  (Currently only used on Windows)
 * </PRE>
 * @param on Socket option returned on the call.
 */
APR_DECLARE(apr_status_t) apr_socket_opt_get(apr_socket_t *sock, 
                                             apr_int32_t opt, apr_int32_t *on);

/**
 * Query socket timeout for the specified socket
 * @param sock The socket to query
 * @param t Socket timeout returned from the query.
 */
APR_DECLARE(apr_status_t) apr_socket_timeout_get(apr_socket_t *sock, 
                                                 apr_interval_time_t *t);

/**
 * Query the specified socket if at the OOB/Urgent data mark
 * @param sock The socket to query
 * @param atmark Is set to true if socket is at the OOB/urgent mark,
 *               otherwise is set to false.
 */
APR_DECLARE(apr_status_t) apr_socket_atmark(apr_socket_t *sock, 
                                            int *atmark);

/**
 * Return an address associated with a socket; either the address to
 * which the socket is bound locally or the the address of the peer
 * to which the socket is connected.
 * @param sa The returned apr_sockaddr_t.
 * @param which Whether to retrieve the local or remote address
 * @param sock The socket to use
 */
APR_DECLARE(apr_status_t) apr_socket_addr_get(apr_sockaddr_t **sa,
                                              apr_interface_e which,
                                              apr_socket_t *sock);
 
/**
 * Return the IP address (in numeric address string format) in
 * an APR socket address.  APR will allocate storage for the IP address 
 * string from the pool of the apr_sockaddr_t.
 * @param addr The IP address.
 * @param sockaddr The socket address to reference.
 */
APR_DECLARE(apr_status_t) apr_sockaddr_ip_get(char **addr, 
                                              apr_sockaddr_t *sockaddr);

/**
 * Write the IP address (in numeric address string format) of the APR
 * socket address @a sockaddr into the buffer @a buf (of size @a buflen).
 * @param sockaddr The socket address to reference.
 */
APR_DECLARE(apr_status_t) apr_sockaddr_ip_getbuf(char *buf, apr_size_t buflen,
                                                 apr_sockaddr_t *sockaddr);

/**
 * See if the IP addresses in two APR socket addresses are
 * equivalent.  Appropriate logic is present for comparing
 * IPv4-mapped IPv6 addresses with IPv4 addresses.
 *
 * @param addr1 One of the APR socket addresses.
 * @param addr2 The other APR socket address.
 * @remark The return value will be non-zero if the addresses
 * are equivalent.
 */
APR_DECLARE(int) apr_sockaddr_equal(const apr_sockaddr_t *addr1,
                                    const apr_sockaddr_t *addr2);

/**
* Return the type of the socket.
* @param sock The socket to query.
* @param type The returned type (e.g., SOCK_STREAM).
*/
APR_DECLARE(apr_status_t) apr_socket_type_get(apr_socket_t *sock,
                                              int *type);
 
/**
 * Given an apr_sockaddr_t and a service name, set the port for the service
 * @param sockaddr The apr_sockaddr_t that will have its port set
 * @param servname The name of the service you wish to use
 */
APR_DECLARE(apr_status_t) apr_getservbyname(apr_sockaddr_t *sockaddr, 
                                            const char *servname);
/**
 * Build an ip-subnet representation from an IP address and optional netmask or
 * number-of-bits.
 * @param ipsub The new ip-subnet representation
 * @param ipstr The input IP address string
 * @param mask_or_numbits The input netmask or number-of-bits string, or NULL
 * @param p The pool to allocate from
 */
APR_DECLARE(apr_status_t) apr_ipsubnet_create(apr_ipsubnet_t **ipsub, 
                                              const char *ipstr, 
                                              const char *mask_or_numbits, 
                                              apr_pool_t *p);

/**
 * Test the IP address in an apr_sockaddr_t against a pre-built ip-subnet
 * representation.
 * @param ipsub The ip-subnet representation
 * @param sa The socket address to test
 * @return non-zero if the socket address is within the subnet, 0 otherwise
 */
APR_DECLARE(int) apr_ipsubnet_test(apr_ipsubnet_t *ipsub, apr_sockaddr_t *sa);

#if APR_HAS_SO_ACCEPTFILTER || defined(DOXYGEN)
/**
 * Set an OS level accept filter.
 * @param sock The socket to put the accept filter on.
 * @param name The accept filter
 * @param args Any extra args to the accept filter.  Passing NULL here removes
 *             the accept filter. 
 */
apr_status_t apr_socket_accept_filter(apr_socket_t *sock, char *name,
                                      char *args);
#endif

/**
 * Return the protocol of the socket.
 * @param sock The socket to query.
 * @param protocol The returned protocol (e.g., APR_PROTO_TCP).
 */
APR_DECLARE(apr_status_t) apr_socket_protocol_get(apr_socket_t *sock,
                                                  int *protocol);

/**
 * Get the pool used by the socket.
 */
APR_POOL_DECLARE_ACCESSOR(socket);

/**
 * Set a socket to be inherited by child processes.
 */
APR_DECLARE_INHERIT_SET(socket);

/**
 * Unset a socket from being inherited by child processes.
 */
APR_DECLARE_INHERIT_UNSET(socket);

/**
 * @defgroup apr_mcast IP Multicast
 * @{
 */

/**
 * Join a Multicast Group
 * @param sock The socket to join a multicast group
 * @param join The address of the multicast group to join
 * @param iface Address of the interface to use.  If NULL is passed, the 
 *              default multicast interface will be used. (OS Dependent)
 * @param source Source Address to accept transmissions from (non-NULL 
 *               implies Source-Specific Multicast)
 */
APR_DECLARE(apr_status_t) apr_mcast_join(apr_socket_t *sock,
                                         apr_sockaddr_t *join,
                                         apr_sockaddr_t *iface,
                                         apr_sockaddr_t *source);

/**
 * Leave a Multicast Group.  All arguments must be the same as
 * apr_mcast_join.
 * @param sock The socket to leave a multicast group
 * @param addr The address of the multicast group to leave
 * @param iface Address of the interface to use.  If NULL is passed, the 
 *              default multicast interface will be used. (OS Dependent)
 * @param source Source Address to accept transmissions from (non-NULL 
 *               implies Source-Specific Multicast)
 */
APR_DECLARE(apr_status_t) apr_mcast_leave(apr_socket_t *sock,
                                          apr_sockaddr_t *addr,
                                          apr_sockaddr_t *iface,
                                          apr_sockaddr_t *source);

/**
 * Set the Multicast Time to Live (ttl) for a multicast transmission.
 * @param sock The socket to set the multicast ttl
 * @param ttl Time to live to Assign. 0-255, default=1
 * @remark If the TTL is 0, packets will only be seen by sockets on 
 * the local machine, and only when multicast loopback is enabled.
 */
APR_DECLARE(apr_status_t) apr_mcast_hops(apr_socket_t *sock,
                                         apr_byte_t ttl);

/**
 * Toggle IP Multicast Loopback
 * @param sock The socket to set multicast loopback
 * @param opt 0=disable, 1=enable
 */
APR_DECLARE(apr_status_t) apr_mcast_loopback(apr_socket_t *sock,
                                             apr_byte_t opt);


/**
 * Set the Interface to be used for outgoing Multicast Transmissions.
 * @param sock The socket to set the multicast interface on
 * @param iface Address of the interface to use for Multicast
 */
APR_DECLARE(apr_status_t) apr_mcast_interface(apr_socket_t *sock,
                                              apr_sockaddr_t *iface);

/** @} */

/** @} */

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_NETWORK_IO_H */