apr_network_io.h

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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_NETWORK_IO_H
#define APR_NETWORK_IO_H
/**
 * @file apr_network_io.h
 * @brief APR Network library
 */

#include "apr.h"
#include "apr_pools.h"
#include "apr_file_io.h"
#include "apr_errno.h"
#include "apr_inherit.h" 

#if APR_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup apr_network_io Network Routines
 * @ingroup APR 
 * @{
 */

#ifndef APR_MAX_SECS_TO_LINGER
/** Maximum seconds to linger */
#define APR_MAX_SECS_TO_LINGER 30
#endif

#ifndef MAX_SECS_TO_LINGER
/** @deprecated @see APR_MAX_SECS_TO_LINGER */
#define MAX_SECS_TO_LINGER APR_MAX_SECS_TO_LINGER
#endif

#ifndef APRMAXHOSTLEN
/** Maximum hostname length */
#define APRMAXHOSTLEN 256
#endif

#ifndef APR_ANYADDR
/** Default 'any' address */
#define APR_ANYADDR "0.0.0.0"
#endif

/**
 * @defgroup apr_sockopt Socket option definitions
 * @{
 */
#define APR_SO_LINGER        1    /**< Linger */
#define APR_SO_KEEPALIVE     2    /**< Keepalive */
#define APR_SO_DEBUG         4    /**< Debug */
#define APR_SO_NONBLOCK      8    /**< Non-blocking IO */
#define APR_SO_REUSEADDR     16   /**< Reuse addresses */
#define APR_SO_TIMEOUT       32   /**< Timeout */
#define APR_SO_SNDBUF        64   /**< Send buffer */
#define APR_SO_RCVBUF        128  /**< Receive buffer */
#define APR_SO_DISCONNECTED  256  /**< Disconnected */
#define APR_TCP_NODELAY      512  /**< For SCTP sockets, this is mapped
                                   * to STCP_NODELAY internally.
                                   */
#define APR_TCP_NOPUSH       1024 /**< No push */
#define APR_RESET_NODELAY    2048 /**< This flag is ONLY set internally
                                   * when we set APR_TCP_NOPUSH with
                                   * APR_TCP_NODELAY set to tell us that
                                   * APR_TCP_NODELAY should be turned on
                                   * again when NOPUSH is turned off
                                   */
#define APR_INCOMPLETE_READ 4096  /**< Set on non-blocking sockets
				   * (timeout != 0) on which the
				   * previous read() did not fill a buffer
				   * completely.  the next apr_socket_recv() 
                                   * will first call select()/poll() rather than
				   * going straight into read().  (Can also
				   * be set by an application to force a
				   * select()/poll() call before the next
				   * read, in cases where the app expects
				   * that an immediate read would fail.)
				   */
#define APR_INCOMPLETE_WRITE 8192 /**< like APR_INCOMPLETE_READ, but for write
                                   * @see APR_INCOMPLETE_READ
                                   */
#define APR_IPV6_V6ONLY     16384 /**< Don't accept IPv4 connections on an
                                   * IPv6 listening socket.
                                   */

/** @} */

/** Define what type of socket shutdown should occur. */
typedef enum {
    APR_SHUTDOWN_READ,          /**< no longer allow read request */
    APR_SHUTDOWN_WRITE,         /**< no longer allow write requests */
    APR_SHUTDOWN_READWRITE      /**< no longer allow read or write requests */
} apr_shutdown_how_e;

#define APR_IPV4_ADDR_OK  0x01  /**< @see apr_sockaddr_info_get() */
#define APR_IPV6_ADDR_OK  0x02  /**< @see apr_sockaddr_info_get() */

#if (!APR_HAVE_IN_ADDR)
/**
 * We need to make sure we always have an in_addr type, so APR will just
 * define it ourselves, if the platform doesn't provide it.
 */
struct in_addr {
    apr_uint32_t  s_addr; /**< storage to hold the IP# */
};
#endif

/**
 * @def APR_INET
 * Not all platforms have these defined, so we'll define them here
 * The default values come from FreeBSD 4.1.1
 */
#define APR_INET     AF_INET
/** @def APR_UNSPEC
 * Let the system decide which address family to use
 */
#ifdef AF_UNSPEC
#define APR_UNSPEC   AF_UNSPEC
#else
#define APR_UNSPEC   0
#endif
#if APR_HAVE_IPV6
#define APR_INET6    AF_INET6
#endif

/**
 * @defgroup IP_Proto IP Protocol Definitions for use when creating sockets
 * @{
 */
#define APR_PROTO_TCP       6   /**< TCP  */
#define APR_PROTO_UDP      17   /**< UDP  */
#define APR_PROTO_SCTP    132   /**< SCTP */
/** @} */

/**
 * Enum to tell us if we're interested in remote or local socket
 */
typedef enum {
    APR_LOCAL,
    APR_REMOTE
} apr_interface_e;

/**
 * The specific declaration of inet_addr's ... some platforms fall back
 * inet_network (this is not good, but necessary)
 */

#if APR_HAVE_INET_ADDR
#define apr_inet_addr    inet_addr
#elif APR_HAVE_INET_NETWORK        /* only DGUX, as far as I know */
/**
 * @warning
 * not generally safe... inet_network() and inet_addr() perform
 * different functions */
#define apr_inet_addr    inet_network
#endif

/** A structure to represent sockets */
typedef struct apr_socket_t     apr_socket_t;
/**
 * A structure to encapsulate headers and trailers for apr_socket_sendfile
 */
typedef struct apr_hdtr_t       apr_hdtr_t;
/** A structure to represent in_addr */
typedef struct in_addr          apr_in_addr_t;
/** A structure to represent an IP subnet */
typedef struct apr_ipsubnet_t apr_ipsubnet_t;

/** @remark use apr_uint16_t just in case some system has a short that isn't 16 bits... */
typedef apr_uint16_t            apr_port_t;

/** @remark It's defined here as I think it should all be platform safe...
 * @see apr_sockaddr_t
 */
typedef struct apr_sockaddr_t apr_sockaddr_t;
/**
 * APRs socket address type, used to ensure protocol independence
 */
struct apr_sockaddr_t {
    /** The pool to use... */
    apr_pool_t *pool;
    /** The hostname */
    char *hostname;
    /** Either a string of the port number or the service name for the port */
    char *servname;
    /** The numeric port */
    apr_port_t port;
    /** The family */
    apr_int32_t family;
    /** Union of either IPv4 or IPv6 sockaddr. */
    union {
        /** IPv4 sockaddr structure */
        struct sockaddr_in sin;
#if APR_HAVE_IPV6
        /** IPv6 sockaddr structure */
        struct sockaddr_in6 sin6;
#endif
    } sa;
    /** How big is the sockaddr we're using? */
    apr_socklen_t salen;
    /** How big is the ip address structure we're using? */
    int ipaddr_len;
    /** How big should the address buffer be?  16 for v4 or 46 for v6
     *  used in inet_ntop... */
    int addr_str_len;
    /** This points to the IP address structure within the appropriate
     *  sockaddr structure.  */
    void *ipaddr_ptr;
    /** If multiple addresses were found by apr_sockaddr_info_get(), this 
     *  points to a representation of the next address. */
    apr_sockaddr_t *next;
};

#if APR_HAS_SENDFILE
/** 
 * Support reusing the socket on platforms which support it (from disconnect,
 * specifically Win32.
 * @remark Optional flag passed into apr_socket_sendfile() 
 */
#define APR_SENDFILE_DISCONNECT_SOCKET      1
#endif

/** A structure to encapsulate headers and trailers for apr_socket_sendfile */
struct apr_hdtr_t {
    /** An iovec to store the headers sent before the file. */
    struct iovec* headers;
    /** number of headers in the iovec */
    int numheaders;
    /** An iovec to store the trailers sent after the file. */
    struct iovec* trailers;
    /** number of trailers in the iovec */
    int numtrailers;
};

/* function definitions */

/**
 * Create a socket.
 * @remark With APR 1.0, this function follows the prototype 
 * of apr_socket_create_ex.
 * @param new_sock The new socket that has been set up.
 * @param family The address family of the socket (e.g., APR_INET).
 * @param type The type of the socket (e.g., SOCK_STREAM).
 * @param cont The pool to use
 */
APR_DECLARE(apr_status_t) apr_socket_create(apr_socket_t **new_sock, 
                                            int family, int type,
                                            apr_pool_t *cont);

/**
 * Create a socket.
 * @remark With APR 1.0, this function is deprecated and apr_socket_create 
 * follows this prototype.
 * @param new_sock The new socket that has been set up.
 * @param family The address family of the socket (e.g., APR_INET).
 * @param type The type of the socket (e.g., SOCK_STREAM).
 * @param protocol The protocol of the socket (e.g., APR_PROTO_TCP).
 * @param cont The pool to use
 */
APR_DECLARE(apr_status_t) apr_socket_create_ex(apr_socket_t **new_sock, 
                                               int family, int type,
                                               int protocol,
                                               apr_pool_t *cont);