/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 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_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 APR_TCP_DEFER_ACCEPT 32768 /**< Delay accepting of new connections * until data is available. * @see apr_socket_accept_filter */ /** @} */ /** 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_INADDR_NONE * Not all platforms have a real INADDR_NONE. This macro replaces * INADDR_NONE on all platforms. */ #ifdef INADDR_NONE #define APR_INADDR_NONE INADDR_NONE #else #define APR_INADDR_NONE ((unsigned int) 0xffffffff) #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 /** @def APR_INET6 * IPv6 Address Family. Not all platforms may have this defined. */ #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 used to denote either the local and remote endpoint of a * connection. */ typedef enum { APR_LOCAL, /**< Socket information for local end of connection */ APR_REMOTE /**< Socket information for remote end of connection */ } 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; /** 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; /** 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 #if APR_HAVE_SA_STORAGE /** Placeholder to ensure that the size of this union is not * dependent on whether APR_HAVE_IPV6 is defined. */ struct sockaddr_storage sas; #endif } sa; }; #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. * @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 for the apr_socket_t and associated storage. */ APR_DECLARE(apr_status_t) apr_socket_create(apr_socket_t **new_sock, int family, int type, int protocol, apr_pool_t *cont); /** * Shutdown either reading, writing, or both sides of a socket. * @param thesocket The socket to close * @param how How to shutdown the socket. One of: * <PRE> * APR_SHUTDOWN_READ no longer allow read requests * APR_SHUTDOWN_WRITE no longer allow write requests * APR_SHUTDOWN_READWRITE no longer allow read or write requests * </PRE> * @see apr_shutdown_how_e * @remark This does not actually close the socket descriptor, it just * controls which calls are still valid on the socket. */ APR_DECLARE(apr_status_t) apr_socket_shutdown(apr_socket_t *thesocket, apr_shutdown_how_e how); /** * Close a socket. * @param thesocket The socket to close */ APR_DECLARE(apr_status_t) apr_socket_close(apr_socket_t *thesocket); /** * Bind the socket to its associated port * @param sock The socket to bind * @param sa The socket address to bind to * @remark This may be where we will find out if there is any other process * using the selected port. */ APR_DECLARE(apr_status_t) apr_socket_bind(apr_socket_t *sock, apr_sockaddr_t *sa); /** * Listen to a bound socket for connections. * @param sock The socket to listen on * @param backlog The number of outstanding connections allowed in the sockets * listen queue. If this value is less than zero, the listen * queue size is set to zero. */ APR_DECLARE(apr_status_t) apr_socket_listen(apr_socket_t *sock, apr_int32_t backlog); /** * Accept a new connection request * @param new_sock A copy of the socket that is connected to the socket that * made the connection request. This is the socket which should * be used for all future communication. * @param sock The socket we are listening on. * @param connection_pool The pool for the new socket. */ APR_DECLARE(apr_status_t) apr_socket_accept(apr_socket_t **new_sock, apr_socket_t *sock, apr_pool_t *connection_pool); /** * Issue a connection request to a socket either on the same machine * or a different one. * @param sock The socket we wish to use for our side of the connection * @param sa The address of the machine we wish to connect to. */ APR_DECLARE(apr_status_t) apr_socket_connect(apr_socket_t *sock, apr_sockaddr_t *sa); /** * Create apr_sockaddr_t from hostname, address family, and port. * @param sa The new apr_sockaddr_t. * @param hostname The hostname or numeric address string to resolve/parse, or * NULL to build an address that corresponds to 0.0.0.0 or :: * @param family The address family to use, or APR_UNSPEC if the system should * decide. * @param port The port number. * @param flags Special processing flags: * <PRE> * APR_IPV4_ADDR_OK first query for IPv4 addresses; only look * for IPv6 addresses if the first query failed; * only valid if family is APR_UNSPEC and hostname * isn't NULL; mutually exclusive with * APR_IPV6_ADDR_OK * APR_IPV6_ADDR_OK first query for IPv6 addresses; only look * for IPv4 addresses if the first query failed; * only valid if family is APR_UNSPEC and hostname * isn't NULL and APR_HAVE_IPV6; mutually exclusive * with APR_IPV4_ADDR_OK * </PRE> * @param p The pool for the apr_sockaddr_t and associated storage. */ APR_DECLARE(apr_status_t) apr_sockaddr_info_get(apr_sockaddr_t **sa, const char *hostname, apr_int32_t family, apr_port_t port, apr_int32_t flags, apr_pool_t *p); /** * Look up the host name from an apr_sockaddr_t. * @param hostname The hostname. * @param sa The apr_sockaddr_t. * @param flags Special processing flags. */ APR_DECLARE(apr_status_t) apr_getnameinfo(char **hostname, apr_sockaddr_t *sa, apr_int32_t flags); /** * Parse hostname/IP address with scope id and port. * * Any of the following strings are accepted: * 8080 (just the port number) * www.apache.org (just the hostname) * www.apache.org:8080 (hostname and port number) * [fe80::1]:80 (IPv6 numeric address string only) * [fe80::1%eth0] (IPv6 numeric address string and scope id) * * Invalid strings: * (empty string) * [abc] (not valid IPv6 numeric address string) * abc:65536 (invalid port number) * * @param addr The new buffer containing just the hostname. On output, *addr * will be NULL if no hostname/IP address was specfied. * @param scope_id The new buffer containing just the scope id. On output, * *scope_id will be NULL if no scope id was specified. * @param port The port number. On output, *port will be 0 if no port was * specified. * ### FIXME: 0 is a legal port (per RFC 1700). this should * ### return something besides zero if the port is missing. * @param str The input string to be parsed. * @param p The pool from which *addr and *scope_id are allocated. * @remark If scope id shouldn't be allowed, check for scope_id != NULL in * addition to checking the return code. If addr/hostname should be * required, check for addr == NULL in addition to checking the * return code. */ APR_DECLARE(apr_status_t) apr_parse_addr_port(char **addr, char **scope_id, apr_port_t *port, const char *str, apr_pool_t *p); /** * Get name of the current machine * @param buf A buffer to store the hostname in. * @param len The maximum length of the hostname that can be stored in the * buffer provided. The suggested length is APRMAXHOSTLEN + 1. * @param cont The pool to use. * @remark If the buffer was not large enough, an error will be returned. */ APR_DECLARE(apr_status_t) apr_gethostname(char *buf, int len, apr_pool_t *cont); /** * Return the data associated with the current socket * @param data The user data associated with the socket. * @param key The key to associate with the user data. * @param sock The currently open socket. */ APR_DECLARE(apr_status_t) apr_socket_data_get(void **data, const char *key, apr_socket_t *sock); /** * Set the data associated with the current socket. * @param sock The currently open socket. * @param data The user data to associate with the socket. * @param key The key to associate with the data. * @param cleanup The cleanup to call when the socket is destroyed. */ APR_DECLARE(apr_status_t) apr_socket_data_set(apr_socket_t *sock, void *data, const char *key, apr_status_t (*cleanup)(void*)); /** * Send data over a network. * @param sock The socket to send the data over. * @param buf The buffer which contains the data to be sent. * @param len On entry, the number of bytes to send; on exit, the number * of bytes sent. * @remark * <PRE> * This functions acts like a blocking write by default. To change * this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK * socket option. * * It is possible for both bytes to be sent and an error to be returned. * * APR_EINTR is never returned. * </PRE> */ APR_DECLARE(apr_status_t) apr_socket_send(apr_socket_t *sock, const char *buf, apr_size_t *len); /** * Send multiple packets of data over a network. * @param sock The socket to send the data over. * @param vec The array of iovec structs containing the data to send * @param nvec The number of iovec structs in the array * @param len Receives the number of bytes actually written * @remark * <PRE> * This functions acts like a blocking write by default. To change * this behavior, use apr_socket_timeout_set() or the APR_SO_NONBLOCK * socket option. * The number of bytes actually sent is stored in argument 3. * * It is possible for both bytes to be sent and an error to be returned. * * APR_EINTR is never returned. * </PRE> */ APR_DECLARE(apr_status_t) apr_socket_sendv(apr_socket_t *sock, const struct iovec *vec, apr_int32_t nvec, apr_size_t *len); /** * @param sock The socket to send from * @param where The apr_sockaddr_t describing where to send the data * @param flags The flags to use * @param buf The data to send * @param len The length of the data to send */ APR_DECLARE(apr_status_t) apr_socket_sendto(apr_socket_t *sock, apr_sockaddr_t *where, apr_int32_t flags, const char *buf, apr_size_t *len); /** * Read data from a socket. On success, the address of the peer from * which the data was sent is copied into the @param from parameter, * and the @param len parameter is updated to give the number of bytes * written to @param buf. * @param from Updated with the address from which the data was received * @param sock The socket to use * @param flags The flags to use * @param buf The buffer to use * @param len The length of the available buffer */ APR_DECLARE(apr_status_t) apr_socket_recvfrom(apr_sockaddr_t *from, apr_socket_t *sock, apr_int32_t flags, char *buf, apr_size_t *len); #if APR_HAS_SENDFILE || defined(DOXYGEN) /** * Send a file from an open file descriptor to a socket, along with * optional headers and trailers * @param sock The socket to which we're writing * @param file The open file from which to read * @param hdtr A structure containing the headers and trailers to send * @param offset Offset into the file where we should begin writing * @param len (input) - Number of bytes to send from the file * (output) - Number of bytes actually sent, * including headers, file, and trailers * @param flags APR flags that are mapped to OS specific flags * @remark This functions acts like a blocking write by default. To change * this behavior, use apr_socket_timeout_set() or the * APR_SO_NONBLOCK socket option. * The number of bytes actually sent is stored in the len parameter. * The offset parameter is passed by reference for no reason; its * value will never be modified by the apr_socket_sendfile() function. */ APR_DECLARE(apr_status_t) apr_socket_sendfile(apr_socket_t *sock, apr_file_t *file, apr_hdtr_t *hdtr, apr_off_t *offset, apr_size_t *len, apr_int32_t flags); #endif /* APR_HAS_SENDFILE */ /** * Read data from a network. * @param sock The socket to read the data from. * @param buf The buffer to store the data in. * @param len On entry, the number of bytes to receive; on exit, the number * of bytes received. * @remark * <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 */
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