silcnet.h
- Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+ Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2000 Pekka Riikonen
+ Copyright (C) 1997 - 2007 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
+ the Free Software Foundation; version 2 of the License.
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*/
+/****h* silcutil/SILC Net Interface
+ *
+ * DESCRIPTION
+ *
+ * SILC Net API provides various network routines for applications. It
+ * can be used to create TCP/IP and UDP/IP connections and listeners.
+ * Various utility functions for resolving various information is also
+ * provided.
+ *
+ ***/
+
#ifndef SILCNET_H
#define SILCNET_H
/* Prototypes */
-int silc_net_create_server(int port, char *ip_addr);
-void silc_net_close_server(int sock);
-int silc_net_create_connection(int port, char *host);
-int silc_net_create_connection_async(int port, char *host);
+
+/****s* silcutil/SilcNetAPI/SilcNetListener
+ *
+ * NAME
+ *
+ * typedef struct SilcNetListenerStruct *SilcNetListener;
+ *
+ * DESCRIPTION
+ *
+ * The network listenr context. This context is created with the
+ * silc_net_create_listener function and destroyed with
+ * silc_net_close_listener function.
+ *
+ ***/
+typedef struct SilcNetListenerStruct *SilcNetListener;
+
+/****f* silcutil/SilcNetAPI/SilcNetCallback
+ *
+ * SYNOPSIS
+ *
+ * typedef void (*SilcNetCallback)(SilcResult status,
+ * SilcStream stream, void *context);
+ *
+ * DESCRIPTION
+ *
+ * A callback of this type is returned by silc_net_tcp_create_listener
+ * and silc_net_tcp_connect functions. For silc_net_tcp_create_listener
+ * this callback means that new incoming connection was accepted, and the
+ * `stream' is the socket stream representing the socket connection.
+ *
+ * For silc_net_tcp_connect this means that we have connected to the
+ * remote host and the `stream' is the socket stream for the socket
+ * connection. The SILC Stream API (such as silc_stream_read, etc.) can
+ * be used to read and write to the stream. The created stream is socket
+ * stream so various SilcSocketStream API functions can be used with
+ * the `stream'.
+ *
+ ***/
+typedef void (*SilcNetCallback)(SilcResult status,
+ SilcStream stream, void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_tcp_create_listener
+ *
+ * SYNOPSIS
+ *
+ * SilcNetListener
+ * silc_net_tcp_create_listener(const char **local_ip_addr,
+ * SilcUInt32 local_ip_count, int port,
+ * SilcBool lookup, SilcBool require_fqdn,
+ * SilcSchedule schedule,
+ * SilcNetCallback callback, void *context);
+ *
+ * DESCRIPTION
+ *
+ * This function creates TCP listener. This is used to create network
+ * listener for incoming connections, and `callback' will be called
+ * everytime new connection is received. If `local_ip_addr' is NULL 'any'
+ * address is used. If provided it can be used bind the listener to
+ * `local_ip_count' many IP addresses provided in `local_ip_addr' table.
+ * On success returns the SilcNetListener context, or NULL on error.
+ * If `require_fqdn' is TRUE the listener will require that the incoming
+ * connection has FQDN to be able to connect. If the `lookup' is TRUE
+ * then the incoming connection hostname will be resolved. If the `port'
+ * is zero (0), operating system will define it automatically.
+ *
+ * The `callback' always delivers valid new stream. It is not called
+ * with an error status. If `schedule' is NULL this will call
+ * silc_schedule_get_global to try to get global scheduler.
+ *
+ ***/
+SilcNetListener
+silc_net_tcp_create_listener(const char **local_ip_addr,
+ SilcUInt32 local_ip_count, int port,
+ SilcBool lookup, SilcBool require_fqdn,
+ SilcSchedule schedule,
+ SilcNetCallback callback, void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_tcp_create_listener2
+ *
+ * SYNOPSIS
+ *
+ * SilcNetListener
+ * silc_net_tcp_create_listener2(const char *local_ip_addr, int *ports,
+ * SilcUInt32 port_count,
+ * SilcBool ignore_port_error,
+ * SilcBool lookup, SilcBool require_fqdn,
+ * SilcSchedule schedule,
+ * SilcNetCallback callback, void *context);
+ *
+ * DESCRIPTION
+ *
+ * This function creates TCP listener. This is used to create network
+ * listener for incoming connections, and `callback' will be called
+ * everytime new connection is received. If `local_ip_addr' is NULL 'any'
+ * address is used. If `ports' is NULL or it contains a zero (0) port,
+ * operating system will define it automatically. This function can be
+ * used to bind to many ports at the same time. If `ignore_port_error'
+ * is TRUE this won't return NULL if at least one of the ports could
+ * be bound. Otherwise, NULL will be returned on error.
+ *
+ * If `require_fqdn' is TRUE the listener will require that the incoming
+ * connection has FQDN to be able to connect. If the `lookup' is TRUE
+ * then the incoming connection hostname will be resolved.
+ *
+ * The `callback' always delivers valid new stream. It is not called
+ * with an error status. If `schedule' is NULL this will call
+ * silc_schedule_get_global to try to get global scheduler.
+ *
+ ***/
+SilcNetListener
+silc_net_tcp_create_listener2(const char *local_ip_addr, int *ports,
+ SilcUInt32 port_count,
+ SilcBool ignore_port_error,
+ SilcBool lookup, SilcBool require_fqdn,
+ SilcSchedule schedule,
+ SilcNetCallback callback, void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_listener_get_port
+ *
+ * SYNOPSIS
+ *
+ * SilcUInt16 silc_net_listener_get_port(SilcNetListener listener);
+ *
+ * DESCRIPTION
+ *
+ * Returns the ports to where the `listener' is bound. This can be used
+ * to get the port if none was specified in silc_net_tcp_create_listener.
+ * Returns an array of ports of size of `port_count'. The caller must
+ * free the array with silc_free. There are as many ports in the array
+ * as there were IP addresses provided in silc_net_tcp_create_listener,
+ * as there were ports provided in silc_net_tcp_create_listener2.
+ *
+ ***/
+SilcUInt16 *silc_net_listener_get_port(SilcNetListener listener,
+ SilcUInt32 *port_count);
+
+/****f* silcutil/SilcNetAPI/silc_net_listener_get_ip
+ *
+ * SYNOPSIS
+ *
+ * char **silc_net_listener_get_ip(SilcNetListener listener,
+ * SilcUInt32 *ip_count);
+ *
+ * DESCRIPTION
+ *
+ * Returns the IP's to where the `listener' is bound. Returns an array
+ * of IP addresses of size of `port_count'. The caller must free the
+ * array and its strings with silc_free.
+ *
+ ***/
+char **silc_net_listener_get_ip(SilcNetListener listener,
+ SilcUInt32 *ip_count);
+
+/****f* silcutil/SilcNetAPI/silc_net_listener_get_hostname
+ *
+ * SYNOPSIS
+ *
+ * char **silc_net_listener_get_hostname(SilcNetListener listener,
+ * SilcUInt32 *hostname_count);
+ *
+ * DESCRIPTION
+ *
+ * Returns the hostnames to where the `listener' is bound. Returns an
+ * array of hostnames of size of `port_count'. The caller must free the
+ * array and its strings with silc_free.
+ *
+ ***/
+char **silc_net_listener_get_hostname(SilcNetListener listener,
+ SilcUInt32 *hostname_count);
+
+/****f* silcutil/SilcNetAPI/silc_net_close_listener
+ *
+ * SYNOPSIS
+ *
+ * void silc_net_close_listener(SilcNetListener listener);
+ *
+ * DESCRIPTION
+ *
+ * Closes the network listener indicated by `listener'.
+ *
+ ***/
+void silc_net_close_listener(SilcNetListener listener);
+
+/****f* silcutil/SilcNetAPI/silc_net_tcp_connect
+ *
+ * SYNOPSIS
+ *
+ * SilcAsyncOperation silc_net_tcp_connect(const char *local_ip_addr,
+ * const char *remote_ip_addr,
+ * int remote_port,
+ * SilcSchedule schedule,
+ * SilcNetCallback callback,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * Creates TCP/IP connection to the remote host indicated by `remote_host'
+ * which may be hostname or IP address, on the port indicated by
+ * `remote_port'. If the `local_ip_addr' is provided the local host is
+ * bound to that address before creating the connection. This is
+ * asynchronous call, and this function returns before the connection is
+ * actually established. The `callback' will be called after the
+ * connection is created to deliver the SilcStream for the created
+ * connection. This function supports IPv6 if the platform supports it.
+ *
+ * The returned SilcAsyncOperation context can be used to control the
+ * asynchronous connecting, such as to abort it. If it is aborted
+ * using silc_async_abort the `callback' will not be called. If NULL
+ * is returned the operation cannot be aborted. If `schedule' is NULL
+ * this will call silc_schedule_get_global to try to get global scheduler.
+ *
+ ***/
+SilcAsyncOperation silc_net_tcp_connect(const char *local_ip_addr,
+ const char *remote_ip_addr,
+ int remote_port,
+ SilcSchedule schedule,
+ SilcNetCallback callback,
+ void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_udp_connect
+ *
+ * SYNOPSIS
+ *
+ * SilcStream
+ * silc_net_udp_connect(const char *local_ip_addr, int local_port,
+ * const char *remote_ip_addr, int remote_port,
+ * SilcSchedule schedule);
+ *
+ * DESCRIPTION
+ *
+ * This function creates UDP stream. The UDP stream is bound to the
+ * `local_ip_addr' if it is specified. If `local_port' is non-zero the
+ * stream is bound to that port. If the `remote_ip_addr' and `remote_port'
+ * is also provided, packets may be sent to that address using
+ * silc_stream_write function and packets may be received using
+ * silc_stream_read function.
+ *
+ * If the remote address is not provided the stream is in connectionless
+ * state. This means that packets can be received only by using
+ * silc_net_udp_receive and sent only by using the function
+ * silc_net_udp_send.
+ *
+ * To receive packets the silc_stream_set_notifier must be called for the
+ * returned SilcStream. The packets are always received in the notifier
+ * callback when the SILC_STREAM_CAN_READ is returned to the callback
+ * To read the packet use silc_stream_read if the remote address was
+ * provided, and silc_net_udp_receive if it was not.
+ *
+ * Supports IPv6 if the platform supports it. If `schedule' is NULL this
+ * will call silc_schedule_get_global to try to get global scheduler.
+ *
+ * EXAMPLE
+ *
+ * SilcStream udpstream;
+ *
+ * // Create UDP stream and prepare to receive packets
+ * udpstream = silc_net_udp_connect("10.2.1.7", 5000,
+ * "10.2.1.100, 5000, schedule);
+ * silc_stream_set_notifier(udpstream, schedule, receive_callback, context);
+ *
+ * // Send packet to remote host
+ * silc_stream_write(udpstream, data, data_len);
+ *
+ * Create UDP listener:
+ *
+ * udpstream = silc_net_udp_connect("0.0.0.0", 500, NULL, 0, schedule);
+ * silc_stream_set_notifier(udpstream, schedule, receive_callback, context);
+ *
+ ***/
+SilcStream silc_net_udp_connect(const char *local_ip_addr, int local_port,
+ const char *remote_ip_addr, int remote_port,
+ SilcSchedule schedule);
+
+/****f* silcutil/SilcNetAPI/silc_net_udp_receive
+ *
+ * SYNOPSIS
+ *
+ * int
+ * silc_net_udp_receive(SilcStream stream, char *remote_ip_addr,
+ * SilcUInt32 remote_ip_addr_size, int *remote_port,
+ * unsigned char *ret_data, SilcUInt32 data_size)
+ *
+ * DESCRIPTION
+ *
+ * Receive a UDP packet from the `stream'. The IP address and port of
+ * the sender is returned into `remote_ip_addr' buffer and `remote_port'
+ * pointer. The packet data is returned into the `ret_data' buffer.
+ *
+ * Returns the length of the packet, or -1 on error or 0 in case of EOF.
+ *
+ ***/
+int silc_net_udp_receive(SilcStream stream, char *remote_ip_addr,
+ SilcUInt32 remote_ip_addr_size, int *remote_port,
+ unsigned char *ret_data, SilcUInt32 data_size);
+
+/****f* silcutil/SilcNetAPI/silc_net_udp_send
+ *
+ * SYNOPSIS
+ *
+ * int silc_net_udp_send(SilcStream stream,
+ * const char *remote_ip_addr, int remote_port,
+ * const unsigned char *data, SilcUInt32 data_len);
+ *
+ * DESCRIPTION
+ *
+ * Sends an UDP packet to remote host `remote_ip_addr' on `remote_port'.
+ * This may be used with UDP streams that are not connected to any
+ * specific remote host. With those stream silc_stream_write cannot be
+ * used. In those cases, this function must be used. This may also be
+ * used even if the stream is connected.
+ *
+ * Returns the amount of data written, -1 if data could not be written
+ * at this moment, or -2 if error occurred. If -1 is returned the
+ * notifier callback will later be called with SILC_STREAM_CAN_WRITE
+ * status when stream is again ready for writing.
+ *
+ ***/
+int silc_net_udp_send(SilcStream stream,
+ const char *remote_ip_addr, int remote_port,
+ const unsigned char *data, SilcUInt32 data_len);
+
+/****f* silcutil/SilcNetAPI/silc_net_close_connection
+ *
+ * SYNOPSIS
+ *
+ * void silc_net_close_connection(int sock);
+ *
+ * DESCRIPTION
+ *
+ * Closes the connection by closing the socket connection. This routine
+ * can only be used with POSIX compliant systems.
+ *
+ ***/
void silc_net_close_connection(int sock);
+
+/****f* silcutil/SilcNetAPI/silc_net_accept_connection
+ *
+ * SYNOPSIS
+ *
+ * int silc_net_accept_connection(int sock);
+ *
+ * DESCRIPTION
+ *
+ * Accepts a connection from a particular socket. This routine can only
+ * be used with POSIX compliant systems. This call is equivalent to
+ * accept(2).
+ *
+ ***/
int silc_net_accept_connection(int sock);
-int silc_net_set_socket_nonblock(int sock);
+
+/****f* silcutil/SilcNetAPI/silc_net_set_socket_opt
+ *
+ * SYNOPSIS
+ *
+ * int silc_net_set_socket_opt(int sock, int level, int option, int on);
+ *
+ * DESCRIPTION
+ *
+ * Sets a option for a socket. This function can be used to set
+ * various options for the socket. Some of the options might be
+ * system specific. This routine can only be used with POSIX compliant
+ * systems. This call is equivalent to setsockopt(2);
+ *
+ ***/
int silc_net_set_socket_opt(int sock, int level, int option, int on);
-int silc_net_is_ip(const char *addr);
-void silc_net_check_host_by_sock(int sock, char **hostname, char **ip);
-unsigned short silc_net_get_remote_port(int sock);
-unsigned short silc_net_get_local_port(int sock);
-char *silc_net_localhost();
-#endif
+/****f* silcutil/SilcNetAPI/silc_net_get_socket_opt
+ *
+ * SYNOPSIS
+ *
+ * int silc_net_get_socket_opt(int sock, int level, int option,
+ * void *optval, int *opt_len);
+ *
+ * DESCRIPTION
+ *
+ * Return socket options to the `optval' and `opt_len'. This routine
+ * can only be used with POSIX compliant systems. This call is
+ * equivalent to getsockopt(2).
+ *
+ ***/
+int silc_net_get_socket_opt(int sock, int level, int option,
+ void *optval, int *opt_len);
+
+/****f* silcutil/SilcNetAPI/silc_net_set_socket_nonblock
+ *
+ * SYNOPSIS
+ *
+ * int silc_net_set_socket_nonblock(SilcSocket sock);
+ *
+ * DESCRIPTION
+ *
+ * Sets the socket `sock' to non-blocking mode.
+ *
+ ***/
+int silc_net_set_socket_nonblock(SilcSocket sock);
+
+/****f* silcutil/SilcNetAPI/silc_net_is_ip4
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_is_ip4(const char *addr);
+ *
+ * DESCRIPTION
+ *
+ * Checks whether IP address sent as argument is valid IPv4 address.
+ *
+ ***/
+SilcBool silc_net_is_ip4(const char *addr);
+
+/****f* silcutil/SilcNetAPI/silc_net_is_ip6
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_is_ip6(const char *addr);
+ *
+ * DESCRIPTION
+ *
+ * Checks whether IP address sent as argument is valid IPv6 address.
+ *
+ ***/
+SilcBool silc_net_is_ip6(const char *addr);
+
+/****f* silcutil/SilcNetAPI/silc_net_is_ip
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_is_ip(const char *addr);
+ *
+ * DESCRIPTION
+ *
+ * Checks whether IP address sent as argument is valid IP address.
+ * This supports both IPv4 and IPv6 addresses.
+ *
+ ***/
+SilcBool silc_net_is_ip(const char *addr);
+
+/****f* silcutil/SilcNetAPI/silc_net_addr2bin
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_addr2bin(const char *addr, void *bin,
+ * SilcUInt32 bin_len);
+ *
+ * DESCRIPTION
+ *
+ * Converts the IP number string from numbers-and-dots notation to
+ * binary form in network byte order. The address can be either
+ * IPv4 or IPv6 address.
+ *
+ ***/
+SilcBool silc_net_addr2bin(const char *addr, void *bin, SilcUInt32 bin_len);
+
+/****f* silcutil/SilcNetAPI/SilcNetResolveCallback
+ *
+ * SYNOPSIS
+ *
+ * typedef void (*SilcNetResolveCallback)(const char *result,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * A callback function of this type is called after the asynchronous
+ * resolving operation has been completed. This callback is used
+ * when asynchronously resolving IP addresses and hostnames.
+ *
+ ***/
+typedef void (*SilcNetResolveCallback)(const char *result, void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_gethostbyname
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_gethostbyname(const char *name, SilcBool prefer_ipv6,
+ * char *address, SilcUInt32 address_len);
+ *
+ * DESCRIPTION
+ *
+ * Resolves the IP address of the hostname indicated by the `name'.
+ * This returns TRUE and the IP address of the host to the `address'
+ * buffer, or FALSE if the address could not be resolved. This is
+ * synchronous function and will block the calling process. If the
+ * `prefer_ipv6' is TRUE then this will return IPv6 address if it
+ * finds. If FALSE if returns IPv4 address even if it found IPv6
+ * address also.
+ *
+ ***/
+SilcBool silc_net_gethostbyname(const char *name, SilcBool prefer_ipv6,
+ char *address, SilcUInt32 address_len);
+
+/****f* silcutil/SilcNetAPI/silc_net_gethostbyname_async
+ *
+ * SYNOPSIS
+ *
+ * void silc_net_gethostbyname_async(const char *name,
+ * SilcBool prefer_ipv6,
+ * SilcSchedule schedule,
+ * SilcNetResolveCallback completion,
+ * void *context)
+ *
+ * DESCRIPTION
+ *
+ * Asynchronously resolves the IP address of the hostname indicated
+ * by the `name'. This function returns immediately, and the
+ * `completion' callback will be called after the resolving is
+ * completed. If `schedule' is NULL this will call silc_schedule_get_global
+ * to try to get global scheduler.
+ *
+ * If the `prefer_ipv6' is TRUE then this will return IPv6 address if it
+ * finds. If FALSE if returns IPv4 address even if it found IPv6
+ * address also.
+ *
+ ***/
+void silc_net_gethostbyname_async(const char *name,
+ SilcBool prefer_ipv6,
+ SilcSchedule schedule,
+ SilcNetResolveCallback completion,
+ void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_gethostbyaddr
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_gethostbyaddr(const char *addr, char *name,
+ * SilcUInt32 name_len);
+ *
+x * DESCRIPTION
+ *
+ * Resolves the hostname for the IP address indicated by the `addr'
+ * This returns TRUE and the resolved hostname to the `name' buffer,
+ * or FALSE on error. The `addr' may be either IPv4 or IPv6 address.
+ * This is synchronous function and will block the calling process.
+ *
+ ***/
+SilcBool silc_net_gethostbyaddr(const char *addr, char *name,
+ SilcUInt32 name_len);
+
+/****f* silcutil/SilcNetAPI/silc_net_gethostbyaddr_async
+ *
+ * SYNOPSIS
+ *
+ * void silc_net_gethostbyaddr_async(const char *addr,
+ * SilcSchedule schedule,
+ * SilcNetResolveCallback completion,
+ * void *context)
+ *
+ * DESCRIPTION
+ *
+ * Asynchronously resolves the hostname for the IP address indicated
+ * by the `addr'. This function returns immediately, and the
+ * `completion' callback will be called after the resolving is
+ * completed. If `schedule' is NULL this will call silc_schedule_get_global
+ * to try to get global scheduler.
+ *
+ ***/
+void silc_net_gethostbyaddr_async(const char *addr,
+ SilcSchedule schedule,
+ SilcNetResolveCallback completion,
+ void *context);
+
+/****f* silcutil/SilcNetAPI/silc_net_check_host_by_sock
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_check_host_by_sock(SilcSocket sock, char **hostname,
+ * char **ip);
+ *
+ * DESCRIPTION
+ *
+ * Performs lookups for remote name and IP address. This peforms reverse
+ * lookup as well to verify that the IP has FQDN.
+ *
+ ***/
+SilcBool silc_net_check_host_by_sock(SilcSocket sock, char **hostname,
+ char **ip);
+
+/****f* silcutil/SilcNetAPI/silc_net_check_local_by_sock
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_net_check_local_by_sock(SilcSocket sock, char **hostname,
+ * char **ip);
+ *
+ * DESCRIPTION
+ *
+ * Performs lookups for local name and IP address. This peforms reverse
+ * lookup as well to verify that the IP has FQDN.
+ *
+ ***/
+SilcBool silc_net_check_local_by_sock(SilcSocket sock, char **hostname,
+ char **ip);
+
+/****f* silcutil/SilcNetAPI/silc_net_get_remote_port
+ *
+ * SYNOPSIS
+ *
+ * SilcUInt16 silc_net_get_remote_port(SilcSocket sock);
+ *
+ * DESCRIPTION
+ *
+ * Return remote port by socket.
+ *
+ ***/
+SilcUInt16 silc_net_get_remote_port(SilcSocket sock);
+
+/****f* silcutil/SilcNetAPI/silc_net_get_local_port
+ *
+ * SYNOPSIS
+ *
+ * SilcUInt16 silc_net_get_local_port(SilcSocket sock);
+ *
+ * DESCRIPTION
+ *
+ * Return local port by socket.
+ *
+ ***/
+SilcUInt16 silc_net_get_local_port(SilcSocket sock);
+
+/****f* silcutil/SilcNetAPI/silc_net_localhost
+ *
+ * SYNOPSIS
+ *
+ * char *silc_net_localhost(void);
+ *
+ * DESCRIPTION
+ *
+ * Return name of localhost. This will also attempt to resolve
+ * the real hostname by the local host's IP address. If unsuccessful
+ * the first found hostname is returned. The caller must free
+ * returned hostname.
+ *
+ ***/
+char *silc_net_localhost(void);
+
+/****f* silcutil/SilcNetAPI/silc_net_localip
+ *
+ * SYNOPSIS
+ *
+ * char *silc_net_localip(void)
+ *
+ * DESCRIPTION
+ *
+ * Return IP of localhost. The caller must free the returned IP.
+ *
+ ***/
+char *silc_net_localip(void);
+
+#include "silcnet_i.h"
+
+#endif /* SILCNET_H */