5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2006 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
20 /****h* silcutil/SILC Net Interface
24 * SILC Net API provides various network routines for applications. It
25 * can be used to create TCP/IP and UDP/IP connections and listeners.
26 * Various utility functions for resolving various information is also
29 * On WIN32 systems the SILC Net API must initialized by calling the
30 * silc_net_win32_init and uninitialized when the application ends by
31 * calling the silc_net_win32_uninit function. The initializing must be
32 * done in order to assure that the SILC Net API works correctly.
41 /****s* silcutil/SilcNetAPI/SilcNetListener
45 * typedef struct SilcNetListenerStruct *SilcNetListener;
49 * The network listenr context. This context is created with the
50 * silc_net_create_listener function and destroyed with
51 * silc_net_close_listener function.
54 typedef struct SilcNetListenerStruct *SilcNetListener;
56 /****d* silcutil/SilcNetAPI/SilcNetStatus
60 * typedef enum { ... } SilcNetStatus;
64 * Status to indicate the result of the network operation creation. This
65 * type is returned in the SilcNetCallback callback function.
70 SILC_NET_OK, /* Everything Ok */
71 SILC_NET_UNKNOWN_IP, /* Unknown IP address */
72 SILC_NET_UNKNOWN_HOST, /* Unknown hostname */
73 SILC_NET_HOST_UNREACHABLE, /* Destination unreachable */
74 SILC_NET_CONNECTION_REFUSED, /* Connection refused */
75 SILC_NET_CONNECTION_TIMEOUT, /* Connection timedout */
76 SILC_NET_NO_MEMORY, /* System out of memory */
77 SILC_NET_ERROR, /* Unknown error */
81 /****f* silcutil/SilcNetAPI/SilcNetCallback
85 * typedef void (*SilcNetCallback)(SilcNetStatus status,
86 * SilcStream stream, void *context);
90 * A callback of this type is returned by silc_net_tcp_create_listener,
91 * silc_net_udp_create_listener, silc_net_tcp_connect and
92 * silc_net_udp_connect functions. For silc_net_tcp_create_listener
93 * and silc_net_udp_create_listener this callback means that new incoming
94 * connection was accepted, and the `stream' is the socket stream
95 * representing the socket connection.
97 * For silc_net_tcp_connect and silc_net_udp_connect this means that we
98 * have connected to the remote host and the `stream' is the socket
99 * stream for the socket connection. The SILC Stream API (such as
100 * silc_stream_read, etc.) can be used to read and write to the stream.
101 * The created stream is socket stream so various SilcSocketStream API
102 * functions can be used with the `stream'.
105 typedef void (*SilcNetCallback)(SilcNetStatus status,
106 SilcStream stream, void *context);
108 /****f* silcutil/SilcNetAPI/silc_net_tcp_create_listener
113 * silc_net_tcp_create_listener(const char **local_ip_addr,
114 * SilcUInt32 local_ip_count,
115 * int port, SilcBool require_fqdn,
116 * SilcSchedule schedule,
117 * SilcNetCallback callback, void *context);
121 * This function creates TCP listener etc. This is used to create network
122 * listener for incoming connections, and `callback' will be called
123 * everytime new connection is received. If `local_ip_addr' is NULL any
124 * address is used. If provided it can be used bind the listener to
125 * `local_ip_count' many IP addresses provided in `local_ip_addr' table.
126 * On success returns the SilcNetListener context, or NULL on error.
127 * If `require_fqdn' is TRUE the listener will require that the incoming
128 * connection has FQDN to be able to connect.
132 silc_net_tcp_create_listener(const char **local_ip_addr,
133 SilcUInt32 local_ip_count,
134 int port, SilcBool require_fqdn,
135 SilcSchedule schedule,
136 SilcNetCallback callback, void *context);
138 /****f* silcutil/SilcNetAPI/silc_net_close_listener
142 * void silc_net_close_listener(SilcNetListener listener);
146 * Closes the network listener indicated by `listener'.
149 void silc_net_close_listener(SilcNetListener listener);
151 /****f* silcutil/SilcNetAPI/silc_net_tcp_connect
155 * SilcAsyncOperation silc_net_tcp_connect(const char *local_ip_addr,
156 * const char *remote_ip_addr,
158 * SilcSchedule schedule,
159 * SilcNetCallback callback,
164 * Creates TCP/IP connection to the remote host indicated by `remote_host'
165 * which may be hostname or IP address, on the port indicated by
166 * `remote_port'. If the `local_ip_addr' is provided the local host is
167 * bound to that address before creating the connection. This is
168 * asynchronous call, and this function returns before the connection is
169 * actually established. The `callback' will be called after the
170 * connection is created to deliver the SilcStream for the created
173 * The returned SilcAsyncOperation context can be used to control the
174 * asynchronous connecting, such as to abort it. If it is aborted
175 * using silc_async_abort the `callback' will not be called. If NULL
176 * is returned the operation cannot be aborted and the `callback' will
177 * be called eventually.
180 SilcAsyncOperation silc_net_tcp_connect(const char *local_ip_addr,
181 const char *remote_ip_addr,
183 SilcSchedule schedule,
184 SilcNetCallback callback,
187 /****f* silcutil/SilcNetAPI/silc_net_udp_connect
192 * silc_net_udp_connect(const char *local_ip_addr, int local_port,
193 * const char *remote_ip_addr, int remote_port,
194 * SilcSchedule schedule);
198 * This function creates UDP stream. The UDP stream is bound to the
199 * `local_ip_addr' if it is specified. The `local_port' must always be
200 * specified. If the `remote_ip_addr' and `remote_port' is also provided,
201 * packets may be sent to that address using silc_stream_write function
202 * and packets may be received using silc_stream_read function.
204 * If the remote address is not provided then packets may only be received
205 * by using silc_net_udp_receive and sent only by using the function
208 * To receive packets the silc_stream_set_notifier must be called for the
209 * returned SilcStream. The packets are always received in the notifier
210 * callback when the SILC_STREAM_CAN_READ is returned to the callback
211 * To read the packet use silc_stream_read if the remote address was
212 * provided, and silc_net_udp_receive if it was not.
216 * SilcStream udpstream;
218 * // Create UDP stream and prepare to receive packets
219 * udpstream = silc_net_udp_connect("10.2.1.7", 5000,
220 * "10.2.1.100, 5000, schedule);
221 * silc_stream_set_notifier(udpstream, schedule, receive_callback, context);
223 * // Send packet to remote host
224 * silc_stream_write(udpstream, data, data_len);
228 silc_net_udp_connect(const char *local_ip_addr, int local_port,
229 const char *remote_ip_addr, int remote_port,
230 SilcSchedule schedule);
232 /****f* silcutil/SilcNetAPI/silc_net_udp_receive
237 * silc_net_udp_receive(SilcStream stream, char *remote_ip_addr,
238 * SilcUInt32 remote_ip_addr_size, int *remote_port,
239 * unsigned char *ret_data, SilcUInt32 data_size)
243 * Receive a UDP packet from the `stream'. The IP address and port of
244 * the sender is returned into `remote_ip_addr' buffer and `remote_port'
245 * pointer. The packet data is returned into the `ret_data' buffer.
247 * Returns the length of the packet, or -1 on error or 0 in case of EOF.
250 int silc_net_udp_receive(SilcStream stream, char *remote_ip_addr,
251 SilcUInt32 remote_ip_addr_size, int *remote_port,
252 unsigned char *ret_data, SilcUInt32 data_size);
254 /****f* silcutil/SilcNetAPI/silc_net_udp_send
258 * void silc_net_udp_send(SilcStream stream,
259 * const char *remote_ip_addr, int remote_port,
260 * const unsigned char *data, SilcUInt32 data_len);
264 * Sends an UDP packet to remote host `remote_ip_addr' on `remote_port'.
265 * This may be used with UDP streams that are not connected to any
266 * specific remote host. With those stream silc_stream_write cannot be
267 * used. In those cases, this function must be used. This may also be
268 * used even if the stream is connected.
270 * This function always succeeds, however there is no guarantee that the
271 * packet is delivered, as UDP is unreliable transport protocol.
274 void silc_net_udp_send(SilcStream stream,
275 const char *remote_ip_addr, int remote_port,
276 const unsigned char *data, SilcUInt32 data_len);
278 /****f* silcutil/SilcNetAPI/silc_net_close_connection
282 * void silc_net_close_connection(int sock);
286 * Closes the connection by closing the socket connection.
289 void silc_net_close_connection(int sock);
291 /****f* silcutil/SilcNetAPI/silc_net_accept_connection
295 * int silc_net_accept_connection(int sock);
299 * Accepts a connection from a particular socket.
302 int silc_net_accept_connection(int sock);
304 /****f* silcutil/SilcNetAPI/silc_net_set_socket_nonblock
308 * int silc_net_set_socket_nonblock(int sock);
312 * Sets the socket to non-blocking mode.
315 int silc_net_set_socket_nonblock(int sock);
317 /****f* silcutil/SilcNetAPI/silc_net_set_socket_opt
321 * int silc_net_set_socket_opt(int sock, int level, int option, int on);
325 * Sets a option for a socket. This function can be used to set
326 * various options for the socket. Some of the options might be
330 int silc_net_set_socket_opt(int sock, int level, int option, int on);
332 /****f* silcutil/SilcNetAPI/silc_net_get_socket_opt
336 * int silc_net_get_socket_opt(int sock, int level, int option,
337 * void *optval, int *opt_len);
341 * Return socket options to the `optval' and `opt_len'.
344 int silc_net_get_socket_opt(int sock, int level, int option,
345 void *optval, int *opt_len);
347 /****f* silcutil/SilcNetAPI/silc_net_is_ip4
351 * SilcBool silc_net_is_ip4(const char *addr);
355 * Checks whether IP address sent as argument is valid IPv4 address.
358 SilcBool silc_net_is_ip4(const char *addr);
360 /****f* silcutil/SilcNetAPI/silc_net_is_ip6
364 * SilcBool silc_net_is_ip6(const char *addr);
368 * Checks whether IP address sent as argument is valid IPv6 address.
371 SilcBool silc_net_is_ip6(const char *addr);
373 /****f* silcutil/SilcNetAPI/silc_net_is_ip
377 * SilcBool silc_net_is_ip(const char *addr);
381 * Checks whether IP address sent as argument is valid IP address.
382 * This supports both IPv4 and IPv6 addresses.
385 SilcBool silc_net_is_ip(const char *addr);
387 /****f* silcutil/SilcNetAPI/silc_net_addr2bin
391 * SilcBool silc_net_addr2bin(const char *addr, void *bin, SilcUInt32 bin_len);
395 * Converts the IP number string from numbers-and-dots notation to
396 * binary form in network byte order. The address can be either
397 * IPv4 or IPv6 address.
400 SilcBool silc_net_addr2bin(const char *addr, void *bin, SilcUInt32 bin_len);
402 /****f* silcutil/SilcNetAPI/SilcNetResolveCallback
406 * typedef void (*SilcNetResolveCallback)(const char *result,
411 * A callback function of this type is called after the asynchronous
412 * resolving operation has been completed. This callback is used
413 * when asynchronously resolving IP addresses and hostnames.
416 typedef void (*SilcNetResolveCallback)(const char *result, void *context);
418 /****f* silcutil/SilcNetAPI/silc_net_gethostbyname
422 * SilcBool silc_net_gethostbyname(const char *name, SilcBool prefer_ipv6,
423 * char *address, SilcUInt32 address_len);
427 * Resolves the IP address of the hostname indicated by the `name'.
428 * This returns TRUE and the IP address of the host to the `address'
429 * buffer, or FALSE if the address could not be resolved. This is
430 * synchronous function and will block the calling process. If the
431 * `prefer_ipv6' is TRUE then this will return IPv6 address if it
432 * finds. If FALSE if returns IPv4 address even if it found IPv6
436 SilcBool silc_net_gethostbyname(const char *name, SilcBool prefer_ipv6,
437 char *address, SilcUInt32 address_len);
439 /****f* silcutil/SilcNetAPI/silc_net_gethostbyname_async
443 * void silc_net_gethostbyname_async(const char *name,
444 * SilcBool prefer_ipv6,
445 * SilcSchedule schedule,
446 * SilcNetResolveCallback completion,
451 * Asynchronously resolves the IP address of the hostname indicated
452 * by the `name'. This function returns immediately, and the
453 * `completion' callback will be called after the resolving is
456 * If the `prefer_ipv6' is TRUE then this will return IPv6 address if it
457 * finds. If FALSE if returns IPv4 address even if it found IPv6
461 void silc_net_gethostbyname_async(const char *name,
462 SilcBool prefer_ipv6,
463 SilcSchedule schedule,
464 SilcNetResolveCallback completion,
467 /****f* silcutil/SilcNetAPI/silc_net_gethostbyaddr
471 * SilcBool silc_net_gethostbyaddr(const char *addr, char *name,
472 * SilcUInt32 name_len);
476 * Resolves the hostname for the IP address indicated by the `addr'
477 * This returns TRUE and the resolved hostname to the `name' buffer,
478 * or FALSE on error. The `addr' may be either IPv4 or IPv6 address.
479 * This is synchronous function and will block the calling process.
482 SilcBool silc_net_gethostbyaddr(const char *addr, char *name,
483 SilcUInt32 name_len);
485 /****f* silcutil/SilcNetAPI/silc_net_gethostbyaddr_async
489 * void silc_net_gethostbyaddr_async(const char *addr,
490 * SilcSchedule schedule,
491 * SilcNetResolveCallback completion,
496 * Asynchronously resolves the hostname for the IP address indicated
497 * by the `addr'. This function returns immediately, and the
498 * `completion' callback will be called after the resolving is
502 void silc_net_gethostbyaddr_async(const char *addr,
503 SilcSchedule schedule,
504 SilcNetResolveCallback completion,
507 /****f* silcutil/SilcNetAPI/silc_net_check_host_by_sock
511 * SilcBool silc_net_check_host_by_sock(int sock, char **hostname,
516 * Performs lookups for remote name and IP address. This peforms reverse
517 * lookup as well to verify that the IP has FQDN.
520 SilcBool silc_net_check_host_by_sock(int sock, char **hostname, char **ip);
522 /****f* silcutil/SilcNetAPI/silc_net_check_local_by_sock
526 * SilcBool silc_net_check_local_by_sock(int sock, char **hostname,
531 * Performs lookups for local name and IP address. This peforms reverse
532 * lookup as well to verify that the IP has FQDN.
535 SilcBool silc_net_check_local_by_sock(int sock, char **hostname, char **ip);
537 /****f* silcutil/SilcNetAPI/silc_net_get_remote_port
541 * SilcUInt16 silc_net_get_remote_port(int sock);
545 * Return remote port by socket.
548 SilcUInt16 silc_net_get_remote_port(int sock);
550 /****f* silcutil/SilcNetAPI/silc_net_get_local_port
554 * SilcUInt16 silc_net_get_local_port(int sock);
558 * Return local port by socket.
561 SilcUInt16 silc_net_get_local_port(int sock);
563 /****f* silcutil/SilcNetAPI/silc_net_localhost
567 * char *silc_net_localhost(void);
571 * Return name of localhost. This will also attempt to resolve
572 * the real hostname by the local host's IP address. If unsuccessful
573 * the first found hostname is returned. The caller must free
577 char *silc_net_localhost(void);
579 /****f* silcutil/SilcNetAPI/silc_net_localip
583 * char *silc_net_localip(void)
587 * Return IP of localhost. The caller must free the returned IP.
590 char *silc_net_localip(void);
592 /****f* silcutil/SilcNetAPI/silc_net_win32_init
596 * SilcBool silc_net_win32_init(void);
600 * This is WIN32 system specific function and is used to initialize
601 * the network. This must be called by all WIN32 applications. It
602 * is usually called at the application's main() or WinMain() before
603 * calling any other SILC routine. The application must also call
604 * the silc_net_win32_uninit when exiting the application. Returns
605 * FALSE on error. The network will not work if this function returns
610 * This routines is available only on Win32 platform.
613 SilcBool silc_net_win32_init(void);
615 /****f* silcutil/SilcNetAPI/silc_net_win32_uninit
619 * void silc_net_win32_init(void);
623 * This is WIN32 system specific function and is used to uninitialize
624 * the network. This must be called by all WIN32 applications. It
625 * is usually called when the application is exiting. After calling
626 * this function the SILC Net API routines will not work anymore.
630 * This routines is available only on Win32 platform.
633 void silc_net_win32_uninit(void);
635 #include "silcnet_i.h"
637 #endif /* SILCNET_H */