2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file include/gnunet_network_lib.h
23 * @brief basic low-level networking interface
27 #ifndef GNUNET_NETWORK_LIB_H
28 #define GNUNET_NETWORK_LIB_H
33 #if 0 /* keep Emacsens' auto-indent happy */
40 * @brief handle to a socket
42 struct GNUNET_NETWORK_Handle;
46 * @brief collection of IO descriptors
48 struct GNUNET_NETWORK_FDSet
52 * Maximum number of any socket socket descriptor in the set (plus one)
57 * Bitset with the descriptors.
63 * Linked list of handles
65 struct GNUNET_CONTAINER_SList *handles;
72 #include "gnunet_disk_lib.h"
73 #include "gnunet_time_lib.h"
77 * Accept a new connection on a socket. Configure it for non-blocking
78 * IO and mark it as non-inheritable to child processes (set the
79 * close-on-exec flag).
81 * @param desc bound socket
82 * @param address address of the connecting peer, may be NULL
83 * @param address_len length of address
84 * @return client socket
86 struct GNUNET_NETWORK_Handle *GNUNET_NETWORK_socket_accept (const struct
96 * Box a native socket (and check that it is a socket).
98 * @param fd socket to box
99 * @return NULL on error (including not supported on target platform)
101 struct GNUNET_NETWORK_Handle *
102 GNUNET_NETWORK_socket_box_native (int fd);
106 * Bind to a connected socket
108 * @param desc socket to bind
109 * @param address address to be bound
110 * @param address_len length of address
111 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
113 int GNUNET_NETWORK_socket_bind (struct GNUNET_NETWORK_Handle *desc,
114 const struct sockaddr *address,
115 socklen_t address_len);
120 * @param desc socket to close
121 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
123 int GNUNET_NETWORK_socket_close (struct GNUNET_NETWORK_Handle *desc);
129 * @param desc socket to connect
130 * @param address peer address
131 * @param address_len of address
132 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
134 int GNUNET_NETWORK_socket_connect (const struct GNUNET_NETWORK_Handle *desc,
135 const struct sockaddr *address,
136 socklen_t address_len);
142 * @param desc socket to inspect
143 * @param level protocol level of the option
144 * @param optname identifier of the option
145 * @param optval options
146 * @param optlen length of optval
147 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
149 int GNUNET_NETWORK_socket_getsockopt (const struct GNUNET_NETWORK_Handle
150 *desc, int level, int optname,
151 void *optval, socklen_t * optlen);
157 * @param desc socket to start listening on
158 * @param backlog length of the listen queue
159 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
161 int GNUNET_NETWORK_socket_listen (const struct GNUNET_NETWORK_Handle *desc,
166 * How much data is available to be read on this descriptor?
170 GNUNET_NETWORK_socket_recvfrom_amount (const struct GNUNET_NETWORK_Handle
175 * Read data from a connected socket (always non-blocking).
177 * @param buffer buffer
178 * @param length length of buffer
179 * @param src_addr either the source to recv from, or all zeroes
180 * to be filled in by recvfrom
181 * @param addrlen length of the addr
184 GNUNET_NETWORK_socket_recvfrom (const struct GNUNET_NETWORK_Handle *desc,
185 void *buffer, size_t length,
186 struct sockaddr *src_addr,
187 socklen_t * addrlen);
191 * Read data from a connected socket (always non-blocking).
194 * @param buffer buffer
195 * @param length length of buffer
196 * @return number of bytes read
198 ssize_t GNUNET_NETWORK_socket_recv (const struct GNUNET_NETWORK_Handle *desc,
199 void *buffer, size_t length);
203 * Check if sockets meet certain conditions
204 * @param rfds set of sockets to be checked for readability
205 * @param wfds set of sockets to be checked for writability
206 * @param efds set of sockets to be checked for exceptions
207 * @param timeout relative value when to return
208 * @return number of selected sockets, GNUNET_SYSERR on error
210 int GNUNET_NETWORK_socket_select (struct GNUNET_NETWORK_FDSet *rfds,
211 struct GNUNET_NETWORK_FDSet *wfds,
212 struct GNUNET_NETWORK_FDSet *efds,
213 struct GNUNET_TIME_Relative timeout);
217 * Send data (always non-blocking).
220 * @param buffer data to send
221 * @param length size of the buffer
222 * @return number of bytes sent, GNUNET_SYSERR on error
224 ssize_t GNUNET_NETWORK_socket_send (const struct GNUNET_NETWORK_Handle *desc,
225 const void *buffer, size_t length);
229 * Send data to a particular destination (always non-blocking).
230 * This function only works for UDP sockets.
233 * @param message data to send
234 * @param length size of the data
235 * @param dest_addr destination address
236 * @param dest_len length of address
237 * @return number of bytes sent, GNUNET_SYSERR on error
239 ssize_t GNUNET_NETWORK_socket_sendto (const struct GNUNET_NETWORK_Handle
240 *desc, const void *message,
242 const struct sockaddr *dest_addr,
250 * @param level protocol level of the option
251 * @param option_name option identifier
252 * @param option_value value to set
253 * @param option_len size of option_value
254 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
256 int GNUNET_NETWORK_socket_setsockopt (struct GNUNET_NETWORK_Handle *fd,
257 int level, int option_name,
258 const void *option_value,
259 socklen_t option_len);
263 * Shut down socket operations
266 * @param how type of shutdown
267 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
269 int GNUNET_NETWORK_socket_shutdown (struct GNUNET_NETWORK_Handle *desc,
274 * Disable the "CORK" feature for communication with the given socket,
275 * forcing the OS to immediately flush the buffer on transmission
276 * instead of potentially buffering multiple messages. Essentially
277 * reduces the OS send buffers to zero.
280 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
282 int GNUNET_NETWORK_socket_disable_corking (struct GNUNET_NETWORK_Handle *desc);
286 * Create a new socket. Configure it for non-blocking IO and
287 * mark it as non-inheritable to child processes (set the
288 * close-on-exec flag).
290 * @param domain domain of the socket
291 * @param type socket type
292 * @param protocol network protocol
293 * @return new socket, NULL on error
295 struct GNUNET_NETWORK_Handle *GNUNET_NETWORK_socket_create (int domain,
301 * Reset FD set (clears all file descriptors).
303 * @param fds fd set to clear
305 void GNUNET_NETWORK_fdset_zero (struct GNUNET_NETWORK_FDSet *fds);
309 * Add a socket to the FD set
311 * @param desc socket to add
313 void GNUNET_NETWORK_fdset_set (struct GNUNET_NETWORK_FDSet *fds,
314 const struct GNUNET_NETWORK_Handle *desc);
318 /* TODO: maybe #ifdef WINDOWS? -ndurner */
320 * Add a W32 file handle to the fd set
322 * @param h the file handle to add
325 GNUNET_NETWORK_fdset_handle_set_native_w32_handle (struct GNUNET_NETWORK_FDSet *fds,
331 * Check whether a socket is part of the fd set
334 * @return GNUNET_YES if the socket is in the set
336 int GNUNET_NETWORK_fdset_isset (const struct GNUNET_NETWORK_FDSet *fds,
337 const struct GNUNET_NETWORK_Handle *desc);
341 * Add one fd set to another
342 * @param dst the fd set to add to
343 * @param src the fd set to add from
345 void GNUNET_NETWORK_fdset_add (struct GNUNET_NETWORK_FDSet *dst,
346 const struct GNUNET_NETWORK_FDSet *src);
350 * Copy one fd set to another
351 * @param to destination
354 void GNUNET_NETWORK_fdset_copy (struct GNUNET_NETWORK_FDSet *to,
355 const struct GNUNET_NETWORK_FDSet *from);
359 * Return file descriptor for this network handle
361 * @param desc wrapper to process
362 * @return POSIX file descriptor
364 int GNUNET_NETWORK_get_fd (struct GNUNET_NETWORK_Handle *desc);
368 * Copy a native fd set
369 * @param to destination
370 * @param from native source set
371 * @param nfds the biggest socket number in from + 1
373 void GNUNET_NETWORK_fdset_copy_native (struct GNUNET_NETWORK_FDSet *to,
374 const fd_set * from, int nfds);
378 * Set a native fd in a set
380 * @param to destination
381 * @param nfd native FD to set
383 void GNUNET_NETWORK_fdset_set_native (struct GNUNET_NETWORK_FDSet *to,
388 * Test native fd in a set
390 * @param to set to test, NULL for empty set
391 * @param nfd native FD to test, -1 for none
392 * @return GNUNET_YES if to contains nfd
395 GNUNET_NETWORK_fdset_test_native (const struct GNUNET_NETWORK_FDSet *to,
400 * Add a file handle to the fd set
402 * @param h the file handle to add
404 void GNUNET_NETWORK_fdset_handle_set (struct GNUNET_NETWORK_FDSet *fds,
405 const struct GNUNET_DISK_FileHandle *h);
409 * Check if a file handle is part of an fd set
411 * @param h file handle
412 * @return GNUNET_YES if the file handle is part of the set
414 int GNUNET_NETWORK_fdset_handle_isset (const struct GNUNET_NETWORK_FDSet *fds,
415 const struct GNUNET_DISK_FileHandle
420 * Checks if two fd sets overlap
421 * @param fds1 first fd set
422 * @param fds2 second fd set
423 * @return GNUNET_YES if they do overlap, GNUNET_NO otherwise
425 int GNUNET_NETWORK_fdset_overlap (const struct GNUNET_NETWORK_FDSet *fds1,
426 const struct GNUNET_NETWORK_FDSet *fds2);
431 * @return a new fd set
433 struct GNUNET_NETWORK_FDSet *GNUNET_NETWORK_fdset_create (void);
437 * Releases the associated memory of an fd set
440 void GNUNET_NETWORK_fdset_destroy (struct GNUNET_NETWORK_FDSet *fds);
443 #if 0 /* keep Emacsens' auto-indent happy */
450 #endif /* GNUNET_NETWORK_LIB_H */