2 This file is part of GNUnet.
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3 (C) 2009 Christian Grothoff (and other contributing authors)
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5 GNUnet is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published
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7 by the Free Software Foundation; either version 2, or (at your
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8 option) any later version.
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10 GNUnet is distributed in the hope that it will be useful, but
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with GNUnet; see the file COPYING. If not, write to the
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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18 Boston, MA 02111-1307, USA.
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22 * @file include/gnunet_connection_lib.h
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23 * @brief basic, low-level TCP networking interface
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24 * @author Christian Grothoff
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26 #ifndef GNUNET_CONNECTION_LIB_H
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27 #define GNUNET_CONNECTION_LIB_H
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32 #if 0 /* keep Emacsens' auto-indent happy */
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37 #include "gnunet_network_lib.h"
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38 #include "gnunet_scheduler_lib.h"
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39 #include "gnunet_time_lib.h"
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42 * Timeout we use on TCP connect before trying another
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43 * result from the DNS resolver. 5s.
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45 #define GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
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48 * @brief handle for a network connection
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50 struct GNUNET_CONNECTION_Handle;
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54 * Function to call for access control checks.
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56 * @param cls closure
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57 * @param addr address
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58 * @param addrlen length of address
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59 * @return GNUNET_YES to allow, GNUNET_NO to deny, GNUNET_SYSERR
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60 * for unknown address family (will be denied).
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62 typedef int (*GNUNET_CONNECTION_AccessCheck) (void *cls,
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63 const struct sockaddr * addr,
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68 * Callback function for data received from the network. Note that
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69 * both "available" and "err" would be 0 if the read simply timed out.
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71 * @param cls closure
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72 * @param buf pointer to received data
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73 * @param available number of bytes availabe in "buf",
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74 * possibly 0 (on errors)
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75 * @param addr address of the sender
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76 * @param addrlen size of addr
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77 * @param errCode value of errno (on errors receiving)
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79 typedef void (*GNUNET_CONNECTION_Receiver) (void *cls,
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82 const struct sockaddr * addr,
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83 socklen_t addrlen, int errCode);
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87 * Create a socket handle by boxing an existing OS socket. The OS
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88 * socket should henceforth be no longer used directly.
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89 * GNUNET_socket_destroy will close it.
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91 * @param sched scheduler to use
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92 * @param osSocket existing socket to box
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93 * @param maxbuf maximum write buffer size for the socket (use
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94 * 0 for sockets that need no write buffers, such as listen sockets)
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95 * @return the boxed socket handle
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97 struct GNUNET_CONNECTION_Handle
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98 *GNUNET_CONNECTION_create_from_existing (struct
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99 GNUNET_SCHEDULER_Handle
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102 GNUNET_NETWORK_Handle
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103 *osSocket, size_t maxbuf);
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107 * Create a socket handle by accepting on a listen socket. This
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108 * function may block if the listen socket has no connection ready.
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110 * @param sched scheduler to use
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111 * @param access function to use to check if access is allowed
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112 * @param access_cls closure for access
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113 * @param lsock listen socket
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114 * @param maxbuf maximum write buffer size for the socket (use
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115 * 0 for sockets that need no write buffers, such as listen sockets)
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116 * @return the socket handle, NULL on error (for example, access refused)
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118 struct GNUNET_CONNECTION_Handle
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119 *GNUNET_CONNECTION_create_from_accept (struct
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120 GNUNET_SCHEDULER_Handle
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122 GNUNET_CONNECTION_AccessCheck
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123 access, void *access_cls,
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125 GNUNET_NETWORK_Handle
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126 *lsock, size_t maxbuf);
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130 * Create a socket handle by (asynchronously) connecting to a host.
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131 * This function returns immediately, even if the connection has not
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132 * yet been established. This function only creates TCP connections.
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134 * @param sched scheduler to use
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135 * @param hostname name of the host to connect to
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136 * @param port port to connect to
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137 * @param maxbuf maximum write buffer size for the socket (use
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138 * 0 for sockets that need no write buffers, such as listen sockets)
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139 * @return the socket handle
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141 struct GNUNET_CONNECTION_Handle
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142 *GNUNET_CONNECTION_create_from_connect (struct
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143 GNUNET_SCHEDULER_Handle
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145 const char *hostname,
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152 * Create a socket handle by (asynchronously) connecting to a host.
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153 * This function returns immediately, even if the connection has not
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154 * yet been established. This function only creates TCP connections.
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156 * @param sched scheduler to use
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157 * @param af_family address family to use
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158 * @param serv_addr server address
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159 * @param addrlen length of server address
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160 * @param maxbuf maximum write buffer size for the socket (use
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161 * 0 for sockets that need no write buffers, such as listen sockets)
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162 * @return the socket handle
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164 struct GNUNET_CONNECTION_Handle
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165 *GNUNET_CONNECTION_create_from_sockaddr (struct
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166 GNUNET_SCHEDULER_Handle
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167 *sched, int af_family,
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168 const struct sockaddr
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174 * Check if socket is valid (no fatal errors have happened so far).
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175 * Note that a socket that is still trying to connect is considered
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178 * @param sock socket to check
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179 * @return GNUNET_YES if valid, GNUNET_NO otherwise
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181 int GNUNET_CONNECTION_check (struct GNUNET_CONNECTION_Handle
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186 * Obtain the network address of the other party.
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188 * @param sock the client to get the address for
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189 * @param addr where to store the address
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190 * @param addrlen where to store the length of the address
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191 * @return GNUNET_OK on success
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193 int GNUNET_CONNECTION_get_address (struct
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194 GNUNET_CONNECTION_Handle
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195 *sock, void **addr,
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199 * Close the socket and free associated resources. Pending
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200 * transmissions are simply dropped. A pending receive call will be
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201 * called with an error code of "EPIPE".
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203 * @param sock socket to destroy
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205 void GNUNET_CONNECTION_destroy (struct GNUNET_CONNECTION_Handle
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210 * Receive data from the given socket. Note that this function will
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211 * call "receiver" asynchronously using the scheduler. It will
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212 * "immediately" return. Note that there MUST only be one active
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213 * receive call per socket at any given point in time (so do not
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214 * call receive again until the receiver callback has been invoked).
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216 * @param sock socket handle
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217 * @param max maximum number of bytes to read
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218 * @param timeout maximum amount of time to wait
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219 * @param receiver function to call with received data
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220 * @param receiver_cls closure for receiver
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221 * @return scheduler task ID used for receiving, GNUNET_SCHEDULER_NO_TASK on error
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223 GNUNET_SCHEDULER_TaskIdentifier
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224 GNUNET_CONNECTION_receive (struct GNUNET_CONNECTION_Handle
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226 struct GNUNET_TIME_Relative timeout,
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227 GNUNET_CONNECTION_Receiver receiver,
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228 void *receiver_cls);
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232 * Cancel receive job on the given socket. Note that the
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233 * receiver callback must not have been called yet in order
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234 * for the cancellation to be valid.
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236 * @param sock socket handle
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237 * @param task task identifier returned from the receive call
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238 * @return closure of the original receiver callback
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240 void *GNUNET_CONNECTION_receive_cancel (struct
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241 GNUNET_CONNECTION_Handle
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243 GNUNET_SCHEDULER_TaskIdentifier
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248 * Function called to notify a client about the socket
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249 * begin ready to queue more data. "buf" will be
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250 * NULL and "size" zero if the socket was closed for
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251 * writing in the meantime.
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253 * @param cls closure
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254 * @param size number of bytes available in buf
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255 * @param buf where the callee should write the message
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256 * @return number of bytes written to buf
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258 typedef size_t (*GNUNET_CONNECTION_TransmitReadyNotify) (void *cls,
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259 size_t size, void *buf);
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263 * Opaque handle that can be used to cancel
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264 * a transmit-ready notification.
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266 struct GNUNET_CONNECTION_TransmitHandle;
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269 * Ask the socket to call us once the specified number of bytes
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270 * are free in the transmission buffer. May call the notify
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271 * method immediately if enough space is available. Note that
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272 * this function will abort if "size" is greater than
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273 * "maxbuf" (as specified when the socket handle was created).
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275 * Note that "notify" will be called either when enough
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276 * buffer space is available OR when the socket is destroyed.
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277 * The size parameter given to notify is guaranteed to be
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278 * larger or equal to size if the buffer is ready, or zero
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279 * if the socket was destroyed (or at least closed for
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280 * writing). Finally, any time before 'notify' is called, a
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281 * client may call "notify_transmit_ready_cancel" to cancel
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282 * the transmission request.
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284 * Only one transmission request can be scheduled at the same
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285 * time. Notify will be run with the same scheduler priority
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286 * as that of the caller.
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288 * @param sock socket
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289 * @param size number of bytes to send
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290 * @param timeout after how long should we give up (and call
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291 * notify with buf NULL and size 0)?
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292 * @param notify function to call when buffer space is available
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293 * @param notify_cls closure for notify
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294 * @return non-NULL if the notify callback was queued,
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295 * NULL if we are already going to notify someone else (busy)
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297 struct GNUNET_CONNECTION_TransmitHandle
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298 *GNUNET_CONNECTION_notify_transmit_ready (struct
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299 GNUNET_CONNECTION_Handle
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300 *sock, size_t size,
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302 GNUNET_TIME_Relative
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304 GNUNET_CONNECTION_TransmitReadyNotify
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305 notify, void *notify_cls);
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309 * Cancel the specified transmission-ready
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312 * @param h handle for notification to cancel
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315 GNUNET_CONNECTION_notify_transmit_ready_cancel (struct
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316 GNUNET_CONNECTION_TransmitHandle
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320 #if 0 /* keep Emacsens' auto-indent happy */
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328 /* ifndef GNUNET_CONNECTION_LIB_H */
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330 /* end of gnunet_connection_lib.h */
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