2 This file is part of GNUnet.
3 (C) 2009-2014 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 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file transport/transport_api_address_to_string.c
22 * @author Christian Grothoff
23 * @brief enable clients to convert addresses to human readable strings
26 #include "gnunet_util_lib.h"
27 #include "gnunet_arm_service.h"
28 #include "gnunet_hello_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_transport_service.h"
31 #include "transport.h"
34 * Context for the address lookup.
36 struct GNUNET_TRANSPORT_AddressToStringContext
39 * Function to call with the human-readable address.
41 GNUNET_TRANSPORT_AddressToStringCallback cb;
49 * Connection to the service.
51 struct GNUNET_CLIENT_Connection *client;
57 * Function called with responses from the service.
59 * @param cls our `struct GNUNET_TRANSPORT_AddressToStringContext *`
60 * @param msg NULL on timeout or error, otherwise presumably a
61 * message with the human-readable address
64 address_response_processor (void *cls,
65 const struct GNUNET_MessageHeader *msg)
67 struct GNUNET_TRANSPORT_AddressToStringContext *alucb = cls;
68 const struct AddressToStringResultMessage *atsm;
76 alucb->cb (alucb->cb_cls,
79 GNUNET_TRANSPORT_address_to_string_cancel (alucb);
82 GNUNET_break (ntohs (msg->type) ==
83 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
85 size = ntohs (msg->size);
86 if (size < sizeof (struct AddressToStringResultMessage))
89 alucb->cb (alucb->cb_cls,
92 GNUNET_TRANSPORT_address_to_string_cancel (alucb);
95 atsm = (const struct AddressToStringResultMessage *) msg;
96 result = (int) ntohl (atsm->res);
97 addr_len = ntohl (atsm->addr_len);
98 if (GNUNET_SYSERR == result)
100 /* expect more replies; as this is not the last
101 call, we must pass the empty string for the address */
102 alucb->cb (alucb->cb_cls,
105 GNUNET_CLIENT_receive (alucb->client,
106 &address_response_processor,
108 GNUNET_TIME_UNIT_FOREVER_REL);
111 if (size == (sizeof (struct AddressToStringResultMessage)))
113 if (GNUNET_OK != result)
116 alucb->cb (alucb->cb_cls,
119 GNUNET_CLIENT_disconnect (alucb->client);
123 /* we are done (successfully, without communication errors) */
124 alucb->cb (alucb->cb_cls,
127 GNUNET_TRANSPORT_address_to_string_cancel (alucb);
130 address = (const char *) &atsm[1];
131 if ( (addr_len > (size - (sizeof (struct AddressToStringResultMessage)))) ||
132 (address[addr_len -1] != '\0') )
136 alucb->cb (alucb->cb_cls,
139 GNUNET_TRANSPORT_address_to_string_cancel (alucb);
142 /* expect more replies */
143 GNUNET_CLIENT_receive (alucb->client,
144 &address_response_processor,
146 GNUNET_TIME_UNIT_FOREVER_REL);
147 /* return normal reply to caller */
148 alucb->cb (alucb->cb_cls,
155 * Convert a binary address into a human readable address.
157 * @param cfg configuration to use
158 * @param address address to convert (binary format)
159 * @param numeric should (IP) addresses be displayed in numeric form
160 * (otherwise do reverse DNS lookup)
161 * @param timeout how long is the lookup allowed to take at most
162 * @param aluc function to call with the results
163 * @param aluc_cls closure for @a aluc
164 * @return handle to cancel the operation, NULL on error
166 struct GNUNET_TRANSPORT_AddressToStringContext *
167 GNUNET_TRANSPORT_address_to_string (const struct GNUNET_CONFIGURATION_Handle *cfg,
168 const struct GNUNET_HELLO_Address *address,
170 struct GNUNET_TIME_Relative timeout,
171 GNUNET_TRANSPORT_AddressToStringCallback aluc,
177 struct AddressLookupMessage *msg;
178 struct GNUNET_TRANSPORT_AddressToStringContext *alc;
179 struct GNUNET_CLIENT_Connection *client;
182 GNUNET_assert (NULL != address);
183 alen = address->address_length;
184 slen = strlen (address->transport_name) + 1;
185 len = sizeof (struct AddressLookupMessage) + alen + slen;
186 if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
191 client = GNUNET_CLIENT_connect ("transport", cfg);
194 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
195 "Client %p tries to resolve for peer `%s'address len %u \n",
197 GNUNET_i2s (&address->peer),
198 address->address_length);
200 msg = GNUNET_malloc (len);
201 msg->header.size = htons (len);
202 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING);
203 msg->numeric_only = htons ((int16_t) numeric);
204 msg->addrlen = htons ((uint16_t) alen);
205 msg->timeout = GNUNET_TIME_relative_hton (timeout);
206 addrbuf = (char *) &msg[1];
210 memcpy (&addrbuf[alen],
211 address->transport_name,
213 alc = GNUNET_new (struct GNUNET_TRANSPORT_AddressToStringContext);
215 alc->cb_cls = aluc_cls;
216 alc->client = client;
217 GNUNET_assert (GNUNET_OK ==
218 GNUNET_CLIENT_transmit_and_get_response (client,
220 GNUNET_TIME_UNIT_FOREVER_REL,
222 &address_response_processor,
230 * Cancel request for address conversion.
232 * @param pic the context handle
235 GNUNET_TRANSPORT_address_to_string_cancel (struct GNUNET_TRANSPORT_AddressToStringContext *pic)
237 GNUNET_CLIENT_disconnect (pic->client);
243 /* end of transport_api_address_to_string.c */