2 This file is part of GNUnet.
3 Copyright (C) 2013 Christian Grothoff
5 GNUnet is free software; you can redistribute it and/or modify
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.
10 GNUnet is distributed in the hope that it will be useful, but
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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file topology/friends.c
23 * @brief library to read and write the FRIENDS file
24 * @author Christian Grothoff
27 #include "gnunet_friends_lib.h"
31 * Parse the FRIENDS file.
33 * @param cfg our configuration
34 * @param cb function to call on each friend found
35 * @param cb_cls closure for @a cb
36 * @return #GNUNET_OK on success, #GNUNET_SYSERR on parsing errors
39 GNUNET_FRIENDS_parse (const struct GNUNET_CONFIGURATION_Handle *cfg,
40 GNUNET_FRIENDS_Callback cb,
47 struct GNUNET_PeerIdentity pid;
52 GNUNET_CONFIGURATION_get_value_filename (cfg,
57 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
58 "topology", "FRIENDS");
62 GNUNET_DISK_directory_create_for_file (fn))
64 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
71 GNUNET_DISK_file_test (fn)) &&
73 GNUNET_DISK_fn_write (fn,
76 GNUNET_DISK_PERM_USER_READ |
77 GNUNET_DISK_PERM_USER_WRITE |
78 GNUNET_DISK_OPEN_CREATE)) )
79 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
83 GNUNET_DISK_file_size (fn,
92 data = GNUNET_malloc_large (fsize);
95 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "malloc");
99 ssize = GNUNET_DISK_fn_read (fn,
103 (fsize != (uint64_t) ssize) )
105 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
110 return GNUNET_SYSERR;
116 while ( (pos < fsize) &&
117 (! isspace ((unsigned char) data[pos])) )
120 GNUNET_CRYPTO_eddsa_public_key_from_string (&data[start],
124 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
125 _("Syntax error in FRIENDS file at offset %llu, skipping bytes `%.*s'.\n"),
126 (unsigned long long) pos,
144 * Handle for writing a friends file.
146 struct GNUNET_FRIENDS_Writer
149 * Handle to the file.
151 struct GNUNET_DISK_FileHandle *fh;
156 * Start writing a fresh FRIENDS file. Will make a backup of the
159 * @param cfg configuration to use.
160 * @return NULL on error
162 struct GNUNET_FRIENDS_Writer *
163 GNUNET_FRIENDS_write_start (const struct GNUNET_CONFIGURATION_Handle *cfg)
165 struct GNUNET_FRIENDS_Writer *w;
169 GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
171 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
172 "topology", "FRIENDS");
176 GNUNET_DISK_directory_create_for_file (fn))
178 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
179 _("Directory for file `%s' does not seem to be writable.\n"),
184 if (GNUNET_OK == GNUNET_DISK_file_test (fn))
185 GNUNET_DISK_file_backup (fn);
186 w = GNUNET_new (struct GNUNET_FRIENDS_Writer);
187 w->fh = GNUNET_DISK_file_open (fn,
188 GNUNET_DISK_OPEN_CREATE |
189 GNUNET_DISK_OPEN_WRITE |
190 GNUNET_DISK_OPEN_FAILIFEXISTS,
191 GNUNET_DISK_PERM_USER_READ);
203 * Finish writing out the friends file.
205 * @param w write handle
206 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
209 GNUNET_FRIENDS_write_stop (struct GNUNET_FRIENDS_Writer *w)
213 ret = GNUNET_DISK_file_close (w->fh);
220 * Add a friend to the friends file.
222 * @param w write handle
223 * @param friend_id friend to add
224 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
227 GNUNET_FRIENDS_write (struct GNUNET_FRIENDS_Writer *w,
228 const struct GNUNET_PeerIdentity *friend_id)
234 ret = GNUNET_CRYPTO_eddsa_public_key_to_string (&friend_id->public_key);
235 GNUNET_asprintf (&buf,
241 GNUNET_DISK_file_write (w->fh,
246 return GNUNET_SYSERR;
253 /* end of friends.c */