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 it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
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,
63 GNUNET_DISK_directory_create_for_file (fn))
65 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
72 GNUNET_DISK_file_test (fn)) &&
74 GNUNET_DISK_fn_write (fn,
77 GNUNET_DISK_PERM_USER_READ
78 | GNUNET_DISK_PERM_USER_WRITE
79 | GNUNET_DISK_OPEN_CREATE)))
80 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
84 GNUNET_DISK_file_size (fn,
93 data = GNUNET_malloc_large (fsize);
96 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "malloc");
100 ssize = GNUNET_DISK_fn_read (fn,
104 (fsize != (uint64_t) ssize))
106 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
111 return GNUNET_SYSERR;
117 while ((pos < fsize) &&
118 (! isspace ((unsigned char) data[pos])))
121 GNUNET_CRYPTO_eddsa_public_key_from_string (&data[start],
125 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
127 "Syntax error in FRIENDS file at offset %llu, skipping bytes `%.*s'.\n"),
128 (unsigned long long) pos,
146 * Handle for writing a friends file.
148 struct GNUNET_FRIENDS_Writer
151 * Handle to the file.
153 struct GNUNET_DISK_FileHandle *fh;
158 * Start writing a fresh FRIENDS file. Will make a backup of the
161 * @param cfg configuration to use.
162 * @return NULL on error
164 struct GNUNET_FRIENDS_Writer *
165 GNUNET_FRIENDS_write_start (const struct GNUNET_CONFIGURATION_Handle *cfg)
167 struct GNUNET_FRIENDS_Writer *w;
171 GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
173 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
174 "topology", "FRIENDS");
178 GNUNET_DISK_directory_create_for_file (fn))
180 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
181 _ ("Directory for file `%s' does not seem to be writable.\n"),
186 if (GNUNET_OK == GNUNET_DISK_file_test (fn))
187 GNUNET_DISK_file_backup (fn);
188 w = GNUNET_new (struct GNUNET_FRIENDS_Writer);
189 w->fh = GNUNET_DISK_file_open (fn,
190 GNUNET_DISK_OPEN_CREATE
191 | GNUNET_DISK_OPEN_WRITE
192 | GNUNET_DISK_OPEN_FAILIFEXISTS,
193 GNUNET_DISK_PERM_USER_READ);
205 * Finish writing out the friends file.
207 * @param w write handle
208 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
211 GNUNET_FRIENDS_write_stop (struct GNUNET_FRIENDS_Writer *w)
215 ret = GNUNET_DISK_file_close (w->fh);
222 * Add a friend to the friends file.
224 * @param w write handle
225 * @param friend_id friend to add
226 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
229 GNUNET_FRIENDS_write (struct GNUNET_FRIENDS_Writer *w,
230 const struct GNUNET_PeerIdentity *friend_id)
236 ret = GNUNET_CRYPTO_eddsa_public_key_to_string (&friend_id->public_key);
237 GNUNET_asprintf (&buf,
243 GNUNET_DISK_file_write (w->fh,
248 return GNUNET_SYSERR;
255 /* end of friends.c */