2 This file is part of GNUnet.
3 (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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, 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;
51 GNUNET_CONFIGURATION_get_value_filename (cfg,
56 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
57 "topology", "FRIENDS");
60 if ( (GNUNET_OK != GNUNET_DISK_file_test (fn)) &&
61 (GNUNET_OK != GNUNET_DISK_fn_write (fn, NULL, 0,
62 GNUNET_DISK_PERM_USER_READ |
63 GNUNET_DISK_PERM_USER_WRITE)) )
64 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
66 GNUNET_DISK_file_size (fn,
68 GNUNET_NO, GNUNET_YES)) ||
74 data = GNUNET_malloc_large (fsize);
77 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "malloc");
81 if (fsize != GNUNET_DISK_fn_read (fn, data, fsize))
83 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "read", "fn");
92 while ((pos < fsize) && (! isspace ((int) data[pos])))
95 GNUNET_CRYPTO_eddsa_public_key_from_string (&data[start],
99 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
100 _("Syntax error in FRIENDS file at offset %llu, skipping bytes `%.*s'.\n"),
101 (unsigned long long) pos,
119 * Handle for writing a friends file.
121 struct GNUNET_FRIENDS_Writer
124 * Handle to the file.
126 struct GNUNET_DISK_FileHandle *fh;
131 * Start writing a fresh FRIENDS file. Will make a backup of the
134 * @param cfg configuration to use.
135 * @return NULL on error
137 struct GNUNET_FRIENDS_Writer *
138 GNUNET_FRIENDS_write_start (const struct GNUNET_CONFIGURATION_Handle *cfg)
140 struct GNUNET_FRIENDS_Writer *w;
144 GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
146 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
147 "topology", "FRIENDS");
151 GNUNET_DISK_directory_create_for_file (fn))
153 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
154 _("Directory for file `%s' does not seem to be writable.\n"),
158 if (GNUNET_OK == GNUNET_DISK_file_test (fn))
159 GNUNET_DISK_file_backup (fn);
160 w = GNUNET_new (struct GNUNET_FRIENDS_Writer);
161 w->fh = GNUNET_DISK_file_open (fn,
162 GNUNET_DISK_OPEN_CREATE |
163 GNUNET_DISK_OPEN_WRITE |
164 GNUNET_DISK_OPEN_FAILIFEXISTS,
165 GNUNET_DISK_PERM_USER_READ);
177 * Finish writing out the friends file.
179 * @param w write handle
180 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
183 GNUNET_FRIENDS_write_stop (struct GNUNET_FRIENDS_Writer *w)
187 ret = GNUNET_DISK_file_close (w->fh);
194 * Add a friend to the friends file.
196 * @param w write handle
197 * @param friend_id friend to add
198 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
201 GNUNET_FRIENDS_write (struct GNUNET_FRIENDS_Writer *w,
202 const struct GNUNET_PeerIdentity *friend_id)
208 ret = GNUNET_CRYPTO_eddsa_public_key_to_string (&friend_id->public_key);
209 GNUNET_asprintf (&buf,
215 GNUNET_DISK_file_write (w->fh,
220 return GNUNET_SYSERR;
227 /* end of friends.c */