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/*
This file is part of GNUnet.
Copyright (C) 2013 Christian Grothoff
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file topology/friends.c
* @brief library to read and write the FRIENDS file
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_friends_lib.h"
/**
* Parse the FRIENDS file.
*
* @param cfg our configuration
* @param cb function to call on each friend found
* @param cb_cls closure for @a cb
* @return #GNUNET_OK on success, #GNUNET_SYSERR on parsing errors
*/
int
GNUNET_FRIENDS_parse (const struct GNUNET_CONFIGURATION_Handle *cfg,
GNUNET_FRIENDS_Callback cb,
void *cb_cls)
{
char *fn;
char *data;
size_t pos;
size_t start;
struct GNUNET_PeerIdentity pid;
uint64_t fsize;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"TOPOLOGY",
"FRIENDS",
&fn))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"topology", "FRIENDS");
return GNUNET_SYSERR;
}
if ( (GNUNET_OK != GNUNET_DISK_file_test (fn)) &&
(GNUNET_OK != GNUNET_DISK_fn_write (fn,
NULL,
0,
GNUNET_DISK_PERM_USER_READ |
GNUNET_DISK_PERM_USER_WRITE |
GNUNET_DISK_OPEN_CREATE)) )
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
"write",
fn);
if ( (GNUNET_OK !=
GNUNET_DISK_file_size (fn,
&fsize,
GNUNET_NO,
GNUNET_YES)) ||
(0 == fsize) )
{
GNUNET_free (fn);
return GNUNET_OK;
}
data = GNUNET_malloc_large (fsize);
if (NULL == data)
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "malloc");
GNUNET_free (fn);
return GNUNET_SYSERR;
}
if (fsize != GNUNET_DISK_fn_read (fn, data, fsize))
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "read", "fn");
GNUNET_free (fn);
GNUNET_free (data);
return GNUNET_SYSERR;
}
start = 0;
pos = 0;
while (pos < fsize)
{
while ((pos < fsize) && (! isspace ((int) data[pos])))
pos++;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_public_key_from_string (&data[start],
pos - start,
&pid.public_key))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Syntax error in FRIENDS file at offset %llu, skipping bytes `%.*s'.\n"),
(unsigned long long) pos,
(int) (pos - start),
&data[start]);
pos++;
start = pos;
continue;
}
pos++;
start = pos;
cb (cb_cls, &pid);
}
GNUNET_free (data);
GNUNET_free (fn);
return GNUNET_OK;
}
/**
* Handle for writing a friends file.
*/
struct GNUNET_FRIENDS_Writer
{
/**
* Handle to the file.
*/
struct GNUNET_DISK_FileHandle *fh;
};
/**
* Start writing a fresh FRIENDS file. Will make a backup of the
* old one.
*
* @param cfg configuration to use.
* @return NULL on error
*/
struct GNUNET_FRIENDS_Writer *
GNUNET_FRIENDS_write_start (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_FRIENDS_Writer *w;
char *fn;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg, "TOPOLOGY", "FRIENDS", &fn))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"topology", "FRIENDS");
return NULL;
}
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (fn))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Directory for file `%s' does not seem to be writable.\n"),
fn);
GNUNET_free (fn);
return NULL;
}
if (GNUNET_OK == GNUNET_DISK_file_test (fn))
GNUNET_DISK_file_backup (fn);
w = GNUNET_new (struct GNUNET_FRIENDS_Writer);
w->fh = GNUNET_DISK_file_open (fn,
GNUNET_DISK_OPEN_CREATE |
GNUNET_DISK_OPEN_WRITE |
GNUNET_DISK_OPEN_FAILIFEXISTS,
GNUNET_DISK_PERM_USER_READ);
GNUNET_free (fn);
if (NULL == w->fh)
{
GNUNET_free (w);
return NULL;
}
return w;
}
/**
* Finish writing out the friends file.
*
* @param w write handle
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
GNUNET_FRIENDS_write_stop (struct GNUNET_FRIENDS_Writer *w)
{
int ret;
ret = GNUNET_DISK_file_close (w->fh);
GNUNET_free (w);
return ret;
}
/**
* Add a friend to the friends file.
*
* @param w write handle
* @param friend_id friend to add
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
GNUNET_FRIENDS_write (struct GNUNET_FRIENDS_Writer *w,
const struct GNUNET_PeerIdentity *friend_id)
{
char *buf;
char *ret;
size_t slen;
ret = GNUNET_CRYPTO_eddsa_public_key_to_string (&friend_id->public_key);
GNUNET_asprintf (&buf,
"%s\n",
ret);
GNUNET_free (ret);
slen = strlen (buf);
if (slen !=
GNUNET_DISK_file_write (w->fh,
buf,
slen))
{
GNUNET_free (buf);
return GNUNET_SYSERR;
}
GNUNET_free (buf);
return GNUNET_OK;
}
/* end of friends.c */
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