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/*
* Copyright (c) 2002, Vidar Madsen
*
*----------------------------------------------------------------------
* This file is part of gtk-gnutella.
*
* gtk-gnutella 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 2 of the License, or
* (at your option) any later version.
*
* gtk-gnutella 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 gtk-gnutella; if not, write to the Free Software
* Foundation, Inc.:
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*----------------------------------------------------------------------
*/
/**
* @ingroup core
* @file
*
* Needs brief description here.
*
* Functions for keeping a whitelist of nodes we always allow in,
* and whom we try to keep a connection to.
*
* @author Vidar Madsen
* @date 2002
*/
#include "common.h"
RCSID("$Id: whitelist.c,v 1.6 2005/06/29 14:24:25 daichik Exp $");
#include "whitelist.h"
#include "settings.h"
#include "nodes.h"
#include "lib/file.h"
#include "lib/glib-missing.h"
#include "lib/override.h" /* Must be the last header included */
static GSList *sl_whitelist = NULL;
static const gchar whitelist_file[] = "whitelist";
static time_t whitelist_mtime, whitelist_checked;
static gchar *whitelist_path = NULL;
/**
* whitelist_retrieve
*
* Loads the whitelist into memory.
*/
static void whitelist_retrieve(void)
{
gchar line[1024];
gchar *p, *sport, *snetmask;
guint32 ip, port, netmask;
struct whitelist *n;
FILE *f;
struct stat st;
int linenum = 0;
file_path_t fp[1];
file_path_set(fp, settings_config_dir(), whitelist_file);
f = file_config_open_read_norename("Host Whitelist", fp, G_N_ELEMENTS(fp));
if (!f)
return;
if (fstat(fileno(f), &st)) {
g_warning("whitelist_retrieve: fstat() failed: %s", g_strerror(errno));
fclose(f);
return;
}
whitelist_checked = time(NULL);
whitelist_mtime = st.st_mtime;
while (fgets(line, sizeof(line), f)) {
linenum++;
if (*line == '#') continue;
/* Remove trailing spaces so that lines that contain spaces only
* are ignored and cause no warnings. */
p = strchr(line, '\0');
while (--p >= line) {
if (!is_ascii_space((guchar) *p))
break;
*p = '\0';
}
if ('\0' == *line)
continue;
sport = snetmask = NULL;
if ((p = strchr(line, '/')) != NULL) {
*p = '\0';
snetmask = ++p;
}
if ((p = strchr(line, ':')) != NULL) {
*p = '\0';
sport = ++p;
}
ip = host_to_ip(line);
if (!ip) {
g_warning("whitelist_retrieve(): "
"Line %d: Invalid IP \"%s\"", linenum, line);
continue;
}
if (sport)
port = atol(sport);
else
port = 0;
netmask = 0xffffffffU; /* Default mask */
if (snetmask) {
if (strchr(snetmask, '.')) {
netmask = gchar_to_ip(snetmask);
if (!netmask) {
netmask = 0xffffffff;
g_warning("whitelist_retrieve(): "
"Line %d: Invalid netmask \"%s\", "
"using 255.255.255.255 instead.", linenum, snetmask);
}
} else {
gint error;
gulong v;
v = gm_atoul(snetmask, NULL, &error);
if (!error && v > 0 && v <= 32) {
netmask = ~(0xffffffffU >> v);
} else {
g_warning("whitelist_retrieve(): "
"Line %d: Invalid netmask \"%s\", "
"using /32 instead.", linenum, snetmask);
}
}
}
n = g_malloc0(sizeof(*n));
n->ip = ip;
n->port = port;
n->netmask = netmask;
sl_whitelist = g_slist_prepend(sl_whitelist, n);
}
sl_whitelist = g_slist_reverse(sl_whitelist);
fclose(f);
}
/**
* whitelist_connect
*
* Attempts to connect to the nodes we have whitelisted.
* Only entries with a specified port will be tried.
*
* @returns the number of new nodes that are connected to.
*/
guint whitelist_connect(void)
{
GSList *sl;
struct whitelist *n;
time_t now = time(NULL);
guint num = 0;
for (sl = sl_whitelist; sl; sl = g_slist_next(sl)) {
n = sl->data;
if (!n->port)
continue;
if (node_is_connected(n->ip, n->port, TRUE))
continue;
if (delta_time(now, n->last_try) > WHITELIST_RETRY_DELAY) {
n->last_try = now;
node_add(n->ip, n->port);
num++;
}
}
return num;
}
/**
* whitelist_init
*
* Called on startup. Loads the whitelist into memory.
*/
void whitelist_init(void)
{
whitelist_path = make_pathname(settings_config_dir(), whitelist_file);
whitelist_retrieve();
}
/**
* whitelist_close
*
* Frees all entries in the whitelist.
*/
void whitelist_close(void)
{
GSList *sl;
for (sl = sl_whitelist; sl; sl = g_slist_next(sl))
g_free(sl->data);
g_slist_free(sl_whitelist);
sl_whitelist = NULL;
G_FREE_NULL(whitelist_path);
}
/**
* whitelist_reload
*
* Reloads the whitelist.
*/
void whitelist_reload(void)
{
whitelist_close();
whitelist_retrieve();
}
/**
* whitelist_check
*
* Check the given IP agains the entries in the whitelist.
* @returns TRUE if found, and FALSE if not.
*
* Also, it will peridically check the whitelist file for
* updates, and reload it if it has changed.
*/
gboolean whitelist_check(guint32 ip)
{
struct whitelist *n;
time_t now = time(NULL);
GSList *sl;
/* Check if the file has changed on disk, and reload it if necessary. */
if (delta_time(now, whitelist_checked) > WHITELIST_CHECK_INTERVAL) {
struct stat st;
whitelist_checked = now;
if (NULL != whitelist_path && 0 == stat(whitelist_path, &st)) {
if (st.st_mtime != whitelist_mtime) {
g_warning("whitelist_check(): "
"Whitelist changed on disk. Reloading.");
whitelist_reload();
}
}
}
for (sl = sl_whitelist; sl; sl = g_slist_next(sl)) {
n = sl->data;
if ((ip & n->netmask) == (n->ip & n->netmask))
return TRUE;
}
return FALSE;
}
/* vi: set ts=4: */
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