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version 1.1

/*************************************************************************
 * (C) 2010 AITNET - Sofia/Bulgaria - <office@aitbg.com>
 *  by Michael Pounov <misho@aitbg.com>
 *
 * $Author: misho $
 * $Id: dwds.c,v 1.3 2012/07/22 22:46:47 misho Exp $
 *
 *************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
#include "dwds.h"


cfg_root_t cfg;
int Verbose, Kill, nif;
char **ifs, szConfig[MAXPATHLEN] = DWDS_CONFIG;
extern char compiled[], compiledby[], compilehost[];


static void
Usage()
{
	printf(	"-= dWDS =- WiFi dynamic WDS service managment for VAP\n"
		"=== %s === %s@%s ===\n\n"
		"  Syntax: dwds [options] <interface|any> [interface [ath0, ...]]\n"
		"\n"
		"\t-v\t\tVerbose ...\n"
		"\t-f\t\tForeground, not demonize process ...\n"
		"\t-c <config>\tConfig file [default=/etc/dwds.conf]\n"
		"\n", compiled, compiledby, compilehost);
}

static void
sigHandler(int sig)
{
	int stat;
	ait_val_t name;
	const char *v;

	switch (sig) {
		case SIGHUP:
			cfgUnloadConfig(&cfg);
			if (cfgLoadConfig(szConfig, &cfg)) {
				printf("Error:: can`t load config %s ...\n", szConfig);
				Kill++;
			} else {
				closelog();

				cfg_loadAttribute(&cfg, "dwds", "name", &name, DWDS_NAME);
				openlog(AIT_GET_STR(&name), LOG_PID | LOG_CONS, LOG_DAEMON);
				AIT_FREE_VAL(&name);
				v = cfg_getAttribute(&cfg, "dwds", "syslog_upto");
				setlogmask(v ? strtol(v, NULL, 0) : 0);
			}
			break;
		case SIGTERM:
			Kill++;
			break;
		case SIGCHLD:
			while (waitpid(-1, &stat, WNOHANG) > 0);
			break;
	}
}

static int
RtMsg(struct dwds_if **wds, struct rt_msghdr *msg, size_t len)
{
	struct if_announcemsghdr *ifan;
	const char *v;
	struct ether_addr bssid;
	ait_val_t Str, Ident;
	char szCmd[MAXPATHLEN] = { 0 }, szName[IFNAMSIZ] = { 0 };
	int f, stat;

	assert(wds);
	assert(msg);

	if (msg->rtm_version != RTM_VERSION) {
		syslog(LOG_ERR, "Error:: routing message version %d not understood!\n", msg->rtm_version);
		return -1;
	}

	switch (msg->rtm_type) {
		case RTM_IFANNOUNCE:
			ifan = (struct if_announcemsghdr*) msg;
			switch (ifan->ifan_what) {
				case IFAN_ARRIVAL:
					VERB(1) syslog(LOG_INFO, "RTM_IFANNOUNCE: if# %d, what: arrival\n", 
							ifan->ifan_index);
					break;
				case IFAN_DEPARTURE:
					VERB(1) syslog(LOG_INFO, "RTM_IFANNOUNCE: if# %d, what: departure\n", 
							ifan->ifan_index);
					wifi_destroyWDS(ifan->ifan_name, wds);
					break;
			}
			break;
		case RTM_IEEE80211:
#define	V(type)	((struct type *)(&ifan[1]))
			ifan = (struct if_announcemsghdr*) msg;
			switch (ifan->ifan_what) {
				case RTM_IEEE80211_DISASSOC:
					v = cfg_getAttribute(&cfg, "dwds", "discover_on_join");
					if (!v || !strtol(v, NULL, 0))
						break;
					/* fall thru ... */
				case RTM_IEEE80211_LEAVE:
					if (!wifi_chkIface(ifan->ifan_name, ifs, nif))
						break;
					memcpy(&bssid, V(ieee80211_leave_event)->iev_addr, ETHER_ADDR_LEN);
					VERB(1) syslog(LOG_INFO, "BSSID:%s Station leave\n", ether_ntoa(&bssid));
					if (!wifi_leaveWDS(bssid, wds, szName, IFNAMSIZ)) {
						cfg_loadAttribute(&cfg, "dwds", "name", &Ident, DWDS_NAME);
						/* delete state file ... */
						v = cfg_getAttribute(&cfg, "dwds", "state_dir");
						if (v) {
							memset(szCmd, 0, STRSIZ);
							snprintf(szCmd, MAXPATHLEN, "%s/%s-%s-%s", v, szName, 
									ether_ntoa(&bssid), AIT_GET_STR(&Ident));
							unlink(szCmd);
							VERB(2) syslog(LOG_DEBUG, "Debug:: delete session name %s\n", szCmd);
						}

						/* Launch script ... */
						cfg_loadAttribute(&cfg, "dwds", "disassoc_event", &Str, NULL);
						if (!AIT_ISEMPTY(&Str)) {
							memset(szCmd, 0, MAXPATHLEN);
							snprintf(szCmd, MAXPATHLEN, "%s %s %s %s", AIT_GET_STR(&Str), 
									szName, ether_ntoa(&bssid), AIT_GET_STR(&Ident));
							VERB(3) syslog(LOG_DEBUG, "Debug:: Command line: %s\n", szCmd);

							if ((stat = system(szCmd)))
								syslog(LOG_ERR, "VAP down script %s exited "
										"with status %d\n", 
										AIT_GET_STR(&Str), stat);
							AIT_FREE_VAL(&Str);
						}
						AIT_FREE_VAL(&Ident);
					}
					break;

				case RTM_IEEE80211_JOIN:
				case RTM_IEEE80211_REJOIN:
				case RTM_IEEE80211_ASSOC:
				case RTM_IEEE80211_REASSOC:
					v = cfg_getAttribute(&cfg, "dwds", "discover_on_join");
					if (!v || !strtol(v, NULL, 0))
						break;
					/* fall thru ... */
				case RTM_IEEE80211_WDS:
					memcpy(&bssid, V(ieee80211_leave_event)->iev_addr, ETHER_ADDR_LEN);
					VERB(1) syslog(LOG_INFO, "BSSID:%s WDS discovery\n", ether_ntoa(&bssid));
					if (!wifi_chkIface(ifan->ifan_name, ifs, nif))
						break;
					if (!wifi_createWDS(ifan->ifan_name, bssid, wds)) {
						cfg_loadAttribute(&cfg, "dwds", "name", &Ident, DWDS_NAME);
						/* create state file ... */
						v = cfg_getAttribute(&cfg, "dwds", "state_dir");
						if (v) {
							memset(szCmd, 0, MAXPATHLEN);
							snprintf(szCmd, MAXPATHLEN, "%s/%s-%s-%s", (char*) v, 
									(*wds)->if_name, ether_ntoa(&bssid), 
									AIT_GET_STR(&Ident));
							f = open(szCmd, O_WRONLY | O_CREAT, 0644);
							if (f != -1)
								close(f);
							VERB(2) syslog(LOG_DEBUG, "Debug:: create session name %s\n", szCmd);
						}

						/* Launch script ... */
						cfg_loadAttribute(&cfg, "dwds", "assoc_event", &Str, NULL);
						if (!AIT_ISEMPTY(&Str)) {
							memset(szCmd, 0, MAXPATHLEN);
							snprintf(szCmd, MAXPATHLEN, "%s %s %s %s", AIT_GET_STR(&Str), 
									(*wds)->if_name, ether_ntoa(&bssid), 
									AIT_GET_STR(&Ident));
							VERB(3) syslog(LOG_DEBUG, "Debug:: Command line: %s\n", szCmd);

							if ((stat = system(szCmd)))
								syslog(LOG_ERR, "VAP up script %s exited "
										"with status %d\n", 
										AIT_GET_STR(&Str), stat);
							AIT_FREE_VAL(&Str);
						}
						AIT_FREE_VAL(&Ident);
					}
					break;
			}
#undef V
			break;
	}

	return 0;
}


int
main(int argc, char **argv)
{
	char ch, fg = 0;
	ait_val_t Ident;
	const char *v, msg[2048];
	int s;
	struct sigaction sa;
	size_t len;
	struct dwds_if *wds = NULL;

	while ((ch = getopt(argc, argv, "hvfc:")) != -1)
		switch (ch) {
			case 'v':
				Verbose++;
				break;
			case 'f':
				fg = 1;
				break;
			case 'c':
				strlcpy(szConfig, optarg, MAXPATHLEN);
				break;
			case 'h':
			default:
				Usage();
				return 1;
		}
	argc -= optind;
	argv += optind;
	if (!argc) {
		printf("Error:: not specified interface for use ...\n");
		Usage();
		return 1;
	} else {
		nif = argc;
		ifs = argv;
	}
	if (cfgLoadConfig(szConfig, &cfg)) {
		printf("Error:: can`t load config %s ...\n", szConfig);
		return 1;
	}

	if (!fg)
		switch (fork()) {
			case -1:
				printf("Error:: when fork() #%d - %s\n", errno, strerror(errno));
				cfgUnloadConfig(&cfg);
				return 2;
			case 0 :
				VERB(1) printf("Going to shadow land ...\n");

				setsid();

				memset(&sa, 0, sizeof sa);
				sa.sa_handler = sigHandler;
				sigemptyset(&sa.sa_mask);
				sigaction(SIGHUP, &sa, NULL);
				sigaction(SIGTERM, &sa, NULL);
				sigaction(SIGCHLD, &sa, NULL);
				break;
			default:
				goto end;
		}

	cfg_loadAttribute(&cfg, "dwds", "name", &Ident, DWDS_NAME);
	openlog(AIT_GET_STR(&Ident), LOG_PID | LOG_CONS, LOG_DAEMON);
	AIT_FREE_VAL(&Ident);
	v = cfg_getAttribute(&cfg, "dwds", "syslog_upto");
	setlogmask(v ? strtol(v, NULL, 0) : 0);

	s = socket(PF_ROUTE, SOCK_RAW, 0);
	if (s == -1) {
		syslog(LOG_ERR, "Error:: socket() #%d - %s\n", errno, strerror(errno));
		goto end;
	}

	if (!(wds = wifi_buildWDS(s, ifs, nif))) {
		syslog(LOG_ERR, "Error:: Go to dead ...\n");
		goto end;
	}

	while (!Kill) {
		len = read(s, (void*) msg, sizeof msg);
		if (len == -1) {
			VERB(5) syslog(LOG_ERR, "Error:: read() #%d - %s\n", errno, strerror(errno));
			Kill++;
		} else
			RtMsg(&wds, (struct rt_msghdr*) msg, len);
	}

	close(s);
end:
	closelog();
	cfgUnloadConfig(&cfg);
	return 0;
}