--- embedtools/src/dwds.c 2010/10/27 13:29:06 1.1.2.2 +++ embedtools/src/dwds.c 2012/07/22 22:46:47 1.3 @@ -1,18 +1,64 @@ +/************************************************************************* + * (C) 2010 AITNET - Sofia/Bulgaria - + * by Michael Pounov + * + * $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 + +Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 + by Michael Pounov . 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 +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" -int Verbose, Kill; -char szConfig[MAXPATHLEN] = DWDS_CONFIG; +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" + printf( "-= dWDS =- WiFi dynamic WDS service managment for VAP\n" "=== %s === %s@%s ===\n\n" - " Syntax: dwds [options] [interface(s) ...]\n" + " Syntax: dwds [options] [interface [ath0, ...]]\n" "\n" "\t-v\t\tVerbose ...\n" "\t-f\t\tForeground, not demonize process ...\n" @@ -20,12 +66,263 @@ Usage() "\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; }