Force kill OpenVPN process on stopping service

[tomato.git] / release / src / router / rc / vpn.c

/*

        Copyright (C) 2008-2010 Keith Moyer, tomatovpn@keithmoyer.com

        No part of this file may be used without permission.

*/

#include "rc.h"
#include <sys/types.h>
#include <dirent.h>
#include <string.h>

// Line number as text string
#define __LINE_T__ __LINE_T_(__LINE__)
#define __LINE_T_(x) __LINE_T(x)
#define __LINE_T(x) # x

#define VPN_LOG_ERROR -1
#define VPN_LOG_NOTE 0
#define VPN_LOG_INFO 1
#define VPN_LOG_EXTRA 2
#define vpnlog(level,x...) if(nvram_get_int("vpn_debug")>=level) syslog(LOG_INFO, #level ": " __LINE_T__ ": " x)

#define CLIENT_IF_START 10
#define SERVER_IF_START 20

#define BUF_SIZE 128
#define IF_SIZE 8

void start_vpnclient(int clientNum)
{
        FILE *fp;
        char iface[IF_SIZE];
        char buffer[BUF_SIZE];
        char *argv[5];
        int argc = 0;
        enum { TLS, SECRET, CUSTOM } cryptMode = CUSTOM;
        enum { TAP, TUN } ifType = TUN;
        enum { BRIDGE, NAT, NONE } routeMode = NONE;
        int nvi, ip[4], nm[4];
        long int nvl;

        vpnlog(VPN_LOG_INFO,"VPN GUI client backend starting...");

        sprintf(&buffer[0], "vpnclient%d", clientNum);
        if ( pidof(&buffer[0]) >= 0 )
        {
                vpnlog(VPN_LOG_NOTE, "VPN Client %d already running...", clientNum);
                vpnlog(VPN_LOG_INFO,"PID: %d", pidof(&buffer[0]));
                return;
        }

        // Determine interface
        sprintf(&buffer[0], "vpn_client%d_if", clientNum);
        if ( nvram_contains_word(&buffer[0], "tap") )
                ifType = TAP;
        else if ( nvram_contains_word(&buffer[0], "tun") )
                ifType = TUN;
        else
        {
                vpnlog(VPN_LOG_ERROR, "Invalid interface type, %.3s", nvram_safe_get(&buffer[0]));
                return;
        }

        // Build interface name
        snprintf(&iface[0], IF_SIZE, "%s%d", nvram_safe_get(&buffer[0]), clientNum+CLIENT_IF_START);

        // Determine encryption mode
        sprintf(&buffer[0], "vpn_client%d_crypt", clientNum);
        if ( nvram_contains_word(&buffer[0], "tls") )
                cryptMode = TLS;
        else if ( nvram_contains_word(&buffer[0], "secret") )
                cryptMode = SECRET;
        else if ( nvram_contains_word(&buffer[0], "custom") )
                cryptMode = CUSTOM;
        else
        {
                vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", nvram_safe_get(&buffer[0]));
                return;
        }

        // Determine if we should bridge the tunnel
        sprintf(&buffer[0], "vpn_client%d_bridge", clientNum);
        if ( ifType == TAP && nvram_get_int(&buffer[0]) == 1 )
                routeMode = BRIDGE;

        // Determine if we should NAT the tunnel
        sprintf(&buffer[0], "vpn_client%d_nat", clientNum);
        if ( (ifType == TUN || routeMode != BRIDGE) && nvram_get_int(&buffer[0]) == 1 )
                routeMode = NAT;

        // Make sure openvpn directory exists
        mkdir("/etc/openvpn", 0700);
        sprintf(&buffer[0], "/etc/openvpn/client%d", clientNum);
        mkdir(&buffer[0], 0700);

        // Make sure symbolic link exists
        sprintf(&buffer[0], "/etc/openvpn/vpnclient%d", clientNum);
        unlink(&buffer[0]);
        if ( symlink("/usr/sbin/openvpn", &buffer[0]) )
        {
                vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
                stop_vpnclient(clientNum);
                return;
        }

        // Make sure module is loaded
        modprobe("tun");

        // Create tap/tun interface
        sprintf(&buffer[0], "openvpn --mktun --dev %s", &iface[0]);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        if ( _eval(argv, NULL, 0, NULL) )
        {
                vpnlog(VPN_LOG_ERROR,"Creating tunnel interface failed...");
                stop_vpnclient(clientNum);
                return;
        }

        // Bring interface up (TAP only)
        if( ifType == TAP )
        {
                if ( routeMode == BRIDGE )
                {
                        snprintf(&buffer[0], BUF_SIZE, "brctl addif %s %s", nvram_safe_get("lan_ifname"), &iface[0]);
                        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
                        if ( _eval(argv, NULL, 0, NULL) )
                        {
                                vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
                                stop_vpnclient(clientNum);
                                return;
                        }
                }

                snprintf(&buffer[0], BUF_SIZE, "ifconfig %s promisc up", &iface[0]);
                for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
                if ( _eval(argv, NULL, 0, NULL) )
                {
                        vpnlog(VPN_LOG_ERROR,"Bringing interface up failed...");
                        stop_vpnclient(clientNum);
                        return;
                }
        }

        // Build and write config file
        vpnlog(VPN_LOG_EXTRA,"Writing config file");
        sprintf(&buffer[0], "/etc/openvpn/client%d/config.ovpn", clientNum);
        fp = fopen(&buffer[0], "w");
        chmod(&buffer[0], S_IRUSR|S_IWUSR);
        fprintf(fp, "# Automatically generated configuration\n");
        fprintf(fp, "daemon\n");
        if ( cryptMode == TLS )
                fprintf(fp, "client\n");
        fprintf(fp, "dev %s\n", &iface[0]);
        sprintf(&buffer[0], "vpn_client%d_proto", clientNum);
        fprintf(fp, "proto %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_client%d_addr", clientNum);
        fprintf(fp, "remote %s ", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_client%d_port", clientNum);
        fprintf(fp, "%d\n", nvram_get_int(&buffer[0]));
        if ( cryptMode == SECRET )
        {
                if ( ifType == TUN )
                {
                        sprintf(&buffer[0], "vpn_client%d_local", clientNum);
                        fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
                        sprintf(&buffer[0], "vpn_client%d_remote", clientNum);
                        fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
                }
                else if ( ifType == TAP )
                {
                        sprintf(&buffer[0], "vpn_client%d_local", clientNum);
                        fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
                        sprintf(&buffer[0], "vpn_client%d_nm", clientNum);
                        fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
                }
        }
        sprintf(&buffer[0], "vpn_client%d_retry", clientNum);
        if ( (nvi = nvram_get_int(&buffer[0])) >= 0 )
                fprintf(fp, "resolv-retry %d\n", nvi);
        else
                fprintf(fp, "resolv-retry infinite\n");
        sprintf(&buffer[0], "vpn_client%d_reneg", clientNum);
        if ( (nvl = atol(nvram_safe_get(&buffer[0]))) >= 0 )
                fprintf(fp, "reneg-sec %ld\n", nvl);
        fprintf(fp, "nobind\n");
        fprintf(fp, "persist-key\n");
        fprintf(fp, "persist-tun\n");
        sprintf(&buffer[0], "vpn_client%d_comp", clientNum);
        if ( nvram_get_int(&buffer[0]) >= 0 )
                fprintf(fp, "comp-lzo %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_client%d_cipher", clientNum);
        if ( !nvram_contains_word(&buffer[0], "default") )
                fprintf(fp, "cipher %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_client%d_rgw", clientNum);
        if ( (nvi = nvram_get_int(&buffer[0])) )
        {
                sprintf(&buffer[0], "vpn_client%d_gw", clientNum);
                if ( ifType == TAP && nvram_safe_get(&buffer[0])[0] != '\0' )
                        fprintf(fp, "route-gateway %s\n", nvram_safe_get(&buffer[0]));
                fprintf(fp, "redirect-gateway%s\n", nvi>1? "": " def1");
        }
        fprintf(fp, "verb 3\n");
        if ( cryptMode == TLS )
        {
                sprintf(&buffer[0], "vpn_client%d_adns", clientNum);
                if ( nvram_get_int(&buffer[0]) > 0 )
                {
                        sprintf(&buffer[0], "/etc/openvpn/client%d/updown.sh", clientNum);
                        symlink("/rom/openvpn/updown.sh", &buffer[0]);
                        fprintf(fp, "script-security 2\n");
                        fprintf(fp, "up updown.sh\n");
                        fprintf(fp, "down updown.sh\n");
                }

                sprintf(&buffer[0], "vpn_client%d_hmac", clientNum);
                nvi = nvram_get_int(&buffer[0]);
                sprintf(&buffer[0], "vpn_client%d_static", clientNum);
                if ( !nvram_is_empty(&buffer[0]) && nvi >= 0 )
                {
                        fprintf(fp, "tls-auth static.key");
                        if ( nvi < 2 )
                                fprintf(fp, " %d", nvi);
                        fprintf(fp, "\n");
                }

                sprintf(&buffer[0], "vpn_client%d_ca", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "ca ca.crt\n");
                sprintf(&buffer[0], "vpn_client%d_crt", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "cert client.crt\n");
                sprintf(&buffer[0], "vpn_client%d_key", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "key client.key\n");
        }
        else if ( cryptMode == SECRET )
        {
                sprintf(&buffer[0], "vpn_client%d_static", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "secret static.key\n");
        }
        fprintf(fp, "status-version 2\n");
        fprintf(fp, "status status\n");
        fprintf(fp, "\n# Custom Configuration\n");
        sprintf(&buffer[0], "vpn_client%d_custom", clientNum);
        fprintf(fp, nvram_safe_get(&buffer[0]));
        fclose(fp);
        vpnlog(VPN_LOG_EXTRA,"Done writing config file");

        // Write certification and key files
        vpnlog(VPN_LOG_EXTRA,"Writing certs/keys");
        if ( cryptMode == TLS )
        {
                sprintf(&buffer[0], "vpn_client%d_ca", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/client%d/ca.crt", clientNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_client%d_ca", clientNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }

                sprintf(&buffer[0], "vpn_client%d_key", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/client%d/client.key", clientNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_client%d_key", clientNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }

                sprintf(&buffer[0], "vpn_client%d_crt", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/client%d/client.crt", clientNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_client%d_crt", clientNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }
        }
        sprintf(&buffer[0], "vpn_client%d_hmac", clientNum);
        if ( cryptMode == SECRET || (cryptMode == TLS && nvram_get_int(&buffer[0]) >= 0) )
        {
                sprintf(&buffer[0], "vpn_client%d_static", clientNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/client%d/static.key", clientNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_client%d_static", clientNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }
        }
        vpnlog(VPN_LOG_EXTRA,"Done writing certs/keys");

        // Start the VPN client
        sprintf(&buffer[0], "/etc/openvpn/vpnclient%d --cd /etc/openvpn/client%d --config config.ovpn", clientNum, clientNum);
        vpnlog(VPN_LOG_INFO,"Starting OpenVPN: %s",&buffer[0]);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        if ( _eval(argv, NULL, 0, NULL) )
        {
                vpnlog(VPN_LOG_ERROR,"Starting OpenVPN failed...");
                stop_vpnclient(clientNum);
                return;
        }
        vpnlog(VPN_LOG_EXTRA,"Done starting openvpn");

        // Handle firewall rules if appropriate
        sprintf(&buffer[0], "vpn_client%d_firewall", clientNum);
        if ( !nvram_contains_word(&buffer[0], "custom") )
        {
                // Create firewall rules
                vpnlog(VPN_LOG_EXTRA,"Creating firewall rules");
                mkdir("/etc/openvpn/fw", 0700);
                sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
                fp = fopen(&buffer[0], "w");
                chmod(&buffer[0], S_IRUSR|S_IWUSR|S_IXUSR);
                fprintf(fp, "#!/bin/sh\n");
                fprintf(fp, "iptables -I INPUT -i %s -j ACCEPT\n", &iface[0]);
                fprintf(fp, "iptables -I FORWARD -i %s -j ACCEPT\n", &iface[0]);
                if ( routeMode == NAT )
                {
                        sscanf(nvram_safe_get("lan_ipaddr"), "%d.%d.%d.%d", &ip[0], &ip[1], &ip[2], &ip[3]);
                        sscanf(nvram_safe_get("lan_netmask"), "%d.%d.%d.%d", &nm[0], &nm[1], &nm[2], &nm[3]);
                        fprintf(fp, "iptables -t nat -I POSTROUTING -s %d.%d.%d.%d/%s -o %s -j MASQUERADE\n",
                                ip[0]&nm[0], ip[1]&nm[1], ip[2]&nm[2], ip[3]&nm[3], nvram_safe_get("lan_netmask"), &iface[0]);
                }
                fclose(fp);
                vpnlog(VPN_LOG_EXTRA,"Done creating firewall rules");

                // Run the firewall rules
                vpnlog(VPN_LOG_EXTRA,"Running firewall rules");
                sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
                argv[0] = &buffer[0];
                argv[1] = NULL;
                _eval(argv, NULL, 0, NULL);
                vpnlog(VPN_LOG_EXTRA,"Done running firewall rules");
        }

        // Set up cron job
        sprintf(&buffer[0], "vpn_client%d_poll", clientNum);
        if ( (nvi = nvram_get_int(&buffer[0])) > 0 )
        {
                vpnlog(VPN_LOG_EXTRA,"Adding cron job");
                argv[0] = "cru";
                argv[1] = "a";  
                sprintf(&buffer[0], "CheckVPNClient%d", clientNum);
                argv[2] = &buffer[0];
                sprintf(&buffer[strlen(&buffer[0])+1], "*/%d * * * * service vpnclient%d start", nvi, clientNum);
                argv[3] = &buffer[strlen(&buffer[0])+1];
                argv[4] = NULL;
                _eval(argv, NULL, 0, NULL);
                vpnlog(VPN_LOG_EXTRA,"Done adding cron job");
        }

        vpnlog(VPN_LOG_INFO,"VPN GUI client backend complete.");
}

void stop_vpnclient(int clientNum)
{
        int argc;
        char *argv[7];
        char buffer[BUF_SIZE];

        vpnlog(VPN_LOG_INFO,"Stopping VPN GUI client backend.");

        // Remove cron job
        vpnlog(VPN_LOG_EXTRA,"Removing cron job");
        argv[0] = "cru";
        argv[1] = "d";  
        sprintf(&buffer[0], "CheckVPNClient%d", clientNum);
        argv[2] = &buffer[0];
        argv[3] = NULL;
        _eval(argv, NULL, 0, NULL);
        vpnlog(VPN_LOG_EXTRA,"Done removing cron job");

        // Remove firewall rules
        vpnlog(VPN_LOG_EXTRA,"Removing firewall rules.");
        sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
        argv[0] = "sed";
        argv[1] = "-i";
        argv[2] = "s/-A/-D/g;s/-I/-D/g";
        argv[3] = &buffer[0];
        argv[4] = NULL;
        if (!_eval(argv, NULL, 0, NULL))
        {
                argv[0] = &buffer[0];
                argv[1] = NULL;
                _eval(argv, NULL, 0, NULL);
        }
        vpnlog(VPN_LOG_EXTRA,"Done removing firewall rules.");

        // Stop the VPN client
        vpnlog(VPN_LOG_EXTRA,"Stopping OpenVPN client.");
        sprintf(&buffer[0], "vpnclient%d", clientNum);
        killall(&buffer[0], SIGTERM);
        vpnlog(VPN_LOG_EXTRA,"OpenVPN client stopped.");

        // NVRAM setting for device type could have changed, just try to remove both
        vpnlog(VPN_LOG_EXTRA,"Removing VPN device.");
        sprintf(&buffer[0], "openvpn --rmtun --dev tap%d", clientNum+CLIENT_IF_START);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        _eval(argv, NULL, 0, NULL);

        sprintf(&buffer[0], "openvpn --rmtun --dev tun%d", clientNum+CLIENT_IF_START);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        _eval(argv, NULL, 0, NULL);
        vpnlog(VPN_LOG_EXTRA,"VPN device removed.");

        modprobe_r("tun");

        if ( nvram_get_int("vpn_debug") <= VPN_LOG_EXTRA )
        {
                vpnlog(VPN_LOG_EXTRA,"Removing generated files.");
                // Delete all files for this client
                sprintf(&buffer[0], "rm -rf /etc/openvpn/client%d /etc/openvpn/fw/client%d-fw.sh /etc/openvpn/vpnclient%d",clientNum,clientNum,clientNum);
                for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
                _eval(argv, NULL, 0, NULL);

                // Attempt to remove directories.  Will fail if not empty
                rmdir("/etc/openvpn/fw");
                rmdir("/etc/openvpn");
                vpnlog(VPN_LOG_EXTRA,"Done removing generated files.");
        }

        // Force OpenVPN process to end.  If we don't do this then it doesn't actually exit until
        // all current queued service actions are run, including starting vpn back up (which
        // will bail since the process is still running
        vpnlog(VPN_LOG_EXTRA,"Killing OpenVPN client.");
        sprintf(&buffer[0], "vpnclient%d", clientNum);
        killall(&buffer[0], SIGKILL);
        vpnlog(VPN_LOG_EXTRA,"OpenVPN client killed.");

        vpnlog(VPN_LOG_INFO,"VPN GUI client backend stopped.");
}

void start_vpnserver(int serverNum)
{
        FILE *fp, *ccd;
        char iface[IF_SIZE];
        char buffer[BUF_SIZE];
        char *argv[6], *chp, *route;
        int argc = 0;
        int c2c = 0;
        enum { TAP, TUN } ifType = TUN;
        enum { TLS, SECRET, CUSTOM } cryptMode = CUSTOM;
        int nvi, ip[4], nm[4];
        long int nvl;

        vpnlog(VPN_LOG_INFO,"VPN GUI server backend starting...");

        sprintf(&buffer[0], "vpnserver%d", serverNum);
        if ( pidof(&buffer[0]) >= 0 )
        {
                vpnlog(VPN_LOG_NOTE, "VPN Server %d already running...", serverNum);
                vpnlog(VPN_LOG_INFO,"PID: %d", pidof(&buffer[0]));
                return;
        }

        // Determine interface type
        sprintf(&buffer[0], "vpn_server%d_if", serverNum);
        if ( nvram_contains_word(&buffer[0], "tap") )
                ifType = TAP;
        else if ( nvram_contains_word(&buffer[0], "tun") )
                ifType = TUN;
        else
        {
                vpnlog(VPN_LOG_ERROR,"Invalid interface type, %.3s", nvram_safe_get(&buffer[0]));
                return;
        }

        // Build interface name
        snprintf(&iface[0], IF_SIZE, "%s%d", nvram_safe_get(&buffer[0]), serverNum+SERVER_IF_START);

        // Determine encryption mode
        sprintf(&buffer[0], "vpn_server%d_crypt", serverNum);
        if ( nvram_contains_word(&buffer[0], "tls") )
                cryptMode = TLS;
        else if ( nvram_contains_word(&buffer[0], "secret") )
                cryptMode = SECRET;
        else if ( nvram_contains_word(&buffer[0], "custom") )
                cryptMode = CUSTOM;
        else
        {
                vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", nvram_safe_get(&buffer[0]));
                return;
        }

        // Make sure openvpn directory exists
        mkdir("/etc/openvpn", 0700);
        sprintf(&buffer[0], "/etc/openvpn/server%d", serverNum);
        mkdir(&buffer[0], 0700);

        // Make sure symbolic link exists
        sprintf(&buffer[0], "/etc/openvpn/vpnserver%d", serverNum);
        unlink(&buffer[0]);
        if ( symlink("/usr/sbin/openvpn", &buffer[0]) )
        {
                vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
                stop_vpnserver(serverNum);
                return;
        }

        // Make sure module is loaded
        modprobe("tun");

        // Create tap/tun interface
        sprintf(&buffer[0], "openvpn --mktun --dev %s", &iface[0]);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        if ( _eval(argv, NULL, 0, NULL) )
        {
                vpnlog(VPN_LOG_ERROR,"Creating tunnel interface failed...");
                stop_vpnserver(serverNum);
                return;
        }

        // Add interface to LAN bridge (TAP only)
        if( ifType == TAP )
        {
                snprintf(&buffer[0], BUF_SIZE, "brctl addif %s %s", nvram_safe_get("lan_ifname"), &iface[0]);
                for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
                if ( _eval(argv, NULL, 0, NULL) )
                {
                        vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
                        stop_vpnserver(serverNum);
                        return;
                }
        }

        // Bring interface up
        sprintf(&buffer[0], "ifconfig %s 0.0.0.0 promisc up", &iface[0]);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        if ( _eval(argv, NULL, 0, NULL) )
        {
                vpnlog(VPN_LOG_ERROR,"Bringing up tunnel interface failed...");
                stop_vpnserver(serverNum);
                return;
        }

        // Build and write config files
        vpnlog(VPN_LOG_EXTRA,"Writing config file");
        sprintf(&buffer[0], "/etc/openvpn/server%d/config.ovpn", serverNum);
        fp = fopen(&buffer[0], "w");
        chmod(&buffer[0], S_IRUSR|S_IWUSR);
        fprintf(fp, "# Automatically generated configuration\n");
        fprintf(fp, "daemon\n");
        if ( cryptMode == TLS )
        {
                if ( ifType == TUN )
                {
                        sprintf(&buffer[0], "vpn_server%d_sn", serverNum);
                        fprintf(fp, "server %s ", nvram_safe_get(&buffer[0]));
                        sprintf(&buffer[0], "vpn_server%d_nm", serverNum);
                        fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
                }
                else if ( ifType == TAP )
                {
                        fprintf(fp, "server-bridge");
                        sprintf(&buffer[0], "vpn_server%d_dhcp", serverNum);
                        if ( nvram_get_int(&buffer[0]) == 0 )
                        {
                                fprintf(fp, " %s ", nvram_safe_get("lan_ipaddr"));
                                fprintf(fp, "%s ", nvram_safe_get("lan_netmask"));
                                sprintf(&buffer[0], "vpn_server%d_r1", serverNum);
                                fprintf(fp, "%s ", nvram_safe_get(&buffer[0]));
                                sprintf(&buffer[0], "vpn_server%d_r2", serverNum);
                                fprintf(fp, "%s", nvram_safe_get(&buffer[0]));
                        }
                        fprintf(fp, "\n");
                }
        }
        else if ( cryptMode == SECRET )
        {
                if ( ifType == TUN )
                {
                        sprintf(&buffer[0], "vpn_server%d_local", serverNum);
                        fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
                        sprintf(&buffer[0], "vpn_server%d_remote", serverNum);
                        fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
                }
        }
        sprintf(&buffer[0], "vpn_server%d_proto", serverNum);
        fprintf(fp, "proto %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_server%d_port", serverNum);
        fprintf(fp, "port %d\n", nvram_get_int(&buffer[0]));
        fprintf(fp, "dev %s\n", &iface[0]);
        sprintf(&buffer[0], "vpn_server%d_cipher", serverNum);
        if ( !nvram_contains_word(&buffer[0], "default") )
                fprintf(fp, "cipher %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_server%d_comp", serverNum);
        if ( nvram_get_int(&buffer[0]) >= 0 )
                fprintf(fp, "comp-lzo %s\n", nvram_safe_get(&buffer[0]));
        sprintf(&buffer[0], "vpn_server%d_reneg", serverNum);
        if ( (nvl = atol(nvram_safe_get(&buffer[0]))) >= 0 )
                fprintf(fp, "reneg-sec %ld\n", nvl);
        fprintf(fp, "keepalive 15 60\n");
        fprintf(fp, "verb 3\n");
        if ( cryptMode == TLS )
        {
                sprintf(&buffer[0], "vpn_server%d_plan", serverNum);
                if ( ifType == TUN && nvram_get_int(&buffer[0]) )
                {
                        sscanf(nvram_safe_get("lan_ipaddr"), "%d.%d.%d.%d", &ip[0], &ip[1], &ip[2], &ip[3]);
                        sscanf(nvram_safe_get("lan_netmask"), "%d.%d.%d.%d", &nm[0], &nm[1], &nm[2], &nm[3]);
                        fprintf(fp, "push \"route %d.%d.%d.%d %s\"\n", ip[0]&nm[0], ip[1]&nm[1], ip[2]&nm[2], ip[3]&nm[3],
                                nvram_safe_get("lan_netmask"));
                }

                sprintf(&buffer[0], "vpn_server%d_ccd", serverNum);
                if ( nvram_get_int(&buffer[0]) )
                {
                        fprintf(fp, "client-config-dir ccd\n");

                        sprintf(&buffer[0], "vpn_server%d_c2c", serverNum);
                        if ( (c2c = nvram_get_int(&buffer[0])) )
                                fprintf(fp, "client-to-client\n");

                        sprintf(&buffer[0], "vpn_server%d_ccd_excl", serverNum);
                        if ( nvram_get_int(&buffer[0]) )
                                fprintf(fp, "ccd-exclusive\n");

                        sprintf(&buffer[0], "/etc/openvpn/server%d/ccd", serverNum);
                        mkdir(&buffer[0], 0700);
                        chdir(&buffer[0]);

                        sprintf(&buffer[0], "vpn_server%d_ccd_val", serverNum);
                        strcpy(&buffer[0], nvram_safe_get(&buffer[0]));
                        chp = strtok(&buffer[0],">");
                        while ( chp != NULL )
                        {
                                nvi = strlen(chp);

                                chp[strcspn(chp,"<")] = '\0';
                                vpnlog(VPN_LOG_EXTRA,"CCD: enabled: %d", atoi(chp));
                                if ( atoi(chp) == 1 )
                                {
                                        nvi -= strlen(chp)+1;
                                        chp += strlen(chp)+1;

                                        ccd = NULL;
                                        route = NULL;
                                        if ( nvi > 0 )
                                        {
                                                chp[strcspn(chp,"<")] = '\0';
                                                vpnlog(VPN_LOG_EXTRA,"CCD: Common name: %s", chp);
                                                ccd = fopen(chp, "w");
                                                chmod(chp, S_IRUSR|S_IWUSR);

                                                nvi -= strlen(chp)+1;
                                                chp += strlen(chp)+1;
                                        }
                                        if ( nvi > 0 && ccd != NULL && strcspn(chp,"<") != strlen(chp) )
                                        {
                                                chp[strcspn(chp,"<")] = ' ';
                                                chp[strcspn(chp,"<")] = '\0';
                                                route = chp;
                                                vpnlog(VPN_LOG_EXTRA,"CCD: Route: %s", chp);
                                                if ( strlen(route) > 1 )
                                                {
                                                        fprintf(ccd, "iroute %s\n", route);
                                                        fprintf(fp, "route %s\n", route);
                                                }

                                                nvi -= strlen(chp)+1;
                                                chp += strlen(chp)+1;
                                        }
                                        if ( ccd != NULL )
                                                fclose(ccd);
                                        if ( nvi > 0 && route != NULL )
                                        {
                                                chp[strcspn(chp,"<")] = '\0';
                                                vpnlog(VPN_LOG_EXTRA,"CCD: Push: %d", atoi(chp));
                                                if ( c2c && atoi(chp) == 1 && strlen(route) > 1 )
                                                        fprintf(fp, "push \"route %s\"\n", route);

                                                nvi -= strlen(chp)+1;
                                                chp += strlen(chp)+1;
                                        }

                                        vpnlog(VPN_LOG_EXTRA,"CCD leftover: %d", nvi+1);
                                }
                                // Advance to next entry
                                chp = strtok(NULL, ">");
                        }
                        vpnlog(VPN_LOG_EXTRA,"CCD processing complete");
                }

                sprintf(&buffer[0], "vpn_server%d_pdns", serverNum);
                if ( nvram_get_int(&buffer[0]) )
                {
                        if ( nvram_safe_get("wan_domain")[0] != '\0' )
                                fprintf(fp, "push \"dhcp-option DOMAIN %s\"\n", nvram_safe_get("wan_domain"));
                        if ( (nvram_safe_get("wan_wins")[0] != '\0' && strcmp(nvram_safe_get("wan_wins"), "0.0.0.0") != 0) )
                                fprintf(fp, "push \"dhcp-option WINS %s\"\n", nvram_safe_get("wan_wins"));
                        fprintf(fp, "push \"dhcp-option DNS %s\"\n", nvram_safe_get("lan_ipaddr"));
                }

                sprintf(&buffer[0], "vpn_server%d_rgw", serverNum);
                if ( (nvi = nvram_get_int(&buffer[0])) )
                {
                        if ( ifType == TAP )
                                fprintf(fp, "push \"route-gateway %s\"\n", nvram_safe_get("lan_ipaddr"));
                        fprintf(fp, "push \"redirect-gateway%s\"\n", nvi>1? "": "def1");
                }

                sprintf(&buffer[0], "vpn_server%d_hmac", serverNum);
                nvi = nvram_get_int(&buffer[0]);
                sprintf(&buffer[0], "vpn_server%d_static", serverNum);
                if ( !nvram_is_empty(&buffer[0]) && nvi >= 0 )
                {
                        fprintf(fp, "tls-auth static.key");
                        if ( nvi < 2 )
                                fprintf(fp, " %d", nvi);
                        fprintf(fp, "\n");
                }

                sprintf(&buffer[0], "vpn_server%d_ca", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "ca ca.crt\n");
                sprintf(&buffer[0], "vpn_server%d_dh", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "dh dh.pem\n");
                sprintf(&buffer[0], "vpn_server%d_crt", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "cert server.crt\n");
                sprintf(&buffer[0], "vpn_server%d_key", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "key server.key\n");
        }
        else if ( cryptMode == SECRET )
        {
                sprintf(&buffer[0], "vpn_server%d_static", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                        fprintf(fp, "secret static.key\n");
        }
        fprintf(fp, "status-version 2\n");
        fprintf(fp, "status status\n");
        fprintf(fp, "\n# Custom Configuration\n");
        sprintf(&buffer[0], "vpn_server%d_custom", serverNum);
        fprintf(fp, nvram_safe_get(&buffer[0]));
        fclose(fp);
        vpnlog(VPN_LOG_EXTRA,"Done writing config file");

        // Write certification and key files
        vpnlog(VPN_LOG_EXTRA,"Writing certs/keys");
        if ( cryptMode == TLS )
        {
                sprintf(&buffer[0], "vpn_server%d_ca", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/server%d/ca.crt", serverNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_server%d_ca", serverNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }

                sprintf(&buffer[0], "vpn_server%d_key", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/server%d/server.key", serverNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_server%d_key", serverNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }

                sprintf(&buffer[0], "vpn_server%d_crt", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/server%d/server.crt", serverNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_server%d_crt", serverNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }

                sprintf(&buffer[0], "vpn_server%d_dh", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/server%d/dh.pem", serverNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_server%d_dh", serverNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }
        }
        sprintf(&buffer[0], "vpn_server%d_hmac", serverNum);
        if ( cryptMode == SECRET || (cryptMode == TLS && nvram_get_int(&buffer[0]) >= 0) )
        {
                sprintf(&buffer[0], "vpn_server%d_static", serverNum);
                if ( !nvram_is_empty(&buffer[0]) )
                {
                        sprintf(&buffer[0], "/etc/openvpn/server%d/static.key", serverNum);
                        fp = fopen(&buffer[0], "w");
                        chmod(&buffer[0], S_IRUSR|S_IWUSR);
                        sprintf(&buffer[0], "vpn_server%d_static", serverNum);
                        fprintf(fp, nvram_safe_get(&buffer[0]));
                        fclose(fp);
                }
        }
        vpnlog(VPN_LOG_EXTRA,"Done writing certs/keys");

        sprintf(&buffer[0], "/etc/openvpn/vpnserver%d --cd /etc/openvpn/server%d --config config.ovpn", serverNum, serverNum);
        vpnlog(VPN_LOG_INFO,"Starting OpenVPN: %s",&buffer[0]);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        if ( _eval(argv, NULL, 0, NULL) )
        {
                vpnlog(VPN_LOG_ERROR,"Starting VPN instance failed...");
                stop_vpnserver(serverNum);
                return;
        }
        vpnlog(VPN_LOG_EXTRA,"Done starting openvpn");

        // Handle firewall rules if appropriate
        sprintf(&buffer[0], "vpn_server%d_firewall", serverNum);
        if ( !nvram_contains_word(&buffer[0], "custom") )
        {
                // Create firewall rules
                vpnlog(VPN_LOG_EXTRA,"Creating firewall rules");
                mkdir("/etc/openvpn/fw", 0700);
                sprintf(&buffer[0], "/etc/openvpn/fw/server%d-fw.sh", serverNum);
                fp = fopen(&buffer[0], "w");
                chmod(&buffer[0], S_IRUSR|S_IWUSR|S_IXUSR);
                fprintf(fp, "#!/bin/sh\n");
                sprintf(&buffer[0], "vpn_server%d_proto", serverNum);
                strncpy(&buffer[0], nvram_safe_get(&buffer[0]), BUF_SIZE);
                fprintf(fp, "iptables -t nat -I PREROUTING -p %s ", strtok(&buffer[0], "-"));
                sprintf(&buffer[0], "vpn_server%d_port", serverNum);
                fprintf(fp, "--dport %d -j ACCEPT\n", nvram_get_int(&buffer[0]));
                sprintf(&buffer[0], "vpn_server%d_proto", serverNum);
                strncpy(&buffer[0], nvram_safe_get(&buffer[0]), BUF_SIZE);
                fprintf(fp, "iptables -I INPUT -p %s ", strtok(&buffer[0], "-"));
                sprintf(&buffer[0], "vpn_server%d_port", serverNum);
                fprintf(fp, "--dport %d -j ACCEPT\n", nvram_get_int(&buffer[0]));
                sprintf(&buffer[0], "vpn_server%d_firewall", serverNum);
                if ( !nvram_contains_word(&buffer[0], "external") )
                {
                        fprintf(fp, "iptables -I INPUT -i %s -j ACCEPT\n", &iface[0]);
                        fprintf(fp, "iptables -I FORWARD -i %s -j ACCEPT\n", &iface[0]);
                }
                fclose(fp);
                vpnlog(VPN_LOG_EXTRA,"Done creating firewall rules");

                // Run the firewall rules
                vpnlog(VPN_LOG_EXTRA,"Running firewall rules");
                sprintf(&buffer[0], "/etc/openvpn/fw/server%d-fw.sh", serverNum);
                argv[0] = &buffer[0];
                argv[1] = NULL;
                _eval(argv, NULL, 0, NULL);
                vpnlog(VPN_LOG_EXTRA,"Done running firewall rules");
        }

        // Set up cron job
        sprintf(&buffer[0], "vpn_server%d_poll", serverNum);
        if ( (nvi = nvram_get_int(&buffer[0])) > 0 )
        {
                vpnlog(VPN_LOG_EXTRA,"Adding cron job");
                argv[0] = "cru";
                argv[1] = "a";  
                sprintf(&buffer[0], "CheckVPNServer%d", serverNum);
                argv[2] = &buffer[0];
                sprintf(&buffer[strlen(&buffer[0])+1], "*/%d * * * * service vpnserver%d start", nvi, serverNum);
                argv[3] = &buffer[strlen(&buffer[0])+1];
                argv[4] = NULL;
                _eval(argv, NULL, 0, NULL);
                vpnlog(VPN_LOG_EXTRA,"Done adding cron job");
        }

        vpnlog(VPN_LOG_INFO,"VPN GUI server backend complete.");
}

void stop_vpnserver(int serverNum)
{
        int argc;
        char *argv[9];
        char buffer[BUF_SIZE];

        vpnlog(VPN_LOG_INFO,"Stopping VPN GUI server backend.");

        // Remove cron job
        vpnlog(VPN_LOG_EXTRA,"Removing cron job");
        argv[0] = "cru";
        argv[1] = "d";  
        sprintf(&buffer[0], "CheckVPNServer%d", serverNum);
        argv[2] = &buffer[0];
        argv[3] = NULL;
        _eval(argv, NULL, 0, NULL);
        vpnlog(VPN_LOG_EXTRA,"Done removing cron job");

        // Remove firewall rules
        vpnlog(VPN_LOG_EXTRA,"Removing firewall rules.");
        sprintf(&buffer[0], "/etc/openvpn/fw/server%d-fw.sh", serverNum);
        argv[0] = "sed";
        argv[1] = "-i";
        argv[2] = "s/-A/-D/g;s/-I/-D/g";
        argv[3] = &buffer[0];
        argv[4] = NULL;
        if (!_eval(argv, NULL, 0, NULL))
        {
                argv[0] = &buffer[0];
                argv[1] = NULL;
                _eval(argv, NULL, 0, NULL);
        }
        vpnlog(VPN_LOG_EXTRA,"Done removing firewall rules.");

        // Stop the VPN server
        vpnlog(VPN_LOG_EXTRA,"Stopping OpenVPN server.");
        sprintf(&buffer[0], "vpnserver%d", serverNum);
        killall(&buffer[0], SIGTERM);
        vpnlog(VPN_LOG_EXTRA,"OpenVPN server stopped.");

        // NVRAM setting for device type could have changed, just try to remove both
        vpnlog(VPN_LOG_EXTRA,"Removing VPN device.");
        sprintf(&buffer[0], "openvpn --rmtun --dev tap%d", serverNum+SERVER_IF_START);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        _eval(argv, NULL, 0, NULL);

        sprintf(&buffer[0], "openvpn --rmtun --dev tun%d", serverNum+SERVER_IF_START);
        for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
        _eval(argv, NULL, 0, NULL);
        vpnlog(VPN_LOG_EXTRA,"VPN device removed.");

        modprobe_r("tun");

        if ( nvram_get_int("vpn_debug") <= VPN_LOG_EXTRA )
        {
                vpnlog(VPN_LOG_EXTRA,"Removing generated files.");
                // Delete all files for this server
                sprintf(&buffer[0], "rm -rf /etc/openvpn/server%d /etc/openvpn/fw/server%d-fw.sh /etc/openvpn/vpnserver%d",serverNum,serverNum,serverNum);
                for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
                _eval(argv, NULL, 0, NULL);

                // Attempt to remove directories.  Will fail if not empty
                rmdir("/etc/openvpn/fw");
                rmdir("/etc/openvpn");
                vpnlog(VPN_LOG_EXTRA,"Done removing generated files.");
        }

        // Force OpenVPN process to end.  If we don't do this then it doesn't actually exit until
        // all current queued service actions are run, including starting vpn back up (which
        // will bail since the process is still running
        vpnlog(VPN_LOG_EXTRA,"Killing OpenVPN client.");
        sprintf(&buffer[0], "vpnserver%d", serverNum);
        killall(&buffer[0], SIGKILL);
        vpnlog(VPN_LOG_EXTRA,"OpenVPN server killed.");

        vpnlog(VPN_LOG_INFO,"VPN GUI server backend stopped.");
}

void start_vpn_eas()
{
        char buffer[16], *cur;
        int nums[4], i;

        // Parse and start servers
        strlcpy(&buffer[0], nvram_safe_get("vpn_server_eas"), sizeof(buffer));
        if ( strlen(&buffer[0]) != 0 ) vpnlog(VPN_LOG_INFO, "Starting servers (eas): %s", &buffer[0]);
        i = 0;
        for( cur = strtok(&buffer[0],","); cur != NULL && i < 4; cur = strtok(NULL, ",")) { nums[i++] = atoi(cur); }
        nums[i] = 0;
        for( i = 0; nums[i] > 0; i++ )
        {
                sprintf(&buffer[0], "vpnserver%d", nums[i]);
                if ( pidof(&buffer[0]) >= 0 )
                {
                        vpnlog(VPN_LOG_INFO, "Stopping server %d (eas)", nums[i]);
                        stop_vpnserver(nums[i]);
                        return;
                }

                vpnlog(VPN_LOG_INFO, "Starting server %d (eas)", nums[i]);
                start_vpnserver(nums[i]);
        }

        // Parse and start clients
        strlcpy(&buffer[0], nvram_safe_get("vpn_client_eas"), sizeof(buffer));
        if ( strlen(&buffer[0]) != 0 ) vpnlog(VPN_LOG_INFO, "Starting clients (eas): %s", &buffer[0]);
        i = 0;
        for( cur = strtok(&buffer[0],","); cur != NULL && i < 4; cur = strtok(NULL, ",")) { nums[i++] = atoi(cur); }
        nums[i] = 0;
        for( i = 0; nums[i] > 0; i++ )
        {
                sprintf(&buffer[0], "vpnclient%d", nums[i]);
                if ( pidof(&buffer[0]) >= 0 )
                {
                        vpnlog(VPN_LOG_INFO, "Stopping client %d (eas)", nums[i]);
                        stop_vpnclient(nums[i]);
                        return;
                }

                vpnlog(VPN_LOG_INFO, "Starting client %d (eas)", nums[i]);
                start_vpnclient(nums[i]);
        }
}

void run_vpn_firewall_scripts()
{
        DIR *dir;
        struct dirent *file;
        char *fn;
        char *argv[3];

        if ( chdir("/etc/openvpn/fw") )
                return;

        dir = opendir("/etc/openvpn/fw");

        vpnlog(VPN_LOG_EXTRA,"Beginning all firewall scripts...");
        while ( (file = readdir(dir)) != NULL )
        {
                fn = file->d_name;
                if ( fn[0] == '.' )
                        continue;
                vpnlog(VPN_LOG_INFO,"Running firewall script: %s", fn);
                argv[0] = "/bin/sh";
                argv[1] = fn;
                argv[2] = NULL;
                _eval(argv, NULL, 0, NULL);
        }
        vpnlog(VPN_LOG_EXTRA,"Done with all firewall scripts...");

        closedir(dir);
}

void write_vpn_dnsmasq_config(FILE* f)
{
        char nv[16];
        char buf[24];
        char *pos, ch;
        int cur;
        DIR *dir;
        struct dirent *file;
        FILE *dnsf;

        strlcpy(&buf[0], nvram_safe_get("vpn_server_dns"), sizeof(buf));
        for ( pos = strtok(&buf[0],","); pos != NULL; pos=strtok(NULL, ",") )
        {
                cur = atoi(pos);
                if ( cur )
                {
                        vpnlog(VPN_LOG_EXTRA, "Adding server %d interface to dns config", cur);
                        snprintf(&nv[0], sizeof(nv), "vpn_server%d_if", cur);
                        fprintf(f, "interface=%s%d\n", nvram_safe_get(&nv[0]), SERVER_IF_START+cur);
                }
        }

        if ( (dir = opendir("/etc/openvpn/dns")) != NULL )
        {
                while ( (file = readdir(dir)) != NULL )
                {
                        if ( file->d_name[0] == '.' )
                                continue;

                        if ( sscanf(file->d_name, "client%d.resol%c", &cur, &ch) == 2 )
                        {
                                vpnlog(VPN_LOG_EXTRA, "Checking ADNS settings for client %d", cur);
                                snprintf(&buf[0], sizeof(buf), "vpn_client%d_adns", cur);
                                if ( nvram_get_int(&buf[0]) == 2 )
                                {
                                        vpnlog(VPN_LOG_INFO, "Adding strict-order to dnsmasq config for client %d", cur);
                                        fprintf(f, "strict-order\n");
                                        break;
                                }
                        }

                        if ( sscanf(file->d_name, "client%d.con%c", &cur, &ch) == 2 )
                        {
                                if ( (dnsf = fopen(file->d_name, "r")) != NULL )
                                {
                                        vpnlog(VPN_LOG_INFO, "Adding Dnsmasq config from %s", file->d_name);

                                        while( !feof(dnsf) )
                                        {
                                                ch = fgetc(dnsf);
                                                fputc(ch==EOF?'\n':ch, f);
                                        }

                                        fclose(dnsf);
                                }
                        }
                }
        }
}

int write_vpn_resolv(FILE* f)
{
        DIR *dir;
        struct dirent *file;
        char *fn, ch, num, buf[24];
        FILE *dnsf;
        int exclusive = 0;

        if ( chdir("/etc/openvpn/dns") )
                return 0;

        dir = opendir("/etc/openvpn/dns");

        vpnlog(VPN_LOG_EXTRA, "Adding DNS entries...");
        while ( (file = readdir(dir)) != NULL )
        {
                fn = file->d_name;

                if ( fn[0] == '.' )
                        continue;

                if ( sscanf(fn, "client%c.resol%c", &num, &ch) == 2 )
                {
                        if ( (dnsf = fopen(fn, "r")) == NULL )
                                continue;

                        vpnlog(VPN_LOG_INFO,"Adding DNS entries from %s", fn);

                        while( !feof(dnsf) )
                        {
                                ch = fgetc(dnsf);
                                fputc(ch==EOF?'\n':ch, f);
                        }

                        fclose(dnsf);

                        snprintf(&buf[0], sizeof(buf), "vpn_client%c_adns", num);
                        if ( nvram_get_int(&buf[0]) == 3 )
                                exclusive = 1;
                }
        }
        vpnlog(VPN_LOG_EXTRA, "Done with DNS entries...");

        closedir(dir);

        return exclusive;
}