root/src/router/services/networking/udhcpc.c

/*
 * udhcpc.c
 *
 * Copyright (C) 2007 Sebastian Gottschall <gottschall@dd-wrt.com>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Id:
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/route.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <sys/sysinfo.h>

#include <bcmnvram.h>
#include <netconf.h>
#include <shutils.h>
#include <rc.h>
#include <code_pattern.h>
#include <cy_conf.h>
#include <utils.h>
#include <services.h>

#define IFUP (IFF_UP | IFF_RUNNING | IFF_BROADCAST | IFF_MULTICAST)

static int expires(unsigned int in)
{
        struct sysinfo info;
        FILE *fp;

        sysinfo(&info);

        /*
         * Save uptime ranther than system time, because the system time may
         * change 
         */
        if (!(fp = fopen("/tmp/udhcpc.expires", "w"))) {
                perror("/tmp/udhcpd.expires");
                return errno;
        }
        fprintf(fp, "%d", (unsigned int)info.uptime + in);
        fclose(fp);
        return 0;
}

/*
 * deconfig: This argument is used when udhcpc starts, and when a
 * leases is lost. The script should put the interface in an up, but
 * deconfigured state.
 */
static int deconfig(void)
{
        char *wan_ifname = safe_getenv("interface");

        eval("ifconfig", wan_ifname, "0.0.0.0", "up");
        expires(0);

        nvram_set("wan_ipaddr", "0.0.0.0");
        nvram_set("wan_netmask", "0.0.0.0");
        nvram_set("wan_gateway", "0.0.0.0");
        nvram_set("wan_get_dns", "");
        // nvram_set("wan_wins","0.0.0.0"); // Don't care for linksys spec
        nvram_set("wan_lease", "0");

        unlink("/tmp/get_lease_time");
        unlink("/tmp/lease_time");

        cprintf("done\n");
        return 0;
}

// ==================================================================
static int update_value(void)
{

        char *value;
        int changed = 0;

        if ((value = getenv("ip"))) {
                chomp(value);
                if (nvram_invmatch("wan_ipaddr", value)) {
                        nvram_set("wan_ipaddr", value);
                        changed++;
                }
        }
        if ((value = getenv("subnet"))) {
                chomp(value);
                if (nvram_invmatch("wan_netmask", value)) {
                        nvram_set("wan_netmask", value);
                        changed++;
                }
        }
        if ((value = getenv("router"))) {
                chomp(value);
                if (nvram_invmatch("wan_gateway", value)) {
                        nvram_set("wan_gateway", value);
                        changed++;
                }
        }
        if ((value = getenv("dns"))) {
                chomp(value);
                if (nvram_invmatch("wan_get_dns", value)) {
                        nvram_set("wan_get_dns", value);
                        changed++;
                }
        }
        /*
         * if ((value = getenv("wins"))) nvram_set("wan_wins", value); if ((value 
         * = getenv("hostname"))) sethostname(value, strlen(value) + 1); 
         */
        if ((value = getenv("domain"))) {
                chomp(value);
                if (nvram_invmatch("wan_get_domain", value)) {
                        nvram_set("wan_get_domain", value);
                        changed++;
                }
        }
        if ((value = getenv("lease"))) {
                chomp(value);
                if (nvram_invmatch("wan_lease", value)) {
                        nvram_set("wan_lease", value);
                        changed++;
                }
                expires(atoi(value));
        }

        if (changed) {
                set_host_domain_name();
#ifdef HAVE_UDHCPD
                stop_udhcpd();
                start_udhcpd();
#endif
        }
        return 0;
}

// =================================================================

/*
 * bound: This argument is used when udhcpc moves from an unbound, to
 * a bound state. All of the paramaters are set in enviromental
 * variables, The script should configure the interface, and set any
 * other relavent parameters (default gateway, dns server, etc).
 */
#ifdef HAVE_HEARTBEAT
extern void start_heartbeat_boot(void);
#endif
static int bound(void)
{
        nvram_unset("dhcpc_done");
        char *wan_ifname = safe_getenv("interface");
        char *value;
        char temp_wan_ipaddr[16], temp_wan_netmask[16], temp_wan_gateway[16];
        int changed = 0;

        if ((value = getenv("ip"))) {
                chomp(value);
                if (nvram_match("wan_proto", "pptp")
                    && nvram_match("pptp_use_dhcp", "1"))
                        strcpy(temp_wan_ipaddr, value);
                else {
                        if (nvram_invmatch("wan_ipaddr", value))
                                changed = 1;
                }
                nvram_set("wan_ipaddr", value);
        }
        if ((value = getenv("subnet"))) {
                chomp(value);
                if (nvram_match("wan_proto", "pptp")
                    && nvram_match("pptp_use_dhcp", "1"))
                        strcpy(temp_wan_netmask, value);
                else {
                        if (nvram_invmatch("wan_netmask", value))
                                changed = 1;
                        nvram_set("wan_netmask", value);
                }
        }
        if ((value = getenv("router"))) {
                chomp(value);
                if (nvram_invmatch("wan_gateway", value))
                        changed = 1;
                nvram_set("wan_gateway", value);
        }
        if ((value = getenv("dns"))) {
                chomp(value);
                // if (nvram_invmatch("wan_get_dns",value))
                // changed=1; 
                nvram_set("wan_get_dns", value);
        }
        /*
         * Don't care for linksys spec if ((value = getenv("wins")))
         * nvram_set("wan_wins", value); if ((value = getenv("hostname")))
         * sethostname(value, strlen(value) + 1); 
         */
        if ((value = getenv("domain"))) {
                chomp(value);
                if (nvram_invmatch("wan_get_domain", value))
                        changed = 1;
                nvram_set("wan_get_domain", value);     // HeartBeat need to use
        }
        if ((value = getenv("lease"))) {
                chomp(value);
                nvram_set("wan_lease", value);
                expires(atoi(value));
        }
        if (!changed) {
                cprintf("interface hasnt changed, do nothing\n");
                return 0;
        }
        stop_firewall();
        cprintf("configure to IF[%s] , IP[%s], MASK[%s]\n", wan_ifname,
                nvram_safe_get("wan_ipaddr"), nvram_safe_get("wan_netmask"));

        if (nvram_match("wan_proto", "pptp")
            && nvram_match("pptp_use_dhcp", "1"))
                eval("ifconfig", wan_ifname, temp_wan_ipaddr, "netmask",
                     temp_wan_netmask, "up");
        else
                eval("ifconfig", wan_ifname, nvram_safe_get("wan_ipaddr"),
                     "netmask", nvram_safe_get("wan_netmask"), "up");

        /*
         * We only want to exec bellow functions after dhcp get ip if the
         * wan_proto is heartbeat 
         */
#ifdef HAVE_HEARTBEAT
        if (nvram_match("wan_proto", "heartbeat")) {
                int i = 0;

                /*
                 * Delete all default routes 
                 */
                while (route_del(wan_ifname, 0, NULL, NULL, NULL) == 0
                       || i++ < 10) ;

                /*
                 * Set default route to gateway if specified 
                 */
                route_add(wan_ifname, 0, "0.0.0.0",
                          nvram_safe_get("wan_gateway"), "0.0.0.0");

                /*
                 * save dns to resolv.conf 
                 */
                dns_to_resolv();
                stop_udhcpd();
                start_udhcpd();
                start_firewall();
                stop_wland();
                start_wshaper();
                start_wland();
                start_heartbeat_boot();
        }
#else
        if (0) {
                // nothing
        }
#endif
#ifdef HAVE_PPTP
        else if (nvram_match("wan_proto", "pptp")
                 && nvram_match("pptp_use_dhcp", "1")) {
                char pptpip[64];
                struct dns_lists *dns_list = NULL;

                dns_to_resolv();

                dns_list = get_dns_list();
                int i = 0;

                if (dns_list) {
                        for (i = 0; i < dns_list->num_servers; i++)
                                route_add(wan_ifname, 0,
                                          dns_list->dns_server[i],
                                          nvram_safe_get("wan_gateway"),
                                          "255.255.255.255");
                        free(dns_list);
                }
                route_add(wan_ifname, 0, "0.0.0.0",
                          nvram_safe_get("wan_gateway"), "0.0.0.0");

                nvram_set("wan_gateway_buf", nvram_get("wan_gateway"));

                getIPFromName(nvram_safe_get("pptp_server_name"), pptpip);
                nvram_set("pptp_server_ip", pptpip);

                // Add the route to the PPTP server on the wan interface for pptp
                // client to reach it
                if (nvram_match("wan_gateway", "0.0.0.0")
                    || nvram_match("wan_netmask", "0.0.0.0"))
                        route_add(wan_ifname, 0,
                                  nvram_safe_get("pptp_server_ip"),
                                  nvram_safe_get("wan_gateway"),
                                  "255.255.255.255");
                else
                        route_add(wan_ifname, 0,
                                  nvram_safe_get("pptp_server_ip"),
                                  nvram_safe_get("wan_gateway"),
                                  nvram_safe_get("wan_netmask"));

        }
#endif
#ifdef HAVE_L2TP
        else if (nvram_match("wan_proto", "l2tp")) {
                int i = 0;

                /*
                 * Delete all default routes 
                 */
                while (route_del(wan_ifname, 0, NULL, NULL, NULL) == 0
                       || i++ < 10) ;

                /*
                 * Set default route to gateway if specified 
                 */
                route_add(wan_ifname, 0, "0.0.0.0",
                          nvram_safe_get("wan_gateway"), "0.0.0.0");

                /*
                 * Backup the default gateway. It should be used if L2TP connection
                 * is broken 
                 */
                nvram_set("wan_gateway_buf", nvram_get("wan_gateway"));

                /*
                 * clear dns from the resolv.conf 
                 */
                nvram_set("wan_get_dns", "");
                dns_to_resolv();
                start_firewall();
                start_l2tp_boot();
        }
#endif
        else {
                cprintf("start wan done\n");
                start_wan_done(wan_ifname);
        }
        nvram_set("dhcpc_done", "1");
        cprintf("done\n");
        return 0;
}

/*
 * renew: This argument is used when a DHCP lease is renewed. All of
 * the paramaters are set in enviromental variables. This argument is
 * used when the interface is already configured, so the IP address,
 * will not change, however, the other DHCP paramaters, such as the
 * default gateway, subnet mask, and dns server may change.
 */
static int renew(void)
{
        bound();

        cprintf("done\n");
        return 0;
}

int udhcpc_main(int argc, char **argv)
{
        if (check_action() != ACT_IDLE)
                return -1;

        if (!argv[1])
                return EINVAL;
        else if (strstr(argv[1], "deconfig"))
                return deconfig();
        else if (strstr(argv[1], "bound"))
                return bound();
        else if (strstr(argv[1], "renew"))
                return renew();
        else if (strstr(argv[1], "update"))
                return update_value();
        else
                return EINVAL;
}

static int bound_tv(void)
{
        char *ifname = safe_getenv("interface");
        char *ip = safe_getenv("ip");
        char *net = safe_getenv("subnet");
        char *cidr = safe_getenv("cidrroute");
        if (ip && net && ifname) {
                char bcast[32];
                strcpy(bcast, ip);
                get_broadcast(bcast, net);
                eval("ifconfig", ifname, ip, "netmask", net, "broadcast", bcast,
                     "multi");
        }
        if (cidr && ifname) {
                char *callbuffer = malloc(strlen(cidr) + 128);
                sprintf(callbuffer,
                        "export cidrroute=\"%s\";export interface=\"%s\";/etc/cidrroute.sh",
                        cidr, ifname);
                system(callbuffer);
                free(callbuffer);
        }
        return 0;
}

int udhcpc_tv_main(int argc, char **argv)
{
        if (check_action() != ACT_IDLE)
                return -1;

        if (!argv[1])
                return EINVAL;
        else if (strstr(argv[1], "deconfig"))
                return 0;
        else if (strstr(argv[1], "bound"))
                return bound_tv();
        else if (strstr(argv[1], "renew"))
                return bound_tv();
        else if (strstr(argv[1], "update"))
                return bound_tv();
        else
                return EINVAL;
}