| 1 | /* |
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| 2 | * udhcpd.c |
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| 3 | * |
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| 4 | * Copyright (C) 2007 Sebastian Gottschall <gottschall@dd-wrt.com> |
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| 5 | * |
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| 6 | * This program is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU General Public License |
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| 8 | * as published by the Free Software Foundation; either version 2 |
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| 9 | * of the License. |
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| 10 | * |
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| 11 | * This program is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | * GNU General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU General Public License |
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| 17 | * along with this program; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 19 | * |
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| 20 | * $Id: |
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| 21 | */ |
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| 22 | #ifdef HAVE_UDHCPD |
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| 23 | #include <unistd.h> |
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| 24 | #include <stdio.h> |
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| 25 | #include <stdlib.h> |
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| 26 | #include <string.h> |
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| 27 | #include <errno.h> |
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| 28 | #include <sys/time.h> |
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| 29 | #include <sys/types.h> |
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| 30 | #include <sys/stat.h> |
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| 31 | #include <syslog.h> |
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| 32 | #include <signal.h> |
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| 33 | #include <netinet/in.h> |
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| 34 | #include <arpa/inet.h> |
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| 35 | #include <utils.h> |
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| 36 | #include <bcmnvram.h> |
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| 37 | #include <shutils.h> |
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| 38 | |
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| 39 | extern int usejffs; |
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| 40 | |
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| 41 | void stop_udhcpd( void ); |
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| 42 | extern void addHost( char *host, char *ip ); |
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| 43 | |
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| 44 | static int adjust_dhcp_range( void ) |
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| 45 | { |
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| 46 | struct in_addr ipaddr, netaddr, netmask; |
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| 47 | |
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| 48 | char *lan_ipaddr = nvram_safe_get( "lan_ipaddr" ); |
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| 49 | char *lan_netmask = nvram_safe_get( "lan_netmask" ); |
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| 50 | char *dhcp_num = nvram_safe_get( "dhcp_num" ); |
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| 51 | char *dhcp_start = nvram_safe_get( "dhcp_start" ); |
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| 52 | |
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| 53 | int legal_start_ip, legal_end_ip, legal_total_ip, dhcp_start_ip; |
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| 54 | int set_dhcp_start_ip = 0, set_dhcp_num = 0; |
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| 55 | int adjust_ip = 0, adjust_num = 0; |
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| 56 | |
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| 57 | inet_aton( lan_ipaddr, &netaddr ); |
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| 58 | inet_aton( lan_netmask, &netmask ); |
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| 59 | inet_aton( dhcp_start, &ipaddr ); |
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| 60 | |
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| 61 | legal_total_ip = 254 - get_single_ip( lan_netmask, 3 ); |
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| 62 | legal_start_ip = |
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| 63 | ( get_single_ip( lan_ipaddr, 3 ) & get_single_ip( lan_netmask, 3 ) ) + |
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| 64 | 1; |
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| 65 | legal_end_ip = legal_start_ip + legal_total_ip - 1; |
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| 66 | dhcp_start_ip = atoi( dhcp_start ); |
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| 67 | |
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| 68 | cprintf |
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| 69 | ( "legal_total_ip=[%d] legal_start_ip=[%d] legal_end_ip=[%d] dhcp_start_ip=[%d]\n", |
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| 70 | legal_total_ip, legal_start_ip, legal_end_ip, dhcp_start_ip ); |
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| 71 | |
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| 72 | if( ( dhcp_start_ip > legal_end_ip ) |
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| 73 | || ( dhcp_start_ip < legal_start_ip ) ) |
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| 74 | { |
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| 75 | cprintf |
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| 76 | ( "Illegal DHCP Start IP: We need to adjust DHCP Start ip.\n" ); |
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| 77 | set_dhcp_start_ip = legal_start_ip; |
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| 78 | adjust_ip = 1; |
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| 79 | if( atoi( dhcp_num ) > legal_total_ip ) |
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| 80 | { |
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| 81 | cprintf( "DHCP num is exceed, we need to adjust." ); |
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| 82 | set_dhcp_num = legal_total_ip; |
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| 83 | adjust_num = 1; |
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| 84 | } |
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| 85 | } |
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| 86 | else |
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| 87 | { |
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| 88 | cprintf( "Legal DHCP Start IP: We need to check DHCP num.\n" ); |
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| 89 | if( ( atoi( dhcp_num ) + dhcp_start_ip ) > legal_end_ip ) |
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| 90 | { |
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| 91 | cprintf( "DHCP num is exceed, we need to adjust.\n" ); |
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| 92 | set_dhcp_num = legal_end_ip - dhcp_start_ip + 1; |
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| 93 | adjust_num = 1; |
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| 94 | } |
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| 95 | } |
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| 96 | |
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| 97 | if( adjust_ip ) |
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| 98 | { |
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| 99 | char ip[20]; |
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| 100 | |
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| 101 | cprintf( "set_dhcp_start_ip=[%d]\n", set_dhcp_start_ip ); |
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| 102 | snprintf( ip, sizeof( ip ), "%d", set_dhcp_start_ip ); |
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| 103 | nvram_set( "dhcp_start", ip ); |
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| 104 | } |
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| 105 | if( adjust_num ) |
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| 106 | { |
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| 107 | char num[5]; |
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| 108 | |
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| 109 | cprintf( "set_dhcp_num=[%d]\n", set_dhcp_num ); |
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| 110 | snprintf( num, sizeof( num ), "%d", set_dhcp_num ); |
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| 111 | nvram_set( "dhcp_num", num ); |
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| 112 | } |
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| 113 | |
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| 114 | return 1; |
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| 115 | } |
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| 116 | |
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| 117 | void start_udhcpd( void ) |
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| 118 | { |
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| 119 | FILE *fp = NULL; |
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| 120 | struct dns_lists *dns_list = NULL; |
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| 121 | int i = 0; |
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| 122 | |
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| 123 | if( nvram_match( "dhcpfwd_enable", "1" ) ) |
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| 124 | { |
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| 125 | return; |
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| 126 | } |
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| 127 | #ifndef HAVE_RB500 |
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| 128 | #ifndef HAVE_XSCALE |
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| 129 | if( nvram_match( "wl0_mode", "wet" ) || nvram_match( "wl0_mode", "apstawet" ) ) // dont |
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| 130 | // start |
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| 131 | // any |
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| 132 | // dhcp |
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| 133 | // services |
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| 134 | // in |
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| 135 | // bridge |
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| 136 | // mode |
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| 137 | { |
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| 138 | nvram_set( "lan_proto", "static" ); |
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| 139 | return; |
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| 140 | } |
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| 141 | #endif |
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| 142 | #endif |
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| 143 | |
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| 144 | if( nvram_invmatch( "lan_proto", "dhcp" ) |
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| 145 | || nvram_match( "dhcp_dnsmasq", "1" ) ) |
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| 146 | { |
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| 147 | stop_udhcpd( ); |
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| 148 | return; |
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| 149 | } |
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| 150 | |
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| 151 | /* |
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| 152 | * Automatically adjust DHCP Start IP and num when LAN IP or netmask is |
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| 153 | * changed |
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| 154 | */ |
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| 155 | adjust_dhcp_range( ); |
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| 156 | |
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| 157 | cprintf( "%s %d.%d.%d.%s %s %s\n", |
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| 158 | nvram_safe_get( "lan_ifname" ), |
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| 159 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 0 ), |
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| 160 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 1 ), |
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| 161 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 2 ), |
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| 162 | nvram_safe_get( "dhcp_start" ), |
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| 163 | nvram_safe_get( "dhcp_end" ), nvram_safe_get( "lan_lease" ) ); |
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| 164 | |
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| 165 | /* |
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| 166 | * Touch leases file |
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| 167 | */ |
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| 168 | |
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| 169 | usejffs = 0; |
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| 170 | |
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| 171 | if( nvram_match( "dhcpd_usejffs", "1" ) ) |
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| 172 | { |
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| 173 | if( !( fp = fopen( "/jffs/udhcpd.leases", "a" ) ) ) |
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| 174 | { |
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| 175 | usejffs = 0; |
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| 176 | } |
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| 177 | else |
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| 178 | { |
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| 179 | usejffs = 1; |
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| 180 | } |
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| 181 | } |
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| 182 | if( !usejffs ) |
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| 183 | { |
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| 184 | if( !( fp = fopen( "/tmp/udhcpd.leases", "a" ) ) ) |
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| 185 | { |
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| 186 | perror( "/tmp/udhcpd.leases" ); |
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| 187 | return; |
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| 188 | } |
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| 189 | } |
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| 190 | fclose( fp ); |
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| 191 | |
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| 192 | /* |
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| 193 | * Write configuration file based on current information |
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| 194 | */ |
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| 195 | if( !( fp = fopen( "/tmp/udhcpd.conf", "w" ) ) ) |
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| 196 | { |
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| 197 | perror( "/tmp/udhcpd.conf" ); |
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| 198 | return; |
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| 199 | } |
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| 200 | fprintf( fp, "pidfile /var/run/udhcpd.pid\n" ); |
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| 201 | fprintf( fp, "start %d.%d.%d.%s\n", |
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| 202 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 0 ), |
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| 203 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 1 ), |
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| 204 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 2 ), |
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| 205 | nvram_safe_get( "dhcp_start" ) ); |
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| 206 | fprintf( fp, "end %d.%d.%d.%d\n", |
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| 207 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 0 ), |
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| 208 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 1 ), |
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| 209 | get_single_ip( nvram_safe_get( "lan_ipaddr" ), 2 ), |
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| 210 | atoi( nvram_safe_get( "dhcp_start" ) ) + |
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| 211 | atoi( nvram_safe_get( "dhcp_num" ) ) - 1 ); |
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| 212 | int dhcp_max = |
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| 213 | atoi( nvram_safe_get( "dhcp_num" ) ) + |
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| 214 | atoi( nvram_safe_get( "static_leasenum" ) ); |
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| 215 | fprintf( fp, "max_leases %d\n", dhcp_max ); |
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| 216 | fprintf( fp, "interface %s\n", nvram_safe_get( "lan_ifname" ) ); |
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| 217 | fprintf( fp, "remaining yes\n" ); |
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| 218 | fprintf( fp, "auto_time 30\n" ); // N seconds to update lease table |
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| 219 | if( usejffs ) |
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| 220 | fprintf( fp, "lease_file /jffs/udhcpd.leases\n" ); |
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| 221 | else |
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| 222 | fprintf( fp, "lease_file /tmp/udhcpd.leases\n" ); |
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| 223 | fprintf( fp, "statics_file /tmp/udhcpd.statics\n" ); |
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| 224 | |
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| 225 | if( nvram_invmatch( "lan_netmask", "" ) |
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| 226 | && nvram_invmatch( "lan_netmask", "0.0.0.0" ) ) |
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| 227 | fprintf( fp, "option subnet %s\n", nvram_safe_get( "lan_netmask" ) ); |
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| 228 | |
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| 229 | if( nvram_invmatch( "dhcp_gateway", "" ) |
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| 230 | && nvram_invmatch( "dhcp_gateway", "0.0.0.0" ) ) |
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| 231 | fprintf( fp, "option router %s\n", nvram_safe_get( "dhcp_gateway" ) ); |
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| 232 | else if( nvram_invmatch( "lan_ipaddr", "" ) |
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| 233 | && nvram_invmatch( "lan_ipaddr", "0.0.0.0" ) ) |
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| 234 | fprintf( fp, "option router %s\n", nvram_safe_get( "lan_ipaddr" ) ); |
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| 235 | |
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| 236 | if( nvram_invmatch( "wan_wins", "" ) |
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| 237 | && nvram_invmatch( "wan_wins", "0.0.0.0" ) ) |
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| 238 | fprintf( fp, "option wins %s\n", nvram_get( "wan_wins" ) ); |
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| 239 | |
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| 240 | // Wolf add - keep lease within reasonable timeframe |
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| 241 | if( atoi( nvram_safe_get( "dhcp_lease" ) ) < 10 ) |
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| 242 | { |
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| 243 | nvram_set( "dhcp_lease", "10" ); |
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| 244 | nvram_commit( ); |
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| 245 | } |
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| 246 | if( atoi( nvram_safe_get( "dhcp_lease" ) ) > 5760 ) |
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| 247 | { |
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| 248 | nvram_set( "dhcp_lease", "5760" ); |
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| 249 | nvram_commit( ); |
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| 250 | } |
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| 251 | |
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| 252 | fprintf( fp, "option lease %d\n", |
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| 253 | atoi( nvram_safe_get( "dhcp_lease" ) ) ? |
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| 254 | atoi( nvram_safe_get( "dhcp_lease" ) ) * 60 : 86400 ); |
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| 255 | |
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| 256 | dns_list = get_dns_list( ); |
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| 257 | |
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| 258 | if( !dns_list || dns_list->num_servers == 0 ) |
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| 259 | { |
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| 260 | if( nvram_invmatch( "lan_ipaddr", "" ) ) |
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| 261 | fprintf( fp, "option dns %s\n", nvram_safe_get( "lan_ipaddr" ) ); |
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| 262 | } |
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| 263 | else if( nvram_match( "local_dns", "1" ) ) |
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| 264 | { |
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| 265 | if( dns_list |
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| 266 | && ( nvram_invmatch( "lan_ipaddr", "" ) |
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| 267 | || strlen( dns_list->dns_server[0] ) > 0 |
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| 268 | || strlen( dns_list->dns_server[1] ) > 0 |
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| 269 | || strlen( dns_list->dns_server[2] ) > 0 ) ) |
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| 270 | { |
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| 271 | fprintf( fp, "option dns" ); |
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| 272 | |
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| 273 | if( nvram_invmatch( "lan_ipaddr", "" ) ) |
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| 274 | fprintf( fp, " %s", nvram_safe_get( "lan_ipaddr" ) ); |
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| 275 | if( strlen( dns_list->dns_server[0] ) > 0 ) |
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| 276 | fprintf( fp, " %s", dns_list->dns_server[0] ); |
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| 277 | if( strlen( dns_list->dns_server[1] ) > 0 ) |
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| 278 | fprintf( fp, " %s", dns_list->dns_server[1] ); |
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| 279 | if( strlen( dns_list->dns_server[2] ) > 0 ) |
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| 280 | fprintf( fp, " %s", dns_list->dns_server[2] ); |
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| 281 | |
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| 282 | fprintf( fp, "\n" ); |
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| 283 | } |
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| 284 | } |
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| 285 | else |
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| 286 | { |
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| 287 | if( dns_list |
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| 288 | && ( strlen( dns_list->dns_server[0] ) > 0 |
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| 289 | || strlen( dns_list->dns_server[1] ) > 0 |
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| 290 | || strlen( dns_list->dns_server[2] ) > 0 ) ) |
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| 291 | { |
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| 292 | fprintf( fp, "option dns" ); |
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| 293 | if( strlen( dns_list->dns_server[0] ) > 0 ) |
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| 294 | fprintf( fp, " %s", dns_list->dns_server[0] ); |
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| 295 | if( strlen( dns_list->dns_server[1] ) > 0 ) |
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| 296 | fprintf( fp, " %s", dns_list->dns_server[1] ); |
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| 297 | if( strlen( dns_list->dns_server[2] ) > 0 ) |
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| 298 | fprintf( fp, " %s", dns_list->dns_server[2] ); |
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| 299 | |
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| 300 | fprintf( fp, "\n" ); |
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| 301 | } |
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| 302 | } |
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| 303 | |
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| 304 | if( dns_list ) |
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| 305 | free( dns_list ); |
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| 306 | |
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| 307 | /* |
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| 308 | * DHCP Domain |
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| 309 | */ |
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| 310 | if( nvram_match( "dhcp_domain", "wan" ) ) |
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| 311 | { |
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| 312 | if( nvram_invmatch( "wan_domain", "" ) ) |
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| 313 | fprintf( fp, "option domain %s\n", |
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| 314 | nvram_safe_get( "wan_domain" ) ); |
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| 315 | else if( nvram_invmatch( "wan_get_domain", "" ) ) |
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| 316 | fprintf( fp, "option domain %s\n", |
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| 317 | nvram_safe_get( "wan_get_domain" ) ); |
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| 318 | } |
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| 319 | else |
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| 320 | { |
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| 321 | if( nvram_invmatch( "lan_domain", "" ) ) |
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| 322 | fprintf( fp, "option domain %s\n", |
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| 323 | nvram_safe_get( "lan_domain" ) ); |
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| 324 | } |
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| 325 | |
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| 326 | if( nvram_invmatch( "dhcpd_options", "" ) ) |
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| 327 | { |
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| 328 | fwritenvram( "dhcpd_options", fp ); |
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| 329 | } |
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| 330 | fclose( fp ); |
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| 331 | |
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| 332 | /* |
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| 333 | * Sveasoft addition - create static leases file |
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| 334 | */ |
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| 335 | // Static for router |
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| 336 | if( !( fp = fopen( "/tmp/udhcpd.statics", "w" ) ) ) |
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| 337 | { |
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| 338 | perror( "/tmp/udhcpd.statics" ); |
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| 339 | return; |
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| 340 | } |
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| 341 | |
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| 342 | if( nvram_match( "local_dns", "1" ) ) |
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| 343 | { |
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| 344 | if( nvram_match( "port_swap", "1" ) ) |
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| 345 | fprintf( fp, "%s %s %s\n", nvram_safe_get( "lan_ipaddr" ), |
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| 346 | nvram_safe_get( "et1macaddr" ), |
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| 347 | nvram_safe_get( "router_name" ) ); |
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| 348 | else |
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| 349 | fprintf( fp, "%s %s %s\n", nvram_safe_get( "lan_ipaddr" ), |
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| 350 | nvram_safe_get( "et0macaddr" ), |
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| 351 | nvram_safe_get( "router_name" ) ); |
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| 352 | } |
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| 353 | int leasenum = atoi( nvram_safe_get( "static_leasenum" ) ); |
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| 354 | |
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| 355 | if( leasenum > 0 ) |
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| 356 | { |
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| 357 | char *lease = nvram_safe_get( "static_leases" ); |
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| 358 | char *leasebuf = ( char * )malloc( strlen( lease ) + 1 ); |
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| 359 | char *cp = leasebuf; |
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| 360 | |
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| 361 | strcpy( leasebuf, lease ); |
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| 362 | for( i = 0; i < leasenum; i++ ) |
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| 363 | { |
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| 364 | char *mac = strsep( &leasebuf, "=" ); |
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| 365 | char *host = strsep( &leasebuf, "=" ); |
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| 366 | char *ip = strsep( &leasebuf, " " ); |
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| 367 | |
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| 368 | if( mac == NULL || host == NULL || ip == NULL ) |
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| 369 | continue; |
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| 370 | fprintf( fp, "%s %s %s\n", ip, mac, host ); |
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| 371 | addHost( host, ip ); |
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| 372 | } |
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| 373 | free( cp ); |
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| 374 | } |
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| 375 | |
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| 376 | fclose( fp ); |
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| 377 | /* |
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| 378 | * end Sveasoft addition |
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| 379 | */ |
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| 380 | |
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| 381 | dns_to_resolv( ); |
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| 382 | |
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| 383 | eval( "udhcpd", "/tmp/udhcpd.conf" ); |
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| 384 | dd_syslog( LOG_INFO, "udhcpd : udhcp daemon successfully started\n" ); |
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| 385 | |
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| 386 | /* |
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| 387 | * Dump static leases to udhcpd.leases so they can be read by dnsmasq |
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| 388 | */ |
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| 389 | /* |
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| 390 | * DD-WRT (belanger) : the dump database is now handled directly in |
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| 391 | * udhcpd |
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| 392 | */ |
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| 393 | // sprintf (sigusr1, "-%d", SIGUSR1); |
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| 394 | // killps("udhcpd",sigusr1); |
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| 395 | |
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| 396 | // eval ("killall", sigusr1, "udhcpd"); |
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| 397 | |
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| 398 | cprintf( "done\n" ); |
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| 399 | return; |
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| 400 | } |
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| 401 | |
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| 402 | void stop_udhcpd( void ) |
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| 403 | { |
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| 404 | if( pidof( "udhcpd" ) > 0 ) |
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| 405 | { |
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| 406 | dd_syslog( LOG_INFO, "udhcpd : udhcp daemon successfully stopped\n" ); |
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| 407 | softkill( "udhcpd" ); |
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| 408 | } |
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| 409 | cprintf( "done\n" ); |
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| 410 | return; |
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| 411 | } |
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| 412 | |
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| 413 | #endif |
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