"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 2 | /* dhcpd.c |
| 3 | * |
| 4 | * udhcp Server |
| 5 | * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au> |
| 6 | * Chris Trew <ctrew@moreton.com.au> |
| 7 | * |
| 8 | * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001 |
| 9 | * |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 11 | */ |
| 12 | |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 13 | #include <syslog.h> |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 14 | #include "common.h" |
Denis Vlasenko | d55fe3e | 2008-02-04 13:12:16 +0000 | [diff] [blame] | 15 | #include "dhcpc.h" |
Denis Vlasenko | 5a3395b | 2006-11-18 19:51:32 +0000 | [diff] [blame] | 16 | #include "dhcpd.h" |
| 17 | #include "options.h" |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 18 | |
| 19 | |
| 20 | /* globals */ |
| 21 | struct dhcpOfferedAddr *leases; |
Denis Vlasenko | deabacd | 2007-09-30 17:55:43 +0000 | [diff] [blame] | 22 | /* struct server_config_t server_config is in bb_common_bufsiz1 */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 23 | |
| 24 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 25 | int udhcpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 26 | int udhcpd_main(int argc UNUSED_PARAM, char **argv) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 27 | { |
| 28 | fd_set rfds; |
Denis Vlasenko | 0416e3d | 2009-01-01 17:52:09 +0000 | [diff] [blame] | 29 | int server_socket = -1, retval, max_sock; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 30 | struct dhcpMessage packet; |
Rob Landley | 9ffd423 | 2006-05-21 18:30:35 +0000 | [diff] [blame] | 31 | uint8_t *state, *server_id, *requested; |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 32 | uint32_t server_id_aligned = server_id_aligned; /* for compiler */ |
| 33 | uint32_t requested_aligned = requested_aligned; |
| 34 | uint32_t static_lease_ip; |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 35 | unsigned timeout_end; |
| 36 | unsigned num_ips; |
Denis Vlasenko | 3d17d2b | 2007-08-14 16:45:29 +0000 | [diff] [blame] | 37 | unsigned opt; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 38 | struct option_set *option; |
Rob Landley | 9ffd423 | 2006-05-21 18:30:35 +0000 | [diff] [blame] | 39 | struct dhcpOfferedAddr *lease, static_lease; |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 40 | IF_FEATURE_UDHCP_PORT(char *str_P;) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 41 | |
Denis Vlasenko | d55fe3e | 2008-02-04 13:12:16 +0000 | [diff] [blame] | 42 | #if ENABLE_FEATURE_UDHCP_PORT |
| 43 | SERVER_PORT = 67; |
| 44 | CLIENT_PORT = 68; |
| 45 | #endif |
| 46 | |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 47 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 |
| 48 | opt_complementary = "vv"; |
| 49 | #endif |
| 50 | opt = getopt32(argv, "fSv" |
| 51 | IF_FEATURE_UDHCP_PORT("P:", &str_P) |
| 52 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 |
| 53 | , &dhcp_verbose |
| 54 | #endif |
| 55 | ); |
Denis Vlasenko | 9f7b92a | 2007-08-15 20:03:36 +0000 | [diff] [blame] | 56 | argv += optind; |
Denis Vlasenko | 3d17d2b | 2007-08-14 16:45:29 +0000 | [diff] [blame] | 57 | if (!(opt & 1)) { /* no -f */ |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 58 | bb_daemonize_or_rexec(0, argv); |
Denis Vlasenko | a19e649 | 2009-03-11 14:40:00 +0000 | [diff] [blame] | 59 | logmode = LOGMODE_NONE; |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 60 | } |
Denis Vlasenko | 3d17d2b | 2007-08-14 16:45:29 +0000 | [diff] [blame] | 61 | if (opt & 2) { /* -S */ |
Denis Vlasenko | 5e4fda0 | 2009-03-08 23:46:48 +0000 | [diff] [blame] | 62 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 63 | logmode |= LOGMODE_SYSLOG; |
| 64 | } |
Denis Vlasenko | d55fe3e | 2008-02-04 13:12:16 +0000 | [diff] [blame] | 65 | #if ENABLE_FEATURE_UDHCP_PORT |
| 66 | if (opt & 4) { /* -P */ |
| 67 | SERVER_PORT = xatou16(str_P); |
| 68 | CLIENT_PORT = SERVER_PORT + 1; |
| 69 | } |
| 70 | #endif |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 71 | /* Would rather not do read_config before daemonization - |
| 72 | * otherwise NOMMU machines will parse config twice */ |
Denis Vlasenko | 9f7b92a | 2007-08-15 20:03:36 +0000 | [diff] [blame] | 73 | read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 74 | |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 75 | /* Make sure fd 0,1,2 are open */ |
| 76 | bb_sanitize_stdio(); |
| 77 | /* Equivalent of doing a fflush after every \n */ |
| 78 | setlinebuf(stdout); |
| 79 | |
| 80 | /* Create pidfile */ |
| 81 | write_pidfile(server_config.pidfile); |
| 82 | /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */ |
| 83 | |
Denis Vlasenko | def8898 | 2007-10-07 17:06:01 +0000 | [diff] [blame] | 84 | bb_info_msg("%s (v"BB_VER") started", applet_name); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 85 | |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 86 | option = find_option(server_config.options, DHCP_LEASE_TIME); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 87 | server_config.lease = LEASE_TIME; |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 88 | if (option) { |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 89 | move_from_unaligned32(server_config.lease, option->data + 2); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 90 | server_config.lease = ntohl(server_config.lease); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 91 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 92 | |
| 93 | /* Sanity check */ |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 94 | num_ips = server_config.end_ip - server_config.start_ip + 1; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 95 | if (server_config.max_leases > num_ips) { |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 96 | bb_error_msg("max_leases=%u is too big, setting to %u", |
| 97 | (unsigned)server_config.max_leases, num_ips); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 98 | server_config.max_leases = num_ips; |
| 99 | } |
| 100 | |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 101 | leases = xzalloc(server_config.max_leases * sizeof(*leases)); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 102 | read_leases(server_config.lease_file); |
| 103 | |
Denys Vlasenko | 26918dd | 2009-06-16 12:04:23 +0200 | [diff] [blame] | 104 | if (udhcp_read_interface(server_config.interface, |
| 105 | &server_config.ifindex, |
| 106 | &server_config.server_nip, |
| 107 | server_config.server_mac) |
| 108 | ) { |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 109 | retval = 1; |
| 110 | goto ret; |
| 111 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 112 | |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 113 | /* Setup the signal pipe */ |
| 114 | udhcp_sp_setup(); |
| 115 | |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 116 | timeout_end = monotonic_sec() + server_config.auto_time; |
Denis Vlasenko | 5a3395b | 2006-11-18 19:51:32 +0000 | [diff] [blame] | 117 | while (1) { /* loop until universe collapses */ |
Denis Vlasenko | 0416e3d | 2009-01-01 17:52:09 +0000 | [diff] [blame] | 118 | int bytes; |
| 119 | struct timeval tv; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 120 | |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 121 | if (server_socket < 0) { |
Denis Vlasenko | f1980f6 | 2008-09-26 09:34:59 +0000 | [diff] [blame] | 122 | server_socket = udhcp_listen_socket(/*INADDR_ANY,*/ SERVER_PORT, |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 123 | server_config.interface); |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 124 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 125 | |
| 126 | max_sock = udhcp_sp_fd_set(&rfds, server_socket); |
| 127 | if (server_config.auto_time) { |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 128 | tv.tv_sec = timeout_end - monotonic_sec(); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 129 | tv.tv_usec = 0; |
| 130 | } |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 131 | retval = 0; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 132 | if (!server_config.auto_time || tv.tv_sec > 0) { |
| 133 | retval = select(max_sock + 1, &rfds, NULL, NULL, |
| 134 | server_config.auto_time ? &tv : NULL); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 135 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 136 | if (retval == 0) { |
| 137 | write_leases(); |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 138 | timeout_end = monotonic_sec() + server_config.auto_time; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 139 | continue; |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 140 | } |
| 141 | if (retval < 0 && errno != EINTR) { |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 142 | log1("Error on select"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 143 | continue; |
| 144 | } |
| 145 | |
| 146 | switch (udhcp_sp_read(&rfds)) { |
| 147 | case SIGUSR1: |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 148 | bb_info_msg("Received a SIGUSR1"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 149 | write_leases(); |
| 150 | /* why not just reset the timeout, eh */ |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 151 | timeout_end = monotonic_sec() + server_config.auto_time; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 152 | continue; |
| 153 | case SIGTERM: |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 154 | bb_info_msg("Received a SIGTERM"); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 155 | goto ret0; |
Denis Vlasenko | 0416e3d | 2009-01-01 17:52:09 +0000 | [diff] [blame] | 156 | case 0: /* no signal: read a packet */ |
| 157 | break; |
| 158 | default: /* signal or error (probably EINTR): back to select */ |
| 159 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 160 | } |
| 161 | |
Denis Vlasenko | 0416e3d | 2009-01-01 17:52:09 +0000 | [diff] [blame] | 162 | bytes = udhcp_recv_kernel_packet(&packet, server_socket); |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 163 | if (bytes < 0) { |
Denis Vlasenko | 0416e3d | 2009-01-01 17:52:09 +0000 | [diff] [blame] | 164 | /* bytes can also be -2 ("bad packet data") */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 165 | if (bytes == -1 && errno != EINTR) { |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 166 | log1("Read error: %s, reopening socket", strerror(errno)); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 167 | close(server_socket); |
| 168 | server_socket = -1; |
| 169 | } |
| 170 | continue; |
| 171 | } |
| 172 | |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 173 | state = get_option(&packet, DHCP_MESSAGE_TYPE); |
| 174 | if (state == NULL) { |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 175 | bb_error_msg("no message type option, ignoring packet"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 176 | continue; |
| 177 | } |
| 178 | |
| 179 | /* Look for a static lease */ |
Denys Vlasenko | cab3a01 | 2009-06-16 12:03:12 +0200 | [diff] [blame] | 180 | static_lease_ip = get_static_nip_by_mac(server_config.static_leases, &packet.chaddr); |
Denis Vlasenko | 5a3395b | 2006-11-18 19:51:32 +0000 | [diff] [blame] | 181 | if (static_lease_ip) { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 182 | bb_info_msg("Found static lease: %x", static_lease_ip); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 183 | |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 184 | memcpy(&static_lease.lease_mac16, &packet.chaddr, 16); |
| 185 | static_lease.lease_nip = static_lease_ip; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 186 | static_lease.expires = 0; |
| 187 | |
| 188 | lease = &static_lease; |
Denis Vlasenko | 5a3395b | 2006-11-18 19:51:32 +0000 | [diff] [blame] | 189 | } else { |
| 190 | lease = find_lease_by_chaddr(packet.chaddr); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | switch (state[0]) { |
| 194 | case DHCPDISCOVER: |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 195 | log1("Received DISCOVER"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 196 | |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 197 | if (send_offer(&packet) < 0) { |
Denis Vlasenko | a959588 | 2006-09-29 21:30:43 +0000 | [diff] [blame] | 198 | bb_error_msg("send OFFER failed"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 199 | } |
| 200 | break; |
| 201 | case DHCPREQUEST: |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 202 | log1("Received REQUEST"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 203 | |
| 204 | requested = get_option(&packet, DHCP_REQUESTED_IP); |
| 205 | server_id = get_option(&packet, DHCP_SERVER_ID); |
| 206 | |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 207 | if (requested) |
| 208 | move_from_unaligned32(requested_aligned, requested); |
| 209 | if (server_id) |
| 210 | move_from_unaligned32(server_id_aligned, server_id); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 211 | |
| 212 | if (lease) { |
| 213 | if (server_id) { |
| 214 | /* SELECTING State */ |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 215 | log1("server_id = %08x", ntohl(server_id_aligned)); |
Denys Vlasenko | 990a617 | 2009-06-16 10:23:55 +0200 | [diff] [blame] | 216 | if (server_id_aligned == server_config.server_nip |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 217 | && requested |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 218 | && requested_aligned == lease->lease_nip |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 219 | ) { |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 220 | send_ACK(&packet, lease->lease_nip); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 221 | } |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 222 | } else if (requested) { |
| 223 | /* INIT-REBOOT State */ |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 224 | if (lease->lease_nip == requested_aligned) |
| 225 | send_ACK(&packet, lease->lease_nip); |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 226 | else |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 227 | send_NAK(&packet); |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 228 | } else if (lease->lease_nip == packet.ciaddr) { |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 229 | /* RENEWING or REBINDING State */ |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 230 | send_ACK(&packet, lease->lease_nip); |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 231 | } else { /* don't know what to do!!!! */ |
| 232 | send_NAK(&packet); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | /* what to do if we have no record of the client */ |
| 236 | } else if (server_id) { |
| 237 | /* SELECTING State */ |
| 238 | |
| 239 | } else if (requested) { |
| 240 | /* INIT-REBOOT State */ |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 241 | lease = find_lease_by_yiaddr(requested_aligned); |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 242 | if (lease) { |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 243 | if (lease_expired(lease)) { |
| 244 | /* probably best if we drop this lease */ |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 245 | memset(lease->lease_mac16, 0, 16); |
| 246 | } else { |
| 247 | /* make some contention for this address */ |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 248 | send_NAK(&packet); |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 249 | } |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 250 | } else { |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 251 | uint32_t r = ntohl(requested_aligned); |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 252 | if (r < server_config.start_ip |
| 253 | || r > server_config.end_ip |
| 254 | ) { |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 255 | send_NAK(&packet); |
Denis Vlasenko | c82b510 | 2007-07-01 17:05:57 +0000 | [diff] [blame] | 256 | } |
Denis Vlasenko | e6bce97 | 2007-07-01 17:11:54 +0000 | [diff] [blame] | 257 | /* else remain silent */ |
| 258 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 259 | |
| 260 | } else { |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 261 | /* RENEWING or REBINDING State */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 262 | } |
| 263 | break; |
| 264 | case DHCPDECLINE: |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 265 | log1("Received DECLINE"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 266 | if (lease) { |
Denys Vlasenko | 1d924f5 | 2009-06-16 10:23:01 +0200 | [diff] [blame] | 267 | memset(lease->lease_mac16, 0, 16); |
Denis Vlasenko | 04158e0 | 2009-02-02 10:48:06 +0000 | [diff] [blame] | 268 | lease->expires = time(NULL) + server_config.decline_time; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 269 | } |
| 270 | break; |
| 271 | case DHCPRELEASE: |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 272 | log1("Received RELEASE"); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 273 | if (lease) |
Denis Vlasenko | 04158e0 | 2009-02-02 10:48:06 +0000 | [diff] [blame] | 274 | lease->expires = time(NULL); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 275 | break; |
| 276 | case DHCPINFORM: |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame^] | 277 | log1("Received INFORM"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 278 | send_inform(&packet); |
| 279 | break; |
| 280 | default: |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 281 | bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 282 | } |
| 283 | } |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 284 | ret0: |
| 285 | retval = 0; |
| 286 | ret: |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 287 | /*if (server_config.pidfile) - server_config.pidfile is never NULL */ |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 288 | remove_pidfile(server_config.pidfile); |
| 289 | return retval; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 290 | } |