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Russ Dill61fb4892002-10-14 21:41:28 +00001/* dhcpc.c
2 *
3 * udhcp DHCP client
4 *
5 * Russ Dill <Russ.Dill@asu.edu> July 2001
6 *
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +00007 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Russ Dill61fb4892002-10-14 21:41:28 +00008 */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00009
Russ Dill61fb4892002-10-14 21:41:28 +000010#include <sys/time.h>
Russ Dill61fb4892002-10-14 21:41:28 +000011#include <sys/file.h>
12#include <unistd.h>
13#include <getopt.h>
14#include <stdlib.h>
15#include <sys/socket.h>
16#include <netinet/in.h>
17#include <arpa/inet.h>
18#include <signal.h>
19#include <time.h>
20#include <string.h>
21#include <sys/ioctl.h>
22#include <net/if.h>
23#include <errno.h>
24
"Vladimir N. Oleynik"b6284092005-09-23 11:25:29 +000025#include "common.h"
Russ Dill61fb4892002-10-14 21:41:28 +000026#include "dhcpd.h"
27#include "dhcpc.h"
28#include "options.h"
29#include "clientpacket.h"
Russ Dill4e864a32003-12-18 22:25:38 +000030#include "clientsocket.h"
Russ Dill61fb4892002-10-14 21:41:28 +000031#include "script.h"
32#include "socket.h"
Russ Dill4e864a32003-12-18 22:25:38 +000033#include "signalpipe.h"
Russ Dill61fb4892002-10-14 21:41:28 +000034
35static int state;
36static unsigned long requested_ip; /* = 0 */
37static unsigned long server_addr;
38static unsigned long timeout;
39static int packet_num; /* = 0 */
Russ Dill6393d692003-01-21 22:39:34 +000040static int fd = -1;
Russ Dill61fb4892002-10-14 21:41:28 +000041
42#define LISTEN_NONE 0
43#define LISTEN_KERNEL 1
44#define LISTEN_RAW 2
45static int listen_mode;
46
Russ Dill61fb4892002-10-14 21:41:28 +000047struct client_config_t client_config = {
48 /* Default options. */
Mike Frysinger3cc01a82005-04-16 04:17:39 +000049 .abort_if_no_lease = 0,
50 .foreground = 0,
51 .quit_after_lease = 0,
52 .background_if_no_lease = 0,
53 .interface = "eth0",
54 .pidfile = NULL,
55 .script = DEFAULT_SCRIPT,
56 .clientid = NULL,
Paul Fox28de9512005-09-22 18:59:13 +000057 .vendorclass = NULL,
Mike Frysinger3cc01a82005-04-16 04:17:39 +000058 .hostname = NULL,
59 .fqdn = NULL,
60 .ifindex = 0,
Rob Landleya2841e62006-02-20 23:26:38 +000061 .retries = 3,
Mike Frysinger3cc01a82005-04-16 04:17:39 +000062 .arp = "\0\0\0\0\0\0", /* appease gcc-3.0 */
Russ Dill61fb4892002-10-14 21:41:28 +000063};
64
Russ Dill4b77aca2003-12-16 02:28:20 +000065#ifndef IN_BUSYBOX
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000066static void ATTRIBUTE_NORETURN show_usage(void)
Russ Dill4b77aca2003-12-16 02:28:20 +000067{
Russ Dill4e864a32003-12-18 22:25:38 +000068 printf(
Russ Dill4b77aca2003-12-16 02:28:20 +000069"Usage: udhcpc [OPTIONS]\n\n"
Paul Fox28de9512005-09-22 18:59:13 +000070" -c, --clientid=CLIENTID Set client identifier - type is first char\n"
Paul Foxa39bba32005-08-01 14:31:13 +000071" -C, --clientid-none Suppress default client identifier\n"
Paul Fox28de9512005-09-22 18:59:13 +000072" -V, --vendorclass=CLASSID Set vendor class identifier\n"
Russ Dill4b77aca2003-12-16 02:28:20 +000073" -H, --hostname=HOSTNAME Client hostname\n"
74" -h Alias for -H\n"
Mike Frysingerd8248532004-12-06 14:59:45 +000075" -F, --fqdn=FQDN Client fully qualified domain name\n"
Russ Dill4b77aca2003-12-16 02:28:20 +000076" -f, --foreground Do not fork after getting lease\n"
77" -b, --background Fork to background if lease cannot be\n"
78" immediately negotiated.\n"
79" -i, --interface=INTERFACE Interface to use (default: eth0)\n"
80" -n, --now Exit with failure if lease cannot be\n"
81" immediately negotiated.\n"
82" -p, --pidfile=file Store process ID of daemon in file\n"
83" -q, --quit Quit after obtaining lease\n"
84" -r, --request=IP IP address to request (default: none)\n"
85" -s, --script=file Run file at dhcp events (default:\n"
86" " DEFAULT_SCRIPT ")\n"
87" -v, --version Display version\n"
Russ Dill4e864a32003-12-18 22:25:38 +000088 );
89 exit(0);
Russ Dill4b77aca2003-12-16 02:28:20 +000090}
91#else
92#define show_usage bb_show_usage
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000093extern void show_usage(void) ATTRIBUTE_NORETURN;
Russ Dill4b77aca2003-12-16 02:28:20 +000094#endif
95
96
Russ Dill61fb4892002-10-14 21:41:28 +000097/* just a little helper */
98static void change_mode(int new_mode)
99{
100 DEBUG(LOG_INFO, "entering %s listen mode",
101 new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
Russ Dill6393d692003-01-21 22:39:34 +0000102 if (fd >= 0) close(fd);
Russ Dill61fb4892002-10-14 21:41:28 +0000103 fd = -1;
104 listen_mode = new_mode;
105}
106
107
108/* perform a renew */
109static void perform_renew(void)
110{
111 LOG(LOG_INFO, "Performing a DHCP renew");
112 switch (state) {
Russ Dill61fb4892002-10-14 21:41:28 +0000113 case BOUND:
Russ Dill61fb4892002-10-14 21:41:28 +0000114 change_mode(LISTEN_KERNEL);
Russ Dillf5ecd432002-10-31 19:21:27 +0000115 case RENEWING:
116 case REBINDING:
Russ Dill61fb4892002-10-14 21:41:28 +0000117 state = RENEW_REQUESTED;
118 break;
Russ Dillf5ecd432002-10-31 19:21:27 +0000119 case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
120 run_script(NULL, "deconfig");
Russ Dill61fb4892002-10-14 21:41:28 +0000121 case REQUESTING:
122 case RELEASED:
123 change_mode(LISTEN_RAW);
124 state = INIT_SELECTING;
125 break;
126 case INIT_SELECTING:
Eric Andersen1b2e7c32003-06-20 09:20:28 +0000127 break;
Russ Dill61fb4892002-10-14 21:41:28 +0000128 }
129
130 /* start things over */
131 packet_num = 0;
132
133 /* Kill any timeouts because the user wants this to hurry along */
134 timeout = 0;
135}
136
137
138/* perform a release */
139static void perform_release(void)
140{
141 char buffer[16];
142 struct in_addr temp_addr;
143
144 /* send release packet */
145 if (state == BOUND || state == RENEWING || state == REBINDING) {
146 temp_addr.s_addr = server_addr;
147 sprintf(buffer, "%s", inet_ntoa(temp_addr));
148 temp_addr.s_addr = requested_ip;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000149 LOG(LOG_INFO, "Unicasting a release of %s to %s",
Russ Dill61fb4892002-10-14 21:41:28 +0000150 inet_ntoa(temp_addr), buffer);
151 send_release(server_addr, requested_ip); /* unicast */
152 run_script(NULL, "deconfig");
153 }
154 LOG(LOG_INFO, "Entering released state");
155
156 change_mode(LISTEN_NONE);
157 state = RELEASED;
158 timeout = 0x7fffffff;
159}
160
161
Glenn L McGrath24833432003-06-10 17:22:49 +0000162static void client_background(void)
Russ Dill61fb4892002-10-14 21:41:28 +0000163{
Glenn L McGrath24833432003-06-10 17:22:49 +0000164 background(client_config.pidfile);
Russ Dill61fb4892002-10-14 21:41:28 +0000165 client_config.foreground = 1; /* Do not fork again. */
Russ Dill6393d692003-01-21 22:39:34 +0000166 client_config.background_if_no_lease = 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000167}
168
169
Russ Dill4e864a32003-12-18 22:25:38 +0000170#ifdef COMBINED_BINARY
Russ Dill61fb4892002-10-14 21:41:28 +0000171int udhcpc_main(int argc, char *argv[])
Russ Dill4e864a32003-12-18 22:25:38 +0000172#else
173int main(int argc, char *argv[])
174#endif
Russ Dill61fb4892002-10-14 21:41:28 +0000175{
Eric Andersenad953732004-01-30 23:45:53 +0000176 uint8_t *temp, *message;
Russ Dill61fb4892002-10-14 21:41:28 +0000177 unsigned long t1 = 0, t2 = 0, xid = 0;
178 unsigned long start = 0, lease;
179 fd_set rfds;
180 int retval;
181 struct timeval tv;
182 int c, len;
183 struct dhcpMessage packet;
184 struct in_addr temp_addr;
Russ Dill309c7b72004-05-19 08:29:05 +0000185 long now;
Russ Dill61fb4892002-10-14 21:41:28 +0000186 int max_fd;
187 int sig;
Paul Foxa39bba32005-08-01 14:31:13 +0000188 int no_clientid = 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000189
Glenn L McGrath24833432003-06-10 17:22:49 +0000190 static const struct option arg_options[] = {
Russ Dill61fb4892002-10-14 21:41:28 +0000191 {"clientid", required_argument, 0, 'c'},
Paul Foxa39bba32005-08-01 14:31:13 +0000192 {"clientid-none", no_argument, 0, 'C'},
Paul Fox28de9512005-09-22 18:59:13 +0000193 {"vendorclass", required_argument, 0, 'V'},
Russ Dill61fb4892002-10-14 21:41:28 +0000194 {"foreground", no_argument, 0, 'f'},
195 {"background", no_argument, 0, 'b'},
196 {"hostname", required_argument, 0, 'H'},
Mike Frysingerd8248532004-12-06 14:59:45 +0000197 {"hostname", required_argument, 0, 'h'},
198 {"fqdn", required_argument, 0, 'F'},
Russ Dill61fb4892002-10-14 21:41:28 +0000199 {"interface", required_argument, 0, 'i'},
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000200 {"now", no_argument, 0, 'n'},
Russ Dill61fb4892002-10-14 21:41:28 +0000201 {"pidfile", required_argument, 0, 'p'},
202 {"quit", no_argument, 0, 'q'},
203 {"request", required_argument, 0, 'r'},
204 {"script", required_argument, 0, 's'},
205 {"version", no_argument, 0, 'v'},
Rob Landleya2841e62006-02-20 23:26:38 +0000206 {"retries", required_argument, 0, 't'},
Russ Dill61fb4892002-10-14 21:41:28 +0000207 {0, 0, 0, 0}
208 };
209
210 /* get options */
211 while (1) {
212 int option_index = 0;
Rob Landleya2841e62006-02-20 23:26:38 +0000213 c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:t:v", arg_options, &option_index);
Russ Dill61fb4892002-10-14 21:41:28 +0000214 if (c == -1) break;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000215
Russ Dill61fb4892002-10-14 21:41:28 +0000216 switch (c) {
217 case 'c':
Paul Foxa39bba32005-08-01 14:31:13 +0000218 if (no_clientid) show_usage();
Russ Dill61fb4892002-10-14 21:41:28 +0000219 len = strlen(optarg) > 255 ? 255 : strlen(optarg);
Rob Landleye7c43b62006-03-01 16:39:45 +0000220 free(client_config.clientid);
Russ Dill61fb4892002-10-14 21:41:28 +0000221 client_config.clientid = xmalloc(len + 2);
222 client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
223 client_config.clientid[OPT_LEN] = len;
224 client_config.clientid[OPT_DATA] = '\0';
Eric Andersena68ea1c2006-01-30 22:48:39 +0000225 strncpy((char*)client_config.clientid + OPT_DATA, optarg, len);
Russ Dill61fb4892002-10-14 21:41:28 +0000226 break;
Paul Foxa39bba32005-08-01 14:31:13 +0000227 case 'C':
228 if (client_config.clientid) show_usage();
229 no_clientid = 1;
230 break;
Paul Fox28de9512005-09-22 18:59:13 +0000231 case 'V':
232 len = strlen(optarg) > 255 ? 255 : strlen(optarg);
Rob Landleye7c43b62006-03-01 16:39:45 +0000233 free(client_config.vendorclass);
Paul Fox28de9512005-09-22 18:59:13 +0000234 client_config.vendorclass = xmalloc(len + 2);
235 client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
236 client_config.vendorclass[OPT_LEN] = len;
Eric Andersena68ea1c2006-01-30 22:48:39 +0000237 strncpy((char*)client_config.vendorclass + OPT_DATA, optarg, len);
Paul Fox28de9512005-09-22 18:59:13 +0000238 break;
Russ Dill61fb4892002-10-14 21:41:28 +0000239 case 'f':
240 client_config.foreground = 1;
241 break;
242 case 'b':
243 client_config.background_if_no_lease = 1;
244 break;
245 case 'h':
246 case 'H':
247 len = strlen(optarg) > 255 ? 255 : strlen(optarg);
Rob Landleye7c43b62006-03-01 16:39:45 +0000248 free(client_config.hostname);
Russ Dill61fb4892002-10-14 21:41:28 +0000249 client_config.hostname = xmalloc(len + 2);
250 client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
251 client_config.hostname[OPT_LEN] = len;
Eric Andersena68ea1c2006-01-30 22:48:39 +0000252 strncpy((char*)client_config.hostname + 2, optarg, len);
Russ Dill61fb4892002-10-14 21:41:28 +0000253 break;
Mike Frysingerd8248532004-12-06 14:59:45 +0000254 case 'F':
255 len = strlen(optarg) > 255 ? 255 : strlen(optarg);
Rob Landleye7c43b62006-03-01 16:39:45 +0000256 free(client_config.fqdn);
Mike Frysingerd8248532004-12-06 14:59:45 +0000257 client_config.fqdn = xmalloc(len + 5);
258 client_config.fqdn[OPT_CODE] = DHCP_FQDN;
259 client_config.fqdn[OPT_LEN] = len + 3;
260 /* Flags: 0000NEOS
261 S: 1 => Client requests Server to update A RR in DNS as well as PTR
262 O: 1 => Server indicates to client that DNS has been updated regardless
263 E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
264 N: 1 => Client requests Server to not update DNS
265 */
266 client_config.fqdn[OPT_LEN + 1] = 0x1;
267 client_config.fqdn[OPT_LEN + 2] = 0;
268 client_config.fqdn[OPT_LEN + 3] = 0;
Eric Andersena68ea1c2006-01-30 22:48:39 +0000269 strncpy((char*)client_config.fqdn + 5, optarg, len);
Mike Frysingerd8248532004-12-06 14:59:45 +0000270 break;
Russ Dill61fb4892002-10-14 21:41:28 +0000271 case 'i':
272 client_config.interface = optarg;
273 break;
274 case 'n':
275 client_config.abort_if_no_lease = 1;
276 break;
277 case 'p':
278 client_config.pidfile = optarg;
279 break;
280 case 'q':
281 client_config.quit_after_lease = 1;
282 break;
283 case 'r':
284 requested_ip = inet_addr(optarg);
285 break;
286 case 's':
287 client_config.script = optarg;
288 break;
Rob Landleya2841e62006-02-20 23:26:38 +0000289 case 't':
290 client_config.retries = atoi(optarg);
291 break;
Russ Dill61fb4892002-10-14 21:41:28 +0000292 case 'v':
Russ Dill4e864a32003-12-18 22:25:38 +0000293 printf("udhcpcd, version %s\n\n", VERSION);
294 return 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000295 break;
296 default:
Russ Dill4b77aca2003-12-16 02:28:20 +0000297 show_usage();
Russ Dill61fb4892002-10-14 21:41:28 +0000298 }
299 }
300
Russ Dill4e864a32003-12-18 22:25:38 +0000301 /* Start the log, sanitize fd's, and write a pid file */
302 start_log_and_pid("udhcpc", client_config.pidfile);
303
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000304 if (read_interface(client_config.interface, &client_config.ifindex,
Russ Dill61fb4892002-10-14 21:41:28 +0000305 NULL, client_config.arp) < 0)
Russ Dill4e864a32003-12-18 22:25:38 +0000306 return 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000307
Paul Foxa39bba32005-08-01 14:31:13 +0000308 /* if not set, and not suppressed, setup the default client ID */
309 if (!client_config.clientid && !no_clientid) {
Russ Dill61fb4892002-10-14 21:41:28 +0000310 client_config.clientid = xmalloc(6 + 3);
311 client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
312 client_config.clientid[OPT_LEN] = 7;
313 client_config.clientid[OPT_DATA] = 1;
314 memcpy(client_config.clientid + 3, client_config.arp, 6);
315 }
316
Paul Fox28de9512005-09-22 18:59:13 +0000317 if (!client_config.vendorclass) {
318 client_config.vendorclass = xmalloc(sizeof("udhcp "VERSION) + 2);
319 client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
320 client_config.vendorclass[OPT_LEN] = sizeof("udhcp "VERSION) - 1;
321 client_config.vendorclass[OPT_DATA] = 1;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000322 memcpy(&client_config.vendorclass[OPT_DATA],
Paul Fox28de9512005-09-22 18:59:13 +0000323 "udhcp "VERSION, sizeof("udhcp "VERSION) - 1);
324 }
325
326
Russ Dill4e864a32003-12-18 22:25:38 +0000327 /* setup the signal pipe */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000328 udhcp_sp_setup();
329
Russ Dill61fb4892002-10-14 21:41:28 +0000330 state = INIT_SELECTING;
331 run_script(NULL, "deconfig");
332 change_mode(LISTEN_RAW);
333
334 for (;;) {
335
Rob Landley918f2ab2005-05-04 02:15:23 +0000336 tv.tv_sec = timeout - uptime();
Russ Dill61fb4892002-10-14 21:41:28 +0000337 tv.tv_usec = 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000338
339 if (listen_mode != LISTEN_NONE && fd < 0) {
340 if (listen_mode == LISTEN_KERNEL)
341 fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
342 else
343 fd = raw_socket(client_config.ifindex);
344 if (fd < 0) {
Glenn L McGrath24833432003-06-10 17:22:49 +0000345 LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
Russ Dill4e864a32003-12-18 22:25:38 +0000346 return 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000347 }
348 }
Russ Dill4e864a32003-12-18 22:25:38 +0000349 max_fd = udhcp_sp_fd_set(&rfds, fd);
Russ Dill61fb4892002-10-14 21:41:28 +0000350
351 if (tv.tv_sec > 0) {
Glenn L McGrath8ce8f9b2003-08-29 15:19:44 +0000352 DEBUG(LOG_INFO, "Waiting on select...");
Russ Dill61fb4892002-10-14 21:41:28 +0000353 retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
354 } else retval = 0; /* If we already timed out, fall through */
355
Rob Landley918f2ab2005-05-04 02:15:23 +0000356 now = uptime();
Russ Dill61fb4892002-10-14 21:41:28 +0000357 if (retval == 0) {
358 /* timeout dropped to zero */
359 switch (state) {
360 case INIT_SELECTING:
Rob Landleya2841e62006-02-20 23:26:38 +0000361 if (packet_num < client_config.retries) {
Russ Dill61fb4892002-10-14 21:41:28 +0000362 if (packet_num == 0)
363 xid = random_xid();
364
365 /* send discover packet */
366 send_discover(xid, requested_ip); /* broadcast */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000367
Russ Dill61fb4892002-10-14 21:41:28 +0000368 timeout = now + ((packet_num == 2) ? 4 : 2);
369 packet_num++;
370 } else {
Glenn L McGrathd9461f82003-09-01 04:08:36 +0000371 run_script(NULL, "leasefail");
Russ Dill61fb4892002-10-14 21:41:28 +0000372 if (client_config.background_if_no_lease) {
373 LOG(LOG_INFO, "No lease, forking to background.");
Glenn L McGrath24833432003-06-10 17:22:49 +0000374 client_background();
Russ Dill61fb4892002-10-14 21:41:28 +0000375 } else if (client_config.abort_if_no_lease) {
376 LOG(LOG_INFO, "No lease, failing.");
Russ Dill4e864a32003-12-18 22:25:38 +0000377 return 1;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000378 }
Russ Dill61fb4892002-10-14 21:41:28 +0000379 /* wait to try again */
380 packet_num = 0;
381 timeout = now + 60;
382 }
383 break;
384 case RENEW_REQUESTED:
385 case REQUESTING:
Rob Landleya2841e62006-02-20 23:26:38 +0000386 if (packet_num < client_config.retries) {
Russ Dill61fb4892002-10-14 21:41:28 +0000387 /* send request packet */
388 if (state == RENEW_REQUESTED)
389 send_renew(xid, server_addr, requested_ip); /* unicast */
390 else send_selecting(xid, server_addr, requested_ip); /* broadcast */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000391
Russ Dill61fb4892002-10-14 21:41:28 +0000392 timeout = now + ((packet_num == 2) ? 10 : 2);
393 packet_num++;
394 } else {
395 /* timed out, go back to init state */
Russ Dillf5ecd432002-10-31 19:21:27 +0000396 if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
Russ Dill61fb4892002-10-14 21:41:28 +0000397 state = INIT_SELECTING;
398 timeout = now;
399 packet_num = 0;
400 change_mode(LISTEN_RAW);
401 }
402 break;
403 case BOUND:
404 /* Lease is starting to run out, time to enter renewing state */
405 state = RENEWING;
406 change_mode(LISTEN_KERNEL);
407 DEBUG(LOG_INFO, "Entering renew state");
408 /* fall right through */
409 case RENEWING:
410 /* Either set a new T1, or enter REBINDING state */
411 if ((t2 - t1) <= (lease / 14400 + 1)) {
412 /* timed out, enter rebinding state */
413 state = REBINDING;
414 timeout = now + (t2 - t1);
415 DEBUG(LOG_INFO, "Entering rebinding state");
416 } else {
417 /* send a request packet */
418 send_renew(xid, server_addr, requested_ip); /* unicast */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000419
Russ Dill61fb4892002-10-14 21:41:28 +0000420 t1 = (t2 - t1) / 2 + t1;
421 timeout = t1 + start;
422 }
423 break;
424 case REBINDING:
425 /* Either set a new T2, or enter INIT state */
426 if ((lease - t2) <= (lease / 14400 + 1)) {
427 /* timed out, enter init state */
428 state = INIT_SELECTING;
429 LOG(LOG_INFO, "Lease lost, entering init state");
430 run_script(NULL, "deconfig");
431 timeout = now;
432 packet_num = 0;
433 change_mode(LISTEN_RAW);
434 } else {
435 /* send a request packet */
436 send_renew(xid, 0, requested_ip); /* broadcast */
437
438 t2 = (lease - t2) / 2 + t2;
439 timeout = t2 + start;
440 }
441 break;
442 case RELEASED:
443 /* yah, I know, *you* say it would never happen */
444 timeout = 0x7fffffff;
445 break;
446 }
447 } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
448 /* a packet is ready, read it */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000449
Russ Dill61fb4892002-10-14 21:41:28 +0000450 if (listen_mode == LISTEN_KERNEL)
451 len = get_packet(&packet, fd);
452 else len = get_raw_packet(&packet, fd);
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000453
Russ Dill61fb4892002-10-14 21:41:28 +0000454 if (len == -1 && errno != EINTR) {
Glenn L McGrath24833432003-06-10 17:22:49 +0000455 DEBUG(LOG_INFO, "error on read, %m, reopening socket");
Russ Dill61fb4892002-10-14 21:41:28 +0000456 change_mode(listen_mode); /* just close and reopen */
457 }
458 if (len < 0) continue;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000459
Russ Dill61fb4892002-10-14 21:41:28 +0000460 if (packet.xid != xid) {
461 DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
462 (unsigned long) packet.xid, xid);
463 continue;
464 }
Rob Landley0b1ff5a2005-05-26 05:25:12 +0000465 /* Ignore packets that aren't for us */
Paul Fox01f67982005-07-20 19:13:21 +0000466 if (memcmp(packet.chaddr, client_config.arp, 6)) {
467 DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
468 continue;
469 }
470
Russ Dill61fb4892002-10-14 21:41:28 +0000471 if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
472 DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
473 continue;
474 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000475
Russ Dill61fb4892002-10-14 21:41:28 +0000476 switch (state) {
477 case INIT_SELECTING:
478 /* Must be a DHCPOFFER to one of our xid's */
479 if (*message == DHCPOFFER) {
480 if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
481 memcpy(&server_addr, temp, 4);
482 xid = packet.xid;
483 requested_ip = packet.yiaddr;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000484
Russ Dill61fb4892002-10-14 21:41:28 +0000485 /* enter requesting state */
486 state = REQUESTING;
487 timeout = now;
488 packet_num = 0;
489 } else {
490 DEBUG(LOG_ERR, "No server ID in message");
491 }
492 }
493 break;
494 case RENEW_REQUESTED:
495 case REQUESTING:
496 case RENEWING:
497 case REBINDING:
498 if (*message == DHCPACK) {
499 if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
500 LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
501 lease = 60 * 60;
502 } else {
503 memcpy(&lease, temp, 4);
504 lease = ntohl(lease);
505 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000506
Russ Dill61fb4892002-10-14 21:41:28 +0000507 /* enter bound state */
508 t1 = lease / 2;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000509
Russ Dill61fb4892002-10-14 21:41:28 +0000510 /* little fixed point for n * .875 */
511 t2 = (lease * 0x7) >> 3;
512 temp_addr.s_addr = packet.yiaddr;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000513 LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
Russ Dill61fb4892002-10-14 21:41:28 +0000514 inet_ntoa(temp_addr), lease);
515 start = now;
516 timeout = t1 + start;
517 requested_ip = packet.yiaddr;
518 run_script(&packet,
519 ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
520
521 state = BOUND;
522 change_mode(LISTEN_NONE);
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000523 if (client_config.quit_after_lease)
Russ Dill4e864a32003-12-18 22:25:38 +0000524 return 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000525 if (!client_config.foreground)
Glenn L McGrath24833432003-06-10 17:22:49 +0000526 client_background();
Russ Dill61fb4892002-10-14 21:41:28 +0000527
528 } else if (*message == DHCPNAK) {
529 /* return to init state */
530 LOG(LOG_INFO, "Received DHCP NAK");
531 run_script(&packet, "nak");
532 if (state != REQUESTING)
533 run_script(NULL, "deconfig");
534 state = INIT_SELECTING;
535 timeout = now;
536 requested_ip = 0;
537 packet_num = 0;
538 change_mode(LISTEN_RAW);
539 sleep(3); /* avoid excessive network traffic */
540 }
541 break;
542 /* case BOUND, RELEASED: - ignore all packets */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000543 }
Russ Dill4e864a32003-12-18 22:25:38 +0000544 } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
Russ Dill61fb4892002-10-14 21:41:28 +0000545 switch (sig) {
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000546 case SIGUSR1:
Russ Dill61fb4892002-10-14 21:41:28 +0000547 perform_renew();
548 break;
549 case SIGUSR2:
550 perform_release();
551 break;
552 case SIGTERM:
553 LOG(LOG_INFO, "Received SIGTERM");
Russ Dill4e864a32003-12-18 22:25:38 +0000554 return 0;
Russ Dill61fb4892002-10-14 21:41:28 +0000555 }
556 } else if (retval == -1 && errno == EINTR) {
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000557 /* a signal was caught */
Russ Dill61fb4892002-10-14 21:41:28 +0000558 } else {
559 /* An error occured */
560 DEBUG(LOG_ERR, "Error on select");
561 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000562
Russ Dill61fb4892002-10-14 21:41:28 +0000563 }
564 return 0;
565}