1 | /* dhcpc.c
|
---|
2 | *
|
---|
3 | * udhcp DHCP client
|
---|
4 | *
|
---|
5 | * Russ Dill <Russ.Dill@asu.edu> July 2001
|
---|
6 | *
|
---|
7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
8 | */
|
---|
9 |
|
---|
10 | #include <sys/file.h>
|
---|
11 | #include <unistd.h>
|
---|
12 | #include <getopt.h>
|
---|
13 | #include <stdlib.h>
|
---|
14 | #include <sys/socket.h>
|
---|
15 | #include <netinet/in.h>
|
---|
16 | #include <arpa/inet.h>
|
---|
17 | #include <signal.h>
|
---|
18 | #include <time.h>
|
---|
19 | #include <string.h>
|
---|
20 | #include <sys/ioctl.h>
|
---|
21 | #include <net/if.h>
|
---|
22 | #include <errno.h>
|
---|
23 |
|
---|
24 | #include "common.h"
|
---|
25 | #include "dhcpd.h"
|
---|
26 | #include "dhcpc.h"
|
---|
27 | #include "options.h"
|
---|
28 | #include "clientpacket.h"
|
---|
29 | #include "clientsocket.h"
|
---|
30 | #include "socket.h"
|
---|
31 | #include "signalpipe.h"
|
---|
32 |
|
---|
33 | static int state;
|
---|
34 | static unsigned long requested_ip; /* = 0 */
|
---|
35 | static unsigned long server_addr;
|
---|
36 | static unsigned long timeout;
|
---|
37 | static int packet_num; /* = 0 */
|
---|
38 | static int fd = -1;
|
---|
39 |
|
---|
40 | #define LISTEN_NONE 0
|
---|
41 | #define LISTEN_KERNEL 1
|
---|
42 | #define LISTEN_RAW 2
|
---|
43 | static int listen_mode;
|
---|
44 |
|
---|
45 | struct client_config_t client_config = {
|
---|
46 | /* Default options. */
|
---|
47 | .abort_if_no_lease = 0,
|
---|
48 | .foreground = 0,
|
---|
49 | .quit_after_lease = 0,
|
---|
50 | .background_if_no_lease = 0,
|
---|
51 | .interface = "eth0",
|
---|
52 | .pidfile = NULL,
|
---|
53 | .script = DEFAULT_SCRIPT,
|
---|
54 | .clientid = NULL,
|
---|
55 | .vendorclass = NULL,
|
---|
56 | .hostname = NULL,
|
---|
57 | .fqdn = NULL,
|
---|
58 | .ifindex = 0,
|
---|
59 | .retries = 3,
|
---|
60 | .timeout = 3,
|
---|
61 | .arp = "\0\0\0\0\0\0", /* appease gcc-3.0 */
|
---|
62 | };
|
---|
63 |
|
---|
64 | /* just a little helper */
|
---|
65 | static void change_mode(int new_mode)
|
---|
66 | {
|
---|
67 | DEBUG(LOG_INFO, "entering %s listen mode",
|
---|
68 | new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
|
---|
69 | if (fd >= 0) close(fd);
|
---|
70 | fd = -1;
|
---|
71 | listen_mode = new_mode;
|
---|
72 | }
|
---|
73 |
|
---|
74 |
|
---|
75 | /* perform a renew */
|
---|
76 | static void perform_renew(void)
|
---|
77 | {
|
---|
78 | LOG(LOG_INFO, "Performing a DHCP renew");
|
---|
79 | switch (state) {
|
---|
80 | case BOUND:
|
---|
81 | change_mode(LISTEN_KERNEL);
|
---|
82 | case RENEWING:
|
---|
83 | case REBINDING:
|
---|
84 | state = RENEW_REQUESTED;
|
---|
85 | break;
|
---|
86 | case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
|
---|
87 | udhcp_run_script(NULL, "deconfig");
|
---|
88 | case REQUESTING:
|
---|
89 | case RELEASED:
|
---|
90 | change_mode(LISTEN_RAW);
|
---|
91 | state = INIT_SELECTING;
|
---|
92 | break;
|
---|
93 | case INIT_SELECTING:
|
---|
94 | break;
|
---|
95 | }
|
---|
96 |
|
---|
97 | /* start things over */
|
---|
98 | packet_num = 0;
|
---|
99 |
|
---|
100 | /* Kill any timeouts because the user wants this to hurry along */
|
---|
101 | timeout = 0;
|
---|
102 | }
|
---|
103 |
|
---|
104 |
|
---|
105 | /* perform a release */
|
---|
106 | static void perform_release(void)
|
---|
107 | {
|
---|
108 | char buffer[16];
|
---|
109 | struct in_addr temp_addr;
|
---|
110 |
|
---|
111 | /* send release packet */
|
---|
112 | if (state == BOUND || state == RENEWING || state == REBINDING) {
|
---|
113 | temp_addr.s_addr = server_addr;
|
---|
114 | sprintf(buffer, "%s", inet_ntoa(temp_addr));
|
---|
115 | temp_addr.s_addr = requested_ip;
|
---|
116 | LOG(LOG_INFO, "Unicasting a release of %s to %s",
|
---|
117 | inet_ntoa(temp_addr), buffer);
|
---|
118 | send_release(server_addr, requested_ip); /* unicast */
|
---|
119 | udhcp_run_script(NULL, "deconfig");
|
---|
120 | }
|
---|
121 | LOG(LOG_INFO, "Entering released state");
|
---|
122 |
|
---|
123 | change_mode(LISTEN_NONE);
|
---|
124 | state = RELEASED;
|
---|
125 | timeout = 0x7fffffff;
|
---|
126 | }
|
---|
127 |
|
---|
128 |
|
---|
129 | static void client_background(void)
|
---|
130 | {
|
---|
131 | udhcp_background(client_config.pidfile);
|
---|
132 | client_config.foreground = 1; /* Do not fork again. */
|
---|
133 | client_config.background_if_no_lease = 0;
|
---|
134 | }
|
---|
135 |
|
---|
136 |
|
---|
137 | int udhcpc_main(int argc, char *argv[])
|
---|
138 | {
|
---|
139 | uint8_t *temp, *message;
|
---|
140 | unsigned long t1 = 0, t2 = 0, xid = 0;
|
---|
141 | unsigned long start = 0, lease;
|
---|
142 | fd_set rfds;
|
---|
143 | int retval;
|
---|
144 | struct timeval tv;
|
---|
145 | int c, len;
|
---|
146 | struct dhcpMessage packet;
|
---|
147 | struct in_addr temp_addr;
|
---|
148 | long now;
|
---|
149 | int max_fd;
|
---|
150 | int sig;
|
---|
151 | int no_clientid = 0;
|
---|
152 |
|
---|
153 | static const struct option arg_options[] = {
|
---|
154 | {"clientid", required_argument, 0, 'c'},
|
---|
155 | {"clientid-none", no_argument, 0, 'C'},
|
---|
156 | {"vendorclass", required_argument, 0, 'V'},
|
---|
157 | {"foreground", no_argument, 0, 'f'},
|
---|
158 | {"background", no_argument, 0, 'b'},
|
---|
159 | {"hostname", required_argument, 0, 'H'},
|
---|
160 | {"hostname", required_argument, 0, 'h'},
|
---|
161 | {"fqdn", required_argument, 0, 'F'},
|
---|
162 | {"interface", required_argument, 0, 'i'},
|
---|
163 | {"now", no_argument, 0, 'n'},
|
---|
164 | {"pidfile", required_argument, 0, 'p'},
|
---|
165 | {"quit", no_argument, 0, 'q'},
|
---|
166 | {"request", required_argument, 0, 'r'},
|
---|
167 | {"script", required_argument, 0, 's'},
|
---|
168 | {"timeout", required_argument, 0, 'T'},
|
---|
169 | {"version", no_argument, 0, 'v'},
|
---|
170 | {"retries", required_argument, 0, 't'},
|
---|
171 | {0, 0, 0, 0}
|
---|
172 | };
|
---|
173 |
|
---|
174 | /* get options */
|
---|
175 | while (1) {
|
---|
176 | int option_index = 0;
|
---|
177 | c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:T:t:v", arg_options, &option_index);
|
---|
178 | if (c == -1) break;
|
---|
179 |
|
---|
180 | switch (c) {
|
---|
181 | case 'c':
|
---|
182 | if (no_clientid) bb_show_usage();
|
---|
183 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
|
---|
184 | free(client_config.clientid);
|
---|
185 | client_config.clientid = xmalloc(len + 2);
|
---|
186 | client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
|
---|
187 | client_config.clientid[OPT_LEN] = len;
|
---|
188 | client_config.clientid[OPT_DATA] = '\0';
|
---|
189 | strncpy((char*)client_config.clientid + OPT_DATA, optarg, len);
|
---|
190 | break;
|
---|
191 | case 'C':
|
---|
192 | if (client_config.clientid) bb_show_usage();
|
---|
193 | no_clientid = 1;
|
---|
194 | break;
|
---|
195 | case 'V':
|
---|
196 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
|
---|
197 | free(client_config.vendorclass);
|
---|
198 | client_config.vendorclass = xmalloc(len + 2);
|
---|
199 | client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
|
---|
200 | client_config.vendorclass[OPT_LEN] = len;
|
---|
201 | strncpy((char*)client_config.vendorclass + OPT_DATA, optarg, len);
|
---|
202 | break;
|
---|
203 | case 'f':
|
---|
204 | client_config.foreground = 1;
|
---|
205 | break;
|
---|
206 | case 'b':
|
---|
207 | client_config.background_if_no_lease = 1;
|
---|
208 | break;
|
---|
209 | case 'h':
|
---|
210 | case 'H':
|
---|
211 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
|
---|
212 | free(client_config.hostname);
|
---|
213 | client_config.hostname = xmalloc(len + 2);
|
---|
214 | client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
|
---|
215 | client_config.hostname[OPT_LEN] = len;
|
---|
216 | strncpy((char*)client_config.hostname + 2, optarg, len);
|
---|
217 | break;
|
---|
218 | case 'F':
|
---|
219 | len = strlen(optarg) > 255 ? 255 : strlen(optarg);
|
---|
220 | free(client_config.fqdn);
|
---|
221 | client_config.fqdn = xmalloc(len + 5);
|
---|
222 | client_config.fqdn[OPT_CODE] = DHCP_FQDN;
|
---|
223 | client_config.fqdn[OPT_LEN] = len + 3;
|
---|
224 | /* Flags: 0000NEOS
|
---|
225 | S: 1 => Client requests Server to update A RR in DNS as well as PTR
|
---|
226 | O: 1 => Server indicates to client that DNS has been updated regardless
|
---|
227 | E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
|
---|
228 | N: 1 => Client requests Server to not update DNS
|
---|
229 | */
|
---|
230 | client_config.fqdn[OPT_LEN + 1] = 0x1;
|
---|
231 | client_config.fqdn[OPT_LEN + 2] = 0;
|
---|
232 | client_config.fqdn[OPT_LEN + 3] = 0;
|
---|
233 | strncpy((char*)client_config.fqdn + 5, optarg, len);
|
---|
234 | break;
|
---|
235 | case 'i':
|
---|
236 | client_config.interface = optarg;
|
---|
237 | break;
|
---|
238 | case 'n':
|
---|
239 | client_config.abort_if_no_lease = 1;
|
---|
240 | break;
|
---|
241 | case 'p':
|
---|
242 | client_config.pidfile = optarg;
|
---|
243 | break;
|
---|
244 | case 'q':
|
---|
245 | client_config.quit_after_lease = 1;
|
---|
246 | break;
|
---|
247 | case 'r':
|
---|
248 | requested_ip = inet_addr(optarg);
|
---|
249 | break;
|
---|
250 | case 's':
|
---|
251 | client_config.script = optarg;
|
---|
252 | break;
|
---|
253 | case 'T':
|
---|
254 | client_config.timeout = atoi(optarg);
|
---|
255 | break;
|
---|
256 | case 't':
|
---|
257 | client_config.retries = atoi(optarg);
|
---|
258 | break;
|
---|
259 | case 'v':
|
---|
260 | printf("version %s\n\n", BB_VER);
|
---|
261 | return 0;
|
---|
262 | break;
|
---|
263 | default:
|
---|
264 | bb_show_usage();
|
---|
265 | }
|
---|
266 | }
|
---|
267 |
|
---|
268 | /* Start the log, sanitize fd's, and write a pid file */
|
---|
269 | udhcp_start_log_and_pid("udhcpc", client_config.pidfile);
|
---|
270 |
|
---|
271 | if (read_interface(client_config.interface, &client_config.ifindex,
|
---|
272 | NULL, client_config.arp) < 0)
|
---|
273 | return 1;
|
---|
274 |
|
---|
275 | /* if not set, and not suppressed, setup the default client ID */
|
---|
276 | if (!client_config.clientid && !no_clientid) {
|
---|
277 | client_config.clientid = xmalloc(6 + 3);
|
---|
278 | client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
|
---|
279 | client_config.clientid[OPT_LEN] = 7;
|
---|
280 | client_config.clientid[OPT_DATA] = 1;
|
---|
281 | memcpy(client_config.clientid + 3, client_config.arp, 6);
|
---|
282 | }
|
---|
283 |
|
---|
284 | if (!client_config.vendorclass) {
|
---|
285 | client_config.vendorclass = xmalloc(sizeof("udhcp "BB_VER) + 2);
|
---|
286 | client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
|
---|
287 | client_config.vendorclass[OPT_LEN] = sizeof("udhcp "BB_VER) - 1;
|
---|
288 | client_config.vendorclass[OPT_DATA] = 1;
|
---|
289 | memcpy(&client_config.vendorclass[OPT_DATA],
|
---|
290 | "udhcp "BB_VER, sizeof("udhcp "BB_VER) - 1);
|
---|
291 | }
|
---|
292 |
|
---|
293 |
|
---|
294 | /* setup the signal pipe */
|
---|
295 | udhcp_sp_setup();
|
---|
296 |
|
---|
297 | state = INIT_SELECTING;
|
---|
298 | udhcp_run_script(NULL, "deconfig");
|
---|
299 | change_mode(LISTEN_RAW);
|
---|
300 |
|
---|
301 | for (;;) {
|
---|
302 |
|
---|
303 | tv.tv_sec = timeout - uptime();
|
---|
304 | tv.tv_usec = 0;
|
---|
305 |
|
---|
306 | if (listen_mode != LISTEN_NONE && fd < 0) {
|
---|
307 | if (listen_mode == LISTEN_KERNEL)
|
---|
308 | fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
|
---|
309 | else
|
---|
310 | fd = raw_socket(client_config.ifindex);
|
---|
311 | if (fd < 0) {
|
---|
312 | LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
|
---|
313 | return 0;
|
---|
314 | }
|
---|
315 | }
|
---|
316 | max_fd = udhcp_sp_fd_set(&rfds, fd);
|
---|
317 |
|
---|
318 | if (tv.tv_sec > 0) {
|
---|
319 | DEBUG(LOG_INFO, "Waiting on select...");
|
---|
320 | retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
|
---|
321 | } else retval = 0; /* If we already timed out, fall through */
|
---|
322 |
|
---|
323 | now = uptime();
|
---|
324 | if (retval == 0) {
|
---|
325 | /* timeout dropped to zero */
|
---|
326 | switch (state) {
|
---|
327 | case INIT_SELECTING:
|
---|
328 | if (packet_num < client_config.retries) {
|
---|
329 | if (packet_num == 0)
|
---|
330 | xid = random_xid();
|
---|
331 |
|
---|
332 | /* send discover packet */
|
---|
333 | send_discover(xid, requested_ip); /* broadcast */
|
---|
334 |
|
---|
335 | timeout = now + client_config.timeout;
|
---|
336 | packet_num++;
|
---|
337 | } else {
|
---|
338 | udhcp_run_script(NULL, "leasefail");
|
---|
339 | if (client_config.background_if_no_lease) {
|
---|
340 | LOG(LOG_INFO, "No lease, forking to background.");
|
---|
341 | client_background();
|
---|
342 | } else if (client_config.abort_if_no_lease) {
|
---|
343 | LOG(LOG_INFO, "No lease, failing.");
|
---|
344 | return 1;
|
---|
345 | }
|
---|
346 | /* wait to try again */
|
---|
347 | packet_num = 0;
|
---|
348 | timeout = now + 60;
|
---|
349 | }
|
---|
350 | break;
|
---|
351 | case RENEW_REQUESTED:
|
---|
352 | case REQUESTING:
|
---|
353 | if (packet_num < client_config.retries) {
|
---|
354 | /* send request packet */
|
---|
355 | if (state == RENEW_REQUESTED)
|
---|
356 | send_renew(xid, server_addr, requested_ip); /* unicast */
|
---|
357 | else send_selecting(xid, server_addr, requested_ip); /* broadcast */
|
---|
358 |
|
---|
359 | timeout = now + ((packet_num == 2) ? 10 : 2);
|
---|
360 | packet_num++;
|
---|
361 | } else {
|
---|
362 | /* timed out, go back to init state */
|
---|
363 | if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
|
---|
364 | state = INIT_SELECTING;
|
---|
365 | timeout = now;
|
---|
366 | packet_num = 0;
|
---|
367 | change_mode(LISTEN_RAW);
|
---|
368 | }
|
---|
369 | break;
|
---|
370 | case BOUND:
|
---|
371 | /* Lease is starting to run out, time to enter renewing state */
|
---|
372 | state = RENEWING;
|
---|
373 | change_mode(LISTEN_KERNEL);
|
---|
374 | DEBUG(LOG_INFO, "Entering renew state");
|
---|
375 | /* fall right through */
|
---|
376 | case RENEWING:
|
---|
377 | /* Either set a new T1, or enter REBINDING state */
|
---|
378 | if ((t2 - t1) <= (lease / 14400 + 1)) {
|
---|
379 | /* timed out, enter rebinding state */
|
---|
380 | state = REBINDING;
|
---|
381 | timeout = now + (t2 - t1);
|
---|
382 | DEBUG(LOG_INFO, "Entering rebinding state");
|
---|
383 | } else {
|
---|
384 | /* send a request packet */
|
---|
385 | send_renew(xid, server_addr, requested_ip); /* unicast */
|
---|
386 |
|
---|
387 | t1 = (t2 - t1) / 2 + t1;
|
---|
388 | timeout = t1 + start;
|
---|
389 | }
|
---|
390 | break;
|
---|
391 | case REBINDING:
|
---|
392 | /* Either set a new T2, or enter INIT state */
|
---|
393 | if ((lease - t2) <= (lease / 14400 + 1)) {
|
---|
394 | /* timed out, enter init state */
|
---|
395 | state = INIT_SELECTING;
|
---|
396 | LOG(LOG_INFO, "Lease lost, entering init state");
|
---|
397 | udhcp_run_script(NULL, "deconfig");
|
---|
398 | timeout = now;
|
---|
399 | packet_num = 0;
|
---|
400 | change_mode(LISTEN_RAW);
|
---|
401 | } else {
|
---|
402 | /* send a request packet */
|
---|
403 | send_renew(xid, 0, requested_ip); /* broadcast */
|
---|
404 |
|
---|
405 | t2 = (lease - t2) / 2 + t2;
|
---|
406 | timeout = t2 + start;
|
---|
407 | }
|
---|
408 | break;
|
---|
409 | case RELEASED:
|
---|
410 | /* yah, I know, *you* say it would never happen */
|
---|
411 | timeout = 0x7fffffff;
|
---|
412 | break;
|
---|
413 | }
|
---|
414 | } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
|
---|
415 | /* a packet is ready, read it */
|
---|
416 |
|
---|
417 | if (listen_mode == LISTEN_KERNEL)
|
---|
418 | len = udhcp_get_packet(&packet, fd);
|
---|
419 | else len = get_raw_packet(&packet, fd);
|
---|
420 |
|
---|
421 | if (len == -1 && errno != EINTR) {
|
---|
422 | DEBUG(LOG_INFO, "error on read, %m, reopening socket");
|
---|
423 | change_mode(listen_mode); /* just close and reopen */
|
---|
424 | }
|
---|
425 | if (len < 0) continue;
|
---|
426 |
|
---|
427 | if (packet.xid != xid) {
|
---|
428 | DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
|
---|
429 | (unsigned long) packet.xid, xid);
|
---|
430 | continue;
|
---|
431 | }
|
---|
432 |
|
---|
433 | /* Ignore packets that aren't for us */
|
---|
434 | if (memcmp(packet.chaddr, client_config.arp, 6)) {
|
---|
435 | DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
|
---|
436 | continue;
|
---|
437 | }
|
---|
438 |
|
---|
439 | if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
|
---|
440 | DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
|
---|
441 | continue;
|
---|
442 | }
|
---|
443 |
|
---|
444 | switch (state) {
|
---|
445 | case INIT_SELECTING:
|
---|
446 | /* Must be a DHCPOFFER to one of our xid's */
|
---|
447 | if (*message == DHCPOFFER) {
|
---|
448 | if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
|
---|
449 | memcpy(&server_addr, temp, 4);
|
---|
450 | xid = packet.xid;
|
---|
451 | requested_ip = packet.yiaddr;
|
---|
452 |
|
---|
453 | /* enter requesting state */
|
---|
454 | state = REQUESTING;
|
---|
455 | timeout = now;
|
---|
456 | packet_num = 0;
|
---|
457 | } else {
|
---|
458 | DEBUG(LOG_ERR, "No server ID in message");
|
---|
459 | }
|
---|
460 | }
|
---|
461 | break;
|
---|
462 | case RENEW_REQUESTED:
|
---|
463 | case REQUESTING:
|
---|
464 | case RENEWING:
|
---|
465 | case REBINDING:
|
---|
466 | if (*message == DHCPACK) {
|
---|
467 | if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
|
---|
468 | LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
|
---|
469 | lease = 60 * 60;
|
---|
470 | } else {
|
---|
471 | memcpy(&lease, temp, 4);
|
---|
472 | lease = ntohl(lease);
|
---|
473 | }
|
---|
474 |
|
---|
475 | /* enter bound state */
|
---|
476 | t1 = lease / 2;
|
---|
477 |
|
---|
478 | /* little fixed point for n * .875 */
|
---|
479 | t2 = (lease * 0x7) >> 3;
|
---|
480 | temp_addr.s_addr = packet.yiaddr;
|
---|
481 | LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
|
---|
482 | inet_ntoa(temp_addr), lease);
|
---|
483 | start = now;
|
---|
484 | timeout = t1 + start;
|
---|
485 | requested_ip = packet.yiaddr;
|
---|
486 | udhcp_run_script(&packet,
|
---|
487 | ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
|
---|
488 |
|
---|
489 | state = BOUND;
|
---|
490 | change_mode(LISTEN_NONE);
|
---|
491 | if (client_config.quit_after_lease)
|
---|
492 | return 0;
|
---|
493 | if (!client_config.foreground)
|
---|
494 | client_background();
|
---|
495 |
|
---|
496 | } else if (*message == DHCPNAK) {
|
---|
497 | /* return to init state */
|
---|
498 | LOG(LOG_INFO, "Received DHCP NAK");
|
---|
499 | udhcp_run_script(&packet, "nak");
|
---|
500 | if (state != REQUESTING)
|
---|
501 | udhcp_run_script(NULL, "deconfig");
|
---|
502 | state = INIT_SELECTING;
|
---|
503 | timeout = now;
|
---|
504 | requested_ip = 0;
|
---|
505 | packet_num = 0;
|
---|
506 | change_mode(LISTEN_RAW);
|
---|
507 | sleep(3); /* avoid excessive network traffic */
|
---|
508 | }
|
---|
509 | break;
|
---|
510 | /* case BOUND, RELEASED: - ignore all packets */
|
---|
511 | }
|
---|
512 | } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
|
---|
513 | switch (sig) {
|
---|
514 | case SIGUSR1:
|
---|
515 | perform_renew();
|
---|
516 | break;
|
---|
517 | case SIGUSR2:
|
---|
518 | perform_release();
|
---|
519 | break;
|
---|
520 | case SIGTERM:
|
---|
521 | LOG(LOG_INFO, "Received SIGTERM");
|
---|
522 | return 0;
|
---|
523 | }
|
---|
524 | } else if (retval == -1 && errno == EINTR) {
|
---|
525 | /* a signal was caught */
|
---|
526 | } else {
|
---|
527 | /* An error occured */
|
---|
528 | DEBUG(LOG_ERR, "Error on select");
|
---|
529 | }
|
---|
530 |
|
---|
531 | }
|
---|
532 | return 0;
|
---|
533 | }
|
---|