Diff of /trunk/mkinitrd-magellan/busybox/networking/udhcp/dhcpd.c

Parent Directory | Revision Log | Patch

	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 18	Line 18
18
19
20	/* globals */	/* globals */
21	struct dhcpOfferedAddr *leases;	struct dyn_lease *g_leases;
22	/* struct server_config_t server_config is in bb_common_bufsiz1 */	/* struct server_config_t server_config is in bb_common_bufsiz1 */
23
24
#	Line 26  int udhcpd_main(int argc, char **argv) M	Line 26  int udhcpd_main(int argc, char **argv) M
26	int udhcpd_main(int argc UNUSED_PARAM, char **argv)	int udhcpd_main(int argc UNUSED_PARAM, char **argv)
27	{	{
28	fd_set rfds;	fd_set rfds;
29	struct timeval tv;	int server_socket = -1, retval, max_sock;
30	int server_socket = -1, bytes, retval, max_sock;	struct dhcp_packet packet;
31	struct dhcpMessage packet;	uint8_t *state;
32	uint8_t *state, *server_id, *requested;	uint32_t static_lease_ip;
	uint32_t server_id_align, requested_align, static_lease_ip;
33	unsigned timeout_end;	unsigned timeout_end;
34	unsigned num_ips;	unsigned num_ips;
35	unsigned opt;	unsigned opt;
36	struct option_set *option;	struct option_set *option;
37	struct dhcpOfferedAddr *lease, static_lease;	struct dyn_lease *lease, fake_lease;
38	USE_FEATURE_UDHCP_PORT(char *str_P;)	IF_FEATURE_UDHCP_PORT(char *str_P;)
39
40	#if ENABLE_FEATURE_UDHCP_PORT	#if ENABLE_FEATURE_UDHCP_PORT
41	SERVER_PORT = 67;	SERVER_PORT = 67;
42	CLIENT_PORT = 68;	CLIENT_PORT = 68;
43	#endif	#endif
44
45	opt = getopt32(argv, "fS" USE_FEATURE_UDHCP_PORT("P:", &str_P));	#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
46		opt_complementary = "vv";
47		#endif
48		opt = getopt32(argv, "fSv"
49		IF_FEATURE_UDHCP_PORT("P:", &str_P)
50		#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
51		, &dhcp_verbose
52		#endif
53		);
54	argv += optind;	argv += optind;
55	if (!(opt & 1)) { /* no -f */	if (!(opt & 1)) { /* no -f */
56	bb_daemonize_or_rexec(0, argv);	bb_daemonize_or_rexec(0, argv);
57	logmode &= ~LOGMODE_STDIO;	logmode = LOGMODE_NONE;
58	}	}
59	if (opt & 2) { /* -S */	if (opt & 2) { /* -S */
60	openlog(applet_name, LOG_PID, LOG_LOCAL0);	openlog(applet_name, LOG_PID, LOG_DAEMON);
61	logmode |= LOGMODE_SYSLOG;	logmode |= LOGMODE_SYSLOG;
62	}	}
63	#if ENABLE_FEATURE_UDHCP_PORT	#if ENABLE_FEATURE_UDHCP_PORT
64	if (opt & 4) { /* -P */	if (opt & 8) { /* -P */
65	SERVER_PORT = xatou16(str_P);	SERVER_PORT = xatou16(str_P);
66	CLIENT_PORT = SERVER_PORT + 1;	CLIENT_PORT = SERVER_PORT + 1;
67	}	}
#	Line 72  int udhcpd_main(int argc UNUSED_PARAM, c	Line 77  int udhcpd_main(int argc UNUSED_PARAM, c
77
78	/* Create pidfile */	/* Create pidfile */
79	write_pidfile(server_config.pidfile);	write_pidfile(server_config.pidfile);
80	/* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */	/* if (!..) bb_perror_msg("can't create pidfile %s", pidfile); */
81
82	bb_info_msg("%s (v"BB_VER") started", applet_name);	bb_info_msg("%s (v"BB_VER") started", applet_name);
83
84	option = find_option(server_config.options, DHCP_LEASE_TIME);	option = find_option(server_config.options, DHCP_LEASE_TIME);
85	server_config.lease = LEASE_TIME;	server_config.max_lease_sec = LEASE_TIME;
86	if (option) {	if (option) {
87	memcpy(&server_config.lease, option->data + 2, 4);	move_from_unaligned32(server_config.max_lease_sec, option->data + OPT_DATA);
88	server_config.lease = ntohl(server_config.lease);	server_config.max_lease_sec = ntohl(server_config.max_lease_sec);
89	}	}
90
91	/* Sanity check */	/* Sanity check */
#	Line 91  int udhcpd_main(int argc UNUSED_PARAM, c	Line 96  int udhcpd_main(int argc UNUSED_PARAM, c
96	server_config.max_leases = num_ips;	server_config.max_leases = num_ips;
97	}	}
98
99	leases = xzalloc(server_config.max_leases * sizeof(*leases));	g_leases = xzalloc(server_config.max_leases * sizeof(g_leases[0]));
100	read_leases(server_config.lease_file);	read_leases(server_config.lease_file);
101
102	if (udhcp_read_interface(server_config.interface, &server_config.ifindex,	if (udhcp_read_interface(server_config.interface,
103	&server_config.server, server_config.arp)) {	&server_config.ifindex,
104		&server_config.server_nip,
105		server_config.server_mac)
106		) {
107	retval = 1;	retval = 1;
108	goto ret;	goto ret;
109	}	}
#	Line 105  int udhcpd_main(int argc UNUSED_PARAM, c	Line 113  int udhcpd_main(int argc UNUSED_PARAM, c
113
114	timeout_end = monotonic_sec() + server_config.auto_time;	timeout_end = monotonic_sec() + server_config.auto_time;
115	while (1) { /* loop until universe collapses */	while (1) { /* loop until universe collapses */
116		int bytes;
117		struct timeval tv;
118
119	if (server_socket < 0) {	if (server_socket < 0) {
120	server_socket = udhcp_listen_socket(/*INADDR_ANY,*/ SERVER_PORT,	server_socket = udhcp_listen_socket(/*INADDR_ANY,*/ SERVER_PORT,
#	Line 127  int udhcpd_main(int argc UNUSED_PARAM, c	Line 137  int udhcpd_main(int argc UNUSED_PARAM, c
137	continue;	continue;
138	}	}
139	if (retval < 0 && errno != EINTR) {	if (retval < 0 && errno != EINTR) {
140	DEBUG("error on select");	log1("Error on select");
141	continue;	continue;
142	}	}
143
#	Line 141  int udhcpd_main(int argc UNUSED_PARAM, c	Line 151  int udhcpd_main(int argc UNUSED_PARAM, c
151	case SIGTERM:	case SIGTERM:
152	bb_info_msg("Received a SIGTERM");	bb_info_msg("Received a SIGTERM");
153	goto ret0;	goto ret0;
154	case 0: break; /* no signal */	case 0: /* no signal: read a packet */
155	default: continue; /* signal or error (probably EINTR) */	break;
156		default: /* signal or error (probably EINTR): back to select */
157		continue;
158	}	}
159
160	bytes = udhcp_recv_kernel_packet(&packet, server_socket); /* this waits for a packet - idle */	bytes = udhcp_recv_kernel_packet(&packet, server_socket);
161	if (bytes < 0) {	if (bytes < 0) {
162		/* bytes can also be -2 ("bad packet data") */
163	if (bytes == -1 && errno != EINTR) {	if (bytes == -1 && errno != EINTR) {
164	DEBUG("error on read, %s, reopening socket", strerror(errno));	log1("Read error: %s, reopening socket", strerror(errno));
165	close(server_socket);	close(server_socket);
166	server_socket = -1;	server_socket = -1;
167	}	}
168	continue;	continue;
169	}	}
170
171		if (packet.hlen != 6) {
172		bb_error_msg("MAC length != 6, ignoring packet");
173		continue;
174		}
175
176	state = get_option(&packet, DHCP_MESSAGE_TYPE);	state = get_option(&packet, DHCP_MESSAGE_TYPE);
177	if (state == NULL) {	if (state == NULL) {
178	bb_error_msg("cannot get option from packet, ignoring");	bb_error_msg("no message type option, ignoring packet");
179	continue;	continue;
180	}	}
181
182	/* Look for a static lease */	/* Look for a static lease */
183	static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);	static_lease_ip = get_static_nip_by_mac(server_config.static_leases, &packet.chaddr);
184	if (static_lease_ip) {	if (static_lease_ip) {
185	bb_info_msg("Found static lease: %x", static_lease_ip);	bb_info_msg("Found static lease: %x", static_lease_ip);
186
187	memcpy(&static_lease.chaddr, &packet.chaddr, 16);	memcpy(&fake_lease.lease_mac, &packet.chaddr, 6);
188	static_lease.yiaddr = static_lease_ip;	fake_lease.lease_nip = static_lease_ip;
189	static_lease.expires = 0;	fake_lease.expires = 0;
190
191	lease = &static_lease;	lease = &fake_lease;
192	} else {	} else {
193	lease = find_lease_by_chaddr(packet.chaddr);	lease = find_lease_by_mac(packet.chaddr);
194	}	}
195
196	switch (state[0]) {	switch (state[0]) {
197	case DHCPDISCOVER:	case DHCPDISCOVER:
198	DEBUG("Received DISCOVER");	log1("Received DISCOVER");
199
200	if (send_offer(&packet) < 0) {	if (send_offer(&packet) < 0) {
201	bb_error_msg("send OFFER failed");	bb_error_msg("send OFFER failed");
202	}	}
203	break;	break;
204	case DHCPREQUEST:	case DHCPREQUEST: {
205	DEBUG("received REQUEST");	uint8_t *server_id_opt, *requested_opt;
206		uint32_t server_id_net = server_id_net; /* for compiler */
207	requested = get_option(&packet, DHCP_REQUESTED_IP);	uint32_t requested_nip = requested_nip; /* for compiler */
208	server_id = get_option(&packet, DHCP_SERVER_ID);
209		log1("Received REQUEST");
210	if (requested) memcpy(&requested_align, requested, 4);
211	if (server_id) memcpy(&server_id_align, server_id, 4);	requested_opt = get_option(&packet, DHCP_REQUESTED_IP);
212		server_id_opt = get_option(&packet, DHCP_SERVER_ID);
213		if (requested_opt)
214		move_from_unaligned32(requested_nip, requested_opt);
215		if (server_id_opt)
216		move_from_unaligned32(server_id_net, server_id_opt);
217
218	if (lease) {	if (lease) {
219	if (server_id) {	if (server_id_opt) {
220	/* SELECTING State */	/* SELECTING State */
221	DEBUG("server_id = %08x", ntohl(server_id_align));	if (server_id_net == server_config.server_nip
222	if (server_id_align == server_config.server && requested	&& requested_opt
223	&& requested_align == lease->yiaddr	&& requested_nip == lease->lease_nip
224	) {	) {
225	send_ACK(&packet, lease->yiaddr);	send_ACK(&packet, lease->lease_nip);
226	}	}
227	} else if (requested) {	} else if (requested_opt) {
228	/* INIT-REBOOT State */	/* INIT-REBOOT State */
229	if (lease->yiaddr == requested_align)	if (lease->lease_nip == requested_nip)
230	send_ACK(&packet, lease->yiaddr);	send_ACK(&packet, lease->lease_nip);
231	else	else
232	send_NAK(&packet);	send_NAK(&packet);
233	} else if (lease->yiaddr == packet.ciaddr) {	} else if (lease->lease_nip == packet.ciaddr) {
234	/* RENEWING or REBINDING State */	/* RENEWING or REBINDING State */
235	send_ACK(&packet, lease->yiaddr);	send_ACK(&packet, lease->lease_nip);
236	} else { /* don't know what to do!!!! */	} else { /* don't know what to do!!!! */
237	send_NAK(&packet);	send_NAK(&packet);
238	}	}
239
240	/* what to do if we have no record of the client */	/* what to do if we have no record of the client */
241	} else if (server_id) {	} else if (server_id_opt) {
242	/* SELECTING State */	/* SELECTING State */
243
244	} else if (requested) {	} else if (requested_opt) {
245	/* INIT-REBOOT State */	/* INIT-REBOOT State */
246	lease = find_lease_by_yiaddr(requested_align);	lease = find_lease_by_nip(requested_nip);
247	if (lease) {	if (lease) {
248	if (lease_expired(lease)) {	if (is_expired_lease(lease)) {
249	/* probably best if we drop this lease */	/* probably best if we drop this lease */
250	memset(lease->chaddr, 0, 16);	memset(lease->lease_mac, 0, sizeof(lease->lease_mac));
251	/* make some contention for this address */	} else {
252	} else	/* make some contention for this address */
253	send_NAK(&packet);	send_NAK(&packet);
254		}
255	} else {	} else {
256	uint32_t r = ntohl(requested_align);	uint32_t r = ntohl(requested_nip);
257	if (r < server_config.start_ip	if (r < server_config.start_ip
258	|| r > server_config.end_ip	|| r > server_config.end_ip
259	) {	) {
#	Line 243  int udhcpd_main(int argc UNUSED_PARAM, c	Line 266  int udhcpd_main(int argc UNUSED_PARAM, c
266	/* RENEWING or REBINDING State */	/* RENEWING or REBINDING State */
267	}	}
268	break;	break;
269		}
270	case DHCPDECLINE:	case DHCPDECLINE:
271	DEBUG("Received DECLINE");	log1("Received DECLINE");
272	if (lease) {	if (lease) {
273	memset(lease->chaddr, 0, 16);	memset(lease->lease_mac, 0, sizeof(lease->lease_mac));
274	lease->expires = time(0) + server_config.decline_time;	lease->expires = time(NULL) + server_config.decline_time;
275	}	}
276	break;	break;
277	case DHCPRELEASE:	case DHCPRELEASE:
278	DEBUG("Received RELEASE");	log1("Received RELEASE");
279	if (lease)	if (lease)
280	lease->expires = time(0);	lease->expires = time(NULL);
281	break;	break;
282	case DHCPINFORM:	case DHCPINFORM:
283	DEBUG("Received INFORM");	log1("Received INFORM");
284	send_inform(&packet);	send_inform(&packet);
285	break;	break;
286	default:	default:

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