Correcting tag name to be like previous ones1_3_0

1 files changed, 226 insertions, 0 deletions

diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
new file mode 100644
index 0000000..7438036
--- /dev/null
+++ b/networking/udhcp/dhcpd.c
@@ -0,0 +1,226 @@
+/* vi: set sw=4 ts=4: */
+/* dhcpd.c
+ *
+ * udhcp Server
+ * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
+ *			Chris Trew <ctrew@moreton.com.au>
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "common.h"
+#include "dhcpd.h"
+#include "options.h"
+
+
+/* globals */
+struct dhcpOfferedAddr *leases;
+struct server_config_t server_config;
+
+
+int udhcpd_main(int argc, char *argv[])
+{
+	fd_set rfds;
+	struct timeval tv;
+	int server_socket = -1, bytes, retval, max_sock;
+	struct dhcpMessage packet;
+	uint8_t *state, *server_id, *requested;
+	uint32_t server_id_align, requested_align, static_lease_ip;
+	unsigned long timeout_end, num_ips;
+	struct option_set *option;
+	struct dhcpOfferedAddr *lease, static_lease;
+
+	read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
+
+	/* Start the log, sanitize fd's, and write a pid file */
+	udhcp_start_log_and_pid(server_config.pidfile);
+
+	if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) {
+		memcpy(&server_config.lease, option->data + 2, 4);
+		server_config.lease = ntohl(server_config.lease);
+	}
+	else server_config.lease = LEASE_TIME;
+
+	/* Sanity check */
+	num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1;
+	if (server_config.max_leases > num_ips) {
+		bb_error_msg("max_leases value (%lu) not sane, "
+			"setting to %lu instead",
+			server_config.max_leases, num_ips);
+		server_config.max_leases = num_ips;
+	}
+
+	leases = xzalloc(server_config.max_leases * sizeof(struct dhcpOfferedAddr));
+	read_leases(server_config.lease_file);
+
+	if (read_interface(server_config.interface, &server_config.ifindex,
+			   &server_config.server, server_config.arp) < 0)
+		return 1;
+
+	if (!ENABLE_FEATURE_UDHCP_DEBUG)
+		udhcp_background(server_config.pidfile); /* hold lock during fork. */
+
+	/* Setup the signal pipe */
+	udhcp_sp_setup();
+
+	timeout_end = time(0) + server_config.auto_time;
+	while (1) { /* loop until universe collapses */
+
+		if (server_socket < 0) {
+			server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface);
+			if (server_socket < 0) {
+				bb_perror_msg("FATAL: cannot create server socket");
+				return 2;
+			}
+		}
+
+		max_sock = udhcp_sp_fd_set(&rfds, server_socket);
+		if (server_config.auto_time) {
+			tv.tv_sec = timeout_end - time(0);
+			tv.tv_usec = 0;
+		}
+		if (!server_config.auto_time || tv.tv_sec > 0) {
+			retval = select(max_sock + 1, &rfds, NULL, NULL,
+					server_config.auto_time ? &tv : NULL);
+		} else retval = 0; /* If we already timed out, fall through */
+
+		if (retval == 0) {
+			write_leases();
+			timeout_end = time(0) + server_config.auto_time;
+			continue;
+		} else if (retval < 0 && errno != EINTR) {
+			DEBUG("error on select");
+			continue;
+		}
+
+		switch (udhcp_sp_read(&rfds)) {
+		case SIGUSR1:
+			bb_info_msg("Received a SIGUSR1");
+			write_leases();
+			/* why not just reset the timeout, eh */
+			timeout_end = time(0) + server_config.auto_time;
+			continue;
+		case SIGTERM:
+			bb_info_msg("Received a SIGTERM");
+			return 0;
+		case 0: break;		/* no signal */
+		default: continue;	/* signal or error (probably EINTR) */
+		}
+
+		if ((bytes = udhcp_get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */
+			if (bytes == -1 && errno != EINTR) {
+				DEBUG("error on read, %s, reopening socket", strerror(errno));
+				close(server_socket);
+				server_socket = -1;
+			}
+			continue;
+		}
+
+		if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
+			bb_error_msg("cannot get option from packet, ignoring");
+			continue;
+		}
+
+		/* Look for a static lease */
+		static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);
+
+		if (static_lease_ip) {
+			bb_info_msg("Found static lease: %x", static_lease_ip);
+
+			memcpy(&static_lease.chaddr, &packet.chaddr, 16);
+			static_lease.yiaddr = static_lease_ip;
+			static_lease.expires = 0;
+
+			lease = &static_lease;
+
+		} else {
+			lease = find_lease_by_chaddr(packet.chaddr);
+		}
+
+		switch (state[0]) {
+		case DHCPDISCOVER:
+			DEBUG("Received DISCOVER");
+
+			if (sendOffer(&packet) < 0) {
+				bb_error_msg("send OFFER failed");
+			}
+			break;
+		case DHCPREQUEST:
+			DEBUG("received REQUEST");
+
+			requested = get_option(&packet, DHCP_REQUESTED_IP);
+			server_id = get_option(&packet, DHCP_SERVER_ID);
+
+			if (requested) memcpy(&requested_align, requested, 4);
+			if (server_id) memcpy(&server_id_align, server_id, 4);
+
+			if (lease) {
+				if (server_id) {
+					/* SELECTING State */
+					DEBUG("server_id = %08x", ntohl(server_id_align));
+					if (server_id_align == server_config.server && requested &&
+					    requested_align == lease->yiaddr) {
+						sendACK(&packet, lease->yiaddr);
+					}
+				} else {
+					if (requested) {
+						/* INIT-REBOOT State */
+						if (lease->yiaddr == requested_align)
+							sendACK(&packet, lease->yiaddr);
+						else sendNAK(&packet);
+					} else {
+						/* RENEWING or REBINDING State */
+						if (lease->yiaddr == packet.ciaddr)
+							sendACK(&packet, lease->yiaddr);
+						else {
+							/* don't know what to do!!!! */
+							sendNAK(&packet);
+						}
+					}
+				}
+
+			/* what to do if we have no record of the client */
+			} else if (server_id) {
+				/* SELECTING State */
+
+			} else if (requested) {
+				/* INIT-REBOOT State */
+				if ((lease = find_lease_by_yiaddr(requested_align))) {
+					if (lease_expired(lease)) {
+						/* probably best if we drop this lease */
+						memset(lease->chaddr, 0, 16);
+					/* make some contention for this address */
+					} else sendNAK(&packet);
+				} else if (requested_align < server_config.start ||
+					   requested_align > server_config.end) {
+					sendNAK(&packet);
+				} /* else remain silent */
+
+			} else {
+				 /* RENEWING or REBINDING State */
+			}
+			break;
+		case DHCPDECLINE:
+			DEBUG("Received DECLINE");
+			if (lease) {
+				memset(lease->chaddr, 0, 16);
+				lease->expires = time(0) + server_config.decline_time;
+			}
+			break;
+		case DHCPRELEASE:
+			DEBUG("Received RELEASE");
+			if (lease) lease->expires = time(0);
+			break;
+		case DHCPINFORM:
+			DEBUG("Received INFORM");
+			send_inform(&packet);
+			break;
+		default:
+			bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]);
+		}
+	}
+
+	return 0;
+}