udhcp: merge clientpacket.c into dhcpc.c

function                                             old     new   delta
udhcpc_main                                         2569    2855    +286
perform_release                                      122     124      +2
client_background                                     31      32      +1
init_packet                                          156      88     -68
send_decline                                         114       -    -114
send_discover                                        121       -    -121
send_select                                          130       -    -130
------------------------------------------------------------------------------
(add/remove: 0/4 grow/shrink: 3/1 up/down: 289/-433)         Total: -144 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 0 insertions, 272 deletions

diff --git a/networking/udhcp/clientpacket.c b/networking/udhcp/clientpacket.c
deleted file mode 100644
index b4a75be02..000000000
--- a/networking/udhcp/clientpacket.c
+++ /dev/null
@@ -1,272 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/* clientpacket.c
- *
- * Packet generation and dispatching functions for the DHCP client.
- *
- * 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 "dhcpc.h"
-#include "options.h"
-
-//#include <features.h>
-#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-
-
-/* Create a random xid */
-uint32_t FAST_FUNC random_xid(void)
-{
-	static smallint initialized;
-
-	if (!initialized) {
-		srand(monotonic_us());
-		initialized = 1;
-	}
-	return rand();
-}
-
-
-/* Initialize the packet with the proper defaults */
-static void init_packet(struct dhcp_packet *packet, char type)
-{
-	udhcp_init_header(packet, type);
-	memcpy(packet->chaddr, client_config.client_mac, 6);
-	if (client_config.clientid)
-		add_option_string(packet->options, client_config.clientid);
-	if (client_config.hostname)
-		add_option_string(packet->options, client_config.hostname);
-	if (client_config.fqdn)
-		add_option_string(packet->options, client_config.fqdn);
-	if (type != DHCPDECLINE
-	 && type != DHCPRELEASE
-	 && client_config.vendorclass
-	) {
-		add_option_string(packet->options, client_config.vendorclass);
-	}
-}
-
-
-/* Add a parameter request list for stubborn DHCP servers. Pull the data
- * from the struct in options.c. Don't do bounds checking here because it
- * goes towards the head of the packet. */
-static void add_param_req_option(struct dhcp_packet *packet)
-{
-	uint8_t c;
-	int end = end_option(packet->options);
-	int i, len = 0;
-
-	for (i = 0; (c = dhcp_options[i].code) != 0; i++) {
-		if ((   (dhcp_options[i].flags & OPTION_REQ)
-		     && !client_config.no_default_options
-		    )
-		 || (client_config.opt_mask[c >> 3] & (1 << (c & 7)))
-		) {
-			packet->options[end + OPT_DATA + len] = c;
-			len++;
-		}
-	}
-	if (len) {
-		packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
-		packet->options[end + OPT_LEN] = len;
-		packet->options[end + OPT_DATA + len] = DHCP_END;
-	}
-}
-
-/* RFC 2131
- * 4.4.4 Use of broadcast and unicast
- *
- * The DHCP client broadcasts DHCPDISCOVER, DHCPREQUEST and DHCPINFORM
- * messages, unless the client knows the address of a DHCP server.
- * The client unicasts DHCPRELEASE messages to the server. Because
- * the client is declining the use of the IP address supplied by the server,
- * the client broadcasts DHCPDECLINE messages.
- *
- * When the DHCP client knows the address of a DHCP server, in either
- * INIT or REBOOTING state, the client may use that address
- * in the DHCPDISCOVER or DHCPREQUEST rather than the IP broadcast address.
- * The client may also use unicast to send DHCPINFORM messages
- * to a known DHCP server. If the client receives no response to DHCP
- * messages sent to the IP address of a known DHCP server, the DHCP
- * client reverts to using the IP broadcast address.
- */
-
-static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet)
-{
-	return udhcp_send_raw_packet(packet,
-		/*src*/ INADDR_ANY, CLIENT_PORT,
-		/*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR,
-		client_config.ifindex);
-}
-
-
-/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
-int FAST_FUNC send_discover(uint32_t xid, uint32_t requested)
-{
-	struct dhcp_packet packet;
-
-	init_packet(&packet, DHCPDISCOVER);
-	packet.xid = xid;
-	if (requested)
-		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	/* Explicitly saying that we want RFC-compliant packets helps
-	 * some buggy DHCP servers to NOT send bigger packets */
-	add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
-	add_param_req_option(&packet);
-
-	bb_info_msg("Sending discover...");
-	return raw_bcast_from_client_config_ifindex(&packet);
-}
-
-
-/* Broadcast a DHCP request message */
-/* RFC 2131 3.1 paragraph 3:
- * "The client _broadcasts_ a DHCPREQUEST message..."
- */
-int FAST_FUNC send_select(uint32_t xid, uint32_t server, uint32_t requested)
-{
-	struct dhcp_packet packet;
-	struct in_addr addr;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-	add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	add_simple_option(packet.options, DHCP_SERVER_ID, server);
-	add_param_req_option(&packet);
-
-	addr.s_addr = requested;
-	bb_info_msg("Sending select for %s...", inet_ntoa(addr));
-	return raw_bcast_from_client_config_ifindex(&packet);
-}
-
-
-/* Unicast or broadcast a DHCP renew message */
-int FAST_FUNC send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
-{
-	struct dhcp_packet packet;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-	packet.ciaddr = ciaddr;
-	add_param_req_option(&packet);
-
-	bb_info_msg("Sending renew...");
-	if (server)
-		return udhcp_send_kernel_packet(&packet,
-			ciaddr, CLIENT_PORT,
-			server, SERVER_PORT);
-	return raw_bcast_from_client_config_ifindex(&packet);
-}
-
-
-#if ENABLE_FEATURE_UDHCPC_ARPING
-/* Broadcast a DHCP decline message */
-int FAST_FUNC send_decline(uint32_t xid, uint32_t server, uint32_t requested)
-{
-	struct dhcp_packet packet;
-
-	init_packet(&packet, DHCPDECLINE);
-	packet.xid = xid;
-	add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	add_simple_option(packet.options, DHCP_SERVER_ID, server);
-
-	bb_info_msg("Sending decline...");
-	return raw_bcast_from_client_config_ifindex(&packet);
-}
-#endif
-
-
-/* Unicast a DHCP release message */
-int FAST_FUNC send_release(uint32_t server, uint32_t ciaddr)
-{
-	struct dhcp_packet packet;
-
-	init_packet(&packet, DHCPRELEASE);
-	packet.xid = random_xid();
-	packet.ciaddr = ciaddr;
-
-	add_simple_option(packet.options, DHCP_SERVER_ID, server);
-
-	bb_info_msg("Sending release...");
-	return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
-}
-
-
-/* Returns -1 on errors that are fatal for the socket, -2 for those that aren't */
-int FAST_FUNC udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd)
-{
-	int bytes;
-	struct ip_udp_dhcp_packet packet;
-	uint16_t check;
-
-	memset(&packet, 0, sizeof(packet));
-	bytes = safe_read(fd, &packet, sizeof(packet));
-	if (bytes < 0) {
-		log1("Packet read error, ignoring");
-		/* NB: possible down interface, etc. Caller should pause. */
-		return bytes; /* returns -1 */
-	}
-
-	if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp))) {
-		log1("Packet is too short, ignoring");
-		return -2;
-	}
-
-	if (bytes < ntohs(packet.ip.tot_len)) {
-		/* packet is bigger than sizeof(packet), we did partial read */
-		log1("Oversized packet, ignoring");
-		return -2;
-	}
-
-	/* ignore any extra garbage bytes */
-	bytes = ntohs(packet.ip.tot_len);
-
-	/* make sure its the right packet for us, and that it passes sanity checks */
-	if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION
-	 || packet.ip.ihl != (sizeof(packet.ip) >> 2)
-	 || packet.udp.dest != htons(CLIENT_PORT)
-	/* || bytes > (int) sizeof(packet) - can't happen */
-	 || ntohs(packet.udp.len) != (uint16_t)(bytes - sizeof(packet.ip))
-	) {
-		log1("Unrelated/bogus packet, ignoring");
-		return -2;
-	}
-
-	/* verify IP checksum */
-	check = packet.ip.check;
-	packet.ip.check = 0;
-	if (check != udhcp_checksum(&packet.ip, sizeof(packet.ip))) {
-		log1("Bad IP header checksum, ignoring");
-		return -2;
-	}
-
-	/* verify UDP checksum. IP header has to be modified for this */
-	memset(&packet.ip, 0, offsetof(struct iphdr, protocol));
-	/* ip.xx fields which are not memset: protocol, check, saddr, daddr */
-	packet.ip.tot_len = packet.udp.len; /* yes, this is needed */
-	check = packet.udp.check;
-	packet.udp.check = 0;
-	if (check && check != udhcp_checksum(&packet, bytes)) {
-		log1("Packet with bad UDP checksum received, ignoring");
-		return -2;
-	}
-
-	memcpy(dhcp_pkt, &packet.data, bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
-
-	if (dhcp_pkt->cookie != htonl(DHCP_MAGIC)) {
-		bb_info_msg("Packet with bad magic, ignoring");
-		return -2;
-	}
-	log1("Got valid DHCP packet");
-	udhcp_dump_packet(dhcp_pkt);
-	return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
-}