Add initial support for DHCP client library

1 files changed, 173 insertions, 0 deletions

diff --git a/gdhcp/common.h b/gdhcp/common.h
new file mode 100644
index 00000000..ade49cd2
--- /dev/null
+++ b/gdhcp/common.h
@@ -0,0 +1,173 @@
+/*
+ *
+ *  DHCP client library with GLib integration
+ *
+ *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+
+#include <glib.h>
+
+#include "gdhcp.h"
+
+#define dhcp_get_unaligned(ptr)			\
+({						\
+	struct __attribute__((packed)) {	\
+		typeof(*(ptr)) __v;		\
+	} *__p = (void *) (ptr);		\
+	__p->__v;				\
+})
+
+#define dhcp_put_unaligned(val, ptr)		\
+do {						\
+	struct __attribute__((packed)) {	\
+		typeof(*(ptr)) __v;		\
+	} *__p = (void *) (ptr);		\
+	__p->__v = (val);			\
+} while (0)
+
+#define CLIENT_PORT 68
+#define SERVER_PORT 67
+
+#define EXTEND_FOR_BUGGY_SERVERS 80
+
+static const uint8_t MAC_BCAST_ADDR[6] __attribute__((aligned(2))) = {
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+/* DHCP packet */
+#define DHCP_MAGIC              0x63825363
+#define DHCP_OPTIONS_BUFSIZE    308
+#define BOOTREQUEST             1
+#define BOOTREPLY               2
+
+#define BROADCAST_FLAG		0x8000
+
+/* See RFC 2131 */
+struct dhcp_packet {
+	uint8_t op;
+	uint8_t htype;
+	uint8_t hlen;
+	uint8_t hops;
+	uint32_t xid;
+	uint16_t secs;
+	uint16_t flags;
+	uint32_t ciaddr;
+	uint32_t yiaddr;
+	uint32_t siaddr_nip;
+	uint32_t gateway_nip;
+	uint8_t chaddr[16];
+	uint8_t sname[64];
+	uint8_t file[128];
+	uint32_t cookie;
+	uint8_t options[DHCP_OPTIONS_BUFSIZE + EXTEND_FOR_BUGGY_SERVERS];
+} __attribute__((packed));
+
+struct ip_udp_dhcp_packet {
+	struct iphdr ip;
+	struct udphdr udp;
+	struct dhcp_packet data;
+} __attribute__((packed));
+
+/* See RFC 2132 */
+#define DHCP_PADDING		0x00
+#define DHCP_SUBNET		0x01
+#define DHCP_ROUTER		0x03
+#define DHCP_TIME_SERVER	0x04
+#define DHCP_NAME_SERVER	0x05
+#define DHCP_DNS_SERVER		0x06
+#define DHCP_HOST_NAME		0x0c
+#define DHCP_DOMAIN_NAME	0x0f
+#define DHCP_NTP_SERVER		0x2a
+#define DHCP_REQUESTED_IP	0x32
+#define DHCP_LEASE_TIME		0x33
+#define DHCP_OPTION_OVERLOAD	0x34
+#define DHCP_MESSAGE_TYPE	0x35
+#define DHCP_SERVER_ID		0x36
+#define DHCP_PARAM_REQ		0x37
+#define DHCP_ERR_MESSAGE	0x38
+#define DHCP_MAX_SIZE		0x39
+#define DHCP_VENDOR		0x3c
+#define DHCP_CLIENT_ID		0x3d
+#define DHCP_END		0xff
+
+#define OPT_CODE		0
+#define OPT_LEN			1
+#define OPT_DATA		2
+#define OPTION_FIELD		0
+#define FILE_FIELD		1
+#define SNAME_FIELD		2
+
+/* DHCP_MESSAGE_TYPE values */
+#define DHCPDISCOVER		1
+#define DHCPOFFER		2
+#define DHCPREQUEST		3
+#define DHCPDECLINE		4
+#define DHCPACK			5
+#define DHCPNAK			6
+#define DHCPRELEASE		7
+#define DHCPINFORM		8
+#define DHCP_MINTYPE DHCPDISCOVER
+#define DHCP_MAXTYPE DHCPINFORM
+
+typedef enum {
+	OPTION_UNKNOWN,
+	OPTION_IP,
+	OPTION_STRING,
+	OPTION_U8,
+	OPTION_U16,
+	OPTION_U32,
+	OPTION_TYPE_MASK = 0x0f,
+	OPTION_LIST = 0x10,
+} GDHCPOptionType;
+
+typedef struct dhcp_option {
+	GDHCPOptionType type;
+	uint8_t code;
+} DHCPOption;
+
+/* Length of the option types in binary form */
+static const uint8_t dhcp_option_lengths[] = {
+	[OPTION_IP]	= 4,
+	[OPTION_STRING]	= 1,
+	[OPTION_U8]	= 1,
+	[OPTION_U16]	= 2,
+	[OPTION_U32]	= 4,
+};
+
+uint8_t *dhcp_get_option(struct dhcp_packet *packet, int code);
+int dhcp_end_option(uint8_t *optionptr);
+void dhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt);
+void dhcp_add_simple_option(struct dhcp_packet *packet,
+				uint8_t code, uint32_t data);
+GDHCPOptionType dhcp_get_code_type(uint8_t code);
+
+uint16_t dhcp_checksum(void *addr, int count);
+
+void dhcp_init_header(struct dhcp_packet *packet, char type);
+
+int dhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
+			uint32_t source_ip, int source_port,
+			uint32_t dest_ip, int dest_port,
+			const uint8_t *dest_arp, int ifindex) ;
+int dhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
+			uint32_t source_ip, int source_port,
+			uint32_t dest_ip, int dest_port) ;
+int dhcp_l3_socket(int port, const char *interface);
+int dhcp_recv_l3_packet(struct dhcp_packet *packet, int fd);