60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#ifndef PACKET_H_
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#define PACKET_H_
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include "config.h"
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struct dhcpMessage {
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uint8_t op;
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uint8_t htype;
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uint8_t hlen;
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uint8_t hops;
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uint32_t xid;
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uint16_t secs;
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uint16_t flags;
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uint32_t ciaddr;
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uint32_t yiaddr;
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uint32_t siaddr;
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uint32_t giaddr;
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uint8_t chaddr[16];
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uint8_t sname[64];
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uint8_t file[128];
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uint32_t cookie;
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uint8_t options[308]; /* 312 - cookie */
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};
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struct ip_udp_dhcp_packet {
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struct iphdr ip;
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struct udphdr udp;
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struct dhcpMessage data;
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};
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struct udp_dhcp_packet {
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struct udphdr udp;
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struct dhcpMessage data;
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};
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enum {
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IP_UPD_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet),
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UPD_DHCP_SIZE = sizeof(struct udp_dhcp_packet),
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DHCP_SIZE = sizeof(struct dhcpMessage),
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};
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/* Let's see whether compiler understood us right */
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struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
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char c[IP_UPD_DHCP_SIZE == 576 ? 1 : -1];
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};
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int get_packet(struct dhcpMessage *packet, int fd);
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uint16_t checksum(void *addr, int count);
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int raw_packet(struct dhcpMessage *payload, uint32_t source_ip,
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int source_port, uint32_t dest_ip, int dest_port,
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unsigned char *dest_arp, int ifindex);
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int kernel_packet(struct dhcpMessage *payload, uint32_t source_ip,
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int source_port, uint32_t dest_ip, int dest_port);
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void change_listen_mode(struct client_state_t *cs, int new_mode);
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void handle_packet(struct client_state_t *cs);
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#endif
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