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dhcdrop

    1: /*
    2:  * net_functions.h
    3:  *
    4:  *  Created on: 30.07.2009
    5:  *      Author: Chebotarev Roman
    6:  */
    7: 
    8: #ifndef NET_FUNCTIONS_H_
    9: #define NET_FUNCTIONS_H_
   10: 
   11: #include "net.h"
   12: 
   13: enum packet_types
   14: {
   15: 	dhcp_packet,
   16: 	arp_packet
   17: };
   18: 
   19: /* Return pcap network device if success. Otherwise - exit from programm. */
   20: pcap_t * get_device(const struct config_params * params);
   21: 
   22: /* Calculate CRC for data in 'buffer'. Return checksumm. */
   23: uint16_t rs_crc(const unsigned short *buffer, int length);
   24: 
   25: /* Create ARP header */
   26: void assemble_net_header_arp(struct arp_packet_net_header * net_header,
   27: 		const uint8_t * ether_src,
   28: 		uint16_t op_code);
   29: 
   30: /* Create network header - ethernet + IP + UDP. Store in 'header'. */
   31: void assemble_net_header_dhcp
   32:     (
   33:         struct dhcp_packet_net_header * header,		/* Can't be NULL */
   34: 		const int data_len,						/* Length of UDP data */
   35:         const struct config_params * params,	/* Can't be NULL */
   36:         const uint8_t * ether_src,				/* Source ethernet address. Binary format. Can't be NULL */
   37:         const uint32_t	dst_ip,					/* If zero - using broadcast. */
   38:         const uint32_t	src_ip
   39:         );
   40: 
   41: /* Send packet to network. 'data_len' - only UDP data, exclude network headers */
   42: int send_packet(pcap_t* descr, 			/* Can't be NULL */
   43: 		enum packet_types packet_type,	/* Type of sended packet. Se 'enum packet_types' in dhcdrop_types.h */
   44: 		const uint8_t *snd_data, 		/* UDP payload. Can't be NULL */
   45: 		const int data_len,				/* Payload data length */
   46: 		const struct config_params * params,	/* May be NULL */
   47: 		const uint8_t * ether_src,  	/* Source ethernet address. Can't be NULL */
   48: 		const uint32_t dst_ip);
   49: 
   50: #ifdef  _WIN32
   51: void CALLBACK timeout(UINT uTimerID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2);
   52: #else

   53: void timeout(int signal);
   54: #endif

   55: 
   56: #endif /* NET_FUNCTIONS_H_ */