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150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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* network.h
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*
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* Created on: Jul 29, 2017
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* Author: wangyu
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*/
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#ifndef UDP2RAW_NETWORK_H_
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#define UDP2RAW_NETWORK_H_
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extern int raw_recv_fd;
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extern int raw_send_fd;
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extern int seq_mode;
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extern int max_seq_mode;
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extern int filter_port;
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//extern u32_t bind_address_uint32;
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extern int disable_bpf_filter;
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extern int lower_level;
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extern int lower_level_manual;
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extern char if_name[100];
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extern char dev[100];
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extern unsigned char dest_hw_addr[];
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extern int random_drop;
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extern int ifindex;
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extern char g_packet_buf[buf_len];
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extern int g_packet_buf_len;
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extern int g_packet_buf_cnt;
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struct icmphdr
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{
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uint8_t type;
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uint8_t code;
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uint16_t check_sum;
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uint16_t id;
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uint16_t seq;
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};
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struct pseudo_header {
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u_int32_t source_address;
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u_int32_t dest_address;
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u_int8_t placeholder;
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u_int8_t protocol;
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u_int16_t tcp_length;
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};
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struct packet_info_t //todo change this to union
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{
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uint8_t protocol;
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//ip_part:
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u32_t src_ip;
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uint16_t src_port;
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u32_t dst_ip;
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uint16_t dst_port;
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//tcp_part:
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bool syn,ack,psh,rst;
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u32_t seq,ack_seq;
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u32_t ack_seq_counter;
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u32_t ts,ts_ack;
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uint16_t icmp_seq;
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bool has_ts;
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sockaddr_ll addr_ll;
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i32_t data_len;
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packet_info_t();
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};
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struct raw_info_t
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{
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packet_info_t send_info;
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packet_info_t recv_info;
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//int last_send_len;
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//int last_recv_len;
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u32_t reserved_send_seq;
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//uint32_t first_seq,first_ack_seq;
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int rst_received=0;
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bool disabled=0;
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};//g_raw_info;
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int init_raw_socket();
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void init_filter(int port);
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void remove_filter();
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int init_ifindex(const char * if_name,int fd,int &index);
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int find_lower_level_info(u32_t ip,u32_t &dest_ip,string &if_name,string &hw);
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int get_src_adress(u32_t &ip,u32_t remote_ip_uint32,int remote_port); //a trick to get src adress for a dest adress,so that we can use the src address in raw socket as source ip
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int get_src_adress2(address_t &output_addr,address_t remote_addr);
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int try_to_list_and_bind(int & bind_fd,u32_t local_ip_uint32,int port); //try to bind to a port,may fail.
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int client_bind_to_a_new_port(int & bind_fd,u32_t local_ip_uint32);//find a free port and bind to it.
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int client_bind_to_a_new_port2(int &fd,const address_t& address);
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int discard_raw_packet();
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int pre_recv_raw_packet();
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int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen);
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int peek_raw(packet_info_t &peek_info);
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int recv_raw_ip(raw_info_t &raw_info,char * &payload,int &payloadlen);
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int send_raw_icmp(raw_info_t &raw_info, const char * payload, int payloadlen);
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int send_raw_udp(raw_info_t &raw_info, const char * payload, int payloadlen);
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int send_raw_tcp(raw_info_t &raw_info,const char * payload, int payloadlen);
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int recv_raw_icmp(raw_info_t &raw_info, char *&payload, int &payloadlen);
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int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen);
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int recv_raw_tcp(raw_info_t &raw_info,char * &payload,int &payloadlen);
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//int send_raw(raw_info_t &raw_info,const char * payload,int payloadlen);
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//int recv_raw(raw_info_t &raw_info,char * &payload,int &payloadlen);
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int send_raw0(raw_info_t &raw_info,const char * payload,int payloadlen);
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int recv_raw0(raw_info_t &raw_info,char * &payload,int &payloadlen);
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int after_send_raw0(raw_info_t &raw_info);
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int after_recv_raw0(raw_info_t &raw_info);
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#endif /* NETWORK_H_ */
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