udp2raw/network.h
2023-02-07 07:11:49 -05:00

311 lines
7.2 KiB
C

/*
* network.h
*
* Created on: Jul 29, 2017
* Author: wangyu
*/
#ifndef UDP2RAW_NETWORK_H_
#define UDP2RAW_NETWORK_H_
extern int raw_recv_fd;
extern int raw_send_fd;
extern int use_tcp_dummy_socket;
extern int seq_mode;
extern int max_seq_mode;
extern int filter_port;
// extern u32_t bind_address_uint32;
extern int disable_bpf_filter;
extern int lower_level;
extern int lower_level_manual;
extern char if_name[100];
extern char dev[100];
extern unsigned char dest_hw_addr[];
extern int random_drop;
extern int ifindex;
extern char g_packet_buf[huge_buf_len];
extern int g_packet_buf_len;
extern int g_packet_buf_cnt;
#ifdef UDP2RAW_MP
extern queue_t my_queue;
extern ev_async async_watcher;
extern struct ev_loop *g_default_loop;
extern pthread_mutex_t queue_mutex;
extern int use_pcap_mutex;
extern int pcap_cnt;
extern int pcap_link_header_len;
extern int send_with_pcap;
extern int pcap_header_captured;
extern int pcap_header_buf[buf_len];
struct icmphdr {
uint8_t type;
uint8_t code;
uint16_t check_sum;
uint16_t id;
uint16_t seq;
};
#endif
struct my_iphdr {
#ifdef UDP2RAW_LITTLE_ENDIAN
unsigned char ihl : 4;
unsigned char version : 4;
#else
unsigned char version : 4;
unsigned char ihl : 4;
#endif
u_int8_t tos;
u_int16_t tot_len;
u_int16_t id;
u_int16_t frag_off;
u_int8_t ttl;
u_int8_t protocol;
u_int16_t check;
u_int32_t saddr;
u_int32_t daddr;
/*The options start here. */
};
struct my_udphdr {
/*__extension__*/ union {
struct
{
u_int16_t uh_sport; /* source port */
u_int16_t uh_dport; /* destination port */
u_int16_t uh_ulen; /* udp length */
u_int16_t uh_sum; /* udp checksum */
};
struct
{
u_int16_t source;
u_int16_t dest;
u_int16_t len;
u_int16_t check;
};
};
};
struct my_tcphdr {
/*__extension__*/ union {
struct
{
u_int16_t th_sport; /* source port */
u_int16_t th_dport; /* destination port */
u_int32_t th_seq; /* sequence number */
u_int32_t th_ack; /* acknowledgement number */
#ifdef UDP2RAW_LITTLE_ENDIAN
u_int8_t th_x2 : 4; /* (unused) */
u_int8_t tc_off : 4; /* data offset */
#else
u_int8_t th_off : 4; /* data offset */
u_int8_t th_x2 : 4; /* (unused) */
#endif
u_int8_t th_flags;
#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
u_int16_t th_win; /* window */
u_int16_t th_sum; /* checksum */
u_int16_t th_urp; /* urgent pointer */
};
struct
{
u_int16_t source;
u_int16_t dest;
u_int32_t seq;
u_int32_t ack_seq;
#ifdef UDP2RAW_LITTLE_ENDIAN
u_int16_t res1 : 4;
u_int16_t doff : 4;
u_int16_t fin : 1;
u_int16_t syn : 1;
u_int16_t rst : 1;
u_int16_t psh : 1;
u_int16_t ack : 1;
u_int16_t urg : 1;
u_int16_t res2 : 2;
#else
u_int16_t doff : 4;
u_int16_t res1 : 4;
u_int16_t res2 : 2;
u_int16_t urg : 1;
u_int16_t ack : 1;
u_int16_t psh : 1;
u_int16_t rst : 1;
u_int16_t syn : 1;
u_int16_t fin : 1;
#endif
u_int16_t window;
u_int16_t check;
u_int16_t urg_ptr;
};
};
};
struct my_ip6hdr {
#ifdef UDP2RAW_LITTLE_ENDIAN
uint8_t traffic_class_high : 4;
uint8_t version : 4;
uint8_t flow_label_high : 4;
uint8_t traffic_class_low : 4;
#else
uint8_t version : 4;
uint8_t traffic_class_high : 4;
uint8_t traffic_class_low : 4;
uint8_t flow_label_high : 4;
#endif
u_int16_t flow_label_low;
u_int16_t payload_len;
uint8_t next_header;
uint8_t hop_limit;
struct in6_addr src;
struct in6_addr dst;
};
struct my_icmphdr {
uint8_t type;
uint8_t code;
uint16_t check_sum;
uint16_t id;
uint16_t seq;
};
struct pseudo_header {
u_int32_t source_address;
u_int32_t dest_address;
u_int8_t placeholder;
u_int8_t protocol;
u_int16_t tcp_length;
};
struct pseudo_header6 {
struct in6_addr src;
struct in6_addr dst;
u_int32_t tcp_length;
u_int16_t placeholder1;
u_int8_t placeholder2;
u_int8_t next_header;
};
struct packet_info_t // todo change this to union
{
uint8_t protocol;
// u32_t src_ip;
// u32_t dst_ip;
my_ip_t new_src_ip;
my_ip_t new_dst_ip;
uint16_t src_port;
uint16_t dst_port;
// tcp_part:
bool syn, ack, psh, rst;
u32_t seq, ack_seq;
u32_t ack_seq_counter;
u32_t ts, ts_ack;
uint16_t my_icmp_seq;
bool has_ts;
#ifdef UDP2RAW_LINUX
sockaddr_ll addr_ll;
#endif
i32_t data_len;
packet_info_t();
};
struct raw_info_t {
packet_info_t send_info;
packet_info_t recv_info;
// int last_send_len;
// int last_recv_len;
bool peek = 0;
// bool csum=1;
u32_t reserved_send_seq;
// uint32_t first_seq,first_ack_seq;
int rst_received = 0;
bool disabled = 0;
}; // g_raw_info;
int init_raw_socket();
void init_filter(int port);
void remove_filter();
#ifdef UDP2RAW_LINUX
int init_ifindex(const char *if_name, int fd, int &index);
#endif
#ifdef UDP2RAW_MP
int init_ifindex(const char *if_name, int &index);
#endif
int find_lower_level_info(u32_t ip, u32_t &dest_ip, string &if_name, string &hw);
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
int get_src_adress2(address_t &output_addr, address_t remote_addr);
int try_to_list_and_bind(int &bind_fd, u32_t local_ip_uint32, int port); // try to bind to a port,may fail.
int try_to_list_and_bind2(int &fd, address_t address);
int client_bind_to_a_new_port(int &bind_fd, u32_t local_ip_uint32); // find a free port and bind to it.
int client_bind_to_a_new_port2(int &fd, const address_t &address);
int discard_raw_packet();
int pre_recv_raw_packet();
int send_raw_ip(raw_info_t &raw_info, const char *payload, int payloadlen);
int peek_raw(raw_info_t &peek_info);
int recv_raw_ip(raw_info_t &raw_info, char *&payload, int &payloadlen);
int send_raw_icmp(raw_info_t &raw_info, const char *payload, int payloadlen);
int send_raw_udp(raw_info_t &raw_info, const char *payload, int payloadlen);
int send_raw_tcp(raw_info_t &raw_info, const char *payload, int payloadlen);
int recv_raw_icmp(raw_info_t &raw_info, char *&payload, int &payloadlen);
int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen);
int recv_raw_tcp(raw_info_t &raw_info, char *&payload, int &payloadlen);
// int send_raw(raw_info_t &raw_info,const char * payload,int payloadlen);
// int recv_raw(raw_info_t &raw_info,char * &payload,int &payloadlen);
int send_raw0(raw_info_t &raw_info, const char *payload, int payloadlen);
int recv_raw0(raw_info_t &raw_info, char *&payload, int &payloadlen);
int after_send_raw0(raw_info_t &raw_info);
int after_recv_raw0(raw_info_t &raw_info);
#endif /* NETWORK_H_ */