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tuntcp.h
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tuntcp.h
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#ifndef TUNTCP_H
#define TUNTCP_H
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <netdb.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#define PROTO_ICMP 1
#define PROTO_TCP 6
#define PROTO_UDP 17
#define TCP_FIN 1
#define TCP_SYN 2
#define TCP_RST 4
#define TCP_PSH 8
#define TCP_ACK 16
#define TCP_URG 32
#define TCP_ECE 64
#define TCP_CWR 128
typedef struct {
uint8_t version_ihl;
uint8_t tos;
uint16_t len;
uint16_t id;
uint16_t frag_offset;
uint8_t ttl;
uint8_t proto;
uint16_t checksum;
uint32_t saddr;
uint32_t daddr;
} iphdr;
typedef struct {
uint8_t type;
uint8_t code;
uint16_t checksum;
uint16_t id;
uint16_t seq;
} icmpecho;
typedef struct {
uint16_t sport;
uint16_t dport;
uint16_t len;
uint16_t checksum;
} udphdr;
typedef struct {
uint32_t src;
uint32_t dst;
uint8_t zero;
uint8_t proto;
uint16_t plen; // packet length - header + data
} pseudohdr;
typedef struct {
uint16_t sport;
uint16_t dport;
uint32_t seq;
uint32_t ack;
uint8_t rsvd_offset;
uint8_t flags;
uint16_t win;
uint16_t checksum;
uint16_t urp;
} tcphdr;
typedef enum {
LISTEN,
SYN_SENT,
SYN_RECEIVED,
ESTABLISHED,
FIN_WAIT_1,
FIN_WAIT_2,
CLOSE_WAIT,
CLOSING,
LAST_ACK,
TIME_WAIT,
CLOSED
} tcpstate;
typedef struct {
char buf[65535];
int readptr; // number of bytes read
int available; // number of bytes written
} tcpdata;
// All values stored in Host Order
typedef struct {
int tunfd;
tcpstate state;
uint32_t saddr;
uint16_t sport;
uint32_t daddr;
uint16_t dport;
uint32_t seq;
uint32_t ack;
tcpdata rcvd;
} tcpconn;
typedef union {
struct ping {
iphdr ip;
icmpecho echo;
char data[56];
} ping;
struct pseudo {
pseudohdr ip;
char data[520]; // TCP/UDP header + data
} pseudo;
struct udp {
iphdr ip;
udphdr hdr;
char data[512];
} udp;
struct tcp {
iphdr ip;
tcphdr hdr;
char data[1460]; // Includes options
} tcp;
} packet;
int tuntcp_socket(int domain, int type, int protocol);
int tuntcp_connect(int sockfd, int tunfd, struct sockaddr *addr, int addrlen);
ssize_t tuntcp_send(int sockfd, void *buf, size_t len);
ssize_t tuntcp_recv(int sockfd, void *buf, size_t len);
int tuntcp_close(int sockfd);
int open_tun(char *dev);
void hexdump(const void *data, int len);
#endif // TUNTCP_H