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https://github.com/bol-van/zapret.git
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89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
#pragma once
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#include "checksum.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/tcp.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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// returns netorder value
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uint32_t net32_add(uint32_t netorder_value, uint32_t cpuorder_increment);
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#define TCP_FOOL_NONE 0
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#define TCP_FOOL_MD5SIG 1
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#define TCP_FOOL_BADSUM 2
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#define TCP_FOOL_TS 4
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#define TCP_FOOL_BADSEQ 8
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#define SCALE_NONE ((uint8_t)-1)
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// seq and wsize have network byte order
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bool prepare_tcp_segment4(
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const struct sockaddr_in *src, const struct sockaddr_in *dst,
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uint8_t tcp_flags,
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uint32_t nseq, uint32_t nack_seq,
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uint16_t nwsize,
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uint8_t scale_factor,
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uint32_t *timestamps,
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uint8_t ttl,
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uint8_t fooling,
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const void *data, uint16_t len,
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uint8_t *buf, size_t *buflen);
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bool prepare_tcp_segment6(
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const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
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uint8_t tcp_flags,
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uint32_t nseq, uint32_t nack_seq,
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uint16_t nwsize,
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uint8_t scale_factor,
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uint32_t *timestamps,
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uint8_t ttl,
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uint8_t fooling,
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const void *data, uint16_t len,
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uint8_t *buf, size_t *buflen);
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bool prepare_tcp_segment(
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const struct sockaddr *src, const struct sockaddr *dst,
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uint8_t tcp_flags,
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uint32_t nseq, uint32_t nack_seq,
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uint16_t nwsize,
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uint8_t scale_factor,
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uint32_t *timestamps,
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uint8_t ttl,
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uint8_t fooling,
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const void *data, uint16_t len,
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uint8_t *buf, size_t *buflen);
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void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr, struct sockaddr_storage *src, struct sockaddr_storage *dst);
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uint8_t *tcp_find_option(struct tcphdr *tcp, uint8_t kind);
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uint32_t *tcp_find_timestamps(struct tcphdr *tcp);
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uint8_t tcp_find_scale_factor(const struct tcphdr *tcp);
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// auto creates internal socket and uses it for subsequent calls
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bool rawsend(const struct sockaddr* dst,uint32_t fwmark,const void *data,size_t len);
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// should pre-do it if dropping privileges. otherwise its not necessary
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bool rawsend_preinit(uint32_t fwmark);
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// cleans up socket autocreated by rawsend
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void rawsend_cleanup();
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void print_ip(const struct ip *ip);
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void print_ip6hdr(const struct ip6_hdr *ip6hdr, uint8_t proto);
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void print_tcphdr(const struct tcphdr *tcphdr);
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bool proto_check_ipv4(const uint8_t *data, size_t len);
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void proto_skip_ipv4(uint8_t **data, size_t *len);
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bool proto_check_tcp(const uint8_t *data, size_t len);
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void proto_skip_tcp(uint8_t **data, size_t *len);
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bool proto_check_ipv6(const uint8_t *data, size_t len);
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void proto_skip_ipv6(uint8_t **data, size_t *len, uint8_t *proto_type);
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bool tcp_synack_segment(const struct tcphdr *tcphdr);
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bool tcp_syn_segment(const struct tcphdr *tcphdr);
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bool tcp_ack_segment(const struct tcphdr *tcphdr);
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// scale_factor=SCALE_NONE - do not change
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void tcp_rewrite_wscale(struct tcphdr *tcp, uint8_t scale_factor);
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void tcp_rewrite_winsize(struct tcphdr *tcp, uint16_t winsize, uint8_t scale_factor);
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