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https://github.com/bol-van/zapret.git
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227 lines
7.3 KiB
C
227 lines
7.3 KiB
C
#pragma once
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#define __FAVOR_BSD
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <netinet/in.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/udp.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include "checksum.h"
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#ifdef __CYGWIN__
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#include "windivert/windivert.h"
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#endif
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#include "packet_queue.h"
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#include "pools.h"
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#ifndef IPPROTO_DIVERT
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#define IPPROTO_DIVERT 258
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#endif
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#ifndef AF_DIVERT
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#define AF_DIVERT 44 /* divert(4) */
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#endif
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#ifndef PF_DIVERT
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#define PF_DIVERT AF_DIVERT
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#endif
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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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uint32_t net16_add(uint16_t netorder_value, uint16_t cpuorder_increment);
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#define FOOL_NONE 0x00
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#define FOOL_MD5SIG 0x01
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#define FOOL_BADSUM 0x02
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#define FOOL_TS 0x04
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#define FOOL_BADSEQ 0x08
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#define FOOL_HOPBYHOP 0x10
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#define FOOL_HOPBYHOP2 0x20
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#define FOOL_DESTOPT 0x40
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#define FOOL_IPFRAG1 0x80
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#define FOOL_DATANOACK 0x100
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#define SCALE_NONE ((uint8_t)-1)
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#define VERDICT_PASS 0
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#define VERDICT_MODIFY 1
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#define VERDICT_DROP 2
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#define VERDICT_MASK 3
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#define VERDICT_NOCSUM 4
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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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uint32_t fooling,
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uint32_t badseq_increment,
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uint32_t badseq_ack_increment,
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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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uint32_t fooling,
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uint32_t badseq_increment,
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uint32_t badseq_ack_increment,
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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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uint32_t fooling,
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uint32_t badseq_increment,
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uint32_t badseq_ack_increment,
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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_udp_segment4(
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const struct sockaddr_in *src, const struct sockaddr_in *dst,
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uint8_t ttl,
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uint32_t fooling,
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const uint8_t *padding, size_t padding_size,
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int padlen,
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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_udp_segment6(
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const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
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uint8_t ttl,
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uint32_t fooling,
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const uint8_t *padding, size_t padding_size,
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int padlen,
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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_udp_segment(
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const struct sockaddr *src, const struct sockaddr *dst,
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uint8_t ttl,
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uint32_t fooling,
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const uint8_t *padding, size_t padding_size,
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int padlen,
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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 ip6_insert_simple_hdr(uint8_t type, uint8_t *data_pkt, size_t len_pkt, uint8_t *buf, size_t *buflen);
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// ipv4: ident==-1 - copy ip_id from original ipv4 packet
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bool ip_frag4(
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const uint8_t *pkt, size_t pkt_size,
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size_t frag_pos, uint32_t ident,
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uint8_t *pkt1, size_t *pkt1_size,
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uint8_t *pkt2, size_t *pkt2_size);
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bool ip_frag6(
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const uint8_t *pkt, size_t pkt_size,
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size_t frag_pos, uint32_t ident,
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uint8_t *pkt1, size_t *pkt1_size,
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uint8_t *pkt2, size_t *pkt2_size);
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bool ip_frag(
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const uint8_t *pkt, size_t pkt_size,
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size_t frag_pos, uint32_t ident,
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uint8_t *pkt1, size_t *pkt1_size,
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uint8_t *pkt2, size_t *pkt2_size);
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void rewrite_ttl(struct ip *ip, struct ip6_hdr *ip6, uint8_t ttl);
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void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport);
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void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr,const struct udphdr *udphdr, 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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bool tcp_has_fastopen(const struct tcphdr *tcp);
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#ifdef __CYGWIN__
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extern uint32_t w_win32_error;
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bool win_dark_init(const struct str_list_head *ssid_filter, const struct str_list_head *nlm_filter);
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bool win_dark_deinit(void);
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bool logical_net_filter_match(void);
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bool nlm_list(bool bAll);
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bool windivert_init(const char *filter);
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bool windivert_recv(uint8_t *packet, size_t *len, WINDIVERT_ADDRESS *wa);
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bool windivert_send(const uint8_t *packet, size_t len, const WINDIVERT_ADDRESS *wa);
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#else
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// should pre-do it if dropping privileges. otherwise its not necessary
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bool rawsend_preinit(bool bind_fix4, bool bind_fix6);
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#endif
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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 char *ifout,const void *data,size_t len);
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bool rawsend_rp(const struct rawpacket *rp);
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// return trues if all packets were send successfully
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bool rawsend_queue(struct rawpacket_tailhead *q);
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// cleans up socket autocreated by rawsend
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void rawsend_cleanup(void);
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#ifdef BSD
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int socket_divert(sa_family_t family);
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#endif
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const char *proto_name(uint8_t proto);
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uint16_t family_from_proto(uint8_t l3proto);
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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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void print_udphdr(const struct udphdr *udphdr);
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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_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, uint8_t **last_header_type);
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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_udp(const uint8_t *data, size_t len);
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void proto_skip_udp(uint8_t **data, size_t *len);
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void proto_dissect_l3l4(
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uint8_t *data, size_t len,
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struct ip **ip, struct ip6_hdr **ip6,
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uint8_t *proto,
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struct tcphdr **tcp,
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struct udphdr **udp,
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size_t *transport_len,
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uint8_t **data_payload, size_t *len_payload);
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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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typedef struct
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{
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uint8_t delta, min, max;
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} autottl;
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#define AUTOTTL_DEFAULT_DELTA 1
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#define AUTOTTL_DEFAULT_MIN 3
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#define AUTOTTL_DEFAULT_MAX 20
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#define AUTOTTL_ENABLED(a) (!!(a).delta)
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#define AUTOTTL_SET_DEFAULT(a) {(a).delta=AUTOTTL_DEFAULT_DELTA; (a).min=AUTOTTL_DEFAULT_MIN; (a).max=AUTOTTL_DEFAULT_MAX;}
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uint8_t autottl_guess(uint8_t ttl, const autottl *attl);
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void do_nat(bool bOutbound, struct ip *ip, struct ip6_hdr *ip6, struct tcphdr *tcphdr, struct udphdr *udphdr, const struct sockaddr_in *target4, const struct sockaddr_in6 *target6);
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void verdict_tcp_csum_fix(uint8_t verdict, struct tcphdr *tcphdr, size_t transport_len, struct ip *ip, struct ip6_hdr *ip6hdr);
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void verdict_udp_csum_fix(uint8_t verdict, struct udphdr *udphdr, size_t transport_len, struct ip *ip, struct ip6_hdr *ip6hdr);
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