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https://github.com/Waujito/youtubeUnblock.git
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Add crypto files
This commit is contained in:
Vadim Vetrov
210
src/utils.h
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210
src/utils.h
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#ifndef UTILS_H
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#define UTILS_H
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#include "types.h"
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#include "config.h"
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#define IP4VERSION 4
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#define IP6VERSION 6
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/**
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* Splits the packet to two IP fragments on position payload_offset.
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* payload_offset indicates the position relatively to start of IP payload
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* (start of transport header)
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*/
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int ip4_frag(const uint8_t *pkt, uint32_t pktlen,
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uint32_t payload_offset,
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uint8_t *frag1, uint32_t *f1len,
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uint8_t *frag2, uint32_t *f2len);
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/**
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* Splits the packet to two TCP segments on position payload_offset
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* payload_offset indicates the position relatively to start of TCP payload.
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*/
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// int tcp4_frag(const uint8_t *pkt, uint32_t pktlen,
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// uint32_t payload_offset,
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// uint8_t *seg1, uint32_t *s1len,
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// uint8_t *seg2, uint32_t *s2len);
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int tcp_frag(const uint8_t *pkt, uint32_t pktlen,
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uint32_t payload_offset,
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uint8_t *seg1, uint32_t *s1len,
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uint8_t *seg2, uint32_t *s2len);
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/**
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* Splits the raw packet payload to ip header and ip payload.
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*/
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int ip4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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uint8_t **payload, uint32_t *plen);
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static inline int netproto_version(const uint8_t *pkt, uint32_t buflen) {
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if (pkt == NULL || buflen == 0)
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return -1;
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return (*pkt) >> 4;
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}
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/**
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* Splits the raw packet payload to ip header, tcp header and tcp payload.
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*/
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int tcp4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header and ip payload.
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*/
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int ip6_payload_split(uint8_t *pkt, uint32_t buflen,
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struct ip6_hdr **iph, uint32_t *iph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header, tcp header and tcp payload.
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*/
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int tcp6_payload_split(uint8_t *pkt, uint32_t buflen,
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struct ip6_hdr **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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int tcp_payload_split(uint8_t *pkt, uint32_t buflen,
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void **iph, uint32_t *iph_len,
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struct tcphdr **tcph, uint32_t *tcph_len,
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uint8_t **payload, uint32_t *plen);
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/**
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* Splits the raw packet payload to ip header, udp header and udp payload.
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*/
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int udp4_payload_split(uint8_t *pkt, uint32_t buflen,
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struct iphdr **iph, uint32_t *iph_len,
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struct udphdr **udph,
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uint8_t **payload, uint32_t *plen);
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int udp6_payload_split(uint8_t *pkt, uint32_t buflen,
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struct ip6_hdr **iph, uint32_t *iph_len,
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struct udphdr **udph,
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uint8_t **payload, uint32_t *plen);
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int udp_payload_split(uint8_t *pkt, uint32_t buflen,
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void **iph, uint32_t *iph_len,
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struct udphdr **udph,
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uint8_t **payload, uint32_t *plen);
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void tcp4_set_checksum(struct tcphdr *tcph, struct iphdr *iph);
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void ip4_set_checksum(struct iphdr *iph);
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void ip6_set_checksum(struct ip6_hdr *iph);
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void tcp6_set_checksum(struct tcphdr *tcph, struct ip6_hdr *iph);
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void udp4_set_checksum(struct udphdr *udph, struct iphdr *iph);
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void udp6_set_checksum(struct udphdr *udph, struct ip6_hdr *iph);
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int set_ip_checksum(void *iph, uint32_t iphb_len);
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int set_tcp_checksum(struct tcphdr *tcph, void *iph, uint32_t iphb_len);
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int set_udp_checksum(struct udphdr *udph, void *iph, uint32_t iphb_len);
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void z_function(const char *str, int *zbuf, size_t len);
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/**
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* Shifts data left delta bytes. Fills delta buffer with zeroes.
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*/
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void shift_data(uint8_t *data, uint32_t dlen, uint32_t delta);
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struct failing_strategy {
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unsigned int strategy;
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uint8_t faking_ttl;
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uint32_t randseq_offset;
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};
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struct fake_type {
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#define FAKE_PAYLOAD_RANDOM 0
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#define FAKE_PAYLOAD_DATA 1
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// In default mode all other options will be skipped.
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#define FAKE_PAYLOAD_DEFAULT 2
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int type;
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// Length of the final fake message.
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// Pass 0 in RANDOM mode to make it random
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uint16_t fake_len;
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// Payload of the fake message of fake_len length.
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// Will be omitted in RANDOM mode.
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const char *fake_data;
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unsigned int sequence_len;
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// If non-0 the packet send will be delayed for n milliseconds
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unsigned int seg2delay;
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// faking strategy of the fake packet.
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// Does not support bitmask, pass standalone strategy.
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// Pass 0 if you don't want any faking procedures.
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struct failing_strategy strategy;
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};
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struct udp_failing_strategy {
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unsigned int strategy;
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uint8_t faking_ttl;
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};
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struct udp_fake_type {
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uint16_t fake_len;
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// faking strategy of the fake packet.
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// Does not support bitmask, pass standalone strategy.
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// Pass 0 if you don't want any faking procedures.
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struct udp_failing_strategy strategy;
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};
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/**
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* Invalidates the raw packet. The function aims to invalid the packet
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* in such way as it will be accepted by DPI, but dropped by target server
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*
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* Does not support bitmask, pass standalone strategy.
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*/
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int fail_packet(struct failing_strategy strategy, uint8_t *payload, uint32_t *plen, uint32_t avail_buflen);
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/**
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* Shifts the payload right and pushes zeroes before it. Useful for TCP TLS faking.
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*/
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int seqovl_packet(uint8_t *payload, uint32_t *plen, uint32_t seq_delta);
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static inline struct failing_strategy args_default_failing_strategy(const struct section_config_t *section) {
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struct failing_strategy fl_strat = {
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.strategy = (unsigned int)section->faking_strategy,
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.faking_ttl = section->faking_ttl,
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.randseq_offset = (uint32_t)section->fakeseq_offset
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};
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return fl_strat;
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}
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static inline struct fake_type args_default_fake_type(const struct section_config_t *section) {
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struct fake_type f_type = {
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.sequence_len = section->fake_sni_seq_len,
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.strategy = args_default_failing_strategy(section),
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};
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switch (section->fake_sni_type) {
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case FAKE_PAYLOAD_RANDOM:
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f_type.type = FAKE_PAYLOAD_RANDOM;
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break;
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case FAKE_PAYLOAD_CUSTOM:
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f_type.type = FAKE_PAYLOAD_CUSTOM;
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f_type.fake_data = section->fake_custom_pkt;
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f_type.fake_len = section->fake_custom_pkt_sz;
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break;
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default:
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f_type.type = FAKE_PAYLOAD_CUSTOM;
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f_type.fake_data = section->fake_sni_pkt;
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f_type.fake_len = section->fake_sni_pkt_sz;
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}
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return f_type;
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}
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#endif /* UTILS_H */
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