mirror of
https://github.com/bol-van/zapret.git
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94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
#pragma once
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#include <stdint.h>
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#include <arpa/inet.h>
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#pragma pack(push,1)
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#define S4_CMD_CONNECT 1
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#define S4_CMD_BIND 2
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typedef struct
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{
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uint8_t ver,cmd;
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uint16_t port;
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uint32_t ip;
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} s4_req;
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#define S4_REQ_HEADER_VALID(r,l) (l>=sizeof(s4_req) && r->ver==4)
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#define S4_REQ_CONNECT_VALID(r,l) (S4_REQ_HEADER_VALID(r,l) && r->cmd==S4_CMD_CONNECT)
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#define S4_REP_OK 90
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#define S4_REP_FAILED 91
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typedef struct
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{
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uint8_t zero,rep;
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uint16_t port;
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uint32_t ip;
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} s4_rep;
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#define S5_AUTH_NONE 0
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#define S5_AUTH_GSSAPI 1
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#define S5_AUTH_USERPASS 2
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#define S5_AUTH_UNACCEPTABLE 0xFF
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typedef struct
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{
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uint8_t ver,nmethods,methods[255];
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} s5_handshake;
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#define S5_REQ_HANDHSHAKE_VALID(r,l) (l>=3 && r->ver==5 && r->nmethods && l>=(2+r->nmethods))
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typedef struct
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{
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uint8_t ver,method;
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} s5_handshake_ack;
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#define S5_CMD_CONNECT 1
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#define S5_CMD_BIND 2
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#define S5_CMD_UDP_ASSOC 3
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#define S5_ATYP_IP4 1
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#define S5_ATYP_DOM 3
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#define S5_ATYP_IP6 4
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typedef struct
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{
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uint8_t ver,cmd,rsv,atyp;
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union {
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struct {
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struct in_addr addr;
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uint16_t port;
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} d4;
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struct {
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struct in6_addr addr;
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uint16_t port;
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} d6;
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struct {
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uint8_t len;
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char domport[255+2]; // max hostname + binary port
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} dd;
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};
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} s5_req;
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#define S5_REQ_HEADER_VALID(r,l) (l>=4 && r->ver==5)
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#define S5_IP46_VALID(r,l) ((r->atyp==S5_ATYP_IP4 && l>=(4+sizeof(r->d4))) || (r->atyp==S5_ATYP_IP6 && l>=(4+sizeof(r->d6))))
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#define S5_REQ_CONNECT_VALID(r,l) (S5_REQ_HEADER_VALID(r,l) && r->cmd==S5_CMD_CONNECT && (S5_IP46_VALID(r,l) || (r->atyp==S5_ATYP_DOM && l>=5 && l>=(5+r->dd.len))))
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#define S5_PORT_FROM_DD(r,l) (l>=(4+r->dd.len+2) ? ntohs(*(uint16_t*)(r->dd.domport+r->dd.len)) : 0)
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#define S5_REP_OK 0
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#define S5_REP_GENERAL_FAILURE 1
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#define S5_REP_NOT_ALLOWED_BY_RULESET 2
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#define S5_REP_NETWORK_UNREACHABLE 3
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#define S5_REP_HOST_UNREACHABLE 4
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#define S5_REP_CONN_REFUSED 5
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#define S5_REP_TTL_EXPIRED 6
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#define S5_REP_COMMAND_NOT_SUPPORTED 7
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#define S5_REP_ADDR_TYPE_NOT_SUPPORTED 8
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typedef struct
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{
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uint8_t ver,rep,rsv,atyp;
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union {
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struct {
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struct in_addr addr;
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uint16_t port;
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} d4;
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};
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} s5_rep;
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#pragma pack(pop)
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