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socks.h
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socks.h
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/* ------------------------------------------------------------------------------------------------------------------ */
/* TS-Warp - Transparent proxy server and traffic wrapper */
/* ------------------------------------------------------------------------------------------------------------------ */
/*
* Copyright (c) 2021-2024, Mikhail Zakharov <zmey20000@yahoo.com>
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* -- Socks protocol definitions ------------------------------------------------------------------------------------ */
#define PROXY_PROTO_SOCKS_V4 '4'
#define PROXY_PROTO_SOCKS_V5 '5'
/* -- Socks4 -------------------------------------------------------------------------------------------------------- */
#define SOCKS4_CMD_TCPCONNECT 0x01
#define SOCKS4_CMD_TCPBIND 0x02
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cmd; /* Command
0x01: TCP Connect;
0x02: TCP port Binding */
uint16_t dstport; /* Dest port number in a network byte order */
uint32_t dstaddr; /* IPv4 Address 4 bytes in network byte order */
unsigned char id[256]; /* Null-terminated user ID string */
} s4_request;
typedef struct {
uint8_t nul; /* NUL-byte */
uint8_t status; /* Returned status
0x5A: Request granted
0x5B: Request rejected or failed
0x5C: Request failed: client is not running identd (or not reachable from server)
0x5D: Request failed because client's identd could not confirm the user ID */
uint16_t dstport; /* Dest port number in a network byte order */
uint32_t dstaddr; /* IPv4 Address 4 bytes in network byte order */
} s4_reply;
/* Socks4 server replies. Only 0x5a and 0x5b are interesting */
#define SOCKS4_REPLY_OK 0x5a /* Request granted */
#define SOCKS4_REPLY_KO 0x5b /* Request rejected or failed */
#define SOCKS4_REPLY_KO_IDENT1 0x5c /* Request failed because client is not running identd */
#define SOCKS4_REPLY_KO_IDENT2 0x5d /* Request failed because client's identd couldn't confirm user */
/* -- Socks5 -------------------------------------------------------------------------------------------------------- */
#define AUTH_MAX_METHODS 255
#define AUTH_METHOD_NOAUTH 0x00
#define AUTH_METHOD_GSSAPI 0x01
#define AUTH_METHOD_UNAME 0x02
/* 0x03–0x7F: methods assigned by IANA */
#define AUTH_METHOD_CHAP 0x03 /* Challenge-Handshake Auth Proto */
/* 0x04 Unassigned */
#define AUTH_METHOD_CRAM 0x05 /* Challenge-Response Auth Method */
#define AUTH_METHOD_SSL 0x06 /* Secure Sockets Layer */
#define AUTH_METHOD_NDS 0x07 /* NDS Authentication (Novell?) */
#define AUTH_METHOD_MAF 0x08 /* Multi-Authentication Framework */
#define AUTH_METHOD_JPB 0x09 /* JSON Parameter Block */
/* 0x0A–0x7F Unassigned */
/* 0x80–0xFE Reserved for private use */
#define AUTH_METHOD_NOACCEPT 0xFF /* No methods accepted by server */
typedef struct {
uint8_t ver; /* Socks version */
uint8_t nauth; /* Number of auth methods */
uint8_t auth[AUTH_MAX_METHODS]; /* Authentication methods */
} s5_request_hello;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cauth; /* Chosen auth method */
} s5_reply_hello;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t idlen; /* Username length */
uint8_t *id; /* ID 1-255 chars */
uint8_t pwlen; /* Password length */
uint8_t *pw; /* Password 1-255 */
} s5_request_auth;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t status; /* 0x00: OK, else KO */
} s5_reply_auth;
/* Useful Socks5 request field definitions of s5_request* structures */
/* Command: cmd */
#define SOCKS5_CMD_TCPCONNECT 0x01
#define SOCKS5_CMD_TCPBIND 0x02
#define SOCKS5_CMD_UDPASSOCIATE 0x03
/* Address type: atype */
#define SOCKS5_ATYPE_NONE 0x00 /* NB! Non standard, for ts-warp only */
#define SOCKS5_ATYPE_IPV4 0x01
#define SOCKS5_ATYPE_NAME 0x03
#define SOCKS5_ATYPE_IPV6 0x04
/* Address type: atype max length */
#define SOCKS5_ATYPE_IPV4_LEN 4
#define SOCKS5_ATYPE_NAME_LEN 256 /* 1 + HOST_NAME_MAX */
#define SOCKS5_ATYPE_IPV6_LEN 16
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cmd; /* Command
0x01: TCP Connect;
0x02: TCP port Binding, e.g. FTP;
0x03: associate a UDP port */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Destination address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t dsthost[1 + HOST_NAME_MAX + 2]; /* Destination address + port in a net byte order:
IPv4 address: 4 bytes
Domain name: 1 byte Length + 1-255 bytes Name
IPv6 address: 16 bytes
Dest port: 2 bytes */
} s5_request;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cmd; /* Command
0x01: TCP Connect;
0x02: TCP port Binding, e.g. FTP;
0x03: associate a UDP port */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Destination address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t dstaddr[4]; /* Destination address
IPv4 address: 4 bytes
Domain name: 1 byte Length + 1-255 bytes Name
IPv6 address: 16 bytes */
uint16_t dstport; /* Dest port number in a network byte order */
} s5_request_ipv4;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cmd; /* Command
0x01: TCP Connect;
0x02: TCP port Binding, e.g. FTP;
0x03: associate a UDP port */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Destination address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t dstaddr[16]; /* Destination address
IPv4 address: 4 bytes
Domain name: 1 byte Length + 1-255 bytes Name
IPv6 address: 16 bytes */
uint16_t dstport; /* Dest port number in a network byte order */
} s5_request_ipv6;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t cmd; /* Command
0x01: TCP Connect;
0x02: TCP port Binding, e.g. FTP;
0x03: associate a UDP port */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Destination address type */
} s5_request_short;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t status; /* Returned status
0x00: Request granted
0x01: General failure
0x02: Connection not allowed by ruleset
0x03: Network unreachable
0x04: Host unreachable
0x05: Connection refused by destination host
0x06: TTL expired
0x07: Command not supported / protocol error
0x08: Address type not supported */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Server bound address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t bndaddrport[1 + HOST_NAME_MAX + 2]; /* A buffer to accomodate all types of addresses and a port */
} s5_reply;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t status; /* Returned status
0x00: Request granted
0x01: General failure
0x02: Connection not allowed by ruleset
0x03: Network unreachable
0x04: Host unreachable
0x05: Connection refused by destination host
0x06: TTL expired
0x07: Command not supported / protocol error
0x08: Address type not supported */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Server bound address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t dstaddr[4]; /* Destination address
IPv4 address: 4 bytes
Domain name: 1 byte Length + 1-255 bytes Name
IPv6 address: 16 bytes */
uint16_t dstport; /* Dest port number in a network byte order */
} s5_reply_ipv4;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t status; /* Returned status
0x00: Request granted
0x01: General failure
0x02: Connection not allowed by ruleset
0x03: Network unreachable
0x04: Host unreachable
0x05: Connection refused by destination host
0x06: TTL expired
0x07: Command not supported / protocol error
0x08: Address type not supported */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Server bound address type
0x01: IPv4 address
0x03: Domain name
0x04: IPv6 address */
uint8_t dstaddr[16]; /* Destination address
IPv4 address: 4 bytes
Domain name: 1 byte Length + 1-255 bytes Name
IPv6 address: 16 bytes */
uint16_t dstport; /* Dest port number in a network byte order */
} s5_reply_ipv6;
typedef struct {
uint8_t ver; /* Socks version */
uint8_t status; /* Returned status
0x00: Request granted
0x01: General failure
0x02: Connection not allowed by ruleset
0x03: Network unreachable
0x04: Host unreachable
0x05: Connection refused by destination host
0x06: TTL expired
0x07: Command not supported / protocol error
0x08: Address type not supported */
uint8_t rsv; /* 0x00: Reserved */
uint8_t atype; /* Server bound address type 0x01: IPv4 address */
} s5_reply_short;
/* Socks5 reply statuses */
#define SOCKS5_REPLY_OK 0x00 /* Request granted */
#define SOCKS5_REPLY_KO 0x01 /* General failure */
#define SOCKS5_REPLY_DENIED 0x02 /* Connection not allowed by ruleset */
#define SOCKS5_REPLY_NET_UNREACH 0x03 /* Network unreacheable */
#define SOCKS5_REPLY_HOST_UNREACH 0x04 /* Host unreacheable */
#define SOCKS5_REPLY_CONN_REFUSED 0x05 /* Connection refused by target host */
#define SOCKS5_REPLY_TTL_EXPIRED 0x06 /* TTL expired */
#define SOCKS5_REPLY_UNSUPPORTED 0x07 /* Command unsupported / protocol error */
#define SOCKS5_REPLY_ATYPE_ERROR 0x08 /* Address type is not supported */
/* -- Function prototypes ------------------------------------------------------------------------------------------- */
int socks4_client_request(chs cs, uint8_t cmd, struct sockaddr_in *daddr, char *user);
int socks5_client_hello(chs cs, unsigned int auth_method, ...);
int socks5_client_auth(chs cs, char *user, char *password);
int socks5_client_request(chs cs, uint8_t cmd, struct sockaddr_storage *daddr, char *dname);
int socks5_server_hello(int socket);
uint8_t socks5_server_request(int socket, struct uvaddr *daddr);
uint8_t socks5_server_reply(int socket, struct sockaddr_storage *iaddr, uint8_t atype);