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// Example: here's a quickie implementation of the messages in the
// socks5 protocol.
struct socks5_client_version {
u8 version IN [5];
u8 n_methods;
u8 methods[n_methods];
}
struct socks5_server_method {
u8 version IN [5];
u8 method;
}
const CMD_CONNECT = 1;
const CMD_BIND = 2;
const CMD_UDP_ASSOCIATE = 3;
// This is a tor extension
const CMD_RESOLVE = 0xF0;
const CMD_RESOLVE_PTR = 0xF1;
const ATYPE_IPV4 = 1;
const ATYPE_IPV6 = 4;
const ATYPE_DOMAINNAME = 3;
struct domainname {
u8 len;
char name[len];
}
struct socks5_client_request {
u8 version IN [5];
u8 command IN [CMD_CONNECT, CMD_BIND, CMD_UDP_ASSOCIATE, CMD_RESOLVE, CMD_RESOLVE_PTR];
u8 reserved IN [0];
u8 atype;
union dest_addr[atype] {
ATYPE_IPV4: u32 ipv4;
ATYPE_IPV6: u8 ipv6[16];
ATYPE_DOMAINNAME: struct domainname domainname;
default: fail;
};
u16 dest_port;
}
struct socks5_server_reply {
u8 version IN [5];
u8 reply;
u8 reserved IN [0];
u8 atype;
union bind_addr[atype] {
ATYPE_IPV4: u32 ipv4;
ATYPE_IPV6: u8 ipv6[16];
ATYPE_DOMAINNAME: struct domainname domainname;
default: fail;
};
u16 bind_port;
}
struct socks5_client_userpass_auth {
u8 version IN [1];
u8 username_len;
char username[username_len];
u8 passwd_len;
char passwd[passwd_len];
}
struct socks5_server_userpass_auth {
u8 version IN [1];
u8 status;
}
// Oh why not. Here's socks4 and socks4a.
struct socks4_client_request {
u8 version IN [4];
u8 command IN [CMD_CONNECT,CMD_BIND,CMD_RESOLVE,CMD_RESOLVE_PTR];
u16 port;
u32 addr;
nulterm username;
union socks4a_addr[addr] {
1..255:
nulterm hostname;
default:
;
};
}
struct socks4_server_reply {
u8 version IN [0,4];
u8 status;
u16 port;
u32 addr;
}
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