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The Tor anonymity network
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socks5.trunnel (1851B)

      1 // Example: here's a quickie implementation of the messages in the
      2 // socks5 protocol.
      3 
      4 struct socks5_client_version {
      5    u8 version IN [5];
      6    u8 n_methods;
      7    u8 methods[n_methods];
      8 }
      9 
     10 struct socks5_server_method {
     11    u8 version IN [5];
     12    u8 method;
     13 }
     14 
     15 const CMD_CONNECT = 1;
     16 const CMD_BIND = 2;
     17 const CMD_UDP_ASSOCIATE = 3;
     18 // This is a tor extension
     19 const CMD_RESOLVE = 0xF0;
     20 const CMD_RESOLVE_PTR = 0xF1;
     21 
     22 const ATYPE_IPV4 = 1;
     23 const ATYPE_IPV6 = 4;
     24 const ATYPE_DOMAINNAME = 3;
     25 
     26 struct domainname {
     27    u8 len;
     28    char name[len];
     29 }
     30 
     31 struct socks5_client_request {
     32    u8 version IN [5];
     33    u8 command IN [CMD_CONNECT, CMD_BIND, CMD_UDP_ASSOCIATE, CMD_RESOLVE, CMD_RESOLVE_PTR];
     34    u8 reserved IN [0];
     35    u8 atype;
     36    union dest_addr[atype] {
     37      ATYPE_IPV4: u32 ipv4;
     38      ATYPE_IPV6: u8 ipv6[16];
     39      ATYPE_DOMAINNAME: struct domainname domainname;
     40      default: fail;
     41    };
     42    u16 dest_port;
     43 }
     44 
     45 struct socks5_server_reply {
     46    u8 version IN [5];
     47    u8 reply;
     48    u8 reserved IN [0];
     49    u8 atype;
     50    union bind_addr[atype] {
     51      ATYPE_IPV4: u32 ipv4;
     52      ATYPE_IPV6: u8 ipv6[16];
     53      ATYPE_DOMAINNAME: struct domainname domainname;
     54      default: fail;
     55    };
     56    u16 bind_port;
     57 }
     58 
     59 struct socks5_client_userpass_auth {
     60    u8 version IN [1];
     61    u8 username_len;
     62    char username[username_len];
     63    u8 passwd_len;
     64    char passwd[passwd_len];
     65 }
     66 
     67 struct socks5_server_userpass_auth {
     68    u8 version IN [1];
     69    u8 status;
     70 }
     71 
     72 // Oh why not.  Here's socks4 and socks4a.
     73 
     74 struct socks4_client_request {
     75    u8 version IN [4];
     76    u8 command IN [CMD_CONNECT,CMD_BIND,CMD_RESOLVE,CMD_RESOLVE_PTR];
     77    u16 port;
     78    u32 addr;
     79    nulterm username;
     80    union socks4a_addr[addr] {
     81       1..255:
     82                nulterm hostname;
     83       default:
     84                ;
     85    };
     86 }
     87 
     88 struct socks4_server_reply {
     89    u8 version IN [0,4];
     90    u8 status;
     91    u16 port;
     92    u32 addr;
     93 }
     94