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libuv/samples/socks5-proxy/s5.c  view on Meta::CPAN

        if (cx->arg0 < cx->arg1) {
          switch (c) {
            case 0:
              cx->methods |= S5_AUTH_NONE;
              break;
            case 1:
              cx->methods |= S5_AUTH_GSSAPI;
              break;
            case 2:
              cx->methods |= S5_AUTH_PASSWD;
              break;
            /* Ignore everything we don't understand. */
          }
          cx->arg0 += 1;
        }
        if (cx->arg0 == cx->arg1) {
          err = s5_auth_select;
          goto out;
        }
        break;

      case s5_auth_pw_version:
        if (c != 1) {
          err = s5_bad_version;
          goto out;
        }
        cx->state = s5_auth_pw_userlen;
        break;

      case s5_auth_pw_userlen:
        cx->arg0 = 0;
        cx->userlen = c;
        cx->state = s5_auth_pw_username;
        break;

      case s5_auth_pw_username:
        if (cx->arg0 < cx->userlen) {
          cx->username[cx->arg0] = c;
          cx->arg0 += 1;
        }
        if (cx->arg0 == cx->userlen) {
          cx->username[cx->userlen] = '\0';
          cx->state = s5_auth_pw_passlen;
        }
        break;

      case s5_auth_pw_passlen:
        cx->arg0 = 0;
        cx->passlen = c;
        cx->state = s5_auth_pw_password;
        break;

      case s5_auth_pw_password:
        if (cx->arg0 < cx->passlen) {
          cx->password[cx->arg0] = c;
          cx->arg0 += 1;
        }
        if (cx->arg0 == cx->passlen) {
          cx->password[cx->passlen] = '\0';
          cx->state = s5_req_version;
          err = s5_auth_verify;
          goto out;
        }
        break;

      case s5_req_version:
        if (c != 5) {
          err = s5_bad_version;
          goto out;
        }
        cx->state = s5_req_cmd;
        break;

      case s5_req_cmd:
        switch (c) {
          case 1:  /* TCP connect */
            cx->cmd = s5_cmd_tcp_connect;
            break;
          case 3:  /* UDP associate */
            cx->cmd = s5_cmd_udp_assoc;
            break;
          default:
            err = s5_bad_cmd;
            goto out;
        }
        cx->state = s5_req_reserved;
        break;

      case s5_req_reserved:
        cx->state = s5_req_atyp;
        break;

      case s5_req_atyp:
        cx->arg0 = 0;
        switch (c) {
          case 1:  /* IPv4, four octets. */
            cx->state = s5_req_daddr;
            cx->atyp = s5_atyp_ipv4;
            cx->arg1 = 4;
            break;
          case 3:  /* Hostname.  First byte is length. */
            cx->state = s5_req_atyp_host;
            cx->atyp = s5_atyp_host;
            cx->arg1 = 0;
            break;
          case 4:  /* IPv6, sixteen octets. */
            cx->state = s5_req_daddr;
            cx->atyp = s5_atyp_ipv6;
            cx->arg1 = 16;
            break;
          default:
            err = s5_bad_atyp;
            goto out;
        }
        break;

      case s5_req_atyp_host:
        cx->arg1 = c;
        cx->state = s5_req_daddr;
        break;