void *data;
int len;
- p->lock_close =
- p->lock_write =
- p->lock_write_oob =
- p->lock_receive =
- p->lock_flush =
- p->lock_closing =
- p->lock_sent =
- p->lock_accepting =
- p->lock_freeze = 1;
-
p->state = PROXY_STATE_ACTIVE;
/* let's try to keep extra receive events from coming through */
sk_set_frozen(p->sub_socket, 1);
+ /* send buffered OOB writes */
while (bufchain_size(&p->pending_oob_output_data) > 0) {
bufchain_prefix(&p->pending_oob_output_data, &data, &len);
sk_write_oob(p->sub_socket, data, len);
}
bufchain_clear(&p->pending_oob_output_data);
+ /* send buffered normal writes */
while (bufchain_size(&p->pending_output_data) > 0) {
bufchain_prefix(&p->pending_output_data, &data, &len);
sk_write(p->sub_socket, data, len);
}
bufchain_clear(&p->pending_output_data);
- p->lock_write_oob = 0;
- p->lock_write = 0;
-
+ /* if we were asked to flush the output during
+ * the proxy negotiation process, do so now.
+ */
if (p->pending_flush) sk_flush(p->sub_socket);
- p->lock_flush = 0;
+ /* forward buffered recv data to the backend */
while (bufchain_size(&p->pending_input_data) > 0) {
bufchain_prefix(&p->pending_input_data, &data, &len);
plug_receive(p->plug, 0, data, len);
bufchain_consume(&p->pending_input_data, len);
}
bufchain_clear(&p->pending_input_data);
- p->lock_receive = 0;
/* now set the underlying socket to whatever freeze state they wanted */
sk_set_frozen(p->sub_socket, p->freeze);
- p->lock_freeze = 0;
-
- p->lock_sent = 0;
- p->lock_accepting = 0;
- p->lock_closing = 0;
- p->lock_close = 0;
}
/* basic proxy socket functions */
{
Proxy_Socket ps = (Proxy_Socket) s;
- while (ps->lock_close) ;
sk_close(ps->sub_socket);
sfree(ps);
}
{
Proxy_Socket ps = (Proxy_Socket) s;
- while (ps->lock_write) ;
if (ps->state != PROXY_STATE_ACTIVE) {
bufchain_add(&ps->pending_output_data, data, len);
return bufchain_size(&ps->pending_output_data);
{
Proxy_Socket ps = (Proxy_Socket) s;
- while (ps->lock_write_oob) ;
if (ps->state != PROXY_STATE_ACTIVE) {
bufchain_clear(&ps->pending_output_data);
bufchain_clear(&ps->pending_oob_output_data);
{
Proxy_Socket ps = (Proxy_Socket) s;
- while (ps->lock_flush) ;
if (ps->state != PROXY_STATE_ACTIVE) {
ps->pending_flush = 1;
return;
{
Proxy_Socket ps = (Proxy_Socket) s;
- while (ps->lock_freeze) ;
if (ps->state != PROXY_STATE_ACTIVE) {
ps->freeze = is_frozen;
return;
Proxy_Plug pp = (Proxy_Plug) p;
Proxy_Socket ps = pp->proxy_socket;
- while (ps->lock_closing) ;
if (ps->state != PROXY_STATE_ACTIVE) {
ps->closing_error_msg = error_msg;
ps->closing_error_code = error_code;
Proxy_Plug pp = (Proxy_Plug) p;
Proxy_Socket ps = pp->proxy_socket;
- while (ps->lock_receive) ;
if (ps->state != PROXY_STATE_ACTIVE) {
/* we will lose the urgentness of this data, but since most,
* if not all, of this data will be consumed by the negotiation
Proxy_Plug pp = (Proxy_Plug) p;
Proxy_Socket ps = pp->proxy_socket;
- while (ps->lock_sent) ;
if (ps->state != PROXY_STATE_ACTIVE) {
ps->sent_bufsize = bufsize;
ps->negotiate(ps, PROXY_CHANGE_SENT);
Proxy_Plug pp = (Proxy_Plug) p;
Proxy_Socket ps = pp->proxy_socket;
- while (ps->lock_accepting) ;
if (ps->state != PROXY_STATE_ACTIVE) {
ps->accepting_sock = sock;
return ps->negotiate(ps, PROXY_CHANGE_ACCEPTING);
bufchain_init(&ret->pending_output_data);
bufchain_init(&ret->pending_oob_output_data);
- ret->lock_close =
- ret->lock_write =
- ret->lock_write_oob =
- ret->lock_receive =
- ret->lock_flush =
- ret->lock_closing =
- ret->lock_sent =
- ret->lock_accepting = 0;
-
ret->sub_socket = NULL;
ret->state = PROXY_STATE_NEW;
if (cfg.proxy_type == PROXY_HTTP) {
ret->negotiate = proxy_http_negotiate;
} else if (cfg.proxy_type == PROXY_SOCKS) {
- ret->negotiate = proxy_socks_negotiate;
+ if (cfg.proxy_socks_version == 4)
+ ret->negotiate = proxy_socks4_negotiate;
+ else
+ ret->negotiate = proxy_socks5_negotiate;
} else if (cfg.proxy_type == PROXY_TELNET) {
ret->negotiate = proxy_telnet_negotiate;
} else {
* for this proxy method, it's just a simple HTTP
* request
*/
- char buf[1024], dest[21];
+ char buf[256], dest[64];
- sk_getaddr(p->remote_addr, dest, 20);
+ sk_getaddr(p->remote_addr, dest, 64);
- sprintf(buf, "CONNECT %s:%i HTTP/1.1\r\nHost: %s:%i\r\n\r\n",
+ sprintf(buf, "CONNECT %s:%i HTTP/1.1\r\nHost: %s:%i\r\n",
dest, p->remote_port, dest, p->remote_port);
sk_write(p->sub_socket, buf, strlen(buf));
- p->state = 1;
+ if (cfg.proxy_username[0] || cfg.proxy_password[0]) {
+ char buf[sizeof(cfg.proxy_username)+sizeof(cfg.proxy_password)];
+ char buf2[sizeof(buf)*4/3 + 100];
+ int i, j, len;
+ sprintf(buf, "%s:%s", cfg.proxy_username, cfg.proxy_password);
+ len = strlen(buf);
+ sprintf(buf2, "Proxy-Authorization: basic ");
+ for (i = 0, j = strlen(buf2); i < len; i += 3, j += 4)
+ base64_encode_atom(buf+i, (len-i > 3 ? 3 : len-i), buf2+j);
+ strcpy(buf2+j, "\r\n");
+ sk_write(p->sub_socket, buf2, strlen(buf2));
+ }
+
+ sprintf(buf, "\r\n");
+ sk_write(p->sub_socket, buf, strlen(buf));
+ p->state = 1;
return 0;
}
plug_closing(p->plug, "Network error: Unexpected proxy error",
PROXY_ERROR_UNEXPECTED, 0);
- return 0;
+ return 1;
}
/* ----------------------------------------------------------------------
- * SOCKS proxy type (as yet unimplemented).
+ * SOCKS proxy type.
*/
-int proxy_socks_negotiate (Proxy_Socket p, int change)
+/* SOCKS version 4 */
+int proxy_socks4_negotiate (Proxy_Socket p, int change)
{
- p->error = "Network error: SOCKS proxy implementation is incomplete";
- return 0;
+ if (p->state == PROXY_CHANGE_NEW) {
+
+ /* request format:
+ * version number (1 byte) = 4
+ * command code (1 byte)
+ * 1 = CONNECT
+ * 2 = BIND
+ * dest. port (2 bytes) [network order]
+ * dest. address (4 bytes)
+ * user ID (variable length, null terminated string)
+ */
+
+ int length;
+ char * command;
+
+ if (sk_addrtype(p->remote_addr) != AF_INET) {
+ plug_closing(p->plug, "Network error: SOCKS version 4 does not support IPv6",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ length = strlen(cfg.proxy_username) + 9;
+ command = (char*) malloc(length);
+ strcpy(command + 8, cfg.proxy_username);
+
+ command[0] = 4; /* version 4 */
+ command[1] = 1; /* CONNECT command */
+
+ /* port */
+ command[2] = (char) (p->remote_port >> 8) & 0xff;
+ command[3] = (char) p->remote_port & 0xff;
+
+ /* address */
+ sk_addrcopy(p->remote_addr, command + 4);
+
+ sk_write(p->sub_socket, command, length);
+ free(command);
+
+ p->state = 1;
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_CLOSING) {
+ /* if our proxy negotiation process involves closing and opening
+ * new sockets, then we would want to intercept this closing
+ * callback when we were expecting it. if we aren't anticipating
+ * a socket close, then some error must have occurred. we'll
+ * just pass those errors up to the backend.
+ */
+ return plug_closing(p->plug, p->closing_error_msg,
+ p->closing_error_code,
+ p->closing_calling_back);
+ }
+
+ if (change == PROXY_CHANGE_SENT) {
+ /* some (or all) of what we wrote to the proxy was sent.
+ * we don't do anything new, however, until we receive the
+ * proxy's response. we might want to set a timer so we can
+ * timeout the proxy negotiation after a while...
+ */
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_ACCEPTING) {
+ /* we should _never_ see this, as we are using our socket to
+ * connect to a proxy, not accepting inbound connections.
+ * what should we do? close the socket with an appropriate
+ * error message?
+ */
+ return plug_accepting(p->plug, p->accepting_sock);
+ }
+
+ if (change == PROXY_CHANGE_RECEIVE) {
+ /* we have received data from the underlying socket, which
+ * we'll need to parse, process, and respond to appropriately.
+ */
+
+ if (p->state == 1) {
+ /* response format:
+ * version number (1 byte) = 4
+ * reply code (1 byte)
+ * 90 = request granted
+ * 91 = request rejected or failed
+ * 92 = request rejected due to lack of IDENTD on client
+ * 93 = request rejected due to difference in user ID
+ * (what we sent vs. what IDENTD said)
+ * dest. port (2 bytes)
+ * dest. address (4 bytes)
+ */
+
+ char *data;
+ int len;
+
+ /* get the response */
+ bufchain_prefix(&p->pending_input_data, &data, &len);
+
+ if (data[0] != 0) {
+ plug_closing(p->plug, "Network error: SOCKS proxy responded with "
+ "unexpected reply code version",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (data[1] != 90) {
+
+ switch (data[1]) {
+ case 92:
+ plug_closing(p->plug, "Network error: SOCKS server wanted IDENTD on client",
+ PROXY_ERROR_GENERAL, 0);
+ break;
+ case 93:
+ plug_closing(p->plug, "Network error: Username and IDENTD on client don't agree",
+ PROXY_ERROR_GENERAL, 0);
+ break;
+ case 91:
+ default:
+ plug_closing(p->plug, "Network error: Error while communicating with proxy",
+ PROXY_ERROR_GENERAL, 0);
+ break;
+ }
+
+ return 1;
+ }
+ bufchain_consume(&p->pending_input_data, 2);
+
+ /* we're done */
+ proxy_activate(p);
+ /* proxy activate will have dealt with
+ * whatever is left of the buffer */
+ return 1;
+ }
+ }
+
+ plug_closing(p->plug, "Network error: Unexpected proxy error",
+ PROXY_ERROR_UNEXPECTED, 0);
+ return 1;
+}
+
+/* SOCKS version 5 */
+int proxy_socks5_negotiate (Proxy_Socket p, int change)
+{
+ if (p->state == PROXY_CHANGE_NEW) {
+
+ /* initial command:
+ * version number (1 byte) = 5
+ * number of available authentication methods (1 byte)
+ * available authentication methods (1 byte * previous value)
+ * authentication methods:
+ * 0x00 = no authentication
+ * 0x01 = GSSAPI
+ * 0x02 = username/password
+ * 0x03 = CHAP
+ */
+
+ char command[4];
+ int len;
+
+ command[0] = 5; /* version 5 */
+ if (cfg.proxy_username[0] || cfg.proxy_password[0]) {
+ command[1] = 2; /* two methods supported: */
+ command[2] = 0x00; /* no authentication */
+ command[3] = 0x02; /* username/password */
+ len = 4;
+ } else {
+ command[1] = 1; /* one methods supported: */
+ command[2] = 0x00; /* no authentication */
+ len = 3;
+ }
+
+ sk_write(p->sub_socket, command, len);
+
+ p->state = 1;
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_CLOSING) {
+ /* if our proxy negotiation process involves closing and opening
+ * new sockets, then we would want to intercept this closing
+ * callback when we were expecting it. if we aren't anticipating
+ * a socket close, then some error must have occurred. we'll
+ * just pass those errors up to the backend.
+ */
+ return plug_closing(p->plug, p->closing_error_msg,
+ p->closing_error_code,
+ p->closing_calling_back);
+ }
+
+ if (change == PROXY_CHANGE_SENT) {
+ /* some (or all) of what we wrote to the proxy was sent.
+ * we don't do anything new, however, until we receive the
+ * proxy's response. we might want to set a timer so we can
+ * timeout the proxy negotiation after a while...
+ */
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_ACCEPTING) {
+ /* we should _never_ see this, as we are using our socket to
+ * connect to a proxy, not accepting inbound connections.
+ * what should we do? close the socket with an appropriate
+ * error message?
+ */
+ return plug_accepting(p->plug, p->accepting_sock);
+ }
+
+ if (change == PROXY_CHANGE_RECEIVE) {
+ /* we have received data from the underlying socket, which
+ * we'll need to parse, process, and respond to appropriately.
+ */
+
+ char *data;
+ int len;
+
+ if (p->state == 1) {
+
+ /* initial response:
+ * version number (1 byte) = 5
+ * authentication method (1 byte)
+ * authentication methods:
+ * 0x00 = no authentication
+ * 0x01 = GSSAPI
+ * 0x02 = username/password
+ * 0x03 = CHAP
+ * 0xff = no acceptable methods
+ */
+
+ /* get the response */
+ bufchain_prefix(&p->pending_input_data, &data, &len);
+
+ if (data[0] != 5) {
+ plug_closing(p->plug, "Network error: Error while communicating with proxy",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (data[1] == 0x00) p->state = 2; /* no authentication needed */
+ else if (data[1] == 0x01) p->state = 4; /* GSSAPI authentication */
+ else if (data[1] == 0x02) p->state = 5; /* username/password authentication */
+ else if (data[1] == 0x03) p->state = 6; /* CHAP authentication */
+ else {
+ plug_closing(p->plug, "Network error: We don't support any of the SOCKS "
+ "server's authentication methods",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+ bufchain_consume(&p->pending_input_data, 2);
+ }
+
+ if (p->state == 7) {
+
+ /* password authentication reply format:
+ * version number (1 bytes) = 1
+ * reply code (1 byte)
+ * 0 = succeeded
+ * >0 = failed
+ */
+
+ /* get the response */
+ bufchain_prefix(&p->pending_input_data, &data, &len);
+
+ if (data[0] != 1) {
+ plug_closing(p->plug, "Network error: Error while communicating with proxy",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (data[1] != 0) {
+
+ plug_closing(p->plug, "Network error: Proxy refused authentication",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ bufchain_consume(&p->pending_input_data, 2);
+ p->state = 2; /* now proceed as authenticated */
+ }
+
+ if (p->state == 2) {
+
+ /* request format:
+ * version number (1 byte) = 5
+ * command code (1 byte)
+ * 1 = CONNECT
+ * 2 = BIND
+ * 3 = UDP ASSOCIATE
+ * reserved (1 byte) = 0x00
+ * address type (1 byte)
+ * 1 = IPv4
+ * 3 = domainname (first byte has length, no terminating null)
+ * 4 = IPv6
+ * dest. address (variable)
+ * dest. port (2 bytes) [network order]
+ */
+
+ char command[22];
+ int len;
+
+ if (sk_addrtype(p->remote_addr) == AF_INET) {
+ len = 10;
+ command[3] = 1; /* IPv4 */
+ } else {
+ len = 22;
+ command[3] = 4; /* IPv6 */
+ }
+
+ command[0] = 5; /* version 5 */
+ command[1] = 1; /* CONNECT command */
+ command[2] = 0x00;
+
+ /* address */
+ sk_addrcopy(p->remote_addr, command+4);
+
+ /* port */
+ command[len-2] = (char) (p->remote_port >> 8) & 0xff;
+ command[len-1] = (char) p->remote_port & 0xff;
+
+ sk_write(p->sub_socket, command, len);
+
+ p->state = 3;
+ return 1;
+ }
+
+ if (p->state == 3) {
+
+ /* reply format:
+ * version number (1 bytes) = 5
+ * reply code (1 byte)
+ * 0 = succeeded
+ * 1 = general SOCKS server failure
+ * 2 = connection not allowed by ruleset
+ * 3 = network unreachable
+ * 4 = host unreachable
+ * 5 = connection refused
+ * 6 = TTL expired
+ * 7 = command not supported
+ * 8 = address type not supported
+ * reserved (1 byte) = x00
+ * address type (1 byte)
+ * 1 = IPv4
+ * 3 = domainname (first byte has length, no terminating null)
+ * 4 = IPv6
+ * server bound address (variable)
+ * server bound port (2 bytes) [network order]
+ */
+
+ /* get the response */
+ bufchain_prefix(&p->pending_input_data, &data, &len);
+
+ if (data[0] != 5) {
+ plug_closing(p->plug, "Network error: Error while communicating with proxy",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (data[1] != 0) {
+
+ switch (data[1]) {
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7:
+ case 8:
+ default:
+ plug_closing(p->plug, "Network error: Error while communicating with proxy",
+ PROXY_ERROR_GENERAL, 0);
+ break;
+ }
+
+ return 1;
+ }
+
+ /* we're done */
+ proxy_activate(p);
+ /* proxy activate will have dealt with
+ * whatever is left of the buffer */
+ return 1;
+ }
+
+ if (p->state == 4) {
+ /* TODO: Handle GSSAPI authentication */
+ plug_closing(p->plug, "Network error: We don't support GSSAPI authentication",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (p->state == 5) {
+ if (cfg.proxy_username[0] || cfg.proxy_password[0]) {
+ char userpwbuf[514];
+ int ulen, plen;
+ ulen = strlen(cfg.proxy_username);
+ if (ulen > 255) ulen = 255; if (ulen < 1) ulen = 1;
+ plen = strlen(cfg.proxy_password);
+ if (plen > 255) plen = 255; if (plen < 1) plen = 1;
+ userpwbuf[0] = 1; /* version number of subnegotiation */
+ userpwbuf[1] = ulen;
+ memcpy(userpwbuf+2, cfg.proxy_username, ulen);
+ userpwbuf[ulen+2] = plen;
+ memcpy(userpwbuf+ulen+3, cfg.proxy_password, plen);
+ sk_write(p->sub_socket, userpwbuf, ulen + plen + 3);
+ p->state = 7;
+ } else
+ plug_closing(p->plug, "Network error: Server chose "
+ "username/password authentication but we "
+ "didn't offer it!",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ if (p->state == 6) {
+ /* TODO: Handle CHAP authentication */
+ plug_closing(p->plug, "Network error: We don't support CHAP authentication",
+ PROXY_ERROR_GENERAL, 0);
+ return 1;
+ }
+
+ }
+
+ plug_closing(p->plug, "Network error: Unexpected proxy error",
+ PROXY_ERROR_UNEXPECTED, 0);
+ return 1;
}
/* ----------------------------------------------------------------------
- * `Telnet' proxy type (as yet unimplemented).
+ * `Telnet' proxy type.
*
* (This is for ad-hoc proxies where you connect to the proxy's
* telnet port and send a command such as `connect host port'. The
int proxy_telnet_negotiate (Proxy_Socket p, int change)
{
- p->error = "Network error: Telnet proxy implementation is incomplete";
- return 0;
+ if (p->state == PROXY_CHANGE_NEW) {
+
+ int so = 0, eo = 0;
+
+ /* we need to escape \\, \%, \r, \n, \t, \x??, \0???,
+ * %%, %host, and %port
+ */
+
+ while (cfg.proxy_telnet_command[eo] != 0) {
+
+ /* scan forward until we hit end-of-line,
+ * or an escape character (\ or %) */
+ while (cfg.proxy_telnet_command[eo] != 0 &&
+ cfg.proxy_telnet_command[eo] != '%' &&
+ cfg.proxy_telnet_command[eo] != '\\') eo++;
+
+ /* if we hit eol, break out of our escaping loop */
+ if (cfg.proxy_telnet_command[eo] == 0) break;
+
+ /* if there was any unescaped text before the escape
+ * character, send that now */
+ if (eo != so) {
+ sk_write(p->sub_socket,
+ cfg.proxy_telnet_command + so, eo - so);
+ }
+
+ so = eo++;
+
+ /* if the escape character was the last character of
+ * the line, we'll just stop and send it. */
+ if (cfg.proxy_telnet_command[eo] == 0) break;
+
+ if (cfg.proxy_telnet_command[so] == '\\') {
+
+ /* we recognize \\, \%, \r, \n, \t, \x??.
+ * anything else, we just send unescaped (including the \).
+ */
+
+ switch (cfg.proxy_telnet_command[eo]) {
+
+ case '\\':
+ sk_write(p->sub_socket, "\\", 1);
+ eo++;
+ break;
+
+ case '%':
+ sk_write(p->sub_socket, "%%", 1);
+ eo++;
+ break;
+
+ case 'r':
+ sk_write(p->sub_socket, "\r", 1);
+ eo++;
+ break;
+
+ case 'n':
+ sk_write(p->sub_socket, "\n", 1);
+ eo++;
+ break;
+
+ case 't':
+ sk_write(p->sub_socket, "\t", 1);
+ eo++;
+ break;
+
+ case 'x':
+ case 'X':
+ {
+ /* escaped hexadecimal value (ie. \xff) */
+ unsigned char v = 0;
+ int i = 0;
+
+ for (;;) {
+ eo++;
+ if (cfg.proxy_telnet_command[eo] >= '0' &&
+ cfg.proxy_telnet_command[eo] <= '9')
+ v += cfg.proxy_telnet_command[eo] - '0';
+ else if (cfg.proxy_telnet_command[eo] >= 'a' &&
+ cfg.proxy_telnet_command[eo] <= 'f')
+ v += cfg.proxy_telnet_command[eo] - 'a' + 10;
+ else if (cfg.proxy_telnet_command[eo] >= 'A' &&
+ cfg.proxy_telnet_command[eo] <= 'F')
+ v += cfg.proxy_telnet_command[eo] - 'A' + 10;
+ else {
+ /* non hex character, so we abort and just
+ * send the whole thing unescaped (including \x)
+ */
+ sk_write(p->sub_socket, "\\", 1);
+ eo = so + 1;
+ break;
+ }
+
+ /* we only extract two hex characters */
+ if (i == 1) {
+ sk_write(p->sub_socket, &v, 1);
+ eo++;
+ break;
+ }
+
+ i++;
+ v <<= 4;
+ }
+ }
+ break;
+
+ default:
+ sk_write(p->sub_socket,
+ cfg.proxy_telnet_command + so, 2);
+ eo++;
+ break;
+ }
+ } else {
+
+ /* % escape. we recognize %%, %host, %port. anything else,
+ * we just send unescaped (including the %). */
+
+ if (cfg.proxy_telnet_command[eo] == '%') {
+ sk_write(p->sub_socket, "%", 1);
+ eo++;
+ }
+ else if (strnicmp(cfg.proxy_telnet_command + eo,
+ "host", 4) == 0) {
+ char dest[64];
+ sk_getaddr(p->remote_addr, dest, 64);
+ sk_write(p->sub_socket, dest, strlen(dest));
+ eo += 4;
+ }
+ else if (strnicmp(cfg.proxy_telnet_command + eo,
+ "port", 4) == 0) {
+ char port[8];
+ sprintf(port, "%i", p->remote_port);
+ sk_write(p->sub_socket, port, strlen(port));
+ eo += 4;
+ }
+ else {
+ /* we don't escape this, so send the % now, and
+ * don't advance eo, so that we'll consider the
+ * text immediately following the % as unescaped.
+ */
+ sk_write(p->sub_socket, "%", 1);
+ }
+ }
+
+ /* resume scanning for additional escapes after this one. */
+ so = eo;
+ }
+
+ /* if there is any unescaped text at the end of the line, send it */
+ if (eo != so) {
+ sk_write(p->sub_socket, cfg.proxy_telnet_command + so, eo - so);
+ }
+
+ p->state = 1;
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_CLOSING) {
+ /* if our proxy negotiation process involves closing and opening
+ * new sockets, then we would want to intercept this closing
+ * callback when we were expecting it. if we aren't anticipating
+ * a socket close, then some error must have occurred. we'll
+ * just pass those errors up to the backend.
+ */
+ return plug_closing(p->plug, p->closing_error_msg,
+ p->closing_error_code,
+ p->closing_calling_back);
+ }
+
+ if (change == PROXY_CHANGE_SENT) {
+ /* some (or all) of what we wrote to the proxy was sent.
+ * we don't do anything new, however, until we receive the
+ * proxy's response. we might want to set a timer so we can
+ * timeout the proxy negotiation after a while...
+ */
+ return 0;
+ }
+
+ if (change == PROXY_CHANGE_ACCEPTING) {
+ /* we should _never_ see this, as we are using our socket to
+ * connect to a proxy, not accepting inbound connections.
+ * what should we do? close the socket with an appropriate
+ * error message?
+ */
+ return plug_accepting(p->plug, p->accepting_sock);
+ }
+
+ if (change == PROXY_CHANGE_RECEIVE) {
+ /* we have received data from the underlying socket, which
+ * we'll need to parse, process, and respond to appropriately.
+ */
+
+ /* we're done */
+ proxy_activate(p);
+ /* proxy activate will have dealt with
+ * whatever is left of the buffer */
+ return 1;
+ }
+
+ plug_closing(p->plug, "Network error: Unexpected proxy error",
+ PROXY_ERROR_UNEXPECTED, 0);
+ return 1;
}
projects / u / mdw / putty / blobdiff