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947962e0b9
data channels. Should comprehensively fix 'half-closed', in principle, though it's a big and complicated change and so there's a good chance I've made at least one mistake somewhere. All connections should now be rigorous about propagating end-of-file (or end-of-data-stream, or socket shutdown, or whatever) independently in both directions, except in frontends with no mechanism for sending explicit EOF (e.g. interactive terminal windows) or backends which are basically always used for interactive sessions so it's unlikely that an application would be depending on independent EOF (telnet, rlogin). EOF should now never accidentally be sent while there's still buffered data to go out before it. (May help fix 'portfwd-corrupt', and also I noticed recently that the ssh main session channel can accidentally have MSG_EOF sent before the output bufchain is clear, leading to embarrassment when it subsequently does send the output). [originally from svn r9279]
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* Network proxy abstraction in PuTTY
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*
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* A proxy layer, if necessary, wedges itself between the
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* network code and the higher level backend.
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*
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* Supported proxies: HTTP CONNECT, generic telnet, SOCKS 4 & 5
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*/
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#ifndef PUTTY_PROXY_H
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#define PUTTY_PROXY_H
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#define PROXY_ERROR_GENERAL 8000
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#define PROXY_ERROR_UNEXPECTED 8001
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typedef struct Socket_proxy_tag * Proxy_Socket;
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struct Socket_proxy_tag {
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const struct socket_function_table *fn;
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/* the above variable absolutely *must* be the first in this structure */
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char * error;
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Socket sub_socket;
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Plug plug;
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SockAddr remote_addr;
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int remote_port;
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bufchain pending_output_data;
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bufchain pending_oob_output_data;
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int pending_flush;
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bufchain pending_input_data;
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int pending_eof;
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#define PROXY_STATE_NEW -1
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#define PROXY_STATE_ACTIVE 0
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int state; /* proxy states greater than 0 are implementation
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* dependent, but represent various stages/states
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* of the initialization/setup/negotiation with the
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* proxy server.
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*/
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int freeze; /* should we freeze the underlying socket when
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* we are done with the proxy negotiation? this
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* simply caches the value of sk_set_frozen calls.
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*/
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#define PROXY_CHANGE_NEW -1
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#define PROXY_CHANGE_CLOSING 0
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#define PROXY_CHANGE_SENT 1
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#define PROXY_CHANGE_RECEIVE 2
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#define PROXY_CHANGE_ACCEPTING 3
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/* something has changed (a call from the sub socket
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* layer into our Proxy Plug layer, or we were just
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* created, etc), so the proxy layer needs to handle
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* this change (the type of which is the second argument)
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* and further the proxy negotiation process.
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*/
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int (*negotiate) (Proxy_Socket /* this */, int /* change type */);
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/* current arguments of plug handlers
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* (for use by proxy's negotiate function)
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*/
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/* closing */
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const char *closing_error_msg;
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int closing_error_code;
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int closing_calling_back;
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/* receive */
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int receive_urgent;
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char *receive_data;
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int receive_len;
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/* sent */
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int sent_bufsize;
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/* accepting */
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OSSocket accepting_sock;
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/* configuration, used to look up proxy settings */
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Conf *conf;
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/* CHAP transient data */
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int chap_num_attributes;
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int chap_num_attributes_processed;
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int chap_current_attribute;
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int chap_current_datalen;
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};
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typedef struct Plug_proxy_tag * Proxy_Plug;
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struct Plug_proxy_tag {
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const struct plug_function_table *fn;
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/* the above variable absolutely *must* be the first in this structure */
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Proxy_Socket proxy_socket;
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};
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extern void proxy_activate (Proxy_Socket);
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extern int proxy_http_negotiate (Proxy_Socket, int);
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extern int proxy_telnet_negotiate (Proxy_Socket, int);
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extern int proxy_socks4_negotiate (Proxy_Socket, int);
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extern int proxy_socks5_negotiate (Proxy_Socket, int);
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/*
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* This may be reused by local-command proxies on individual
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* platforms.
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*/
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char *format_telnet_command(SockAddr addr, int port, Conf *conf);
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/*
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* These are implemented in cproxy.c or nocproxy.c, depending on
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* whether encrypted proxy authentication is available.
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*/
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extern void proxy_socks5_offerencryptedauth(char *command, int *len);
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extern int proxy_socks5_handlechap (Proxy_Socket p);
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extern int proxy_socks5_selectchap(Proxy_Socket p);
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#endif
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