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Justin Bradford's proxy support patch. Currently supports only HTTP

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CONNECT, but contains an extensible framework to allow other
proxies. Apparently SOCKS and ad-hoc-telnet-proxy are already
planned (the GUI mentions them already even though they don't work
yet). GUI includes full configurability and allows definition of
exclusion zones. Rock and roll.

[originally from svn r1598]
This commit is contained in:
Simon Tatham
2002-03-23 17:47:21 +00:00
parent 869989e7e6
commit eabd704d1e
15 changed files with 935 additions and 18 deletions
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119
proxy.h Normal file
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/*
* Network proxy abstraction in PuTTY
*
* A proxy layer, if necessary, wedges itself between the
* network code and the higher level backend.
*
* Supported proxies: HTTP CONNECT, generic telnet
* In progress: SOCKS
*/
#ifndef PUTTY_PROXY_H
#define PUTTY_PROXY_H
#define PROXY_ERROR_GENERAL 8000
#define PROXY_ERROR_UNEXPECTED 8001
typedef struct Socket_proxy_tag * Proxy_Socket;
struct Socket_proxy_tag {
struct socket_function_table *fn;
/* the above variable absolutely *must* be the first in this structure */
char * error;
Socket sub_socket;
Plug plug;
SockAddr remote_addr;
int remote_port;
bufchain pending_output_data;
bufchain pending_oob_output_data;
int pending_flush;
bufchain pending_input_data;
#define PROXY_STATE_NEW -1
#define PROXY_STATE_ACTIVE 0
int state; /* proxy states greater than 0 are implementation
* dependent, but represent various stages/states
* of the initialization/setup/negotiation with the
* proxy server.
*/
int freeze; /* should we freeze the underlying socket when
* we are done with the proxy negotiation? this
* simply caches the value of sk_set_frozen calls.
*/
#define PROXY_CHANGE_NEW -1
#define PROXY_CHANGE_CLOSING 0
#define PROXY_CHANGE_SENT 1
#define PROXY_CHANGE_RECEIVE 2
#define PROXY_CHANGE_ACCEPTING 3
/* something has changed (a call from the sub socket
* layer into our Proxy Plug layer, or we were just
* created, etc), so the proxy layer needs to handle
* this change (the type of which is the second argument)
* and further the proxy negotiation process.
*/
int (*negotiate) (Proxy_Socket /* this */, int /* change type */);
/* current arguments of plug handlers
* (for use by proxy's negotiate function)
*/
/* closing */
char *closing_error_msg;
int closing_error_code;
int closing_calling_back;
/* receive */
int receive_urgent;
char *receive_data;
int receive_len;
/* sent */
int sent_bufsize;
/* accepting */
void *accepting_sock;
/* spin locks, for the critical switch from negotiating
* to active state. we have to dump all of our pending
* buffers without new events (read, writes, etc) corrupting
* things. we should not have built up a large amount of
* pending data during negotiation, so hopefully this will
* not have a large effect on performance.
*/
char lock_close;
char lock_write;
char lock_write_oob;
char lock_receive;
char lock_flush;
char lock_closing;
char lock_sent;
char lock_accepting;
char lock_freeze;
};
typedef struct Plug_proxy_tag * Proxy_Plug;
struct Plug_proxy_tag {
struct plug_function_table *fn;
/* the above variable absolutely *must* be the first in this structure */
Proxy_Socket proxy_socket;
};
extern void proxy_activate (Proxy_Socket);
extern int proxy_http_negotiate (Proxy_Socket, int);
extern int proxy_telnet_negotiate (Proxy_Socket, int);
extern int proxy_socks_negotiate (Proxy_Socket, int);
#endif