mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-08 08:58:00 +00:00
5d718ef64b
The number of people has been steadily increasing who read our source
code with an editor that thinks tab stops are 4 spaces apart, as
opposed to the traditional tty-derived 8 that the PuTTY code expects.
So I've been wondering for ages about just fixing it, and switching to
a spaces-only policy throughout the code. And I recently found out
about 'git blame -w', which should make this change not too disruptive
for the purposes of source-control archaeology; so perhaps now is the
time.
While I'm at it, I've also taken the opportunity to remove all the
trailing spaces from source lines (on the basis that git dislikes
them, and is the only thing that seems to have a strong opinion one
way or the other).
Apologies to anyone downstream of this code who has complicated patch
sets to rebase past this change. I don't intend it to be needed again.
112 lines
3.0 KiB
C
112 lines
3.0 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 ProxySocket ProxySocket;
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struct ProxySocket {
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const 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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bufchain pending_input_data;
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bool 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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bool 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) (ProxySocket * /* 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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bool closing_calling_back;
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/* receive */
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bool receive_urgent;
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const char *receive_data;
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int receive_len;
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/* accepting */
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accept_fn_t accepting_constructor;
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accept_ctx_t accepting_ctx;
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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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Socket sock;
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Plug plugimpl;
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};
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extern void proxy_activate (ProxySocket *);
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extern int proxy_http_negotiate (ProxySocket *, int);
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extern int proxy_telnet_negotiate (ProxySocket *, int);
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extern int proxy_socks4_negotiate (ProxySocket *, int);
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extern int proxy_socks5_negotiate (ProxySocket *, 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(BinarySink *);
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extern int proxy_socks5_handlechap (ProxySocket *);
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extern int proxy_socks5_selectchap(ProxySocket *);
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#endif
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