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Commit | Line | Data |
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1c1af145 | 1 | /* |
2 | * Network proxy abstraction in PuTTY | |
3 | * | |
4 | * A proxy layer, if necessary, wedges itself between the | |
5 | * network code and the higher level backend. | |
6 | * | |
7 | * Supported proxies: HTTP CONNECT, generic telnet, SOCKS 4 & 5 | |
8 | */ | |
9 | ||
10 | #ifndef PUTTY_PROXY_H | |
11 | #define PUTTY_PROXY_H | |
12 | ||
13 | #define PROXY_ERROR_GENERAL 8000 | |
14 | #define PROXY_ERROR_UNEXPECTED 8001 | |
15 | ||
16 | typedef struct Socket_proxy_tag * Proxy_Socket; | |
17 | ||
18 | struct Socket_proxy_tag { | |
19 | const struct socket_function_table *fn; | |
20 | /* the above variable absolutely *must* be the first in this structure */ | |
21 | ||
22 | char * error; | |
23 | ||
24 | Socket sub_socket; | |
25 | Plug plug; | |
26 | SockAddr remote_addr; | |
27 | int remote_port; | |
28 | ||
29 | bufchain pending_output_data; | |
30 | bufchain pending_oob_output_data; | |
31 | int pending_flush; | |
32 | bufchain pending_input_data; | |
33 | ||
34 | #define PROXY_STATE_NEW -1 | |
35 | #define PROXY_STATE_ACTIVE 0 | |
36 | ||
37 | int state; /* proxy states greater than 0 are implementation | |
38 | * dependent, but represent various stages/states | |
39 | * of the initialization/setup/negotiation with the | |
40 | * proxy server. | |
41 | */ | |
42 | int freeze; /* should we freeze the underlying socket when | |
43 | * we are done with the proxy negotiation? this | |
44 | * simply caches the value of sk_set_frozen calls. | |
45 | */ | |
46 | ||
47 | #define PROXY_CHANGE_NEW -1 | |
48 | #define PROXY_CHANGE_CLOSING 0 | |
49 | #define PROXY_CHANGE_SENT 1 | |
50 | #define PROXY_CHANGE_RECEIVE 2 | |
51 | #define PROXY_CHANGE_ACCEPTING 3 | |
52 | ||
53 | /* something has changed (a call from the sub socket | |
54 | * layer into our Proxy Plug layer, or we were just | |
55 | * created, etc), so the proxy layer needs to handle | |
56 | * this change (the type of which is the second argument) | |
57 | * and further the proxy negotiation process. | |
58 | */ | |
59 | ||
60 | int (*negotiate) (Proxy_Socket /* this */, int /* change type */); | |
61 | ||
62 | /* current arguments of plug handlers | |
63 | * (for use by proxy's negotiate function) | |
64 | */ | |
65 | ||
66 | /* closing */ | |
67 | const char *closing_error_msg; | |
68 | int closing_error_code; | |
69 | int closing_calling_back; | |
70 | ||
71 | /* receive */ | |
72 | int receive_urgent; | |
73 | char *receive_data; | |
74 | int receive_len; | |
75 | ||
76 | /* sent */ | |
77 | int sent_bufsize; | |
78 | ||
79 | /* accepting */ | |
80 | OSSocket accepting_sock; | |
81 | ||
82 | /* configuration, used to look up proxy settings */ | |
83 | Config cfg; | |
84 | ||
85 | /* CHAP transient data */ | |
86 | int chap_num_attributes; | |
87 | int chap_num_attributes_processed; | |
88 | int chap_current_attribute; | |
89 | int chap_current_datalen; | |
90 | }; | |
91 | ||
92 | typedef struct Plug_proxy_tag * Proxy_Plug; | |
93 | ||
94 | struct Plug_proxy_tag { | |
95 | const struct plug_function_table *fn; | |
96 | /* the above variable absolutely *must* be the first in this structure */ | |
97 | ||
98 | Proxy_Socket proxy_socket; | |
99 | ||
100 | }; | |
101 | ||
102 | extern void proxy_activate (Proxy_Socket); | |
103 | ||
104 | extern int proxy_http_negotiate (Proxy_Socket, int); | |
105 | extern int proxy_telnet_negotiate (Proxy_Socket, int); | |
106 | extern int proxy_socks4_negotiate (Proxy_Socket, int); | |
107 | extern int proxy_socks5_negotiate (Proxy_Socket, int); | |
108 | ||
109 | /* | |
110 | * This may be reused by local-command proxies on individual | |
111 | * platforms. | |
112 | */ | |
113 | char *format_telnet_command(SockAddr addr, int port, const Config *cfg); | |
114 | ||
115 | /* | |
116 | * These are implemented in cproxy.c or nocproxy.c, depending on | |
117 | * whether encrypted proxy authentication is available. | |
118 | */ | |
119 | extern void proxy_socks5_offerencryptedauth(char *command, int *len); | |
120 | extern int proxy_socks5_handlechap (Proxy_Socket p); | |
121 | extern int proxy_socks5_selectchap(Proxy_Socket p); | |
122 | ||
123 | #endif |