f26d5c33 |
1 | #include <windows.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
4 | |
5 | #include "putty.h" |
6 | #include "ssh.h" |
7 | |
8 | #ifndef FALSE |
9 | #define FALSE 0 |
10 | #endif |
11 | #ifndef TRUE |
12 | #define TRUE 1 |
13 | #endif |
14 | |
15 | #define GET_32BIT_LSB_FIRST(cp) \ |
16 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
17 | ((unsigned long)(unsigned char)(cp)[1] << 8) | \ |
18 | ((unsigned long)(unsigned char)(cp)[2] << 16) | \ |
19 | ((unsigned long)(unsigned char)(cp)[3] << 24)) |
20 | |
21 | #define PUT_32BIT_LSB_FIRST(cp, value) ( \ |
22 | (cp)[0] = (value), \ |
23 | (cp)[1] = (value) >> 8, \ |
24 | (cp)[2] = (value) >> 16, \ |
25 | (cp)[3] = (value) >> 24 ) |
26 | |
27 | #define GET_16BIT_LSB_FIRST(cp) \ |
28 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
29 | ((unsigned long)(unsigned char)(cp)[1] << 8)) |
30 | |
31 | #define PUT_16BIT_LSB_FIRST(cp, value) ( \ |
32 | (cp)[0] = (value), \ |
33 | (cp)[1] = (value) >> 8 ) |
34 | |
35 | #define GET_32BIT_MSB_FIRST(cp) \ |
36 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
37 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
38 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
39 | ((unsigned long)(unsigned char)(cp)[3])) |
40 | |
41 | #define PUT_32BIT_MSB_FIRST(cp, value) ( \ |
42 | (cp)[0] = (value) >> 24, \ |
43 | (cp)[1] = (value) >> 16, \ |
44 | (cp)[2] = (value) >> 8, \ |
45 | (cp)[3] = (value) ) |
46 | |
47 | #define GET_16BIT_MSB_FIRST(cp) \ |
48 | (((unsigned long)(unsigned char)(cp)[0] << 8) | \ |
49 | ((unsigned long)(unsigned char)(cp)[1])) |
50 | |
51 | #define PUT_16BIT_MSB_FIRST(cp, value) ( \ |
52 | (cp)[0] = (value) >> 8, \ |
53 | (cp)[1] = (value) ) |
54 | |
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55 | struct pfwd_queue { |
56 | struct pfwd_queue *next; |
57 | char *buf; |
58 | }; |
59 | |
60 | struct PFwdPrivate { |
61 | struct plug_function_table *fn; |
62 | /* the above variable absolutely *must* be the first in this structure */ |
63 | void *c; /* (channel) data used by ssh.c */ |
64 | Socket s; |
65 | char hostname[128]; |
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66 | int throttled, throttle_override; |
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67 | int port; |
68 | int ready; |
69 | struct pfwd_queue *waiting; |
70 | }; |
71 | |
72 | void pfd_close(Socket s); |
73 | |
74 | |
75 | static int pfd_closing(Plug plug, char *error_msg, int error_code, |
76 | int calling_back) |
77 | { |
78 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
79 | |
80 | /* |
81 | * We have no way to communicate down the forwarded connection, |
82 | * so if an error occurred on the socket, we just ignore it |
83 | * and treat it like a proper close. |
84 | */ |
85 | sshfwd_close(pr->c); |
86 | pfd_close(pr->s); |
87 | return 1; |
88 | } |
89 | |
90 | static int pfd_receive(Plug plug, int urgent, char *data, int len) |
91 | { |
92 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
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93 | if (pr->ready) { |
94 | if (sshfwd_write(pr->c, data, len) > 0) { |
95 | pr->throttled = 1; |
96 | sk_set_frozen(pr->s, 1); |
97 | } |
98 | } |
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99 | return 1; |
100 | } |
101 | |
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102 | static void pfd_sent(Plug plug, int bufsize) |
103 | { |
104 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
105 | |
106 | sshfwd_unthrottle(pr->c, bufsize); |
107 | } |
108 | |
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109 | /* |
110 | * Called when receiving a PORT OPEN from the server |
111 | */ |
112 | char *pfd_newconnect(Socket *s, char *hostname, int port, void *c) |
113 | { |
114 | static struct plug_function_table fn_table = { |
115 | pfd_closing, |
116 | pfd_receive, |
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117 | pfd_sent, |
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118 | NULL |
119 | }; |
120 | |
121 | SockAddr addr; |
122 | char *err, *dummy_realhost; |
123 | struct PFwdPrivate *pr; |
124 | |
125 | /* |
126 | * Try to find host. |
127 | */ |
128 | addr = sk_namelookup(hostname, &dummy_realhost); |
129 | if ((err = sk_addr_error(addr))) |
130 | return err; |
131 | |
132 | /* |
133 | * Open socket. |
134 | */ |
135 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
136 | pr->fn = &fn_table; |
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137 | pr->throttled = pr->throttle_override = 0; |
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138 | pr->ready = 1; |
139 | pr->c = c; |
140 | |
141 | pr->s = *s = sk_new(addr, port, 0, 1, (Plug) pr); |
142 | if ((err = sk_socket_error(*s))) { |
143 | sfree(pr); |
144 | return err; |
145 | } |
146 | |
147 | sk_set_private_ptr(*s, pr); |
148 | sk_addr_free(addr); |
149 | return NULL; |
150 | } |
151 | |
152 | /* |
153 | called when someone connects to the local port |
154 | */ |
155 | |
bcce45ed |
156 | static int pfd_accepting(Plug p, void *sock) |
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157 | { |
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158 | static struct plug_function_table fn_table = { |
159 | pfd_closing, |
160 | pfd_receive, |
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161 | pfd_sent, |
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162 | NULL |
163 | }; |
164 | struct PFwdPrivate *pr, *org; |
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165 | Socket s; |
166 | char *err; |
167 | |
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168 | org = (struct PFwdPrivate *)p; |
169 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
170 | pr->fn = &fn_table; |
171 | |
172 | pr->c = NULL; |
173 | |
174 | pr->s = s = sk_register(sock, (Plug) pr); |
175 | if ((err = sk_socket_error(s))) { |
176 | sfree(pr); |
177 | return err != NULL; |
178 | } |
179 | |
180 | pr->c = new_sock_channel(s); |
181 | |
182 | strcpy(pr->hostname, org->hostname); |
183 | pr->port = org->port; |
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184 | pr->throttled = pr->throttle_override = 0; |
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185 | pr->ready = 0; |
186 | pr->waiting = NULL; |
187 | |
188 | sk_set_private_ptr(s, pr); |
189 | |
190 | if (pr->c == NULL) { |
191 | sfree(pr); |
192 | return 1; |
193 | } else { |
194 | /* asks to forward to the specified host/port for this */ |
195 | ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding"); |
196 | } |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | |
202 | /* Add a new forwarding from port -> desthost:destport |
bcce45ed |
203 | sets up a listener on the local machine on port |
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204 | */ |
205 | char *pfd_addforward(char *desthost, int destport, int port) |
206 | { |
207 | static struct plug_function_table fn_table = { |
208 | pfd_closing, |
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209 | pfd_receive, /* should not happen... */ |
210 | pfd_sent, /* also should not happen */ |
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211 | pfd_accepting |
212 | }; |
213 | |
214 | char *err; |
215 | struct PFwdPrivate *pr; |
216 | Socket s; |
217 | |
218 | /* |
219 | * Open socket. |
220 | */ |
221 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
222 | pr->fn = &fn_table; |
223 | pr->c = NULL; |
224 | strcpy(pr->hostname, desthost); |
225 | pr->port = destport; |
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226 | pr->throttled = pr->throttle_override = 0; |
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227 | pr->ready = 0; |
228 | pr->waiting = NULL; |
229 | |
bcce45ed |
230 | pr->s = s = sk_newlistener(port, (Plug) pr, !cfg.lport_acceptall); |
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231 | if ((err = sk_socket_error(s))) { |
232 | sfree(pr); |
233 | return err; |
234 | } |
235 | |
236 | sk_set_private_ptr(s, pr); |
237 | |
238 | return NULL; |
239 | } |
240 | |
241 | void pfd_close(Socket s) |
242 | { |
243 | struct PFwdPrivate *pr; |
244 | |
245 | if (!s) |
246 | return; |
247 | |
248 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
249 | |
250 | sfree(pr); |
251 | |
252 | sk_close(s); |
253 | } |
254 | |
5471d09a |
255 | void pfd_unthrottle(Socket s) |
256 | { |
257 | struct PFwdPrivate *pr; |
258 | if (!s) |
259 | return; |
260 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
261 | |
262 | pr->throttled = 0; |
263 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
264 | } |
265 | |
266 | void pfd_override_throttle(Socket s, int enable) |
267 | { |
268 | struct PFwdPrivate *pr; |
269 | if (!s) |
270 | return; |
271 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
272 | |
273 | pr->throttle_override = enable; |
274 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
275 | } |
276 | |
f26d5c33 |
277 | /* |
278 | * Called to send data down the raw connection. |
279 | */ |
5471d09a |
280 | int pfd_send(Socket s, char *data, int len) |
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281 | { |
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282 | if (s == NULL) |
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283 | return 0; |
284 | return sk_write(s, data, len); |
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285 | } |
286 | |
287 | |
288 | void pfd_confirm(Socket s) |
289 | { |
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290 | struct PFwdPrivate *pr; |
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291 | |
292 | if (s == NULL) |
293 | return; |
294 | |
5f2e19fc |
295 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
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296 | pr->ready = 1; |
297 | sk_set_frozen(s, 0); |
298 | sk_write(s, NULL, 0); |
299 | } |