f26d5c33 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | |
4 | #include "putty.h" |
5 | #include "ssh.h" |
6 | |
7 | #ifndef FALSE |
8 | #define FALSE 0 |
9 | #endif |
10 | #ifndef TRUE |
11 | #define TRUE 1 |
12 | #endif |
13 | |
14 | #define GET_32BIT_LSB_FIRST(cp) \ |
15 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
16 | ((unsigned long)(unsigned char)(cp)[1] << 8) | \ |
17 | ((unsigned long)(unsigned char)(cp)[2] << 16) | \ |
18 | ((unsigned long)(unsigned char)(cp)[3] << 24)) |
19 | |
20 | #define PUT_32BIT_LSB_FIRST(cp, value) ( \ |
21 | (cp)[0] = (value), \ |
22 | (cp)[1] = (value) >> 8, \ |
23 | (cp)[2] = (value) >> 16, \ |
24 | (cp)[3] = (value) >> 24 ) |
25 | |
26 | #define GET_16BIT_LSB_FIRST(cp) \ |
27 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
28 | ((unsigned long)(unsigned char)(cp)[1] << 8)) |
29 | |
30 | #define PUT_16BIT_LSB_FIRST(cp, value) ( \ |
31 | (cp)[0] = (value), \ |
32 | (cp)[1] = (value) >> 8 ) |
33 | |
34 | #define GET_32BIT_MSB_FIRST(cp) \ |
35 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
36 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
37 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
38 | ((unsigned long)(unsigned char)(cp)[3])) |
39 | |
40 | #define PUT_32BIT_MSB_FIRST(cp, value) ( \ |
41 | (cp)[0] = (value) >> 24, \ |
42 | (cp)[1] = (value) >> 16, \ |
43 | (cp)[2] = (value) >> 8, \ |
44 | (cp)[3] = (value) ) |
45 | |
46 | #define GET_16BIT_MSB_FIRST(cp) \ |
47 | (((unsigned long)(unsigned char)(cp)[0] << 8) | \ |
48 | ((unsigned long)(unsigned char)(cp)[1])) |
49 | |
50 | #define PUT_16BIT_MSB_FIRST(cp, value) ( \ |
51 | (cp)[0] = (value) >> 8, \ |
52 | (cp)[1] = (value) ) |
53 | |
f26d5c33 |
54 | struct pfwd_queue { |
55 | struct pfwd_queue *next; |
56 | char *buf; |
57 | }; |
58 | |
59 | struct PFwdPrivate { |
c85623f9 |
60 | const struct plug_function_table *fn; |
f26d5c33 |
61 | /* the above variable absolutely *must* be the first in this structure */ |
62 | void *c; /* (channel) data used by ssh.c */ |
6b78788a |
63 | void *backhandle; /* instance of SSH backend itself */ |
64 | /* Note that backhandle need not be filled in if c is non-NULL */ |
f26d5c33 |
65 | Socket s; |
66 | char hostname[128]; |
5471d09a |
67 | int throttled, throttle_override; |
f26d5c33 |
68 | int port; |
69 | int ready; |
70 | struct pfwd_queue *waiting; |
71 | }; |
72 | |
f26d5c33 |
73 | |
74 | static int pfd_closing(Plug plug, char *error_msg, int error_code, |
75 | int calling_back) |
76 | { |
77 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
78 | |
79 | /* |
80 | * We have no way to communicate down the forwarded connection, |
81 | * so if an error occurred on the socket, we just ignore it |
82 | * and treat it like a proper close. |
83 | */ |
84 | sshfwd_close(pr->c); |
85 | pfd_close(pr->s); |
86 | return 1; |
87 | } |
88 | |
89 | static int pfd_receive(Plug plug, int urgent, char *data, int len) |
90 | { |
91 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
5471d09a |
92 | if (pr->ready) { |
93 | if (sshfwd_write(pr->c, data, len) > 0) { |
94 | pr->throttled = 1; |
95 | sk_set_frozen(pr->s, 1); |
96 | } |
97 | } |
f26d5c33 |
98 | return 1; |
99 | } |
100 | |
5471d09a |
101 | static void pfd_sent(Plug plug, int bufsize) |
102 | { |
103 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
104 | |
105 | sshfwd_unthrottle(pr->c, bufsize); |
106 | } |
107 | |
f26d5c33 |
108 | /* |
109 | * Called when receiving a PORT OPEN from the server |
110 | */ |
e8fa8f62 |
111 | char *pfd_newconnect(Socket *s, char *hostname, int port, void *c, |
112 | const Config *cfg) |
f26d5c33 |
113 | { |
c85623f9 |
114 | static const struct plug_function_table fn_table = { |
f26d5c33 |
115 | pfd_closing, |
116 | pfd_receive, |
5471d09a |
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 | */ |
e8fa8f62 |
128 | addr = name_lookup(hostname, port, &dummy_realhost, cfg); |
808c3834 |
129 | if ((err = sk_addr_error(addr)) != NULL) |
f26d5c33 |
130 | return err; |
131 | |
132 | /* |
133 | * Open socket. |
134 | */ |
135 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
136 | pr->fn = &fn_table; |
5471d09a |
137 | pr->throttled = pr->throttle_override = 0; |
f26d5c33 |
138 | pr->ready = 1; |
139 | pr->c = c; |
6b78788a |
140 | pr->backhandle = NULL; /* we shouldn't need this */ |
f26d5c33 |
141 | |
e8fa8f62 |
142 | pr->s = *s = new_connection(addr, dummy_realhost, port, |
143 | 0, 1, 0, (Plug) pr, cfg); |
808c3834 |
144 | if ((err = sk_socket_error(*s)) != NULL) { |
f26d5c33 |
145 | sfree(pr); |
146 | return err; |
147 | } |
148 | |
149 | sk_set_private_ptr(*s, pr); |
150 | sk_addr_free(addr); |
151 | return NULL; |
152 | } |
153 | |
154 | /* |
155 | called when someone connects to the local port |
156 | */ |
157 | |
bcce45ed |
158 | static int pfd_accepting(Plug p, void *sock) |
f26d5c33 |
159 | { |
c85623f9 |
160 | static const struct plug_function_table fn_table = { |
f26d5c33 |
161 | pfd_closing, |
162 | pfd_receive, |
5471d09a |
163 | pfd_sent, |
f26d5c33 |
164 | NULL |
165 | }; |
166 | struct PFwdPrivate *pr, *org; |
f26d5c33 |
167 | Socket s; |
168 | char *err; |
169 | |
f26d5c33 |
170 | org = (struct PFwdPrivate *)p; |
171 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
172 | pr->fn = &fn_table; |
173 | |
174 | pr->c = NULL; |
6b78788a |
175 | pr->backhandle = org->backhandle; |
f26d5c33 |
176 | |
177 | pr->s = s = sk_register(sock, (Plug) pr); |
808c3834 |
178 | if ((err = sk_socket_error(s)) != NULL) { |
f26d5c33 |
179 | sfree(pr); |
180 | return err != NULL; |
181 | } |
182 | |
6b78788a |
183 | pr->c = new_sock_channel(org->backhandle, s); |
f26d5c33 |
184 | |
185 | strcpy(pr->hostname, org->hostname); |
186 | pr->port = org->port; |
5471d09a |
187 | pr->throttled = pr->throttle_override = 0; |
f26d5c33 |
188 | pr->ready = 0; |
189 | pr->waiting = NULL; |
190 | |
191 | sk_set_private_ptr(s, pr); |
192 | |
193 | if (pr->c == NULL) { |
194 | sfree(pr); |
195 | return 1; |
196 | } else { |
197 | /* asks to forward to the specified host/port for this */ |
6b78788a |
198 | ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding"); |
f26d5c33 |
199 | } |
200 | |
201 | return 0; |
202 | } |
203 | |
204 | |
205 | /* Add a new forwarding from port -> desthost:destport |
6ee9b735 |
206 | sets up a listener on the local machine on (srcaddr:)port |
f26d5c33 |
207 | */ |
6ee9b735 |
208 | char *pfd_addforward(char *desthost, int destport, char *srcaddr, int port, |
e8fa8f62 |
209 | void *backhandle, const Config *cfg) |
f26d5c33 |
210 | { |
c85623f9 |
211 | static const struct plug_function_table fn_table = { |
f26d5c33 |
212 | pfd_closing, |
5471d09a |
213 | pfd_receive, /* should not happen... */ |
214 | pfd_sent, /* also should not happen */ |
f26d5c33 |
215 | pfd_accepting |
216 | }; |
217 | |
218 | char *err; |
219 | struct PFwdPrivate *pr; |
220 | Socket s; |
221 | |
222 | /* |
223 | * Open socket. |
224 | */ |
225 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
226 | pr->fn = &fn_table; |
227 | pr->c = NULL; |
228 | strcpy(pr->hostname, desthost); |
229 | pr->port = destport; |
5471d09a |
230 | pr->throttled = pr->throttle_override = 0; |
f26d5c33 |
231 | pr->ready = 0; |
232 | pr->waiting = NULL; |
6b78788a |
233 | pr->backhandle = backhandle; |
f26d5c33 |
234 | |
e8fa8f62 |
235 | pr->s = s = new_listener(srcaddr, port, (Plug) pr, |
236 | !cfg->lport_acceptall, cfg); |
808c3834 |
237 | if ((err = sk_socket_error(s)) != NULL) { |
f26d5c33 |
238 | sfree(pr); |
239 | return err; |
240 | } |
241 | |
242 | sk_set_private_ptr(s, pr); |
243 | |
244 | return NULL; |
245 | } |
246 | |
247 | void pfd_close(Socket s) |
248 | { |
249 | struct PFwdPrivate *pr; |
250 | |
251 | if (!s) |
252 | return; |
253 | |
254 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
255 | |
256 | sfree(pr); |
257 | |
258 | sk_close(s); |
259 | } |
260 | |
5471d09a |
261 | void pfd_unthrottle(Socket s) |
262 | { |
263 | struct PFwdPrivate *pr; |
264 | if (!s) |
265 | return; |
266 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
267 | |
268 | pr->throttled = 0; |
269 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
270 | } |
271 | |
272 | void pfd_override_throttle(Socket s, int enable) |
273 | { |
274 | struct PFwdPrivate *pr; |
275 | if (!s) |
276 | return; |
277 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
278 | |
279 | pr->throttle_override = enable; |
280 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
281 | } |
282 | |
f26d5c33 |
283 | /* |
284 | * Called to send data down the raw connection. |
285 | */ |
5471d09a |
286 | int pfd_send(Socket s, char *data, int len) |
f26d5c33 |
287 | { |
f26d5c33 |
288 | if (s == NULL) |
5471d09a |
289 | return 0; |
290 | return sk_write(s, data, len); |
f26d5c33 |
291 | } |
292 | |
293 | |
294 | void pfd_confirm(Socket s) |
295 | { |
5f2e19fc |
296 | struct PFwdPrivate *pr; |
f26d5c33 |
297 | |
298 | if (s == NULL) |
299 | return; |
300 | |
5f2e19fc |
301 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
f26d5c33 |
302 | pr->ready = 1; |
303 | sk_set_frozen(s, 0); |
304 | sk_write(s, NULL, 0); |
305 | } |