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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 | |
156 | static int pfd_accepting(Plug p, struct sockaddr *addr, void *sock) |
157 | { |
158 | /* for now always accept this socket */ |
159 | static struct plug_function_table fn_table = { |
160 | pfd_closing, |
161 | pfd_receive, |
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162 | pfd_sent, |
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163 | NULL |
164 | }; |
165 | struct PFwdPrivate *pr, *org; |
166 | struct sockaddr_in *sin = (struct sockaddr_in *)addr; |
167 | Socket s; |
168 | char *err; |
169 | |
170 | if (ntohl(sin->sin_addr.s_addr) != 0x7F000001 && !cfg.lport_acceptall) |
171 | return 1; /* denied */ |
172 | |
173 | org = (struct PFwdPrivate *)p; |
174 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
175 | pr->fn = &fn_table; |
176 | |
177 | pr->c = NULL; |
178 | |
179 | pr->s = s = sk_register(sock, (Plug) pr); |
180 | if ((err = sk_socket_error(s))) { |
181 | sfree(pr); |
182 | return err != NULL; |
183 | } |
184 | |
185 | pr->c = new_sock_channel(s); |
186 | |
187 | strcpy(pr->hostname, org->hostname); |
188 | pr->port = org->port; |
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189 | pr->throttled = pr->throttle_override = 0; |
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190 | pr->ready = 0; |
191 | pr->waiting = NULL; |
192 | |
193 | sk_set_private_ptr(s, pr); |
194 | |
195 | if (pr->c == NULL) { |
196 | sfree(pr); |
197 | return 1; |
198 | } else { |
199 | /* asks to forward to the specified host/port for this */ |
200 | ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding"); |
201 | } |
202 | |
203 | return 0; |
204 | } |
205 | |
206 | |
207 | /* Add a new forwarding from port -> desthost:destport |
208 | sets up a listenner on the local machine on port |
209 | */ |
210 | char *pfd_addforward(char *desthost, int destport, int port) |
211 | { |
212 | static struct plug_function_table fn_table = { |
213 | pfd_closing, |
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214 | pfd_receive, /* should not happen... */ |
215 | pfd_sent, /* also should not happen */ |
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216 | pfd_accepting |
217 | }; |
218 | |
219 | char *err; |
220 | struct PFwdPrivate *pr; |
221 | Socket s; |
222 | |
223 | /* |
224 | * Open socket. |
225 | */ |
226 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
227 | pr->fn = &fn_table; |
228 | pr->c = NULL; |
229 | strcpy(pr->hostname, desthost); |
230 | pr->port = destport; |
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231 | pr->throttled = pr->throttle_override = 0; |
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232 | pr->ready = 0; |
233 | pr->waiting = NULL; |
234 | |
235 | pr->s = s = sk_newlistenner(port, (Plug) pr); |
236 | if ((err = sk_socket_error(s))) { |
237 | sfree(pr); |
238 | return err; |
239 | } |
240 | |
241 | sk_set_private_ptr(s, pr); |
242 | |
243 | return NULL; |
244 | } |
245 | |
246 | void pfd_close(Socket s) |
247 | { |
248 | struct PFwdPrivate *pr; |
249 | |
250 | if (!s) |
251 | return; |
252 | |
253 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
254 | |
255 | sfree(pr); |
256 | |
257 | sk_close(s); |
258 | } |
259 | |
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260 | void pfd_unthrottle(Socket s) |
261 | { |
262 | struct PFwdPrivate *pr; |
263 | if (!s) |
264 | return; |
265 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
266 | |
267 | pr->throttled = 0; |
268 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
269 | } |
270 | |
271 | void pfd_override_throttle(Socket s, int enable) |
272 | { |
273 | struct PFwdPrivate *pr; |
274 | if (!s) |
275 | return; |
276 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
277 | |
278 | pr->throttle_override = enable; |
279 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
280 | } |
281 | |
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282 | /* |
283 | * Called to send data down the raw connection. |
284 | */ |
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285 | int pfd_send(Socket s, char *data, int len) |
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286 | { |
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287 | if (s == NULL) |
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288 | return 0; |
289 | return sk_write(s, data, len); |
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290 | } |
291 | |
292 | |
293 | void pfd_confirm(Socket s) |
294 | { |
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295 | struct PFwdPrivate *pr; |
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296 | |
297 | if (s == NULL) |
298 | return; |
299 | |
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300 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
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301 | pr->ready = 1; |
302 | sk_set_frozen(s, 0); |
303 | sk_write(s, NULL, 0); |
304 | } |