c91409da |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
b6c680d4 |
3 | #include <ctype.h> |
c91409da |
4 | |
5 | #include "putty.h" |
6 | |
7 | #ifndef FALSE |
8 | #define FALSE 0 |
9 | #endif |
10 | #ifndef TRUE |
11 | #define TRUE 1 |
12 | #endif |
13 | |
5471d09a |
14 | #define RLOGIN_MAX_BACKLOG 4096 |
15 | |
51470298 |
16 | typedef struct rlogin_tag { |
17 | const struct plug_function_table *fn; |
18 | /* the above field _must_ be first in the structure */ |
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19 | |
51470298 |
20 | Socket s; |
21 | int bufsize; |
c85623f9 |
22 | int firstbyte; |
51470298 |
23 | int term_width, term_height; |
24 | void *frontend; |
25 | } *Rlogin; |
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26 | |
51470298 |
27 | static void rlogin_size(void *handle, int width, int height); |
28 | |
29 | static void c_write(Rlogin rlogin, char *buf, int len) |
32874aea |
30 | { |
51470298 |
31 | int backlog = from_backend(rlogin->frontend, 0, buf, len); |
32 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
c91409da |
33 | } |
34 | |
7555d6a5 |
35 | static void rlogin_log(Plug plug, int type, SockAddr addr, int port, |
36 | const char *error_msg, int error_code) |
37 | { |
38 | Rlogin rlogin = (Rlogin) plug; |
39 | char addrbuf[256], *msg; |
40 | |
41 | sk_getaddr(addr, addrbuf, lenof(addrbuf)); |
42 | |
43 | if (type == 0) |
44 | msg = dupprintf("Connecting to %s port %d", addrbuf, port); |
45 | else |
46 | msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); |
47 | |
48 | logevent(rlogin->frontend, msg); |
49 | } |
50 | |
cbe2d68f |
51 | static int rlogin_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
52 | int calling_back) |
53 | { |
51470298 |
54 | Rlogin rlogin = (Rlogin) plug; |
55 | if (rlogin->s) { |
56 | sk_close(rlogin->s); |
57 | rlogin->s = NULL; |
39934deb |
58 | notify_remote_exit(rlogin->frontend); |
f3ab576e |
59 | } |
7e78000d |
60 | if (error_msg) { |
32874aea |
61 | /* A socket error has occurred. */ |
a8327734 |
62 | logevent(rlogin->frontend, error_msg); |
971bcc0a |
63 | connection_fatal(rlogin->frontend, "%s", error_msg); |
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64 | } /* Otherwise, the remote side closed the connection normally. */ |
7e78000d |
65 | return 0; |
66 | } |
67 | |
32874aea |
68 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
69 | { |
51470298 |
70 | Rlogin rlogin = (Rlogin) plug; |
c91409da |
71 | if (urgent == 2) { |
32874aea |
72 | char c; |
73 | |
74 | c = *data++; |
75 | len--; |
76 | if (c == '\x80') |
51470298 |
77 | rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); |
32874aea |
78 | /* |
79 | * We should flush everything (aka Telnet SYNCH) if we see |
80 | * 0x02, and we should turn off and on _local_ flow control |
81 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
82 | * worth it... |
83 | */ |
8a5fb9e3 |
84 | } else { |
32874aea |
85 | /* |
86 | * Main rlogin protocol. This is really simple: the first |
87 | * byte is expected to be NULL and is ignored, and the rest |
88 | * is printed. |
89 | */ |
c85623f9 |
90 | if (rlogin->firstbyte) { |
32874aea |
91 | if (data[0] == '\0') { |
92 | data++; |
93 | len--; |
94 | } |
c85623f9 |
95 | rlogin->firstbyte = 0; |
32874aea |
96 | } |
2b0c045b |
97 | if (len > 0) |
51470298 |
98 | c_write(rlogin, data, len); |
c91409da |
99 | } |
c91409da |
100 | return 1; |
101 | } |
102 | |
3ad9d396 |
103 | static void rlogin_sent(Plug plug, int bufsize) |
104 | { |
51470298 |
105 | Rlogin rlogin = (Rlogin) plug; |
106 | rlogin->bufsize = bufsize; |
3ad9d396 |
107 | } |
108 | |
c91409da |
109 | /* |
110 | * Called to set up the rlogin connection. |
111 | * |
112 | * Returns an error message, or NULL on success. |
113 | * |
6e1ebb76 |
114 | * Also places the canonical host name into `realhost'. It must be |
115 | * freed by the caller. |
c91409da |
116 | */ |
cbe2d68f |
117 | static const char *rlogin_init(void *frontend_handle, void **backend_handle, |
118 | Config *cfg, |
119 | char *host, int port, char **realhost, |
79bf227b |
120 | int nodelay, int keepalive) |
32874aea |
121 | { |
51470298 |
122 | static const struct plug_function_table fn_table = { |
7555d6a5 |
123 | rlogin_log, |
7e78000d |
124 | rlogin_closing, |
3ad9d396 |
125 | rlogin_receive, |
126 | rlogin_sent |
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127 | }; |
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128 | SockAddr addr; |
cbe2d68f |
129 | const char *err; |
51470298 |
130 | Rlogin rlogin; |
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131 | |
3d88e64d |
132 | rlogin = snew(struct rlogin_tag); |
51470298 |
133 | rlogin->fn = &fn_table; |
134 | rlogin->s = NULL; |
135 | rlogin->frontend = frontend_handle; |
86916870 |
136 | rlogin->term_width = cfg->width; |
137 | rlogin->term_height = cfg->height; |
c85623f9 |
138 | rlogin->firstbyte = 1; |
51470298 |
139 | *backend_handle = rlogin; |
887035a5 |
140 | |
c91409da |
141 | /* |
142 | * Try to find host. |
143 | */ |
3ad9d396 |
144 | { |
57356d63 |
145 | char *buf; |
05581745 |
146 | buf = dupprintf("Looking up host \"%s\"%s", host, |
147 | (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : |
148 | (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : |
149 | ""))); |
a8327734 |
150 | logevent(rlogin->frontend, buf); |
57356d63 |
151 | sfree(buf); |
3ad9d396 |
152 | } |
05581745 |
153 | addr = name_lookup(host, port, realhost, cfg, cfg->addressfamily); |
f85e6f6e |
154 | if ((err = sk_addr_error(addr)) != NULL) { |
155 | sk_addr_free(addr); |
c91409da |
156 | return err; |
f85e6f6e |
157 | } |
c91409da |
158 | |
159 | if (port < 0) |
160 | port = 513; /* default rlogin port */ |
161 | |
162 | /* |
163 | * Open socket. |
164 | */ |
51470298 |
165 | rlogin->s = new_connection(addr, *realhost, port, 1, 0, |
79bf227b |
166 | nodelay, keepalive, (Plug) rlogin, cfg); |
6f1e7b78 |
167 | if ((err = sk_socket_error(rlogin->s)) != NULL) |
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168 | return err; |
169 | |
c91409da |
170 | /* |
171 | * Send local username, remote username, terminal/speed |
172 | */ |
173 | |
174 | { |
32874aea |
175 | char z = 0; |
176 | char *p; |
51470298 |
177 | sk_write(rlogin->s, &z, 1); |
86916870 |
178 | sk_write(rlogin->s, cfg->localusername, |
179 | strlen(cfg->localusername)); |
51470298 |
180 | sk_write(rlogin->s, &z, 1); |
86916870 |
181 | sk_write(rlogin->s, cfg->username, |
182 | strlen(cfg->username)); |
51470298 |
183 | sk_write(rlogin->s, &z, 1); |
86916870 |
184 | sk_write(rlogin->s, cfg->termtype, |
185 | strlen(cfg->termtype)); |
51470298 |
186 | sk_write(rlogin->s, "/", 1); |
e93ed432 |
187 | for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue; |
86916870 |
188 | sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed); |
51470298 |
189 | rlogin->bufsize = sk_write(rlogin->s, &z, 1); |
c91409da |
190 | } |
191 | |
c91409da |
192 | return NULL; |
193 | } |
194 | |
fabd1805 |
195 | static void rlogin_free(void *handle) |
196 | { |
197 | Rlogin rlogin = (Rlogin) handle; |
198 | |
199 | if (rlogin->s) |
200 | sk_close(rlogin->s); |
201 | sfree(rlogin); |
202 | } |
203 | |
c91409da |
204 | /* |
86916870 |
205 | * Stub routine (we don't have any need to reconfigure this backend). |
206 | */ |
207 | static void rlogin_reconfig(void *handle, Config *cfg) |
208 | { |
209 | } |
210 | |
211 | /* |
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212 | * Called to send data down the rlogin connection. |
213 | */ |
51470298 |
214 | static int rlogin_send(void *handle, char *buf, int len) |
32874aea |
215 | { |
51470298 |
216 | Rlogin rlogin = (Rlogin) handle; |
217 | |
218 | if (rlogin->s == NULL) |
b5a460cd |
219 | return 0; |
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220 | |
51470298 |
221 | rlogin->bufsize = sk_write(rlogin->s, buf, len); |
5471d09a |
222 | |
51470298 |
223 | return rlogin->bufsize; |
5471d09a |
224 | } |
225 | |
226 | /* |
227 | * Called to query the current socket sendability status. |
228 | */ |
51470298 |
229 | static int rlogin_sendbuffer(void *handle) |
5471d09a |
230 | { |
51470298 |
231 | Rlogin rlogin = (Rlogin) handle; |
232 | return rlogin->bufsize; |
c91409da |
233 | } |
234 | |
235 | /* |
236 | * Called to set the size of the window |
237 | */ |
51470298 |
238 | static void rlogin_size(void *handle, int width, int height) |
32874aea |
239 | { |
51470298 |
240 | Rlogin rlogin = (Rlogin) handle; |
e418595a |
241 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
c91409da |
242 | |
51470298 |
243 | rlogin->term_width = width; |
244 | rlogin->term_height = height; |
f278d6f8 |
245 | |
51470298 |
246 | if (rlogin->s == NULL) |
cf293dd4 |
247 | return; |
f278d6f8 |
248 | |
51470298 |
249 | b[6] = rlogin->term_width >> 8; |
250 | b[7] = rlogin->term_width & 0xFF; |
251 | b[4] = rlogin->term_height >> 8; |
252 | b[5] = rlogin->term_height & 0xFF; |
253 | rlogin->bufsize = sk_write(rlogin->s, b, 12); |
c91409da |
254 | return; |
255 | } |
256 | |
257 | /* |
258 | * Send rlogin special codes. |
259 | */ |
51470298 |
260 | static void rlogin_special(void *handle, Telnet_Special code) |
32874aea |
261 | { |
c91409da |
262 | /* Do nothing! */ |
263 | return; |
264 | } |
265 | |
125105d1 |
266 | /* |
267 | * Return a list of the special codes that make sense in this |
268 | * protocol. |
269 | */ |
270 | static const struct telnet_special *rlogin_get_specials(void *handle) |
271 | { |
272 | return NULL; |
273 | } |
274 | |
51470298 |
275 | static Socket rlogin_socket(void *handle) |
32874aea |
276 | { |
51470298 |
277 | Rlogin rlogin = (Rlogin) handle; |
278 | return rlogin->s; |
32874aea |
279 | } |
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280 | |
51470298 |
281 | static int rlogin_sendok(void *handle) |
32874aea |
282 | { |
68a49acb |
283 | /* Rlogin rlogin = (Rlogin) handle; */ |
32874aea |
284 | return 1; |
285 | } |
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286 | |
51470298 |
287 | static void rlogin_unthrottle(void *handle, int backlog) |
5471d09a |
288 | { |
51470298 |
289 | Rlogin rlogin = (Rlogin) handle; |
290 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
5471d09a |
291 | } |
292 | |
51470298 |
293 | static int rlogin_ldisc(void *handle, int option) |
32874aea |
294 | { |
68a49acb |
295 | /* Rlogin rlogin = (Rlogin) handle; */ |
0965bee0 |
296 | return 0; |
297 | } |
298 | |
b9d7bcad |
299 | static void rlogin_provide_ldisc(void *handle, void *ldisc) |
300 | { |
301 | /* This is a stub. */ |
302 | } |
303 | |
a8327734 |
304 | static void rlogin_provide_logctx(void *handle, void *logctx) |
305 | { |
306 | /* This is a stub. */ |
307 | } |
308 | |
51470298 |
309 | static int rlogin_exitcode(void *handle) |
d8d6c7e5 |
310 | { |
0da1a790 |
311 | Rlogin rlogin = (Rlogin) handle; |
312 | if (rlogin->s != NULL) |
313 | return -1; /* still connected */ |
314 | else |
315 | /* If we ever implement RSH, we'll probably need to do this properly */ |
316 | return 0; |
d8d6c7e5 |
317 | } |
318 | |
f89c3294 |
319 | /* |
320 | * cfg_info for rlogin does nothing at all. |
321 | */ |
322 | static int rlogin_cfg_info(void *handle) |
323 | { |
324 | return 0; |
325 | } |
326 | |
c91409da |
327 | Backend rlogin_backend = { |
328 | rlogin_init, |
fabd1805 |
329 | rlogin_free, |
86916870 |
330 | rlogin_reconfig, |
c91409da |
331 | rlogin_send, |
5471d09a |
332 | rlogin_sendbuffer, |
c91409da |
333 | rlogin_size, |
334 | rlogin_special, |
125105d1 |
335 | rlogin_get_specials, |
c91409da |
336 | rlogin_socket, |
d8d6c7e5 |
337 | rlogin_exitcode, |
c91409da |
338 | rlogin_sendok, |
0965bee0 |
339 | rlogin_ldisc, |
b9d7bcad |
340 | rlogin_provide_ldisc, |
a8327734 |
341 | rlogin_provide_logctx, |
5471d09a |
342 | rlogin_unthrottle, |
f89c3294 |
343 | rlogin_cfg_info, |
c91409da |
344 | 1 |
345 | }; |