eaf1e20a |
1 | /* |
2 | * Rlogin backend. |
3 | */ |
4 | |
c91409da |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
96b720b3 |
7 | #include <limits.h> |
b6c680d4 |
8 | #include <ctype.h> |
c91409da |
9 | |
10 | #include "putty.h" |
11 | |
12 | #ifndef FALSE |
13 | #define FALSE 0 |
14 | #endif |
15 | #ifndef TRUE |
16 | #define TRUE 1 |
17 | #endif |
18 | |
5471d09a |
19 | #define RLOGIN_MAX_BACKLOG 4096 |
20 | |
51470298 |
21 | typedef struct rlogin_tag { |
22 | const struct plug_function_table *fn; |
23 | /* the above field _must_ be first in the structure */ |
c91409da |
24 | |
51470298 |
25 | Socket s; |
96b720b3 |
26 | int closed_on_socket_error; |
51470298 |
27 | int bufsize; |
c85623f9 |
28 | int firstbyte; |
2c42b725 |
29 | int cansize; |
51470298 |
30 | int term_width, term_height; |
31 | void *frontend; |
2d8d01c8 |
32 | |
4a693cfc |
33 | Conf *conf; |
2d8d01c8 |
34 | |
35 | /* In case we need to read a username from the terminal before starting */ |
36 | prompts_t *prompt; |
51470298 |
37 | } *Rlogin; |
c91409da |
38 | |
51470298 |
39 | static void rlogin_size(void *handle, int width, int height); |
40 | |
41 | static void c_write(Rlogin rlogin, char *buf, int len) |
32874aea |
42 | { |
51470298 |
43 | int backlog = from_backend(rlogin->frontend, 0, buf, len); |
44 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
c91409da |
45 | } |
46 | |
7555d6a5 |
47 | static void rlogin_log(Plug plug, int type, SockAddr addr, int port, |
48 | const char *error_msg, int error_code) |
49 | { |
50 | Rlogin rlogin = (Rlogin) plug; |
51 | char addrbuf[256], *msg; |
52 | |
53 | sk_getaddr(addr, addrbuf, lenof(addrbuf)); |
54 | |
55 | if (type == 0) |
56 | msg = dupprintf("Connecting to %s port %d", addrbuf, port); |
57 | else |
58 | msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); |
59 | |
60 | logevent(rlogin->frontend, msg); |
61 | } |
62 | |
cbe2d68f |
63 | static int rlogin_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
64 | int calling_back) |
65 | { |
51470298 |
66 | Rlogin rlogin = (Rlogin) plug; |
bc06669b |
67 | |
68 | /* |
69 | * We don't implement independent EOF in each direction for Telnet |
70 | * connections; as soon as we get word that the remote side has |
71 | * sent us EOF, we wind up the whole connection. |
72 | */ |
73 | |
51470298 |
74 | if (rlogin->s) { |
75 | sk_close(rlogin->s); |
76 | rlogin->s = NULL; |
96b720b3 |
77 | if (error_msg) |
78 | rlogin->closed_on_socket_error = TRUE; |
39934deb |
79 | notify_remote_exit(rlogin->frontend); |
f3ab576e |
80 | } |
7e78000d |
81 | if (error_msg) { |
32874aea |
82 | /* A socket error has occurred. */ |
a8327734 |
83 | logevent(rlogin->frontend, error_msg); |
971bcc0a |
84 | connection_fatal(rlogin->frontend, "%s", error_msg); |
32874aea |
85 | } /* Otherwise, the remote side closed the connection normally. */ |
7e78000d |
86 | return 0; |
87 | } |
88 | |
32874aea |
89 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
90 | { |
51470298 |
91 | Rlogin rlogin = (Rlogin) plug; |
c91409da |
92 | if (urgent == 2) { |
32874aea |
93 | char c; |
94 | |
95 | c = *data++; |
96 | len--; |
2c42b725 |
97 | if (c == '\x80') { |
98 | rlogin->cansize = 1; |
51470298 |
99 | rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); |
2c42b725 |
100 | } |
32874aea |
101 | /* |
102 | * We should flush everything (aka Telnet SYNCH) if we see |
103 | * 0x02, and we should turn off and on _local_ flow control |
104 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
105 | * worth it... |
106 | */ |
8a5fb9e3 |
107 | } else { |
32874aea |
108 | /* |
109 | * Main rlogin protocol. This is really simple: the first |
110 | * byte is expected to be NULL and is ignored, and the rest |
111 | * is printed. |
112 | */ |
c85623f9 |
113 | if (rlogin->firstbyte) { |
32874aea |
114 | if (data[0] == '\0') { |
115 | data++; |
116 | len--; |
117 | } |
c85623f9 |
118 | rlogin->firstbyte = 0; |
32874aea |
119 | } |
2b0c045b |
120 | if (len > 0) |
51470298 |
121 | c_write(rlogin, data, len); |
c91409da |
122 | } |
c91409da |
123 | return 1; |
124 | } |
125 | |
3ad9d396 |
126 | static void rlogin_sent(Plug plug, int bufsize) |
127 | { |
51470298 |
128 | Rlogin rlogin = (Rlogin) plug; |
129 | rlogin->bufsize = bufsize; |
3ad9d396 |
130 | } |
131 | |
2d8d01c8 |
132 | static void rlogin_startup(Rlogin rlogin, const char *ruser) |
133 | { |
134 | char z = 0; |
135 | char *p; |
4a693cfc |
136 | |
2d8d01c8 |
137 | sk_write(rlogin->s, &z, 1); |
4a693cfc |
138 | p = conf_get_str(rlogin->conf, CONF_localusername); |
139 | sk_write(rlogin->s, p, strlen(p)); |
2d8d01c8 |
140 | sk_write(rlogin->s, &z, 1); |
4a693cfc |
141 | sk_write(rlogin->s, ruser, strlen(ruser)); |
2d8d01c8 |
142 | sk_write(rlogin->s, &z, 1); |
4a693cfc |
143 | p = conf_get_str(rlogin->conf, CONF_termtype); |
144 | sk_write(rlogin->s, p, strlen(p)); |
2d8d01c8 |
145 | sk_write(rlogin->s, "/", 1); |
4a693cfc |
146 | p = conf_get_str(rlogin->conf, CONF_termspeed); |
147 | sk_write(rlogin->s, p, strspn(p, "0123456789")); |
2d8d01c8 |
148 | rlogin->bufsize = sk_write(rlogin->s, &z, 1); |
149 | |
150 | rlogin->prompt = NULL; |
151 | } |
152 | |
c91409da |
153 | /* |
154 | * Called to set up the rlogin connection. |
155 | * |
156 | * Returns an error message, or NULL on success. |
157 | * |
6e1ebb76 |
158 | * Also places the canonical host name into `realhost'. It must be |
159 | * freed by the caller. |
c91409da |
160 | */ |
cbe2d68f |
161 | static const char *rlogin_init(void *frontend_handle, void **backend_handle, |
4a693cfc |
162 | Conf *conf, |
cbe2d68f |
163 | char *host, int port, char **realhost, |
79bf227b |
164 | int nodelay, int keepalive) |
32874aea |
165 | { |
51470298 |
166 | static const struct plug_function_table fn_table = { |
7555d6a5 |
167 | rlogin_log, |
7e78000d |
168 | rlogin_closing, |
3ad9d396 |
169 | rlogin_receive, |
170 | rlogin_sent |
51470298 |
171 | }; |
c91409da |
172 | SockAddr addr; |
cbe2d68f |
173 | const char *err; |
51470298 |
174 | Rlogin rlogin; |
4a693cfc |
175 | char *ruser; |
176 | int addressfamily; |
177 | char *loghost; |
c91409da |
178 | |
3d88e64d |
179 | rlogin = snew(struct rlogin_tag); |
51470298 |
180 | rlogin->fn = &fn_table; |
181 | rlogin->s = NULL; |
96b720b3 |
182 | rlogin->closed_on_socket_error = FALSE; |
51470298 |
183 | rlogin->frontend = frontend_handle; |
4a693cfc |
184 | rlogin->term_width = conf_get_int(conf, CONF_width); |
185 | rlogin->term_height = conf_get_int(conf, CONF_height); |
c85623f9 |
186 | rlogin->firstbyte = 1; |
2c42b725 |
187 | rlogin->cansize = 0; |
2d8d01c8 |
188 | rlogin->prompt = NULL; |
4a693cfc |
189 | rlogin->conf = conf_copy(conf); |
51470298 |
190 | *backend_handle = rlogin; |
887035a5 |
191 | |
4a693cfc |
192 | addressfamily = conf_get_int(conf, CONF_addressfamily); |
c91409da |
193 | /* |
194 | * Try to find host. |
195 | */ |
3ad9d396 |
196 | { |
57356d63 |
197 | char *buf; |
05581745 |
198 | buf = dupprintf("Looking up host \"%s\"%s", host, |
4a693cfc |
199 | (addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : |
200 | (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : |
05581745 |
201 | ""))); |
a8327734 |
202 | logevent(rlogin->frontend, buf); |
57356d63 |
203 | sfree(buf); |
3ad9d396 |
204 | } |
4a693cfc |
205 | addr = name_lookup(host, port, realhost, conf, addressfamily); |
f85e6f6e |
206 | if ((err = sk_addr_error(addr)) != NULL) { |
207 | sk_addr_free(addr); |
c91409da |
208 | return err; |
f85e6f6e |
209 | } |
c91409da |
210 | |
211 | if (port < 0) |
212 | port = 513; /* default rlogin port */ |
213 | |
214 | /* |
215 | * Open socket. |
216 | */ |
51470298 |
217 | rlogin->s = new_connection(addr, *realhost, port, 1, 0, |
4a693cfc |
218 | nodelay, keepalive, (Plug) rlogin, conf); |
6f1e7b78 |
219 | if ((err = sk_socket_error(rlogin->s)) != NULL) |
c91409da |
220 | return err; |
221 | |
4a693cfc |
222 | loghost = conf_get_str(conf, CONF_loghost); |
223 | if (*loghost) { |
881da168 |
224 | char *colon; |
225 | |
226 | sfree(*realhost); |
4a693cfc |
227 | *realhost = dupstr(loghost); |
881da168 |
228 | colon = strrchr(*realhost, ':'); |
229 | if (colon) { |
230 | /* |
231 | * FIXME: if we ever update this aspect of ssh.c for |
232 | * IPv6 literal management, this should change in line |
233 | * with it. |
234 | */ |
235 | *colon++ = '\0'; |
236 | } |
237 | } |
238 | |
2d8d01c8 |
239 | /* |
240 | * Send local username, remote username, terminal type and |
241 | * terminal speed - unless we don't have the remote username yet, |
242 | * in which case we prompt for it and may end up deferring doing |
243 | * anything else until the local prompt mechanism returns. |
244 | */ |
fb7f9d79 |
245 | if ((ruser = get_remote_username(conf)) != NULL) { |
2d8d01c8 |
246 | rlogin_startup(rlogin, ruser); |
4a693cfc |
247 | sfree(ruser); |
2d8d01c8 |
248 | } else { |
249 | int ret; |
250 | |
251 | rlogin->prompt = new_prompts(rlogin->frontend); |
252 | rlogin->prompt->to_server = TRUE; |
253 | rlogin->prompt->name = dupstr("Rlogin login name"); |
b61f81bc |
254 | add_prompt(rlogin->prompt, dupstr("rlogin username: "), TRUE); |
2d8d01c8 |
255 | ret = get_userpass_input(rlogin->prompt, NULL, 0); |
256 | if (ret >= 0) { |
257 | rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result); |
258 | } |
259 | } |
260 | |
c91409da |
261 | return NULL; |
262 | } |
263 | |
fabd1805 |
264 | static void rlogin_free(void *handle) |
265 | { |
266 | Rlogin rlogin = (Rlogin) handle; |
267 | |
2d8d01c8 |
268 | if (rlogin->prompt) |
269 | free_prompts(rlogin->prompt); |
fabd1805 |
270 | if (rlogin->s) |
271 | sk_close(rlogin->s); |
4a693cfc |
272 | conf_free(rlogin->conf); |
fabd1805 |
273 | sfree(rlogin); |
274 | } |
275 | |
c91409da |
276 | /* |
86916870 |
277 | * Stub routine (we don't have any need to reconfigure this backend). |
278 | */ |
4a693cfc |
279 | static void rlogin_reconfig(void *handle, Conf *conf) |
86916870 |
280 | { |
281 | } |
282 | |
283 | /* |
c91409da |
284 | * Called to send data down the rlogin connection. |
285 | */ |
51470298 |
286 | static int rlogin_send(void *handle, char *buf, int len) |
32874aea |
287 | { |
51470298 |
288 | Rlogin rlogin = (Rlogin) handle; |
289 | |
290 | if (rlogin->s == NULL) |
b5a460cd |
291 | return 0; |
c91409da |
292 | |
2d8d01c8 |
293 | if (rlogin->prompt) { |
294 | /* |
295 | * We're still prompting for a username, and aren't talking |
296 | * directly to the network connection yet. |
297 | */ |
298 | int ret = get_userpass_input(rlogin->prompt, |
299 | (unsigned char *)buf, len); |
300 | if (ret >= 0) { |
301 | rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result); |
302 | /* that nulls out rlogin->prompt, so then we'll start sending |
303 | * data down the wire in the obvious way */ |
304 | } |
305 | } else { |
306 | rlogin->bufsize = sk_write(rlogin->s, buf, len); |
307 | } |
5471d09a |
308 | |
51470298 |
309 | return rlogin->bufsize; |
5471d09a |
310 | } |
311 | |
312 | /* |
313 | * Called to query the current socket sendability status. |
314 | */ |
51470298 |
315 | static int rlogin_sendbuffer(void *handle) |
5471d09a |
316 | { |
51470298 |
317 | Rlogin rlogin = (Rlogin) handle; |
318 | return rlogin->bufsize; |
c91409da |
319 | } |
320 | |
321 | /* |
322 | * Called to set the size of the window |
323 | */ |
51470298 |
324 | static void rlogin_size(void *handle, int width, int height) |
32874aea |
325 | { |
51470298 |
326 | Rlogin rlogin = (Rlogin) handle; |
e418595a |
327 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
c91409da |
328 | |
51470298 |
329 | rlogin->term_width = width; |
330 | rlogin->term_height = height; |
f278d6f8 |
331 | |
2c42b725 |
332 | if (rlogin->s == NULL || !rlogin->cansize) |
cf293dd4 |
333 | return; |
f278d6f8 |
334 | |
51470298 |
335 | b[6] = rlogin->term_width >> 8; |
336 | b[7] = rlogin->term_width & 0xFF; |
337 | b[4] = rlogin->term_height >> 8; |
338 | b[5] = rlogin->term_height & 0xFF; |
339 | rlogin->bufsize = sk_write(rlogin->s, b, 12); |
c91409da |
340 | return; |
341 | } |
342 | |
343 | /* |
344 | * Send rlogin special codes. |
345 | */ |
51470298 |
346 | static void rlogin_special(void *handle, Telnet_Special code) |
32874aea |
347 | { |
c91409da |
348 | /* Do nothing! */ |
349 | return; |
350 | } |
351 | |
125105d1 |
352 | /* |
353 | * Return a list of the special codes that make sense in this |
354 | * protocol. |
355 | */ |
356 | static const struct telnet_special *rlogin_get_specials(void *handle) |
357 | { |
358 | return NULL; |
359 | } |
360 | |
6226c939 |
361 | static int rlogin_connected(void *handle) |
32874aea |
362 | { |
51470298 |
363 | Rlogin rlogin = (Rlogin) handle; |
6226c939 |
364 | return rlogin->s != NULL; |
32874aea |
365 | } |
c91409da |
366 | |
51470298 |
367 | static int rlogin_sendok(void *handle) |
32874aea |
368 | { |
68a49acb |
369 | /* Rlogin rlogin = (Rlogin) handle; */ |
32874aea |
370 | return 1; |
371 | } |
c91409da |
372 | |
51470298 |
373 | static void rlogin_unthrottle(void *handle, int backlog) |
5471d09a |
374 | { |
51470298 |
375 | Rlogin rlogin = (Rlogin) handle; |
376 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
5471d09a |
377 | } |
378 | |
51470298 |
379 | static int rlogin_ldisc(void *handle, int option) |
32874aea |
380 | { |
68a49acb |
381 | /* Rlogin rlogin = (Rlogin) handle; */ |
0965bee0 |
382 | return 0; |
383 | } |
384 | |
b9d7bcad |
385 | static void rlogin_provide_ldisc(void *handle, void *ldisc) |
386 | { |
387 | /* This is a stub. */ |
388 | } |
389 | |
a8327734 |
390 | static void rlogin_provide_logctx(void *handle, void *logctx) |
391 | { |
392 | /* This is a stub. */ |
393 | } |
394 | |
51470298 |
395 | static int rlogin_exitcode(void *handle) |
d8d6c7e5 |
396 | { |
0da1a790 |
397 | Rlogin rlogin = (Rlogin) handle; |
398 | if (rlogin->s != NULL) |
399 | return -1; /* still connected */ |
96b720b3 |
400 | else if (rlogin->closed_on_socket_error) |
401 | return INT_MAX; /* a socket error counts as an unclean exit */ |
0da1a790 |
402 | else |
403 | /* If we ever implement RSH, we'll probably need to do this properly */ |
404 | return 0; |
d8d6c7e5 |
405 | } |
406 | |
f89c3294 |
407 | /* |
408 | * cfg_info for rlogin does nothing at all. |
409 | */ |
410 | static int rlogin_cfg_info(void *handle) |
411 | { |
412 | return 0; |
413 | } |
414 | |
c91409da |
415 | Backend rlogin_backend = { |
416 | rlogin_init, |
fabd1805 |
417 | rlogin_free, |
86916870 |
418 | rlogin_reconfig, |
c91409da |
419 | rlogin_send, |
5471d09a |
420 | rlogin_sendbuffer, |
c91409da |
421 | rlogin_size, |
422 | rlogin_special, |
125105d1 |
423 | rlogin_get_specials, |
6226c939 |
424 | rlogin_connected, |
d8d6c7e5 |
425 | rlogin_exitcode, |
c91409da |
426 | rlogin_sendok, |
0965bee0 |
427 | rlogin_ldisc, |
b9d7bcad |
428 | rlogin_provide_ldisc, |
a8327734 |
429 | rlogin_provide_logctx, |
5471d09a |
430 | rlogin_unthrottle, |
f89c3294 |
431 | rlogin_cfg_info, |
9e164d82 |
432 | "rlogin", |
433 | PROT_RLOGIN, |
a4451dd1 |
434 | 513 |
c91409da |
435 | }; |