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 | |
cbe2d68f |
35 | static int rlogin_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
36 | int calling_back) |
37 | { |
51470298 |
38 | Rlogin rlogin = (Rlogin) plug; |
39 | if (rlogin->s) { |
40 | sk_close(rlogin->s); |
41 | rlogin->s = NULL; |
39934deb |
42 | notify_remote_exit(rlogin->frontend); |
f3ab576e |
43 | } |
7e78000d |
44 | if (error_msg) { |
32874aea |
45 | /* A socket error has occurred. */ |
a8327734 |
46 | logevent(rlogin->frontend, error_msg); |
971bcc0a |
47 | connection_fatal(rlogin->frontend, "%s", error_msg); |
32874aea |
48 | } /* Otherwise, the remote side closed the connection normally. */ |
7e78000d |
49 | return 0; |
50 | } |
51 | |
32874aea |
52 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
53 | { |
51470298 |
54 | Rlogin rlogin = (Rlogin) plug; |
c91409da |
55 | if (urgent == 2) { |
32874aea |
56 | char c; |
57 | |
58 | c = *data++; |
59 | len--; |
60 | if (c == '\x80') |
51470298 |
61 | rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); |
32874aea |
62 | /* |
63 | * We should flush everything (aka Telnet SYNCH) if we see |
64 | * 0x02, and we should turn off and on _local_ flow control |
65 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
66 | * worth it... |
67 | */ |
8a5fb9e3 |
68 | } else { |
32874aea |
69 | /* |
70 | * Main rlogin protocol. This is really simple: the first |
71 | * byte is expected to be NULL and is ignored, and the rest |
72 | * is printed. |
73 | */ |
c85623f9 |
74 | if (rlogin->firstbyte) { |
32874aea |
75 | if (data[0] == '\0') { |
76 | data++; |
77 | len--; |
78 | } |
c85623f9 |
79 | rlogin->firstbyte = 0; |
32874aea |
80 | } |
2b0c045b |
81 | if (len > 0) |
51470298 |
82 | c_write(rlogin, data, len); |
c91409da |
83 | } |
c91409da |
84 | return 1; |
85 | } |
86 | |
3ad9d396 |
87 | static void rlogin_sent(Plug plug, int bufsize) |
88 | { |
51470298 |
89 | Rlogin rlogin = (Rlogin) plug; |
90 | rlogin->bufsize = bufsize; |
3ad9d396 |
91 | } |
92 | |
c91409da |
93 | /* |
94 | * Called to set up the rlogin connection. |
95 | * |
96 | * Returns an error message, or NULL on success. |
97 | * |
6e1ebb76 |
98 | * Also places the canonical host name into `realhost'. It must be |
99 | * freed by the caller. |
c91409da |
100 | */ |
cbe2d68f |
101 | static const char *rlogin_init(void *frontend_handle, void **backend_handle, |
102 | Config *cfg, |
103 | char *host, int port, char **realhost, |
79bf227b |
104 | int nodelay, int keepalive) |
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105 | { |
51470298 |
106 | static const struct plug_function_table fn_table = { |
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107 | rlogin_closing, |
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108 | rlogin_receive, |
109 | rlogin_sent |
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110 | }; |
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111 | SockAddr addr; |
cbe2d68f |
112 | const char *err; |
51470298 |
113 | Rlogin rlogin; |
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114 | |
3d88e64d |
115 | rlogin = snew(struct rlogin_tag); |
51470298 |
116 | rlogin->fn = &fn_table; |
117 | rlogin->s = NULL; |
118 | rlogin->frontend = frontend_handle; |
86916870 |
119 | rlogin->term_width = cfg->width; |
120 | rlogin->term_height = cfg->height; |
c85623f9 |
121 | rlogin->firstbyte = 1; |
51470298 |
122 | *backend_handle = rlogin; |
887035a5 |
123 | |
c91409da |
124 | /* |
125 | * Try to find host. |
126 | */ |
3ad9d396 |
127 | { |
57356d63 |
128 | char *buf; |
129 | buf = dupprintf("Looking up host \"%s\"", host); |
a8327734 |
130 | logevent(rlogin->frontend, buf); |
57356d63 |
131 | sfree(buf); |
3ad9d396 |
132 | } |
e8fa8f62 |
133 | addr = name_lookup(host, port, realhost, cfg); |
f85e6f6e |
134 | if ((err = sk_addr_error(addr)) != NULL) { |
135 | sk_addr_free(addr); |
c91409da |
136 | return err; |
f85e6f6e |
137 | } |
c91409da |
138 | |
139 | if (port < 0) |
140 | port = 513; /* default rlogin port */ |
141 | |
142 | /* |
143 | * Open socket. |
144 | */ |
3ad9d396 |
145 | { |
57356d63 |
146 | char *buf, addrbuf[100]; |
3ad9d396 |
147 | sk_getaddr(addr, addrbuf, 100); |
57356d63 |
148 | buf = dupprintf("Connecting to %s port %d", addrbuf, port); |
a8327734 |
149 | logevent(rlogin->frontend, buf); |
57356d63 |
150 | sfree(buf); |
3ad9d396 |
151 | } |
51470298 |
152 | rlogin->s = new_connection(addr, *realhost, port, 1, 0, |
79bf227b |
153 | nodelay, keepalive, (Plug) rlogin, cfg); |
6f1e7b78 |
154 | if ((err = sk_socket_error(rlogin->s)) != NULL) |
c91409da |
155 | return err; |
156 | |
c91409da |
157 | /* |
158 | * Send local username, remote username, terminal/speed |
159 | */ |
160 | |
161 | { |
32874aea |
162 | char z = 0; |
163 | char *p; |
51470298 |
164 | sk_write(rlogin->s, &z, 1); |
86916870 |
165 | sk_write(rlogin->s, cfg->localusername, |
166 | strlen(cfg->localusername)); |
51470298 |
167 | sk_write(rlogin->s, &z, 1); |
86916870 |
168 | sk_write(rlogin->s, cfg->username, |
169 | strlen(cfg->username)); |
51470298 |
170 | sk_write(rlogin->s, &z, 1); |
86916870 |
171 | sk_write(rlogin->s, cfg->termtype, |
172 | strlen(cfg->termtype)); |
51470298 |
173 | sk_write(rlogin->s, "/", 1); |
e93ed432 |
174 | for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue; |
86916870 |
175 | sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed); |
51470298 |
176 | rlogin->bufsize = sk_write(rlogin->s, &z, 1); |
c91409da |
177 | } |
178 | |
c91409da |
179 | return NULL; |
180 | } |
181 | |
fabd1805 |
182 | static void rlogin_free(void *handle) |
183 | { |
184 | Rlogin rlogin = (Rlogin) handle; |
185 | |
186 | if (rlogin->s) |
187 | sk_close(rlogin->s); |
188 | sfree(rlogin); |
189 | } |
190 | |
c91409da |
191 | /* |
86916870 |
192 | * Stub routine (we don't have any need to reconfigure this backend). |
193 | */ |
194 | static void rlogin_reconfig(void *handle, Config *cfg) |
195 | { |
196 | } |
197 | |
198 | /* |
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199 | * Called to send data down the rlogin connection. |
200 | */ |
51470298 |
201 | static int rlogin_send(void *handle, char *buf, int len) |
32874aea |
202 | { |
51470298 |
203 | Rlogin rlogin = (Rlogin) handle; |
204 | |
205 | if (rlogin->s == NULL) |
b5a460cd |
206 | return 0; |
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207 | |
51470298 |
208 | rlogin->bufsize = sk_write(rlogin->s, buf, len); |
5471d09a |
209 | |
51470298 |
210 | return rlogin->bufsize; |
5471d09a |
211 | } |
212 | |
213 | /* |
214 | * Called to query the current socket sendability status. |
215 | */ |
51470298 |
216 | static int rlogin_sendbuffer(void *handle) |
5471d09a |
217 | { |
51470298 |
218 | Rlogin rlogin = (Rlogin) handle; |
219 | return rlogin->bufsize; |
c91409da |
220 | } |
221 | |
222 | /* |
223 | * Called to set the size of the window |
224 | */ |
51470298 |
225 | static void rlogin_size(void *handle, int width, int height) |
32874aea |
226 | { |
51470298 |
227 | Rlogin rlogin = (Rlogin) handle; |
e418595a |
228 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
c91409da |
229 | |
51470298 |
230 | rlogin->term_width = width; |
231 | rlogin->term_height = height; |
f278d6f8 |
232 | |
51470298 |
233 | if (rlogin->s == NULL) |
cf293dd4 |
234 | return; |
f278d6f8 |
235 | |
51470298 |
236 | b[6] = rlogin->term_width >> 8; |
237 | b[7] = rlogin->term_width & 0xFF; |
238 | b[4] = rlogin->term_height >> 8; |
239 | b[5] = rlogin->term_height & 0xFF; |
240 | rlogin->bufsize = sk_write(rlogin->s, b, 12); |
c91409da |
241 | return; |
242 | } |
243 | |
244 | /* |
245 | * Send rlogin special codes. |
246 | */ |
51470298 |
247 | static void rlogin_special(void *handle, Telnet_Special code) |
32874aea |
248 | { |
c91409da |
249 | /* Do nothing! */ |
250 | return; |
251 | } |
252 | |
125105d1 |
253 | /* |
254 | * Return a list of the special codes that make sense in this |
255 | * protocol. |
256 | */ |
257 | static const struct telnet_special *rlogin_get_specials(void *handle) |
258 | { |
259 | return NULL; |
260 | } |
261 | |
51470298 |
262 | static Socket rlogin_socket(void *handle) |
32874aea |
263 | { |
51470298 |
264 | Rlogin rlogin = (Rlogin) handle; |
265 | return rlogin->s; |
32874aea |
266 | } |
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267 | |
51470298 |
268 | static int rlogin_sendok(void *handle) |
32874aea |
269 | { |
68a49acb |
270 | /* Rlogin rlogin = (Rlogin) handle; */ |
32874aea |
271 | return 1; |
272 | } |
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273 | |
51470298 |
274 | static void rlogin_unthrottle(void *handle, int backlog) |
5471d09a |
275 | { |
51470298 |
276 | Rlogin rlogin = (Rlogin) handle; |
277 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
5471d09a |
278 | } |
279 | |
51470298 |
280 | static int rlogin_ldisc(void *handle, int option) |
32874aea |
281 | { |
68a49acb |
282 | /* Rlogin rlogin = (Rlogin) handle; */ |
0965bee0 |
283 | return 0; |
284 | } |
285 | |
b9d7bcad |
286 | static void rlogin_provide_ldisc(void *handle, void *ldisc) |
287 | { |
288 | /* This is a stub. */ |
289 | } |
290 | |
a8327734 |
291 | static void rlogin_provide_logctx(void *handle, void *logctx) |
292 | { |
293 | /* This is a stub. */ |
294 | } |
295 | |
51470298 |
296 | static int rlogin_exitcode(void *handle) |
d8d6c7e5 |
297 | { |
0da1a790 |
298 | Rlogin rlogin = (Rlogin) handle; |
299 | if (rlogin->s != NULL) |
300 | return -1; /* still connected */ |
301 | else |
302 | /* If we ever implement RSH, we'll probably need to do this properly */ |
303 | return 0; |
d8d6c7e5 |
304 | } |
305 | |
f89c3294 |
306 | /* |
307 | * cfg_info for rlogin does nothing at all. |
308 | */ |
309 | static int rlogin_cfg_info(void *handle) |
310 | { |
311 | return 0; |
312 | } |
313 | |
c91409da |
314 | Backend rlogin_backend = { |
315 | rlogin_init, |
fabd1805 |
316 | rlogin_free, |
86916870 |
317 | rlogin_reconfig, |
c91409da |
318 | rlogin_send, |
5471d09a |
319 | rlogin_sendbuffer, |
c91409da |
320 | rlogin_size, |
321 | rlogin_special, |
125105d1 |
322 | rlogin_get_specials, |
c91409da |
323 | rlogin_socket, |
d8d6c7e5 |
324 | rlogin_exitcode, |
c91409da |
325 | rlogin_sendok, |
0965bee0 |
326 | rlogin_ldisc, |
b9d7bcad |
327 | rlogin_provide_ldisc, |
a8327734 |
328 | rlogin_provide_logctx, |
5471d09a |
329 | rlogin_unthrottle, |
f89c3294 |
330 | rlogin_cfg_info, |
c91409da |
331 | 1 |
332 | }; |