c91409da |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
b6c680d4 |
3 | #include <ctype.h> |
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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 | |
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20 | Socket s; |
21 | int bufsize; |
22 | int term_width, term_height; |
23 | void *frontend; |
24 | } *Rlogin; |
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25 | |
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26 | static void rlogin_size(void *handle, int width, int height); |
27 | |
28 | static void c_write(Rlogin rlogin, char *buf, int len) |
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29 | { |
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30 | int backlog = from_backend(rlogin->frontend, 0, buf, len); |
31 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
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32 | } |
33 | |
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34 | static int rlogin_closing(Plug plug, char *error_msg, int error_code, |
35 | int calling_back) |
36 | { |
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37 | Rlogin rlogin = (Rlogin) plug; |
38 | if (rlogin->s) { |
39 | sk_close(rlogin->s); |
40 | rlogin->s = NULL; |
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41 | } |
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42 | if (error_msg) { |
32874aea |
43 | /* A socket error has occurred. */ |
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44 | logevent(rlogin->frontend, error_msg); |
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45 | connection_fatal("%s", error_msg); |
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46 | } /* Otherwise, the remote side closed the connection normally. */ |
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47 | return 0; |
48 | } |
49 | |
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50 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
51 | { |
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52 | Rlogin rlogin = (Rlogin) plug; |
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53 | if (urgent == 2) { |
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54 | char c; |
55 | |
56 | c = *data++; |
57 | len--; |
58 | if (c == '\x80') |
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59 | rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); |
32874aea |
60 | /* |
61 | * We should flush everything (aka Telnet SYNCH) if we see |
62 | * 0x02, and we should turn off and on _local_ flow control |
63 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
64 | * worth it... |
65 | */ |
8a5fb9e3 |
66 | } else { |
32874aea |
67 | /* |
68 | * Main rlogin protocol. This is really simple: the first |
69 | * byte is expected to be NULL and is ignored, and the rest |
70 | * is printed. |
71 | */ |
72 | static int firstbyte = 1; |
73 | if (firstbyte) { |
74 | if (data[0] == '\0') { |
75 | data++; |
76 | len--; |
77 | } |
78 | firstbyte = 0; |
79 | } |
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80 | if (len > 0) |
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81 | c_write(rlogin, data, len); |
c91409da |
82 | } |
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83 | return 1; |
84 | } |
85 | |
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86 | static void rlogin_sent(Plug plug, int bufsize) |
87 | { |
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88 | Rlogin rlogin = (Rlogin) plug; |
89 | rlogin->bufsize = bufsize; |
3ad9d396 |
90 | } |
91 | |
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92 | /* |
93 | * Called to set up the rlogin connection. |
94 | * |
95 | * Returns an error message, or NULL on success. |
96 | * |
6e1ebb76 |
97 | * Also places the canonical host name into `realhost'. It must be |
98 | * freed by the caller. |
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99 | */ |
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100 | static char *rlogin_init(void *frontend_handle, void **backend_handle, |
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101 | char *host, int port, char **realhost, int nodelay) |
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102 | { |
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103 | static const struct plug_function_table fn_table = { |
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104 | rlogin_closing, |
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105 | rlogin_receive, |
106 | rlogin_sent |
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107 | }; |
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108 | SockAddr addr; |
109 | char *err; |
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110 | Rlogin rlogin; |
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111 | |
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112 | rlogin = smalloc(sizeof(*rlogin)); |
113 | rlogin->fn = &fn_table; |
114 | rlogin->s = NULL; |
115 | rlogin->frontend = frontend_handle; |
116 | rlogin->term_width = cfg.width; |
117 | rlogin->term_height = cfg.height; |
118 | *backend_handle = rlogin; |
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119 | |
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120 | /* |
121 | * Try to find host. |
122 | */ |
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123 | { |
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124 | char *buf; |
125 | buf = dupprintf("Looking up host \"%s\"", host); |
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126 | logevent(rlogin->frontend, buf); |
57356d63 |
127 | sfree(buf); |
3ad9d396 |
128 | } |
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129 | addr = sk_namelookup(host, realhost); |
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130 | if ((err = sk_addr_error(addr))) |
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131 | return err; |
132 | |
133 | if (port < 0) |
134 | port = 513; /* default rlogin port */ |
135 | |
136 | /* |
137 | * Open socket. |
138 | */ |
3ad9d396 |
139 | { |
57356d63 |
140 | char *buf, addrbuf[100]; |
3ad9d396 |
141 | sk_getaddr(addr, addrbuf, 100); |
57356d63 |
142 | buf = dupprintf("Connecting to %s port %d", addrbuf, port); |
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143 | logevent(rlogin->frontend, buf); |
57356d63 |
144 | sfree(buf); |
3ad9d396 |
145 | } |
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146 | rlogin->s = new_connection(addr, *realhost, port, 1, 0, |
147 | nodelay, (Plug) rlogin); |
148 | if ((err = sk_socket_error(rlogin->s))) |
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149 | return err; |
150 | |
151 | sk_addr_free(addr); |
152 | |
153 | /* |
154 | * Send local username, remote username, terminal/speed |
155 | */ |
156 | |
157 | { |
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158 | char z = 0; |
159 | char *p; |
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160 | sk_write(rlogin->s, &z, 1); |
161 | sk_write(rlogin->s, cfg.localusername, strlen(cfg.localusername)); |
162 | sk_write(rlogin->s, &z, 1); |
163 | sk_write(rlogin->s, cfg.username, strlen(cfg.username)); |
164 | sk_write(rlogin->s, &z, 1); |
165 | sk_write(rlogin->s, cfg.termtype, strlen(cfg.termtype)); |
166 | sk_write(rlogin->s, "/", 1); |
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167 | for (p = cfg.termspeed; isdigit(*p); p++); |
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168 | sk_write(rlogin->s, cfg.termspeed, p - cfg.termspeed); |
169 | rlogin->bufsize = sk_write(rlogin->s, &z, 1); |
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170 | } |
171 | |
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172 | return NULL; |
173 | } |
174 | |
175 | /* |
176 | * Called to send data down the rlogin connection. |
177 | */ |
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178 | static int rlogin_send(void *handle, char *buf, int len) |
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179 | { |
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180 | Rlogin rlogin = (Rlogin) handle; |
181 | |
182 | if (rlogin->s == NULL) |
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183 | return 0; |
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184 | |
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185 | rlogin->bufsize = sk_write(rlogin->s, buf, len); |
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186 | |
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187 | return rlogin->bufsize; |
5471d09a |
188 | } |
189 | |
190 | /* |
191 | * Called to query the current socket sendability status. |
192 | */ |
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193 | static int rlogin_sendbuffer(void *handle) |
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194 | { |
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195 | Rlogin rlogin = (Rlogin) handle; |
196 | return rlogin->bufsize; |
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197 | } |
198 | |
199 | /* |
200 | * Called to set the size of the window |
201 | */ |
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202 | static void rlogin_size(void *handle, int width, int height) |
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203 | { |
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204 | Rlogin rlogin = (Rlogin) handle; |
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205 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
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206 | |
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207 | rlogin->term_width = width; |
208 | rlogin->term_height = height; |
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209 | |
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210 | if (rlogin->s == NULL) |
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211 | return; |
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212 | |
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213 | b[6] = rlogin->term_width >> 8; |
214 | b[7] = rlogin->term_width & 0xFF; |
215 | b[4] = rlogin->term_height >> 8; |
216 | b[5] = rlogin->term_height & 0xFF; |
217 | rlogin->bufsize = sk_write(rlogin->s, b, 12); |
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218 | return; |
219 | } |
220 | |
221 | /* |
222 | * Send rlogin special codes. |
223 | */ |
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224 | static void rlogin_special(void *handle, Telnet_Special code) |
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225 | { |
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226 | /* Do nothing! */ |
227 | return; |
228 | } |
229 | |
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230 | static Socket rlogin_socket(void *handle) |
32874aea |
231 | { |
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232 | Rlogin rlogin = (Rlogin) handle; |
233 | return rlogin->s; |
32874aea |
234 | } |
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235 | |
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236 | static int rlogin_sendok(void *handle) |
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237 | { |
68a49acb |
238 | /* Rlogin rlogin = (Rlogin) handle; */ |
32874aea |
239 | return 1; |
240 | } |
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241 | |
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242 | static void rlogin_unthrottle(void *handle, int backlog) |
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243 | { |
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244 | Rlogin rlogin = (Rlogin) handle; |
245 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
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246 | } |
247 | |
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248 | static int rlogin_ldisc(void *handle, int option) |
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249 | { |
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250 | /* Rlogin rlogin = (Rlogin) handle; */ |
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251 | return 0; |
252 | } |
253 | |
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254 | static void rlogin_provide_ldisc(void *handle, void *ldisc) |
255 | { |
256 | /* This is a stub. */ |
257 | } |
258 | |
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259 | static void rlogin_provide_logctx(void *handle, void *logctx) |
260 | { |
261 | /* This is a stub. */ |
262 | } |
263 | |
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264 | static int rlogin_exitcode(void *handle) |
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265 | { |
68a49acb |
266 | /* Rlogin rlogin = (Rlogin) handle; */ |
d8d6c7e5 |
267 | /* If we ever implement RSH, we'll probably need to do this properly */ |
268 | return 0; |
269 | } |
270 | |
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271 | Backend rlogin_backend = { |
272 | rlogin_init, |
273 | rlogin_send, |
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274 | rlogin_sendbuffer, |
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275 | rlogin_size, |
276 | rlogin_special, |
277 | rlogin_socket, |
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278 | rlogin_exitcode, |
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279 | rlogin_sendok, |
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280 | rlogin_ldisc, |
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281 | rlogin_provide_ldisc, |
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282 | rlogin_provide_logctx, |
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283 | rlogin_unthrottle, |
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284 | 1 |
285 | }; |