c91409da |
1 | #include <windows.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
b6c680d4 |
4 | #include <ctype.h> |
c91409da |
5 | |
6 | #include "putty.h" |
7 | |
8 | #ifndef FALSE |
9 | #define FALSE 0 |
10 | #endif |
11 | #ifndef TRUE |
12 | #define TRUE 1 |
13 | #endif |
14 | |
5471d09a |
15 | #define RLOGIN_MAX_BACKLOG 4096 |
16 | |
c91409da |
17 | static Socket s = NULL; |
5471d09a |
18 | static int rlogin_bufsize; |
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19 | |
20 | static void rlogin_size(void); |
21 | |
32874aea |
22 | static void c_write(char *buf, int len) |
23 | { |
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24 | int backlog = from_backend(0, buf, len); |
25 | sk_set_frozen(s, backlog > RLOGIN_MAX_BACKLOG); |
c91409da |
26 | } |
27 | |
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28 | static int rlogin_closing(Plug plug, char *error_msg, int error_code, |
29 | int calling_back) |
30 | { |
f3ab576e |
31 | if (s) { |
32 | sk_close(s); |
33 | s = NULL; |
34 | } |
7e78000d |
35 | if (error_msg) { |
32874aea |
36 | /* A socket error has occurred. */ |
37 | connection_fatal(error_msg); |
38 | } /* Otherwise, the remote side closed the connection normally. */ |
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39 | return 0; |
40 | } |
41 | |
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42 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
43 | { |
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44 | if (urgent == 2) { |
32874aea |
45 | char c; |
46 | |
47 | c = *data++; |
48 | len--; |
49 | if (c == '\x80') |
50 | rlogin_size(); |
51 | /* |
52 | * We should flush everything (aka Telnet SYNCH) if we see |
53 | * 0x02, and we should turn off and on _local_ flow control |
54 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
55 | * worth it... |
56 | */ |
8a5fb9e3 |
57 | } else { |
32874aea |
58 | /* |
59 | * Main rlogin protocol. This is really simple: the first |
60 | * byte is expected to be NULL and is ignored, and the rest |
61 | * is printed. |
62 | */ |
63 | static int firstbyte = 1; |
64 | if (firstbyte) { |
65 | if (data[0] == '\0') { |
66 | data++; |
67 | len--; |
68 | } |
69 | firstbyte = 0; |
70 | } |
2b0c045b |
71 | if (len > 0) |
72 | c_write(data, len); |
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73 | } |
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74 | return 1; |
75 | } |
76 | |
3ad9d396 |
77 | static void rlogin_sent(Plug plug, int bufsize) |
78 | { |
79 | rlogin_bufsize = bufsize; |
80 | } |
81 | |
c91409da |
82 | /* |
83 | * Called to set up the rlogin connection. |
84 | * |
85 | * Returns an error message, or NULL on success. |
86 | * |
6e1ebb76 |
87 | * Also places the canonical host name into `realhost'. It must be |
88 | * freed by the caller. |
c91409da |
89 | */ |
2184a5d9 |
90 | static char *rlogin_init(char *host, int port, char **realhost, int nodelay) |
32874aea |
91 | { |
7e78000d |
92 | static struct plug_function_table fn_table = { |
93 | rlogin_closing, |
3ad9d396 |
94 | rlogin_receive, |
95 | rlogin_sent |
7e78000d |
96 | }, *fn_table_ptr = &fn_table; |
97 | |
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98 | SockAddr addr; |
99 | char *err; |
100 | |
101 | /* |
102 | * Try to find host. |
103 | */ |
3ad9d396 |
104 | { |
105 | char buf[200]; |
106 | sprintf(buf, "Looking up host \"%.170s\"", host); |
107 | logevent(buf); |
108 | } |
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109 | addr = sk_namelookup(host, realhost); |
32874aea |
110 | if ((err = sk_addr_error(addr))) |
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111 | return err; |
112 | |
113 | if (port < 0) |
114 | port = 513; /* default rlogin port */ |
115 | |
116 | /* |
117 | * Open socket. |
118 | */ |
3ad9d396 |
119 | { |
120 | char buf[200], addrbuf[100]; |
121 | sk_getaddr(addr, addrbuf, 100); |
122 | sprintf(buf, "Connecting to %.100s port %d", addrbuf, port); |
123 | logevent(buf); |
124 | } |
2184a5d9 |
125 | s = sk_new(addr, port, 1, 0, nodelay, &fn_table_ptr); |
32874aea |
126 | if ((err = sk_socket_error(s))) |
c91409da |
127 | return err; |
128 | |
129 | sk_addr_free(addr); |
130 | |
131 | /* |
132 | * Send local username, remote username, terminal/speed |
133 | */ |
134 | |
135 | { |
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136 | char z = 0; |
137 | char *p; |
138 | sk_write(s, &z, 1); |
139 | sk_write(s, cfg.localusername, strlen(cfg.localusername)); |
140 | sk_write(s, &z, 1); |
141 | sk_write(s, cfg.username, strlen(cfg.username)); |
142 | sk_write(s, &z, 1); |
143 | sk_write(s, cfg.termtype, strlen(cfg.termtype)); |
144 | sk_write(s, "/", 1); |
145 | for (p = cfg.termspeed; isdigit(*p); p++); |
146 | sk_write(s, cfg.termspeed, p - cfg.termspeed); |
5471d09a |
147 | rlogin_bufsize = sk_write(s, &z, 1); |
c91409da |
148 | } |
149 | |
c91409da |
150 | return NULL; |
151 | } |
152 | |
153 | /* |
154 | * Called to send data down the rlogin connection. |
155 | */ |
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156 | static int rlogin_send(char *buf, int len) |
32874aea |
157 | { |
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158 | if (s == NULL) |
b5a460cd |
159 | return 0; |
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160 | |
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161 | rlogin_bufsize = sk_write(s, buf, len); |
162 | |
163 | return rlogin_bufsize; |
164 | } |
165 | |
166 | /* |
167 | * Called to query the current socket sendability status. |
168 | */ |
169 | static int rlogin_sendbuffer(void) |
170 | { |
171 | return rlogin_bufsize; |
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172 | } |
173 | |
174 | /* |
175 | * Called to set the size of the window |
176 | */ |
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177 | static void rlogin_size(void) |
178 | { |
e418595a |
179 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
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180 | |
cf293dd4 |
181 | if (s == NULL) |
182 | return; |
183 | |
32874aea |
184 | b[6] = cols >> 8; |
185 | b[7] = cols & 0xFF; |
186 | b[4] = rows >> 8; |
187 | b[5] = rows & 0xFF; |
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188 | rlogin_bufsize = sk_write(s, b, 12); |
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189 | return; |
190 | } |
191 | |
192 | /* |
193 | * Send rlogin special codes. |
194 | */ |
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195 | static void rlogin_special(Telnet_Special code) |
196 | { |
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197 | /* Do nothing! */ |
198 | return; |
199 | } |
200 | |
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201 | static Socket rlogin_socket(void) |
202 | { |
203 | return s; |
204 | } |
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205 | |
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206 | static int rlogin_sendok(void) |
207 | { |
208 | return 1; |
209 | } |
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210 | |
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211 | static void rlogin_unthrottle(int backlog) |
212 | { |
213 | sk_set_frozen(s, backlog > RLOGIN_MAX_BACKLOG); |
214 | } |
215 | |
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216 | static int rlogin_ldisc(int option) |
217 | { |
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218 | return 0; |
219 | } |
220 | |
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221 | static int rlogin_exitcode(void) |
222 | { |
223 | /* If we ever implement RSH, we'll probably need to do this properly */ |
224 | return 0; |
225 | } |
226 | |
c91409da |
227 | Backend rlogin_backend = { |
228 | rlogin_init, |
229 | rlogin_send, |
5471d09a |
230 | rlogin_sendbuffer, |
c91409da |
231 | rlogin_size, |
232 | rlogin_special, |
233 | rlogin_socket, |
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234 | rlogin_exitcode, |
c91409da |
235 | rlogin_sendok, |
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236 | rlogin_ldisc, |
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237 | rlogin_unthrottle, |
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238 | 1 |
239 | }; |