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1 | #include <stdio.h> |
2 | #include <stdlib.h> |
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3 | |
4 | #include "putty.h" |
5 | |
6 | #ifndef FALSE |
7 | #define FALSE 0 |
8 | #endif |
9 | #ifndef TRUE |
10 | #define TRUE 1 |
11 | #endif |
12 | |
5471d09a |
13 | #define RAW_MAX_BACKLOG 4096 |
14 | |
51470298 |
15 | typedef struct raw_backend_data { |
16 | const struct plug_function_table *fn; |
17 | /* the above field _must_ be first in the structure */ |
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18 | |
51470298 |
19 | Socket s; |
20 | int bufsize; |
21 | void *frontend; |
22 | } *Raw; |
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23 | |
51470298 |
24 | static void raw_size(void *handle, int width, int height); |
25 | |
26 | static void c_write(Raw raw, char *buf, int len) |
32874aea |
27 | { |
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28 | int backlog = from_backend(raw->frontend, 0, buf, len); |
29 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
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30 | } |
31 | |
cbe2d68f |
32 | static int raw_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
33 | int calling_back) |
34 | { |
51470298 |
35 | Raw raw = (Raw) plug; |
36 | |
37 | if (raw->s) { |
38 | sk_close(raw->s); |
39 | raw->s = NULL; |
f3ab576e |
40 | } |
7e78000d |
41 | if (error_msg) { |
32874aea |
42 | /* A socket error has occurred. */ |
a8327734 |
43 | logevent(raw->frontend, error_msg); |
971bcc0a |
44 | connection_fatal(raw->frontend, "%s", error_msg); |
32874aea |
45 | } /* Otherwise, the remote side closed the connection normally. */ |
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46 | return 0; |
47 | } |
48 | |
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49 | static int raw_receive(Plug plug, int urgent, char *data, int len) |
50 | { |
51470298 |
51 | Raw raw = (Raw) plug; |
52 | c_write(raw, data, len); |
8df7a775 |
53 | return 1; |
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54 | } |
55 | |
3ad9d396 |
56 | static void raw_sent(Plug plug, int bufsize) |
57 | { |
51470298 |
58 | Raw raw = (Raw) plug; |
59 | raw->bufsize = bufsize; |
3ad9d396 |
60 | } |
61 | |
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62 | /* |
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63 | * Called to set up the raw connection. |
64 | * |
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65 | * Returns an error message, or NULL on success. |
66 | * |
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67 | * Also places the canonical host name into `realhost'. It must be |
68 | * freed by the caller. |
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69 | */ |
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70 | static const char *raw_init(void *frontend_handle, void **backend_handle, |
71 | Config *cfg, |
72 | char *host, int port, char **realhost, int nodelay) |
32874aea |
73 | { |
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74 | static const struct plug_function_table fn_table = { |
7e78000d |
75 | raw_closing, |
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76 | raw_receive, |
77 | raw_sent |
51470298 |
78 | }; |
8df7a775 |
79 | SockAddr addr; |
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80 | const char *err; |
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81 | Raw raw; |
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82 | |
3d88e64d |
83 | raw = snew(struct raw_backend_data); |
51470298 |
84 | raw->fn = &fn_table; |
85 | raw->s = NULL; |
86 | *backend_handle = raw; |
87 | |
88 | raw->frontend = frontend_handle; |
887035a5 |
89 | |
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90 | /* |
91 | * Try to find host. |
92 | */ |
3ad9d396 |
93 | { |
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94 | char *buf; |
95 | buf = dupprintf("Looking up host \"%s\"", host); |
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96 | logevent(raw->frontend, buf); |
57356d63 |
97 | sfree(buf); |
3ad9d396 |
98 | } |
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99 | addr = name_lookup(host, port, realhost, cfg); |
f85e6f6e |
100 | if ((err = sk_addr_error(addr)) != NULL) { |
101 | sk_addr_free(addr); |
8df7a775 |
102 | return err; |
f85e6f6e |
103 | } |
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104 | |
105 | if (port < 0) |
106 | port = 23; /* default telnet port */ |
107 | |
108 | /* |
109 | * Open socket. |
110 | */ |
3ad9d396 |
111 | { |
57356d63 |
112 | char *buf, addrbuf[100]; |
3ad9d396 |
113 | sk_getaddr(addr, addrbuf, 100); |
57356d63 |
114 | buf = dupprintf("Connecting to %s port %d", addrbuf, port); |
a8327734 |
115 | logevent(raw->frontend, buf); |
57356d63 |
116 | sfree(buf); |
3ad9d396 |
117 | } |
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118 | raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, |
119 | (Plug) raw, cfg); |
6f1e7b78 |
120 | if ((err = sk_socket_error(raw->s)) != NULL) |
8df7a775 |
121 | return err; |
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122 | |
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123 | return NULL; |
124 | } |
125 | |
fabd1805 |
126 | static void raw_free(void *handle) |
127 | { |
128 | Raw raw = (Raw) handle; |
129 | |
130 | if (raw->s) |
131 | sk_close(raw->s); |
132 | sfree(raw); |
133 | } |
134 | |
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135 | /* |
86916870 |
136 | * Stub routine (we don't have any need to reconfigure this backend). |
137 | */ |
138 | static void raw_reconfig(void *handle, Config *cfg) |
139 | { |
140 | } |
141 | |
142 | /* |
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143 | * Called to send data down the raw connection. |
144 | */ |
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145 | static int raw_send(void *handle, char *buf, int len) |
32874aea |
146 | { |
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147 | Raw raw = (Raw) handle; |
148 | |
149 | if (raw->s == NULL) |
b5a460cd |
150 | return 0; |
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151 | |
51470298 |
152 | raw->bufsize = sk_write(raw->s, buf, len); |
5471d09a |
153 | |
51470298 |
154 | return raw->bufsize; |
5471d09a |
155 | } |
156 | |
157 | /* |
158 | * Called to query the current socket sendability status. |
159 | */ |
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160 | static int raw_sendbuffer(void *handle) |
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161 | { |
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162 | Raw raw = (Raw) handle; |
163 | return raw->bufsize; |
5e1a8e27 |
164 | } |
165 | |
166 | /* |
167 | * Called to set the size of the window |
168 | */ |
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169 | static void raw_size(void *handle, int width, int height) |
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170 | { |
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171 | /* Do nothing! */ |
172 | return; |
173 | } |
174 | |
175 | /* |
176 | * Send raw special codes. |
177 | */ |
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178 | static void raw_special(void *handle, Telnet_Special code) |
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179 | { |
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180 | /* Do nothing! */ |
181 | return; |
182 | } |
183 | |
125105d1 |
184 | /* |
185 | * Return a list of the special codes that make sense in this |
186 | * protocol. |
187 | */ |
188 | static const struct telnet_special *raw_get_specials(void *handle) |
189 | { |
190 | return NULL; |
191 | } |
192 | |
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193 | static Socket raw_socket(void *handle) |
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194 | { |
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195 | Raw raw = (Raw) handle; |
196 | return raw->s; |
32874aea |
197 | } |
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198 | |
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199 | static int raw_sendok(void *handle) |
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200 | { |
201 | return 1; |
202 | } |
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203 | |
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204 | static void raw_unthrottle(void *handle, int backlog) |
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205 | { |
51470298 |
206 | Raw raw = (Raw) handle; |
207 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
5471d09a |
208 | } |
209 | |
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210 | static int raw_ldisc(void *handle, int option) |
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211 | { |
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212 | if (option == LD_EDIT || option == LD_ECHO) |
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213 | return 1; |
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214 | return 0; |
215 | } |
216 | |
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217 | static void raw_provide_ldisc(void *handle, void *ldisc) |
218 | { |
219 | /* This is a stub. */ |
220 | } |
221 | |
a8327734 |
222 | static void raw_provide_logctx(void *handle, void *logctx) |
223 | { |
224 | /* This is a stub. */ |
225 | } |
226 | |
51470298 |
227 | static int raw_exitcode(void *handle) |
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228 | { |
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229 | Raw raw = (Raw) handle; |
230 | if (raw->s != NULL) |
231 | return -1; /* still connected */ |
232 | else |
233 | /* Exit codes are a meaningless concept in the Raw protocol */ |
234 | return 0; |
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235 | } |
236 | |
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237 | Backend raw_backend = { |
238 | raw_init, |
fabd1805 |
239 | raw_free, |
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240 | raw_reconfig, |
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241 | raw_send, |
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242 | raw_sendbuffer, |
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243 | raw_size, |
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244 | raw_special, |
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245 | raw_get_specials, |
8ccc75b0 |
246 | raw_socket, |
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247 | raw_exitcode, |
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248 | raw_sendok, |
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249 | raw_ldisc, |
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250 | raw_provide_ldisc, |
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251 | raw_provide_logctx, |
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252 | raw_unthrottle, |
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253 | 1 |
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254 | }; |