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Commit | Line | Data |
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1c1af145 | 1 | /* |
2 | * "Raw" backend. | |
3 | */ | |
4 | ||
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | ||
8 | #include "putty.h" | |
9 | ||
10 | #ifndef FALSE | |
11 | #define FALSE 0 | |
12 | #endif | |
13 | #ifndef TRUE | |
14 | #define TRUE 1 | |
15 | #endif | |
16 | ||
17 | #define RAW_MAX_BACKLOG 4096 | |
18 | ||
19 | typedef struct raw_backend_data { | |
20 | const struct plug_function_table *fn; | |
21 | /* the above field _must_ be first in the structure */ | |
22 | ||
23 | Socket s; | |
24 | int bufsize; | |
25 | void *frontend; | |
26 | } *Raw; | |
27 | ||
28 | static void raw_size(void *handle, int width, int height); | |
29 | ||
30 | static void c_write(Raw raw, char *buf, int len) | |
31 | { | |
32 | int backlog = from_backend(raw->frontend, 0, buf, len); | |
33 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); | |
34 | } | |
35 | ||
36 | static void raw_log(Plug plug, int type, SockAddr addr, int port, | |
37 | const char *error_msg, int error_code) | |
38 | { | |
39 | Raw raw = (Raw) plug; | |
40 | char addrbuf[256], *msg; | |
41 | ||
42 | sk_getaddr(addr, addrbuf, lenof(addrbuf)); | |
43 | ||
44 | if (type == 0) | |
45 | msg = dupprintf("Connecting to %s port %d", addrbuf, port); | |
46 | else | |
47 | msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); | |
48 | ||
49 | logevent(raw->frontend, msg); | |
50 | } | |
51 | ||
52 | static int raw_closing(Plug plug, const char *error_msg, int error_code, | |
53 | int calling_back) | |
54 | { | |
55 | Raw raw = (Raw) plug; | |
56 | ||
57 | if (raw->s) { | |
58 | sk_close(raw->s); | |
59 | raw->s = NULL; | |
60 | notify_remote_exit(raw->frontend); | |
61 | } | |
62 | if (error_msg) { | |
63 | /* A socket error has occurred. */ | |
64 | logevent(raw->frontend, error_msg); | |
65 | connection_fatal(raw->frontend, "%s", error_msg); | |
66 | } /* Otherwise, the remote side closed the connection normally. */ | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int raw_receive(Plug plug, int urgent, char *data, int len) | |
71 | { | |
72 | Raw raw = (Raw) plug; | |
73 | c_write(raw, data, len); | |
74 | return 1; | |
75 | } | |
76 | ||
77 | static void raw_sent(Plug plug, int bufsize) | |
78 | { | |
79 | Raw raw = (Raw) plug; | |
80 | raw->bufsize = bufsize; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Called to set up the raw connection. | |
85 | * | |
86 | * Returns an error message, or NULL on success. | |
87 | * | |
88 | * Also places the canonical host name into `realhost'. It must be | |
89 | * freed by the caller. | |
90 | */ | |
91 | static const char *raw_init(void *frontend_handle, void **backend_handle, | |
92 | Config *cfg, | |
93 | char *host, int port, char **realhost, int nodelay, | |
94 | int keepalive) | |
95 | { | |
96 | static const struct plug_function_table fn_table = { | |
97 | raw_log, | |
98 | raw_closing, | |
99 | raw_receive, | |
100 | raw_sent | |
101 | }; | |
102 | SockAddr addr; | |
103 | const char *err; | |
104 | Raw raw; | |
105 | ||
106 | raw = snew(struct raw_backend_data); | |
107 | raw->fn = &fn_table; | |
108 | raw->s = NULL; | |
109 | *backend_handle = raw; | |
110 | ||
111 | raw->frontend = frontend_handle; | |
112 | ||
113 | /* | |
114 | * Try to find host. | |
115 | */ | |
116 | { | |
117 | char *buf; | |
118 | buf = dupprintf("Looking up host \"%s\"%s", host, | |
119 | (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : | |
120 | (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : | |
121 | ""))); | |
122 | logevent(raw->frontend, buf); | |
123 | sfree(buf); | |
124 | } | |
125 | addr = name_lookup(host, port, realhost, cfg, cfg->addressfamily); | |
126 | if ((err = sk_addr_error(addr)) != NULL) { | |
127 | sk_addr_free(addr); | |
128 | return err; | |
129 | } | |
130 | ||
131 | if (port < 0) | |
132 | port = 23; /* default telnet port */ | |
133 | ||
134 | /* | |
135 | * Open socket. | |
136 | */ | |
137 | raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive, | |
138 | (Plug) raw, cfg); | |
139 | if ((err = sk_socket_error(raw->s)) != NULL) | |
140 | return err; | |
141 | ||
142 | if (*cfg->loghost) { | |
143 | char *colon; | |
144 | ||
145 | sfree(*realhost); | |
146 | *realhost = dupstr(cfg->loghost); | |
147 | colon = strrchr(*realhost, ':'); | |
148 | if (colon) { | |
149 | /* | |
150 | * FIXME: if we ever update this aspect of ssh.c for | |
151 | * IPv6 literal management, this should change in line | |
152 | * with it. | |
153 | */ | |
154 | *colon++ = '\0'; | |
155 | } | |
156 | } | |
157 | ||
158 | return NULL; | |
159 | } | |
160 | ||
161 | static void raw_free(void *handle) | |
162 | { | |
163 | Raw raw = (Raw) handle; | |
164 | ||
165 | if (raw->s) | |
166 | sk_close(raw->s); | |
167 | sfree(raw); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Stub routine (we don't have any need to reconfigure this backend). | |
172 | */ | |
173 | static void raw_reconfig(void *handle, Config *cfg) | |
174 | { | |
175 | } | |
176 | ||
177 | /* | |
178 | * Called to send data down the raw connection. | |
179 | */ | |
180 | static int raw_send(void *handle, char *buf, int len) | |
181 | { | |
182 | Raw raw = (Raw) handle; | |
183 | ||
184 | if (raw->s == NULL) | |
185 | return 0; | |
186 | ||
187 | raw->bufsize = sk_write(raw->s, buf, len); | |
188 | ||
189 | return raw->bufsize; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Called to query the current socket sendability status. | |
194 | */ | |
195 | static int raw_sendbuffer(void *handle) | |
196 | { | |
197 | Raw raw = (Raw) handle; | |
198 | return raw->bufsize; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Called to set the size of the window | |
203 | */ | |
204 | static void raw_size(void *handle, int width, int height) | |
205 | { | |
206 | /* Do nothing! */ | |
207 | return; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Send raw special codes. | |
212 | */ | |
213 | static void raw_special(void *handle, Telnet_Special code) | |
214 | { | |
215 | /* Do nothing! */ | |
216 | return; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Return a list of the special codes that make sense in this | |
221 | * protocol. | |
222 | */ | |
223 | static const struct telnet_special *raw_get_specials(void *handle) | |
224 | { | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | static int raw_connected(void *handle) | |
229 | { | |
230 | Raw raw = (Raw) handle; | |
231 | return raw->s != NULL; | |
232 | } | |
233 | ||
234 | static int raw_sendok(void *handle) | |
235 | { | |
236 | return 1; | |
237 | } | |
238 | ||
239 | static void raw_unthrottle(void *handle, int backlog) | |
240 | { | |
241 | Raw raw = (Raw) handle; | |
242 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); | |
243 | } | |
244 | ||
245 | static int raw_ldisc(void *handle, int option) | |
246 | { | |
247 | if (option == LD_EDIT || option == LD_ECHO) | |
248 | return 1; | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static void raw_provide_ldisc(void *handle, void *ldisc) | |
253 | { | |
254 | /* This is a stub. */ | |
255 | } | |
256 | ||
257 | static void raw_provide_logctx(void *handle, void *logctx) | |
258 | { | |
259 | /* This is a stub. */ | |
260 | } | |
261 | ||
262 | static int raw_exitcode(void *handle) | |
263 | { | |
264 | Raw raw = (Raw) handle; | |
265 | if (raw->s != NULL) | |
266 | return -1; /* still connected */ | |
267 | else | |
268 | /* Exit codes are a meaningless concept in the Raw protocol */ | |
269 | return 0; | |
270 | } | |
271 | ||
272 | /* | |
273 | * cfg_info for Raw does nothing at all. | |
274 | */ | |
275 | static int raw_cfg_info(void *handle) | |
276 | { | |
277 | return 0; | |
278 | } | |
279 | ||
280 | Backend raw_backend = { | |
281 | raw_init, | |
282 | raw_free, | |
283 | raw_reconfig, | |
284 | raw_send, | |
285 | raw_sendbuffer, | |
286 | raw_size, | |
287 | raw_special, | |
288 | raw_get_specials, | |
289 | raw_connected, | |
290 | raw_exitcode, | |
291 | raw_sendok, | |
292 | raw_ldisc, | |
293 | raw_provide_ldisc, | |
294 | raw_provide_logctx, | |
295 | raw_unthrottle, | |
296 | raw_cfg_info, | |
297 | "raw", | |
298 | PROT_RAW, | |
299 | 0 | |
300 | }; |