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1 | #include <windows.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.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 | |
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14 | #define RAW_MAX_BACKLOG 4096 |
15 | |
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16 | typedef struct raw_backend_data { |
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 | void *frontend; |
23 | } *Raw; |
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24 | |
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25 | static void raw_size(void *handle, int width, int height); |
26 | |
27 | static void c_write(Raw raw, char *buf, int len) |
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28 | { |
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29 | int backlog = from_backend(raw->frontend, 0, buf, len); |
30 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
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31 | } |
32 | |
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33 | static int raw_closing(Plug plug, char *error_msg, int error_code, |
34 | int calling_back) |
35 | { |
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36 | Raw raw = (Raw) plug; |
37 | |
38 | if (raw->s) { |
39 | sk_close(raw->s); |
40 | raw->s = NULL; |
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41 | } |
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42 | if (error_msg) { |
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43 | /* A socket error has occurred. */ |
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44 | logevent(raw->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 raw_receive(Plug plug, int urgent, char *data, int len) |
51 | { |
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52 | Raw raw = (Raw) plug; |
53 | c_write(raw, data, len); |
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54 | return 1; |
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55 | } |
56 | |
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57 | static void raw_sent(Plug plug, int bufsize) |
58 | { |
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59 | Raw raw = (Raw) plug; |
60 | raw->bufsize = bufsize; |
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61 | } |
62 | |
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63 | /* |
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64 | * Called to set up the raw connection. |
65 | * |
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66 | * Returns an error message, or NULL on success. |
67 | * |
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68 | * Also places the canonical host name into `realhost'. It must be |
69 | * freed by the caller. |
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70 | */ |
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71 | static char *raw_init(void *frontend_handle, void **backend_handle, |
72 | char *host, int port, char **realhost, int nodelay) |
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73 | { |
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74 | static const struct plug_function_table fn_table = { |
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75 | raw_closing, |
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76 | raw_receive, |
77 | raw_sent |
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78 | }; |
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79 | SockAddr addr; |
80 | char *err; |
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81 | Raw raw; |
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82 | |
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83 | raw = smalloc(sizeof(*raw)); |
84 | raw->fn = &fn_table; |
85 | raw->s = NULL; |
86 | *backend_handle = raw; |
87 | |
88 | raw->frontend = frontend_handle; |
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89 | |
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90 | /* |
91 | * Try to find host. |
92 | */ |
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93 | { |
94 | char buf[200]; |
95 | sprintf(buf, "Looking up host \"%.170s\"", host); |
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96 | logevent(raw->frontend, buf); |
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97 | } |
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98 | addr = sk_namelookup(host, realhost); |
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99 | if ((err = sk_addr_error(addr))) |
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100 | return err; |
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101 | |
102 | if (port < 0) |
103 | port = 23; /* default telnet port */ |
104 | |
105 | /* |
106 | * Open socket. |
107 | */ |
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108 | { |
109 | char buf[200], addrbuf[100]; |
110 | sk_getaddr(addr, addrbuf, 100); |
111 | sprintf(buf, "Connecting to %.100s port %d", addrbuf, port); |
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112 | logevent(raw->frontend, buf); |
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113 | } |
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114 | raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, (Plug) raw); |
115 | if ((err = sk_socket_error(raw->s))) |
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116 | return err; |
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117 | |
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118 | sk_addr_free(addr); |
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119 | |
120 | return NULL; |
121 | } |
122 | |
123 | /* |
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124 | * Called to send data down the raw connection. |
125 | */ |
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126 | static int raw_send(void *handle, char *buf, int len) |
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127 | { |
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128 | Raw raw = (Raw) handle; |
129 | |
130 | if (raw->s == NULL) |
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131 | return 0; |
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132 | |
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133 | raw->bufsize = sk_write(raw->s, buf, len); |
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134 | |
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135 | return raw->bufsize; |
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136 | } |
137 | |
138 | /* |
139 | * Called to query the current socket sendability status. |
140 | */ |
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141 | static int raw_sendbuffer(void *handle) |
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142 | { |
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143 | Raw raw = (Raw) handle; |
144 | return raw->bufsize; |
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145 | } |
146 | |
147 | /* |
148 | * Called to set the size of the window |
149 | */ |
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150 | static void raw_size(void *handle, int width, int height) |
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151 | { |
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152 | /* Do nothing! */ |
153 | return; |
154 | } |
155 | |
156 | /* |
157 | * Send raw special codes. |
158 | */ |
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159 | static void raw_special(void *handle, Telnet_Special code) |
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160 | { |
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161 | /* Do nothing! */ |
162 | return; |
163 | } |
164 | |
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165 | static Socket raw_socket(void *handle) |
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166 | { |
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167 | Raw raw = (Raw) handle; |
168 | return raw->s; |
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169 | } |
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170 | |
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171 | static int raw_sendok(void *handle) |
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172 | { |
173 | return 1; |
174 | } |
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175 | |
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176 | static void raw_unthrottle(void *handle, int backlog) |
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177 | { |
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178 | Raw raw = (Raw) handle; |
179 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
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180 | } |
181 | |
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182 | static int raw_ldisc(void *handle, int option) |
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183 | { |
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184 | if (option == LD_EDIT || option == LD_ECHO) |
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185 | return 1; |
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186 | return 0; |
187 | } |
188 | |
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189 | static void raw_provide_ldisc(void *handle, void *ldisc) |
190 | { |
191 | /* This is a stub. */ |
192 | } |
193 | |
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194 | static void raw_provide_logctx(void *handle, void *logctx) |
195 | { |
196 | /* This is a stub. */ |
197 | } |
198 | |
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199 | static int raw_exitcode(void *handle) |
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200 | { |
201 | /* Exit codes are a meaningless concept in the Raw protocol */ |
202 | return 0; |
203 | } |
204 | |
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205 | Backend raw_backend = { |
206 | raw_init, |
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207 | raw_send, |
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208 | raw_sendbuffer, |
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209 | raw_size, |
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210 | raw_special, |
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211 | raw_socket, |
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212 | raw_exitcode, |
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213 | raw_sendok, |
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214 | raw_ldisc, |
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215 | raw_provide_ldisc, |
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216 | raw_provide_logctx, |
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217 | raw_unthrottle, |
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218 | 1 |
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219 | }; |