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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 | static Socket s = NULL; |
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17 | static int raw_bufsize; |
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18 | |
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19 | static void raw_size(void); |
20 | |
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21 | static void c_write(char *buf, int len) |
22 | { |
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23 | int backlog = from_backend(0, buf, len); |
24 | sk_set_frozen(s, backlog > RAW_MAX_BACKLOG); |
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25 | } |
26 | |
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27 | static int raw_closing(Plug plug, char *error_msg, int error_code, |
28 | int calling_back) |
29 | { |
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30 | if (s) { |
31 | sk_close(s); |
32 | s = NULL; |
33 | } |
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34 | if (error_msg) { |
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35 | /* A socket error has occurred. */ |
36 | connection_fatal(error_msg); |
37 | } /* Otherwise, the remote side closed the connection normally. */ |
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38 | return 0; |
39 | } |
40 | |
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41 | static int raw_receive(Plug plug, int urgent, char *data, int len) |
42 | { |
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43 | c_write(data, len); |
44 | return 1; |
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45 | } |
46 | |
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47 | static void raw_sent(Plug plug, int bufsize) |
48 | { |
49 | raw_bufsize = bufsize; |
50 | } |
51 | |
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52 | /* |
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53 | * Called to set up the raw connection. |
54 | * |
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55 | * Returns an error message, or NULL on success. |
56 | * |
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57 | * Also places the canonical host name into `realhost'. It must be |
58 | * freed by the caller. |
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59 | */ |
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60 | static char *raw_init(char *host, int port, char **realhost, int nodelay) |
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61 | { |
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62 | static struct plug_function_table fn_table = { |
63 | raw_closing, |
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64 | raw_receive, |
65 | raw_sent |
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66 | }, *fn_table_ptr = &fn_table; |
67 | |
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68 | SockAddr addr; |
69 | char *err; |
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70 | |
71 | /* |
72 | * Try to find host. |
73 | */ |
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74 | { |
75 | char buf[200]; |
76 | sprintf(buf, "Looking up host \"%.170s\"", host); |
77 | logevent(buf); |
78 | } |
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79 | addr = sk_namelookup(host, realhost); |
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80 | if ((err = sk_addr_error(addr))) |
8df7a775 |
81 | return err; |
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82 | |
83 | if (port < 0) |
84 | port = 23; /* default telnet port */ |
85 | |
86 | /* |
87 | * Open socket. |
88 | */ |
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89 | { |
90 | char buf[200], addrbuf[100]; |
91 | sk_getaddr(addr, addrbuf, 100); |
92 | sprintf(buf, "Connecting to %.100s port %d", addrbuf, port); |
93 | logevent(buf); |
94 | } |
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95 | s = sk_new(addr, port, 0, 1, nodelay, &fn_table_ptr); |
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96 | if ((err = sk_socket_error(s))) |
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97 | return err; |
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98 | |
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99 | sk_addr_free(addr); |
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100 | |
101 | return NULL; |
102 | } |
103 | |
104 | /* |
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105 | * Called to send data down the raw connection. |
106 | */ |
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107 | static int raw_send(char *buf, int len) |
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108 | { |
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109 | if (s == NULL) |
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110 | return 0; |
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111 | |
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112 | raw_bufsize = sk_write(s, buf, len); |
113 | |
114 | return raw_bufsize; |
115 | } |
116 | |
117 | /* |
118 | * Called to query the current socket sendability status. |
119 | */ |
120 | static int raw_sendbuffer(void) |
121 | { |
122 | return raw_bufsize; |
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123 | } |
124 | |
125 | /* |
126 | * Called to set the size of the window |
127 | */ |
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128 | static void raw_size(void) |
129 | { |
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130 | /* Do nothing! */ |
131 | return; |
132 | } |
133 | |
134 | /* |
135 | * Send raw special codes. |
136 | */ |
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137 | static void raw_special(Telnet_Special code) |
138 | { |
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139 | /* Do nothing! */ |
140 | return; |
141 | } |
142 | |
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143 | static Socket raw_socket(void) |
144 | { |
145 | return s; |
146 | } |
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147 | |
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148 | static int raw_sendok(void) |
149 | { |
150 | return 1; |
151 | } |
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152 | |
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153 | static void raw_unthrottle(int backlog) |
154 | { |
155 | sk_set_frozen(s, backlog > RAW_MAX_BACKLOG); |
156 | } |
157 | |
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158 | static int raw_ldisc(int option) |
159 | { |
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160 | if (option == LD_EDIT || option == LD_ECHO) |
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161 | return 1; |
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162 | return 0; |
163 | } |
164 | |
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165 | static int raw_exitcode(void) |
166 | { |
167 | /* Exit codes are a meaningless concept in the Raw protocol */ |
168 | return 0; |
169 | } |
170 | |
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171 | Backend raw_backend = { |
172 | raw_init, |
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173 | raw_send, |
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174 | raw_sendbuffer, |
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175 | raw_size, |
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176 | raw_special, |
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177 | raw_socket, |
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178 | raw_exitcode, |
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179 | raw_sendok, |
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180 | raw_ldisc, |
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181 | raw_unthrottle, |
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182 | 1 |
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183 | }; |