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1 | #include <windows.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
4 | #include <winsock.h> |
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 | |
15 | static SOCKET s = INVALID_SOCKET; |
16 | |
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17 | static void raw_size(void); |
18 | |
19 | static int sb_opt, sb_len; |
20 | static char *sb_buf = NULL; |
21 | static int sb_size = 0; |
22 | #define SB_DELTA 1024 |
23 | |
24 | static void try_write (void) { |
25 | while (outbuf_head != outbuf_reap) { |
26 | int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE); |
27 | int len = end - outbuf_reap; |
28 | int ret; |
29 | |
30 | ret = send (s, outbuf+outbuf_reap, len, 0); |
31 | if (ret > 0) |
32 | outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK; |
33 | if (ret < len) |
34 | return; |
35 | } |
36 | } |
37 | |
38 | static void s_write (void *buf, int len) { |
39 | unsigned char *p = buf; |
40 | while (len--) { |
41 | int new_head = (outbuf_head + 1) & OUTBUF_MASK; |
42 | if (new_head != outbuf_reap) { |
43 | outbuf[outbuf_head] = *p++; |
44 | outbuf_head = new_head; |
45 | } |
46 | } |
47 | try_write(); |
48 | } |
49 | |
50 | static void c_write (char *buf, int len) { |
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51 | while (len--) |
52 | c_write1(*buf++); |
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53 | } |
54 | |
55 | /* |
56 | * Called to set up the raw connection. Will arrange for |
57 | * WM_NETEVENT messages to be passed to the specified window, whose |
58 | * window procedure should then call raw_msg(). |
59 | * |
60 | * Returns an error message, or NULL on success. |
61 | * |
62 | * Also places the canonical host name into `realhost'. |
63 | */ |
64 | static char *raw_init (HWND hwnd, char *host, int port, char **realhost) { |
65 | SOCKADDR_IN addr; |
66 | struct hostent *h; |
67 | unsigned long a; |
68 | |
69 | /* |
70 | * Try to find host. |
71 | */ |
72 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
73 | if ( (h = gethostbyname(host)) == NULL) |
74 | switch (WSAGetLastError()) { |
75 | case WSAENETDOWN: return "Network is down"; |
76 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
77 | return "Host does not exist"; |
78 | case WSATRY_AGAIN: return "Host not found"; |
79 | default: return "gethostbyname: unknown error"; |
80 | } |
81 | memcpy (&a, h->h_addr, sizeof(a)); |
82 | *realhost = h->h_name; |
83 | } else |
84 | *realhost = host; |
85 | a = ntohl(a); |
86 | |
87 | if (port < 0) |
88 | port = 23; /* default telnet port */ |
89 | |
90 | /* |
91 | * Open socket. |
92 | */ |
93 | s = socket(AF_INET, SOCK_STREAM, 0); |
94 | if (s == INVALID_SOCKET) |
95 | switch (WSAGetLastError()) { |
96 | case WSAENETDOWN: return "Network is down"; |
97 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
98 | default: return "socket(): unknown error"; |
99 | } |
100 | |
101 | /* |
102 | * Bind to local address. |
103 | */ |
104 | addr.sin_family = AF_INET; |
105 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
106 | addr.sin_port = htons(0); |
107 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
108 | switch (WSAGetLastError()) { |
109 | case WSAENETDOWN: return "Network is down"; |
110 | default: return "bind(): unknown error"; |
111 | } |
112 | |
113 | /* |
114 | * Connect to remote address. |
115 | */ |
116 | addr.sin_addr.s_addr = htonl(a); |
117 | addr.sin_port = htons((short)port); |
118 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
119 | switch (WSAGetLastError()) { |
120 | case WSAENETDOWN: return "Network is down"; |
121 | case WSAECONNREFUSED: return "Connection refused"; |
122 | case WSAENETUNREACH: return "Network is unreachable"; |
123 | case WSAEHOSTUNREACH: return "No route to host"; |
124 | default: return "connect(): unknown error"; |
125 | } |
126 | |
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127 | if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | |
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128 | FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR) |
129 | switch (WSAGetLastError()) { |
130 | case WSAENETDOWN: return "Network is down"; |
131 | default: return "WSAAsyncSelect(): unknown error"; |
132 | } |
133 | |
134 | return NULL; |
135 | } |
136 | |
137 | /* |
138 | * Process a WM_NETEVENT message. Will return 0 if the connection |
139 | * has closed, or <0 for a socket error. |
140 | */ |
141 | static int raw_msg (WPARAM wParam, LPARAM lParam) { |
142 | int ret; |
143 | char buf[256]; |
144 | |
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145 | /* |
146 | * Because reading less than the whole of the available pending |
147 | * data can generate an FD_READ event, we need to allow for the |
148 | * possibility that FD_READ may arrive with FD_CLOSE already in |
149 | * the queue; so it's possible that we can get here even with s |
150 | * invalid. If so, we return 1 and don't worry about it. |
151 | */ |
152 | if (s == INVALID_SOCKET) |
153 | return 1; |
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154 | |
155 | if (WSAGETSELECTERROR(lParam) != 0) |
156 | return -WSAGETSELECTERROR(lParam); |
157 | |
158 | switch (WSAGETSELECTEVENT(lParam)) { |
159 | case FD_READ: |
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160 | case FD_CLOSE: |
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161 | ret = recv(s, buf, sizeof(buf), 0); |
162 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
163 | return 1; |
164 | if (ret < 0) /* any _other_ error */ |
165 | return -10000-WSAGetLastError(); |
166 | if (ret == 0) { |
167 | s = INVALID_SOCKET; |
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168 | return 0; |
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169 | } |
170 | c_write( buf, ret ); |
171 | return 1; |
172 | case FD_OOB: |
173 | do { |
174 | ret = recv(s, buf, sizeof(buf), 0); |
175 | c_write( buf, ret ); |
176 | } while (ret > 0); |
177 | do { |
178 | ret = recv(s, buf, 1, MSG_OOB); |
179 | } while (ret > 0); |
180 | if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK) |
181 | return -30000-WSAGetLastError(); |
182 | return 1; |
183 | case FD_WRITE: |
184 | if (outbuf_head != outbuf_reap) |
185 | try_write(); |
186 | return 1; |
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187 | } |
188 | return 1; /* shouldn't happen, but WTF */ |
189 | } |
190 | |
191 | /* |
192 | * Called to send data down the raw connection. |
193 | */ |
194 | static void raw_send (char *buf, int len) { |
195 | |
196 | if (s == INVALID_SOCKET) |
197 | return; |
198 | |
199 | s_write( buf, len ); |
200 | } |
201 | |
202 | /* |
203 | * Called to set the size of the window |
204 | */ |
205 | static void raw_size(void) { |
206 | /* Do nothing! */ |
207 | return; |
208 | } |
209 | |
210 | /* |
211 | * Send raw special codes. |
212 | */ |
213 | static void raw_special (Telnet_Special code) { |
214 | /* Do nothing! */ |
215 | return; |
216 | } |
217 | |
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218 | SOCKET raw_socket(void) { return s; } |
219 | |
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220 | Backend raw_backend = { |
221 | raw_init, |
222 | raw_msg, |
223 | raw_send, |
224 | raw_size, |
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225 | raw_special, |
226 | raw_socket |
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227 | }; |