15 static SOCKET s = INVALID_SOCKET;
17 static void raw_size(void);
19 static int sb_opt, sb_len;
20 static char *sb_buf = NULL;
21 static int sb_size = 0;
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;
30 ret = send (s, outbuf+outbuf_reap, len, 0);
32 outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
38 static void s_write (void *buf, int len) {
39 unsigned char *p = buf;
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;
50 static void c_write (char *buf, int len) {
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().
60 * Returns an error message, or NULL on success.
62 * Also places the canonical host name into `realhost'.
64 static char *raw_init (HWND hwnd, char *host, int port, char **realhost) {
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";
81 memcpy (&a, h->h_addr, sizeof(a));
82 *realhost = h->h_name;
88 port = 23; /* default telnet port */
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";
102 * Bind to local address.
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";
114 * Connect to remote address.
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";
127 if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
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";
138 * Process a WM_NETEVENT message. Will return 0 if the connection
139 * has closed, or <0 for a socket error.
141 static int raw_msg (WPARAM wParam, LPARAM lParam) {
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.
152 if (s == INVALID_SOCKET)
155 if (WSAGETSELECTERROR(lParam) != 0)
156 return -WSAGETSELECTERROR(lParam);
158 switch (WSAGETSELECTEVENT(lParam)) {
161 ret = recv(s, buf, sizeof(buf), 0);
162 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
164 if (ret < 0) /* any _other_ error */
165 return -10000-WSAGetLastError();
174 ret = recv(s, buf, sizeof(buf), 0);
178 ret = recv(s, buf, 1, MSG_OOB);
180 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
181 return -30000-WSAGetLastError();
184 if (outbuf_head != outbuf_reap)
188 return 1; /* shouldn't happen, but WTF */
192 * Called to send data down the raw connection.
194 static void raw_send (char *buf, int len) {
196 if (s == INVALID_SOCKET)
203 * Called to set the size of the window
205 static void raw_size(void) {
211 * Send raw special codes.
213 static void raw_special (Telnet_Special code) {
218 static SOCKET raw_socket(void) { return s; }
220 static int raw_sendok(void) { return 1; }
222 Backend raw_backend = {