21 static SOCKET s = INVALID_SOCKET;
23 static void raw_size(void);
25 static int sb_opt, sb_len;
26 static char *sb_buf = NULL;
27 static int sb_size = 0;
30 static void try_write (void) {
31 while (outbuf_head != outbuf_reap) {
32 int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
33 int len = end - outbuf_reap;
36 ret = send (s, outbuf+outbuf_reap, len, 0);
38 outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
44 static void s_write (void *buf, int len) {
45 unsigned char *p = buf;
47 int new_head = (outbuf_head + 1) & OUTBUF_MASK;
48 if (new_head != outbuf_reap) {
49 outbuf[outbuf_head] = *p++;
50 outbuf_head = new_head;
56 static void c_write (char *buf, int len) {
57 from_backend(0, buf, len);
61 * Called to set up the raw connection. Will arrange for
62 * WM_NETEVENT messages to be passed to the specified window, whose
63 * window procedure should then call raw_msg().
65 * Returns an error message, or NULL on success.
67 * Also places the canonical host name into `realhost'.
69 static char *raw_init (HWND hwnd, char *host, int port, char **realhost) {
77 if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
78 if ( (h = gethostbyname(host)) == NULL)
79 switch (WSAGetLastError()) {
80 case WSAENETDOWN: return "Network is down";
81 case WSAHOST_NOT_FOUND: case WSANO_DATA:
82 return "Host does not exist";
83 case WSATRY_AGAIN: return "Host not found";
84 default: return "gethostbyname: unknown error";
86 memcpy (&a, h->h_addr, sizeof(a));
87 *realhost = h->h_name;
93 port = 23; /* default telnet port */
98 s = socket(AF_INET, SOCK_STREAM, 0);
99 if (s == INVALID_SOCKET)
100 switch (WSAGetLastError()) {
101 case WSAENETDOWN: return "Network is down";
102 case WSAEAFNOSUPPORT: return "TCP/IP support not present";
103 default: return "socket(): unknown error";
107 * Bind to local address.
109 addr.sin_family = AF_INET;
110 addr.sin_addr.s_addr = htonl(INADDR_ANY);
111 addr.sin_port = htons(0);
112 if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
113 switch (WSAGetLastError()) {
114 case WSAENETDOWN: return "Network is down";
115 default: return "bind(): unknown error";
119 * Connect to remote address.
121 addr.sin_addr.s_addr = htonl(a);
122 addr.sin_port = htons((short)port);
123 if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
124 switch (WSAGetLastError()) {
125 case WSAENETDOWN: return "Network is down";
126 case WSAECONNREFUSED: return "Connection refused";
127 case WSAENETUNREACH: return "Network is unreachable";
128 case WSAEHOSTUNREACH: return "No route to host";
129 default: return "connect(): unknown error";
132 if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
133 FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
134 switch (WSAGetLastError()) {
135 case WSAENETDOWN: return "Network is down";
136 default: return "WSAAsyncSelect(): unknown error";
140 * We have no pre-session phase.
148 * Process a WM_NETEVENT message. Will return 0 if the connection
149 * has closed, or <0 for a socket error.
151 static int raw_msg (WPARAM wParam, LPARAM lParam) {
156 * Because reading less than the whole of the available pending
157 * data can generate an FD_READ event, we need to allow for the
158 * possibility that FD_READ may arrive with FD_CLOSE already in
159 * the queue; so it's possible that we can get here even with s
160 * invalid. If so, we return 1 and don't worry about it.
162 if (s == INVALID_SOCKET) {
168 if (WSAGETSELECTERROR(lParam) != 0)
169 return -WSAGETSELECTERROR(lParam);
171 switch (WSAGETSELECTEVENT(lParam)) {
174 ret = recv(s, buf, sizeof(buf), 0);
175 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
177 if (ret < 0) { /* any _other_ error */
180 return -10000-WSAGetLastError();
190 ret = recv(s, buf, sizeof(buf), 0);
194 ret = recv(s, buf, 1, MSG_OOB);
196 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
197 return -30000-WSAGetLastError();
200 if (outbuf_head != outbuf_reap)
204 return 1; /* shouldn't happen, but WTF */
208 * Called to send data down the raw connection.
210 static void raw_send (char *buf, int len) {
212 if (s == INVALID_SOCKET)
219 * Called to set the size of the window
221 static void raw_size(void) {
227 * Send raw special codes.
229 static void raw_special (Telnet_Special code) {
234 static SOCKET raw_socket(void) { return s; }
236 static int raw_sendok(void) { return 1; }
238 Backend raw_backend = {