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
= {