X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/f3ab576e6a5f34dfedde93fe236d1eac577628d0..514702987c9252fcb0ab98882a6603b3bd0505ce:/raw.c

diff --git a/raw.c b/raw.c
index 86fd5315..f21e3ca9 100644
--- a/raw.c
+++ b/raw.c
@@ -11,35 +11,55 @@
 #define TRUE 1
 #endif
 
-static Socket s = NULL;
+#define RAW_MAX_BACKLOG 4096
 
-static void raw_size(void);
+typedef struct raw_backend_data {
+    const struct plug_function_table *fn;
+    /* the above field _must_ be first in the structure */
 
-static void c_write(char *buf, int len)
+    Socket s;
+    int bufsize;
+    void *frontend;
+} *Raw;
+
+static void raw_size(void *handle, int width, int height);
+
+static void c_write(Raw raw, char *buf, int len)
 {
-    from_backend(0, buf, len);
+    int backlog = from_backend(raw->frontend, 0, buf, len);
+    sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
 }
 
 static int raw_closing(Plug plug, char *error_msg, int error_code,
 		       int calling_back)
 {
-    if (s) {
-        sk_close(s);
-        s = NULL;
+    Raw raw = (Raw) plug;
+
+    if (raw->s) {
+        sk_close(raw->s);
+        raw->s = NULL;
     }
     if (error_msg) {
 	/* A socket error has occurred. */
-	connection_fatal(error_msg);
+	logevent(error_msg);
+	connection_fatal("%s", error_msg);
     }				       /* Otherwise, the remote side closed the connection normally. */
     return 0;
 }
 
 static int raw_receive(Plug plug, int urgent, char *data, int len)
 {
-    c_write(data, len);
+    Raw raw = (Raw) plug;
+    c_write(raw, data, len);
     return 1;
 }
 
+static void raw_sent(Plug plug, int bufsize)
+{
+    Raw raw = (Raw) plug;
+    raw->bufsize = bufsize;
+}
+
 /*
  * Called to set up the raw connection.
  * 
@@ -48,19 +68,33 @@ static int raw_receive(Plug plug, int urgent, char *data, int len)
  * Also places the canonical host name into `realhost'. It must be
  * freed by the caller.
  */
-static char *raw_init(char *host, int port, char **realhost)
+static char *raw_init(void *frontend_handle, void **backend_handle,
+		      char *host, int port, char **realhost, int nodelay)
 {
-    static struct plug_function_table fn_table = {
+    static const struct plug_function_table fn_table = {
 	raw_closing,
-	raw_receive
-    }, *fn_table_ptr = &fn_table;
-
+	raw_receive,
+	raw_sent
+    };
     SockAddr addr;
     char *err;
+    Raw raw;
+
+    raw = smalloc(sizeof(*raw));
+    raw->fn = &fn_table;
+    raw->s = NULL;
+    *backend_handle = raw;
+
+    raw->frontend = frontend_handle;
 
     /*
      * Try to find host.
      */
+    {
+	char buf[200];
+	sprintf(buf, "Looking up host \"%.170s\"", host);
+	logevent(buf);
+    }
     addr = sk_namelookup(host, realhost);
     if ((err = sk_addr_error(addr)))
 	return err;
@@ -71,8 +105,14 @@ static char *raw_init(char *host, int port, char **realhost)
     /*
      * Open socket.
      */
-    s = sk_new(addr, port, 0, 1, &fn_table_ptr);
-    if ((err = sk_socket_error(s)))
+    {
+	char buf[200], addrbuf[100];
+	sk_getaddr(addr, addrbuf, 100);
+	sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
+	logevent(buf);
+    }
+    raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, (Plug) raw);
+    if ((err = sk_socket_error(raw->s)))
 	return err;
 
     sk_addr_free(addr);
@@ -83,19 +123,31 @@ static char *raw_init(char *host, int port, char **realhost)
 /*
  * Called to send data down the raw connection.
  */
-static void raw_send(char *buf, int len)
+static int raw_send(void *handle, char *buf, int len)
 {
+    Raw raw = (Raw) handle;
+
+    if (raw->s == NULL)
+	return 0;
 
-    if (s == NULL)
-	return;
+    raw->bufsize = sk_write(raw->s, buf, len);
 
-    sk_write(s, buf, len);
+    return raw->bufsize;
+}
+
+/*
+ * Called to query the current socket sendability status.
+ */
+static int raw_sendbuffer(void *handle)
+{
+    Raw raw = (Raw) handle;
+    return raw->bufsize;
 }
 
 /*
  * Called to set the size of the window
  */
-static void raw_size(void)
+static void raw_size(void *handle, int width, int height)
 {
     /* Do nothing! */
     return;
@@ -104,36 +156,52 @@ static void raw_size(void)
 /*
  * Send raw special codes.
  */
-static void raw_special(Telnet_Special code)
+static void raw_special(void *handle, Telnet_Special code)
 {
     /* Do nothing! */
     return;
 }
 
-static Socket raw_socket(void)
+static Socket raw_socket(void *handle)
 {
-    return s;
+    Raw raw = (Raw) handle;
+    return raw->s;
 }
 
-static int raw_sendok(void)
+static int raw_sendok(void *handle)
 {
     return 1;
 }
 
-static int raw_ldisc(int option)
+static void raw_unthrottle(void *handle, int backlog)
+{
+    Raw raw = (Raw) handle;
+    sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
+}
+
+static int raw_ldisc(void *handle, int option)
 {
     if (option == LD_EDIT || option == LD_ECHO)
 	return 1;
     return 0;
 }
 
+static int raw_exitcode(void *handle)
+{
+    /* Exit codes are a meaningless concept in the Raw protocol */
+    return 0;
+}
+
 Backend raw_backend = {
     raw_init,
     raw_send,
+    raw_sendbuffer,
     raw_size,
     raw_special,
     raw_socket,
+    raw_exitcode,
     raw_sendok,
     raw_ldisc,
+    raw_unthrottle,
     1
 };