Port forwarding module now passes backend handles around properly.

As a result I've now been able to turn the global variables `back'
and `backhandle' into module-level statics in the individual front
ends. Now _that's_ progress!

[originally from svn r2142]

plink.c

@@ -69,6 +69,9 @@ DWORD orig_console_mode;
 
 WSAEVENT netevent;
 
+static Backend *back;
+static void *backhandle;
+
 int term_ldisc(Terminal *term, int mode)
 {
     return FALSE;

portfwd.c

@@ -61,6 +61,8 @@ struct PFwdPrivate {
     struct plug_function_table *fn;
     /* the above variable absolutely *must* be the first in this structure */
     void *c;			       /* (channel) data used by ssh.c */
+    void *backhandle;		       /* instance of SSH backend itself */
+    /* Note that backhandle need not be filled in if c is non-NULL */
     Socket s;
     char hostname[128];
     int throttled, throttle_override;
@@ -137,6 +139,7 @@ char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
     pr->throttled = pr->throttle_override = 0;
     pr->ready = 1;
     pr->c = c;
+    pr->backhandle = NULL;	       /* we shouldn't need this */
 
     pr->s = *s = new_connection(addr, dummy_realhost, port, 0, 1, 0, (Plug) pr);
     if ((err = sk_socket_error(*s))) {
@@ -170,6 +173,7 @@ static int pfd_accepting(Plug p, void *sock)
     pr->fn = &fn_table;
 
     pr->c = NULL;
+    pr->backhandle = org->backhandle;
 
     pr->s = s = sk_register(sock, (Plug) pr);
     if ((err = sk_socket_error(s))) {
@@ -177,7 +181,7 @@ static int pfd_accepting(Plug p, void *sock)
 	return err != NULL;
     }
 
-    pr->c = new_sock_channel(backhandle, s);
+    pr->c = new_sock_channel(org->backhandle, s);
 
     strcpy(pr->hostname, org->hostname);
     pr->port = org->port;
@@ -192,8 +196,7 @@ static int pfd_accepting(Plug p, void *sock)
 	return 1;
     } else {
 	/* asks to forward to the specified host/port for this */
-	ssh_send_port_open(backhandle, pr->c, pr->hostname,
+	ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding");
-			   pr->port, "forwarding");
     }
 
     return 0;
@@ -203,7 +206,7 @@ static int pfd_accepting(Plug p, void *sock)
 /* Add a new forwarding from port -> desthost:destport
  sets up a listener on the local machine on port
  */
-char *pfd_addforward(char *desthost, int destport, int port)
+char *pfd_addforward(char *desthost, int destport, int port, void *backhandle)
 {
     static struct plug_function_table fn_table = {
 	pfd_closing,
@@ -227,6 +230,7 @@ char *pfd_addforward(char *desthost, int destport, int port)
     pr->throttled = pr->throttle_override = 0;
     pr->ready = 0;
     pr->waiting = NULL;
+    pr->backhandle = backhandle;
 
     pr->s = s = new_listener(port, (Plug) pr, !cfg.lport_acceptall);
     if ((err = sk_socket_error(s))) {

psftp.c

@@ -32,6 +32,8 @@ static int do_sftp_init(void);
  */
 
 char *pwd, *homedir;
+static Backend *back;
+static void *backhandle;
 
 /* ----------------------------------------------------------------------
  * Higher-level helper functions used in commands.
@@ -1484,7 +1486,7 @@ void connection_fatal(char *fmt, ...)
     cleanup_exit(1);
 }
 
-void ldisc_send(char *buf, int len, int interactive)
+void ldisc_send(void *handle, char *buf, int len, int interactive)
 {
     /*
      * This is only here because of the calls to ldisc_send(NULL,

putty.h

@@ -23,17 +23,6 @@ typedef struct terminal_tag Terminal;
 #include "puttyps.h"
 #include "network.h"
 
-/*
- * Global variables. Most modules declare these `extern', but
- * window.c will do `#define PUTTY_DO_GLOBALS' before including this
- * module, and so will get them properly defined.
- */
-#ifdef PUTTY_DO_GLOBALS
-#define GLOBAL
-#else
-#define GLOBAL extern
-#endif
-
 /* Three attribute types: 
  * The ATTRs (normal attributes) are stored with the characters in the main
  * display arrays
@@ -104,9 +93,6 @@ GLOBAL int alt_pressed;
 
 GLOBAL int session_closed;
 
-GLOBAL char *help_path;
-GLOBAL int help_has_contents;
-
 GLOBAL int nsessions;
 GLOBAL char **sessions;
 
@@ -209,9 +195,6 @@ struct backend_tag {
     int default_port;
 };
 
-GLOBAL Backend *back;
-GLOBAL void *backhandle;
-
 extern struct backend_list {
     int protocol;
     char *name;

scp.c

@@ -99,6 +99,9 @@ static int gui_mode = 0;
 static char *gui_hwnd = NULL;
 static int using_sftp = 0;
 
+static Backend *back;
+static void *backhandle;
+
 static void source(char *src);
 static void rsource(char *src);
 static void sink(char *targ, char *src);
@@ -117,7 +120,7 @@ static void gui_update_stats(char *name, unsigned long size,
  */
 #define MAX_SCP_BUFSIZE 16384
 
-void ldisc_send(char *buf, int len, int interactive)
+void ldisc_send(void *handle, char *buf, int len, int interactive)
 {
     /*
      * This is only here because of the calls to ldisc_send(NULL,

ssh.c

@@ -320,7 +320,8 @@ extern void x11_unthrottle(Socket s);
 extern void x11_override_throttle(Socket s, int enable);
 
 extern char *pfd_newconnect(Socket * s, char *hostname, int port, void *c);
-extern char *pfd_addforward(char *desthost, int destport, int port);
+extern char *pfd_addforward(char *desthost, int destport, int port,
+			    void *backhandle);
 extern void pfd_close(Socket s);
 extern int pfd_send(Socket s, char *data, int len);
 extern void pfd_confirm(Socket s);
@@ -3113,7 +3114,7 @@ static void ssh1_protocol(Ssh ssh, unsigned char *in, int inlen, int ispkt)
 	    }
 	    if (sport && dport) {
 		if (type == 'L') {
-		    pfd_addforward(host, dport, sport);
+		    pfd_addforward(host, dport, sport, ssh);
 		    sprintf(buf, "Local port %.*s%.*s%d%.*s forwarding to"
 			    " %s:%.*s%.*s%d%.*s",
 			    sserv ? strlen(sports) : 0, sports,
@@ -5155,7 +5156,7 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, int ispkt)
 	    }
 	    if (sport && dport) {
 		if (type == 'L') {
-		    pfd_addforward(host, dport, sport);
+		    pfd_addforward(host, dport, sport, ssh);
 		    sprintf(buf, "Local port %.*s%.*s%d%.*s forwarding to"
 			    " %s:%.*s%.*s%d%.*s",
 			    sserv ? strlen(sports) : 0, sports,
@@ -6077,11 +6078,10 @@ void ssh_unthrottle(void *handle, int bufsize)
     }
 }
 
-void ssh_send_port_open(void *handle, void *channel, char *hostname,
+void ssh_send_port_open(void *channel, char *hostname, int port, char *org)
-			int port, char *org)
 {
-    Ssh ssh = (Ssh) handle;
     struct ssh_channel *c = (struct ssh_channel *)channel;
+    Ssh ssh = c->ssh;
     char buf[1024];
 
     sprintf(buf, "Opening forwarded connection to %.512s:%d", hostname, port);

ssh.h

@@ -252,8 +252,7 @@ void logevent(char *);
 
 /* Allocate and register a new channel for port forwarding */
 void *new_sock_channel(void *handle, Socket s);
-void ssh_send_port_open(void *handle, void *channel,
+void ssh_send_port_open(void *channel, char *hostname, int port, char *org);
-			char *hostname, int port, char *org);
 
 Bignum copybn(Bignum b);
 Bignum bn_power_2(int n);

unix/pterm.c

@@ -54,6 +54,8 @@ struct gui_data {
     char icontitle[sizeof(((Config *)0)->wintitle)];
     int master_fd, master_func_id, exited;
     void *ldisc;
+    Backend *back;
+    void *backhandle;
 };
 
 static struct gui_data the_inst;
@@ -887,8 +889,8 @@ void done_with_pty(struct gui_data *inst)
 	gtk_input_remove(inst->master_func_id);
     }
 
-    if (!inst->exited && back->exitcode(backhandle) >= 0) {
+    if (!inst->exited && inst->back->exitcode(inst->backhandle) >= 0) {
-	int exitcode = back->exitcode(backhandle);
+	int exitcode = inst->back->exitcode(inst->backhandle);
 	int clean;
 
 	clean = WIFEXITED(exitcode) && (WEXITSTATUS(exitcode) == 0);
@@ -941,7 +943,7 @@ gint timer_func(gpointer data)
 {
     struct gui_data *inst = (struct gui_data *)data;
 
-    if (back->exitcode(backhandle) >= 0) {
+    if (inst->back->exitcode(inst->backhandle) >= 0) {
 	/*
 	 * The primary child process died. We could keep the
 	 * terminal open for remaining subprocesses to output to,
@@ -1962,14 +1964,14 @@ int main(int argc, char **argv)
 
     term = term_init();
 
-    back = &pty_backend;
+    inst->back = &pty_backend;
-    back->init((void *)term, &backhandle, NULL, 0, NULL, 0);
+    inst->back->init((void *)term, &inst->backhandle, NULL, 0, NULL, 0);
 
-    term_provide_resize_fn(term, back->size, backhandle);
+    term_provide_resize_fn(term, inst->back->size, inst->backhandle);
 
     term_size(term, cfg.height, cfg.width, cfg.savelines);
 
-    inst->ldisc = ldisc_create(term, back, backhandle, inst);
+    inst->ldisc = ldisc_create(term, inst->back, inst->backhandle, inst);
     ldisc_send(inst->ldisc, NULL, 0, 0);/* cause ldisc to notice changes */
 
     inst->master_fd = pty_master_fd;

window.c

@@ -116,6 +116,8 @@ static time_t last_movement = 0;
 static int caret_x = -1, caret_y = -1;
 
 static void *ldisc;
+static Backend *back;
+static void *backhandle;
 
 #define FONT_NORMAL 0
 #define FONT_BOLD 1

winstuff.h

@@ -43,6 +43,12 @@ GLOBAL HWND logbox;
  */
 GLOBAL HINSTANCE hinst;
 
+/*
+ * Details of the help file.
+ */
+GLOBAL char *help_path;
+GLOBAL int help_has_contents;
+
 /*
  * I've just looked in the windows standard headr files for WM_USER, there
  * are hundreds of flags defined using the form WM_USER+123 so I've