X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/799dfcfab944cd604ee0850f37e0dcb07f02d84d..059710302fbac6693280e7a27b3797f49a524c97:/unix/uxplink.c

diff --git a/unix/uxplink.c b/unix/uxplink.c
index 8d0e169a..e59a701b 100644
--- a/unix/uxplink.c
+++ b/unix/uxplink.c
@@ -170,8 +170,6 @@ int from_backend(void *frontend_handle, int is_stderr,
 {
     int osize, esize;
 
-    assert(len > 0);
-
     if (is_stderr) {
 	bufchain_add(&stderr_data, data, len);
 	try_output(1);
@@ -210,6 +208,7 @@ static void usage(void)
     printf("Usage: plink [options] [user@]host [command]\n");
     printf("       (\"host\" can also be a PuTTY saved session name)\n");
     printf("Options:\n");
+    printf("  -V        print version information\n");
     printf("  -v        show verbose messages\n");
     printf("  -load sessname  Load settings from saved session\n");
     printf("  -ssh -telnet -rlogin -raw\n");
@@ -220,17 +219,25 @@ static void usage(void)
     printf("  -batch    disable all interactive prompts\n");
     printf("The following options only apply to SSH connections:\n");
     printf("  -pw passw login with specified password\n");
-    printf("  -D listen-port   Dynamic SOCKS-based port forwarding\n");
-    printf("  -L listen-port:host:port   Forward local port to "
-	   "remote address\n");
-    printf("  -R listen-port:host:port   Forward remote port to"
-	   " local address\n");
+    printf("  -D [listen-IP:]listen-port\n");
+    printf("            Dynamic SOCKS-based port forwarding\n");
+    printf("  -L [listen-IP:]listen-port:host:port\n");
+    printf("            Forward local port to remote address\n");
+    printf("  -R [listen-IP:]listen-port:host:port\n");
+    printf("            Forward remote port to local address\n");
     printf("  -X -x     enable / disable X11 forwarding\n");
     printf("  -A -a     enable / disable agent forwarding\n");
     printf("  -t -T     enable / disable pty allocation\n");
     printf("  -1 -2     force use of particular protocol version\n");
     printf("  -C        enable compression\n");
     printf("  -i key    private key file for authentication\n");
+    printf("  -s        remote command is an SSH subsystem (SSH-2 only)\n");
+    exit(1);
+}
+
+static void version(void)
+{
+    printf("plink: %s\n", ver);
     exit(1);
 }
 
@@ -244,6 +251,7 @@ int main(int argc, char **argv)
     int connopen;
     int exitcode;
     int errors;
+    int use_subsystem = 0;
     void *ldisc, *logctx;
 
     ssh_get_line = console_get_line;
@@ -297,6 +305,11 @@ int main(int argc, char **argv)
 		continue;
 	    } else if (!strcmp(p, "-batch")) {
 		console_batch_mode = 1;
+	    } else if (!strcmp(p, "-s")) {
+                /* Save status to write to cfg later. */
+		use_subsystem = 1;
+	    } else if (!strcmp(p, "-V")) {
+                version();
 	    } else if (!strcmp(p, "-o")) {
                 if (argc <= 1) {
                     fprintf(stderr,
@@ -467,6 +480,12 @@ int main(int argc, char **argv)
     cmdline_run_saved(&cfg);
 
     /*
+     * Apply subsystem status.
+     */
+    if (use_subsystem)
+        cfg.ssh_subsys = TRUE;
+
+    /*
      * Trim a colon suffix off the hostname if it's there.
      */
     cfg.host[strcspn(cfg.host, ":")] = '\0';