X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/03f64569e974a774b552b2cfeff55717756f68cb..614e8f54c2208b9e0d9816d060ced109bf5ccc7c:/psftp.c

diff --git a/psftp.c b/psftp.c
index 3ffc671f..49e67492 100644
--- a/psftp.c
+++ b/psftp.c
@@ -1504,11 +1504,34 @@ int main(int argc, char *argv[])
     /* SFTP uses SSH2 by default always */
     cfg.sshprot = 2;
 
-    /* Set up subsystem name. FIXME: fudge for SSH1. */
+    /* Set up subsystem name. */
     strcpy(cfg.remote_cmd, "sftp");
     cfg.ssh_subsys = TRUE;
     cfg.nopty = TRUE;
 
+    /*
+     * Set up fallback option, for SSH1 servers or servers with the
+     * sftp subsystem not enabled but the server binary installed
+     * in the usual place. We only support fallback on Unix
+     * systems, and we use a kludgy piece of shellery which should
+     * try to find sftp-server in various places (the obvious
+     * systemwide spots /usr/lib and /usr/local/lib, and then the
+     * user's PATH) and finally give up.
+     * 
+     *   test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server
+     *   test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server
+     *   exec sftp-server
+     * 
+     * the idea being that this will attempt to use either of the
+     * obvious pathnames and then give up, and when it does give up
+     * it will print the preferred pathname in the error messages.
+     */
+    cfg.remote_cmd_ptr2 =
+	"test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n"
+	"test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n"
+	"exec sftp-server";
+    cfg.ssh_subsys2 = FALSE;
+
     back = &ssh_backend;
 
     err = back->init(cfg.host, cfg.port, &realhost);