Fix FileIn cmds losing synch if both ends send cancel messages (RHBZ#576879).

[libguestfs.git] / daemon / upload.c

diff --git a/daemon/upload.c b/daemon/upload.c
index b457695..9a6c873 100644 (file)
--- a/daemon/upload.c
+++ b/daemon/upload.c
@@ -1,5 +1,5 @@
 /* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc. 
+ * Copyright (C) 2009 Red Hat Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -28,7 +28,7 @@
 #include "actions.h"
 
 static int
-write_cb (void *fd_ptr, const void *buf, int len)
+write_cb (void *fd_ptr, const void *buf, size_t len)
 {
   int fd = *(int *)fd_ptr;
   return xwrite (fd, buf, len);
@@ -40,27 +40,26 @@ do_upload (const char *filename)
 {
   int err, fd, r, is_dev;
 
-  NEED_ROOT_OR_IS_DEVICE (filename, -1);
-
-  is_dev = strncmp (filename, "/dev/", 5) == 0;
+  is_dev = STRPREFIX (filename, "/dev/");
 
   if (!is_dev) CHROOT_IN;
   fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
   if (!is_dev) CHROOT_OUT;
   if (fd == -1) {
     err = errno;
-    cancel_receive ();
+    r = cancel_receive ();
     errno = err;
-    reply_with_perror ("%s", filename);
+    if (r != -2) reply_with_perror ("%s", filename);
     return -1;
   }
 
   r = receive_file (write_cb, &fd);
   if (r == -1) {               /* write error */
     err = errno;
-    cancel_receive ();
+    r = cancel_receive ();
     errno = err;
-    reply_with_perror ("write: %s", filename);
+    if (r != -2) reply_with_error ("write error: %s", filename);
+    close (fd);
     return -1;
   }
   if (r == -2) {               /* cancellation from library */
@@ -71,9 +70,11 @@ do_upload (const char *filename)
 
   if (close (fd) == -1) {
     err = errno;
-    cancel_receive ();
+    if (r == -1)                /* if r == 0, file transfer ended already */
+      r = cancel_receive ();
     errno = err;
-    reply_with_perror ("close: %s", filename);
+    if (r != -2)
+      reply_with_perror ("close: %s", filename);
     return -1;
   }
 
@@ -87,9 +88,7 @@ do_download (const char *filename)
   int fd, r, is_dev;
   char buf[GUESTFS_MAX_CHUNK_SIZE];
 
-  NEED_ROOT_OR_IS_DEVICE (filename, -1);
-
-  is_dev = strncmp (filename, "/dev/", 5) == 0;
+  is_dev = STRPREFIX (filename, "/dev/");
 
   if (!is_dev) CHROOT_IN;
   fd = open (filename, O_RDONLY);
@@ -106,13 +105,16 @@ do_download (const char *filename)
   reply (NULL, NULL);
 
   while ((r = read (fd, buf, sizeof buf)) > 0) {
-    if (send_file_write (buf, r) < 0)
+    if (send_file_write (buf, r) < 0) {
+      close (fd);
       return -1;
+    }
   }
 
   if (r == -1) {
     perror (filename);
     send_file_end (1);         /* Cancel. */
+    close (fd);
     return -1;
   }
 
@@ -122,6 +124,8 @@ do_download (const char *filename)
     return -1;
   }
 
-  send_file_end (0);           /* Normal end of file. */
+  if (send_file_end (0))       /* Normal end of file. */
+    return -1;
+
   return 0;
 }