'len' should be an unsigned 32 bit int.

[libguestfs.git] / daemon / proto.c

diff --git a/daemon/proto.c b/daemon/proto.c
index 39cee5a..431f219 100644 (file)
--- a/daemon/proto.c
+++ b/daemon/proto.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
@@ -45,7 +45,7 @@ main_loop (int _sock)
   XDR xdr;
   char *buf;
   char lenbuf[4];
-  unsigned len;
+  uint32_t len;
   struct guestfs_message_header hdr;
   struct timeval start_t, end_t;
   int64_t start_us, end_us, elapsed_us;
@@ -69,7 +69,7 @@ main_loop (int _sock)
 
     if (len > GUESTFS_MESSAGE_MAX) {
       fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
-              len);
+               len);
       exit (1);
     }
 
@@ -86,20 +86,20 @@ main_loop (int _sock)
       int i, j;
 
       for (i = 0; i < len; i += 16) {
-       printf ("%04x: ", i);
-       for (j = i; j < MIN (i+16, len); ++j)
-         printf ("%02x ", (unsigned char) buf[j]);
-       for (; j < i+16; ++j)
-         printf ("   ");
-       printf ("|");
-       for (j = i; j < MIN (i+16, len); ++j)
-         if (isprint (buf[j]))
-           printf ("%c", buf[j]);
-         else
-           printf (".");
-       for (; j < i+16; ++j)
-         printf (" ");
-       printf ("|\n");
+        printf ("%04x: ", i);
+        for (j = i; j < MIN (i+16, len); ++j)
+          printf ("%02x ", (unsigned char) buf[j]);
+        for (; j < i+16; ++j)
+          printf ("   ");
+        printf ("|");
+        for (j = i; j < MIN (i+16, len); ++j)
+          if (isprint (buf[j]))
+            printf ("%c", buf[j]);
+          else
+            printf (".");
+        for (; j < i+16; ++j)
+          printf (" ");
+        printf ("|\n");
       }
     }
 #endif
@@ -146,10 +146,12 @@ main_loop (int _sock)
       start_us = (int64_t) start_t.tv_sec * 1000000 + start_t.tv_usec;
       end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec;
       elapsed_us = end_us - start_us;
-      fprintf (stderr, "proc %d serial %d took %d.%02d seconds\n",
-              proc_nr, serial,
-              (int) (elapsed_us / 1000000),
-              (int) ((elapsed_us / 10000) % 100));
+      fprintf (stderr, "proc %d (%s) took %d.%02d seconds\n",
+               proc_nr,
+               proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS
+               ? function_names[proc_nr] : "UNKNOWN PROCEDURE",
+               (int) (elapsed_us / 1000000),
+               (int) ((elapsed_us / 10000) % 100));
     }
 
   cont:
@@ -264,9 +266,14 @@ reply (xdrproc_t xdrp, char *ret)
   }
 
   if (xdrp) {
+    /* This can fail if the reply body is too large, for example
+     * if it exceeds the maximum message size.  In that case
+     * we want to return an error message instead. (RHBZ#509597).
+     */
     if (!(*xdrp) (&xdr, ret)) {
-      fprintf (stderr, "guestfsd: failed to encode reply body\n");
-      exit (1);
+      reply_with_perror ("guestfsd: failed to encode reply body\n");
+      xdr_destroy (&xdr);
+      return;
     }
   }
 
@@ -281,7 +288,7 @@ reply (xdrproc_t xdrp, char *ret)
     fprintf (stderr, "xwrite failed\n");
     exit (1);
   }
-  if (xwrite (sock, buf, len) == len) {
+  if (xwrite (sock, buf, len) == -1) {
     fprintf (stderr, "xwrite failed\n");
     exit (1);
   }
@@ -310,7 +317,7 @@ receive_file (receive_cb cb, void *opaque)
 
     if (len > GUESTFS_MESSAGE_MAX) {
       fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
-              len);
+               len);
       exit (1);
     }
 
@@ -334,7 +341,7 @@ receive_file (receive_cb cb, void *opaque)
 
     if (verbose)
       printf ("receive_file: got chunk: cancel = %d, len = %d, buf = %p\n",
-             chunk.cancel, chunk.data.data_len, chunk.data.data_val);
+              chunk.cancel, chunk.data.data_len, chunk.data.data_val);
 
     if (chunk.cancel) {
       fprintf (stderr, "receive_file: received cancellation from library\n");
@@ -390,7 +397,7 @@ send_file_write (const void *buf, int len)
 
   if (len > GUESTFS_MAX_CHUNK_SIZE) {
     fprintf (stderr, "send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n",
-            len, GUESTFS_MAX_CHUNK_SIZE);
+             len, GUESTFS_MAX_CHUNK_SIZE);
     return -1;
   }
 
@@ -448,14 +455,14 @@ check_for_library_cancellation (void)
 
   if (flag != GUESTFS_CANCEL_FLAG) {
     fprintf (stderr, "check_for_library_cancellation: read 0x%x from library, expected 0x%x\n",
-            flag, GUESTFS_CANCEL_FLAG);
+             flag, GUESTFS_CANCEL_FLAG);
     return 0;
   }
 
   return 1;
 }
 
-void
+int
 send_file_end (int cancel)
 {
   guestfs_chunk chunk;
@@ -463,7 +470,7 @@ send_file_end (int cancel)
   chunk.cancel = cancel;
   chunk.data.data_len = 0;
   chunk.data.data_val = NULL;
-  send_chunk (&chunk);
+  return send_chunk (&chunk);
 }
 
 static int
@@ -488,8 +495,12 @@ send_chunk (const guestfs_chunk *chunk)
   xdr_uint32_t (&xdr, &len);
   xdr_destroy (&xdr);
 
-  (void) xwrite (sock, lenbuf, 4);
-  (void) xwrite (sock, buf, len);
+  int err = (xwrite (sock, lenbuf, 4) == 0
+             && xwrite (sock, buf, len) == 0 ? 0 : -1);
+  if (err) {
+    fprintf (stderr, "send_chunk: write failed\n");
+    exit (1);
+  }
 
-  return 0;
+  return err;
 }