# Re: seg-faults for network access

From: Jochen Eisinger (jochen.eisinger@gno.de)
Date: Sun Dec 10 2000 - 05:36:48 PST

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  Hi!

  [Daniel Kerry Hiltgen]
  > Does anyone know if saned and the network protocol is byte order clean,
  > independent of the underlying architecture? (just a hunch...)
  The protocol itself is byte order clean, but not the image date
  transfer...

  > I've got my scanner hooked up to a Sun Sparc (running linux), and I'm
  > trying to access it from an x86 box. Local scans on the sparc seem to
  > work, but it's headless/no X so I really want to use my desktop machine
  > to do real scans.
  Do local scans work or scans over localhost?

  For debugging saned/net use the following:

  Start saned from commandline as

  # export SANE_DEBUG_YOURBACKEND=128
  # saned -d128

  and start scanimage on the other pc as

  $ export SANE_DEBUG_NET=128
  $ scanimage -L

  note that saned also produces output for syslog.

  In your case, I think, saned isn't even accessed by the net backend...
  maybe your client has no access rights on the saned port on your sparc?

  > Here's one stack trace of the seg-fault. (I get roughly the same stack
  > in scanimage -L, xsane, and xscanimage)
  This is always the same... sanei_w_space can't read from the pipe and
  returns. The next call to sanei_w_space generates a sig11... I've
  attached a simple patch, maybe you get a better error-msg with this one.

  > Any thoughts? Can I provide more information that might be helpful in
  > diagnosing the problem? (FWIW: Mustek 1200 LS)

  Could you please try this patch? and if it works (e.g. doesn't segfault
  anymore), please send the output from saned & scanimage... thanks

  BTW. the patch was made against the current cvs tree but it should also
  work with SANE 1.0.3.

  -- jochen

  --- ../sane/sane-backends/sanei/sanei_wire.c Sat Aug 12 17:11:37 2000
  +++ sane-backends/sanei/sanei_wire.c Sun Dec 10 12:38:19 2000
  @@ -56,6 +56,9 @@
  int fd = w->io.fd;
  ssize_t nread, nwritten;
  + if (w->status != 0)
  + return;
  +
  if (w->buffer.curr + howmuch > w->buffer.end)
  {
  switch (w->direction)
  @@ -80,6 +83,8 @@
  case WIRE_DECODE:
  left_over = w->buffer.end - w->buffer.curr;
  + if ((signed) (left_over < 0))
  + return;
  if (left_over)
  memcpy (w->buffer.start, w->buffer.curr, left_over);
  w->buffer.curr = w->buffer.start;

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