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  • From: "Lowden, James K" <james.k.lowden AT alliancebernstein.com>
  • To: "FreeTDS Development Group" <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] Issue connecting to SQL Server from Linux Host with newerversions of FreeTDS...
  • Date: Mon, 27 Nov 2006 18:29:41 -0500

> From: Glenn, Chris
> Sent: Monday, November 27, 2006 9:06 AM
>
> I'm having an issue to connecting from a Red Hat Linux host to a
> SQL Server. I have older copies of FreeTDS that can connect (the
> 'newest' that I have that works is the freetds-0.65.dev.20060224
> build). I have been downloading and trying nightly builds since
> October without any success.
> ...
> net.c:184:Connecting to 10.3.2.40 port 1433 (TDS version 7.0)
> net.c:257:tds_open_socket: 10.3.2.40:1433: Invalid argument

Just last night I was reviewing our networking code in conjunction with
reading Steven's book, and it so happens I was looking at that very
function.

EINVAL is not a nice error code; it says we're not supplying a good
value for some element of the sockaddr_in structure. NetBSD's manpage
doesn't even mention it at as valid errno value for connect(2).

The code itself looks OK, and comparing it to revision 1.14 (Tue Feb 22
16:04:36 2005), most of the changes are to the logging code and adding
support for DOS32. That makes me wonder if it's a matter of configure
perhaps misdetecting your system somehow. I think it was around that
time that we upgraded the toolset that generates the configure script.

I added yet more logging code, cf. patch below. With it, your log file
should now dump the sockaddr_in structure. You can verify that, say,
sin_family really is AF_INET according to your system's header files.

I'm not sure we should leave this code in; it won't compile under Win32,
for instance. But it will be in the next snapshot, and maybe it will
help solve your problem.

--jkl


== snip ==
Index: src/tds/net.c
===================================================================
RCS file: /cvsroot/freetds/freetds/src/tds/net.c,v
retrieving revision 1.46
diff -u -r1.46 net.c
--- src/tds/net.c 26 Nov 2006 21:00:54 -0000 1.46
+++ src/tds/net.c 27 Nov 2006 22:51:34 -0000
@@ -235,6 +235,23 @@
retval = connect(tds->s, (struct sockaddr *) &sin, sizeof(sin));
if (retval == 0) {
tdsdump_log(TDS_DBG_INFO2, "connection established\n");
+ } else {
+ tdsdump_log(TDS_DBG_ERROR, "error: connect(2) returned
0x%x, \"%s\"\n", sock_errno, strerror(sock_errno));
+ if (sock_errno != ECONNREFUSED && sock_errno !=
ENETUNREACH) {
+ tdsdump_dump_buf(TDS_DBG_ERROR, "Contents of
sockaddr_in", &sin, sizeof(sin));
+ tdsdump_log(TDS_DBG_ERROR, "
sockaddr_in:\t"
+ "%s =
%x\n"
+ "\t\t\t%s =
%x\n"
+ "\t\t\t%s =
%x\n"
+ "\t\t\t%s =
%x\n"
+ "\t\t\t%s =
'%s'\n"
+ , "sin_len",
sin.sin_len
+ , "sin_family",
sin.sin_family
+ , "sin_port",
sin.sin_port
+ ,
"sin_addr.s_addr", sin.sin_addr.s_addr
+ , "(param
ip_addr)", ip_addr
+ );
+ }
}
if (retval < 0 && sock_errno == TDSSOCK_EINPROGRESS)
retval = 0;
== snip ==

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  • Re: [freetds] Issue connecting to SQL Server from Linux Host with newerversions of FreeTDS..., Lowden, James K, 11/27/2006

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