FreeTDS Development Group

["Lowden, James K" <james.k.lowden AT alliancebernstein.com>]

> 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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