Re: 7.4devel auth failed - Mailing list pgsql-hackers

I am confused about using only the last few bytes.  Does this
adjustment of IP addresses help:voidconvSockAddr6to4(const SockAddr *src, SockAddr *dst){    char
addr_str[INET6_ADDRSTRLEN];   dst->in.sin_family = AF_INET;    dst->in.sin_port = src->in6.sin6_port;
dst->in.sin_addr.s_addr=        (src->in6.sin6_addr.s6_addr[15])        + (src->in6.sin6_addr.s6_addr[14] << 8)
+(src->in6.sin6_addr.s6_addr[13] << 16)        + (src->in6.sin6_addr.s6_addr[12] << 24);    SockAddr_ntop(src,
addr_str,INET6_ADDRSTRLEN, 0);}
 

Can you supply a patch?

FYI, I do have IPv6 enabled libraries, but not in my kernel.

> PS Your mail host candle.pha.pa.us rejected this mail as spam?!?

I have whitelisted web.de.  I received spam from them last month, and
didn't know if they were legit or just a spamhouse.  Unfortunately, I
don't check each one I blacklist.

---------------------------------------------------------------------------

Andreas Pflug wrote:
> Ok Bruce,
> 
> I found out what's happening.
> I'm running a Suse 8.1 2.4.19 standard kernel which has IPV6 enabled by 
> default. When connecting locally over IP (pgaccess), hba is checked 
> against IPV6 patterns in pg_hba.conf.
> My pgadmin2 machine will connect with an IP4-to-6 mapped address of 
> 0:ffff:c0a80002 (192.168.0.2), which convSockAddr6to4 will convert to 
> dst->in.sin_addr.s_addr=0xc0a80002. On the other side, SockAddr_pton 
> will convert my 192.168.0.0/255.255.255.0 entry to a8c0/ffffff, and 
> consequently rangeSockAddr will fail.
> 
> If your kernel isn't V6 enabled, the incoming socket will be AF_INET, 
> and no conversion is done, that's why you don't get the problem.
> To fix this, the [12]..[15] indices need to be reversed (for Intel). 
> This might be machine specific... Maybe for all big-endian machines the 
> current code is ok, and needs reversal for little-endian processors.
> I wonder if the following is completely portable, could be:
> dst->in.sin_addr.s_addr = *(in_addr_t*)(src->in4.sin6_addr.s6_addr+12);
> 
> Regards,
> Andreas
> 
> PS Your mail host candle.pha.pa.us rejected this mail as spam?!?
> 
> 
> 
> Bruce Momjian wrote:
> 
> >That's strange.  I just tested it here, and it worked.  I have IPv6 code
> >enabled. but no IPv6 in my kernel, so there are just IPv4 connections.
> >
> >Can you peek in this funciton and see where it is failing:
> >    
> >    int
> >    rangeSockAddrAF_INET(const SockAddr *addr, const SockAddr *netaddr,
> >                         const SockAddr *netmask)
> >    {
> >        if (addr->sa.sa_family != AF_INET ||
> >            netaddr->sa.sa_family != AF_INET ||
> >            netmask->sa.sa_family != AF_INET)
> >            return 0;
> >        if (((addr->in.sin_addr.s_addr ^ netaddr->in.sin_addr.s_addr) &
> >             netmask->in.sin_addr.s_addr) == 0)
> >            return 1;
> >        else
> >            return 0;
> >    }       
> >
> >That is the IPv4 function.
> >        
> >
> >  
> >
> 
> 
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--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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