kael (AT) canada (DOT) com writes:
Hmm, I'm betting you are on a machine where shifting a 32-bit quantity
left 32 bits doesn't reliably give zero. This misbehavior is actually
allowed by the C standard :-( ... but it's certainly caught many a
programmer. Including us. I've applied the attached patch, if you
want to fix it locally --- or you could just avoid the bug by using a
separate all-zeroes mask field, for now.

Thanks for the report!

regards, tom lane

Index: ip.c
================================================== =================
RCS file: /cvsroot/pgsql/src/backend/libpq/ip.c,v
retrieving revision 1.23.2.1
diff -c -r1.23.2.1 ip.c
*** ip.c 24 Apr 2004 20:10:47 -0000 1.23.2.1
--- ip.c 8 Nov 2004 01:45:01 -0000
***************
*** 344,380 ****
{
long bits;
char *endptr;
- struct sockaddr_in mask4;
-
- #ifdef HAVE_IPV6
- struct sockaddr_in6 mask6;
- #endif

bits = strtol(numbits, &endptr, 10);

if (*numbits == '\0' || *endptr != '\0')
return -1;

- if ((bits < 0) || (family == AF_INET && bits > 32)
- #ifdef HAVE_IPV6
- || (family == AF_INET6 && bits > 128)
- #endif
- )
- return -1;
-
switch (family)
{
case AF_INET:
! mask4.sin_addr.s_addr =
! htonl((0xffffffffUL << (32 - bits))
! & 0xffffffffUL);
! memcpy(mask, &mask4, sizeof(mask4));
! break;
#ifdef HAVE_IPV6
case AF_INET6:
{
int i;

for (i = 0; i < 16; i++)
{
if (bits <= 0)
--- 344,383 ----
{
long bits;
char *endptr;

bits = strtol(numbits, &endptr, 10);

if (*numbits == '\0' || *endptr != '\0')
return -1;

switch (family)
{
case AF_INET:
! {
! struct sockaddr_in mask4;
! long maskl;
!
! if (bits < 0 || bits > 32)
! return -1;
! /* avoid "x << 32", which is not portable */
! if (bits > 0)
! maskl = (0xffffffffUL << (32 - (int) bits))
! & 0xffffffffUL;
! else
! maskl = 0;
! mask4.sin_addr.s_addr = htonl(maskl);
! memcpy(mask, &mask4, sizeof(mask4));
! break;
! }
!
#ifdef HAVE_IPV6
case AF_INET6:
{
+ struct sockaddr_in6 mask6;
int i;

+ if (bits < 0 || bits > 128)
+ return -1;
for (i = 0; i < 16; i++)
{
if (bits <= 0)
***************
*** 384,390 ****
else
{
mask6.sin6_addr.s6_addr[i] =
! (0xff << (8 - bits)) & 0xff;
}
bits -= 8;
}
--- 387,393 ----
else
{
mask6.sin6_addr.s6_addr[i] =
! (0xff << (8 - (int) bits)) & 0xff;
}
bits -= 8;
}

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