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2004-12-29 Greg Troxel <gdt@poblano.ir.bbn.com>

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* sockopt.c (getsockopt_ipv4_ifindex): Return 0 when passed a NULL
	  cmsghdr pointer.

I believe this will avoid ospfd crashing on Solaris 8, which seems to
define IP_RECVIF but not actually implement it.
This commit is contained in:
gdt 2004-12-29 18:53:30 +00:00
parent 3cade26fea
commit 1d69fdf645
2 changed files with 27 additions and 0 deletions
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5
lib/ChangeLog
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@ -1,3 +1,8 @@
2004-12-29 Greg Troxel <gdt@poblano.ir.bbn.com>
* sockopt.c (getsockopt_ipv4_ifindex): Return 0 when passed a NULL
cmsghdr pointer.
2004-12-28 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* sockopt.c: (setsockopt_ipv4_ifindex) Improve error message.

22
lib/sockopt.c
View File

@ -283,11 +283,30 @@ setsockopt_ifindex (int af, int sock, int val)
static int
getsockopt_ipv4_ifindex (struct msghdr *msgh)
{
/*
* XXX: This routine's semantics are ill-defined, in particular how
* the results "can't determine interface due to runtime behavior"
* and "OS has no support for how to determine behavior" are
* encoded. For now, return 0 for either case; caller must handle
* as "don't know".
*/
int ifindex = -1;
/*
* If autoconf found a method to get ifindex, but it didn't work for
* this packet, or on this OS, this routine can be entered with a
* NULL cmsghdr pointer. Check msgh before using in each case
* below, rather than here, to avoid having to ifdef twice, once for
* declarations and once for code.
*/
#if defined(IP_PKTINFO)
/* Linux pktinfo based ifindex retrieval */
struct in_pktinfo *pktinfo;
if (msgh == NULL)
return 0;
pktinfo =
(struct in_pktinfo *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_PKTINFO);
ifindex = pktinfo->ipi_ifindex;
@ -300,6 +319,9 @@ getsockopt_ipv4_ifindex (struct msghdr *msgh)
#endif /* SUNOS_5 */
/* SUNOS_5 doesn't need a structure to extract ifindex */
if (msgh == NULL)
return 0;
#ifndef SUNOS_5
sdl =
(struct sockaddr_dl *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);