I found it was caused by a struct from the kernel's netlink code being
copied into a char buffer causing it to be unaligned.
I have attached a fix.
-- William
--- old/ipsec-tools-0.6.6/src/racoon/grabmyaddr.c 2007-07-25 17:42:41.000000000 -0700
+++ new/ipsec-tools-0.6.6/src/racoon/grabmyaddr.c 2007-07-25 18:06:08.000000000 -0700
@@ -124,16 +124,23 @@
static void recvaddrs(int fd, struct ifaddrs **ifa, __u32 seq)
{
- char buf[8192];
+#define NL_BUFFER_SIZE NLMSG_SPACE(8192)
+ struct nlmsghdr *nlh = NULL;
struct sockaddr_nl nladdr;
- struct iovec iov = { buf, sizeof(buf) };
+ struct iovec iov;
struct ifaddrmsg *m;
struct rtattr * rta_tb[IFA_MAX+1];
struct ifaddrs *I;
+ nlh = (struct nlmsghdr*)malloc(NL_BUFFER_SIZE);
+ memset(nlh, 0, NL_BUFFER_SIZE);
+
+ iov.iov_base = (void*)nlh;
+ iov.iov_len = NL_BUFFER_SIZE;
+
while (1) {
int status;
- struct nlmsghdr *h;
+ struct nlmsghdr *h = nlh;
struct msghdr msg = {
(void*)&nladdr, sizeof(nladdr),
@@ -153,7 +160,6 @@
if (nladdr.nl_pid) /* Message not from kernel */
continue;
- h = (struct nlmsghdr*)buf;
while (NLMSG_OK(h, status)) {
if (h->nlmsg_seq != seq)
goto skip_it;
@@ -210,6 +216,7 @@
if (msg.msg_flags & MSG_TRUNC)
continue;
}
+ free(nlh);
return;
}
