static void netsnmp_access_arp_read_netlink(int fd, void *data)
{
netsnmp_arp_access *access = (netsnmp_arp_access *) data;
netsnmp_arp_entry *entry;
char buf[16384];
struct nlmsghdr *h;
int r, len;
do {
r = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
if (r < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN)
return;
snmp_log(LOG_WARNING, "netlink buffer overrun\n");
access->synchronized = 0;
if (access->cache_expired != NULL)
*access->cache_expired = 1;
return;
}
} while (0);
len = r;
for (h = (struct nlmsghdr *) buf; NLMSG_OK(h, len); h = NLMSG_NEXT(h, len)) {
if (h->nlmsg_type == NLMSG_DONE) {
access->synchronized = 1;
continue;
}
entry = netsnmp_access_arp_entry_create();
if (NULL == entry)
break;
DEBUGMSGTL(("access:netlink:arp", "arp netlink notification\n"));
entry->generation = access->generation;
r = fillup_entry_info (entry, h);
if (r > 0) {
access->update_hook(access, entry);
} else {
if (r < 0) {
NETSNMP_LOGONCE((LOG_ERR, "filling entry info failed\n"));
DEBUGMSGTL(("access:netlink:arp", "filling entry info failed\n"));
}
netsnmp_access_arp_entry_free(entry);
}
}
}
static int
_load_v6(netsnmp_container *container, int idx_offset)
{
char buffer[16384];
#if defined(HAVE_LINUX_RTNETLINK_H)
struct nlmsghdr *nlmp;
#endif
int sd = 0;
int status = 0;
int rc = 0;
int len, req_len;
netsnmp_arp_entry *entry;
netsnmp_assert(NULL != container);
#if defined(HAVE_LINUX_RTNETLINK_H)
if((sd = socket (PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
snmp_log(LOG_ERR,"Unable to create netlink socket\n");
return -2;
}
if(get_translation_table_info (sd, &status, buffer, sizeof(buffer)) < 0) {
snmp_log(LOG_ERR,"Unable to fetch translation table info\n");
close(sd);
return -2;
}
for (nlmp = (struct nlmsghdr *)buffer; status > sizeof(*nlmp); ) {
len = nlmp->nlmsg_len;
req_len = len - sizeof(*nlmp);
if (req_len < 0 || len > status) {
snmp_log(LOG_ERR,"invalid length\n");
return -2;
}
if (!NLMSG_OK (nlmp, status)) {
snmp_log(LOG_ERR,"NLMSG not OK\n");
return -2;
}
entry = netsnmp_access_arp_entry_create();
if(NULL == entry) {
rc = -3;
break;
}
entry->ns_arp_index = ++idx_offset;
if(fillup_entry_info (entry, nlmp) < 0) {
DEBUGMSGTL(("access:arp:load_v6", "skipping netlink message that"
" did not contain valid ARP information\n"));
netsnmp_access_arp_entry_free(entry);
status -= NLMSG_ALIGN(len);
nlmp = (struct nlmsghdr*)((char*)nlmp + NLMSG_ALIGN(len));
continue;
}
CONTAINER_INSERT(container, entry);
status -= NLMSG_ALIGN(len);
nlmp = (struct nlmsghdr*)((char*)nlmp + NLMSG_ALIGN(len));
}
close(sd);
#endif
if(rc<0) {
return rc;
}
return idx_offset;
}
