#include <net/if.h>
#include <netinet/ip6.h>
#include <netpacket/packet.h>
+#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
{
openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
int opt;
- int log_level = LOG_WARNING;
+ int log_level = LOG_INFO;
while ((opt = getopt(argc, argv, "hl:")) != -1) {
switch (opt) {
case 'h':
struct ifaddrmsg ifa;
} req = {{sizeof(req), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
++rtnl_seq, 0}, {AF_INET6, 0, 0, 0, ifindex}};
- if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req))
+ if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req)) {
+ syslog(LOG_WARNING, "Request failed to dump IPv6 addresses (%s)", strerror(errno));
return 0;
+ }
uint8_t buf[8192];
ssize_t len = 0, ret = 0;
if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
if (errno == EINTR)
continue;
- else
- return ret;
+
+ syslog(LOG_WARNING, "Failed to receive IPv6 address rtnetlink message (%s)", strerror(errno));
+ ret = -1;
+ goto out;
}
}
- if (nhm->nlmsg_type != RTM_NEWADDR)
- break;
-
- // Skip address but keep clearing socket buffer
- if (ret >= (ssize_t)cnt)
- continue;
+ switch (nhm->nlmsg_type) {
+ case RTM_NEWADDR: {
+ // Skip address but keep clearing socket buffer
+ if (ret >= (ssize_t)cnt)
+ continue;
- struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ifindex && ifa->ifa_index != (unsigned)ifindex))
- continue;
+ struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
+ if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
+ (ifindex && ifa->ifa_index != (unsigned)ifindex))
+ continue;
- struct rtattr *rta = (struct rtattr*)&ifa[1];
- size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa));
- memset(&addrs[ret], 0, sizeof(addrs[ret]));
- addrs[ret].prefix = ifa->ifa_prefixlen;
-
- while (RTA_OK(rta, alen)) {
- if (rta->rta_type == IFA_ADDRESS) {
- memcpy(&addrs[ret].addr, RTA_DATA(rta),
- sizeof(struct in6_addr));
- } else if (rta->rta_type == IFA_CACHEINFO) {
- struct ifa_cacheinfo *ifc = RTA_DATA(rta);
- addrs[ret].preferred = ifc->ifa_prefered;
- addrs[ret].valid = ifc->ifa_valid;
+ struct rtattr *rta = (struct rtattr*)&ifa[1];
+ size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa));
+ memset(&addrs[ret], 0, sizeof(addrs[ret]));
+ addrs[ret].prefix = ifa->ifa_prefixlen;
+
+ while (RTA_OK(rta, alen)) {
+ if (rta->rta_type == IFA_ADDRESS) {
+ memcpy(&addrs[ret].addr, RTA_DATA(rta),
+ sizeof(struct in6_addr));
+ } else if (rta->rta_type == IFA_CACHEINFO) {
+ struct ifa_cacheinfo *ifc = RTA_DATA(rta);
+ addrs[ret].preferred = ifc->ifa_prefered;
+ addrs[ret].valid = ifc->ifa_valid;
+ }
+
+ rta = RTA_NEXT(rta, alen);
}
- rta = RTA_NEXT(rta, alen);
- }
+ if (ifa->ifa_flags & IFA_F_DEPRECATED)
+ addrs[ret].preferred = 0;
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- addrs[ret].preferred = 0;
+ ++ret;
+ break;
+ }
+ case NLMSG_DONE:
+ goto out;
+ default:
+ syslog(LOG_WARNING, "Unexpected rtnetlink message (%d) in response to IPv6 address dump", nhm->nlmsg_type);
+ ret = -1;
+ goto out;
+ }
- ++ret;
}
-
+out:
return ret;
}