odhcpd: extra syslog tracing

[project/odhcpd.git] / src / odhcpd.c

diff --git a/src/odhcpd.c b/src/odhcpd.c
index e83a700..6a3ba86 100644 (file)
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -219,8 +219,10 @@ ssize_t odhcpd_get_interface_addresses(int ifindex,
                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;
@@ -232,13 +234,16 @@ ssize_t odhcpd_get_interface_addresses(int ifindex,
                        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));
+                               return ret;
                        }
                }
 
-               if (nhm->nlmsg_type != RTM_NEWADDR)
+               if (nhm->nlmsg_type != RTM_NEWADDR) {
+                       syslog(LOG_WARNING, "Unexpected rtnetlink message (%d) in response to IPv6 address dump", nhm->nlmsg_type);
                        break;
+               }
 
                // Skip address but keep clearing socket buffer
                if (ret >= (ssize_t)cnt)