From: Hans Dedecker <dedeckeh@gmail.com>
Date: Thu, 26 Jan 2017 14:23:36 +0000 (+0100)
Subject: odhcpd: extra syslog tracing
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=commitdiff_plain;h=44965f14d7abed2d5327ca1c89e4bcf481473e53

odhcpd: extra syslog tracing

Add extra syslog tracing for trouble shooting
and make some syslog traces more self explaining

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---

diff --git a/src/odhcpd.c b/src/odhcpd.c
index e83a700..6a3ba86 100644
--- 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)
diff --git a/src/router.c b/src/router.c
index c410a9c..37ba14f 100644
--- a/src/router.c
+++ b/src/router.c
@@ -263,8 +263,8 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
 		else if (parse_routes(addrs, ipcnt))
 			adv.h.nd_ra_router_lifetime = htons(1);
 
-		syslog(LOG_INFO, "Initial router lifetime %d, %d address(es) available",
-				ntohs(adv.h.nd_ra_router_lifetime), (int)ipcnt);
+		syslog(LOG_INFO, "Initial RA router lifetime %d, %d address(es) available on %s",
+				ntohs(adv.h.nd_ra_router_lifetime), (int)ipcnt, iface->ifname);
 	}
 
 	// Construct Prefix Information options
@@ -282,8 +282,8 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
 			char namebuf[INET6_ADDRSTRLEN];
 
 			inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
-			syslog(LOG_INFO, "Address %s (prefix %d, valid %u) not suitable",
-					namebuf, addr->prefix, addr->valid);
+			syslog(LOG_INFO, "Address %s (prefix %d, valid %u) not suitable as RA prefix on %s",
+					namebuf, addr->prefix, addr->valid, iface->ifname);
 			continue;
 		}
 
@@ -314,7 +314,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
 				&& ntohs(adv.h.nd_ra_router_lifetime) < this_lifetime) {
 			adv.h.nd_ra_router_lifetime = htons(this_lifetime);
 
-			syslog(LOG_DEBUG, "Updating router lifetime to %d", this_lifetime);
+			syslog(LOG_INFO, "Updating RA router lifetime to %d on %s", this_lifetime, iface->ifname);
 		}
 
 		odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr,