In case if some diag module is not present in the system, say the kernel is not modern enough, we simply skip the error code reported. Instead we should check for data length in NLMSG_DONE and process unsupported case.
Signed-off-by: Cyrill Gorcunov <gorcu...@gmail.com>
---
lib/libnetlink.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 2279935..232daee 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -312,6 +312,22 @@ int rtnl_dump_filter_l(struct rtnl_handle *rth,
dump_intr = 1;
if (h->nlmsg_type == NLMSG_DONE) {
+ if (rth->proto == NETLINK_SOCK_DIAG) {
+ if (h->nlmsg_len <
NLMSG_LENGTH(sizeof(int))) {
+ fprintf(stderr, "DONE
truncated\n");
+ return -1;
+ } else {
+ int len = *(int
*)NLMSG_DATA(h);
+ if (len < 0) {
+ errno = -len;
+ if (errno ==
ENOENT ||
+ errno ==
EOPNOTSUPP)
+ return
-1;
+
perror("RTNETLINK answers");
+ return len;
+ }
+ }
+ }
found_done = 1;
break; /* process next filter */
}
--
2.7.4
