Re: [PATCH libmnl] examples: add arp cache dump example

[Pablo Neira Ayuso]

On Thu, May 17, 2018 at 03:10:34PM +0200, Laura Garcia Liebana wrote:
> Adding ARP example in order to dump the info in the form:
> 
> index= family= dst= lladdr= 
> state=

Applied, thanks Laura.

BTW, before applying, I have renamed this to rtnl-neigh-dump instead.
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH libmnl] examples: add arp cache dump example

[Laura Garcia Liebana]

Adding ARP example in order to dump the info in the form:

index= family= dst= lladdr= 
state=

Signed-off-by: Laura Garcia Liebana 
---
 examples/rtnl/Makefile.am |   6 +-
 examples/rtnl/rtnl-arp-dump.c | 161 ++
 2 files changed, 166 insertions(+), 1 deletion(-)
 create mode 100644 examples/rtnl/rtnl-arp-dump.c

diff --git a/examples/rtnl/Makefile.am b/examples/rtnl/Makefile.am
index 24769b6..e56365c 100644
--- a/examples/rtnl/Makefile.am
+++ b/examples/rtnl/Makefile.am
@@ -6,7 +6,8 @@ check_PROGRAMS = rtnl-addr-dump \
 rtnl-link-set \
 rtnl-route-add \
 rtnl-route-dump \
-rtnl-route-event
+rtnl-route-event \
+rtnl-arp-dump
 
 rtnl_addr_dump_SOURCES = rtnl-addr-dump.c
 rtnl_addr_dump_LDADD = ../../src/libmnl.la
@@ -34,3 +35,6 @@ rtnl_route_dump_LDADD = ../../src/libmnl.la
 
 rtnl_route_event_SOURCES = rtnl-route-event.c
 rtnl_route_event_LDADD = ../../src/libmnl.la
+
+rtnl_arp_dump_SOURCES = rtnl-arp-dump.c
+rtnl_arp_dump_LDADD = ../../src/libmnl.la
diff --git a/examples/rtnl/rtnl-arp-dump.c b/examples/rtnl/rtnl-arp-dump.c
new file mode 100644
index 000..fc0f205
--- /dev/null
+++ b/examples/rtnl/rtnl-arp-dump.c
@@ -0,0 +1,161 @@
+/* This example is placed in the public domain. */
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+#include 
+
+static int data_attr_cb(const struct nlattr *attr, void *data)
+{
+   const struct nlattr **tb = data;
+   int type = mnl_attr_get_type(attr);
+
+   /* skip unsupported attribute in user-space */
+   if (mnl_attr_type_valid(attr, IFA_MAX) < 0)
+   return MNL_CB_OK;
+
+   switch(type) {
+   case NDA_DST:
+   if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
+   perror("mnl_attr_validate");
+   return MNL_CB_ERROR;
+   }
+   break;
+   case NDA_LLADDR:
+   if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
+   perror("mnl_attr_validate");
+   return MNL_CB_ERROR;
+   }
+   break;
+   }
+   tb[type] = attr;
+   return MNL_CB_OK;
+}
+
+static int data_cb(const struct nlmsghdr *nlh, void *data)
+{
+   struct nlattr *tb[IFA_MAX + 1] = {};
+   struct ndmsg *ndm = mnl_nlmsg_get_payload(nlh);
+
+   printf("index=%d family=%d ", ndm->ndm_ifindex, ndm->ndm_family);
+
+   mnl_attr_parse(nlh, sizeof(*ndm), data_attr_cb, tb);
+   printf("dst=");
+   if (tb[NDA_DST]) {
+   void *addr = mnl_attr_get_payload(tb[NDA_DST]);
+   char out[INET6_ADDRSTRLEN];
+
+   if (inet_ntop(ndm->ndm_family, addr, out, sizeof(out)))
+   printf("%s ", out);
+   }
+
+   mnl_attr_parse(nlh, sizeof(*ndm), data_attr_cb, tb);
+   printf("lladdr=");
+   if (tb[NDA_LLADDR]) {
+   void *addr = mnl_attr_get_payload(tb[NDA_LLADDR]);
+   unsigned char lladdr[6] = {0};
+
+   if (memcpy(, addr, 6))
+   printf("%02x:%02x:%02x:%02x:%02x:%02x ", lladdr[0], 
lladdr[1], lladdr[2], lladdr[3], lladdr[4], lladdr[5]);
+   }
+
+   printf("state=");
+   switch(ndm->ndm_state) {
+   case NUD_INCOMPLETE:
+   printf("incomplete ");
+   break;
+   case NUD_REACHABLE:
+   printf("reachable ");
+   break;
+   case NUD_STALE:
+   printf("stale ");
+   break;
+   case NUD_DELAY:
+   printf("delay ");
+   break;
+   case NUD_PROBE:
+   printf("probe ");
+   break;
+   case NUD_FAILED:
+   printf("failed ");
+   break;
+   case NUD_NOARP:
+   printf("noarp ");
+   break;
+   case NUD_PERMANENT:
+   printf("permanent ");
+   break;
+   default:
+   printf("%d ", ndm->ndm_state);
+   break;
+   }
+
+   printf("\n");
+   return MNL_CB_OK;
+}
+
+int main(int argc, char *argv[])
+{
+   struct mnl_socket *nl;
+   char buf[MNL_SOCKET_BUFFER_SIZE];
+   struct nlmsghdr *nlh;
+   struct rtgenmsg *rt;
+   int ret;
+   unsigned int seq, portid;
+
+   if (argc != 2) {
+   fprintf(stderr, "Usage: %s \n", argv[0]);
+   exit(EXIT_FAILURE);
+   }
+
+   nlh = mnl_nlmsg_put_header(buf);
+   nlh->nlmsg_type = RTM_GETNEIGH;
+   nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+   nlh->nlmsg_seq = seq = time(NULL);
+
+   rt = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg));
+   if (strcmp(argv[1], "inet") == 0)
+   rt->rtgen_family = AF_INET;
+   else if (strcmp(argv[1], "inet6") == 0)
+