From ecbe5220c5d8c7f9f2b26e8810a07198b23ca166 Mon Sep 17 00:00:00 2001
From: Sapan Bhatia <gwsapan@gmail.com>
Date: Mon, 3 Oct 2011 11:59:52 -0400
Subject: [PATCH] Adding fd_nelink: a script for slices to read the nodes
 packet headers

---
 fd_netlink.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 fd_netlink.c

diff --git a/fd_netlink.c b/fd_netlink.c
new file mode 100644
index 0000000..4dc4ff1
--- /dev/null
+++ b/fd_netlink.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <asm/types.h>
+#include <linux/netlink.h>
+
+#include "fdpass.h"
+
+
+static void receive_argument(int control_fd, unsigned int *value)
+{
+	if (recv(control_fd, value, sizeof(unsigned int), 0) != sizeof(unsigned int)) {
+		fprintf(stderr, "receiving argument failed\n");
+		exit(-1);
+	}
+}
+
+int main(int argc, char *argv[]) 
+{
+    int control_channel_fd, magic_socket;
+	struct sockaddr_nl addr;
+	unsigned int pid = 0;
+	unsigned int gmask = 1;
+ 
+    if (argc < 3) {
+        printf("This script is called by vsys.\n");
+        exit(1);
+    }
+
+    control_channel_fd = atoi(argv[2]);  
+
+	/* receive pid paramater */
+	receive_argument(control_channel_fd, &pid);
+
+	/* receive gmask paramater */
+	receive_argument(control_channel_fd, &gmask);
+
+    magic_socket =  receive_fd(control_channel_fd);
+    if (magic_socket == -1) { 
+        fprintf(stderr, "Error creating socket: %d\n", errno);
+        exit(1);
+    }
+
+	memset(&addr, 0, sizeof(struct sockaddr_nl));
+	addr.nl_family = AF_NETLINK;
+	addr.nl_pid = pid;
+	addr.nl_groups = gmask;
+	if (bind(magic_socket, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+		fprintf(stderr, "Error calling bind for AF_NETLINK: %d\n", errno);
+		exit(1);
+	}
+
+    send_fd(control_channel_fd, magic_socket);
+}
-- 
2.43.0