From 1c74d1d740d16d2ede335693052b52342717b5d8 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Sun, 28 Dec 2008 03:29:31 +0100
Subject: [PATCH] Add helpers for ifup and ifdown

---
 plugins/inet.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 plugins/inet.h |  3 +++
 2 files changed, 85 insertions(+)

diff --git a/plugins/inet.c b/plugins/inet.c
index ab0fcdc..e3fedfb 100644
--- a/plugins/inet.c
+++ b/plugins/inet.c
@@ -105,3 +105,85 @@ char *inet_index2ident(int index, const char *prefix)
 
 	return str;
 }
+
+int inet_ifup(int index)
+{
+	struct ifreq ifr;
+	int sk, err;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0)
+		return -errno;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_ifindex = index;
+
+	if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	if (ifr.ifr_flags & IFF_UP) {
+		err = -EALREADY;
+		goto done;
+	}
+
+	ifr.ifr_flags |= IFF_UP;
+
+	if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	err = 0;
+
+done:
+	close(sk);
+
+	return err;
+}
+
+int inet_ifdown(int index)
+{
+	struct ifreq ifr;
+	int sk, err;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0)
+		return -errno;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_ifindex = index;
+
+	if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	if (!(ifr.ifr_flags & IFF_UP)) {
+		err = -EALREADY;
+		goto done;
+	}
+
+	ifr.ifr_flags &= ~IFF_UP;
+
+	if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0)
+		err = -errno;
+	else
+		err = 0;
+
+done:
+	close(sk);
+
+	return err;
+}
diff --git a/plugins/inet.h b/plugins/inet.h
index afa8025..3246cc1 100644
--- a/plugins/inet.h
+++ b/plugins/inet.h
@@ -21,3 +21,6 @@
 
 char *inet_index2name(int index);
 char *inet_index2ident(int index, const char *prefix);
+
+int inet_ifup(int index);
+int inet_ifdown(int index);
-- 
2.7.4