From 6751366d75406726fb533f842fd59b69feb95292 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Sat, 6 Dec 2008 00:27:49 +0100
Subject: [PATCH] Set loopback interface parameters during setup

---
 plugins/loopback.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 1 deletion(-)

diff --git a/plugins/loopback.c b/plugins/loopback.c
index 255d2bf..184ea73 100644
--- a/plugins/loopback.c
+++ b/plugins/loopback.c
@@ -23,11 +23,81 @@
 #include <config.h>
 #endif
 
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+
 #include <connman/plugin.h>
+#include <connman/log.h>
 
 static int loopback_init(void)
 {
-	return 0;
+	struct ifreq ifr;
+	struct sockaddr_in *addr;
+	int sk, err;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0)
+		return -1;
+
+	memset(&ifr, 0, sizeof(ifr));
+	strcpy(ifr.ifr_name, "lo");
+
+	if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	if (ifr.ifr_flags & IFF_UP) {
+		err = -EALREADY;
+		connman_info("The loopback interface is already up");
+		goto done;
+	}
+
+	addr = (struct sockaddr_in *) &ifr.ifr_addr;
+	addr->sin_family = AF_INET;
+	addr->sin_addr.s_addr = inet_addr("127.0.0.0");
+
+	err = ioctl(sk, SIOCSIFADDR, &ifr);
+	if (err < 0) {
+		err = -errno;
+		connman_error("Setting address failed (%s)", strerror(-err));
+		goto done;
+	}
+
+	addr = (struct sockaddr_in *) &ifr.ifr_netmask;
+	addr->sin_family = AF_INET;
+	addr->sin_addr.s_addr = inet_addr("255.0.0.0");
+
+	err = ioctl(sk, SIOCSIFNETMASK, &ifr);
+	if (err < 0) {
+		err = -errno;
+		connman_error("Setting netmask failed (%s)", strerror(-err));
+		goto done;
+	}
+
+	if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		goto done;
+	}
+
+	ifr.ifr_flags |= IFF_UP;
+
+	if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0) {
+		err = -errno;
+		connman_error("Activating loopback interface failed (%s)",
+							strerror(-err));
+		goto done;
+	}
+
+done:
+	close(sk);
+
+	return err;
 }
 
 static void loopback_exit(void)
-- 
2.7.4