1 files changed, 79 insertions, 0 deletions
diff --git a/kexec/ifdown.c b/kexec/ifdown.c
new file mode 100644
index 0000000..3ac19c1
--- /dev/null
+++ b/kexec/ifdown.c
@@ -0,0 +1,79 @@
+/*
+ * ifdown.c Find all network interfaces on the system and
+ *      shut them down.
+ *
+ */
+char *v_ifdown = "@(#)ifdown.c  1.11  02-Jun-1998  miquels@cistron.nl";
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+#include <errno.h>
+
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+
+/*
+ *  First, we find all shaper devices and down them. Then we
+ *  down all real interfaces. This is because the comment in the
+ *  shaper driver says "if you down the shaper device before the
+ *  attached inerface your computer will follow".
+ */
+int ifdown(void)
+{
+	struct if_nameindex *ifa, *ifp;
+	struct ifreq ifr;
+	int fd, shaper;
+
+	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+		fprintf(stderr, "ifdown: ");
+		perror("socket");
+		goto error;
+	}
+
+	if ((ifa = if_nameindex()) == NULL) {
+		fprintf(stderr, "ifdown: ");
+		perror("if_nameindex");
+		goto error;
+	}
+
+	for (shaper = 1; shaper >= 0; shaper--) {
+		for (ifp = ifa; ifp->if_index; ifp++) {
+
+			if ((strncmp(ifp->if_name, "shaper", 6) == 0)
+			    != shaper) continue;
+			if (strcmp(ifp->if_name, "lo") == 0)
+				continue;
+			if (strchr(ifp->if_name, ':') != NULL)
+				continue;
+
+			strncpy(ifr.ifr_name, ifp->if_name, IFNAMSIZ-1);
+			ifr.ifr_name[IFNAMSIZ-1] = 0;
+			if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
+				fprintf(stderr, "ifdown: shutdown ");
+				perror(ifp->if_name);
+				goto error;
+			}
+			ifr.ifr_flags &= ~(IFF_UP);
+			if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
+				fprintf(stderr, "ifdown: shutdown ");
+				perror(ifp->if_name);
+				goto error;
+			}
+
+		}
+	}
+
+	close(fd);
+	return 0;
+
+error:
+	close(fd);
+	return -1;
+}