1 files changed, 37 insertions, 0 deletions
diff --git a/libbb/create_icmp_socket.c b/libbb/create_icmp_socket.c
new file mode 100644
index 000000000..431c4d8a7
--- /dev/null
+++ b/libbb/create_icmp_socket.c
@@ -0,0 +1,37 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * create raw socket for icmp protocol test permission
+ * and drop root privileges if running setuid
+ *
+ */
+
+#include <sys/types.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libbb.h"
+
+int create_icmp_socket(void)
+{
+	struct protoent *proto;
+	int sock;
+
+	proto = getprotobyname("icmp");
+	/* if getprotobyname failed, just silently force
+	 * proto->p_proto to have the correct value for "icmp" */
+	if ((sock = socket(AF_INET, SOCK_RAW,
+			(proto ? proto->p_proto : 1))) < 0) {        /* 1 == ICMP */
+		if (errno == EPERM)
+			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+		else
+			bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
+	}
+
+	/* drop root privs if running setuid */
+	xsetuid(getuid());
+
+	return sock;
+}