Traceroute: use new SIOCGETRT to obtain the source address to be used when

communicating with the destination, patch by Hugo Santos.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20496 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/bin/network/traceroute/Jamfile

@@ -17,7 +17,7 @@ SubDirCcFlags $(defines) ;
 SubDirC++Flags $(defines) ;
 
 BinCommand traceroute :
-	findsaddr-generic.c
+	findsaddr-haiku.c
 	ifaddrlist.c
 	traceroute.c
 	version.c

src/bin/network/traceroute/findsaddr-haiku.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2007, Haiku Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Hugo Santos <hugosantos@gmail.com>
+ */
+
+
+#include <stdint.h>
+#include <unistd.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+
+#include "findsaddr.h"
+	// is not self containing...
+
+
+const char *
+findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
+{
+	uint8_t buffer[256];
+	struct route_entry *request = (struct route_entry *)buffer;
+
+	int sock = socket(AF_INET, SOCK_DGRAM, 0);
+	if (sock < 0)
+		return "socket() failed";
+
+	memset(request, 0, sizeof(struct route_entry));
+	request->destination = (struct sockaddr *)to;
+
+	if (ioctl(sock, SIOCGETRT, buffer, sizeof(buffer)) < 0) {
+		close(sock);
+		return "ioctl(SIOCGETRT) failed";
+	}
+
+	if (request->source != NULL && request->source->sa_family == AF_INET)
+		memcpy(from, request->source, sizeof(struct sockaddr_in));
+
+	close(sock);
+
+	if (request->source == NULL || request->source->sa_family != AF_INET)
+		return "No address available";
+
+	return NULL;
+}