1 files changed, 103 insertions, 0 deletions
diff --git a/libglouglou/examples/traceroute.c b/libglouglou/examples/traceroute.c
new file mode 100644
index 0000000..080274f
--- /dev/null
+++ b/libglouglou/examples/traceroute.c
@@ -0,0 +1,103 @@
+#include <sys/types.h>
+
+#if !defined(__OpenBSD__)
+#define __USE_GNU
+#define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <pwd.h>
+#include <grp.h>
+#include <string.h>
+#include <err.h>
+
+#include <libggnet_traceroute.h>
+
+static void _droppriv(char *, int, char *);
+static void _cb_traceroute(struct in_addr *,
+                           struct ggnet_traceroute_req *, void *);
+
+struct event_base *_ev_base;
+struct ggnet_traceroute_req *_route = NULL;
+int _answer = 0;
+
+int
+main(int argc, char *argv[])
+{
+  struct ggnet_traceroute *ggtr;
+  struct ggnet_traceroute_hop *hop;
+  struct in_addr ip;
+  struct timeval tv;
+
+  if (argc < 2) {
+    printf("usage: traceroute <ip>\n");
+    exit(1);
+  }
+  inet_aton(argv[1], &ip);
+  ip.s_addr = ntohl(ip.s_addr);
+
+  bzero(&tv, sizeof(struct timeval));
+  tv.tv_sec = 10;
+
+  _ev_base = event_base_new();
+
+  ggtr = ggnet_traceroute_new(_ev_base, "lo"); // XXX rm iface
+  _droppriv("nobody", 1, NULL); /* bad practise you should use dedicated user */
+  ggnet_traceroute_trace(ggtr, &ip, _cb_traceroute, NULL);
+
+  event_base_loopexit(_ev_base, &tv);
+  event_base_dispatch(_ev_base);
+
+  if (_answer) {
+    printf("%x:\n", ip.s_addr);
+    LIST_FOREACH(hop, &_route->hops, entry) {
+      printf("%x (%d)\n", hop->ip.s_addr, hop->delay);
+    }
+  } else {
+    printf("no answer\n");
+  }
+  return 0;
+}
+
+/* from libglouglou utils.c */
+static void
+_droppriv(char *user, int do_chroot, char *chroot_path)
+{
+	struct passwd	*pw;
+
+	pw = getpwnam(user);
+	if (!pw)
+		err(1, "unknown user %s", user);
+	if (do_chroot) {
+    if (!chroot_path)
+      chroot_path = pw->pw_dir;
+    if (chroot(chroot_path) != 0)
+      err(1, "unable to chroot");
+  }
+	if (chdir("/") != 0)
+		err(1, "unable to chdir");
+	if (setgroups(1, &pw->pw_gid) == -1)
+		err(1, "setgroups() failed");
+	if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1)
+		err(1, "setresgid failed");
+	if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
+		err(1, "setresuid() failed");
+	endpwent();
+	printf("droppriv done\n");
+}
+
+
+static void
+_cb_traceroute(struct in_addr *ip,
+               struct ggnet_traceroute_req *route, void *data)
+{
+  _route = route;
+  _answer = 1;
+  event_base_loopexit(_ev_base, NULL);
+}