Added mtr-packet subprocess

The mtr-packet tool isolates the raw socket sending/receiving of
packets from the mtr user interface.  By isolating the socket
interactions to a separate process, we can be sure that any security
flaws in the user-interface code doesn't expose a raw socket
interface to an attacker attempting to escalate privileges.

This is a bare-bones implementation, only support ICMP,
only support IP version 4, and missing many of the probe customization
features available in mtr.  It will require some more work to reach
feature parity with the current mtr implementation.  But it's a start.

The include mtr-packet man page explains the protocol format
used to communicate with this new process.

Included is an automated test for mtr-packet, implemented using
Python's unittest module.  Though the code actually being tested
is implemented in C, Python make it easy to write test cases.
'make check' will test the current build.

An alternate code-path for Windows is included in the mtr-packet
tool.  The mechanism for sending and receiving network probes
is significantly different for Windows, as compared to Unix-like
operating systems, but the interface provided by mtr-packet is
the same.  'make dist-windows-bin' will make a Windows binary
distribution.  A Cygwin build environment is required, but the
resulting binary distribution doesn't require that Cygwin be
already installed.

Tested on:

Ubuntu 16.10, FreeBSD 11.0, MacOS 10.12.1 (Sierra), Windows 7

Since the code changes are significant, more esoteric operating
systems may require changes.

.gitignore

@@ -19,9 +19,11 @@ stamp-h1*
 
 /autom4te.cache/
 /.deps/
+/packet/.deps/
 /ChangeLog
 /INSTALL
 /mtr
+/mtr-packet
 /mtr.8
 
 /mtr-*.tar.gz

Makefile.am

@@ -1,27 +1,35 @@
-EXTRA_DIST = SECURITY img/mtr_icon.xpm
+EXTRA_DIST = \
+	SECURITY \
+	mtr.bat \
+	img/mtr_icon.xpm \
+	packet/testpacket.py \
+	packet/lint.sh
 
-sbin_PROGRAMS = mtr
+sbin_PROGRAMS = mtr mtr-packet
+TESTS = packet/testpacket.py
 
 PATHFILES =
 CLEANFILES = $(PATHFILES)
 EXTRA_DIST += $(PATHFILES:=.in)
 edit_cmd = sed \
 	-e 's|@VERSION[@]|$(VERSION)|g'
 
-$(PATHFILES): Makefile
+%.8: $(srcdir)/%.8.in
 	@ rm -f $@ $@.tmp
 	$(AM_V_at) $(MKDIR_P) $$(dirname $@)
 	$(AM_V_GEN) srcdir=''; \
 		test -f ./$@.in || srcdir=$(srcdir)/; \
 		$(edit_cmd) $${srcdir}$@.in >$@.tmp
 	@ mv $@.tmp $@
 
-dist_man_MANS = mtr.8
-PATHFILES += mtr.8
+$(PATHFILES): Makefile
+
+dist_man_MANS = mtr.8 mtr-packet.8
+PATHFILES += mtr.8 mtr-packet.8
 
 install-exec-hook: 
-	`setcap cap_net_raw+ep $(DESTDIR)$(sbindir)/mtr` \
-	|| chmod u+s $(DESTDIR)$(sbindir)/mtr
+	`setcap cap_net_raw+ep $(DESTDIR)$(sbindir)/mtr-packet` \
+	|| chmod u+s $(DESTDIR)$(sbindir)/mtr-packet
 
 mtr_SOURCES = mtr.c mtr.h \
               net.c net.h \
@@ -32,6 +40,7 @@ mtr_SOURCES = mtr.c mtr.h \
               report.c report.h \
               select.c select.h \
               utils.c utils.h \
+              packet/cmdparse.c packet/cmdparse.h \
               mtr-curses.h \
               img/mtr_icon.xpm \
               mtr-gtk.h
@@ -65,6 +74,60 @@ mtr_INCLUDES = $(GLIB_CFLAGS) -I$(top_builddir) -I$(top_srcdir)
 mtr_CFLAGS = $(GTK_CFLAGS) $(NCURSES_CFLAGS)
 mtr_LDADD = $(GTK_LIBS) $(NCURSES_LIBS) $(RESOLV_LIBS)
 
+
+mtr_packet_SOURCES = \
+	packet/packet.c \
+	packet/cmdparse.c packet/cmdparse.h \
+	packet/command.c packet/command.h \
+	packet/platform.h \
+	packet/probe.c packet/probe.h \
+	packet/protocols.h \
+	packet/timeval.c packet/timeval.h \
+	packet/wait.h
+
+
+if CYGWIN
+
+mtr_packet_SOURCES += \
+	packet/command_cygwin.c packet/command_cygwin.h \
+	packet/probe_cygwin.c packet/probe_cygwin.h \
+	packet/wait_cygwin.c
+mtr_packet_LDADD = -lcygwin -licmp -lws2_32
+
+dist_windows_aux = \
+	$(srcdir)/mtr.bat \
+	$(srcdir)/AUTHORS \
+	$(srcdir)/COPYING \
+	$(srcdir)/README \
+	$(srcdir)/NEWS
+
+distwindir = $(distdir)-win-$(host_cpu)
+
+#  Bundle necessary files for a Windows binary distribution
+distdir-win: $(dist_windows_aux) mtr.exe mtr-packet.exe
+	rm -fr $(distwindir)
+	mkdir -p $(distwindir) $(distwindir)/bin $(distwindir)/terminfo
+	cp $(dist_windows_aux) -t $(distwindir)
+	cp mtr.exe mtr-packet.exe -t $(distwindir)/bin
+	ldd mtr.exe | grep -v cygdrive | awk '{ print $$3 }' | xargs cp -t $(distwindir)/bin
+	cp `find /usr/share/terminfo -name cygwin | xargs dirname` -r $(distwindir)/terminfo
+
+#  Zip up a Windows binary distribution
+dist-windows-bin: distdir-win
+	rm -f $(distwindir).zip
+	zip -rq $(distwindir).zip $(distwindir)
+	rm -fr $(distwindir)
+
+else  # if CYGWIN
+
+mtr_packet_SOURCES += \
+	packet/command_unix.c packet/command_unix.h \
+	packet/probe_unix.c packet/probe_unix.h \
+	packet/wait_unix.c
+
+endif  # if CYGWIN
+
+
 if BUILD_BASH_COMPLETION
 dist_bashcompletion_DATA = bash-completion/mtr
 endif

bootstrap.sh

@@ -3,5 +3,4 @@
 aclocal $ACLOCAL_OPTS
 autoheader
 automake --add-missing --copy --foreign
-autoconf
-
+autoconf --force

configure.ac

@@ -17,6 +17,7 @@ m4_ifdef([AM_SILENT_RULES],
   [AM_SILENT_RULES([yes])],
   [AC_SUBST([AM_DEFAULT_VERBOSITY], [1])])
 
+AC_CANONICAL_HOST
 AC_PROG_CC
 
 # Check pkg-config availability.
@@ -29,6 +30,8 @@ before running ./bootstrap.sh again.])
 ])
 PKG_PROG_PKG_CONFIG
 
+AM_CONDITIONAL([CYGWIN], [test "$host_os" = cygwin])
+
 # Check bytes in types.
 AC_CHECK_SIZEOF([unsigned char], [1])
 AC_CHECK_SIZEOF([unsigned short], [2])

display.c

@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
+#include <time.h>
 
 #include "mtr.h"
 #include "display.h"
@@ -107,8 +108,12 @@ extern void display_open(struct mtr_ctl *ctl)
 }
 
 
-extern void display_close(struct mtr_ctl *ctl, time_t now)
+extern void display_close(struct mtr_ctl *ctl)
 {
+  time_t now;
+
+  now = time(NULL);
+
   switch(ctl->DisplayMode) {
   case DisplayReport:
     report_close(ctl);

display.h

@@ -53,7 +53,7 @@ enum {
 /*  Prototypes for display.c  */
 extern void display_detect(struct mtr_ctl *ctl, int *argc, char ***argv);
 extern void display_open(struct mtr_ctl *ctl);
-extern void display_close(struct mtr_ctl *ctl, time_t now);
+extern void display_close(struct mtr_ctl *ctl);
 extern void display_redraw(struct mtr_ctl *ctl);
 extern void display_rawxmit(struct mtr_ctl *ctl, int hostnum, int seq);
 extern void display_rawping(struct mtr_ctl *ctl, int hostnum, int msec, int seq);