Fix compile error against miniupnpc-1.6 when --enable-upnp

The bump from miniupnpc-1.5 to 1.6 changes the definition of
two functions used by tor-fw-helper-upnp.c, upnpDiscover() and
UPNP_AddPortMapping().  This patch addresses this and adds a
check in configure.in for backwards compatibility.

Thanks to Nickolay Kolchin-Semyonov for some hints.

X-Tor-Bug-URL: https://trac.torproject.org/projects/tor/ticket/5434
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=376621
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

configure.in

@@ -592,15 +592,34 @@ dnl There are no packages for Debian or Redhat as of this patch
 
 if test "$upnp" = "true"; then
     AC_DEFINE(MINIUPNPC, 1, [Define to 1 if we are building with UPnP.])
-    TOR_SEARCH_LIBRARY(libminiupnpc, $trylibminiupnpcdir, [-lminiupnpc $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
-        [#include <miniupnpc/miniwget.h>
-         #include <miniupnpc/miniupnpc.h>
-         #include <miniupnpc/upnpcommands.h>],
-        [void upnpDiscover(int delay, const char * multicastif,
-         const char * minissdpdsock, int sameport);],
-        [upnpDiscover(1, 0, 0, 0); exit(0);],
-        [--with-libminiupnpc-dir],
-        [/usr/lib/])
+
+    dnl Before we call TOR_SEARCH_LIBRARY we'll do a quick compile test
+    dnl to see if we have miniupnpc-1.5 or -1.6
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <miniupnpc/miniupnpc.h>],
+        [upnpDiscover(1, 0, 0, 0);exit(0);])],[miniupnpc15="true"],[miniupnpc15="false"])
+
+    if test "$miniupnpc15" = "true" ; then
+        AC_DEFINE([MINIUPNPC15],[1],[libminiupnpc version 1.5 found])
+        TOR_SEARCH_LIBRARY(libminiupnpc, $trylibminiupnpcdir, [-lminiupnpc $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
+            [#include <miniupnpc/miniwget.h>
+             #include <miniupnpc/miniupnpc.h>
+             #include <miniupnpc/upnpcommands.h>],
+            [void upnpDiscover(int delay, const char * multicastif,
+             const char * minissdpdsock, int sameport);],
+            [upnpDiscover(1, 0, 0, 0); exit(0);],
+            [--with-libminiupnpc-dir],
+            [/usr/lib/])
+    else
+        TOR_SEARCH_LIBRARY(libminiupnpc, $trylibminiupnpcdir, [-lminiupnpc $TOR_LIB_WS32 $TOR_LIB_IPHLPAPI],
+            [#include <miniupnpc/miniwget.h>
+             #include <miniupnpc/miniupnpc.h>
+             #include <miniupnpc/upnpcommands.h>],
+            [void upnpDiscover(int delay, const char * multicastif,
+             const char * minissdpdsock, int sameport, int ipv6, int * error);],
+            [upnpDiscover(1, 0, 0, 0, 0, 0); exit(0);],
+            [--with-libminiupnpc-dir],
+            [/usr/lib/])
+    fi
 fi
 
 AC_SYS_LARGEFILE

src/tools/tor-fw-helper/tor-fw-helper-upnp.c

@@ -78,7 +78,11 @@ tor_upnp_init(tor_fw_options_t *options, void *backend_state)
   memset(&(state->data), 0, sizeof(struct IGDdatas));
   state->init = 0;
 
+#ifdef MINIUPNPC15
   devlist = upnpDiscover(UPNP_DISCOVER_TIMEOUT, NULL, NULL, 0);
+#else
+  devlist = upnpDiscover(UPNP_DISCOVER_TIMEOUT, NULL, NULL, 0, 0, NULL);
+#endif
   if (NULL == devlist) {
     fprintf(stderr, "E: upnpDiscover returned: NULL\n");
     return UPNP_ERR_NODEVICESFOUND;
@@ -178,7 +182,11 @@ tor_upnp_add_tcp_mapping(tor_fw_options_t *options, void *backend_state)
   r = UPNP_AddPortMapping(state->urls.controlURL,
                           state->data.first.servicetype,
                           external_port_str, internal_port_str,
+#ifdef MINIUPNPC15
                           state->lanaddr, UPNP_DESC, "TCP", 0);
+#else
+                          state->lanaddr, UPNP_DESC, "TCP", 0, 0);
+#endif
   if (r != UPNPCOMMAND_SUCCESS)
     return UPNP_ERR_ADDPORTMAPPING;