Make tcpdump find wpcap.dll on Windows if it's not in the system library.

[tcpdump] / tcpdump.c

diff --git a/tcpdump.c b/tcpdump.c
index faabe0bfd8452f038fdeecf24d2a0600d8b7380c..12810a745e5c971a20bf911672ec6f6194b8f062 100644 (file)
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -1521,6 +1521,42 @@ main(int argc, char **argv)
        netdissect_options Ndo;
        netdissect_options *ndo = &Ndo;
 
+#ifdef _WIN32
+       /*
+        * We need to look for wpcap.dll in \Windows\System32\Npcap first,
+        * as either:
+        *
+        *  1) WinPcap isn't installed and Npcap isn't installed in "WinPcap
+        *     API-compatible Mode", so there's no wpcap.dll in
+        *     \Windows\System32, only in \Windows\System32\Npcap;
+        *
+        *  2) WinPcap is installed and Npcap isn't installed in "WinPcap
+        *     API-compatible Mode", so the wpcap.dll in \Windows\System32
+        *     is a WinPcap DLL, but we'd prefer an Npcap DLL (we should
+        *     work with either one if we're configured against WinPcap,
+        *     and we'll probably require Npcap if we're configured againt
+        *     it), and that's in \Windows\System32\Npcap;
+        *
+        *  3) Npcap is installed in "WinPcap API-compatible Mode", so both
+        *     \Windows\System32 and \Windows\System32\Npcap have an Npcap
+        *     wpcap.dll.
+        *
+        * Unfortunately, Windows has no notion of an rpath, so we can't
+        * set the rpath to include \Windows\System32\Npcap at link time;
+        * what we need to do is to link wpcap as a delay-load DLL and
+        * add \Windows\System32\Npcap to the DLL search path early in
+        * main() with a call to SetDllDirectory().
+        *
+        * The same applies to packet.dll.
+        *
+        * We add \Windows\System32\Npcap here.
+        *
+        * See https://npcap.com/guide/npcap-devguide.html#npcap-feature-native-dll-implicitly
+        */
+       if (!SetDllDirectoryA("C:\\Windows\\System32\\Npcap"))
+               error("SetDllDirectory failed");
+#endif
+
        /*
         * Initialize the netdissect code.
         */