Implement new environment variable to allow the use of non-IFS

compatible LSP's on Windows to allow Perl to work in conjunction
with a firewall such as McAfee Guardian.

Bug report and possible solutions by Ken Fox <kfox@ford.com>;
further assistance by Artiom Morozov <artiom@phreaker.net>.

p4raw-id: //depot/perl@23275

diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index 3feab02..3238a5c 100644 (file)
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -1111,6 +1111,20 @@ fit for interactive use, and setting COMSPEC to such a shell may
 interfere with the proper functioning of other programs (which usually
 look in COMSPEC to find a shell fit for interactive use).
 
+=item PERL_ALLOW_NON_IFS_LSP (specific to the Win32 port)
+
+Set to 1 to allow the use of non-IFS compatible LSP's.
+Perl normally searches for an IFS-compatible LSP because this is required
+for its emulation of Windows sockets as real filehandles.  However, this may
+cause problems if you have a firewall such as McAfee Guardian which requires
+all applications to use its LSP which is not IFS-compatible, because clearly
+Perl will normally avoid using such an LSP.
+Setting this environment variable to 1 means that Perl will simply use the
+first suitable LSP enumerated in the catalog, which keeps McAfee Guardian
+happy (and in that particular case Perl still works too because McAfee
+Guardian's LSP actually plays some other games which allow applications
+requiring IFS compatibility to work).
+
 =item PERL_DEBUG_MSTATS
 
 Relevant only if perl is compiled with the malloc included with the perl

diff --git a/win32/win32sck.c b/win32/win32sck.c
index 0e2be30..58b13e0 100644 (file)
--- a/win32/win32sck.c
+++ b/win32/win32sck.c
@@ -398,10 +398,15 @@ convert_proto_info_w2a(WSAPROTOCOL_INFOW *in, WSAPROTOCOL_INFOA *out)
 SOCKET
 open_ifs_socket(int af, int type, int protocol)
 {
+    dTHX;
+    char *s;
     unsigned long proto_buffers_len = 0;
     int error_code;
     SOCKET out = INVALID_SOCKET;
 
+    if ((s = PerlEnv_getenv("PERL_ALLOW_NON_IFS_LSP")) && atoi(s))
+        return WSASocket(af, type, protocol, NULL, 0, 0);
+
     if (WSCEnumProtocols(NULL, NULL, &proto_buffers_len, &error_code) == SOCKET_ERROR
         && error_code == WSAENOBUFS)
     {