Add support for UTF-8 strings on Windows.

Add a routine pcap_init() that initializes pcap, specifying whether
strings should be treated as being in UTF-8 or a local character
encoding.

On UN*Xes, we don't change our behavior based on that setting; if there
is ever an issue with local character encodings *other* than UTF-8, we
can use it.

On Windows, the local character encoding is the local ANSI code page; if
pcap_init() isn't called, or is called with PCAP_CHAR_ENC_LOCAL, strings
are treated as being in the current ANSI code page, as before, otherwise
they're treated as being in UTF-8.  This includes file path names and
error messages.

In addition, if pcap_init() is called, regardless of the options, we
disable pcap_lookupdev(), making it always return NULL, as it retunred
*UTF-16LE* strings (plural!) on Windows NT, and pcap_create() had to
check for UTF-16LE strings to work around that.  That workaround is
unsafe (it will read past the end of the input string if the string is
one ASCII character), and is also disabled if pcap_init() is called.

We also make rpcapd send UTF-8 error message strings over the wire;
sending local code page strings is a Bad Idea, as the client has no idea
what the server's code page is.  (Do not assume the client and server
are necessarily in the same location.)

Fix the capitalization of "Winsock" while we're at it; Microsoft appears
to spell it "Winsock", rather than "WinSock".

1 files changed, 44 insertions, 0 deletions

diff --git a/charconv.h b/charconv.h
new file mode 100644
index 00000000..a37d424b
--- /dev/null
+++ b/charconv.h
@@ -0,0 +1,44 @@
+/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the Computer Systems
+ *	Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef charonv_h
+#define charonv_h
+
+#ifdef _WIN32
+extern wchar_t *cp_to_utf_16le(UINT codepage, const char *cp_string, DWORD flags);
+extern char *utf_16le_to_cp(UINT codepage, const wchar_t *utf16le_string);
+extern void utf_8_to_acp_truncated(char *);
+#endif
+
+#endif