Local changes: - In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h. Our system net/dlt.h is pulled in from net/bpf.h. - sys/net/dlt.h: Incorporate changes from libpcap 1.10.3. - lib/libpcap/Makefile: Update for libpcap 1.10.3. Changelog: https://git.tcpdump.org/libpcap/blob/95691ebe7564afa3faa5c6ba0dbd17e351be455a:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/libpcap-1.10.3.tar.gz Sponsored by: The FreeBSD Foundation
477 lines
12 KiB
C
477 lines
12 KiB
C
/*
|
|
* Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Utilities for message formatting used both by libpcap and rpcapd.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "ftmacros.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "pcap-int.h"
|
|
|
|
#include "portability.h"
|
|
|
|
#include "fmtutils.h"
|
|
|
|
#ifdef _WIN32
|
|
#include "charconv.h"
|
|
#endif
|
|
|
|
/*
|
|
* Set the encoding.
|
|
*/
|
|
#ifdef _WIN32
|
|
/*
|
|
* True if we shouold use UTF-8.
|
|
*/
|
|
static int use_utf_8;
|
|
|
|
void
|
|
pcap_fmt_set_encoding(unsigned int opts)
|
|
{
|
|
if (opts == PCAP_CHAR_ENC_UTF_8)
|
|
use_utf_8 = 1;
|
|
}
|
|
#else
|
|
void
|
|
pcap_fmt_set_encoding(unsigned int opts _U_)
|
|
{
|
|
/*
|
|
* Nothing to do here.
|
|
*/
|
|
}
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
/*
|
|
* Convert a null-terminated UTF-16LE string to UTF-8, putting it into
|
|
* a buffer starting at the specified location and stopping if we go
|
|
* past the specified size. This will only put out complete UTF-8
|
|
* sequences.
|
|
*
|
|
* We do this ourselves because Microsoft doesn't offer a "convert and
|
|
* stop at a UTF-8 character boundary if we run out of space" routine.
|
|
*/
|
|
#define IS_LEADING_SURROGATE(c) \
|
|
((c) >= 0xd800 && (c) < 0xdc00)
|
|
#define IS_TRAILING_SURROGATE(c) \
|
|
((c) >= 0xdc00 && (c) < 0xe000)
|
|
#define SURROGATE_VALUE(leading, trailing) \
|
|
(((((leading) - 0xd800) << 10) | ((trailing) - 0xdc00)) + 0x10000)
|
|
#define REPLACEMENT_CHARACTER 0x0FFFD
|
|
|
|
static char *
|
|
utf_16le_to_utf_8_truncated(const wchar_t *utf_16, char *utf_8,
|
|
size_t utf_8_len)
|
|
{
|
|
wchar_t c, c2;
|
|
uint32_t uc;
|
|
|
|
if (utf_8_len == 0) {
|
|
/*
|
|
* Not even enough room for a trailing '\0'.
|
|
* Don't put anything into the buffer.
|
|
*/
|
|
return (utf_8);
|
|
}
|
|
|
|
while ((c = *utf_16++) != '\0') {
|
|
if (IS_LEADING_SURROGATE(c)) {
|
|
/*
|
|
* Leading surrogate. Must be followed by
|
|
* a trailing surrogate.
|
|
*/
|
|
c2 = *utf_16;
|
|
if (c2 == '\0') {
|
|
/*
|
|
* Oops, string ends with a lead
|
|
* surrogate. Try to drop in
|
|
* a REPLACEMENT CHARACTER, and
|
|
* don't move the string pointer,
|
|
* so on the next trip through
|
|
* the loop we grab the terminating
|
|
* '\0' and quit.
|
|
*/
|
|
uc = REPLACEMENT_CHARACTER;
|
|
} else {
|
|
/*
|
|
* OK, we can consume this 2-octet
|
|
* value.
|
|
*/
|
|
utf_16++;
|
|
if (IS_TRAILING_SURROGATE(c2)) {
|
|
/*
|
|
* Trailing surrogate.
|
|
* This calculation will,
|
|
* for c being a leading
|
|
* surrogate and c2 being
|
|
* a trailing surrogate,
|
|
* produce a value between
|
|
* 0x100000 and 0x10ffff,
|
|
* so it's always going to be
|
|
* a valid Unicode code point.
|
|
*/
|
|
uc = SURROGATE_VALUE(c, c2);
|
|
} else {
|
|
/*
|
|
* Not a trailing surroage;
|
|
* try to drop in a
|
|
* REPLACEMENT CHARACTER.
|
|
*/
|
|
uc = REPLACEMENT_CHARACTER;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* Not a leading surrogate.
|
|
*/
|
|
if (IS_TRAILING_SURROGATE(c)) {
|
|
/*
|
|
* Trailing surrogate without
|
|
* a preceding leading surrogate.
|
|
* Try to drop in a REPLACEMENT
|
|
* CHARACTER.
|
|
*/
|
|
uc = REPLACEMENT_CHARACTER;
|
|
} else {
|
|
/*
|
|
* This is a valid BMP character;
|
|
* drop it in.
|
|
*/
|
|
uc = c;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, uc is a valid Unicode character; how
|
|
* many bytes worth of UTF-8 does it require?
|
|
*/
|
|
if (uc < 0x0080) {
|
|
/* 1 byte. */
|
|
if (utf_8_len < 2) {
|
|
/*
|
|
* Not enough room for that byte
|
|
* plus a trailing '\0'.
|
|
*/
|
|
break;
|
|
}
|
|
*utf_8++ = (char)uc;
|
|
utf_8_len--;
|
|
} else if (uc < 0x0800) {
|
|
/* 2 bytes. */
|
|
if (utf_8_len < 3) {
|
|
/*
|
|
* Not enough room for those bytes
|
|
* plus a trailing '\0'.
|
|
*/
|
|
break;
|
|
}
|
|
*utf_8++ = ((uc >> 6) & 0x3F) | 0xC0;
|
|
*utf_8++ = ((uc >> 0) & 0x3F) | 0x80;
|
|
utf_8_len -= 2;
|
|
} else if (uc < 0x010000) {
|
|
/* 3 bytes. */
|
|
if (utf_8_len < 4) {
|
|
/*
|
|
* Not enough room for those bytes
|
|
* plus a trailing '\0'.
|
|
*/
|
|
break;
|
|
}
|
|
*utf_8++ = ((uc >> 12) & 0x0F) | 0xE0;
|
|
*utf_8++ = ((uc >> 6) & 0x3F) | 0x80;
|
|
*utf_8++ = ((uc >> 0) & 0x3F) | 0x80;
|
|
utf_8_len -= 3;
|
|
} else {
|
|
/* 4 bytes. */
|
|
if (utf_8_len < 5) {
|
|
/*
|
|
* Not enough room for those bytes
|
|
* plus a trailing '\0'.
|
|
*/
|
|
break;
|
|
}
|
|
*utf_8++ = ((uc >> 18) & 0x03) | 0xF0;
|
|
*utf_8++ = ((uc >> 12) & 0x3F) | 0x80;
|
|
*utf_8++ = ((uc >> 6) & 0x3F) | 0x80;
|
|
*utf_8++ = ((uc >> 0) & 0x3F) | 0x80;
|
|
utf_8_len -= 3;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, we have enough room for (at least) a trailing '\0'.
|
|
* (We started out with enough room, thanks to the test
|
|
* for a zero-length buffer at the beginning, and if
|
|
* there wasn't enough room for any character we wanted
|
|
* to put into the buffer *plus* a trailing '\0',
|
|
* we'd have quit before putting it into the buffer,
|
|
* and thus would have left enough room for the trailing
|
|
* '\0'.)
|
|
*
|
|
* Drop it in.
|
|
*/
|
|
*utf_8 = '\0';
|
|
|
|
/*
|
|
* Return a pointer to the terminating '\0', in case we
|
|
* want to drop something in after that.
|
|
*/
|
|
return (utf_8);
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
/*
|
|
* Generate an error message based on a format, arguments, and an
|
|
* errno, with a message for the errno after the formatted output.
|
|
*/
|
|
void
|
|
pcap_fmt_errmsg_for_errno(char *errbuf, size_t errbuflen, int errnum,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
pcap_vfmt_errmsg_for_errno(errbuf, errbuflen, errnum, fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
void
|
|
pcap_vfmt_errmsg_for_errno(char *errbuf, size_t errbuflen, int errnum,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
size_t msglen;
|
|
char *p;
|
|
size_t errbuflen_remaining;
|
|
|
|
(void)vsnprintf(errbuf, errbuflen, fmt, ap);
|
|
msglen = strlen(errbuf);
|
|
|
|
/*
|
|
* Do we have enough space to append ": "?
|
|
* Including the terminating '\0', that's 3 bytes.
|
|
*/
|
|
if (msglen + 3 > errbuflen) {
|
|
/* No - just give them what we've produced. */
|
|
return;
|
|
}
|
|
p = errbuf + msglen;
|
|
errbuflen_remaining = errbuflen - msglen;
|
|
*p++ = ':';
|
|
*p++ = ' ';
|
|
*p = '\0';
|
|
errbuflen_remaining -= 2;
|
|
|
|
/*
|
|
* Now append the string for the error code.
|
|
*/
|
|
#if defined(HAVE__WCSERROR_S)
|
|
/*
|
|
* We have a Windows-style _wcserror_s().
|
|
* Generate a UTF-16LE error message.
|
|
*/
|
|
wchar_t utf_16_errbuf[PCAP_ERRBUF_SIZE];
|
|
errno_t err = _wcserror_s(utf_16_errbuf, PCAP_ERRBUF_SIZE, errnum);
|
|
if (err != 0) {
|
|
/*
|
|
* It doesn't appear to be documented anywhere obvious
|
|
* what the error returns from _wcserror_s().
|
|
*/
|
|
snprintf(p, errbuflen_remaining, "Error %d", errnum);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Now convert it from UTF-16LE to UTF-8, dropping it in the
|
|
* remaining space in the buffer, and truncating it - cleanly,
|
|
* on a UTF-8 character boundary - if it doesn't fit.
|
|
*/
|
|
utf_16le_to_utf_8_truncated(utf_16_errbuf, p, errbuflen_remaining);
|
|
|
|
/*
|
|
* Now, if we're not in UTF-8 mode, convert errbuf to the
|
|
* local code page.
|
|
*/
|
|
if (!use_utf_8)
|
|
utf_8_to_acp_truncated(errbuf);
|
|
#elif defined(HAVE_GNU_STRERROR_R)
|
|
/*
|
|
* We have a GNU-style strerror_r(), which is *not* guaranteed to
|
|
* do anything to the buffer handed to it, and which returns a
|
|
* pointer to the error string, which may or may not be in
|
|
* the buffer.
|
|
*
|
|
* It is, however, guaranteed to succeed.
|
|
*/
|
|
char strerror_buf[PCAP_ERRBUF_SIZE];
|
|
char *errstring = strerror_r(errnum, strerror_buf, PCAP_ERRBUF_SIZE);
|
|
snprintf(p, errbuflen_remaining, "%s", errstring);
|
|
#elif defined(HAVE_POSIX_STRERROR_R)
|
|
/*
|
|
* We have a POSIX-style strerror_r(), which is guaranteed to fill
|
|
* in the buffer, but is not guaranteed to succeed.
|
|
*/
|
|
int err = strerror_r(errnum, p, errbuflen_remaining);
|
|
if (err == EINVAL) {
|
|
/*
|
|
* UNIX 03 says this isn't guaranteed to produce a
|
|
* fallback error message.
|
|
*/
|
|
snprintf(p, errbuflen_remaining, "Unknown error: %d",
|
|
errnum);
|
|
} else if (err == ERANGE) {
|
|
/*
|
|
* UNIX 03 says this isn't guaranteed to produce a
|
|
* fallback error message.
|
|
*/
|
|
snprintf(p, errbuflen_remaining,
|
|
"Message for error %d is too long", errnum);
|
|
}
|
|
#else
|
|
/*
|
|
* We have neither _wcserror_s() nor strerror_r(), so we're
|
|
* stuck with using pcap_strerror().
|
|
*/
|
|
snprintf(p, errbuflen_remaining, "%s", pcap_strerror(errnum));
|
|
#endif
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
/*
|
|
* Generate an error message based on a format, arguments, and a
|
|
* Win32 error, with a message for the Win32 error after the formatted output.
|
|
*/
|
|
void
|
|
pcap_fmt_errmsg_for_win32_err(char *errbuf, size_t errbuflen, DWORD errnum,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
pcap_vfmt_errmsg_for_win32_err(errbuf, errbuflen, errnum, fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
void
|
|
pcap_vfmt_errmsg_for_win32_err(char *errbuf, size_t errbuflen, DWORD errnum,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
size_t msglen;
|
|
char *p;
|
|
size_t errbuflen_remaining;
|
|
DWORD retval;
|
|
wchar_t utf_16_errbuf[PCAP_ERRBUF_SIZE];
|
|
size_t utf_8_len;
|
|
|
|
vsnprintf(errbuf, errbuflen, fmt, ap);
|
|
msglen = strlen(errbuf);
|
|
|
|
/*
|
|
* Do we have enough space to append ": "?
|
|
* Including the terminating '\0', that's 3 bytes.
|
|
*/
|
|
if (msglen + 3 > errbuflen) {
|
|
/* No - just give them what we've produced. */
|
|
return;
|
|
}
|
|
p = errbuf + msglen;
|
|
errbuflen_remaining = errbuflen - msglen;
|
|
*p++ = ':';
|
|
*p++ = ' ';
|
|
*p = '\0';
|
|
msglen += 2;
|
|
errbuflen_remaining -= 2;
|
|
|
|
/*
|
|
* Now append the string for the error code.
|
|
*
|
|
* XXX - what language ID to use?
|
|
*
|
|
* For UN*Xes, pcap_strerror() may or may not return localized
|
|
* strings.
|
|
*
|
|
* We currently don't have localized messages for libpcap, but
|
|
* we might want to do so. On the other hand, if most of these
|
|
* messages are going to be read by libpcap developers and
|
|
* perhaps by developers of libpcap-based applications, English
|
|
* might be a better choice, so the developer doesn't have to
|
|
* get the message translated if it's in a language they don't
|
|
* happen to understand.
|
|
*/
|
|
retval = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_MAX_WIDTH_MASK,
|
|
NULL, errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
|
|
utf_16_errbuf, PCAP_ERRBUF_SIZE, NULL);
|
|
if (retval == 0) {
|
|
/*
|
|
* Failed.
|
|
*/
|
|
snprintf(p, errbuflen_remaining,
|
|
"Couldn't get error message for error (%lu)", errnum);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Now convert it from UTF-16LE to UTF-8.
|
|
*/
|
|
p = utf_16le_to_utf_8_truncated(utf_16_errbuf, p, errbuflen_remaining);
|
|
|
|
/*
|
|
* Now append the error number, if it fits.
|
|
*/
|
|
utf_8_len = p - errbuf;
|
|
errbuflen_remaining -= utf_8_len;
|
|
if (utf_8_len == 0) {
|
|
/* The message was empty. */
|
|
snprintf(p, errbuflen_remaining, "(%lu)", errnum);
|
|
} else
|
|
snprintf(p, errbuflen_remaining, " (%lu)", errnum);
|
|
|
|
/*
|
|
* Now, if we're not in UTF-8 mode, convert errbuf to the
|
|
* local code page.
|
|
*/
|
|
if (!use_utf_8)
|
|
utf_8_to_acp_truncated(errbuf);
|
|
}
|
|
#endif
|