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#include <machine/rtems-bsd-user-space.h>
/*
* 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/pcap.h>
#include "portability.h"
#include "fmtutils.h"
/*
* 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;
size_t msglen;
char *p;
size_t errbuflen_remaining;
va_start(ap, fmt);
pcap_vsnprintf(errbuf, errbuflen, fmt, ap);
va_end(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.
*/
#if defined(HAVE_STRERROR_S)
/*
* We have a Windows-style strerror_s().
*/
errno_t err = strerror_s(p, errbuflen_remaining, errnum);
if (err != 0) {
/*
* It doesn't appear to be documented anywhere obvious
* what the error returns from strerror_s().
*/
pcap_snprintf(p, errbuflen_remaining, "Error %d", errnum);
}
#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);
pcap_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.
*/
pcap_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.
*/
pcap_snprintf(p, errbuflen_remaining,
"Message for error %d is too long", errnum);
}
#else
/*
* We have neither strerror_s() nor strerror_r(), so we're
* stuck with using pcap_strerror().
*/
pcap_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;
size_t msglen;
char *p;
size_t errbuflen_remaining;
DWORD retval;
char win32_errbuf[PCAP_ERRBUF_SIZE+1];
va_start(ap, fmt);
pcap_vsnprintf(errbuf, errbuflen, fmt, ap);
va_end(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 = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_MAX_WIDTH_MASK,
NULL, errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
win32_errbuf, PCAP_ERRBUF_SIZE, NULL);
if (retval == 0) {
/*
* Failed.
*/
pcap_snprintf(p, errbuflen_remaining,
"Couldn't get error message for error (%lu)", errnum);
return;
}
pcap_snprintf(p, errbuflen_remaining, "%s (%lu)", win32_errbuf, errnum);
}
#endif
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