215 lines
6.4 KiB
C
215 lines
6.4 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Utilities for message formatting used both by libpcap and rpcapd.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "ftmacros.h"
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <pcap/pcap.h>
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#include "portability.h"
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#include "fmtutils.h"
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/*
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* Generate an error message based on a format, arguments, and an
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* errno, with a message for the errno after the formatted output.
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*/
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void
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pcap_fmt_errmsg_for_errno(char *errbuf, size_t errbuflen, int errnum,
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const char *fmt, ...)
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{
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va_list ap;
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size_t msglen;
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char *p;
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size_t errbuflen_remaining;
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va_start(ap, fmt);
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pcap_vsnprintf(errbuf, errbuflen, fmt, ap);
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va_end(ap);
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msglen = strlen(errbuf);
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/*
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* Do we have enough space to append ": "?
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* Including the terminating '\0', that's 3 bytes.
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*/
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if (msglen + 3 > errbuflen) {
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/* No - just give them what we've produced. */
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return;
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}
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p = errbuf + msglen;
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errbuflen_remaining = errbuflen - msglen;
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*p++ = ':';
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*p++ = ' ';
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*p = '\0';
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msglen += 2;
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errbuflen_remaining -= 2;
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/*
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* Now append the string for the error code.
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*/
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#if defined(HAVE_STRERROR_S)
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/*
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* We have a Windows-style strerror_s().
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*/
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errno_t err = strerror_s(p, errbuflen_remaining, errnum);
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if (err != 0) {
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/*
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* It doesn't appear to be documented anywhere obvious
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* what the error returns from strerror_s().
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*/
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pcap_snprintf(p, errbuflen_remaining, "Error %d", errnum);
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}
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#elif defined(HAVE_GNU_STRERROR_R)
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/*
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* We have a GNU-style strerror_r(), which is *not* guaranteed to
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* do anything to the buffer handed to it, and which returns a
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* pointer to the error string, which may or may not be in
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* the buffer.
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*
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* It is, however, guaranteed to succeed.
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*/
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char strerror_buf[PCAP_ERRBUF_SIZE];
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char *errstring = strerror_r(errnum, strerror_buf, PCAP_ERRBUF_SIZE);
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pcap_snprintf(p, errbuflen_remaining, "%s", errstring);
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#elif defined(HAVE_POSIX_STRERROR_R)
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/*
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* We have a POSIX-style strerror_r(), which is guaranteed to fill
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* in the buffer, but is not guaranteed to succeed.
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*/
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int err = strerror_r(errnum, p, errbuflen_remaining);
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if (err == EINVAL) {
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/*
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* UNIX 03 says this isn't guaranteed to produce a
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* fallback error message.
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*/
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pcap_snprintf(p, errbuflen_remaining, "Unknown error: %d",
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errnum);
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} else if (err == ERANGE) {
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/*
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* UNIX 03 says this isn't guaranteed to produce a
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* fallback error message.
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*/
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pcap_snprintf(p, errbuflen_remaining,
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"Message for error %d is too long", errnum);
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}
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#else
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/*
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* We have neither strerror_s() nor strerror_r(), so we're
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* stuck with using pcap_strerror().
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*/
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pcap_snprintf(p, errbuflen_remaining, "%s", pcap_strerror(errnum));
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#endif
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}
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#ifdef _WIN32
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/*
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* Generate an error message based on a format, arguments, and a
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* Win32 error, with a message for the Win32 error after the formatted output.
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*/
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void
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pcap_fmt_errmsg_for_win32_err(char *errbuf, size_t errbuflen, DWORD errnum,
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const char *fmt, ...)
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{
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va_list ap;
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size_t msglen;
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char *p;
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size_t errbuflen_remaining;
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DWORD retval;
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char win32_errbuf[PCAP_ERRBUF_SIZE+1];
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va_start(ap, fmt);
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pcap_vsnprintf(errbuf, errbuflen, fmt, ap);
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va_end(ap);
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msglen = strlen(errbuf);
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/*
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* Do we have enough space to append ": "?
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* Including the terminating '\0', that's 3 bytes.
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*/
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if (msglen + 3 > errbuflen) {
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/* No - just give them what we've produced. */
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return;
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}
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p = errbuf + msglen;
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errbuflen_remaining = errbuflen - msglen;
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*p++ = ':';
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*p++ = ' ';
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*p = '\0';
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msglen += 2;
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errbuflen_remaining -= 2;
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/*
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* Now append the string for the error code.
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*
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* XXX - what language ID to use?
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*
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* For UN*Xes, pcap_strerror() may or may not return localized
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* strings.
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*
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* We currently don't have localized messages for libpcap, but
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* we might want to do so. On the other hand, if most of these
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* messages are going to be read by libpcap developers and
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* perhaps by developers of libpcap-based applications, English
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* might be a better choice, so the developer doesn't have to
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* get the message translated if it's in a language they don't
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* happen to understand.
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*/
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retval = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_MAX_WIDTH_MASK,
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NULL, errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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win32_errbuf, PCAP_ERRBUF_SIZE, NULL);
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if (retval == 0) {
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/*
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* Failed.
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*/
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pcap_snprintf(p, errbuflen_remaining,
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"Couldn't get error message for error (%lu)", errnum);
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return;
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}
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pcap_snprintf(p, errbuflen_remaining, "%s (%lu)", win32_errbuf, errnum);
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}
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#endif
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