NetBSD/lib/libwrap/diag.c

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/* $NetBSD: diag.c,v 1.7 2001/09/24 17:55:47 atatat Exp $ */
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/*
* Routines to report various classes of problems. Each report is decorated
* with the current context (file name and line number), if available.
*
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* tcpd_warn() reports a problem and proceeds.
*
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* tcpd_jump() reports a problem and jumps.
*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#include <sys/cdefs.h>
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#ifndef lint
#if 0
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static char sccsid[] = "@(#) diag.c 1.1 94/12/28 17:42:20";
#else
__RCSID("$NetBSD: diag.c,v 1.7 2001/09/24 17:55:47 atatat Exp $");
#endif
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#endif
/* System libraries */
#include <syslog.h>
#include <stdio.h>
#include <setjmp.h>
#include <string.h>
#include <errno.h>
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/* Local stuff */
#include "tcpd.h"
#include "mystdarg.h"
struct tcpd_context tcpd_context;
jmp_buf tcpd_buf;
static void tcpd_diag __P((int, char *, char *, va_list))
__attribute__((__format__(__printf__, 3, 0)));
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/* tcpd_diag - centralize error reporter */
static void tcpd_diag(severity, tag, format, ap)
int severity;
char *tag;
char *format;
va_list ap;
{
char fmt[BUFSIZ];
char buf[BUFSIZ];
int i, o, oerrno;
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/* save errno in case we need it */
oerrno = errno;
/* contruct the tag for the log entry */
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if (tcpd_context.file)
(void)snprintf(buf, sizeof buf, "%s: %s, line %d: ",
tag, tcpd_context.file, tcpd_context.line);
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else
(void)snprintf(buf, sizeof buf, "%s: ", tag);
/* change % to %% in tag before appending the format */
for (i = 0, o = 0; buf[i] != '\0'; ) {
if (buf[i] == '%') {
fmt[o] = '%';
if (o < sizeof(fmt) - 1)
o++;
}
fmt[o] = buf[i++];
if (o < sizeof(fmt) - 1)
o++;
}
/* append format and force null termination */
fmt[o] = '\0';
strncat(fmt, format, sizeof(fmt) - o);
fmt[sizeof(fmt) - 1] = '\0';
errno = oerrno;
vsyslog(severity, fmt, ap);
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}
/* tcpd_warn - report problem of some sort and proceed */
void VARARGS(tcpd_warn, char *, format)
{
va_list ap;
VASTART(ap, char *, format);
tcpd_diag(LOG_ERR, "warning", format, ap);
VAEND(ap);
}
/* tcpd_jump - report serious problem and jump */
void VARARGS(tcpd_jump, char *, format)
{
va_list ap;
VASTART(ap, char *, format);
tcpd_diag(LOG_ERR, "error", format, ap);
VAEND(ap);
longjmp(tcpd_buf, AC_ERROR);
}