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diag.c revision 1.10 
      1 /*	$NetBSD: diag.c,v 1.10 2012/03/22 22:58:15 joerg Exp $	*/
      2 
      3  /*
      4   * Routines to report various classes of problems. Each report is decorated
      5   * with the current context (file name and line number), if available.
      6   *
      7   * tcpd_warn() reports a problem and proceeds.
      8   *
      9   * tcpd_jump() reports a problem and jumps.
     10   *
     11   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
     12   */
     13 
     14 #include <sys/cdefs.h>
     15 #ifndef lint
     16 #if 0
     17 static char sccsid[] = "@(#) diag.c 1.1 94/12/28 17:42:20";
     18 #else
     19 __RCSID("$NetBSD: diag.c,v 1.10 2012/03/22 22:58:15 joerg Exp $");
     20 #endif
     21 #endif
     22 
     23 /* System libraries */
     24 
     25 #include <syslog.h>
     26 #include <stdarg.h>
     27 #include <stdio.h>
     28 #include <stdlib.h>
     29 #include <setjmp.h>
     30 #include <string.h>
     31 #include <errno.h>
     32 
     33 /* Local stuff */
     34 
     35 #include "tcpd.h"
     36 
     37 struct tcpd_context tcpd_context;
     38 jmp_buf tcpd_buf;
     39 
     40 static void tcpd_diag(int, const char *, const char *, va_list)
     41     __printflike(3,0);
     42 
     43 /* tcpd_diag - centralize error reporter */
     44 
     45 static void
     46 tcpd_diag(int severity, const char *tag, const char *fmt, va_list ap)
     47 {
     48     char *buf;
     49     int     oerrno;
     50 
     51     /* save errno in case we need it */
     52     oerrno = errno;
     53 
     54     if (vasprintf(&buf, fmt, ap) == -1)
     55 	buf = __UNCONST(fmt);
     56 
     57     errno = oerrno;
     58 
     59     /* contruct the tag for the log entry */
     60     if (tcpd_context.file)
     61 	syslog(severity, "%s: %s, line %d: %s",
     62 	    tag, tcpd_context.file, tcpd_context.line, buf);
     63     else
     64 	syslog(severity, "%s: %s", tag, buf);
     65 
     66     if (buf != fmt)
     67         free(buf);
     68 }
     69 
     70 /* tcpd_warn - report problem of some sort and proceed */
     71 
     72 void
     73 tcpd_warn(const char *format, ...)
     74 {
     75     va_list ap;
     76 
     77     va_start(ap, format);
     78     tcpd_diag(LOG_ERR, "warning", format, ap);
     79     va_end(ap);
     80 }
     81 
     82 /* tcpd_jump - report serious problem and jump */
     83 
     84 void
     85 tcpd_jump(const char *format, ...)
     86 {
     87     va_list ap;
     88 
     89     va_start(ap, format);
     90     tcpd_diag(LOG_ERR, "error", format, ap);
     91     va_end(ap);
     92     longjmp(tcpd_buf, AC_ERROR);
     93 }
     94