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diag.c revision 1.8 
      1 /*	$NetBSD: diag.c,v 1.8 2004/09/07 13:20:40 jrf 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 1.8 2004/09/07 13:20:40 jrf Exp $");
     20 #endif
     21 #endif
     22 
     23 /* System libraries */
     24 
     25 #include <syslog.h>
     26 #include <stdio.h>
     27 #include <setjmp.h>
     28 #include <string.h>
     29 #include <errno.h>
     30 
     31 /* Local stuff */
     32 
     33 #include "tcpd.h"
     34 #include "mystdarg.h"
     35 
     36 struct tcpd_context tcpd_context;
     37 jmp_buf tcpd_buf;
     38 
     39 static void tcpd_diag __P((int, char *, char *, va_list))
     40 	__attribute__((__format__(__printf__, 3, 0)));
     41 
     42 /* tcpd_diag - centralize error reporter */
     43 
     44 static void tcpd_diag(severity, tag, format, ap)
     45 int     severity;
     46 char   *tag;
     47 char   *format;
     48 va_list ap;
     49 {
     50     char    fmt[BUFSIZ];
     51     char    buf[BUFSIZ];
     52     int     i, o, oerrno;
     53 
     54     /* save errno in case we need it */
     55     oerrno = errno;
     56 
     57     /* contruct the tag for the log entry */
     58     if (tcpd_context.file)
     59 	(void)snprintf(buf, sizeof buf, "%s: %s, line %d: ",
     60 		tag, tcpd_context.file, tcpd_context.line);
     61     else
     62 	(void)snprintf(buf, sizeof buf, "%s: ", tag);
     63 
     64     /* change % to %% in tag before appending the format */
     65     for (i = 0, o = 0; buf[i] != '\0'; ) {
     66 	if (buf[i] == '%') {
     67 	    fmt[o] = '%';
     68 	    if (o < sizeof(fmt) - 1)
     69 		o++;
     70 	}
     71 	fmt[o] = buf[i++];
     72 	if (o < sizeof(fmt) - 1)
     73 	    o++;
     74     }
     75 
     76     /* append format and force null termination */
     77     fmt[o] = '\0';
     78     (void)strlcat(fmt, format, sizeof(fmt) - o);
     79 
     80     errno = oerrno;
     81     vsyslog(severity, fmt, ap);
     82 }
     83 
     84 /* tcpd_warn - report problem of some sort and proceed */
     85 
     86 void    VARARGS(tcpd_warn, char *, format)
     87 {
     88     va_list ap;
     89 
     90     VASTART(ap, char *, format);
     91     tcpd_diag(LOG_ERR, "warning", format, ap);
     92     VAEND(ap);
     93 }
     94 
     95 /* tcpd_jump - report serious problem and jump */
     96 
     97 void    VARARGS(tcpd_jump, char *, format)
     98 {
     99     va_list ap;
    100 
    101     VASTART(ap, char *, format);
    102     tcpd_diag(LOG_ERR, "error", format, ap);
    103     VAEND(ap);
    104     longjmp(tcpd_buf, AC_ERROR);
    105 }
    106