Home | History | Annotate | Line # | Download | only in libwrap
diag.c revision 1.12 
      1 /*	$NetBSD: diag.c,v 1.12 2019/01/10 13:53:26 christos 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 1.12 2019/01/10 13:53:26 christos 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     __sysloglike(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, *buf2, *ptr;
     49 
     50     if ((ptr = strstr(fmt, "%m")) != NULL) {
     51 	if (asprintf(&buf, "%.*s%s%s", (int)(ptr - fmt), fmt, strerror(errno),
     52 	    ptr + 2) == -1)
     53 	    buf = __UNCONST(fmt);
     54     } else {
     55 	buf = __UNCONST(fmt);
     56     }
     57 
     58 
     59     if (vasprintf(&buf2, buf, ap) == -1)
     60 	buf2 = buf;
     61 
     62     errno = oerrno;
     63 
     64     /* contruct the tag for the log entry */
     65     if (tcpd_context.file)
     66 	syslog(severity, "%s: %s, line %d: %s",
     67 	    tag, tcpd_context.file, tcpd_context.line, buf2);
     68     else
     69 	syslog(severity, "%s: %s", tag, buf2);
     70 
     71     if (buf != fmt)
     72         free(buf);
     73     if (buf2 != buf)
     74 	free(buf2);
     75 }
     76 
     77 /* tcpd_warn - report problem of some sort and proceed */
     78 
     79 void
     80 tcpd_warn(const char *format, ...)
     81 {
     82     va_list ap;
     83 
     84     va_start(ap, format);
     85     tcpd_diag(LOG_ERR, "warning", format, ap);
     86     va_end(ap);
     87 }
     88 
     89 /* tcpd_jump - report serious problem and jump */
     90 
     91 void
     92 tcpd_jump(const char *format, ...)
     93 {
     94     va_list ap;
     95 
     96     va_start(ap, format);
     97     tcpd_diag(LOG_ERR, "error", format, ap);
     98     va_end(ap);
     99     longjmp(tcpd_buf, AC_ERROR);
    100 }
    101