1 /* $NetBSD: diag.c,v 1.18 2024/02/09 22:08:31 andvar 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 1.18 2024/02/09 22:08:31 andvar 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 #include "expandm.h"
37
38 struct tcpd_context tcpd_context;
39 jmp_buf tcpd_buf;
40
41 static void tcpd_diag(int, const char *, const char *, va_list)
42 __sysloglike(3,0);
43
44 /* tcpd_diag - centralize error reporter */
45
46 static void
tcpd_diag(int severity,const char * tag,const char * fmt,va_list ap)47 tcpd_diag(int severity, const char *tag, const char *fmt, va_list ap)
48 {
49 char *buf, *bufx;
50
51 if (vasprintf(&buf, expandm(fmt, NULL, &bufx), ap) == -1)
52 buf = __UNCONST(fmt);
53 free(bufx);
54
55 /* construct the tag for the log entry */
56 if (tcpd_context.file)
57 syslog(severity, "%s: %s, line %d: %s",
58 tag, tcpd_context.file, tcpd_context.line, buf);
59 else
60 syslog(severity, "%s: %s", tag, buf);
61
62 if (buf != fmt)
63 free(buf);
64 }
65
66 /* tcpd_warn - report problem of some sort and proceed */
67
68 void
tcpd_warn(const char * format,...)69 tcpd_warn(const char *format, ...)
70 {
71 va_list ap;
72
73 va_start(ap, format);
74 tcpd_diag(LOG_ERR, "warning", format, ap);
75 va_end(ap);
76 }
77
78 /* tcpd_jump - report serious problem and jump */
79
80 void
tcpd_jump(const char * format,...)81 tcpd_jump(const char *format, ...)
82 {
83 va_list ap;
84
85 va_start(ap, format);
86 tcpd_diag(LOG_ERR, "error", format, ap);
87 va_end(ap);
88 longjmp(tcpd_buf, AC_ERROR);
89 }
90