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