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static const char rcsid[] = "$Id: error.c,v 1.79 2007/03/07 00:23:27 will Exp $";
/*
* Copyright (c) 1993 by California Institute of Technology.
* Written by William Deich. Not derived from licensed software.
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*/
/********************************************************************/
/*
* If you don't have localsys.h, supply the following:
* #define HAVE_STDARG_H if you have <stdarg.h> (ie ANSI C variadic arg lists)
* #define HAVE_SYSLOG_H if you have <syslog.h> and syslog() function
*/
/*
* If you don't like the following "priority" and "facility" values for
* use with syslog(), supply the following:
* #define SYSLOG_PRIORITY nnn ...priority for logging if syslog() use is
* enabled; default is LOG_ERR.
* #define SYSLOG_FACILITY nnn ...syslog() facility code if syslog() use is
* enabled; default is LOG_USER.
* We call Strerror(e) to return error messages for error code e. This
* routine is expected to simply be strerror(e) + wrapper code to ensure
* that e is in the valid range.
*/
#include "localsys.h"
/********************************************************************/
/* Error -- print error message, then optionally die.
* Usage: Error(show_perror, die, format, args... );
* Print error message according to format & args.
* If show_perror != 0 && errno != 0, follow error message with perror("").
* (If show_perror !=0, but errno==0, follow error msg with "\n").
* If die != 0, exit with exit(die).
* There are several external variables that a calling program can modify:
* error_prog: program name preceding msgs to stderr. Default off.
* error_log_prog: program name preceding msgs to logfile. Default off.
* error_stderr: controls whether messages go to stderr. Default enabled.
* error_logfile: controls whether messages go to a logfile. Default off.
* error_command: controls whether msgs go to a popen'd command. Def off.
* error_syslog: controls whether messages go to [r]syslog. Default: off.
* error_rlog_host: host to receive rsyslog() messages. Def: ourselves.
* error_user: Controls username used when printing messages.
* error_tag: Controls use of error_{srcfile,line,nl}. Default off.
* error_fflush: fflush(stdout) before printing error message. Default on.
* error_srcfile, error_line, error_nl: error_srcfile is a file in
* which an error was found, starting at line error_line
* and continuing over error_nl lines.
* error_counter: incremented with every call to Error().
* In detail:
* If error_prog != NULL, then the message to stderr is preceded
* with "<error_prog>: ".
* If error_stderr == 0, then the message is NOT directed to stderr.
* By default error_stderr == 1.
* If error_logfile != NULL, then the message is also directed to
* that file, preceded with
* error_log_prog: user@hostname timestamp
* If error_log_prog is NULL, it isn't printed. We keep separate
* error_prog and error_log_prog so that the program name can be
* printed on stderr (where there might otherwise be confusion to the
* user about which program it is) but optionally not printed in the
* logfile, which is typically unique to the program, so that the
* program name is redundant.
* If error_user != NULL, then the username used in messages is error_user,
* instead of the default name found by looking at the user's password
* entry.
* If error_command != NULL and *error_command != '\0', then error_command
* is popen'd and the message is piped in. If the popen fails, Error()
* is silent about the problem. NOTE: the command is executed separately
* for each call to this routine.
* If HAVE_SYSLOG_H is defined, and the caller sets error_syslog != 0,
* then the message is passed to [r]syslog(), at priority error_priority,
* using facility error_facility. We compile with rsyslog, but if the
* remote host argument is NULL at the time we open the log, we use the
* syslog routines instead.
* The fmt string and the printf output must be less
* than MAXPRINT characters each. This is because syslog() accepts a
* printf-style variadic argument list, but it doesn't have a va_list
* version. Therefore we print into a string and pass that onto syslog().
* As a side effect, you can't use syslog-specific "%m" in the fmt.
* If the error_prog string is non-null, then just before the first
* call to syslog, openlog is called with an ident string = error_prog.
* Note that this is done just once: you can't change error_prog
* between messages.
* If error_tag is !0, or if the _first_ two characters of the output
* format are "%t", then the output is preceded with a message like
* the following:
* (a) error_srcfile == NULL:
* "" # error_line <= 0
* "line %d: " # error_line > 0, error_nl <= 1
* "lines %d..%d: " # error_line > 0, error_nl > 1
*
* (b) error_srcfile == "-":
* "in <stdin>: " # error_line <= 0
* "line %d in <stdin>: " # error_line > 0, error_nl <= 1
* "lines %d..%d in <stdin>: " # error_line > 0, error_nl > 1
* (c) error_srcfile == anothername:
* "in file `%s': " # error_line <= 0
* "line %d in file `%s': " # error_line > 0, error_nl <= 1
* "lines %d..%d in file `%s': " # error_line > 0, error_nl > 1
* Notes:
* 1. If error_prog and this line information is printed, then
* the program name is _not_ suffixed with ":" -- that way, the
* output looks something like:
* progxyz (lines 232..255 in file `.......'): errmsg
* 2. In the event that the first two characters are "%t", they enable
* tagline printing but are not printed.
* Return code is -1, so you can print error messages and return an error
* code with return Error(...);
*/
FILE *error_logfile = NULL;
char *error_prog = NULL;
char *error_log_prog = NULL;
char *error_command = NULL;
char *error_user = NULL;
int error_counter = 0;
int error_stderr = 1;
int error_syslog = 0;
char *error_rlog_host = NULL;
int error_line = -1;
int error_nl = -1;
char *error_srcfile = NULL;
int error_tag = 0;
int error_fflush = 1;
#ifdef HAVE_SYSLOG_H
/* Default error priority */
#ifndef SYSLOG_PRIORITY
#define SYSLOG_PRIORITY LOG_ERR
#endif
/* Default error facility */
#ifndef SYSLOG_FACILITY
#ifdef LOG_USER
#define SYSLOG_FACILITY LOG_USER
#else
#define SYSLOG_FACILITY 0
#endif
#endif
void ropenlog P__(( char *ident, int logopt, int facility, char *host ));
void rsyslog P__(( unsigned int level, char *fmt, ... ));
int error_priority = SYSLOG_PRIORITY;
int error_facility = SYSLOG_FACILITY;
int openlog_done = 0;
static int using_rsyslog = 0;
void
OpenLog(prog, opt, fac)
char *prog;
int opt;
int fac;
{
if (error_rlog_host != NULL) {
ropenlog(prog, opt, fac, error_rlog_host);
using_rsyslog = 1;
} else {
openlog(prog, opt, fac);
using_rsyslog = 0;
}
}
void
SysLog(pri, buf)
int pri;
char *buf;
{
if (using_rsyslog) {
rsyslog(pri, "%s", buf);
} else {
syslog(pri, "%s", buf);
}
}
#endif
static int uid = -1;
static char user[128] = "";
static char hostname[1024] = "";
extern char *Strerror();
#define MAXPRINT 1300
#define StrLCat(s1, s2, maxlen) strncat(s1, s2, ((maxlen) - strlen(s1) - 1))
char *taglines();
#ifdef HAVE_STDARG_H
/* VARARGS3 */
int
Error(
int show_perror, /* If errno != 0, follow msg with perror("") */
int die, /* If !0, exit with exit(die) */
char *fmt, /* Print rest of args with fprintf(stderr, fmt, ...) */
... )
{
va_list ap;
int error;
FILE *error_cmd = NULL;
char *tag;
int pctt;
if (error_fflush)
fflush(stdout);
error = errno;
error_counter++;
/* Figure out line tagging */
pctt = strncmp(fmt, "%t", 2) == 0;
tag = ( pctt || error_tag ) ? taglines(3) : NULL;
if (pctt)
fmt += 2;
/* Program name */
if (error_stderr && error_prog)
(void) fprintf(stderr, "%s%s ", error_prog, (tag && *tag) ? "" : ":");
if (error_command && *error_command)
error_cmd = popen(error_command, "w");
if (error_log_prog) {
if (error_logfile)
(void) fprintf(error_logfile, "%s%s ", error_log_prog,
(tag && *tag) ? "" : ":");
if (error_cmd)
(void) fprintf(error_cmd, "%s%s ", error_log_prog,
(tag && *tag) ? "" : ":");
}
if (error_logfile || error_syslog || error_command) {
if (getuid() != uid || *user == '\0') {
struct passwd *pw;
int e = errno;
pw = getpwuid((uid=getuid()));
if (pw) (void) strcpy(user, pw->pw_name);
errno = e;
}
}
if (error_logfile || error_cmd) {
/* user@hostname & timestamp */
char *s;
time_t tptr;
if (*hostname == '\0')
(void) gethostname(hostname, sizeof(hostname));
(void) time(&tptr);
s = ctime(&tptr);
s[strlen(s) - 1] = '\0';
if (error_logfile)
(void) fprintf(error_logfile, "%s@%s %s\t",
error_user ? error_user : user,
hostname, s);
if (error_cmd)
(void) fprintf(error_cmd, "%s@%s %s\t",
error_user ? error_user : user,
hostname, s);
}
if (error_stderr) {
if (tag)
(void) fputs(tag, stderr);
/* User's msg */
va_start(ap, fmt);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (error_logfile) {
if (tag)
(void) fputs(tag, error_logfile);
/* User's msg */
va_start(ap, fmt);
(void) vfprintf(error_logfile, fmt, ap);
va_end(ap);
}
if (error_cmd) {
if (tag)
(void) fputs(tag, error_cmd);
/* User's msg */
va_start(ap, fmt);
(void) vfprintf(error_cmd, fmt, ap);
va_end(ap);
}
if (show_perror) {
if (error) {
errno = error;
if (error_stderr)
perror("");
if (error_logfile) {
(void) fprintf(error_logfile, "%s\n", Strerror(error));
}
if (error_cmd) {
(void) fprintf(error_cmd, "%s\n", Strerror(error));
}
} else {
if (error_stderr)
(void) fputc('\n', stderr);
if (error_logfile)
(void) fputc('\n', error_logfile);
if (error_cmd)
(void) fputc('\n', error_cmd);
}
}
#ifdef HAVE_SYSLOG_H
if (error_syslog) {
char newfmt[MAXPRINT], buf[MAXPRINT];
if (!openlog_done) {
OpenLog(error_prog ? error_prog : "", 0, error_facility);
openlog_done = 1;
}
sprintf(newfmt, "(%s) ", error_user ? error_user : user);
StrLCat(newfmt, fmt, sizeof(newfmt));
if (tag)
StrLCat(newfmt, tag, sizeof(newfmt));
va_start(ap, fmt);
(void) vsprintf(buf, newfmt, ap);
va_end(ap);
SysLog(error_priority, buf);
}
#endif
if (die)
(void) exit(die);
if (error_cmd)
pclose(error_cmd);
return -1;
}
#else
/* VARARGS3 */
int
Error( va_alist )
va_dcl
{
va_list ap;
int die, show_perror;
char *fmt, *orig_fmt;
int error;
char *tag;
int pctt;
FILE *error_cmd = NULL;
if (error_fflush)
fflush(stdout);
error = errno;
/* Figure out line tagging */
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
fmt = va_arg(ap, char *);
va_end(ap);
pctt = strncmp(fmt, "%t", 2) == 0;
tag = ( pctt || error_tag ) ? taglines(3) : NULL;
if (pctt)
fmt += 2;
/* Program name */
if (error_stderr && error_prog)
(void) fprintf(stderr, "%s%s ", error_prog, (tag && *tag) ? "" : ":");
if (error_command && *error_command)
error_cmd = popen(error_command, "w");
if (error_log_prog) {
if (error_logfile)
(void) fprintf(error_logfile, "%s%s ", error_log_prog,
(tag && *tag) ? "" : ":");
if (error_cmd)
(void) fprintf(error_cmd, "%s%s ", error_log_prog,
(tag && *tag) ? "" : ":");
}
if (error_logfile || error_syslog || error_command) {
if (getuid() != uid || *user == '\0') {
struct passwd *pw;
int e = errno;
pw = getpwuid((uid=getuid()));
if (pw) (void) strcpy(user, pw->pw_name);
errno = e;
}
}
if (error_logfile || error_cmd) {
/* user@hostname & timestamp */
char *s;
time_t tptr;
if (*hostname == '\0')
(void) gethostname(hostname, sizeof(hostname));
(void) time(&tptr);
s = ctime(&tptr);
s[strlen(s) - 1] = '\0';
if (error_logfile)
(void) fprintf(error_logfile, "%s@%s %s\t",
error_user ? error_user : user,
hostname, s);
if (error_cmd)
(void) fprintf(error_cmd, "%s@%s %s\t",
error_user ? error_user : user,
hostname, s);
}
if (error_stderr) {
if (tag)
(void) fputs(tag, stderr);
/* User's msg */
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
orig_fmt = va_arg(ap, char *);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (error_logfile) {
if (tag)
(void) fputs(tag, error_logfile);
/* User's msg */
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
orig_fmt = va_arg(ap, char *);
(void) vfprintf(error_logfile, fmt, ap);
va_end(ap);
}
if (error_cmd) {
if (tag)
(void) fputs(tag, error_cmd);
/* User's msg */
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
orig_fmt = va_arg(ap, char *);
(void) vfprintf(error_cmd, fmt, ap);
va_end(ap);
}
/* Figure out if we do show_perror */
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
va_end(ap);
if (show_perror) {
if (error) {
errno = error;
if (error_stderr)
perror("");
if (error_logfile)
(void) fprintf(error_logfile, "%s\n", Strerror(error));
if (error_cmd)
(void) fprintf(error_cmd, "%s\n", Strerror(error));
} else {
if (error_stderr)
(void) fputc('\n', stderr);
if (error_logfile)
(void) fputc('\n', error_logfile);
if (error_cmd)
(void) fputc('\n', error_cmd);
}
}
#ifdef HAVE_SYSLOG_H
if (error_syslog) {
char newfmt[MAXPRINT], buf[MAXPRINT];
va_start(ap);
show_perror = va_arg(ap, int);
die = va_arg(ap, int);
orig_fmt = va_arg(ap, char *);
if (!openlog_done) {
OpenLog(error_prog ? error_prog : "", 0, error_facility);
openlog_done = 1;
}
sprintf(newfmt, "(%s) ", error_user ? error_user : user);
StrLCat(newfmt, fmt, sizeof(newfmt));
if (tag)
StrLCat(newfmt, tag, sizeof(newfmt));
(void) vsprintf(buf, newfmt, ap);
va_end(ap);
SysLog(error_priority, buf);
}
#endif
if (die)
(void) exit(die);
if (error_cmd)
pclose(error_cmd);
return -1;
}
#endif
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* For tagging error text with a prefixing lines indicator. */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
char *
taglines(decorations)
int decorations; /* 1 = enclose in parens; 2 = add a ": "; 3 = both */
{
static char buf[MAXPRINT];
int putparens = decorations & 01;
int putcolon = decorations & 02;
if (error_srcfile == NULL) {
if (error_line <= 0)
return "";
else if (error_nl <= 1)
(void) sprintf(buf, "%sline %d%s%s",
putparens ? "(" : "",
error_line,
putparens ? ")" : "",
putcolon ? ": " : "");
else
(void) sprintf(buf, "%slines %d..%d%s%s",
putparens ? "(" : "",
error_line, error_line + error_nl - 1,
putparens ? ")" : "",
putcolon ? ": " : "");
} else if (strcmp(error_srcfile, "-") == 0) {
if (error_line <= 0)
(void) sprintf(buf, "%sin <stdin>%s%s",
putparens ? "(" : "",
putparens ? ")" : "",
putcolon ? ": " : "");
else if (error_nl <= 1)
(void) sprintf(buf, "%sline %d in <stdin>%s%s",
putparens ? "(" : "",
error_line,
putparens ? ")" : "",
putcolon ? ": " : "");
else
(void) sprintf(buf, "%slines %d..%d in <stdin>%s%s",
putparens ? "(" : "",
error_line, error_line + error_nl - 1,
putparens ? ")" : "",
putcolon ? ": " : "");
} else {
if (error_line <= 0)
(void) sprintf(buf, "%sin file `%s'%s%s",
putparens ? "(" : "",
error_srcfile,
putparens ? ")" : "",
putcolon ? ": " : "");
else if (error_nl <= 1)
(void) sprintf(buf, "%sline %d in file `%s'%s%s",
putparens ? "(" : "",
error_line, error_srcfile,
putparens ? ")" : "",
putcolon ? ": " : "");
else
(void) sprintf(buf, "%slines %d..%d in file `%s'%s%s",
putparens ? "(" : "",
error_line, error_line + error_nl - 1,
error_srcfile,
putparens ? ")" : "",
putcolon ? ": " : "");
}
return buf;
}
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