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/*++
/* NAME
/* postlog 1
/* SUMMARY
/* Postfix-compatible logging utility
/* SYNOPSIS
/* .fi
/* \fBpostlog\fR [\fB-i\fR] [\fB-p \fIpriority\fB] [\fB-t \fItag\fR]
/* [\fB-v\fR] [\fItext...\fR]
/* DESCRIPTION
/* The \fBpostlog\fR command implements a Postfix-compatible logging
/* interface for use in, for example, shell scripts.
/*
/* By default, \fBpostlog\fR logs the \fItext\fR given on the command
/* line as one record. If no \fItext\fR is specified on the command
/* line, \fBpostlog\fR reads from standard input and logs each input
/* line as one record.
/*
/* Logging is sent to \fBsyslogd\fR(8); when the standard error stream
/* is connected to a terminal, logging is sent there as well.
/*
/* The following options are implemented:
/* .IP \fB-i\fR
/* Include the process ID in the logging tag.
/* .IP "\fB-p \fIpriority\fR"
/* Specifies the logging severity: \fBinfo\fR (default), \fBwarn\fR,
/* \fBerror\fR, \fBfatal\fR, or \fBpanic\fR.
/* .IP "\fB-t \fItag\fR"
/* Specifies the logging tag, that is, the identifying name that
/* appears at the beginning of each logging record.
/* .IP \fB-v\fR
/* Enable verbose logging for debugging purposes. Multiple \fB-v\fR
/* options make the software increasingly verbose.
/* SEE ALSO
/* syslogd(8) syslog daemon.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <sys/stat.h>
#include <string.h>
#include <syslog.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/* Utility library. */
#include <msg.h>
#include <vstring.h>
#include <vstream.h>
#include <vstring_vstream.h>
#include <msg_output.h>
#include <msg_vstream.h>
#include <msg_syslog.h>
/* Global library. */
#include <mail_params.h> /* XXX right place for LOG_FACILITY? */
/* Application-specific. */
/*
* Support for the severity level mapping.
*/
struct level_table {
char *name;
int level;
};
static struct level_table level_table[] = {
"info", MSG_INFO,
"warn", MSG_WARN,
"warning", MSG_WARN,
"error", MSG_ERROR,
"err", MSG_ERROR,
"fatal", MSG_FATAL,
"crit", MSG_FATAL,
"panic", MSG_PANIC,
0,
};
/* level_map - lookup facility or severity value */
static int level_map(char *name)
{
struct level_table *t;
for (t = level_table; t->name; t++)
if (strcasecmp(t->name, name) == 0)
return (t->level);
msg_fatal("bad severity: \"%s\"", name);
}
/* log_argv - log the command line */
static void log_argv(int level, char **argv)
{
VSTRING *buf = vstring_alloc(100);
while (*argv) {
vstring_strcat(buf, *argv++);
if (*argv)
vstring_strcat(buf, " ");
}
msg_text(level, vstring_str(buf));
vstring_free(buf);
}
/* log_stream - log lines from a stream */
static void log_stream(int level, VSTREAM *fp)
{
VSTRING *buf = vstring_alloc(100);
while (vstring_get_nonl(buf, fp) != VSTREAM_EOF)
msg_text(level, vstring_str(buf));
vstring_free(buf);
}
/* main - logger */
int main(int argc, char **argv)
{
struct stat st;
char *slash;
int fd;
int ch;
char *tag;
int log_flags = 0;
int level = MSG_INFO;
/*
* Be consistent with file permissions.
*/
umask(022);
/*
* To minimize confusion, make sure that the standard file descriptors
* are open before opening anything else. XXX Work around for 44BSD where
* fstat can return EBADF on an open file descriptor.
*/
for (fd = 0; fd < 3; fd++)
if (fstat(fd, &st) == -1
&& (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
msg_fatal("open /dev/null: %m");
/*
* Set up diagnostics.
*/
if ((slash = strrchr(argv[0], '/')) != 0)
tag = slash + 1;
else
tag = argv[0];
if (isatty(STDERR_FILENO))
msg_vstream_init(tag, VSTREAM_ERR);
msg_syslog_init(tag, LOG_PID, LOG_FACILITY);
/*
* Parse switches.
*/
while ((ch = GETOPT(argc, argv, "c:ip:t:v")) > 0) {
switch (ch) {
default:
msg_fatal("usage: %s [-i] [-p priority] [-t tag] [-v] text", tag);
break;
case 'i':
log_flags |= LOG_PID;
break;
case 'p':
level = level_map(optarg);
break;
case 't':
tag = optarg;
break;
case 'v':
msg_verbose++;
break;
}
}
/*
* Re-initialize the logging, this time with the user-specified tag and
* severity level.
*/
if (isatty(STDERR_FILENO))
msg_vstream_init(tag, VSTREAM_ERR);
msg_syslog_init(tag, log_flags, LOG_FACILITY);
/*
* Log the command line or log lines from standard input.
*/
if (argc > optind) {
log_argv(level, argv + optind);
} else {
log_stream(level, VSTREAM_IN);
}
exit(0);
}
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