logger.c

Util-linux 软件包包含许多工具。其中比较重要的是加载、卸载、格式化、分区和管理硬盘驱动器

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * 1999-02-22 Arkadiusz Mi秌iewicz <[e-mail]>
 * - added Native Language Support
 * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <[e-mail]>
 * - fixed strerr(errno) in gettext calls
 */

#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "nls.h"

#define	SYSLOG_NAMES
#include <syslog.h>

int	decode __P((char *, CODE *));
int	pencode __P((char *));
void	usage __P((void));

static int optd = 0;

static int
myopenlog(const char *sock) {
       int fd;
       static struct sockaddr_un s_addr; /* AF_UNIX address of local logger */

       if (strlen(sock) >= sizeof(s_addr.sun_path)) {
	       printf ("logger: openlog: pathname too long\n");
	       exit(1);
       }

       s_addr.sun_family = AF_UNIX;
       (void)strcpy(s_addr.sun_path, sock);

       if ((fd = socket(AF_UNIX, optd ? SOCK_DGRAM : SOCK_STREAM, 0)) == -1) {
               printf ("socket: %s.\n", strerror(errno));
               exit (1);
       }

       if (connect(fd, (struct sockaddr *) &s_addr, sizeof(s_addr)) == -1) {
               printf ("connect: %s.\n", strerror(errno));
               exit (1);
       }
       return fd;
}

static void
mysyslog(int fd, int logflags, int pri, char *tag, char *msg) {
       char buf[1000], pid[30], *cp, *tp;
       time_t now;

       if (fd > -1) {
	       /* avoid snprintf - it does not exist on ancient systems */
               if (logflags & LOG_PID)
                       sprintf (pid, "[%d]", getpid());
	       else
		       pid[0] = 0;
               if (tag)
		       cp = tag;
	       else {
		       cp = getlogin();
		       if (!cp)
			       cp = "<someone>";
	       }
               (void)time(&now);
	       tp = ctime(&now)+4;

	       /* do snprintf by hand - ugly, but for once... */
               sprintf(buf, "<%d>%.15s %.200s%s: %.400s",
			pri, tp, cp, pid, msg);

               if (write(fd, buf, strlen(buf)+1) < 0)
                       return; /* error */
       }
}

/*
 * logger -- read and log utility
 *
 *	Reads from an input and arranges to write the result on the system
 *	log.
 */
int
main(int argc, char **argv) {
	int ch, logflags, pri;
	char *tag, buf[1024];
	char *usock = NULL;
	int LogSock = -1;

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	tag = NULL;
	pri = LOG_NOTICE;
	logflags = 0;
	while ((ch = getopt(argc, argv, "f:ip:st:u:d")) != -1)
		switch((char)ch) {
		case 'f':		/* file to log */
			if (freopen(optarg, "r", stdin) == NULL) {
				int errsv = errno;
				(void)fprintf(stderr, _("logger: %s: %s.\n"),
				    optarg, strerror(errsv));
				exit(1);
			}
			break;
		case 'i':		/* log process id also */
			logflags |= LOG_PID;
			break;
		case 'p':		/* priority */
			pri = pencode(optarg);
			break;
		case 's':		/* log to standard error */
			logflags |= LOG_PERROR;
			break;
		case 't':		/* tag */
			tag = optarg;
			break;
		case 'u':		/* unix socket */
			usock = optarg;
			break;
		case 'd':
			optd = 1;	/* use datagrams */
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	/* setup for logging */
	if (!usock)
		openlog(tag ? tag : getlogin(), logflags, 0);
	else
		LogSock = myopenlog(usock);

	(void) fclose(stdout);

	/* log input line if appropriate */
	if (argc > 0) {
		register char *p, *endp;
		int len;

		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
			len = strlen(*argv);
			if (p + len > endp && p > buf) {
			    if (!usock)
				syslog(pri, "%s", buf);
			    else
				mysyslog(LogSock, logflags, pri, tag, buf);
				p = buf;
			}
			if (len > sizeof(buf) - 1) {
			    if (!usock)
				syslog(pri, "%s", *argv++);
			    else
				mysyslog(LogSock, logflags, pri, tag, *argv++);
			} else {
				if (p != buf)
					*p++ = ' ';
				bcopy(*argv++, p, len);
				*(p += len) = '\0';
			}
		}
		if (p != buf) {
		    if (!usock)
			syslog(pri, "%s", buf);
		    else
			mysyslog(LogSock, logflags, pri, tag, buf);
		}
	} else
		while (fgets(buf, sizeof(buf), stdin) != NULL) {
		    /* glibc is buggy and adds an additional newline,
		       so we have to remove it here until glibc is fixed */
		    int len = strlen(buf);

		    if (len > 0 && buf[len - 1] == '\n')
			    buf[len - 1] = '\0';

		    if (!usock)
			syslog(pri, "%s", buf);
		    else
			mysyslog(LogSock, logflags, pri, tag, buf);
		}
	if (!usock)
		closelog();
	else
		close(LogSock);
	exit(0);
}

/*
 *  Decode a symbolic name to a numeric value
 */
int
pencode(s)
	register char *s;
{
	char *save;
	int fac, lev;

	for (save = s; *s && *s != '.'; ++s);
	if (*s) {
		*s = '\0';
		fac = decode(save, facilitynames);
		if (fac < 0) {
			(void)fprintf(stderr,
			    _("logger: unknown facility name: %s.\n"), save);
			exit(1);
		}
		*s++ = '.';
	}
	else {
		fac = LOG_USER;
		s = save;
	}
	lev = decode(s, prioritynames);
	if (lev < 0) {
		(void)fprintf(stderr,
		    _("logger: unknown priority name: %s.\n"), save);
		exit(1);
	}
	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}

int
decode(name, codetab)
	char *name;
	CODE *codetab;
{
	register CODE *c;

	if (isdigit(*name))
		return (atoi(name));

	for (c = codetab; c->c_name; c++)
		if (!strcasecmp(name, c->c_name))
			return (c->c_val);

	return (-1);
}

void
usage()
{
	(void)fprintf(stderr,
	    _("usage: logger [-is] [-f file] [-p pri] [-t tag] [-u socket] [ message ... ]\n"));
	exit(1);
}