busybox/sysklogd/logger.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini logger implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
#include "busybox.h"
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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
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#if !defined CONFIG_SYSLOGD
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#define SYSLOG_NAMES
#include <sys/syslog.h>
#else
#include <sys/syslog.h>
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# ifndef __dietlibc__
/* We have to do this since the header file defines static
* structures. Argh.... bad libc, bad, bad...
*/
typedef struct _code {
char *c_name;
int c_val;
} CODE;
extern CODE prioritynames[];
extern CODE facilitynames[];
# endif
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#endif
/* Decode a symbolic name to a numeric value
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* this function is based on code
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Original copyright notice is retained at the end of this file.
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*/
static int decode(char *name, CODE * codetab)
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{
CODE *c;
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if (isdigit(*name))
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return atoi(name);
for (c = codetab; c->c_name; c++) {
if (!strcasecmp(name, c->c_name)) {
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return c->c_val;
}
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}
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return -1;
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}
/* Decode a symbolic name to a numeric value
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* this function is based on code
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Original copyright notice is retained at the end of this file.
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*/
static int pencode(char *s)
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{
char *save;
int lev, fac = LOG_USER;
for (save = s; *s && *s != '.'; ++s);
if (*s) {
*s = '\0';
fac = decode(save, facilitynames);
if (fac < 0)
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bb_error_msg_and_die("unknown facility name: %s", save);
*s++ = '.';
} else {
s = save;
}
lev = decode(s, prioritynames);
if (lev < 0)
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bb_error_msg_and_die("unknown priority name: %s", save);
return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
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}
int logger_main(int argc, char **argv)
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{
unsigned opt;
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char *opt_p, *opt_t;
int pri = LOG_USER | LOG_NOTICE;
int option = 0;
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int c, i;
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char buf[1024], name[128];
/* Fill out the name string early (may be overwritten later) */
bb_getpwuid(name, geteuid(), sizeof(name));
/* Parse any options */
opt = getopt32(argc, argv, "p:st:", &opt_p, &opt_t);
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if (opt & 0x1) pri = pencode(opt_p); // -p
if (opt & 0x2) option |= LOG_PERROR; // -s
if (opt & 0x4) safe_strncpy(name, opt_t, sizeof(name)); // -t
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openlog(name, option, 0);
if (optind == argc) {
do {
/* read from stdin */
i = 0;
while ((c = getc(stdin)) != EOF && c != '\n' &&
i < (sizeof(buf)-1)) {
buf[i++] = c;
}
if (i > 0) {
buf[i++] = '\0';
syslog(pri, "%s", buf);
}
} while (c != EOF);
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} else {
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char *message = NULL;
int len = argc - optind; /* for the space between the args
and '\0' */
opt = len;
argv += optind;
for (i = 0; i < opt; i++) {
len += strlen(*argv);
message = xrealloc(message, len);
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if(!i)
message[0] = '\0';
else
strcat(message, " ");
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strcat(message, *argv);
argv++;
}
syslog(pri, "%s", message);
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}
closelog();
return EXIT_SUCCESS;
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}
/*-
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This is the original license statement for the decode and pencode functions.
*
* 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
*
* 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.
*/