/* vi: set sw=4 ts=4: */
/*
 * Mini logger implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
//config:config LOGGER
//config:       bool "logger (6.4 kb)"
//config:       default y
//config:       select FEATURE_SYSLOG
//config:       help
//config:       The logger utility allows you to send arbitrary text
//config:       messages to the system log (i.e. the 'syslogd' utility) so
//config:       they can be logged. This is generally used to help locate
//config:       problems that occur within programs and scripts.

//applet:IF_LOGGER(APPLET(logger, BB_DIR_USR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_LOGGER) += syslogd_and_logger.o

//usage:#define logger_trivial_usage
//usage:       "[OPTIONS] [MESSAGE]"
//usage:#define logger_full_usage "\n\n"
//usage:       "Write MESSAGE (or stdin) to syslog\n"
//usage:     "\n        -s      Log to stderr as well as the system log"
//usage:     "\n        -t TAG  Log using the specified tag (defaults to user name)"
//usage:     "\n        -p PRIO Priority (numeric or facility.level pair)"
//usage:
//usage:#define logger_example_usage
//usage:       "$ logger \"hello\"\n"

/*
 * Done in syslogd_and_logger.c:
#include "libbb.h"
#define SYSLOG_NAMES
#define SYSLOG_NAMES_CONST
#include <syslog.h>
*/

/* Decode a symbolic name to a numeric value
 * 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.
 */
static int decode(char *name, const CODE *codetab)
{
        const 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;
}

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

        for (save = s; *s && *s != '.'; ++s)
                ;
        if (*s) {
                *s = '\0';
                fac = decode(save, bb_facilitynames);
                if (fac < 0)
                        bb_error_msg_and_die("unknown %s name: %s", "facility", save);
                *s++ = '.';
        } else {
                s = save;
        }
        lev = decode(s, bb_prioritynames);
        if (lev < 0)
                bb_error_msg_and_die("unknown %s name: %s", "priority", save);
        return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}

#define strbuf bb_common_bufsiz1

int logger_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int logger_main(int argc UNUSED_PARAM, char **argv)
{
        char *str_p, *str_t;
        int opt;
        int i = 0;

        setup_common_bufsiz();

        /* Fill out the name string early (may be overwritten later) */
        str_t = uid2uname_utoa(geteuid());

        /* Parse any options */
        opt = getopt32(argv, "p:st:", &str_p, &str_t);

        if (opt & 0x2) /* -s */
                i |= LOG_PERROR;
        //if (opt & 0x4) /* -t */
        openlog(str_t, i, 0);
        i = LOG_USER | LOG_NOTICE;
        if (opt & 0x1) /* -p */
                i = pencode(str_p);

        argv += optind;
        if (!argv[0]) {
                while (fgets(strbuf, COMMON_BUFSIZE, stdin)) {
                        if (strbuf[0]
                         && NOT_LONE_CHAR(strbuf, '\n')
                        ) {
                                /* Neither "" nor "\n" */
                                syslog(i, "%s", strbuf);
                        }
                }
        } else {
                char *message = NULL;
                int len = 0;
                int pos = 0;
                do {
                        len += strlen(*argv) + 1;
                        message = xrealloc(message, len + 1);
                        sprintf(message + pos, " %s", *argv),
                        pos = len;
                } while (*++argv);
                syslog(i, "%s", message + 1); /* skip leading " " */
        }

        closelog();
        return EXIT_SUCCESS;
}

/* Clean up. Needed because we are included from syslogd_and_logger.c */
#undef strbuf

/*-
 * 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.
 */