/*      $OpenBSD: src/sbin/dhclient/errwarn.c,v 1.17 2009/11/26 23:14:29 krw Exp $      */

/* Errors and warnings... */

/*
 * Copyright (c) 1996 The Internet Software Consortium.
 * All Rights Reserved.
 * Copyright (c) 1995 RadioMail Corporation.  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. Neither the name of RadioMail Corporation, the Internet Software
 *    Consortium 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 RADIOMAIL CORPORATION, THE INTERNET
 * SOFTWARE CONSORTIUM 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 RADIOMAIL CORPORATION 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.
 *
 * This software was written for RadioMail Corporation by Ted Lemon
 * under a contract with Vixie Enterprises.   Further modifications have
 * been made for the Internet Software Consortium under a contract
 * with Vixie Laboratories.
 */

#include <sys/types.h>
#include <sys/uio.h>

#include <errno.h>
#include <unistd.h>

#include "dhcpd.h"

static void do_percentm(char *obuf, size_t size, char *ibuf);

static char mbuf[1024];
static char fbuf[1024];

int warnings_occurred;

/*
 * Log an error message, then exit.
 */
void
error(char *fmt, ...)
{
        va_list list;

        do_percentm(fbuf, sizeof(fbuf), fmt);

        va_start(list, fmt);
        vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
        va_end(list);

#ifndef DEBUG
        syslog(LOG_ERR, "%s", mbuf);
#endif

        /* Also log it to stderr? */
        if (log_perror) {
                write(STDERR_FILENO, mbuf, strlen(mbuf));
                write(STDERR_FILENO, "\n", 1);
        }

        if (log_perror) {
                fflush(stderr);
        }
        exit(1);
}

/*
 * Log a warning message...
 */
int
warning(char *fmt, ...)
{
        va_list list;

        do_percentm(fbuf, sizeof(fbuf), fmt);

        va_start(list, fmt);
        vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
        va_end(list);

#ifndef DEBUG
        syslog(LOG_ERR, "%s", mbuf);
#endif

        if (log_perror) {
                write(STDERR_FILENO, mbuf, strlen(mbuf));
                write(STDERR_FILENO, "\n", 1);
        }

        return (0);
}

/*
 * Log a note...
 */
int
note(char *fmt, ...)
{
        va_list list;

        do_percentm(fbuf, sizeof(fbuf), fmt);

        va_start(list, fmt);
        vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
        va_end(list);

#ifndef DEBUG
        syslog(LOG_INFO, "%s", mbuf);
#endif

        if (log_perror) {
                write(STDERR_FILENO, mbuf, strlen(mbuf));
                write(STDERR_FILENO, "\n", 1);
        }

        return (0);
}

#ifdef DEBUG
/*
 * Log a debug message...
 */
int
debug(char *fmt, ...)
{
        va_list list;

        do_percentm(fbuf, sizeof(fbuf), fmt);

        va_start(list, fmt);
        vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
        va_end(list);

        syslog(LOG_DEBUG, "%s", mbuf);

        if (log_perror) {
                write(STDERR_FILENO, mbuf, strlen(mbuf));
                write(STDERR_FILENO, "\n", 1);
        }

        return (0);
}
#endif
/*
 * Find %m in the input string and substitute an error message string.
 */
static void
do_percentm(char *obuf, size_t size, char *ibuf)
{
        char ch;
        char *s = ibuf;
        char *t = obuf;
        int prlen;
        ssize_t fmt_left;
        int saved_errno = errno;

        /*
         * We wouldn't need this mess if printf handled %m, or if
         * strerror() had been invented before syslog().
         */
        for (fmt_left = size; (ch = *s); ++s) {
                if (ch == '%' && s[1] == 'm') {
                        ++s;
                        prlen = snprintf(t, fmt_left, "%s",
                            strerror(saved_errno));
                        if (prlen == -1)
                                prlen = 0;
                        else if (prlen >= fmt_left)
                                prlen = fmt_left - 1;
                        t += prlen;
                        fmt_left -= prlen;
                } else {
                        if (fmt_left > 1) {
                                *t++ = ch;
                                fmt_left--;
                        }
                }
        }
        *t = '\0';
}

int
parse_warn(char *fmt, ...)
{
        va_list list;
        static char spaces[] =
            "                                        "
            "                                        "; /* 80 spaces */
        struct iovec iov[6];
        size_t iovcnt;

        do_percentm(mbuf, sizeof(mbuf), fmt);
        snprintf(fbuf, sizeof(fbuf), "%s line %d: %s", tlname, lexline, mbuf);
        va_start(list, fmt);
        vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
        va_end(list);

#ifndef DEBUG
        syslog(LOG_ERR, "%s", mbuf);
        syslog(LOG_ERR, "%s", token_line);
        if (lexchar < 81)
                syslog(LOG_ERR, "%*c", lexchar, '^');
#endif

        if (log_perror) {
                iov[0].iov_base = mbuf;
                iov[0].iov_len = strlen(mbuf);
                iov[1].iov_base = "\n";
                iov[1].iov_len = 1;
                iov[2].iov_base = token_line;
                iov[2].iov_len = strlen(token_line);
                iov[3].iov_base = "\n";
                iov[3].iov_len = 1;
                iovcnt = 4;
                if (lexchar < 81) {
                        iov[4].iov_base = spaces;
                        iov[4].iov_len = lexchar - 1;
                        iov[5].iov_base = "^\n";
                        iov[5].iov_len = 2;
                        iovcnt += 2;
                }
                writev(STDERR_FILENO, iov, iovcnt);
        }
        warnings_occurred = 1;
        return (0);
}