/*      $OpenBSD: parent.c,v 1.1 2026/06/11 15:41:33 bluhm Exp $        */

/*
 * Copyright (c) 2026 Alexander Bluhm <bluhm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <err.h>
#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>

#include "log.h"
#include "syslogd.h"

static int       verbose;
static char     *debug_ebuf;

/* parent process is re-execed with reduced arguments, others ignored */

static __dead void
usage(void)
{
        (void)fprintf(stderr,
            "usage: syslogd-parent [-dn] [-f config_file] -P child_pid\n");
        exit(1);
}

int
main(int argc, char *argv[])
{
        char *ConfFile = _PATH_LOGCONF;
        int Debug = 0;
        int PrivChild = 0;
        int NoDNS = 0;
        const char *errstr;
        int ch;

        while ((ch = getopt(argc, argv,
            "46a:C:c:dFf:hK:k:m:nP:p:rS:s:T:U:uVZ")) != -1) {
                switch (ch) {
                case '4':
                case '6':
                case 'a':
                case 'C':
                case 'c':
                case 'd':               /* debug */
                        Debug++;
                        break;
                case 'F':
                        break;
                case 'f':               /* configuration file */
                        ConfFile = optarg;
                        break;
                case 'h':
                case 'K':
                case 'k':
                case 'm':
                        break;
                case 'n':               /* don't do DNS lookups */
                        NoDNS = 1;
                        break;
                case 'P':               /* used internally, exec the parent */
                        PrivChild = strtonum(optarg, 2, INT_MAX, &errstr);
                        if (errstr)
                                errx(1, "priv child %s: %s", errstr, optarg);
                        break;
                case 'p':
                case 'r':
                case 'S':
                case 's':
                case 'T':
                case 'U':
                case 'u':
                case 'V':
                case 'Z':
                        break;
                default:
                        usage();
                }
        }
        if (argc != optind)
                usage();
        if (PrivChild < 2)
                errx(1, "parent requires -P child_pid");

        log_init(Debug, LOG_SYSLOG);
        priv_exec(ConfFile, NoDNS, PrivChild, argc, argv);

        /* NOTREACHED */
        return 1;
}

void
log_init(int n_debug, int fac)
{
        verbose = n_debug;

        if (debug_ebuf == NULL)
                if ((debug_ebuf = malloc(ERRBUFSIZE)) == NULL)
                    err(1, "allocate debug buffer");
        debug_ebuf[0] = '\0';
}

void
log_debug(const char *emsg, ...)
{
        va_list ap;
        int saved_errno;

        if (verbose) {
                saved_errno = errno;
                va_start(ap, emsg);
                vsnprintf(debug_ebuf, ERRBUFSIZE, emsg, ap);
                fprintf(stderr, "[priv]: %s\n", debug_ebuf);
                fflush(stderr);
                va_end(ap);
                errno = saved_errno;
        }
        debug_ebuf[0] = '\0';
}