/*      $OpenBSD: printconf.c,v 1.6 2023/11/25 13:00:05 florian Exp $   */

/*
 * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
 * Copyright (c) 2004, 2005 Esben Norby <norby@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 <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <arpa/inet.h>

#include <event.h>
#include <imsg.h>
#include <stdio.h>
#include <stdlib.h>
#include <vis.h>

#include "dhcpleased.h"
#include "log.h"

void    print_dhcp_options(char *, uint8_t *, int);

void
print_dhcp_options(char *indent, uint8_t *p, int len)
{
        static char      buf[4 * 1500 + 1];
        int              rem, i;
        uint8_t          dho, dho_len;

        rem = len;

        while (rem > 0) {
                dho = *p;
                p += 1;
                rem -= 1;

                if (rem == 0)
                        fatal("dhcp option too short");
                dho_len = *p;
                p += 1;
                rem -= 1;
                if (rem < dho_len)
                        fatal("dhcp option too short: %d %d", rem, dho_len);

                switch (dho) {
                case DHO_DHCP_CLASS_IDENTIFIER:
                        strvisx(buf, p, dho_len, VIS_DQ | VIS_CSTYLE);
                        p += dho_len;
                        rem -= dho_len;
                        printf("%ssend vendor class id \"%s\"\n", indent, buf);
                        break;
                case DHO_DHCP_CLIENT_IDENTIFIER:
                        if (dho_len < 1)
                                fatal("dhcp option too short");
                        switch (*p) {
                        case HTYPE_ETHER:
                                printf("%ssend client id \"", indent);
                                for (i = 0; i < dho_len; i++)
                                        printf("%s%02x", i != 0? ":" : "",
                                            *(p + i));
                                printf("\"\n");
                                break;
                        default:
                                strvisx(buf, p, dho_len, VIS_DQ | VIS_CSTYLE);
                                printf("%ssend client id \"%s\"\n",
                                    indent, buf);
                                break;
                        }
                        p += dho_len;
                        rem -= dho_len;
                        break;
                default:
                        fatal("unknown dhcp option: %d [%d]", *p, rem);
                        break;
                }
        }
}

void
print_config(struct dhcpleased_conf *conf)
{
        struct iface_conf       *iface;
        int                      i;
        char                     hbuf[INET_ADDRSTRLEN];

        SIMPLEQ_FOREACH(iface, &conf->iface_list, entry) {
                printf("interface %s {\n", iface->name);
                print_dhcp_options("\t", iface->c_id, iface->c_id_len);
                if (iface->h_name != NULL) {
                        if (iface->h_name[0] == '\0')
                                printf("\tsend no host name\n");
                        else {
                                printf("\tsend host name \"%s\"\n",
                                    iface->h_name);
                        }
                }
                print_dhcp_options("\t", iface->vc_id, iface->vc_id_len);
                if (iface->ignore & IGN_DNS)
                        printf("\tignore dns\n");
                if (iface->ignore & IGN_ROUTES)
                        printf("\tignore routes\n");
                for (i = 0; i < iface->ignore_servers_len; i++) {
                        if (inet_ntop(AF_INET, &iface->ignore_servers[i],
                            hbuf, sizeof(hbuf)) == NULL)
                                continue;
                        printf("\tignore %s\n", hbuf);

                }
                if (iface->prefer_ipv6)
                        printf("\tprefer ipv6\n");
                printf("}\n");
        }
}