/*      $NetBSD: dump.c,v 1.18 2021/03/23 18:16:53 christos Exp $       */
/*      $KAME: dump.c,v 1.34 2004/06/14 05:35:59 itojun Exp $   */

/*
 * Copyright (C) 2000 WIDE Project.
 * 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 the project 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 PROJECT 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 PROJECT 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.
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>

#include <net/if.h>
#include <net/if_dl.h>
#ifdef __FreeBSD__
#include <net/if_var.h>
#endif

#include <netinet/in.h>

/* XXX: the following two are non-standard include files */
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>

#include <arpa/inet.h>

#include <time.h>
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>

#include "rtadvd.h"
#include "timer.h"
#include "logit.h"
#include "if.h"
#include "dump.h"
#include "prog_ops.h"

static FILE *fp;

static char *ether_str(struct sockaddr_dl *);
static void if_dump(void);

static const char *rtpref_str[] = {
        "medium",               /* 00 */
        "high",                 /* 01 */
        "rsv",                  /* 10 */
        "low"                   /* 11 */
};

static char *
ether_str(struct sockaddr_dl *sdl)
{
        static char hbuf[NI_MAXHOST];

        if (sdl->sdl_alen) {
                if (getnameinfo((struct sockaddr *)sdl, sdl->sdl_len,
                    hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
                        snprintf(hbuf, sizeof(hbuf), "<invalid>");
        } else
                snprintf(hbuf, sizeof(hbuf), "NONE");

        return(hbuf);
}

static void
if_dump(void)
{
        struct rainfo *rai;
        struct prefix *pfx;
        struct rtinfo *rti;
        struct rdnss *rdns;
        struct rdnss_addr *rdnsa;
        struct dnssl *dnsl;
        struct dnssl_domain *dnsd;
        char *p, len;
        char prefixbuf[INET6_ADDRSTRLEN];
        struct timespec now;

        prog_clock_gettime(CLOCK_MONOTONIC, &now); /* XXX: unused in most cases */
        TAILQ_FOREACH(rai, &ralist, next) {
                fprintf(fp, "%s:\n", rai->ifname);

                fprintf(fp, "  Status: %s\n",
                        (rai->ifflags & IFF_UP) ? "UP" : "DOWN");

                /* control information */
                if (rai->lastsent.tv_sec) {
                        /* note that ctime() appends CR by itself */
                        fprintf(fp, "  Last RA sent: %s",
                                ctime(&rai->lastsent.tv_sec));
                }
                if (rai->timer) {
                        fprintf(fp, "  Next RA will be sent: %s",
                                ctime(&rai->timer->tm.tv_sec));
                }
                else
                        fprintf(fp, "  RA timer is stopped");
                fprintf(fp, "  waits: %d, initcount: %d\n",
                        rai->waiting, rai->initcounter);

                /* statistics */
                fprintf(fp, "  statistics: RA(out/in/inconsistent): "
                    "%llu/%llu/%llu, ",
                    (unsigned long long)rai->raoutput,
                    (unsigned long long)rai->rainput,
                    (unsigned long long)rai->rainconsistent);
                fprintf(fp, "RS(input): %llu\n",
                    (unsigned long long)rai->rsinput);

                /* interface information */
                if (rai->advlinkopt)
                        fprintf(fp, "  Link-layer address: %s\n",
                            ether_str(rai->sdl));
                fprintf(fp, "  MTU: %u\n", rai->phymtu);

                /* Router configuration variables */
                fprintf(fp, "  DefaultLifetime: %u, MaxAdvInterval: %u, "
                    "MinAdvInterval: %u\n", rai->lifetime, rai->maxinterval,
                    rai->mininterval);
                fprintf(fp, "  Flags: %s%s%s, ",
                    rai->managedflg ? "M" : "", rai->otherflg ? "O" : "",
                    "");
                fprintf(fp, "Preference: %s, ",
                        rtpref_str[(rai->rtpref >> 3) & 0xff]);
                fprintf(fp, "MTU: %u\n", rai->linkmtu);
                fprintf(fp, "  ReachableTime: %u, RetransTimer: %u, "
                        "CurHopLimit: %u\n", rai->reachabletime,
                        rai->retranstimer, rai->hoplimit);
                if (rai->clockskew)
                        fprintf(fp, "  Clock skew: %usec\n",
                            rai->clockskew);
                TAILQ_FOREACH(pfx, &rai->prefix, next) {
                        if (pfx == TAILQ_FIRST(&rai->prefix))
                                fprintf(fp, "  Prefixes:\n");
                        fprintf(fp, "    %s/%d(",
                            inet_ntop(AF_INET6, &pfx->prefix, prefixbuf,
                            sizeof(prefixbuf)), pfx->prefixlen);
                        switch (pfx->origin) {
                        case PREFIX_FROM_KERNEL:
                                fprintf(fp, "KERNEL, ");
                                break;
                        case PREFIX_FROM_CONFIG:
                                fprintf(fp, "CONFIG, ");
                                break;
                        case PREFIX_FROM_DYNAMIC:
                                fprintf(fp, "DYNAMIC, ");
                                break;
                        }
                        if (pfx->validlifetime == ND6_INFINITE_LIFETIME)
                                fprintf(fp, "vltime: infinity");
                        else
                                fprintf(fp, "vltime: %u", pfx->validlifetime);
                        if (pfx->vltimeexpire != 0)
                                fprintf(fp, "(decr,expire %lld), ", (long long)
                                        (pfx->vltimeexpire > now.tv_sec ?
                                        pfx->vltimeexpire - now.tv_sec : 0));
                        else
                                fprintf(fp, ", ");
                        if (pfx->preflifetime ==  ND6_INFINITE_LIFETIME)
                                fprintf(fp, "pltime: infinity");
                        else
                                fprintf(fp, "pltime: %u", pfx->preflifetime);
                        if (pfx->pltimeexpire != 0)
                                fprintf(fp, "(decr,expire %lld), ", (long long)
                                        (pfx->pltimeexpire > now.tv_sec ?
                                        pfx->pltimeexpire - now.tv_sec : 0));
                        else
                                fprintf(fp, ", ");
                        fprintf(fp, "flags: %s%s%s",
                                pfx->onlinkflg ? "L" : "",
                                pfx->autoconfflg ? "A" : "",
                                "");
                        if (pfx->timer) {
                                struct timespec *rest;

                                rest = rtadvd_timer_rest(pfx->timer);
                                if (rest) { /* XXX: what if not? */
                                        fprintf(fp, ", expire in: %ld",
                                            (long)rest->tv_sec);
                                }
                        }
                        fprintf(fp, ")\n");
                }

                TAILQ_FOREACH(rti, &rai->route, next) {
                        if (rti == TAILQ_FIRST(&rai->route))
                                fprintf(fp, "  Route Information:\n");
                        fprintf(fp, "    %s/%d (",
                                inet_ntop(AF_INET6, &rti->prefix,
                                          prefixbuf, sizeof(prefixbuf)),
                                rti->prefixlen);
                        fprintf(fp, "preference: %s, ",
                                rtpref_str[0xff & (rti->rtpref >> 3)]);
                        if (rti->ltime == ND6_INFINITE_LIFETIME)
                                fprintf(fp, "lifetime: infinity");
                        else
                                fprintf(fp, "lifetime: %ld", (long)rti->ltime);
                        fprintf(fp, ")\n");
                }

                TAILQ_FOREACH(rdns, &rai->rdnss, next) {
                        fprintf(fp, "  Recursive DNS Servers:\n");
                        if (rdns->lifetime == ND6_INFINITE_LIFETIME)
                                fprintf(fp, "    lifetime: infinity\n");
                        else
                                fprintf(fp, "    lifetime: %ld\n",
                                    (long)rdns->lifetime);
                        TAILQ_FOREACH(rdnsa, &rdns->list, next)
                                fprintf(fp, "    %s\n",
                                    inet_ntop(AF_INET6, &rdnsa->addr,
                                    prefixbuf, sizeof(prefixbuf)));
                }

                TAILQ_FOREACH(dnsl, &rai->dnssl, next) {
                        fprintf(fp, "  DNS Search List:\n");
                        if (dnsl->lifetime == ND6_INFINITE_LIFETIME)
                                fprintf(fp, "    lifetime: infinity\n");
                        else
                                fprintf(fp, "    lifetime: %ld\n",
                                    (long)dnsl->lifetime);
                        TAILQ_FOREACH(dnsd, &dnsl->list, next) {
                                fprintf(fp, "    ");
                                for (p = dnsd->domain, len = *p++;
                                    len != 0;
                                    len = *p++)
                                {
                                        if (p != dnsd->domain)
                                            fputc('.', fp);
                                        while(len-- != 0)
                                            fputc(*p++, fp);
                                }
                                fputc('\n', fp);
                        }
                }
        }
}

void
rtadvd_dump_file(const char *dumpfile)
{
        logit(LOG_DEBUG, "%s: dump current status to %s", __func__,
            dumpfile);

        if ((fp = fopen(dumpfile, "w")) == NULL) {
                logit(LOG_WARNING, "%s: open a dump file(%s): %m",
                       __func__, dumpfile);
                return;
        }

        if_dump();

        fclose(fp);
}