/*      $OpenBSD: print-ospf.c,v 1.23 2024/04/23 13:34:51 jsg Exp $     */

/*
 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
 */

#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>

#include <ctype.h>
#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"

#include "ospf.h"

struct bits {
        u_int32_t bit;
        const char *str;
};

static const struct bits ospf_option_bits[] = {
        { OSPF_OPTION_T,        "T" },
        { OSPF_OPTION_E,        "E" },
        { OSPF_OPTION_MC,       "MC" },
        { 0,                    NULL }
};

static const struct bits ospf_rla_flag_bits[] = {
        { RLA_FLAG_B,           "B" },
        { RLA_FLAG_E,           "E" },
        { RLA_FLAG_W1,          "W1" },
        { RLA_FLAG_W2,          "W2" },
        { 0,                    NULL }
};

static struct tok type2str[] = {
        { OSPF_TYPE_UMD,        "umd" },
        { OSPF_TYPE_HELLO,      "hello" },
        { OSPF_TYPE_DB,         "dd" },
        { OSPF_TYPE_LSR,        "ls_req" },
        { OSPF_TYPE_LSU,        "ls_upd" },
        { OSPF_TYPE_LSA,        "ls_ack" },
        { 0,                    NULL }
};

static char tstr[] = " [|ospf]";

/* Forwards */
static inline void ospf_print_seqage(u_int32_t, time_t);
static inline void ospf_print_bits(const struct bits *, u_char);
static void ospf_print_ls_type(u_int, const struct in_addr *,
    const struct in_addr *, const char *);
static int ospf_print_lshdr(const struct lsa_hdr *);
static int ospf_print_lsa(const struct lsa *);
static int ospf_decode_v2(const struct ospfhdr *, const u_char *);

static inline void
ospf_print_seqage(u_int32_t seq, time_t us)
{
        time_t sec = us % 60;
        time_t mins = (us / 60) % 60;
        time_t hour = us / 3600;

        printf(" S %X age ", seq);
        if (hour)
                printf("%u:%02u:%02u",
                    (u_int32_t) hour, (u_int32_t) mins, (u_int32_t) sec);
        else if (mins)
                printf("%u:%02u", (u_int32_t) mins, (u_int32_t) sec);
        else
                printf("%u", (u_int32_t) sec);
}


static inline void
ospf_print_bits(const struct bits *bp, u_char options)
{
        char sep = ' ';

        do {
                if (options & bp->bit) {
                        printf("%c%s", sep, bp->str);
                        sep = '/';
                }
        } while ((++bp)->bit);
}

static void
ospf_print_ls_type(u_int ls_type, const struct in_addr *ls_stateid,
    const struct in_addr *ls_router, const char *fmt)
{

        switch (ls_type) {

        case LS_TYPE_ROUTER:
                printf(" rtr %s", ipaddr_string(ls_router));
                break;

        case LS_TYPE_NETWORK:
                printf(" net dr %s if %s",
                    ipaddr_string(ls_router),
                    ipaddr_string(ls_stateid));
                break;

        case LS_TYPE_SUM_IP:
                printf(" sum %s abr %s",
                    ipaddr_string(ls_stateid),
                    ipaddr_string(ls_router));
                break;

        case LS_TYPE_SUM_ABR:
                printf(" abr %s rtr %s",
                    ipaddr_string(ls_router),
                    ipaddr_string(ls_stateid));
                break;

        case LS_TYPE_ASE:
                printf(" ase %s asbr %s",
                    ipaddr_string(ls_stateid),
                    ipaddr_string(ls_router));
                break;

        case LS_TYPE_GROUP:
                printf(" group %s rtr %s",
                    ipaddr_string(ls_stateid),
                    ipaddr_string(ls_router));
                break;

        default:
                putchar(' ');
                printf(fmt, ls_type);
                break;
        }
}

static int
ospf_print_lshdr(const struct lsa_hdr *lshp)
{

        TCHECK(lshp->ls_type);
        printf(" {");                                           /* } (ctags) */

        TCHECK(lshp->ls_options);
        ospf_print_bits(ospf_option_bits, lshp->ls_options);
        TCHECK(lshp->ls_seq);
        ospf_print_seqage(ntohl(lshp->ls_seq), ntohs(lshp->ls_age));
        ospf_print_ls_type(lshp->ls_type, &lshp->ls_stateid, &lshp->ls_router,
            "ls_type %d");

        return (0);
trunc:
        return (1);
}


/*
 * Print a single link state advertisement.  If truncated return 1, else 0.
 */
static int
ospf_print_lsa(const struct lsa *lsap)
{
        const u_char *ls_end;
        const struct rlalink *rlp;
        const struct tos_metric *tosp;
        const struct in_addr *ap;
        const struct aslametric *almp;
        const struct mcla *mcp;
        const u_int32_t *lp;
        int j, k;

        if (ospf_print_lshdr(&lsap->ls_hdr))
                return (1);
        TCHECK(lsap->ls_hdr.ls_length);
        ls_end = (u_char *)lsap + ntohs(lsap->ls_hdr.ls_length);
        switch (lsap->ls_hdr.ls_type) {

        case LS_TYPE_ROUTER:
                TCHECK(lsap->lsa_un.un_rla.rla_flags);
                ospf_print_bits(ospf_rla_flag_bits,
                    lsap->lsa_un.un_rla.rla_flags);

                TCHECK(lsap->lsa_un.un_rla.rla_count);
                j = ntohs(lsap->lsa_un.un_rla.rla_count);
                TCHECK(lsap->lsa_un.un_rla.rla_link);
                rlp = lsap->lsa_un.un_rla.rla_link;
                while (j--) {
                        TCHECK(*rlp);
                        printf(" {");                           /* } (ctags) */
                        switch (rlp->link_type) {

                        case RLA_TYPE_VIRTUAL:
                                printf(" virt");
                                /* FALLTHROUGH */

                        case RLA_TYPE_ROUTER:
                                printf(" nbrid %s if %s",
                                    ipaddr_string(&rlp->link_id),
                                    ipaddr_string(&rlp->link_data));
                                break;

                        case RLA_TYPE_TRANSIT:
                                printf(" dr %s if %s",
                                    ipaddr_string(&rlp->link_id),
                                    ipaddr_string(&rlp->link_data));
                                break;

                        case RLA_TYPE_STUB:
                                printf(" net %s mask %s",
                                    ipaddr_string(&rlp->link_id),
                                    ipaddr_string(&rlp->link_data));
                                break;

                        default:
                                                                /* { (ctags) */
                                printf(" ??RouterLinksType %d?? }",
                                    rlp->link_type);
                                return (0);
                        }
                        printf(" tos 0 metric %d", ntohs(rlp->link_tos0metric));
                        tosp = (struct tos_metric *)
                            ((sizeof rlp->link_tos0metric) + (u_char *) rlp);
                        for (k = 0; k < (int) rlp->link_toscount; ++k, ++tosp) {
                                TCHECK(*tosp);
                                printf(" tos %d metric %d",
                                    tosp->tos_type,
                                    ntohs(tosp->tos_metric));
                        }
                                                                /* { (ctags) */
                        printf(" }");
                        rlp = (struct rlalink *)((u_char *)(rlp + 1) +
                            ((rlp->link_toscount) * sizeof(*tosp)));
                }
                break;

        case LS_TYPE_NETWORK:
                TCHECK(lsap->lsa_un.un_nla.nla_mask);
                printf(" mask %s rtrs",
                    ipaddr_string(&lsap->lsa_un.un_nla.nla_mask));
                ap = lsap->lsa_un.un_nla.nla_router;
                while ((u_char *)ap < ls_end) {
                        TCHECK(*ap);
                        printf(" %s", ipaddr_string(ap));
                        ++ap;
                }
                break;

        case LS_TYPE_SUM_IP:
                TCHECK(lsap->lsa_un.un_nla.nla_mask);
                printf(" mask %s",
                    ipaddr_string(&lsap->lsa_un.un_sla.sla_mask));
                /* FALLTHROUGH */

        case LS_TYPE_SUM_ABR:
                TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
                lp = lsap->lsa_un.un_sla.sla_tosmetric;
                while ((u_char *)lp < ls_end) {
                        u_int32_t ul;

                        TCHECK(*lp);
                        ul = ntohl(*lp);
                        printf(" tos %d metric %d",
                            (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
                            ul & SLA_MASK_METRIC);
                        ++lp;
                }
                break;

        case LS_TYPE_ASE:
                TCHECK(lsap->lsa_un.un_nla.nla_mask);
                printf(" mask %s",
                    ipaddr_string(&lsap->lsa_un.un_asla.asla_mask));

                TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
                almp = lsap->lsa_un.un_asla.asla_metric;
                while ((u_char *)almp < ls_end) {
                        u_int32_t ul;

                        TCHECK(almp->asla_tosmetric);
                        ul = ntohl(almp->asla_tosmetric);
                        printf(" type %d tos %d metric %d",
                            (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1,
                            (ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS,
                            (ul & ASLA_MASK_METRIC));
                        TCHECK(almp->asla_forward);
                        if (almp->asla_forward.s_addr) {
                                printf(" forward %s",
                                    ipaddr_string(&almp->asla_forward));
                        }
                        TCHECK(almp->asla_tag);
                        if (almp->asla_tag) {
                                printf(" tag %u",
                                    ntohl(almp->asla_tag));
                        }
                        ++almp;
                }
                break;

        case LS_TYPE_GROUP:
                /* Multicast extensions as of 23 July 1991 */
                mcp = lsap->lsa_un.un_mcla;
                while ((u_char *)mcp < ls_end) {
                        TCHECK(mcp->mcla_vid);
                        switch (ntohl(mcp->mcla_vtype)) {

                        case MCLA_VERTEX_ROUTER:
                                printf(" rtr rtrid %s",
                                    ipaddr_string(&mcp->mcla_vid));
                                break;

                        case MCLA_VERTEX_NETWORK:
                                printf(" net dr %s",
                                    ipaddr_string(&mcp->mcla_vid));
                                break;

                        default:
                                printf(" ??VertexType %u??",
                                    (u_int32_t)ntohl(mcp->mcla_vtype));
                                break;
                        }
                        ++mcp;
                }
        }

                                                                /* { (ctags) */
        printf(" }");
        return (0);
trunc:
        printf(" }");
        return (1);
}

static int
ospf_decode_v2(const struct ospfhdr *op, const u_char *dataend)
{
        const struct in_addr *ap;
        const struct lsr *lsrp;
        const struct lsa_hdr *lshp;
        const struct lsa *lsap;
        char sep;
        int i;

        switch (op->ospf_type) {

        case OSPF_TYPE_UMD:
                /*
                 * Rob Coltun's special monitoring packets;
                 * do nothing
                 */
                break;

        case OSPF_TYPE_HELLO:
                if (vflag) {
                        TCHECK(op->ospf_hello.hello_deadint);
                        ospf_print_bits(ospf_option_bits,
                            op->ospf_hello.hello_options);
                        printf(" mask %s int %d pri %d dead %u",
                            ipaddr_string(&op->ospf_hello.hello_mask),
                            ntohs(op->ospf_hello.hello_helloint),
                            op->ospf_hello.hello_priority,
                            (u_int32_t)ntohl(op->ospf_hello.hello_deadint));
                }
                TCHECK(op->ospf_hello.hello_dr);
                if (op->ospf_hello.hello_dr.s_addr != 0)
                        printf(" dr %s",
                            ipaddr_string(&op->ospf_hello.hello_dr));
                TCHECK(op->ospf_hello.hello_bdr);
                if (op->ospf_hello.hello_bdr.s_addr != 0)
                        printf(" bdr %s",
                            ipaddr_string(&op->ospf_hello.hello_bdr));
                if (vflag) {
                        printf(" nbrs");
                        ap = op->ospf_hello.hello_neighbor;
                        while ((u_char *)ap < dataend) {
                                TCHECK(*ap);
                                printf(" %s", ipaddr_string(ap));
                                ++ap;
                        }
                }
                break;  /* HELLO */

        case OSPF_TYPE_DB:
                TCHECK(op->ospf_db.db_options);
                ospf_print_bits(ospf_option_bits, op->ospf_db.db_options);
                sep = ' ';
                TCHECK(op->ospf_db.db_flags);
                if (op->ospf_db.db_flags & OSPF_DB_INIT) {
                        printf("%cI", sep);
                        sep = '/';
                }
                if (op->ospf_db.db_flags & OSPF_DB_MORE) {
                        printf("%cM", sep);
                        sep = '/';
                }
                if (op->ospf_db.db_flags & OSPF_DB_MASTER) {
                        printf("%cMS", sep);
                        sep = '/';
                }
                TCHECK(op->ospf_db.db_seq);
                printf(" mtu %u S %X", ntohs(op->ospf_db.db_mtu),
                    (u_int32_t)ntohl(op->ospf_db.db_seq));

                if (vflag) {
                        /* Print all the LS adv's */
                        lshp = op->ospf_db.db_lshdr;

                        while (!ospf_print_lshdr(lshp)) {
                                                        /* { (ctags) */
                                printf(" }");
                                ++lshp;
                        }
                }
                break;

        case OSPF_TYPE_LSR:
                if (vflag) {
                        lsrp = op->ospf_lsr;
                        while ((u_char *)lsrp < dataend) {
                                TCHECK(*lsrp);
                                printf(" {");           /* } (ctags) */
                                ospf_print_ls_type(ntohl(lsrp->ls_type),
                                    &lsrp->ls_stateid,
                                    &lsrp->ls_router,
                                    "LinkStateType %d");
                                                        /* { (ctags) */
                                printf(" }");
                                ++lsrp;
                        }
                }
                break;

        case OSPF_TYPE_LSU:
                if (vflag) {
                        lsap = op->ospf_lsu.lsu_lsa;
                        TCHECK(op->ospf_lsu.lsu_count);
                        i = ntohl(op->ospf_lsu.lsu_count);
                        while (i--) {
                                if (ospf_print_lsa(lsap))
                                        goto trunc;
                                lsap = (struct lsa *)((u_char *)lsap +
                                    ntohs(lsap->ls_hdr.ls_length));
                        }
                }
                break;


        case OSPF_TYPE_LSA:
                if (vflag) {
                        lshp = op->ospf_lsa.lsa_lshdr;

                        while (!ospf_print_lshdr(lshp)) {
                                                        /* { (ctags) */
                                printf(" }");
                                ++lshp;
                        }
                }
                break;

        default:
                printf("v2 type %d", op->ospf_type);
                break;
        }
        return (0);
trunc:
        return (1);
}

void
ospf_print(const u_char *bp, u_int length, const u_char *bp2)
{
        const struct ospfhdr *op;
        const struct ip *ip;
        const u_char *dataend;
        const char *cp;

        op = (struct ospfhdr *)bp;
        ip = (struct ip *)bp2;
        /* Print the source and destination address  */
        printf("%s > %s:",
            ipaddr_string(&ip->ip_src),
            ipaddr_string(&ip->ip_dst));

        /* XXX Before we do anything else, strip off the MD5 trailer */
        TCHECK(op->ospf_authtype);
        if (ntohs(op->ospf_authtype) == OSPF_AUTH_MD5) {
                length -= OSPF_AUTH_MD5_LEN;
                snapend -= OSPF_AUTH_MD5_LEN;
        }

        /* If the type is valid translate it, or just print the type */
        /* value.  If it's not valid, say so and return */
        TCHECK(op->ospf_type);
        cp = tok2str(type2str, "type%d", op->ospf_type);
        printf(" OSPFv%d-%s ", op->ospf_version, cp);
        if (*cp == 't')
                return;

        TCHECK(op->ospf_len);
        if (length < ntohs(op->ospf_len)) {
                printf(" [len %d]", ntohs(op->ospf_len));
                return;
        } else if (length > ntohs(op->ospf_len)) {
                printf(" %d[%d]:", ntohs(op->ospf_len), length);
                length = ntohs(op->ospf_len);
        } else
                printf(" %d:", length);
        dataend = bp + length;

        TCHECK(op->ospf_routerid);
        printf(" rtrid %s", ipaddr_string(&op->ospf_routerid));

        TCHECK(op->ospf_areaid);
        if (op->ospf_areaid.s_addr != 0)
                printf(" area %s", ipaddr_string(&op->ospf_areaid));
        else
                printf(" backbone");

        if (vflag) {
                /* Print authentication data (should we really do this?) */
                TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
                switch (ntohs(op->ospf_authtype)) {

                case OSPF_AUTH_NONE:
                        break;

                case OSPF_AUTH_SIMPLE:
                        printf(" auth \"");
                        (void)fn_printn(op->ospf_authdata,
                            sizeof(op->ospf_authdata), NULL);
                        printf("\"");
                        break;

                case OSPF_AUTH_MD5: {
                        struct ospf_md5_authdata auth;
                        memcpy(&auth, op->ospf_authdata, sizeof(auth));

                        printf(" auth MD5 key-id %u", auth.auth_keyid);
                        if (vflag)
                                printf(" seq %u", ntohl(auth.auth_seq));
                        if (vflag > 1) {
                                printf(" off %u len %u",
                                    ntohs(auth.auth_md5_offset),
                                    auth.auth_len);
                        }
                        break;
                }

                default:
                        printf(" ??authtype-%d??", ntohs(op->ospf_authtype));
                        return;
                }
        }
        /* Do rest according to version.         */
        switch (op->ospf_version) {

        case 2:
                /* ospf version 2 */
                if (ospf_decode_v2(op, dataend))
                        goto trunc;
                break;

        default:
                printf(" ospf [version %d]", op->ospf_version);
                break;
        }                       /* end switch on version */

        return;
trunc:
        printf("%s", tstr);
}