/*      $OpenBSD: ripctl.c,v 1.22 2024/11/21 13:38:15 claudio Exp $
 *
 * Copyright (c) 2006 Michele Marchetto <mydecay@openbeer.it>
 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
 * Copyright (c) 2003 Henning Brauer <henning@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/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if_media.h>
#include <net/if_types.h>

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "rip.h"
#include "ripd.h"
#include "ripe.h"
#include "parser.h"

__dead void      usage(void);
const char      *fmt_timeframe_core(time_t);
const char      *get_linkstate(uint8_t, int);
int              show_interface_msg(struct imsg *);
uint64_t         get_ifms_type(uint8_t);
int              show_rib_msg(struct imsg *);
int              show_nbr_msg(struct imsg *);
void             show_fib_head(void);
int              show_fib_msg(struct imsg *);
void             show_interface_head(void);
int              show_fib_interface_msg(struct imsg *);
const char      *get_media_descr(uint64_t);
void             print_baudrate(uint64_t);

struct imsgbuf  *ibuf;

__dead void
usage(void)
{
        extern char *__progname;

        fprintf(stderr, "usage: %s [-s socket] command [argument ...]\n",
            __progname);
        exit(1);
}

int
main(int argc, char *argv[])
{
        struct sockaddr_un       sun;
        struct parse_result     *res;
        struct imsg              imsg;
        unsigned int             ifidx = 0;
        int                      ctl_sock;
        int                      done = 0, verbose = 0;
        int                      n;
        int                      ch;
        char                    *sockname = RIPD_SOCKET;

        while ((ch = getopt(argc, argv, "s:")) != -1) {
                switch (ch) {
                case 's':
                        sockname = optarg;
                        break;
                default:
                        usage();
                        /* NOTREACHED */
                }
        }

        argc -= optind;
        argv += optind;

        /* parse options */
        if ((res = parse(argc, argv)) == NULL)
                exit(1);

        /* connect to ripd control socket */
        if ((ctl_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
                err(1, "socket");

        bzero(&sun, sizeof(sun));
        sun.sun_family = AF_UNIX;
        strlcpy(sun.sun_path, sockname, sizeof(sun.sun_path));
        if (connect(ctl_sock, (struct sockaddr *)&sun, sizeof(sun)) == -1)
                err(1, "connect: %s", sockname);

        if (pledge("stdio", NULL) == -1)
                err(1, "pledge");

        if ((ibuf = malloc(sizeof(struct imsgbuf))) == NULL)
                err(1, NULL);
        if (imsgbuf_init(ibuf, ctl_sock) == -1)
                err(1, NULL);
        done = 0;

        /* process user request */
        switch (res->action) {
        case NONE:
                usage();
                /* not reached */
        case SHOW:
        case SHOW_IFACE:
                printf("%-11s %-18s %-10s %-10s %-8s\n",
                    "Interface", "Address", "State", "Linkstate",
                    "Uptime");
                if (*res->ifname) {
                        ifidx = if_nametoindex(res->ifname);
                        if (ifidx == 0)
                                errx(1, "no such interface %s", res->ifname);
                }
                imsg_compose(ibuf, IMSG_CTL_SHOW_INTERFACE, 0, 0, -1,
                    &ifidx, sizeof(ifidx));
                break;
        case SHOW_NBR:
                printf("%-15s %-15s %-15s %-9s %-10s\n", "ID",
                    "State", "Address", "Iface", "Uptime");
                imsg_compose(ibuf, IMSG_CTL_SHOW_NBR, 0, 0, -1, NULL, 0);
                break;
        case SHOW_RIB:
                printf("%-20s %-17s %-7s\n", "Destination",
                    "Nexthop", "Cost");
                imsg_compose(ibuf, IMSG_CTL_SHOW_RIB, 0, 0, -1, NULL, 0);
                break;
        case SHOW_FIB:
                if (!res->addr.s_addr)
                        imsg_compose(ibuf, IMSG_CTL_KROUTE, 0, 0, -1,
                            &res->flags, sizeof(res->flags));
                else
                        imsg_compose(ibuf, IMSG_CTL_KROUTE_ADDR, 0, 0, -1,
                            &res->addr, sizeof(res->addr));
                show_fib_head();
                break;
        case SHOW_FIB_IFACE:
                if (*res->ifname)
                        imsg_compose(ibuf, IMSG_CTL_IFINFO, 0, 0, -1,
                            res->ifname, sizeof(res->ifname));
                else
                        imsg_compose(ibuf, IMSG_CTL_IFINFO, 0, 0, -1, NULL, 0);
                show_interface_head();
                break;
        case FIB:
                errx(1, "fib couple|decouple");
                break;
        case FIB_COUPLE:
                imsg_compose(ibuf, IMSG_CTL_FIB_COUPLE, 0, 0, -1, NULL, 0);
                printf("couple request sent.\n");
                done = 1;
                break;
        case FIB_DECOUPLE:
                imsg_compose(ibuf, IMSG_CTL_FIB_DECOUPLE, 0, 0, -1, NULL, 0);
                printf("decouple request sent.\n");
                done = 1;
                break;
        case LOG_VERBOSE:
                verbose = 1;
                /* FALLTHROUGH */
        case LOG_BRIEF:
                imsg_compose(ibuf, IMSG_CTL_LOG_VERBOSE, 0, 0, -1,
                    &verbose, sizeof(verbose));
                printf("logging request sent.\n");
                done = 1;
                break;
        case RELOAD:
                imsg_compose(ibuf, IMSG_CTL_RELOAD, 0, 0, -1, NULL, 0);
                printf("reload request sent.\n");
                done = 1;
                break;
        }

        if (imsgbuf_flush(ibuf) == -1)
                err(1, "write error");

        while (!done) {
                if ((n = imsgbuf_read(ibuf)) == -1)
                        err(1, "read error");
                if (n == 0)
                        errx(1, "pipe closed");

                while (!done) {
                        if ((n = imsg_get(ibuf, &imsg)) == -1)
                                errx(1, "imsg_get error");
                        if (n == 0)
                                break;
                        switch (res->action) {
                        case SHOW:
                        case SHOW_IFACE:
                                done = show_interface_msg(&imsg);
                                break;
                        case SHOW_NBR:
                                done = show_nbr_msg(&imsg);
                                break;
                        case SHOW_RIB:
                                done = show_rib_msg(&imsg);
                                break;
                        case SHOW_FIB:
                                done = show_fib_msg(&imsg);
                                break;
                        case SHOW_FIB_IFACE:
                                done = show_fib_interface_msg(&imsg);
                                break;
                        case NONE:
                        case FIB:
                        case FIB_COUPLE:
                        case FIB_DECOUPLE:
                        case LOG_VERBOSE:
                        case LOG_BRIEF:
                        case RELOAD:
                                break;
                        }
                        imsg_free(&imsg);
                }
        }
        close(ctl_sock);
        free(ibuf);

        return (0);
}

uint64_t
get_ifms_type(uint8_t if_type)
{
        switch (if_type) {
        case IFT_ETHER:
                return (IFM_ETHER);
                break;
        case IFT_FDDI:
                return (IFM_FDDI);
                break;
        case IFT_CARP:
                return (IFM_CARP);
                break;
        default:
                return (0);
                break;
        }
}

#define TF_BUFS 8
#define TF_LEN  9

const char *
fmt_timeframe_core(time_t t)
{
        char            *buf;
        static char      tfbuf[TF_BUFS][TF_LEN];        /* ring buffer */
        static int       idx = 0;
        unsigned int     sec, min, hrs, day;
        unsigned long long      week;

        if (t == 0)
                return ("Stopped");

        buf = tfbuf[idx++];
        if (idx == TF_BUFS)
                idx = 0;

        week = t;

        sec = week % 60;
        week /= 60;
        min = week % 60;
        week /= 60;
        hrs = week % 24;
        week /= 24;
        day = week % 7;
        week /= 7;

        if (week > 0)
                snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
        else if (day > 0)
                snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
        else
                snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);

        return (buf);
}

/* prototype defined in ripd.h and shared with the kroute.c version */
u_int8_t
mask2prefixlen(in_addr_t ina)
{
        if (ina == 0)
                return (0);
        else
                return (33 - ffs(ntohl(ina)));
}

int
show_interface_msg(struct imsg *imsg)
{
        struct ctl_iface        *iface;
        char                    *netid;

        switch (imsg->hdr.type) {
        case IMSG_CTL_SHOW_IFACE:
                iface = imsg->data;

                if (asprintf(&netid, "%s/%d", inet_ntoa(iface->addr),
                    mask2prefixlen(iface->mask.s_addr)) == -1)
                        err(1, NULL);
                printf("%-11s %-18s %-10s %-10s %-8s\n",
                    iface->name, netid, if_state_name(iface->state),
                    get_linkstate(iface->if_type, iface->linkstate),
                    iface->uptime == 0 ? "00:00:00" :
                    fmt_timeframe_core(iface->uptime));
                free(netid);
                break;
        case IMSG_CTL_END:
                printf("\n");
                return (1);
        default:
                break;
        }

        return (0);
}

int
show_rib_msg(struct imsg *imsg)
{
        struct ctl_rt   *rt;
        char            *dstnet;

        switch (imsg->hdr.type) {
        case IMSG_CTL_SHOW_RIB:
                rt = imsg->data;
                if (asprintf(&dstnet, "%s/%d", inet_ntoa(rt->prefix),
                    mask2prefixlen(rt->netmask.s_addr)) == -1)
                        err(1, NULL);

                printf("%-20s %-17s %-7d\n", dstnet,
                    inet_ntoa(rt->nexthop),
                    rt->metric);
                free(dstnet);

                break;
        case IMSG_CTL_END:
                printf("\n");
                return (1);
        default:
                break;
        }

        return (0);
}

int
show_nbr_msg(struct imsg *imsg)
{
        struct ctl_nbr  *nbr;
        char            *state;

        switch (imsg->hdr.type) {
        case IMSG_CTL_SHOW_NBR:
                nbr = imsg->data;
                if (asprintf(&state, "%s/%s", nbr_state_name(nbr->nbr_state),
                    if_state_name(nbr->iface_state)) == -1)
                        err(1, NULL);
                printf("%-15s %-16s", inet_ntoa(nbr->id),
                    state);
                printf("%-15s %-10s", inet_ntoa(nbr->addr), nbr->name);
                printf("%-15s\n", nbr->uptime == 0 ? "-" :
                    fmt_timeframe_core(nbr->uptime));
                free(state);
                break;
        case IMSG_CTL_END:
                printf("\n");
                return (1);
        default:
                break;
        }

        return (0);
}

void
show_fib_head(void)
{
        printf("flags: * = valid, R = RIP, C = Connected, S = Static\n");
        printf("%-6s %-20s %-17s\n", "Flags", "Destination", "Nexthop");
}

int
show_fib_msg(struct imsg *imsg)
{
        struct kroute           *k;
        char                    *p;

        switch (imsg->hdr.type) {
        case IMSG_CTL_KROUTE:
                if (imsg->hdr.len < IMSG_HEADER_SIZE + sizeof(struct kroute))
                        errx(1, "wrong imsg len");
                k = imsg->data;

                if (k->flags & F_DOWN)
                        printf(" ");
                else
                        printf("*");

                if (k->flags & F_RIPD_INSERTED)
                        printf("R");
                else if (k->flags & F_CONNECTED)
                        printf("C");
                else if (k->flags & F_STATIC)
                        printf("S");
                else
                        printf(" ");

                printf("     ");
                if (asprintf(&p, "%s/%u", inet_ntoa(k->prefix),
                    mask2prefixlen(k->netmask.s_addr)) == -1)
                        err(1, NULL);
                printf("%-20s ", p);
                free(p);

                if (k->nexthop.s_addr)
                        printf("%s", inet_ntoa(k->nexthop));
                else if (k->flags & F_CONNECTED)
                        printf("link#%u", k->ifindex);
                printf("\n");

                break;
        case IMSG_CTL_END:
                printf("\n");
                return (1);
        default:
                break;
        }

        return (0);
}

void
show_interface_head(void)
{
        printf("%-15s%-15s%s\n", "Interface", "Flags",
            "Link state");
}

int
show_fib_interface_msg(struct imsg *imsg)
{
        struct kif      *k;
        uint64_t         ifms_type;

        switch (imsg->hdr.type) {
        case IMSG_CTL_IFINFO:
                k = imsg->data;
                printf("%-15s", k->ifname);
                printf("%-15s", k->flags & IFF_UP ? "UP" : "");
                ifms_type = get_ifms_type(k->if_type);
                if (ifms_type)
                        printf("%s, ", get_media_descr(ifms_type));

                printf("%s", get_linkstate(k->if_type, k->link_state));

                if (k->link_state != LINK_STATE_DOWN && k->baudrate > 0) {
                        printf(", ");
                        print_baudrate(k->baudrate);
                }
                printf("\n");
                break;
        case IMSG_CTL_END:
                printf("\n");
                return (1);
        default:
                break;
        }

        return (0);
}

const struct if_status_description
                if_status_descriptions[] = LINK_STATE_DESCRIPTIONS;
const struct ifmedia_description
                ifm_type_descriptions[] = IFM_TYPE_DESCRIPTIONS;

const char *
get_media_descr(uint64_t media_type)
{
        const struct ifmedia_description        *p;

        for (p = ifm_type_descriptions; p->ifmt_string != NULL; p++)
                if (media_type == p->ifmt_word)
                        return (p->ifmt_string);

        return ("unknown");
}

const char *
get_linkstate(uint8_t if_type, int link_state)
{
        const struct if_status_description *p;
        static char buf[8];

        for (p = if_status_descriptions; p->ifs_string != NULL; p++) {
                if (LINK_STATE_DESC_MATCH(p, if_type, link_state))
                        return (p->ifs_string);
        }
        snprintf(buf, sizeof(buf), "[#%d]", link_state);
        return (buf);
}

void
print_baudrate(uint64_t baudrate)
{
        if (baudrate > IF_Gbps(1))
                printf("%llu GBit/s", baudrate / IF_Gbps(1));
        else if (baudrate > IF_Mbps(1))
                printf("%llu MBit/s", baudrate / IF_Mbps(1));
        else if (baudrate > IF_Kbps(1))
                printf("%llu KBit/s", baudrate / IF_Kbps(1));
        else
                printf("%llu Bit/s", baudrate);
}