/*
 * Copyright (c) 2013 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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 DragonFly 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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/param.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <netinet/in_pcb.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>

#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <nlist.h>
#include <paths.h>
#include "systat.h"
#include "extern.h"

struct mytcpcb {
        RB_ENTRY(mytcpcb)       rb_node;
        int                     seq;
        struct xtcpcb           xtcp;
        struct xtcpcb           last_xtcp;
};

static int
mytcpcb_cmp(struct mytcpcb *tcp1, struct mytcpcb *tcp2)
{
        int r;

        /*
         * Low local or foreign port comes first (local has priority).
         */
        if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_lport) >= 1024 &&
            ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_lport) >= 1024) {
                if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_fport) <
                    ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_fport))
                        return(-1);
                if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_fport) >
                    ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_fport))
                        return(1);
        }

        if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_lport) <
            ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_lport))
                return(-1);
        if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_lport) >
            ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_lport))
                return(1);
        if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_fport) <
            ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_fport))
                return(-1);
        if (ntohs(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_fport) >
            ntohs(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_fport))
                return(1);

        /*
         * Sort IPV4 vs IPV6 addresses
         */
        if (tcp1->xtcp.xt_inp.inp_af < tcp2->xtcp.xt_inp.inp_af)
                return(-1);
        if (tcp1->xtcp.xt_inp.inp_af > tcp2->xtcp.xt_inp.inp_af)
                return(1);

        /*
         * Local and foreign addresses
         */
        if (INP_ISIPV4(&tcp1->xtcp.xt_inp)) {
                if (ntohl(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_laddr.s_addr) <
                    ntohl(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_laddr.s_addr))
                        return(-1);
                if (ntohl(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_laddr.s_addr) >
                    ntohl(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_laddr.s_addr))
                        return(1);
                if (ntohl(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_faddr.s_addr) <
                    ntohl(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_faddr.s_addr))
                        return(-1);
                if (ntohl(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie_faddr.s_addr) >
                    ntohl(tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie_faddr.s_addr))
                        return(1);
        } else if (INP_ISIPV6(&tcp1->xtcp.xt_inp)) {
                r = bcmp(&tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr,
                         &tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr,
                         sizeof(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr));
                if (r)
                        return(r);
        } else {
                r = bcmp(&tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr,
                         &tcp2->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr,
                         sizeof(tcp1->xtcp.xt_inp.inp_inc.inc_ie.ie6_faddr));
                if (r)
                        return(r);
        }
        return(0);
}

struct mytcpcb_tree;
RB_HEAD(mytcpcb_tree, mytcpcb);
RB_PROTOTYPE(mytcpcb_tree, mytcpcb, rb_node, mytcpcb_cmp);
RB_GENERATE(mytcpcb_tree, mytcpcb, rb_node, mytcpcb_cmp);

static struct mytcpcb_tree mytcp_tree;
static struct timeval tv_curr;
static struct timeval tv_last;
static struct tcp_stats tcp_curr;
static struct tcp_stats tcp_last;
static int tcp_pcb_seq;

static const char *numtok(double value);
static void netbwline(int row, struct mytcpcb *elm, double delta_time);
const char * netaddrstr(u_char vflags, union in_dependaddr *depaddr,
                        u_int16_t port);
static void updatepcb(struct xtcpcb *xtcp);

#define DELTARATE(field)        \
        ((double)(tcp_curr.field - tcp_last.field) / delta_time)

#define DELTAELM(field)         \
        ((double)(tcp_seq_diff_t)(elm->xtcp.field -             \
                                  elm->last_xtcp.field) /       \
         delta_time)

#define DELTAELMSCALE(field, scale)             \
        ((double)((tcp_seq_diff_t)(elm->xtcp.field -            \
                                   elm->last_xtcp.field) << scale) / \
         delta_time)

WINDOW *
opennetbw(void)
{
        RB_INIT(&mytcp_tree);
        return (subwin(stdscr, LINES-0-1, 0, 0, 0));
}

void
closenetbw(WINDOW *w)
{
        struct mytcpcb *mytcp;

        while ((mytcp = RB_ROOT(&mytcp_tree)) != NULL) {
                RB_REMOVE(mytcpcb_tree, &mytcp_tree, mytcp);
                free(mytcp);
        }

        if (w != NULL) {
                wclear(w);
                wrefresh(w);
                delwin(w);
        }
}

int
initnetbw(void)
{
        return(1);
}

void
fetchnetbw(void)
{
        struct tcp_stats tcp_array[SMP_MAXCPU];
        struct xtcpcb *tcp_pcbs;
        size_t npcbs;
        size_t len;
        size_t i;
        size_t j;
        size_t ncpus;

        /*
         * Extract PCB list
         */
        len = 0;
        if (sysctlbyname("net.inet.tcp.pcblist", NULL, &len, NULL, 0) < 0)
                return;
        len += 128 * sizeof(tcp_pcbs[0]);
        tcp_pcbs = malloc(len);
        if (sysctlbyname("net.inet.tcp.pcblist", tcp_pcbs, &len, NULL, 0) < 0) {
                free(tcp_pcbs);
                return;
        }
        npcbs = len / sizeof(tcp_pcbs[0]);
        ++tcp_pcb_seq;

        for (i = 0; i < npcbs; ++i) {
                if (tcp_pcbs[i].xt_len != sizeof(tcp_pcbs[0]))
                        break;
                updatepcb(&tcp_pcbs[i]);
        }
        free(tcp_pcbs);

        /*
         * General stats
         */
        len = sizeof(tcp_array);
        if (sysctlbyname("net.inet.tcp.stats", tcp_array, &len, NULL, 0) < 0)
                return;
        ncpus = len / sizeof(tcp_array[0]);
        tcp_last = tcp_curr;
        tv_last = tv_curr;
        bzero(&tcp_curr, sizeof(tcp_curr));
        gettimeofday(&tv_curr, NULL);

        for (i = 0; i < ncpus; ++i) {
                for (j = 0; j < sizeof(tcp_curr) / sizeof(u_long); ++j) {
                        ((u_long *)&tcp_curr)[j] +=
                                ((u_long *)&tcp_array[i])[j];
                }
        }
}

void
labelnetbw(void)
{
        wmove(wnd, 0, 0);
        wclrtobot(wnd);
#if 0
        mvwaddstr(wnd, 0, LADDR, "Local Address");
        mvwaddstr(wnd, 0, FADDR, "Foreign Address");
        mvwaddstr(wnd, 0, PROTO, "Proto");
        mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
        mvwaddstr(wnd, 0, SNDCC, "Send-Q");
        mvwaddstr(wnd, 0, STATE, "(state)");
#endif
}

void
shownetbw(void)
{
        double delta_time;
        struct mytcpcb *elm;
        struct mytcpcb *delm;
        int row;

        delta_time = (double)(tv_curr.tv_sec - tv_last.tv_sec) - 1.0 +
                     (tv_curr.tv_usec + 1000000 - tv_last.tv_usec) / 1e6;
        if (delta_time < 0.1)
                return;

        mvwprintw(wnd, 0, 0,
                  "tcp accepts %s connects %s "
                  "         rcv %s snd %s rexmit %s",
                  numtok(DELTARATE(tcps_accepts)),
                  numtok(DELTARATE(tcps_connects) - DELTARATE(tcps_accepts)),
                  numtok(DELTARATE(tcps_rcvbyte)),
                  numtok(DELTARATE(tcps_sndbyte)),
                  numtok(DELTARATE(tcps_sndrexmitbyte)));

        row = 2;
        delm = NULL;
        RB_FOREACH(elm, mytcpcb_tree, &mytcp_tree) {
                if (delm) {
                        RB_REMOVE(mytcpcb_tree, &mytcp_tree, delm);
                        free(delm);
                        delm = NULL;
                }
                if (elm->seq == tcp_pcb_seq &&
                    (elm->xtcp.xt_socket.so_rcv.sb_cc ||
                     elm->xtcp.xt_socket.so_snd.sb_cc ||
                     DELTAELM(xt_tp.snd_max) ||
                     DELTAELM(xt_tp.rcv_nxt)
                    )) {
                        if (row < LINES - 3)
                                netbwline(row, elm, delta_time);
                        ++row;
                } else if (elm->seq != tcp_pcb_seq) {
                        delm = elm;
                }
        }
        if (delm) {
                RB_REMOVE(mytcpcb_tree, &mytcp_tree, delm);
                free(delm);
                delm = NULL;
        }
        wmove(wnd, row, 0);
        wclrtobot(wnd);
        mvwprintw(wnd, LINES-2, 0,
                  "Rate/sec, "
                  "R=rxpend T=txpend N=nodelay T=tstmp "
                  "S=sack X=winscale F=fastrec");
}

static
void
netbwline(int row, struct mytcpcb *elm, double delta_time)
{
        mvwprintw(wnd, row, 0,
                  "%s %s "
                  /*"rxb %s txb %s "*/
                  "rcv %s snd %s "
                  "[%c%c%c%c%c%c%c]",
                  netaddrstr(
                    elm->xtcp.xt_inp.inp_af,
                    &elm->xtcp.xt_inp.inp_inc.inc_ie.
                        ie_dependladdr,
                    ntohs(elm->xtcp.xt_inp.inp_inc.inc_ie.ie_lport)),
                  netaddrstr(
                    elm->xtcp.xt_inp.inp_af,
                    &elm->xtcp.xt_inp.inp_inc.inc_ie.
                        ie_dependfaddr,
                    ntohs(elm->xtcp.xt_inp.inp_inc.inc_ie.ie_fport)),
                /*
                  numtok(elm->xtcp.xt_socket.so_rcv.sb_cc),
                  numtok(elm->xtcp.xt_socket.so_snd.sb_cc),
                */
                  numtok(DELTAELM(xt_tp.rcv_nxt)),
                  numtok(DELTAELM(xt_tp.snd_max)),
                  (elm->xtcp.xt_socket.so_rcv.sb_cc > 15000 ?
                   'R' : ' '),
                  (elm->xtcp.xt_socket.so_snd.sb_cc > 15000 ?
                   'T' : ' '),
                  ((elm->xtcp.xt_tp.t_flags & TF_NODELAY) ?
                   'N' : ' '),
                  ((elm->xtcp.xt_tp.t_flags & TF_RCVD_TSTMP) ?
                   'T' : ' '),
                  ((elm->xtcp.xt_tp.t_flags &
                   TF_SACK_PERMITTED) ?
                   'S' : ' '),
                  ((elm->xtcp.xt_tp.t_flags & TF_RCVD_SCALE) ?
                   'X' : ' '),
                  ((elm->xtcp.xt_tp.t_flags & TF_FASTRECOVERY) ?
                                   'F' : ' ')
        );
        wclrtoeol(wnd);
}

#if 0
int
cmdnetbw(const char *cmd __unused, char *args __unused)
{
        fetchnetbw();
        shownetbw();
        refresh();

        return (0);
}
#endif

#define MAXINDEXES 8

static
const char *
numtok(double value)
{
        static char buf[MAXINDEXES][32];
        static int nexti;
        static const char *suffixes[] = { " ", "K", "M", "G", "T", NULL };
        int suffix = 0;
        const char *fmt;

        while (value >= 1000.0 && suffixes[suffix+1]) {
                value /= 1000.0;
                ++suffix;
        }
        nexti = (nexti + 1) % MAXINDEXES;
        if (value < 0.001) {
                fmt = "      ";
        } else if (value < 1.0) {
                fmt = "%5.3f%s";
        } else if (value < 10.0) {
                fmt = "%5.3f%s";
        } else if (value < 100.0) {
                fmt = "%5.2f%s";
        } else {
                fmt = "%5.1f%s";
        }
        snprintf(buf[nexti], sizeof(buf[nexti]),
                 fmt, value, suffixes[suffix]);
        return (buf[nexti]);
}

const char *
netaddrstr(u_char af, union in_dependaddr *depaddr, u_int16_t port)
{
        static char buf[MAXINDEXES][64];
        static int nexta;
        char bufip[64];

        nexta = (nexta + 1) % MAXINDEXES;

        if (af == AF_INET) {
                snprintf(bufip, sizeof(bufip),
                         "%d.%d.%d.%d",
                         (ntohl(depaddr->id46_addr.ia46_addr4.s_addr) >> 24) &
                          255,
                         (ntohl(depaddr->id46_addr.ia46_addr4.s_addr) >> 16) &
                          255,
                         (ntohl(depaddr->id46_addr.ia46_addr4.s_addr) >> 8) &
                          255,
                         (ntohl(depaddr->id46_addr.ia46_addr4.s_addr) >> 0) &
                          255);
                snprintf(buf[nexta], sizeof(buf[nexta]),
                         "%15s:%-5d", bufip, port);
        } else if (af == AF_INET6) {
                snprintf(bufip, sizeof(bufip),
                         "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
                         ntohs(depaddr->id6_addr.s6_addr16[0]),
                         ntohs(depaddr->id6_addr.s6_addr16[1]),
                         ntohs(depaddr->id6_addr.s6_addr16[2]),
                         ntohs(depaddr->id6_addr.s6_addr16[3]),
                         ntohs(depaddr->id6_addr.s6_addr16[4]),
                         ntohs(depaddr->id6_addr.s6_addr16[5]),
                         ntohs(depaddr->id6_addr.s6_addr16[6]),
                         ntohs(depaddr->id6_addr.s6_addr16[7]));
                snprintf(buf[nexta], sizeof(buf[nexta]),
                         "%39s:%-5d", bufip, port);
        } else {
                snprintf(bufip, sizeof(bufip), "<unknown>");
                snprintf(buf[nexta], sizeof(buf[nexta]),
                         "%15s:%-5d", bufip, port);
        }
        return (buf[nexta]);
}

static
void
updatepcb(struct xtcpcb *xtcp)
{
        struct mytcpcb dummy;
        struct mytcpcb *elm;

        dummy.xtcp = *xtcp;
        if ((elm = RB_FIND(mytcpcb_tree, &mytcp_tree, &dummy)) == NULL) {
                elm = malloc(sizeof(*elm));
                bzero(elm, sizeof(*elm));
                elm->xtcp = *xtcp;
                elm->last_xtcp = *xtcp;
                RB_INSERT(mytcpcb_tree, &mytcp_tree, elm);
        } else {
                elm->last_xtcp = elm->xtcp;
                elm->xtcp = *xtcp;
        }
        elm->seq = tcp_pcb_seq;
}