/*
 * print PPP statistics:
 * 	pppstats [-a|-d] [-v|-r|-z] [-c count] [-w wait] [interface]
 *
 *   -a Show absolute values rather than deltas
 *   -d Show data rate (kB/s) rather than bytes
 *   -v Show more stats for VJ TCP header compression
 *   -r Show compression ratio
 *   -z Show compression statistics instead of default display
 *
 * History:
 *      perkins@cps.msu.edu: Added compression statistics and alternate 
 *                display. 11/94
 *	Brad Parker (brad@cayman.com) 6/92
 *
 * from the original "slstats" by Van Jacobson
 *
 * Copyright (c) 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef __STDC__
#define const
#endif

#ifndef lint
static const char rcsid[] = "$Id: pppstats.c,v 1.29 2002/10/27 12:56:26 fcusack Exp $";
#endif

#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>

#ifndef STREAMS
#if defined(__linux__) && defined(__powerpc__) \
    && (__GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
/* kludge alert! */
#undef __GLIBC__
#endif
#include <sys/socket.h>		/* *BSD, Linux, NeXT, Ultrix etc. */
#ifndef __linux__
#include <net/if.h>
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#else
/* Linux */
#if __GLIBC__ >= 2
#include <asm/types.h>		/* glibc 2 conflicts with linux/types.h */
#include <net/if.h>
#else
#include <linux/types.h>
#include <linux/if.h>
#endif
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#endif /* __linux__ */

#else	/* STREAMS */
#include <sys/stropts.h>	/* SVR4, Solaris 2, SunOS 4, OSF/1, etc. */
#include <net/ppp_defs.h>
#include <net/pppio.h>

#endif	/* STREAMS */

int	vflag, rflag, zflag;	/* select type of display */
int	aflag;			/* print absolute values, not deltas */
int	dflag;			/* print data rates, not bytes */
int	interval, count;
int	infinite;
int	s;			/* socket or /dev/ppp file descriptor */
int	signalled;		/* set if alarm goes off "early" */
char	*progname;
char	*interface;

#if defined(SUNOS4) || defined(ULTRIX) || defined(NeXT)
extern int optind;
extern char *optarg;
#endif

/*
 * If PPP_DRV_NAME is not defined, use the legacy "ppp" as the
 * device name.
 */
#if !defined(PPP_DRV_NAME)
#define PPP_DRV_NAME    "ppp"
#endif /* !defined(PPP_DRV_NAME) */

static void usage(void);
static void catchalarm(int);
static void get_ppp_stats(struct ppp_stats *);
static void get_ppp_cstats(struct ppp_comp_stats *);
static void intpr(void);

int main(int, char *argv[]);

static void
usage(void)
{
    fprintf(stderr, "Usage: %s [-a|-d] [-v|-r|-z] [-c count] [-w wait] [interface]\n",
	    progname);
    exit(1);
}

/*
 * Called if an interval expires before intpr has completed a loop.
 * Sets a flag to not wait for the alarm.
 */
static void
catchalarm(int arg)
{
    signalled = 1;
}


#ifndef STREAMS
static void
get_ppp_stats(struct ppp_stats *curp)
{
    struct ifpppstatsreq req;

    memset (&req, 0, sizeof (req));

#ifdef __linux__
    req.stats_ptr = (caddr_t) &req.stats;
#undef ifr_name
#define ifr_name ifr__name
#endif

    strncpy(req.ifr_name, interface, IFNAMSIZ);
    req.ifr_name[IFNAMSIZ - 1] = 0;
    if (ioctl(s, SIOCGPPPSTATS, &req) < 0) {
	fprintf(stderr, "%s: ", progname);
	if (errno == ENOTTY)
	    fprintf(stderr, "kernel support missing\n");
	else
	    perror("couldn't get PPP statistics");
	exit(1);
    }
    *curp = req.stats;
}

static void
get_ppp_cstats(struct ppp_comp_stats *csp)
{
    struct ifpppcstatsreq creq;

    memset (&creq, 0, sizeof (creq));

#ifdef __linux__
    creq.stats_ptr = (caddr_t) &creq.stats;
#undef  ifr_name
#define ifr_name ifr__name
#endif

    strncpy(creq.ifr_name, interface, IFNAMSIZ);
    creq.ifr_name[IFNAMSIZ - 1] = 0;
    if (ioctl(s, SIOCGPPPCSTATS, &creq) < 0) {
	fprintf(stderr, "%s: ", progname);
	if (errno == ENOTTY) {
	    fprintf(stderr, "no kernel compression support\n");
	    if (zflag)
		exit(1);
	    rflag = 0;
	} else {
	    perror("couldn't get PPP compression stats");
	    exit(1);
	}
    }

#ifdef __linux__
    if (creq.stats.c.bytes_out == 0) {
	creq.stats.c.bytes_out = creq.stats.c.comp_bytes + creq.stats.c.inc_bytes;
	creq.stats.c.in_count = creq.stats.c.unc_bytes;
    }
    if (creq.stats.c.bytes_out == 0)
	creq.stats.c.ratio = 0.0;
    else
	creq.stats.c.ratio = 256.0 * creq.stats.c.in_count /
			     creq.stats.c.bytes_out;

    if (creq.stats.d.bytes_out == 0) {
	creq.stats.d.bytes_out = creq.stats.d.comp_bytes + creq.stats.d.inc_bytes;
	creq.stats.d.in_count = creq.stats.d.unc_bytes;
    }
    if (creq.stats.d.bytes_out == 0)
	creq.stats.d.ratio = 0.0;
    else
	creq.stats.d.ratio = 256.0 * creq.stats.d.in_count /
			     creq.stats.d.bytes_out;
#endif

    *csp = creq.stats;
}

#else	/* STREAMS */

int
strioctl(int fd, int cmd, char *ptr, int ilen, int olen)
{
    struct strioctl str;

    str.ic_cmd = cmd;
    str.ic_timout = 0;
    str.ic_len = ilen;
    str.ic_dp = ptr;
    if (ioctl(fd, I_STR, &str) == -1)
	return -1;
    if (str.ic_len != olen)
	fprintf(stderr, "strioctl: expected %d bytes, got %d for cmd %x\n",
	       olen, str.ic_len, cmd);
    return 0;
}

static void
get_ppp_stats(struct ppp_stats *curp)
{
    if (strioctl(s, PPPIO_GETSTAT, curp, 0, sizeof(*curp)) < 0) {
	fprintf(stderr, "%s: ", progname);
	if (errno == EINVAL)
	    fprintf(stderr, "kernel support missing\n");
	else
	    perror("couldn't get PPP statistics");
	exit(1);
    }
}

static void
get_ppp_cstats(struct ppp_comp_stats *csp)
{
    if (strioctl(s, PPPIO_GETCSTAT, csp, 0, sizeof(*csp)) < 0) {
	fprintf(stderr, "%s: ", progname);
	if (errno == ENOTTY) {
	    fprintf(stderr, "no kernel compression support\n");
	    if (zflag)
		exit(1);
	    rflag = 0;
	} else {
	    perror("couldn't get PPP compression statistics");
	    exit(1);
	}
    }
}

#endif /* STREAMS */

#define MAX0(a)		((int)(a) > 0? (a): 0)
#define V(offset)	MAX0(cur.offset - old.offset)
#define W(offset)	MAX0(ccs.offset - ocs.offset)

#define RATIO(c, i, u)	((c) == 0? 1.0: (u) / ((double)(c) + (i)))
#define CRATE(x)	RATIO(W(x.comp_bytes), W(x.inc_bytes), W(x.unc_bytes))

#define KBPS(n)		((n) / (interval * 1000.0))

/*
 * Print a running summary of interface statistics.
 * Repeat display every interval seconds, showing statistics
 * collected over that interval.  Assumes that interval is non-zero.
 * First line printed is cumulative.
 */
static void
intpr(void)
{
    register int line = 0;
    sigset_t oldmask, mask;
    char *bunit;
    int ratef = 0;
    struct ppp_stats cur, old;
    struct ppp_comp_stats ccs, ocs;

    memset(&old, 0, sizeof(old));
    memset(&ocs, 0, sizeof(ocs));

    while (1) {
	get_ppp_stats(&cur);
	if (zflag || rflag)
	    get_ppp_cstats(&ccs);

	(void)signal(SIGALRM, catchalarm);
	signalled = 0;
	(void)alarm(interval);

	if ((line % 20) == 0) {
	    if (zflag) {
		printf("IN:  COMPRESSED  INCOMPRESSIBLE   COMP | ");
		printf("OUT: COMPRESSED  INCOMPRESSIBLE   COMP\n");
		bunit = dflag? "KB/S": "BYTE";
		printf("    %s   PACK     %s   PACK  RATIO | ", bunit, bunit);
		printf("    %s   PACK     %s   PACK  RATIO", bunit, bunit);
	    } else {
		printf("%8.8s %6.6s %6.6s",
		       "IN", "PACK", "VJCOMP");

		if (!rflag)
		    printf(" %6.6s %6.6s", "VJUNC", "VJERR");
		if (vflag)
		    printf(" %6.6s %6.6s", "VJTOSS", "NON-VJ");
		if (rflag)
		    printf(" %6.6s %6.6s", "RATIO", "UBYTE");
		printf("  | %8.8s %6.6s %6.6s",
		       "OUT", "PACK", "VJCOMP");

		if (!rflag)
		    printf(" %6.6s %6.6s", "VJUNC", "NON-VJ");
		if (vflag)
		    printf(" %6.6s %6.6s", "VJSRCH", "VJMISS");
		if (rflag)
		    printf(" %6.6s %6.6s", "RATIO", "UBYTE");
	    }
	    putchar('\n');
	}

	if (zflag) {
	    if (ratef) {
		printf("%8.3f %6u %8.3f %6u %6.2f",
		       KBPS(W(d.comp_bytes)),
		       W(d.comp_packets),
		       KBPS(W(d.inc_bytes)),
		       W(d.inc_packets),
		       ccs.d.ratio / 256.0);
		printf(" | %8.3f %6u %8.3f %6u %6.2f",
		       KBPS(W(c.comp_bytes)),
		       W(c.comp_packets),
		       KBPS(W(c.inc_bytes)),
		       W(c.inc_packets),
		       ccs.c.ratio / 256.0);
	    } else {
		printf("%8u %6u %8u %6u %6.2f",
		       W(d.comp_bytes),
		       W(d.comp_packets),
		       W(d.inc_bytes),
		       W(d.inc_packets),
		       ccs.d.ratio / 256.0);
		printf(" | %8u %6u %8u %6u %6.2f",
		       W(c.comp_bytes),
		       W(c.comp_packets),
		       W(c.inc_bytes),
		       W(c.inc_packets),
		       ccs.c.ratio / 256.0);
	    }
	
	} else {
	    if (ratef)
		printf("%8.3f", KBPS(V(p.ppp_ibytes)));
	    else
		printf("%8u", V(p.ppp_ibytes));
	    printf(" %6u %6u",
		   V(p.ppp_ipackets),
		   V(vj.vjs_compressedin));
	    if (!rflag)
		printf(" %6u %6u",
		       V(vj.vjs_uncompressedin),
		       V(vj.vjs_errorin));
	    if (vflag)
		printf(" %6u %6u",
		       V(vj.vjs_tossed),
		       V(p.ppp_ipackets) - V(vj.vjs_compressedin)
		       - V(vj.vjs_uncompressedin) - V(vj.vjs_errorin));
	    if (rflag) {
		printf(" %6.2f ", CRATE(d));
		if (ratef)
		    printf("%6.2f", KBPS(W(d.unc_bytes)));
		else
		    printf("%6u", W(d.unc_bytes));
	    }
	    if (ratef)
		printf("  | %8.3f", KBPS(V(p.ppp_obytes)));
	    else
		printf("  | %8u", V(p.ppp_obytes));
	    printf(" %6u %6u",
		   V(p.ppp_opackets),
		   V(vj.vjs_compressed));
	    if (!rflag)
		printf(" %6u %6u",
		       V(vj.vjs_packets) - V(vj.vjs_compressed),
		       V(p.ppp_opackets) - V(vj.vjs_packets));
	    if (vflag)
		printf(" %6u %6u",
		       V(vj.vjs_searches),
		       V(vj.vjs_misses));
	    if (rflag) {
		printf(" %6.2f ", CRATE(c));
		if (ratef)
		    printf("%6.2f", KBPS(W(c.unc_bytes)));
		else
		    printf("%6u", W(c.unc_bytes));
	    }

	}

	putchar('\n');
	fflush(stdout);
	line++;

	count--;
	if (!infinite && !count)
	    break;

	sigemptyset(&mask);
	sigaddset(&mask, SIGALRM);
	sigprocmask(SIG_BLOCK, &mask, &oldmask);
	if (!signalled) {
	    sigemptyset(&mask);
	    sigsuspend(&mask);
	}
	sigprocmask(SIG_SETMASK, &oldmask, NULL);
	signalled = 0;
	(void)alarm(interval);

	if (!aflag) {
	    old = cur;
	    ocs = ccs;
	    ratef = dflag;
	}
    }
}

int
main(int argc, char *argv[])
{
    int c;
#ifdef STREAMS
    int unit;
    char *dev;
#endif

    interface = PPP_DRV_NAME "0";
    if ((progname = strrchr(argv[0], '/')) == NULL)
	progname = argv[0];
    else
	++progname;

    while ((c = getopt(argc, argv, "advrzc:w:")) != -1) {
	switch (c) {
	case 'a':
	    ++aflag;
	    break;
	case 'd':
	    ++dflag;
	    break;
	case 'v':
	    ++vflag;
	    break;
	case 'r':
	    ++rflag;
	    break;
	case 'z':
	    ++zflag;
	    break;
	case 'c':
	    count = atoi(optarg);
	    if (count <= 0)
		usage();
	    break;
	case 'w':
	    interval = atoi(optarg);
	    if (interval <= 0)
		usage();
	    break;
	default:
	    usage();
	}
    }
    argc -= optind;
    argv += optind;

    if (!interval && count)
	interval = 5;
    if (interval && !count)
	infinite = 1;
    if (!interval && !count)
	count = 1;
    if (aflag)
	dflag = 0;

    if (argc > 1)
	usage();
    if (argc > 0)
	interface = argv[0];

#ifndef STREAMS
    {
	struct ifreq ifr;

	s = socket(AF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
	    fprintf(stderr, "%s: ", progname);
	    perror("couldn't create IP socket");
	    exit(1);
	}

#ifdef __linux__
#undef  ifr_name
#define ifr_name ifr_ifrn.ifrn_name
#endif
	strncpy(ifr.ifr_name, interface, IFNAMSIZ);
	ifr.ifr_name[IFNAMSIZ - 1] = 0;
	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
	    fprintf(stderr, "%s: nonexistent interface '%s' specified\n",
		    progname, interface);
	    exit(1);
	}
    }

#else	/* STREAMS */
    if (sscanf(interface, PPP_DRV_NAME "%d", &unit) != 1) {
	fprintf(stderr, "%s: invalid interface '%s' specified\n",
		progname, interface);
    }

#ifdef __osf__
    dev = "/dev/streams/ppp";
#else
    dev = "/dev/" PPP_DRV_NAME;
#endif
    if ((s = open(dev, O_RDONLY)) < 0) {
	fprintf(stderr, "%s: couldn't open ", progname);
	perror(dev);
	exit(1);
    }
    if (strioctl(s, PPPIO_ATTACH, &unit, sizeof(int), 0) < 0) {
	fprintf(stderr, "%s: ppp%d is not available\n", progname, unit);
	exit(1);
    }

#endif	/* STREAMS */

    intpr();
    exit(0);
}