usr.bin/pppdump/pppdump.c

/*
 * pppdump - print out the contents of a record file generated by
 * pppd in readable form.
 *
 * Copyright (C) 1999  Paul Mackerras.  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#ifdef PPP_DEFS_IN_NET
#include <net/ppp_defs.h>
#else
#include "ppp_defs.h"
#endif
#include "ppp-comp.h"

int hexmode;
int pppmode;
int reverse;
int decompress;
int mru = 1500;
int abs_times;
time_t start_time;
int start_time_tenths;
int tot_sent, tot_rcvd;

extern int optind;
extern char *optarg;

void dumplog();
void dumpppp();
void show_time();
void handle_ccp();

int
main(ac, av)
    int ac;
    char **av;
{
    int i;
    char *p;
    FILE *f;

    while ((i = getopt(ac, av, "hprdm:a")) != -1) {
    switch (i) {
    case 'h':
        hexmode = 1;
        break;
    case 'p':
        pppmode = 1;
        break;
    case 'r':
        reverse = 1;
        break;
    case 'd':
        decompress = 1;
        break;
    case 'm':
        mru = atoi(optarg);
        break;
    case 'a':
        abs_times = 1;
        break;
    default:
        fprintf(stderr, "Usage: %s [-h | -p[d]] [-r] [-m mru] [-a] [file ...]\n", av[0]);
        exit(1);
    }
    }
    if (optind >= ac)
    dumplog(stdin);
    else {
    for (i = optind; i < ac; ++i) {
        p = av[i];
        if ((f = fopen(p, "r")) == NULL) {
        perror(p);
        exit(1);
        }
        if (pppmode)
        dumpppp(f);
        else
        dumplog(f);
        fclose(f);
    }
    }
    exit(0);
}

void
dumplog(f)
    FILE *f;
{
    int c, n, k, col;
    int nb, c2;
    unsigned char buf[16];

    while ((c = getc(f)) != EOF) {
    switch (c) {
    case RECMARK_STARTSEND:
    case RECMARK_STARTRECV:
        if (reverse)
        c = c==RECMARK_STARTSEND ? RECMARK_STARTRECV :
            RECMARK_STARTSEND;
        printf("%s %c", c==RECMARK_STARTSEND? "sent": "rcvd",
        hexmode? ' ': '"');
        col = 6;
        n = getc(f);
        n = (n << 8) + getc(f);
        *(c==1? &tot_sent: &tot_rcvd) += n;
        nb = 0;
        for (; n > 0; --n) {
        c = getc(f);
        if (c == EOF) {
            printf("\nEOF\n");
            exit(0);
        }
        if (hexmode) {
            if (nb >= 16) {
            printf("  ");
            for (k = 0; k < nb; ++k) {
                c2 = buf[k];
                putchar((' ' <= c2 && c2 <= '~')? c2: '.');
            }
            printf("\n      ");
            nb = 0;
            }
            buf[nb++] = c;
            printf(" %.2x", c);
        } else {
            k = (' ' <= c && c <= '~')? (c != '\\' && c != '"')? 1: 2: 3;
            if ((col += k) >= 78) {
            printf("\n      ");
            col = 6 + k;
            }
            switch (k) {
            case 1:
            putchar(c);
            break;
            case 2:
            printf("\\%c", c);
            break;
            case 3:
            printf("\\%.2x", c);
            break;
            }
        }
        }
        if (hexmode) {
        for (k = nb; k < 16; ++k)
            printf("   ");
        printf("  ");
        for (k = 0; k < nb; ++k) {
            c2 = buf[k];
            putchar((' ' <= c2 && c2 <= '~')? c2: '.');
        }
        } else
        putchar('"');
        printf("\n");
        break;
    case RECMARK_ENDSEND:
    case RECMARK_ENDRECV:
        if (reverse)
        c = c==RECMARK_ENDSEND ? RECMARK_ENDRECV : RECMARK_ENDSEND;
        printf("end %s\n", c==RECMARK_ENDSEND? "send": "recv");
        break;
    case RECMARK_TIMEDELTA32:
    case RECMARK_TIMEDELTA8:
    case RECMARK_TIMESTART:
        show_time(f, c);
        break;
    default:
        printf("?%.2x\n");
    }
    }
}

/*
 * FCS lookup table as calculated by genfcstab.
 */
static u_short fcstab[256] = {
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

struct pkt {
    int cnt;
    int esc;
    int flags;
    struct compressor *comp;
    void *state;
    unsigned char buf[8192];
} spkt, rpkt;

/* Values for flags */
#define CCP_ISUP    1
#define CCP_ERROR   2
#define CCP_FATALERROR  4
#define CCP_ERR     (CCP_ERROR | CCP_FATALERROR)
#define CCP_DECOMP_RUN  8

unsigned char dbuf[8192];

void
dumpppp(f)
    FILE *f;
{
    int c, n, k;
    int nb, nl, dn, proto, rv;
    char *dir, *q;
    unsigned char *p, *r, *endp;
    unsigned char *d;
    unsigned short fcs;
    struct pkt *pkt;

    spkt.cnt = rpkt.cnt = 0;
    spkt.esc = rpkt.esc = 0;
    while ((c = getc(f)) != EOF) {
    switch (c) {
    case RECMARK_STARTSEND:
    case RECMARK_STARTRECV:
        if (reverse)
        c = c==RECMARK_STARTSEND ? RECMARK_STARTRECV :
            RECMARK_STARTSEND;
        dir = c==RECMARK_STARTSEND? "sent": "rcvd";
        pkt = c==RECMARK_STARTSEND? &spkt: &rpkt;
        n = getc(f);
        n = (n << 8) + getc(f);
        *(c==1? &tot_sent: &tot_rcvd) += n;
        for (; n > 0; --n) {
        c = getc(f);
        switch (c) {
        case EOF:
            printf("\nEOF\n");
            if (spkt.cnt > 0)
            printf("[%d bytes in incomplete send packet]\n",
                   spkt.cnt);
            if (rpkt.cnt > 0)
            printf("[%d bytes in incomplete recv packet]\n",
                   rpkt.cnt);
            exit(0);
        case '~':
            if (pkt->cnt > 0) {
            q = dir;
            if (pkt->esc) {
                printf("%s aborted packet:\n     ", dir);
                q = "    ";
            }
            nb = pkt->cnt;
            p = pkt->buf;
            pkt->cnt = 0;
            pkt->esc = 0;
            if (nb <= 2) {
                printf("%s short packet [%d bytes]:", q, nb);
                for (k = 0; k < nb; ++k)
                printf(" %.2x", p[k]);
                printf("\n");
                break;
            }
            fcs = PPP_INITFCS;
            for (k = 0; k < nb; ++k)
                fcs = PPP_FCS(fcs, p[k]);
            fcs &= 0xFFFF;
            nb -= 2;
            endp = p + nb;
            r = p;
            if (r[0] == 0xff && r[1] == 3)
                r += 2;
            if ((r[0] & 1) == 0)
                ++r;
            ++r;
            if (endp - r > mru)
                printf("     ERROR: length (%d) > MRU (%d)\n",
                   endp - r, mru);
            if (decompress && fcs == PPP_GOODFCS) {
                /* See if this is a CCP or compressed packet */
                d = dbuf;
                r = p;
                if (r[0] == 0xff && r[1] == 3) {
                *d++ = *r++;
                *d++ = *r++;
                }
                proto = r[0];
                if ((proto & 1) == 0)
                proto = (proto << 8) + r[1];
                if (proto == PPP_CCP) {
                handle_ccp(pkt, r + 2, endp - r - 2);
                } else if (proto == PPP_COMP) {
                if ((pkt->flags & CCP_ISUP)
                    && (pkt->flags & CCP_DECOMP_RUN)
                    && pkt->state
                    && (pkt->flags & CCP_ERR) == 0) {
                    rv = pkt->comp->decompress(pkt->state, r,
                            endp - r, d, &dn);
                    switch (rv) {
                    case DECOMP_OK:
                    p = dbuf;
                    nb = d + dn - p;
                    if ((d[0] & 1) == 0)
                        --dn;
                    --dn;
                    if (dn > mru)
                        printf("     ERROR: decompressed length (%d) > MRU (%d)\n", dn, mru);
                    break;
                    case DECOMP_ERROR:
                    printf("     DECOMPRESSION ERROR\n");
                    pkt->flags |= CCP_ERROR;
                    break;
                    case DECOMP_FATALERROR:
                    printf("     FATAL DECOMPRESSION ERROR\n");
                    pkt->flags |= CCP_FATALERROR;
                    break;
                    }
                }
                } else if (pkt->state
                       && (pkt->flags & CCP_DECOMP_RUN)) {
                pkt->comp->incomp(pkt->state, r, endp - r);
                }
            }
            do {
                nl = nb < 16? nb: 16;
                printf("%s ", q);
                for (k = 0; k < nl; ++k)
                printf(" %.2x", p[k]);
                for (; k < 16; ++k)
                printf("   ");
                printf("  ");
                for (k = 0; k < nl; ++k) {
                c = p[k];
                putchar((' ' <= c && c <= '~')? c: '.');
                }
                printf("\n");
                q = "    ";
                p += nl;
                nb -= nl;
            } while (nb > 0);
            if (fcs != PPP_GOODFCS)
                printf("     BAD FCS: (residue = %x)\n", fcs);
            }
            break;
        case '}':
            if (!pkt->esc) {
            pkt->esc = 1;
            break;
            }
            /* else fall through */
        default:
            if (pkt->esc) {
            c ^= 0x20;
            pkt->esc = 0;
            }
            pkt->buf[pkt->cnt++] = c;
            break;
        }
        }
        break;
    case RECMARK_ENDSEND:
    case RECMARK_ENDRECV:
        if (reverse)
        c = c==RECMARK_ENDSEND ? RECMARK_ENDRECV : RECMARK_ENDSEND;
        dir = c==RECMARK_ENDSEND ? "send": "recv";
        pkt = c==RECMARK_ENDSEND ? &spkt: &rpkt;
        printf("end %s", dir);
        if (pkt->cnt > 0)
        printf("  [%d bytes in incomplete packet]", pkt->cnt);
        printf("\n");
        break;
    case RECMARK_TIMEDELTA32:
    case RECMARK_TIMEDELTA8:
    case RECMARK_TIMESTART:
        show_time(f, c);
        break;
    default:
        printf("?%.2x\n");
    }
    }
}

extern struct compressor ppp_bsd_compress, ppp_deflate;

struct compressor *compressors[] = {
#if DO_BSD_COMPRESS
    &ppp_bsd_compress,
#endif
#if DO_DEFLATE
    &ppp_deflate,
#endif
    NULL
};

void
handle_ccp(cp, dp, len)
    struct pkt *cp;
    u_char *dp;
    int len;
{
    int clen;
    struct compressor **comp;

    if (len < CCP_HDRLEN)
    return;
    clen = CCP_LENGTH(dp);
    if (clen > len)
    return;

    switch (CCP_CODE(dp)) {
    case CCP_CONFACK:
    cp->flags &= ~(CCP_DECOMP_RUN | CCP_ISUP);
    if (clen < CCP_HDRLEN + CCP_OPT_MINLEN
        || clen < CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN))
        break;
    dp += CCP_HDRLEN;
    clen -= CCP_HDRLEN;
    for (comp = compressors; *comp != NULL; ++comp) {
        if ((*comp)->compress_proto == dp[0]) {
        if (cp->state != NULL) {
            (*cp->comp->decomp_free)(cp->state);
            cp->state = NULL;
        }
        cp->comp = *comp;
        cp->state = (*comp)->decomp_alloc(dp, CCP_OPT_LENGTH(dp));
        cp->flags |= CCP_ISUP;
        if (cp->state != NULL
            && (*cp->comp->decomp_init)
                (cp->state, dp, clen, 0, 0, 8192, 1))
            cp->flags = (cp->flags & ~CCP_ERR) | CCP_DECOMP_RUN;
        break;
        }
    }
    break;

    case CCP_CONFNAK:
    case CCP_CONFREJ:
    cp->flags &= ~(CCP_DECOMP_RUN | CCP_ISUP);
    break;

    case CCP_RESETACK:
    if (cp->flags & CCP_ISUP) {
        if (cp->state && (cp->flags & CCP_DECOMP_RUN)) {
        (*cp->comp->decomp_reset)(cp->state);
        cp->flags &= ~CCP_ERROR;
        }
    }
    break;
    }
}

void
show_time(f, c)
    FILE *f;
    int c;
{
    time_t t;
    int n;
    struct tm *tm;

    if (c == RECMARK_TIMESTART) {
    t = getc(f);
    t = (t << 8) + getc(f);
    t = (t << 8) + getc(f);
    t = (t << 8) + getc(f);
    printf("start %s", ctime(&t));
    start_time = t;
    start_time_tenths = 0;
    tot_sent = tot_rcvd = 0;
    } else {
    n = getc(f);
    if (c == RECMARK_TIMEDELTA32) {
        for (c = 3; c > 0; --c)
        n = (n << 8) + getc(f);
    }
    if (abs_times) {
        n += start_time_tenths;
        start_time += n / 10;
        start_time_tenths = n % 10;
        tm = localtime(&start_time);
        printf("time  %.2d:%.2d:%.2d.%d", tm->tm_hour, tm->tm_min,
           tm->tm_sec, start_time_tenths);
        printf("  (sent %d, rcvd %d)\n", tot_sent, tot_rcvd);
    } else
        printf("time  %.1fs\n", (double) n / 10);
    }
}