bin/tests/wire_test.c

/*
 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

/* $Id: wire_test.c,v 1.67 2007/06/19 23:46:59 tbox Exp $ */

#include <config.h>

#include <stdlib.h>

#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/result.h>

#include "printmsg.h"

int parseflags = 0;
isc_mem_t *mctx;
isc_boolean_t printmemstats = ISC_FALSE;
isc_boolean_t dorender = ISC_FALSE;

static void
process_message(isc_buffer_t *source);

static inline void
CHECKRESULT(isc_result_t result, const char *msg) {
    if (result != ISC_R_SUCCESS) {
        printf("%s: %s\n", msg, dns_result_totext(result));

        exit(1);
    }
}

static int
fromhex(char c) {
    if (c >= '0' && c <= '9')
        return (c - '0');
    else if (c >= 'a' && c <= 'f')
        return (c - 'a' + 10);
    else if (c >= 'A' && c <= 'F')
        return (c - 'A' + 10);

    printf("bad input format: %02x\n", c);
    exit(3);
    /* NOTREACHED */
}

static void
usage(void) {
    fprintf(stderr, "wire_test [-p] [-b] [-s] [-r]\n");
    fprintf(stderr, "\t-p\tPreserve order of the records in messages\n");
    fprintf(stderr, "\t-b\tBest-effort parsing (ignore some errors)\n");
    fprintf(stderr, "\t-s\tPrint memory statistics\n");
    fprintf(stderr, "\t-r\tAfter parsing, re-render the message\n");
    fprintf(stderr, "\t-t\tTCP mode - ignore the first 2 bytes\n");
}

int
main(int argc, char *argv[]) {
    char *rp, *wp;
    unsigned char *bp;
    isc_buffer_t source;
    size_t len, i;
    int n;
    FILE *f;
    isc_boolean_t need_close = ISC_FALSE;
    unsigned char b[64 * 1024];
    char s[4000];
    isc_boolean_t tcp = ISC_FALSE;
    int ch;

    mctx = NULL;
    RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);

    while ((ch = isc_commandline_parse(argc, argv, "pbsrt")) != -1) {
        switch (ch) {
            case 'p':
                parseflags |= DNS_MESSAGEPARSE_PRESERVEORDER;
                break;
            case 'b':
                parseflags |= DNS_MESSAGEPARSE_BESTEFFORT;
                break;
            case 's':
                printmemstats = ISC_TRUE;
                break;
            case 'r':
                dorender = ISC_TRUE;
                break;
            case 't':
                tcp = ISC_TRUE;
                break;
            default:
                usage();
                exit(1);
        }
    }

    argc -= isc_commandline_index;
    argv += isc_commandline_index;

    if (argc > 1) {
        f = fopen(argv[1], "r");
        if (f == NULL) {
            printf("fopen failed\n");
            exit(1);
        }
        need_close = ISC_TRUE;
    } else
        f = stdin;

    bp = b;
    while (fgets(s, sizeof(s), f) != NULL) {
        rp = s;
        wp = s;
        len = 0;
        while (*rp != '\0') {
            if (*rp == '#')
                break;
            if (*rp != ' ' && *rp != '\t' &&
                *rp != '\r' && *rp != '\n') {
                *wp++ = *rp;
                len++;
            }
            rp++;
        }
        if (len == 0U)
            break;
        if (len % 2 != 0U) {
            printf("bad input format: %lu\n", (unsigned long)len);
            exit(1);
        }
        if (len > sizeof(b) * 2) {
            printf("input too long\n");
            exit(2);
        }
        rp = s;
        for (i = 0; i < len; i += 2) {
            n = fromhex(*rp++);
            n *= 16;
            n += fromhex(*rp++);
            *bp++ = n;
        }
    }

    if (need_close)
        fclose(f);

    if (tcp) {
        unsigned char *p = b;
        while (p < bp) {
            unsigned int len;

            if (p + 2 > bp) {
                printf("premature end of packet\n");
                exit(1);
            }
            len = p[0] << 8 | p[1];

            if (p + 2 + len > bp) {
                printf("premature end of packet\n");
                exit(1);
            }
            isc_buffer_init(&source, p + 2, len);
            isc_buffer_add(&source, len);
            process_message(&source);
            p += 2 + len;
        }
    } else {
        isc_buffer_init(&source, b, sizeof(b));
        isc_buffer_add(&source, bp - b);
        process_message(&source);
    }

    if (printmemstats)
        isc_mem_stats(mctx, stdout);
    isc_mem_destroy(&mctx);

    return (0);
}

static void
process_message(isc_buffer_t *source) {
    dns_message_t *message;
    isc_result_t result;
    int i;

    message = NULL;
    result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message);
    CHECKRESULT(result, "dns_message_create failed");

    result = dns_message_parse(message, source, parseflags);
    if (result == DNS_R_RECOVERABLE)
        result = ISC_R_SUCCESS;
    CHECKRESULT(result, "dns_message_parse failed");

    result = printmessage(message);
    CHECKRESULT(result, "printmessage() failed");

    if (printmemstats)
        isc_mem_stats(mctx, stdout);

    if (dorender) {
        unsigned char b2[64 * 1024];
        isc_buffer_t buffer;
        dns_compress_t cctx;

        isc_buffer_init(&buffer, b2, sizeof(b2));

        /*
         * XXXMLG
         * Changing this here is a hack, and should not be done in
         * reasonable application code, ever.
        */
        message->from_to_wire = DNS_MESSAGE_INTENTRENDER;

        for (i = 0; i < DNS_SECTION_MAX; i++)
            message->counts[i] = 0;  /* Another hack XXX */

        result = dns_compress_init(&cctx, -1, mctx);
        CHECKRESULT(result, "dns_compress_init() failed");

        result = dns_message_renderbegin(message, &cctx, &buffer);
        CHECKRESULT(result, "dns_message_renderbegin() failed");

        result = dns_message_rendersection(message,
                           DNS_SECTION_QUESTION, 0);
        CHECKRESULT(result,
                "dns_message_rendersection(QUESTION) failed");

        result = dns_message_rendersection(message,
                           DNS_SECTION_ANSWER, 0);
        CHECKRESULT(result,
                "dns_message_rendersection(ANSWER) failed");

        result = dns_message_rendersection(message,
                           DNS_SECTION_AUTHORITY, 0);
        CHECKRESULT(result,
                "dns_message_rendersection(AUTHORITY) failed");

        result = dns_message_rendersection(message,
                           DNS_SECTION_ADDITIONAL, 0);
        CHECKRESULT(result,
                "dns_message_rendersection(ADDITIONAL) failed");

        dns_message_renderend(message);

        dns_compress_invalidate(&cctx);

        message->from_to_wire = DNS_MESSAGE_INTENTPARSE;
        dns_message_destroy(&message);

        printf("Message rendered.\n");
        if (printmemstats)
            isc_mem_stats(mctx, stdout);

        result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE,
                        &message);
        CHECKRESULT(result, "dns_message_create failed");

        result = dns_message_parse(message, &buffer, parseflags);
        CHECKRESULT(result, "dns_message_parse failed");

        result = printmessage(message);
        CHECKRESULT(result, "printmessage() failed");
    }
    dns_message_destroy(&message);
}