зеркало из https://github.com/mozilla/gecko-dev.git
162 строки
3.2 KiB
C
162 строки
3.2 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is SniffURI.
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*
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* The Initial Developer of the Original Code is
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* Erik van der Poel <erik@vanderpoel.org>.
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* Portions created by the Initial Developer are Copyright (C) 1998-2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** */
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#include "all.h"
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#define server (unsigned char *) "host.domain.com"
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#define QR 0 /* query */
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#define OPCODE 0 /* standard query */
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#define AA 0 /* authoritative answer */
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#define TC 0 /* truncation */
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#define RD 1 /* recursion desired */
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#define RA 0 /* recursion available */
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#define Z 0 /* reserved */
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#define RCODE 0 /* response code */
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static unsigned short ID = 0xbeef;
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static unsigned char *
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putDomainName(unsigned char *p, char *name)
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{
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char *begin;
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char *q;
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q = name;
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while (*q)
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{
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begin = q;
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while (*q && (*q != '.'))
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{
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q++;
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}
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if (q - begin > 0)
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{
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*p++ = q - begin;
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q = begin;
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while (*q && (*q != '.'))
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{
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*p++ = *q++;
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}
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if (*q == '.')
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{
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q++;
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}
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}
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}
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*p++ = 0;
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return p;
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}
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int
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main(int argc, char *argv[])
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{
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unsigned char buf[1024];
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int bytesTransferred;
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int c;
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int fd;
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int i;
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int len;
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unsigned char *p;
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if (!netInit())
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{
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return 1;
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}
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if (!threadInit())
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{
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return 1;
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}
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fd = netConnect(NULL, server, 53);
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if (fd < 0)
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{
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fprintf(stderr, "netConnect failed\n");
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return 1;
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}
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p = buf + 2;
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p[0] = (ID >> 8);
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p[1] = (ID & 0xff);
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p[2] = (QR | OPCODE | AA | TC | RD);
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p[3] = (RA | Z | RCODE);
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p[4] = 0; /* QDCOUNT */
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p[5] = 1; /* QDCOUNT */
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p[6] = 0; /* ANCOUNT */
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p[7] = 0; /* ANCOUNT */
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p[8] = 0; /* NSCOUNT */
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p[9] = 0; /* NSCOUNT */
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p[10] = 0; /* ARCOUNT */
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p[11] = 0; /* ARCOUNT */
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p = putDomainName(&p[12], "w3.org");
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/* A = 1 = host address */
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p[0] = 0;
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p[1] = 15; /* MX = mail exchange */
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p[2] = 0;
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p[3] = 1; /* IN = Internet */
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len = (p + 4) - buf;
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buf[0] = 0;
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buf[1] = len - 2;
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bytesTransferred = send(fd, buf, len, 0);
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if (bytesTransferred != len)
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{
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fprintf(stderr, "wrong number of bytes written\n");
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return 1;
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}
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bytesTransferred = recv(fd, buf, sizeof(buf), 0);
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for (i = 0; i < bytesTransferred; i++)
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{
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c = buf[i];
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if ((0x20 <= c) && (c <= 0x7e))
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{
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printf("%02d: 0x%02x = '%c'\n", i, c, c);
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}
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else
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{
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printf("%02d: 0x%02x\n", i, c);
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}
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}
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printf("%d bytes read\n", bytesTransferred);
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printf("ID 0x%04x\n", (buf[2] << 8) | buf[3]);
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printf("QR %d\n", buf[4] >> 7);
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printf("RCODE %d\n", buf[5] & 0xf);
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printf("QDCOUNT %d\n", (buf[ 6] << 8) | buf[ 7]);
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printf("ANCOUNT %d\n", (buf[ 8] << 8) | buf[ 9]);
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printf("NSCOUNT %d\n", (buf[10] << 8) | buf[11]);
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printf("ARCOUNT %d\n", (buf[12] << 8) | buf[13]);
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return 0;
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}
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