165 lines
2.7 KiB
C
165 lines
2.7 KiB
C
/*
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* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <string.h>
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static int
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readname_loop(char *packet, char **src, char *dst, size_t length, size_t loop)
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{
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char *dummy;
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char *s;
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char *d;
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int len;
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char c;
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if (loop <= 0)
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return 0;
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len = 0;
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s = *src;
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d = dst;
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while(*s && len < length - 2) {
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c = *s++;
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/* is this a compressed label? */
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if((c & 0xc0) == 0xc0) {
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dummy = packet + (((s[-1] & 0x3f) << 8) | s[0]);
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len += readname_loop(packet, &dummy, d, length - len, loop - 1);
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goto end;
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}
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while(c && len < length - 1) {
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*d++ = *s++;
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len++;
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c--;
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}
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if (len >= length - 1) {
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break; /* We used up all space */
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}
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if (*s != 0) {
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*d++ = '.';
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len++;
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}
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}
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dst[len++] = '\0';
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end:
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(*src) = s+1;
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return len;
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}
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int
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readname(char *packet, char **src, char *dst, size_t length)
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{
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return readname_loop(packet, src, dst, length, 10);
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}
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int
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readshort(char *packet, char **src, short *dst)
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{
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unsigned char *p;
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p = *src;
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*dst = (p[0] << 8) | p[1];
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(*src) += sizeof(short);
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return sizeof(short);
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}
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int
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readlong(char *packet, char **src, long *dst)
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{
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unsigned char *p;
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p = *src;
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*dst = ((long)p[0] << 24)
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| ((long)p[1] << 16)
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| ((long)p[2] << 8)
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| ((long)p[3]);
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(*src) += sizeof(long);
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return sizeof(long);
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}
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int
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readdata(char *packet, char **src, char *dst, size_t len)
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{
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if (len < 0)
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return 0;
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memcpy(dst, *src, len);
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(*src) += len;
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return len;
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}
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int
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putbyte(char **dst, char value)
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{
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**dst = value;
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(*dst)++;
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return sizeof(char);
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}
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int
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putshort(char **dst, short value)
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{
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unsigned char *p;
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p = *dst;
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*p++ = (value >> 8);
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*p++ = value;
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(*dst) = p;
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return sizeof(short);
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}
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int
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putlong(char **dst, long value)
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{
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unsigned char *p;
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p = *dst;
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*p++ = (value >> 24);
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*p++ = (value >> 16);
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*p++ = (value >> 8);
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*p++ = (value);
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(*dst) = p;
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return sizeof(long);
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}
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int
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putdata(char **dst, char *data, size_t len)
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{
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if (len < 0)
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return 0;
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memcpy(*dst, data, len);
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(*dst) += len;
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return len;
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}
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