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utils.c
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/* $Id: utils.c,v 1.8 2004/05/14 17:32:26 aturner Exp $ */
/*
* Copyright (c) 2001-2004 Aaron Turner, Matt Bing.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright owners nor the names of its
* contributors may be used to endorse or promote products derived from * this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <regex.h>
#include "config.h"
#include "tcpreplay.h"
#include "utils.h"
#include "err.h"
extern int maxpacket;
extern struct options options;
int
read_hexstring(char *l2string, char *hex, int hexlen)
{
int numbytes = 0;
unsigned int value;
char *l2byte;
u_char databyte;
char *token = NULL;
if (hexlen <= 0)
errx(1, "Hex buffer must be > 0");
memset(hex, '\0', hexlen);
/* data is hex, comma seperated, byte by byte */
/* get the first byte */
l2byte = strtok_r(l2string, ",", &token);
sscanf(l2byte, "%x", &value);
if (value > 0xff)
errx(1, "Invalid hex byte passed to -2: %s", l2byte);
databyte = (u_char) value;
memcpy(&hex[numbytes], &databyte, 1);
/* get remaining bytes */
while ((l2byte = strtok_r(NULL, ",", &token)) != NULL) {
numbytes++;
if (numbytes + 1 > hexlen) {
warnx("Hex buffer too small for data- skipping data");
return (++numbytes);
}
sscanf(l2byte, "%x", &value);
if (value > 0xff)
errx(1, "Invalid hex byte passed to -2: %s", l2byte);
databyte = (u_char) value;
memcpy(&hex[numbytes], &databyte, 1);
}
numbytes++;
dbg(1, "Read %d bytes of layer 2 data", numbytes);
return (numbytes);
}
/* whorishly appropriated from fragroute-1.2 */
int
argv_create(char *p, int argc, char *argv[])
{
int i;
for (i = 0; i < argc - 1; i++) {
while (*p != '\0' && isspace((int)*p))
*p++ = '\0';
if (*p == '\0')
break;
argv[i] = p;
while (*p != '\0' && !isspace((int)*p))
p++;
}
p[0] = '\0';
argv[i] = NULL;
return (i);
}
/*
* converts a string representation of a MAC address, based on
* non-portable ether_aton()
*/
void
mac2hex(const char *mac, char *dst, int len)
{
int i;
long l;
char *pp;
if (len < 6)
return;
while (isspace(*mac))
mac++;
/* expect 6 hex octets separated by ':' or space/NUL if last octet */
for (i = 0; i < 6; i++) {
l = strtol(mac, &pp, 16);
if (pp == mac || l > 0xFF || l < 0)
return;
if (!(*pp == ':' || (i == 5 && (isspace(*pp) || *pp == '\0'))))
return;
dst[i] = (u_char) l;
mac = pp + 1;
}
}
/*
* returns a pointer to the layer 4 header which is just beyond the IP header
*/
void *
get_layer4(ip_hdr_t * ip_hdr)
{
void *ptr;
ptr = (u_int32_t *) ip_hdr + ip_hdr->ip_hl;
return ((void *)ptr);
}