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/* $Id: utils.c 2433 2010-03-28 20:57:36Z aturner $ */
/*
* Copyright (c) 2001-2010 Aaron Turner.
* 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 "config.h"
#include "defines.h"
#include "common.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#ifdef DEBUG
extern int debug;
#endif
/**
* this is wrapped up in a #define safe_malloc
* This function, detects failures to malloc memory and zeros out the
* memory before returning
*/
void *
_our_safe_malloc(size_t len, const char *funcname, const int line, const char *file)
{
u_char *ptr;
if ((ptr = malloc(len)) == NULL) {
fprintf(stderr, "ERROR in %s:%s() line %d: Unable to malloc() %zu bytes", file, funcname, line, len);
exit(-1);
}
/* zero memory */
memset(ptr, 0, len);
/* wrapped inside an #ifdef for better performance */
dbgx(5, "Malloc'd %zu bytes in %s:%s() line %d", len, file, funcname, line);
return (void *)ptr;
}
/**
* this is wrapped up in a #define safe_realloc
* This function, detects failures to realloc memory and zeros
* out the NEW memory if len > current len. As always, remember
* to use it as:
* ptr = safe_realloc(ptr, size)
*/
void *
_our_safe_realloc(void *ptr, size_t len, const char *funcname, const int line, const char *file)
{
if ((ptr = realloc(ptr, len)) == NULL) {
fprintf(stderr, "ERROR: in %s:%s() line %d: Unable to remalloc() buffer to %zu bytes", file, funcname, line, len);
exit(-1);
}
dbgx(5, "Remalloc'd buffer to %zu bytes in %s:%s() line %d", len, file, funcname, line);
return ptr;
}
/**
* this is wrapped up in a #define safe_strdup
* This function, detects failures to realloc memory
*/
char *
_our_safe_strdup(const char *str, const char *funcname, const int line, const char *file)
{
char *newstr;
if ((newstr = (char *)malloc(strlen(str) + 1)) == NULL) {
fprintf(stderr, "ERROR in %s:%s() line %d: Unable to strdup() %zu bytes\n", file, funcname, line, strlen(str));
exit(-1);
}
memcpy(newstr, str, strlen(str) + 1);
return newstr;
}
/**
* calls free and sets to NULL.
*/
void
_our_safe_free(void *ptr, const char *funcname, const int line, const char *file)
{
if (ptr == NULL) {
fprintf(stderr, "ERROR in %s:%s() line %d: Unable to call free on a NULL ptr", file, funcname, line);
exit(-1);
}
free(ptr);
ptr = NULL;
}
/**
* Print various packet statistics
*/
void
packet_stats(struct timeval *begin, struct timeval *end,
COUNTER bytes_sent, COUNTER pkts_sent, COUNTER failed)
{
float bytes_sec = 0.0, mb_sec = 0.0, pkts_sec = 0.0;
double frac_sec;
struct timeval diff;
timersub(end, begin, &diff);
timer2float(&diff, frac_sec);
if (timerisset(&diff)) {
if (bytes_sent){
bytes_sec = bytes_sent / frac_sec;
mb_sec = (bytes_sec * 8) / (1024 * 1024);
}
if (pkts_sent)
pkts_sec = pkts_sent / frac_sec;
}
printf("Actual: " COUNTER_SPEC " packets (" COUNTER_SPEC " bytes) sent in %.02f seconds.",
pkts_sent, bytes_sent, frac_sec);
printf("\t\tRated: %.1f bps, %.2f Mbps, %.2f pps\n",
bytes_sec, mb_sec, pkts_sec);
if (failed)
printf(COUNTER_SPEC " write attempts failed from full buffers and were repeated\n",
failed);
}
/**
* reads a hexstring in the format of xx,xx,xx,xx spits it back into *hex
* up to hexlen bytes. Returns actual number of bytes returned. On error
* it just calls errx() since all errors are fatal.
*/
int
read_hexstring(const char *l2string, u_char *hex, const int hexlen)
{
int numbytes = 0;
unsigned int value;
char *l2byte;
u_char databyte;
char *token = NULL;
char *string;
string = safe_strdup(l2string);
if (hexlen <= 0)
err(-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(string, ",", &token);
sscanf(l2byte, "%x", &value);
if (value > 0xff)
errx(-1, "Invalid hex string byte: %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) {
warn("Hex buffer too small for data- skipping data");
return (++numbytes);
}
sscanf(l2byte, "%x", &value);
if (value > 0xff)
errx(-1, "Invalid hex string byte: %s", l2byte);
databyte = (u_char) value;
memcpy(&hex[numbytes], &databyte, 1);
}
numbytes++;
safe_free(string);
dbgx(1, "Read %d bytes of hex data", numbytes);
return (numbytes);
}
#ifdef USE_CUSTOM_INET_ATON
int
inet_aton(const char *name, struct in_addr *addr)
{
in_addr_t a = inet_addr (name);
addr->s_addr = a;
return a != (in_addr_t)-1;
}
#endif
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