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/*
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Lawrence Berkeley Laboratory,
* Berkeley, CA. The name of the University may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/emulate/inet.c,v 1.5 2000/02/08 23:35:13 salehi Exp $ (LBL)";
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef WIN32
#include <windows.h>
#include <winsock.h>
#else
#include <sys/param.h>
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>
#endif
#include "config.h"
#include "inet.h"
u_int32_t
LookupHostAddr(const char *s)
{
if (isdigit(*s))
return (u_int32_t)inet_addr(s);
else {
struct hostent *hp = gethostbyname(s);
if (hp == 0)
/*XXX*/
return (0);
return *((u_int32_t **)hp->h_addr_list)[0];
}
}
u_int32_t
LookupLocalAddr(void)
{
static u_int32_t local_addr;
char name[MAXHOSTNAMELEN];
if (local_addr == 0) {
(void)gethostname(name, sizeof(name));
local_addr = LookupHostAddr(name);
}
return (local_addr);
}
/*
* A faster replacement for inet_ntoa().
* Extracted from tcpdump 2.1.
*/
const char *
intoa(u_int32_t addr)
{
register char *cp;
register u_int byte;
register int n;
static char buf[sizeof(".xxx.xxx.xxx.xxx")];
NTOHL(addr);
cp = &buf[sizeof buf];
*--cp = '\0';
n = 4;
do {
byte = addr & 0xff;
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0) {
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0)
*--cp = byte + '0';
}
*--cp = '.';
addr >>= 8;
} while (--n > 0);
return cp + 1;
}
char *
InetNtoa(u_int32_t addr)
{
const char *s = intoa(addr);
char *p = (char *)malloc(strlen(s) + 1);
strcpy(p, s);
return p;
}
char *
LookupHostName(u_int32_t addr)
{
char *p;
struct hostent* hp;
/*XXX*/
if (IN_MULTICAST(ntohl(addr)))
return (InetNtoa(addr));
hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET);
if (hp == 0)
return InetNtoa(addr);
p = (char *)malloc(strlen(hp->h_name) + 1);
strcpy(p, hp->h_name);
return p;
}
/*
* in_cksum --
* Checksum routine for Internet Protocol family headers (C Version)
* [taken from ping.c]
*/
u_short
in_cksum(addr, len)
u_short *addr;
int len;
{
register int nleft = len;
register u_short *w = addr;
register int sum = 0;
u_short answer = 0;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum), we add
* sequential 16 bit words to it, and at the end, fold back all the
* carry bits from the top 16 bits into the lower 16 bits.
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if (nleft == 1) {
*(u_char *)(&answer) = *(u_char *)w ;
sum += answer;
}
/* add back carry outs from top 16 bits to low 16 bits */
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return(answer);
}
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <stdio.h>
void
print_ip(struct ip *ip)
{
char buf[64];
u_short off = ntohs(ip->ip_off);
printf("IP v:%d, ihl:%d, tos:%d, id:%d, off:%d [df:%d, mf:%d], sum:%d, prot:%d\n",
ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_id),
off & IP_OFFMASK,
(off & IP_DF) ? 1 : 0,
(off & IP_MF) ? 1 : 0,
ip->ip_sum, ip->ip_p);
#ifdef HAVE_ADDR2ASCII
addr2ascii(AF_INET, &ip->ip_src, 4, buf);
#else
inet_ntoa(ip->ip_src);
#endif /* HAVE_ADDR2ASCII */
#ifdef HAVE_ADDR2ASCII
printf("IP len:%d ttl: %d, src: %s, dst: %s\n",
ntohs(ip->ip_len), ip->ip_ttl, buf,
addr2ascii(AF_INET, &ip->ip_dst, 4, 0));
#else
printf("IP len:%d ttl: %d, src: %s, dst: %s\n",
ntohs(ip->ip_len), ip->ip_ttl, buf,
inet_ntoa(ip->ip_src));
#endif /* HAVE_ADDR2ASCII */
}
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