freebsd-dev/lib/libatm/ip_addr.c
Poul-Henning Kamp 1820df7a2d Add new files for HARP3
Host ATM Research Platform (HARP), Network Computing Services, Inc.
This software was developed with the support of the Defense Advanced
Research Projects Agency (DARPA).
1998-09-15 08:23:17 +00:00

168 lines
3.7 KiB
C

/*
*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*
* @(#) $Id: ip_addr.c,v 1.1 1998/07/09 21:45:42 johnc Exp $
*
*/
/*
* User Space Library Functions
* ----------------------------
*
* IP address utilities
*
*/
#ifndef lint
static char *RCSid = "@(#) $Id: ip_addr.c,v 1.1 1998/07/09 21:45:42 johnc Exp $";
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <netdb.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netatm/port.h>
#include <netatm/atm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_ioctl.h>
#include "libatm.h"
/*
* Get IP address
*
* Return an IP address in a socket address structure, given a character
* string with a domain name or a dotted decimal number.
*
* Arguments:
* p pointer to a host name or IP address
*
* Returns:
* null error was encountered
* struct sockaddr_in * a pointer to a socket address with the
* requested IP address
*
*/
struct sockaddr_in *
get_ip_addr(p)
char *p;
{
struct hostent *ip_host;
static struct sockaddr_in sin;
/*
* Get IP address of specified host name
*/
UM_ZERO(&sin, sizeof(sin));
sin.sin_family = AF_INET;
if (p[0] >= '0' && p[0] <= '9') {
/*
* IP address is in dotted decimal format
*/
if ((sin.sin_addr.s_addr = inet_addr(p)) == -1) {
return((struct sockaddr_in *)0);
}
} else {
/*
* Host name is in domain name system format
*/
ip_host = gethostbyname(p);
if (!ip_host ||
ip_host->h_addrtype != AF_INET) {
return((struct sockaddr_in *)0);
}
sin.sin_addr.s_addr = *(u_long *)ip_host->h_addr_list[0];
}
return(&sin);
}
/*
* Format an IP address
*
* Return a text-formatted string with an IP address and domain name
* given a sockaddr_in with an IP address.
*
* Arguments:
* p pointer to sockaddr_in with an IP address
*
* Returns:
* char * pointer to a text-formatted string
*
*/
char *
format_ip_addr(addr)
struct in_addr *addr;
{
static char host_name[128];
char *ip_num;
struct hostent *ip_host;
/*
* Initialize
*/
UM_ZERO(host_name, sizeof(host_name));
/*
* Check for a zero address
*/
if (!addr || addr->s_addr == 0) {
return("-");
}
/*
* Get address in dotted decimal format
*/
ip_num = inet_ntoa(*addr);
/*
* Look up name in DNS
*/
ip_host = gethostbyaddr((char *)addr, sizeof(addr), AF_INET);
if (ip_host && ip_host->h_name &&
strlen(ip_host->h_name)) {
/*
* Return host name followed by dotted decimal address
*/
strcpy(host_name, ip_host->h_name);
strcat(host_name, " (");
strcat(host_name, ip_num);
strcat(host_name, ")");
return(host_name);
} else {
/*
* No host name -- just return dotted decimal address
*/
return(ip_num);
}
}