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/*
* $Id: ip_util.c,v 1.2 1997/12/25 23:28:10 lf Exp $
*
* Copyright (C) 1995,1996,1997 Lars Fenneberg
*
* Copyright 1992 Livingston Enterprises, Inc.
*
* Copyright 1992,1993, 1994,1995 The Regents of the University of Michigan
* and Merit Network, Inc. All Rights Reserved
*
* See the file COPYRIGHT for the respective terms and conditions.
* If the file is missing contact me at lf@elemental.net
* and I'll send you a copy.
*
*/
#include <config.h>
#include <includes.h>
#include <radiusclient.h>
/*
* Function: rc_get_ipaddr
*
* Purpose: return an IP address in host long notation from a host
* name or address in dot notation.
*
* Returns: 0 on failure
*/
UINT4 rc_get_ipaddr (char *host)
{
struct hostent *hp;
if (rc_good_ipaddr (host) == 0)
{
return ntohl(inet_addr (host));
}
else if ((hp = gethostbyname (host)) == (struct hostent *) NULL)
{
rc_log(LOG_ERR,"rc_get_ipaddr: couldn't resolve hostname: %s", host);
return ((UINT4) 0);
}
return ntohl((*(UINT4 *) hp->h_addr));
}
/*
* Function: rc_good_ipaddr
*
* Purpose: check for valid IP address in standard dot notation.
*
* Returns: 0 on success, -1 when failure
*
*/
int rc_good_ipaddr (char *addr)
{
int dot_count;
int digit_count;
if (addr == NULL)
return (-1);
dot_count = 0;
digit_count = 0;
while (*addr != '\0' && *addr != ' ')
{
if (*addr == '.')
{
dot_count++;
digit_count = 0;
}
else if (!isdigit (*addr))
{
dot_count = 5;
}
else
{
digit_count++;
if (digit_count > 3)
{
dot_count = 5;
}
}
addr++;
}
if (dot_count != 3)
{
return (-1);
}
else
{
return (0);
}
}
/*
* Function: rc_ip_hostname
*
* Purpose: Return a printable host name (or IP address in dot notation)
* for the supplied IP address.
*
*/
const char *rc_ip_hostname (UINT4 h_ipaddr)
{
struct hostent *hp;
UINT4 n_ipaddr = htonl (h_ipaddr);
if ((hp = gethostbyaddr ((char *) &n_ipaddr, sizeof (struct in_addr),
AF_INET)) == NULL) {
rc_log(LOG_ERR,"rc_ip_hostname: couldn't look up host by addr: %08lX", h_ipaddr);
}
return ((hp==NULL)?"unknown":hp->h_name);
}
/*
* Function: rc_getport
*
* Purpose: get the port number for the supplied request type
*
*/
unsigned short rc_getport(int type)
{
struct servent *svp;
if ((svp = getservbyname ((type==AUTH)?"radius":"radacct", "udp")) == NULL)
{
return ((type==AUTH)?PW_AUTH_UDP_PORT:PW_ACCT_UDP_PORT);
} else {
return ntohs ((unsigned short) svp->s_port);
}
}
/*
* Function: rc_own_hostname
*
* Purpose: get the hostname of this machine
*
* Returns -1 on failure, 0 on success
*
*/
int
rc_own_hostname(char *hostname, int len)
{
#ifdef HAVE_UNAME
struct utsname uts;
#endif
#if defined(HAVE_UNAME)
if (uname(&uts) < 0)
{
rc_log(LOG_ERR,"rc_own_hostname: couldn't get own hostname");
return -1;
}
strncpy(hostname, uts.nodename, len);
#elif defined(HAVE_GETHOSTNAME)
if (gethostname(hostname, len) < 0)
{
rc_log(LOG_ERR,"rc_own_hostname: couldn't get own hostname");
return -1;
}
#elif defined(HAVE_SYSINFO)
if (sysinfo(SI_HOSTNAME, hostname, len) < 0)
{
rc_log(LOG_ERR,"rc_own_hostname: couldn't get own hostname");
return -1;
}
#else
return -1;
#endif
return 0;
}
/*
* Function: rc_own_ipaddress
*
* Purpose: get the IP address of this host in host order
*
* Returns: IP address on success, 0 on failure
*
*/
UINT4 rc_own_ipaddress(void)
{
static UINT4 this_host_ipaddr = 0;
char hostname[256];
if (!this_host_ipaddr) {
if (rc_own_hostname(hostname, sizeof(hostname)) < 0)
return 0;
if ((this_host_ipaddr = rc_get_ipaddr (hostname)) == 0) {
rc_log(LOG_ERR, "rc_own_ipaddress: couldn't get own IP address");
return 0;
}
}
return this_host_ipaddr;
}
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