OS/2 Shareware BBS: 35 Internet/35-Internet.zip/radius_2.zip/util.c

C/C++ Source or Header | 1996-05-16 | 5KB | 231 lines

/*
 *
 *    RADIUS
 *    Remote Authentication Dial In User Service
 *
 *
 *    Livingston Enterprises, Inc.
 *    6920 Koll Center Parkway
 *    Pleasanton, CA   94566
 *
 *    Copyright 1992 Livingston Enterprises, Inc.
 *
 *    Permission to use, copy, modify, and distribute this software for any
 *    purpose and without fee is hereby granted, provided that this
 *    copyright and permission notice appear on all copies and supporting
 *    documentation, the name of Livingston Enterprises, Inc. not be used
 *    in advertising or publicity pertaining to distribution of the
 *    program without specific prior permission, and notice be given
 *    in supporting documentation that copying and distribution is by
 *    permission of Livingston Enterprises, Inc.
 *
 *    Livingston Enterprises, Inc. makes no representations about
 *    the suitability of this software for any purpose.  It is
 *    provided "as is" without express or implied warranty.
 *
 */

static char sccsid[] =
"@(#)util.c    1.5 Copyright 1992 Livingston Enterprises Inc";

#include    <sys/types.h>
#include    <sys/socket.h>
#include    <sys/time.h>
#include    <netinet/in.h>

#include    <stdio.h>
#include    <stdlib.h>
#include    <netdb.h>
#include    <pwd.h>
#include    <time.h>
#include    <ctype.h>

#include    "radius.h"


/*************************************************************************
 *
 *    Function: ip_hostname
 *
 *    Purpose: Return a printable host name (or IP address in dot notation)
 *         for the supplied IP address.
 *
 *************************************************************************/

char    *
ip_hostname(ipaddr)
UINT4    ipaddr;
{
    struct    hostent *hp;
    static char    hstname[128];
    UINT4    n_ipaddr;

    n_ipaddr = htonl(ipaddr);
    hp = gethostbyaddr((char *)&n_ipaddr, sizeof (struct in_addr), AF_INET);
    if (hp == 0) {
        ipaddr2str(hstname, ipaddr);
        return(hstname);
    }
    return(hp->h_name);
}

/*************************************************************************
 *
 *    Function: get_ipaddr
 *
 *    Purpose: Return an IP address in host long notation from a host
 *         name or address in dot notation.
 *
 *************************************************************************/

UINT4
get_ipaddr(host)
char    *host;
{
    struct hostent *hp;
/*    static char    buffer[32];*/
    UINT4        ipstr2long();

    if(good_ipaddr(host) == 0) {
        return(ipstr2long(host));
    }
    else if((hp = gethostbyname(host)) == (struct hostent *)NULL) {
        return((UINT4)0);
    }
    return(ntohl(*(UINT4 *)hp->h_addr));
}

/*************************************************************************
 *
 *    Function: good_ipaddr
 *
 *    Purpose: Check for valid IP address in standard dot notation.
 *
 *************************************************************************/
int
good_ipaddr(addr)
char    *addr;
{
    int    dot_count;
    int    digit_count;

    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: ipaddr2str
 *
 *    Purpose: Return an IP address in standard dot notation for the
 *         provided address in host long notation.
 *
 *************************************************************************/
void
ipaddr2str(buffer, ipaddr)
char    *buffer;
UINT4    ipaddr;
{
    int    addr_byte[4];
    int    i;
    UINT4    xbyte;

    for(i = 0;i < 4;i++) {
        xbyte = ipaddr >> (i*8);
        xbyte = xbyte & (UINT4)0x000000FF;
        addr_byte[i] = xbyte;
    }
    sprintf(buffer, "%u.%u.%u.%u", addr_byte[3], addr_byte[2],
        addr_byte[1], addr_byte[0]);
}

/*************************************************************************
 *
 *    Function: pairfree
 *
 *    Purpose: Release the memory used by a list of attribute-value
 *         pairs.
 *
 *************************************************************************/
void
pairfree(pair)
VALUE_PAIR    *pair;
{
    VALUE_PAIR    *next;

    while(pair != (VALUE_PAIR *)NULL) {
        next = pair->next;
        free(pair);
        pair = next;
    }
}

/*************************************************************************
 *
 *    Function: ipstr2long
 *
 *    Purpose: Return an IP address in host long notation from
 *         one supplied in standard dot notation.
 *
 *************************************************************************/

UINT4
ipstr2long(ip_str)
char    *ip_str;
{
    char    buf[6];
    char    *ptr;
    int    i;
    int    count;
    UINT4    ipaddr;
    int    cur_byte;

    ipaddr = (UINT4)0;
    for(i = 0;i < 4;i++) {
        ptr = buf;
        count = 0;
        *ptr = '\0';
        while(*ip_str != '.' && *ip_str != '\0' && count < 4) {
            if(!isdigit(*ip_str)) {
                return((UINT4)0);
            }
            *ptr++ = *ip_str++;
            count++;
        }
        if(count >= 4 || count == 0) {
            return((UINT4)0);
        }
        *ptr = '\0';
        cur_byte = atoi(buf);
        if(cur_byte < 0 || cur_byte > 255) {
            return((UINT4)0);
        }
        ip_str++;
        ipaddr = ipaddr << 8 | (UINT4)cur_byte;
    }
    return(ipaddr);
}