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/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001-2002
Copyright (C) Simo Sorce 2001
Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
Copyright (C) James J Myers 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/**
Interpret an internet address or name into an IP address in 4 byte form.
**/
_PUBLIC_ uint32_t interpret_addr(const char *str)
{
struct hostent *hp;
uint32_t res;
if (str == NULL || *str == 0 ||
strcmp(str,"0.0.0.0") == 0) {
return 0;
}
if (strcmp(str,"255.255.255.255") == 0) {
return 0xFFFFFFFF;
}
/* recognise 'localhost' as a special name. This fixes problems with
some hosts that don't have localhost in /etc/hosts */
if (strcasecmp(str,"localhost") == 0) {
str = "127.0.0.1";
}
/* if it's in the form of an IP address then get the lib to interpret it */
if (is_ipaddress(str)) {
res = inet_addr(str);
} else {
/* otherwise assume it's a network name of some sort and use
sys_gethostbyname */
if ((hp = sys_gethostbyname(str)) == 0) {
DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
return 0;
}
if(hp->h_addr == NULL) {
DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
return 0;
}
memcpy((char *)&res,(char *)hp->h_addr, 4);
}
if (res == (uint32_t)-1)
return(0);
return(res);
}
/**
A convenient addition to interpret_addr().
**/
_PUBLIC_ struct in_addr interpret_addr2(const char *str)
{
struct in_addr ret;
uint32_t a = interpret_addr(str);
ret.s_addr = a;
return ret;
}
/**
Check if an IP is the 0.0.0.0.
**/
_PUBLIC_ bool is_zero_ip(struct in_addr ip)
{
return ip.s_addr == 0;
}
/**
Are two IPs on the same subnet?
**/
_PUBLIC_ bool same_net(struct in_addr ip1, struct in_addr ip2, struct in_addr mask)
{
uint32_t net1,net2,nmask;
nmask = ntohl(mask.s_addr);
net1 = ntohl(ip1.s_addr);
net2 = ntohl(ip2.s_addr);
return((net1 & nmask) == (net2 & nmask));
}
/**
Return true if a string could be a pure IP address.
**/
_PUBLIC_ bool is_ipaddress(const char *str)
{
bool pure_address = true;
int i;
if (str == NULL) return false;
for (i=0; pure_address && str[i]; i++)
if (!(isdigit((int)str[i]) || str[i] == '.'))
pure_address = false;
/* Check that a pure number is not misinterpreted as an IP */
pure_address = pure_address && (strchr(str, '.') != NULL);
return pure_address;
}
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