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