/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Jelmer Vernooij 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 . */ #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; }