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/**********************************************************************
* vanessa_socket_host.c December 1999
* Horms horms@verge.net.au
*
* Operations on host names
*
* vanessa_socket
* Library to simplify handling of TCP sockets
* Copyright (C) 1999-2004 Horms
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
**********************************************************************/
#include "vanessa_socket.h"
/**********************************************************************
* vanessa_socket_host_in_addr
* A host is given as a string either as a host name or IP address
* as a dotted quad. The host is used to seed an in_addr structure
* with a binary representation of the IP address of the host
* in network byte order.
* pre: host: hostname or IP address
* If NULL then INADDR_ANY will be converted to network
* byte order and used as the address.
* in: pointer to an in_addr structure.
* flag: Flags. If the VANESSA_SOCKET_NO_LOOKUP bit is set then
* no hostname lookups will be performed. That is the
* host given as an argument should be an IP address
* post: none
* return: 0 on success
* -1 on error
**********************************************************************/
int vanessa_socket_host_in_addr(const char *host,
struct in_addr *in,
const vanessa_socket_flag_t flag)
{
struct hostent *hp;
extern int h_errno;
if (host == NULL) {
in->s_addr = htonl(INADDR_ANY);
} else if (flag & VANESSA_SOCKET_NO_LOOKUP) {
if (inet_aton(host, in) == 0) {
VANESSA_LOGGER_DEBUG_UNSAFE("invalid IP address (%s): "
"Are you trying to resolve a hostname "
"with no lookup enabled?", host);
return (-1);
}
} else {
if ((hp = gethostbyname(host)) == NULL) {
VANESSA_LOGGER_DEBUG_UNSAFE("gethostbyname (%s): %s",
host,
vanessa_logger_strherror(h_errno));
return (-1);
}
memcpy(in, hp->h_addr, hp->h_length);
}
return (0);
}
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