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/* $Id$
*
* dhcpcd - DHCP client daemon -
* Copyright (C) 1996 - 1997 Yoichi Hariguchi <yoichi@fore.com>
*
* Dhcpcd is an RFC2131 and RFC1541 compliant DHCP client daemon.
*
* This 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dhcp.h"
#include "dhcp-options.h"
#include "error-handler.h"
#include "if.h"
#include "client.h"
void
setSockAddrIn(u_short port, u_long inaddr, struct sockaddr_in *saddr)
{
bzero((char *)saddr, sizeof(*saddr));
saddr->sin_family = AF_INET;
saddr->sin_addr.s_addr = inaddr;
saddr->sin_port = port;
}
void
openSendSocket(struct sockaddr_in *addr, int *s)
{
int optval = 1;
if ( (*s = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
logSysExit("socket (openSendSocket)");
}
if ( setsockopt(*s, SOL_SOCKET, SO_BROADCAST, &optval,
sizeof(optval)) < 0) {
logSysExit("setsockopt (openSendSocket)");
}
/* use DHCP client port for the source port because
* some servers do NOT use the DHCP client port
* BUT use the UDP source port number of the received
* datagram for the destination UDP port when it responds
* to clients.
*/
addr->sin_port = htons(DHCP_CLIENT_PORT);
#if 0
addr->sin_port = htons(0); /* appropriate unused port */
#endif
if ( bind(*s, (struct sockaddr *)addr, sizeof(*addr)) < 0 ) {
logSysExit("bind (openSendSocket)");
}
}
void
openRecvSocket(struct sockaddr_in *addr, int *s)
{
int optval = 1;
if ( (*s = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
logSysExit("socket (openRecvSocket)");
}
if ( setsockopt(*s, SOL_SOCKET, SO_BROADCAST, &optval,
sizeof(optval)) < 0) {
logSysExit("setsockopt (openRecvSocket)");
}
addr->sin_port = htons(DHCP_CLIENT_PORT);
if ( bind(*s, (struct sockaddr *)addr, sizeof(*addr)) < 0 ) {
logSysExit("bind (openRecvSocket)");
}
}
void openRawSocket(int *s, u_short type)
{
int optval = 1;
if ( (*s = socket(AF_INET, SOCK_PACKET, htons(type))) < 0 ) {
logSysExit("socket (openRawSocket)");
}
if ( setsockopt(*s, SOL_SOCKET, SO_BROADCAST,
&optval, sizeof(optval)) < 0 ) {
logSysExit("setsockopt (openRawSocket)");
}
}
int
rcvAndCheckDhcpMsg(int s, dhcpMessage *msg, u_long waitMsgType,
u_char *optp[], long timeout)
{
fd_set fdset;
time_t prevTime;
struct sockaddr_in addr;
struct timeval tm;
int len;
bzero((char *)msg, sizeof(*msg));
bzero((char *)&addr, sizeof(addr));
tm.tv_sec = 0;
time(&prevTime);
while ( timeout > 0 ) {
FD_ZERO(&fdset);
FD_SET(s, &fdset);
tm.tv_usec = timeout;
if ( select(s+1, &fdset,
(fd_set *)NULL, (fd_set *)NULL, &tm) < 0 ) {
logSysRet("select (rcvAndCheckDhcpMsg)");
return 0; /* receive unsuccessful */
}
len = sizeof(*msg);
if ( FD_ISSET(s, &fdset) ) {
if ( recvfrom(s, (char *)msg, len, 0,
(struct sockaddr *)&addr, &len) < 0 ) {
logSysRet("recvfrom (rcvAndCheckDhcpMsg)");
return 0; /* receive unsuccessful */
}
if ( parseDhcpMsg(optp, msg) ) {
if ( waitMsgType & (1 << (*(optp[OmsgType]+1)-1)) ) {
return 1;
}
}
}
timeout -= (time(NULL) - prevTime)*1000000;
time(&prevTime);
}
return 0; /* receive timeout */
}
int
waitChkReXmitMsg(int sRecv, dhcpMessage *pMsgRecv,
int sSend, dhcpMessage *pMsgSend,
struct sockaddr_in *addr, u_long waitMsgType,
u_char *optp[], int nretry)
{
long tm;
int try;
tm = getNextTimeout(INIT_TIMEOUT);
try = nretry;
while ( nretry == 0 || try-- ) {
if ( rcvAndCheckDhcpMsg(sRecv, pMsgRecv, waitMsgType, optp, tm) ) {
return 1;
}
if ( sendto(sSend, (char *)pMsgSend, sizeof(*pMsgSend), 0,
(struct sockaddr *)addr, sizeof(*addr)) < 0 ) {
logSysExit("sendto (waitChkReXmitMsg)");
}
tm = getNextTimeout(NEXT_TIMEOUT);
}
return 0;
}
void
setWaitMsgType(int type, u_int *ptype)
{
*ptype |= (1 << (type-1));
}
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