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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.
*/
void setSockAddrIn(u_short port, u_long inaddr, struct sockaddr_in *saddr);
/* requires: 'port' containing port number (network byte order)
* 'inaddr' containing IP address (network byte order)
* 'saddr' pointing to the structure to be configured.
* effects: it initializes '*saddr', and assigns other parameters to '*saddr'
* modifies: *saddr
* return: Nothing
*/
void openSendSocket(struct sockaddr_in *addr, int *s);
/* requires: 'addr' points sender's IP address.
* 's' points the file descripter used by caller.
* effects: it opens a socket '*s' for sending DHCP messages, and bind
* '*addr' to *s. port # is selected by the system. it also enables
* itself to send broadcast messages
* modifies: *addr, *s
* return: Nothing
*/
void openRecvSocket(struct sockaddr_in *addr, int *s);
/* requires: 'addr' points sender's IP address.
* 's' points the file descripter used by caller.
* effects: it opens a socket '*s' for sending DHCP messages, and bind
* '*addr' to *s. port # is selected by the system. it also enables
* itself to send broadcast messages
* modifies: *addr, *s
* return: Nothing
*/
void openRawSocket(int *s, u_short type);
/* requires: 's' points the file descripter used by caller.
* 'type' containing ethernet frame type (ETH_P_XXXX)
* effects: it opens a socket '*s' for sending raw datalink layer frame
* it also enables the process to send/receive broadcast frames
* modifies: *s
* return: Nothing
*/
int rcvAndCheckDhcpMsg(int s, dhcpMessage *msg, u_long waitMsgType,
u_char *optp[], long timeout);
/* requires: 's' containing the socket descpipter to receive a DHCP packet
* 'msg' pointing the structure for received DHCP packet
* 'waitMsgType' containing the DHCP message types for which you
* are waiting in bit map. the 'DHCP_OFFER'th bit in waitMsgType
* must be 1 if you are waiting for DHCPOFFER message.
* 'optp'
* effects: it reads the input from the socket 's' and checkes whether
* the packet is a correct DHCP message for 'timeout' seconds.
* it saves pointers to each DHCP option field in '*msg' to
* 'optp[i]' and return 1. See 'parseDhcpMsg' for more details about
* how those pointers are set to 'opt[i]'.
* modifies: *msg, optp[i]
* return: 1 if it received a correct DHCP packet.
* 0 if timeout.
*/
int waitChkReXmitMsg(int sRecv, dhcpMessage *pMsgRecv,
int sSend, dhcpMessage *pMsgSend,
struct sockaddr_in *addr, u_long waitMsgType,
u_char *optp[], int nretry);
void setWaitMsgType(int type, u_int *ptype);
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