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skrzyp |
/*==========================================================================
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//
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// dhcp_prot.c
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//
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// DHCP protocol implementation for DHCP client
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): hmt
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// Contributors: gthomas, andrew.lunn@ascom.ch
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// Date: 2000-07-01
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// Purpose: DHCP support
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// Description:
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//
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//####DESCRIPTIONEND####
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//
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//========================================================================*/
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#include <pkgconf/system.h>
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#include <pkgconf/net.h>
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#ifdef CYGPKG_NET_DHCP
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#ifdef CYGPKG_NET_SNTP
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#include <pkgconf/net_sntp.h>
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#endif /* CYGPKG_NET_SNTP */
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#if 0
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#define perror( txt ) // nothing
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#endif
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#include <network.h>
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#include <dhcp.h>
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#include <errno.h>
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#include <cyg/infra/cyg_ass.h>
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#ifdef INET6
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#include <net/if_var.h>
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#include <netinet6/in6_var.h>
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#endif
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extern int cyg_arc4random(void);
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#ifdef CYGOPT_NET_DHCP_OPTION_HOST_NAME
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static char dhcp_hostname[CYGNUM_NET_DHCP_OPTION_HOST_NAME_LEN+1];
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// Set the hostname used by the DHCP TAG_HOST_NAME option. We
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// copy the callers name into a private buffer, since we don't
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// know the context in which the callers hostname was allocated.
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void dhcp_set_hostname(char *hostname)
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{
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CYG_ASSERT( (strlen(hostname)<=CYGNUM_NET_DHCP_OPTION_HOST_NAME_LEN), "dhcp hostname too long" );
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strncpy(dhcp_hostname, hostname, CYGNUM_NET_DHCP_OPTION_HOST_NAME_LEN);
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}
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#endif
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/* Forward reference prototypes. */
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static int unset_tag( struct bootp *ppkt, unsigned char tag );
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// ------------------------------------------------------------------------
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// Returns a pointer to the end of dhcp message (or NULL if invalid)
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// meaning the address of the byte *after* the TAG_END token in the vendor
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// data.
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static unsigned char *
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scan_dhcp_size( struct bootp *ppkt )
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{
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unsigned char *op;
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op = &ppkt->bp_vend[0];
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// First check for the cookie!
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if ( op[0] != 99 ||
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op[1] != 130 ||
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op[2] != 83 ||
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op[3] != 99 ) {
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CYG_FAIL( "Bad DHCP cookie" );
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return NULL;
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}
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op += 4;
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// This will only scan the options field.
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while (*op != TAG_END) {
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if ( *op == TAG_PAD ) {
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op++;
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} else {
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op += *(op+1)+2;
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}
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if ( op > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
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CYG_FAIL( "Oversize DHCP packet in dhcp_size" );
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return NULL;
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}
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}
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// Check op has not gone wild
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CYG_ASSERT( op > (unsigned char *)(&ppkt[0]), "op pointer underflow!" );
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// Compare op with non-existent "next" struct bootp in the array.
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CYG_ASSERT( op < (unsigned char *)(&ppkt[1]), "op pointer overflow!" );
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return op + 1; // Address of first invalid byte
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}
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// ------------------------------------------------------------------------
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// Get the actual packet size of an initialized buffer
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static int
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dhcp_size( struct bootp *ppkt )
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{
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unsigned char *op;
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op = scan_dhcp_size( ppkt );
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if ( !op ) return 0;
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return (op - (unsigned char *)ppkt);
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}
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// ------------------------------------------------------------------------
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// Get the actual packet size of an initialized buffer
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// This will also pad the packet with 0 if length is less
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// than BP_STD_TX_MINPKTSZ.
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static int
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dhcp_size_for_send( struct bootp *ppkt )
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{
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unsigned char *op;
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op = scan_dhcp_size( ppkt );
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if ( !op ) return 0; // Better not scribble!
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// Zero extra bytes until the packet is large enough.
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for ( ; op < (((unsigned char *)ppkt) + BP_STD_TX_MINPKTSZ); op++ )
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*op = 0;
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return (op - (unsigned char *)ppkt);
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}
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// ------------------------------------------------------------------------
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// Insert/set an option value in an initialized buffer
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static int
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set_fixed_tag( struct bootp *ppkt,
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unsigned char tag,
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cyg_uint32 value,
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int len)
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{
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unsigned char *op;
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// Initially this will only scan the options field.
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op = &ppkt->bp_vend[4];
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while (*op != TAG_END) {
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if ( op > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
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CYG_FAIL( "Oversize DHCP packet in set_fixed_tag" );
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return false;
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}
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if (*op == tag) // Found it...
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break;
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if ( *op == TAG_PAD ) {
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op++;
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} else {
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op += *(op+1)+2;
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}
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}
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if (*op == tag) { // Found it...
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/* There are three possibilities:
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* 1) *(op+1) == len
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* 2) *(op+1) > len
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* 3) *(op+1) < len
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* For 1, just overwrite the existing option data.
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* For 2, overwrite the existing option data and pullup the
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* remaining option data (if any).
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* For 3, pullup any remaining option data to remove the option
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* and then add the option to the end.
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* For simplicity, for case 2 and 3, we just call unset_tag()
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* and re-add the option to the end.
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*/
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207 |
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if ( *(op+1) != len ) {
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/* Remove existing option entry. */
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unset_tag(ppkt, tag);
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/* Adjust the op pointer to re-add at the end. */
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op = scan_dhcp_size(ppkt);
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CYG_ASSERT(op!=NULL, "Invalid options size in set_fixed_tag" );
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op--;
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CYG_ASSERT(*op==TAG_END, "Missing TAG_END in set_fixed_tag");
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if ( op + len + 2 > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
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CYG_FAIL( "Oversize DHCP packet in set_fixed_tag replace" );
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return false;
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218 |
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}
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*op = tag;
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*(op+1) = len;
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*(op + len + 2) = TAG_END;
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}
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223 |
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}
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else { // overwrite the end tag and install a new one
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225 |
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if ( op + len + 2 > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
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CYG_FAIL( "Oversize DHCP packet in set_fixed_tag append" );
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return false;
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}
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*op = tag;
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*(op+1) = len;
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*(op + len + 2) = TAG_END;
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}
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// and insert the value. Net order is BE.
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op += len + 2 - 1; // point to end of value
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while ( len-- > 0 ) {
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*op-- = (unsigned char)(value & 255);
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value >>= 8;
|
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}
|
239 |
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return true;
|
240 |
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}
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241 |
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242 |
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static int
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set_variable_tag( struct bootp *ppkt,
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unsigned char tag,
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cyg_uint8 *pvalue,
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246 |
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int len)
|
247 |
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{
|
248 |
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unsigned char *op;
|
249 |
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|
250 |
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// Initially this will only scan the options field.
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251 |
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op = &ppkt->bp_vend[4];
|
252 |
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while (*op != TAG_END) {
|
253 |
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if ( op > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
|
254 |
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CYG_FAIL( "Oversize DHCP packet in set_variable_tag" );
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255 |
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return false;
|
256 |
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}
|
257 |
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if (*op == tag) // Found it...
|
258 |
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break;
|
259 |
|
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if ( *op == TAG_PAD ) {
|
260 |
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op++;
|
261 |
|
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} else {
|
262 |
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op += *(op+1)+2;
|
263 |
|
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}
|
264 |
|
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}
|
265 |
|
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|
266 |
|
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if (*op == tag) { // Found it...
|
267 |
|
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/* There are three possibilities:
|
268 |
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* 1) *(op+1) == len
|
269 |
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* 2) *(op+1) > len
|
270 |
|
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* 3) *(op+1) < len
|
271 |
|
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* For 1, just overwrite the existing option data.
|
272 |
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* For 2, overwrite the existing option data and pullup the
|
273 |
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* remaining option data (if any).
|
274 |
|
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* For 3, pullup any remaining option data to remove the option
|
275 |
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* and then add the option to the end.
|
276 |
|
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* For simplicity, for case 2 and 3, we just call unset_tag()
|
277 |
|
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* and re-add the option to the end.
|
278 |
|
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*/
|
279 |
|
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if ( *(op+1) != len ) {
|
280 |
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/* Remove existing option entry. */
|
281 |
|
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unset_tag(ppkt, tag);
|
282 |
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/* Adjust the op pointer to re-add at the end. */
|
283 |
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op = scan_dhcp_size(ppkt);
|
284 |
|
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CYG_ASSERT(op!=NULL, "Invalid options size in set_variable_tag" );
|
285 |
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op--;
|
286 |
|
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CYG_ASSERT(*op==TAG_END, "Missing TAG_END in set_variable_tag");
|
287 |
|
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if ( op + len + 2 > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
|
288 |
|
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CYG_FAIL( "Oversize DHCP packet in set_variable_tag replace" );
|
289 |
|
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return false;
|
290 |
|
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}
|
291 |
|
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*op = tag;
|
292 |
|
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*(op+1) = len;
|
293 |
|
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*(op + len + 2) = TAG_END;
|
294 |
|
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}
|
295 |
|
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}
|
296 |
|
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else { // overwrite the end tag and install a new one
|
297 |
|
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if ( op + len + 2 > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
|
298 |
|
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CYG_FAIL( "Oversize DHCP packet in set_variable_tag append" );
|
299 |
|
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return false;
|
300 |
|
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}
|
301 |
|
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*op = tag;
|
302 |
|
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*(op+1) = len;
|
303 |
|
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*(op + len + 2) = TAG_END;
|
304 |
|
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}
|
305 |
|
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// and insert the value. No order is implied.
|
306 |
|
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op += 2; // point to start of value
|
307 |
|
|
while ( len-- > 0 ) {
|
308 |
|
|
*op++ = *pvalue++;
|
309 |
|
|
}
|
310 |
|
|
return true;
|
311 |
|
|
}
|
312 |
|
|
|
313 |
|
|
static int
|
314 |
|
|
unset_tag( struct bootp *ppkt,
|
315 |
|
|
unsigned char tag )
|
316 |
|
|
{
|
317 |
|
|
unsigned char *op, *nextp = 0, *killp = 0;
|
318 |
|
|
|
319 |
|
|
// Initially this will only scan the options field.
|
320 |
|
|
|
321 |
|
|
op = &ppkt->bp_vend[4];
|
322 |
|
|
while (*op != TAG_END) {
|
323 |
|
|
if ( op > &ppkt->bp_vend[BP_VEND_LEN-1] ) {
|
324 |
|
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CYG_FAIL( "Oversize DHCP packet in unset_tag" );
|
325 |
|
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return false;
|
326 |
|
|
}
|
327 |
|
|
if (*op == tag) { // Found it...
|
328 |
|
|
killp = op; // item to kill
|
329 |
|
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nextp = op + *(op+1)+2; // next item address
|
330 |
|
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}
|
331 |
|
|
if ( *op == TAG_PAD ) {
|
332 |
|
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op++;
|
333 |
|
|
} else {
|
334 |
|
|
op += *(op+1)+2;
|
335 |
|
|
}
|
336 |
|
|
}
|
337 |
|
|
|
338 |
|
|
if ( !killp )
|
339 |
|
|
return false;
|
340 |
|
|
|
341 |
|
|
// Obliterate the found op by copying down: *op is the end.
|
342 |
|
|
while( nextp <= op ) // <= to copy the TAG_END too.
|
343 |
|
|
*killp++ = *nextp++;
|
344 |
|
|
|
345 |
|
|
return true;
|
346 |
|
|
}
|
347 |
|
|
|
348 |
|
|
// ------------------------------------------------------------------------
|
349 |
|
|
// Bring up an interface enough to broadcast, before we know who we are
|
350 |
|
|
|
351 |
|
|
static int
|
352 |
|
|
bring_half_up(const char *intf, struct ifreq *ifrp )
|
353 |
|
|
{
|
354 |
|
|
int s = -1;
|
355 |
|
|
int one = 1;
|
356 |
|
|
|
357 |
|
|
struct sockaddr_in *addrp;
|
358 |
|
|
struct ecos_rtentry route;
|
359 |
|
|
int retcode = false;
|
360 |
|
|
|
361 |
|
|
// Ensure clean slate
|
362 |
|
|
cyg_route_reinit(); // Force any existing routes to be forgotten
|
363 |
|
|
|
364 |
|
|
s = socket(AF_INET, SOCK_DGRAM, 0);
|
365 |
|
|
if (s < 0) {
|
366 |
|
|
perror("socket");
|
367 |
|
|
goto out;
|
368 |
|
|
}
|
369 |
|
|
|
370 |
|
|
if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one))) {
|
371 |
|
|
perror("setsockopt");
|
372 |
|
|
goto out;
|
373 |
|
|
}
|
374 |
|
|
|
375 |
|
|
addrp = (struct sockaddr_in *) &ifrp->ifr_addr;
|
376 |
|
|
memset(addrp, 0, sizeof(*addrp));
|
377 |
|
|
addrp->sin_family = AF_INET;
|
378 |
|
|
addrp->sin_len = sizeof(*addrp);
|
379 |
|
|
addrp->sin_port = 0;
|
380 |
|
|
addrp->sin_addr.s_addr = INADDR_ANY;
|
381 |
|
|
|
382 |
|
|
strcpy(ifrp->ifr_name, intf);
|
383 |
|
|
if (ioctl(s, SIOCSIFADDR, ifrp)) { /* set ifnet address */
|
384 |
|
|
perror("SIOCSIFADDR");
|
385 |
|
|
goto out;
|
386 |
|
|
}
|
387 |
|
|
|
388 |
|
|
if (ioctl(s, SIOCSIFNETMASK, ifrp)) { /* set net addr mask */
|
389 |
|
|
perror("SIOCSIFNETMASK");
|
390 |
|
|
goto out;
|
391 |
|
|
}
|
392 |
|
|
|
393 |
|
|
/* the broadcast address is 255.255.255.255 */
|
394 |
|
|
memset(&addrp->sin_addr, 255, sizeof(addrp->sin_addr));
|
395 |
|
|
if (ioctl(s, SIOCSIFBRDADDR, ifrp)) { /* set broadcast addr */
|
396 |
|
|
perror("SIOCSIFBRDADDR");
|
397 |
|
|
goto out;
|
398 |
|
|
}
|
399 |
|
|
|
400 |
|
|
ifrp->ifr_flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING;
|
401 |
|
|
if (ioctl(s, SIOCSIFFLAGS, ifrp)) { /* set ifnet flags */
|
402 |
|
|
perror("SIOCSIFFLAGS up");
|
403 |
|
|
goto out;
|
404 |
|
|
}
|
405 |
|
|
|
406 |
|
|
if (ioctl(s, SIOCGIFHWADDR, ifrp) < 0) { /* get MAC address */
|
407 |
|
|
perror("SIOCGIFHWADDR 1");
|
408 |
|
|
goto out;
|
409 |
|
|
}
|
410 |
|
|
|
411 |
|
|
// Set up routing
|
412 |
|
|
addrp->sin_family = AF_INET;
|
413 |
|
|
addrp->sin_port = 0;
|
414 |
|
|
addrp->sin_len = sizeof(*addrp); // Size of address
|
415 |
|
|
|
416 |
|
|
/* the broadcast address is 255.255.255.255 */
|
417 |
|
|
memset(&addrp->sin_addr, 255, sizeof(addrp->sin_addr));
|
418 |
|
|
memset(&route, 0, sizeof(route));
|
419 |
|
|
memcpy(&route.rt_gateway, addrp, sizeof(*addrp));
|
420 |
|
|
|
421 |
|
|
addrp->sin_addr.s_addr = INADDR_ANY;
|
422 |
|
|
memcpy(&route.rt_dst, addrp, sizeof(*addrp));
|
423 |
|
|
memcpy(&route.rt_genmask, addrp, sizeof(*addrp));
|
424 |
|
|
|
425 |
|
|
route.rt_dev = ifrp->ifr_name;
|
426 |
|
|
route.rt_flags = RTF_UP|RTF_GATEWAY;
|
427 |
|
|
route.rt_metric = 0;
|
428 |
|
|
|
429 |
|
|
if (ioctl(s, SIOCADDRT, &route)) { /* add route */
|
430 |
|
|
if (errno != EEXIST) {
|
431 |
|
|
perror("SIOCADDRT 3");
|
432 |
|
|
goto out;
|
433 |
|
|
}
|
434 |
|
|
}
|
435 |
|
|
retcode = true;
|
436 |
|
|
out:
|
437 |
|
|
if (s != -1)
|
438 |
|
|
close(s);
|
439 |
|
|
|
440 |
|
|
return retcode;
|
441 |
|
|
}
|
442 |
|
|
|
443 |
|
|
|
444 |
|
|
// ------------------------------------------------------------------------
|
445 |
|
|
// DHCP retransmission timeouts and number of tries
|
446 |
|
|
//
|
447 |
|
|
// To work better with simulated failures (or real ones!) so that the rest
|
448 |
|
|
// of the system is tested, rather than DHCP renewal failures pulling
|
449 |
|
|
// everything down, we try a little more zealously than the RFC suggests.
|
450 |
|
|
|
451 |
|
|
static unsigned char timeout_random = 0;
|
452 |
|
|
|
453 |
|
|
struct timeout_state {
|
454 |
|
|
unsigned int secs;
|
455 |
|
|
int countdown;
|
456 |
|
|
};
|
457 |
|
|
|
458 |
|
|
static inline void reset_timeout( struct timeval *ptv, struct timeout_state *pstate )
|
459 |
|
|
{
|
460 |
|
|
timeout_random++;
|
461 |
|
|
pstate->countdown = 4; // initial fast retries
|
462 |
|
|
pstate->secs = 3 + (timeout_random & 3);
|
463 |
|
|
ptv->tv_sec = 0;
|
464 |
|
|
ptv->tv_usec = 65536 * (2 + (timeout_random & 3)); // 0.1 - 0.3S, about
|
465 |
|
|
}
|
466 |
|
|
|
467 |
|
|
static inline int next_timeout( struct timeval *ptv, struct timeout_state *pstate )
|
468 |
|
|
{
|
469 |
|
|
if ( 0 < pstate->countdown-- )
|
470 |
|
|
return true;
|
471 |
|
|
if ( 0 == ptv->tv_sec )
|
472 |
|
|
ptv->tv_sec = pstate->secs;
|
473 |
|
|
else {
|
474 |
|
|
timeout_random++;
|
475 |
|
|
pstate->secs = ptv->tv_sec * 2 - 2 + (timeout_random & 3);
|
476 |
|
|
pstate->countdown = 2; // later fast retries
|
477 |
|
|
ptv->tv_sec = 0;
|
478 |
|
|
}
|
479 |
|
|
// If longer, too many tries...
|
480 |
|
|
return pstate->secs < CYGNUM_NET_DHCP_MIN_RETRY_TIME;
|
481 |
|
|
}
|
482 |
|
|
|
483 |
|
|
// ------------------------------------------------------------------------
|
484 |
|
|
// Lease expiry and alarms to notify it
|
485 |
|
|
|
486 |
|
|
static cyg_alarm_t alarm_function;
|
487 |
|
|
|
488 |
|
|
static void alarm_function(cyg_handle_t alarm, cyg_addrword_t data)
|
489 |
|
|
{
|
490 |
|
|
struct dhcp_lease *lease = (struct dhcp_lease *)data;
|
491 |
|
|
lease->which |= lease->next;
|
492 |
|
|
if ( lease->needs_attention )
|
493 |
|
|
cyg_semaphore_post( lease->needs_attention );
|
494 |
|
|
|
495 |
|
|
// Step the lease on into its next state of being alarmed ;-)
|
496 |
|
|
if ( lease->next & DHCP_LEASE_EX ) {
|
497 |
|
|
cyg_alarm_disable( alarm );
|
498 |
|
|
}
|
499 |
|
|
else if ( lease->next & DHCP_LEASE_T2 ) {
|
500 |
|
|
lease->next = DHCP_LEASE_EX;
|
501 |
|
|
cyg_alarm_initialize( lease->alarm, lease->expiry, 0 );
|
502 |
|
|
cyg_alarm_enable( lease->alarm );
|
503 |
|
|
}
|
504 |
|
|
else if ( lease->next & DHCP_LEASE_T1 ) {
|
505 |
|
|
lease->next = DHCP_LEASE_T2;
|
506 |
|
|
cyg_alarm_initialize( lease->alarm, lease->t2, 0 );
|
507 |
|
|
cyg_alarm_enable( lease->alarm );
|
508 |
|
|
}
|
509 |
|
|
}
|
510 |
|
|
|
511 |
|
|
static inline void no_lease( struct dhcp_lease *lease )
|
512 |
|
|
{
|
513 |
|
|
if ( lease->alarm ) {
|
514 |
|
|
// Already set: delete this.
|
515 |
|
|
cyg_alarm_disable( lease->alarm );
|
516 |
|
|
cyg_alarm_delete( lease->alarm );
|
517 |
|
|
lease->alarm = 0;
|
518 |
|
|
}
|
519 |
|
|
}
|
520 |
|
|
|
521 |
|
|
static inline void new_lease( struct bootp *bootp, struct dhcp_lease *lease )
|
522 |
|
|
{
|
523 |
|
|
cyg_tick_count_t now = cyg_current_time();
|
524 |
|
|
cyg_tick_count_t then;
|
525 |
|
|
cyg_uint32 tag = 0;
|
526 |
|
|
cyg_uint32 expiry_then;
|
527 |
|
|
cyg_resolution_t resolution =
|
528 |
|
|
cyg_clock_get_resolution(cyg_real_time_clock());
|
529 |
|
|
cyg_handle_t h;
|
530 |
|
|
unsigned int length;
|
531 |
|
|
|
532 |
|
|
// Silence any jabbering from past lease on this interface
|
533 |
|
|
no_lease( lease );
|
534 |
|
|
lease->which = lease->next = 0;
|
535 |
|
|
cyg_clock_to_counter(cyg_real_time_clock(), &h);
|
536 |
|
|
cyg_alarm_create( h, alarm_function, (cyg_addrword_t)lease,
|
537 |
|
|
&lease->alarm, &lease->alarm_obj );
|
538 |
|
|
|
539 |
|
|
// extract the lease time and scale it &c to now.
|
540 |
|
|
length = sizeof(tag);
|
541 |
|
|
if(!get_bootp_option( bootp, TAG_DHCP_LEASE_TIME, &tag ,&length))
|
542 |
|
|
tag = 0xffffffff;
|
543 |
|
|
|
544 |
|
|
if ( 0xffffffff == tag ) {
|
545 |
|
|
lease->expiry = 0xffffffff;
|
546 |
|
|
lease->t2 = 0xffffffff;
|
547 |
|
|
lease->t1 = 0xffffffff;
|
548 |
|
|
return; // it's an infinite lease, hurrah!
|
549 |
|
|
}
|
550 |
|
|
|
551 |
|
|
then = (cyg_uint64)(ntohl(tag));
|
552 |
|
|
expiry_then = then;
|
553 |
|
|
|
554 |
|
|
then *= 1000000000; // into nS - we know there is room in a tick_count_t
|
555 |
|
|
then = (then / resolution.dividend) * resolution.divisor; // into system ticks
|
556 |
|
|
lease->expiry = now + then;
|
557 |
|
|
length = sizeof(tag);
|
558 |
|
|
if (get_bootp_option( bootp, TAG_DHCP_REBIND_TIME, &tag, &length ))
|
559 |
|
|
then = (cyg_uint64)(ntohl(tag));
|
560 |
|
|
else
|
561 |
|
|
then = expiry_then - expiry_then/4;
|
562 |
|
|
then *= 1000000000; // into nS - we know there is room in a tick_count_t
|
563 |
|
|
then = (then / resolution.dividend) * resolution.divisor; // into system ticks
|
564 |
|
|
lease->t2 = now + then;
|
565 |
|
|
|
566 |
|
|
length = sizeof(tag);
|
567 |
|
|
if (get_bootp_option( bootp, TAG_DHCP_RENEWAL_TIME, &tag, &length ))
|
568 |
|
|
then = (cyg_uint64)(ntohl(tag));
|
569 |
|
|
else
|
570 |
|
|
then = expiry_then/2;
|
571 |
|
|
then *= 1000000000; // into nS - we know there is room in a tick_count_t
|
572 |
|
|
then = (then / resolution.dividend) * resolution.divisor; // into system ticks
|
573 |
|
|
lease->t1 = now + then;
|
574 |
|
|
|
575 |
|
|
#if 0 // for testing this mechanism
|
576 |
|
|
lease->expiry = now + 5000; // 1000 here makes for failure in the DHCP test
|
577 |
|
|
lease->t2 = now + 3500;
|
578 |
|
|
lease->t1 = now + 2500;
|
579 |
|
|
#endif
|
580 |
|
|
|
581 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
582 |
|
|
diag_printf("new_lease:\n");
|
583 |
|
|
diag_printf(" expiry = %d\n",lease->expiry);
|
584 |
|
|
diag_printf(" t1 = %d\n",lease->t1);
|
585 |
|
|
diag_printf(" t2 = %d\n",lease->t2);
|
586 |
|
|
#endif
|
587 |
|
|
|
588 |
|
|
lease->next = DHCP_LEASE_T1;
|
589 |
|
|
|
590 |
|
|
cyg_alarm_initialize( lease->alarm, lease->t1, 0 );
|
591 |
|
|
cyg_alarm_enable( lease->alarm );
|
592 |
|
|
}
|
593 |
|
|
|
594 |
|
|
// ------------------------------------------------------------------------
|
595 |
|
|
// Set all the tags we want to use when sending a packet.
|
596 |
|
|
// This has expanded to a large, explicit set to interwork better
|
597 |
|
|
// with a variety of DHCP servers.
|
598 |
|
|
|
599 |
|
|
static void set_default_dhcp_tags( struct bootp *xmit )
|
600 |
|
|
{
|
601 |
|
|
// Explicitly request full set of params that are default for LINUX
|
602 |
|
|
// dhcp servers, but not default for others. This is rather arbitrary,
|
603 |
|
|
// but it preserves behaviour for people using those servers.
|
604 |
|
|
// Perhaps configury of this set will be needed in future?
|
605 |
|
|
//
|
606 |
|
|
// Here's the set:
|
607 |
|
|
static cyg_uint8 req_list[] = {
|
608 |
|
|
#ifdef CYGOPT_NET_DHCP_PARM_REQ_LIST_REPLACE
|
609 |
|
|
CYGOPT_NET_DHCP_PARM_REQ_LIST_REPLACE ,
|
610 |
|
|
#else
|
611 |
|
|
TAG_DHCP_SERVER_ID , // DHCP server id: 10.16.19.66
|
612 |
|
|
TAG_DHCP_LEASE_TIME , // DHCP time 51: 60
|
613 |
|
|
TAG_DHCP_RENEWAL_TIME , // DHCP time 58: 30
|
614 |
|
|
TAG_DHCP_REBIND_TIME , // DHCP time 59: 52
|
615 |
|
|
TAG_SUBNET_MASK , // subnet mask: 255.255.255.0
|
616 |
|
|
TAG_GATEWAY , // gateway: 10.16.19.66
|
617 |
|
|
TAG_DOMAIN_SERVER , // domain server: 10.16.19.66
|
618 |
|
|
TAG_DOMAIN_NAME , // domain name: hmt10.cambridge.redhat.com
|
619 |
|
|
TAG_IP_BROADCAST , // IP broadcast: 10.16.19.255
|
620 |
|
|
#endif
|
621 |
|
|
#ifdef CYGNUM_NET_SNTP_UNICAST_MAXDHCP
|
622 |
|
|
TAG_NTP_SERVER , // NTP Server Addresses(es)
|
623 |
|
|
#endif
|
624 |
|
|
#ifdef CYGOPT_NET_DHCP_PARM_REQ_LIST_ADDITIONAL
|
625 |
|
|
CYGOPT_NET_DHCP_PARM_REQ_LIST_ADDITIONAL ,
|
626 |
|
|
#endif
|
627 |
|
|
};
|
628 |
|
|
|
629 |
|
|
if ( req_list[0] ) // So that one may easily turn it all off by configury
|
630 |
|
|
set_variable_tag( xmit, TAG_DHCP_PARM_REQ_LIST,
|
631 |
|
|
&req_list[0], sizeof( req_list ) );
|
632 |
|
|
|
633 |
|
|
#ifdef CYGOPT_NET_DHCP_OPTION_HOST_NAME
|
634 |
|
|
{
|
635 |
|
|
int nlen = strlen(dhcp_hostname);
|
636 |
|
|
|
637 |
|
|
if (nlen > 0)
|
638 |
|
|
set_variable_tag( xmit, TAG_HOST_NAME, dhcp_hostname, nlen + 1);
|
639 |
|
|
}
|
640 |
|
|
#endif
|
641 |
|
|
#ifdef CYGOPT_NET_DHCP_OPTION_DHCP_CLIENTID_MAC
|
642 |
|
|
{
|
643 |
|
|
cyg_uint8 id[16+1]; /* sizeof bp_chaddr[] + 1 */
|
644 |
|
|
|
645 |
|
|
id[0] = 1; /* 1-byte hardware type: 1=ethernet. */
|
646 |
|
|
CYG_ASSERT( xmit->bp_hlen<=(sizeof(id)-1), "HW address invalid" );
|
647 |
|
|
memcpy(&id[1], &xmit->bp_chaddr, xmit->bp_hlen);
|
648 |
|
|
set_variable_tag( xmit, TAG_DHCP_CLIENTID, id, xmit->bp_hlen+1);
|
649 |
|
|
}
|
650 |
|
|
#endif
|
651 |
|
|
|
652 |
|
|
// Explicitly specify our max message size.
|
653 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MAX_MSGSZ, BP_MINPKTSZ, 2 );
|
654 |
|
|
}
|
655 |
|
|
|
656 |
|
|
// ------------------------------------------------------------------------
|
657 |
|
|
// Get BOOTP/DHCP response.
|
658 |
|
|
// Wait up to the amount of time specified by *tvp.
|
659 |
|
|
|
660 |
|
|
static int
|
661 |
|
|
get_response(int s, struct bootp *response, struct sockaddr_in *from, struct timeval *tvp)
|
662 |
|
|
{
|
663 |
|
|
int pktlen;
|
664 |
|
|
socklen_t addrlen;
|
665 |
|
|
|
666 |
|
|
setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, tvp, sizeof(*tvp));
|
667 |
|
|
|
668 |
|
|
addrlen = sizeof(*from);
|
669 |
|
|
pktlen = recvfrom(s, response, sizeof(*response), 0, (struct sockaddr *)from, &addrlen);
|
670 |
|
|
/* Some DHCP servers don't terminate the options list with
|
671 |
|
|
* an END tag. Append one if we can.
|
672 |
|
|
*/
|
673 |
|
|
if ((pktlen >= 0) && (pktlen < sizeof(*response)))
|
674 |
|
|
{
|
675 |
|
|
/* Do not count the added END tag in the returned packet length.
|
676 |
|
|
* The returned packet length is the number of bytes received
|
677 |
|
|
* from the DHCP server. The added END tag is only used
|
678 |
|
|
* internally for packet parsing purposes.
|
679 |
|
|
*/
|
680 |
|
|
((unsigned char *)response)[pktlen] = TAG_END;
|
681 |
|
|
}
|
682 |
|
|
return pktlen;
|
683 |
|
|
}
|
684 |
|
|
|
685 |
|
|
// ------------------------------------------------------------------------
|
686 |
|
|
// the DHCP state machine - this does all the work
|
687 |
|
|
|
688 |
|
|
int
|
689 |
|
|
do_dhcp(const char *intf, struct bootp *res,
|
690 |
|
|
cyg_uint8 *pstate, struct dhcp_lease *lease)
|
691 |
|
|
{
|
692 |
|
|
struct ifreq ifr;
|
693 |
|
|
struct sockaddr_in cli_addr, broadcast_addr, server_addr, rx_addr;
|
694 |
|
|
int s = -1;
|
695 |
|
|
int one = 1;
|
696 |
|
|
unsigned char mincookie[] = {99,130,83,99,255} ;
|
697 |
|
|
struct timeval tv;
|
698 |
|
|
struct timeout_state timeout_scratch;
|
699 |
|
|
cyg_uint8 oldstate = *pstate;
|
700 |
|
|
cyg_uint8 msgtype = 0, seen_bootp_reply = 0;
|
701 |
|
|
unsigned int length;
|
702 |
|
|
|
703 |
|
|
cyg_uint32 xid;
|
704 |
|
|
unsigned short bp_secs;
|
705 |
|
|
|
706 |
|
|
#define CHECK_XID() ( /* and other details */ \
|
707 |
|
|
received->bp_xid != xid || /* not the same transaction */ \
|
708 |
|
|
received->bp_htype != xmit->bp_htype || /* not the same ESA type */ \
|
709 |
|
|
received->bp_hlen != xmit->bp_hlen || /* not the same length */ \
|
710 |
|
|
bcmp( &received->bp_chaddr, &xmit->bp_chaddr, xmit->bp_hlen ) \
|
711 |
|
|
)
|
712 |
|
|
|
713 |
|
|
// IMPORTANT: xmit is the same as res throughout this; *received is a
|
714 |
|
|
// scratch buffer for reception; its contents are always copied to res
|
715 |
|
|
// when we are happy with them. So we always transmit from the
|
716 |
|
|
// existing state.
|
717 |
|
|
struct bootp rx_local;
|
718 |
|
|
struct bootp *received = &rx_local;
|
719 |
|
|
struct bootp *xmit = res;
|
720 |
|
|
struct bootp xmit2;
|
721 |
|
|
int xlen;
|
722 |
|
|
|
723 |
|
|
// First, get a socket on the interface in question. But Zeroth, if
|
724 |
|
|
// needs be, bring it to the half-up broadcast only state if needs be.
|
725 |
|
|
|
726 |
|
|
if ( DHCPSTATE_INIT == oldstate
|
727 |
|
|
|| DHCPSTATE_FAILED == oldstate
|
728 |
|
|
|| 0 == oldstate ) {
|
729 |
|
|
// either explicit init state or the beginning of time or retry
|
730 |
|
|
if ( ! bring_half_up( intf, &ifr ) )
|
731 |
|
|
return false;
|
732 |
|
|
|
733 |
|
|
*pstate = DHCPSTATE_INIT;
|
734 |
|
|
lease->which = lease->next = 0;
|
735 |
|
|
}
|
736 |
|
|
|
737 |
|
|
s = socket(AF_INET, SOCK_DGRAM, 0);
|
738 |
|
|
if (s < 0) {
|
739 |
|
|
perror("socket");
|
740 |
|
|
goto out;
|
741 |
|
|
}
|
742 |
|
|
|
743 |
|
|
if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one))) {
|
744 |
|
|
perror("setsockopt");
|
745 |
|
|
goto out;
|
746 |
|
|
}
|
747 |
|
|
|
748 |
|
|
memset((char *) &cli_addr, 0, sizeof(cli_addr));
|
749 |
|
|
cli_addr.sin_family = AF_INET;
|
750 |
|
|
cli_addr.sin_len = sizeof(cli_addr);
|
751 |
|
|
cli_addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
752 |
|
|
cli_addr.sin_port = htons(IPPORT_BOOTPC);
|
753 |
|
|
|
754 |
|
|
memset((char *) &broadcast_addr, 0, sizeof(broadcast_addr));
|
755 |
|
|
broadcast_addr.sin_family = AF_INET;
|
756 |
|
|
broadcast_addr.sin_len = sizeof(broadcast_addr);
|
757 |
|
|
broadcast_addr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
|
758 |
|
|
broadcast_addr.sin_port = htons(IPPORT_BOOTPS);
|
759 |
|
|
|
760 |
|
|
memset((char *) &server_addr, 0, sizeof(server_addr));
|
761 |
|
|
server_addr.sin_family = AF_INET;
|
762 |
|
|
server_addr.sin_len = sizeof(server_addr);
|
763 |
|
|
server_addr.sin_addr.s_addr = htonl(INADDR_BROADCAST); // overwrite later
|
764 |
|
|
server_addr.sin_port = htons(IPPORT_BOOTPS);
|
765 |
|
|
|
766 |
|
|
if(bind(s, (struct sockaddr *) &cli_addr, sizeof(cli_addr)) < 0) {
|
767 |
|
|
perror("bind error");
|
768 |
|
|
goto out;
|
769 |
|
|
}
|
770 |
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) {
|
771 |
|
|
perror("setsockopt SO_REUSEADDR");
|
772 |
|
|
goto out;
|
773 |
|
|
}
|
774 |
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one))) {
|
775 |
|
|
perror("setsockopt SO_REUSEPORT");
|
776 |
|
|
goto out;
|
777 |
|
|
}
|
778 |
|
|
|
779 |
|
|
// Now, we can launch into the DHCP state machine. I think this will
|
780 |
|
|
// be the neatest way to do it; it returns from within the switch arms
|
781 |
|
|
// when all is well, or utterly failed.
|
782 |
|
|
|
783 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
784 |
|
|
|
785 |
|
|
// Choose a new XID: first get the ESA as a basis:
|
786 |
|
|
strcpy(&ifr.ifr_name[0], intf);
|
787 |
|
|
if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0) {
|
788 |
|
|
perror("SIOCGIFHWADDR 2");
|
789 |
|
|
goto out;
|
790 |
|
|
}
|
791 |
|
|
|
792 |
|
|
// Choose from scratch depending on ifr_hwaddr...[]
|
793 |
|
|
xid = ifr.ifr_hwaddr.sa_data[5];
|
794 |
|
|
xid |= (ifr.ifr_hwaddr.sa_data[4]) << 8;
|
795 |
|
|
xid |= (ifr.ifr_hwaddr.sa_data[3]) << 16;
|
796 |
|
|
xid |= (ifr.ifr_hwaddr.sa_data[2]) << 24;
|
797 |
|
|
xid ^= (cyg_arc4random() & 0xffff0000);
|
798 |
|
|
|
799 |
|
|
// Avoid adjacent ESAs colliding by increment
|
800 |
|
|
#define NEW_XID(_xid) CYG_MACRO_START (_xid)+= 0x10000; CYG_MACRO_END
|
801 |
|
|
|
802 |
|
|
while ( 1 ) {
|
803 |
|
|
|
804 |
|
|
// If we are active rather than in the process of shutting down,
|
805 |
|
|
// check for any lease expiry every time round, so that alarms
|
806 |
|
|
// *can* change the course of events even when already renewing,
|
807 |
|
|
// for example.
|
808 |
|
|
if ( DHCPSTATE_DO_RELEASE != *pstate
|
809 |
|
|
&& DHCPSTATE_NOTBOUND != *pstate
|
810 |
|
|
&& DHCPSTATE_FAILED != *pstate ) {
|
811 |
|
|
cyg_uint8 lease_state;
|
812 |
|
|
|
813 |
|
|
cyg_scheduler_lock();
|
814 |
|
|
lease_state = lease->which;
|
815 |
|
|
lease->which = 0; // flag that we have noticed it
|
816 |
|
|
cyg_scheduler_unlock();
|
817 |
|
|
|
818 |
|
|
if ( lease_state & DHCP_LEASE_EX ) {
|
819 |
|
|
// then the lease has expired completely!
|
820 |
|
|
*pstate = DHCPSTATE_NOTBOUND;
|
821 |
|
|
}
|
822 |
|
|
else if ( lease_state & DHCP_LEASE_T2 ) {
|
823 |
|
|
// Time to renew
|
824 |
|
|
reset_timeout( &tv, &timeout_scratch ); // next conversation
|
825 |
|
|
*pstate = DHCPSTATE_REBINDING;
|
826 |
|
|
}
|
827 |
|
|
else if ( lease_state & DHCP_LEASE_T1 ) {
|
828 |
|
|
// Time to renew
|
829 |
|
|
reset_timeout( &tv, &timeout_scratch ); // next conversation
|
830 |
|
|
*pstate = DHCPSTATE_RENEWING;
|
831 |
|
|
}
|
832 |
|
|
}
|
833 |
|
|
|
834 |
|
|
switch ( *pstate ) {
|
835 |
|
|
|
836 |
|
|
case DHCPSTATE_INIT:
|
837 |
|
|
|
838 |
|
|
// Send the DHCPDISCOVER packet
|
839 |
|
|
|
840 |
|
|
// Fill in the BOOTP request - DHCPDISCOVER packet
|
841 |
|
|
bzero(xmit, sizeof(*xmit));
|
842 |
|
|
xmit->bp_op = BOOTREQUEST;
|
843 |
|
|
xmit->bp_htype = HTYPE_ETHERNET;
|
844 |
|
|
xmit->bp_hlen = IFHWADDRLEN;
|
845 |
|
|
xmit->bp_xid = xid;
|
846 |
|
|
bp_secs = cyg_current_time() / 100;
|
847 |
|
|
xmit->bp_secs = htons(bp_secs);
|
848 |
|
|
xmit->bp_flags = htons(0x8000); // BROADCAST FLAG
|
849 |
|
|
bcopy(ifr.ifr_hwaddr.sa_data, &xmit->bp_chaddr, xmit->bp_hlen);
|
850 |
|
|
bcopy(mincookie, xmit->bp_vend, sizeof(mincookie));
|
851 |
|
|
|
852 |
|
|
// remove the next line to test ability to handle bootp packets.
|
853 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MESS_TYPE, DHCPDISCOVER, 1 );
|
854 |
|
|
// Set all the tags we want to use when sending a packet
|
855 |
|
|
set_default_dhcp_tags( xmit );
|
856 |
|
|
|
857 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
858 |
|
|
diag_printf( "---------DHCPSTATE_INIT sending:\n" );
|
859 |
|
|
show_bootp( intf, xmit );
|
860 |
|
|
#endif
|
861 |
|
|
if(sendto(s, xmit, dhcp_size_for_send(xmit), 0,
|
862 |
|
|
(struct sockaddr *)&broadcast_addr, sizeof(broadcast_addr)) < 0) {
|
863 |
|
|
*pstate = DHCPSTATE_FAILED;
|
864 |
|
|
break;
|
865 |
|
|
}
|
866 |
|
|
|
867 |
|
|
seen_bootp_reply = 0;
|
868 |
|
|
*pstate = DHCPSTATE_SELECTING;
|
869 |
|
|
break;
|
870 |
|
|
|
871 |
|
|
case DHCPSTATE_SELECTING:
|
872 |
|
|
// This is a separate state so that we can listen again
|
873 |
|
|
// *without* retransmitting.
|
874 |
|
|
|
875 |
|
|
// listen for the DHCPOFFER reply
|
876 |
|
|
|
877 |
|
|
if (get_response(s, received, &rx_addr, &tv) < 0) {
|
878 |
|
|
// No packet arrived (this time)
|
879 |
|
|
if ( seen_bootp_reply ) { // then already have a bootp reply
|
880 |
|
|
// Save the good packet in *xmit
|
881 |
|
|
bcopy( received, xmit, dhcp_size(received) );
|
882 |
|
|
*pstate = DHCPSTATE_BOOTP_FALLBACK;
|
883 |
|
|
NEW_XID( xid ); // Happy to advance, so new XID
|
884 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
885 |
|
|
break;
|
886 |
|
|
}
|
887 |
|
|
// go to the next larger timeout and re-send:
|
888 |
|
|
if ( ! next_timeout( &tv, &timeout_scratch ) ) {
|
889 |
|
|
*pstate = DHCPSTATE_FAILED;
|
890 |
|
|
break;
|
891 |
|
|
}
|
892 |
|
|
*pstate = DHCPSTATE_INIT; // to retransmit
|
893 |
|
|
break;
|
894 |
|
|
}
|
895 |
|
|
// Check for well-formed packet with correct termination (not truncated)
|
896 |
|
|
length = dhcp_size( received );
|
897 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
898 |
|
|
diag_printf( "---------DHCPSTATE_SELECTING received:\n" );
|
899 |
|
|
if ( length <= 0 )
|
900 |
|
|
diag_printf( "WARNING! malformed or truncated packet\n" );
|
901 |
|
|
diag_printf( "...rx_addr is family %d, addr %08x, port %d\n",
|
902 |
|
|
rx_addr.sin_family,
|
903 |
|
|
rx_addr.sin_addr.s_addr,
|
904 |
|
|
rx_addr.sin_port );
|
905 |
|
|
show_bootp( intf, received );
|
906 |
|
|
#endif
|
907 |
|
|
if ( length <= 0 )
|
908 |
|
|
break;
|
909 |
|
|
if ( CHECK_XID() ) // XID and ESA matches?
|
910 |
|
|
break; // listen again...
|
911 |
|
|
|
912 |
|
|
if ( 0 == received->bp_siaddr.s_addr ) {
|
913 |
|
|
// then fill in from the options...
|
914 |
|
|
length = sizeof(received->bp_siaddr.s_addr);
|
915 |
|
|
get_bootp_option( received, TAG_DHCP_SERVER_ID,
|
916 |
|
|
&received->bp_siaddr.s_addr,
|
917 |
|
|
&length);
|
918 |
|
|
}
|
919 |
|
|
|
920 |
|
|
// see if it was a DHCP reply or a bootp reply; it could be
|
921 |
|
|
// either.
|
922 |
|
|
length = sizeof(msgtype);
|
923 |
|
|
if ( get_bootp_option( received, TAG_DHCP_MESS_TYPE, &msgtype,
|
924 |
|
|
&length) ) {
|
925 |
|
|
if ( DHCPOFFER == msgtype ) { // all is well
|
926 |
|
|
// Save the good packet in *xmit
|
927 |
|
|
bcopy( received, xmit, dhcp_size(received) );
|
928 |
|
|
// we like the packet, so reset the timeout for next time
|
929 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
930 |
|
|
*pstate = DHCPSTATE_REQUESTING;
|
931 |
|
|
NEW_XID( xid ); // Happy to advance, so new XID
|
932 |
|
|
}
|
933 |
|
|
}
|
934 |
|
|
else // No TAG_DHCP_MESS_TYPE entry so it's a bootp reply
|
935 |
|
|
seen_bootp_reply = 1; // (keep the bootp packet in received)
|
936 |
|
|
|
937 |
|
|
// If none of the above state changes occurred, we got a packet
|
938 |
|
|
// that "should not happen", OR we have a bootp reply in our
|
939 |
|
|
// hand; so listen again with the same timeout, without
|
940 |
|
|
// retrying the send, in the hope of getting a DHCP reply.
|
941 |
|
|
break;
|
942 |
|
|
|
943 |
|
|
case DHCPSTATE_REQUESTING:
|
944 |
|
|
// Just send what you got with a DHCPREQUEST in the message type.
|
945 |
|
|
// then wait for an ACK in DHCPSTATE_REQUEST_RECV.
|
946 |
|
|
|
947 |
|
|
// Fill in the BOOTP request - DHCPREQUEST packet
|
948 |
|
|
xmit->bp_xid = xid;
|
949 |
|
|
xmit->bp_op = BOOTREQUEST;
|
950 |
|
|
xmit->bp_flags = htons(0x8000); // BROADCAST FLAG
|
951 |
|
|
|
952 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MESS_TYPE, DHCPREQUEST, 1 );
|
953 |
|
|
// Set all the tags we want to use when sending a packet
|
954 |
|
|
set_default_dhcp_tags( xmit );
|
955 |
|
|
// And this will be a new one:
|
956 |
|
|
set_fixed_tag( xmit, TAG_DHCP_REQ_IP, ntohl(xmit->bp_yiaddr.s_addr), 4 );
|
957 |
|
|
|
958 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
959 |
|
|
diag_printf( "---------DHCPSTATE_REQUESTING sending:\n" );
|
960 |
|
|
show_bootp( intf, xmit );
|
961 |
|
|
#endif
|
962 |
|
|
// Send back a [modified] copy. Note that some fields are explicitly
|
963 |
|
|
// cleared, as per the RFC. We need the copy because these fields are
|
964 |
|
|
// still useful to us (and currently stored in the 'result' structure)
|
965 |
|
|
xlen = dhcp_size_for_send( xmit );
|
966 |
|
|
bcopy( xmit, &xmit2, xlen );
|
967 |
|
|
xmit2.bp_yiaddr.s_addr = xmit2.bp_siaddr.s_addr = xmit2.bp_giaddr.s_addr = 0;
|
968 |
|
|
xmit2.bp_hops = 0;
|
969 |
|
|
if(sendto(s, &xmit2, xlen, 0,
|
970 |
|
|
(struct sockaddr *)&broadcast_addr, sizeof(broadcast_addr)) < 0) {
|
971 |
|
|
*pstate = DHCPSTATE_FAILED;
|
972 |
|
|
break;
|
973 |
|
|
}
|
974 |
|
|
|
975 |
|
|
*pstate = DHCPSTATE_REQUEST_RECV;
|
976 |
|
|
break;
|
977 |
|
|
|
978 |
|
|
case DHCPSTATE_REQUEST_RECV:
|
979 |
|
|
// wait for an ACK or a NACK - retry by going back to
|
980 |
|
|
// DHCPSTATE_REQUESTING; NACK means go back to INIT.
|
981 |
|
|
|
982 |
|
|
if (get_response(s, received, &rx_addr, &tv) < 0) {
|
983 |
|
|
// No packet arrived
|
984 |
|
|
// go to the next larger timeout and re-send:
|
985 |
|
|
if ( ! next_timeout( &tv, &timeout_scratch ) ) {
|
986 |
|
|
*pstate = DHCPSTATE_FAILED;
|
987 |
|
|
break;
|
988 |
|
|
}
|
989 |
|
|
*pstate = DHCPSTATE_REQUESTING;
|
990 |
|
|
break;
|
991 |
|
|
}
|
992 |
|
|
// Check for well-formed packet with correct termination (not truncated)
|
993 |
|
|
length = dhcp_size( received );
|
994 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
995 |
|
|
diag_printf( "---------DHCPSTATE_REQUEST_RECV received:\n" );
|
996 |
|
|
if ( length <= 0 )
|
997 |
|
|
diag_printf( "WARNING! malformed or truncated packet\n" );
|
998 |
|
|
diag_printf( "...rx_addr is family %d, addr %08x, port %d\n",
|
999 |
|
|
rx_addr.sin_family,
|
1000 |
|
|
rx_addr.sin_addr.s_addr,
|
1001 |
|
|
rx_addr.sin_port );
|
1002 |
|
|
show_bootp( intf, received );
|
1003 |
|
|
#endif
|
1004 |
|
|
if ( length <= 0 )
|
1005 |
|
|
break;
|
1006 |
|
|
if ( CHECK_XID() ) // not the same transaction;
|
1007 |
|
|
break; // listen again...
|
1008 |
|
|
|
1009 |
|
|
if ( 0 == received->bp_siaddr.s_addr ) {
|
1010 |
|
|
// then fill in from the options...
|
1011 |
|
|
length = sizeof(received->bp_siaddr.s_addr );
|
1012 |
|
|
get_bootp_option( received, TAG_DHCP_SERVER_ID,
|
1013 |
|
|
&received->bp_siaddr.s_addr,
|
1014 |
|
|
&length);
|
1015 |
|
|
}
|
1016 |
|
|
|
1017 |
|
|
// check it was a DHCP reply
|
1018 |
|
|
length = sizeof(msgtype);
|
1019 |
|
|
if ( get_bootp_option( received, TAG_DHCP_MESS_TYPE, &msgtype,
|
1020 |
|
|
&length) ) {
|
1021 |
|
|
if ( DHCPACK == msgtype // Same offer & server?
|
1022 |
|
|
&& received->bp_yiaddr.s_addr == xmit->bp_yiaddr.s_addr
|
1023 |
|
|
&& received->bp_siaddr.s_addr == xmit->bp_siaddr.s_addr) {
|
1024 |
|
|
// we like the packet, so reset the timeout for next time
|
1025 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
1026 |
|
|
// Record the new lease and set up timers &c
|
1027 |
|
|
new_lease( received, lease );
|
1028 |
|
|
*pstate = DHCPSTATE_BOUND;
|
1029 |
|
|
break;
|
1030 |
|
|
}
|
1031 |
|
|
if ( DHCPNAK == msgtype // Same server?
|
1032 |
|
|
&& received->bp_siaddr.s_addr == xmit->bp_siaddr.s_addr) {
|
1033 |
|
|
// we're bounced!
|
1034 |
|
|
*pstate = DHCPSTATE_INIT; // So back the start of the rigmarole.
|
1035 |
|
|
NEW_XID( xid ); // Unhappy to advance, so new XID
|
1036 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
1037 |
|
|
break;
|
1038 |
|
|
}
|
1039 |
|
|
// otherwise it's something else, maybe another offer, or a bogus
|
1040 |
|
|
// NAK from someone we are not asking!
|
1041 |
|
|
// Just listen again, which implicitly discards it.
|
1042 |
|
|
}
|
1043 |
|
|
break;
|
1044 |
|
|
|
1045 |
|
|
case DHCPSTATE_BOUND:
|
1046 |
|
|
|
1047 |
|
|
// We are happy now, we have our address.
|
1048 |
|
|
|
1049 |
|
|
// All done with socket
|
1050 |
|
|
close(s);
|
1051 |
|
|
s = -1;
|
1052 |
|
|
|
1053 |
|
|
// Re-initialize the interface with the new state
|
1054 |
|
|
if ( DHCPSTATE_BOUND != oldstate ) {
|
1055 |
|
|
// Then need to go down and up
|
1056 |
|
|
do_dhcp_down_net( intf, res, &oldstate, lease ); // oldstate used
|
1057 |
|
|
if ( 0 != oldstate ) {
|
1058 |
|
|
// Then not called from init_all_network_interfaces()
|
1059 |
|
|
// so we must initialize the interface ourselves
|
1060 |
|
|
if (!init_net(intf, res)) {
|
1061 |
|
|
do_dhcp_down_net( intf, res, pstate, lease );
|
1062 |
|
|
*pstate = DHCPSTATE_FAILED;
|
1063 |
|
|
goto out;
|
1064 |
|
|
}
|
1065 |
|
|
}
|
1066 |
|
|
}
|
1067 |
|
|
|
1068 |
|
|
// Otherwise, nothing whatsoever to do...
|
1069 |
|
|
return true;
|
1070 |
|
|
|
1071 |
|
|
case DHCPSTATE_RENEWING:
|
1072 |
|
|
// Just send what you got with a DHCPREQUEST in the message
|
1073 |
|
|
// type UNICAST straight to the server. Then wait for an ACK.
|
1074 |
|
|
|
1075 |
|
|
// Fill in the BOOTP request - DHCPREQUEST packet
|
1076 |
|
|
xmit->bp_xid = xid;
|
1077 |
|
|
xmit->bp_op = BOOTREQUEST;
|
1078 |
|
|
xmit->bp_flags = htons(0); // No BROADCAST FLAG
|
1079 |
|
|
// Use the *client* address here:
|
1080 |
|
|
xmit->bp_ciaddr.s_addr = xmit->bp_yiaddr.s_addr;
|
1081 |
|
|
|
1082 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MESS_TYPE, DHCPREQUEST, 1 );
|
1083 |
|
|
// These must not be set in this context
|
1084 |
|
|
unset_tag( xmit, TAG_DHCP_REQ_IP );
|
1085 |
|
|
unset_tag( xmit, TAG_DHCP_SERVER_ID );
|
1086 |
|
|
// Set all the tags we want to use when sending a packet
|
1087 |
|
|
set_default_dhcp_tags( xmit );
|
1088 |
|
|
|
1089 |
|
|
// Set unicast address to *server*
|
1090 |
|
|
server_addr.sin_addr.s_addr = res->bp_siaddr.s_addr;
|
1091 |
|
|
|
1092 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
1093 |
|
|
diag_printf( "---------DHCPSTATE_RENEWING sending:\n" );
|
1094 |
|
|
diag_printf( "UNICAST to family %d, addr %08x, port %d\n",
|
1095 |
|
|
server_addr.sin_family,
|
1096 |
|
|
server_addr.sin_addr.s_addr,
|
1097 |
|
|
server_addr.sin_port );
|
1098 |
|
|
show_bootp( intf, xmit );
|
1099 |
|
|
#endif
|
1100 |
|
|
|
1101 |
|
|
// Send back a [modified] copy. Note that some fields are explicitly
|
1102 |
|
|
// cleared, as per the RFC. We need the copy because these fields are
|
1103 |
|
|
// still useful to us (and currently stored in the 'result' structure)
|
1104 |
|
|
xlen = dhcp_size_for_send(xmit);
|
1105 |
|
|
bcopy( xmit, &xmit2, xlen );
|
1106 |
|
|
xmit2.bp_yiaddr.s_addr = xmit2.bp_siaddr.s_addr = xmit2.bp_giaddr.s_addr = 0;
|
1107 |
|
|
xmit2.bp_hops = 0;
|
1108 |
|
|
if(sendto(s, &xmit2, xlen, 0,
|
1109 |
|
|
// UNICAST address of the server:
|
1110 |
|
|
(struct sockaddr *)&server_addr,
|
1111 |
|
|
sizeof(server_addr)) < 0) {
|
1112 |
|
|
*pstate = DHCPSTATE_FAILED;
|
1113 |
|
|
break;
|
1114 |
|
|
}
|
1115 |
|
|
|
1116 |
|
|
*pstate = DHCPSTATE_RENEW_RECV;
|
1117 |
|
|
break;
|
1118 |
|
|
|
1119 |
|
|
case DHCPSTATE_RENEW_RECV:
|
1120 |
|
|
// wait for an ACK or a NACK - retry by going back to
|
1121 |
|
|
// DHCPSTATE_RENEWING; NACK means go to NOTBOUND.
|
1122 |
|
|
// No answer means just wait for T2, to broadcast.
|
1123 |
|
|
|
1124 |
|
|
if (get_response(s, received, &rx_addr, &tv) < 0) {
|
1125 |
|
|
// No packet arrived
|
1126 |
|
|
// go to the next larger timeout and re-send:
|
1127 |
|
|
if ( ! next_timeout( &tv, &timeout_scratch ) ) {
|
1128 |
|
|
// If we timed out completely, just give up until T2
|
1129 |
|
|
// expires - retain the lease meanwhile. The normal
|
1130 |
|
|
// lease mechanism will invoke REBINDING as and when
|
1131 |
|
|
// necessary.
|
1132 |
|
|
*pstate = DHCPSTATE_BOUND;
|
1133 |
|
|
break;
|
1134 |
|
|
}
|
1135 |
|
|
*pstate = DHCPSTATE_RENEWING;
|
1136 |
|
|
break;
|
1137 |
|
|
}
|
1138 |
|
|
// Check for well-formed packet with correct termination (not truncated)
|
1139 |
|
|
length = dhcp_size( received );
|
1140 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
1141 |
|
|
diag_printf( "---------DHCPSTATE_RENEW_RECV received:\n" );
|
1142 |
|
|
if ( length <= 0 )
|
1143 |
|
|
diag_printf( "WARNING! malformed or truncated packet\n" );
|
1144 |
|
|
diag_printf( "...rx_addr is family %d, addr %08x, port %d\n",
|
1145 |
|
|
rx_addr.sin_family,
|
1146 |
|
|
rx_addr.sin_addr.s_addr,
|
1147 |
|
|
rx_addr.sin_port );
|
1148 |
|
|
show_bootp( intf, received );
|
1149 |
|
|
#endif
|
1150 |
|
|
if ( length <= 0 )
|
1151 |
|
|
break;
|
1152 |
|
|
if ( CHECK_XID() ) // not the same transaction;
|
1153 |
|
|
break; // listen again...
|
1154 |
|
|
|
1155 |
|
|
if ( 0 == received->bp_siaddr.s_addr ) {
|
1156 |
|
|
// then fill in from the options...
|
1157 |
|
|
length = sizeof(received->bp_siaddr.s_addr);
|
1158 |
|
|
get_bootp_option( received, TAG_DHCP_SERVER_ID,
|
1159 |
|
|
&received->bp_siaddr.s_addr,
|
1160 |
|
|
&length);
|
1161 |
|
|
}
|
1162 |
|
|
|
1163 |
|
|
// check it was a DHCP reply
|
1164 |
|
|
length = sizeof(msgtype);
|
1165 |
|
|
if ( get_bootp_option( received, TAG_DHCP_MESS_TYPE, &msgtype,
|
1166 |
|
|
&length) ) {
|
1167 |
|
|
if ( DHCPACK == msgtype // Same offer?
|
1168 |
|
|
&& received->bp_yiaddr.s_addr == xmit->bp_yiaddr.s_addr) {
|
1169 |
|
|
// we like the packet, so reset the timeout for next time
|
1170 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
1171 |
|
|
// Record the new lease and set up timers &c
|
1172 |
|
|
new_lease( received, lease );
|
1173 |
|
|
*pstate = DHCPSTATE_BOUND;
|
1174 |
|
|
break;
|
1175 |
|
|
}
|
1176 |
|
|
if ( DHCPNAK == msgtype ) { // we're bounced!
|
1177 |
|
|
*pstate = DHCPSTATE_NOTBOUND; // So quit out.
|
1178 |
|
|
break;
|
1179 |
|
|
}
|
1180 |
|
|
// otherwise it's something else, maybe another offer.
|
1181 |
|
|
// Just listen again, which implicitly discards it.
|
1182 |
|
|
}
|
1183 |
|
|
break;
|
1184 |
|
|
|
1185 |
|
|
case DHCPSTATE_REBINDING:
|
1186 |
|
|
// Just send what you got with a DHCPREQUEST in the message type.
|
1187 |
|
|
// Then wait for an ACK. This one is BROADCAST.
|
1188 |
|
|
|
1189 |
|
|
// Fill in the BOOTP request - DHCPREQUEST packet
|
1190 |
|
|
xmit->bp_xid = xid;
|
1191 |
|
|
xmit->bp_op = BOOTREQUEST;
|
1192 |
|
|
xmit->bp_flags = htons(0); // no BROADCAST FLAG
|
1193 |
|
|
// Use the *client* address here:
|
1194 |
|
|
xmit->bp_ciaddr.s_addr = xmit->bp_yiaddr.s_addr;
|
1195 |
|
|
|
1196 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MESS_TYPE, DHCPREQUEST, 1 );
|
1197 |
|
|
// These must not be set in this context
|
1198 |
|
|
unset_tag( xmit, TAG_DHCP_REQ_IP );
|
1199 |
|
|
unset_tag( xmit, TAG_DHCP_SERVER_ID );
|
1200 |
|
|
// Set all the tags we want to use when sending a packet
|
1201 |
|
|
set_default_dhcp_tags( xmit );
|
1202 |
|
|
|
1203 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
1204 |
|
|
diag_printf( "---------DHCPSTATE_REBINDING sending:\n" );
|
1205 |
|
|
show_bootp( intf, xmit );
|
1206 |
|
|
#endif
|
1207 |
|
|
// Send back a [modified] copy. Note that some fields are explicitly
|
1208 |
|
|
// cleared, as per the RFC. We need the copy because these fields are
|
1209 |
|
|
// still useful to us (and currently stored in the 'result' structure)
|
1210 |
|
|
xlen = dhcp_size_for_send( xmit );
|
1211 |
|
|
bcopy( xmit, &xmit2, xlen );
|
1212 |
|
|
xmit2.bp_yiaddr.s_addr = xmit2.bp_siaddr.s_addr = xmit2.bp_giaddr.s_addr = 0;
|
1213 |
|
|
xmit2.bp_hops = 0;
|
1214 |
|
|
if(sendto(s, &xmit2, xlen, 0,
|
1215 |
|
|
(struct sockaddr *)&broadcast_addr, sizeof(broadcast_addr)) < 0) {
|
1216 |
|
|
*pstate = DHCPSTATE_FAILED;
|
1217 |
|
|
break;
|
1218 |
|
|
}
|
1219 |
|
|
|
1220 |
|
|
*pstate = DHCPSTATE_REBIND_RECV;
|
1221 |
|
|
break;
|
1222 |
|
|
|
1223 |
|
|
case DHCPSTATE_REBIND_RECV:
|
1224 |
|
|
// wait for an ACK or a NACK - retry by going back to
|
1225 |
|
|
// DHCPSTATE_REBINDING; NACK means go to NOTBOUND.
|
1226 |
|
|
// No answer means just wait for expiry; we tried!
|
1227 |
|
|
|
1228 |
|
|
if (get_response(s, received, &rx_addr, &tv) < 0) {
|
1229 |
|
|
// No packet arrived
|
1230 |
|
|
// go to the next larger timeout and re-send:
|
1231 |
|
|
if ( ! next_timeout( &tv, &timeout_scratch ) ) {
|
1232 |
|
|
// If we timed out completely, just give up until EX
|
1233 |
|
|
// expires - retain the lease meanwhile. The normal
|
1234 |
|
|
// lease mechanism will invoke NOTBOUND state as and
|
1235 |
|
|
// when necessary.
|
1236 |
|
|
*pstate = DHCPSTATE_BOUND;
|
1237 |
|
|
break;
|
1238 |
|
|
}
|
1239 |
|
|
*pstate = DHCPSTATE_REBINDING;
|
1240 |
|
|
break;
|
1241 |
|
|
}
|
1242 |
|
|
// Check for well-formed packet with correct termination (not truncated)
|
1243 |
|
|
length = dhcp_size( received );
|
1244 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
1245 |
|
|
diag_printf( "---------DHCPSTATE_REBIND_RECV received:\n" );
|
1246 |
|
|
if ( length <= 0 )
|
1247 |
|
|
diag_printf( "WARNING! malformed or truncated packet\n" );
|
1248 |
|
|
diag_printf( "...rx_addr is family %d, addr %08x, port %d\n",
|
1249 |
|
|
rx_addr.sin_family,
|
1250 |
|
|
rx_addr.sin_addr.s_addr,
|
1251 |
|
|
rx_addr.sin_port );
|
1252 |
|
|
show_bootp( intf, received );
|
1253 |
|
|
#endif
|
1254 |
|
|
if ( length <= 0 )
|
1255 |
|
|
break;
|
1256 |
|
|
if ( CHECK_XID() ) // not the same transaction;
|
1257 |
|
|
break; // listen again...
|
1258 |
|
|
|
1259 |
|
|
if ( 0 == received->bp_siaddr.s_addr ) {
|
1260 |
|
|
// then fill in from the options...
|
1261 |
|
|
unsigned int length = sizeof(received->bp_siaddr.s_addr );
|
1262 |
|
|
get_bootp_option( received, TAG_DHCP_SERVER_ID,
|
1263 |
|
|
&received->bp_siaddr.s_addr,
|
1264 |
|
|
&length);
|
1265 |
|
|
}
|
1266 |
|
|
|
1267 |
|
|
// check it was a DHCP reply
|
1268 |
|
|
length = sizeof(msgtype);
|
1269 |
|
|
if ( get_bootp_option( received, TAG_DHCP_MESS_TYPE, &msgtype,
|
1270 |
|
|
&length) ) {
|
1271 |
|
|
if ( DHCPACK == msgtype // Same offer?
|
1272 |
|
|
&& received->bp_yiaddr.s_addr == xmit->bp_yiaddr.s_addr) {
|
1273 |
|
|
// we like the packet, so reset the timeout for next time
|
1274 |
|
|
reset_timeout( &tv, &timeout_scratch );
|
1275 |
|
|
// Record the new lease and set up timers &c
|
1276 |
|
|
new_lease( received, lease );
|
1277 |
|
|
*pstate = DHCPSTATE_BOUND;
|
1278 |
|
|
break;
|
1279 |
|
|
}
|
1280 |
|
|
else if ( DHCPNAK == msgtype ) { // we're bounced!
|
1281 |
|
|
*pstate = DHCPSTATE_NOTBOUND; // So back the start of the rigmarole.
|
1282 |
|
|
break;
|
1283 |
|
|
}
|
1284 |
|
|
// otherwise it's something else, maybe another offer.
|
1285 |
|
|
// Just listen again, which implicitly discards it.
|
1286 |
|
|
}
|
1287 |
|
|
break;
|
1288 |
|
|
|
1289 |
|
|
case DHCPSTATE_BOOTP_FALLBACK:
|
1290 |
|
|
// All done with socket
|
1291 |
|
|
close(s);
|
1292 |
|
|
s = -1;
|
1293 |
|
|
|
1294 |
|
|
// And no lease should have become active, but JIC
|
1295 |
|
|
no_lease( lease );
|
1296 |
|
|
// Re-initialize the interface with the new state
|
1297 |
|
|
if ( DHCPSTATE_BOOTP_FALLBACK != oldstate ) {
|
1298 |
|
|
// Then need to go down and up
|
1299 |
|
|
do_dhcp_down_net( intf, res, &oldstate, lease ); // oldstate used
|
1300 |
|
|
if ( 0 != oldstate ) {
|
1301 |
|
|
// Then not called from init_all_network_interfaces()
|
1302 |
|
|
// so we must initialize the interface ourselves
|
1303 |
|
|
if (!init_net(intf, res)) {
|
1304 |
|
|
do_dhcp_down_net( intf, res, pstate, lease );
|
1305 |
|
|
*pstate = DHCPSTATE_FAILED;
|
1306 |
|
|
goto out;
|
1307 |
|
|
}
|
1308 |
|
|
}
|
1309 |
|
|
}
|
1310 |
|
|
|
1311 |
|
|
// Otherwise, nothing whatsoever to do...
|
1312 |
|
|
return true;
|
1313 |
|
|
|
1314 |
|
|
case DHCPSTATE_NOTBOUND:
|
1315 |
|
|
// All done with socket
|
1316 |
|
|
close(s);
|
1317 |
|
|
// No lease active
|
1318 |
|
|
no_lease( lease );
|
1319 |
|
|
// Leave interface up so app can tidy.
|
1320 |
|
|
return true;
|
1321 |
|
|
|
1322 |
|
|
case DHCPSTATE_FAILED:
|
1323 |
|
|
// All done with socket
|
1324 |
|
|
close(s);
|
1325 |
|
|
// No lease active
|
1326 |
|
|
no_lease( lease );
|
1327 |
|
|
// Unconditionally down the interface.
|
1328 |
|
|
do_dhcp_down_net( intf, res, &oldstate, lease );
|
1329 |
|
|
return false;
|
1330 |
|
|
|
1331 |
|
|
case DHCPSTATE_DO_RELEASE:
|
1332 |
|
|
// We have been forced here by external means, to release the
|
1333 |
|
|
// lease for graceful shutdown.
|
1334 |
|
|
|
1335 |
|
|
// Just send what you got with a DHCPRELEASE in the message
|
1336 |
|
|
// type UNICAST straight to the server. No ACK. Then go to
|
1337 |
|
|
// NOTBOUND state.
|
1338 |
|
|
NEW_XID( xid );
|
1339 |
|
|
xmit->bp_xid = xid;
|
1340 |
|
|
xmit->bp_op = BOOTREQUEST;
|
1341 |
|
|
xmit->bp_flags = htons(0); // no BROADCAST FLAG
|
1342 |
|
|
// Use the *client* address here:
|
1343 |
|
|
xmit->bp_ciaddr.s_addr = xmit->bp_yiaddr.s_addr;
|
1344 |
|
|
|
1345 |
|
|
set_fixed_tag( xmit, TAG_DHCP_MESS_TYPE, DHCPRELEASE, 1 );
|
1346 |
|
|
|
1347 |
|
|
// Set unicast address to *server*
|
1348 |
|
|
server_addr.sin_addr.s_addr = res->bp_siaddr.s_addr;
|
1349 |
|
|
|
1350 |
|
|
#ifdef CYGDBG_NET_DHCP_CHATTER
|
1351 |
|
|
diag_printf( "---------DHCPSTATE_DO_RELEASE sending:\n" );
|
1352 |
|
|
diag_printf( "UNICAST to family %d, addr %08x, port %d\n",
|
1353 |
|
|
server_addr.sin_family,
|
1354 |
|
|
server_addr.sin_addr.s_addr,
|
1355 |
|
|
server_addr.sin_port );
|
1356 |
|
|
show_bootp( intf, xmit );
|
1357 |
|
|
#endif
|
1358 |
|
|
// Send back a [modified] copy. Note that some fields are explicitly
|
1359 |
|
|
// cleared, as per the RFC. We need the copy because these fields are
|
1360 |
|
|
// still useful to us (and currently stored in the 'result' structure)
|
1361 |
|
|
xlen = dhcp_size_for_send( xmit );
|
1362 |
|
|
bcopy( xmit, &xmit2, xlen );
|
1363 |
|
|
xmit2.bp_yiaddr.s_addr = xmit2.bp_siaddr.s_addr = xmit2.bp_giaddr.s_addr = 0;
|
1364 |
|
|
xmit2.bp_hops = 0;
|
1365 |
|
|
if(sendto(s, &xmit2, xlen, 0,
|
1366 |
|
|
// UNICAST address of the server:
|
1367 |
|
|
(struct sockaddr *)&server_addr,
|
1368 |
|
|
sizeof(server_addr)) < 0) {
|
1369 |
|
|
*pstate = DHCPSTATE_FAILED;
|
1370 |
|
|
break;
|
1371 |
|
|
}
|
1372 |
|
|
|
1373 |
|
|
*pstate = DHCPSTATE_NOTBOUND;
|
1374 |
|
|
break;
|
1375 |
|
|
|
1376 |
|
|
default:
|
1377 |
|
|
no_lease( lease );
|
1378 |
|
|
close(s);
|
1379 |
|
|
return false;
|
1380 |
|
|
}
|
1381 |
|
|
}
|
1382 |
|
|
out:
|
1383 |
|
|
if (s != -1)
|
1384 |
|
|
close (s);
|
1385 |
|
|
|
1386 |
|
|
return false;
|
1387 |
|
|
}
|
1388 |
|
|
|
1389 |
|
|
// ------------------------------------------------------------------------
|
1390 |
|
|
// Bring an interface down, failed to initialize it or lease is expired
|
1391 |
|
|
// Also part of normal startup, bring down for proper reinitialization
|
1392 |
|
|
|
1393 |
|
|
int
|
1394 |
|
|
do_dhcp_down_net(const char *intf, struct bootp *res,
|
1395 |
|
|
cyg_uint8 *pstate, struct dhcp_lease *lease)
|
1396 |
|
|
{
|
1397 |
|
|
struct sockaddr_in *addrp;
|
1398 |
|
|
struct ifreq ifr;
|
1399 |
|
|
int s = -1;
|
1400 |
|
|
int retcode = false;
|
1401 |
|
|
|
1402 |
|
|
// Ensure clean slate
|
1403 |
|
|
cyg_route_reinit(); // Force any existing routes to be forgotten
|
1404 |
|
|
|
1405 |
|
|
s = socket(AF_INET, SOCK_DGRAM, 0);
|
1406 |
|
|
if (s < 0) {
|
1407 |
|
|
perror("socket");
|
1408 |
|
|
goto out;
|
1409 |
|
|
}
|
1410 |
|
|
|
1411 |
|
|
addrp = (struct sockaddr_in *) &ifr.ifr_addr;
|
1412 |
|
|
|
1413 |
|
|
// Remove any existing address
|
1414 |
|
|
if ( DHCPSTATE_FAILED == *pstate
|
1415 |
|
|
|| DHCPSTATE_INIT == *pstate
|
1416 |
|
|
|| 0 == *pstate ) {
|
1417 |
|
|
// it was configured for broadcast only, "half-up"
|
1418 |
|
|
memset(addrp, 0, sizeof(*addrp));
|
1419 |
|
|
addrp->sin_family = AF_INET;
|
1420 |
|
|
addrp->sin_len = sizeof(*addrp);
|
1421 |
|
|
addrp->sin_port = 0;
|
1422 |
|
|
addrp->sin_addr.s_addr = INADDR_ANY;
|
1423 |
|
|
}
|
1424 |
|
|
else {
|
1425 |
|
|
// get the specific address that was used
|
1426 |
|
|
strcpy(ifr.ifr_name, intf);
|
1427 |
|
|
if (ioctl(s, SIOCGIFADDR, &ifr)) {
|
1428 |
|
|
perror("SIOCGIFADDR 1");
|
1429 |
|
|
goto out;
|
1430 |
|
|
}
|
1431 |
|
|
}
|
1432 |
|
|
|
1433 |
|
|
strcpy(ifr.ifr_name, intf);
|
1434 |
|
|
if (ioctl(s, SIOCDIFADDR, &ifr)) { /* delete IF addr */
|
1435 |
|
|
perror("SIOCDIFADDR1");
|
1436 |
|
|
}
|
1437 |
|
|
|
1438 |
|
|
#ifdef INET6
|
1439 |
|
|
{
|
1440 |
|
|
int s6;
|
1441 |
|
|
struct if_laddrreq iflr;
|
1442 |
|
|
|
1443 |
|
|
s6 = socket(AF_INET6, SOCK_DGRAM, 0);
|
1444 |
|
|
if (s6 < 0) {
|
1445 |
|
|
perror("socket AF_INET6");
|
1446 |
|
|
close (s);
|
1447 |
|
|
return false;
|
1448 |
|
|
}
|
1449 |
|
|
// Now delete the ipv6 addr
|
1450 |
|
|
memset(&iflr,0,sizeof(iflr));
|
1451 |
|
|
strcpy(iflr.iflr_name, intf);
|
1452 |
|
|
if (!ioctl(s6, SIOCGLIFADDR, &iflr)) {
|
1453 |
|
|
|
1454 |
|
|
strcpy(iflr.iflr_name, intf);
|
1455 |
|
|
if (ioctl(s6, SIOCDLIFADDR, &ifr)) { /* delete IF addr */
|
1456 |
|
|
perror("SIOCDIFADDR_IN61");
|
1457 |
|
|
}
|
1458 |
|
|
}
|
1459 |
|
|
close(s6);
|
1460 |
|
|
}
|
1461 |
|
|
#endif /* IP6 */
|
1462 |
|
|
|
1463 |
|
|
// Shut down interface so it can be reinitialized
|
1464 |
|
|
ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
|
1465 |
|
|
if (ioctl(s, SIOCSIFFLAGS, &ifr)) { /* set ifnet flags */
|
1466 |
|
|
perror("SIOCSIFFLAGS down");
|
1467 |
|
|
goto out;
|
1468 |
|
|
}
|
1469 |
|
|
retcode = true;
|
1470 |
|
|
|
1471 |
|
|
if ( 0 != *pstate ) // preserve initial state
|
1472 |
|
|
*pstate = DHCPSTATE_INIT;
|
1473 |
|
|
|
1474 |
|
|
|
1475 |
|
|
out:
|
1476 |
|
|
if (s != -1)
|
1477 |
|
|
close(s);
|
1478 |
|
|
|
1479 |
|
|
return retcode;
|
1480 |
|
|
}
|
1481 |
|
|
|
1482 |
|
|
// ------------------------------------------------------------------------
|
1483 |
|
|
// Release (relinquish) a leased address - if we have one - and bring down
|
1484 |
|
|
// the interface.
|
1485 |
|
|
int
|
1486 |
|
|
do_dhcp_release(const char *intf, struct bootp *res,
|
1487 |
|
|
cyg_uint8 *pstate, struct dhcp_lease *lease)
|
1488 |
|
|
{
|
1489 |
|
|
if ( 0 != *pstate
|
1490 |
|
|
&& DHCPSTATE_INIT != *pstate
|
1491 |
|
|
&& DHCPSTATE_NOTBOUND != *pstate
|
1492 |
|
|
&& DHCPSTATE_FAILED != *pstate
|
1493 |
|
|
&& DHCPSTATE_BOOTP_FALLBACK != *pstate ) {
|
1494 |
|
|
*pstate = DHCPSTATE_DO_RELEASE;
|
1495 |
|
|
do_dhcp( intf, res, pstate, lease ); // to send the release packet
|
1496 |
|
|
cyg_thread_delay( 100 ); // to let it leave the building
|
1497 |
|
|
}
|
1498 |
|
|
return true;
|
1499 |
|
|
}
|
1500 |
|
|
|
1501 |
|
|
// ------------------------------------------------------------------------
|
1502 |
|
|
|
1503 |
|
|
#endif // CYGPKG_NET_DHCP
|
1504 |
|
|
|
1505 |
|
|
// EOF dhcp_prot.c
|