184 lines
5.5 KiB
C
Executable File
184 lines
5.5 KiB
C
Executable File
/* icmp.c
|
|
|
|
ICMP Protocol engine - for sending out pings and receiving
|
|
responses. */
|
|
|
|
/*
|
|
* Copyright (c) 1997, 1998 The Internet Software Consortium.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of The Internet Software Consortium nor the names
|
|
* of its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
|
|
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This software has been written for the Internet Software Consortium
|
|
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
|
|
* Enterprises. To learn more about the Internet Software Consortium,
|
|
* see ``http://www.vix.com/isc''. To learn more about Vixie
|
|
* Enterprises, see ``http://www.vix.com''.
|
|
*/
|
|
|
|
#ifndef lint
|
|
#ifndef EMBED
|
|
static char copyright[] =
|
|
"$Id: //BBN_Linux/Branch/Branch_for_Rel_TP_ASEAN_20161216/tclinux_phoenix/apps/public/dhcp-isc/common/icmp.c#1 $ Copyright (c) 1997, 1998 The Internet Software Consortium. All rights reserved.\n";
|
|
#endif /*!EMBED*/
|
|
#endif /* not lint */
|
|
|
|
#include "../includes/dhcpd.h"
|
|
#include "../includes/netinet/ip.h"
|
|
//#include <netinet/ip.h>
|
|
#include "../includes/netinet/ip_icmp.h"
|
|
|
|
static int icmp_protocol_initialized;
|
|
static int icmp_protocol_fd;
|
|
|
|
/* Initialize the ICMP protocol. */
|
|
|
|
void icmp_startup (routep, handler)
|
|
int routep;
|
|
void (*handler) PROTO ((struct iaddr *, u_int8_t *, int));
|
|
{
|
|
struct protoent *proto;
|
|
int protocol = 1;
|
|
int state;
|
|
|
|
/* Only initialize icmp once. */
|
|
if (icmp_protocol_initialized)
|
|
error ("attempted to reinitialize icmp protocol");
|
|
icmp_protocol_initialized = 1;
|
|
|
|
/* Get the protocol number (should be 1). */
|
|
|
|
#ifndef EMBED
|
|
proto = getprotobyname ("icmp");
|
|
if (proto)
|
|
protocol = proto -> p_proto;
|
|
#else
|
|
protocol = ntohs(1);
|
|
#endif /*!EMBED*/
|
|
|
|
/* Get a raw socket for the ICMP protocol. */
|
|
icmp_protocol_fd = socket (AF_INET, SOCK_RAW, protocol);
|
|
if (icmp_protocol_fd < 0)
|
|
error ("unable to create icmp socket: %m");
|
|
|
|
/* Make sure it does routing... */
|
|
state = 0;
|
|
if (setsockopt (icmp_protocol_fd, SOL_SOCKET, SO_DONTROUTE,
|
|
(char *)&state, sizeof state) < 0)
|
|
error ("Unable to disable SO_DONTROUTE on ICMP socket: %m");
|
|
|
|
add_protocol ("icmp", icmp_protocol_fd, icmp_echoreply,
|
|
(void *)handler);
|
|
}
|
|
|
|
int icmp_echorequest (addr)
|
|
struct iaddr *addr;
|
|
{
|
|
struct sockaddr_in to;
|
|
struct icmp icmp;
|
|
int status;
|
|
|
|
if (!icmp_protocol_initialized)
|
|
error ("attempt to use ICMP protocol before initialization.");
|
|
|
|
#ifdef HAVE_SA_LEN
|
|
to.sin_len = sizeof to;
|
|
#endif
|
|
to.sin_family = AF_INET;
|
|
to.sin_port = 0; /* unused. */
|
|
memcpy (&to.sin_addr, addr -> iabuf, sizeof to.sin_addr); /* XXX */
|
|
|
|
icmp.icmp_type = ICMP_ECHO;
|
|
icmp.icmp_code = 0;
|
|
icmp.icmp_cksum = 0;
|
|
icmp.icmp_seq = 0;
|
|
#ifdef PTRSIZE_64BIT
|
|
icmp.icmp_id = (((u_int32_t)(u_int64_t)addr) ^
|
|
(u_int32_t)(((u_int64_t)addr) >> 32));
|
|
#else
|
|
icmp.icmp_id = (u_int32_t)addr;
|
|
#endif
|
|
|
|
icmp.icmp_cksum = wrapsum (checksum ((unsigned char *)&icmp,
|
|
sizeof icmp, 0));
|
|
|
|
/* Send the ICMP packet... */
|
|
status = sendto (icmp_protocol_fd, (char *)&icmp, sizeof icmp, 0,
|
|
(struct sockaddr *)&to, sizeof to);
|
|
if (status < 0)
|
|
warn ("icmp_echorequest %s: %m", inet_ntoa(to.sin_addr));
|
|
|
|
if (status != sizeof icmp)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void icmp_echoreply (protocol)
|
|
struct protocol *protocol;
|
|
{
|
|
struct icmp *icfrom;
|
|
struct sockaddr_in from;
|
|
u_int8_t icbuf [1500];
|
|
int status;
|
|
int len;
|
|
struct iaddr ia;
|
|
void (*handler) PROTO ((struct iaddr *, u_int8_t *, int));
|
|
|
|
len = sizeof from;
|
|
status = recvfrom (protocol -> fd, (char *)icbuf, sizeof icbuf, 0,
|
|
(struct sockaddr *)&from, &len);
|
|
if (status < 0) {
|
|
warn ("icmp_echoreply: %m");
|
|
return;
|
|
}
|
|
|
|
/* Probably not for us. */
|
|
if (status < (sizeof (struct ip)) + (sizeof *icfrom)) {
|
|
return;
|
|
}
|
|
|
|
len = status - sizeof (struct ip);
|
|
icfrom = (struct icmp *)(icbuf + sizeof (struct ip));
|
|
|
|
/* Silently discard ICMP packets that aren't echoreplies. */
|
|
if (icfrom -> icmp_type != ICMP_ECHOREPLY) {
|
|
return;
|
|
}
|
|
|
|
/* If we were given a second-stage handler, call it. */
|
|
if (protocol -> local) {
|
|
handler = ((void (*) PROTO ((struct iaddr *,
|
|
u_int8_t *, int)))
|
|
protocol -> local);
|
|
memcpy (ia.iabuf, &from.sin_addr, sizeof from.sin_addr);
|
|
ia.len = sizeof from.sin_addr;
|
|
|
|
(*handler) (&ia, icbuf, len);
|
|
}
|
|
}
|