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Sweden-Number/dlls/icmp/icmp_main.c

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/*
* ICMP
*
* Francois Gouget, 1999, based on the work of
* RW Hall, 1999, based on public domain code PING.C by Mike Muus (1983)
* and later works (c) 1989 Regents of Univ. of California - see copyright
* notice at end of source-code.
*/
/* Future work:
* - Systems like FreeBSD don't seem to support the IP_TTL option and maybe others.
* But using IP_HDRINCL and building the IP header by hand might work.
* - Not all IP options are supported.
* - Are ICMP handles real handles, i.e. inheritable and all? There might be some
* more work to do here, including server side stuff with synchronization.
* - Is it correct to use malloc for the internal buffer, for allocating the
* handle's structure?
* - This API should probably be thread safe. Is it really?
* - Using the winsock functions has not been tested.
*/
#include "config.h"
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#include <netdb.h>
#include <netinet/in_systm.h>
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <sys/time.h>
#include <malloc.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#include "windef.h"
#include "winbase.h"
#ifdef ICMP_WIN
#include "winsock.h"
#endif
#include "winerror.h"
#include "wine/ipexport.h"
#include "wine/icmpapi.h"
#include "debugtools.h"
/* Set up endiannes macros for the ip and ip_icmp BSD headers */
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#endif
#ifndef BYTE_ORDER
#ifdef WORDS_BIGENDIAN
#define BYTE_ORDER BIG_ENDIAN
#else
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#endif /* BYTE_ORDER */
#define u_int16_t WORD
#define u_int32_t DWORD
/* These are BSD headers. We use these here because they are needed on
* libc5 Linux systems. On other platforms they are usually simply more
* complete than the native stuff, and cause less portability problems
* so we use them anyway.
*/
#include "ip.h"
#include "ip_icmp.h"
DEFAULT_DEBUG_CHANNEL(icmp)
/* Define the following macro to use the winsock functions */
/*#define ICMP_WIN*/
#ifdef ICMP_WIN
/* FIXME: should we include winsock.h ???*/
SOCKET WINAPI WINSOCK_socket(INT af, INT type, INT protocol);
INT WINAPI WINSOCK_sendto(SOCKET s, char *buf, INT len, INT flags, struct sockaddr *to, INT tolen);
INT WINAPI WINSOCK_recvfrom(SOCKET s, char *buf,INT len, INT flags, struct sockaddr *from, INT *fromlen32);
INT WINAPI WINSOCK_shutdown(SOCKET s, INT how);
#endif
#ifdef ICMP_WIN
#define ISOCK_SOCKET SOCKET
#define ISOCK_ISVALID(a) ((a)!=INVALID_SOCKET)
#define ISOCK_getsockopt(a,b,c,d,e) WINSOCK_getsockopt(a,b,c,d,e)
#define ISOCK_recvfrom(a,b,c,d,e,f) WINSOCK_recvfrom(a,b,c,d,e,f)
#define ISOCK_select(a,b,c,d,e) WINSOCK_select(a,b,c,d,e)
#define ISOCK_sendto(a,b,c,d,e,f) WINSOCK_sendto(a,b,c,d,e,f)
#define ISOCK_setsockopt(a,b,c,d,e) WINSOCK_setsockopt(a,b,c,d,e)
#define ISOCK_shutdown(a,b) WINSOCK_shutdown(a,b)
#define ISOCK_socket(a,b,c) WINSOCK_socket(a,b,c)
#else
#define ISOCK_SOCKET int
#define ISOCK_ISVALID(a) ((a)>=0)
#define ISOCK_getsockopt(a,b,c,d,e) getsockopt(a,b,c,d,e)
#define ISOCK_recvfrom(a,b,c,d,e,f) recvfrom(a,b,c,d,e,f)
#define ISOCK_select(a,b,c,d,e) select(a,b,c,d,e)
#define ISOCK_setsockopt(a,b,c,d,e) setsockopt(a,b,c,d,e)
#define ISOCK_sendto(a,b,c,d,e,f) sendto(a,b,c,d,e,f)
#define ISOCK_shutdown(a,b) shutdown(a,b)
#define ISOCK_socket(a,b,c) socket(a,b,c)
#endif
typedef struct {
ISOCK_SOCKET sid;
IP_OPTION_INFORMATION default_opts;
} icmp_t;
#define IP_OPTS_UNKNOWN 0
#define IP_OPTS_DEFAULT 1
#define IP_OPTS_CUSTOM 2
/* The sequence number is unique process wide, so that all threads
* have a distinct sequence number.
*/
static LONG icmp_sequence=0;
static int in_cksum(u_short *addr, int len)
{
int nleft=len;
u_short *w = addr;
int sum = 0;
u_short answer = 0;
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
if (nleft == 1) {
*(u_char *)(&answer) = *(u_char *)w;
sum += answer;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
answer = ~sum;
return(answer);
}
/*
* Exported Routines.
*/
HANDLE WINAPI IcmpCreateFile(VOID)
{
icmp_t* icp;
ISOCK_SOCKET sid=ISOCK_socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
if (!ISOCK_ISVALID(sid)) {
MESSAGE("WARNING: Trying to use ICMP will fail unless running as root\n");
SetLastError(ERROR_ACCESS_DENIED);
return INVALID_HANDLE_VALUE;
}
icp=malloc(sizeof(*icp));
if (icp==NULL) {
SetLastError(IP_NO_RESOURCES);
return INVALID_HANDLE_VALUE;
}
icp->sid=sid;
icp->default_opts.OptionsSize=IP_OPTS_UNKNOWN;
return (HANDLE)icp;
}
BOOL WINAPI IcmpCloseHandle(HANDLE IcmpHandle)
{
icmp_t* icp=(icmp_t*)IcmpHandle;
ISOCK_shutdown(icp->sid,2);
free(icp);
return TRUE;
}
DWORD WINAPI IcmpSendEcho(
HANDLE IcmpHandle,
IPAddr DestinationAddress,
LPVOID RequestData,
WORD RequestSize,
PIP_OPTION_INFORMATION RequestOptions,
LPVOID ReplyBuffer,
DWORD ReplySize,
DWORD Timeout
)
{
icmp_t* icp=(icmp_t*)IcmpHandle;
unsigned char* reqbuf;
int reqsize;
struct icmp_echo_reply* ier;
struct ip* ip_header;
struct icmp* icmp_header;
char* endbuf;
int ip_header_len;
int maxlen;
fd_set fdr;
struct timeval timeout,send_time,recv_time;
struct sockaddr_in addr;
int addrlen;
unsigned short id,seq,cksum;
int res;
if (ReplySize<sizeof(ICMP_ECHO_REPLY)+ICMP_MINLEN) {
SetLastError(IP_BUF_TOO_SMALL);
return 0;
}
/* check the request size against SO_MAX_MSG_SIZE using getsockopt */
/* Prepare the request */
id=getpid() & 0xFFFF;
seq=InterlockedIncrement(&icmp_sequence) & 0xFFFF;
reqsize=ICMP_MINLEN+RequestSize;
reqbuf=malloc(reqsize);
if (reqbuf==NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return 0;
}
icmp_header=(struct icmp*)reqbuf;
icmp_header->icmp_type=ICMP_ECHO;
icmp_header->icmp_code=0;
icmp_header->icmp_cksum=0;
icmp_header->icmp_id=id;
icmp_header->icmp_seq=seq;
memcpy(reqbuf+ICMP_MINLEN, RequestData, RequestSize);
icmp_header->icmp_cksum=cksum=in_cksum((u_short*)reqbuf,reqsize);
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=DestinationAddress;
addr.sin_port=0;
if (RequestOptions!=NULL) {
int val;
if (icp->default_opts.OptionsSize==IP_OPTS_UNKNOWN) {
int len;
/* Before we mess with the options, get the default values */
len=sizeof(val);
ISOCK_getsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,&len);
icp->default_opts.Ttl=val;
len=sizeof(val);
ISOCK_getsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,&len);
icp->default_opts.Tos=val;
/* FIXME: missing: handling of IP 'flags', and all the other options */
}
val=RequestOptions->Ttl;
ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
val=RequestOptions->Tos;
ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
/* FIXME: missing: handling of IP 'flags', and all the other options */
icp->default_opts.OptionsSize=IP_OPTS_CUSTOM;
} else if (icp->default_opts.OptionsSize==IP_OPTS_CUSTOM) {
int val;
/* Restore the default options */
val=icp->default_opts.Ttl;
ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
val=icp->default_opts.Tos;
ISOCK_setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
/* FIXME: missing: handling of IP 'flags', and all the other options */
icp->default_opts.OptionsSize=IP_OPTS_DEFAULT;
}
/* Get ready for receiving the reply
* Do it before we send the request to minimize the risk of introducing delays
*/
FD_ZERO(&fdr);
FD_SET(icp->sid,&fdr);
timeout.tv_sec=Timeout/1000;
timeout.tv_usec=(Timeout % 1000)*1000;
addrlen=sizeof(addr);
ier=ReplyBuffer;
ip_header=ReplyBuffer+sizeof(ICMP_ECHO_REPLY);
endbuf=ReplyBuffer+ReplySize;
maxlen=ReplySize-sizeof(ICMP_ECHO_REPLY);
/* Send the packet */
TRACE("Sending %d bytes (RequestSize=%d) to %s\n", reqsize, RequestSize, inet_ntoa(addr.sin_addr));
#if 0
if (TRACE_ON(icmp)){
unsigned char* buf=(unsigned char*)reqbuf;
int i;
printf("Output buffer:\n");
for (i=0;i<reqsize;i++)
printf("%2x,", buf[i]);
printf("\n");
}
#endif
gettimeofday(&send_time,NULL);
res=ISOCK_sendto(icp->sid, reqbuf, reqsize, 0, (struct sockaddr*)&addr, sizeof(addr));
free(reqbuf);
if (res<0) {
if (errno==EMSGSIZE)
SetLastError(IP_PACKET_TOO_BIG);
else {
switch (errno) {
case ENETUNREACH:
SetLastError(IP_DEST_NET_UNREACHABLE);
break;
case EHOSTUNREACH:
SetLastError(IP_DEST_NET_UNREACHABLE);
break;
default:
TRACE("unknown error: errno=%d\n",errno);
SetLastError(ERROR_UNKNOWN);
}
}
return 0;
}
/* Get the reply */
ip_header_len=0; /* because gcc was complaining */
while ((res=ISOCK_select(icp->sid+1,&fdr,NULL,NULL,&timeout))>0) {
gettimeofday(&recv_time,NULL);
res=ISOCK_recvfrom(icp->sid, (char*)ip_header, maxlen, 0, (struct sockaddr*)&addr,&addrlen);
TRACE("received %d bytes from %s\n",res, inet_ntoa(addr.sin_addr));
ier->Status=IP_REQ_TIMED_OUT;
/* Check whether we should ignore this packet */
if ((ip_header->ip_p==IPPROTO_ICMP) && (res>=sizeof(struct ip)+ICMP_MINLEN)) {
ip_header_len=ip_header->ip_hl << 2;
icmp_header=(struct icmp*)(((char*)ip_header)+ip_header_len);
TRACE("received an ICMP packet of type,code=%d,%d\n",icmp_header->icmp_type,icmp_header->icmp_code);
if (icmp_header->icmp_type==ICMP_ECHOREPLY) {
if ((icmp_header->icmp_id==id) && (icmp_header->icmp_seq==seq))
ier->Status=IP_SUCCESS;
} else {
switch (icmp_header->icmp_type) {
case ICMP_UNREACH:
switch (icmp_header->icmp_code) {
case ICMP_UNREACH_HOST:
#ifdef ICMP_UNREACH_HOST_UNKNOWN
case ICMP_UNREACH_HOST_UNKNOWN:
#endif
#ifdef ICMP_UNREACH_ISOLATED
case ICMP_UNREACH_ISOLATED:
#endif
#ifdef ICMP_UNREACH_HOST_PROHIB
case ICMP_UNREACH_HOST_PROHIB:
#endif
#ifdef ICMP_UNREACH_TOSHOST
case ICMP_UNREACH_TOSHOST:
#endif
ier->Status=IP_DEST_HOST_UNREACHABLE;
break;
case ICMP_UNREACH_PORT:
ier->Status=IP_DEST_PORT_UNREACHABLE;
break;
case ICMP_UNREACH_PROTOCOL:
ier->Status=IP_DEST_PROT_UNREACHABLE;
break;
case ICMP_UNREACH_SRCFAIL:
ier->Status=IP_BAD_ROUTE;
break;
default:
ier->Status=IP_DEST_NET_UNREACHABLE;
}
break;
case ICMP_TIMXCEED:
if (icmp_header->icmp_code==ICMP_TIMXCEED_REASS)
ier->Status=IP_TTL_EXPIRED_REASSEM;
else
ier->Status=IP_TTL_EXPIRED_TRANSIT;
break;
case ICMP_PARAMPROB:
ier->Status=IP_PARAM_PROBLEM;
break;
case ICMP_SOURCEQUENCH:
ier->Status=IP_SOURCE_QUENCH;
break;
}
if (ier->Status!=IP_REQ_TIMED_OUT) {
struct ip* rep_ip_header;
struct icmp* rep_icmp_header;
/* The ICMP header size of all the packets we accept is the same */
rep_ip_header=(struct ip*)(((char*)icmp_header)+ICMP_MINLEN);
rep_icmp_header=(struct icmp*)(((char*)rep_ip_header)+(rep_ip_header->ip_hl << 2));
/* Make sure that this is really a reply to our packet */
if (ip_header_len+ICMP_MINLEN+(rep_ip_header->ip_hl << 2)+ICMP_MINLEN>ip_header->ip_len) {
ier->Status=IP_REQ_TIMED_OUT;
} else if ((rep_icmp_header->icmp_type!=ICMP_ECHO) ||
(rep_icmp_header->icmp_code!=0) ||
(rep_icmp_header->icmp_id!=id) ||
(rep_icmp_header->icmp_seq!=seq) ||
(rep_icmp_header->icmp_cksum!=cksum)) {
/* This was not a reply to one of our packets after all */
TRACE("skipping type,code=%d,%d id,seq=%d,%d cksum=%d\n",
rep_icmp_header->icmp_type,rep_icmp_header->icmp_code,
rep_icmp_header->icmp_id,rep_icmp_header->icmp_seq,
rep_icmp_header->icmp_cksum);
TRACE("expected type,code=8,0 id,seq=%d,%d cksum=%d\n",
id,seq,
cksum);
ier->Status=IP_REQ_TIMED_OUT;
}
}
}
}
if (ier->Status==IP_REQ_TIMED_OUT) {
/* This packet was not for us.
* Decrease the timeout so that we don't enter an endless loop even
* if we get flooded with ICMP packets that are not for us.
*/
timeout.tv_sec=Timeout/1000-(recv_time.tv_sec-send_time.tv_sec);
timeout.tv_usec=(Timeout % 1000)*1000+send_time.tv_usec-(recv_time.tv_usec-send_time.tv_usec);
if (timeout.tv_usec<0) {
timeout.tv_usec+=1000000;
timeout.tv_sec--;
}
continue;
} else {
/* This is a reply to our packet */
memcpy(&ier->Address,&ip_header->ip_src,sizeof(IPAddr));
/* Status is already set */
ier->RoundTripTime=(recv_time.tv_sec-send_time.tv_sec)*1000+(recv_time.tv_usec-send_time.tv_usec)/1000;
ier->DataSize=res-ip_header_len-ICMP_MINLEN;
ier->Reserved=0;
ier->Data=endbuf-ier->DataSize;
memmove(ier->Data,((char*)ip_header)+ip_header_len+ICMP_MINLEN,ier->DataSize);
ier->Options.Ttl=ip_header->ip_ttl;
ier->Options.Tos=ip_header->ip_tos;
ier->Options.Flags=ip_header->ip_off >> 13;
ier->Options.OptionsSize=ip_header_len-sizeof(struct ip);
if (ier->Options.OptionsSize!=0) {
ier->Options.OptionsData=ier->Data-ier->Options.OptionsSize;
/* FIXME: We are supposed to rearrange the option's 'source route' data */
memmove(ier->Options.OptionsData,((char*)ip_header)+ip_header_len,ier->Options.OptionsSize);
endbuf=ier->Options.OptionsData;
} else {
ier->Options.OptionsData=NULL;
endbuf=ier->Data;
}
/* Prepare for the next packet */
ier++;
ip_header=(struct ip*)(((char*)ip_header)+sizeof(ICMP_ECHO_REPLY));
maxlen=endbuf-(char*)ip_header;
/* Check out whether there is more but don't wait this time */
timeout.tv_sec=0;
timeout.tv_usec=0;
}
FD_ZERO(&fdr);
FD_SET(icp->sid,&fdr);
}
res=ier-(ICMP_ECHO_REPLY*)ReplyBuffer;
if (res==0)
SetLastError(IP_REQ_TIMED_OUT);
TRACE("received %d replies\n",res);
return res;
}
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Muuss.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
*/
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