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510 lines
17 KiB
C
510 lines
17 KiB
C
/*
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* ICMP
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*
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* Francois Gouget, 1999, based on the work of
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* RW Hall, 1999, based on public domain code PING.C by Mike Muus (1983)
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* and later works (c) 1989 Regents of Univ. of California - see copyright
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* notice at end of source-code.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* Future work:
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* - Systems like FreeBSD don't seem to support the IP_TTL option and maybe others.
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* But using IP_HDRINCL and building the IP header by hand might work.
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* - Not all IP options are supported.
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* - Are ICMP handles real handles, i.e. inheritable and all? There might be some
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* more work to do here, including server side stuff with synchronization.
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* - Is it correct to use malloc for the internal buffer, for allocating the
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* handle's structure?
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* - This API should probably be thread safe. Is it really?
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* - Using the winsock functions has not been tested.
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*/
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#include "config.h"
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#ifdef HAVE_NETDB_H
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# include <netdb.h>
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#endif
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#ifdef HAVE_NETINET_IN_SYSTM_H
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# include <netinet/in_systm.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#endif
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#ifdef HAVE_SYS_POLL_H
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# include <sys/poll.h>
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#endif
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#include "windef.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "ipexport.h"
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#include "icmpapi.h"
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#include "wine/debug.h"
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/* Set up endiannes macros for the ip and ip_icmp BSD headers */
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN 4321
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#endif
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN 1234
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#endif
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#ifndef BYTE_ORDER
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#ifdef WORDS_BIGENDIAN
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#define BYTE_ORDER BIG_ENDIAN
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#else
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#define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#endif /* BYTE_ORDER */
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#define u_int16_t WORD
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#define u_int32_t DWORD
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/* These are BSD headers. We use these here because they are needed on
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* libc5 Linux systems. On other platforms they are usually simply more
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* complete than the native stuff, and cause less portability problems
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* so we use them anyway.
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*/
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#include "ip.h"
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#include "ip_icmp.h"
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WINE_DEFAULT_DEBUG_CHANNEL(icmp);
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typedef struct {
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int sid;
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IP_OPTION_INFORMATION default_opts;
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} icmp_t;
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#define IP_OPTS_UNKNOWN 0
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#define IP_OPTS_DEFAULT 1
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#define IP_OPTS_CUSTOM 2
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/* The sequence number is unique process wide, so that all threads
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* have a distinct sequence number.
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*/
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static LONG icmp_sequence=0;
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static int in_cksum(u_short *addr, int len)
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{
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int nleft=len;
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u_short *w = addr;
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int sum = 0;
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u_short answer = 0;
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while (nleft > 1) {
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sum += *w++;
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nleft -= 2;
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}
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if (nleft == 1) {
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*(u_char *)(&answer) = *(u_char *)w;
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sum += answer;
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}
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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answer = ~sum;
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return(answer);
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}
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/*
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* Exported Routines.
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*/
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/***********************************************************************
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* IcmpCreateFile (ICMP.@)
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*/
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HANDLE WINAPI IcmpCreateFile(VOID)
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{
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icmp_t* icp;
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int sid=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
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if (sid < 0) {
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MESSAGE("WARNING: Trying to use ICMP (network ping) will fail unless running as root\n");
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SetLastError(ERROR_ACCESS_DENIED);
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return INVALID_HANDLE_VALUE;
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}
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icp=HeapAlloc(GetProcessHeap(), 0, sizeof(*icp));
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if (icp==NULL) {
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SetLastError(IP_NO_RESOURCES);
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return INVALID_HANDLE_VALUE;
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}
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icp->sid=sid;
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icp->default_opts.OptionsSize=IP_OPTS_UNKNOWN;
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return (HANDLE)icp;
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}
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/***********************************************************************
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* IcmpCloseHandle (ICMP.@)
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*/
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BOOL WINAPI IcmpCloseHandle(HANDLE IcmpHandle)
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{
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icmp_t* icp=(icmp_t*)IcmpHandle;
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if (IcmpHandle==INVALID_HANDLE_VALUE) {
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/* FIXME: in fact win98 seems to ignore the handle value !!! */
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SetLastError(ERROR_INVALID_HANDLE);
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return FALSE;
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}
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shutdown(icp->sid,2);
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HeapFree(GetProcessHeap (), 0, icp);
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return TRUE;
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}
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/***********************************************************************
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* IcmpSendEcho (ICMP.@)
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*/
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DWORD WINAPI IcmpSendEcho(
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HANDLE IcmpHandle,
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IPAddr DestinationAddress,
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LPVOID RequestData,
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WORD RequestSize,
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PIP_OPTION_INFORMATION RequestOptions,
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LPVOID ReplyBuffer,
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DWORD ReplySize,
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DWORD Timeout
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)
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{
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icmp_t* icp=(icmp_t*)IcmpHandle;
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unsigned char* reqbuf;
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int reqsize;
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struct icmp_echo_reply* ier;
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struct ip* ip_header;
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struct icmp* icmp_header;
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char* endbuf;
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int ip_header_len;
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int maxlen;
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struct pollfd fdr;
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DWORD send_time,recv_time;
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struct sockaddr_in addr;
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unsigned int addrlen;
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unsigned short id,seq,cksum;
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int res;
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if (IcmpHandle==INVALID_HANDLE_VALUE) {
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/* FIXME: in fact win98 seems to ignore the handle value !!! */
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SetLastError(ERROR_INVALID_HANDLE);
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return 0;
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}
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if (ReplySize<sizeof(ICMP_ECHO_REPLY)+ICMP_MINLEN) {
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SetLastError(IP_BUF_TOO_SMALL);
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return 0;
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}
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/* check the request size against SO_MAX_MSG_SIZE using getsockopt */
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/* Prepare the request */
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id=getpid() & 0xFFFF;
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seq=InterlockedIncrement(&icmp_sequence) & 0xFFFF;
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reqsize=ICMP_MINLEN+RequestSize;
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reqbuf=HeapAlloc(GetProcessHeap(), 0, reqsize);
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if (reqbuf==NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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return 0;
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}
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icmp_header=(struct icmp*)reqbuf;
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icmp_header->icmp_type=ICMP_ECHO;
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icmp_header->icmp_code=0;
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icmp_header->icmp_cksum=0;
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icmp_header->icmp_id=id;
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icmp_header->icmp_seq=seq;
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memcpy(reqbuf+ICMP_MINLEN, RequestData, RequestSize);
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icmp_header->icmp_cksum=cksum=in_cksum((u_short*)reqbuf,reqsize);
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addr.sin_family=AF_INET;
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addr.sin_addr.s_addr=DestinationAddress;
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addr.sin_port=0;
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if (RequestOptions!=NULL) {
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int val;
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if (icp->default_opts.OptionsSize==IP_OPTS_UNKNOWN) {
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unsigned int len;
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/* Before we mess with the options, get the default values */
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len=sizeof(val);
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getsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,&len);
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icp->default_opts.Ttl=val;
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len=sizeof(val);
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getsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,&len);
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icp->default_opts.Tos=val;
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/* FIXME: missing: handling of IP 'flags', and all the other options */
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}
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val=RequestOptions->Ttl;
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setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
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val=RequestOptions->Tos;
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setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
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/* FIXME: missing: handling of IP 'flags', and all the other options */
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icp->default_opts.OptionsSize=IP_OPTS_CUSTOM;
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} else if (icp->default_opts.OptionsSize==IP_OPTS_CUSTOM) {
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int val;
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/* Restore the default options */
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val=icp->default_opts.Ttl;
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setsockopt(icp->sid,IPPROTO_IP,IP_TTL,(char *)&val,sizeof(val));
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val=icp->default_opts.Tos;
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setsockopt(icp->sid,IPPROTO_IP,IP_TOS,(char *)&val,sizeof(val));
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/* FIXME: missing: handling of IP 'flags', and all the other options */
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icp->default_opts.OptionsSize=IP_OPTS_DEFAULT;
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}
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/* Get ready for receiving the reply
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* Do it before we send the request to minimize the risk of introducing delays
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*/
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fdr.fd = icp->sid;
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fdr.events = POLLIN;
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addrlen=sizeof(addr);
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ier=ReplyBuffer;
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ip_header=(struct ip *) ((char *) ReplyBuffer+sizeof(ICMP_ECHO_REPLY));
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endbuf=(char *) ReplyBuffer+ReplySize;
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maxlen=ReplySize-sizeof(ICMP_ECHO_REPLY);
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/* Send the packet */
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TRACE("Sending %d bytes (RequestSize=%d) to %s\n", reqsize, RequestSize, inet_ntoa(addr.sin_addr));
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#if 0
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if (TRACE_ON(icmp)){
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unsigned char* buf=(unsigned char*)reqbuf;
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int i;
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printf("Output buffer:\n");
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for (i=0;i<reqsize;i++)
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printf("%2x,", buf[i]);
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printf("\n");
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}
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#endif
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send_time = GetTickCount();
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res=sendto(icp->sid, reqbuf, reqsize, 0, (struct sockaddr*)&addr, sizeof(addr));
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HeapFree(GetProcessHeap (), 0, reqbuf);
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if (res<0) {
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if (errno==EMSGSIZE)
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SetLastError(IP_PACKET_TOO_BIG);
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else {
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switch (errno) {
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case ENETUNREACH:
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SetLastError(IP_DEST_NET_UNREACHABLE);
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break;
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case EHOSTUNREACH:
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SetLastError(IP_DEST_HOST_UNREACHABLE);
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break;
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default:
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TRACE("unknown error: errno=%d\n",errno);
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SetLastError(IP_GENERAL_FAILURE);
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}
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}
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return 0;
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}
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/* Get the reply */
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ip_header_len=0; /* because gcc was complaining */
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while ((res=poll(&fdr,1,Timeout))>0) {
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recv_time = GetTickCount();
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res=recvfrom(icp->sid, (char*)ip_header, maxlen, 0, (struct sockaddr*)&addr,&addrlen);
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TRACE("received %d bytes from %s\n",res, inet_ntoa(addr.sin_addr));
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ier->Status=IP_REQ_TIMED_OUT;
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/* Check whether we should ignore this packet */
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if ((ip_header->ip_p==IPPROTO_ICMP) && (res>=sizeof(struct ip)+ICMP_MINLEN)) {
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ip_header_len=ip_header->ip_hl << 2;
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icmp_header=(struct icmp*)(((char*)ip_header)+ip_header_len);
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TRACE("received an ICMP packet of type,code=%d,%d\n",icmp_header->icmp_type,icmp_header->icmp_code);
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if (icmp_header->icmp_type==ICMP_ECHOREPLY) {
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if ((icmp_header->icmp_id==id) && (icmp_header->icmp_seq==seq))
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ier->Status=IP_SUCCESS;
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} else {
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switch (icmp_header->icmp_type) {
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case ICMP_UNREACH:
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switch (icmp_header->icmp_code) {
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case ICMP_UNREACH_HOST:
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#ifdef ICMP_UNREACH_HOST_UNKNOWN
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case ICMP_UNREACH_HOST_UNKNOWN:
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#endif
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#ifdef ICMP_UNREACH_ISOLATED
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case ICMP_UNREACH_ISOLATED:
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#endif
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#ifdef ICMP_UNREACH_HOST_PROHIB
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case ICMP_UNREACH_HOST_PROHIB:
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#endif
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#ifdef ICMP_UNREACH_TOSHOST
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case ICMP_UNREACH_TOSHOST:
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#endif
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ier->Status=IP_DEST_HOST_UNREACHABLE;
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break;
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case ICMP_UNREACH_PORT:
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ier->Status=IP_DEST_PORT_UNREACHABLE;
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break;
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case ICMP_UNREACH_PROTOCOL:
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ier->Status=IP_DEST_PROT_UNREACHABLE;
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break;
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case ICMP_UNREACH_SRCFAIL:
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ier->Status=IP_BAD_ROUTE;
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break;
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default:
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ier->Status=IP_DEST_NET_UNREACHABLE;
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}
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break;
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case ICMP_TIMXCEED:
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if (icmp_header->icmp_code==ICMP_TIMXCEED_REASS)
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ier->Status=IP_TTL_EXPIRED_REASSEM;
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else
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ier->Status=IP_TTL_EXPIRED_TRANSIT;
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break;
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case ICMP_PARAMPROB:
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ier->Status=IP_PARAM_PROBLEM;
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break;
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case ICMP_SOURCEQUENCH:
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ier->Status=IP_SOURCE_QUENCH;
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break;
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}
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if (ier->Status!=IP_REQ_TIMED_OUT) {
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struct ip* rep_ip_header;
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struct icmp* rep_icmp_header;
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/* The ICMP header size of all the packets we accept is the same */
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rep_ip_header=(struct ip*)(((char*)icmp_header)+ICMP_MINLEN);
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rep_icmp_header=(struct icmp*)(((char*)rep_ip_header)+(rep_ip_header->ip_hl << 2));
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/* Make sure that this is really a reply to our packet */
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if (ip_header_len+ICMP_MINLEN+(rep_ip_header->ip_hl << 2)+ICMP_MINLEN>ip_header->ip_len) {
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ier->Status=IP_REQ_TIMED_OUT;
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} else if ((rep_icmp_header->icmp_type!=ICMP_ECHO) ||
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(rep_icmp_header->icmp_code!=0) ||
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(rep_icmp_header->icmp_id!=id) ||
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/* windows doesn't check this checksum, else tracert */
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/* behind a Linux 2.2 masquerading firewall would fail*/
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/* (rep_icmp_header->icmp_cksum!=cksum) || */
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(rep_icmp_header->icmp_seq!=seq)) {
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/* This was not a reply to one of our packets after all */
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TRACE("skipping type,code=%d,%d id,seq=%d,%d cksum=%d\n",
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rep_icmp_header->icmp_type,rep_icmp_header->icmp_code,
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rep_icmp_header->icmp_id,rep_icmp_header->icmp_seq,
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rep_icmp_header->icmp_cksum);
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TRACE("expected type,code=8,0 id,seq=%d,%d cksum=%d\n",
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id,seq,
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cksum);
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ier->Status=IP_REQ_TIMED_OUT;
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}
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}
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}
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}
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if (ier->Status==IP_REQ_TIMED_OUT) {
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/* This packet was not for us.
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* Decrease the timeout so that we don't enter an endless loop even
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* if we get flooded with ICMP packets that are not for us.
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*/
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Timeout -= (recv_time - send_time);
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if (Timeout < 0) Timeout = 0;
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continue;
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} else {
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/* This is a reply to our packet */
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memcpy(&ier->Address,&ip_header->ip_src,sizeof(IPAddr));
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/* Status is already set */
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ier->RoundTripTime= recv_time - send_time;
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ier->DataSize=res-ip_header_len-ICMP_MINLEN;
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ier->Reserved=0;
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ier->Data=endbuf-ier->DataSize;
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memmove(ier->Data,((char*)ip_header)+ip_header_len+ICMP_MINLEN,ier->DataSize);
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ier->Options.Ttl=ip_header->ip_ttl;
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ier->Options.Tos=ip_header->ip_tos;
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ier->Options.Flags=ip_header->ip_off >> 13;
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ier->Options.OptionsSize=ip_header_len-sizeof(struct ip);
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if (ier->Options.OptionsSize!=0) {
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ier->Options.OptionsData=(unsigned char *) ier->Data-ier->Options.OptionsSize;
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/* FIXME: We are supposed to rearrange the option's 'source route' data */
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memmove(ier->Options.OptionsData,((char*)ip_header)+ip_header_len,ier->Options.OptionsSize);
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endbuf=(char*)ier->Options.OptionsData;
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} else {
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ier->Options.OptionsData=NULL;
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endbuf=ier->Data;
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}
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/* Prepare for the next packet */
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ier++;
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ip_header=(struct ip*)(((char*)ip_header)+sizeof(ICMP_ECHO_REPLY));
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maxlen=endbuf-(char*)ip_header;
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/* Check out whether there is more but don't wait this time */
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Timeout=0;
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}
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}
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res=ier-(ICMP_ECHO_REPLY*)ReplyBuffer;
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if (res==0)
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SetLastError(IP_REQ_TIMED_OUT);
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TRACE("received %d replies\n",res);
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return res;
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}
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Muuss.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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