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#include <time.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include "nu_server.h"
static void bailout( char *reason );
static void sigint( int reason ) { bailout( "User interrupt." ); }
static mainsock = -1;
static childsock = -1;
static QWORD getnttime( struct timeval *t ) {
return 10000000ll * ( t->tv_sec + 11644473600ll ) + t->tv_usec * 10ll;
}
static void netbios_read( SMB_HEADER **buf) {
DWORD bytes;
ssize_t bytestoread;
if( read( childsock, &bytes, 4) < 4 )
bailout( "Short read." );
bytestoread = htons(bytes>>16);
if( (*buf = (SMB_HEADER*)realloc( *buf, 4 + bytestoread )) == NULL)
bailout( "Out of memory.");
*(DWORD*)*buf = bytes;
if( read( childsock, ((BYTE*)*buf) + 4, bytestoread) != bytestoread )
bailout( "Short read." );
}
static void netbios_write( SMB_HEADER *buf,
SMB_DATA *data,
int datacount ) {
struct iovec iov[1 + 2 * SMB_MAXREQUESTS] = { {buf , sizeof(SMB_HEADER) } };
int i, sizeout = sizeof( SMB_HEADER );
for( i=0; i < datacount; ++i )
iov[1+2*i].iov_base = data[i].params,
sizeout += iov[1+2*i].iov_len = 1 + data[i].params->WordCount * 2,
iov[2+2*i].iov_base = data[i].bytes,
sizeout += iov[2+2*i].iov_len = 2 + data[i].bytes->ByteCount;
buf->netbios_command = buf->netbios_flags = 0;
buf->netbios_size = htons( sizeout - 4 );
buf->Flags = 0x88;
buf->Flags2 = 0x4001;
if( writev( childsock, iov, 1 + 2 * datacount ) < sizeout )
bailout( "Write failed." );
}
static const BYTE SMB_COM_NEGOTIATE_bytes[] = { 8,0,0x67,0x61,0x74,0x6c,0x69,0x6e,0x67,0 };
static WORD SMB_COM_NEGOTIATE_params[] = {
0x0511, 0x0000, 0x0001, 0x0001, 0x0000, 0x0100, 0x0000, 0x0100, 0x0000,
0x0000, 0xC049, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 };
static SMB_STATUS handle_SMB_COM_NEGOTIATE( SMB_HEADER *header, SMB_DATA *data ) {
struct timeval t; gettimeofday( &t, NULL );
SMB_COM_NEGOTIATE_params[8] = getpid();
SMB_COM_NEGOTIATE_params[9] = getppid();
*(QWORD*)(SMB_COM_NEGOTIATE_params+12) = getnttime( &t );
data->params = (SMB_PARAMS*)SMB_COM_NEGOTIATE_params;
data->bytes = (SMB_BYTES *)SMB_COM_NEGOTIATE_bytes;
return STATUS_SUCCESS;
}
static const BYTE SMB_COM_SESSION_SETUP_ANDX_bytes[] = {
19,0,'O','S',0,'g','a','t','l','i','n','g',0,'g','a','t','l','i','n','g',0};
static BYTE SMB_COM_SESSION_SETUP_ANDX_params[] = { 4, 255, 0, 0, 0, 1, 0, 0, 0 };
static SMB_STATUS handle_SMB_COM_SESSION_SETUP_ANDX( SMB_HEADER *header, SMB_DATA *data ) {
data->params = (SMB_PARAMS*)SMB_COM_SESSION_SETUP_ANDX_params;
data->bytes = (SMB_BYTES *)SMB_COM_SESSION_SETUP_ANDX_bytes;
return STATUS_SUCCESS;
}
static const BYTE SMB_COM_TREE_CONNECT_ANDX_bytes[] = { 8, 0, 'I', 'P', 'C', 0, 'I', 'P', 'C', 0 };
static BYTE SMB_COM_TREE_CONNECT_ANDX_params[] = { 3, 255, 0, 0, 0, 0, 0 };
static SMB_STATUS handle_SMB_COM_TREE_CONNECT_ANDX( SMB_HEADER *header, SMB_DATA *data ){
data->params = (SMB_PARAMS*)SMB_COM_TREE_CONNECT_ANDX_params;
data->bytes = (SMB_BYTES *)SMB_COM_TREE_CONNECT_ANDX_bytes;
return STATUS_SUCCESS;
}
static int command_handler_match(const void *a, const void *b ) { return *(BYTE*)a - *(BYTE*)b; }
/* If you add command handlers, please insert them in the right position,
this list is sorted by command, for later bsearch*/
static SMB_COMMAND_HANDLER command_handler[] = {
{ SMB_COM_NEGOTIATE, 0x00, handle_SMB_COM_NEGOTIATE },
{ SMB_COM_SESSION_SETUP_ANDX, 0x01, handle_SMB_COM_SESSION_SETUP_ANDX },
{ SMB_COM_TREE_CONNECT_ANDX, 0x01, handle_SMB_COM_TREE_CONNECT_ANDX }
};
static void child( ) {
SMB_HEADER *inpacket = NULL;
DWORD netbios_ack = 0x00000082;
/* I should spare that code... */
if( mainsock != -1 ) { close( mainsock ); mainsock = -1; }
/* Try to answer first netbios packet */
netbios_read( &inpacket );
if( inpacket->netbios_command != 0x81 )
bailout( "No session request");
write( childsock, &netbios_ack, 4);
while( 1 ) {
SMB_COMMAND cmd;
SMB_DATA requests[ 1 + SMB_MAXREQUESTS ];
SMB_STATUS status = STATUS_SUCCESS;
WORD sizeout = sizeof( SMB_HEADER ) - 4;
int num_requests = 0;
netbios_read( &inpacket );
if( inpacket->netbios_command != 0 )
bailout( "Unhandled netbios command" );
if( inpacket->Protocol != SMB_HEADER_PROTOCOL_MAGIC )
bailout( "Protocol identifier mismatch");
cmd = inpacket->Command;
requests[ 0 ].params = (SMB_PARAMS*)(inpacket+1);
while( (status == STATUS_SUCCESS) && (cmd != 0xff) ) {
SMB_COMMAND_HANDLER *handler = (SMB_COMMAND_HANDLER*)bsearch( &cmd, command_handler,
sizeof(command_handler)/sizeof(*command_handler), sizeof(*command_handler), command_handler_match);
requests[ num_requests ].bytes =
(SMB_BYTES*)(((BYTE*)requests[ num_requests ].params) + *((WORD*)(requests[ num_requests ].params)) + 2);
if( handler ) {
if( handler->flags & SMB_COMMAND_FLAG_ANDX ) {
cmd = ((BYTE*)requests[ num_requests ].params)[1];
requests[ num_requests+1 ].params = (SMB_PARAMS*)(((BYTE*)inpacket) + 4 + ((WORD*)requests[ num_requests ].params)[2]);
}
/* <---------- Calling handler here -----> */
if( (status = handler->handler( inpacket, requests + num_requests )) != STATUS_SUCCESS )
cmd = 0xff;
if( handler->flags & SMB_COMMAND_FLAG_ANDX ) {
sizeout += 3 + 2 * requests[ num_requests ].params->WordCount + requests[ num_requests ].bytes->ByteCount;
((BYTE*)requests[ num_requests ].params)[1] = cmd,
((BYTE*)requests[ num_requests ].params)[3] = sizeout & 255,
((BYTE*)requests[ num_requests ].params)[4] = sizeout >> 8;
} else
cmd = 0xff;
num_requests++;
} else {
if( num_requests )
((BYTE*)requests[ num_requests-1 ].params)[1] = 0xff;
status = 0x00400002;
}
}
memcpy( inpacket->Status, &status, 4 ); /* not aligned, maybe we might do a store DWORD on x86 */
netbios_write( inpacket, requests, num_requests );
} /* End main loop */
}
int main() {
struct sockaddr_in sa;
int l=1;
signal( SIGINT, sigint);
bzero( &sa, sizeof( sa));
sa.sin_family = PF_INET;
sa.sin_port = htons( 139 );
sa.sin_addr.s_addr = INADDR_ANY;
if( ( mainsock = socket( PF_INET, SOCK_STREAM, 0) ) == -1)
bailout( "Could not open socket");
#ifdef SO_REUSEPORT
setsockopt( mainsock, SOL_SOCKET, SO_REUSEPORT, &l, sizeof(l));
#else
setsockopt( mainsock, SOL_SOCKET, SO_REUSEADDR, &l, sizeof(l));
#endif
if( bind( mainsock, (struct sockaddr *)&sa, sizeof( sa)) != 0)
bailout( "Could not bind socket");
if( listen( mainsock, 1024) != 0 )
bailout( "Could not make socket listen");
while( 1 ) {
struct sockaddr otherend;
int size = sizeof( otherend );
if( ( childsock = accept( mainsock, &otherend, &size) ) == -1)
bailout( "Socket Broke.");
if (!fork()) child( );
}
}
/* Graceful exit. */
static void bailout( char *reason) {
fputs( reason, stderr);
fputs( "\nCleaning up.\n", stderr);
if( mainsock != -1 )
close( mainsock );
if( childsock != -1 ) {
shutdown( childsock, SHUT_RDWR);
close( childsock );
}
exit( 0 );
}
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