summaryrefslogtreecommitdiff
path: root/src/nu_server.c
blob: ddd555eb23e53ed8720ad8fb9f4dca79cf1a27c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
#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_header.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_COMMAND cmd,
                           SMB_HEADER *buf,
                           SMB_PARAMS *buf2,
                           SMB_BYTES  *buf3 ) {
  BYTE buf_[4] = { 0, 0, 0, 0 };
  if(!buf2 ) buf2 = (SMB_PARAMS*)buf_;
  if(!buf3 ) buf3 = (SMB_BYTES*)buf_;

  struct iovec iov[16] = { {buf , sizeof(SMB_HEADER)     },
                           {buf2, 1 + buf2->WordCount * 2},
                           {buf3, 2 + buf3->ByteCount    } };

  buf->netbios_command = cmd;
  buf->netbios_flags   = 0;
  buf->netbios_size    = htons( sizeof(SMB_HEADER)  - 4 +
                                1 + buf2->WordCount * 2 +
                                2 + buf3->ByteCount );
  buf->Flags           = 0x88;
  buf->Flags2          = 0x4001;

  if( writev( childsock, iov, 3 ) < htons( buf->netbios_size ) + 4 )
    bailout( "Write failed." );
}

static void child( ) {
  SMB_HEADER *inpacket = NULL;

  /* 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, inpacket, 4);

  while( 1 ) {
    netbios_read( &inpacket );

    if( inpacket->netbios_command != 0 )
      bailout( "Unhandled netbios command" );
    if( inpacket->Protocol != SMB_HEADER_PROTOCOL_MAGIC )
      bailout( "Protocol identifier mismatch");

    switch( inpacket->Command ) {
      case SMB_COM_NEGOTIATE:
      {
        const BYTE bytes[] = { 8,0,0x67,0x61,0x74,0x6c,0x69,0x6e,0x67,0 };
        WORD params[] = { 0x0511, 0x0000, 0x0001, 0x0001, 0x0000, 0x0100,
                          0x0000, 0x0100, 0x0000, 0x0000, 0xC049, 0x0000,
                          0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 };
        struct timeval t; gettimeofday( &t, NULL );

        *(DWORD*)&inpacket->Status   = STATUS_SUCCESS;
        params[8] = getpid(); params[9] = getppid();
        *(QWORD*)&params[12] = getnttime( &t );
        netbios_write( 0, inpacket, (SMB_PARAMS*)params, (SMB_BYTES*)bytes);
        break;
      }
/*      case SMB_COM_SESSION_SETUP_ANDX:
      {
        const BYTE bytes[] = {  19,   0, 'O', 'S',   0, 'g', 'a', 't', 'l',
                               'i', 'n', 'g',   0, 'g', 'a', 't', 'l', 'i',
                               'n', 'g',   0};
        BYTE params[] = { 4, 0, 0, 23, 0, 1, 0, 0, 0 };

      } */
      default:
      {
        fprintf( stderr, "Got message: %02X\n", inpacket->Command );
        *(DWORD*)&inpacket->Status          = 0x00400002;
        netbios_write( 0, inpacket, NULL, NULL );
        break;
      }
    }

  } /* 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 );
}