Attachment 18006 Details for Bug 15436 – fake smb server that returns a bogus level to smbclient -L

fake smb server that returns a bogus level to smbclient -L

smc28b.c (text/x-csrc), 18.82 KB, created by Robert Morris on 2023-07-28 12:11:22 UTC

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Creator: Robert Morris

Created: 2023-07-28 12:11:22 UTC

Size: 18.82 KB

patch

obsolete

>#include <stdio.h>
>#include <string.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <sys/socket.h>
>#include <sys/time.h>
>#include <sys/types.h>
>#include <sys/ioctl.h>
>#include <netinet/in.h>
>#include <sys/wait.h>
>#include <sys/resource.h>
>#include <arpa/inet.h>
>#include <assert.h>
>#include <ctype.h>
>#include <fcntl.h>
>#include <signal.h>
>
>unsigned char session_id[8];
>
>int sym_started = 0;
>
>static inline unsigned long symx() {
>  sym_started = 1;
>  return 0;
>}
>
>int s = -1;
>
>unsigned char ibuf[2048];
>
>int
>readn(void *bufx, int n)
>{
>  char *buf = bufx;
>  while(n > 0){
>    int cc = read(s, buf, n);
>    if(cc <= 0)
>      return -1;
>    n -= cc;
>    buf += cc;
>  }
>  return 0;
>}
>
>int
>readmsg(void *bufx)
>{
>  unsigned char *buf = bufx;
>  if(readn(buf, 4) < 0)
>    return -1;
>  int n = (buf[2] << 8) | buf[3];
>  if(readn(buf+4, n) < 0)
>    return -1;
>  return n + 4;
>}
>
>int
>header(char *buf, int command, int do_sym)
>{
>  int ii = 0;
>
>  unsigned int status = 0;
>  if(do_sym)
>    status ^= symx();
>  unsigned int flags = 1; // 1=REDIRECT
>  if(do_sym)
>    flags ^= symx();
>
>  // SMB-over-TCP 4-byte header
>  buf[ii++] = 0; // must be zero
>  buf[ii++] = 0; // high byte of len
>  *(short*)(buf+ii) = htons(sizeof(buf)-4); // non-inclusive len, filled later
>  ii += 2;
>  
>  // SMB2 SYNC Packet Header, MS-SMB2 2.2.1.2
>  buf[ii++] = 0xfe;
>  buf[ii++] = 'S';
>  buf[ii++] = 'M';
>  buf[ii++] = 'B';
>  *(short*)(buf+ii) = 64; // StructureSize (of SMB2 header)
>  ii += 2;
>  *(short*)(buf+ii) = 0; // CreditCharge
>  ii += 2;
>  *(int*)(buf+ii) = status; // Status
>  ii += 4;
>  *(short*)(buf+ii) = command;
>  ii += 2;
>  *(short*)(buf+ii) = 6; // CreditRequest
>  ii += 2;
>  *(int*)(buf+ii) = flags; // Flags 
>  ii += 4;
>  *(int*)(buf+ii) = 0; // NextCommand
>  ii += 4;
>  static unsigned long long seq = 0;
>  *(long long *)(buf+ii) = seq++; // MessageId
>  ii += 8;
>  *(int*)(buf+ii) = 0; // Reserved
>  ii += 4;
>  *(int*)(buf+ii) = 0; // TreeId
>  ii += 4;
>  memcpy(buf+ii, session_id, 8); // SessionId
>  ii += 8;
>  memset(buf+ii, 'd', 16); // Signature
>  ii += 16;
>  
>  return ii;
>}
>
>void
>negotiate(int do_sym)
>{
>  // SMB2 NEGOTIATE, MS-SMB2 2.2.3
>  char buf[128+64];
>  memset(buf, 1, sizeof(buf));
>
>  int ii = header(buf, 0x0000, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 65; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = 0; // SecurityMode
>  ii += 2;
>  *(short*)(buf+ii) = 0x0311; // DialectRevision
>  ii += 2;
>  *(short*)(buf+ii) = 1; // NegotiateContextCount
>  ii += 2;
>  ii += 16; // ServerGuid from MS-DTYP
>  *(int*)(buf+ii) = 0x3e; // Capabilities
>  ii += 4;
>  *(int*)(buf+ii) = 8192; // MaxTransactSize
>  ii += 4;
>  *(int*)(buf+ii) = 8192; // MaxReadSize
>  ii += 4;
>  *(int*)(buf+ii) = 8192; // MaxWriteSize
>  ii += 4;
>  *(long long *)(buf+ii) = 1; // SystemTime
>  ii += 8;
>  *(long long *)(buf+ii) = 1; // ServerStartTime
>  ii += 8;
>  *(short*)(buf+ii) = 0; // SecurityBufferOffset
>  ii += 2;
>  *(short*)(buf+ii) = 0; // SecurityBufferLength
>  ii += 2;
>  int context_offset_i = ii;
>  *(int*)(buf+ii) = 0; // NegotiateContextOffset
>  ii += 4;
>
>  // SecurityBuffer
>
>  while((ii - 4) % 8)
>    ii++;
>
>  // NegotiateContextList
>  *(int*)(buf+context_offset_i) = ii - 4; // NegotiateContextOffset
>  
>  {
>    *(short*)(buf+ii) = 0x0001; // SMB2_PREAUTH_INTEGRITY_CAPABILITIES
>    ii += 2;
>    int data_length_i = ii;
>    *(short*)(buf+ii) = 0; // DataLength
>    ii += 2;
>    *(int*)(buf+ii) = 0; // Reserved
>    ii += 4;
>    int data_field_i = ii;
>    *(short*)(buf+ii) = 1; // HashAlgorithmCount
>    ii += 2;
>    *(short*)(buf+ii) = 2; // SaltLength
>    ii += 2;
>    *(short*)(buf+ii) = 1; // SHA-512
>    ii += 2;
>    *(short*)(buf+ii) = 1; // Salt
>    ii += 2;
>    *(short*)(buf+data_length_i) = ii - data_field_i;
>  }
>  
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("negotiate writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>void
>setup(int do_sym)
>{
>  // SMB2 SESSION_SETUP, MS-SMB2 2.2.6
>  char buf[128+64];
>  memset(buf, 1, sizeof(buf));
>
>  session_id[7] = 1;
>
>  int ii = header(buf, 0x0001, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 9; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = 1; // SessionFlags, 1=guest
>  ii += 2;
>  *(short*)(buf+ii) = (ii - 4 + 4); // SecurityBufferOffset
>  ii += 2;
>  *(short*)(buf+ii) = 16; // SecurityBufferLength
>  ii += 2;
>
>  memcpy(buf+ii, "NTLMSSP", 8);
>  
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("setup writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>void
>tree_connect(int do_sym)
>{
>  // SMB2 TREE_CONNECT, MS-SMB2 2.2.10
>  char buf[128+64];
>  memset(buf, 1, sizeof(buf));
>
>  int ii = header(buf, 0x0003, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 16; // StructureSize
>  ii += 2;
>  buf[ii++] = 0x02; // ShareType, 1=disk, 2=pipe, 3=print
>  buf[ii++] = 0; // Reserved
>  *(int*)(buf+ii) = 0x33; // ShareFlags
>  ii += 4;
>  // *(int*)(buf+ii) = 0x1f8; // Capabilities
>  *(int*)(buf+ii) = 0xfff8; // Capabilities
>  ii += 4;
>  *(int*)(buf+ii) = 0xffffffff; // MaximalAccess
>  ii += 4;
>  
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("tree_connect writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>void
>smb_ioctl(int do_sym)
>{
>  // SMB2 IOCTL, MS-SMB2 2.2.32
>  char buf[256];
>  memset(buf, 0x99, sizeof(buf));
>
>  int ii = header(buf, 0x000b, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 49; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = 0; // Reserved
>  ii += 2;
>  *(int*)(buf+ii) = 0x0011c017; // CtlCode
>  ii += 4;
>  memset(buf+ii, 0xff, 16);
>  ii += 16; // FileId
>  *(int*)(buf+ii) = (ii-4+24); // InputOffset
>  ii += 4;
>  *(int*)(buf+ii) = 0; // InputCount
>  ii += 4;
>  *(int*)(buf+ii) = (ii-4+16); // OutputOffset
>  ii += 4;
>  int count_i = ii;
>  *(int*)(buf+ii) = 128; // OutputCount
>  ii += 4;
>  *(int*)(buf+ii) = 0; // Flags
>  ii += 4;
>  *(int*)(buf+ii) = 0; // Reserved
>  ii += 4;
>
>  int ostart = ii;
>
>#if 0
>  *(short*)(buf+ii) = 2; // consumed_ucs
>  ii += 2;
>  *(short*)(buf+ii) = 0; // num_referrals
>  ii += 2;
>  buf[ii++] = 0;
>  buf[ii++] = 'x';
>#endif
>
>#if 1
>  // DCE RPC connection-oriented reply.
>  buf[ii++] = 5; // rpc_vers
>  buf[ii++] = 0; // rpc_vers_minor
>  buf[ii++] = 12; // ptype, 12=bind ack
>  buf[ii++] = 3; // flags, first and last fragment
>  buf[ii++] = 0x10; // packed_drep?
>  buf[ii++] = 0x00; // packed_drep?
>  buf[ii++] = 0x00; // packed_drep?
>  buf[ii++] = 0x00; // packed_drep?
>  *(short*)(buf+ii) = 64; // frag_length
>  ii += 2;
>  *(short*)(buf+ii) = 0; // auth_length
>  ii += 2;
>  *(int*)(buf+ii) = 1; // call_id, XXX
>  ii += 4;
>
>  // bind_ack reply
>  *(short*)(buf+ii) = 1024; // max_xmit_frag
>  ii += 2;
>  *(short*)(buf+ii) = 1024; // max_recv_frag
>  ii += 2;
>  *(int*)(buf+ii) = 1; // assoc_group_id
>  ii += 4;
>  *(short*)(buf+ii) = 0; // port_any_t
>  ii += 2;
>  while(ii % 4)
>    buf[ii++] = 0;
>  // p_result_list_t
>  buf[ii++] = 1; // n_results
>  buf[ii++] = 0; // reserved
>  *(short*)(buf+ii) = 0; // reserved
>  ii += 2;
>  // p_result_t
>  *(short*)(buf+ii) = 0; // result
>  ii += 2;
>  *(short*)(buf+ii) = 0; // reason
>  ii += 2;
>  // p_syntax_id_t
>  unsigned char uuid[] = {
>    0x04, 0x5d, 0x88, 0x8a, 0xeb, 0x1c, 0xc9, 0x11, 0x9f,
>    0xe8, 0x08, 0x00, 0x2b, 0x10, 0x48, 0x60,
>  };
>  memcpy(buf+ii, uuid, sizeof(uuid));
>  ii += sizeof(uuid);
>  *(int*)(buf+ii) = 2; // if_version
>  ii += 4;
>#endif
>
>  *(int*)(buf+count_i) = ii - ostart;
>
>  int ii1 = ii;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii1; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("ioctl writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>void
>smb_create(int do_sym)
>{
>  // SMB2 CREATE, MS-SMB2 2.2.14
>  char buf[128+64];
>  memset(buf, 0xff, sizeof(buf));
>
>  int ii = header(buf, 0x0005, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 89; // StructureSize
>  ii += 2;
>  buf[ii++] = 0; // OplockLevel
>  buf[ii++] = 0; // Flags
>  *(int*)(buf+ii) = 0; // CreateAction
>  ii += 4;
>  *(long long*)(buf+ii) = 1; // CreationTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastAccessTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastWriteTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // ChangeTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // AllocationSize
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // EndofFile
>  ii += 8;
>  // 0x10 directory
>  *(int*)(buf+ii) = 0x10; // FileAttributes
>  ii += 4;
>  *(int*)(buf+ii) = 0; // Reserved2
>  ii += 4;
>  ii += 16; // FileId
>  *(int*)(buf+ii) = (ii - 4 + 8); // CreateContextsOffset
>  ii += 4;
>  *(int*)(buf+ii) = 32; // CreateContextsLength
>  ii += 4;
>
>  // one context
>  *(int*)(buf+ii) = 0; // Next
>  ii += 4;
>  *(short*)(buf+ii) = 16; // NameOffset
>  ii += 2;
>  *(short*)(buf+ii) = 4; // NameLength
>  ii += 2;
>  *(short*)(buf+ii) = 0; // Reserved
>  ii += 2;
>  *(short*)(buf+ii) = 24; // DataOffset
>  ii += 2;
>  *(int*)(buf+ii) = 8; // DataLength
>  ii += 4;
>  
>
>  // SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE
>  *(int*)(buf+ii) = 0x4d784163; // Name
>  ii += 4;
>  ii += 4; // pad
>  *(int*)(buf+ii) = 0; // QueryStatus
>  ii += 4;
>  *(int*)(buf+ii) = 0xffffffff; // MaximalAccess
>  ii += 4;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("create writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>void
>smb_close(int do_sym)
>{
>  char buf[128+64];
>  memset(buf, 0xff, sizeof(buf));
>
>  int ii = header(buf, 0x0006, do_sym>1);
>  int ii0 = ii;
>  
>  *(short*)(buf+ii) = 60; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = 0; // Flags
>  ii += 2;
>  *(int*)(buf+ii) = 0; // Reserved
>  ii += 4;
>  *(long long*)(buf+ii) = 1; // CreationTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastAccessTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastWriteTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // ChangeTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // AllocationSize
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // EndofFile
>  ii += 8;
>  // 0x10 directory
>  *(int*)(buf+ii) = 0x10; // FileAttributes
>  ii += 4;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("close writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>  
>void
>query_directory(int any, int do_sym)
>{
>  char buf[256+128];
>  memset(buf, 0xff, sizeof(buf));
>
>  int ii = header(buf, 0x000e, do_sym>1);
>  int ii0 = ii;
>
>  if(any == 0){
>    *(int*)(buf+12) = 0x80000006; // STATUS_NO_MORE_FILES
>  }
>  
>  *(short*)(buf+ii) = 9; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = (ii - 4 + 6); // OutputBufferOffset
>  ii += 2;
>  *(int*)(buf+ii) = any ? 106 : 0; // OutputBufferLength
>  ii += 4;
>
>  // probably FileBothDirectoryInformation, MS-FSCC 2.4.8
>  *(int*)(buf+ii) = 0; // NextEntryOffset
>  ii += 4;
>  *(int*)(buf+ii) = 1; // FileIndex
>  ii += 4;
>  *(long long*)(buf+ii) = 1; // CreationTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastAccessTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastWriteTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // ChangeTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // EndofFile
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // AllocationSize
>  ii += 8;
>  // 0x10 directory
>  *(int*)(buf+ii) = 0x10; // FileAttributes
>  ii += 4;
>  *(int*)(buf+ii) = 2; // FileNameLength
>  ii += 4;
>  *(int*)(buf+ii) = 0; // EaSize
>  ii += 4;
>  buf[ii++] = 2; // ShortNameLength
>  buf[ii++] = 0; // Reserved
>  buf[ii++] = 'f'; // ShortName
>  buf[ii++] = 0;
>  ii += 22;
>  buf[ii++] = 'f'; // FileName
>  buf[ii++] = 0;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("query_directory writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>  
>void
>query_info(int do_sym)
>{
>  char buf[256+128];
>  memset(buf, 0xff, sizeof(buf));
>
>  int ii = header(buf, 0x0010, do_sym>1);
>  int ii0 = ii;
>
>  *(short*)(buf+ii) = 9; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = (ii - 4 + 6); // OutputBufferOffset
>  ii += 2;
>  *(int*)(buf+ii) = 106; // OutputBufferLength
>  ii += 4;
>
>  // probably FileBothDirectoryInformation, MS-FSCC 2.4.8
>  *(int*)(buf+ii) = 0; // NextEntryOffset
>  ii += 4;
>  *(int*)(buf+ii) = 1; // FileIndex
>  ii += 4;
>  *(long long*)(buf+ii) = 1; // CreationTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastAccessTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // LastWriteTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // ChangeTime
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // EndofFile
>  ii += 8;
>  *(long long*)(buf+ii) = 1; // AllocationSize
>  ii += 8;
>  // 0x10 directory
>  *(int*)(buf+ii) = 0x10; // FileAttributes
>  ii += 4;
>  *(int*)(buf+ii) = 2; // FileNameLength
>  ii += 4;
>  *(int*)(buf+ii) = 0; // EaSize
>  ii += 4;
>  buf[ii++] = 2; // ShortNameLength
>  buf[ii++] = 0; // Reserved
>  buf[ii++] = 'f'; // ShortName
>  buf[ii++] = 0;
>  ii += 22;
>  buf[ii++] = 'f'; // FileName
>  buf[ii++] = 0;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("query_info writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>  
>void
>smb_read(int do_sym)
>{
>  char buf[256];
>  memset(buf, 1, sizeof(buf));
>
>  int ii = header(buf, 0x0008, do_sym>1);
>  int ii0 = ii;
>
>  *(short*)(buf+ii) = 17; // StructureSize
>  ii += 2;
>  buf[ii] = ii - 4 + 14; // DataOffset
>  ii++;
>  buf[ii++] = 0; // Reserved
>  *(int*)(buf+ii) = 128; // DataLength
>  ii += 4;
>  *(int*)(buf+ii) = 0; // DataRemaining
>  ii += 4;
>  *(int*)(buf+ii) = 0; // Flags
>  ii += 4;
>
>  unsigned char data[] = {
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x05, 0x00, 0x02,
>    0x03, 0x10, 0x00, 0x00, 0x00, 0x76, 0x00, 0x00, 0x00, 0x02, 0x00,
>    0x00, 0x00, 0x00, 0x00, 0xf2, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21,
>    0x01, 0x00, 0x00, 0x21, 0x01, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
>    0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
>  };
>  memcpy(buf+ii, data, sizeof(data));
>  ii += sizeof(data);
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("read writing %d bytes\n", ii); fflush(stdout);
>
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>  
>void
>change_notify(int do_sym)
>{
>  char buf[128];
>  memset(buf, 0xff, sizeof(buf));
>
>  int ii = header(buf, 0x000f, do_sym>1);
>  int ii0 = ii;
>
>  *(short*)(buf+ii) = 9; // StructureSize
>  ii += 2;
>  *(short*)(buf+ii) = (ii - 4 + 6); // OutputBufferOffset
>  ii += 2;
>  *(int*)(buf+ii) = 14; // OutputBufferLength
>  ii += 4;
>
>  // FILE_NOTIFY_INFORMATION
>  *(int*)(buf+ii) = 0; // NextEntryOffset
>  ii += 4;
>  *(int*)(buf+ii) = 7; // Action
>  ii += 4;
>  *(int*)(buf+ii) = 2; // FileNameLength
>  ii += 4;
>  buf[ii++] = 'd';
>  buf[ii++] = 0;
>
>  assert(ii <= sizeof(buf));
>  
>  ii = sizeof(buf);
>  
>  if(do_sym){
>    for(int i = ii0; i+8 <= sizeof(buf); i += 8)
>      *(long long *)(buf+i) ^= symx();
>  }
>  
>  *(short*)(buf+2) = htons(ii-4); // non-inclusive len
>  
>  printf("change_notify writing %d bytes\n", ii); fflush(stdout);
>  
>  if(write(s, buf, ii) <= 0){
>    perror("write");
>  }
>}
>
>char *command_names[] = {
>  "NEGOTIATE",
>  "SESSION_SETUP",
>  "LOGOFF",
>  "TREE_CONNECT",
>  "TREE_DISCONNECT",
>  "CREATE",
>  "CLOSE",
>  "FLUSH",
>  "READ",
>  "WRITE",
>  "LOCK",
>  "IOCTL",
>  "CANCEL",
>  "ECHO",
>  "QUERY_DIRECTORY",
>  "CHANGE_NOTIFY",
>  "QUERY_INFO",
>  "SET_INFO",
>  "OPLOCK_BREAK",
>  "0x0012",
>};
>
>int
>main()
>{
>  signal(SIGPIPE, SIG_IGN);
>
>  struct sockaddr_in sin;
>  memset(&sin, 0, sizeof(sin));
>  sin.sin_family = AF_INET;
>  sin.sin_port = htons(445); // SMB over TCP
>
>  int ss = socket(AF_INET, SOCK_STREAM, 0);
>  int yes = 1;
>  setsockopt(ss, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
>  if(bind(ss, (struct sockaddr *)&sin, sizeof(sin)) < 0){
>    perror("bind");
>    exit(1);
>  }
>  listen(ss, 10);
>
>  socklen_t sinlen = sizeof(sin);
>  s = accept(ss, (struct sockaddr *)&sin, &sinlen);
>  if(s < 0){
>    perror("accept");
>    exit(1);
>  }
>  close(ss);
>
>  sleep(1);
>
>  unsigned int command;
>  int n;
>
>  memset(ibuf, 0, sizeof(ibuf));
>  n = readmsg(ibuf);
>  command = *(short*)(ibuf+16);
>  printf("read %d, command %d %s\n", n, command, command_names[command]);
>  negotiate(0);
>
>  memset(ibuf, 0, sizeof(ibuf));
>  n = readmsg(ibuf);
>  command = *(short*)(ibuf+16);
>  printf("read %d, command %d %s\n", n, command, command_names[command]);
>  if(command == 1){
>    setup(0);
>  }
>
>  memset(ibuf, 0, sizeof(ibuf));
>  n = readmsg(ibuf);
>  command = *(short*)(ibuf+16);
>  printf("read %d, command %d %s\n", n, command, command_names[command]);
>  if(command == 3){
>    tree_connect(0);
>  }
>
>  while(1){
>    memset(ibuf, 0, sizeof(ibuf));
>    n = readmsg(ibuf);
>    if(n < 0)
>      break;
>    command = *(short*)(ibuf+16);
>    printf("command 0x%02x %s\n", command, command_names[command]);
>    if(command == 0xb){
>      smb_ioctl(0);
>    } else if(command == 5){
>      smb_create(0);
>    } else if(command == 6){
>      smb_close(0);
>    } else if(command == 0xe){
>      static int nn = 0;
>      query_directory(nn == 0 ? 1 : 0, 0);
>      nn++;
>    } else if(command == 0x10){
>      query_info(0);
>    } else if(command == 0x08){
>      smb_read(1);
>      break;
>    } else if(command == 0x0f){
>      change_notify(1);
>      break;
>    } else {
>      break;
>    }
>  }
>  
>  sleep(1);
>  close(s);
>}

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Attachments on bug 15436: 18006