hello list:
i am learing smb protocol. i lookup NBT SESSION REQUEST PACKET from rfc
1002.
SESSION REQUEST PACKET
1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TYPE | FLAGS | LENGTH |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
/ CALLED NAME /
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
/ CALLING NAME /
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
i have a program to send this packet to windows-base host, but i cannot
properly send this packet. the result is the following by tcpdump.
>>> NBT Session Packet
NBT Session Request
Flags=0x0
Length=64 (0x40)
Destination= NameType=0x00 (Workstation)
Source >>> NBT Session Packet
NBT SessionReject
Flags=0x0
Length=1 (0x1)
Reason=0x8F
Unspecified error 0x8F
why is the Destination field empty??
what is CALLED NAME ????
/***************************************************************************/
#include <iostream.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
struct NBT_Session_Header
{
unsigned char type;
unsigned char flags;
unsigned short length;
};
struct NBT_NAME
{
char name[32];
};
struct NBT_Request
{
struct NBT_Session_Header NBTSessionHeader;
NBT_NAME called;
NBT_NAME calling;
};
int connectHost(const char* szHost, int iPort);
int sendNBT(void* data, size_t count, int socketid);
bool getnetbiosname(char* netbiosname, const char* hostname, unsigned char
type);
//Main function
int main(int argc, char *argv[])
{
int socketid = 0;
if((socketid = connectHost("192.168.2.65", 139)) == -1)
cout << "Connect host error" << endl;
NBT_Request request;
request.NBTSessionHeader.type = 0x81;
request.NBTSessionHeader.flags = 0x0;
request.NBTSessionHeader.length = htons(0x40);
getnetbiosname(request.called.name, "0", 0x20);
getnetbiosname(request.calling.name, "0", 0x00);
cout << sizeof(NBT_Request) << endl;
sendNBT(&request, sizeof(NBT_Request), socketid);
cout << "Operate finished." << endl;
return 0;
}
int connectHost(const char* szHost, int iPort)
{
//Judge if parameter is avalible
if((szHost == 0) || (iPort <= 0))
return -1;
int socketid = 0; //identify of socket
//Initial a tcp socket and get identify of socket
socketid = socket(AF_INET, SOCK_STREAM, 0);
if(socketid == -1)
cout << "Scocket error." << endl;
else
cout << "Socket is " << socketid << endl;
//Get name by ip address of host
struct hostent* host;
if((host = gethostbyname(szHost)) != NULL)
cout << "Get host name is " << host->h_name
<< endl;
else
{
cout << "Get host name failed." << endl;
return -1;
}
//Connect port of host what want to connect
struct sockaddr_in sockaddr;
sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(iPort);
sockaddr.sin_addr = *((struct in_addr*)host->h_addr);
if(connect(socketid, (struct sockaddr*)&sockaddr, sizeof(struct sockaddr))
== -1)
{
cout << "Connect failed." << endl;
return -1;
}
else
cout << "Connect succeed." << endl;
return socketid;
}
int sendNBT(void* data, size_t count, int socketid)
{
int num;
//htonl
num = send(socketid, data, count, 0);
if(num == -1)
cout << "Send failed." << errno << endl;
else
cout << "Send succeed." << endl;
return num;
}
bool getnetbiosname(char* netbiosname, const char* hostname, unsigned char type)
{
if(strlen(hostname) >= 16)
return false;
char src[16];
memset(src, ' ', 16);
memcpy(src, hostname, strlen(hostname));
src[15] = type;
int i;
for(i = 0; i < 16; i++)
{
netbiosname[i*2] = ((src[i]&0xf0)>>4) + 0x41;
netbiosname[i*2 + 1] = (src[i]&0x0f) + 0x41;
}
return true;
}
/***************************************************************************/
Thanks in advance,
liqian
