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/* mod_ntlm file: $Id: session.inc.c,v 1.2 2003/02/21 01:55:14 casz Exp $ */
/* UNIX RFCNB (RFC1001/RFC1002) NetBIOS implementation
*
* Version 1.0 Session Routines ...
*
* Copyright (C) Richard Sharpe 1996
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. This program is distributed in the hope
* that it will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details. You
* should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <malloc.h>
#include <string.h>
static int RFCNB_errno = 0;
static int RFCNB_saved_errno = 0;
#define RFCNB_ERRNO
#include "std-includes.h"
#include <netinet/tcp.h>
#include "rfcnb-priv.h"
#include "rfcnb-util.h"
/* Set up a session with a remote name. We are passed Called_Name as a
* string which we convert to a NetBIOS name, ie space terminated, up to
* 16 characters only if we need to. If Called_Address is not empty, then
* we use it to connect to the remote end, but put in Called_Name ...
* Called Address can be a DNS based name, or a TCP/IP address ... */
static void *
RFCNB_Call(char *Called_Name, char *Calling_Name, char *Called_Address,
int port)
{
struct RFCNB_Con *con;
struct in_addr Dest_IP;
int Client;
BOOL redirect;
struct redirect_addr *redir_addr;
char *Service_Address;
/* Now, we really should look up the port in /etc/services ... */
if (port == 0)
port = RFCNB_Default_Port;
/* Create a connection structure first */
if ((con = (struct RFCNB_Con *) malloc(
sizeof(struct RFCNB_Con))) == NULL) {
/* Error in size */
RFCNB_errno = RFCNBE_NoSpace;
RFCNB_saved_errno = errno;
return NULL;
}
con->fd = -0; /* no descriptor yet */
con->rfc_errno = 0; /* no error yet */
con->timeout = 0; /* no timeout */
con->redirects = 0;
con->redirect_list = NULL; /* Fix bug still in version 0.50 */
/* Resolve that name into an IP address */
Service_Address = Called_Name;
if (strcmp(Called_Address, "") != 0)
Service_Address = Called_Address;
if ((errno = RFCNB_Name_To_IP(Service_Address, &Dest_IP)) < 0) {
/* Error */
/* No need to modify RFCNB_errno as it was done by
* RFCNB_Name_To_IP */
return NULL;
}
/* Now connect to the remote end */
redirect = TRUE; /* Fudge this one so we go once through */
while (redirect) { /* Connect and get session info etc */
redirect = FALSE; /* Assume all OK */
/* Build the redirect info. First one is first addr called */
/* And tack it onto the list of addresses we called */
if ((redir_addr = (struct redirect_addr *) malloc(
sizeof(struct redirect_addr))) == NULL) {
/* Could not get space */
RFCNB_errno = RFCNBE_NoSpace;
RFCNB_saved_errno = errno;
return (NULL);
}
memcpy((char *) &(redir_addr->ip_addr),
(char *) &Dest_IP, sizeof(Dest_IP));
redir_addr->port = port;
redir_addr->next = NULL;
if (con->redirect_list == NULL) { /* Stick on head */
con->redirect_list = con->last_addr = redir_addr;
} else {
con->last_addr->next = redir_addr;
con->last_addr = redir_addr;
}
/* Now, make that connection */
if ((Client = RFCNB_IP_Connect(Dest_IP, port)) < 0) { /* Error */
/* No need to modify RFCNB_errno as it was done by
* RFCNB_IP_Connect */
return NULL;
}
con->fd = Client;
/* Now send and handle the RFCNB session request */
/* If we get a redirect, we will comeback with redirect true and
* a new IP address in DEST_IP */
if ((errno = RFCNB_Session_Req(con,
Called_Name,
Calling_Name,
&redirect, &Dest_IP, &port)) < 0) {
/* No need to modify RFCNB_errno as it was done by
* RFCNB_Session.. */
return NULL;
}
if (redirect) {
/* We have to close the connection, and then try again */
(con->redirects)++;
RFCNB_Close(con->fd); /* Close it */
}
}
return con;
}
/* We send a packet to the other end ... for the moment, we treat the
* data as a series of pointers to blocks of data ... we should check the
* length ... */
static int
RFCNB_Send(struct RFCNB_Con *Con_Handle, struct RFCNB_Pkt *udata, int Length)
{
struct RFCNB_Pkt *pkt;
char *hdr;
int len;
/* Plug in the header and send the data */
pkt = RFCNB_Alloc_Pkt(RFCNB_Pkt_Hdr_Len);
if (pkt == NULL) {
RFCNB_errno = RFCNBE_NoSpace;
RFCNB_saved_errno = errno;
return (RFCNBE_Bad);
}
pkt->next = udata; /* The user data we want to send */
hdr = pkt->data;
/* Following crap is for portability across multiple UNIX machines */
*(hdr + RFCNB_Pkt_Type_Offset) = RFCNB_SESSION_MESSAGE;
RFCNB_Put_Pkt_Len(hdr, Length);
#ifdef RFCNB_DEBUG
fprintf(stderr, "Sending packet: ");
#endif
if ((len = RFCNB_Put_Pkt(Con_Handle, pkt,
Length + RFCNB_Pkt_Hdr_Len)) < 0) {
/* No need to change RFCNB_errno as it was done by put_pkt ... */
return RFCNBE_Bad; /* Should be able to write that lot ... */
}
/* Now we have sent that lot, let's get rid of the RFCNB Header
* and return */
pkt->next = NULL;
RFCNB_Free_Pkt(pkt);
return len;
}
/* We pick up a message from the internet ... We have to worry about
* non-message packets ... */
static int
RFCNB_Recv(void *con_Handle, struct RFCNB_Pkt *Data, int Length)
{
struct RFCNB_Pkt *pkt;
int ret_len;
if (con_Handle == NULL) {
RFCNB_errno = RFCNBE_BadHandle;
RFCNB_saved_errno = errno;
return (RFCNBE_Bad);
}
/* Now get a packet from below. We allocate a header first */
/* Plug in the header and send the data */
pkt = RFCNB_Alloc_Pkt(RFCNB_Pkt_Hdr_Len);
if (pkt == NULL) {
RFCNB_errno = RFCNBE_NoSpace;
RFCNB_saved_errno = errno;
return (RFCNBE_Bad);
}
pkt->next = Data; /* Plug in the data portion */
if ((ret_len = RFCNB_Get_Pkt(con_Handle, pkt,
Length + RFCNB_Pkt_Hdr_Len)) < 0) {
#ifdef RFCNB_DEBUG
fprintf(stderr, "Bad packet return in RFCNB_Recv... \n");
#endif
return RFCNBE_Bad;
}
/* We should check that we go a message and not a keep alive */
pkt->next = NULL;
RFCNB_Free_Pkt(pkt);
return ret_len;
}
/* We just disconnect from the other end, as there is nothing in the
* RFCNB protocol that specifies any exchange as far as I can see*/
static int
RFCNB_Hangup(struct RFCNB_Con *con_Handle)
{
if (con_Handle != NULL) {
RFCNB_Close(con_Handle->fd); /* Could this fail? */
free(con_Handle);
}
return 0;
}
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