/* 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. */ int RFCNB_errno = 0; int RFCNB_saved_errno = 0; #define RFCNB_ERRNO #include "std-includes.h" #include #include "rfcnb-priv.h" #include "rfcnb-util.h" int RFCNB_Stats[RFCNB_MAX_STATS]; void (*Prot_Print_Routine)() = NULL; /* Pointer to print routine */ /* 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 ... */ 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 -> err = 0; /* no error yet */ con -> timeout = 0; /* no timeout */ con -> redirects = 0; /* Resolve that name into an IP address */ Service_Address = Called_Name; if (strcmp(Called_Address, "") != 0) { /* If the Called Address = "" */ 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 ... */ 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 ... */ int RFCNB_Recv(void *con_Handle, struct RFCNB_Pkt *Data, int Length) { struct RFCNB_Pkt *pkt; struct RFCNB_Hdr *hdr; 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 */ 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; } /* Set TCP_NODELAY on the socket */ int RFCNB_Set_Sock_NoDelay(struct RFCNB_Con *con_Handle, BOOL yn) { return(setsockopt(con_Handle -> fd, IPPROTO_TCP, TCP_NODELAY, (char *)&yn, sizeof(yn))); } /* Listen for a connection on a port???, when */ /* the connection comes in, we return with the connection */ void *RFCNB_Listen() { } /* Pick up the last error response as a string, hmmm, this routine should */ /* have been different ... */ void RFCNB_Get_Error(char *buffer, int buf_len) { if (RFCNB_saved_errno <= 0) { sprintf(buffer, "%s", RFCNB_Error_Strings[RFCNB_errno]); } else { sprintf(buffer, "%s\n\terrno:%s", RFCNB_Error_Strings[RFCNB_errno], strerror(RFCNB_saved_errno)); } } /* Pick up the last error response and returns as a code */ int RFCNB_Get_Last_Error() { return(RFCNB_errno); } /* Pick up saved errno as well */ int RFCNB_Get_Last_Errno() { return(RFCNB_saved_errno); } /* Pick up the last error response and return in string ... */ int RFCNB_Get_Error_Msg(int code, char *msg_buf, int len) { strncpy(msg_buf, RFCNB_Error_Strings[abs(code)], len); } /* Register a higher level protocol print routine */ void RFCNB_Register_Print_Routine(void (*fn)()) { Prot_Print_Routine = fn; }