/* UNIX RFCNB (RFC1001/RFC1002) NetBIOS implementation Version 1.0 RFCNB Utility 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 "config.h" #include "clibrary.h" #include "portable/socket.h" #include #include "rfcnb-priv.h" #include "rfcnb-util.h" #include "rfcnb-io.h" #include "rfcnb.h" #ifndef INADDR_NONE # define INADDR_NONE -1 #endif /* Convert name and pad to 16 chars as needed */ /* Name 1 is a C string with null termination, name 2 may not be */ /* If SysName is true, then put a <00> on end, else space> */ void RFCNB_CvtPad_Name(char *name1, char *name2) { char c, c1, c2; int i, len; len = strlen(name1); for (i = 0; i < 16; i++) { if (i >= len) { c1 = 'C'; c2 = 'A'; /* CA is a space */ } else { c = name1[i]; c1 = (char)((int)c/16 + (int)'A'); c2 = (char)((int)c%16 + (int)'A'); } name2[i*2] = c1; name2[i*2+1] = c2; } name2[32] = 0; /* Put in the nll ...*/ } /* Get a packet of size n */ struct RFCNB_Pkt *RFCNB_Alloc_Pkt(int n) { RFCNB_Pkt *pkt; if ((pkt = (struct RFCNB_Pkt *)malloc(sizeof(struct RFCNB_Pkt))) == NULL) { RFCNB_errno = RFCNBE_NoSpace; RFCNB_saved_errno = errno; return(NULL); } pkt -> next = NULL; pkt -> len = n; if (n == 0) return(pkt); if ((pkt -> data = (char *)malloc(n)) == NULL) { RFCNB_errno = RFCNBE_NoSpace; RFCNB_saved_errno = errno; free(pkt); return(NULL); } return(pkt); } /* Free up a packet */ void RFCNB_Free_Pkt(struct RFCNB_Pkt *pkt) { struct RFCNB_Pkt *pkt_next; char *data_ptr; while (pkt != NULL) { pkt_next = pkt -> next; data_ptr = pkt -> data; if (data_ptr != NULL) free(data_ptr); free(pkt); pkt = pkt_next; } } /* Resolve a name into an address */ int RFCNB_Name_To_IP(char *host, struct in_addr *Dest_IP) { unsigned int addr; /* Assumes IP4, 32 bit network addresses */ struct hostent *hp; /* Use inet_addr to try to convert the address */ if ((addr = inet_addr(host)) == (unsigned int) INADDR_NONE) { /* Oh well, a good try :-) */ /* Now try a name look up with gethostbyname */ if ((hp = gethostbyname(host)) == NULL) { /* Not in DNS */ /* Try NetBIOS name lookup, how the hell do we do that? */ RFCNB_errno = RFCNBE_BadName; /* Is this right? */ RFCNB_saved_errno = errno; return(RFCNBE_Bad); } else { /* We got a name */ memcpy(Dest_IP, hp->h_addr_list[0], sizeof(struct in_addr)); } } else { /* It was an IP address */ memcpy(Dest_IP, &addr, sizeof(struct in_addr)); } return 0; } /* Disconnect the TCP connection to the server */ int RFCNB_Close(int socket) { close(socket); /* If we want to do error recovery, here is where we put it */ return 0; } /* Connect to the server specified in the IP address. Not sure how to handle socket options etc. */ int RFCNB_IP_Connect(struct in_addr Dest_IP, int port) { struct sockaddr_in Socket; int fd; /* Create a socket */ if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) { /* Handle the error */ RFCNB_errno = RFCNBE_BadSocket; RFCNB_saved_errno = errno; return(RFCNBE_Bad); } memset(&Socket, 0, sizeof(Socket)); memcpy((char *)&Socket.sin_addr, (char *)&Dest_IP, sizeof(Dest_IP)); Socket.sin_port = htons(port); Socket.sin_family = PF_INET; /* Now connect to the destination */ if (connect(fd, (struct sockaddr *)&Socket, sizeof(Socket)) < 0) { /* Error */ close(fd); RFCNB_errno = RFCNBE_ConnectFailed; RFCNB_saved_errno = errno; return(RFCNBE_Bad); } return(fd); } /* handle the details of establishing the RFCNB session with remote end */ int RFCNB_Session_Req(struct RFCNB_Con *con, char *Called_Name, char *Calling_Name, bool *redirect, struct in_addr *Dest_IP, int * port) { char *sess_pkt; /* Response packet should be no more than 9 bytes, make 16 jic */ char resp[16]; int len; struct RFCNB_Pkt *pkt, res_pkt; /* We build and send the session request, then read the response */ pkt = RFCNB_Alloc_Pkt(RFCNB_Pkt_Sess_Len); if (pkt == NULL) { return(RFCNBE_Bad); /* Leave the error that RFCNB_Alloc_Pkt gives) */ } sess_pkt = pkt -> data; /* Get pointer to packet proper */ sess_pkt[RFCNB_Pkt_Type_Offset] = RFCNB_SESSION_REQUEST; RFCNB_Put_Pkt_Len(sess_pkt, RFCNB_Pkt_Sess_Len-RFCNB_Pkt_Hdr_Len); sess_pkt[RFCNB_Pkt_N1Len_Offset] = 32; sess_pkt[RFCNB_Pkt_N2Len_Offset] = 32; RFCNB_CvtPad_Name(Called_Name, (sess_pkt + RFCNB_Pkt_Called_Offset)); RFCNB_CvtPad_Name(Calling_Name, (sess_pkt + RFCNB_Pkt_Calling_Offset)); /* Now send the packet */ if ((len = RFCNB_Put_Pkt(con, pkt, RFCNB_Pkt_Sess_Len)) < 0) { return(RFCNBE_Bad); /* Should be able to write that lot ... */ } res_pkt.data = resp; res_pkt.len = sizeof(resp); res_pkt.next = NULL; if ((len = RFCNB_Get_Pkt(con, &res_pkt, sizeof(resp))) < 0) { return(RFCNBE_Bad); } /* Now analyze the packet ... */ switch (RFCNB_Pkt_Type(resp)) { case RFCNB_SESSION_REJ: /* Didnt like us ... too bad */ /* Why did we get rejected ? */ switch (CVAL(resp,RFCNB_Pkt_Error_Offset)) { case 0x80: RFCNB_errno = RFCNBE_CallRejNLOCN; break; case 0x81: RFCNB_errno = RFCNBE_CallRejNLFCN; break; case 0x82: RFCNB_errno = RFCNBE_CallRejCNNP; break; case 0x83: RFCNB_errno = RFCNBE_CallRejInfRes; break; case 0x8F: RFCNB_errno = RFCNBE_CallRejUnSpec; break; default: RFCNB_errno = RFCNBE_ProtErr; break; } return(RFCNBE_Bad); break; case RFCNB_SESSION_ACK: /* Got what we wanted ... */ return(0); break; case RFCNB_SESSION_RETARGET: /* Go elsewhere */ *redirect = true; /* Copy port and ip addr */ memcpy(Dest_IP, (resp + RFCNB_Pkt_IP_Offset), sizeof(struct in_addr)); *port = SVAL(resp, RFCNB_Pkt_Port_Offset); return(0); break; default: /* A protocol error */ RFCNB_errno = RFCNBE_ProtErr; return(RFCNBE_Bad); break; } }