/* * Copyright (C) 1996-2024 The Squid Software Foundation and contributors * * Squid software is distributed under GPLv2+ license and includes * contributions from numerous individuals and organizations. * Please see the COPYING and CONTRIBUTORS files for details. */ /* 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 "squid.h" #include "rfcnb/rfcnb-io.h" #include "rfcnb/rfcnb-priv.h" #include "rfcnb/rfcnb-util.h" #include "rfcnb/rfcnb.h" #include "rfcnb/std-includes.h" #if HAVE_ARPA_INET_H #include #endif #if HAVE_STRING_H #include #endif const char *RFCNB_Error_Strings[] = { "RFCNBE_OK: Routine completed successfully.", "RFCNBE_NoSpace: No space available for a malloc call.", "RFCNBE_BadName: NetBIOS name could not be translated to IP address.", "RFCNBE_BadRead: Read system call returned an error. Check errno.", "RFCNBE_BadWrite: Write system call returned an error. Check errno.", "RFCNBE_ProtErr: A protocol error has occurred.", "RFCNBE_ConGone: Connection dropped during a read or write system call.", "RFCNBE_BadHandle: Bad connection handle passed.", "RFCNBE_BadSocket: Problems creating socket.", "RFCNBE_ConnectFailed: Connection failed. See errno.", "RFCNBE_CallRejNLOCN: Call rejected. Not listening on called name.", "RFCNBE_CallRejNLFCN: Call rejected. Not listening for called name.", "RFCNBE_CallRejCNNP: Call rejected. Called name not present.", "RFCNBE_CallRejInfRes: Call rejected. Name present, but insufficient resources.", "RFCNBE_CallRejUnSpec: Call rejected. Unspecified error.", "RFCNBE_BadParam: Bad parameters passed to a routine.", "RFCNBE_Timeout: IO Operation timed out ..." }; /* 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 ... */ } /* Converts an Ascii NB Name (16 chars) to an RFCNB Name (32 chars) * Uses the encoding in RFC1001. Each nibble of byte is added to 'A' * to produce the next byte in the name. * * This routine assumes that AName is 16 bytes long and that NBName has * space for 32 chars, so be careful ... */ void RFCNB_AName_To_NBName(char *AName, char *NBName) { char c, c1, c2; int i; for (i = 0; i < 16; i++) { c = AName[i]; c1 = (char) ((c >> 4) + 'A'); c2 = (char) ((c & 0xF) + 'A'); NBName[i * 2] = c1; NBName[i * 2 + 1] = c2; } NBName[32] = 0; /* Put in a null */ } /* Do the reverse of the above ... */ void RFCNB_NBName_To_AName(char *NBName, char *AName) { char c, c1, c2; int i; for (i = 0; i < 16; i++) { c1 = NBName[i * 2]; c2 = NBName[i * 2 + 1]; c = (char) (((int) c1 - (int) 'A') * 16 + ((int) c2 - (int) 'A')); AName[i] = c; } AName[i] = 0; /* Put a null on the end ... */ } /* Print a string of bytes in HEX etc */ void RFCNB_Print_Hex(FILE * fd, struct RFCNB_Pkt *pkt, int Offset, int Len) { char c1, c2, outbuf1[33]; unsigned char c; int i, j; struct RFCNB_Pkt *pkt_ptr = pkt; static char Hex_List[17] = "0123456789ABCDEF"; j = 0; /* We only want to print as much as specified in Len */ while (pkt_ptr != NULL) { for (i = 0; i < ((Len > (pkt_ptr->len) ? pkt_ptr->len : Len) - Offset); i++) { c = pkt_ptr->data[i + Offset]; c1 = Hex_List[c >> 4]; c2 = Hex_List[c & 0xF]; outbuf1[j++] = c1; outbuf1[j++] = c2; if (j == 32) { /* Print and reset */ outbuf1[j] = 0; fprintf(fd, " %s\n", outbuf1); j = 0; } } Offset = 0; Len = Len - pkt_ptr->len; /* Reduce amount by this much */ pkt_ptr = pkt_ptr->next; } /* Print last lot in the buffer ... */ if (j > 0) { outbuf1[j] = 0; fprintf(fd, " %s\n", outbuf1); } fprintf(fd, "\n"); } /* 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; } } /* Print an RFCNB packet */ void RFCNB_Print_Pkt(FILE * fd, char *dirn, struct RFCNB_Pkt *pkt, int len) { char lname[17]; /* We assume that the first fragment is the RFCNB Header */ /* We should loop through the fragments printing them out */ fprintf(fd, "RFCNB Pkt %s:", dirn); switch (RFCNB_Pkt_Type(pkt->data)) { case RFCNB_SESSION_MESSAGE: fprintf(fd, "SESSION MESSAGE: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); RFCNB_Print_Hex(fd, pkt, RFCNB_Pkt_Hdr_Len, #ifdef RFCNB_PRINT_DATA RFCNB_Pkt_Len(pkt->data) - RFCNB_Pkt_Hdr_Len); #else 40); #endif if (Prot_Print_Routine) { /* Print the rest of the packet */ Prot_Print_Routine(fd, strcmp(dirn, "sent"), pkt, RFCNB_Pkt_Hdr_Len, RFCNB_Pkt_Len(pkt->data) - RFCNB_Pkt_Hdr_Len); } break; case RFCNB_SESSION_REQUEST: fprintf(fd, "SESSION REQUEST: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); RFCNB_NBName_To_AName((char *) (pkt->data + RFCNB_Pkt_Called_Offset), lname); fprintf(fd, " Called Name: %s\n", lname); RFCNB_NBName_To_AName((char *) (pkt->data + RFCNB_Pkt_Calling_Offset), lname); fprintf(fd, " Calling Name: %s\n", lname); break; case RFCNB_SESSION_ACK: fprintf(fd, "RFCNB SESSION ACK: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); break; case RFCNB_SESSION_REJ: fprintf(fd, "RFCNB SESSION REJECT: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); if (RFCNB_Pkt_Len(pkt->data) < 1) { fprintf(fd, " Protocol Error, short Reject packet!\n"); } else { fprintf(fd, " Error = %x\n", CVAL(pkt->data, RFCNB_Pkt_Error_Offset)); } break; case RFCNB_SESSION_RETARGET: fprintf(fd, "RFCNB SESSION RETARGET: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); /* Print out the IP address etc and the port? */ break; case RFCNB_SESSION_KEEP_ALIVE: fprintf(fd, "RFCNB SESSION KEEP ALIVE: Length = %i\n", RFCNB_Pkt_Len(pkt->data)); break; default: break; } } /* Resolve a name into an address */ int RFCNB_Name_To_IP(char *host, struct in_addr *Dest_IP) { 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)) == 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((void *) Dest_IP, (void *) hp->h_addr_list[0], sizeof(struct in_addr)); } } else { /* It was an IP address */ memcpy((void *) Dest_IP, (void *) &addr, sizeof(struct in_addr)); } return 0; } /* Disconnect the TCP connection to the server */ int RFCNB_Close(int fd) { close(fd); /* 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((char *) &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 ln1[16], ln2[16], n1[32], n2[32]; char resp[16]; int len; struct RFCNB_Pkt *pkt, res_pkt; int result = 0; /* 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 */ #ifdef RFCNB_DEBUG fprintf(stderr, "Sending packet: "); #endif if ((len = RFCNB_Put_Pkt(con, pkt, RFCNB_Pkt_Sess_Len)) < 0) { RFCNB_Free_Pkt(pkt); return (RFCNBE_Bad); /* Should be able to write that lot ... */ } #ifdef RFCNB_DEBUG fprintf(stderr, "Getting packet.\n"); #endif res_pkt.data = resp; res_pkt.len = sizeof(resp); res_pkt.next = NULL; if ((len = RFCNB_Get_Pkt(con, &res_pkt, sizeof(resp))) < 0) { RFCNB_Free_Pkt(pkt); return (RFCNBE_Bad); } /* Now analyze the packet ... */ switch (RFCNB_Pkt_Type(resp)) { case RFCNB_SESSION_REJ: /* Didn't 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; } result = (RFCNBE_Bad); break; case RFCNB_SESSION_ACK: /* Got what we wanted ... */ result = (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); result = (0); break; default: /* A protocol error */ RFCNB_errno = RFCNBE_ProtErr; result = (RFCNBE_Bad); break; } RFCNB_Free_Pkt(pkt); return result; }