diff options
Diffstat (limited to 'source/libsmb/nmblib.c')
| -rw-r--r-- | source/libsmb/nmblib.c | 731 |
1 files changed, 0 insertions, 731 deletions
diff --git a/source/libsmb/nmblib.c b/source/libsmb/nmblib.c deleted file mode 100644 index bc967bdacb4..00000000000 --- a/source/libsmb/nmblib.c +++ /dev/null @@ -1,731 +0,0 @@ -/* - Unix SMB/Netbios implementation. - Version 1.9. - NBT netbios library routines - Copyright (C) Andrew Tridgell 1994-1997 - - 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 "includes.h" - -extern int DEBUGLEVEL; - -int num_good_sends = 0; -int num_good_receives = 0; -extern pstring scope; -extern pstring myname; -extern struct in_addr ipzero; - -static struct opcode_names { - const char *nmb_opcode_name; - int opcode; -} nmb_header_opcode_names[] = { - { "Query", 0 }, - {"Registration", 5 }, - {"Release", 6 }, - {"WACK", 7 }, - {"refresh", 8 }, - {0, -1 } -}; - -/**************************************************************************** - * Lookup a nmb opcode name. - ****************************************************************************/ - -const char *lookup_opcode_name( int opcode ) -{ - struct opcode_names *op_namep; - int i; - - for(i = 0; nmb_header_opcode_names[i].nmb_opcode_name != 0; i++) { - op_namep = &nmb_header_opcode_names[i]; - if(opcode == op_namep->opcode) - return op_namep->nmb_opcode_name; - } - return "<unknown opcode>"; -} - -/**************************************************************************** - print out a res_rec structure - ****************************************************************************/ -static void debug_nmb_res_rec(struct res_rec *res, char *hdr) -{ - int i, j; - - DEBUG(4,(" %s: nmb_name=%s rr_type=%d rr_class=%d ttl=%d\n", - hdr, - namestr(&res->rr_name), - res->rr_type, - res->rr_class, - res->ttl)); - - if (res->rdlength == 0 || res->rdata == NULL) return; - - for (i = 0; i < res->rdlength; i+= 16) - { - DEBUG(4, (" %s %3x char ", hdr, i)); - - for (j = 0; j < 16; j++) - { - unsigned char x = res->rdata[i+j]; - if (x < 32 || x > 127) x = '.'; - - if (i+j >= res->rdlength) break; - DEBUG(4, ("%c", x)); - } - - DEBUG(4, (" hex ", i)); - - for (j = 0; j < 16; j++) - { - if (i+j >= res->rdlength) break; - DEBUG(4, ("%02X", (unsigned char)res->rdata[i+j])); - } - - DEBUG(4, ("\n")); - } -} - -/**************************************************************************** - process a nmb packet - ****************************************************************************/ -void debug_nmb_packet(struct packet_struct *p) -{ - struct nmb_packet *nmb = &p->packet.nmb; - - DEBUG(4,("nmb packet from %s header: id=%d opcode=%s(%d) response=%s\n", - inet_ntoa(p->ip), - nmb->header.name_trn_id, - lookup_opcode_name(nmb->header.opcode), - nmb->header.opcode,BOOLSTR(nmb->header.response))); - DEBUG(4,(" header: flags: bcast=%s rec_avail=%s rec_des=%s trunc=%s auth=%s\n", - BOOLSTR(nmb->header.nm_flags.bcast), - BOOLSTR(nmb->header.nm_flags.recursion_available), - BOOLSTR(nmb->header.nm_flags.recursion_desired), - BOOLSTR(nmb->header.nm_flags.trunc), - BOOLSTR(nmb->header.nm_flags.authoritative))); - DEBUG(4,(" header: rcode=%d qdcount=%d ancount=%d nscount=%d arcount=%d\n", - nmb->header.rcode, - nmb->header.qdcount, - nmb->header.ancount, - nmb->header.nscount, - nmb->header.arcount)); - - if (nmb->header.qdcount) - { - DEBUG(4,(" question: q_name=%s q_type=%d q_class=%d\n", - namestr(&nmb->question.question_name), - nmb->question.question_type, - nmb->question.question_class)); - } - - if (nmb->answers && nmb->header.ancount) - { - debug_nmb_res_rec(nmb->answers,"answers"); - } - if (nmb->nsrecs && nmb->header.nscount) - { - debug_nmb_res_rec(nmb->nsrecs,"nsrecs"); - } - if (nmb->additional && nmb->header.arcount) - { - debug_nmb_res_rec(nmb->additional,"additional"); - } -} - -/******************************************************************* - handle "compressed" name pointers - ******************************************************************/ -static BOOL handle_name_ptrs(unsigned char *ubuf,int *offset,int length, - BOOL *got_pointer,int *ret) -{ - int loop_count=0; - - while ((ubuf[*offset] & 0xC0) == 0xC0) { - if (!*got_pointer) (*ret) += 2; - (*got_pointer)=True; - (*offset) = ((ubuf[*offset] & ~0xC0)<<8) | ubuf[(*offset)+1]; - if (loop_count++ == 10 || (*offset) < 0 || (*offset)>(length-2)) { - return(False); - } - } - return(True); -} - -/******************************************************************* - parse a nmb name from "compressed" format to something readable - return the space taken by the name, or 0 if the name is invalid - ******************************************************************/ -static int parse_nmb_name(char *inbuf,int offset,int length, struct nmb_name *name) -{ - int m,n=0; - unsigned char *ubuf = (unsigned char *)inbuf; - int ret = 0; - BOOL got_pointer=False; - - if (length - offset < 2) return(0); - - /* handle initial name pointers */ - if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret)) return(0); - - m = ubuf[offset]; - - if (!m) return(0); - if ((m & 0xC0) || offset+m+2 > length) return(0); - - bzero((char *)name,sizeof(*name)); - - /* the "compressed" part */ - if (!got_pointer) ret += m + 2; - offset++; - while (m) { - unsigned char c1,c2; - c1 = ubuf[offset++]-'A'; - c2 = ubuf[offset++]-'A'; - if ((c1 & 0xF0) || (c2 & 0xF0)) return(0); - name->name[n++] = (c1<<4) | c2; - m -= 2; - } - name->name[n] = 0; - - if (n==16) { - /* parse out the name type, - its always in the 16th byte of the name */ - name->name_type = name->name[15]; - - /* remove trailing spaces */ - name->name[15] = 0; - n = 14; - while (n && name->name[n]==' ') name->name[n--] = 0; - } - - /* now the domain parts (if any) */ - n = 0; - while ((m=ubuf[offset])) { - /* we can have pointers within the domain part as well */ - if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret)) return(0); - - if (!got_pointer) ret += m+1; - if (n) name->scope[n++] = '.'; - if (m+2+offset>length || n+m+1>sizeof(name->scope)) return(0); - offset++; - while (m--) name->scope[n++] = (char)ubuf[offset++]; - } - name->scope[n++] = 0; - - return(ret); -} - - -/******************************************************************* - put a compressed nmb name into a buffer. return the length of the - compressed name - - compressed names are really weird. The "compression" doubles the - size. The idea is that it also means that compressed names conform - to the doman name system. See RFC1002. - ******************************************************************/ -static int put_nmb_name(char *buf,int offset,struct nmb_name *name) -{ - int ret,m; - fstring buf1; - char *p; - - if (name->name[0] == '*') { - /* special case for wildcard name */ - bzero(buf1,20); - buf1[0] = '*'; - } else { - sprintf(buf1,"%-15.15s%c",name->name,name->name_type); - } - - buf[offset] = 0x20; - - ret = 34; - - for (m=0;m<16;m++) { - buf[offset+1+2*m] = 'A' + ((buf1[m]>>4)&0xF); - buf[offset+2+2*m] = 'A' + (buf1[m]&0xF); - } - offset += 33; - - buf[offset] = 0; - - if (name->scope[0]) { - /* XXXX this scope handling needs testing */ - ret += strlen(name->scope) + 1; - strcpy(&buf[offset+1],name->scope); - - p = &buf[offset+1]; - while ((p = strchr(p,'.'))) { - buf[offset] = PTR_DIFF(p,&buf[offset]); - offset += buf[offset]; - p = &buf[offset+1]; - } - buf[offset] = strlen(&buf[offset+1]); - } - - return(ret); -} - -/******************************************************************* - useful for debugging messages - ******************************************************************/ -char *namestr(struct nmb_name *n) -{ - static int i=0; - static fstring ret[4]; - char *p = ret[i]; - - if (!n->scope[0]) - sprintf(p,"%s(%x)",n->name,n->name_type); - else - sprintf(p,"%s(%x).%s",n->name,n->name_type,n->scope); - - i = (i+1)%4; - return(p); -} - -/******************************************************************* - allocate and parse some resource records - ******************************************************************/ -static BOOL parse_alloc_res_rec(char *inbuf,int *offset,int length, - struct res_rec **recs, int count) -{ - int i; - *recs = (struct res_rec *)malloc(sizeof(**recs)*count); - if (!*recs) return(False); - - bzero(*recs,sizeof(**recs)*count); - - for (i=0;i<count;i++) { - int l = parse_nmb_name(inbuf,*offset,length,&(*recs)[i].rr_name); - (*offset) += l; - if (!l || (*offset)+10 > length) { - free(*recs); - return(False); - } - (*recs)[i].rr_type = RSVAL(inbuf,(*offset)); - (*recs)[i].rr_class = RSVAL(inbuf,(*offset)+2); - (*recs)[i].ttl = RIVAL(inbuf,(*offset)+4); - (*recs)[i].rdlength = RSVAL(inbuf,(*offset)+8); - (*offset) += 10; - if ((*recs)[i].rdlength>sizeof((*recs)[i].rdata) || - (*offset)+(*recs)[i].rdlength > length) { - free(*recs); - return(False); - } - memcpy((*recs)[i].rdata,inbuf+(*offset),(*recs)[i].rdlength); - (*offset) += (*recs)[i].rdlength; - } - return(True); -} - -/******************************************************************* - put a resource record into a packet - ******************************************************************/ -static int put_res_rec(char *buf,int offset,struct res_rec *recs,int count) -{ - int ret=0; - int i; - - for (i=0;i<count;i++) { - int l = put_nmb_name(buf,offset,&recs[i].rr_name); - offset += l; - ret += l; - RSSVAL(buf,offset,recs[i].rr_type); - RSSVAL(buf,offset+2,recs[i].rr_class); - RSIVAL(buf,offset+4,recs[i].ttl); - RSSVAL(buf,offset+8,recs[i].rdlength); - memcpy(buf+offset+10,recs[i].rdata,recs[i].rdlength); - offset += 10+recs[i].rdlength; - ret += 10+recs[i].rdlength; - } - - return(ret); -} - -/******************************************************************* - parse a dgram packet. Return False if the packet can't be parsed - or is invalid for some reason, True otherwise - - this is documented in section 4.4.1 of RFC1002 - ******************************************************************/ -static BOOL parse_dgram(char *inbuf,int length,struct dgram_packet *dgram) -{ - int offset; - int flags; - - bzero((char *)dgram,sizeof(*dgram)); - - if (length < 14) return(False); - - dgram->header.msg_type = CVAL(inbuf,0); - flags = CVAL(inbuf,1); - dgram->header.flags.node_type = (enum node_type)((flags>>2)&3); - if (flags & 1) dgram->header.flags.more = True; - if (flags & 2) dgram->header.flags.first = True; - dgram->header.dgm_id = RSVAL(inbuf,2); - putip((char *)&dgram->header.source_ip,inbuf+4); - dgram->header.source_port = RSVAL(inbuf,8); - dgram->header.dgm_length = RSVAL(inbuf,10); - dgram->header.packet_offset = RSVAL(inbuf,12); - - offset = 14; - - if (dgram->header.msg_type == 0x10 || - dgram->header.msg_type == 0x11 || - dgram->header.msg_type == 0x12) { - offset += parse_nmb_name(inbuf,offset,length,&dgram->source_name); - offset += parse_nmb_name(inbuf,offset,length,&dgram->dest_name); - } - - if (offset >= length || (length-offset > sizeof(dgram->data))) - return(False); - - dgram->datasize = length-offset; - memcpy(dgram->data,inbuf+offset,dgram->datasize); - - return(True); -} - - -/******************************************************************* - parse a nmb packet. Return False if the packet can't be parsed - or is invalid for some reason, True otherwise - ******************************************************************/ -static BOOL parse_nmb(char *inbuf,int length,struct nmb_packet *nmb) -{ - int nm_flags,offset; - - bzero((char *)nmb,sizeof(*nmb)); - - if (length < 12) return(False); - - /* parse the header */ - nmb->header.name_trn_id = RSVAL(inbuf,0); - - DEBUG(10,("parse_nmb: packet id = %d\n", nmb->header.name_trn_id)); - - nmb->header.opcode = (CVAL(inbuf,2) >> 3) & 0xF; - nmb->header.response = ((CVAL(inbuf,2)>>7)&1)?True:False; - nm_flags = ((CVAL(inbuf,2) & 0x7) << 4) + (CVAL(inbuf,3)>>4); - nmb->header.nm_flags.bcast = (nm_flags&1)?True:False; - nmb->header.nm_flags.recursion_available = (nm_flags&8)?True:False; - nmb->header.nm_flags.recursion_desired = (nm_flags&0x10)?True:False; - nmb->header.nm_flags.trunc = (nm_flags&0x20)?True:False; - nmb->header.nm_flags.authoritative = (nm_flags&0x40)?True:False; - nmb->header.rcode = CVAL(inbuf,3) & 0xF; - nmb->header.qdcount = RSVAL(inbuf,4); - nmb->header.ancount = RSVAL(inbuf,6); - nmb->header.nscount = RSVAL(inbuf,8); - nmb->header.arcount = RSVAL(inbuf,10); - - if (nmb->header.qdcount) { - offset = parse_nmb_name(inbuf,12,length,&nmb->question.question_name); - if (!offset) return(False); - - if (length - (12+offset) < 4) return(False); - nmb->question.question_type = RSVAL(inbuf,12+offset); - nmb->question.question_class = RSVAL(inbuf,12+offset+2); - - offset += 12+4; - } else { - offset = 12; - } - - /* and any resource records */ - if (nmb->header.ancount && - !parse_alloc_res_rec(inbuf,&offset,length,&nmb->answers, - nmb->header.ancount)) - return(False); - - if (nmb->header.nscount && - !parse_alloc_res_rec(inbuf,&offset,length,&nmb->nsrecs, - nmb->header.nscount)) - return(False); - - if (nmb->header.arcount && - !parse_alloc_res_rec(inbuf,&offset,length,&nmb->additional, - nmb->header.arcount)) - return(False); - - return(True); -} - -/******************************************************************* - free up any resources associated with an nmb packet - ******************************************************************/ -void free_nmb_packet(struct nmb_packet *nmb) -{ - if (nmb->answers) free(nmb->answers); - if (nmb->nsrecs) free(nmb->nsrecs); - if (nmb->additional) free(nmb->additional); -} - -/******************************************************************* - free up any resources associated with a packet - ******************************************************************/ -void free_packet(struct packet_struct *packet) -{ - if (packet->packet_type == NMB_PACKET) - free_nmb_packet(&packet->packet.nmb); - free(packet); -} - -/******************************************************************* - read a packet from a socket and parse it, returning a packet ready - to be used or put on the queue. This assumes a UDP socket - ******************************************************************/ -struct packet_struct *read_packet(int fd,enum packet_type packet_type) -{ - extern struct in_addr lastip; - extern int lastport; - struct packet_struct *packet; - char buf[MAX_DGRAM_SIZE]; - int length; - BOOL ok=False; - - length = read_udp_socket(fd,buf,sizeof(buf)); - if (length < MIN_DGRAM_SIZE) return(NULL); - - packet = (struct packet_struct *)malloc(sizeof(*packet)); - if (!packet) return(NULL); - - packet->next = NULL; - packet->prev = NULL; - packet->ip = lastip; - packet->port = lastport; - packet->fd = fd; - packet->timestamp = time(NULL); - packet->packet_type = packet_type; - switch (packet_type) - { - case NMB_PACKET: - ok = parse_nmb(buf,length,&packet->packet.nmb); - break; - - case DGRAM_PACKET: - ok = parse_dgram(buf,length,&packet->packet.dgram); - break; - } - if (!ok) { - DEBUG(10,("parse_nmb: discarding packet id = %d\n", - packet->packet.nmb.header.name_trn_id)); - free(packet); - return(NULL); - } - - num_good_receives++; - - DEBUG(5,("%s received a packet of len %d from (%s) port %d\n", - timestring(),length,inet_ntoa(packet->ip),packet->port)); - - return(packet); -} - - -/******************************************************************* - send a udp packet on a already open socket - ******************************************************************/ -static BOOL send_udp(int fd,char *buf,int len,struct in_addr ip,int port) -{ - BOOL ret; - struct sockaddr_in sock_out; - - /* set the address and port */ - bzero((char *)&sock_out,sizeof(sock_out)); - putip((char *)&sock_out.sin_addr,(char *)&ip); - sock_out.sin_port = htons( port ); - sock_out.sin_family = AF_INET; - - DEBUG(5,("%s sending a packet of len %d to (%s) on port %d\n", - timestring(),len,inet_ntoa(ip),port)); - - ret = (sendto(fd,buf,len,0,(struct sockaddr *)&sock_out, - sizeof(sock_out)) >= 0); - - if (!ret) - DEBUG(0,("Packet send failed to %s(%d) ERRNO=%s\n", - inet_ntoa(ip),port,strerror(errno))); - - if (ret) - num_good_sends++; - - return(ret); -} - -/******************************************************************* - build a dgram packet ready for sending - - XXXX This currently doesn't handle packets too big for one - datagram. It should split them and use the packet_offset, more and - first flags to handle the fragmentation. Yuck. - ******************************************************************/ -static int build_dgram(char *buf,struct packet_struct *p) -{ - struct dgram_packet *dgram = &p->packet.dgram; - unsigned char *ubuf = (unsigned char *)buf; - int offset=0; - - /* put in the header */ - ubuf[0] = dgram->header.msg_type; - ubuf[1] = (((int)dgram->header.flags.node_type)<<2); - if (dgram->header.flags.more) ubuf[1] |= 1; - if (dgram->header.flags.first) ubuf[1] |= 2; - RSSVAL(ubuf,2,dgram->header.dgm_id); - putip(ubuf+4,(char *)&dgram->header.source_ip); - RSSVAL(ubuf,8,dgram->header.source_port); - RSSVAL(ubuf,12,dgram->header.packet_offset); - - offset = 14; - - if (dgram->header.msg_type == 0x10 || - dgram->header.msg_type == 0x11 || - dgram->header.msg_type == 0x12) { - offset += put_nmb_name((char *)ubuf,offset,&dgram->source_name); - offset += put_nmb_name((char *)ubuf,offset,&dgram->dest_name); - } - - memcpy(ubuf+offset,dgram->data,dgram->datasize); - offset += dgram->datasize; - - /* automatically set the dgm_length */ - dgram->header.dgm_length = offset; - RSSVAL(ubuf,10,dgram->header.dgm_length); - - return(offset); -} - -/******************************************************************* - build a nmb name - ******************************************************************/ -void make_nmb_name(struct nmb_name *n,char *name,int type,char *this_scope) -{ - strcpy(n->name,name); - strupper(n->name); - n->name_type = type; - strcpy(n->scope,this_scope); -} - - -/******************************************************************* - build a nmb packet ready for sending - - XXXX this currently relies on not being passed something that expands - to a packet too big for the buffer. Eventually this should be - changed to set the trunc bit so the receiver can request the rest - via tcp (when that becomes supported) - ******************************************************************/ -static int build_nmb(char *buf,struct packet_struct *p) -{ - struct nmb_packet *nmb = &p->packet.nmb; - unsigned char *ubuf = (unsigned char *)buf; - int offset=0; - - /* put in the header */ - RSSVAL(ubuf,offset,nmb->header.name_trn_id); - ubuf[offset+2] = (nmb->header.opcode & 0xF) << 3; - if (nmb->header.response) ubuf[offset+2] |= (1<<7); - if (nmb->header.nm_flags.authoritative && - nmb->header.response) ubuf[offset+2] |= 0x4; - if (nmb->header.nm_flags.trunc) ubuf[offset+2] |= 0x2; - if (nmb->header.nm_flags.recursion_desired) ubuf[offset+2] |= 0x1; - if (nmb->header.nm_flags.recursion_available && - nmb->header.response) ubuf[offset+3] |= 0x80; - if (nmb->header.nm_flags.bcast) ubuf[offset+3] |= 0x10; - ubuf[offset+3] |= (nmb->header.rcode & 0xF); - - RSSVAL(ubuf,offset+4,nmb->header.qdcount); - RSSVAL(ubuf,offset+6,nmb->header.ancount); - RSSVAL(ubuf,offset+8,nmb->header.nscount); - RSSVAL(ubuf,offset+10,nmb->header.arcount); - - offset += 12; - if (nmb->header.qdcount) { - /* XXXX this doesn't handle a qdcount of > 1 */ - offset += put_nmb_name((char *)ubuf,offset,&nmb->question.question_name); - RSSVAL(ubuf,offset,nmb->question.question_type); - RSSVAL(ubuf,offset+2,nmb->question.question_class); - offset += 4; - } - - if (nmb->header.ancount) - offset += put_res_rec((char *)ubuf,offset,nmb->answers, - nmb->header.ancount); - - if (nmb->header.nscount) - offset += put_res_rec((char *)ubuf,offset,nmb->nsrecs, - nmb->header.nscount); - - if (nmb->header.arcount) - offset += put_res_rec((char *)ubuf,offset,nmb->additional, - nmb->header.arcount); - - return(offset); -} - - -/******************************************************************* - send a packet_struct - ******************************************************************/ -BOOL send_packet(struct packet_struct *p) -{ - char buf[1024]; - int len=0; - - bzero(buf,sizeof(buf)); - - switch (p->packet_type) - { - case NMB_PACKET: - len = build_nmb(buf,p); - break; - - case DGRAM_PACKET: - len = build_dgram(buf,p); - break; - } - - if (!len) return(False); - - return(send_udp(p->fd,buf,len,p->ip,p->port)); -} - -/**************************************************************************** - receive a packet with timeout on a open UDP filedescriptor - The timeout is in milliseconds - ***************************************************************************/ -struct packet_struct *receive_packet(int fd,enum packet_type type,int t) -{ - fd_set fds; - struct timeval timeout; - - FD_ZERO(&fds); - FD_SET(fd,&fds); - timeout.tv_sec = t/1000; - timeout.tv_usec = 1000*(t%1000); - - sys_select(&fds,&timeout); - - if (FD_ISSET(fd,&fds)) - return(read_packet(fd,type)); - - return(NULL); -} - - |