diff options
Diffstat (limited to 'source3/nmbd/nmbd_incomingdgrams.c')
| -rw-r--r-- | source3/nmbd/nmbd_incomingdgrams.c | 841 |
1 files changed, 841 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_incomingdgrams.c b/source3/nmbd/nmbd_incomingdgrams.c new file mode 100644 index 0000000..80fb304 --- /dev/null +++ b/source3/nmbd/nmbd_incomingdgrams.c @@ -0,0 +1,841 @@ +/* + Unix SMB/CIFS implementation. + NBT netbios routines and daemon - version 2 + Copyright (C) Andrew Tridgell 1994-1998 + Copyright (C) Luke Kenneth Casson Leighton 1994-1998 + Copyright (C) Jeremy Allison 1994-1998 + + 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 3 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, see <http://www.gnu.org/licenses/>. + +*/ + +#include "includes.h" +#include "../librpc/gen_ndr/svcctl.h" +#include "nmbd/nmbd.h" +#include "lib/util/string_wrappers.h" + +extern bool found_lm_clients; + +#if 0 + +/* XXXX note: This function is currently unsuitable for use, as it + does not properly check that a server is in a fit state to become + a backup browser before asking it to be one. + The code is left here to be worked on at a later date. +*/ + +/**************************************************************************** +Tell a server to become a backup browser +**************************************************************************/ + +void tell_become_backup(void) +{ + struct subnet_record *subrec; + for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) + { + struct work_record *work; + for (work = subrec->workgrouplist; work; work = work->next) + { + struct server_record *servrec; + int num_servers = 0; + int num_backups = 0; + + for (servrec = work->serverlist; servrec; servrec = servrec->next) + { + num_servers++; + + if (is_myname(servrec->serv.name)) + continue; + + if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER) + { + num_backups++; + continue; + } + + if (servrec->serv.type & SV_TYPE_MASTER_BROWSER) + continue; + + if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER)) + continue; + + DEBUG(3,("num servers: %d num backups: %d\n", + num_servers, num_backups)); + + /* make first server a backup server. thereafter make every + tenth server a backup server */ + if (num_backups != 0 && (num_servers+9) / num_backups > 10) + continue; + + DEBUG(2,("sending become backup to %s %s for %s\n", + servrec->serv.name, inet_ntoa(subrec->bcast_ip), + work->work_group)); + + /* type 11 request from MYNAME(20) to WG(1e) for SERVER */ + do_announce_request(servrec->serv.name, work->work_group, + ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip); + } + } + } +} +#endif + +/******************************************************************* + Process an incoming host announcement packet. +*******************************************************************/ + +void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + int ttl = IVAL(buf,1)/1000; + unstring announce_name; + uint32_t servertype = IVAL(buf,23); + fstring comment; + struct work_record *work; + struct server_record *servrec; + unstring work_name; + unstring source_name; + ZERO_STRUCT(source_name); + ZERO_STRUCT(announce_name); + + pull_ascii_fstring(comment, buf+31); + + pull_ascii_nstring(announce_name, sizeof(announce_name), buf+5); + pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name); + + DEBUG(3,("process_host_announce: from %s<%02x> IP %s to \ +%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name),announce_name)); + + DEBUG(5,("process_host_announce: ttl=%d server type=%08x comment=%s\n", + ttl, servertype,comment)); + + /* Filter servertype to remove impossible bits. */ + servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM); + + /* A host announcement must be sent to the name WORKGROUP<1d>. */ + if(dgram->dest_name.name_type != 0x1d) { + DEBUG(2,("process_host_announce: incorrect name type for destination from IP %s \ +(was %02x) should be 0x1d. Allowing packet anyway.\n", + inet_ntoa(p->ip), dgram->dest_name.name_type)); + /* Change it so it was. */ + dgram->dest_name.name_type = 0x1d; + } + + /* For a host announce the workgroup name is the destination name. */ + pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name); + + /* + * Syntax servers version 5.1 send HostAnnounce packets to + * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00> + * instead of WORKGROUP<1d> name. So to fix this we check if + * the workgroup name is our own name, and if so change it + * to be our primary workgroup name. + */ + + if(strequal(work_name, lp_netbios_name())) + unstrcpy(work_name,lp_workgroup()); + + /* + * We are being very agressive here in adding a workgroup + * name on the basis of a host announcing itself as being + * in that workgroup. Maybe we should wait for the workgroup + * announce instead ? JRA. + */ + + work = find_workgroup_on_subnet(subrec, work_name); + + if(servertype != 0) { + if (work ==NULL ) { + /* We have no record of this workgroup. Add it. */ + if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL) + goto done; + } + + if((servrec = find_server_in_workgroup( work, announce_name))==NULL) { + /* If this server is not already in the workgroup, add it. */ + create_server_on_workgroup(work, announce_name, + servertype|SV_TYPE_LOCAL_LIST_ONLY, + ttl, comment); + } else { + /* Update the record. */ + servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY; + update_server_ttl( servrec, ttl); + strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)); + } + } else { + /* + * This server is announcing it is going down. Remove it from the + * workgroup. + */ + if(!is_myname(announce_name) && (work != NULL) && + ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) { + remove_server_from_workgroup( work, servrec); + } + } + + subrec->work_changed = True; +done: + return; +} + +/******************************************************************* + Process an incoming WORKGROUP announcement packet. +*******************************************************************/ + +void process_workgroup_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + int ttl = IVAL(buf,1)/1000; + unstring workgroup_announce_name; + unstring master_name; + uint32_t servertype = IVAL(buf,23); + struct work_record *work; + unstring source_name; + unstring dest_name; + + pull_ascii_nstring(workgroup_announce_name,sizeof(workgroup_announce_name),buf+5); + pull_ascii_nstring(master_name,sizeof(master_name),buf+31); + pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name); + pull_ascii_nstring(dest_name,sizeof(dest_name),dgram->dest_name.name); + + DEBUG(3,("process_workgroup_announce: from %s<%02x> IP %s to \ +%s for workgroup %s.\n", source_name, source_name[15], inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name),workgroup_announce_name)); + + DEBUG(5,("process_workgroup_announce: ttl=%d server type=%08x master browser=%s\n", + ttl, servertype, master_name)); + + /* Workgroup announcements must only go to the MSBROWSE name. */ + if (!strequal(dest_name, MSBROWSE) || (dgram->dest_name.name_type != 0x1)) { + DEBUG(0,("process_workgroup_announce: from IP %s should be to __MSBROWSE__<0x01> not %s\n", + inet_ntoa(p->ip), nmb_namestr(&dgram->dest_name))); + goto done; + } + + if ((work = find_workgroup_on_subnet(subrec, workgroup_announce_name))==NULL) { + /* We have no record of this workgroup. Add it. */ + if((work = create_workgroup_on_subnet(subrec, workgroup_announce_name, ttl))==NULL) + goto done; + } else { + /* Update the workgroup death_time. */ + update_workgroup_ttl(work, ttl); + } + + if(*work->local_master_browser_name == '\0') { + /* Set the master browser name. */ + set_workgroup_local_master_browser_name( work, master_name ); + } + + subrec->work_changed = True; + +done: + return; +} + +/******************************************************************* + Process an incoming local master browser announcement packet. +*******************************************************************/ + +void process_local_master_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + int ttl = IVAL(buf,1)/1000; + unstring server_name; + uint32_t servertype = IVAL(buf,23); + fstring comment; + unstring work_name; + struct work_record *work = NULL; + struct server_record *servrec; + unstring source_name; + + pull_ascii_nstring(server_name,sizeof(server_name),buf+5); + pull_ascii_fstring(comment, buf+31); + pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name); + pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name); + + DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \ +%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name),server_name)); + + DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n", + ttl, servertype, comment)); + + /* A local master announcement must be sent to the name WORKGROUP<1e>. */ + if(dgram->dest_name.name_type != 0x1e) { + DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \ +(was %02x) should be 0x1e. Ignoring packet.\n", + inet_ntoa(p->ip), dgram->dest_name.name_type)); + goto done; + } + + /* Filter servertype to remove impossible bits. */ + servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM); + + /* For a local master announce the workgroup name is the destination name. */ + + if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL) { + /* Don't bother adding if it's a local master release announce. */ + if(servertype == 0) + goto done; + + /* We have no record of this workgroup. Add it. */ + if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL) + goto done; + } + + /* If we think we're the local master browser for this workgroup, + we should never have got this packet. We don't see our own + packets. + */ + if(AM_LOCAL_MASTER_BROWSER(work)) { + DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \ +a local master browser for workgroup %s and we think we are master. Forcing election.\n", + server_name, inet_ntoa(p->ip), work_name)); + + /* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when + they have become a local master browser once, they will never + stop sending local master announcements. To fix this we send + them a reset browser packet, with level 0x2 on the __SAMBA__ + name that only they should be listening to. */ + + send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip); + + /* We should demote ourself and force an election. */ + + unbecome_local_master_browser( subrec, work, True); + + /* The actual election requests are handled in nmbd_election.c */ + goto done; + } + + /* Find the server record on this workgroup. If it doesn't exist, add it. */ + + if(servertype != 0) { + if((servrec = find_server_in_workgroup( work, server_name))==NULL) { + /* If this server is not already in the workgroup, add it. */ + create_server_on_workgroup(work, server_name, + servertype|SV_TYPE_LOCAL_LIST_ONLY, + ttl, comment); + } else { + /* Update the record. */ + if (servrec->serv.type != + (servertype|SV_TYPE_LOCAL_LIST_ONLY)) { + servrec->serv.type = + servertype|SV_TYPE_LOCAL_LIST_ONLY; + subrec->work_changed = true; + } + if (!strequal(servrec->serv.comment,comment)) { + strlcpy(servrec->serv.comment, + comment, + sizeof(servrec->serv.comment)); + subrec->work_changed = true; + } + update_server_ttl(servrec, ttl); + } + + if (!strequal(work->local_master_browser_name, server_name)) { + set_workgroup_local_master_browser_name( work, server_name ); + subrec->work_changed = true; + } + } else { + /* + * This server is announcing it is going down. Remove it from the + * workgroup. + */ + if(!is_myname(server_name) && + ((servrec = find_server_in_workgroup( work, server_name))!=NULL)) { + remove_server_from_workgroup( work, servrec); + } + } + +done: + return; +} + +/******************************************************************* + Process a domain master announcement frame. + Domain master browsers receive these from local masters. The Domain + master should then issue a sync with the local master, asking for + that machines local server list. +******************************************************************/ + +void process_master_browser_announce(struct subnet_record *subrec, + struct packet_struct *p,const char *buf) +{ + unstring local_master_name; + struct work_record *work; + struct browse_cache_record *browrec; + + pull_ascii_nstring(local_master_name,sizeof(local_master_name),buf); + + DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n", + local_master_name, inet_ntoa(p->ip))); + + if (!lp_domain_master()) { + DEBUG(0,("process_master_browser_announce: Not configured as domain \ +master - ignoring master announce.\n")); + goto done; + } + + if((work = find_workgroup_on_subnet(subrec, lp_workgroup())) == NULL) { + DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n", + lp_workgroup(), subrec->subnet_name)); + goto done; + } + + if(!AM_DOMAIN_MASTER_BROWSER(work)) { + DEBUG(0,("process_master_browser_announce: Local master announce made to us from \ +%s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip))); + goto done; + } + + /* Add this host as a local master browser entry on the browse lists. + This causes a sync request to be made to it at a later date. + */ + + if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL) { + /* Add it. */ + create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip); + } else { + update_browser_death_time(browrec); + } + +done: + return; +} + +/******************************************************************* + Process an incoming LanMan host announcement packet. +*******************************************************************/ + +void process_lm_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len) +{ + struct dgram_packet *dgram = &p->packet.dgram; + uint32_t servertype = IVAL(buf,1); + int osmajor=CVAL(buf,5); /* major version of node software */ + int osminor=CVAL(buf,6); /* minor version of node software */ + int ttl = SVAL(buf,7); + unstring announce_name; + struct work_record *work; + struct server_record *servrec; + unstring work_name; + unstring source_name; + fstring comment; + char *s = get_safe_str_ptr(buf,len,discard_const_p(char, buf),9); + + if (!s) { + goto done; + } + s = skip_string(buf,len,s); + if (!s) { + goto done; + } + pull_ascii(comment, s, sizeof(fstring), 43, STR_TERMINATE); + + pull_ascii_nstring(announce_name,sizeof(announce_name),buf+9); + pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name); + /* For a LanMan host announce the workgroup name is the destination name. */ + pull_ascii_nstring(work_name,sizeof(work_name),dgram->dest_name.name); + + DEBUG(3,("process_lm_host_announce: LM Announcement from %s IP %s to \ +%s for server %s.\n", nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name),announce_name)); + + DEBUG(5,("process_lm_host_announce: os=(%d,%d) ttl=%d server type=%08x comment=%s\n", + osmajor, osminor, ttl, servertype,comment)); + + if ((osmajor < 36) || (osmajor > 38) || (osminor !=0)) { + DEBUG(5,("process_lm_host_announce: LM Announcement packet does not \ +originate from OS/2 Warp client. Ignoring packet.\n")); + /* Could have been from a Windows machine (with its LM Announce enabled), + or a Samba server. Then don't disrupt the current browse list. */ + goto done; + } + + /* Filter servertype to remove impossible bits. */ + servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM); + + /* A LanMan host announcement must be sent to the name WORKGROUP<00>. */ + if(dgram->dest_name.name_type != 0x00) { + DEBUG(2,("process_lm_host_announce: incorrect name type for destination from IP %s \ +(was %02x) should be 0x00. Allowing packet anyway.\n", + inet_ntoa(p->ip), dgram->dest_name.name_type)); + /* Change it so it was. */ + dgram->dest_name.name_type = 0x00; + } + + /* + * Syntax servers version 5.1 send HostAnnounce packets to + * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00> + * instead of WORKGROUP<1d> name. So to fix this we check if + * the workgroup name is our own name, and if so change it + * to be our primary workgroup name. This code is probably + * not needed in the LanMan announce code, but it won't hurt. + */ + + if(strequal(work_name, lp_netbios_name())) + unstrcpy(work_name,lp_workgroup()); + + /* + * We are being very agressive here in adding a workgroup + * name on the basis of a host announcing itself as being + * in that workgroup. Maybe we should wait for the workgroup + * announce instead ? JRA. + */ + + work = find_workgroup_on_subnet(subrec, work_name); + + if(servertype != 0) { + if (work == NULL) { + /* We have no record of this workgroup. Add it. */ + if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL) + goto done; + } + + if((servrec = find_server_in_workgroup( work, announce_name))==NULL) { + /* If this server is not already in the workgroup, add it. */ + create_server_on_workgroup(work, announce_name, + servertype|SV_TYPE_LOCAL_LIST_ONLY, + ttl, comment); + } else { + /* Update the record. */ + servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY; + update_server_ttl( servrec, ttl); + strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)); + } + } else { + /* + * This server is announcing it is going down. Remove it from the + * workgroup. + */ + if(!is_myname(announce_name) && (work != NULL) && + ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) { + remove_server_from_workgroup( work, servrec); + } + } + + subrec->work_changed = True; + found_lm_clients = True; + +done: + return; +} + +/**************************************************************************** + Send a backup list response. +*****************************************************************************/ + +static void send_backup_list_response(struct subnet_record *subrec, + struct work_record *work, + struct nmb_name *send_to_name, + unsigned char max_number_requested, + uint32_t token, struct in_addr sendto_ip, + int port) +{ + char outbuf[1024]; + char *p, *countptr; + unsigned int count = 0; + unstring send_to_namestr; +#if 0 + struct server_record *servrec; +#endif + unstring myname; + + memset(outbuf,'\0',sizeof(outbuf)); + + DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n", + work->work_group, nmb_namestr(send_to_name), inet_ntoa(sendto_ip))); + + p = outbuf; + + SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */ + p++; + + countptr = p; + p++; + + SIVAL(p,0,token); /* The sender's unique info. */ + p += 4; + + /* We always return at least one name - our own. */ + count = 1; + unstrcpy(myname, lp_netbios_name()); + if (!strupper_m(myname)) { + DEBUG(4,("strupper_m %s failed\n", myname)); + return; + } + myname[15]='\0'; + push_ascii(p, myname, sizeof(outbuf)-PTR_DIFF(p,outbuf)-1, STR_TERMINATE); + + p = skip_string(outbuf,sizeof(outbuf),p); + + /* Look for backup browsers in this workgroup. */ + +#if 0 + /* we don't currently send become_backup requests so we should never + send any other servers names out as backups for our + workgroup. That's why this is commented out (tridge) */ + + /* + * NB. Note that the struct work_record here is not neccessarily + * attached to the subnet *subrec. + */ + + for (servrec = work->serverlist; servrec; servrec = servrec->next) + { + int len = PTR_DIFF(p, outbuf); + if((sizeof(outbuf) - len) < 16) + break; + + if(count >= (unsigned int)max_number_requested) + break; + + if(strnequal(servrec->serv.name, lp_netbios_name(),15)) + continue; + + if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER)) + continue; + + strlcpy(p, servrec->serv.name, 16); + strupper_m(p); + count++; + + DEBUG(5,("send_backup_list_response: Adding server %s number %d\n", + p, count)); + + p = skip_string(outbuf,sizeof(outbuf),p); + } +#endif + + SCVAL(countptr, 0, count); + + pull_ascii_nstring(send_to_namestr, sizeof(send_to_namestr), send_to_name->name); + + DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n", + send_to_namestr, inet_ntoa(sendto_ip), count)); + + send_mailslot(True, BROWSE_MAILSLOT, + outbuf,PTR_DIFF(p,outbuf), + lp_netbios_name(), 0, + send_to_namestr,0, + sendto_ip, subrec->myip, port); +} + +/******************************************************************* + Process a send backup list request packet. + + A client sends a backup list request to ask for a list of servers on + the net that maintain server lists for a domain. A server is then + chosen from this list to send NetServerEnum commands to to list + available servers. + +********************************************************************/ + +void process_get_backup_list_request(struct subnet_record *subrec, + struct packet_struct *p,const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + struct work_record *work; + unsigned char max_number_requested = CVAL(buf,0); + uint32_t token = IVAL(buf,1); /* Sender's key index for the workgroup. */ + int name_type = dgram->dest_name.name_type; + unstring workgroup_name; + struct subnet_record *search_subrec = subrec; + + pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name); + + DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n", + nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name))); + + /* We have to be a master browser, or a domain master browser + for the requested workgroup. That means it must be our + workgroup. */ + + if(strequal(workgroup_name, lp_workgroup()) == False) { + DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n", + workgroup_name)); + goto done; + } + + if((work = find_workgroup_on_subnet(search_subrec, workgroup_name)) == NULL) { + DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \ +subnet %s.\n", workgroup_name, search_subrec->subnet_name)); + goto done; + } + + /* + * If the packet was sent to WORKGROUP<1b> instead + * of WORKGROUP<1d> then it was unicast to us a domain master + * browser. Change search subrec to unicast. + */ + + if(name_type == 0x1b) { + /* We must be a domain master browser in order to + process this packet. */ + + if(!AM_DOMAIN_MASTER_BROWSER(work)) { + DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \ +and I am not a domain master browser.\n", workgroup_name)); + goto done; + } + + search_subrec = unicast_subnet; + } else if (name_type == 0x1d) { + /* We must be a local master browser in order to process this packet. */ + + if(!AM_LOCAL_MASTER_BROWSER(work)) { + DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \ +and I am not a local master browser.\n", workgroup_name)); + goto done; + } + } else { + DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n", + name_type)); + goto done; + } + + send_backup_list_response(subrec, work, &dgram->source_name, + max_number_requested, token, p->ip, p->port); + +done: + return; +} + +/******************************************************************* + Process a reset browser state packet. + + Diagnostic packet: + 0x1 - Stop being a master browser and become a backup browser. + 0x2 - Discard browse lists, stop being a master browser, try again. + 0x4 - Stop being a master browser forever. + +******************************************************************/ + +void process_reset_browser(struct subnet_record *subrec, + struct packet_struct *p,const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + int state = CVAL(buf,0); + struct subnet_record *sr; + + DEBUG(1,("process_reset_browser: received diagnostic browser reset \ +request from %s IP %s state=0x%X\n", + nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), state)); + + /* Stop being a local master browser on all our broadcast subnets. */ + if (state & 0x1) { + for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr)) { + struct work_record *work; + for (work = sr->workgrouplist; work; work = work->next) { + if (AM_LOCAL_MASTER_BROWSER(work)) + unbecome_local_master_browser(sr, work, True); + } + } + } + + /* Discard our browse lists. */ + if (state & 0x2) { + /* + * Calling expire_workgroups_and_servers with a -1 + * time causes all servers not marked with a PERMANENT_TTL + * on the workgroup lists to be discarded, and all + * workgroups with empty server lists to be discarded. + * This means we keep our own server names and workgroup + * as these have a PERMANENT_TTL. + */ + + expire_workgroups_and_servers(-1); + } + + /* Request to stop browsing altogether. */ + if (state & 0x4) + DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n")); +} + +/******************************************************************* + Process an announcement request packet. + We don't respond immediately, we just check it's a request for + our workgroup and then set the flag telling the announce code + in nmbd_sendannounce.c:announce_my_server_names that an + announcement is needed soon. +******************************************************************/ + +void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf) +{ + struct dgram_packet *dgram = &p->packet.dgram; + struct work_record *work; + unstring workgroup_name; + + pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name); + DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n", + nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name))); + + /* We only send announcement requests on our workgroup. */ + if(strequal(workgroup_name, lp_workgroup()) == False) { + DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n", + workgroup_name)); + goto done; + } + + if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL) { + DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n", + workgroup_name)); + goto done; + } + + work->needannounce = True; +done: + return; +} + +/******************************************************************* + Process a LanMan announcement request packet. + We don't respond immediately, we just check it's a request for + our workgroup and then set the flag telling that we have found + a LanMan client (DOS or OS/2) and that we will have to start + sending LanMan announcements (unless specifically disabled + through the "lm announce" parameter in smb.conf) +******************************************************************/ + +void process_lm_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len) +{ + struct dgram_packet *dgram = &p->packet.dgram; + unstring workgroup_name; + + pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name); + DEBUG(3,("process_lm_announce_request: Announce request from %s IP %s to %s.\n", + nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), + nmb_namestr(&dgram->dest_name))); + + /* We only send announcement requests on our workgroup. */ + if(strequal(workgroup_name, lp_workgroup()) == False) { + DEBUG(7,("process_lm_announce_request: Ignoring announce request for workgroup %s.\n", + workgroup_name)); + goto done; + } + + if(find_workgroup_on_subnet(subrec, workgroup_name) == NULL) { + DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n", + workgroup_name)); + goto done; + } + + found_lm_clients = True; + +done: + return; +} |