/* 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 SMB Version handling Copyright (C) John H Terpstra 1995-1998 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" extern int updatecount; extern bool found_lm_clients; /**************************************************************************** Send a browser reset packet. **************************************************************************/ void send_browser_reset(int reset_type, const char *to_name, int to_type, struct in_addr to_ip) { char outbuf[1024]; char *p; DEBUG(3,("send_browser_reset: sending reset request type %d to %s<%02x> IP %s.\n", reset_type, to_name, to_type, inet_ntoa(to_ip) )); memset(outbuf,'\0',sizeof(outbuf)); p = outbuf; SCVAL(p,0,ANN_ResetBrowserState); p++; SCVAL(p,0,reset_type); p++; send_mailslot(True, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf), global_myname(), 0x0, to_name, to_type, to_ip, FIRST_SUBNET->myip, DGRAM_PORT); } /**************************************************************************** Broadcast a packet to the local net requesting that all servers in this workgroup announce themselves to us. **************************************************************************/ void broadcast_announce_request(struct subnet_record *subrec, struct work_record *work) { char outbuf[1024]; char *p; work->needannounce = True; DEBUG(3,("broadcast_announce_request: sending announce request for workgroup %s \ to subnet %s\n", work->work_group, subrec->subnet_name)); memset(outbuf,'\0',sizeof(outbuf)); p = outbuf; SCVAL(p,0,ANN_AnnouncementRequest); p++; SCVAL(p,0,work->token); /* (local) Unique workgroup token id. */ p++; p += push_string_check(p+1, global_myname(), 15, STR_ASCII|STR_UPPER|STR_TERMINATE); send_mailslot(False, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf), global_myname(), 0x0, work->work_group,0x1e, subrec->bcast_ip, subrec->myip, DGRAM_PORT); } /**************************************************************************** Broadcast an announcement. **************************************************************************/ static void send_announcement(struct subnet_record *subrec, int announce_type, const char *from_name, const char *to_name, int to_type, struct in_addr to_ip, time_t announce_interval, const char *server_name, int server_type, const char *server_comment) { char outbuf[1024]; unstring upper_server_name; char *p; memset(outbuf,'\0',sizeof(outbuf)); p = outbuf+1; SCVAL(outbuf,0,announce_type); /* Announcement parameters. */ SCVAL(p,0,updatecount); SIVAL(p,1,announce_interval*1000); /* Milliseconds - despite the spec. */ safe_strcpy(upper_server_name, server_name, sizeof(upper_server_name)-1); strupper_m(upper_server_name); push_string_check(p+5, upper_server_name, 16, STR_ASCII|STR_TERMINATE); SCVAL(p,21,lp_major_announce_version()); /* Major version. */ SCVAL(p,22,lp_minor_announce_version()); /* Minor version. */ SIVAL(p,23,server_type & ~SV_TYPE_LOCAL_LIST_ONLY); /* Browse version: got from NT/AS 4.00 - Value defined in smb.h (JHT). */ SSVAL(p,27,BROWSER_ELECTION_VERSION); SSVAL(p,29,BROWSER_CONSTANT); /* Browse signature. */ p += 31 + push_string_check(p+31, server_comment, sizeof(outbuf) - (p + 31 - outbuf), STR_ASCII|STR_TERMINATE); send_mailslot(False,BROWSE_MAILSLOT, outbuf, PTR_DIFF(p,outbuf), from_name, 0x0, to_name, to_type, to_ip, subrec->myip, DGRAM_PORT); } /**************************************************************************** Broadcast a LanMan announcement. **************************************************************************/ static void send_lm_announcement(struct subnet_record *subrec, int announce_type, char *from_name, char *to_name, int to_type, struct in_addr to_ip, time_t announce_interval, char *server_name, int server_type, char *server_comment) { char outbuf[1024]; char *p=outbuf; memset(outbuf,'\0',sizeof(outbuf)); SSVAL(p,0,announce_type); SIVAL(p,2,server_type & ~SV_TYPE_LOCAL_LIST_ONLY); SCVAL(p,6,lp_major_announce_version()); /* Major version. */ SCVAL(p,7,lp_minor_announce_version()); /* Minor version. */ SSVAL(p,8,announce_interval); /* In seconds - according to spec. */ p += 10; p += push_string_check(p, server_name, 15, STR_ASCII|STR_UPPER|STR_TERMINATE); p += push_string_check(p, server_comment, sizeof(outbuf)- (p - outbuf), STR_ASCII|STR_UPPER|STR_TERMINATE); send_mailslot(False,LANMAN_MAILSLOT, outbuf, PTR_DIFF(p,outbuf), from_name, 0x0, to_name, to_type, to_ip, subrec->myip, DGRAM_PORT); } /**************************************************************************** We are a local master browser. Announce this to WORKGROUP<1e>. ****************************************************************************/ static void send_local_master_announcement(struct subnet_record *subrec, struct work_record *work, struct server_record *servrec) { /* Ensure we don't have the prohibited bit set. */ uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY; DEBUG(3,("send_local_master_announcement: type %x for name %s on subnet %s for workgroup %s\n", type, global_myname(), subrec->subnet_name, work->work_group)); send_announcement(subrec, ANN_LocalMasterAnnouncement, global_myname(), /* From nbt name. */ work->work_group, 0x1e, /* To nbt name. */ subrec->bcast_ip, /* To ip. */ work->announce_interval, /* Time until next announce. */ global_myname(), /* Name to announce. */ type, /* Type field. */ servrec->serv.comment); } /**************************************************************************** Announce the workgroup WORKGROUP to MSBROWSE<01>. ****************************************************************************/ static void send_workgroup_announcement(struct subnet_record *subrec, struct work_record *work) { DEBUG(3,("send_workgroup_announcement: on subnet %s for workgroup %s\n", subrec->subnet_name, work->work_group)); send_announcement(subrec, ANN_DomainAnnouncement, global_myname(), /* From nbt name. */ MSBROWSE, 0x1, /* To nbt name. */ subrec->bcast_ip, /* To ip. */ work->announce_interval, /* Time until next announce. */ work->work_group, /* Name to announce. */ SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT, /* workgroup announce flags. */ global_myname()); /* From name as comment. */ } /**************************************************************************** Announce the given host to WORKGROUP<1d>. ****************************************************************************/ static void send_host_announcement(struct subnet_record *subrec, struct work_record *work, struct server_record *servrec) { /* Ensure we don't have the prohibited bits set. */ uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY; DEBUG(3,("send_host_announcement: type %x for host %s on subnet %s for workgroup %s\n", type, servrec->serv.name, subrec->subnet_name, work->work_group)); send_announcement(subrec, ANN_HostAnnouncement, servrec->serv.name, /* From nbt name. */ work->work_group, 0x1d, /* To nbt name. */ subrec->bcast_ip, /* To ip. */ work->announce_interval, /* Time until next announce. */ servrec->serv.name, /* Name to announce. */ type, /* Type field. */ servrec->serv.comment); } /**************************************************************************** Announce the given LanMan host ****************************************************************************/ static void send_lm_host_announcement(struct subnet_record *subrec, struct work_record *work, struct server_record *servrec, int lm_interval) { /* Ensure we don't have the prohibited bits set. */ uint32 type = servrec->serv.type & ~SV_TYPE_LOCAL_LIST_ONLY; DEBUG(3,("send_lm_host_announcement: type %x for host %s on subnet %s for workgroup %s, ttl: %d\n", type, servrec->serv.name, subrec->subnet_name, work->work_group, lm_interval)); send_lm_announcement(subrec, ANN_HostAnnouncement, servrec->serv.name, /* From nbt name. */ work->work_group, 0x00, /* To nbt name. */ subrec->bcast_ip, /* To ip. */ lm_interval, /* Time until next announce. */ servrec->serv.name, /* Name to announce (fstring not netbios name struct). */ type, /* Type field. */ servrec->serv.comment); } /**************************************************************************** Announce a server record. ****************************************************************************/ static void announce_server(struct subnet_record *subrec, struct work_record *work, struct server_record *servrec) { /* Only do domain announcements if we are a master and it's our primary name we're being asked to announce. */ if (AM_LOCAL_MASTER_BROWSER(work) && strequal(global_myname(),servrec->serv.name)) { send_local_master_announcement(subrec, work, servrec); send_workgroup_announcement(subrec, work); } else { send_host_announcement(subrec, work, servrec); } } /**************************************************************************** Go through all my registered names on all broadcast subnets and announce them if the timeout requires it. **************************************************************************/ void announce_my_server_names(time_t t) { struct subnet_record *subrec; for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) { struct work_record *work = find_workgroup_on_subnet(subrec, lp_workgroup()); if(work) { struct server_record *servrec; if (work->needannounce) { /* Drop back to a max 3 minute announce. This is to prevent a single lost packet from breaking things for too long. */ work->announce_interval = MIN(work->announce_interval, CHECK_TIME_MIN_HOST_ANNCE*60); work->lastannounce_time = t - (work->announce_interval+1); work->needannounce = False; } /* Announce every minute at first then progress to every 12 mins */ if ((t - work->lastannounce_time) < work->announce_interval) continue; if (work->announce_interval < (CHECK_TIME_MAX_HOST_ANNCE * 60)) work->announce_interval += 60; work->lastannounce_time = t; for (servrec = work->serverlist; servrec; servrec = servrec->next) { if (is_myname(servrec->serv.name)) announce_server(subrec, work, servrec); } } /* if work */ } /* for subrec */ } /**************************************************************************** Go through all my registered names on all broadcast subnets and announce them as a LanMan server if the timeout requires it. **************************************************************************/ void announce_my_lm_server_names(time_t t) { struct subnet_record *subrec; static time_t last_lm_announce_time=0; int announce_interval = lp_lm_interval(); int lm_announce = lp_lm_announce(); if ((announce_interval <= 0) || (lm_announce <= 0)) { /* user absolutely does not want LM announcements to be sent. */ return; } if ((lm_announce >= 2) && (!found_lm_clients)) { /* has been set to 2 (Auto) but no LM clients detected (yet). */ return; } /* Otherwise: must have been set to 1 (Yes), or LM clients *have* been detected. */ for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) { struct work_record *work = find_workgroup_on_subnet(subrec, lp_workgroup()); if(work) { struct server_record *servrec; if (last_lm_announce_time && ((t - last_lm_announce_time) < announce_interval )) continue; last_lm_announce_time = t; for (servrec = work->serverlist; servrec; servrec = servrec->next) { if (is_myname(servrec->serv.name)) /* skipping equivalent of announce_server() */ send_lm_host_announcement(subrec, work, servrec, announce_interval); } } /* if work */ } /* for subrec */ } /* Announce timer. Moved into global static so it can be reset when a machine becomes a local master browser. */ static time_t announce_timer_last=0; /**************************************************************************** Reset the announce_timer so that a local master browser announce will be done immediately. ****************************************************************************/ void reset_announce_timer(void) { announce_timer_last = time(NULL) - (CHECK_TIME_MST_ANNOUNCE * 60); } /**************************************************************************** Announce myself as a local master browser to a domain master browser. **************************************************************************/ void announce_myself_to_domain_master_browser(time_t t) { struct subnet_record *subrec; struct work_record *work; if(!we_are_a_wins_client()) { DEBUG(10,("announce_myself_to_domain_master_browser: no unicast subnet, ignoring.\n")); return; } if (!announce_timer_last) announce_timer_last = t; if ((t-announce_timer_last) < (CHECK_TIME_MST_ANNOUNCE * 60)) { DEBUG(10,("announce_myself_to_domain_master_browser: t (%d) - last(%d) < %d\n", (int)t, (int)announce_timer_last, CHECK_TIME_MST_ANNOUNCE * 60 )); return; } announce_timer_last = t; /* Look over all our broadcast subnets to see if any of them has the state set as local master browser. */ for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) { for (work = subrec->workgrouplist; work; work = work->next) { if (AM_LOCAL_MASTER_BROWSER(work)) { DEBUG(4,( "announce_myself_to_domain_master_browser: I am a local master browser for \ workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name)); /* Look in nmbd_browsersync.c for the rest of this code. */ announce_and_sync_with_domain_master_browser(subrec, work); } } } } /**************************************************************************** Announce all samba's server entries as 'gone'. This must *only* be called on shutdown. ****************************************************************************/ void announce_my_servers_removed(void) { int announce_interval = lp_lm_interval(); int lm_announce = lp_lm_announce(); 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; work->announce_interval = 0; for (servrec = work->serverlist; servrec; servrec = servrec->next) { if (!is_myname(servrec->serv.name)) continue; servrec->serv.type = 0; if(AM_LOCAL_MASTER_BROWSER(work)) send_local_master_announcement(subrec, work, servrec); send_host_announcement(subrec, work, servrec); if ((announce_interval <= 0) || (lm_announce <= 0)) { /* user absolutely does not want LM announcements to be sent. */ continue; } if ((lm_announce >= 2) && (!found_lm_clients)) { /* has been set to 2 (Auto) but no LM clients detected (yet). */ continue; } /* * lm announce was set or we have seen lm announcements, so do * a lm announcement of host removed. */ send_lm_host_announcement(subrec, work, servrec, 0); } } } } /**************************************************************************** Do all the "remote" announcements. These are used to put ourselves on a remote browse list. They are done blind, no checking is done to see if there is actually a local master browser at the other end. **************************************************************************/ void announce_remote(time_t t) { char *s; const char *ptr; static time_t last_time = 0; char *s2; struct in_addr addr; char *comment; int stype = lp_default_server_announce(); TALLOC_CTX *frame = NULL; if (last_time && (t < (last_time + REMOTE_ANNOUNCE_INTERVAL))) return; last_time = t; s = lp_remote_announce(); if (!*s) return; comment = string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH); frame = talloc_stackframe(); for (ptr=s; next_token_talloc(frame,&ptr,&s2,NULL); ) { /* The entries are of the form a.b.c.d/WORKGROUP with WORKGROUP being optional */ const char *wgroup; char *pwgroup; int i; pwgroup = strchr_m(s2,'/'); if (pwgroup) *pwgroup++ = 0; if (!pwgroup || !*pwgroup) wgroup = lp_workgroup(); else wgroup = pwgroup; addr = interpret_addr2(s2); /* Announce all our names including aliases */ /* Give the ip address as the address of our first broadcast subnet. */ for(i=0; my_netbios_names(i); i++) { const char *name = my_netbios_names(i); DEBUG(5,("announce_remote: Doing remote announce for server %s to IP %s.\n", name, inet_ntoa(addr) )); send_announcement(FIRST_SUBNET, ANN_HostAnnouncement, name, /* From nbt name. */ wgroup, 0x1d, /* To nbt name. */ addr, /* To ip. */ REMOTE_ANNOUNCE_INTERVAL, /* Time until next announce. */ name, /* Name to announce. */ stype, /* Type field. */ comment); } } TALLOC_FREE(frame); } /**************************************************************************** Implement the 'remote browse sync' feature Andrew added. These are used to put our browse lists into remote browse lists. **************************************************************************/ void browse_sync_remote(time_t t) { char *s; const char *ptr; static time_t last_time = 0; char *s2; struct in_addr addr; struct work_record *work; char outbuf[1024]; char *p; unstring myname; TALLOC_CTX *frame = NULL; if (last_time && (t < (last_time + REMOTE_ANNOUNCE_INTERVAL))) return; last_time = t; s = lp_remote_browse_sync(); if (!*s) return; /* * We only do this if we are the local master browser * for our workgroup on the firsst subnet. */ if((work = find_workgroup_on_subnet(FIRST_SUBNET, lp_workgroup())) == NULL) { DEBUG(0,("browse_sync_remote: Cannot find workgroup %s on subnet %s\n", lp_workgroup(), FIRST_SUBNET->subnet_name )); return; } if(!AM_LOCAL_MASTER_BROWSER(work)) { DEBUG(5,("browse_sync_remote: We can only do this if we are a local master browser \ for workgroup %s on subnet %s.\n", lp_workgroup(), FIRST_SUBNET->subnet_name )); return; } memset(outbuf,'\0',sizeof(outbuf)); p = outbuf; SCVAL(p,0,ANN_MasterAnnouncement); p++; unstrcpy(myname, global_myname()); strupper_m(myname); myname[15]='\0'; push_ascii(p, myname, sizeof(outbuf)-PTR_DIFF(p,outbuf)-1, STR_TERMINATE); p = skip_string(outbuf,sizeof(outbuf),p); frame = talloc_stackframe(); for (ptr=s; next_token_talloc(frame,&ptr,&s2,NULL); ) { /* The entries are of the form a.b.c.d */ addr = interpret_addr2(s2); DEBUG(5,("announce_remote: Doing remote browse sync announce for server %s to IP %s.\n", global_myname(), inet_ntoa(addr) )); send_mailslot(True, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf), global_myname(), 0x0, "*", 0x0, addr, FIRST_SUBNET->myip, DGRAM_PORT); } TALLOC_FREE(frame); }