Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 608 insertions, 0 deletions

diff --git a/source3/nmbd/nmbd_nameregister.c b/source3/nmbd/nmbd_nameregister.c
new file mode 100644
index 0000000..ab37647
--- /dev/null
+++ b/source3/nmbd/nmbd_nameregister.c
@@ -0,0 +1,608 @@
+/* 
+   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 1994-2003
+   
+   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 "nmbd/nmbd.h"
+#include "lib/util/string_wrappers.h"
+
+/* forward declarations */
+static void wins_next_registration(struct response_record *rrec);
+
+
+/****************************************************************************
+ Deal with a response packet when registering one of our names.
+****************************************************************************/
+
+static void register_name_response(struct subnet_record *subrec,
+                       struct response_record *rrec, struct packet_struct *p)
+{
+	/* 
+	 * If we are registering broadcast, then getting a response is an
+	 * error - we do not have the name. If we are registering unicast,
+	 * then we expect to get a response.
+	 */
+
+	struct nmb_packet *nmb = &p->packet.nmb;
+	bool bcast = nmb->header.nm_flags.bcast;
+	bool success = True;
+	struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
+	struct nmb_name *answer_name = &nmb->answers->rr_name;
+	struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+	int ttl = 0;
+	uint16_t nb_flags = 0;
+	struct in_addr register_ip;
+	fstring reg_name;
+	
+	putip(&register_ip,&sent_nmb->additional->rdata[2]);
+	fstrcpy(reg_name, inet_ntoa(register_ip));
+	
+	if (subrec == unicast_subnet) {
+		/* we know that this wins server is definately alive - for the moment! */
+		wins_srv_alive(rrec->packet->ip, register_ip);
+	}
+
+	/* Sanity check. Ensure that the answer name in the incoming packet is the
+	   same as the requested name in the outgoing packet. */
+
+	if(!question_name || !answer_name) {
+		DEBUG(0,("register_name_response: malformed response (%s is NULL).\n",
+			 question_name ? "question_name" : "answer_name" ));
+		return;
+	}
+
+	if(!nmb_name_equal(question_name, answer_name)) {
+		DEBUG(0,("register_name_response: Answer name %s differs from question name %s.\n", 
+			 nmb_namestr(answer_name), nmb_namestr(question_name)));
+		return;
+	}
+
+	if(bcast) {
+		/*
+		 * Special hack to cope with old Samba nmbd's.
+		 * Earlier versions of Samba (up to 1.9.16p11) respond 
+		 * to a broadcast name registration of WORKGROUP<1b> when 
+		 * they should not. Hence, until these versions are gone, 
+		 * we should treat such errors as success for this particular
+		 * case only. jallison@whistle.com.
+		 */
+		
+#if 1 /* OLD_SAMBA_SERVER_HACK */
+		unstring ans_name;
+		pull_ascii_nstring(ans_name, sizeof(ans_name), answer_name->name);
+		if((nmb->header.rcode == ACT_ERR) && strequal(lp_workgroup(), ans_name) &&
+		   (answer_name->name_type == 0x1b)) {
+			/* Pretend we did not get this. */
+			rrec->num_msgs--;
+
+			DEBUG(5,("register_name_response: Ignoring broadcast response to registration of name %s due to old Samba server bug.\n", 
+				 nmb_namestr(answer_name)));
+			return;
+		}
+#endif /* OLD_SAMBA_SERVER_HACK */
+
+		/* Someone else has the name. Log the problem. */
+		DEBUG(1,("register_name_response: Failed to register name %s IP %s on subnet %s via broadcast. Error code was %d. Reject came from IP %s\n", 
+			 nmb_namestr(answer_name), 
+			 reg_name,
+			 subrec->subnet_name, nmb->header.rcode, inet_ntoa(p->ip)));
+		success = False;
+	} else {
+		if (!ip_equal_v4(rrec->packet->ip, p->ip)) {
+			DEBUG(5,("register_name_response: Ignoring WINS server response "
+				"from IP %s, for name %s. We sent to IP %s\n",
+				inet_ntoa(p->ip),
+				nmb_namestr(answer_name),
+				inet_ntoa(rrec->packet->ip)));
+			return;
+		}
+		/* Unicast - check to see if the response allows us to have the name. */
+		if (nmb->header.opcode == NMB_WACK_OPCODE) {
+			/* WINS server is telling us to wait. Pretend we didn't get
+			   the response but don't send out any more register requests. */
+
+			DEBUG(5,("register_name_response: WACK from WINS server %s in registering name %s IP %s\n", 
+				 inet_ntoa(p->ip), nmb_namestr(answer_name), reg_name));
+
+			rrec->repeat_count = 0;
+			/* How long we should wait for. */
+			rrec->repeat_time = p->timestamp + nmb->answers->ttl;
+			rrec->num_msgs--;
+			return;
+		} else if (nmb->header.rcode != 0) {
+			/* Error code - we didn't get the name. */
+			success = False;
+
+			DEBUG(0,("register_name_response: %sserver at IP %s rejected our name registration of %s IP %s with error code %d.\n", 
+				 subrec==unicast_subnet?"WINS ":"",
+				 inet_ntoa(p->ip), 
+				 nmb_namestr(answer_name), 
+				 reg_name,
+				 nmb->header.rcode));
+		} else {
+			success = True;
+			/* Get the data we need to pass to the success function. */
+			nb_flags = get_nb_flags(nmb->answers->rdata);
+			ttl = nmb->answers->ttl;
+
+			/* send off a registration for the next IP, if any */
+			wins_next_registration(rrec);
+		}
+	} 
+
+	DEBUG(5,("register_name_response: %s in registering %sname %s IP %s with %s.\n",
+		 success ? "success" : "failure", 
+		 subrec==unicast_subnet?"WINS ":"",
+		 nmb_namestr(answer_name), 
+		 reg_name,
+		 inet_ntoa(rrec->packet->ip)));
+
+	if(success) {
+		/* Enter the registered name into the subnet name database before calling
+		   the success function. */
+		standard_success_register(subrec, rrec->userdata, answer_name, nb_flags, ttl, register_ip);
+		if( rrec->success_fn)
+			(*(register_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, nb_flags, ttl, register_ip);
+	} else {
+		struct nmb_name qname = *question_name;
+		if( rrec->fail_fn)
+			(*(register_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name);
+		/* Remove the name. */
+		standard_fail_register( subrec, &qname);
+	}
+
+	/* Ensure we don't retry. */
+	remove_response_record(subrec, rrec);
+}
+
+/****************************************************************************
+ Deal with a timeout of a WINS registration request
+****************************************************************************/
+
+static void wins_registration_timeout(struct subnet_record *subrec,
+				      struct response_record *rrec)
+{
+	struct userdata_struct *userdata = rrec->userdata;
+	struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+	struct nmb_name *nmbname = &sent_nmb->question.question_name;
+	struct in_addr register_ip;
+	fstring src_addr;
+
+	putip(&register_ip,&sent_nmb->additional->rdata[2]);
+
+	fstrcpy(src_addr, inet_ntoa(register_ip));
+
+	DEBUG(2,("wins_registration_timeout: WINS server %s timed out registering IP %s\n", 
+		 inet_ntoa(rrec->packet->ip), src_addr));
+
+	/* mark it temporarily dead for this source address */
+	wins_srv_died(rrec->packet->ip, register_ip);
+
+	/* if we have some userdata then use that to work out what
+	   wins server to try next */
+	if (userdata) {
+		const char *tag = (const char *)userdata->data;
+
+		/* try the next wins server in our failover list for
+		   this tag */
+		rrec->packet->ip = wins_srv_ip_tag(tag, register_ip);
+	}
+
+	/* if we have run out of wins servers for this tag then they
+	   must all have timed out. We treat this as *success*, not
+	   failure, and go into our standard name refresh mode. This
+	   copes with all the wins servers being down */
+	if (wins_srv_is_dead(rrec->packet->ip, register_ip)) {
+		uint16_t nb_flags = get_nb_flags(sent_nmb->additional->rdata);
+		int ttl = sent_nmb->additional->ttl;
+
+		standard_success_register(subrec, userdata, nmbname, nb_flags, ttl, register_ip);
+		if(rrec->success_fn) {
+			(*(register_name_success_function)rrec->success_fn)(subrec, 
+									    rrec->userdata, 
+									    nmbname, 
+									    nb_flags, 
+									    ttl, 
+									    register_ip);
+		}
+
+		/* send off a registration for the next IP, if any */
+		wins_next_registration(rrec);
+
+		/* don't need to send this packet any more */
+		remove_response_record(subrec, rrec);
+		return;
+	}
+	
+	/* we will be moving to the next WINS server for this group,
+	   send it immediately */
+	rrec->repeat_count = 2;
+	rrec->repeat_time = time(NULL) + 1;
+	rrec->in_expiration_processing = False;
+
+	DEBUG(6,("Retrying register of name %s IP %s with WINS server %s\n",
+		 nmb_namestr(nmbname), src_addr, inet_ntoa(rrec->packet->ip)));
+
+	/* notice that we don't remove the response record. This keeps
+	   us trying to register with each of our failover wins servers */
+}
+
+/****************************************************************************
+ Deal with a timeout when registering one of our names.
+****************************************************************************/
+
+static void register_name_timeout_response(struct subnet_record *subrec,
+					   struct response_record *rrec)
+{
+	/*
+	 * If we are registering unicast, then NOT getting a response is an
+	 * error - we do not have the name. If we are registering broadcast,
+	 * then we don't expect to get a response.
+	 */
+
+	struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+	bool bcast = sent_nmb->header.nm_flags.bcast;
+	bool success = False;
+	struct nmb_name *question_name = &sent_nmb->question.question_name;
+	uint16_t nb_flags = 0;
+	int ttl = 0;
+	struct in_addr registered_ip;
+	
+	if (bcast) {
+		if(rrec->num_msgs == 0) {
+			/* Not receiving a message is success for broadcast registration. */
+			success = True; 
+
+			/* Pull the success values from the original request packet. */
+			nb_flags = get_nb_flags(sent_nmb->additional->rdata);
+			ttl = sent_nmb->additional->ttl;
+			putip(&registered_ip,&sent_nmb->additional->rdata[2]);
+		}
+	} else {
+		/* wins timeouts are special */
+		wins_registration_timeout(subrec, rrec);
+		return;
+	}
+
+	DEBUG(5,("register_name_timeout_response: %s in registering name %s on subnet %s.\n",
+		 success ? "success" : "failure", nmb_namestr(question_name), subrec->subnet_name));
+	if(success) {
+		/* Enter the registered name into the subnet name database before calling
+		   the success function. */
+		standard_success_register(subrec, rrec->userdata, question_name, nb_flags, ttl, registered_ip);
+		if( rrec->success_fn)
+			(*(register_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, nb_flags, ttl, registered_ip);
+	} else {
+		struct nmb_name qname = *question_name;
+		if( rrec->fail_fn)
+			(*(register_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name);
+		/* Remove the name. */
+		standard_fail_register( subrec, &qname);
+	}
+
+	/* Ensure we don't retry. */
+	remove_response_record(subrec, rrec);
+}
+
+/****************************************************************************
+ Initiate one multi-homed name registration packet.
+****************************************************************************/
+
+static void multihomed_register_one(struct nmb_name *nmbname,
+				    uint16_t nb_flags,
+				    register_name_success_function success_fn,
+				    register_name_fail_function fail_fn,
+				    struct in_addr ip,
+				    const char *tag)
+{
+	struct userdata_struct *userdata;
+	struct in_addr wins_ip = wins_srv_ip_tag(tag, ip);
+	fstring ip_str;
+
+	userdata = (struct userdata_struct *)SMB_MALLOC(sizeof(*userdata) + strlen(tag) + 1);
+	if (!userdata) {
+		DEBUG(0,("Failed to allocate userdata structure!\n"));
+		return;
+	}
+	ZERO_STRUCTP(userdata);
+	userdata->userdata_len = strlen(tag) + 1;
+	strlcpy(userdata->data, tag, userdata->userdata_len);	
+
+	fstrcpy(ip_str, inet_ntoa(ip));
+
+	DEBUG(6,("Registering name %s IP %s with WINS server %s using tag '%s'\n",
+		 nmb_namestr(nmbname), ip_str, inet_ntoa(wins_ip), tag));
+
+	if (queue_register_multihomed_name(unicast_subnet,
+					   register_name_response,
+					   register_name_timeout_response,
+					   success_fn,
+					   fail_fn,
+					   userdata,
+					   nmbname,
+					   nb_flags,
+					   ip,
+					   wins_ip) == NULL) {
+		DEBUG(0,("multihomed_register_one: Failed to send packet trying to register name %s IP %s\n", 
+			 nmb_namestr(nmbname), inet_ntoa(ip)));		
+	}
+
+	free(userdata);
+}
+
+/****************************************************************************
+ We have finished the registration of one IP and need to see if we have
+ any more IPs left to register with this group of wins server for this name.
+****************************************************************************/
+
+static void wins_next_registration(struct response_record *rrec)
+{
+	struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+	struct nmb_name *nmbname = &sent_nmb->question.question_name;
+	uint16_t nb_flags = get_nb_flags(sent_nmb->additional->rdata);
+	struct userdata_struct *userdata = rrec->userdata;
+	const char *tag;
+	struct in_addr last_ip;
+	struct subnet_record *subrec;
+
+	putip(&last_ip,&sent_nmb->additional->rdata[2]);
+
+	if (!userdata) {
+		/* it wasn't multi-homed */
+		return;
+	}
+
+	tag = (const char *)userdata->data;
+
+	for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
+		if (ip_equal_v4(last_ip, subrec->myip)) {
+			subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec);
+			break;
+		}
+	}
+
+	if (!subrec) {
+		/* no more to do! */
+		return;
+	}
+
+	switch (sent_nmb->header.opcode) {
+	case NMB_NAME_MULTIHOMED_REG_OPCODE:
+		multihomed_register_one(nmbname, nb_flags, NULL, NULL, subrec->myip, tag);
+		break;
+	case NMB_NAME_REFRESH_OPCODE_8:
+		queue_wins_refresh(nmbname, 
+				   register_name_response,
+				   register_name_timeout_response,
+				   nb_flags, subrec->myip, tag);
+		break;
+	}
+}
+
+/****************************************************************************
+ Try and register one of our names on the unicast subnet - multihomed.
+****************************************************************************/
+
+static void multihomed_register_name(struct nmb_name *nmbname, uint16_t nb_flags,
+				     register_name_success_function success_fn,
+				     register_name_fail_function fail_fn)
+{
+	/*
+	  If we are adding a group name, we just send multiple
+	  register name packets to the WINS server (this is an
+	  internet group name.
+
+	  If we are adding a unique name, We need first to add 
+	  our names to the unicast subnet namelist. This is 
+	  because when a WINS server receives a multihomed 
+	  registration request, the first thing it does is to 
+	  send a name query to the registering machine, to see 
+	  if it has put the name in it's local namelist.
+	  We need the name there so the query response code in
+	  nmbd_incomingrequests.c will find it.
+
+	  We are adding this name prematurely (we don't really
+	  have it yet), but as this is on the unicast subnet
+	  only we will get away with this (only the WINS server
+	  will ever query names from us on this subnet).
+	*/
+	int num_ips=0;
+	int i, t;
+	struct subnet_record *subrec;
+	char **wins_tags;
+	struct in_addr *ip_list;
+	unstring name;
+
+	for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) )
+		num_ips++;
+	
+	if((ip_list = SMB_MALLOC_ARRAY(struct in_addr, num_ips))==NULL) {
+		DEBUG(0,("multihomed_register_name: malloc fail !\n"));
+		return;
+	}
+
+	for (subrec = FIRST_SUBNET, i = 0; 
+	     subrec;
+	     subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec), i++ ) {
+		ip_list[i] = subrec->myip;
+	}
+
+	pull_ascii_nstring(name, sizeof(name), nmbname->name);
+	add_name_to_subnet(unicast_subnet, name, nmbname->name_type,
+			   nb_flags, lp_max_ttl(), SELF_NAME,
+			   num_ips, ip_list);
+
+	/* get the list of wins tags - we try to register for each of them */
+	wins_tags = wins_srv_tags();
+
+	/* Now try and register the name for each wins tag.  Note that
+	   at this point we only register our first IP with each wins
+	   group. We will register the rest from
+	   wins_next_registration() when we get the reply for this
+	   one. That follows the way W2K does things (tridge)
+	*/
+	for (t=0; wins_tags && wins_tags[t]; t++) {
+		multihomed_register_one(nmbname, nb_flags,
+					success_fn, fail_fn,
+					ip_list[0],
+					wins_tags[t]);
+	}
+
+	wins_srv_tags_free(wins_tags);
+	
+	SAFE_FREE(ip_list);
+}
+
+/****************************************************************************
+ Try and register one of our names.
+****************************************************************************/
+
+void register_name(struct subnet_record *subrec,
+                   const char *name, int type, uint16_t nb_flags,
+                   register_name_success_function success_fn,
+                   register_name_fail_function fail_fn,
+                   struct userdata_struct *userdata)
+{
+	struct nmb_name nmbname;
+	nstring nname;
+	size_t converted_size;
+
+	errno = 0;
+	converted_size = push_ascii_nstring(nname, name);
+	if (converted_size != (size_t)-1) {
+		/* Success. */
+		make_nmb_name(&nmbname, name, type);
+	} else if (errno == E2BIG) {
+		/*
+		 * Name converted to CH_DOS is too large.
+		 * try to truncate.
+		 */
+		char *converted_str_dos = NULL;
+		char *converted_str_unix = NULL;
+		bool ok;
+
+		converted_size = 0;
+
+		ok = convert_string_talloc(talloc_tos(),
+				CH_UNIX,
+				CH_DOS,
+				name,
+				strlen(name)+1,
+				&converted_str_dos,
+				&converted_size);
+		if (!ok) {
+			DEBUG(0,("register_name: NetBIOS name %s cannot be "
+				"converted. Failing to register name.\n",
+				name));
+			return;
+		}
+
+		/*
+		 * As it's now CH_DOS codepage
+		 * we truncate by writing '\0' at
+		 * MAX_NETBIOSNAME_LEN-1 and then
+		 * convert back to CH_UNIX which we
+		 * need for the make_nmb_name() call.
+		 */
+		if (converted_size >= MAX_NETBIOSNAME_LEN) {
+			converted_str_dos[MAX_NETBIOSNAME_LEN-1] = '\0';
+		}
+
+		ok = convert_string_talloc(talloc_tos(),
+				CH_DOS,
+				CH_UNIX,
+				converted_str_dos,
+				strlen(converted_str_dos)+1,
+				&converted_str_unix,
+				&converted_size);
+		if (!ok) {
+			DEBUG(0,("register_name: NetBIOS name %s cannot be "
+				"converted back to CH_UNIX. "
+				"Failing to register name.\n",
+				converted_str_dos));
+			TALLOC_FREE(converted_str_dos);
+			return;
+		}
+
+		make_nmb_name(&nmbname, converted_str_unix, type);
+
+		TALLOC_FREE(converted_str_dos);
+		TALLOC_FREE(converted_str_unix);
+	} else {
+		/*
+		 * Generic conversion error. Fail to register.
+		 */
+		DEBUG(0,("register_name: NetBIOS name %s cannot be "
+			"converted (%s). Failing to register name.\n",
+			name, strerror(errno)));
+		return;
+	}
+
+	/* Always set the NB_ACTIVE flag on the name we are
+	   registering. Doesn't make sense without it.
+	*/
+	
+	nb_flags |= NB_ACTIVE;
+	
+	if (subrec == unicast_subnet) {
+		/* we now always do multi-homed registration if we are
+		   registering to a WINS server. This copes much
+		   better with complex WINS setups */
+		multihomed_register_name(&nmbname, nb_flags,
+					 success_fn, fail_fn);
+		return;
+	}
+	
+	if (queue_register_name(subrec,
+				register_name_response,
+				register_name_timeout_response,
+				success_fn,
+				fail_fn,
+				userdata,
+				&nmbname,
+				nb_flags) == NULL) {
+		DEBUG(0,("register_name: Failed to send packet trying to register name %s\n",
+			 nmb_namestr(&nmbname)));
+	}
+}
+
+/****************************************************************************
+ Try and refresh one of our names. This is *only* called for WINS refresh
+****************************************************************************/
+
+void wins_refresh_name(struct name_record *namerec)
+{
+	int t;
+	char **wins_tags;
+
+	/* get the list of wins tags - we try to refresh for each of them */
+	wins_tags = wins_srv_tags();
+
+	for (t=0; wins_tags && wins_tags[t]; t++) {
+		queue_wins_refresh(&namerec->name, 
+				   register_name_response,
+				   register_name_timeout_response,
+				   namerec->data.nb_flags,
+				   namerec->data.ip[0], wins_tags[t]);
+	}
+
+	wins_srv_tags_free(wins_tags);
+}