xfrin.c revision 30be9a55be7e81d805de7cb696b2cbaf06a02350
/*
* Copyright (C) 1999 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* $Id: xfrin.c,v 1.20 1999/10/28 19:11:33 gson Exp $ */
#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/mem.h>
#include <isc/result.h>
#include <isc/timer.h>
#include <isc/net.h>
#include <dns/types.h>
#include <dns/result.h>
#include <dns/name.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/zone.h>
#include <dns/message.h>
#include <dns/tcpmsg.h>
#include <dns/events.h>
#include <dns/journal.h>
#include <dns/view.h>
#include <dns/tsig.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/globals.h>
#include <named/xfrin.h>
/*
* Incoming AXFR and IXFR.
*/
#define FAIL(code) do { result = (code); goto failure; } while (0)
#define CHECK(op) do { result = (op); \
if (result != DNS_R_SUCCESS) goto failure; \
} while (0)
typedef struct xfrin_ctx xfrin_ctx_t;
/*
* The states of the *XFR state machine. We handle both IXFR and AXFR
* with a single integrated state machine because they cannot be distinguished
* immediately - an AXFR response to an IXFR request can only be detected
* when the first two (2) response RRs have already been received.
*/
typedef enum {
XFRST_INITIALSOA,
XFRST_FIRSTDATA,
XFRST_IXFR_DELSOA,
XFRST_IXFR_DEL,
XFRST_IXFR_ADDSOA,
XFRST_IXFR_ADD,
XFRST_AXFR,
XFRST_END
} xfrin_state_t;
/*
* Incoming zone transfer context.
*/
struct xfrin_ctx {
isc_mem_t *mctx;
dns_zone_t *zone;
isc_task_t *task;
isc_timer_t *timer;
isc_socketmgr_t *socketmgr;
int recvs; /* Number of receives in progress */
int tasks; /* Number of active tasks (0 or 1) */
dns_name_t name; /* Name of zone to transfer */
dns_rdataclass_t rdclass;
/*
* Requested transfer type (dns_rdatatype_axfr or
* dns_rdatatype_ixfr). The actual transfer type
* may differ due to IXFR->AXFR fallback.
*/
dns_rdatatype_t reqtype;
isc_sockaddr_t sockaddr;
isc_socket_t *socket;
/* Buffer for IXFR/AXFR request message */
isc_buffer_t qbuffer;
unsigned char qbuffer_data[512];
/* Incoming reply TCP message */
dns_tcpmsg_t tcpmsg;
isc_boolean_t tcpmsg_valid;
dns_db_t *db;
dns_dbversion_t *ver;
dns_diff_t diff; /* Pending database changes */
int difflen; /* Number of pending tuples */
xfrin_state_t state;
isc_uint32_t end_serial;
isc_boolean_t is_ixfr;
unsigned int nmsg; /* Number of messages recvd */
dns_tsigkey_t *tsigkey; /* Key used to create TSIG */
dns_rdata_any_tsig_t *lasttsig; /* The last TSIG */
void *tsigctx; /* TSIG verification context */
unsigned int sincetsig; /* recvd since the last TSIG */
/*
* AXFR- and IXFR-specific data. Only one is used at a time
* according to the is_ixfr flag, so this could be a union,
* but keeping them separate makes it a bit simpler to clean
* things up when destroying the context.
*/
struct {
dns_addrdatasetfunc_t add_func;
dns_dbload_t *add_private;
} axfr;
struct {
isc_uint32_t request_serial;
isc_uint32_t end_serial;
dns_journal_t *journal;
} ixfr;
};
/**************************************************************************/
/*
* Forward declarations.
*/
static dns_result_t
xfrin_create(isc_mem_t *mctx,
dns_zone_t *zone,
dns_db_t *db,
isc_task_t *task,
isc_socketmgr_t *socketmgr,
dns_name_t *zonename,
dns_rdataclass_t rdclass,
dns_rdatatype_t reqtype,
isc_sockaddr_t *master,
dns_tsigkey_t *tsigkey,
xfrin_ctx_t **xfrp);
static dns_result_t axfr_init(xfrin_ctx_t *xfr);
static dns_result_t axfr_makedb(xfrin_ctx_t *xfr, dns_db_t **dbp);
static dns_result_t axfr_putdata(xfrin_ctx_t *xfr, dns_diffop_t op,
dns_name_t *name, dns_ttl_t ttl,
dns_rdata_t *rdata);
static dns_result_t axfr_apply(xfrin_ctx_t *xfr);
static dns_result_t axfr_commit(xfrin_ctx_t *xfr);
static dns_result_t ixfr_init(xfrin_ctx_t *xfr);
static dns_result_t ixfr_apply(xfrin_ctx_t *xfr);
static dns_result_t ixfr_putdata(xfrin_ctx_t *xfr, dns_diffop_t op,
dns_name_t *name, dns_ttl_t ttl,
dns_rdata_t *rdata);
static dns_result_t ixfr_commit(xfrin_ctx_t *xfr);
static dns_result_t xfr_rr(xfrin_ctx_t *xfr, dns_name_t *name,
isc_uint32_t ttl, dns_rdata_t *rdata);
void xfrin_start(xfrin_ctx_t *xfr);
static void xfrin_connect_done(isc_task_t *task, isc_event_t *event);
static dns_result_t xfrin_send_request(xfrin_ctx_t *xfr);
static void xfrin_send_done(isc_task_t *task, isc_event_t *event);
static void xfrin_sendlen_done(isc_task_t *task, isc_event_t *event);
static void xfrin_recv_done(isc_task_t *task, isc_event_t *event);
static void xfrin_timeout(isc_task_t *task, isc_event_t *event);
static void xfrin_shutdown(isc_task_t *task, isc_event_t *event);
static isc_boolean_t maybe_free(xfrin_ctx_t *xfr);
static void xfrin_fail(xfrin_ctx_t *xfr, isc_result_t result, char *msg);
static dns_result_t render(dns_message_t *msg, isc_buffer_t *buf);
/**************************************************************************/
/*
* AXFR handling
*/
static dns_result_t
axfr_init(xfrin_ctx_t *xfr) {
dns_result_t result;
xfr->is_ixfr = ISC_FALSE;
if (xfr->db != NULL)
dns_db_detach(&xfr->db);
CHECK(axfr_makedb(xfr, &xfr->db));
CHECK(dns_db_beginload(xfr->db, &xfr->axfr.add_func,
&xfr->axfr.add_private));
result = DNS_R_SUCCESS;
failure:
return (result);
}
static dns_result_t
axfr_makedb(xfrin_ctx_t *xfr, dns_db_t **dbp) {
return (dns_db_create(xfr->mctx, /* XXX */
"rbt", /* XXX guess */
&xfr->name,
ISC_FALSE,
xfr->rdclass,
0, NULL, /* XXX guess */
dbp));
}
static dns_result_t
axfr_putdata(xfrin_ctx_t *xfr, dns_diffop_t op,
dns_name_t *name, dns_ttl_t ttl, dns_rdata_t *rdata)
{
dns_result_t result;
dns_difftuple_t *tuple = NULL;
CHECK(dns_difftuple_create(xfr->diff.mctx, op,
name, ttl, rdata, &tuple));
dns_diff_append(&xfr->diff, &tuple);
if (++xfr->difflen > 100)
CHECK(axfr_apply(xfr));
result = DNS_R_SUCCESS;
failure:
return (result);
}
/* Store a set of AXFR RRs in the database. */
static dns_result_t
axfr_apply(xfrin_ctx_t *xfr) {
dns_result_t result;
CHECK(dns_diff_load(&xfr->diff,
xfr->axfr.add_func, xfr->axfr.add_private));
xfr->difflen = 0;
dns_diff_clear(&xfr->diff);
result = DNS_R_SUCCESS;
failure:
return (result);
}
static dns_result_t
axfr_commit(xfrin_ctx_t *xfr) {
dns_result_t result;
CHECK(axfr_apply(xfr));
CHECK(dns_db_endload(xfr->db, &xfr->axfr.add_private));
CHECK(dns_zone_replacedb(xfr->zone, xfr->db, ISC_TRUE));
result = ISC_R_SUCCESS;
failure:
printf("axfr_commit returns status %s\n", isc_result_totext(result));
return (result);
}
/**************************************************************************/
/*
* IXFR handling
*/
static dns_result_t
ixfr_init(xfrin_ctx_t *xfr) {
dns_result_t result;
xfr->is_ixfr = ISC_TRUE;
INSIST(xfr->db != NULL);
xfr->difflen = 0;
CHECK(dns_journal_open(xfr->mctx, dns_zone_getixfrlog(xfr->zone),
ISC_TRUE, &xfr->ixfr.journal));
result = DNS_R_SUCCESS;
failure:
return (result);
}
static dns_result_t
ixfr_putdata(xfrin_ctx_t *xfr, dns_diffop_t op,
dns_name_t *name, dns_ttl_t ttl, dns_rdata_t *rdata)
{
dns_result_t result;
dns_difftuple_t *tuple = NULL;
CHECK(dns_difftuple_create(xfr->diff.mctx, op,
name, ttl, rdata, &tuple));
dns_diff_append(&xfr->diff, &tuple);
if (++xfr->difflen > 100)
CHECK(ixfr_apply(xfr));
result = DNS_R_SUCCESS;
failure:
return (result);
}
/* Apply a set of IXFR changes to the database. */
static dns_result_t
ixfr_apply(xfrin_ctx_t *xfr) {
dns_result_t result;
if (xfr->ver == NULL) {
CHECK(dns_db_newversion(xfr->db, &xfr->ver));
CHECK(dns_journal_begin_transaction(xfr->ixfr.journal));
}
CHECK(dns_diff_apply(&xfr->diff, xfr->db, xfr->ver));
dns_journal_writediff(xfr->ixfr.journal, &xfr->diff);
dns_diff_clear(&xfr->diff);
xfr->difflen = 0;
result = DNS_R_SUCCESS;
failure:
return (result);
}
static dns_result_t
ixfr_commit(xfrin_ctx_t *xfr) {
dns_result_t result;
ixfr_apply(xfr);
if (xfr->ver != NULL) {
/* XXX enter ready-to-commit state here */
CHECK(dns_journal_commit(xfr->ixfr.journal));
dns_db_closeversion(xfr->db, &xfr->ver, ISC_TRUE);
}
result = DNS_R_SUCCESS;
failure:
return (result);
}
/**************************************************************************/
/*
* Common AXFR/IXFR protocol code
*/
/*
* Handle a single incoming resource record according to the current
* state.
*/
static dns_result_t
xfr_rr(xfrin_ctx_t *xfr,
dns_name_t *name, isc_uint32_t ttl, dns_rdata_t *rdata)
{
dns_result_t result;
redo:
switch (xfr->state) {
case XFRST_INITIALSOA:
INSIST(rdata->type == dns_rdatatype_soa);
/*
* Remember the serial number in the intial SOA.
* We need it to recognize the end of an IXFR.
*/
xfr->end_serial = dns_soa_getserial(rdata);
if (xfr->reqtype == dns_rdatatype_ixfr &&
! DNS_SERIAL_GT(xfr->end_serial, xfr->ixfr.request_serial))
{
/*
* This must be the single SOA record that is
* sent when the current version on the master
* is not newer than the version in the request.
*/
printf("requested %u, master has %u, not updating\n",
xfr->ixfr.request_serial, xfr->end_serial);
FAIL(DNS_R_UPTODATE);
}
xfr->state = XFRST_FIRSTDATA;
break;
case XFRST_FIRSTDATA:
/*
* If the transfer begins with one SOA record, it is an AXFR,
* if it begins with two SOAs, it is an IXFR.
*/
if (rdata->type == dns_rdatatype_soa) {
CHECK(ixfr_init(xfr));
xfr->state = XFRST_IXFR_DELSOA;
} else {
CHECK(axfr_init(xfr));
xfr->state = XFRST_AXFR;
}
goto redo;
case XFRST_IXFR_DELSOA:
INSIST(rdata->type == dns_rdatatype_soa);
CHECK(ixfr_putdata(xfr, DNS_DIFFOP_DEL, name, ttl, rdata));
xfr->state = XFRST_IXFR_DEL;
break;
case XFRST_IXFR_DEL:
if (rdata->type == dns_rdatatype_soa) {
isc_uint32_t soa_serial = dns_soa_getserial(rdata);
xfr->state = XFRST_IXFR_ADDSOA;
xfr->ixfr.end_serial = soa_serial;
goto redo;
}
CHECK(ixfr_putdata(xfr, DNS_DIFFOP_DEL, name, ttl, rdata));
break;
case XFRST_IXFR_ADDSOA:
INSIST(rdata->type == dns_rdatatype_soa);
CHECK(ixfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata));
xfr->state = XFRST_IXFR_ADD;
break;
case XFRST_IXFR_ADD:
if (rdata->type == dns_rdatatype_soa) {
isc_uint32_t soa_serial = dns_soa_getserial(rdata);
CHECK(ixfr_commit(xfr));
if (soa_serial == xfr->end_serial) {
xfr->state = XFRST_END;
break;
} else {
xfr->state = XFRST_IXFR_DELSOA;
goto redo;
}
}
CHECK(ixfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata));
break;
case XFRST_AXFR:
CHECK(axfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata));
if (rdata->type == dns_rdatatype_soa) {
CHECK(axfr_commit(xfr));
xfr->state = XFRST_END;
break;
}
break;
case XFRST_END:
FAIL(DNS_R_EXTRADATA);
default:
INSIST(0);
break;
}
result = DNS_R_SUCCESS;
failure:
return (result);
}
void
ns_xfrin_start(dns_zone_t *zone, isc_sockaddr_t *master) {
dns_name_t *zonename;
isc_task_t *task;
xfrin_ctx_t *xfr;
dns_result_t result;
dns_db_t *db = NULL;
dns_rdatatype_t xfrtype;
dns_tsigkey_t *key = NULL;
printf("attempting zone transfer\n");
zonename = dns_zone_getorigin(zone);
result = dns_zone_getdb(zone, &db);
if (result == DNS_R_NOTLOADED)
INSIST(db == NULL);
else
CHECK(result);
task = NULL;
RUNTIME_CHECK(isc_task_create(ns_g_taskmgr, ns_g_mctx, 0, &task)
== DNS_R_SUCCESS);
if (db == NULL) {
printf("no database exists, trying to create with axfr\n");
xfrtype = dns_rdatatype_axfr;
} else {
printf("database exists, trying ixfr\n");
xfrtype = dns_rdatatype_ixfr;
}
CHECK(xfrin_create(ns_g_mctx,
zone,
db,
task,
ns_g_socketmgr,
zonename,
dns_rdataclass_in, xfrtype,
master, key, &xfr));
xfrin_start(xfr);
if (db != NULL)
dns_db_detach(&db);
return;
failure:
if (db != NULL)
dns_db_detach(&db);
printf("zone transfer setup failed\n");
return;
}
static void xfrin_cleanup(xfrin_ctx_t *xfr) {
printf("end of zone transfer - destroying task %p\n", xfr->task);
isc_socket_cancel(xfr->socket, xfr->task, ISC_SOCKSHUT_ALL); /* XXX? */
isc_socket_detach(&xfr->socket);
isc_timer_detach(&xfr->timer);
isc_task_destroy(&xfr->task);
if (xfr->lasttsig != NULL) {
dns_rdata_freestruct(xfr->lasttsig);
isc_mem_put(xfr->mctx, xfr->lasttsig, sizeof(*xfr->lasttsig));
}
/* The rest will be done when the task runs its shutdown event. */
}
static void
xfrin_fail(xfrin_ctx_t *xfr, isc_result_t result, char *msg) {
if (result != DNS_R_UPTODATE) {
printf("error in incoming zone transfer: %s: %s\n",
msg, isc_result_totext(result));
}
xfrin_cleanup(xfr);
}
static dns_result_t
xfrin_create(isc_mem_t *mctx,
dns_zone_t *zone,
dns_db_t *db,
isc_task_t *task,
isc_socketmgr_t *socketmgr,
dns_name_t *zonename,
dns_rdataclass_t rdclass,
dns_rdatatype_t reqtype,
isc_sockaddr_t *master,
dns_tsigkey_t *tsigkey,
xfrin_ctx_t **xfrp)
{
xfrin_ctx_t *xfr = NULL;
isc_result_t result;
isc_interval_t interval;
xfr = isc_mem_get(mctx, sizeof(*xfr));
if (xfr == NULL)
return (DNS_R_NOMEMORY);
xfr->mctx = mctx;
xfr->zone = NULL;
dns_zone_attach(zone, &xfr->zone);
xfr->task = task;
xfr->timer = NULL;
xfr->socketmgr = socketmgr;
xfr->recvs = 0;
xfr->tasks = 1;
dns_name_init(&xfr->name, NULL);
xfr->rdclass = rdclass;
xfr->reqtype = reqtype;
/* sockaddr */
xfr->socket = NULL;
/* qbuffer */
/* qbuffer_data */
/* tcpmsg */
xfr->tcpmsg_valid = ISC_FALSE;
xfr->db = NULL;
if (db != NULL)
dns_db_attach(db, &xfr->db);
xfr->ver = NULL;
dns_diff_init(xfr->mctx, &xfr->diff);
xfr->difflen = 0;
xfr->state = XFRST_INITIALSOA;
/* end_serial */
xfr->nmsg = 0;
xfr->tsigkey = tsigkey;
xfr->lasttsig = NULL;
xfr->tsigctx = NULL;
xfr->sincetsig = 0;
/* is_ixfr */
/* ixfr.request_serial */
/* ixfr.end_serial */
xfr->ixfr.journal = NULL;
xfr->axfr.add_func = NULL;
xfr->axfr.add_private = NULL;
isc_task_onshutdown(xfr->task, xfrin_shutdown, xfr);
CHECK(dns_name_dup(zonename, mctx, &xfr->name));
isc_interval_set(&interval, 3600, 0); /* XXX */
CHECK(isc_timer_create(ns_g_timermgr, isc_timertype_once,
NULL, &interval, task,
xfrin_timeout, xfr, &xfr->timer));
xfr->sockaddr = *master;
isc_buffer_init(&xfr->qbuffer, xfr->qbuffer_data,
sizeof(xfr->qbuffer_data),
ISC_BUFFERTYPE_BINARY);
*xfrp = xfr;
return (DNS_R_SUCCESS);
failure:
xfrin_cleanup(xfr);
return (result);
}
void
xfrin_start(xfrin_ctx_t *xfr) {
dns_result_t result;
CHECK(isc_socket_create(xfr->socketmgr,
isc_sockaddr_pf(&xfr->sockaddr),
isc_sockettype_tcp,
&xfr->socket));
CHECK(isc_socket_connect(xfr->socket, &xfr->sockaddr, xfr->task,
xfrin_connect_done, xfr));
return;
failure:
xfrin_fail(xfr, result, "setting up socket");
}
/* XXX the resolver could use this, too */
static dns_result_t
render(dns_message_t *msg, isc_buffer_t *buf) {
dns_result_t result;
CHECK(dns_message_renderbegin(msg, buf));
CHECK(dns_message_rendersection(msg, DNS_SECTION_QUESTION, 0, 0));
CHECK(dns_message_rendersection(msg, DNS_SECTION_ANSWER, 0, 0));
CHECK(dns_message_rendersection(msg, DNS_SECTION_AUTHORITY, 0, 0));
CHECK(dns_message_rendersection(msg, DNS_SECTION_ADDITIONAL, 0, 0));
CHECK(dns_message_rendersection(msg, DNS_SECTION_TSIG, 0, 0));
CHECK(dns_message_renderend(msg));
result = DNS_R_SUCCESS;
failure:
return (result);
}
/*
* A connection has been established.
*/
static void
xfrin_connect_done(isc_task_t *task, isc_event_t *event) {
isc_socket_connev_t *cev = (isc_socket_connev_t *) event;
xfrin_ctx_t *xfr = (xfrin_ctx_t *) event->arg;
dns_result_t result;
task = task; /* Unused */
INSIST(event->type == ISC_SOCKEVENT_CONNECT);
printf("connected\n");
CHECK(cev->result);
dns_tcpmsg_init(xfr->mctx, xfr->socket, &xfr->tcpmsg);
xfr->tcpmsg_valid = ISC_TRUE;
CHECK(xfrin_send_request(xfr));
isc_event_free(&event);
return;
failure:
isc_event_free(&event);
xfrin_fail(xfr, result, "connecting");
}
/*
* Convert a tuple into a dns_name_t suitable for inserting
* into the given dns_message_t.
*/
static isc_result_t
tuple2msgname(dns_difftuple_t *tuple, dns_message_t *msg, dns_name_t **target)
{
dns_result_t result;
dns_rdata_t *rdata = NULL;
dns_rdatalist_t *rdl = NULL;
dns_rdataset_t *rds = NULL;
dns_name_t *name = NULL;
REQUIRE(target != NULL && *target == NULL);
CHECK(dns_message_gettemprdata(msg, &rdata));
dns_rdata_init(rdata);
*rdata = tuple->rdata; /* Struct assignment. */
CHECK(dns_message_gettemprdatalist(msg, &rdl));
dns_rdatalist_init(rdl);
rdl->type = tuple->rdata.type;
rdl->rdclass = tuple->rdata.rdclass;
rdl->ttl = tuple->ttl;
ISC_LIST_APPEND(rdl->rdata, rdata, link);
CHECK(dns_message_gettemprdataset(msg, &rds));
dns_rdataset_init(rds);
CHECK(dns_rdatalist_tordataset(rdl, rds));
CHECK(dns_message_gettempname(msg, &name));
dns_name_init(name, NULL);
dns_name_clone(&tuple->name, name);
ISC_LIST_APPEND(name->list, rds, link);
*target = name;
failure:
return (result);
}
/*
* Build an *XFR request and send its length prefix.
*/
static dns_result_t
xfrin_send_request(xfrin_ctx_t *xfr) {
dns_result_t result;
isc_region_t region;
isc_region_t lregion;
dns_rdataset_t *qrdataset = NULL;
dns_message_t *msg = NULL;
unsigned char length[2];
dns_difftuple_t *soatuple = NULL;
dns_name_t *qname = NULL;
dns_dbversion_t *ver = NULL;
dns_name_t *msgsoaname;
/* Create the request message */
CHECK(dns_message_create(xfr->mctx, DNS_MESSAGE_INTENTRENDER, &msg));
msg->tsigkey = xfr->tsigkey;
/* Create a name for the question section. */
dns_message_gettempname(msg, &qname);
dns_name_init(qname, NULL);
dns_name_clone(&xfr->name, qname);
/* Formulate the question and attach it to the question name. */
dns_message_gettemprdataset(msg, &qrdataset);
dns_rdataset_init(qrdataset);
dns_rdataset_makequestion(qrdataset, xfr->rdclass, xfr->reqtype);
ISC_LIST_APPEND(qname->list, qrdataset, link);
dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
if (xfr->reqtype == dns_rdatatype_ixfr) {
/* Get the SOA and add it to the authority section. */
/* XXX is using the current version the right thing? */
dns_db_currentversion(xfr->db, &ver);
CHECK(dns_db_createsoatuple(xfr->db, ver, xfr->mctx,
DNS_DIFFOP_EXISTS, &soatuple));
xfr->ixfr.request_serial = dns_soa_getserial(&soatuple->rdata);
printf("requesting IXFR for serial %u\n",
xfr->ixfr.request_serial);
CHECK(tuple2msgname(soatuple, msg, &msgsoaname));
dns_message_addname(msg, msgsoaname, DNS_SECTION_AUTHORITY);
}
msg->id = ('b' << 8) | '9'; /* Arbitrary */
CHECK(render(msg, &xfr->qbuffer));
/* Save the query TSIG and don't let message_destroy free it */
xfr->lasttsig = msg->tsig;
msg->tsig = NULL;
isc_buffer_used(&xfr->qbuffer, &region);
INSIST(region.length <= 65535);
length[0] = region.length >> 8;
length[1] = region.length & 0xFF;
lregion.base = length;
lregion.length = 2;
CHECK(isc_socket_send(xfr->socket, &lregion, xfr->task,
xfrin_sendlen_done, xfr));
failure:
if (msg != NULL)
dns_message_destroy(&msg);
if (soatuple != NULL)
dns_difftuple_free(&soatuple);
if (ver != NULL)
dns_db_closeversion(xfr->db, &ver, ISC_FALSE);
return (result);
}
/* XXX there should be library support for sending DNS TCP messages */
static void
xfrin_sendlen_done(isc_task_t *task, isc_event_t *event)
{
isc_socketevent_t *sev = (isc_socketevent_t *) event;
xfrin_ctx_t *xfr = (xfrin_ctx_t *) event->arg;
dns_result_t result;
isc_region_t region;
task = task; /* Unused */
INSIST(event->type == ISC_SOCKEVENT_SENDDONE);
printf("sendlen done\n");
CHECK(sev->result);
isc_buffer_used(&xfr->qbuffer, &region);
CHECK(isc_socket_send(xfr->socket, &region, xfr->task,
xfrin_send_done, xfr));
isc_event_free(&event);
return;
failure:
isc_event_free(&event);
xfrin_fail(xfr, result, "sending request length prefix");
}
static void
xfrin_send_done(isc_task_t *task, isc_event_t *event)
{
isc_socketevent_t *sev = (isc_socketevent_t *) event;
xfrin_ctx_t *xfr = (xfrin_ctx_t *) event->arg;
dns_result_t result;
task = task; /* Unused */
INSIST(event->type == ISC_SOCKEVENT_SENDDONE);
printf("send done\n");
CHECK(sev->result);
CHECK(dns_tcpmsg_readmessage(&xfr->tcpmsg, xfr->task,
xfrin_recv_done, xfr));
xfr->recvs++;
isc_event_free(&event);
return;
failure:
isc_event_free(&event);
xfrin_fail(xfr, result, "sending request");
}
static void
xfrin_recv_done(isc_task_t *task, isc_event_t *ev) {
xfrin_ctx_t *xfr = (xfrin_ctx_t *) ev->arg;
dns_result_t result;
dns_message_t *msg = NULL;
dns_name_t *name;
dns_tcpmsg_t *tcpmsg;
task = task; /* Unused */
INSIST(ev->type == DNS_EVENT_TCPMSG);
tcpmsg = ev->sender;
isc_event_free(&ev);
printf("received TCP message of %u bytes\n",
tcpmsg->buffer.used);
xfr->recvs--;
if (maybe_free(xfr))
return;
CHECK(tcpmsg->result);
CHECK(isc_timer_touch(xfr->timer));
CHECK(dns_message_create(xfr->mctx, DNS_MESSAGE_INTENTPARSE, &msg));
msg->tsigkey = xfr->tsigkey;
msg->querytsig = xfr->lasttsig;
msg->tsigctx = xfr->tsigctx;
if (xfr->nmsg > 0)
msg->tcp_continuation = 1;
CHECK(dns_message_parse(msg, &tcpmsg->buffer, ISC_TRUE));
if (msg->rcode != dns_rcode_noerror) {
result = ISC_RESULTCLASS_DNSRCODE + msg->rcode; /* XXX */
if (xfr->reqtype == dns_rdatatype_axfr)
FAIL(result);
printf("got %s, retrying with AXFR\n",
isc_result_totext(result));
dns_message_destroy(&msg);
xfr->reqtype = dns_rdatatype_axfr;
CHECK(xfrin_send_request(xfr));
return;
}
for (result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
result == DNS_R_SUCCESS;
result = dns_message_nextname(msg, DNS_SECTION_ANSWER))
{
dns_rdataset_t *rds;
name = NULL;
dns_message_currentname(msg, DNS_SECTION_ANSWER, &name);
for (rds = ISC_LIST_HEAD(name->list);
rds != NULL;
rds = ISC_LIST_NEXT(rds, link))
{
for (result = dns_rdataset_first(rds);
result == DNS_R_SUCCESS;
result = dns_rdataset_next(rds))
{
dns_rdata_t rdata;
dns_rdataset_current(rds, &rdata);
CHECK(xfr_rr(xfr, name, rds->ttl, &rdata));
}
}
}
if (result != DNS_R_NOMORE)
goto failure;
if (msg->tsig != NULL) {
/* Reset the counter */
xfr->sincetsig = 0;
/* Free the last tsig, if there is one */
if (xfr->lasttsig != NULL) {
dns_rdata_freestruct(xfr->lasttsig);
isc_mem_put(xfr->mctx, xfr->lasttsig,
sizeof(*xfr->lasttsig));
}
/* Update the last tsig pointer */
xfr->lasttsig = msg->tsig;
/* Reset msg->tsig so it doesn't get freed */
msg->tsig = NULL;
} else if (msg->tsigkey != NULL) {
xfr->sincetsig++;
if (xfr->sincetsig > 100 ||
xfr->nmsg == 0 || xfr->state == XFRST_END)
{
result = DNS_R_EXPECTEDTSIG;
goto failure;
}
}
/* Update the number of messages received */
xfr->nmsg++;
/* Reset msg->querytsig so it doesn't get freed */
msg->querytsig = NULL;
/* Copy the context back */
xfr->tsigctx = msg->tsigctx;
dns_message_destroy(&msg);
if (xfr->state == XFRST_END) {
xfrin_cleanup(xfr);
} else {
/* Read the next message. */
CHECK(dns_tcpmsg_readmessage(&xfr->tcpmsg, xfr->task,
xfrin_recv_done, xfr));
xfr->recvs++;
}
return;
failure:
if (msg != NULL) {
msg->querytsig = NULL;
dns_message_destroy(&msg);
}
xfrin_fail(xfr, result, "receving responses");
}
static void
xfrin_timeout(isc_task_t *task, isc_event_t *event) {
xfrin_ctx_t *xfr = (xfrin_ctx_t *) event->arg;
task = task; /* Unused */
INSIST(event->type == ISC_TIMEREVENT_IDLE);
isc_event_free(&event);
xfrin_fail(xfr, ISC_R_TIMEDOUT, "giving up");
}
static void
xfrin_shutdown(isc_task_t *task, isc_event_t *event) {
xfrin_ctx_t *xfr = (xfrin_ctx_t *) event->arg;
task = task; /* Unused */
INSIST(event->type == ISC_TASKEVENT_SHUTDOWN);
isc_event_free(&event);
printf("xfrin_shutdown task=%p\n", task);
xfr->tasks--;
maybe_free(xfr);
}
static isc_boolean_t
maybe_free(xfrin_ctx_t *xfr) {
INSIST(xfr->tasks >= 0);
INSIST(xfr->recvs >= 0);
if (xfr->tasks != 0 || xfr->recvs != 0)
return (ISC_FALSE);
printf("freeing xfrin context\n");
dns_diff_clear(&xfr->diff);
if (xfr->ixfr.journal != NULL)
dns_journal_destroy(&xfr->ixfr.journal);
if (xfr->axfr.add_private != NULL)
(void) dns_db_endload(xfr->db, &xfr->axfr.add_private);
if (xfr->tcpmsg_valid)
dns_tcpmsg_invalidate(&xfr->tcpmsg);
if ((xfr->name.attributes & DNS_NAMEATTR_DYNAMIC) != 0)
dns_name_free(&xfr->name, xfr->mctx);
if (xfr->ver != NULL)
dns_db_closeversion(xfr->db, &xfr->ver, ISC_FALSE);
if (xfr->db != NULL)
dns_db_detach(&xfr->db);
if (xfr->zone != NULL)
dns_zone_detach(&xfr->zone);
isc_mem_put(xfr->mctx, xfr, sizeof(*xfr));
printf("xfrin_shutdown done\n");
return (ISC_TRUE);
}