diff options
Diffstat (limited to 'contrib/bind9/lib/dns/dispatch.c')
| -rw-r--r-- | contrib/bind9/lib/dns/dispatch.c | 2199 |
1 files changed, 0 insertions, 2199 deletions
diff --git a/contrib/bind9/lib/dns/dispatch.c b/contrib/bind9/lib/dns/dispatch.c deleted file mode 100644 index 8534fe15ad108..0000000000000 --- a/contrib/bind9/lib/dns/dispatch.c +++ /dev/null @@ -1,2199 +0,0 @@ -/* - * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") - * Copyright (C) 1999-2003 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 ISC DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS. IN NO EVENT SHALL ISC 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: dispatch.c,v 1.101.2.6.2.10 2004/09/01 04:27:41 marka Exp $ */ - -#include <config.h> - -#include <stdlib.h> - -#include <isc/entropy.h> -#include <isc/lfsr.h> -#include <isc/mem.h> -#include <isc/mutex.h> -#include <isc/print.h> -#include <isc/string.h> -#include <isc/task.h> -#include <isc/util.h> - -#include <dns/acl.h> -#include <dns/dispatch.h> -#include <dns/events.h> -#include <dns/log.h> -#include <dns/message.h> -#include <dns/portlist.h> -#include <dns/tcpmsg.h> -#include <dns/types.h> - -typedef ISC_LIST(dns_dispentry_t) dns_displist_t; - -typedef struct dns_qid { - unsigned int magic; - unsigned int qid_nbuckets; /* hash table size */ - unsigned int qid_increment; /* id increment on collision */ - isc_mutex_t lock; - isc_lfsr_t qid_lfsr1; /* state generator info */ - isc_lfsr_t qid_lfsr2; /* state generator info */ - dns_displist_t *qid_table; /* the table itself */ -} dns_qid_t; - -struct dns_dispatchmgr { - /* Unlocked. */ - unsigned int magic; - isc_mem_t *mctx; - dns_acl_t *blackhole; - dns_portlist_t *portlist; - - /* Locked by "lock". */ - isc_mutex_t lock; - unsigned int state; - ISC_LIST(dns_dispatch_t) list; - - /* locked by buffer lock */ - dns_qid_t *qid; - isc_mutex_t buffer_lock; - unsigned int buffers; /* allocated buffers */ - unsigned int buffersize; /* size of each buffer */ - unsigned int maxbuffers; /* max buffers */ - - /* Locked internally. */ - isc_mutex_t pool_lock; - isc_mempool_t *epool; /* memory pool for events */ - isc_mempool_t *rpool; /* memory pool for replies */ - isc_mempool_t *dpool; /* dispatch allocations */ - isc_mempool_t *bpool; /* memory pool for buffers */ - - isc_entropy_t *entropy; /* entropy source */ -}; - -#define MGR_SHUTTINGDOWN 0x00000001U -#define MGR_IS_SHUTTINGDOWN(l) (((l)->state & MGR_SHUTTINGDOWN) != 0) - -#define IS_PRIVATE(d) (((d)->attributes & DNS_DISPATCHATTR_PRIVATE) != 0) - -struct dns_dispentry { - unsigned int magic; - dns_dispatch_t *disp; - dns_messageid_t id; - unsigned int bucket; - isc_sockaddr_t host; - isc_task_t *task; - isc_taskaction_t action; - void *arg; - isc_boolean_t item_out; - ISC_LIST(dns_dispatchevent_t) items; - ISC_LINK(dns_dispentry_t) link; -}; - -#define INVALID_BUCKET (0xffffdead) - -struct dns_dispatch { - /* Unlocked. */ - unsigned int magic; /* magic */ - dns_dispatchmgr_t *mgr; /* dispatch manager */ - isc_task_t *task; /* internal task */ - isc_socket_t *socket; /* isc socket attached to */ - isc_sockaddr_t local; /* local address */ - unsigned int maxrequests; /* max requests */ - isc_event_t *ctlevent; - - /* Locked by mgr->lock. */ - ISC_LINK(dns_dispatch_t) link; - - /* Locked by "lock". */ - isc_mutex_t lock; /* locks all below */ - isc_sockettype_t socktype; - unsigned int attributes; - unsigned int refcount; /* number of users */ - dns_dispatchevent_t *failsafe_ev; /* failsafe cancel event */ - unsigned int shutting_down : 1, - shutdown_out : 1, - connected : 1, - tcpmsg_valid : 1, - recv_pending : 1; /* is a recv() pending? */ - isc_result_t shutdown_why; - unsigned int requests; /* how many requests we have */ - unsigned int tcpbuffers; /* allocated buffers */ - dns_tcpmsg_t tcpmsg; /* for tcp streams */ - dns_qid_t *qid; -}; - -#define QID_MAGIC ISC_MAGIC('Q', 'i', 'd', ' ') -#define VALID_QID(e) ISC_MAGIC_VALID((e), QID_MAGIC) - -#define RESPONSE_MAGIC ISC_MAGIC('D', 'r', 's', 'p') -#define VALID_RESPONSE(e) ISC_MAGIC_VALID((e), RESPONSE_MAGIC) - -#define DISPATCH_MAGIC ISC_MAGIC('D', 'i', 's', 'p') -#define VALID_DISPATCH(e) ISC_MAGIC_VALID((e), DISPATCH_MAGIC) - -#define DNS_DISPATCHMGR_MAGIC ISC_MAGIC('D', 'M', 'g', 'r') -#define VALID_DISPATCHMGR(e) ISC_MAGIC_VALID((e), DNS_DISPATCHMGR_MAGIC) - -#define DNS_QID(disp) ((disp)->socktype == isc_sockettype_tcp) ? \ - (disp)->qid : (disp)->mgr->qid -/* - * Statics. - */ -static dns_dispentry_t *bucket_search(dns_qid_t *, isc_sockaddr_t *, - dns_messageid_t, unsigned int); -static isc_boolean_t destroy_disp_ok(dns_dispatch_t *); -static void destroy_disp(isc_task_t *task, isc_event_t *event); -static void udp_recv(isc_task_t *, isc_event_t *); -static void tcp_recv(isc_task_t *, isc_event_t *); -static void startrecv(dns_dispatch_t *); -static dns_messageid_t dns_randomid(dns_qid_t *); -static isc_uint32_t dns_hash(dns_qid_t *, isc_sockaddr_t *, dns_messageid_t); -static void free_buffer(dns_dispatch_t *disp, void *buf, unsigned int len); -static void *allocate_udp_buffer(dns_dispatch_t *disp); -static inline void free_event(dns_dispatch_t *disp, dns_dispatchevent_t *ev); -static inline dns_dispatchevent_t *allocate_event(dns_dispatch_t *disp); -static void do_cancel(dns_dispatch_t *disp); -static dns_dispentry_t *linear_first(dns_qid_t *disp); -static dns_dispentry_t *linear_next(dns_qid_t *disp, - dns_dispentry_t *resp); -static void dispatch_free(dns_dispatch_t **dispp); -static isc_result_t dispatch_createudp(dns_dispatchmgr_t *mgr, - isc_socketmgr_t *sockmgr, - isc_taskmgr_t *taskmgr, - isc_sockaddr_t *localaddr, - unsigned int maxrequests, - unsigned int attributes, - dns_dispatch_t **dispp); -static isc_boolean_t destroy_mgr_ok(dns_dispatchmgr_t *mgr); -static void destroy_mgr(dns_dispatchmgr_t **mgrp); -static isc_result_t qid_allocate(dns_dispatchmgr_t *mgr, unsigned int buckets, - unsigned int increment, dns_qid_t **qidp); -static void qid_destroy(isc_mem_t *mctx, dns_qid_t **qidp); - -#define LVL(x) ISC_LOG_DEBUG(x) - -static void -mgr_log(dns_dispatchmgr_t *mgr, int level, const char *fmt, ...) - ISC_FORMAT_PRINTF(3, 4); - -static void -mgr_log(dns_dispatchmgr_t *mgr, int level, const char *fmt, ...) { - char msgbuf[2048]; - va_list ap; - - if (! isc_log_wouldlog(dns_lctx, level)) - return; - - va_start(ap, fmt); - vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); - va_end(ap); - - isc_log_write(dns_lctx, - DNS_LOGCATEGORY_DISPATCH, DNS_LOGMODULE_DISPATCH, - level, "dispatchmgr %p: %s", mgr, msgbuf); -} - -static void -dispatch_log(dns_dispatch_t *disp, int level, const char *fmt, ...) - ISC_FORMAT_PRINTF(3, 4); - -static void -dispatch_log(dns_dispatch_t *disp, int level, const char *fmt, ...) { - char msgbuf[2048]; - va_list ap; - - if (! isc_log_wouldlog(dns_lctx, level)) - return; - - va_start(ap, fmt); - vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); - va_end(ap); - - isc_log_write(dns_lctx, - DNS_LOGCATEGORY_DISPATCH, DNS_LOGMODULE_DISPATCH, - level, "dispatch %p: %s", disp, msgbuf); -} - -static void -request_log(dns_dispatch_t *disp, dns_dispentry_t *resp, - int level, const char *fmt, ...) - ISC_FORMAT_PRINTF(4, 5); - -static void -request_log(dns_dispatch_t *disp, dns_dispentry_t *resp, - int level, const char *fmt, ...) -{ - char msgbuf[2048]; - char peerbuf[256]; - va_list ap; - - if (! isc_log_wouldlog(dns_lctx, level)) - return; - - va_start(ap, fmt); - vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); - va_end(ap); - - if (VALID_RESPONSE(resp)) { - isc_sockaddr_format(&resp->host, peerbuf, sizeof(peerbuf)); - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DISPATCH, - DNS_LOGMODULE_DISPATCH, level, - "dispatch %p response %p %s: %s", disp, resp, - peerbuf, msgbuf); - } else { - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DISPATCH, - DNS_LOGMODULE_DISPATCH, level, - "dispatch %p req/resp %p: %s", disp, resp, - msgbuf); - } -} - -static void -reseed_lfsr(isc_lfsr_t *lfsr, void *arg) -{ - dns_dispatchmgr_t *mgr = arg; - isc_result_t result; - isc_uint32_t val; - - REQUIRE(VALID_DISPATCHMGR(mgr)); - - if (mgr->entropy != NULL) { - result = isc_entropy_getdata(mgr->entropy, &val, sizeof(val), - NULL, 0); - INSIST(result == ISC_R_SUCCESS); - lfsr->count = (val & 0x1f) + 32; - lfsr->state = val; - return; - } - - lfsr->count = (random() & 0x1f) + 32; /* From 32 to 63 states */ - lfsr->state = random(); -} - -/* - * Return an unpredictable message ID. - */ -static dns_messageid_t -dns_randomid(dns_qid_t *qid) { - isc_uint32_t id; - - id = isc_lfsr_generate32(&qid->qid_lfsr1, &qid->qid_lfsr2); - - return (dns_messageid_t)(id & 0xFFFF); -} - -/* - * Return a hash of the destination and message id. - */ -static isc_uint32_t -dns_hash(dns_qid_t *qid, isc_sockaddr_t *dest, dns_messageid_t id) { - unsigned int ret; - - ret = isc_sockaddr_hash(dest, ISC_TRUE); - ret ^= id; - ret %= qid->qid_nbuckets; - - INSIST(ret < qid->qid_nbuckets); - - return (ret); -} - -/* - * Find the first entry in 'qid'. Returns NULL if there are no entries. - */ -static dns_dispentry_t * -linear_first(dns_qid_t *qid) { - dns_dispentry_t *ret; - unsigned int bucket; - - bucket = 0; - - while (bucket < qid->qid_nbuckets) { - ret = ISC_LIST_HEAD(qid->qid_table[bucket]); - if (ret != NULL) - return (ret); - bucket++; - } - - return (NULL); -} - -/* - * Find the next entry after 'resp' in 'qid'. Return NULL if there are - * no more entries. - */ -static dns_dispentry_t * -linear_next(dns_qid_t *qid, dns_dispentry_t *resp) { - dns_dispentry_t *ret; - unsigned int bucket; - - ret = ISC_LIST_NEXT(resp, link); - if (ret != NULL) - return (ret); - - bucket = resp->bucket; - bucket++; - while (bucket < qid->qid_nbuckets) { - ret = ISC_LIST_HEAD(qid->qid_table[bucket]); - if (ret != NULL) - return (ret); - bucket++; - } - - return (NULL); -} - -/* - * The dispatch must be locked. - */ -static isc_boolean_t -destroy_disp_ok(dns_dispatch_t *disp) -{ - if (disp->refcount != 0) - return (ISC_FALSE); - - if (disp->recv_pending != 0) - return (ISC_FALSE); - - if (disp->shutting_down == 0) - return (ISC_FALSE); - - return (ISC_TRUE); -} - - -/* - * Called when refcount reaches 0 (and safe to destroy). - * - * The dispatcher must not be locked. - * The manager must be locked. - */ -static void -destroy_disp(isc_task_t *task, isc_event_t *event) { - dns_dispatch_t *disp; - dns_dispatchmgr_t *mgr; - isc_boolean_t killmgr; - - INSIST(event->ev_type == DNS_EVENT_DISPATCHCONTROL); - - UNUSED(task); - - disp = event->ev_arg; - mgr = disp->mgr; - - LOCK(&mgr->lock); - ISC_LIST_UNLINK(mgr->list, disp, link); - - dispatch_log(disp, LVL(90), - "shutting down; detaching from sock %p, task %p", - disp->socket, disp->task); - - isc_socket_detach(&disp->socket); - isc_task_detach(&disp->task); - isc_event_free(&event); - - dispatch_free(&disp); - - killmgr = destroy_mgr_ok(mgr); - UNLOCK(&mgr->lock); - if (killmgr) - destroy_mgr(&mgr); -} - - -/* - * Find an entry for query ID 'id' and socket address 'dest' in 'qid'. - * Return NULL if no such entry exists. - */ -static dns_dispentry_t * -bucket_search(dns_qid_t *qid, isc_sockaddr_t *dest, dns_messageid_t id, - unsigned int bucket) -{ - dns_dispentry_t *res; - - REQUIRE(bucket < qid->qid_nbuckets); - - res = ISC_LIST_HEAD(qid->qid_table[bucket]); - - while (res != NULL) { - if ((res->id == id) && isc_sockaddr_equal(dest, &res->host)) - return (res); - res = ISC_LIST_NEXT(res, link); - } - - return (NULL); -} - -static void -free_buffer(dns_dispatch_t *disp, void *buf, unsigned int len) { - INSIST(buf != NULL && len != 0); - - - switch (disp->socktype) { - case isc_sockettype_tcp: - INSIST(disp->tcpbuffers > 0); - disp->tcpbuffers--; - isc_mem_put(disp->mgr->mctx, buf, len); - break; - case isc_sockettype_udp: - LOCK(&disp->mgr->buffer_lock); - INSIST(disp->mgr->buffers > 0); - INSIST(len == disp->mgr->buffersize); - disp->mgr->buffers--; - isc_mempool_put(disp->mgr->bpool, buf); - UNLOCK(&disp->mgr->buffer_lock); - break; - default: - INSIST(0); - break; - } -} - -static void * -allocate_udp_buffer(dns_dispatch_t *disp) { - void *temp; - - LOCK(&disp->mgr->buffer_lock); - temp = isc_mempool_get(disp->mgr->bpool); - - if (temp != NULL) - disp->mgr->buffers++; - UNLOCK(&disp->mgr->buffer_lock); - - return (temp); -} - -static inline void -free_event(dns_dispatch_t *disp, dns_dispatchevent_t *ev) { - if (disp->failsafe_ev == ev) { - INSIST(disp->shutdown_out == 1); - disp->shutdown_out = 0; - - return; - } - - isc_mempool_put(disp->mgr->epool, ev); -} - -static inline dns_dispatchevent_t * -allocate_event(dns_dispatch_t *disp) { - dns_dispatchevent_t *ev; - - ev = isc_mempool_get(disp->mgr->epool); - if (ev == NULL) - return (NULL); - ISC_EVENT_INIT(ev, sizeof(*ev), 0, NULL, 0, - NULL, NULL, NULL, NULL, NULL); - - return (ev); -} - -/* - * General flow: - * - * If I/O result == CANCELED or error, free the buffer. - * - * If query, free the buffer, restart. - * - * If response: - * Allocate event, fill in details. - * If cannot allocate, free buffer, restart. - * find target. If not found, free buffer, restart. - * if event queue is not empty, queue. else, send. - * restart. - */ -static void -udp_recv(isc_task_t *task, isc_event_t *ev_in) { - isc_socketevent_t *ev = (isc_socketevent_t *)ev_in; - dns_dispatch_t *disp = ev_in->ev_arg; - dns_messageid_t id; - isc_result_t dres; - isc_buffer_t source; - unsigned int flags; - dns_dispentry_t *resp; - dns_dispatchevent_t *rev; - unsigned int bucket; - isc_boolean_t killit; - isc_boolean_t queue_response; - dns_dispatchmgr_t *mgr; - dns_qid_t *qid; - isc_netaddr_t netaddr; - int match; - - UNUSED(task); - - LOCK(&disp->lock); - - mgr = disp->mgr; - qid = mgr->qid; - - dispatch_log(disp, LVL(90), - "got packet: requests %d, buffers %d, recvs %d", - disp->requests, disp->mgr->buffers, disp->recv_pending); - - if (ev->ev_type == ISC_SOCKEVENT_RECVDONE) { - /* - * Unless the receive event was imported from a listening - * interface, in which case the event type is - * DNS_EVENT_IMPORTRECVDONE, receive operation must be pending. - */ - INSIST(disp->recv_pending != 0); - disp->recv_pending = 0; - } - - if (disp->shutting_down) { - /* - * This dispatcher is shutting down. - */ - free_buffer(disp, ev->region.base, ev->region.length); - - isc_event_free(&ev_in); - ev = NULL; - - killit = destroy_disp_ok(disp); - UNLOCK(&disp->lock); - if (killit) - isc_task_send(disp->task, &disp->ctlevent); - - return; - } - - if (ev->result != ISC_R_SUCCESS) { - free_buffer(disp, ev->region.base, ev->region.length); - - if (ev->result != ISC_R_CANCELED) - dispatch_log(disp, ISC_LOG_ERROR, - "odd socket result in udp_recv(): %s", - isc_result_totext(ev->result)); - - UNLOCK(&disp->lock); - isc_event_free(&ev_in); - return; - } - - /* - * If this is from a blackholed address, drop it. - */ - isc_netaddr_fromsockaddr(&netaddr, &ev->address); - if (disp->mgr->blackhole != NULL && - dns_acl_match(&netaddr, NULL, disp->mgr->blackhole, - NULL, &match, NULL) == ISC_R_SUCCESS && - match > 0) - { - if (isc_log_wouldlog(dns_lctx, LVL(10))) { - char netaddrstr[ISC_NETADDR_FORMATSIZE]; - isc_netaddr_format(&netaddr, netaddrstr, - sizeof(netaddrstr)); - dispatch_log(disp, LVL(10), - "blackholed packet from %s", - netaddrstr); - } - free_buffer(disp, ev->region.base, ev->region.length); - goto restart; - } - - /* - * Peek into the buffer to see what we can see. - */ - isc_buffer_init(&source, ev->region.base, ev->region.length); - isc_buffer_add(&source, ev->n); - dres = dns_message_peekheader(&source, &id, &flags); - if (dres != ISC_R_SUCCESS) { - free_buffer(disp, ev->region.base, ev->region.length); - dispatch_log(disp, LVL(10), "got garbage packet"); - goto restart; - } - - dispatch_log(disp, LVL(92), - "got valid DNS message header, /QR %c, id %u", - ((flags & DNS_MESSAGEFLAG_QR) ? '1' : '0'), id); - - /* - * Look at flags. If query, drop it. If response, - * look to see where it goes. - */ - queue_response = ISC_FALSE; - if ((flags & DNS_MESSAGEFLAG_QR) == 0) { - /* query */ - free_buffer(disp, ev->region.base, ev->region.length); - goto restart; - } - - /* response */ - bucket = dns_hash(qid, &ev->address, id); - LOCK(&qid->lock); - resp = bucket_search(qid, &ev->address, id, bucket); - dispatch_log(disp, LVL(90), - "search for response in bucket %d: %s", - bucket, (resp == NULL ? "not found" : "found")); - - if (resp == NULL) { - free_buffer(disp, ev->region.base, ev->region.length); - goto unlock; - } - queue_response = resp->item_out; - rev = allocate_event(resp->disp); - if (rev == NULL) { - free_buffer(disp, ev->region.base, ev->region.length); - goto unlock; - } - - /* - * At this point, rev contains the event we want to fill in, and - * resp contains the information on the place to send it to. - * Send the event off. - */ - isc_buffer_init(&rev->buffer, ev->region.base, ev->region.length); - isc_buffer_add(&rev->buffer, ev->n); - rev->result = ISC_R_SUCCESS; - rev->id = id; - rev->addr = ev->address; - rev->pktinfo = ev->pktinfo; - rev->attributes = ev->attributes; - if (queue_response) { - ISC_LIST_APPEND(resp->items, rev, ev_link); - } else { - ISC_EVENT_INIT(rev, sizeof(*rev), 0, NULL, - DNS_EVENT_DISPATCH, - resp->action, resp->arg, resp, NULL, NULL); - request_log(disp, resp, LVL(90), - "[a] Sent event %p buffer %p len %d to task %p", - rev, rev->buffer.base, rev->buffer.length, - resp->task); - resp->item_out = ISC_TRUE; - isc_task_send(resp->task, ISC_EVENT_PTR(&rev)); - } - unlock: - UNLOCK(&qid->lock); - - /* - * Restart recv() to get the next packet. - */ - restart: - startrecv(disp); - - UNLOCK(&disp->lock); - - isc_event_free(&ev_in); -} - -/* - * General flow: - * - * If I/O result == CANCELED, EOF, or error, notify everyone as the - * various queues drain. - * - * If query, restart. - * - * If response: - * Allocate event, fill in details. - * If cannot allocate, restart. - * find target. If not found, restart. - * if event queue is not empty, queue. else, send. - * restart. - */ -static void -tcp_recv(isc_task_t *task, isc_event_t *ev_in) { - dns_dispatch_t *disp = ev_in->ev_arg; - dns_tcpmsg_t *tcpmsg = &disp->tcpmsg; - dns_messageid_t id; - isc_result_t dres; - unsigned int flags; - dns_dispentry_t *resp; - dns_dispatchevent_t *rev; - unsigned int bucket; - isc_boolean_t killit; - isc_boolean_t queue_response; - dns_qid_t *qid; - int level; - char buf[ISC_SOCKADDR_FORMATSIZE]; - - UNUSED(task); - - REQUIRE(VALID_DISPATCH(disp)); - - qid = disp->qid; - - dispatch_log(disp, LVL(90), - "got TCP packet: requests %d, buffers %d, recvs %d", - disp->requests, disp->tcpbuffers, disp->recv_pending); - - LOCK(&disp->lock); - - INSIST(disp->recv_pending != 0); - disp->recv_pending = 0; - - if (disp->refcount == 0) { - /* - * This dispatcher is shutting down. Force cancelation. - */ - tcpmsg->result = ISC_R_CANCELED; - } - - if (tcpmsg->result != ISC_R_SUCCESS) { - switch (tcpmsg->result) { - case ISC_R_CANCELED: - break; - - case ISC_R_EOF: - dispatch_log(disp, LVL(90), "shutting down on EOF"); - do_cancel(disp); - break; - - case ISC_R_CONNECTIONRESET: - level = ISC_LOG_INFO; - goto logit; - - default: - level = ISC_LOG_ERROR; - logit: - isc_sockaddr_format(&tcpmsg->address, buf, sizeof(buf)); - dispatch_log(disp, level, "shutting down due to TCP " - "receive error: %s: %s", buf, - isc_result_totext(tcpmsg->result)); - do_cancel(disp); - break; - } - - /* - * The event is statically allocated in the tcpmsg - * structure, and destroy_disp() frees the tcpmsg, so we must - * free the event *before* calling destroy_disp(). - */ - isc_event_free(&ev_in); - - disp->shutting_down = 1; - disp->shutdown_why = tcpmsg->result; - - /* - * If the recv() was canceled pass the word on. - */ - killit = destroy_disp_ok(disp); - UNLOCK(&disp->lock); - if (killit) - isc_task_send(disp->task, &disp->ctlevent); - return; - } - - dispatch_log(disp, LVL(90), "result %d, length == %d, addr = %p", - tcpmsg->result, - tcpmsg->buffer.length, tcpmsg->buffer.base); - - /* - * Peek into the buffer to see what we can see. - */ - dres = dns_message_peekheader(&tcpmsg->buffer, &id, &flags); - if (dres != ISC_R_SUCCESS) { - dispatch_log(disp, LVL(10), "got garbage packet"); - goto restart; - } - - dispatch_log(disp, LVL(92), - "got valid DNS message header, /QR %c, id %u", - ((flags & DNS_MESSAGEFLAG_QR) ? '1' : '0'), id); - - /* - * Allocate an event to send to the query or response client, and - * allocate a new buffer for our use. - */ - - /* - * Look at flags. If query, drop it. If response, - * look to see where it goes. - */ - queue_response = ISC_FALSE; - if ((flags & DNS_MESSAGEFLAG_QR) == 0) { - /* - * Query. - */ - goto restart; - } - - /* - * Response. - */ - bucket = dns_hash(qid, &tcpmsg->address, id); - LOCK(&qid->lock); - resp = bucket_search(qid, &tcpmsg->address, id, bucket); - dispatch_log(disp, LVL(90), - "search for response in bucket %d: %s", - bucket, (resp == NULL ? "not found" : "found")); - - if (resp == NULL) - goto unlock; - queue_response = resp->item_out; - rev = allocate_event(disp); - if (rev == NULL) - goto unlock; - - /* - * At this point, rev contains the event we want to fill in, and - * resp contains the information on the place to send it to. - * Send the event off. - */ - dns_tcpmsg_keepbuffer(tcpmsg, &rev->buffer); - disp->tcpbuffers++; - rev->result = ISC_R_SUCCESS; - rev->id = id; - rev->addr = tcpmsg->address; - if (queue_response) { - ISC_LIST_APPEND(resp->items, rev, ev_link); - } else { - ISC_EVENT_INIT(rev, sizeof(*rev), 0, NULL, DNS_EVENT_DISPATCH, - resp->action, resp->arg, resp, NULL, NULL); - request_log(disp, resp, LVL(90), - "[b] Sent event %p buffer %p len %d to task %p", - rev, rev->buffer.base, rev->buffer.length, - resp->task); - resp->item_out = ISC_TRUE; - isc_task_send(resp->task, ISC_EVENT_PTR(&rev)); - } - unlock: - UNLOCK(&qid->lock); - - /* - * Restart recv() to get the next packet. - */ - restart: - startrecv(disp); - - UNLOCK(&disp->lock); - - isc_event_free(&ev_in); -} - -/* - * disp must be locked. - */ -static void -startrecv(dns_dispatch_t *disp) { - isc_result_t res; - isc_region_t region; - - if (disp->shutting_down == 1) - return; - - if ((disp->attributes & DNS_DISPATCHATTR_NOLISTEN) != 0) - return; - - if (disp->recv_pending != 0) - return; - - if (disp->mgr->buffers >= disp->mgr->maxbuffers) - return; - - switch (disp->socktype) { - /* - * UDP reads are always maximal. - */ - case isc_sockettype_udp: - region.length = disp->mgr->buffersize; - region.base = allocate_udp_buffer(disp); - if (region.base == NULL) - return; - res = isc_socket_recv(disp->socket, ®ion, 1, - disp->task, udp_recv, disp); - if (res != ISC_R_SUCCESS) { - free_buffer(disp, region.base, region.length); - disp->shutdown_why = res; - disp->shutting_down = 1; - do_cancel(disp); - return; - } - INSIST(disp->recv_pending == 0); - disp->recv_pending = 1; - break; - - case isc_sockettype_tcp: - res = dns_tcpmsg_readmessage(&disp->tcpmsg, disp->task, - tcp_recv, disp); - if (res != ISC_R_SUCCESS) { - disp->shutdown_why = res; - disp->shutting_down = 1; - do_cancel(disp); - return; - } - INSIST(disp->recv_pending == 0); - disp->recv_pending = 1; - break; - } -} - -/* - * Mgr must be locked when calling this function. - */ -static isc_boolean_t -destroy_mgr_ok(dns_dispatchmgr_t *mgr) { - mgr_log(mgr, LVL(90), - "destroy_mgr_ok: shuttingdown=%d, listnonempty=%d, " - "epool=%d, rpool=%d, dpool=%d", - MGR_IS_SHUTTINGDOWN(mgr), !ISC_LIST_EMPTY(mgr->list), - isc_mempool_getallocated(mgr->epool), - isc_mempool_getallocated(mgr->rpool), - isc_mempool_getallocated(mgr->dpool)); - if (!MGR_IS_SHUTTINGDOWN(mgr)) - return (ISC_FALSE); - if (!ISC_LIST_EMPTY(mgr->list)) - return (ISC_FALSE); - if (isc_mempool_getallocated(mgr->epool) != 0) - return (ISC_FALSE); - if (isc_mempool_getallocated(mgr->rpool) != 0) - return (ISC_FALSE); - if (isc_mempool_getallocated(mgr->dpool) != 0) - return (ISC_FALSE); - - return (ISC_TRUE); -} - -/* - * Mgr must be unlocked when calling this function. - */ -static void -destroy_mgr(dns_dispatchmgr_t **mgrp) { - isc_mem_t *mctx; - dns_dispatchmgr_t *mgr; - - mgr = *mgrp; - *mgrp = NULL; - - mctx = mgr->mctx; - - mgr->magic = 0; - mgr->mctx = NULL; - DESTROYLOCK(&mgr->lock); - mgr->state = 0; - - isc_mempool_destroy(&mgr->epool); - isc_mempool_destroy(&mgr->rpool); - isc_mempool_destroy(&mgr->dpool); - isc_mempool_destroy(&mgr->bpool); - - DESTROYLOCK(&mgr->pool_lock); - - if (mgr->entropy != NULL) - isc_entropy_detach(&mgr->entropy); - if (mgr->qid != NULL) - qid_destroy(mctx, &mgr->qid); - - DESTROYLOCK(&mgr->buffer_lock); - - if (mgr->blackhole != NULL) - dns_acl_detach(&mgr->blackhole); - - if (mgr->portlist != NULL) - dns_portlist_detach(&mgr->portlist); - - isc_mem_put(mctx, mgr, sizeof(dns_dispatchmgr_t)); - isc_mem_detach(&mctx); -} - -static isc_result_t -create_socket(isc_socketmgr_t *mgr, isc_sockaddr_t *local, - isc_socket_t **sockp) -{ - isc_socket_t *sock; - isc_result_t result; - - sock = NULL; - result = isc_socket_create(mgr, isc_sockaddr_pf(local), - isc_sockettype_udp, &sock); - if (result != ISC_R_SUCCESS) - return (result); - -#ifndef ISC_ALLOW_MAPPED - isc_socket_ipv6only(sock, ISC_TRUE); -#endif - result = isc_socket_bind(sock, local); - if (result != ISC_R_SUCCESS) { - isc_socket_detach(&sock); - return (result); - } - - *sockp = sock; - return (ISC_R_SUCCESS); -} - -/* - * Publics. - */ - -isc_result_t -dns_dispatchmgr_create(isc_mem_t *mctx, isc_entropy_t *entropy, - dns_dispatchmgr_t **mgrp) -{ - dns_dispatchmgr_t *mgr; - isc_result_t result; - - REQUIRE(mctx != NULL); - REQUIRE(mgrp != NULL && *mgrp == NULL); - - mgr = isc_mem_get(mctx, sizeof(dns_dispatchmgr_t)); - if (mgr == NULL) - return (ISC_R_NOMEMORY); - - mgr->mctx = NULL; - isc_mem_attach(mctx, &mgr->mctx); - - mgr->blackhole = NULL; - mgr->portlist = NULL; - - result = isc_mutex_init(&mgr->lock); - if (result != ISC_R_SUCCESS) - goto deallocate; - - result = isc_mutex_init(&mgr->buffer_lock); - if (result != ISC_R_SUCCESS) - goto kill_lock; - - result = isc_mutex_init(&mgr->pool_lock); - if (result != ISC_R_SUCCESS) - goto kill_buffer_lock; - - mgr->epool = NULL; - if (isc_mempool_create(mgr->mctx, sizeof(dns_dispatchevent_t), - &mgr->epool) != ISC_R_SUCCESS) { - result = ISC_R_NOMEMORY; - goto kill_pool_lock; - } - - mgr->rpool = NULL; - if (isc_mempool_create(mgr->mctx, sizeof(dns_dispentry_t), - &mgr->rpool) != ISC_R_SUCCESS) { - result = ISC_R_NOMEMORY; - goto kill_epool; - } - - mgr->dpool = NULL; - if (isc_mempool_create(mgr->mctx, sizeof(dns_dispatch_t), - &mgr->dpool) != ISC_R_SUCCESS) { - result = ISC_R_NOMEMORY; - goto kill_rpool; - } - - isc_mempool_setname(mgr->epool, "dispmgr_epool"); - isc_mempool_setfreemax(mgr->epool, 1024); - isc_mempool_associatelock(mgr->epool, &mgr->pool_lock); - - isc_mempool_setname(mgr->rpool, "dispmgr_rpool"); - isc_mempool_setfreemax(mgr->rpool, 1024); - isc_mempool_associatelock(mgr->rpool, &mgr->pool_lock); - - isc_mempool_setname(mgr->dpool, "dispmgr_dpool"); - isc_mempool_setfreemax(mgr->dpool, 1024); - isc_mempool_associatelock(mgr->dpool, &mgr->pool_lock); - - mgr->buffers = 0; - mgr->buffersize = 0; - mgr->maxbuffers = 0; - mgr->bpool = NULL; - mgr->entropy = NULL; - mgr->qid = NULL; - mgr->state = 0; - ISC_LIST_INIT(mgr->list); - mgr->magic = DNS_DISPATCHMGR_MAGIC; - - if (entropy != NULL) - isc_entropy_attach(entropy, &mgr->entropy); - - *mgrp = mgr; - return (ISC_R_SUCCESS); - - kill_rpool: - isc_mempool_destroy(&mgr->rpool); - kill_epool: - isc_mempool_destroy(&mgr->epool); - kill_pool_lock: - DESTROYLOCK(&mgr->pool_lock); - kill_buffer_lock: - DESTROYLOCK(&mgr->buffer_lock); - kill_lock: - DESTROYLOCK(&mgr->lock); - deallocate: - isc_mem_put(mctx, mgr, sizeof(dns_dispatchmgr_t)); - isc_mem_detach(&mctx); - - return (result); -} - -void -dns_dispatchmgr_setblackhole(dns_dispatchmgr_t *mgr, dns_acl_t *blackhole) { - REQUIRE(VALID_DISPATCHMGR(mgr)); - if (mgr->blackhole != NULL) - dns_acl_detach(&mgr->blackhole); - dns_acl_attach(blackhole, &mgr->blackhole); -} - -dns_acl_t * -dns_dispatchmgr_getblackhole(dns_dispatchmgr_t *mgr) { - REQUIRE(VALID_DISPATCHMGR(mgr)); - return (mgr->blackhole); -} - -void -dns_dispatchmgr_setblackportlist(dns_dispatchmgr_t *mgr, - dns_portlist_t *portlist) -{ - REQUIRE(VALID_DISPATCHMGR(mgr)); - if (mgr->portlist != NULL) - dns_portlist_detach(&mgr->portlist); - if (portlist != NULL) - dns_portlist_attach(portlist, &mgr->portlist); -} - -dns_portlist_t * -dns_dispatchmgr_getblackportlist(dns_dispatchmgr_t *mgr) { - REQUIRE(VALID_DISPATCHMGR(mgr)); - return (mgr->portlist); -} - -static isc_result_t -dns_dispatchmgr_setudp(dns_dispatchmgr_t *mgr, - unsigned int buffersize, unsigned int maxbuffers, - unsigned int buckets, unsigned int increment) -{ - isc_result_t result; - - REQUIRE(VALID_DISPATCHMGR(mgr)); - REQUIRE(buffersize >= 512 && buffersize < (64 * 1024)); - REQUIRE(maxbuffers > 0); - REQUIRE(buckets < 2097169); /* next prime > 65536 * 32 */ - REQUIRE(increment > buckets); - - /* - * Keep some number of items around. This should be a config - * option. For now, keep 8, but later keep at least two even - * if the caller wants less. This allows us to ensure certain - * things, like an event can be "freed" and the next allocation - * will always succeed. - * - * Note that if limits are placed on anything here, we use one - * event internally, so the actual limit should be "wanted + 1." - * - * XXXMLG - */ - - if (maxbuffers < 8) - maxbuffers = 8; - - LOCK(&mgr->buffer_lock); - if (mgr->bpool != NULL) { - isc_mempool_setmaxalloc(mgr->bpool, maxbuffers); - mgr->maxbuffers = maxbuffers; - UNLOCK(&mgr->buffer_lock); - return (ISC_R_SUCCESS); - } - - if (isc_mempool_create(mgr->mctx, buffersize, - &mgr->bpool) != ISC_R_SUCCESS) { - return (ISC_R_NOMEMORY); - } - - isc_mempool_setname(mgr->bpool, "dispmgr_bpool"); - isc_mempool_setmaxalloc(mgr->bpool, maxbuffers); - isc_mempool_associatelock(mgr->bpool, &mgr->pool_lock); - - result = qid_allocate(mgr, buckets, increment, &mgr->qid); - if (result != ISC_R_SUCCESS) - goto cleanup; - - mgr->buffersize = buffersize; - mgr->maxbuffers = maxbuffers; - UNLOCK(&mgr->buffer_lock); - return (ISC_R_SUCCESS); - - cleanup: - isc_mempool_destroy(&mgr->bpool); - UNLOCK(&mgr->buffer_lock); - return (ISC_R_NOMEMORY); -} - -void -dns_dispatchmgr_destroy(dns_dispatchmgr_t **mgrp) { - dns_dispatchmgr_t *mgr; - isc_boolean_t killit; - - REQUIRE(mgrp != NULL); - REQUIRE(VALID_DISPATCHMGR(*mgrp)); - - mgr = *mgrp; - *mgrp = NULL; - - LOCK(&mgr->lock); - mgr->state |= MGR_SHUTTINGDOWN; - - killit = destroy_mgr_ok(mgr); - UNLOCK(&mgr->lock); - - mgr_log(mgr, LVL(90), "destroy: killit=%d", killit); - - if (killit) - destroy_mgr(&mgr); -} - -static isc_boolean_t -blacklisted(dns_dispatchmgr_t *mgr, isc_socket_t *sock) { - isc_sockaddr_t sockaddr; - isc_result_t result; - - if (mgr->portlist == NULL) - return (ISC_FALSE); - - result = isc_socket_getsockname(sock, &sockaddr); - if (result != ISC_R_SUCCESS) - return (ISC_FALSE); - - if (mgr->portlist != NULL && - dns_portlist_match(mgr->portlist, isc_sockaddr_pf(&sockaddr), - isc_sockaddr_getport(&sockaddr))) - return (ISC_TRUE); - return (ISC_FALSE); -} - -#define ATTRMATCH(_a1, _a2, _mask) (((_a1) & (_mask)) == ((_a2) & (_mask))) - -static isc_boolean_t -local_addr_match(dns_dispatch_t *disp, isc_sockaddr_t *addr) { - isc_sockaddr_t sockaddr; - isc_result_t result; - - if (addr == NULL) - return (ISC_TRUE); - - /* - * Don't match wildcard ports against newly blacklisted ports. - */ - if (disp->mgr->portlist != NULL && - isc_sockaddr_getport(addr) == 0 && - isc_sockaddr_getport(&disp->local) == 0 && - blacklisted(disp->mgr, disp->socket)) - return (ISC_FALSE); - - /* - * Check if we match the binding <address,port>. - * Wildcard ports match/fail here. - */ - if (isc_sockaddr_equal(&disp->local, addr)) - return (ISC_TRUE); - if (isc_sockaddr_getport(addr) == 0) - return (ISC_FALSE); - - /* - * Check if we match a bound wildcard port <address,port>. - */ - if (!isc_sockaddr_eqaddr(&disp->local, addr)) - return (ISC_FALSE); - result = isc_socket_getsockname(disp->socket, &sockaddr); - if (result != ISC_R_SUCCESS) - return (ISC_FALSE); - - return (isc_sockaddr_equal(&sockaddr, addr)); -} - -/* - * Requires mgr be locked. - * - * No dispatcher can be locked by this thread when calling this function. - * - * - * NOTE: - * If a matching dispatcher is found, it is locked after this function - * returns, and must be unlocked by the caller. - */ -static isc_result_t -dispatch_find(dns_dispatchmgr_t *mgr, isc_sockaddr_t *local, - unsigned int attributes, unsigned int mask, - dns_dispatch_t **dispp) -{ - dns_dispatch_t *disp; - isc_result_t result; - - /* - * Make certain that we will not match a private dispatch. - */ - attributes &= ~DNS_DISPATCHATTR_PRIVATE; - mask |= DNS_DISPATCHATTR_PRIVATE; - - disp = ISC_LIST_HEAD(mgr->list); - while (disp != NULL) { - LOCK(&disp->lock); - if ((disp->shutting_down == 0) - && ATTRMATCH(disp->attributes, attributes, mask) - && local_addr_match(disp, local)) - break; - UNLOCK(&disp->lock); - disp = ISC_LIST_NEXT(disp, link); - } - - if (disp == NULL) { - result = ISC_R_NOTFOUND; - goto out; - } - - *dispp = disp; - result = ISC_R_SUCCESS; - out: - - return (result); -} - -static isc_result_t -qid_allocate(dns_dispatchmgr_t *mgr, unsigned int buckets, - unsigned int increment, dns_qid_t **qidp) -{ - dns_qid_t *qid; - unsigned int i; - - REQUIRE(VALID_DISPATCHMGR(mgr)); - REQUIRE(buckets < 2097169); /* next prime > 65536 * 32 */ - REQUIRE(increment > buckets); - REQUIRE(qidp != NULL && *qidp == NULL); - - qid = isc_mem_get(mgr->mctx, sizeof(*qid)); - if (qid == NULL) - return (ISC_R_NOMEMORY); - - qid->qid_table = isc_mem_get(mgr->mctx, - buckets * sizeof(dns_displist_t)); - if (qid->qid_table == NULL) { - isc_mem_put(mgr->mctx, qid, sizeof(*qid)); - return (ISC_R_NOMEMORY); - } - - if (isc_mutex_init(&qid->lock) != ISC_R_SUCCESS) { - UNEXPECTED_ERROR(__FILE__, __LINE__, "isc_mutex_init failed"); - isc_mem_put(mgr->mctx, qid->qid_table, - buckets * sizeof(dns_displist_t)); - isc_mem_put(mgr->mctx, qid, sizeof(*qid)); - return (ISC_R_UNEXPECTED); - } - - for (i = 0; i < buckets; i++) - ISC_LIST_INIT(qid->qid_table[i]); - - qid->qid_nbuckets = buckets; - qid->qid_increment = increment; - qid->magic = QID_MAGIC; - - /* - * Initialize to a 32-bit LFSR. Both of these are from Applied - * Cryptography. - * - * lfsr1: - * x^32 + x^7 + x^5 + x^3 + x^2 + x + 1 - * - * lfsr2: - * x^32 + x^7 + x^6 + x^2 + 1 - */ - isc_lfsr_init(&qid->qid_lfsr1, 0, 32, 0x80000057U, - 0, reseed_lfsr, mgr); - isc_lfsr_init(&qid->qid_lfsr2, 0, 32, 0x80000062U, - 0, reseed_lfsr, mgr); - *qidp = qid; - return (ISC_R_SUCCESS); -} - -static void -qid_destroy(isc_mem_t *mctx, dns_qid_t **qidp) { - dns_qid_t *qid; - - REQUIRE(qidp != NULL); - qid = *qidp; - - REQUIRE(VALID_QID(qid)); - - *qidp = NULL; - qid->magic = 0; - isc_mem_put(mctx, qid->qid_table, - qid->qid_nbuckets * sizeof(dns_displist_t)); - DESTROYLOCK(&qid->lock); - isc_mem_put(mctx, qid, sizeof(*qid)); -} - -/* - * Allocate and set important limits. - */ -static isc_result_t -dispatch_allocate(dns_dispatchmgr_t *mgr, unsigned int maxrequests, - dns_dispatch_t **dispp) -{ - dns_dispatch_t *disp; - isc_result_t res; - - REQUIRE(VALID_DISPATCHMGR(mgr)); - REQUIRE(dispp != NULL && *dispp == NULL); - - /* - * Set up the dispatcher, mostly. Don't bother setting some of - * the options that are controlled by tcp vs. udp, etc. - */ - - disp = isc_mempool_get(mgr->dpool); - if (disp == NULL) - return (ISC_R_NOMEMORY); - - disp->magic = 0; - disp->mgr = mgr; - disp->maxrequests = maxrequests; - disp->attributes = 0; - ISC_LINK_INIT(disp, link); - disp->refcount = 1; - disp->recv_pending = 0; - memset(&disp->local, 0, sizeof(disp->local)); - disp->shutting_down = 0; - disp->shutdown_out = 0; - disp->connected = 0; - disp->tcpmsg_valid = 0; - disp->shutdown_why = ISC_R_UNEXPECTED; - disp->requests = 0; - disp->tcpbuffers = 0; - disp->qid = NULL; - - if (isc_mutex_init(&disp->lock) != ISC_R_SUCCESS) { - res = ISC_R_UNEXPECTED; - UNEXPECTED_ERROR(__FILE__, __LINE__, "isc_mutex_init failed"); - goto deallocate; - } - - disp->failsafe_ev = allocate_event(disp); - if (disp->failsafe_ev == NULL) { - res = ISC_R_NOMEMORY; - goto kill_lock; - } - - disp->magic = DISPATCH_MAGIC; - - *dispp = disp; - return (ISC_R_SUCCESS); - - /* - * error returns - */ - kill_lock: - DESTROYLOCK(&disp->lock); - deallocate: - isc_mempool_put(mgr->dpool, disp); - - return (res); -} - - -/* - * MUST be unlocked, and not used by anthing. - */ -static void -dispatch_free(dns_dispatch_t **dispp) -{ - dns_dispatch_t *disp; - dns_dispatchmgr_t *mgr; - - REQUIRE(VALID_DISPATCH(*dispp)); - disp = *dispp; - *dispp = NULL; - - mgr = disp->mgr; - REQUIRE(VALID_DISPATCHMGR(mgr)); - - if (disp->tcpmsg_valid) { - dns_tcpmsg_invalidate(&disp->tcpmsg); - disp->tcpmsg_valid = 0; - } - - INSIST(disp->tcpbuffers == 0); - INSIST(disp->requests == 0); - INSIST(disp->recv_pending == 0); - - isc_mempool_put(mgr->epool, disp->failsafe_ev); - disp->failsafe_ev = NULL; - - if (disp->qid != NULL) - qid_destroy(mgr->mctx, &disp->qid); - disp->mgr = NULL; - DESTROYLOCK(&disp->lock); - disp->magic = 0; - isc_mempool_put(mgr->dpool, disp); -} - -isc_result_t -dns_dispatch_createtcp(dns_dispatchmgr_t *mgr, isc_socket_t *sock, - isc_taskmgr_t *taskmgr, unsigned int buffersize, - unsigned int maxbuffers, unsigned int maxrequests, - unsigned int buckets, unsigned int increment, - unsigned int attributes, dns_dispatch_t **dispp) -{ - isc_result_t result; - dns_dispatch_t *disp; - - UNUSED(maxbuffers); - UNUSED(buffersize); - - REQUIRE(VALID_DISPATCHMGR(mgr)); - REQUIRE(isc_socket_gettype(sock) == isc_sockettype_tcp); - REQUIRE((attributes & DNS_DISPATCHATTR_TCP) != 0); - REQUIRE((attributes & DNS_DISPATCHATTR_UDP) == 0); - - attributes |= DNS_DISPATCHATTR_PRIVATE; /* XXXMLG */ - - LOCK(&mgr->lock); - - /* - * dispatch_allocate() checks mgr for us. - * qid_allocate() checks buckets and increment for us. - */ - disp = NULL; - result = dispatch_allocate(mgr, maxrequests, &disp); - if (result != ISC_R_SUCCESS) { - UNLOCK(&mgr->lock); - return (result); - } - - result = qid_allocate(mgr, buckets, increment, &disp->qid); - if (result != ISC_R_SUCCESS) - goto deallocate_dispatch; - - disp->socktype = isc_sockettype_tcp; - disp->socket = NULL; - isc_socket_attach(sock, &disp->socket); - - disp->task = NULL; - result = isc_task_create(taskmgr, 0, &disp->task); - if (result != ISC_R_SUCCESS) - goto kill_socket; - - disp->ctlevent = isc_event_allocate(mgr->mctx, disp, - DNS_EVENT_DISPATCHCONTROL, - destroy_disp, disp, - sizeof(isc_event_t)); - if (disp->ctlevent == NULL) - goto kill_task; - - isc_task_setname(disp->task, "tcpdispatch", disp); - - dns_tcpmsg_init(mgr->mctx, disp->socket, &disp->tcpmsg); - disp->tcpmsg_valid = 1; - - disp->attributes = attributes; - - /* - * Append it to the dispatcher list. - */ - ISC_LIST_APPEND(mgr->list, disp, link); - UNLOCK(&mgr->lock); - - mgr_log(mgr, LVL(90), "created TCP dispatcher %p", disp); - dispatch_log(disp, LVL(90), "created task %p", disp->task); - - *dispp = disp; - - return (ISC_R_SUCCESS); - - /* - * Error returns. - */ - kill_task: - isc_task_detach(&disp->task); - kill_socket: - isc_socket_detach(&disp->socket); - deallocate_dispatch: - dispatch_free(&disp); - - UNLOCK(&mgr->lock); - - return (result); -} - -isc_result_t -dns_dispatch_getudp(dns_dispatchmgr_t *mgr, isc_socketmgr_t *sockmgr, - isc_taskmgr_t *taskmgr, isc_sockaddr_t *localaddr, - unsigned int buffersize, - unsigned int maxbuffers, unsigned int maxrequests, - unsigned int buckets, unsigned int increment, - unsigned int attributes, unsigned int mask, - dns_dispatch_t **dispp) -{ - isc_result_t result; - dns_dispatch_t *disp; - - REQUIRE(VALID_DISPATCHMGR(mgr)); - REQUIRE(sockmgr != NULL); - REQUIRE(localaddr != NULL); - REQUIRE(taskmgr != NULL); - REQUIRE(buffersize >= 512 && buffersize < (64 * 1024)); - REQUIRE(maxbuffers > 0); - REQUIRE(buckets < 2097169); /* next prime > 65536 * 32 */ - REQUIRE(increment > buckets); - REQUIRE(dispp != NULL && *dispp == NULL); - REQUIRE((attributes & DNS_DISPATCHATTR_TCP) == 0); - - result = dns_dispatchmgr_setudp(mgr, buffersize, maxbuffers, - buckets, increment); - if (result != ISC_R_SUCCESS) - return (result); - - LOCK(&mgr->lock); - - /* - * First, see if we have a dispatcher that matches. - */ - disp = NULL; - result = dispatch_find(mgr, localaddr, attributes, mask, &disp); - if (result == ISC_R_SUCCESS) { - disp->refcount++; - - if (disp->maxrequests < maxrequests) - disp->maxrequests = maxrequests; - - if ((disp->attributes & DNS_DISPATCHATTR_NOLISTEN) == 0 && - (attributes & DNS_DISPATCHATTR_NOLISTEN) != 0) - { - disp->attributes |= DNS_DISPATCHATTR_NOLISTEN; - if (disp->recv_pending != 0) - isc_socket_cancel(disp->socket, disp->task, - ISC_SOCKCANCEL_RECV); - } - - UNLOCK(&disp->lock); - UNLOCK(&mgr->lock); - - *dispp = disp; - - return (ISC_R_SUCCESS); - } - - /* - * Nope, create one. - */ - result = dispatch_createudp(mgr, sockmgr, taskmgr, localaddr, - maxrequests, attributes, &disp); - if (result != ISC_R_SUCCESS) { - UNLOCK(&mgr->lock); - return (result); - } - - UNLOCK(&mgr->lock); - *dispp = disp; - return (ISC_R_SUCCESS); -} - -/* - * mgr should be locked. - */ -static isc_result_t -dispatch_createudp(dns_dispatchmgr_t *mgr, isc_socketmgr_t *sockmgr, - isc_taskmgr_t *taskmgr, - isc_sockaddr_t *localaddr, - unsigned int maxrequests, - unsigned int attributes, - dns_dispatch_t **dispp) -{ - isc_result_t result; - dns_dispatch_t *disp; - isc_socket_t *sock; - - /* - * dispatch_allocate() checks mgr for us. - */ - disp = NULL; - result = dispatch_allocate(mgr, maxrequests, &disp); - if (result != ISC_R_SUCCESS) - return (result); - - /* - * This assumes that the IP stack will *not* quickly reallocate - * the same port. If it does continually reallocate the same port - * then we need a mechanism to hold all the blacklisted sockets - * until we find a usable socket. - */ - getsocket: - result = create_socket(sockmgr, localaddr, &sock); - if (result != ISC_R_SUCCESS) - goto deallocate_dispatch; - if (isc_sockaddr_getport(localaddr) == 0 && blacklisted(mgr, sock)) { - isc_socket_detach(&sock); - goto getsocket; - } - - disp->socktype = isc_sockettype_udp; - disp->socket = sock; - disp->local = *localaddr; - - disp->task = NULL; - result = isc_task_create(taskmgr, 0, &disp->task); - if (result != ISC_R_SUCCESS) - goto kill_socket; - - disp->ctlevent = isc_event_allocate(mgr->mctx, disp, - DNS_EVENT_DISPATCHCONTROL, - destroy_disp, disp, - sizeof(isc_event_t)); - if (disp->ctlevent == NULL) - goto kill_task; - - isc_task_setname(disp->task, "udpdispatch", disp); - - attributes &= ~DNS_DISPATCHATTR_TCP; - attributes |= DNS_DISPATCHATTR_UDP; - disp->attributes = attributes; - - /* - * Append it to the dispatcher list. - */ - ISC_LIST_APPEND(mgr->list, disp, link); - - mgr_log(mgr, LVL(90), "created UDP dispatcher %p", disp); - dispatch_log(disp, LVL(90), "created task %p", disp->task); - dispatch_log(disp, LVL(90), "created socket %p", disp->socket); - - *dispp = disp; - - return (ISC_R_SUCCESS); - - /* - * Error returns. - */ - kill_task: - isc_task_detach(&disp->task); - kill_socket: - isc_socket_detach(&disp->socket); - deallocate_dispatch: - dispatch_free(&disp); - - return (result); -} - -void -dns_dispatch_attach(dns_dispatch_t *disp, dns_dispatch_t **dispp) { - REQUIRE(VALID_DISPATCH(disp)); - REQUIRE(dispp != NULL && *dispp == NULL); - - LOCK(&disp->lock); - disp->refcount++; - UNLOCK(&disp->lock); - - *dispp = disp; -} - -/* - * It is important to lock the manager while we are deleting the dispatch, - * since dns_dispatch_getudp will call dispatch_find, which returns to - * the caller a dispatch but does not attach to it until later. _getudp - * locks the manager, however, so locking it here will keep us from attaching - * to a dispatcher that is in the process of going away. - */ -void -dns_dispatch_detach(dns_dispatch_t **dispp) { - dns_dispatch_t *disp; - isc_boolean_t killit; - - REQUIRE(dispp != NULL && VALID_DISPATCH(*dispp)); - - disp = *dispp; - *dispp = NULL; - - LOCK(&disp->lock); - - INSIST(disp->refcount > 0); - disp->refcount--; - killit = ISC_FALSE; - if (disp->refcount == 0) { - if (disp->recv_pending > 0) - isc_socket_cancel(disp->socket, disp->task, - ISC_SOCKCANCEL_RECV); - disp->shutting_down = 1; - } - - dispatch_log(disp, LVL(90), "detach: refcount %d", disp->refcount); - - killit = destroy_disp_ok(disp); - UNLOCK(&disp->lock); - if (killit) - isc_task_send(disp->task, &disp->ctlevent); -} - -isc_result_t -dns_dispatch_addresponse(dns_dispatch_t *disp, isc_sockaddr_t *dest, - isc_task_t *task, isc_taskaction_t action, void *arg, - dns_messageid_t *idp, dns_dispentry_t **resp) -{ - dns_dispentry_t *res; - unsigned int bucket; - dns_messageid_t id; - int i; - isc_boolean_t ok; - dns_qid_t *qid; - - REQUIRE(VALID_DISPATCH(disp)); - REQUIRE(task != NULL); - REQUIRE(dest != NULL); - REQUIRE(resp != NULL && *resp == NULL); - REQUIRE(idp != NULL); - - LOCK(&disp->lock); - - if (disp->shutting_down == 1) { - UNLOCK(&disp->lock); - return (ISC_R_SHUTTINGDOWN); - } - - if (disp->requests >= disp->maxrequests) { - UNLOCK(&disp->lock); - return (ISC_R_QUOTA); - } - - /* - * Try somewhat hard to find an unique ID. - */ - qid = DNS_QID(disp); - LOCK(&qid->lock); - id = dns_randomid(qid); - bucket = dns_hash(qid, dest, id); - ok = ISC_FALSE; - for (i = 0; i < 64; i++) { - if (bucket_search(qid, dest, id, bucket) == NULL) { - ok = ISC_TRUE; - break; - } - id += qid->qid_increment; - id &= 0x0000ffff; - bucket = dns_hash(qid, dest, id); - } - - if (!ok) { - UNLOCK(&qid->lock); - UNLOCK(&disp->lock); - return (ISC_R_NOMORE); - } - - res = isc_mempool_get(disp->mgr->rpool); - if (res == NULL) { - UNLOCK(&qid->lock); - UNLOCK(&disp->lock); - return (ISC_R_NOMEMORY); - } - - disp->refcount++; - disp->requests++; - res->task = NULL; - isc_task_attach(task, &res->task); - res->disp = disp; - res->id = id; - res->bucket = bucket; - res->host = *dest; - res->action = action; - res->arg = arg; - res->item_out = ISC_FALSE; - ISC_LIST_INIT(res->items); - ISC_LINK_INIT(res, link); - res->magic = RESPONSE_MAGIC; - ISC_LIST_APPEND(qid->qid_table[bucket], res, link); - UNLOCK(&qid->lock); - - request_log(disp, res, LVL(90), - "attached to task %p", res->task); - - if (((disp->attributes & DNS_DISPATCHATTR_UDP) != 0) || - ((disp->attributes & DNS_DISPATCHATTR_CONNECTED) != 0)) - startrecv(disp); - - UNLOCK(&disp->lock); - - *idp = id; - *resp = res; - - return (ISC_R_SUCCESS); -} - -void -dns_dispatch_starttcp(dns_dispatch_t *disp) { - - REQUIRE(VALID_DISPATCH(disp)); - - dispatch_log(disp, LVL(90), "starttcp %p", disp->task); - - LOCK(&disp->lock); - disp->attributes |= DNS_DISPATCHATTR_CONNECTED; - startrecv(disp); - UNLOCK(&disp->lock); -} - -void -dns_dispatch_removeresponse(dns_dispentry_t **resp, - dns_dispatchevent_t **sockevent) -{ - dns_dispatchmgr_t *mgr; - dns_dispatch_t *disp; - dns_dispentry_t *res; - dns_dispatchevent_t *ev; - unsigned int bucket; - isc_boolean_t killit; - unsigned int n; - isc_eventlist_t events; - dns_qid_t *qid; - - REQUIRE(resp != NULL); - REQUIRE(VALID_RESPONSE(*resp)); - - res = *resp; - *resp = NULL; - - disp = res->disp; - REQUIRE(VALID_DISPATCH(disp)); - mgr = disp->mgr; - REQUIRE(VALID_DISPATCHMGR(mgr)); - - qid = DNS_QID(disp); - - if (sockevent != NULL) { - REQUIRE(*sockevent != NULL); - ev = *sockevent; - *sockevent = NULL; - } else { - ev = NULL; - } - - LOCK(&disp->lock); - - INSIST(disp->requests > 0); - disp->requests--; - INSIST(disp->refcount > 0); - disp->refcount--; - killit = ISC_FALSE; - if (disp->refcount == 0) { - if (disp->recv_pending > 0) - isc_socket_cancel(disp->socket, disp->task, - ISC_SOCKCANCEL_RECV); - disp->shutting_down = 1; - } - - bucket = res->bucket; - - LOCK(&qid->lock); - ISC_LIST_UNLINK(qid->qid_table[bucket], res, link); - UNLOCK(&qid->lock); - - if (ev == NULL && res->item_out) { - /* - * We've posted our event, but the caller hasn't gotten it - * yet. Take it back. - */ - ISC_LIST_INIT(events); - n = isc_task_unsend(res->task, res, DNS_EVENT_DISPATCH, - NULL, &events); - /* - * We had better have gotten it back. - */ - INSIST(n == 1); - ev = (dns_dispatchevent_t *)ISC_LIST_HEAD(events); - } - - if (ev != NULL) { - REQUIRE(res->item_out == ISC_TRUE); - res->item_out = ISC_FALSE; - if (ev->buffer.base != NULL) - free_buffer(disp, ev->buffer.base, ev->buffer.length); - free_event(disp, ev); - } - - request_log(disp, res, LVL(90), "detaching from task %p", res->task); - isc_task_detach(&res->task); - - /* - * Free any buffered requests as well - */ - ev = ISC_LIST_HEAD(res->items); - while (ev != NULL) { - ISC_LIST_UNLINK(res->items, ev, ev_link); - if (ev->buffer.base != NULL) - free_buffer(disp, ev->buffer.base, ev->buffer.length); - free_event(disp, ev); - ev = ISC_LIST_HEAD(res->items); - } - res->magic = 0; - isc_mempool_put(disp->mgr->rpool, res); - if (disp->shutting_down == 1) - do_cancel(disp); - else - startrecv(disp); - - killit = destroy_disp_ok(disp); - UNLOCK(&disp->lock); - if (killit) - isc_task_send(disp->task, &disp->ctlevent); -} - -static void -do_cancel(dns_dispatch_t *disp) { - dns_dispatchevent_t *ev; - dns_dispentry_t *resp; - dns_qid_t *qid; - - if (disp->shutdown_out == 1) - return; - - qid = DNS_QID(disp); - - /* - * Search for the first response handler without packets outstanding. - */ - LOCK(&qid->lock); - for (resp = linear_first(qid); - resp != NULL && resp->item_out != ISC_FALSE; - /* Empty. */) - resp = linear_next(qid, resp); - /* - * No one to send the cancel event to, so nothing to do. - */ - if (resp == NULL) - goto unlock; - - /* - * Send the shutdown failsafe event to this resp. - */ - ev = disp->failsafe_ev; - ISC_EVENT_INIT(ev, sizeof(*ev), 0, NULL, DNS_EVENT_DISPATCH, - resp->action, resp->arg, resp, NULL, NULL); - ev->result = disp->shutdown_why; - ev->buffer.base = NULL; - ev->buffer.length = 0; - disp->shutdown_out = 1; - request_log(disp, resp, LVL(10), - "cancel: failsafe event %p -> task %p", - ev, resp->task); - resp->item_out = ISC_TRUE; - isc_task_send(resp->task, ISC_EVENT_PTR(&ev)); - unlock: - UNLOCK(&qid->lock); -} - -isc_socket_t * -dns_dispatch_getsocket(dns_dispatch_t *disp) { - REQUIRE(VALID_DISPATCH(disp)); - - return (disp->socket); -} - -isc_result_t -dns_dispatch_getlocaladdress(dns_dispatch_t *disp, isc_sockaddr_t *addrp) { - - REQUIRE(VALID_DISPATCH(disp)); - REQUIRE(addrp != NULL); - - if (disp->socktype == isc_sockettype_udp) { - *addrp = disp->local; - return (ISC_R_SUCCESS); - } - return (ISC_R_NOTIMPLEMENTED); -} - -void -dns_dispatch_cancel(dns_dispatch_t *disp) { - REQUIRE(VALID_DISPATCH(disp)); - - LOCK(&disp->lock); - - if (disp->shutting_down == 1) { - UNLOCK(&disp->lock); - return; - } - - disp->shutdown_why = ISC_R_CANCELED; - disp->shutting_down = 1; - do_cancel(disp); - - UNLOCK(&disp->lock); - - return; -} - -void -dns_dispatch_changeattributes(dns_dispatch_t *disp, - unsigned int attributes, unsigned int mask) -{ - REQUIRE(VALID_DISPATCH(disp)); - - /* XXXMLG - * Should check for valid attributes here! - */ - - LOCK(&disp->lock); - - if ((mask & DNS_DISPATCHATTR_NOLISTEN) != 0) { - if ((disp->attributes & DNS_DISPATCHATTR_NOLISTEN) != 0 && - (attributes & DNS_DISPATCHATTR_NOLISTEN) == 0) { - disp->attributes &= ~DNS_DISPATCHATTR_NOLISTEN; - startrecv(disp); - } else if ((disp->attributes & DNS_DISPATCHATTR_NOLISTEN) - == 0 && - (attributes & DNS_DISPATCHATTR_NOLISTEN) != 0) { - disp->attributes |= DNS_DISPATCHATTR_NOLISTEN; - if (disp->recv_pending != 0) - isc_socket_cancel(disp->socket, disp->task, - ISC_SOCKCANCEL_RECV); - } - } - - disp->attributes &= ~mask; - disp->attributes |= (attributes & mask); - UNLOCK(&disp->lock); -} - -void -dns_dispatch_importrecv(dns_dispatch_t *disp, isc_event_t *event) { - void *buf; - isc_socketevent_t *sevent, *newsevent; - - REQUIRE(VALID_DISPATCH(disp)); - REQUIRE((disp->attributes & DNS_DISPATCHATTR_NOLISTEN) != 0); - REQUIRE(event != NULL); - - sevent = (isc_socketevent_t *)event; - - INSIST(sevent->n <= disp->mgr->buffersize); - newsevent = (isc_socketevent_t *) - isc_event_allocate(disp->mgr->mctx, NULL, - DNS_EVENT_IMPORTRECVDONE, udp_recv, - disp, sizeof(isc_socketevent_t)); - if (newsevent == NULL) - return; - - buf = allocate_udp_buffer(disp); - if (buf == NULL) { - isc_event_free(ISC_EVENT_PTR(&newsevent)); - return; - } - memcpy(buf, sevent->region.base, sevent->n); - newsevent->region.base = buf; - newsevent->region.length = disp->mgr->buffersize; - newsevent->n = sevent->n; - newsevent->result = sevent->result; - newsevent->address = sevent->address; - newsevent->timestamp = sevent->timestamp; - newsevent->pktinfo = sevent->pktinfo; - newsevent->attributes = sevent->attributes; - - isc_task_send(disp->task, ISC_EVENT_PTR(&newsevent)); -} - -#if 0 -void -dns_dispatchmgr_dump(dns_dispatchmgr_t *mgr) { - dns_dispatch_t *disp; - char foo[1024]; - - disp = ISC_LIST_HEAD(mgr->list); - while (disp != NULL) { - isc_sockaddr_format(&disp->local, foo, sizeof(foo)); - printf("\tdispatch %p, addr %s\n", disp, foo); - disp = ISC_LIST_NEXT(disp, link); - } -} -#endif |