diff options
Diffstat (limited to 'daemon/worker.c')
| -rw-r--r-- | daemon/worker.c | 2252 |
1 files changed, 2252 insertions, 0 deletions
diff --git a/daemon/worker.c b/daemon/worker.c new file mode 100644 index 0000000..8b6b49e --- /dev/null +++ b/daemon/worker.c @@ -0,0 +1,2252 @@ +/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz> + * SPDX-License-Identifier: GPL-3.0-or-later + */ + +#include "kresconfig.h" +#include "daemon/worker.h" + +#include <uv.h> +#include <lua.h> +#include <lauxlib.h> +#include <libknot/packet/pkt.h> +#include <libknot/descriptor.h> +#include <contrib/cleanup.h> +#include <contrib/ucw/lib.h> +#include <contrib/ucw/mempool.h> +#if defined(__GLIBC__) && defined(_GNU_SOURCE) +#include <malloc.h> +#endif +#include <sys/types.h> +#include <unistd.h> +#include <gnutls/gnutls.h> + +#if ENABLE_XDP + #include <libknot/xdp/xdp.h> +#endif + +#include "daemon/bindings/api.h" +#include "daemon/engine.h" +#include "daemon/io.h" +#include "daemon/proxyv2.h" +#include "daemon/session.h" +#include "daemon/tls.h" +#include "daemon/http.h" +#include "daemon/udp_queue.h" +#include "lib/layer.h" +#include "lib/utils.h" + + +/* Magic defaults for the worker. */ +#ifndef MAX_PIPELINED +#define MAX_PIPELINED 100 +#endif + +#define VERBOSE_MSG(qry, ...) kr_log_q(qry, WORKER, __VA_ARGS__) + +/** Client request state. */ +struct request_ctx +{ + struct kr_request req; + + struct worker_ctx *worker; + struct qr_task *task; + struct { + /** NULL if the request didn't come over network. */ + struct session *session; + /** Requestor's address; separate because of UDP session "sharing". */ + union kr_sockaddr addr; + /** Request communication address; if not from a proxy, same as addr. */ + union kr_sockaddr comm_addr; + /** Local address. For AF_XDP we couldn't use session's, + * as the address might be different every time. */ + union kr_sockaddr dst_addr; + /** MAC addresses - ours [0] and router's [1], in case of AF_XDP socket. */ + uint8_t eth_addrs[2][6]; + } source; +}; + +/** Query resolution task. */ +struct qr_task +{ + struct request_ctx *ctx; + knot_pkt_t *pktbuf; + qr_tasklist_t waiting; + struct session *pending[MAX_PENDING]; + uint16_t pending_count; + uint16_t timeouts; + uint16_t iter_count; + uint32_t refs; + bool finished : 1; + bool leading : 1; + uint64_t creation_time; + uint64_t send_time; + uint64_t recv_time; + struct kr_transport *transport; +}; + + +/* Convenience macros */ +#define qr_task_ref(task) \ + do { ++(task)->refs; } while(0) +#define qr_task_unref(task) \ + do { \ + if (task) \ + kr_require((task)->refs > 0); \ + if ((task) && --(task)->refs == 0) \ + qr_task_free((task)); \ + } while (0) + +/* Forward decls */ +static void qr_task_free(struct qr_task *task); +static int qr_task_step(struct qr_task *task, + const struct sockaddr *packet_source, + knot_pkt_t *packet); +static int qr_task_send(struct qr_task *task, struct session *session, + const struct sockaddr *addr, knot_pkt_t *pkt); +static int qr_task_finalize(struct qr_task *task, int state); +static void qr_task_complete(struct qr_task *task); +struct session* worker_find_tcp_connected(struct worker_ctx *worker, + const struct sockaddr *addr); +static int worker_add_tcp_waiting(struct worker_ctx *worker, + const struct sockaddr *addr, + struct session *session); +struct session* worker_find_tcp_waiting(struct worker_ctx *worker, + const struct sockaddr *addr); +static void on_tcp_connect_timeout(uv_timer_t *timer); +static void on_udp_timeout(uv_timer_t *timer); +static void subreq_finalize(struct qr_task *task, const struct sockaddr *packet_source, knot_pkt_t *pkt); + + +struct worker_ctx the_worker_value; /**< Static allocation is suitable for the singleton. */ +struct worker_ctx *the_worker = NULL; + +/*! @internal Create a UDP/TCP handle for an outgoing AF_INET* connection. + * socktype is SOCK_* */ +static uv_handle_t *ioreq_spawn(struct worker_ctx *worker, + int socktype, sa_family_t family, bool has_tls, + bool has_http) +{ + bool precond = (socktype == SOCK_DGRAM || socktype == SOCK_STREAM) + && (family == AF_INET || family == AF_INET6); + if (kr_fails_assert(precond)) { + kr_log_debug(WORKER, "ioreq_spawn: pre-condition failed\n"); + return NULL; + } + + /* Create connection for iterative query */ + uv_handle_t *handle = malloc(socktype == SOCK_DGRAM + ? sizeof(uv_udp_t) : sizeof(uv_tcp_t)); + if (!handle) { + return NULL; + } + int ret = io_create(worker->loop, handle, socktype, family, has_tls, has_http); + if (ret) { + if (ret == UV_EMFILE) { + worker->too_many_open = true; + worker->rconcurrent_highwatermark = worker->stats.rconcurrent; + } + free(handle); + return NULL; + } + + /* Bind to outgoing address, according to IP v4/v6. */ + union kr_sockaddr *addr; + if (family == AF_INET) { + addr = (union kr_sockaddr *)&worker->out_addr4; + } else { + addr = (union kr_sockaddr *)&worker->out_addr6; + } + if (addr->ip.sa_family != AF_UNSPEC) { + if (kr_fails_assert(addr->ip.sa_family == family)) { + io_free(handle); + return NULL; + } + if (socktype == SOCK_DGRAM) { + uv_udp_t *udp = (uv_udp_t *)handle; + ret = uv_udp_bind(udp, &addr->ip, 0); + } else if (socktype == SOCK_STREAM){ + uv_tcp_t *tcp = (uv_tcp_t *)handle; + ret = uv_tcp_bind(tcp, &addr->ip, 0); + } + } + + if (ret != 0) { + io_free(handle); + return NULL; + } + + /* Set current handle as a subrequest type. */ + struct session *session = handle->data; + session_flags(session)->outgoing = true; + /* Connect or issue query datagram */ + return handle; +} + +static void ioreq_kill_pending(struct qr_task *task) +{ + for (uint16_t i = 0; i < task->pending_count; ++i) { + session_kill_ioreq(task->pending[i], task); + } + task->pending_count = 0; +} + +/** Get a mempool. */ +static inline struct mempool *pool_borrow(struct worker_ctx *worker) +{ + /* The implementation used to have extra caching layer, + * but it didn't work well. Now it's very simple. */ + return mp_new(16 * 1024); +} +/** Return a mempool. */ +static inline void pool_release(struct worker_ctx *worker, struct mempool *mp) +{ + mp_delete(mp); +} + +/** Create a key for an outgoing subrequest: qname, qclass, qtype. + * @param key Destination buffer for key size, MUST be SUBREQ_KEY_LEN or larger. + * @return key length if successful or an error + */ +static const size_t SUBREQ_KEY_LEN = KR_RRKEY_LEN; +static int subreq_key(char *dst, knot_pkt_t *pkt) +{ + kr_require(pkt); + return kr_rrkey(dst, knot_pkt_qclass(pkt), knot_pkt_qname(pkt), + knot_pkt_qtype(pkt), knot_pkt_qtype(pkt)); +} + +#if ENABLE_XDP +static uint8_t *alloc_wire_cb(struct kr_request *req, uint16_t *maxlen) +{ + if (kr_fails_assert(maxlen)) + return NULL; + struct request_ctx *ctx = (struct request_ctx *)req; + /* We know it's an AF_XDP socket; otherwise this CB isn't assigned. */ + uv_handle_t *handle = session_get_handle(ctx->source.session); + if (kr_fails_assert(handle->type == UV_POLL)) + return NULL; + xdp_handle_data_t *xhd = handle->data; + knot_xdp_msg_t out; + bool ipv6 = ctx->source.comm_addr.ip.sa_family == AF_INET6; + int ret = knot_xdp_send_alloc(xhd->socket, + #if KNOT_VERSION_HEX >= 0x030100 + ipv6 ? KNOT_XDP_MSG_IPV6 : 0, &out); + #else + ipv6, &out, NULL); + #endif + if (ret != KNOT_EOK) { + kr_assert(ret == KNOT_ENOMEM); + *maxlen = 0; + return NULL; + } + *maxlen = MIN(*maxlen, out.payload.iov_len); +#if KNOT_VERSION_HEX < 0x030100 + /* It's most convenient to fill the MAC addresses at this point. */ + memcpy(out.eth_from, &ctx->source.eth_addrs[0], 6); + memcpy(out.eth_to, &ctx->source.eth_addrs[1], 6); +#endif + return out.payload.iov_base; +} +static void free_wire(const struct request_ctx *ctx) +{ + if (kr_fails_assert(ctx->req.alloc_wire_cb == alloc_wire_cb)) + return; + knot_pkt_t *ans = ctx->req.answer; + if (unlikely(ans == NULL)) /* dropped */ + return; + if (likely(ans->wire == NULL)) /* sent most likely */ + return; + /* We know it's an AF_XDP socket; otherwise alloc_wire_cb isn't assigned. */ + uv_handle_t *handle = session_get_handle(ctx->source.session); + if (kr_fails_assert(handle->type == UV_POLL)) + return; + xdp_handle_data_t *xhd = handle->data; + /* Freeing is done by sending an empty packet (the API won't really send it). */ + knot_xdp_msg_t out; + out.payload.iov_base = ans->wire; + out.payload.iov_len = 0; + uint32_t sent = 0; +#if KNOT_VERSION_HEX >= 0x030100 + int ret = 0; + knot_xdp_send_free(xhd->socket, &out, 1); +#else + int ret = knot_xdp_send(xhd->socket, &out, 1, &sent); +#endif + kr_assert(ret == KNOT_EOK && sent == 0); + kr_log_debug(XDP, "freed unsent buffer, ret = %d\n", ret); +} +#endif +/* Helper functions for transport selection */ +static inline bool is_tls_capable(struct sockaddr *address) { + tls_client_param_t *tls_entry = tls_client_param_get(the_worker->engine->net.tls_client_params, address); + return tls_entry; +} + +static inline bool is_tcp_connected(struct sockaddr *address) { + return worker_find_tcp_connected(the_worker, address); +} + +static inline bool is_tcp_waiting(struct sockaddr *address) { + return worker_find_tcp_waiting(the_worker, address); +} + +/** Create and initialize a request_ctx (on a fresh mempool). + * + * session and addr point to the source of the request, and they are NULL + * in case the request didn't come from network. + */ +static struct request_ctx *request_create(struct worker_ctx *worker, + struct session *session, + struct io_comm_data *comm, + const uint8_t *eth_from, + const uint8_t *eth_to, + uint32_t uid) +{ + knot_mm_t pool = { + .ctx = pool_borrow(worker), + .alloc = (knot_mm_alloc_t) mp_alloc + }; + + /* Create request context */ + struct request_ctx *ctx = mm_calloc(&pool, 1, sizeof(*ctx)); + if (!ctx) { + pool_release(worker, pool.ctx); + return NULL; + } + + /* TODO Relocate pool to struct request */ + ctx->worker = worker; + if (session && kr_fails_assert(session_flags(session)->outgoing == false)) { + pool_release(worker, pool.ctx); + return NULL; + } + ctx->source.session = session; + if (kr_fails_assert(!!eth_to == !!eth_from)) { + pool_release(worker, pool.ctx); + return NULL; + } + const bool is_xdp = eth_to != NULL; + if (is_xdp) { + #if ENABLE_XDP + if (kr_fails_assert(session)) { + pool_release(worker, pool.ctx); + return NULL; + } + memcpy(&ctx->source.eth_addrs[0], eth_to, sizeof(ctx->source.eth_addrs[0])); + memcpy(&ctx->source.eth_addrs[1], eth_from, sizeof(ctx->source.eth_addrs[1])); + ctx->req.alloc_wire_cb = alloc_wire_cb; + #else + kr_assert(!EINVAL); + pool_release(worker, pool.ctx); + return NULL; + #endif + } + + struct kr_request *req = &ctx->req; + req->pool = pool; + req->vars_ref = LUA_NOREF; + req->uid = uid; + req->qsource.comm_flags.xdp = is_xdp; + kr_request_set_extended_error(req, KNOT_EDNS_EDE_NONE, NULL); + array_init(req->qsource.headers); + if (session) { + kr_require(comm); + + const struct sockaddr *src_addr = comm->src_addr; + const struct sockaddr *comm_addr = comm->comm_addr; + const struct sockaddr *dst_addr = comm->dst_addr; + const struct proxy_result *proxy = comm->proxy; + + req->qsource.comm_flags.tcp = session_get_handle(session)->type == UV_TCP; + req->qsource.comm_flags.tls = session_flags(session)->has_tls; + req->qsource.comm_flags.http = session_flags(session)->has_http; + + req->qsource.flags = req->qsource.comm_flags; + if (proxy) { + req->qsource.flags.tcp = proxy->protocol == SOCK_STREAM; + req->qsource.flags.tls = proxy->has_tls; + } + + req->qsource.stream_id = -1; +#if ENABLE_DOH2 + if (req->qsource.comm_flags.http) { + struct http_ctx *http_ctx = session_http_get_server_ctx(session); + struct http_stream stream = queue_head(http_ctx->streams); + req->qsource.stream_id = stream.id; + if (stream.headers) { + req->qsource.headers = *stream.headers; + free(stream.headers); + stream.headers = NULL; + } + } +#endif + /* We need to store a copy of peer address. */ + memcpy(&ctx->source.addr.ip, src_addr, kr_sockaddr_len(src_addr)); + req->qsource.addr = &ctx->source.addr.ip; + + if (!comm_addr) + comm_addr = src_addr; + memcpy(&ctx->source.comm_addr.ip, comm_addr, kr_sockaddr_len(comm_addr)); + req->qsource.comm_addr = &ctx->source.comm_addr.ip; + + if (!dst_addr) /* We wouldn't have to copy in this case, but for consistency. */ + dst_addr = session_get_sockname(session); + memcpy(&ctx->source.dst_addr.ip, dst_addr, kr_sockaddr_len(dst_addr)); + req->qsource.dst_addr = &ctx->source.dst_addr.ip; + } + + req->selection_context.is_tls_capable = is_tls_capable; + req->selection_context.is_tcp_connected = is_tcp_connected; + req->selection_context.is_tcp_waiting = is_tcp_waiting; + array_init(req->selection_context.forwarding_targets); + array_reserve_mm(req->selection_context.forwarding_targets, 1, kr_memreserve, &req->pool); + + worker->stats.rconcurrent += 1; + + return ctx; +} + +/** More initialization, related to the particular incoming query/packet. */ +static int request_start(struct request_ctx *ctx, knot_pkt_t *query) +{ + if (kr_fails_assert(query && ctx)) + return kr_error(EINVAL); + + struct kr_request *req = &ctx->req; + req->qsource.size = query->size; + if (knot_pkt_has_tsig(query)) { + req->qsource.size += query->tsig_wire.len; + } + + knot_pkt_t *pkt = knot_pkt_new(NULL, req->qsource.size, &req->pool); + if (!pkt) { + return kr_error(ENOMEM); + } + + int ret = knot_pkt_copy(pkt, query); + if (ret != KNOT_EOK && ret != KNOT_ETRAIL) { + return kr_error(ENOMEM); + } + req->qsource.packet = pkt; + + /* Start resolution */ + struct worker_ctx *worker = ctx->worker; + struct engine *engine = worker->engine; + kr_resolve_begin(req, &engine->resolver); + worker->stats.queries += 1; + return kr_ok(); +} + +static void request_free(struct request_ctx *ctx) +{ + struct worker_ctx *worker = ctx->worker; + /* Dereference any Lua vars table if exists */ + if (ctx->req.vars_ref != LUA_NOREF) { + lua_State *L = worker->engine->L; + /* Get worker variables table */ + lua_rawgeti(L, LUA_REGISTRYINDEX, worker->vars_table_ref); + /* Get next free element (position 0) and store it under current reference (forming a list) */ + lua_rawgeti(L, -1, 0); + lua_rawseti(L, -2, ctx->req.vars_ref); + /* Set current reference as the next free element */ + lua_pushinteger(L, ctx->req.vars_ref); + lua_rawseti(L, -2, 0); + lua_pop(L, 1); + ctx->req.vars_ref = LUA_NOREF; + } + /* Free HTTP/2 headers for DoH requests. */ + for(int i = 0; i < ctx->req.qsource.headers.len; i++) { + free(ctx->req.qsource.headers.at[i].name); + free(ctx->req.qsource.headers.at[i].value); + } + array_clear(ctx->req.qsource.headers); + + /* Make sure to free XDP buffer in case it wasn't sent. */ + if (ctx->req.alloc_wire_cb) { + #if ENABLE_XDP + free_wire(ctx); + #else + kr_assert(!EINVAL); + #endif + } + /* Return mempool to ring or free it if it's full */ + pool_release(worker, ctx->req.pool.ctx); + /* @note The 'task' is invalidated from now on. */ + worker->stats.rconcurrent -= 1; +} + +static struct qr_task *qr_task_create(struct request_ctx *ctx) +{ + /* Choose (initial) pktbuf size. As it is now, pktbuf can be used + * for UDP answers from upstream *and* from cache + * and for sending queries upstream */ + uint16_t pktbuf_max = KR_EDNS_PAYLOAD; + const knot_rrset_t *opt_our = ctx->worker->engine->resolver.upstream_opt_rr; + if (opt_our) { + pktbuf_max = MAX(pktbuf_max, knot_edns_get_payload(opt_our)); + } + + /* Create resolution task */ + struct qr_task *task = mm_calloc(&ctx->req.pool, 1, sizeof(*task)); + if (!task) { + return NULL; + } + + /* Create packet buffers for answer and subrequests */ + knot_pkt_t *pktbuf = knot_pkt_new(NULL, pktbuf_max, &ctx->req.pool); + if (!pktbuf) { + mm_free(&ctx->req.pool, task); + return NULL; + } + pktbuf->size = 0; + + task->ctx = ctx; + task->pktbuf = pktbuf; + array_init(task->waiting); + task->refs = 0; + kr_assert(ctx->task == NULL); + ctx->task = task; + /* Make the primary reference to task. */ + qr_task_ref(task); + task->creation_time = kr_now(); + ctx->worker->stats.concurrent += 1; + return task; +} + +/* This is called when the task refcount is zero, free memory. */ +static void qr_task_free(struct qr_task *task) +{ + struct request_ctx *ctx = task->ctx; + + if (kr_fails_assert(ctx)) + return; + + struct worker_ctx *worker = ctx->worker; + + if (ctx->task == NULL) { + request_free(ctx); + } + + /* Update stats */ + worker->stats.concurrent -= 1; +} + +/*@ Register new qr_task within session. */ +static int qr_task_register(struct qr_task *task, struct session *session) +{ + if (kr_fails_assert(!session_flags(session)->outgoing && session_get_handle(session)->type == UV_TCP)) + return kr_error(EINVAL); + + session_tasklist_add(session, task); + + struct request_ctx *ctx = task->ctx; + if (kr_fails_assert(ctx && (ctx->source.session == NULL || ctx->source.session == session))) + return kr_error(EINVAL); + ctx->source.session = session; + /* Soft-limit on parallel queries, there is no "slow down" RCODE + * that we could use to signalize to client, but we can stop reading, + * an in effect shrink TCP window size. To get more precise throttling, + * we would need to copy remainder of the unread buffer and reassemble + * when resuming reading. This is NYI. */ + if (session_tasklist_get_len(session) >= task->ctx->worker->tcp_pipeline_max && + !session_flags(session)->throttled && !session_flags(session)->closing) { + session_stop_read(session); + session_flags(session)->throttled = true; + } + + return 0; +} + +static void qr_task_complete(struct qr_task *task) +{ + struct request_ctx *ctx = task->ctx; + + /* Kill pending I/O requests */ + ioreq_kill_pending(task); + kr_require(task->waiting.len == 0); + kr_require(task->leading == false); + + struct session *s = ctx->source.session; + if (s) { + kr_require(!session_flags(s)->outgoing && session_waitinglist_is_empty(s)); + ctx->source.session = NULL; + session_tasklist_del(s, task); + } + + /* Release primary reference to task. */ + if (ctx->task == task) { + ctx->task = NULL; + qr_task_unref(task); + } +} + +/* This is called when we send subrequest / answer */ +int qr_task_on_send(struct qr_task *task, const uv_handle_t *handle, int status) +{ + if (task->finished) { + kr_require(task->leading == false); + qr_task_complete(task); + } + + if (!handle || kr_fails_assert(handle->data)) + return status; + struct session* s = handle->data; + + if (handle->type == UV_UDP && session_flags(s)->outgoing) { + // This should ensure that we are only dealing with our question to upstream + if (kr_fails_assert(!knot_wire_get_qr(task->pktbuf->wire))) + return status; + // start the timer + struct kr_query *qry = array_tail(task->ctx->req.rplan.pending); + if (kr_fails_assert(qry && task->transport)) + return status; + size_t timeout = task->transport->timeout; + int ret = session_timer_start(s, on_udp_timeout, timeout, 0); + /* Start next step with timeout, fatal if can't start a timer. */ + if (ret != 0) { + subreq_finalize(task, &task->transport->address.ip, task->pktbuf); + qr_task_finalize(task, KR_STATE_FAIL); + } + } + + if (handle->type == UV_TCP) { + if (status != 0) { // session probably not usable anymore; typically: ECONNRESET + const struct kr_request *req = &task->ctx->req; + if (kr_log_is_debug(WORKER, req)) { + const char *peer_str = NULL; + if (!session_flags(s)->outgoing) { + peer_str = "hidden"; // avoid logging downstream IPs + } else if (task->transport) { + peer_str = kr_straddr(&task->transport->address.ip); + } + if (!peer_str) + peer_str = "unknown"; // probably shouldn't happen + kr_log_req(req, 0, 0, WORKER, + "=> disconnected from '%s': %s\n", + peer_str, uv_strerror(status)); + } + worker_end_tcp(s); + return status; + } + + if (session_flags(s)->outgoing || session_flags(s)->closing) + return status; + + struct worker_ctx *worker = task->ctx->worker; + if (session_flags(s)->throttled && + session_tasklist_get_len(s) < worker->tcp_pipeline_max/2) { + /* Start reading again if the session is throttled and + * the number of outgoing requests is below watermark. */ + session_start_read(s); + session_flags(s)->throttled = false; + } + } + + return status; +} + +static void on_send(uv_udp_send_t *req, int status) +{ + struct qr_task *task = req->data; + uv_handle_t *h = (uv_handle_t *)req->handle; + qr_task_on_send(task, h, status); + qr_task_unref(task); + free(req); +} + +static void on_write(uv_write_t *req, int status) +{ + struct qr_task *task = req->data; + uv_handle_t *h = (uv_handle_t *)req->handle; + qr_task_on_send(task, h, status); + qr_task_unref(task); + free(req); +} + +static int qr_task_send(struct qr_task *task, struct session *session, + const struct sockaddr *addr, knot_pkt_t *pkt) +{ + if (!session) + return qr_task_on_send(task, NULL, kr_error(EIO)); + + int ret = 0; + struct request_ctx *ctx = task->ctx; + + uv_handle_t *handle = session_get_handle(session); + if (kr_fails_assert(handle && handle->data == session)) + return qr_task_on_send(task, NULL, kr_error(EINVAL)); + const bool is_stream = handle->type == UV_TCP; + kr_require(is_stream || handle->type == UV_UDP); + + if (addr == NULL) + addr = session_get_peer(session); + + if (pkt == NULL) + pkt = worker_task_get_pktbuf(task); + + if (session_flags(session)->outgoing && handle->type == UV_TCP) { + size_t try_limit = session_tasklist_get_len(session) + 1; + uint16_t msg_id = knot_wire_get_id(pkt->wire); + size_t try_count = 0; + while (session_tasklist_find_msgid(session, msg_id) && + try_count <= try_limit) { + ++msg_id; + ++try_count; + } + if (try_count > try_limit) + return kr_error(ENOENT); + worker_task_pkt_set_msgid(task, msg_id); + } + + struct worker_ctx *worker = ctx->worker; + /* Note time for upstream RTT */ + task->send_time = kr_now(); + task->recv_time = 0; // task structure is being reused so we have to zero this out here + /* Send using given protocol */ + if (kr_fails_assert(!session_flags(session)->closing)) + return qr_task_on_send(task, NULL, kr_error(EIO)); + + uv_handle_t *ioreq = malloc(is_stream ? sizeof(uv_write_t) : sizeof(uv_udp_send_t)); + if (!ioreq) + return qr_task_on_send(task, handle, kr_error(ENOMEM)); + + /* Pending ioreq on current task */ + qr_task_ref(task); + + if (session_flags(session)->has_http) { +#if ENABLE_DOH2 + uv_write_t *write_req = (uv_write_t *)ioreq; + write_req->data = task; + ret = http_write(write_req, handle, pkt, ctx->req.qsource.stream_id, &on_write); +#else + ret = kr_error(ENOPROTOOPT); +#endif + } else if (session_flags(session)->has_tls) { + uv_write_t *write_req = (uv_write_t *)ioreq; + write_req->data = task; + ret = tls_write(write_req, handle, pkt, &on_write); + } else if (handle->type == UV_UDP) { + uv_udp_send_t *send_req = (uv_udp_send_t *)ioreq; + uv_buf_t buf = { (char *)pkt->wire, pkt->size }; + send_req->data = task; + ret = uv_udp_send(send_req, (uv_udp_t *)handle, &buf, 1, addr, &on_send); + } else if (handle->type == UV_TCP) { + uv_write_t *write_req = (uv_write_t *)ioreq; + /* We need to write message length in native byte order, + * but we don't have a convenient place to store those bytes. + * The problem is that all memory referenced from buf[] MUST retain + * its contents at least until on_write() is called, and I currently + * can't see any convenient place outside the `pkt` structure. + * So we use directly the *individual* bytes in pkt->size. + * The call to htonl() and the condition will probably be inlinable. */ + int lsbi, slsbi; /* (second) least significant byte index */ + if (htonl(1) == 1) { /* big endian */ + lsbi = sizeof(pkt->size) - 1; + slsbi = sizeof(pkt->size) - 2; + } else { + lsbi = 0; + slsbi = 1; + } + uv_buf_t buf[3] = { + { (char *)&pkt->size + slsbi, 1 }, + { (char *)&pkt->size + lsbi, 1 }, + { (char *)pkt->wire, pkt->size }, + }; + write_req->data = task; + ret = uv_write(write_req, (uv_stream_t *)handle, buf, 3, &on_write); + } else { + kr_assert(false); + } + + if (ret == 0) { + session_touch(session); + if (session_flags(session)->outgoing) { + session_tasklist_add(session, task); + } + if (worker->too_many_open && + worker->stats.rconcurrent < + worker->rconcurrent_highwatermark - 10) { + worker->too_many_open = false; + } + } else { + free(ioreq); + qr_task_unref(task); + if (ret == UV_EMFILE) { + worker->too_many_open = true; + worker->rconcurrent_highwatermark = worker->stats.rconcurrent; + ret = kr_error(UV_EMFILE); + } + + if (session_flags(session)->has_http) + worker->stats.err_http += 1; + else if (session_flags(session)->has_tls) + worker->stats.err_tls += 1; + else if (handle->type == UV_UDP) + worker->stats.err_udp += 1; + else + worker->stats.err_tcp += 1; + } + + /* Update outgoing query statistics */ + if (session_flags(session)->outgoing && addr) { + if (session_flags(session)->has_tls) + worker->stats.tls += 1; + else if (handle->type == UV_UDP) + worker->stats.udp += 1; + else + worker->stats.tcp += 1; + + if (addr->sa_family == AF_INET6) + worker->stats.ipv6 += 1; + else if (addr->sa_family == AF_INET) + worker->stats.ipv4 += 1; + } + return ret; +} + +static struct kr_query *task_get_last_pending_query(struct qr_task *task) +{ + if (!task || task->ctx->req.rplan.pending.len == 0) { + return NULL; + } + + return array_tail(task->ctx->req.rplan.pending); +} + +static int session_tls_hs_cb(struct session *session, int status) +{ + if (kr_fails_assert(session_flags(session)->outgoing)) + return kr_error(EINVAL); + struct sockaddr *peer = session_get_peer(session); + int deletion_res = worker_del_tcp_waiting(the_worker, peer); + int ret = kr_ok(); + + if (status) { + struct qr_task *task = session_waitinglist_get(session); + if (task) { + // TLS handshake failed, report it to server selection + struct kr_query *qry = array_tail(task->ctx->req.rplan.pending); + qry->server_selection.error(qry, task->transport, KR_SELECTION_TLS_HANDSHAKE_FAILED); + } +#ifndef NDEBUG + else { + /* Task isn't in the list of tasks + * waiting for connection to upstream. + * So that it MUST be unsuccessful rehandshake. + * Check it. */ + kr_require(deletion_res != 0); + struct kr_sockaddr_key_storage key; + ssize_t keylen = kr_sockaddr_key(&key, peer); + if (keylen < 0) + return keylen; + trie_val_t *val; + kr_require((val = trie_get_try(the_worker->tcp_connected, key.bytes, keylen)) && *val); + } +#endif + return ret; + } + + /* handshake was completed successfully */ + struct tls_client_ctx *tls_client_ctx = session_tls_get_client_ctx(session); + tls_client_param_t *tls_params = tls_client_ctx->params; + gnutls_session_t tls_session = tls_client_ctx->c.tls_session; + if (gnutls_session_is_resumed(tls_session) != 0) { + kr_log_debug(TLSCLIENT, "TLS session has resumed\n"); + } else { + kr_log_debug(TLSCLIENT, "TLS session has not resumed\n"); + /* session wasn't resumed, delete old session data ... */ + if (tls_params->session_data.data != NULL) { + gnutls_free(tls_params->session_data.data); + tls_params->session_data.data = NULL; + tls_params->session_data.size = 0; + } + /* ... and get the new session data */ + gnutls_datum_t tls_session_data = { NULL, 0 }; + ret = gnutls_session_get_data2(tls_session, &tls_session_data); + if (ret == 0) { + tls_params->session_data = tls_session_data; + } + } + + struct session *s = worker_find_tcp_connected(the_worker, peer); + ret = kr_ok(); + if (deletion_res == kr_ok()) { + /* peer was in the waiting list, add to the connected list. */ + if (s) { + /* Something went wrong, + * peer already is in the connected list. */ + ret = kr_error(EINVAL); + } else { + ret = worker_add_tcp_connected(the_worker, peer, session); + } + } else { + /* peer wasn't in the waiting list. + * It can be + * 1) either successful rehandshake; in this case peer + * must be already in the connected list. + * 2) or successful handshake with session, which was timed out + * by on_tcp_connect_timeout(); after successful tcp connection; + * in this case peer isn't in the connected list. + **/ + if (!s || s != session) { + ret = kr_error(EINVAL); + } + } + if (ret == kr_ok()) { + while (!session_waitinglist_is_empty(session)) { + struct qr_task *t = session_waitinglist_get(session); + ret = qr_task_send(t, session, NULL, NULL); + if (ret != 0) { + break; + } + session_waitinglist_pop(session, true); + } + } else { + ret = kr_error(EINVAL); + } + + if (ret != kr_ok()) { + /* Something went wrong. + * Either addition to the list of connected sessions + * or write to upstream failed. */ + worker_del_tcp_connected(the_worker, peer); + session_waitinglist_finalize(session, KR_STATE_FAIL); + session_tasklist_finalize(session, KR_STATE_FAIL); + session_close(session); + } else { + session_timer_stop(session); + session_timer_start(session, tcp_timeout_trigger, + MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY); + } + return kr_ok(); +} + +static int send_waiting(struct session *session) +{ + int ret = 0; + while (!session_waitinglist_is_empty(session)) { + struct qr_task *t = session_waitinglist_get(session); + ret = qr_task_send(t, session, NULL, NULL); + if (ret != 0) { + struct worker_ctx *worker = t->ctx->worker; + struct sockaddr *peer = session_get_peer(session); + session_waitinglist_finalize(session, KR_STATE_FAIL); + session_tasklist_finalize(session, KR_STATE_FAIL); + worker_del_tcp_connected(worker, peer); + session_close(session); + break; + } + session_waitinglist_pop(session, true); + } + return ret; +} + +static void on_connect(uv_connect_t *req, int status) +{ + struct worker_ctx *worker = the_worker; + kr_require(worker); + uv_stream_t *handle = req->handle; + struct session *session = handle->data; + struct sockaddr *peer = session_get_peer(session); + free(req); + + if (kr_fails_assert(session_flags(session)->outgoing)) + return; + + if (session_flags(session)->closing) { + worker_del_tcp_waiting(worker, peer); + kr_assert(session_is_empty(session)); + return; + } + + const bool log_debug = kr_log_is_debug(WORKER, NULL); + + /* Check if the connection is in the waiting list. + * If no, most likely this is timed out connection + * which was removed from waiting list by + * on_tcp_connect_timeout() callback. */ + struct session *s = worker_find_tcp_waiting(worker, peer); + if (!s || s != session) { + /* session isn't on the waiting list. + * it's timed out session. */ + if (log_debug) { + const char *peer_str = kr_straddr(peer); + kr_log_debug(WORKER, "=> connected to '%s', but session " + "is already timed out, close\n", + peer_str ? peer_str : ""); + } + kr_assert(session_tasklist_is_empty(session)); + session_waitinglist_retry(session, false); + session_close(session); + return; + } + + s = worker_find_tcp_connected(worker, peer); + if (s) { + /* session already in the connected list. + * Something went wrong, it can be due to races when kresd has tried + * to reconnect to upstream after unsuccessful attempt. */ + if (log_debug) { + const char *peer_str = kr_straddr(peer); + kr_log_debug(WORKER, "=> connected to '%s', but peer " + "is already connected, close\n", + peer_str ? peer_str : ""); + } + kr_assert(session_tasklist_is_empty(session)); + session_waitinglist_retry(session, false); + session_close(session); + return; + } + + if (status != 0) { + if (log_debug) { + const char *peer_str = kr_straddr(peer); + kr_log_debug(WORKER, "=> connection to '%s' failed (%s), flagged as 'bad'\n", + peer_str ? peer_str : "", uv_strerror(status)); + } + worker_del_tcp_waiting(worker, peer); + struct qr_task *task = session_waitinglist_get(session); + if (task && status != UV_ETIMEDOUT) { + /* Penalize upstream. + * In case of UV_ETIMEDOUT upstream has been + * already penalized in on_tcp_connect_timeout() */ + struct kr_query *qry = array_tail(task->ctx->req.rplan.pending); + qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_FAILED); + } + kr_assert(session_tasklist_is_empty(session)); + session_waitinglist_retry(session, false); + session_close(session); + return; + } + + if (!session_flags(session)->has_tls) { + /* if there is a TLS, session still waiting for handshake, + * otherwise remove it from waiting list */ + if (worker_del_tcp_waiting(worker, peer) != 0) { + /* session isn't in list of waiting queries, * + * something gone wrong */ + session_waitinglist_finalize(session, KR_STATE_FAIL); + kr_assert(session_tasklist_is_empty(session)); + session_close(session); + return; + } + } + + if (log_debug) { + const char *peer_str = kr_straddr(peer); + kr_log_debug(WORKER, "=> connected to '%s'\n", peer_str ? peer_str : ""); + } + + session_flags(session)->connected = true; + session_start_read(session); + + int ret = kr_ok(); + if (session_flags(session)->has_tls) { + struct tls_client_ctx *tls_ctx = session_tls_get_client_ctx(session); + ret = tls_client_connect_start(tls_ctx, session, session_tls_hs_cb); + if (ret == kr_error(EAGAIN)) { + session_timer_stop(session); + session_timer_start(session, tcp_timeout_trigger, + MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY); + return; + } + } else { + worker_add_tcp_connected(worker, peer, session); + } + + ret = send_waiting(session); + if (ret != 0) { + return; + } + + session_timer_stop(session); + session_timer_start(session, tcp_timeout_trigger, + MAX_TCP_INACTIVITY, MAX_TCP_INACTIVITY); +} + +static void on_tcp_connect_timeout(uv_timer_t *timer) +{ + struct session *session = timer->data; + + uv_timer_stop(timer); + struct worker_ctx *worker = the_worker; + kr_require(worker); + + kr_assert(session_tasklist_is_empty(session)); + + struct sockaddr *peer = session_get_peer(session); + worker_del_tcp_waiting(worker, peer); + + struct qr_task *task = session_waitinglist_get(session); + if (!task) { + /* Normally shouldn't happen. */ + const char *peer_str = kr_straddr(peer); + VERBOSE_MSG(NULL, "=> connection to '%s' failed (internal timeout), empty waitinglist\n", + peer_str ? peer_str : ""); + return; + } + + struct kr_query *qry = task_get_last_pending_query(task); + if (kr_log_is_debug_qry(WORKER, qry)) { + const char *peer_str = kr_straddr(peer); + VERBOSE_MSG(qry, "=> connection to '%s' failed (internal timeout)\n", + peer_str ? peer_str : ""); + } + + qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_TIMEOUT); + + worker->stats.timeout += session_waitinglist_get_len(session); + session_waitinglist_retry(session, true); + kr_assert(session_tasklist_is_empty(session)); + /* uv_cancel() doesn't support uv_connect_t request, + * so that we can't cancel it. + * There still exists possibility of successful connection + * for this request. + * So connection callback (on_connect()) must check + * if connection is in the list of waiting connection. + * If no, most likely this is timed out connection even if + * it was successful. */ +} + +/* This is called when I/O timeouts */ +static void on_udp_timeout(uv_timer_t *timer) +{ + struct session *session = timer->data; + kr_assert(session_get_handle(session)->data == session); + kr_assert(session_tasklist_get_len(session) == 1); + kr_assert(session_waitinglist_is_empty(session)); + + uv_timer_stop(timer); + + struct qr_task *task = session_tasklist_get_first(session); + if (!task) + return; + struct worker_ctx *worker = task->ctx->worker; + + if (task->leading && task->pending_count > 0) { + struct kr_query *qry = array_tail(task->ctx->req.rplan.pending); + qry->server_selection.error(qry, task->transport, KR_SELECTION_QUERY_TIMEOUT); + } + + task->timeouts += 1; + worker->stats.timeout += 1; + qr_task_step(task, NULL, NULL); +} + +static uv_handle_t *transmit(struct qr_task *task) +{ + uv_handle_t *ret = NULL; + + if (task) { + struct kr_transport* transport = task->transport; + + struct sockaddr_in6 *choice = (struct sockaddr_in6 *)&transport->address; + + if (!choice) { + return ret; + } + if (task->pending_count >= MAX_PENDING) { + return ret; + } + /* Checkout answer before sending it */ + struct request_ctx *ctx = task->ctx; + if (kr_resolve_checkout(&ctx->req, NULL, transport, task->pktbuf) != 0) { + return ret; + } + ret = ioreq_spawn(ctx->worker, SOCK_DGRAM, choice->sin6_family, false, false); + if (!ret) { + return ret; + } + struct sockaddr *addr = (struct sockaddr *)choice; + struct session *session = ret->data; + struct sockaddr *peer = session_get_peer(session); + kr_assert(peer->sa_family == AF_UNSPEC && session_flags(session)->outgoing); + kr_require(addr->sa_family == AF_INET || addr->sa_family == AF_INET6); + memcpy(peer, addr, kr_sockaddr_len(addr)); + if (qr_task_send(task, session, (struct sockaddr *)choice, + task->pktbuf) != 0) { + session_close(session); + ret = NULL; + } else { + task->pending[task->pending_count] = session; + task->pending_count += 1; + session_start_read(session); /* Start reading answer */ + } + } + return ret; +} + + +static void subreq_finalize(struct qr_task *task, const struct sockaddr *packet_source, knot_pkt_t *pkt) +{ + if (!task || task->finished) { + return; + } + /* Close pending timer */ + ioreq_kill_pending(task); + /* Clear from outgoing table. */ + if (!task->leading) + return; + char key[SUBREQ_KEY_LEN]; + const int klen = subreq_key(key, task->pktbuf); + if (klen > 0) { + void *val_deleted; + int ret = trie_del(task->ctx->worker->subreq_out, key, klen, &val_deleted); + kr_assert(ret == KNOT_EOK && val_deleted == task); + } + /* Notify waiting tasks. */ + struct kr_query *leader_qry = array_tail(task->ctx->req.rplan.pending); + for (size_t i = task->waiting.len; i > 0; i--) { + struct qr_task *follower = task->waiting.at[i - 1]; + /* Reuse MSGID and 0x20 secret */ + if (follower->ctx->req.rplan.pending.len > 0) { + struct kr_query *qry = array_tail(follower->ctx->req.rplan.pending); + qry->id = leader_qry->id; + qry->secret = leader_qry->secret; + + // Note that this transport may not be present in `leader_qry`'s server selection + follower->transport = task->transport; + if(follower->transport) { + follower->transport->deduplicated = true; + } + leader_qry->secret = 0; /* Next will be already decoded */ + } + qr_task_step(follower, packet_source, pkt); + qr_task_unref(follower); + } + task->waiting.len = 0; + task->leading = false; +} + +static void subreq_lead(struct qr_task *task) +{ + if (kr_fails_assert(task)) + return; + char key[SUBREQ_KEY_LEN]; + const int klen = subreq_key(key, task->pktbuf); + if (klen < 0) + return; + struct qr_task **tvp = (struct qr_task **) + trie_get_ins(task->ctx->worker->subreq_out, key, klen); + if (unlikely(!tvp)) + return; /*ENOMEM*/ + if (kr_fails_assert(*tvp == NULL)) + return; + *tvp = task; + task->leading = true; +} + +static bool subreq_enqueue(struct qr_task *task) +{ + if (kr_fails_assert(task)) + return false; + char key[SUBREQ_KEY_LEN]; + const int klen = subreq_key(key, task->pktbuf); + if (klen < 0) + return false; + struct qr_task **leader = (struct qr_task **) + trie_get_try(task->ctx->worker->subreq_out, key, klen); + if (!leader /*ENOMEM*/ || !*leader) + return false; + /* Enqueue itself to leader for this subrequest. */ + int ret = array_push_mm((*leader)->waiting, task, + kr_memreserve, &(*leader)->ctx->req.pool); + if (unlikely(ret < 0)) /*ENOMEM*/ + return false; + qr_task_ref(task); + return true; +} + +#if ENABLE_XDP +static void xdp_tx_waker(uv_idle_t *handle) +{ + int ret = knot_xdp_send_finish(handle->data); + if (ret != KNOT_EAGAIN && ret != KNOT_EOK) + kr_log_error(XDP, "check: ret = %d, %s\n", ret, knot_strerror(ret)); + /* Apparently some drivers need many explicit wake-up calls + * even if we push no additional packets (in case they accumulated a lot) */ + if (ret != KNOT_EAGAIN) + uv_idle_stop(handle); + knot_xdp_send_prepare(handle->data); + /* LATER(opt.): it _might_ be better for performance to do these two steps + * at different points in time */ +} +#endif +/** Send an answer packet over XDP. */ +static int xdp_push(struct qr_task *task, const uv_handle_t *src_handle) +{ +#if ENABLE_XDP + struct request_ctx *ctx = task->ctx; + xdp_handle_data_t *xhd = src_handle->data; + if (kr_fails_assert(xhd && xhd->socket && xhd->session == ctx->source.session)) + return qr_task_on_send(task, src_handle, kr_error(EINVAL)); + + knot_xdp_msg_t msg; +#if KNOT_VERSION_HEX >= 0x030100 + /* We don't have a nice way of preserving the _msg_t from frame allocation, + * so we manually redo all other parts of knot_xdp_send_alloc() */ + memset(&msg, 0, sizeof(msg)); + bool ipv6 = ctx->source.addr.ip.sa_family == AF_INET6; + msg.flags = ipv6 ? KNOT_XDP_MSG_IPV6 : 0; + memcpy(msg.eth_from, &ctx->source.eth_addrs[0], 6); + memcpy(msg.eth_to, &ctx->source.eth_addrs[1], 6); +#endif + const struct sockaddr *ip_from = &ctx->source.dst_addr.ip; + const struct sockaddr *ip_to = &ctx->source.comm_addr.ip; + memcpy(&msg.ip_from, ip_from, kr_sockaddr_len(ip_from)); + memcpy(&msg.ip_to, ip_to, kr_sockaddr_len(ip_to)); + msg.payload.iov_base = ctx->req.answer->wire; + msg.payload.iov_len = ctx->req.answer->size; + + uint32_t sent; + int ret = knot_xdp_send(xhd->socket, &msg, 1, &sent); + ctx->req.answer->wire = NULL; /* it's been freed */ + + uv_idle_start(&xhd->tx_waker, xdp_tx_waker); + kr_log_debug(XDP, "pushed a packet, ret = %d\n", ret); + + return qr_task_on_send(task, src_handle, ret); +#else + kr_assert(!EINVAL); + return kr_error(EINVAL); +#endif +} + +static int qr_task_finalize(struct qr_task *task, int state) +{ + kr_require(task && task->leading == false); + if (task->finished) { + return kr_ok(); + } + struct request_ctx *ctx = task->ctx; + struct session *source_session = ctx->source.session; + kr_resolve_finish(&ctx->req, state); + + task->finished = true; + if (source_session == NULL) { + (void) qr_task_on_send(task, NULL, kr_error(EIO)); + return state == KR_STATE_DONE ? kr_ok() : kr_error(EIO); + } + + /* meant to be dropped */ + if (unlikely(ctx->req.answer == NULL || ctx->req.options.NO_ANSWER)) { + /* For NO_ANSWER, a well-behaved layer should set the state to FAIL */ + kr_assert(!ctx->req.options.NO_ANSWER || (ctx->req.state & KR_STATE_FAIL)); + + (void) qr_task_on_send(task, NULL, kr_ok()); + return kr_ok(); + } + + if (session_flags(source_session)->closing || + ctx->source.addr.ip.sa_family == AF_UNSPEC) + return kr_error(EINVAL); + + /* Reference task as the callback handler can close it */ + qr_task_ref(task); + + /* Send back answer */ + int ret; + const uv_handle_t *src_handle = session_get_handle(source_session); + if (kr_fails_assert(src_handle->type == UV_UDP || src_handle->type == UV_TCP + || src_handle->type == UV_POLL)) { + ret = kr_error(EINVAL); + } else if (src_handle->type == UV_POLL) { + ret = xdp_push(task, src_handle); + } else if (src_handle->type == UV_UDP && ENABLE_SENDMMSG) { + int fd; + ret = uv_fileno(src_handle, &fd); + if (ret == 0) + udp_queue_push(fd, &ctx->req, task); + else + kr_assert(false); + } else { + ret = qr_task_send(task, source_session, &ctx->source.comm_addr.ip, ctx->req.answer); + } + + if (ret != kr_ok()) { + (void) qr_task_on_send(task, NULL, kr_error(EIO)); + /* Since source session is erroneous detach all tasks. */ + while (!session_tasklist_is_empty(source_session)) { + struct qr_task *t = session_tasklist_del_first(source_session, false); + struct request_ctx *c = t->ctx; + kr_assert(c->source.session == source_session); + c->source.session = NULL; + /* Don't finalize them as there can be other tasks + * waiting for answer to this particular task. + * (ie. task->leading is true) */ + worker_task_unref(t); + } + session_close(source_session); + } + + qr_task_unref(task); + + if (ret != kr_ok() || state != KR_STATE_DONE) + return kr_error(EIO); + return kr_ok(); +} + +static int udp_task_step(struct qr_task *task, + const struct sockaddr *packet_source, knot_pkt_t *packet) +{ + /* If there is already outgoing query, enqueue to it. */ + if (subreq_enqueue(task)) { + return kr_ok(); /* Will be notified when outgoing query finishes. */ + } + /* Start transmitting */ + uv_handle_t *handle = transmit(task); + if (handle == NULL) { + subreq_finalize(task, packet_source, packet); + return qr_task_finalize(task, KR_STATE_FAIL); + } + + /* Announce and start subrequest. + * @note Only UDP can lead I/O as it doesn't touch 'task->pktbuf' for reassembly. + */ + subreq_lead(task); + + return kr_ok(); +} + +static int tcp_task_waiting_connection(struct session *session, struct qr_task *task) +{ + if (kr_fails_assert(session_flags(session)->outgoing && !session_flags(session)->closing)) + return kr_error(EINVAL); + /* Add task to the end of list of waiting tasks. + * It will be notified in on_connect() or qr_task_on_send(). */ + int ret = session_waitinglist_push(session, task); + if (ret < 0) { + return kr_error(EINVAL); + } + return kr_ok(); +} + +static int tcp_task_existing_connection(struct session *session, struct qr_task *task) +{ + if (kr_fails_assert(session_flags(session)->outgoing && !session_flags(session)->closing)) + return kr_error(EINVAL); + struct request_ctx *ctx = task->ctx; + struct worker_ctx *worker = ctx->worker; + + /* If there are any unsent queries, send it first. */ + int ret = send_waiting(session); + if (ret != 0) { + return kr_error(EINVAL); + } + + /* No unsent queries at that point. */ + if (session_tasklist_get_len(session) >= worker->tcp_pipeline_max) { + /* Too many outstanding queries, answer with SERVFAIL, */ + return kr_error(EINVAL); + } + + /* Send query to upstream. */ + ret = qr_task_send(task, session, NULL, NULL); + if (ret != 0) { + /* Error, finalize task with SERVFAIL and + * close connection to upstream. */ + session_tasklist_finalize(session, KR_STATE_FAIL); + worker_del_tcp_connected(worker, session_get_peer(session)); + session_close(session); + return kr_error(EINVAL); + } + + return kr_ok(); +} + +static int tcp_task_make_connection(struct qr_task *task, const struct sockaddr *addr) +{ + struct request_ctx *ctx = task->ctx; + struct worker_ctx *worker = ctx->worker; + + /* Check if there must be TLS */ + struct tls_client_ctx *tls_ctx = NULL; + struct network *net = &worker->engine->net; + tls_client_param_t *entry = tls_client_param_get(net->tls_client_params, addr); + if (entry) { + /* Address is configured to be used with TLS. + * We need to allocate auxiliary data structure. */ + tls_ctx = tls_client_ctx_new(entry, worker); + if (!tls_ctx) { + return kr_error(EINVAL); + } + } + + uv_connect_t *conn = malloc(sizeof(uv_connect_t)); + if (!conn) { + tls_client_ctx_free(tls_ctx); + return kr_error(EINVAL); + } + bool has_http = false; + bool has_tls = (tls_ctx != NULL); + uv_handle_t *client = ioreq_spawn(worker, SOCK_STREAM, addr->sa_family, has_tls, has_http); + if (!client) { + tls_client_ctx_free(tls_ctx); + free(conn); + return kr_error(EINVAL); + } + struct session *session = client->data; + if (kr_fails_assert(session_flags(session)->has_tls == has_tls)) { + tls_client_ctx_free(tls_ctx); + free(conn); + return kr_error(EINVAL); + } + if (has_tls) { + tls_client_ctx_set_session(tls_ctx, session); + session_tls_set_client_ctx(session, tls_ctx); + } + + /* Add address to the waiting list. + * Now it "is waiting to be connected to." */ + int ret = worker_add_tcp_waiting(worker, addr, session); + if (ret < 0) { + free(conn); + session_close(session); + return kr_error(EINVAL); + } + + conn->data = session; + /* Store peer address for the session. */ + struct sockaddr *peer = session_get_peer(session); + memcpy(peer, addr, kr_sockaddr_len(addr)); + + /* Start watchdog to catch eventual connection timeout. */ + ret = session_timer_start(session, on_tcp_connect_timeout, + KR_CONN_RTT_MAX, 0); + if (ret != 0) { + worker_del_tcp_waiting(worker, addr); + free(conn); + session_close(session); + return kr_error(EINVAL); + } + + struct kr_query *qry = task_get_last_pending_query(task); + if (kr_log_is_debug_qry(WORKER, qry)) { + const char *peer_str = kr_straddr(peer); + VERBOSE_MSG(qry, "=> connecting to: '%s'\n", peer_str ? peer_str : ""); + } + + /* Start connection process to upstream. */ + ret = uv_tcp_connect(conn, (uv_tcp_t *)client, addr , on_connect); + if (ret != 0) { + session_timer_stop(session); + worker_del_tcp_waiting(worker, addr); + free(conn); + session_close(session); + qry->server_selection.error(qry, task->transport, KR_SELECTION_TCP_CONNECT_FAILED); + return kr_error(EAGAIN); + } + + /* Add task to the end of list of waiting tasks. + * Will be notified either in on_connect() or in qr_task_on_send(). */ + ret = session_waitinglist_push(session, task); + if (ret < 0) { + session_timer_stop(session); + worker_del_tcp_waiting(worker, addr); + free(conn); + session_close(session); + return kr_error(EINVAL); + } + + return kr_ok(); +} + +static int tcp_task_step(struct qr_task *task, + const struct sockaddr *packet_source, knot_pkt_t *packet) +{ + if (kr_fails_assert(task->pending_count == 0)) { + subreq_finalize(task, packet_source, packet); + return qr_task_finalize(task, KR_STATE_FAIL); + } + + /* target */ + const struct sockaddr *addr = &task->transport->address.ip; + if (addr->sa_family == AF_UNSPEC) { + /* Target isn't defined. Finalize task with SERVFAIL. + * Although task->pending_count is zero, there are can be followers, + * so we need to call subreq_finalize() to handle them properly. */ + subreq_finalize(task, packet_source, packet); + return qr_task_finalize(task, KR_STATE_FAIL); + } + /* Checkout task before connecting */ + struct request_ctx *ctx = task->ctx; + if (kr_resolve_checkout(&ctx->req, NULL, task->transport, task->pktbuf) != 0) { + subreq_finalize(task, packet_source, packet); + return qr_task_finalize(task, KR_STATE_FAIL); + } + int ret; + struct session* session = NULL; + if ((session = worker_find_tcp_waiting(ctx->worker, addr)) != NULL) { + /* Connection is in the list of waiting connections. + * It means that connection establishing is coming right now. */ + ret = tcp_task_waiting_connection(session, task); + } else if ((session = worker_find_tcp_connected(ctx->worker, addr)) != NULL) { + /* Connection has been already established. */ + ret = tcp_task_existing_connection(session, task); + } else { + /* Make connection. */ + ret = tcp_task_make_connection(task, addr); + } + + if (ret != kr_ok()) { + subreq_finalize(task, addr, packet); + if (ret == kr_error(EAGAIN)) { + ret = qr_task_step(task, addr, NULL); + } else { + ret = qr_task_finalize(task, KR_STATE_FAIL); + } + } + + return ret; +} + +static int qr_task_step(struct qr_task *task, + const struct sockaddr *packet_source, knot_pkt_t *packet) +{ + /* No more steps after we're finished. */ + if (!task || task->finished) { + return kr_error(ESTALE); + } + + /* Close pending I/O requests */ + subreq_finalize(task, packet_source, packet); + if ((kr_now() - worker_task_creation_time(task)) >= KR_RESOLVE_TIME_LIMIT) { + struct kr_request *req = worker_task_request(task); + if (!kr_fails_assert(req)) + kr_query_inform_timeout(req, req->current_query); + return qr_task_finalize(task, KR_STATE_FAIL); + } + + /* Consume input and produce next query */ + struct request_ctx *ctx = task->ctx; + if (kr_fails_assert(ctx)) + return qr_task_finalize(task, KR_STATE_FAIL); + struct kr_request *req = &ctx->req; + struct worker_ctx *worker = ctx->worker; + + if (worker->too_many_open) { + /* */ + struct kr_rplan *rplan = &req->rplan; + if (worker->stats.rconcurrent < + worker->rconcurrent_highwatermark - 10) { + worker->too_many_open = false; + } else { + if (packet && kr_rplan_empty(rplan)) { + /* new query; TODO - make this detection more obvious */ + kr_resolve_consume(req, &task->transport, packet); + } + return qr_task_finalize(task, KR_STATE_FAIL); + } + } + + // Report network RTT back to server selection + if (packet && task->send_time && task->recv_time) { + struct kr_query *qry = array_tail(req->rplan.pending); + qry->server_selection.update_rtt(qry, task->transport, task->recv_time - task->send_time); + } + + int state = kr_resolve_consume(req, &task->transport, packet); + + task->transport = NULL; + while (state == KR_STATE_PRODUCE) { + state = kr_resolve_produce(req, &task->transport, task->pktbuf); + if (unlikely(++task->iter_count > KR_ITER_LIMIT || + task->timeouts >= KR_TIMEOUT_LIMIT)) { + + struct kr_rplan *rplan = &req->rplan; + struct kr_query *last = kr_rplan_last(rplan); + if (task->iter_count > KR_ITER_LIMIT) { + char *msg = "cancelling query due to exceeded iteration count limit"; + VERBOSE_MSG(last, "%s of %d\n", msg, KR_ITER_LIMIT); + kr_request_set_extended_error(req, KNOT_EDNS_EDE_OTHER, + "OGHD: exceeded iteration count limit"); + } + if (task->timeouts >= KR_TIMEOUT_LIMIT) { + char *msg = "cancelling query due to exceeded timeout retries limit"; + VERBOSE_MSG(last, "%s of %d\n", msg, KR_TIMEOUT_LIMIT); + kr_request_set_extended_error(req, KNOT_EDNS_EDE_NREACH_AUTH, "QLPL"); + } + + return qr_task_finalize(task, KR_STATE_FAIL); + } + } + + /* We're done, no more iterations needed */ + if (state & (KR_STATE_DONE|KR_STATE_FAIL)) { + return qr_task_finalize(task, state); + } else if (!task->transport || !task->transport->protocol) { + return qr_task_step(task, NULL, NULL); + } + + switch (task->transport->protocol) + { + case KR_TRANSPORT_UDP: + return udp_task_step(task, packet_source, packet); + case KR_TRANSPORT_TCP: // fall through + case KR_TRANSPORT_TLS: + return tcp_task_step(task, packet_source, packet); + default: + kr_assert(!EINVAL); + return kr_error(EINVAL); + } +} + +int worker_submit(struct session *session, struct io_comm_data *comm, + const uint8_t *eth_from, const uint8_t *eth_to, knot_pkt_t *pkt) +{ + if (!session || !pkt) + return kr_error(EINVAL); + + uv_handle_t *handle = session_get_handle(session); + if (!handle || !handle->loop->data) + return kr_error(EINVAL); + + const bool is_query = pkt->size > KNOT_WIRE_OFFSET_FLAGS1 + && knot_wire_get_qr(pkt->wire) == 0; + const bool is_outgoing = session_flags(session)->outgoing; + + int ret = 0; + if (is_query == is_outgoing) + ret = KNOT_ENOENT; + + // For responses from upstream, try to find associated task and query. + // In case of errors, at least try to guess. + struct qr_task *task = NULL; + bool task_matched_id = false; + if (is_outgoing && pkt->size >= 2) { + const uint16_t id = knot_wire_get_id(pkt->wire); + task = session_tasklist_del_msgid(session, id); + task_matched_id = task != NULL; + if (task_matched_id) // Note receive time for RTT calculation + task->recv_time = kr_now(); + if (!task_matched_id) { + ret = KNOT_ENOENT; + VERBOSE_MSG(NULL, "=> DNS message with mismatching ID %d\n", + (int)id); + } + } + if (!task && is_outgoing && handle->type == UV_TCP) { + // Source address of the reply got somewhat validated, + // so we try to at least guess which query, for error reporting. + task = session_tasklist_get_first(session); + } + struct kr_query *qry = NULL; + if (task) + qry = array_tail(task->ctx->req.rplan.pending); + + // Parse the packet, unless it's useless anyway. + if (ret == 0) { + ret = knot_pkt_parse(pkt, 0); + if (ret == KNOT_ETRAIL && is_outgoing + && !kr_fails_assert(pkt->parsed < pkt->size)) { + // We deal with this later, so that RCODE takes priority. + ret = 0; + } + if (ret && kr_log_is_debug_qry(WORKER, qry)) { + VERBOSE_MSG(qry, "=> DNS message failed to parse, %s\n", + knot_strerror(ret)); + } + } + + struct http_ctx *http_ctx = NULL; +#if ENABLE_DOH2 + http_ctx = session_http_get_server_ctx(session); + + /* Badly formed query when using DoH leads to a Bad Request */ + if (http_ctx && !is_outgoing && ret) { + http_send_status(session, HTTP_STATUS_BAD_REQUEST); + return kr_error(ret); + } +#endif + + if (!is_outgoing && http_ctx && queue_len(http_ctx->streams) <= 0) + return kr_error(ENOENT); + + const struct sockaddr *addr = comm ? comm->src_addr : NULL; + + /* Ignore badly formed queries. */ + if (ret) { + if (is_outgoing && qry) // unusuable response from somewhat validated IP + qry->server_selection.error(qry, task->transport, KR_SELECTION_MALFORMED); + if (!is_outgoing) + the_worker->stats.dropped += 1; + if (task_matched_id) // notify task that answer won't be coming anymore + qr_task_step(task, addr, NULL); + return kr_error(EILSEQ); + } + + /* Start new task on listening sockets, + * or resume if this is subrequest */ + if (!is_outgoing) { /* request from a client */ + struct request_ctx *ctx = + request_create(the_worker, session, comm, eth_from, + eth_to, knot_wire_get_id(pkt->wire)); + if (http_ctx) + queue_pop(http_ctx->streams); + if (!ctx) + return kr_error(ENOMEM); + + ret = request_start(ctx, pkt); + if (ret != 0) { + request_free(ctx); + return kr_error(ENOMEM); + } + + task = qr_task_create(ctx); + if (!task) { + request_free(ctx); + return kr_error(ENOMEM); + } + + if (handle->type == UV_TCP && qr_task_register(task, session)) { + return kr_error(ENOMEM); + } + } else { /* response from upstream */ + if (task == NULL) { + return kr_error(ENOENT); + } + if (kr_fails_assert(!session_flags(session)->closing)) + return kr_error(EINVAL); + } + if (kr_fails_assert(!uv_is_closing(session_get_handle(session)))) + return kr_error(EINVAL); + + /* Packet was successfully parsed. + * Task was created (found). */ + session_touch(session); + + /* Consume input and produce next message */ + return qr_task_step(task, addr, pkt); +} + +static int trie_add_tcp_session(trie_t *trie, const struct sockaddr *addr, + struct session *session) +{ + if (kr_fails_assert(trie && addr)) + return kr_error(EINVAL); + struct kr_sockaddr_key_storage key; + ssize_t keylen = kr_sockaddr_key(&key, addr); + if (keylen < 0) + return keylen; + trie_val_t *val = trie_get_ins(trie, key.bytes, keylen); + if (kr_fails_assert(*val == NULL)) + return kr_error(EINVAL); + *val = session; + return kr_ok(); +} + +static int trie_del_tcp_session(trie_t *trie, const struct sockaddr *addr) +{ + if (kr_fails_assert(trie && addr)) + return kr_error(EINVAL); + struct kr_sockaddr_key_storage key; + ssize_t keylen = kr_sockaddr_key(&key, addr); + if (keylen < 0) + return keylen; + int ret = trie_del(trie, key.bytes, keylen, NULL); + return ret ? kr_error(ENOENT) : kr_ok(); +} + +static struct session *trie_find_tcp_session(trie_t *trie, + const struct sockaddr *addr) +{ + if (kr_fails_assert(trie && addr)) + return NULL; + struct kr_sockaddr_key_storage key; + ssize_t keylen = kr_sockaddr_key(&key, addr); + if (keylen < 0) + return NULL; + trie_val_t *val = trie_get_try(trie, key.bytes, keylen); + return val ? *val : NULL; +} + +int worker_add_tcp_connected(struct worker_ctx *worker, + const struct sockaddr* addr, + struct session *session) +{ + return trie_add_tcp_session(worker->tcp_connected, addr, session); +} + +int worker_del_tcp_connected(struct worker_ctx *worker, + const struct sockaddr* addr) +{ + return trie_del_tcp_session(worker->tcp_connected, addr); +} + +struct session* worker_find_tcp_connected(struct worker_ctx *worker, + const struct sockaddr* addr) +{ + return trie_find_tcp_session(worker->tcp_connected, addr); +} + +static int worker_add_tcp_waiting(struct worker_ctx *worker, + const struct sockaddr* addr, + struct session *session) +{ + return trie_add_tcp_session(worker->tcp_waiting, addr, session); +} + +int worker_del_tcp_waiting(struct worker_ctx *worker, + const struct sockaddr* addr) +{ + return trie_del_tcp_session(worker->tcp_waiting, addr); +} + +struct session* worker_find_tcp_waiting(struct worker_ctx *worker, + const struct sockaddr* addr) +{ + return trie_find_tcp_session(worker->tcp_waiting, addr); +} + +int worker_end_tcp(struct session *session) +{ + if (!session) + return kr_error(EINVAL); + + session_timer_stop(session); + + struct sockaddr *peer = session_get_peer(session); + + worker_del_tcp_waiting(the_worker, peer); + worker_del_tcp_connected(the_worker, peer); + session_flags(session)->connected = false; + + struct tls_client_ctx *tls_client_ctx = session_tls_get_client_ctx(session); + if (tls_client_ctx) { + /* Avoid gnutls_bye() call */ + tls_set_hs_state(&tls_client_ctx->c, TLS_HS_NOT_STARTED); + } + + struct tls_ctx *tls_ctx = session_tls_get_server_ctx(session); + if (tls_ctx) { + /* Avoid gnutls_bye() call */ + tls_set_hs_state(&tls_ctx->c, TLS_HS_NOT_STARTED); + } + + while (!session_waitinglist_is_empty(session)) { + struct qr_task *task = session_waitinglist_pop(session, false); + kr_assert(task->refs > 1); + session_tasklist_del(session, task); + if (session_flags(session)->outgoing) { + if (task->ctx->req.options.FORWARD) { + /* We are in TCP_FORWARD mode. + * To prevent failing at kr_resolve_consume() + * qry.flags.TCP must be cleared. + * TODO - refactoring is needed. */ + struct kr_request *req = &task->ctx->req; + struct kr_rplan *rplan = &req->rplan; + struct kr_query *qry = array_tail(rplan->pending); + qry->flags.TCP = false; + } + qr_task_step(task, NULL, NULL); + } else { + kr_assert(task->ctx->source.session == session); + task->ctx->source.session = NULL; + } + worker_task_unref(task); + } + while (!session_tasklist_is_empty(session)) { + struct qr_task *task = session_tasklist_del_first(session, false); + if (session_flags(session)->outgoing) { + if (task->ctx->req.options.FORWARD) { + struct kr_request *req = &task->ctx->req; + struct kr_rplan *rplan = &req->rplan; + struct kr_query *qry = array_tail(rplan->pending); + qry->flags.TCP = false; + } + qr_task_step(task, NULL, NULL); + } else { + kr_assert(task->ctx->source.session == session); + task->ctx->source.session = NULL; + } + worker_task_unref(task); + } + session_close(session); + return kr_ok(); +} + +knot_pkt_t *worker_resolve_mk_pkt_dname(knot_dname_t *qname, uint16_t qtype, uint16_t qclass, + const struct kr_qflags *options) +{ + knot_pkt_t *pkt = knot_pkt_new(NULL, KNOT_EDNS_MAX_UDP_PAYLOAD, NULL); + if (!pkt) + return NULL; + knot_pkt_put_question(pkt, qname, qclass, qtype); + knot_wire_set_rd(pkt->wire); + knot_wire_set_ad(pkt->wire); + + /* Add OPT RR, including wire format so modules can see both representations. + * knot_pkt_put() copies the outside; we need to duplicate the inside manually. */ + knot_rrset_t *opt = knot_rrset_copy(the_worker->engine->resolver.downstream_opt_rr, NULL); + if (!opt) { + knot_pkt_free(pkt); + return NULL; + } + if (options->DNSSEC_WANT) { + knot_edns_set_do(opt); + } + knot_pkt_begin(pkt, KNOT_ADDITIONAL); + int ret = knot_pkt_put(pkt, KNOT_COMPR_HINT_NONE, opt, KNOT_PF_FREE); + if (ret == KNOT_EOK) { + free(opt); /* inside is owned by pkt now */ + } else { + knot_rrset_free(opt, NULL); + knot_pkt_free(pkt); + return NULL; + } + + if (options->DNSSEC_CD) { + knot_wire_set_cd(pkt->wire); + } + + return pkt; +} + +knot_pkt_t *worker_resolve_mk_pkt(const char *qname_str, uint16_t qtype, uint16_t qclass, + const struct kr_qflags *options) +{ + uint8_t qname[KNOT_DNAME_MAXLEN]; + if (!knot_dname_from_str(qname, qname_str, sizeof(qname))) + return NULL; + return worker_resolve_mk_pkt_dname(qname, qtype, qclass, options); +} + +struct qr_task *worker_resolve_start(knot_pkt_t *query, struct kr_qflags options) +{ + struct worker_ctx *worker = the_worker; + if (kr_fails_assert(worker && query)) + return NULL; + + + struct request_ctx *ctx = request_create(worker, NULL, NULL, NULL, NULL, + worker->next_request_uid); + if (!ctx) + return NULL; + + /* Create task */ + struct qr_task *task = qr_task_create(ctx); + if (!task) { + request_free(ctx); + return NULL; + } + + /* Start task */ + int ret = request_start(ctx, query); + if (ret != 0) { + /* task is attached to request context, + * so dereference (and deallocate) it first */ + ctx->task = NULL; + qr_task_unref(task); + request_free(ctx); + return NULL; + } + + worker->next_request_uid += 1; + if (worker->next_request_uid == 0) + worker->next_request_uid = UINT16_MAX + 1; + + /* Set options late, as qr_task_start() -> kr_resolve_begin() rewrite it. */ + kr_qflags_set(&task->ctx->req.options, options); + return task; +} + +int worker_resolve_exec(struct qr_task *task, knot_pkt_t *query) +{ + if (!task) + return kr_error(EINVAL); + return qr_task_step(task, NULL, query); +} + +int worker_task_numrefs(const struct qr_task *task) +{ + return task->refs; +} + +struct kr_request *worker_task_request(struct qr_task *task) +{ + if (!task || !task->ctx) + return NULL; + + return &task->ctx->req; +} + +int worker_task_finalize(struct qr_task *task, int state) +{ + return qr_task_finalize(task, state); +} + + int worker_task_step(struct qr_task *task, const struct sockaddr *packet_source, + knot_pkt_t *packet) + { + return qr_task_step(task, packet_source, packet); + } + +void worker_task_complete(struct qr_task *task) +{ + qr_task_complete(task); +} + +void worker_task_ref(struct qr_task *task) +{ + qr_task_ref(task); +} + +void worker_task_unref(struct qr_task *task) +{ + qr_task_unref(task); +} + +void worker_task_timeout_inc(struct qr_task *task) +{ + task->timeouts += 1; +} + +knot_pkt_t *worker_task_get_pktbuf(const struct qr_task *task) +{ + return task->pktbuf; +} + +struct request_ctx *worker_task_get_request(struct qr_task *task) +{ + return task->ctx; +} + +struct kr_transport *worker_task_get_transport(struct qr_task *task) +{ + return task->transport; +} + +struct session *worker_request_get_source_session(const struct kr_request *req) +{ + static_assert(offsetof(struct request_ctx, req) == 0, + "Bad struct request_ctx definition."); + return ((struct request_ctx *)req)->source.session; +} + +uint16_t worker_task_pkt_get_msgid(struct qr_task *task) +{ + knot_pkt_t *pktbuf = worker_task_get_pktbuf(task); + uint16_t msg_id = knot_wire_get_id(pktbuf->wire); + return msg_id; +} + +void worker_task_pkt_set_msgid(struct qr_task *task, uint16_t msgid) +{ + knot_pkt_t *pktbuf = worker_task_get_pktbuf(task); + knot_wire_set_id(pktbuf->wire, msgid); + struct kr_query *q = task_get_last_pending_query(task); + q->id = msgid; +} + +uint64_t worker_task_creation_time(struct qr_task *task) +{ + return task->creation_time; +} + +void worker_task_subreq_finalize(struct qr_task *task) +{ + subreq_finalize(task, NULL, NULL); +} + +bool worker_task_finished(struct qr_task *task) +{ + return task->finished; +} + +/** Reserve worker buffers. We assume worker's been zeroed. */ +static int worker_reserve(struct worker_ctx *worker) +{ + worker->tcp_connected = trie_create(NULL); + worker->tcp_waiting = trie_create(NULL); + worker->subreq_out = trie_create(NULL); + + mm_ctx_mempool(&worker->pkt_pool, 4 * sizeof(knot_pkt_t)); + + return kr_ok(); +} + +void worker_deinit(void) +{ + struct worker_ctx *worker = the_worker; + if (kr_fails_assert(worker)) + return; + trie_free(worker->tcp_connected); + trie_free(worker->tcp_waiting); + trie_free(worker->subreq_out); + worker->subreq_out = NULL; + + for (int i = 0; i < worker->doh_qry_headers.len; i++) + free((void *)worker->doh_qry_headers.at[i]); + array_clear(worker->doh_qry_headers); + + mp_delete(worker->pkt_pool.ctx); + worker->pkt_pool.ctx = NULL; + + the_worker = NULL; +} + +int worker_init(struct engine *engine, int worker_count) +{ + if (kr_fails_assert(engine && engine->L && the_worker == NULL)) + return kr_error(EINVAL); + kr_bindings_register(engine->L); + + /* Create main worker. */ + struct worker_ctx *worker = &the_worker_value; + memset(worker, 0, sizeof(*worker)); + worker->engine = engine; + + uv_loop_t *loop = uv_default_loop(); + worker->loop = loop; + + worker->count = worker_count; + + /* Register table for worker per-request variables */ + lua_newtable(engine->L); + lua_setfield(engine->L, -2, "vars"); + lua_getfield(engine->L, -1, "vars"); + worker->vars_table_ref = luaL_ref(engine->L, LUA_REGISTRYINDEX); + lua_pop(engine->L, 1); + + worker->tcp_pipeline_max = MAX_PIPELINED; + worker->out_addr4.sin_family = AF_UNSPEC; + worker->out_addr6.sin6_family = AF_UNSPEC; + + array_init(worker->doh_qry_headers); + + int ret = worker_reserve(worker); + if (ret) return ret; + worker->next_request_uid = UINT16_MAX + 1; + + /* Set some worker.* fields in Lua */ + lua_getglobal(engine->L, "worker"); + pid_t pid = getpid(); + + auto_free char *pid_str = NULL; + const char *inst_name = getenv("SYSTEMD_INSTANCE"); + if (inst_name) { + lua_pushstring(engine->L, inst_name); + } else { + ret = asprintf(&pid_str, "%ld", (long)pid); + kr_assert(ret > 0); + lua_pushstring(engine->L, pid_str); + } + lua_setfield(engine->L, -2, "id"); + + lua_pushnumber(engine->L, pid); + lua_setfield(engine->L, -2, "pid"); + lua_pushnumber(engine->L, worker_count); + lua_setfield(engine->L, -2, "count"); + + char cwd[PATH_MAX]; + get_workdir(cwd, sizeof(cwd)); + lua_pushstring(engine->L, cwd); + lua_setfield(engine->L, -2, "cwd"); + + the_worker = worker; + loop->data = the_worker; + /* ^^^^ Now this shouldn't be used anymore, but it's hard to be 100% sure. */ + return kr_ok(); +} + +#undef VERBOSE_MSG |