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479 lines
15 KiB
C
479 lines
15 KiB
C
/*
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* SSLsplit - transparent SSL/TLS interception
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* Copyright (c) 2009-2016, Daniel Roethlisberger <daniel@roe.ch>
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* All rights reserved.
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* http://www.roe.ch/SSLsplit
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "pxythrmgr.h"
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#include "sys.h"
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#include "log.h"
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#include "pxyconn.h"
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#include <string.h>
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#include <event2/bufferevent.h>
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#include <pthread.h>
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#include <assert.h>
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/*
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* Proxy thread manager: manages the connection handling worker threads
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* and the per-thread resources (i.e. event bases). The load is shared
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* across num_cpu * 2 connection handling threads, using the number of
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* currently assigned connections as the sole metric.
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*
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* The attach and detach functions are thread-safe.
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*/
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#define THR_TIMER_TIMEOUT 10
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#define THR_TIMER_PRINT_INFO_TIMEOUT 1*THR_TIMER_TIMEOUT
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#define CONN_EXPIRE_TIME 30
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/*
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* Dummy recurring timer event to prevent the event loops from exiting when
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* they run out of events.
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*/
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static void
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pxy_thrmgr_timer_cb(UNUSED evutil_socket_t fd, UNUSED short what,
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UNUSED void *arg)
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{
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/* do nothing */
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pxy_thr_ctx_t *ctx = arg;
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! pxy_thrmgr_timer_cb <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< THREAD TIMER thr=%d, load=%u, to=%d\n", ctx->thridx, ctx->load, ctx->timeout_count);
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proxy_conn_meta_ctx_t *expired = NULL;
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pxy_thrmgr_get_thr_expired_conns(ctx, &expired);
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if (expired) {
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time_t now = time(NULL);
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while (expired) {
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proxy_conn_meta_ctx_t *next = expired->next_expired;
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log_dbg_level_printf(LOG_DBG_MODE_FINE, ">>>>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! pxy_thrmgr_timer_cb: DELETE thr=%d, fd=%d, fd2=%d, time=%lld <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< TIMED OUT\n",
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expired->thridx, expired->fd, expired->child_fd, (long int) now - expired->access_time);
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pxy_all_conn_free(expired);
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expired = next;
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}
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}
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ctx->timeout_count++;
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if (ctx->timeout_count * THR_TIMER_TIMEOUT > THR_TIMER_PRINT_INFO_TIMEOUT) {
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ctx->timeout_count = 0;
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pxy_thrmgr_print_thr_info(ctx);
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}
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}
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/*
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* Thread entry point; runs the event loop of the event base.
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* Does not exit until the libevent loop is broken explicitly.
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*/
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static void *
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pxy_thrmgr_thr(void *arg)
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{
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pxy_thr_ctx_t *ctx = arg;
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struct timeval timer_delay = {THR_TIMER_TIMEOUT, 0};
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struct event *ev;
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ev = event_new(ctx->evbase, -1, EV_PERSIST, pxy_thrmgr_timer_cb, ctx);
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if (!ev)
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return NULL;
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evtimer_add(ev, &timer_delay);
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ctx->running = 1;
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event_base_dispatch(ctx->evbase);
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event_free(ev);
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return NULL;
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}
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/*
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* Create new thread manager but do not start any threads yet.
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* This gets called before forking to background.
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*/
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pxy_thrmgr_ctx_t *
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pxy_thrmgr_new(opts_t *opts)
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{
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pxy_thrmgr_ctx_t *ctx;
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if (!(ctx = malloc(sizeof(pxy_thrmgr_ctx_t))))
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return NULL;
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memset(ctx, 0, sizeof(pxy_thrmgr_ctx_t));
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ctx->opts = opts;
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ctx->num_thr = 2 * sys_get_cpu_cores();
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return ctx;
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}
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/*
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* Start the thread manager and associated threads.
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* This must be called after forking.
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*
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* Returns -1 on failure, 0 on success.
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*/
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int
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pxy_thrmgr_run(pxy_thrmgr_ctx_t *ctx)
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{
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int idx = -1, dns = 0;
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dns = opts_has_dns_spec(ctx->opts);
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pthread_mutex_init(&ctx->mutex, NULL);
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if (!(ctx->thr = malloc(ctx->num_thr * sizeof(pxy_thr_ctx_t*)))) {
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log_dbg_printf("Failed to allocate memory\n");
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goto leave;
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}
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memset(ctx->thr, 0, ctx->num_thr * sizeof(pxy_thr_ctx_t*));
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for (idx = 0; idx < ctx->num_thr; idx++) {
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if (!(ctx->thr[idx] = malloc(sizeof(pxy_thr_ctx_t)))) {
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log_dbg_printf("Failed to allocate memory\n");
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goto leave;
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}
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memset(ctx->thr[idx], 0, sizeof(pxy_thr_ctx_t));
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ctx->thr[idx]->evbase = event_base_new();
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if (!ctx->thr[idx]->evbase) {
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log_dbg_printf("Failed to create evbase %d\n", idx);
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goto leave;
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}
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if (dns) {
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/* only create dns base if we actually need it later */
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ctx->thr[idx]->dnsbase = evdns_base_new(
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ctx->thr[idx]->evbase, 1);
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if (!ctx->thr[idx]->dnsbase) {
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log_dbg_printf("Failed to create dnsbase %d\n",
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idx);
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goto leave;
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}
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}
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ctx->thr[idx]->load = 0;
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ctx->thr[idx]->running = 0;
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ctx->thr[idx]->mctx_list = NULL;
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ctx->thr[idx]->thridx = idx;
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ctx->thr[idx]->timeout_count = 0;
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}
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log_dbg_printf("Initialized %d connection handling threads\n",
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ctx->num_thr);
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for (idx = 0; idx < ctx->num_thr; idx++) {
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if (pthread_create(&ctx->thr[idx]->thr, NULL,
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pxy_thrmgr_thr, ctx->thr[idx]))
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goto leave_thr;
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while (!ctx->thr[idx]->running) {
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sched_yield();
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}
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}
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log_dbg_printf("Started %d connection handling threads\n",
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ctx->num_thr);
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return 0;
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leave_thr:
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idx--;
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while (idx >= 0) {
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pthread_cancel(ctx->thr[idx]->thr);
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pthread_join(ctx->thr[idx]->thr, NULL);
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idx--;
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}
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idx = ctx->num_thr - 1;
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leave:
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while (idx >= 0) {
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if (ctx->thr[idx]) {
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if (ctx->thr[idx]->dnsbase) {
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evdns_base_free(ctx->thr[idx]->dnsbase, 0);
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}
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if (ctx->thr[idx]->evbase) {
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event_base_free(ctx->thr[idx]->evbase);
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}
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free(ctx->thr[idx]);
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}
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idx--;
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}
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pthread_mutex_destroy(&ctx->mutex);
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if (ctx->thr) {
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free(ctx->thr);
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ctx->thr = NULL;
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}
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return -1;
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}
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/*
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* Destroy the event manager and stop all threads.
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*/
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void
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pxy_thrmgr_free(pxy_thrmgr_ctx_t *ctx)
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{
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pthread_mutex_destroy(&ctx->mutex);
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if (ctx->thr) {
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for (int idx = 0; idx < ctx->num_thr; idx++) {
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event_base_loopbreak(ctx->thr[idx]->evbase);
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sched_yield();
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}
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for (int idx = 0; idx < ctx->num_thr; idx++) {
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pthread_join(ctx->thr[idx]->thr, NULL);
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}
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for (int idx = 0; idx < ctx->num_thr; idx++) {
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if (ctx->thr[idx]->dnsbase) {
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evdns_base_free(ctx->thr[idx]->dnsbase, 0);
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}
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if (ctx->thr[idx]->evbase) {
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event_base_free(ctx->thr[idx]->evbase);
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}
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free(ctx->thr[idx]);
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}
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free(ctx->thr);
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}
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free(ctx);
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}
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static void
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pxy_thrmgr_remove_mctx(proxy_conn_meta_ctx_t *node, proxy_conn_meta_ctx_t **head)
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{
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assert(node != NULL);
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assert(*head != NULL);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> pxy_thrmgr_remove_node: DELETING, fd=%d, fd2=%d\n", node->fd, node->child_fd);
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// @attention We may get multiple conns with the same fd combinations, so they cannot uniquely define a conn; hence the need for uuids.
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if (uuid_compare(node->uuid, (*head)->uuid, NULL) == 0) {
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*head = (*head)->next;
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return;
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}
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proxy_conn_meta_ctx_t *current = (*head)->next;
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proxy_conn_meta_ctx_t *previous = *head;
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while (current != NULL && previous != NULL) {
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if (uuid_compare(node->uuid, current->uuid, NULL) == 0) {
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previous->next = current->next;
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return;
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}
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previous = current;
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current = current->next;
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}
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return;
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}
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/*
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* Attach a new connection to a thread. Chooses the thread with the fewest
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* currently active connections, returns the appropriate event bases.
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* Returns the index of the chosen thread (for passing to _detach later).
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* This function cannot fail.
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*/
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int
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pxy_thrmgr_attach(pxy_thrmgr_ctx_t *ctx, struct event_base **evbase,
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struct evdns_base **dnsbase, proxy_conn_meta_ctx_t *mctx)
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{
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> ENTER pxy_thrmgr_attach()\n");
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int thridx;
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size_t minload;
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thridx = 0;
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pthread_mutex_lock(&ctx->mutex);
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minload = ctx->thr[thridx]->load;
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#ifdef DEBUG_THREAD
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log_dbg_printf("===> Proxy connection handler thread status:\n"
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"thr[%d]: %zu\n", thridx, minload);
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#endif /* DEBUG_THREAD */
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for (int idx = 1; idx < ctx->num_thr; idx++) {
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#ifdef DEBUG_THREAD
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log_dbg_printf("thr[%d]: %zu\n", idx, ctx->thr[idx]->load);
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#endif /* DEBUG_THREAD */
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if (minload > ctx->thr[idx]->load) {
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minload = ctx->thr[idx]->load;
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thridx = idx;
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}
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}
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*evbase = ctx->thr[thridx]->evbase;
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*dnsbase = ctx->thr[thridx]->dnsbase;
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ctx->thr[thridx]->load++;
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mctx->thridx = thridx;
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mctx->thr = ctx->thr[thridx];
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mctx->next = ctx->thr[thridx]->mctx_list;
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ctx->thr[thridx]->mctx_list = mctx;
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// @attention We are running on the thrmgr thread, do not call conn thread functions here.
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//pxy_thrmgr_print_thr_info(mctx->thr);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> EXIT pxy_thrmgr_attach()\n");
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pthread_mutex_unlock(&ctx->mutex);
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#ifdef DEBUG_THREAD
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log_dbg_printf("thridx: %d\n", thridx);
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#endif /* DEBUG_THREAD */
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return thridx;
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}
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void
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pxy_thrmgr_attach_child(pxy_thrmgr_ctx_t *ctx, int thridx)
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{
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> ENTER pxy_thrmgr_attach_e2()\n");
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pthread_mutex_lock(&ctx->mutex);
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ctx->thr[thridx]->load++;
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pthread_mutex_unlock(&ctx->mutex);
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}
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/*
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* Detach a connection from a thread by index.
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* This function cannot fail.
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*/
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void
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pxy_thrmgr_detach(pxy_thrmgr_ctx_t *ctx, int thridx, proxy_conn_meta_ctx_t *mctx)
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{
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> pxy_thrmgr_detach()\n");
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pthread_mutex_lock(&ctx->mutex);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> pxy_thrmgr_detach(): BEFORE pxy_thrmgr_remove_node\n");
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pxy_thrmgr_print_thr_info(mctx->thr);
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mctx->thr->load--;
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if (!mctx->child_list) {
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pxy_thrmgr_remove_mctx(mctx, &mctx->thr->mctx_list);
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} else {
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log_dbg_level_printf(LOG_DBG_MODE_FINER, ">>>>> pxy_thrmgr_detach(): parent ctx has an active child, will not remove from the list, fd=%d, fd2=%d <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
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mctx->fd, mctx->child_fd);
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}
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log_dbg_level_printf(LOG_DBG_MODE_FINER, ">>>>> pxy_thrmgr_detach(): AFTER pxy_thrmgr_remove_node\n");
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pxy_thrmgr_print_thr_info(mctx->thr);
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pthread_mutex_unlock(&ctx->mutex);
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}
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void
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pxy_thrmgr_detach_child(pxy_thrmgr_ctx_t *ctx, int thridx, proxy_conn_meta_ctx_t *mctx)
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{
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> pxy_thrmgr_detach_child()\n");
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pthread_mutex_lock(&ctx->mutex);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>> pxy_thrmgr_detach_child(): BEFORE pxy_thrmgr_remove_node\n");
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pxy_thrmgr_print_thr_info(mctx->thr);
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mctx->thr->load--;
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if (!mctx->parent_ctx && !mctx->child_list) {
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pxy_thrmgr_remove_mctx(mctx, &mctx->thr->mctx_list);
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} else {
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if (mctx->parent_ctx) {
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log_dbg_level_printf(LOG_DBG_MODE_FINER, ">>>>> pxy_thrmgr_detach_child(): child ctx has an active parent, will not remove from the list, fd=%d, fd2=%d <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
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mctx->fd, mctx->child_fd);
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} else if (mctx->child_list) {
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log_dbg_level_printf(LOG_DBG_MODE_FINER, ">>>>> pxy_thrmgr_detach_child(): conn has 1+ active child, will not remove from the list, fd=%d, fd2=%d <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
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mctx->fd, mctx->child_fd);
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}
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}
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log_dbg_level_printf(LOG_DBG_MODE_FINER, ">>>>> pxy_thrmgr_detach_child(): AFTER pxy_thrmgr_remove_node\n");
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pxy_thrmgr_print_thr_info(mctx->thr);
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pthread_mutex_unlock(&ctx->mutex);
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}
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void
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pxy_thrmgr_print_child_info(pxy_conn_child_info_t *info, int thridx, int count)
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{
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assert(info != NULL);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> .......... pxy_thrmgr_print_child_info(): thr=%d, cont=%d, e2dst=%d, dst2=%d, c=%d-%d, ci=%d\n",
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thridx, count, info->e2dst_fd, info->dst2_fd, info->e2dst_eof, info->dst2_eof, info->child_idx);
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if (info->next) {
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pxy_thrmgr_print_child_info(info->next, thridx, count);
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}
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}
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void
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pxy_thrmgr_print_thr_info(pxy_thr_ctx_t *ctx)
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{
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>>>>---------------------- pxy_thrmgr_print_thr_info(): ENTER\n");
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_print_thr_info(): thr=%d, load=%lu\n", ctx->thridx, ctx->load);
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if (ctx->mctx_list) {
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time_t now = time(NULL);
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proxy_conn_meta_ctx_t *mctx = ctx->mctx_list;
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int count = 0;
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while (mctx) {
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char *host, *port;
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if (mctx->addrlen == 0 || (sys_sockaddr_str((struct sockaddr *)&mctx->addr, mctx->addrlen, &host, &port) != 0)) {
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_print_thr_info(): Cannot get host:port: thr=%d, cont=%d, fd=%d, fd2=%d\n", ctx->thridx, count, mctx->fd, mctx->child_fd);
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_print_thr_info(): thr=%d, cont=%d, fd=%d, fd2=%d, src=%d, e2src=%d, dst=%d, e2dst=%d, dst2=%d, p=%d-%d-%d c=%d-%d, pe=%d ce=%d tcc=%d, time=%lld\n",
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ctx->thridx, count, mctx->fd, mctx->child_fd, mctx->src_fd, mctx->e2src_fd, mctx->dst_fd, mctx->e2dst_fd, mctx->dst2_fd,
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|
mctx->src_eof, mctx->e2src_eof, mctx->dst_eof, mctx->e2dst_eof, mctx->dst2_eof, mctx->parent_ctx ? 1:0, mctx->child_list ? 1:0, mctx->child_count,(long int) now - mctx->access_time);
|
|
} else {
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_print_thr_info(): thr=%d, cont=%d, fd=%d, fd2=%d, src=%d, e2src=%d, dst=%d, e2dst=%d, dst2=%d, p=%d-%d-%d c=%d-%d, pe=%d ce=%d tcc=%d, time=%lld, addr=%s:%s\n",
|
|
ctx->thridx, count, mctx->fd, mctx->child_fd, mctx->src_fd, mctx->e2src_fd, mctx->dst_fd, mctx->e2dst_fd, mctx->dst2_fd,
|
|
mctx->src_eof, mctx->e2src_eof, mctx->dst_eof, mctx->e2dst_eof, mctx->dst2_eof, mctx->parent_ctx ? 1:0, mctx->child_list ? 1:0, mctx->child_count, (long int) now - mctx->access_time, host ? host : "?", port ? port : "?");
|
|
free(host);
|
|
free(port);
|
|
}
|
|
|
|
if (mctx->child_info_list) {
|
|
pxy_thrmgr_print_child_info(mctx->child_info_list, ctx->thridx, count);
|
|
}
|
|
|
|
count++;
|
|
mctx = mctx->next;
|
|
}
|
|
}
|
|
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, ">>> pxy_thrmgr_print_thr_info(): EXIT\n");
|
|
}
|
|
|
|
void
|
|
pxy_thrmgr_get_thr_expired_conns(pxy_thr_ctx_t *ctx, proxy_conn_meta_ctx_t **expired_conns)
|
|
{
|
|
*expired_conns = NULL;
|
|
|
|
time_t now = time(NULL);
|
|
|
|
proxy_conn_meta_ctx_t *mctx = ctx->mctx_list;
|
|
while (mctx) {
|
|
unsigned long elapsed_time = now - mctx->access_time;
|
|
if (elapsed_time > CONN_EXPIRE_TIME) {
|
|
mctx->next_expired = *expired_conns;
|
|
*expired_conns = mctx;
|
|
}
|
|
|
|
mctx = mctx->next;
|
|
}
|
|
|
|
mctx = *expired_conns;
|
|
if (mctx) {
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_get_thr_expired_conns(): ----------------------------- Expired conns: thr=%d\n", ctx->thridx);
|
|
while (mctx) {
|
|
proxy_conn_meta_ctx_t *next = mctx->next_expired;
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, ">>> pxy_thrmgr_get_expired_conns(): thr=%d, fd=%d, fd2=%d, time=%lld\n",
|
|
mctx->thridx, mctx->fd, mctx->child_fd, (long int) now - mctx->access_time);
|
|
mctx = next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* vim: set noet ft=c: */
|