mirror of
https://github.com/sonertari/SSLproxy
synced 2024-10-31 21:20:21 +00:00
613 lines
17 KiB
C
613 lines
17 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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#include <sys/param.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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static void
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pxy_thrmgr_get_thr_expired_conns(pxy_thr_ctx_t *tctx, pxy_conn_ctx_t **expired_conns)
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{
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*expired_conns = NULL;
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if (tctx->conns) {
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time_t now = time(NULL);
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pxy_conn_ctx_t *ctx = tctx->conns;
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while (ctx) {
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unsigned long elapsed_time = now - ctx->atime;
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if (elapsed_time > tctx->thrmgr->opts->conn_idle_timeout) {
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ctx->next_expired = *expired_conns;
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*expired_conns = ctx;
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}
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ctx = ctx->next;
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}
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if (tctx->thrmgr->opts->statslog) {
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char *src_addr = NULL;
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char *dst_addr = NULL;
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ctx = *expired_conns;
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while (ctx) {
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src_addr = NULL;
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if (ctx->srchost_str) {
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if (asprintf(&src_addr, ", src_addr=%s:%s", ctx->srchost_str, ctx->srcport_str) < 0) {
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goto leave;
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}
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}
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dst_addr = NULL;
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if (ctx->dsthost_str) {
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if (asprintf(&dst_addr, ", dst_addr=%s:%s", ctx->dsthost_str, ctx->dstport_str) < 0) {
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goto leave;
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}
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}
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_get_expired_conns: thr=%d, fd=%d, child_fd=%d, time=%lld%s%s\n",
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ctx->thr->thridx, ctx->fd, ctx->child_fd, (long int) now - ctx->atime, src_addr, dst_addr);
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#endif /* DEBUG_PROXY */
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char *msg;
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if (asprintf(&msg, "EXPIRED: thr=%d, time=%lld%s%s\n",
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ctx->thr->thridx, (long int) now - ctx->atime, src_addr, dst_addr)) {
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goto leave;
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}
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free(src_addr);
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src_addr = NULL;
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free(dst_addr);
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dst_addr = NULL;
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if (log_stats(msg) == -1) {
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log_err_level_printf(LOG_WARNING, "Stats logging failed\n");
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}
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free(msg);
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ctx = ctx->next_expired;
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}
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leave:
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if (src_addr) {
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free(src_addr);
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}
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if (dst_addr) {
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free(dst_addr);
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}
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}
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}
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}
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static evutil_socket_t
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pxy_thrmgr_print_child(pxy_conn_child_ctx_t *child_ctx, unsigned int parent_idx, evutil_socket_t max_fd)
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{
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assert(child_ctx != NULL);
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// @attention No need to log child stats
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#ifdef DEBUG_PROXY
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char *msg;
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if (asprintf(&msg, "CHILD CONN: thr=%d, id=%d, pid=%u, src=%d, dst=%d, c=%d-%d\n",
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child_ctx->parent->thr->thridx, child_ctx->idx, parent_idx, child_ctx->src_fd, child_ctx->dst_fd, child_ctx->src.closed, child_ctx->dst.closed) < 0) {
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return max_fd;
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}
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_print_child: %s", msg);
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free(msg);
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#endif /* DEBUG_PROXY */
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if (child_ctx->next) {
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max_fd = pxy_thrmgr_print_child(child_ctx->next, parent_idx, max_fd);
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}
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return MAX(max_fd, MAX(child_ctx->src_fd, child_ctx->dst_fd));
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}
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static void
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pxy_thrmgr_print_thr_info(pxy_thr_ctx_t *tctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_print_thr_info: thr=%d, load=%lu\n", tctx->thridx, tctx->load);
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#endif /* DEBUG_PROXY */
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unsigned int idx = 1;
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evutil_socket_t max_fd = 0;
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time_t max_atime = 0;
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time_t max_ctime = 0;
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#ifdef DEBUG_PROXY
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char *lmsg = NULL;
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#endif /* DEBUG_PROXY */
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char *smsg = NULL;
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char *src_addr = NULL;
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char *dst_addr = NULL;
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if (tctx->conns) {
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time_t now = time(NULL);
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pxy_conn_ctx_t *ctx = tctx->conns;
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while (ctx) {
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time_t atime = now - ctx->atime;
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time_t ctime = now - ctx->ctime;
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char *src_addr = NULL;
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if (ctx->srchost_str) {
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if (asprintf(&src_addr, ", src_addr=%s:%s", ctx->srchost_str, ctx->srcport_str) < 0) {
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goto leave;
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}
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}
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char *dst_addr = NULL;
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if (ctx->dsthost_str) {
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if (asprintf(&dst_addr, ", dst_addr=%s:%s", ctx->dsthost_str, ctx->dstport_str) < 0) {
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goto leave;
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}
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}
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#ifdef DEBUG_PROXY
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if (asprintf(&lmsg, "PARENT CONN: thr=%d, id=%u, fd=%d, child_fd=%d, dst=%d, srv_dst=%d, child_src=%d, child_dst=%d, p=%d-%d-%d c=%d-%d, ce=%d cc=%d, at=%lld ct=%lld%s%s\n",
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tctx->thridx, idx, ctx->fd, ctx->child_fd, ctx->dst_fd, ctx->srv_dst_fd, ctx->child_src_fd, ctx->child_dst_fd,
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ctx->src.closed, ctx->dst.closed, ctx->srv_dst.closed, ctx->children ? ctx->children->src.closed : 0, ctx->children ? ctx->children->dst.closed : 0,
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ctx->children ? 1:0, ctx->child_count, atime, ctime, src_addr ? src_addr : "", dst_addr ? dst_addr : "") < 0) {
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goto leave;
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}
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_print_thr_info: %s", lmsg);
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free(lmsg);
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lmsg = NULL;
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#endif /* DEBUG_PROXY */
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// @attention Report idle connections only, i.e. the conns which have been idle since the last time we checked for expired conns
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if (atime >= tctx->thrmgr->opts->expired_conn_check_period) {
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if (asprintf(&smsg, "IDLE: thr=%d, id=%u, ce=%d cc=%d, at=%lld ct=%lld%s%s\n",
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tctx->thridx, idx, ctx->children ? 1:0, ctx->child_count, atime, ctime, src_addr ? src_addr : "", dst_addr ? dst_addr : "") < 0) {
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goto leave;
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}
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if (log_stats(smsg) == -1) {
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log_err_level_printf(LOG_WARNING, "Stats logging failed\n");
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}
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free(smsg);
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smsg = NULL;
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}
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free(src_addr);
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src_addr = NULL;
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free(dst_addr);
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dst_addr = NULL;
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max_fd = MAX(max_fd, MAX(ctx->fd, MAX(ctx->child_fd, MAX(ctx->dst_fd, MAX(ctx->srv_dst_fd, MAX(ctx->child_src_fd, ctx->child_dst_fd))))));
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max_atime = MAX(max_atime, atime);
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max_ctime = MAX(max_ctime, ctime);
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if (ctx->children) {
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max_fd = pxy_thrmgr_print_child(ctx->children, idx, max_fd);
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}
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idx++;
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ctx = ctx->next;
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}
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}
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if (asprintf(&smsg, "STATS: thr=%d, mld=%lu, mfd=%d, mat=%lld, mct=%lld, iib=%llu, iob=%llu, eib=%llu, eob=%llu, swm=%lu, uwm=%lu, to=%lu, err=%lu, si=%u\n",
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tctx->thridx, tctx->max_load, tctx->max_fd, max_atime, max_ctime, tctx->intif_in_bytes, tctx->intif_out_bytes, tctx->extif_in_bytes, tctx->extif_out_bytes,
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tctx->set_watermarks, tctx->unset_watermarks, tctx->timedout_conns, tctx->errors, tctx->stats_idx) < 0) {
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goto leave;
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}
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_print_thr_info: %s", smsg);
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#endif /* DEBUG_PROXY */
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if (log_stats(smsg) == -1) {
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log_err_level_printf(LOG_WARNING, "Stats logging failed\n");
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}
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free(smsg);
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smsg = NULL;
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tctx->stats_idx++;
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tctx->timedout_conns = 0;
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tctx->errors = 0;
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tctx->set_watermarks = 0;
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tctx->unset_watermarks = 0;
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tctx->intif_in_bytes = 0;
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tctx->intif_out_bytes = 0;
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tctx->extif_in_bytes = 0;
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tctx->extif_out_bytes = 0;
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// Reset these stats with the current values (do not reset to 0 directly, there may be active conns)
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tctx->max_fd = max_fd;
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tctx->max_load = tctx->load;
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leave:
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if (src_addr) {
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free(src_addr);
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}
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if (dst_addr) {
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free(dst_addr);
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}
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#ifdef DEBUG_PROXY
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if (lmsg) {
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free(lmsg);
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}
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#endif /* DEBUG_PROXY */
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if (smsg) {
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free(smsg);
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}
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}
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/*
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* 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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pxy_thr_ctx_t *ctx = arg;
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_timer_cb: thr=%d, load=%lu, to=%u\n", ctx->thridx, ctx->load, ctx->timeout_count);
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#endif /* DEBUG_PROXY */
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pxy_conn_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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#ifdef DEBUG_PROXY
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time_t now = time(NULL);
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#endif /* DEBUG_PROXY */
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while (expired) {
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pxy_conn_ctx_t *next = expired->next_expired;
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_thrmgr_timer_cb: Delete timed out conn thr=%d, fd=%d, child_fd=%d, at=%lld ct=%lld\n",
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expired->thr->thridx, expired->fd, expired->child_fd, (long int) now - expired->atime, (long int) now - expired->ctime);
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#endif /* DEBUG_PROXY */
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pxy_conn_free(expired, 1);
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ctx->timedout_conns++;
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expired = next;
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}
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}
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// @attention Print thread info only if stats logging is enabled, if disabled debug logs are not printed either
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if (ctx->thrmgr->opts->statslog) {
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ctx->timeout_count++;
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if (ctx->timeout_count * ctx->thrmgr->opts->expired_conn_check_period >= ctx->thrmgr->opts->stats_period * ctx->thrmgr->opts->expired_conn_check_period) {
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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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/*
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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 = {ctx->thrmgr->opts->expired_conn_check_period, 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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if (pthread_mutex_init(&ctx->mutex, NULL)) {
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log_dbg_printf("Failed to initialize mutex\n");
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goto leave;
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}
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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]->conns = NULL;
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ctx->thr[idx]->thridx = idx;
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ctx->thr[idx]->timeout_count = 0;
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ctx->thr[idx]->thrmgr = ctx;
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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)
|
|
{
|
|
pthread_mutex_destroy(&ctx->mutex);
|
|
if (ctx->thr) {
|
|
for (int idx = 0; idx < ctx->num_thr; idx++) {
|
|
event_base_loopbreak(ctx->thr[idx]->evbase);
|
|
sched_yield();
|
|
}
|
|
for (int idx = 0; idx < ctx->num_thr; idx++) {
|
|
pthread_join(ctx->thr[idx]->thr, NULL);
|
|
}
|
|
for (int idx = 0; idx < ctx->num_thr; idx++) {
|
|
if (ctx->thr[idx]->dnsbase) {
|
|
evdns_base_free(ctx->thr[idx]->dnsbase, 0);
|
|
}
|
|
if (ctx->thr[idx]->evbase) {
|
|
event_base_free(ctx->thr[idx]->evbase);
|
|
}
|
|
free(ctx->thr[idx]);
|
|
}
|
|
free(ctx->thr);
|
|
}
|
|
free(ctx);
|
|
}
|
|
|
|
static void
|
|
pxy_thrmgr_remove_conn(pxy_conn_ctx_t *node, pxy_conn_ctx_t **head)
|
|
{
|
|
assert(node != NULL);
|
|
assert(*head != NULL);
|
|
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_remove_conn: Removing conn, fd=%d, child_fd=%d\n", node->fd, node->child_fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
// @attention We may get multiple conns with the same fd combinations, so fds cannot uniquely define a conn; hence the need for uuids.
|
|
if (uuid_compare(node->uuid, (*head)->uuid, NULL) == 0) {
|
|
*head = (*head)->next;
|
|
return;
|
|
}
|
|
|
|
pxy_conn_ctx_t *current = (*head)->next;
|
|
pxy_conn_ctx_t *previous = *head;
|
|
while (current != NULL && previous != NULL) {
|
|
if (uuid_compare(node->uuid, current->uuid, NULL) == 0) {
|
|
previous->next = current->next;
|
|
return;
|
|
}
|
|
previous = current;
|
|
current = current->next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attach a new connection to a thread. Chooses the thread with the fewest
|
|
* currently active connections, returns the appropriate event bases.
|
|
* Returns the index of the chosen thread (for passing to _detach later).
|
|
* This function cannot fail.
|
|
*/
|
|
void
|
|
pxy_thrmgr_attach(pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_attach: ENTER\n");
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
int thridx = 0;
|
|
size_t minload;
|
|
|
|
pxy_thrmgr_ctx_t *tmctx = ctx->thrmgr;
|
|
pthread_mutex_lock(&tmctx->mutex);
|
|
|
|
minload = tmctx->thr[thridx]->load;
|
|
#ifdef DEBUG_THREAD
|
|
log_dbg_printf("===> Proxy connection handler thread status:\n"
|
|
"thr[%d]: %zu\n", thridx, minload);
|
|
#endif /* DEBUG_THREAD */
|
|
for (int idx = 1; idx < tmctx->num_thr; idx++) {
|
|
#ifdef DEBUG_THREAD
|
|
log_dbg_printf("thr[%d]: %zu\n", idx, tmctx->thr[idx]->load);
|
|
#endif /* DEBUG_THREAD */
|
|
if (minload > tmctx->thr[idx]->load) {
|
|
minload = tmctx->thr[idx]->load;
|
|
thridx = idx;
|
|
}
|
|
}
|
|
|
|
ctx->thr = tmctx->thr[thridx];
|
|
ctx->thr->load++;
|
|
ctx->thr->max_load = MAX(ctx->thr->max_load, ctx->thr->load);
|
|
|
|
pthread_mutex_unlock(&tmctx->mutex);
|
|
|
|
ctx->evbase = ctx->thr->evbase;
|
|
ctx->dnsbase = ctx->thr->dnsbase;
|
|
|
|
ctx->next = ctx->thr->conns;
|
|
ctx->thr->conns = ctx;
|
|
|
|
// @attention We are running on the thrmgr thread, do not call conn thread functions here.
|
|
//pxy_thrmgr_print_thr_info(ctx->thr);
|
|
|
|
#ifdef DEBUG_THREAD
|
|
log_dbg_printf("thridx: %d\n", thridx);
|
|
#endif /* DEBUG_THREAD */
|
|
}
|
|
|
|
void
|
|
pxy_thrmgr_attach_child(pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_attach_child: ENTER\n");
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
pthread_mutex_lock(&ctx->thrmgr->mutex);
|
|
ctx->thr->load++;
|
|
ctx->thr->max_load = MAX(ctx->thr->max_load, ctx->thr->load);
|
|
pthread_mutex_unlock(&ctx->thrmgr->mutex);
|
|
}
|
|
|
|
/*
|
|
* Detach a connection from a thread by index.
|
|
* This function cannot fail.
|
|
*/
|
|
void
|
|
pxy_thrmgr_detach(pxy_conn_ctx_t *ctx)
|
|
{
|
|
assert(ctx->children == NULL);
|
|
|
|
pthread_mutex_lock(&ctx->thrmgr->mutex);
|
|
ctx->thr->load--;
|
|
pxy_thrmgr_remove_conn(ctx, &ctx->thr->conns);
|
|
pthread_mutex_unlock(&ctx->thrmgr->mutex);
|
|
}
|
|
|
|
void
|
|
pxy_thrmgr_detach_child(pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_thrmgr_detach_child: ENTER\n");
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
pthread_mutex_lock(&ctx->thrmgr->mutex);
|
|
ctx->thr->load--;
|
|
pthread_mutex_unlock(&ctx->thrmgr->mutex);
|
|
}
|
|
|
|
/* vim: set noet ft=c: */
|