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118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* Copyright (c) 2019-2020 Job Snijders <job@sobornost.net>
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* Copyright (c) 2007-2019 Alexandre Snarskii <snar@snar.spb.ru>
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* All rights reserved.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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#include "sx_report.h"
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int
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sx_maxsockbuf(int s, int dir)
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{
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int optval = 0, voptval;
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int hiconf = -1, loconf = -1;
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unsigned int voptlen;
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int phase = 0, iterations = 0;
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if (s < 0) {
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sx_report(SX_FATAL,"Unable to maximize sockbuf on invalid "
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"socket %i\n", s);
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exit(1);
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}
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voptlen = sizeof(optval);
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if (getsockopt(s, SOL_SOCKET, dir, (void*)&optval, &voptlen) == -1) {
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sx_report(SX_ERROR,"initial getsockopt failed: %s\n",
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strerror(errno));
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return -1;
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}
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for (;;) {
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iterations++;
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if (phase == 0)
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optval <<= 1;
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else {
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if (optval == (hiconf + loconf) / 2)
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break;
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optval = (hiconf + loconf) / 2;
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}
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if (setsockopt(s, SOL_SOCKET, dir, (void*)&optval,
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sizeof(optval)) == -1) {
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if (phase == 0)
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phase = 1;
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hiconf = optval;
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continue;
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} else {
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loconf = optval;
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}
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voptlen = sizeof(voptval);
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if (getsockopt(s, SOL_SOCKET, dir, (void*)&voptval,
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&voptlen) == -1) {
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sx_report(SX_ERROR,"getsockopt failed: %s\n",
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strerror(errno));
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return -1;
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} else if (voptval < optval) {
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if (phase == 0) {
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phase = 1;
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optval >>= 1;
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continue;
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} else if (phase == 1) {
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phase = 2;
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optval -= 2048;
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continue;
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} else
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break;
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}
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}
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voptlen = sizeof(voptval);
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if (getsockopt(s, SOL_SOCKET, dir, (void*)&voptval,
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&voptlen) == -1) {
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sx_report(SX_ERROR,"getsockopt(final stage) failed: %s\n",
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strerror(errno));
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return -1;
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} else
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return voptval;
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}
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