mirror of
https://github.com/bgp/bgpq4
synced 2025-02-28 08:53:11 +00:00
110 lines
2.1 KiB
C
110 lines
2.1 KiB
C
#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 "sx_report.h"
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#ifndef SX_MAXSOCKBUF_MAX
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#define SX_MAXSOCKBUF_MAX (2*1024*1024)
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#endif
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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 (optval > SX_MAXSOCKBUF_MAX && phase == 0)
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break;
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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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} else if (voptval >= SX_MAXSOCKBUF_MAX) {
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/*
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* ... and getsockopt not failed and voptval>=optval.
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* Do not allow to increase sockbuf too much even in
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* case OS permits it
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*/
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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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/*
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printf("Finally got %i bytes of recvspace in %i interations\n",
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voptval, iterations);
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*/
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}
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return voptval;
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}
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