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Disable IP_MULTICAST_ALL when setting up UDP multicast 

This avoids interference caused when two sockets are bound to the
same port in different multicast groups.

Fixes #241

Change-Id: Iba1b3300e3850f1f268886b7a49f5a3315d95b80
This commit is contained in:
KongQun Yang 2017-07-26 13:09:21 -07:00
parent b451d3a7ca
commit 723079310f
1 changed files with 23 additions and 0 deletions
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23
packager/file/udp_file.cc
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@ -7,16 +7,26 @@
#include "packager/file/udp_file.h" #include "packager/file/udp_file.h"
#if defined(OS_WIN) #if defined(OS_WIN)
#include <windows.h> #include <windows.h>
#include <ws2tcpip.h> #include <ws2tcpip.h>
#define close closesocket #define close closesocket
#else #else
#include <arpa/inet.h> #include <arpa/inet.h>
#include <errno.h> #include <errno.h>
#include <strings.h> #include <strings.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <unistd.h> #include <unistd.h>
#define INVALID_SOCKET -1 #define INVALID_SOCKET -1
// IP_MULTICAST_ALL has been supported since kernel version 2.6.31 but we may be
// building on a machine that is older than that.
#ifndef IP_MULTICAST_ALL
#define IP_MULTICAST_ALL 49
#endif
#endif // defined(OS_WIN) #endif // defined(OS_WIN)
#include <limits> #include <limits>
@ -216,6 +226,19 @@ bool UdpFile::Open() {
LOG(ERROR) << "Failed to join multicast group."; LOG(ERROR) << "Failed to join multicast group.";
return false; return false;
} }
#if defined(__linux__)
// Disable IP_MULTICAST_ALL to avoid interference caused when two sockets
// are bound to the same port but joined to different multicast groups.
const int optval_zero = 0;
if (setsockopt(new_socket.get(), IPPROTO_IP, IP_MULTICAST_ALL,
reinterpret_cast<const char*>(&optval_zero),
sizeof(optval_zero)) < 0 &&
errno != ENOPROTOOPT) {
LOG(ERROR) << "Failed to disable IP_MULTICAST_ALL option.";
return false;
}
#endif // #if defined(__linux__)
} }
// Set timeout if needed. // Set timeout if needed.