Skip to content

Read and parse all of /proc/net/dev_mcast #2565

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
hexchain wants to merge 1 commit into
base: dev
Choose a base branch
from
+22 −23
Open

Read and parse all of /proc/net/dev_mcast #2565

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
45 changes: 22 additions & 23 deletions osdep/LinuxEthernetTap.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fstream>
#include <ifaddrs.h>
#include <linux/if.h>
#include <linux/if_addr.h>
Expand Down Expand Up @@ -524,32 +525,30 @@ void LinuxEthernetTap::setFriendlyName(const char* friendlyName)

void LinuxEthernetTap::scanMulticastGroups(std::vector<MulticastGroup>& added, std::vector<MulticastGroup>& removed)
{
char *ptr, *ptr2;
unsigned char mac[6];
std::vector<MulticastGroup> newGroups;

int fd = ::open("/proc/net/dev_mcast", O_RDONLY);
if (fd > 0) {
char buf[131072];
int n = (int)::read(fd, buf, sizeof(buf));
if ((n > 0) && (n < (int)sizeof(buf))) {
buf[n] = (char)0;
for (char* l = strtok_r(buf, "\r\n", &ptr); (l); l = strtok_r((char*)0, "\r\n", &ptr)) {
int fno = 0;
char* devname = (char*)0;
char* mcastmac = (char*)0;
for (char* f = strtok_r(l, " \t", &ptr2); (f); f = strtok_r((char*)0, " \t", &ptr2)) {
if (fno == 1)
devname = f;
else if (fno == 4)
mcastmac = f;
++fno;
}
if ((devname) && (! strcmp(devname, _dev.c_str())) && (mcastmac) && (Utils::unhex(mcastmac, mac, 6) == 6))
newGroups.push_back(MulticastGroup(MAC(mac, 6), 0));
}
std::ifstream ifs("/proc/net/dev_mcast");
while (ifs.good()) {
char l[256];

ifs.getline(l, sizeof(l));
if (l[0] == '\0')
continue;

int fno = 0;
unsigned char mac[6];
char* ptr;
char* devname = (char*)0;
char* mcastmac = (char*)0;
for (char* f = strtok_r(l, " \t", &ptr); (f); f = strtok_r((char*)0, " \t", &ptr)) {
if (fno == 1)
devname = f;
else if (fno == 4)
mcastmac = f;
++fno;
}
::close(fd);
if ((devname) && (! strcmp(devname, _dev.c_str())) && (mcastmac) && (Utils::unhex(mcastmac, mac, 6) == 6))
newGroups.push_back(MulticastGroup(MAC(mac, 6), 0));
}

std::vector<InetAddress> allIps(ips());
Expand Down