Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-10-18 07:45:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Bug 1579424 - P1 Traverse the whole routing table, r=michal

Browse Source 
Differential Revision: https://phabricator.services.mozilla.com/D48803

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Junior Hsu 2019-11-12 16:04:09 +00:00
parent 6c92f8d784
commit 049eb24005
1 changed files with 61 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
netwerk/system/mac/nsNetworkLinkService.mm
View File

@ -426,6 +426,7 @@ static int routingTable(char* gw, size_t aGwLen) {
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, nullptr, &needed, nullptr, 0) < 0) {
return 1;
}
@ -436,6 +437,66 @@ static int routingTable(char* gw, size_t aGwLen) {
return 3;
}
char ip[INET_ADDRSTRLEN];
char* lim = &buf[0] + needed;
// `next + 1 < lim` ensures we have valid `rtm->rtm_msglen` which is an
// unsigned short at the beginning of `rt_msghdr`.
for (char* next = &buf[0]; next + 1 < lim; next += rtm->rtm_msglen) {
rtm = reinterpret_cast<struct rt_msghdr*>(next);
if (next + rtm->rtm_msglen > lim) {
LOG(("Rt msg is truncated..."));
break;
}
// Ignore the routing table message without destination/gateway sockaddr.
// Destination address is needed to check if the gateway is default or
// overwritten by VPN. If yes, hash the mac address or IP/interface name.
if ((rtm->rtm_addrs & (RTA_DST | RTA_GATEWAY)) != (RTA_DST | RTA_GATEWAY)) {
continue;
}
sa = reinterpret_cast<struct sockaddr*>(rtm + 1);
struct sockaddr* destination =
reinterpret_cast<struct sockaddr*>((char*)sa + RTAX_DST * SA_SIZE(sa));
if (!destination || destination->sa_family != AF_INET) {
continue;
}
sockin = reinterpret_cast<struct sockaddr_in*>(destination);
inet_ntop(AF_INET, &sockin->sin_addr.s_addr, ip, sizeof(ip) - 1);
// TODO: only filtered non-predefined destination
// Ignore if destination is non-predefined.
if (strcmp(ip, "0.0.0.0")) {
continue;
}
struct sockaddr* gateway =
reinterpret_cast<struct sockaddr*>((char*)sa + RTAX_GATEWAY * SA_SIZE(sa));
if (!gateway) {
continue;
}
if (gateway->sa_family == AF_INET) {
sockin = reinterpret_cast<struct sockaddr_in*>(gateway);
inet_ntop(AF_INET, &sockin->sin_addr.s_addr, ip, sizeof(ip) - 1);
char mac[18];
if (scanArp(ip, mac, sizeof(mac))) {
// TODO: use the mac to calculate network id
}
} else if (gateway->sa_family == AF_LINK) {
char buf[64];
struct sockaddr_dl* sockdl = reinterpret_cast<struct sockaddr_dl*>(gateway);
if (getMac(sockdl, buf, sizeof(buf))) {
// TODO: use the mac to calculate network id
}
}
}
// There's no need to iterate over the routing table
// We're only looking for the first (default) gateway
rtm = reinterpret_cast<struct rt_msghdr*>(&buf[0]);