int BandwidthController::getTetherStats(SocketClient *cli, TetherStats &stats, std::string &extraProcessingInfo) {
int res;
std::string fullCmd;
FILE *iptOutput;
/*
* Why not use some kind of lib to talk to iptables?
* Because the only libs are libiptc and libip6tc in iptables, and they are
* not easy to use. They require the known iptables match modules to be
* preloaded/linked, and require apparently a lot of wrapper code to get
* the wanted info.
*/
fullCmd = IPTABLES_PATH;
fullCmd += " -nvx -w -L ";
fullCmd += NatController::LOCAL_TETHER_COUNTERS_CHAIN;
iptOutput = popen(fullCmd.c_str(), "r");
if (!iptOutput) {
ALOGE("Failed to run %s err=%s", fullCmd.c_str(), strerror(errno));
extraProcessingInfo += "Failed to run iptables.";
return -1;
}
res = parseForwardChainStats(cli, stats, iptOutput, extraProcessingInfo);
pclose(iptOutput);
/* Currently NatController doesn't do ipv6 tethering, so we are done. */
return res;
}
int BandwidthController::getTetherStats(TetherStats &stats, std::string &extraProcessingInfo) {
int res;
std::string fullCmd;
FILE *iptOutput;
const char *cmd;
if (stats.rxBytes != -1 || stats.txBytes != -1) {
ALOGE("Unexpected input stats. Byte counts should be -1.");
return -1;
}
/*
* Why not use some kind of lib to talk to iptables?
* Because the only libs are libiptc and libip6tc in iptables, and they are
* not easy to use. They require the known iptables match modules to be
* preloaded/linked, and require apparently a lot of wrapper code to get
* the wanted info.
*/
fullCmd = IPTABLES_PATH;
fullCmd += " -nvx -L natctrl_FORWARD";
iptOutput = popen(fullCmd.c_str(), "r");
if (!iptOutput) {
ALOGE("Failed to run %s err=%s", fullCmd.c_str(), strerror(errno));
extraProcessingInfo += "Failed to run iptables.";
return -1;
}
res = parseForwardChainStats(stats, iptOutput, extraProcessingInfo);
pclose(iptOutput);
/* Currently NatController doesn't do ipv6 tethering, so we are done. */
return res;
}
