/*
* Parse a binary message from a NETLINK_ROUTE netlink socket.
*
* Note that this function can only parse one message, because the message's
* content has to be stored in the class's member variables (mAction,
* mSubsystem, etc.). Invalid or unrecognized messages are skipped, but if
* there are multiple valid messages in the buffer, only the first one will be
* returned.
*
* TODO: consider only ever looking at the first message.
*/
bool NetlinkEvent::parseBinaryNetlinkMessage(char *buffer, int size) {
const struct nlmsghdr *nh;
for (nh = (struct nlmsghdr *) buffer;
NLMSG_OK(nh, (unsigned) size) && (nh->nlmsg_type != NLMSG_DONE);
nh = NLMSG_NEXT(nh, size)) {
if (!rtMessageName(nh->nlmsg_type)) {
SLOGD("Unexpected netlink message type %d\n", nh->nlmsg_type);
continue;
}
if (nh->nlmsg_type == RTM_NEWLINK) {
if (parseIfInfoMessage(nh))
return true;
} else if (nh->nlmsg_type == QLOG_NL_EVENT) {
if (parseUlogPacketMessage(nh))
return true;
} else if (nh->nlmsg_type == RTM_NEWADDR ||
nh->nlmsg_type == RTM_DELADDR) {
if (parseIfAddrMessage(nh))
return true;
} else if (nh->nlmsg_type == RTM_NEWROUTE ||
nh->nlmsg_type == RTM_DELROUTE) {
if (parseRtMessage(nh))
return true;
} else if (nh->nlmsg_type == RTM_NEWNDUSEROPT) {
if (parseNdUserOptMessage(nh))
return true;
}
}
return false;
}
/*
* Parse a binary message from a NETLINK_ROUTE netlink socket.
*/
bool NetlinkEvent::parseBinaryNetlinkMessage(char *buffer, int size) {
const struct nlmsghdr *nh;
for (nh = (struct nlmsghdr *) buffer;
NLMSG_OK(nh, (unsigned) size) && (nh->nlmsg_type != NLMSG_DONE);
nh = NLMSG_NEXT(nh, size)) {
if (nh->nlmsg_type == RTM_NEWLINK) {
int len = nh->nlmsg_len - sizeof(*nh);
struct ifinfomsg *ifi;
if (sizeof(*ifi) > (size_t) len) {
SLOGE("Got a short RTM_NEWLINK message\n");
continue;
}
ifi = (ifinfomsg *)NLMSG_DATA(nh);
if ((ifi->ifi_flags & IFF_LOOPBACK) != 0) {
continue;
}
struct rtattr *rta = (struct rtattr *)
((char *) ifi + NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nh, sizeof(*ifi));
while(RTA_OK(rta, len)) {
switch(rta->rta_type) {
case IFLA_IFNAME:
char buffer[16 + IFNAMSIZ];
snprintf(buffer, sizeof(buffer), "INTERFACE=%s",
(char *) RTA_DATA(rta));
mParams[0] = strdup(buffer);
mAction = (ifi->ifi_flags & IFF_LOWER_UP) ?
NlActionLinkUp : NlActionLinkDown;
mSubsystem = strdup("net");
break;
}
rta = RTA_NEXT(rta, len);
}
} else if (nh->nlmsg_type == QLOG_NL_EVENT) {
char *devname;
ulog_packet_msg_t *pm;
size_t len = nh->nlmsg_len - sizeof(*nh);
if (sizeof(*pm) > len) {
SLOGE("Got a short QLOG message\n");
continue;
}
pm = (ulog_packet_msg_t *)NLMSG_DATA(nh);
devname = pm->indev_name[0] ? pm->indev_name : pm->outdev_name;
asprintf(&mParams[0], "ALERT_NAME=%s", pm->prefix);
asprintf(&mParams[1], "INTERFACE=%s", devname);
mSubsystem = strdup("qlog");
mAction = NlActionChange;
} else if (nh->nlmsg_type == RTM_NEWADDR ||
nh->nlmsg_type == RTM_DELADDR) {
int len = nh->nlmsg_len - sizeof(*nh);
struct ifaddrmsg *ifa;
if (sizeof(*ifa) > (size_t) len) {
SLOGE("Got a short RTM_xxxADDR message\n");
continue;
}
ifa = (ifaddrmsg *)NLMSG_DATA(nh);
size_t rtasize = IFA_PAYLOAD(nh);
if (!parseIfAddrMessage(nh->nlmsg_type, ifa, rtasize)) {
continue;
}
} else if (nh->nlmsg_type == RTM_NEWNDUSEROPT) {
int len = nh->nlmsg_len - sizeof(*nh);
struct nduseroptmsg *ndmsg = (struct nduseroptmsg *) NLMSG_DATA(nh);
if (sizeof(*ndmsg) > (size_t) len) {
SLOGE("Got a short RTM_NEWNDUSEROPT message\n");
continue;
}
size_t optsize = NLMSG_PAYLOAD(nh, sizeof(*ndmsg));
if (!parseNdUserOptMessage(ndmsg, optsize)) {
continue;
}
} else {
SLOGD("Unexpected netlink message. type=0x%x\n",
nh->nlmsg_type);
}
}
return true;
}
