int rtmon_read_event(struct rtmon_t *rtmon) {
struct sockaddr_nl nladdr;
struct msghdr msg;
struct iovec iov[2];
struct nlmsghdr nlh;
char buffer[65536];
int ret;
iov[0].iov_base = (void *)&nlh;
iov[0].iov_len = sizeof(nlh);
iov[1].iov_base = (void *)buffer;
iov[1].iov_len = sizeof(buffer);
msg.msg_name = (void *)&(nladdr);
msg.msg_namelen = sizeof(nladdr);
msg.msg_iov = iov;
msg.msg_iovlen = sizeof(iov)/sizeof(iov[0]);
ret = recvmsg(rtmon->fd, &msg, 0);
if (ret < 0) {
return ret;
}
syslog(LOG_DEBUG, "Type: %i (%s)",(nlh.nlmsg_type),lookup_name(typenames,nlh.nlmsg_type));
#define FLAG(x) if (nlh.nlmsg_flags & x) printf(" %s",#x)
FLAG(NLM_F_REQUEST);
FLAG(NLM_F_MULTI);
FLAG(NLM_F_ACK);
FLAG(NLM_F_ECHO);
FLAG(NLM_F_REPLACE);
FLAG(NLM_F_EXCL);
FLAG(NLM_F_CREATE);
FLAG(NLM_F_APPEND);
#undef FLAG
syslog(LOG_DEBUG, "Seq : %i Pid : %i",nlh.nlmsg_seq,nlh.nlmsg_pid);
rtmon_discover_ifaces(rtmon);
rtmon_discover_routes(rtmon);
if (_options.debug) {
rtmon_print_ifaces(rtmon, 1);
rtmon_print_routes(rtmon, 1);
}
rtmon_check_updates(rtmon);
return 0;
}
int rtmon_init(struct rtmon_t *rtmon, rtmon_callback func) {
memset(rtmon, 0, sizeof(struct rtmon_t));
rtmon->fd = open_netlink();
rtmon->cb = func;
if (rtmon->fd > 0) {
rtmon_discover_ifaces(rtmon);
rtmon_discover_routes(rtmon);
if (_options.debug) {
rtmon_print_ifaces(rtmon, 1);
rtmon_print_routes(rtmon, 1);
}
rtmon_check_updates(rtmon);
return 0;
}
return -1;
}