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559 lines
14 KiB
559 lines
14 KiB
// gcc -Wall -Werror -O2 -s -pedantic-errors -std=gnu99 -I/usr/include/libnl3 -o nl-neigh-list nl-neigh-list.c -lnl-route-3 -lnl-3
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// armeb-linux-gcc -Wall -Werror -O2 -s -std=gnu99 -I/usr/include/libnl3 -o nl-neigh-list nl-neigh-list.c -L. -lnl-route-3 -lnl-3 -lnl-nf-3 -lnl-genl-3
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// with libs static compiled: armeb-linux-gcc -Wall -Werror -O2 -s -std=gnu99 -I/usr/include/libnl3 -o nl-neigh-list nl-neigh-list.c -L. -Wl,-Bstatic -lnl-route-3 -lnl-3 -lnl-nf-3 -lnl-genl-3 -Wl,-Bdynamic -lpthread -ldl -lm
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extern "C" {
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#include <pthread.h>
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#include <netlink/socket.h>
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#include <linux/netlink.h>
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#include <netlink/netlink.h>
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#include <netlink/route/addr.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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}
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#include "interface.h"
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#include "utils.h"
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#include <iostream>
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#include <QStringList>
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#include <QTimer>
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#include <QtCore/QCoreApplication>
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#include <QDir>
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#include <QtDebug>
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#define BUFLEN 65535
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#define ADDRBUFLEN BUFLEN
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/*!
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\class Interface
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\brief The Interface class is used to manage IP addresses associated with an interface.
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*/
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/*!
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Constructs an Interface object. All operations will be limited to the specified \a interface.
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*/
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Interface::Interface(QString interface) :
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QObject(0),
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m_interface(interface),
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m_index(-1)
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{
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m_index = Utils::interfaceIndex(interface);
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}
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Interface::~Interface() {
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}
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/*!
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Set the interface's administrative link state to up. Requires that the CAP_NET_ADMIN capability be set on the application binary, or run as root (\a not \a recommended). Returns 0 on success, 1 on error.
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*/
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int Interface::setLinkUp() {
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struct rtnl_link *link, *link_orig = NULL;
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struct nl_sock *sock = NULL;
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QByteArray interfaceArray = m_interface.toLatin1();
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const char *interface = interfaceArray.constData();
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if((sock = Utils::connect())) {
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if(rtnl_link_get_kernel(sock, 0, interface, &link_orig) < 0) {
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std::cerr << "error looking up interface" << std::endl;
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nl_socket_free(sock);
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}else{
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if(!link_orig) {
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std::cerr << "can't get link" << std::endl;
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nl_socket_free(sock);
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return 1;
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}
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link = rtnl_link_alloc();
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if(!link) {
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std::cerr << "can't alloc link" << std::endl;
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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int err = 0;
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rtnl_link_set_flags(link, IFF_UP);
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if((err = rtnl_link_change(sock, link_orig, link, 0)) < 0) {
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//error = nl_geterror(err);
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rtnl_link_put(link);
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_link_put(link);
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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}
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return 0;
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}
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/*!
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Set the interface's administrative link state to down. Requires that the CAP_NET_ADMIN capability be set on the application binary, or run as root (\a not \a recommended). Returns 0 on success, 1 on error.
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*/
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int Interface::setLinkDown() {
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struct rtnl_link *link, *link_orig = NULL;
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struct nl_sock *sock = NULL;
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QByteArray interfaceArray = m_interface.toLatin1();
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const char *interface = interfaceArray.constData();
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if((sock = Utils::connect())) {
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if(rtnl_link_get_kernel(sock, 0, interface, &link_orig) < 0) {
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std::cerr << "error looking up interface" << std::endl;
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nl_socket_free(sock);
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}else{
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if(!link_orig) {
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std::cerr << "can't get link" << std::endl;
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nl_socket_free(sock);
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return 1;
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}
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link = rtnl_link_alloc();
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if(!link) {
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std::cerr << "can't alloc link" << std::endl;
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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int err = 0;
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rtnl_link_unset_flags(link, IFF_UP);
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if((err = rtnl_link_change(sock, link_orig, link, 0)) < 0) {
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//error = nl_geterror(err);
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rtnl_link_put(link);
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_link_put(link);
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rtnl_link_put(link_orig);
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nl_socket_free(sock);
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return 1;
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}
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}
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return 0;
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}
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/*!
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Add an IP address to the interface using the CIDR notation, e.g. 192.168.1.1/24. Requires that the CAP_NET_ADMIN capability be set on the application binary, or run as root (\a not \a recommended). Returns 0 on success, 1 on error.
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*/
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int Interface::addAddress(QString addressStr) const {
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struct nl_sock *sock = NULL;
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QByteArray addressArrayNoMask = addressStr.left(addressStr.indexOf('/')).toLatin1();
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QByteArray addressArray = addressStr.toLatin1();
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QString bitmask = addressStr.right(2);
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const char *addressDataNoMask = addressArrayNoMask.constData();
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const char *addressData = addressArray.constData();
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in_addr_t brdInt = inet_addr(addressDataNoMask);
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struct in_addr brd = { .s_addr = brdInt };
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int bitlen = bitmask.toInt();
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if(bitlen <= 30) {
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for(int i = 31; i >= bitlen; i--) {
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brd.s_addr |= htonl(1 << (31 - i));
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}
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}
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if(!(sock = Utils::connect())) {
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return 1;
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}
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struct rtnl_addr *addr = rtnl_addr_alloc();
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if(!addr) {
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nl_socket_free(sock);
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return 1;
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}
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struct nl_addr *address = NULL;
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struct nl_addr *bcast = NULL;
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struct nl_msg *result = NULL;
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int parseResult = nl_addr_parse(addressData, AF_UNSPEC, &address);
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if(parseResult != 0) {
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std::cerr << "could not parse address" << std::endl;
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rtnl_addr_put(addr);
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nl_socket_free(sock);
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return 1;
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}
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int parseBroadcastResult = nl_addr_parse(inet_ntoa(brd), AF_INET, &bcast);
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if(parseBroadcastResult != 0) {
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std::cerr << "could not parse broadcast address" << std::endl;
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_addr_set_ifindex(addr, m_index);
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rtnl_addr_set_local(addr, address);
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rtnl_addr_set_broadcast(addr, bcast);
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int ret = rtnl_addr_build_add_request(addr, 0, &result);
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if(ret != 0) {
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std::cerr << "could not build add request" << std::endl;
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nl_socket_free(sock);
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return 1;
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}
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if(rtnl_addr_add(sock, addr, 0) != 0) {
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std::cerr << "could not add address" << std::endl;
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nlmsg_free(result);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nlmsg_free(result);
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nl_socket_free(sock);
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return 0;
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}
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/*!
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Delete an IP address from the interface using the CIDR notation, e.g. 192.168.1.1/24. Requires that the CAP_NET_ADMIN capability be set on the application binary, or run as root (\a not \a recommended). Returns 0 on success, 1 on error.
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*/
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int Interface::deleteAddress(QString addressStr) const {
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struct nl_sock *sock = NULL;
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QByteArray addressArrayNoMask = addressStr.left(addressStr.indexOf('/')).toLatin1();
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QByteArray addressArray = addressStr.toLatin1();
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QString bitmask = addressStr.right(2);
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const char *addressDataNoMask = addressArrayNoMask.constData();
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const char *addressData = addressArray.constData();
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in_addr_t brdInt = inet_addr(addressDataNoMask);
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struct in_addr brd = { .s_addr = brdInt };
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int bitlen = bitmask.toInt();
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if(bitlen <= 30) {
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for(int i = 31; i >= bitlen; i--) {
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brd.s_addr |= htonl(1 << (31 - i));
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}
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}
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if(!(sock = Utils::connect())) {
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return 1;
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}
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struct rtnl_addr *addr = rtnl_addr_alloc();
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struct nl_addr *address = NULL;
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struct nl_addr *bcast = NULL;
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struct nl_msg *result = NULL;
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if(!addr) {
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std::cerr << "could not allocate address" << std::endl;
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nl_socket_free(sock);
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return 1;
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}
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int parseResult = nl_addr_parse(addressData, AF_UNSPEC, &address);
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if(parseResult != 0) {
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std::cerr << "could not parse address" << std::endl;
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rtnl_addr_put(addr);
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nl_socket_free(sock);
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return 1;
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}
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int parseBroadcastResult = nl_addr_parse(inet_ntoa(brd), AF_INET, &bcast);
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if(parseBroadcastResult != 0) {
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std::cerr << "could not parse broadcast address" << std::endl;
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_addr_set_ifindex(addr, m_index);
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rtnl_addr_set_local(addr, address);
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rtnl_addr_set_broadcast(addr, bcast);
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int ret = rtnl_addr_build_delete_request(addr, 0, &result);
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if(ret != 0) {
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std::cerr << "could not build add request" << std::endl;
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nl_socket_free(sock);
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return 1;
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}
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if(rtnl_addr_delete(sock, addr, 0) != 0) {
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std::cerr << "could not delete address" << std::endl;
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rtnl_addr_put(addr);
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nlmsg_free(result);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nl_socket_free(sock);
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return 1;
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}
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rtnl_addr_put(addr);
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nl_addr_put(address);
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nl_addr_put(bcast);
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nlmsg_free(result);
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nl_socket_free(sock);
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return 0;
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}
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/*!
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Returns true if the interface is administratively up, otherwise false if it is administratively down or if there was an error retrieving the status information. If there was an error, *ok will be set to false, otherwise it will be true.
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*/
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bool Interface::hasAdminLink(bool *ok) {
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struct rtnl_link *link = NULL;
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struct nl_sock *sock = NULL;
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QByteArray interfaceArray = m_interface.toLatin1();
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const char *interface = interfaceArray.constData();
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bool carrier = false;
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if((sock = Utils::connect())) {
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if(rtnl_link_get_kernel(sock, 0, interface, &link) < 0) {
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std::cerr << "error looking up interface" << std::endl;
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nl_socket_free(sock);
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}else{
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unsigned int flags = rtnl_link_get_flags(link);
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carrier = (flags & IFF_UP) == IFF_UP;
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rtnl_link_put(link);
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nl_socket_free(sock);
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if(ok != NULL) {
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*ok = true;
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}
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return carrier;
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}
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}
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if(ok != NULL) {
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*ok = false;
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}
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return false;
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}
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/*!
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Returns true if the interface is up and running (link-layer is up), and false if the link/interface is down, or if there was an error retrieving the status information. If there was an error, *ok will be set to false, otherwise it will be true.
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*/
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bool Interface::hasCarrier(bool *ok) {
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struct rtnl_link *link = NULL;
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struct nl_sock *sock = NULL;
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QByteArray interfaceArray = m_interface.toLatin1();
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const char *interface = interfaceArray.constData();
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bool carrier = false;
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if((sock = Utils::connect())) {
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if(rtnl_link_get_kernel(sock, 0, interface, &link) < 0) {
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std::cerr << "error looking up interface" << std::endl;
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nl_socket_free(sock);
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}else{
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unsigned int flags = rtnl_link_get_flags(link);
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carrier = flags & IFF_RUNNING;
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rtnl_link_put(link);
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nl_socket_free(sock);
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if(ok != NULL) {
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*ok = true;
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}
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return carrier;
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}
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}
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if(ok != NULL) {
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*ok = false;
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}
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return false;
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}
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/*!
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Returns a list of assigned IP addresses on the interface. All addresses include the subnet mask as CIDR notation (e.g. 192.168.1.1/24).
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*/
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QStringList Interface::addresses() const {
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struct nl_sock *sock = NULL;
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struct rtnl_addr *addr = NULL;
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struct nl_cache *addr_cache, *link_cache = NULL;
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struct nl_dump_params params;
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char buf[BUFLEN];
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char addrs[ADDRBUFLEN];
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QByteArray interfaceArray = m_interface.toLatin1();
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const char *interface = interfaceArray.constData();
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char *ipInterface = strndup(interface, strlen(interface));
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memset(¶ms, 0, sizeof(struct nl_dump_params));
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params.dp_type = NL_DUMP_LINE;
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params.dp_fd = NULL;
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params.dp_buf = buf;
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params.dp_buflen = BUFLEN;
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if(!(sock = Utils::connect())) {
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free(ipInterface);
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return QStringList();
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}
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if(Utils::alloc_addr_cache(sock, &addr_cache)) {
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free(ipInterface);
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nl_socket_free(sock);
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return QStringList();
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}
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if(Utils::alloc_link_cache(sock, &link_cache)) {
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free(ipInterface);
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nl_cache_free(addr_cache);
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nl_socket_free(sock);
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return QStringList();
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}
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if(!(addr = rtnl_addr_alloc())) {
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std::cerr << "could not allocate address" << std::endl;
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free(ipInterface);
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nl_cache_free(addr_cache);
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nl_cache_free(link_cache);
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nl_socket_free(sock);
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return QStringList();
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}
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rtnl_addr_set_family(addr, AF_INET);
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int ival = 0;
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if(!(ival = rtnl_link_name2i(link_cache, ipInterface))) {
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std::cerr << "Link " << ipInterface << " does not exist" << std::endl;
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free(ipInterface);
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rtnl_addr_put(addr);
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nl_cache_free(addr_cache);
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nl_cache_free(link_cache);
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nl_socket_free(sock);
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return QStringList();
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}
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rtnl_addr_set_ifindex(addr, ival);
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memset(buf, 0, BUFLEN);
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memset(addrs, 0, ADDRBUFLEN);
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nl_cache_dump_filter(addr_cache, ¶ms, OBJ_CAST(addr));
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buf[BUFLEN - 1] = '\0';
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QString addrsString = buf;
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QStringList addrsLines = addrsString.split('\n');
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QStringList addrsList;
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foreach(QString addrString, addrsLines) {
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QStringList fields = addrString.split(' ');
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if(fields.count() > 0) {
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QString address = fields.at(0);
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if(!address.isEmpty()) {
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addrsList << fields.at(0);
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}
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}else{
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std::cerr << "empty line: " << qPrintable(fields.join(' ')) << std::endl;
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}
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}
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free(ipInterface);
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rtnl_addr_put(addr);
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nl_cache_free(addr_cache);
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nl_cache_free(link_cache);
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nl_socket_free(sock);
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return addrsList;
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}
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/*!
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Returns a list of all interfaces on the system.
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*/
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QStringList Interface::list() {
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struct nl_sock *sock = NULL;
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struct nl_cache *link_cache = NULL;
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QStringList linkList;
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if(!(sock = Utils::connect())) {
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return QStringList();
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}
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if(Utils::alloc_link_cache(sock, &link_cache)) {
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nl_socket_free(sock);
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return QStringList();
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}
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int index = 1;
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forever {
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struct rtnl_link *link = rtnl_link_get(link_cache, index);
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|
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if(link != NULL) {
|
|
char *name = rtnl_link_get_name(link);
|
|
|
|
linkList << name;
|
|
|
|
rtnl_link_put(link);
|
|
}else{
|
|
break;
|
|
}
|
|
|
|
++index;
|
|
}
|
|
|
|
nl_cache_free(link_cache);
|
|
nl_socket_free(sock);
|
|
|
|
// workaround for libnl issue: https://github.com/tgraf/libnl/issues/49
|
|
// find any interfaces libnl doesn't know about (e.g. USB wireless adapters after they've been unplugged and replugged)
|
|
QDir dir("/sys/class/net");
|
|
QStringList interfaces = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
|
|
|
|
foreach(QString interface, interfaces) {
|
|
if(!linkList.contains(interface)) {
|
|
linkList << interface;
|
|
}
|
|
}
|
|
|
|
linkList.sort();
|
|
|
|
return linkList;
|
|
}
|
|
|
|
/*!
|
|
Returns the name of the interface used when the Interface object was constructed.
|
|
*/
|
|
const QString& Interface::name() const {
|
|
return m_interface;
|
|
}
|
|
|