std::string macAsString(const struct ifaddrs *addr) {
static std::string blank_mac = "00:00:00:00:00:00";
if (addr->ifa_addr == nullptr) {
// No link or MAC exists.
return blank_mac;
}
#if defined(__linux__)
struct ifreq ifr;
ifr.ifr_addr.sa_family = AF_INET;
memcpy(ifr.ifr_name, addr->ifa_name, IFNAMSIZ);
int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (socket_fd < 0) {
return blank_mac;
}
ioctl(socket_fd, SIOCGIFHWADDR, &ifr);
close(socket_fd);
return macAsString(ifr.ifr_hwaddr.sa_data);
#else
auto sdl = (struct sockaddr_dl *)addr->ifa_addr;
if (sdl->sdl_alen != 6) {
// Do not support MAC address that are not 6 bytes...
return blank_mac;
}
return macAsString(&sdl->sdl_data[sdl->sdl_nlen]);
#endif
}
Status genArp(const struct rt_msghdr *route,
const AddressMap &addr_map,
Row &r) {
if (addr_map[RTAX_DST]->sa_family != AF_INET) {
return Status(1, "Not in ARP cache");
}
// The cache will always know the address.
r["address"] = ipAsString(addr_map[RTAX_DST]);
auto sdl = (struct sockaddr_dl *)addr_map[RTA_DST];
if (sdl->sdl_alen > 0) {
r["mac"] = macAsString(LLADDR(sdl));
} else {
r["mac"] = "incomplete";
}
// Note: also possible to detect published.
if (route->rtm_rmx.rmx_expire == 0) {
r["permanent"] = "1";
} else {
r["permanent"] = "0";
}
return Status(0, "OK");
}
void genDetailsFromAddr(const struct ifaddrs *addr, QueryData &results) {
Row r;
r["interface"] = std::string(addr->ifa_name);
r["mac"] = macAsString(addr);
if (addr->ifa_data != nullptr) {
#ifdef __linux__
// Linux/Netlink interface details parsing.
auto ifd = (struct rtnl_link_stats *)addr->ifa_data;
r["ipackets"] = BIGINT_FROM_UINT32(ifd->rx_packets);
r["opackets"] = BIGINT_FROM_UINT32(ifd->tx_packets);
r["ibytes"] = BIGINT_FROM_UINT32(ifd->rx_bytes);
r["obytes"] = BIGINT_FROM_UINT32(ifd->tx_bytes);
r["ierrors"] = BIGINT_FROM_UINT32(ifd->rx_errors);
r["oerrors"] = BIGINT_FROM_UINT32(ifd->tx_errors);
// Get Linux physical properties for the AF_PACKET entry.
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd >= 0) {
struct ifreq ifr;
memcpy(ifr.ifr_name, addr->ifa_name, IFNAMSIZ);
if (ioctl(fd, SIOCGIFMTU, &ifr) >= 0) {
r["mtu"] = BIGINT_FROM_UINT32(ifr.ifr_mtu);
}
if (ioctl(fd, SIOCGIFMETRIC, &ifr) >= 0) {
r["metric"] = BIGINT_FROM_UINT32(ifr.ifr_metric);
}
if (ioctl(fd, SIOCGIFHWADDR, &ifr) >= 0) {
r["type"] = INTEGER_FROM_UCHAR(ifr.ifr_hwaddr.sa_family);
}
}
r["last_change"] = "-1";
#else
// Apple and FreeBSD interface details parsing.
auto ifd = (struct if_data *)addr->ifa_data;
r["type"] = INTEGER_FROM_UCHAR(ifd->ifi_type);
r["mtu"] = BIGINT_FROM_UINT32(ifd->ifi_mtu);
r["metric"] = BIGINT_FROM_UINT32(ifd->ifi_metric);
r["ipackets"] = BIGINT_FROM_UINT32(ifd->ifi_ipackets);
r["opackets"] = BIGINT_FROM_UINT32(ifd->ifi_opackets);
r["ibytes"] = BIGINT_FROM_UINT32(ifd->ifi_ibytes);
r["obytes"] = BIGINT_FROM_UINT32(ifd->ifi_obytes);
r["ierrors"] = BIGINT_FROM_UINT32(ifd->ifi_ierrors);
r["oerrors"] = BIGINT_FROM_UINT32(ifd->ifi_oerrors);
r["last_change"] = BIGINT_FROM_UINT32(ifd->ifi_lastchange.tv_sec);
#endif
}
results.push_back(r);
}