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//
// Copyright 2017 Ettus Research (National Instruments)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <mpm/net_helper.hpp>
#include <uhd/exception.hpp>
#include <boost/format.hpp>
#include <netdb.h>
#include <ifaddrs.h>
#include <linux/if_link.h>
#include <linux/if_packet.h>
#include <iomanip>
#include <iostream>
#include <string>
#include <sstream>
#include <cstring>
#include <cstdint>
namespace mpm {
namespace network{
template <typename ArrayType>
std::string bytearray_to_string(const ArrayType array[], size_t elements) {
std::stringstream result;
for (size_t i = 0; i < elements; i++) {
result << std::uppercase << std::setfill('0')
<< std::setw(sizeof(array[i]) *
2) // always produce 2 hex values for each byte
<< std::hex << +array[i]; // Implicit integer promotion
}
return result.str();
}
void print_net_ifaces(net_ifaces my_ifaces) {
/* take in a net_ifaces and pretty print information
about all detected network interfaces */
for (const auto& iface : my_ifaces) {
std::cout << "interface: " << iface.first << std::endl;
std::cout << "\tMAC: " << iface.second.mac_addr << std::endl;
for (const auto& addr : iface.second.ip_addr) {
std::cout << "\tip address: " << addr << std::endl;
}
}
}
net_ifaces get_net_map() {
/* Get a map containing a string and a net_iface struct
to describe all adresses assigned to a interface */
struct ifaddrs *ifaddr, *ifa;
int family, s;
char host[NI_MAXHOST];
net_ifaces net_map;
if (getifaddrs(&ifaddr) == -1) {
throw uhd::system_error(str(boost::format("Error: %s") % strerror(errno)));
}
/* Walk through linked list, maintaining head pointer so we
can free list later */
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL)
continue;
/* Put the interaface name into the map, if it already exists
we get an iterator to the existing element */
auto result = net_map.emplace(
std::make_pair(std::string(ifa->ifa_name), net_iface()));
auto current_iface = result.first;
family = ifa->ifa_addr->sa_family;
if (family == AF_INET || family == AF_INET6) {
s = getnameinfo(ifa->ifa_addr,
(family == AF_INET) ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6),
host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (s != 0) {
printf("getnameinfo() failed: %s\n", gai_strerror(s));
return net_map;
}
current_iface->second.ip_addr.push_back(std::string(host));
} else if (family == AF_PACKET && ifa->ifa_data != NULL) {
struct sockaddr_ll* s = (struct sockaddr_ll*)ifa->ifa_addr;
uint8_t mac_addr[6];
memcpy(&mac_addr, s->sll_addr, 6);
current_iface->second.mac_addr = bytearray_to_string(mac_addr, 6);
}
}
freeifaddrs(ifaddr);
return net_map;
}
std::vector<std::string> get_if_addrs(const std::string& mac_addr) {
/* Convenience wrapper to return all adresses associated with one
mac address */
net_ifaces my_map = get_net_map();
for (const auto& iface : my_map) { // find
if (iface.second.mac_addr == mac_addr) {
return iface.second.ip_addr;
}
}
return std::vector<std::string>();
}
}
}
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