mpm: python refactoring

1 files changed, 118 insertions, 0 deletions

diff --git a/mpm/lib/net_helper.cpp b/mpm/lib/net_helper.cpp
new file mode 100644
index 000000000..0da8de3cf
--- /dev/null
+++ b/mpm/lib/net_helper.cpp
@@ -0,0 +1,118 @@
+//
+// 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 "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>();
+}
+}
+}