src/test-apps/TapAddrAutoconf.cpp

/*
 *
 *    Copyright (c) 2019 Google LLC.
 *    All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "TapAddrAutoconf.h"
#include <inttypes.h>
#include <stdint.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <arpa/inet.h>

int CollectTapAddresses(std::vector<char *>  &addresses, const char * ifName) {
    struct ifaddrs *addrsList, *curAddr;
    const int err = getifaddrs(&addrsList);

    if (err == 0)
    {
        curAddr = addrsList;
        while (curAddr)
        {
            if (strcmp(ifName, curAddr->ifa_name) == 0)
            {
                char buf[INET6_ADDRSTRLEN];
                const char * rv;
                char *tmp;
                rv = inet_ntop(curAddr->ifa_addr->sa_family,
                               curAddr->ifa_addr->sa_family == AF_INET6 ?
                               (const void *)&(((sockaddr_in6 *)curAddr->ifa_addr)->sin6_addr) :
                               (const void *)&(((sockaddr_in *)curAddr->ifa_addr)->sin_addr),
                               buf, sizeof(buf));
                if (rv != NULL)
                {
                    tmp = (char *)malloc(strlen(buf));
                    strcpy(tmp, buf);
                    addresses.push_back(tmp);
                }
            }
            curAddr = curAddr->ifa_next;
        }
        freeifaddrs(addrsList);
    }
    else
    {
        return -1;
    }
    return 0;
}