boost asio获取本机IP地址

直接上代码，这里只获取IPV4的地址，多个IP之间用分号间隔

std::string getLocalIpAddress()
{
    using boost::asio::ip::tcp;
    std::string result;
    try {
        boost::asio::io_service io_service;
        tcp::resolver resolver(io_service);
        tcp::resolver::query query(tcp::v4(), boost::asio::ip::host_name(), "");
        tcp::resolver::iterator iter = resolver.resolve(query);
        tcp::resolver::iterator end; // End marker.
        while (iter != end) {
            tcp::endpoint ep = *iter++;
            if (!result.empty()) {
                result += ";";
            }
            result += ep.address().to_string();
        }
    }
    catch (std::exception &e) {
        LOGGER_ERROR("get local ip address failed, " << e.what());
    }
    return result;
}

上面方法在linux上可能获取失败，错误信息：Host not found (authoritative)，用如下linux方法就可以了。

linux上获取本地IP

#include <stdio.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>

int main (int argc, const char * argv[]) {
    struct ifaddrs * ifAddrStruct = NULL;
    struct ifaddrs * ifa = NULL;
    void * tmpAddrPtr = NULL;

    getifaddrs(&ifAddrStruct);

    for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
        if (ifa ->ifa_addr->sa_family==AF_INET) { // Check it is
            // a valid IPv4 address
            tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
            char addressBuffer[INET_ADDRSTRLEN];
            inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
            printf("%s IP Address %s\n", ifa->ifa_name, addressBuffer);
        }
        else if (ifa->ifa_addr->sa_family==AF_INET6) { // Check it is
            // a valid IPv6 address
            tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
            char addressBuffer[INET6_ADDRSTRLEN];
            inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
            printf("%s IP Address %s\n", ifa->ifa_name, addressBuffer);
        }
    }
    if (ifAddrStruct != NULL)
        freeifaddrs(ifAddrStruct);
    return 0;
}