get_ip.cpp

#include <iostream>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <stdlib.h>
#include <netdb.h>
#include <unistd.h>
#include <ifaddrs.h>
#include <net/if.h>

#include <vector>
#include <utility>
#include <unordered_set>
#include <unistd.h>
#include <sys/syscall.h>

#define NI_MAXHOST 1025

void get_ip_addresses() {
    struct ifaddrs *ifaddr, *ifa;
    char host[NI_MAXHOST];

    if(getifaddrs(&ifaddr) == -1) {
        perror("getifaddrs");
        exit(EXIT_FAILURE);
    }

    for(ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
        if(ifa->ifa_addr == NULL)
            continue;

        if(ifa->ifa_addr->sa_family == AF_INET) { // 检查是否为 IPv4 地址
            (void)getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
            std::cout << "Interface: " << ifa->ifa_name << " Address: " << host << std::endl;
        }
    }

    freeifaddrs(ifaddr);
}

int main() {
    get_ip_addresses();
    return 0;
}