linux+c客户端ip

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ifaddrs.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/if_link.h>

void get_local_ip() {
    struct ifaddrs *ifaddr, *ifa;
    char ip[INET6_ADDRSTRLEN];

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

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

        int family = ifa->ifa_addr->sa_family;

        if (family == AF_INET || family == AF_INET6) {
            void *addr_ptr;
            char *type;

            if (family == AF_INET) {
                addr_ptr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
                type = "IPv4";
            } else {
                addr_ptr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
                type = "IPv6";
            }

            inet_ntop(family, addr_ptr, ip, sizeof(ip));
            printf("%s: %s\n", type, ip);
        }
    }

    freeifaddrs(ifaddr);
}

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

void get_local_ip_via_socket() {
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        return;
    }

    struct sockaddr_in sin;
    socklen_t len = sizeof(sin);

    if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1) {
        perror("getsockname");
        close(sockfd);
        return;
    }

    char ip[INET_ADDRSTRLEN];
    inet_ntop(AF_INET, &sin.sin_addr, ip, sizeof(ip));
    printf("Local IP: %s\n", ip);

    close(sockfd);
}

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