c语言获取ip、mac、port并用字符串装起来

获取IP、MAC、Port需要使用不同的系统调用和方法，下面是一个简单的示例程序，可以获取本机IP、MAC和随机的Port，并将它们存储在字符串中：

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

char* get_local_ip() {
    int fd;
    struct ifreq ifr;
    char* ip = (char*)malloc(16);
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    ifr.ifr_addr.sa_family = AF_INET;
    strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
    ioctl(fd, SIOCGIFADDR, &ifr);
    close(fd);
    strcpy(ip, inet_ntoa(((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr));
    return ip;
}

char* get_local_mac() {
    int fd;
    struct ifreq ifr;
    unsigned char* mac = (unsigned char*)malloc(18);
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    ifr.ifr_addr.sa_family = AF_INET;
    strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
    ioctl(fd, SIOCGIFHWADDR, &ifr);
    close(fd);
    sprintf(mac, "%02X:%02X:%02X:%02X:%02X:%02X",
            (unsigned char)ifr.ifr_hwaddr.sa_data[0],
            (unsigned char)ifr.ifr_hwaddr.sa_data[1],
            (unsigned char)ifr.ifr_hwaddr.sa_data[2],
            (unsigned char)ifr.ifr_hwaddr.sa_data[3],
            (unsigned char)ifr.ifr_hwaddr.sa_data[4],
            (unsigned char)ifr.ifr_hwaddr.sa_data[5]);
    return mac;
}

int get_random_port() {
    int port = rand() % 65536;
    while (port <= 1024) {
        port = rand() % 65536;
    }
    return port;
}

int main() {
    char* ip = get_local_ip();
    char* mac = get_local_mac();
    int port = get_random_port();
    char* str = (char*)malloc(50);
    sprintf(str, "IP:%s, MAC:%s, Port:%d", ip, mac, port);
    printf("%s\n", str);
    free(ip);
    free(mac);
    free(str);
    return 0;
}

注意，这个程序只是一个简单的示例，仅用于展示获取IP、MAC和Port的方法，并不是完整的实现。实际应用中，需要根据具体需求进行修改和完善。