linux c 搜索WiFi

您好！要在 Linux C 中搜索WiFi，您可以使用以下步骤：

1. 包含必要的头文件：

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

2. 打开无线网络接口：

int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
    perror("socket");
    exit(1);
}

struct iwreq req;
strcpy(req.ifr_name, "wlan0"); // 将 "wlan0" 替换为您的无线接口名称
if (ioctl(sock, SIOCGIWNAME, &req) == -1) {
    perror("ioctl");
    close(sock);
    exit(1);
}

3. 获取扫描结果：

struct iw_scan_req scan_req;
memset(&scan_req, 0, sizeof(scan_req));
strcpy(scan_req.ifr_name, "wlan0"); // 将 "wlan0" 替换为您的无线接口名称

struct iw_point scan_result;
char scan_buffer[4096];
memset(scan_buffer, 0, sizeof(scan_buffer));
scan_result.pointer = (__u32)scan_buffer;
scan_result.length = sizeof(scan_buffer);

scan_req.scan_type = IW_SCAN_TYPE_PASSIVE; // 可根据需要更改扫描类型

scan_req.u.data.pointer = &scan_result;
scan_req.u.data.length = sizeof(scan_buffer);
if (ioctl(sock, SIOCSIWSCAN, &scan_req) == -1) {
    perror("ioctl");
    close(sock);
    exit(1);
}

4. 解析扫描结果：

struct iw_event iwe;
char* current_event = scan_buffer;

while (current_event < (scan_buffer + scan_result.length)) {
    memcpy(&iwe, current_event, sizeof(iwe));
    
    if (iwe.cmd == SIOCGIWAP) {
        struct sockaddr* sa = (struct sockaddr*) &iwe.u.ap_addr;
        char ap_address[INET_ADDRSTRLEN];
        if (inet_ntop(AF_INET, &(sa->sa_data[2]), ap_address, sizeof(ap_address)) != NULL) {
            printf("WiFi AP: %s\n", ap_address);
        }
    }
    
    current_event += iwe.len;
}

请注意，上述代码中的 "wlan0" 应替换为您的无线接口名称，您可以通过 `ifconfig` 命令在终端上找到它。

希望这可以帮助到您！如有任何问题，请随时提问。