Linux下获取WIFI状态信息(c语言)

编译时需要 -lwpa_client

wifi.h

#ifndef __WIFI_H__
#define __WIFI_H__int wifi_run_cmd(char *cmd, char *result, unsigned int *len);
/* ack:* RSSI=-77* LINKSPEED=48* NOISE=9999* FREQUENCY=2437*/
struct wifi_signal_poll_result_t {char ack[1024];int rssi;int linkspeed;int noise;int frequency;
};int wifi_run_cmd_signal_poll(struct wifi_signal_poll_result_t *result);/** ack:* bssid=64:3e:8c:37:9e:40* freq=2437* ssid=HD-WLAN* id=0* mode=station* pairwise_cipher=TKIP* group_cipher=TKIP* key_mgmt=WPA-PSK* wpa_state=COMPLETED/DISCONNECTED/SCANNING* ip_address=172.16.2.196* address=08:e9:f6:10:39:5e* uuid=0889e912-d3e3-52c6-8ad3-4d8a24294f7b*/
struct wifi_status_result_t {char ack[1024];char bssid[18];int freq;char ssid[128];int id;char mode[16];char pairwise_cipher[16];char group_cipher[16];char key_mgmt[16];char wpa_state[32];char ip_address[16];char address[18];char uuid[64];
};int wifi_run_cmd_status(struct wifi_status_result_t *result);
void wifi_config(char *ssid, char *psk);
int wifi_get_config(char *ssid, char *psk);
#endif

wifi.c

/** Copyright (C) 2021, 2021  huohongpeng* Author: huohongpeng <1045338804@qq.com>** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.* * Change logs:* Date        Author       Notes* 2021-10-21  huohongpeng   首次添加*/
#include <stddef.h>
#include <wpa_ctrl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "wifi.h"/** * 执行一条命令* @cmd: 需要执行命令* @result: 用于存储命令执行后返回的数据* @len: 传入result缓冲区大小, 传出命令执行后实际存储到result的数据大小* @return: 0-成功， 其他失败* 可以执行哪些命令参考: wpa_supplicant源码包中 wpa_supplicant-2.9/wpa_supplicant/wpa_cli.c: wpa_cli_commands[]* 常用的命令有:*  "STATUS"*  "STATUS-DRIVER"*  "STATUS-VERBOSE"*  "SIGNAL_POLL"*  ""*  */
int wifi_run_cmd(char *cmd, char *result, unsigned int *len)
{/** ctrl_path对应的文件路径必须在 /etc/wpa_supplicant.conf文件中的ctrl_interface指定的路径下的文件**   # ls -l /var/run/wpa_supplicant/wlan0 *   srwxrwx---    1 root     root             0 Oct 21 09:47 /var/run/wpa_supplicant/wlan0*/struct wpa_ctrl *wpa_ctrl = wpa_ctrl_open("/var/run/wpa_supplicant/wlan0");if (!wpa_ctrl) {printf("Err: wpa_ctrl_open()\n");return -1;}int ret = wpa_ctrl_request(wpa_ctrl, cmd, strlen(cmd), result, len, 0);result[*len] = 0;wpa_ctrl_close(wpa_ctrl);return ret;
}static int result_get(char *str, char *key, char *val, int val_len)
{char *s;if (!(s = strstr(str, key))) {return -1;}if (!(s = strchr(s, '='))) {return -1;}s++;while (*s != '\n' && *s != '\0' && val_len > 1) {*val++ = *s++;val_len--;}*val ='\0';return 0;
}/** 查询WIFI已连接AP的信号状态* @result: 查询结果* @ret: 0: 成功, -1: 失败*/
int wifi_run_cmd_signal_poll(struct wifi_signal_poll_result_t *result)
{int ret;char val[512];char *ack = result->ack;unsigned int len = sizeof(result->ack);char *cmd = "SIGNAL_POLL";memset(result, 0x00, sizeof(struct wifi_signal_poll_result_t));ret = wifi_run_cmd(cmd, ack, &len);if (ret < 0 || len == 0) {ret = -1;printf("Err: %s\n", cmd);goto ERROR;}if (strncmp(ack, "FAIL", 4) == 0) {printf("Err: %s (FAIL)\n", cmd);goto ERROR;}if (result_get(ack, "RSSI", val, sizeof(val)) == 0) {result->rssi = strtol(val, NULL, 10);}if (result_get(ack, "LINKSPEED", val, sizeof(val)) == 0) {result->linkspeed = strtol(val, NULL, 10);}if (result_get(ack, "FREQUENCY", val, sizeof(val)) == 0) {result->frequency = strtol(val, NULL, 10);}if (result_get(ack, "NOISE", val, sizeof(val)) == 0) {result->noise = strtol(val, NULL, 10);}ERROR:return ret;
}/** 查询WIFi当前工作状态信息* @result: 查询结果* @ret: 0: 查询成功, -1: 查询失败*/
int wifi_run_cmd_status(struct wifi_status_result_t *result)
{int ret;char val[512];char *ack = result->ack;unsigned int len = sizeof(result->ack);char *cmd = "STATUS";memset(result, 0x00, sizeof(struct wifi_status_result_t));ret = wifi_run_cmd(cmd, ack, &len);if (ret < 0 || len == 0) {ret = -1;printf("Err: %s\n", cmd);goto ERROR;}if (strncmp(ack, "FAIL", 4) == 0) {printf("Err: %s (FAIL)\n", cmd);goto ERROR;}result_get(ack, "bssid", result->bssid, sizeof(result->bssid));if (result_get(ack, "freq", val, sizeof(val)) == 0) {result->freq = strtol(val, NULL, 10);}result_get(ack, "ssid", result->ssid, sizeof(result->ssid));if (result_get(ack, "id", val, sizeof(val)) == 0) {result->id = strtol(val, NULL, 10);}result_get(ack, "mode", result->mode, sizeof(result->mode));result_get(ack, "pairwise_cipher", result->pairwise_cipher, sizeof(result->pairwise_cipher));result_get(ack, "group_cipher", result->group_cipher, sizeof(result->group_cipher));result_get(ack, "key_mgmt", result->key_mgmt, sizeof(result->key_mgmt));result_get(ack, "wpa_state", result->wpa_state, sizeof(result->wpa_state));result_get(ack, "ip_address", result->ip_address, sizeof(result->ip_address));result_get(ack, "address", result->address, sizeof(result->address));result_get(ack, "uuid", result->uuid, sizeof(result->uuid));ERROR:return ret;
}/** 修改wifi配置* @ssid: 需要连接ap的ssid* @psk: 需要连接ap的的密码* 注意: 此函数只修改配置不生效,如果生效需要,重启wifi*/
void wifi_set_config(char *ssid, char *psk)
{char buf[1024];int len;char *path = "/etc/wpa_supplicant.conf";int fd = open(path, O_CREAT | O_TRUNC | O_WRONLY);len = sprintf(buf, "ctrl_interface=/var/run/wpa_supplicant\nnetwork={\nssid=\"%s\"\npsk=\"%s\"\n}\n", ssid, psk);write(fd, buf, len);fsync(fd);close(fd);
}/** 获取wifi配置* @ssid: 需要连接ap的ssid* @psk: 需要连接ap的的密码* @ret: 0: 成功, -1*/
int wifi_get_config(char *ssid, char *psk)
{char buf[1024];char *path = "/etc/wpa_supplicant.conf";memset(buf, 0x00, sizeof(buf));int fd = open(path, O_RDONLY);if (fd < 0) {return -1;}read(fd, buf, 1024);close(fd);char val[512];if (result_get(buf, "ssid", val, sizeof(val)) < 0) {return -1;}strcpy(ssid, val + 1);ssid[strlen(ssid) - 1] = '\0';if (result_get(buf, "psk", val, sizeof(val)) < 0) {return -1;}strcpy(psk, val + 1);psk[strlen(psk) - 1] = '\0';return 0;
}void test_wifi_run_cmd_signal_poll(void)
{struct wifi_signal_poll_result_t result;wifi_run_cmd_signal_poll(&result);printf("%s: ack:\n%s", __FUNCTION__, result.ack);printf("%s: rssi: %d\n", __FUNCTION__, result.rssi);printf("%s: linkspeed: %d\n", __FUNCTION__, result.linkspeed);printf("%s frequency: %d\n", __FUNCTION__, result.frequency);printf("%s noise: %d\n", __FUNCTION__, result.noise);
}void test_wifi_run_cmd_status(void)
{struct wifi_status_result_t result;wifi_run_cmd_status(&result);printf("%s: ack:\n%s", __FUNCTION__, result.ack);printf("%s: bssid:%s\n", __FUNCTION__, result.bssid);printf("%s: freq:%d\n", __FUNCTION__, result.freq);printf("%s: ssid:%s\n", __FUNCTION__, result.ssid);printf("%s: id:%d\n", __FUNCTION__, result.id);printf("%s: mode:%s\n", __FUNCTION__, result.mode);printf("%s: pairwise_cipher:%s\n", __FUNCTION__, result.pairwise_cipher);printf("%s: group_cipher:%s\n", __FUNCTION__, result.group_cipher);printf("%s: key_mgmt:%s\n", __FUNCTION__, result.key_mgmt);printf("%s: wpa_state:%s\n", __FUNCTION__, result.wpa_state);printf("%s: ip_address:%s\n", __FUNCTION__, result.ip_address);printf("%s: address:%s\n", __FUNCTION__, result.address);printf("%s: uuid:%s\n", __FUNCTION__, result.uuid);
}void test_wifi(void)
{char ssid[128];char psk[128];if (wifi_get_config(ssid, psk) == 0) {printf("ssid: %s\n", ssid);printf("psk: %s\n", psk);}wifi_set_config("123456789", "123456789");sleep(5);test_wifi_run_cmd_signal_poll();test_wifi_run_cmd_status();
}

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