您好我已经编写了以下代码,它是项目的一部分。它用于查找当前关联网络的ESSID
。
但它有一个缺陷:它还会显示与我无关联的网络的ESSID
,即如果我尝试将自己与无线n / w关联,如果它不成功,即NO DHCP OFFERS ARE RECEIVED
,那么它也会显示我尝试过的ESSID
。
任何人都可以ioctl
拨打BSSID
来查找当前关联无线的 int main (void)
{
int errno;
struct iwreq wreq;
CStdString result = "None";
int sockfd;
char * id;
char ESSID[100];
memset(&wreq, 0, sizeof(struct iwreq));
if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
fprintf(stderr, "Cannot open socket \n");
fprintf(stderr, "errno = %d \n", errno);
fprintf(stderr, "Error description is : %s\n",strerror(errno));
return result ;
}
CLog::Log(LOGINFO,"Socket opened successfully");
FILE* fp = fopen("/proc/net/dev", "r");
if (!fp)
{
// TBD: Error
return result;
}
char* line = NULL;
size_t linel = 0;
int n;
char* p;
int linenum = 0;
while (getdelim(&line, &linel, '\n', fp) > 0)
{
// skip first two lines
if (linenum++ < 2)
continue;
p = line;
while (isspace(*p))
++p;
n = strcspn(p, ": \t");
p[n] = 0;
strcpy(wreq.ifr_name, p);
id = new char[IW_ESSID_MAX_SIZE+100];
wreq.u.essid.pointer = id;
wreq.u.essid.length = 100;
if ( ioctl(sockfd,SIOCGIWESSID, &wreq) == -1 ) {
continue;
}
else
{
strcpy(ESSID,id);
return ESSID;
}
free(id);
}
free(line);
fclose(fp);
return result;
}
吗?。在我看来,这是我可以标记黑白关联和非关联的唯一方式。
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