C++ code to find BSSID OF associated network - ubuntu-10.10

Question

Hello I've written the following code which is a part of a project. It is used to find the ESSID of the current associated network.
But it has a flaw: it also the displays the ESSID of the network with which I am not associated i.e. if I try to associate myself with a wireless n/w and if it is unsuccessful i.e. NO DHCP OFFERS ARE RECEIVED, then also it will display the that ESSID with which I have made my attempt.
Could anyone give me an ioctl call to find the BSSID of current associated wireless n/w?. In my opinion it is the only way with which I a can mark b/w associated and non associated.
CODE:-
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;
}