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wifi: add list of setup encryption key ciphers and lengths into ifstats file

it is usefull to see what encryption keys have been
estabished by aux/wpa.

--- a/sys/src/9/pc/wifi.c

+++ b/sys/src/9/pc/wifi.c

@@ -660,6 +660,7 @@

 	char *s, *p, *e;

 	Wnode *wn;

 	long now;

+	int i;

 	p = s = smalloc(4096);

 	e = s + 4096;

@@ -670,9 +671,16 @@

 	wn = wifi->bss;

 	if(wn != nil){

 		p = seprint(p, e, "bssid: %E\n", wn->bssid);

-		if(wn->brsnelen > 0){

-			int i;

+		/* only print key ciphers and key length */

+		for(i = 0; i<nelem(wn->rxkey); i++)

+			p = seprint(p, e, "rxkey%d: %s:[%d]\n", i,

+				ciphers[wn->rxkey[i].cipher], wn->rxkey[i].len);

+		for(i = 0; i<nelem(wn->txkey); i++)

+			p = seprint(p, e, "txkey%d: %s:[%d]\n", i,

+				ciphers[wn->txkey[i].cipher], wn->txkey[i].len);

+

+		if(wn->brsnelen > 0){

 			p = seprint(p, e, "brsne: ");

 			for(i=0; i<wn->brsnelen; i++)

 				p = seprint(p, e, "%.2X", wn->brsne[i]);

-- 

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