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ip/dhcp6d: handle internationalized domain names

--- a/sys/src/cmd/ip/dhcp6d.c

+++ b/sys/src/cmd/ip/dhcp6d.c

@@ -562,6 +562,7 @@

 static int

 odomainlist(uchar *w, int n, Otab *o, Req *q)

 {

+	char val[256];

 	Ndbtuple *t;

 	int l, r;

 	char *s;

@@ -570,7 +571,9 @@

 	for(t = q->t; t != nil; t = t->entry){

 		if(strcmp(t->attr, o->q[0]) != 0)

 			continue;

-		for(s = t->val; *s != 0; s++){

+		if(utf2idn(t->val, val, sizeof(val)) == nil)

+			continue;

+		for(s = val; *s != 0; s++){

 			for(l = 0; *s != 0 && *s != '.'; l++)

 				s++;

 			if(r+1+l > n)

@@ -578,6 +581,8 @@

 			w[r++] = l;

 			memmove(w+r, s-l, l);

 			r += l;

+			if(*s != '.')

+				break;

 		}

 		if(r >= n)

 			return -1;

-- 

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