dhcp6c: fix cast warnings

auth.c

@@ -119,7 +119,7 @@ dhcp6_validate_key(struct keyinfo *key)
 }
 
 int
-dhcp6_calc_mac(char *buf, size_t len, int proto __attribute__((__unused__)), int alg,
+dhcp6_calc_mac(unsigned char *buf, size_t len, int proto __attribute__((__unused__)), int alg,
     size_t off, struct keyinfo *key)
 {
 	hmacmd5_t ctx;
@@ -148,7 +148,7 @@ dhcp6_calc_mac(char *buf, size_t len, int proto __attribute__((__unused__)), int
 }
 
 int
-dhcp6_verify_mac(char *buf, ssize_t len, int proto __attribute__((__unused__)),
+dhcp6_verify_mac(unsigned char *buf, ssize_t len, int proto __attribute__((__unused__)),
     int alg, size_t off, struct keyinfo *key)
 {
 	hmacmd5_t ctx;

auth.h

@@ -42,15 +42,15 @@ struct keyinfo {
 	char *realm;		/* DHCP realm */
 	size_t realmlen;	/* length of realm */
 	u_int32_t keyid;	/* key ID */
-	char *secret;		/* binary key */
+	unsigned char *secret;	/* binary key */
 	size_t secretlen;	/* length of the key */
 	time_t expire;		/* expiration time (0 means forever) */
 };
 
 int dhcp6_validate_key(struct keyinfo *);
-int dhcp6_calc_mac(char *, size_t, int, int, size_t,
+int dhcp6_calc_mac(unsigned char *, size_t, int, int, size_t,
     struct keyinfo *);
-int dhcp6_verify_mac(char *, ssize_t, int, int, size_t,
+int dhcp6_verify_mac(unsigned char *, ssize_t, int, int, size_t,
     struct keyinfo *);
 
 #endif

config.c

@@ -177,7 +177,7 @@ void list_cfl (char *tag,struct cf_namelist *head)
 					}
 					break;
 				case DECL_SCRIPT:
-					printf("script %s\n", cfl->ptr);
+					printf("script %s\n", (char *)cfl->ptr);
 					break;
 				default:
 					printf("Unknown option type %i\n", cfl->type);

dhcp6c.c

@@ -1141,7 +1141,7 @@ client6_send(struct dhcp6_event *ev)
 			if (ev->authparam->key == NULL)
 				break;
 
-			if (dhcp6_calc_mac((char *)dh6, len,
+			if (dhcp6_calc_mac((unsigned char *)dh6, len,
 			    optinfo.authproto, optinfo.authalgorithm,
 			    optinfo.delayedauth_offset + sizeof(*dh6),
 			    ev->authparam->key)) {
@@ -1873,7 +1873,7 @@ process_auth(struct authparam *authparam, struct dhcp6 *dh6,
 		}
 
 		/* validate MAC */
-		if (dhcp6_verify_mac((char *)dh6, len, optinfo->authproto,
+		if (dhcp6_verify_mac((unsigned char *)dh6, len, optinfo->authproto,
 		    optinfo->authalgorithm,
 		    optinfo->delayedauth_offset + sizeof(*dh6), key) == 0) {
 			d_printf(LOG_DEBUG, FNAME, "message authentication "