Upgrade unbound library

These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).

external/unbound/util/module.c

@@ -39,6 +39,7 @@
 
 #include "config.h"
 #include "util/module.h"
+#include "sldns/wire2str.h"
 
 const char* 
 strextstate(enum module_ext_state s)
@@ -69,3 +70,169 @@ strmodulevent(enum module_ev e)
 	}
 	return "bad_event_value";
 }
+
+int
+edns_known_options_init(struct module_env* env)
+{
+	env->edns_known_options_num = 0;
+	env->edns_known_options = (struct edns_known_option*)calloc(
+		MAX_KNOWN_EDNS_OPTS, sizeof(struct edns_known_option));
+	if(!env->edns_known_options) return 0;
+	return 1;
+}
+
+void
+edns_known_options_delete(struct module_env* env)
+{
+	free(env->edns_known_options);
+	env->edns_known_options = NULL;
+	env->edns_known_options_num = 0;
+}
+
+int
+edns_register_option(uint16_t opt_code, int bypass_cache_stage,
+	int no_aggregation, struct module_env* env)
+{
+	size_t i;
+	if(env->worker) {
+		log_err("invalid edns registration: "
+			"trying to register option after module init phase");
+		return 0;
+	}
+
+	/**
+	 * Checking if we are full first is faster but it does not provide
+	 * the option to change the flags when the array is full.
+	 * It only impacts unbound initialization, leave it for now.
+	 */
+	/* Check if the option is already registered. */
+	for(i=0; i<env->edns_known_options_num; i++)
+		if(env->edns_known_options[i].opt_code == opt_code)
+			break;
+	/* If it is not yet registered check if we have space to add a new one. */
+	if(i == env->edns_known_options_num) {
+		if(env->edns_known_options_num >= MAX_KNOWN_EDNS_OPTS) {
+			log_err("invalid edns registration: maximum options reached");
+			return 0;
+		}
+		env->edns_known_options_num++;
+	}
+	env->edns_known_options[i].opt_code = opt_code;
+	env->edns_known_options[i].bypass_cache_stage = bypass_cache_stage;
+	env->edns_known_options[i].no_aggregation = no_aggregation;
+	return 1;
+}
+
+int
+inplace_cb_register(void* cb, enum inplace_cb_list_type type, void* cbarg,
+	struct module_env* env, int id)
+{
+	struct inplace_cb* callback;
+	struct inplace_cb** prevp;
+	if(env->worker) {
+		log_err("invalid edns callback registration: "
+			"trying to register callback after module init phase");
+		return 0;
+	}
+
+	callback = (struct inplace_cb*)calloc(1, sizeof(*callback));
+	if(callback == NULL) {
+		log_err("out of memory during edns callback registration.");
+		return 0;
+	}
+	callback->id = id;
+	callback->next = NULL;
+	callback->cb = cb;
+	callback->cb_arg = cbarg;
+	
+	prevp = (struct inplace_cb**) &env->inplace_cb_lists[type];
+	/* append at end of list */
+	while(*prevp != NULL)
+		prevp = &((*prevp)->next);
+	*prevp = callback;
+	return 1;
+}
+
+void
+inplace_cb_delete(struct module_env* env, enum inplace_cb_list_type type,
+	int id)
+{
+	struct inplace_cb* temp = env->inplace_cb_lists[type];
+	struct inplace_cb* prev = NULL;
+
+	while(temp) {
+		if(temp->id == id) {
+			if(!prev) {
+				env->inplace_cb_lists[type] = temp->next;
+				free(temp);
+				temp = env->inplace_cb_lists[type];
+			}
+			else {
+				prev->next = temp->next;
+				free(temp);
+				temp = prev->next;
+			}
+		}
+		else {
+			prev = temp;
+			temp = temp->next;
+		}
+	}
+}
+
+struct edns_known_option*
+edns_option_is_known(uint16_t opt_code, struct module_env* env)
+{
+	size_t i;
+	for(i=0; i<env->edns_known_options_num; i++)
+		if(env->edns_known_options[i].opt_code == opt_code)
+			return env->edns_known_options + i;
+	return NULL;
+}
+
+int
+edns_bypass_cache_stage(struct edns_option* list, struct module_env* env)
+{
+	size_t i;
+	for(; list; list=list->next)
+		for(i=0; i<env->edns_known_options_num; i++)
+			if(env->edns_known_options[i].opt_code == list->opt_code &&
+				env->edns_known_options[i].bypass_cache_stage == 1)
+					return 1;
+	return 0;
+}
+
+int
+unique_mesh_state(struct edns_option* list, struct module_env* env)
+{
+	size_t i;
+	if(env->unique_mesh)
+		return 1;
+	for(; list; list=list->next)
+		for(i=0; i<env->edns_known_options_num; i++)
+			if(env->edns_known_options[i].opt_code == list->opt_code &&
+				env->edns_known_options[i].no_aggregation == 1)
+					return 1;
+	return 0;
+}
+
+void
+log_edns_known_options(enum verbosity_value level, struct module_env* env)
+{
+	size_t i;
+	char str[32], *s;
+	size_t slen;
+	if(env->edns_known_options_num > 0 && verbosity >= level) {
+		verbose(level, "EDNS known options:");
+		verbose(level, "  Code:    Bypass_cache_stage: Aggregate_mesh:");
+		for(i=0; i<env->edns_known_options_num; i++) {
+			s = str;
+			slen = sizeof(str);
+			(void)sldns_wire2str_edns_option_code_print(&s, &slen,
+				env->edns_known_options[i].opt_code);
+			verbose(level, "  %-8.8s %-19s %-15s", str,
+				env->edns_known_options[i].bypass_cache_stage?"YES":"NO",
+				env->edns_known_options[i].no_aggregation?"NO":"YES");
+		}
+	}
+}