From 4e8b6fae827ba0898e9e41eb1fa7c2d03cd74f8d Mon Sep 17 00:00:00 2001

From: Petr Mensik <pemensik@redhat.com>

Date: Fri, 6 May 2022 16:36:39 +0200

Subject: [PATCH] Rework ABI breaking change to compatible way

Upstream commit 749d1b9ebc6fcb79824afd0471a1cfc12ca861b1 introduced

was_ratelimited variable to every async callback. Such change led to ABI

break and increase of soname of libunbound.

Use rcode to pass that boolean inside rcode variable. Allows keeping

original callback prototype, but does not lose data. Extra integer bit

operations should be very small price. Much better than ABI break.

Make current version compatible back to .2 version.

---

 unbound-1.16.0/configure.ac               |  2 +-

 unbound-1.16.0/daemon/worker.c            |  6 ++--

 unbound-1.16.0/libunbound/libworker.c     | 34 +++++++++++++++--------

 unbound-1.16.0/libunbound/unbound-event.h |  3 +-

 unbound-1.16.0/libunbound/unbound.h       | 13 +++++----

 unbound-1.16.0/libunbound/worker.h        |  6 ++--

 unbound-1.16.0/services/authzone.c        | 11 ++++----

 unbound-1.16.0/services/authzone.h        |  9 ++----

 unbound-1.16.0/services/mesh.c            | 17 ++++++++----

 unbound-1.16.0/services/mesh.h            |  9 +++++-

 unbound-1.16.0/smallapp/worker_cb.c       |  6 ++--

 unbound-1.16.0/validator/autotrust.c      |  2 +-

 unbound-1.16.0/validator/autotrust.h      |  2 +-

 13 files changed, 72 insertions(+), 48 deletions(-)

diff --git a/unbound-1.16.0/configure.ac b/unbound-1.16.0/configure.ac

index 1453b3a..03d258e 100644

--- a/unbound-1.16.0/configure.ac

+++ b/unbound-1.16.0/configure.ac

@@ -19,7 +19,7 @@ AC_SUBST(UNBOUND_VERSION_MICRO, [VERSION_MICRO])

 LIBUNBOUND_CURRENT=9

 LIBUNBOUND_REVISION=16

-LIBUNBOUND_AGE=1

+LIBUNBOUND_AGE=7

 # 1.0.0 had 0:12:0

 # 1.0.1 had 0:13:0

 # 1.0.2 had 0:14:0

diff --git a/unbound-1.16.0/daemon/worker.c b/unbound-1.16.0/daemon/worker.c

index bf8c5d6..4553475 100644

--- a/unbound-1.16.0/daemon/worker.c

+++ b/unbound-1.16.0/daemon/worker.c

@@ -2268,21 +2268,21 @@ void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),

 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),

 	sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),

 	sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),

 	sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

diff --git a/unbound-1.16.0/libunbound/libworker.c b/unbound-1.16.0/libunbound/libworker.c

index 11bf5f9..6895119 100644

--- a/unbound-1.16.0/libunbound/libworker.c

+++ b/unbound-1.16.0/libunbound/libworker.c

@@ -549,9 +549,10 @@ libworker_enter_result(struct ub_result* res, sldns_buffer* buf,

 /** fillup fg results */

 static void

 libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf, 

-	enum sec_status s, char* why_bogus, int was_ratelimited)

+	enum sec_status s, char* why_bogus)

 {

-	q->res->was_ratelimited = was_ratelimited;

+	q->res->was_ratelimited = RCODE_IS_RATELIMITED(rcode);

+	rcode = RCODE_NOT_RATELIMITED(rcode);

 	if(why_bogus)

 		q->res->why_bogus = strdup(why_bogus);

 	if(rcode != 0) {

@@ -575,13 +576,13 @@ libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,

 void

 libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,

-	char* why_bogus, int was_ratelimited)

+	char* why_bogus)

 {

 	struct ctx_query* q = (struct ctx_query*)arg;

 	/* fg query is done; exit comm base */

 	comm_base_exit(q->w->base);

-	libworker_fillup_fg(q, rcode, buf, s, why_bogus, was_ratelimited);

+	libworker_fillup_fg(q, rcode, buf, s, why_bogus);

 }

 /** setup qinfo and edns */

@@ -634,7 +635,7 @@ int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)

 		NULL, 0, NULL, 0, NULL)) {

 		regional_free_all(w->env->scratch);

 		libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 

-			w->back->udp_buff, sec_status_insecure, NULL, 0);

+			w->back->udp_buff, sec_status_insecure, NULL);

 		libworker_delete(w);

 		free(qinfo.qname);

 		return UB_NOERROR;

@@ -643,7 +644,7 @@ int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)

 		w->env, &qinfo, &edns, NULL, w->back->udp_buff, w->env->scratch)) {

 		regional_free_all(w->env->scratch);

 		libworker_fillup_fg(q, LDNS_RCODE_NOERROR, 

-			w->back->udp_buff, sec_status_insecure, NULL, 0);

+			w->back->udp_buff, sec_status_insecure, NULL);

 		libworker_delete(w);

 		free(qinfo.qname);

 		return UB_NOERROR;

@@ -665,7 +666,7 @@ int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)

 void

 libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,

-	enum sec_status s, char* why_bogus, int was_ratelimited)

+	enum sec_status s, char* why_bogus)

 {

 	struct ctx_query* q = (struct ctx_query*)arg;

 	ub_event_callback_type cb = q->cb_event;

@@ -688,7 +689,7 @@ libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,

 		else if(s == sec_status_secure)

 			sec = 2;

 		(*cb)(cb_arg, rcode, (buf?(void*)sldns_buffer_begin(buf):NULL),

-			(buf?(int)sldns_buffer_limit(buf):0), sec, why_bogus, was_ratelimited);

+			(buf?(int)sldns_buffer_limit(buf):0), sec, why_bogus);

 	}

 }

@@ -715,7 +716,7 @@ int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,

 		regional_free_all(w->env->scratch);

 		free(qinfo.qname);

 		libworker_event_done_cb(q, LDNS_RCODE_NOERROR,

-			w->back->udp_buff, sec_status_insecure, NULL, 0);

+			w->back->udp_buff, sec_status_insecure, NULL);

 		return UB_NOERROR;

 	}

 	if(ctx->env->auth_zones && auth_zones_answer(ctx->env->auth_zones,

@@ -723,7 +724,7 @@ int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,

 		regional_free_all(w->env->scratch);

 		free(qinfo.qname);

 		libworker_event_done_cb(q, LDNS_RCODE_NOERROR,

-			w->back->udp_buff, sec_status_insecure, NULL, 0);

+			w->back->udp_buff, sec_status_insecure, NULL);

 		return UB_NOERROR;

 	}

 	/* process new query */

@@ -788,12 +789,23 @@ add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,

 	}

 }

+

+void

+libworker_bg_done_cb_compat(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,

+	char* why_bogus)

+{

+	rcode = RCODE_NOT_RATELIMITED(rcode);

+	libworker_bg_done_cb(arg, rcode, buf, s, why_bogus);

+}

+

 void

 libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,

-	char* why_bogus, int was_ratelimited)

+	char* why_bogus)

 {

+	int was_ratelimited = RCODE_IS_RATELIMITED(rcode);

 	struct ctx_query* q = (struct ctx_query*)arg;

+	rcode = RCODE_NOT_RATELIMITED(rcode);

 	if(q->cancelled || q->w->back->want_to_quit) {

 		if(q->w->is_bg_thread) {

 			/* delete it now */

diff --git a/unbound-1.16.0/libunbound/unbound-event.h b/unbound-1.16.0/libunbound/unbound-event.h

index a5d5c03..70aa4c8 100644

--- a/unbound-1.16.0/libunbound/unbound-event.h

+++ b/unbound-1.16.0/libunbound/unbound-event.h

@@ -170,7 +170,8 @@ struct ub_event {

 	struct ub_event_vmt* vmt;

 };

-typedef void (*ub_event_callback_type)(void*, int, void*, int, int, char*, int);

+/* Uses define LDNS_RCODE_RATELIMITED from services/mesh.h */

+typedef void (*ub_event_callback_type)(void*, int, void*, int, int, char*);

 /**

  * Create a resolving and validation context.

diff --git a/unbound-1.16.0/libunbound/unbound.h b/unbound-1.16.0/libunbound/unbound.h

index ee85587..c822d3f 100644

--- a/unbound-1.16.0/libunbound/unbound.h

+++ b/unbound-1.16.0/libunbound/unbound.h

@@ -203,18 +203,19 @@ struct ub_result {

 	 */

 	char* why_bogus;

+	/**

+	 * TTL for the result, in seconds.  If the security is bogus, then

+	 * you also cannot trust this value.

+	 */

+	int ttl;

+

 	/**

 	 * If the query or one of its subqueries was ratelimited.  Useful if

 	 * ratelimiting is enabled and answer to the client is SERVFAIL as a

 	 * result.

+	 * RHEL8 Change, moved after ttl.

 	 */

 	int was_ratelimited;

-

-	/**

-	 * TTL for the result, in seconds.  If the security is bogus, then

-	 * you also cannot trust this value.

-	 */

-	int ttl;

 };

 /**

diff --git a/unbound-1.16.0/libunbound/worker.h b/unbound-1.16.0/libunbound/worker.h

index 0fa5bfa..8b64b4d 100644

--- a/unbound-1.16.0/libunbound/worker.h

+++ b/unbound-1.16.0/libunbound/worker.h

@@ -90,15 +90,15 @@ void libworker_handle_control_cmd(struct tube* tube, uint8_t* msg, size_t len,

 /** mesh callback with fg results */

 void libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, 

-	enum sec_status s, char* why_bogus, int was_ratelimited);

+	enum sec_status s, char* why_bogus);

 /** mesh callback with bg results */

 void libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, 

-	enum sec_status s, char* why_bogus, int was_ratelimited);

+	enum sec_status s, char* why_bogus);

 /** mesh callback with event results */

 void libworker_event_done_cb(void* arg, int rcode, struct sldns_buffer* buf, 

-	enum sec_status s, char* why_bogus, int was_ratelimited);

+	enum sec_status s, char* why_bogus);

 /**

  * Worker signal handler function. User argument is the worker itself.

diff --git a/unbound-1.16.0/services/authzone.c b/unbound-1.16.0/services/authzone.c

index 02fb621..4ba8be8 100644

--- a/unbound-1.16.0/services/authzone.c

+++ b/unbound-1.16.0/services/authzone.c

@@ -5654,8 +5654,7 @@ xfr_master_add_addrs(struct auth_master* m, struct ub_packed_rrset_key* rrset,

 /** callback for task_transfer lookup of host name, of A or AAAA */

 void auth_xfer_transfer_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

-	enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),

-	int ATTR_UNUSED(was_ratelimited))

+	enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus))

 {

 	struct auth_xfer* xfr = (struct auth_xfer*)arg;

 	struct module_env* env;

@@ -5667,6 +5666,7 @@ void auth_xfer_transfer_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

 		return; /* stop on quit */

 	}

+	rcode = RCODE_NOT_RATELIMITED(rcode);

 	/* process result */

 	if(rcode == LDNS_RCODE_NOERROR) {

 		uint16_t wanted_qtype = LDNS_RR_TYPE_A;

@@ -6715,8 +6715,7 @@ xfr_probe_send_or_end(struct auth_xfer* xfr, struct module_env* env)

 /** callback for task_probe lookup of host name, of A or AAAA */

 void auth_xfer_probe_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

-	enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),

-	int ATTR_UNUSED(was_ratelimited))

+	enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus))

 {

 	struct auth_xfer* xfr = (struct auth_xfer*)arg;

 	struct module_env* env;

@@ -6728,6 +6727,7 @@ void auth_xfer_probe_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

 		return; /* stop on quit */

 	}

+	rcode = RCODE_NOT_RATELIMITED(rcode);

 	/* process result */

 	if(rcode == LDNS_RCODE_NOERROR) {

 		uint16_t wanted_qtype = LDNS_RR_TYPE_A;

@@ -8211,7 +8211,7 @@ auth_zone_verify_zonemd_key_with_ds(struct auth_zone* z,

 /** callback for ZONEMD lookup of DNSKEY */

 void auth_zonemd_dnskey_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

-	enum sec_status sec, char* why_bogus, int ATTR_UNUSED(was_ratelimited))

+	enum sec_status sec, char* why_bogus)

 {

 	struct auth_zone* z = (struct auth_zone*)arg;

 	struct module_env* env;

@@ -8233,6 +8233,7 @@ void auth_zonemd_dnskey_lookup_callback(void* arg, int rcode, sldns_buffer* buf,

 	if(z->zonemd_callback_qtype == LDNS_RR_TYPE_DS)

 		typestr = "DS";

 	downprot = env->cfg->harden_algo_downgrade;

+	rcode = RCODE_NOT_RATELIMITED(rcode);

 	/* process result */

 	if(sec == sec_status_bogus) {

diff --git a/unbound-1.16.0/services/authzone.h b/unbound-1.16.0/services/authzone.h

index 07614ed..b339fc1 100644

--- a/unbound-1.16.0/services/authzone.h

+++ b/unbound-1.16.0/services/authzone.h

@@ -690,12 +690,10 @@ void auth_xfer_probe_timer_callback(void* arg);

 void auth_xfer_transfer_timer_callback(void* arg);

 /** mesh callback for task_probe on lookup of host names */

 void auth_xfer_probe_lookup_callback(void* arg, int rcode,

-	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,

-	int was_ratelimited);

+	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus);

 /** mesh callback for task_transfer on lookup of host names */

 void auth_xfer_transfer_lookup_callback(void* arg, int rcode,

-	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,

-	int was_ratelimited);

+	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus);

 /*

  * Compares two 32-bit serial numbers as defined in RFC1982.  Returns

@@ -774,8 +772,7 @@ void auth_zone_verify_zonemd(struct auth_zone* z, struct module_env* env,

 /** mesh callback for zonemd on lookup of dnskey */

 void auth_zonemd_dnskey_lookup_callback(void* arg, int rcode,

-	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,

-	int was_ratelimited);

+	struct sldns_buffer* buf, enum sec_status sec, char* why_bogus);

 /**

  * Check the ZONEMD records that need online DNSSEC chain lookups,

diff --git a/unbound-1.16.0/services/mesh.c b/unbound-1.16.0/services/mesh.c

index fbaa966..c66b01f 100644

--- a/unbound-1.16.0/services/mesh.c

+++ b/unbound-1.16.0/services/mesh.c

@@ -63,6 +63,7 @@

 #include "util/data/dname.h"

 #include "respip/respip.h"

 #include "services/listen_dnsport.h"

+#include "libunbound/unbound-event.h"

 #ifdef CLIENT_SUBNET

 #include "edns-subnet/subnetmod.h"

@@ -1010,7 +1011,7 @@ mesh_state_cleanup(struct mesh_state* mstate)

 			mstate->cb_list = cb->next;

 			fptr_ok(fptr_whitelist_mesh_cb(cb->cb));

 			(*cb->cb)(cb->cb_arg, LDNS_RCODE_SERVFAIL, NULL,

-				sec_status_unchecked, NULL, 0);

+				sec_status_unchecked, NULL);

 			log_assert(mesh->num_reply_addrs > 0);

 			mesh->num_reply_addrs--;

 		}

@@ -1266,8 +1267,9 @@ mesh_do_callback(struct mesh_state* m, int rcode, struct reply_info* rep,

 					r->edns.opt_list_inplace_cb_out = NULL;

 		}

 		fptr_ok(fptr_whitelist_mesh_cb(r->cb));

-		(*r->cb)(r->cb_arg, rcode, r->buf, sec_status_unchecked, NULL,

-			was_ratelimited);

+		if (was_ratelimited)

+			rcode |= LDNS_RCODE_RATELIMITED;

+		(*r->cb)(r->cb_arg, rcode, r->buf, sec_status_unchecked, NULL);

 	} else {

 		size_t udp_size = r->edns.udp_size;

 		sldns_buffer_clear(r->buf);

@@ -1285,11 +1287,14 @@ mesh_do_callback(struct mesh_state* m, int rcode, struct reply_info* rep,

 		{

 			fptr_ok(fptr_whitelist_mesh_cb(r->cb));

 			(*r->cb)(r->cb_arg, LDNS_RCODE_SERVFAIL, r->buf,

-				sec_status_unchecked, NULL, 0);

+				sec_status_unchecked, NULL);

 		} else {

 			fptr_ok(fptr_whitelist_mesh_cb(r->cb));

-			(*r->cb)(r->cb_arg, LDNS_RCODE_NOERROR, r->buf,

-				rep->security, reason, was_ratelimited);

+			rcode = LDNS_RCODE_NOERROR;

+			if (was_ratelimited)

+				rcode |= LDNS_RCODE_RATELIMITED;

+			(*r->cb)(r->cb_arg, rcode, r->buf,

+				rep->security, reason);

 		}

 	}

 	free(reason);

diff --git a/unbound-1.16.0/services/mesh.h b/unbound-1.16.0/services/mesh.h

index 3be9b63..5050d6c 100644

--- a/unbound-1.16.0/services/mesh.h

+++ b/unbound-1.16.0/services/mesh.h

@@ -234,13 +234,20 @@ struct mesh_reply {

 	struct http2_stream* h2_stream;

 };

+/* RHEL 8 compatibility layer.

+ * Special rcode to send was_ratelimited to callback without adding

+ * extra parameter. It is ORed to the rcode parameter of the callback. */

+#define LDNS_RCODE_RATELIMITED 0x100

+#define RCODE_IS_RATELIMITED(rcode) ((rcode & LDNS_RCODE_RATELIMITED) != 0)

+#define RCODE_NOT_RATELIMITED(rcode) (rcode & ~LDNS_RCODE_RATELIMITED)

+

 /** 

  * Mesh result callback func.

  * called as func(cb_arg, rcode, buffer_with_reply, security, why_bogus,

  *		was_ratelimited);

  */

 typedef void (*mesh_cb_func_type)(void* cb_arg, int rcode, struct sldns_buffer*,

-	enum sec_status, char* why_bogus, int was_ratelimited);

+	enum sec_status, char* why_bogus);

 /**

  * Callback to result routine

diff --git a/unbound-1.16.0/smallapp/worker_cb.c b/unbound-1.16.0/smallapp/worker_cb.c

index c689817..c7b1653 100644

--- a/unbound-1.16.0/smallapp/worker_cb.c

+++ b/unbound-1.16.0/smallapp/worker_cb.c

@@ -159,21 +159,21 @@ void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),

 void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 

 	struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

 void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 

 	struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

 void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode), 

 	struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	log_assert(0);

 }

diff --git a/unbound-1.16.0/validator/autotrust.c b/unbound-1.16.0/validator/autotrust.c

index 3cdf9ce..40b3e35 100644

--- a/unbound-1.16.0/validator/autotrust.c

+++ b/unbound-1.16.0/validator/autotrust.c

@@ -2331,7 +2331,7 @@ autr_debug_print(struct val_anchors* anchors)

 void probe_answer_cb(void* arg, int ATTR_UNUSED(rcode), 

 	sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(sec),

-	char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))

+	char* ATTR_UNUSED(why_bogus))

 {

 	/* retry was set before the query was done,

 	 * re-querytime is set when query succeeded, but that may not

diff --git a/unbound-1.16.0/validator/autotrust.h b/unbound-1.16.0/validator/autotrust.h

index 057f2b6..c549798 100644

--- a/unbound-1.16.0/validator/autotrust.h

+++ b/unbound-1.16.0/validator/autotrust.h

@@ -206,6 +206,6 @@ void autr_debug_print(struct val_anchors* anchors);

 /** callback for query answer to 5011 probe */

 void probe_answer_cb(void* arg, int rcode, struct sldns_buffer* buf, 

-	enum sec_status sec, char* errinf, int was_ratelimited);

+	enum sec_status sec, char* errinf);

 #endif /* VALIDATOR_AUTOTRUST_H */

-- 

2.35.3