Adapt ENGINE_TABLE_DEBUG to the new generic trace API

Co-authored-by: Dr. Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8198)

3 files changed, 30 insertions, 46 deletions

diff --git a/crypto/engine/eng_int.h b/crypto/engine/eng_int.h
index 2a32411a16..7bb1d73680 100644
--- a/crypto/engine/eng_int.h
+++ b/crypto/engine/eng_int.h
@@ -11,6 +11,7 @@
 #ifndef HEADER_ENGINE_INT_H
 # define HEADER_ENGINE_INT_H
 
+# include <openssl/trace.h>
 # include "internal/cryptlib.h"
 # include "internal/engine.h"
 # include "internal/thread_once.h"
@@ -59,14 +60,6 @@ void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb);
 DEFINE_STACK_OF(ENGINE)
 
 /*
- * If this symbol is defined then engine_table_select(), the function that is
- * used by RSA, DSA (etc) code to select registered ENGINEs, cache defaults
- * and functional references (etc), will display debugging summaries to
- * stderr.
- */
-/* #define ENGINE_TABLE_DEBUG */
-
-/*
  * This represents an implementation table. Dependent code should instantiate
  * it as a (ENGINE_TABLE *) pointer value set initially to NULL.
  */
@@ -76,13 +69,10 @@ int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
                           int setdefault);
 void engine_table_unregister(ENGINE_TABLE **table, ENGINE *e);
 void engine_table_cleanup(ENGINE_TABLE **table);
-# ifndef ENGINE_TABLE_DEBUG
-ENGINE *engine_table_select(ENGINE_TABLE **table, int nid);
-# else
-ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
+ENGINE *engine_table_select_int(ENGINE_TABLE **table, int nid, const char *f,
                                 int l);
-#  define engine_table_select(t,n) engine_table_select_tmp(t,n,OPENSSL_FILE,OPENSSL_LINE)
-# endif
+# define engine_table_select(t,n)                               \
+    engine_table_select_int(t,n,OPENSSL_FILE,OPENSSL_LINE)
 typedef void (engine_table_doall_cb) (int nid, STACK_OF(ENGINE) *sk,
                                       ENGINE *def, void *arg);
 void engine_table_doall(ENGINE_TABLE *table, engine_table_doall_cb *cb,
diff --git a/crypto/engine/eng_table.c b/crypto/engine/eng_table.c
index b0e3ebbbc9..c3afa583d0 100644
--- a/crypto/engine/eng_table.c
+++ b/crypto/engine/eng_table.c
@@ -10,6 +10,7 @@
 #include "internal/cryptlib.h"
 #include <openssl/evp.h>
 #include <openssl/lhash.h>
+#include <openssl/trace.h>
 #include "eng_int.h"
 
 /* The type of the items in the table */
@@ -189,29 +190,24 @@ void engine_table_cleanup(ENGINE_TABLE **table)
 }
 
 /* return a functional reference for a given 'nid' */
-#ifndef ENGINE_TABLE_DEBUG
-ENGINE *engine_table_select(ENGINE_TABLE **table, int nid)
-#else
-ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
+ENGINE *engine_table_select_int(ENGINE_TABLE **table, int nid, const char *f,
                                 int l)
-#endif
 {
     ENGINE *ret = NULL;
     ENGINE_PILE tmplate, *fnd = NULL;
     int initres, loop = 0;
 
     if (!(*table)) {
-#ifdef ENGINE_TABLE_DEBUG
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, nothing "
-                "registered!\n", f, l, nid);
-#endif
+        OSSL_TRACE3(ENGINE_TABLE,
+                   "%s:%d, nid=%d, nothing registered!\n",
+                   f, l, nid);
         return NULL;
     }
     ERR_set_mark();
     CRYPTO_THREAD_write_lock(global_engine_lock);
     /*
      * Check again inside the lock otherwise we could race against cleanup
-     * operations. But don't worry about a fprintf(stderr).
+     * operations. But don't worry about a debug printout
      */
     if (!int_table_check(table, 0))
         goto end;
@@ -220,10 +216,9 @@ ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
     if (!fnd)
         goto end;
     if (fnd->funct && engine_unlocked_init(fnd->funct)) {
-#ifdef ENGINE_TABLE_DEBUG
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, using "
-                "ENGINE '%s' cached\n", f, l, nid, fnd->funct->id);
-#endif
+        OSSL_TRACE4(ENGINE_TABLE,
+                   "%s:%d, nid=%d, using ENGINE '%s' cached\n",
+                   f, l, nid, fnd->funct->id);
         ret = fnd->funct;
         goto end;
     }
@@ -234,10 +229,10 @@ ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
  trynext:
     ret = sk_ENGINE_value(fnd->sk, loop++);
     if (!ret) {
-#ifdef ENGINE_TABLE_DEBUG
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, no "
-                "registered implementations would initialise\n", f, l, nid);
-#endif
+        OSSL_TRACE3(ENGINE_TABLE,
+                    "%s:%d, nid=%d, "
+                    "no registered implementations would initialise\n",
+                    f, l, nid);
         goto end;
     }
     /* Try to initialise the ENGINE? */
@@ -252,15 +247,13 @@ ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
             if (fnd->funct)
                 engine_unlocked_finish(fnd->funct, 0);
             fnd->funct = ret;
-#ifdef ENGINE_TABLE_DEBUG
-            fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, "
-                    "setting default to '%s'\n", f, l, nid, ret->id);
-#endif
+            OSSL_TRACE4(ENGINE_TABLE,
+                        "%s:%d, nid=%d, setting default to '%s'\n",
+                        f, l, nid, ret->id);
         }
-#ifdef ENGINE_TABLE_DEBUG
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, using "
-                "newly initialised '%s'\n", f, l, nid, ret->id);
-#endif
+        OSSL_TRACE4(ENGINE_TABLE,
+                    "%s:%d, nid=%d, using newly initialised '%s'\n",
+                    f, l, nid, ret->id);
         goto end;
     }
     goto trynext;
@@ -271,14 +264,14 @@ ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
      */
     if (fnd)
         fnd->uptodate = 1;
-#ifdef ENGINE_TABLE_DEBUG
     if (ret)
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, caching "
-                "ENGINE '%s'\n", f, l, nid, ret->id);
+        OSSL_TRACE4(ENGINE_TABLE,
+                   "%s:%d, nid=%d, caching ENGINE '%s'\n",
+                   f, l, nid, ret->id);
     else
-        fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, caching "
-                "'no matching ENGINE'\n", f, l, nid);
-#endif
+        OSSL_TRACE3(ENGINE_TABLE,
+                    "%s:%d, nid=%d, caching 'no matching ENGINE'\n",
+                    f, l, nid);
     CRYPTO_THREAD_unlock(global_engine_lock);
     /*
      * Whatever happened, any failed init()s are not failures in this
diff --git a/crypto/trace.c b/crypto/trace.c
index c76eb5110e..38ef7ae232 100644
--- a/crypto/trace.c
+++ b/crypto/trace.c
@@ -124,6 +124,7 @@ static const struct trace_category_st trace_categories[] = {
     TRACE_CATEGORY_(TLS),
     TRACE_CATEGORY_(TLS_CIPHER),
     TRACE_CATEGORY_(ENGINE_CONF),
+    TRACE_CATEGORY_(ENGINE_TABLE),
 };
 
 const char *OSSL_trace_get_category_name(int num)