openssl: avoid config file load/race (see bitcoin d4b1d5a)

diff --git a/src/util.cpp b/src/util.cpp
index 73621d8..0f84938 100644 (file)
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -31,6 +31,7 @@ namespace boost {
 #include <boost/thread.hpp>
 #include <openssl/crypto.h>
 #include <openssl/rand.h>
+#include <openssl/conf.h>
 
 #ifdef WIN32
 #ifdef _MSC_VER
@@ -127,6 +128,13 @@ public:
             ppmutexOpenSSL[i] = new CCriticalSection();
         CRYPTO_set_locking_callback(locking_callback);
 
+        // OpenSSL can optionally load a config file which lists optional loadable modules and engines.
+        // We don't use them so we don't require the config. However some of our libs may call functions
+        // which attempt to load the config file, possibly resulting in an exit() or crash if it is missing
+        // or corrupt. Explicitly tell OpenSSL not to try to load the file. The result for our libs will be
+        // that the config appears to have been loaded and there are no modules/engines available.
+        OPENSSL_no_config();
+
 #ifdef WIN32
         // Seed random number generator with screen scrape and other hardware sources
         RAND_screen();