fix ERR_add_error_vdata() for use with multiple args/calls
[openssl.git] / crypto / info.c
index 5a929dd..c5eb1fc 100644 (file)
 #include <openssl/crypto.h>
 #include "internal/dso_conf.h"
 #include "e_os.h"
+#include "buildinf.h"
+#include "internal/thread_once.h"
+
+static char *seed_sources = NULL;
+static CRYPTO_ONCE init_info = CRYPTO_ONCE_STATIC_INIT;
+
+DEFINE_RUN_ONCE_STATIC(init_info_strings)
+{
+    {
+        static char seeds[512] = "";
+
+#define add_seeds_string(str)                                           \
+        do {                                                            \
+            if (seeds[0] != '\0')                                       \
+                OPENSSL_strlcat(seeds, " ", sizeof(seeds));             \
+            OPENSSL_strlcat(seeds, str, sizeof(seeds));                 \
+        } while (0)
+#define add_seeds_stringlist(label, strlist)                            \
+        do {                                                            \
+            add_seeds_string(label "(");                                \
+            {                                                           \
+                const char *dev[] = strlist;                            \
+                int first = 1;                                          \
+                                                                        \
+                for (; *dev != NULL; dev++) {                           \
+                    if (!first)                                         \
+                        OPENSSL_strlcat(seeds, " ", sizeof(seeds));     \
+                    first = 0;                                          \
+                    OPENSSL_strlcat(seeds, *dev, sizeof(seeds));        \
+                }                                                       \
+            }                                                           \
+            OPENSSL_strlcat(seeds, ")", sizeof(seeds));                 \
+        } while (0)
+
+#ifdef OPENSSL_RAND_SEED_NONE
+        add_seeds_string("none");
+#endif
+#ifdef OPENSSL_RAND_SEED_RTDSC
+        add_seeds_string("stdsc");
+#endif
+#ifdef OPENSSL_RAND_SEED_RDCPU
+        add_seeds_string("rdrand ( rdseed rdrand )");
+#endif
+#ifdef OPENSSL_RAND_SEED_LIBRANDOM
+        add_seeds_string("C-library-random");
+#endif
+#ifdef OPENSSL_RAND_SEED_GETRANDOM
+        add_seeds_string("getrandom-syscall");
+#endif
+#ifdef OPENSSL_RAND_SEED_DEVRANDOM
+        add_seeds_stringlist("random-device", { DEVRANDOM, NULL });
+#endif
+#ifdef OPENSSL_RAND_SEED_EGD
+        add_seeds_stringlist("EGD", { DEVRANDOM_EGD, NULL });
+#endif
+#ifdef OPENSSL_RAND_SEED_OS
+        add_seeds_string("os-specific");
+#endif
+        seed_sources = seeds;
+    }
+    return 1;
+}
 
 const char *OPENSSL_info(int t)
 {
+    /*
+     * We don't care about the result.  Worst case scenario, the strings
+     * won't be initialised, i.e. remain NULL, which means that the info
+     * isn't available anyway...
+     */
+    (void)RUN_ONCE(&init_info, init_info_strings);
+
     switch (t) {
     case OPENSSL_INFO_CONFIG_DIR:
         return OPENSSLDIR;
@@ -36,6 +105,8 @@ const char *OPENSSL_info(int t)
             static const char list_sep[] = { LIST_SEPARATOR_CHAR, '\0' };
             return list_sep;
         }
+    case OPENSSL_INFO_SEED_SOURCE:
+        return seed_sources;
     default:
         break;
     }