QUIC: Add compile/run-time checking for QUIC

apps/info.c

@@ -15,6 +15,9 @@ typedef enum OPTION_choice {
     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
     OPT_CONFIGDIR, OPT_ENGINESDIR, OPT_MODULESDIR, OPT_DSOEXT, OPT_DIRNAMESEP,
     OPT_LISTSEP, OPT_SEEDS, OPT_CPUSETTINGS
+#ifndef OPENSSL_NO_QUIC
+    , OPT_QUIC
+#endif
 } OPTION_CHOICE;
 
 const OPTIONS info_options[] = {
@@ -32,6 +35,9 @@ const OPTIONS info_options[] = {
     {"listsep", OPT_LISTSEP, '-', "List separator character"},
     {"seeds", OPT_SEEDS, '-', "Seed sources"},
     {"cpusettings", OPT_CPUSETTINGS, '-', "CPU settings info"},
+#ifndef OPENSSL_NO_QUIC
+    {"quic", OPT_QUIC, '-', "QUIC info"},
+#endif
     {NULL}
 };
 
@@ -84,6 +90,12 @@ int info_main(int argc, char **argv)
             type = OPENSSL_INFO_CPU_SETTINGS;
             dirty++;
             break;
+#ifndef OPENSSL_NO_QUIC
+        case OPT_QUIC:
+            type = OPENSSL_INFO_QUIC;
+            dirty++;
+            break;
+#endif
         }
     }
     if (opt_num_rest() != 0)

crypto/info.c

@@ -199,6 +199,10 @@ const char *OPENSSL_info(int t)
         if (ossl_cpu_info_str[0] != '\0')
             return ossl_cpu_info_str + strlen(CPUINFO_PREFIX);
         break;
+#ifndef OPENSSL_NO_QUIC
+    case OPENSSL_INFO_QUIC:
+        return "QUIC";
+#endif
     default:
         break;
     }

doc/man3/OpenSSL_version.pod

@@ -186,6 +186,14 @@ automatically configured but may be set via an environment variable.
 The value has the same syntax as the environment variable.
 For x86 the string looks like C<OPENSSL_ia32cap=0x123:0x456>.
 
+=item OPENSSL_INFO_QUIC
+
+This is only defined when compiling with a QUIC-enabled version of
+OpenSSL. At run time, this will return "QUIC" if QUIC is supported.
+
+This can be used as a build time flag to determine if OpenSSL has
+QUIC enabled.
+
 =back
 
 For an unknown I<t>, NULL is returned.

include/openssl/crypto.h.in

@@ -173,6 +173,10 @@ const char *OPENSSL_info(int type);
 # define OPENSSL_INFO_SEED_SOURCE               1007
 # define OPENSSL_INFO_CPU_SETTINGS              1008
 
+# ifndef OPENSSL_NO_QUIC
+#  define OPENSSL_INFO_QUIC                     2000
+# endif
+
 int OPENSSL_issetugid(void);
 
 struct crypto_ex_data_st {