Add a way for the application to get OpenSSL configuration data

OpenSSL_version(OPENSSL_DIR) gives you a nicely formatted string for
display, but if all you really want is the directory itself, you were
forced to parsed the string.

This introduces a new function to get diverse configuration data from
the library, OPENSSL_info().  This works the same way as
OpenSSL_version(), but has its own series of types, currently
including:

OPENSSL_INFO_CONFIG_DIR         returns OPENSSLDIR
OPENSSL_INFO_ENGINES_DIR        returns ENGINESDIR
OPENSSL_INFO_MODULES_DIR        returns MODULESDIR
OPENSSL_INFO_DSO_EXTENSION      returns DSO_EXTENSION

OPENSSL_INFO_DIR_FILENAME_SEPARATOR     returns directory/filename separator
OPENSSL_INFO_LIST_SEPARATOR             returns list separator

For scripting purposes, this also adds the command 'openssl info'.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8709)

3 files changed, 102 insertions, 1 deletions

diff --git a/apps/build.info b/apps/build.info
index ad14038a5d..30847a013d 100644
--- a/apps/build.info
+++ b/apps/build.info
@@ -5,7 +5,8 @@
           genpkey.c genrsa.c mac.c nseq.c ocsp.c passwd.c pkcs12.c pkcs7.c
           pkcs8.c pkey.c pkeyparam.c pkeyutl.c prime.c rand.c req.c rsa.c
           rsautl.c s_client.c s_server.c s_time.c sess_id.c smime.c speed.c
-          spkac.c srp.c ts.c verify.c version.c x509.c rehash.c storeutl.c);
+          spkac.c srp.c ts.c verify.c version.c x509.c rehash.c storeutl.c
+          info.c);
    our @apps_lib_src =
        ( qw(apps.c apps_ui.c opt.c fmt.c s_cb.c s_socket.c app_rand.c
             bf_prefix.c),
diff --git a/apps/info.c b/apps/info.c
new file mode 100644
index 0000000000..aa019ad19e
--- /dev/null
+++ b/apps/info.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/crypto.h>
+#include "apps.h"
+#include "progs.h"
+
+typedef enum OPTION_choice {
+    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
+    OPT_CONFIGDIR, OPT_ENGINESDIR, OPT_MODULESDIR, OPT_DSOEXT, OPT_DIRNAMESEP,
+    OPT_LISTSEP
+} OPTION_CHOICE;
+
+const OPTIONS info_options[] = {
+    {"help", OPT_HELP, '-', "Display this summary"},
+    {"configdir", OPT_CONFIGDIR, '-', "Default configuration file directory"},
+    {"c", OPT_CONFIGDIR, '-', "Default configuration file directory"},
+    {"enginesdir", OPT_ENGINESDIR, '-', "Default engine module directory"},
+    {"e", OPT_ENGINESDIR, '-', "Default engine module directory"},
+    {"modulesdir", OPT_ENGINESDIR, '-',
+     "Default module directory (other than engine modules)"},
+    {"m", OPT_ENGINESDIR, '-',
+     "Default module directory (other than engine modules)"},
+    {"dsoext", OPT_DSOEXT, '-', "Configured extension for modules"},
+    {"dirnamesep", OPT_DIRNAMESEP, '-', "Directory-filename separator"},
+    {"listsep", OPT_LISTSEP, '-', "List separator character"},
+    {NULL}
+};
+
+int info_main(int argc, char **argv)
+{
+    int ret = 1, dirty = 0, type = 0;
+    char *prog;
+    OPTION_CHOICE o;
+
+    prog = opt_init(argc, argv, info_options);
+    while ((o = opt_next()) != OPT_EOF) {
+        switch (o) {
+        case OPT_EOF:
+        case OPT_ERR:
+opthelp:
+            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
+            goto end;
+        case OPT_HELP:
+            opt_help(info_options);
+            ret = 0;
+            goto end;
+        case OPT_CONFIGDIR:
+            type = OPENSSL_INFO_CONFIG_DIR;
+            dirty++;
+            break;
+        case OPT_ENGINESDIR:
+            type = OPENSSL_INFO_ENGINES_DIR;
+            dirty++;
+            break;
+        case OPT_MODULESDIR:
+            type = OPENSSL_INFO_MODULES_DIR;
+            dirty++;
+            break;
+        case OPT_DSOEXT:
+            type = OPENSSL_INFO_DSO_EXTENSION;
+            dirty++;
+            break;
+        case OPT_DIRNAMESEP:
+            type = OPENSSL_INFO_DIR_FILENAME_SEPARATOR;
+            dirty++;
+            break;
+        case OPT_LISTSEP:
+            type = OPENSSL_INFO_LIST_SEPARATOR;
+            dirty++;
+            break;
+        }
+    }
+    if (opt_num_rest() != 0) {
+        BIO_printf(bio_err, "%s: Extra parameters given.\n", prog);
+        goto opthelp;
+    }
+    if (dirty > 1) {
+        BIO_printf(bio_err, "%s: Only one item allowed\n", prog);
+        goto opthelp;
+    }
+    if (dirty == 0) {
+        BIO_printf(bio_err, "%s: No items chosen\n", prog);
+        goto opthelp;
+    }
+
+    BIO_printf(bio_out, "%s\n", OPENSSL_info(type));
+    ret = 0;
+ end:
+    return ret;
+}
diff --git a/apps/progs.pl b/apps/progs.pl
index ab1a729fff..3aec7562cf 100644
--- a/apps/progs.pl
+++ b/apps/progs.pl
@@ -51,6 +51,9 @@ print <<"EOF";
  * https://www.openssl.org/source/license.html
  */
 
+#include <openssl/lhash.h>
+#include "opt.h"
+
 typedef enum FUNC_TYPE {
     FT_none, FT_general, FT_md, FT_cipher, FT_pkey,
     FT_md_alg, FT_cipher_alg