src: improve SSL version extraction logic

The openssl version as defined in ssl libraries is complex.
The current logic to extract the major.minor.patch format
uses C semantics to loop through the text and search for
specific patterns. Use C++ string to tidy it up.

PR-URL: #23050
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

src/node.cc

@@ -236,24 +236,7 @@ class NodeTraceStateObserver :
     trace_process->SetString("napi", node_napi_version);
 
 #if HAVE_OPENSSL
-    // Stupid code to slice out the version string.
-    {  // NOLINT(whitespace/braces)
-      size_t i, j, k;
-      int c;
-      for (i = j = 0, k = sizeof(OPENSSL_VERSION_TEXT) - 1; i < k; ++i) {
-        c = OPENSSL_VERSION_TEXT[i];
-        if ('0' <= c && c <= '9') {
-          for (j = i + 1; j < k; ++j) {
-            c = OPENSSL_VERSION_TEXT[j];
-            if (c == ' ')
-              break;
-          }
-          break;
-        }
-      }
-      trace_process->SetString("openssl",
-                              std::string(&OPENSSL_VERSION_TEXT[i], j - i));
-    }
+    trace_process->SetString("openssl", crypto::GetOpenSSLVersion());
 #endif
     trace_process->EndDictionary();
 
@@ -1762,26 +1745,10 @@ void SetupProcessObject(Environment* env,
       FIXED_ONE_BYTE_STRING(env->isolate(), node_napi_version));
 
 #if HAVE_OPENSSL
-  // Stupid code to slice out the version string.
-  {  // NOLINT(whitespace/braces)
-    size_t i, j, k;
-    int c;
-    for (i = j = 0, k = sizeof(OPENSSL_VERSION_TEXT) - 1; i < k; ++i) {
-      c = OPENSSL_VERSION_TEXT[i];
-      if ('0' <= c && c <= '9') {
-        for (j = i + 1; j < k; ++j) {
-          c = OPENSSL_VERSION_TEXT[j];
-          if (c == ' ')
-            break;
-        }
-        break;
-      }
-    }
-    READONLY_PROPERTY(
-        versions,
-        "openssl",
-        OneByteString(env->isolate(), &OPENSSL_VERSION_TEXT[i], j - i));
-  }
+  READONLY_PROPERTY(
+      versions,
+      "openssl",
+      OneByteString(env->isolate(), crypto::GetOpenSSLVersion().c_str()));
 #endif
 
   // process.arch

src/node_crypto.cc

@@ -5745,6 +5745,21 @@ void Initialize(Local<Object> target,
 #endif  // OPENSSL_NO_SCRYPT
 }
 
+constexpr int search(const char* s, int n, int c) {
+  return *s == c ? n : search(s + 1, n + 1, c);
+}
+
+std::string GetOpenSSLVersion() {
+  // sample openssl version string format
+  // for reference: "OpenSSL 1.1.0i 14 Aug 2018"
+  char buf[128];
+  const int start = search(OPENSSL_VERSION_TEXT, 0, ' ') + 1;
+  const int end = search(OPENSSL_VERSION_TEXT + start, start, ' ') + 1;
+  const int len = end - start;
+  snprintf(buf, len, "%.*s\n", len, &OPENSSL_VERSION_TEXT[start]);
+  return std::string(buf);
+}
+
 }  // namespace crypto
 }  // namespace node
 

src/node_crypto.h

@@ -93,6 +93,7 @@ extern int VerifyCallback(int preverify_ok, X509_STORE_CTX* ctx);
 extern void UseExtraCaCerts(const std::string& file);
 
 void InitCryptoOnce();
+std::string GetOpenSSLVersion();
 
 class SecureContext : public BaseObject {
  public: