feat: implement SSLSocket for encrypted connections and add terminal size detection utility

1 files changed, 118 insertions, 0 deletions

diff --git a/src/net/ssl_socket.cc b/src/net/ssl_socket.cc
new file mode 100644
index 0000000..a31b564
--- /dev/null
+++ b/src/net/ssl_socket.cc
@@ -0,0 +1,118 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "ricochet/net/ssl_socket.hh"
+#include <iostream>
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#include <stdexcept>
+
+namespace ricochet::net {
+
+// --- RAII Deleters ---
+
+void SslCtxDeleter::operator()( SSL_CTX* ptr ) const
+{
+  if ( ptr != nullptr ) {
+    SSL_CTX_free( ptr );
+  }
+}
+
+void SslDeleter::operator()( SSL* ptr ) const
+{
+  if ( ptr != nullptr ) {
+    SSL_free( ptr );
+  }
+}
+
+// SSLSocket Implementation
+
+SSLSocket::SSLSocket()
+{
+  const SSL_METHOD* method = TLS_client_method();
+  ctx_.reset( SSL_CTX_new( method ) );
+  if ( !ctx_ ) {
+    throw std::runtime_error( "Failed to create SSL_CTX" );
+  }
+
+  if ( SSL_CTX_set_default_verify_paths( ctx_.get() ) != 1 ) {
+    throw std::runtime_error( "Failed to load default CA certificates" );
+  }
+}
+
+void SSLSocket::connect( const Address& address, const std::string& hostname )
+{
+  // TCP Connect
+  underlying_socket_.connect( address );
+
+  ssl_.reset( SSL_new( ctx_.get() ) );
+  if ( !ssl_ ) {
+    throw std::runtime_error( "Failed to create SSL object" );
+  }
+
+  // Setup SNI (Server Name Indication)
+  if ( SSL_set_tlsext_host_name( ssl_.get(), hostname.c_str() ) != 1 ) {
+    // Some old servers do not support SNI, here we can ignore the error or throw an exception, depending on the
+    // requirements
+    std::cerr << "Warning: Failed to set SNI" << '\n';
+  }
+
+  SSL_set_fd( ssl_.get(), underlying_socket_.fd_num() );
+
+  if ( SSL_connect( ssl_.get() ) != 1 ) {
+    throw std::runtime_error( "TLS Handshake failed!" );
+  }
+}
+
+std::size_t SSLSocket::write( std::string_view data )
+{
+  if ( !ssl_ ) {
+    return 0;
+  }
+
+  const int bytes_written = SSL_write( ssl_.get(), data.data(), static_cast<int>( data.size() ) );
+  if ( bytes_written <= 0 ) {
+    throw std::runtime_error( "SSL write failed" );
+  }
+  return static_cast<std::size_t>( bytes_written );
+}
+
+void SSLSocket::read( std::string& buffer )
+{
+  if ( !ssl_ ) {
+    return;
+  }
+
+  std::array<char, 4096> buf {};
+  // Read decrypted data from the encrypted channel
+  const int bytes_read = SSL_read( ssl_.get(), buf.data(), static_cast<int>( buf.size() ) );
+
+  if ( bytes_read > 0 ) {
+    buffer.append( buf.data(), static_cast<std::size_t>( bytes_read ) );
+  } else {
+    // Read 0 or negative, representing the server closed the connection (EOF)
+    eof_ = true;
+  }
+}
+
+bool SSLSocket::eof() const
+{
+  return eof_;
+}
+
+} // namespace ricochet::net
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