SSL socket snippet, server checks client's certificates

SSL_Socket_snippet/sslsock.h

@@ -0,0 +1,41 @@
+/*
+ * This file is part of the sslsosk project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <arpa/inet.h>  // inet_ntop
+#include <fcntl.h>
+#include <netdb.h>      // addrinfo
+#include <netinet/in.h>
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#if ! defined CLIENT && ! defined SERVER
+#error "Define CLIENT or SERVER before including this file"
+#endif
+#if defined CLIENT && defined SERVER
+#error "Both CLIENT and SERVER defined"
+#endif
+
+#define BACKLOG     10
+
+int open_socket();
+int read_string(SSL *ssl, char *buf, int l);