Add the ability to run a server from the command line tool.
Change-Id: Ia8588aeaad8b44a6a306d7d5bfecc895adde1910
diff --git a/tool/CMakeLists.txt b/tool/CMakeLists.txt
index e504838..03c1c21 100644
--- a/tool/CMakeLists.txt
+++ b/tool/CMakeLists.txt
@@ -5,10 +5,12 @@
args.cc
client.cc
+ server.cc
const.cc
pkcs12.cc
speed.cc
tool.cc
+ transport_common.cc
)
if (APPLE OR WIN32)
diff --git a/tool/client.cc b/tool/client.cc
index 21ea8ba..d73d408 100644
--- a/tool/client.cc
+++ b/tool/client.cc
@@ -25,23 +25,11 @@
#include <sys/types.h>
#include <sys/socket.h>
-#if !defined(OPENSSL_WINDOWS)
-#include <arpa/inet.h>
-#include <fcntl.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <sys/select.h>
-#include <unistd.h>
-#else
-#include <WinSock2.h>
-#include <WS2tcpip.h>
-typedef int socklen_t;
-#endif
-
#include <openssl/err.h>
#include <openssl/ssl.h>
#include "internal.h"
+#include "transport_common.h"
static const struct argument kArguments[] = {
@@ -58,200 +46,6 @@
},
};
-// Connect sets |*out_sock| to be a socket connected to the destination given
-// in |hostname_and_port|, which should be of the form "www.example.com:123".
-// It returns true on success and false otherwise.
-static bool Connect(int *out_sock, const std::string &hostname_and_port) {
- const size_t colon_offset = hostname_and_port.find_last_of(':');
- std::string hostname, port;
-
- if (colon_offset == std::string::npos) {
- hostname = hostname_and_port;
- port = "443";
- } else {
- hostname = hostname_and_port.substr(0, colon_offset);
- port = hostname_and_port.substr(colon_offset + 1);
- }
-
- struct addrinfo hint, *result;
- memset(&hint, 0, sizeof(hint));
- hint.ai_family = AF_UNSPEC;
- hint.ai_socktype = SOCK_STREAM;
-
- int ret = getaddrinfo(hostname.c_str(), port.c_str(), &hint, &result);
- if (ret != 0) {
- fprintf(stderr, "getaddrinfo returned: %s\n", gai_strerror(ret));
- return false;
- }
-
- bool ok = false;
- char buf[256];
-
- *out_sock =
- socket(result->ai_family, result->ai_socktype, result->ai_protocol);
- if (*out_sock < 0) {
- perror("socket");
- goto out;
- }
-
- switch (result->ai_family) {
- case AF_INET: {
- struct sockaddr_in *sin =
- reinterpret_cast<struct sockaddr_in *>(result->ai_addr);
- fprintf(stderr, "Connecting to %s:%d\n",
- inet_ntop(result->ai_family, &sin->sin_addr, buf, sizeof(buf)),
- ntohs(sin->sin_port));
- break;
- }
- case AF_INET6: {
- struct sockaddr_in6 *sin6 =
- reinterpret_cast<struct sockaddr_in6 *>(result->ai_addr);
- fprintf(stderr, "Connecting to [%s]:%d\n",
- inet_ntop(result->ai_family, &sin6->sin6_addr, buf, sizeof(buf)),
- ntohs(sin6->sin6_port));
- break;
- }
- }
-
- if (connect(*out_sock, result->ai_addr, result->ai_addrlen) != 0) {
- perror("connect");
- goto out;
- }
- ok = true;
-
-out:
- freeaddrinfo(result);
- return ok;
-}
-
-static void PrintConnectionInfo(const SSL *ssl) {
- const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
-
- fprintf(stderr, " Version: %s\n", SSL_get_version(ssl));
- fprintf(stderr, " Cipher: %s\n", SSL_CIPHER_get_name(cipher));
- fprintf(stderr, " Secure renegotiation: %s\n",
- SSL_get_secure_renegotiation_support(ssl) ? "yes" : "no");
-}
-
-static bool SocketSetNonBlocking(int sock, bool is_non_blocking) {
- bool ok;
-
-#if defined(OPENSSL_WINDOWS)
- u_long arg = is_non_blocking;
- ok = 0 == ioctlsocket(sock, FIOBIO, &arg);
-#else
- int flags = fcntl(sock, F_GETFL, 0);
- if (flags < 0) {
- return false;
- }
- if (is_non_blocking) {
- flags |= O_NONBLOCK;
- } else {
- flags &= ~O_NONBLOCK;
- }
- ok = 0 == fcntl(sock, F_SETFL, flags);
-#endif
- if (!ok) {
- fprintf(stderr, "Failed to set socket non-blocking.\n");
- }
- return ok;
-}
-
-// PrintErrorCallback is a callback function from OpenSSL's
-// |ERR_print_errors_cb| that writes errors to a given |FILE*|.
-static int PrintErrorCallback(const char *str, size_t len, void *ctx) {
- fwrite(str, len, 1, reinterpret_cast<FILE*>(ctx));
- return 1;
-}
-
-bool TransferData(SSL *ssl, int sock) {
- bool stdin_open = true;
-
- fd_set read_fds;
- FD_ZERO(&read_fds);
-
- if (!SocketSetNonBlocking(sock, true)) {
- return false;
- }
-
- for (;;) {
- if (stdin_open) {
- FD_SET(0, &read_fds);
- }
- FD_SET(sock, &read_fds);
-
- int ret = select(sock + 1, &read_fds, NULL, NULL, NULL);
- if (ret <= 0) {
- perror("select");
- return false;
- }
-
- if (FD_ISSET(0, &read_fds)) {
- uint8_t buffer[512];
- ssize_t n;
-
- do {
- n = read(0, buffer, sizeof(buffer));
- } while (n == -1 && errno == EINTR);
-
- if (n == 0) {
- FD_CLR(0, &read_fds);
- stdin_open = false;
- shutdown(sock, SHUT_WR);
- continue;
- } else if (n < 0) {
- perror("read from stdin");
- return false;
- }
-
- if (!SocketSetNonBlocking(sock, false)) {
- return false;
- }
- int ssl_ret = SSL_write(ssl, buffer, n);
- if (!SocketSetNonBlocking(sock, true)) {
- return false;
- }
-
- if (ssl_ret <= 0) {
- int ssl_err = SSL_get_error(ssl, ssl_ret);
- fprintf(stderr, "Error while writing: %d\n", ssl_err);
- ERR_print_errors_cb(PrintErrorCallback, stderr);
- return false;
- } else if (ssl_ret != n) {
- fprintf(stderr, "Short write from SSL_write.\n");
- return false;
- }
- }
-
- if (FD_ISSET(sock, &read_fds)) {
- uint8_t buffer[512];
- int ssl_ret = SSL_read(ssl, buffer, sizeof(buffer));
-
- if (ssl_ret < 0) {
- int ssl_err = SSL_get_error(ssl, ssl_ret);
- if (ssl_err == SSL_ERROR_WANT_READ) {
- continue;
- }
- fprintf(stderr, "Error while reading: %d\n", ssl_err);
- ERR_print_errors_cb(PrintErrorCallback, stderr);
- return false;
- } else if (ssl_ret == 0) {
- return true;
- }
-
- ssize_t n;
- do {
- n = write(1, buffer, ssl_ret);
- } while (n == -1 && errno == EINTR);
-
- if (n != ssl_ret) {
- fprintf(stderr, "Short write to stderr.\n");
- return false;
- }
- }
- }
-}
-
bool Client(const std::vector<std::string> &args) {
std::map<std::string, std::string> args_map;
@@ -272,8 +66,10 @@
SSL_CTX_set_keylog_bio(ctx, keylog_bio);
}
- if (args_map.count("-cipher") != 0) {
- SSL_CTX_set_cipher_list(ctx, args_map["-cipher"].c_str());
+ if (args_map.count("-cipher") != 0 &&
+ !SSL_CTX_set_cipher_list(ctx, args_map["-cipher"].c_str())) {
+ fprintf(stderr, "Failed setting cipher list\n");
+ return false;
}
int sock = -1;
@@ -303,4 +99,5 @@
return ok;
}
-#endif // !OPENSSL_WINDOWS
\ No newline at end of file
+
+#endif // !OPENSSL_WINDOWS
diff --git a/tool/server.cc b/tool/server.cc
new file mode 100644
index 0000000..bc3739f
--- /dev/null
+++ b/tool/server.cc
@@ -0,0 +1,111 @@
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/base.h>
+
+// TODO(davidben): bssl client does not work on Windows.
+#if !defined(OPENSSL_WINDOWS)
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+#include "internal.h"
+#include "transport_common.h"
+
+
+static const struct argument kArguments[] = {
+ {
+ "-accept", true,
+ "The port of the server to bind on; eg 45102",
+ },
+ {
+ "-cipher", false,
+ "An OpenSSL-style cipher suite string that configures the offered ciphers",
+ },
+ {
+ "-key", false,
+ "Private-key file to use (default is server.pem)",
+ },
+ {
+ "", false, "",
+ },
+};
+
+bool Server(const std::vector<std::string> &args) {
+ std::map<std::string, std::string> args_map;
+
+ if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
+ PrintUsage(kArguments);
+ return false;
+ }
+
+ SSL_CTX *ctx = SSL_CTX_new(SSLv23_server_method());
+ SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3);
+
+ // Server authentication is required.
+ std::string key_file = "server.pem";
+ if (args_map.count("-key") != 0) {
+ key_file = args_map["-key"];
+ }
+ if (SSL_CTX_use_PrivateKey_file(ctx, key_file.c_str(), SSL_FILETYPE_PEM) <= 0) {
+ fprintf(stderr, "Failed to load private key: %s\n", key_file.c_str());
+ return false;
+ }
+ if (SSL_CTX_use_certificate_chain_file(ctx, key_file.c_str()) != 1) {
+ fprintf(stderr, "Failed to load cert chain: %s\n", key_file.c_str());
+ return false;
+ }
+
+ if (args_map.count("-cipher") != 0 &&
+ !SSL_CTX_set_cipher_list(ctx, args_map["-cipher"].c_str())) {
+ fprintf(stderr, "Failed setting cipher list\n");
+ return false;
+ }
+
+ int sock = -1;
+ if (!Accept(&sock, args_map["-accept"])) {
+ return false;
+ }
+
+ BIO *bio = BIO_new_socket(sock, BIO_CLOSE);
+ SSL *ssl = SSL_new(ctx);
+ SSL_set_bio(ssl, bio, bio);
+
+ int ret = SSL_accept(ssl);
+ if (ret != 1) {
+ int ssl_err = SSL_get_error(ssl, ret);
+ fprintf(stderr, "Error while connecting: %d\n", ssl_err);
+ ERR_print_errors_cb(PrintErrorCallback, stderr);
+ return false;
+ }
+
+ fprintf(stderr, "Connected.\n");
+ PrintConnectionInfo(ssl);
+
+ bool ok = TransferData(ssl, sock);
+
+ SSL_free(ssl);
+ SSL_CTX_free(ctx);
+ return ok;
+}
+
+
+#endif // !OPENSSL_WINDOWS
diff --git a/tool/tool.cc b/tool/tool.cc
index f35cc7c..a57cd16 100644
--- a/tool/tool.cc
+++ b/tool/tool.cc
@@ -21,12 +21,13 @@
#if !defined(OPENSSL_WINDOWS)
bool Client(const std::vector<std::string> &args);
+bool Server(const std::vector<std::string> &args);
#endif
bool DoPKCS12(const std::vector<std::string> &args);
bool Speed(const std::vector<std::string> &args);
static void usage(const char *name) {
- printf("Usage: %s [speed|client|pkcs12]\n", name);
+ printf("Usage: %s [speed|client|server|pkcs12]\n", name);
}
int main(int argc, char **argv) {
@@ -47,6 +48,8 @@
#if !defined(OPENSSL_WINDOWS)
} else if (tool == "s_client" || tool == "client") {
return !Client(args);
+ } else if (tool == "s_server" || tool == "server") {
+ return !Server(args);
#endif
} else if (tool == "pkcs12") {
return !DoPKCS12(args);
diff --git a/tool/transport_common.cc b/tool/transport_common.cc
new file mode 100644
index 0000000..528dd3e
--- /dev/null
+++ b/tool/transport_common.cc
@@ -0,0 +1,276 @@
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/base.h>
+
+// TODO(davidben): bssl client does not work on Windows.
+#if !defined(OPENSSL_WINDOWS)
+
+#include <string>
+#include <vector>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#if !defined(OPENSSL_WINDOWS)
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/select.h>
+#include <unistd.h>
+#else
+#include <WinSock2.h>
+#include <WS2tcpip.h>
+typedef int socklen_t;
+#endif
+
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+#include "internal.h"
+
+
+// Connect sets |*out_sock| to be a socket connected to the destination given
+// in |hostname_and_port|, which should be of the form "www.example.com:123".
+// It returns true on success and false otherwise.
+bool Connect(int *out_sock, const std::string &hostname_and_port) {
+ const size_t colon_offset = hostname_and_port.find_last_of(':');
+ std::string hostname, port;
+
+ if (colon_offset == std::string::npos) {
+ hostname = hostname_and_port;
+ port = "443";
+ } else {
+ hostname = hostname_and_port.substr(0, colon_offset);
+ port = hostname_and_port.substr(colon_offset + 1);
+ }
+
+ struct addrinfo hint, *result;
+ memset(&hint, 0, sizeof(hint));
+ hint.ai_family = AF_UNSPEC;
+ hint.ai_socktype = SOCK_STREAM;
+
+ int ret = getaddrinfo(hostname.c_str(), port.c_str(), &hint, &result);
+ if (ret != 0) {
+ fprintf(stderr, "getaddrinfo returned: %s\n", gai_strerror(ret));
+ return false;
+ }
+
+ bool ok = false;
+ char buf[256];
+
+ *out_sock =
+ socket(result->ai_family, result->ai_socktype, result->ai_protocol);
+ if (*out_sock < 0) {
+ perror("socket");
+ goto out;
+ }
+
+ switch (result->ai_family) {
+ case AF_INET: {
+ struct sockaddr_in *sin =
+ reinterpret_cast<struct sockaddr_in *>(result->ai_addr);
+ fprintf(stderr, "Connecting to %s:%d\n",
+ inet_ntop(result->ai_family, &sin->sin_addr, buf, sizeof(buf)),
+ ntohs(sin->sin_port));
+ break;
+ }
+ case AF_INET6: {
+ struct sockaddr_in6 *sin6 =
+ reinterpret_cast<struct sockaddr_in6 *>(result->ai_addr);
+ fprintf(stderr, "Connecting to [%s]:%d\n",
+ inet_ntop(result->ai_family, &sin6->sin6_addr, buf, sizeof(buf)),
+ ntohs(sin6->sin6_port));
+ break;
+ }
+ }
+
+ if (connect(*out_sock, result->ai_addr, result->ai_addrlen) != 0) {
+ perror("connect");
+ goto out;
+ }
+ ok = true;
+
+out:
+ freeaddrinfo(result);
+ return ok;
+}
+
+bool Accept(int *out_sock, const std::string &port) {
+ struct sockaddr_in addr, cli_addr;
+ socklen_t cli_addr_len = sizeof(cli_addr);
+ memset(&addr, 0, sizeof(addr));
+
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = INADDR_ANY;
+ addr.sin_port = htons(atoi(port.c_str()));
+
+ bool ok = false;
+ int server_sock = -1;
+
+ server_sock =
+ socket(addr.sin_family, SOCK_STREAM, 0);
+ if (server_sock < 0) {
+ perror("socket");
+ goto out;
+ }
+
+ if (bind(server_sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
+ perror("connect");
+ goto out;
+ }
+ listen(server_sock, 1);
+ *out_sock = accept(server_sock, (struct sockaddr*)&cli_addr, &cli_addr_len);
+
+ ok = true;
+
+out:
+ close(server_sock);
+ return ok;
+}
+
+void PrintConnectionInfo(const SSL *ssl) {
+ const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
+
+ fprintf(stderr, " Version: %s\n", SSL_get_version(ssl));
+ fprintf(stderr, " Cipher: %s\n", SSL_CIPHER_get_name(cipher));
+ fprintf(stderr, " Secure renegotiation: %s\n",
+ SSL_get_secure_renegotiation_support(ssl) ? "yes" : "no");
+}
+
+bool SocketSetNonBlocking(int sock, bool is_non_blocking) {
+ bool ok;
+
+#if defined(OPENSSL_WINDOWS)
+ u_long arg = is_non_blocking;
+ ok = 0 == ioctlsocket(sock, FIOBIO, &arg);
+#else
+ int flags = fcntl(sock, F_GETFL, 0);
+ if (flags < 0) {
+ return false;
+ }
+ if (is_non_blocking) {
+ flags |= O_NONBLOCK;
+ } else {
+ flags &= ~O_NONBLOCK;
+ }
+ ok = 0 == fcntl(sock, F_SETFL, flags);
+#endif
+ if (!ok) {
+ fprintf(stderr, "Failed to set socket non-blocking.\n");
+ }
+ return ok;
+}
+
+// PrintErrorCallback is a callback function from OpenSSL's
+// |ERR_print_errors_cb| that writes errors to a given |FILE*|.
+int PrintErrorCallback(const char *str, size_t len, void *ctx) {
+ fwrite(str, len, 1, reinterpret_cast<FILE*>(ctx));
+ return 1;
+}
+
+bool TransferData(SSL *ssl, int sock) {
+ bool stdin_open = true;
+
+ fd_set read_fds;
+ FD_ZERO(&read_fds);
+
+ if (!SocketSetNonBlocking(sock, true)) {
+ return false;
+ }
+
+ for (;;) {
+ if (stdin_open) {
+ FD_SET(0, &read_fds);
+ }
+ FD_SET(sock, &read_fds);
+
+ int ret = select(sock + 1, &read_fds, NULL, NULL, NULL);
+ if (ret <= 0) {
+ perror("select");
+ return false;
+ }
+
+ if (FD_ISSET(0, &read_fds)) {
+ uint8_t buffer[512];
+ ssize_t n;
+
+ do {
+ n = read(0, buffer, sizeof(buffer));
+ } while (n == -1 && errno == EINTR);
+
+ if (n == 0) {
+ FD_CLR(0, &read_fds);
+ stdin_open = false;
+ shutdown(sock, SHUT_WR);
+ continue;
+ } else if (n < 0) {
+ perror("read from stdin");
+ return false;
+ }
+
+ if (!SocketSetNonBlocking(sock, false)) {
+ return false;
+ }
+ int ssl_ret = SSL_write(ssl, buffer, n);
+ if (!SocketSetNonBlocking(sock, true)) {
+ return false;
+ }
+
+ if (ssl_ret <= 0) {
+ int ssl_err = SSL_get_error(ssl, ssl_ret);
+ fprintf(stderr, "Error while writing: %d\n", ssl_err);
+ ERR_print_errors_cb(PrintErrorCallback, stderr);
+ return false;
+ } else if (ssl_ret != n) {
+ fprintf(stderr, "Short write from SSL_write.\n");
+ return false;
+ }
+ }
+
+ if (FD_ISSET(sock, &read_fds)) {
+ uint8_t buffer[512];
+ int ssl_ret = SSL_read(ssl, buffer, sizeof(buffer));
+
+ if (ssl_ret < 0) {
+ int ssl_err = SSL_get_error(ssl, ssl_ret);
+ if (ssl_err == SSL_ERROR_WANT_READ) {
+ continue;
+ }
+ fprintf(stderr, "Error while reading: %d\n", ssl_err);
+ ERR_print_errors_cb(PrintErrorCallback, stderr);
+ return false;
+ } else if (ssl_ret == 0) {
+ return true;
+ }
+
+ ssize_t n;
+ do {
+ n = write(1, buffer, ssl_ret);
+ } while (n == -1 && errno == EINTR);
+
+ if (n != ssl_ret) {
+ fprintf(stderr, "Short write to stderr.\n");
+ return false;
+ }
+ }
+ }
+}
+
+
+#endif // !OPENSSL_WINDOWS
diff --git a/tool/transport_common.h b/tool/transport_common.h
new file mode 100644
index 0000000..6b96659
--- /dev/null
+++ b/tool/transport_common.h
@@ -0,0 +1,41 @@
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H
+#define OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H
+
+#include <openssl/ssl.h>
+#include <string.h>
+
+
+// Connect sets |*out_sock| to be a socket connected to the destination given
+// in |hostname_and_port|, which should be of the form "www.example.com:123".
+// It returns true on success and false otherwise.
+bool Connect(int *out_sock, const std::string &hostname_and_port);
+
+// Accept sets |*out_sock| to be a socket connected to the port given
+// in |port|, which should be of the form "123".
+// It returns true on success and false otherwise.
+bool Accept(int *out_sock, const std::string &port);
+
+void PrintConnectionInfo(const SSL *ssl);
+
+bool SocketSetNonBlocking(int sock, bool is_non_blocking);
+
+int PrintErrorCallback(const char *str, size_t len, void *ctx);
+
+bool TransferData(SSL *ssl, int sock);
+
+
+#endif /* !OPENSSL_HEADER_TOOL_TRANSPORT_COMMON_H */
