- /* 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>
-
- #include <string>
- #include <vector>
-
- #include <errno.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
-
- #if !defined(OPENSSL_WINDOWS)
- #include <arpa/inet.h>
- #include <fcntl.h>
- #include <netdb.h>
- #include <netinet/in.h>
- #include <sys/select.h>
- #include <sys/socket.h>
- #include <unistd.h>
- #else
- #include <io.h>
- #pragma warning(push, 3)
- #include <winsock2.h>
- #include <ws2tcpip.h>
- #pragma warning(pop)
-
- typedef int ssize_t;
- #pragma comment(lib, "Ws2_32.lib")
- #endif
-
- #include <openssl/err.h>
- #include <openssl/ssl.h>
-
- #include "internal.h"
-
-
- #if !defined(OPENSSL_WINDOWS)
- static int closesocket(int sock) {
- return close(sock);
- }
- #endif
-
- bool InitSocketLibrary() {
- #if defined(OPENSSL_WINDOWS)
- WSADATA wsaData;
- int err = WSAStartup(MAKEWORD(2, 2), &wsaData);
- if (err != 0) {
- fprintf(stderr, "WSAStartup failed with error %d\n", err);
- return false;
- }
- #endif
- return true;
- }
-
- // 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:
- closesocket(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");
-
- const uint8_t *next_proto;
- unsigned next_proto_len;
- SSL_get0_next_proto_negotiated(ssl, &next_proto, &next_proto_len);
- fprintf(stderr, " Next protocol negotiated: %.*s\n", next_proto_len,
- next_proto);
-
- const uint8_t *alpn;
- unsigned alpn_len;
- SSL_get0_alpn_selected(ssl, &alpn, &alpn_len);
- fprintf(stderr, " ALPN protocol: %.*s\n", alpn_len, alpn);
- }
-
- bool SocketSetNonBlocking(int sock, bool is_non_blocking) {
- bool ok;
-
- #if defined(OPENSSL_WINDOWS)
- u_long arg = is_non_blocking;
- ok = 0 == ioctlsocket(sock, FIONBIO, &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;
- #if !defined(OPENSSL_WINDOWS)
- shutdown(sock, SHUT_WR);
- #else
- shutdown(sock, SD_SEND);
- #endif
- 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;
- }
- }
- }
- }
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