- /* 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. */
-
- // Suppress MSVC's STL warnings. It flags |std::copy| calls with a raw output
- // pointer, on grounds that MSVC cannot check them. Unfortunately, there is no
- // way to suppress the warning just on one line. The warning is flagged inside
- // the STL itself, so suppressing at the |std::copy| call does not work.
- #define _SCL_SECURE_NO_WARNINGS
-
- #include <openssl/base.h>
-
- #include <string>
- #include <vector>
-
- #include <errno.h>
- #include <limits.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 <algorithm>
- #include <condition_variable>
- #include <deque>
- #include <memory>
- #include <mutex>
- #include <thread>
- #include <utility>
-
- #include <io.h>
- OPENSSL_MSVC_PRAGMA(warning(push, 3))
- #include <winsock2.h>
- #include <ws2tcpip.h>
- OPENSSL_MSVC_PRAGMA(warning(pop))
-
- typedef int ssize_t;
- OPENSSL_MSVC_PRAGMA(comment(lib, "Ws2_32.lib"))
- #endif
-
- #include <openssl/err.h>
- #include <openssl/ssl.h>
- #include <openssl/x509.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
- #include "transport_common.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;
- }
-
- static void SplitHostPort(std::string *out_hostname, std::string *out_port,
- const std::string &hostname_and_port) {
- size_t colon_offset = hostname_and_port.find_last_of(':');
- const size_t bracket_offset = hostname_and_port.find_last_of(']');
- std::string hostname, port;
-
- // An IPv6 literal may have colons internally, guarded by square brackets.
- if (bracket_offset != std::string::npos &&
- colon_offset != std::string::npos && bracket_offset > colon_offset) {
- colon_offset = std::string::npos;
- }
-
- if (colon_offset == std::string::npos) {
- *out_hostname = hostname_and_port;
- *out_port = "443";
- } else {
- *out_hostname = hostname_and_port.substr(0, colon_offset);
- *out_port = hostname_and_port.substr(colon_offset + 1);
- }
- }
-
- static std::string GetLastSocketErrorString() {
- #if defined(OPENSSL_WINDOWS)
- int error = WSAGetLastError();
- char *buffer;
- DWORD len = FormatMessageA(
- FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER, 0, error, 0,
- reinterpret_cast<char *>(&buffer), 0, nullptr);
- if (len == 0) {
- char buf[256];
- snprintf(buf, sizeof(buf), "unknown error (0x%x)", error);
- return buf;
- }
- std::string ret(buffer, len);
- LocalFree(buffer);
- return ret;
- #else
- return strerror(errno);
- #endif
- }
-
- static void PrintSocketError(const char *function) {
- // On Windows, |perror| and |errno| are part of the C runtime, while sockets
- // are separate, so we must print errors manually.
- std::string error = GetLastSocketErrorString();
- fprintf(stderr, "%s: %s\n", function, error.c_str());
- }
-
- // 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) {
- std::string hostname, port;
- SplitHostPort(&hostname, &port, hostname_and_port);
-
- // Handle IPv6 literals.
- if (hostname.size() >= 2 && hostname[0] == '[' &&
- hostname[hostname.size() - 1] == ']') {
- hostname = hostname.substr(1, hostname.size() - 2);
- }
-
- struct addrinfo hint, *result;
- OPENSSL_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) {
- PrintSocketError("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) {
- PrintSocketError("connect");
- goto out;
- }
- ok = true;
-
- out:
- freeaddrinfo(result);
- return ok;
- }
-
- Listener::~Listener() {
- if (server_sock_ >= 0) {
- closesocket(server_sock_);
- }
- }
-
- bool Listener::Init(const std::string &port) {
- if (server_sock_ >= 0) {
- return false;
- }
-
- struct sockaddr_in6 addr;
- OPENSSL_memset(&addr, 0, sizeof(addr));
-
- addr.sin6_family = AF_INET6;
- // Windows' IN6ADDR_ANY_INIT does not have enough curly braces for clang-cl
- // (https://crbug.com/772108), while other platforms like NaCl are missing
- // in6addr_any, so use a mix of both.
- #if defined(OPENSSL_WINDOWS)
- addr.sin6_addr = in6addr_any;
- #else
- addr.sin6_addr = IN6ADDR_ANY_INIT;
- #endif
- addr.sin6_port = htons(atoi(port.c_str()));
-
- #if defined(OPENSSL_WINDOWS)
- const BOOL enable = TRUE;
- #else
- const int enable = 1;
- #endif
-
- server_sock_ = socket(addr.sin6_family, SOCK_STREAM, 0);
- if (server_sock_ < 0) {
- PrintSocketError("socket");
- return false;
- }
-
- if (setsockopt(server_sock_, SOL_SOCKET, SO_REUSEADDR, (const char *)&enable,
- sizeof(enable)) < 0) {
- PrintSocketError("setsockopt");
- return false;
- }
-
- if (bind(server_sock_, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
- PrintSocketError("connect");
- return false;
- }
-
- listen(server_sock_, SOMAXCONN);
- return true;
- }
-
- bool Listener::Accept(int *out_sock) {
- struct sockaddr_in6 addr;
- socklen_t addr_len = sizeof(addr);
- *out_sock = accept(server_sock_, (struct sockaddr *)&addr, &addr_len);
- return *out_sock >= 0;
- }
-
- bool VersionFromString(uint16_t *out_version, const std::string &version) {
- if (version == "ssl3") {
- *out_version = SSL3_VERSION;
- return true;
- } else if (version == "tls1" || version == "tls1.0") {
- *out_version = TLS1_VERSION;
- return true;
- } else if (version == "tls1.1") {
- *out_version = TLS1_1_VERSION;
- return true;
- } else if (version == "tls1.2") {
- *out_version = TLS1_2_VERSION;
- return true;
- } else if (version == "tls1.3") {
- *out_version = TLS1_3_VERSION;
- return true;
- }
- return false;
- }
-
- void PrintConnectionInfo(BIO *bio, const SSL *ssl) {
- const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
-
- BIO_printf(bio, " Version: %s\n", SSL_get_version(ssl));
- BIO_printf(bio, " Resumed session: %s\n",
- SSL_session_reused(ssl) ? "yes" : "no");
- BIO_printf(bio, " Cipher: %s\n", SSL_CIPHER_standard_name(cipher));
- uint16_t curve = SSL_get_curve_id(ssl);
- if (curve != 0) {
- BIO_printf(bio, " ECDHE curve: %s\n", SSL_get_curve_name(curve));
- }
- uint16_t sigalg = SSL_get_peer_signature_algorithm(ssl);
- if (sigalg != 0) {
- BIO_printf(bio, " Signature algorithm: %s\n",
- SSL_get_signature_algorithm_name(
- sigalg, SSL_version(ssl) != TLS1_2_VERSION));
- }
- BIO_printf(bio, " Secure renegotiation: %s\n",
- SSL_get_secure_renegotiation_support(ssl) ? "yes" : "no");
- BIO_printf(bio, " Extended master secret: %s\n",
- SSL_get_extms_support(ssl) ? "yes" : "no");
-
- const uint8_t *next_proto;
- unsigned next_proto_len;
- SSL_get0_next_proto_negotiated(ssl, &next_proto, &next_proto_len);
- BIO_printf(bio, " 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);
- BIO_printf(bio, " ALPN protocol: %.*s\n", alpn_len, alpn);
-
- const char *host_name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
- if (host_name != nullptr && SSL_is_server(ssl)) {
- BIO_printf(bio, " Client sent SNI: %s\n", host_name);
- }
-
- if (!SSL_is_server(ssl)) {
- const uint8_t *ocsp_staple;
- size_t ocsp_staple_len;
- SSL_get0_ocsp_response(ssl, &ocsp_staple, &ocsp_staple_len);
- BIO_printf(bio, " OCSP staple: %s\n", ocsp_staple_len > 0 ? "yes" : "no");
-
- const uint8_t *sct_list;
- size_t sct_list_len;
- SSL_get0_signed_cert_timestamp_list(ssl, &sct_list, &sct_list_len);
- BIO_printf(bio, " SCT list: %s\n", sct_list_len > 0 ? "yes" : "no");
- }
-
- BIO_printf(
- bio, " Early data: %s\n",
- (SSL_early_data_accepted(ssl) || SSL_in_early_data(ssl)) ? "yes" : "no");
-
- // Print the server cert subject and issuer names.
- bssl::UniquePtr<X509> peer(SSL_get_peer_certificate(ssl));
- if (peer != nullptr) {
- BIO_printf(bio, " Cert subject: ");
- X509_NAME_print_ex(bio, X509_get_subject_name(peer.get()), 0,
- XN_FLAG_ONELINE);
- BIO_printf(bio, "\n Cert issuer: ");
- X509_NAME_print_ex(bio, X509_get_issuer_name(peer.get()), 0,
- XN_FLAG_ONELINE);
- BIO_printf(bio, "\n");
- }
- }
-
- 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) {
- PrintSocketError("Failed to set socket non-blocking");
- }
- return ok;
- }
-
- enum class StdinWait {
- kStdinRead,
- kSocketWrite,
- };
-
- #if !defined(OPENSSL_WINDOWS)
-
- // SocketWaiter abstracts waiting for either the socket or stdin to be readable
- // between Windows and POSIX.
- class SocketWaiter {
- public:
- explicit SocketWaiter(int sock) : sock_(sock) {}
- SocketWaiter(const SocketWaiter &) = delete;
- SocketWaiter &operator=(const SocketWaiter &) = delete;
-
- // Init initializes the SocketWaiter. It returns whether it succeeded.
- bool Init() { return true; }
-
- // Wait waits for at least on of the socket or stdin or be ready. On success,
- // it sets |*socket_ready| and |*stdin_ready| to whether the respective
- // objects are readable and returns true. On error, it returns false. stdin's
- // readiness may either be the socket being writable or stdin being readable,
- // depending on |stdin_wait|.
- bool Wait(StdinWait stdin_wait, bool *socket_ready, bool *stdin_ready) {
- *socket_ready = true;
- *stdin_ready = false;
-
- fd_set read_fds, write_fds;
- FD_ZERO(&read_fds);
- FD_ZERO(&write_fds);
- if (stdin_wait == StdinWait::kSocketWrite) {
- FD_SET(sock_, &write_fds);
- } else if (stdin_open_) {
- FD_SET(STDIN_FILENO, &read_fds);
- }
- FD_SET(sock_, &read_fds);
- if (select(sock_ + 1, &read_fds, &write_fds, NULL, NULL) <= 0) {
- perror("select");
- return false;
- }
-
- if (FD_ISSET(STDIN_FILENO, &read_fds) || FD_ISSET(sock_, &write_fds)) {
- *stdin_ready = true;
- }
- if (FD_ISSET(sock_, &read_fds)) {
- *socket_ready = true;
- }
-
- return true;
- }
-
- // ReadStdin reads at most |max_out| bytes from stdin. On success, it writes
- // them to |out| and sets |*out_len| to the number of bytes written. On error,
- // it returns false. This method may only be called after |Wait| returned
- // stdin was ready.
- bool ReadStdin(void *out, size_t *out_len, size_t max_out) {
- ssize_t n;
- do {
- n = read(STDIN_FILENO, out, max_out);
- } while (n == -1 && errno == EINTR);
- if (n <= 0) {
- stdin_open_ = false;
- }
- if (n < 0) {
- perror("read from stdin");
- return false;
- }
- *out_len = static_cast<size_t>(n);
- return true;
- }
-
- private:
- bool stdin_open_ = true;
- int sock_;
- };
-
- #else // OPENSSL_WINDOWs
-
- class ScopedWSAEVENT {
- public:
- ScopedWSAEVENT() = default;
- ScopedWSAEVENT(WSAEVENT event) { reset(event); }
- ScopedWSAEVENT(const ScopedWSAEVENT &) = delete;
- ScopedWSAEVENT(ScopedWSAEVENT &&other) { *this = std::move(other); }
-
- ~ScopedWSAEVENT() { reset(); }
-
- ScopedWSAEVENT &operator=(const ScopedWSAEVENT &) = delete;
- ScopedWSAEVENT &operator=(ScopedWSAEVENT &&other) {
- reset(other.release());
- return *this;
- }
-
- explicit operator bool() const { return event_ != WSA_INVALID_EVENT; }
- WSAEVENT get() const { return event_; }
-
- WSAEVENT release() {
- WSAEVENT ret = event_;
- event_ = WSA_INVALID_EVENT;
- return ret;
- }
-
- void reset(WSAEVENT event = WSA_INVALID_EVENT) {
- if (event_ != WSA_INVALID_EVENT) {
- WSACloseEvent(event_);
- }
- event_ = event;
- }
-
- private:
- WSAEVENT event_ = WSA_INVALID_EVENT;
- };
-
- // SocketWaiter, on Windows, is more complicated. While |WaitForMultipleObjects|
- // works for both sockets and stdin, the latter is often a line-buffered
- // console. The |HANDLE| is considered readable if there are any console events
- // available, but reading blocks until a full line is available.
- //
- // So that |Wait| reflects final stdin read, we spawn a stdin reader thread that
- // writes to an in-memory buffer and signals a |WSAEVENT| to coordinate with the
- // socket.
- class SocketWaiter {
- public:
- explicit SocketWaiter(int sock) : sock_(sock) {}
- SocketWaiter(const SocketWaiter &) = delete;
- SocketWaiter &operator=(const SocketWaiter &) = delete;
-
- bool Init() {
- stdin_ = std::make_shared<StdinState>();
- stdin_->event.reset(WSACreateEvent());
- if (!stdin_->event) {
- PrintSocketError("Error in WSACreateEvent");
- return false;
- }
-
- // Spawn a thread to block on stdin.
- std::shared_ptr<StdinState> state = stdin_;
- std::thread thread([state]() {
- for (;;) {
- uint8_t buf[512];
- int ret = _read(0 /* stdin */, buf, sizeof(buf));
- if (ret <= 0) {
- if (ret < 0) {
- perror("read from stdin");
- }
- // Report the error or EOF to the caller.
- std::lock_guard<std::mutex> lock(state->lock);
- state->error = ret < 0;
- state->open = false;
- WSASetEvent(state->event.get());
- return;
- }
-
- size_t len = static_cast<size_t>(ret);
- size_t written = 0;
- while (written < len) {
- std::unique_lock<std::mutex> lock(state->lock);
- // Wait for there to be room in the buffer.
- state->cond.wait(lock, [&] { return !state->buffer_full(); });
-
- // Copy what we can and signal to the caller.
- size_t todo = std::min(len - written, state->buffer_remaining());
- state->buffer.insert(state->buffer.end(), buf + written,
- buf + written + todo);
- written += todo;
- WSASetEvent(state->event.get());
- }
- }
- });
- thread.detach();
- return true;
- }
-
- bool Wait(StdinWait stdin_wait, bool *socket_ready, bool *stdin_ready) {
- *socket_ready = true;
- *stdin_ready = false;
-
- ScopedWSAEVENT sock_read_event(WSACreateEvent());
- if (!sock_read_event ||
- WSAEventSelect(sock_, sock_read_event.get(), FD_READ | FD_CLOSE) != 0) {
- PrintSocketError("Error waiting for socket read");
- return false;
- }
-
- DWORD count = 1;
- WSAEVENT events[3] = {sock_read_event.get(), WSA_INVALID_EVENT};
- ScopedWSAEVENT sock_write_event;
- if (stdin_wait == StdinWait::kSocketWrite) {
- sock_write_event.reset(WSACreateEvent());
- if (!sock_write_event || WSAEventSelect(sock_, sock_write_event.get(),
- FD_WRITE | FD_CLOSE) != 0) {
- PrintSocketError("Error waiting for socket write");
- return false;
- }
- events[1] = sock_write_event.get();
- count++;
- } else if (listen_stdin_) {
- events[1] = stdin_->event.get();
- count++;
- }
-
- switch (WSAWaitForMultipleEvents(count, events, FALSE /* wait all */,
- WSA_INFINITE, FALSE /* alertable */)) {
- case WSA_WAIT_EVENT_0 + 0:
- *socket_ready = true;
- return true;
- case WSA_WAIT_EVENT_0 + 1:
- *stdin_ready = true;
- return true;
- case WSA_WAIT_TIMEOUT:
- return true;
- default:
- PrintSocketError("Error waiting for events");
- return false;
- }
- }
-
- bool ReadStdin(void *out, size_t *out_len, size_t max_out) {
- std::lock_guard<std::mutex> locked(stdin_->lock);
-
- if (stdin_->buffer.empty()) {
- // |ReadStdin| may only be called when |Wait| signals it is ready, so
- // stdin must have reached EOF or error.
- assert(!stdin_->open);
- listen_stdin_ = false;
- if (stdin_->error) {
- return false;
- }
- *out_len = 0;
- return true;
- }
-
- bool was_full = stdin_->buffer_full();
- // Copy as many bytes as well fit.
- *out_len = std::min(max_out, stdin_->buffer.size());
- auto begin = stdin_->buffer.begin();
- auto end = stdin_->buffer.begin() + *out_len;
- std::copy(begin, end, static_cast<uint8_t *>(out));
- stdin_->buffer.erase(begin, end);
- // Notify the stdin thread if there is more space.
- if (was_full && !stdin_->buffer_full()) {
- stdin_->cond.notify_one();
- }
- // If stdin is now waiting for input, clear the event.
- if (stdin_->buffer.empty() && stdin_->open) {
- WSAResetEvent(stdin_->event.get());
- }
- return true;
- }
-
- private:
- struct StdinState {
- static constexpr size_t kMaxBuffer = 1024;
-
- StdinState() = default;
- StdinState(const StdinState &) = delete;
- StdinState &operator=(const StdinState &) = delete;
-
- size_t buffer_remaining() const { return kMaxBuffer - buffer.size(); }
- bool buffer_full() const { return buffer_remaining() == 0; }
-
- ScopedWSAEVENT event;
- // lock protects the following fields.
- std::mutex lock;
- // cond notifies the stdin thread that |buffer| is no longer full.
- std::condition_variable cond;
- std::deque<uint8_t> buffer;
- bool open = true;
- bool error = false;
- };
-
- int sock_;
- std::shared_ptr<StdinState> stdin_;
- // listen_stdin_ is set to false when we have consumed an EOF or error from
- // |stdin_|. This is separate from |stdin_->open| because the signal may not
- // have been consumed yet.
- bool listen_stdin_ = true;
- };
-
- #endif // OPENSSL_WINDOWS
-
- void PrintSSLError(FILE *file, const char *msg, int ssl_err, int ret) {
- switch (ssl_err) {
- case SSL_ERROR_SSL:
- fprintf(file, "%s: %s\n", msg, ERR_reason_error_string(ERR_peek_error()));
- break;
- case SSL_ERROR_SYSCALL:
- if (ret == 0) {
- fprintf(file, "%s: peer closed connection\n", msg);
- } else {
- std::string error = GetLastSocketErrorString();
- fprintf(file, "%s: %s\n", msg, error.c_str());
- }
- break;
- case SSL_ERROR_ZERO_RETURN:
- fprintf(file, "%s: received close_notify\n", msg);
- break;
- default:
- fprintf(file, "%s: unknown error type (%d)\n", msg, ssl_err);
- }
- ERR_print_errors_fp(file);
- }
-
- bool TransferData(SSL *ssl, int sock) {
- if (!SocketSetNonBlocking(sock, true)) {
- return false;
- }
-
- SocketWaiter waiter(sock);
- if (!waiter.Init()) {
- return false;
- }
-
- uint8_t pending_write[512];
- size_t pending_write_len = 0;
- for (;;) {
- bool socket_ready = false;
- bool stdin_ready = false;
- if (!waiter.Wait(pending_write_len == 0 ? StdinWait::kStdinRead
- : StdinWait::kSocketWrite,
- &socket_ready, &stdin_ready)) {
- return false;
- }
-
- if (stdin_ready) {
- if (pending_write_len == 0) {
- if (!waiter.ReadStdin(pending_write, &pending_write_len,
- sizeof(pending_write))) {
- return false;
- }
- if (pending_write_len == 0) {
- #if !defined(OPENSSL_WINDOWS)
- shutdown(sock, SHUT_WR);
- #else
- shutdown(sock, SD_SEND);
- #endif
- continue;
- }
- }
-
- int ssl_ret =
- SSL_write(ssl, pending_write, static_cast<int>(pending_write_len));
- if (ssl_ret <= 0) {
- int ssl_err = SSL_get_error(ssl, ssl_ret);
- if (ssl_err == SSL_ERROR_WANT_WRITE) {
- continue;
- }
- PrintSSLError(stderr, "Error while writing", ssl_err, ssl_ret);
- return false;
- }
- if (ssl_ret != static_cast<int>(pending_write_len)) {
- fprintf(stderr, "Short write from SSL_write.\n");
- return false;
- }
- pending_write_len = 0;
- }
-
- if (socket_ready) {
- for (;;) {
- 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) {
- break;
- }
- PrintSSLError(stderr, "Error while reading", ssl_err, ssl_ret);
- return false;
- } else if (ssl_ret == 0) {
- return true;
- }
-
- ssize_t n;
- do {
- n = BORINGSSL_WRITE(1, buffer, ssl_ret);
- } while (n == -1 && errno == EINTR);
-
- if (n != ssl_ret) {
- fprintf(stderr, "Short write to stderr.\n");
- return false;
- }
- }
- }
- }
- }
-
- // SocketLineReader wraps a small buffer around a socket for line-orientated
- // protocols.
- class SocketLineReader {
- public:
- explicit SocketLineReader(int sock) : sock_(sock) {}
-
- // Next reads a '\n'- or '\r\n'-terminated line from the socket and, on
- // success, sets |*out_line| to it and returns true. Otherwise it returns
- // false.
- bool Next(std::string *out_line) {
- for (;;) {
- for (size_t i = 0; i < buf_len_; i++) {
- if (buf_[i] != '\n') {
- continue;
- }
-
- size_t length = i;
- if (i > 0 && buf_[i - 1] == '\r') {
- length--;
- }
-
- out_line->assign(buf_, length);
- buf_len_ -= i + 1;
- OPENSSL_memmove(buf_, &buf_[i + 1], buf_len_);
-
- return true;
- }
-
- if (buf_len_ == sizeof(buf_)) {
- fprintf(stderr, "Received line too long!\n");
- return false;
- }
-
- ssize_t n;
- do {
- n = recv(sock_, &buf_[buf_len_], sizeof(buf_) - buf_len_, 0);
- } while (n == -1 && errno == EINTR);
-
- if (n < 0) {
- fprintf(stderr, "Read error from socket\n");
- return false;
- }
-
- buf_len_ += n;
- }
- }
-
- // ReadSMTPReply reads one or more lines that make up an SMTP reply. On
- // success, it sets |*out_code| to the reply's code (e.g. 250) and
- // |*out_content| to the body of the reply (e.g. "OK") and returns true.
- // Otherwise it returns false.
- //
- // See https://tools.ietf.org/html/rfc821#page-48
- bool ReadSMTPReply(unsigned *out_code, std::string *out_content) {
- out_content->clear();
-
- // kMaxLines is the maximum number of lines that we'll accept in an SMTP
- // reply.
- static const unsigned kMaxLines = 512;
- for (unsigned i = 0; i < kMaxLines; i++) {
- std::string line;
- if (!Next(&line)) {
- return false;
- }
-
- if (line.size() < 4) {
- fprintf(stderr, "Short line from SMTP server: %s\n", line.c_str());
- return false;
- }
-
- const std::string code_str = line.substr(0, 3);
- char *endptr;
- const unsigned long code = strtoul(code_str.c_str(), &endptr, 10);
- if (*endptr || code > UINT_MAX) {
- fprintf(stderr, "Failed to parse code from line: %s\n", line.c_str());
- return false;
- }
-
- if (i == 0) {
- *out_code = code;
- } else if (code != *out_code) {
- fprintf(stderr,
- "Reply code varied within a single reply: was %u, now %u\n",
- *out_code, static_cast<unsigned>(code));
- return false;
- }
-
- if (line[3] == ' ') {
- // End of reply.
- *out_content += line.substr(4, std::string::npos);
- return true;
- } else if (line[3] == '-') {
- // Another line of reply will follow this one.
- *out_content += line.substr(4, std::string::npos);
- out_content->push_back('\n');
- } else {
- fprintf(stderr, "Bad character after code in SMTP reply: %s\n",
- line.c_str());
- return false;
- }
- }
-
- fprintf(stderr, "Rejected SMTP reply of more then %u lines\n", kMaxLines);
- return false;
- }
-
- private:
- const int sock_;
- char buf_[512];
- size_t buf_len_ = 0;
- };
-
- // SendAll writes |data_len| bytes from |data| to |sock|. It returns true on
- // success and false otherwise.
- static bool SendAll(int sock, const char *data, size_t data_len) {
- size_t done = 0;
-
- while (done < data_len) {
- ssize_t n;
- do {
- n = send(sock, &data[done], data_len - done, 0);
- } while (n == -1 && errno == EINTR);
-
- if (n < 0) {
- fprintf(stderr, "Error while writing to socket\n");
- return false;
- }
-
- done += n;
- }
-
- return true;
- }
-
- bool DoSMTPStartTLS(int sock) {
- SocketLineReader line_reader(sock);
-
- unsigned code_220 = 0;
- std::string reply_220;
- if (!line_reader.ReadSMTPReply(&code_220, &reply_220)) {
- return false;
- }
-
- if (code_220 != 220) {
- fprintf(stderr, "Expected 220 line from SMTP server but got code %u\n",
- code_220);
- return false;
- }
-
- static const char kHelloLine[] = "EHLO BoringSSL\r\n";
- if (!SendAll(sock, kHelloLine, sizeof(kHelloLine) - 1)) {
- return false;
- }
-
- unsigned code_250 = 0;
- std::string reply_250;
- if (!line_reader.ReadSMTPReply(&code_250, &reply_250)) {
- return false;
- }
-
- if (code_250 != 250) {
- fprintf(stderr, "Expected 250 line after EHLO but got code %u\n", code_250);
- return false;
- }
-
- // https://tools.ietf.org/html/rfc1869#section-4.3
- if (("\n" + reply_250 + "\n").find("\nSTARTTLS\n") == std::string::npos) {
- fprintf(stderr, "Server does not support STARTTLS\n");
- return false;
- }
-
- static const char kSTARTTLSLine[] = "STARTTLS\r\n";
- if (!SendAll(sock, kSTARTTLSLine, sizeof(kSTARTTLSLine) - 1)) {
- return false;
- }
-
- if (!line_reader.ReadSMTPReply(&code_220, &reply_220)) {
- return false;
- }
-
- if (code_220 != 220) {
- fprintf(
- stderr,
- "Expected 220 line from SMTP server after STARTTLS, but got code %u\n",
- code_220);
- return false;
- }
-
- return true;
- }
-
- bool DoHTTPTunnel(int sock, const std::string &hostname_and_port) {
- std::string hostname, port;
- SplitHostPort(&hostname, &port, hostname_and_port);
-
- fprintf(stderr, "Establishing HTTP tunnel to %s:%s.\n", hostname.c_str(),
- port.c_str());
- char buf[1024];
- snprintf(buf, sizeof(buf), "CONNECT %s:%s HTTP/1.0\r\n\r\n", hostname.c_str(),
- port.c_str());
- if (!SendAll(sock, buf, strlen(buf))) {
- return false;
- }
-
- SocketLineReader line_reader(sock);
-
- // Read until an empty line, signaling the end of the HTTP response.
- std::string line;
- for (;;) {
- if (!line_reader.Next(&line)) {
- return false;
- }
- if (line.empty()) {
- return true;
- }
- fprintf(stderr, "%s\n", line.c_str());
- }
- }
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