blob: eb8d16e22326443980cdc32305e1209df10155d9 [file] [log] [blame]
/* 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 <sys/types.h>
#include <sys/socket.h>
#if !defined(OPENSSL_WINDOWS)
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.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"
static const struct argument kArguments[] = {
{
"-connect", true,
"The hostname and port of the server to connect to, e.g. foo.com:443",
},
{
"", false, "",
},
};
// 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;
if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
PrintUsage(kArguments);
return false;
}
SSL_CTX *ctx = SSL_CTX_new(SSLv23_client_method());
int sock;
if (!Connect(&sock, args_map["-connect"])) {
return false;
}
BIO *bio = BIO_new_socket(sock, BIO_CLOSE);
SSL *ssl = SSL_new(ctx);
SSL_set_bio(ssl, bio, bio);
int ret = SSL_connect(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;
}