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wolfssh/examples/echoserver/echoserver.c

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/* echoserver.c
*
* Copyright (C) 2014 wolfSSL Inc.
*
* This file is part of wolfSSH.
*
* wolfSSH 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 2 of the License, or
* (at your option) any later version.
*
* wolfSSH 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <stdio.h>
#include <pthread.h>
#include <wolfssh/ssh.h>
#ifndef SO_NOSIGPIPE
#include <signal.h>
#endif
typedef int SOCKET_T;
#ifdef TEST_IPV6
typedef struct sockaddr_in6 SOCKADDR_IN_T;
#define AF_INET_V AF_INET6
static const char* wolfsshIP = "::1";
#else
typedef struct sockaddr_in SOCKADDR_IN_T;
#define AF_INET_V AF_INET
static const char* wolfsshIP = "127.0.0.1";
#endif
#define SERVER_PORT_NUMBER 22222
#define SCRATCH_BUFFER_SIZE 1200
#if defined(__MACH__) || defined(USE_WINDOWS_API)
#ifndef _SOCKLEN_T
typedef int socklen_t;
#endif
#endif
/* HPUX doesn't use socklent_t for third parameter to accept, unless
_XOPEN_SOURCE_EXTENDED is defined */
#if !defined(__hpux__) && !defined(CYASSL_MDK_ARM) && !defined(CYASSL_IAR_ARM)
typedef socklen_t SOCKLEN_T;
#else
#if defined _XOPEN_SOURCE_EXTENDED
typedef socklen_t SOCKLEN_T;
#else
typedef int SOCKLEN_T;
#endif
#endif
#if defined(_POSIX_THREADS) && !defined(__MINGW32__)
typedef void* THREAD_RETURN;
typedef pthread_t THREAD_TYPE;
#define CYASSL_THREAD
#define INFINITE -1
#define WAIT_OBJECT_0 0L
#elif defined(CYASSL_MDK_ARM)
typedef unsigned int THREAD_RETURN;
typedef int THREAD_TYPE;
#define CYASSL_THREAD
#else
typedef unsigned int THREAD_RETURN;
typedef intptr_t THREAD_TYPE;
#define CYASSL_THREAD __stdcall
#endif
typedef struct {
SOCKET_T clientFd;
} thread_ctx_t;
static WINLINE void err_sys(const char* msg)
{
printf("server error: %s\n", msg);
if (msg)
exit(EXIT_FAILURE);
}
static WINLINE void build_addr(SOCKADDR_IN_T* addr, const char* peer,
uint16_t port)
{
int useLookup = 0;
(void)useLookup;
memset(addr, 0, sizeof(SOCKADDR_IN_T));
#ifndef TEST_IPV6
/* peer could be in human readable form */
if ( (peer != INADDR_ANY) && isalpha((int)peer[0])) {
#ifdef CYASSL_MDK_ARM
int err;
struct hostent* entry = gethostbyname(peer, &err);
#else
struct hostent* entry = gethostbyname(peer);
#endif
if (entry) {
memcpy(&addr->sin_addr.s_addr, entry->h_addr_list[0],
entry->h_length);
useLookup = 1;
}
else
err_sys("no entry for host");
}
#endif
#ifndef TEST_IPV6
#if defined(CYASSL_MDK_ARM)
addr->sin_family = PF_INET;
#else
addr->sin_family = AF_INET_V;
#endif
addr->sin_port = htons(port);
if (peer == INADDR_ANY)
addr->sin_addr.s_addr = INADDR_ANY;
else {
if (!useLookup)
addr->sin_addr.s_addr = inet_addr(peer);
}
#else
addr->sin6_family = AF_INET_V;
addr->sin6_port = htons(port);
if (peer == INADDR_ANY)
addr->sin6_addr = in6addr_any;
else {
#ifdef HAVE_GETADDRINFO
struct addrinfo hints;
struct addrinfo* answer = NULL;
int ret;
char strPort[80];
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET_V;
hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
hints.ai_protocol = udp ? IPPROTO_UDP : IPPROTO_TCP;
SNPRINTF(strPort, sizeof(strPort), "%d", port);
strPort[79] = '\0';
ret = getaddrinfo(peer, strPort, &hints, &answer);
if (ret < 0 || answer == NULL)
err_sys("getaddrinfo failed");
memcpy(addr, answer->ai_addr, answer->ai_addrlen);
freeaddrinfo(answer);
#else
printf("no ipv6 getaddrinfo, loopback only tests/examples\n");
addr->sin6_addr = in6addr_loopback;
#endif
}
#endif
}
static WINLINE void tcp_socket(SOCKET_T* sockFd)
{
*sockFd = socket(AF_INET_V, SOCK_STREAM, 0);
#ifdef USE_WINDOWS_API
if (*sockFd == INVALID_SOCKET)
err_sys("socket failed\n");
#else
if (*sockFd < 0)
err_sys("socket failed\n");
#endif
#ifndef USE_WINDOWS_API
#ifdef SO_NOSIGPIPE
{
int on = 1;
socklen_t len = sizeof(on);
int res = setsockopt(*sockFd, SOL_SOCKET, SO_NOSIGPIPE, &on, len);
if (res < 0)
err_sys("setsockopt SO_NOSIGPIPE failed\n");
}
#elif defined(CYASSL_MDK_ARM)
/* nothing to define */
#else /* no S_NOSIGPIPE */
signal(SIGPIPE, SIG_IGN);
#endif /* S_NOSIGPIPE */
#if defined(TCP_NODELAY)
{
int on = 1;
socklen_t len = sizeof(on);
int res = setsockopt(*sockFd, IPPROTO_TCP, TCP_NODELAY, &on, len);
if (res < 0)
err_sys("setsockopt TCP_NODELAY failed\n");
}
#endif
#endif /* USE_WINDOWS_API */
}
static WINLINE void tcp_bind(SOCKET_T* sockFd, uint16_t port, int useAnyAddr)
{
SOCKADDR_IN_T addr;
/* don't use INADDR_ANY by default, firewall may block, make user switch
on */
build_addr(&addr, (useAnyAddr ? INADDR_ANY : wolfsshIP), port);
tcp_socket(sockFd);
#if !defined(USE_WINDOWS_API) && !defined(CYASSL_MDK_ARM)
{
int res, on = 1;
socklen_t len = sizeof(on);
res = setsockopt(*sockFd, SOL_SOCKET, SO_REUSEADDR, &on, len);
if (res < 0)
err_sys("setsockopt SO_REUSEADDR failed\n");
}
#endif
if (bind(*sockFd, (const struct sockaddr*)&addr, sizeof(addr)) != 0)
err_sys("tcp bind failed");
}
static THREAD_RETURN CYASSL_THREAD server_worker(void* vArgs)
{
WOLFSSH* ssh = (WOLFSSH*)vArgs;
SOCKET_T clientFd = wolfSSH_get_fd(ssh);
char buf[4096];
int bufSz;
if (wolfSSH_accept(ssh) == WS_SUCCESS) {
while (1) {
bufSz = wolfSSH_stream_read(ssh, (uint8_t*)buf, sizeof(buf));
if (bufSz > 0) {
wolfSSH_stream_send(ssh, (uint8_t*)buf, bufSz);
}
else {
printf("wolfSSH_stream_read returned %d\n", bufSz);
break;
}
}
}
close(clientFd);
wolfSSH_free(ssh);
return 0;
}
static int load_file(const char* fileName, uint8_t* buf, uint32_t bufSz)
{
FILE* file;
uint32_t fileSz;
uint32_t readSz;
if (fileName == NULL) return 0;
file = fopen(fileName, "rb");
if (file == NULL) return 0;
fseek(file, 0, SEEK_END);
fileSz = (uint32_t)ftell(file);
rewind(file);
if (fileSz > bufSz) {
fclose(file);
return 0;
}
readSz = (uint32_t)fread(buf, 1, fileSz, file);
if (readSz < fileSz) {
fclose(file);
return 0;
}
return fileSz;
}
int main(void)
{
WOLFSSH_CTX* ctx = NULL;
SOCKET_T listenFd = 0;
#ifdef DEBUG_WOLFSSH
wolfSSH_Debugging_ON();
#endif
if (wolfSSH_Init() != WS_SUCCESS) {
fprintf(stderr, "Couldn't initialize wolfSSH.\n");
exit(EXIT_FAILURE);
}
ctx = wolfSSH_CTX_new(WOLFSSH_ENDPOINT_SERVER, NULL);
if (ctx == NULL) {
fprintf(stderr, "Couldn't allocate SSH CTX data.\n");
exit(EXIT_FAILURE);
}
{
uint8_t buf[SCRATCH_BUFFER_SIZE];
uint32_t bufSz;
bufSz = load_file("./certs/server-cert.der", buf, SCRATCH_BUFFER_SIZE);
if (bufSz == 0) {
fprintf(stderr, "Couldn't load certificate file.\n");
exit(EXIT_FAILURE);
}
if (wolfSSH_CTX_UseCert_buffer(ctx,
buf, bufSz, WOLFSSH_FORMAT_ASN1) < 0) {
fprintf(stderr, "Couldn't use certificate buffer.\n");
exit(EXIT_FAILURE);
}
bufSz = load_file("./certs/server-key.der", buf, SCRATCH_BUFFER_SIZE);
if (bufSz == 0) {
fprintf(stderr, "Couldn't load key file.\n");
exit(EXIT_FAILURE);
}
if (wolfSSH_CTX_UsePrivateKey_buffer(ctx,
buf, bufSz, WOLFSSH_FORMAT_ASN1) < 0) {
fprintf(stderr, "Couldn't use key buffer.\n");
exit(EXIT_FAILURE);
}
}
tcp_bind(&listenFd, SERVER_PORT_NUMBER, 0);
for (;;) {
SOCKET_T clientFd = 0;
SOCKADDR_IN_T clientAddr;
SOCKLEN_T clientAddrSz = sizeof(clientAddr);
THREAD_TYPE thread;
WOLFSSH* ssh;
ssh = wolfSSH_new(ctx);
if (ssh == NULL) {
fprintf(stderr, "Couldn't allocate SSH data.\n");
exit(EXIT_FAILURE);
}
if (listen(listenFd, 5) != 0)
err_sys("tcp listen failed");
clientFd = accept(listenFd, (struct sockaddr*)&clientAddr,
&clientAddrSz);
if (clientFd == -1)
err_sys("tcp accept failed");
wolfSSH_set_fd(ssh, clientFd);
pthread_create(&thread, 0, server_worker, ssh);
pthread_detach(thread);
}
if (wolfSSH_Cleanup() != WS_SUCCESS) {
fprintf(stderr, "Couldn't clean up wolfSSH.\n");
exit(EXIT_FAILURE);
}
return 0;
}
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