David Garske
GitHub
commit
3ee1225bb0
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# PicoTCP Example Makefile
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CC = gcc
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LIB_PATH = /usr/local
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PICOTCP_PATH = ../../picotcp
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CFLAGS = -Wall -I$(LIB_PATH)/include -I$(PICOTCP_PATH)/build/include
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LIBS = -L$(LIB_PATH)/lib -lm -pthread
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# option variables
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DYN_LIB = -lwolfssl
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STATIC_LIB = $(PICOTCP_PATH)/build/lib/libpicotcp.a
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DEBUG_FLAGS = -g -DDEBUG
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DEBUG_INC_PATHS = -MD
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SILENCE_FLAGS = -Wno-address-of-packed-member -Wno-discarded-qualifiers
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OPTIMIZE = -Os
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# Options
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#CFLAGS+=$(DEBUG_FLAGS)
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CFLAGS+=$(OPTIMIZE)
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CFLAGS+=$(SILENCE_FLAGS)
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LIBS+=$(STATIC_LIB) $(DYN_LIB)
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# build targets
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SRC=$(wildcard *.c)
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TARGETS=$(patsubst %.c, %, $(SRC))
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# OS / CPU Detection
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OS_DET=UNKNOWN
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CPU_DET=UNKNOWN
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ifeq ($(OS),Windows_NT)
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OS_DET=WIN32
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ifeq ($(PROCESSOR_ARCHITEW6432),AMD64)
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CPU_DET=AMD64
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else
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ifeq ($(PROCESSOR_ARCHITECTURE),AMD64)
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CPU_DET=AMD64
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endif
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ifeq ($(PROCESSOR_ARCHITECTURE),x86)
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CPU_DET=IA32
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endif
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endif
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else
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UNAME_S := $(shell uname -s)
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ifeq ($(UNAME_S),Linux)
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OS_DET=LINUX
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endif
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ifeq ($(UNAME_S),Darwin)
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OS_DET=OSX
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endif
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UNAME_P := $(shell uname -p)
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ifeq ($(UNAME_P),x86_64)
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CPU_DET=AMD64
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endif
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ifneq ($(filter %86,$(UNAME_P)),)
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CPU_DET=IA32
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endif
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ifneq ($(filter arm%,$(UNAME_P)),)
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CPU_DET=ARM
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endif
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endif
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.PHONY: clean all
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all: $(TARGETS)
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debug: CFLAGS+=$(DEBUG_FLAGS)
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debug: all
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# build template
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%: %.c
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$(CC) -o $@ $< $(CFLAGS) $(LIBS)
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clean:
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rm -f $(TARGETS)
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## TLS server using picoTCP via wolfSSL custom callbacks
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This TLS server runs in userspace, using picoTCP as compiled-in TCP/IP stack.
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`picotcp-server` has been tested on Linux using latest picoTCP master, and wolfSSL 4.5.0.
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### Requirements
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- PicoTCP v.1.7 or later
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- wolfSSL
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- Access to `/dev/net/tun` on the host system (typically root privileges)
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### How to compile picotcp-server
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- clone or download picoTCP
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- compile picoTCP with `make ARCH=shared TAP=1 WOLFSSL=1`
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- modify `PICOTCP_PATH` at the top of Makefile, pointing to the picoTCP root directory
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- run `make`
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### Testing picotcp-server
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Run `picotcp-server` with no arguments. If the executable was run with the right permissions (i.e. accessing `/dev/net/tun`), a `tap0` device will be created, and the picoTCP endpoint address is set to `10.0.0.1/24`.
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The TLS server listens to port 11111 by default, and can be reached using the [TLS client example](../tls/client-tls.c).
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Example:
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```(bash)
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# Server side:
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./picotcp-server
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# On client side:
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ip addr add dev tap0 10.0.0.2/24
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ip link set tap0 up
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./client-tls 10.0.0.1
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```
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/* picotcp-server.c
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*
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* Copyright (C) 2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* the usual suspects */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* wolfSSL */
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#include <wolfssl/options.h>
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#include <wolfssl/ssl.h>
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/* PicoTCP */
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#include <pico_stack.h>
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#include <pico_socket.h>
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#include <pico_dev_tap.h>
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/* Pthreads */
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#include <pthread.h>
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/* Semaphore */
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#include <semaphore.h>
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#define DEFAULT_PORT 11111
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#define CERT_FILE "../certs/server-cert.pem"
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#define KEY_FILE "../certs/server-key.pem"
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/* Global picotcp client socket object */
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static volatile struct pico_socket *conn = NULL;
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sem_t picotcp_rx_data;
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/* PicoTCP send/receive callbacks */
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int pico_send(struct WOLFSSL *ssl, char *buf, int len, void *ctx)
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{
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struct pico_socket *s = (struct pico_socket *)ctx;
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int r;
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r = pico_socket_write(s, buf, len);
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if (r > 0)
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return r;
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else
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return WOLFSSL_CBIO_ERR_WANT_WRITE;
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}
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int pico_recv(struct WOLFSSL *ssl, char *buf, int len, void *ctx)
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{
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struct pico_socket *s = (struct pico_socket *)ctx;
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int r;
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r = pico_socket_read(s, buf, len);
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if (r > 0)
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return r;
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else
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return WOLFSSL_CBIO_ERR_WANT_READ;
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}
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/* PicoTCP: socket callback */
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static void socket_cb(uint16_t ev, struct pico_socket *s)
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{
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struct pico_ip4 client_addr;
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uint16_t client_port;
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if (ev & PICO_SOCK_EV_CONN) {
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conn = pico_socket_accept(s, &client_addr, &client_port);
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return;
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}
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if (ev & PICO_SOCK_EV_RD) {
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sem_post(&picotcp_rx_data);
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}
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}
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/* PicoTCP: tick thread */
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static volatile int picotick_terminated = 0;
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static void *picotick_thread (void *arg) {
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printf("PicoTCP thread: started.\n");
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while(1) {
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pico_stack_tick();
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if ((usleep(2000) > 0) || picotick_terminated) {
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fprintf(stderr, "picotick_thread: Goodbye!\n");
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pthread_exit(NULL);
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}
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}
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}
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int main()
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{
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char buff[256];
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size_t len;
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int shutdown = 0;
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int ret;
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const char* reply = "I hear ya fa shizzle!\n";
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const char* tap_ipaddr = "10.0.0.1";
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const char* tap_netmask = "255.255.255.0";
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struct pico_device *dev;
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struct pico_ip4 dev_tap_ipaddr, dev_tap_netmask, in_addr_any, client_addr;
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uint16_t listen_port = short_be(DEFAULT_PORT), client_port;
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struct pico_socket *pico_s;
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pthread_t pico_tick_thread;
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WOLFSSL_CTX* ctx;
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WOLFSSL* ssl;
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/* Initialize picoTCP */
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pico_stack_init();
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dev = pico_tap_create("tap0");
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if (!dev) {
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fprintf(stderr, "ERROR: Failed to create picoTCP tap device: %s\n", strerror(errno));
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return -1;
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}
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/* Convert IP address + netmask from text to ip4 */
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pico_string_to_ipv4(tap_ipaddr, &dev_tap_ipaddr.addr);
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pico_string_to_ipv4(tap_netmask, &dev_tap_netmask.addr);
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memset(&in_addr_any, 0, sizeof(struct pico_ip4));
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/* Add ipv4 link to tap interface */
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pico_ipv4_link_add(dev, dev_tap_ipaddr, dev_tap_netmask);
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/* Initialize semaphore */
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sem_init(&picotcp_rx_data, 1, 0);
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/* Start picoTCP ticking thread */
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pthread_create(&pico_tick_thread, NULL, picotick_thread, NULL);
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/* Initialize wolfSSL */
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wolfSSL_Init();
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/* Create a socket that uses an internet IPv4 address,
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* Set the socket to be stream based (TCP),
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* associate to picoTCP socket callback */
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pico_s = pico_socket_open(PICO_PROTO_IPV4, PICO_PROTO_TCP, &socket_cb);
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if (pico_s == NULL) {
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fprintf(stderr, "ERROR: failed to create the socket\n");
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return -1;
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}
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/* Create and initialize WOLFSSL_CTX */
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if ((ctx = wolfSSL_CTX_new(wolfTLSv1_2_server_method())) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
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return -1;
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}
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/* Load server certificates into WOLFSSL_CTX */
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if (wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, SSL_FILETYPE_PEM)
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!= SSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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CERT_FILE);
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return -1;
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}
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/* Load server key into WOLFSSL_CTX */
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if (wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, SSL_FILETYPE_PEM)
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!= SSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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KEY_FILE);
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return -1;
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}
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/* Associate picoTCP callbacks to wolfSSL context */
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wolfSSL_CTX_SetIORecv(ctx, pico_recv);
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wolfSSL_CTX_SetIOSend(ctx, pico_send);
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/* Bind the server socket to our port */
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if (pico_socket_bind(pico_s, &in_addr_any, &listen_port) != 0) {
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fprintf(stderr, "ERROR: failed to bind\n");
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return -1;
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}
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/* Listen for a new connection, allow 5 pending connections */
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if (pico_socket_listen(pico_s, 5) != 0) {
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fprintf(stderr, "ERROR: failed to listen\n");
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return -1;
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}
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/* Continue to accept clients until shutdown is issued */
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while (!shutdown) {
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conn = pico_socket_accept(pico_s, &client_addr, &client_port);
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printf("Waiting for a connection...\n");
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while(!conn) {
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usleep(10000);
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}
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/* Create a WOLFSSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
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return -1;
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}
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/* Attach wolfSSL to the socket */
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/* Establish TLS connection */
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do {
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wolfSSL_SetIOReadCtx(ssl, conn);
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wolfSSL_SetIOWriteCtx(ssl, conn);
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ret = wolfSSL_accept(ssl);
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sem_wait(&picotcp_rx_data);
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} while ((ret != SSL_SUCCESS) && (wolfSSL_get_error(ssl, ret) == SSL_ERROR_WANT_READ));
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printf("Client connected successfully\n");
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/* Read the client data into our buff array */
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memset(buff, 0, sizeof(buff));
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sem_wait(&picotcp_rx_data);
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if (wolfSSL_read(ssl, buff, sizeof(buff)-1) == -1) {
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fprintf(stderr, "ERROR: failed to read\n");
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return -1;
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}
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/* Print to stdout any data the client sends */
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printf("Client: %s\n", buff);
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/* Check for server shutdown command */
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if (strncmp(buff, "shutdown", 8) == 0) {
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printf("Shutdown command issued!\n");
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shutdown = 1;
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}
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/* Write our reply into buff */
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memset(buff, 0, sizeof(buff));
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memcpy(buff, reply, strlen(reply));
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len = strnlen(buff, sizeof(buff));
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/* Reply back to the client */
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if (wolfSSL_write(ssl, buff, len) != len) {
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fprintf(stderr, "ERROR: failed to write\n");
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return -1;
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}
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/* Cleanup after this connection */
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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pico_socket_close(conn); /* Close the connection to the client */
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conn = NULL;
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}
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printf("Shutdown complete\n");
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/* Cleanup and return */
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wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
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wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
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pico_socket_close(pico_s); /* Close the socket listening for clients */
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picotick_terminated = 1; /* Send termination to picotick thread */
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pthread_join(pico_tick_thread, NULL); /* Join tick thread */
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return 0; /* Return reporting a success */
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}
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