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wolfssl-examples/dtls/client-dtls-callback.c

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/*
* client-dtls-callback.c
*
* Copyright (C) 2006-2015 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL 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.
*
* wolfSSL 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
*
*=============================================================================
*
* Bare-bones example of a DTLS client for instructional/learning purposes.
*/
#include <wolfssl/options.h>
#include <unistd.h>
#include <wolfssl/ssl.h>
#include <netdb.h>
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXLINE 4096
#define SERV_PORT 11111
typedef struct SharedDtls {
WOLFSSL* ssl; /* WOLFSSL object being shared */
int sd; /* socket fd */
struct sockaddr_in servAddr; /* server sockaddr */
socklen_t servSz; /* length of servAddr */
char* recvBuf; /* I/O recv cb buffer */
int recvSz; /* bytes in recvBuf */
int handShakeDone; /* is the handshake done? */
} SharedDtls;
int my_IORecv(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
SharedDtls* shared = (SharedDtls*)ctx;
int recvd;
printf("my_IORecv sz %d\n", sz);
/* Receive message from socket */
recvd = recvfrom(shared->sd, buff, sz, 0, NULL, NULL);
if (recvd == -1) {
/* error encountered. Be responsible and report it in wolfSSL terms */
fprintf(stderr, "IO RECEIVE ERROR: ");
switch (errno) {
#if EAGAIN != EWOULDBLOCK
case EAGAIN: /* EAGAIN == EWOULDBLOCK on some systems, but not others */
#endif
case EWOULDBLOCK:
if (!wolfSSL_dtls(ssl) || wolfSSL_get_using_nonblock(ssl)) {
fprintf(stderr, "would block\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
}
else {
fprintf(stderr, "socket timeout\n");
return WOLFSSL_CBIO_ERR_TIMEOUT;
}
case ECONNRESET:
fprintf(stderr, "connection reset\n");
return WOLFSSL_CBIO_ERR_CONN_RST;
case EINTR:
fprintf(stderr, "socket interrupted\n");
return WOLFSSL_CBIO_ERR_ISR;
case ECONNREFUSED:
fprintf(stderr, "connection refused\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
case ECONNABORTED:
fprintf(stderr, "connection aborted\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
default:
fprintf(stderr, "general error\n");
return WOLFSSL_CBIO_ERR_GENERAL;
}
}
else if (recvd == 0) {
printf("Connection closed\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
}
printf("my_IORecv recvd %d \n", recvd);
/* successful receive */
printf("my_IORecv: received %d bytes from %d\n", sz, shared->sd);
return recvd;
}
int my_IOSend(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
SharedDtls* shared = (SharedDtls*)ctx;
int sent;
printf("my_IOSend sz %d\n", sz);
sent = sendto(shared->sd, buff, sz, 0,
(const struct sockaddr*)&shared->servAddr, shared->servSz);
/* Send message to socket */
if (sent == -1) {
/* error encountered. Be responsible and report it in wolfSSL terms */
fprintf(stderr, "IO SEND ERROR: ");
switch (errno) {
#if EAGAIN != EWOULDBLOCK
case EAGAIN: /* EAGAIN == EWOULDBLOCK on some systems, but not others */
#endif
case EWOULDBLOCK:
fprintf(stderr, "would block\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
case ECONNRESET:
fprintf(stderr, "connection reset\n");
return WOLFSSL_CBIO_ERR_CONN_RST;
case EINTR:
fprintf(stderr, "socket interrupted\n");
return WOLFSSL_CBIO_ERR_ISR;
case EPIPE:
fprintf(stderr, "socket EPIPE\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
default:
fprintf(stderr, "general error\n");
return WOLFSSL_CBIO_ERR_GENERAL;
}
}
else if (sent == 0) {
printf("Connection closed\n");
return 0;
}
printf("my_IOSend sent %d\n", sent);
/* successful send */
printf("my_IOSend: sent %d bytes to %d\n", sz, shared->sd);
return sent;
}
int main (int argc, char** argv)
{
/* standard variables used in a dtls client*/
int n = 0;
int sockfd = 0;
int err1;
int readErr;
//struct sockaddr_in servAddr;
WOLFSSL* ssl = 0;
WOLFSSL_CTX* ctx = 0;
char cert_array[] = "../certs/ca-cert.pem";
char* certs = cert_array;
char sendLine[MAXLINE];
char recvLine[MAXLINE - 1];
SharedDtls shared;
/* Program argument checking */
if (argc != 2) {
printf("usage: udpcli <IP address>\n");
return 1;
}
wolfSSL_Debugging_ON();
/* Initialize wolfSSL before assigning ctx */
wolfSSL_Init();
if ( (ctx = wolfSSL_CTX_new(wolfDTLSv1_2_client_method())) == NULL) {
fprintf(stderr, "wolfSSL_CTX_new error.\n");
return 1;
}
/* Register callbacks */
wolfSSL_CTX_SetIORecv(ctx, my_IORecv);
wolfSSL_CTX_SetIOSend(ctx, my_IOSend);
/* Load certificates into ctx variable */
if (wolfSSL_CTX_load_verify_locations(ctx, certs, 0)
!= SSL_SUCCESS) {
fprintf(stderr, "Error loading %s, please check the file.\n", certs);
return 1;
}
/* Assign ssl variable */
ssl = wolfSSL_new(ctx);
if (ssl == NULL) {
printf("unable to get ssl object");
return 1;
}
/* servAddr setup */
memset(&shared.servAddr, 0, sizeof(shared.servAddr));
shared.servAddr.sin_family = AF_INET;
shared.servAddr.sin_port = htons(SERV_PORT);
if (inet_pton(AF_INET, argv[1], &shared.servAddr.sin_addr) < 1) {
printf("Error and/or invalid IP address");
return 1;
}
if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
printf("cannot create a socket.");
return 1;
}
shared.sd = sockfd;
shared.servSz = sizeof(shared.servAddr);
shared.ssl = ssl;
shared.handShakeDone = 0;
wolfSSL_SetIOWriteCtx(ssl, &shared);
wolfSSL_SetIOReadCtx(ssl, &shared);
//wolfSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr));
/* Set the file descriptor for ssl and connect with ssl variable */
//wolfSSL_set_fd(ssl, sockfd);
if (wolfSSL_connect(ssl) != SSL_SUCCESS) {
err1 = wolfSSL_get_error(ssl, 0);
printf("err = %d, %s\n", err1, wolfSSL_ERR_reason_error_string(err1));
printf("SSL_connect failed");
return 1;
}
/*****************************************************************************/
/* Code for sending datagram to server */
/* Loop until the user is finished */
while (fgets(sendLine, MAXLINE, stdin) != NULL) {
/* Send sendLine to the server */
if ( ( wolfSSL_write(ssl, sendLine, strlen(sendLine)))
!= strlen(sendLine)) {
printf("SSL_write failed");
}
/* n is the # of bytes received */
n = wolfSSL_read(ssl, recvLine, sizeof(recvLine)-1);
if (n < 0) {
readErr = wolfSSL_get_error(ssl, 0);
if (readErr != SSL_ERROR_WANT_READ) {
printf("wolfSSL_read failed");
}
}
/* Add a terminating character to the generic server message */
recvLine[n] = '\0';
fputs(recvLine, stdout);
}
/* End code for sending datagram to server */
/*****************************************************************************/
/* Housekeeping */
wolfSSL_shutdown(ssl);
wolfSSL_free(ssl);
close(sockfd);
wolfSSL_CTX_free(ctx);
wolfSSL_Cleanup();
return 0;
}
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