DTLS: Add server single socket demultiplexing example

dtls/client-dtls-cid.c

@@ -0,0 +1,168 @@
+/*
+ * client-dtls.c
+ *
+ * Copyright (C) 2006-2020 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
+ *
+ *=============================================================================
+ *
+ * Example of DTLS client sending data from a changing socket using
+ * Connection ID. The client's socket is reset after every message sent so each
+ * new datagram is sent from a different port.
+ */
+
+#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
+
+
+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];
+
+    /* Program argument checking */
+    if (argc != 2) {
+        printf("usage: %s <IP address>\n", argv[0]);
+        return 1;
+    }
+
+    /* Initialize wolfSSL before assigning ctx */
+    wolfSSL_Init();
+
+    /* wolfSSL_Debugging_ON(); */
+
+    if ( (ctx = wolfSSL_CTX_new(wolfDTLSv1_2_client_method())) == NULL) {
+        fprintf(stderr, "wolfSSL_CTX_new error.\n");
+        return 1;
+    }
+
+    /* 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(&servAddr, 0, sizeof(servAddr));
+    servAddr.sin_family = AF_INET;
+    servAddr.sin_port = htons(SERV_PORT);
+    if (inet_pton(AF_INET, argv[1], &servAddr.sin_addr) < 1) {
+        printf("Error and/or invalid IP address");
+        return 1;
+    }
+
+    if (wolfSSL_dtls_cid_use(ssl) != SSL_SUCCESS) {
+        fprintf(stderr, "wolfSSL_dtls_cid_use error.\n");
+        return 1;
+    }
+    if (wolfSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr)) != SSL_SUCCESS) {
+        fprintf(stderr, "wolfSSL_dtls_set_peer error.\n");
+        return 1;
+    }
+
+    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+       printf("cannot create a socket.");
+       return 1;
+    }
+
+    /* 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) {
+        if (strncmp(sendLine, "exit", strlen("exit")) == 0)
+            break;
+
+        /* 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);
+
+        close(sockfd);
+        if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+           printf("cannot create a socket.");
+           return 1;
+        }
+        /* Set the file descriptor for ssl and connect with ssl variable */
+        wolfSSL_set_fd(ssl, sockfd);
+    }
+/*                End code for sending datagram to server                    */
+/*****************************************************************************/
+
+    /* Housekeeping */
+    wolfSSL_shutdown(ssl);
+    wolfSSL_free(ssl);
+    close(sockfd);
+    wolfSSL_CTX_free(ctx);
+    wolfSSL_Cleanup();
+
+    return 0;
+}

dtls/client-dtls13-cid.c

@@ -0,0 +1,168 @@
+/*
+ * client-dtls.c
+ *
+ * Copyright (C) 2006-2020 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
+ *
+ *=============================================================================
+ *
+ * Example of DTLS client sending data from a changing socket using
+ * Connection ID. The client's socket is reset after every message sent so each
+ * new datagram is sent from a different port.
+ */
+
+#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
+
+
+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];
+
+    /* Program argument checking */
+    if (argc != 2) {
+        printf("usage: %s <IP address>\n", argv[0]);
+        return 1;
+    }
+
+    /* Initialize wolfSSL before assigning ctx */
+    wolfSSL_Init();
+
+    /* wolfSSL_Debugging_ON(); */
+
+    if ( (ctx = wolfSSL_CTX_new(wolfDTLSv1_3_client_method())) == NULL) {
+        fprintf(stderr, "wolfSSL_CTX_new error.\n");
+        return 1;
+    }
+
+    /* 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(&servAddr, 0, sizeof(servAddr));
+    servAddr.sin_family = AF_INET;
+    servAddr.sin_port = htons(SERV_PORT);
+    if (inet_pton(AF_INET, argv[1], &servAddr.sin_addr) < 1) {
+        printf("Error and/or invalid IP address");
+        return 1;
+    }
+
+    if (wolfSSL_dtls_cid_use(ssl) != SSL_SUCCESS) {
+        fprintf(stderr, "wolfSSL_dtls_cid_use error.\n");
+        return 1;
+    }
+    if (wolfSSL_dtls_set_peer(ssl, &servAddr, sizeof(servAddr)) != SSL_SUCCESS) {
+        fprintf(stderr, "wolfSSL_dtls_set_peer error.\n");
+        return 1;
+    }
+
+    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+       printf("cannot create a socket.");
+       return 1;
+    }
+
+    /* 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) {
+        if (strncmp(sendLine, "exit", strlen("exit")) == 0)
+            break;
+
+        /* 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);
+
+        close(sockfd);
+        if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+           printf("cannot create a socket.");
+           return 1;
+        }
+        /* Set the file descriptor for ssl and connect with ssl variable */
+        wolfSSL_set_fd(ssl, sockfd);
+    }
+/*                End code for sending datagram to server                    */
+/*****************************************************************************/
+
+    /* Housekeeping */
+    wolfSSL_shutdown(ssl);
+    wolfSSL_free(ssl);
+    close(sockfd);
+    wolfSSL_CTX_free(ctx);
+    wolfSSL_Cleanup();
+
+    return 0;
+}