Added submodule contents into tree

externals/mbedtls/programs/fuzz/fuzz_dtlsclient.c

@@ -0,0 +1,136 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "common.h"
+#include "mbedtls/ssl.h"
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/timing.h"
+#include "test/certs.h"
+
+#if defined(MBEDTLS_SSL_CLI_C) && \
+    defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C) && \
+    defined(MBEDTLS_TIMING_C)
+static int initialized = 0;
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
+static mbedtls_x509_crt cacert;
+#endif
+
+const char *pers = "fuzz_dtlsclient";
+#endif
+#endif // MBEDTLS_SSL_PROTO_DTLS
+
+
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS) && \
+    defined(MBEDTLS_SSL_CLI_C) && \
+    defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C) && \
+    defined(MBEDTLS_TIMING_C)
+    int ret;
+    size_t len;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_entropy_context entropy;
+    mbedtls_timing_delay_context timer;
+    unsigned char buf[4096];
+    fuzzBufferOffset_t biomemfuzz;
+
+    if (initialized == 0) {
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
+        mbedtls_x509_crt_init(&cacert);
+        if (mbedtls_x509_crt_parse(&cacert, (const unsigned char *) mbedtls_test_cas_pem,
+                                   mbedtls_test_cas_pem_len) != 0) {
+            return 1;
+        }
+#endif
+        dummy_init();
+
+        initialized = 1;
+    }
+
+    mbedtls_ssl_init(&ssl);
+    mbedtls_ssl_config_init(&conf);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+    mbedtls_entropy_init(&entropy);
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_status_t status = psa_crypto_init();
+    if (status != PSA_SUCCESS) {
+        goto exit;
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    srand(1);
+    if (mbedtls_ctr_drbg_seed(&ctr_drbg, dummy_entropy, &entropy,
+                              (const unsigned char *) pers, strlen(pers)) != 0) {
+        goto exit;
+    }
+
+    if (mbedtls_ssl_config_defaults(&conf,
+                                    MBEDTLS_SSL_IS_CLIENT,
+                                    MBEDTLS_SSL_TRANSPORT_DATAGRAM,
+                                    MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
+        goto exit;
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
+    mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
+#endif
+    mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_NONE);
+    mbedtls_ssl_conf_rng(&conf, dummy_random, &ctr_drbg);
+
+    if (mbedtls_ssl_setup(&ssl, &conf) != 0) {
+        goto exit;
+    }
+
+    mbedtls_ssl_set_timer_cb(&ssl, &timer, mbedtls_timing_set_delay,
+                             mbedtls_timing_get_delay);
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
+    if (mbedtls_ssl_set_hostname(&ssl, "localhost") != 0) {
+        goto exit;
+    }
+#endif
+
+    biomemfuzz.Data = Data;
+    biomemfuzz.Size = Size;
+    biomemfuzz.Offset = 0;
+    mbedtls_ssl_set_bio(&ssl, &biomemfuzz, dummy_send, fuzz_recv, fuzz_recv_timeout);
+
+    ret = mbedtls_ssl_handshake(&ssl);
+    if (ret == 0) {
+        //keep reading data from server until the end
+        do {
+            len = sizeof(buf) - 1;
+            ret = mbedtls_ssl_read(&ssl, buf, len);
+
+            if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
+                continue;
+            } else if (ret <= 0) {
+                //EOF or error
+                break;
+            }
+        } while (1);
+    }
+
+exit:
+    mbedtls_entropy_free(&entropy);
+    mbedtls_ctr_drbg_free(&ctr_drbg);
+    mbedtls_ssl_config_free(&conf);
+    mbedtls_ssl_free(&ssl);
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    mbedtls_psa_crypto_free();
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#else
+    (void) Data;
+    (void) Size;
+#endif
+    return 0;
+}