475 lines
15 KiB
C
475 lines
15 KiB
C
/* test/heartbeat_test.c */
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/*-
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* Unit test for TLS heartbeats.
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*
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* Acts as a regression test against the Heartbleed bug (CVE-2014-0160).
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*
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* Author: Mike Bland (mbland@acm.org, http://mike-bland.com/)
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* Date: 2014-04-12
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* License: Creative Commons Attribution 4.0 International (CC By 4.0)
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* http://creativecommons.org/licenses/by/4.0/deed.en_US
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*
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* OUTPUT
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* ------
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* The program returns zero on success. It will print a message with a count
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* of the number of failed tests and return nonzero if any tests fail.
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*
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* It will print the contents of the request and response buffers for each
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* failing test. In a "fixed" version, all the tests should pass and there
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* should be no output.
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*
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* In a "bleeding" version, you'll see:
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*
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* test_dtls1_heartbleed failed:
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* expected payload len: 0
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* received: 1024
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* sent 26 characters
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* "HEARTBLEED "
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* received 1024 characters
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* "HEARTBLEED \xde\xad\xbe\xef..."
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* ** test_dtls1_heartbleed failed **
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*
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* The contents of the returned buffer in the failing test will depend on the
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* contents of memory on your machine.
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*
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* MORE INFORMATION
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* ----------------
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* http://mike-bland.com/2014/04/12/heartbleed.html
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* http://mike-bland.com/tags/heartbleed.html
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*/
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#define OPENSSL_UNIT_TEST
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#include "../test/testutil.h"
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#include "../ssl/ssl_locl.h"
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !defined(OPENSSL_NO_HEARTBEATS) && !defined(OPENSSL_NO_UNIT_TEST)
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/* As per https://tools.ietf.org/html/rfc6520#section-4 */
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# define MIN_PADDING_SIZE 16
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/* Maximum number of payload characters to print as test output */
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# define MAX_PRINTABLE_CHARACTERS 1024
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typedef struct heartbeat_test_fixture {
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SSL_CTX *ctx;
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SSL *s;
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const char *test_case_name;
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int (*process_heartbeat) (SSL *s);
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unsigned char *payload;
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int sent_payload_len;
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int expected_return_value;
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int return_payload_offset;
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int expected_payload_len;
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const char *expected_return_payload;
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} HEARTBEAT_TEST_FIXTURE;
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static HEARTBEAT_TEST_FIXTURE set_up(const char *const test_case_name,
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const SSL_METHOD *meth)
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{
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HEARTBEAT_TEST_FIXTURE fixture;
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int setup_ok = 1;
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memset(&fixture, 0, sizeof(fixture));
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fixture.test_case_name = test_case_name;
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fixture.ctx = SSL_CTX_new(meth);
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if (!fixture.ctx) {
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fprintf(stderr, "Failed to allocate SSL_CTX for test: %s\n",
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test_case_name);
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setup_ok = 0;
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goto fail;
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}
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fixture.s = SSL_new(fixture.ctx);
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if (!fixture.s) {
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fprintf(stderr, "Failed to allocate SSL for test: %s\n",
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test_case_name);
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setup_ok = 0;
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goto fail;
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}
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if (!ssl_init_wbio_buffer(fixture.s, 1)) {
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fprintf(stderr, "Failed to set up wbio buffer for test: %s\n",
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test_case_name);
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setup_ok = 0;
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goto fail;
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}
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if (!ssl3_setup_buffers(fixture.s)) {
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fprintf(stderr, "Failed to setup buffers for test: %s\n",
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test_case_name);
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setup_ok = 0;
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goto fail;
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}
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/*
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* Clear the memory for the return buffer, since this isn't automatically
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* zeroed in opt mode and will cause spurious test failures that will
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* change with each execution.
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*/
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memset(fixture.s->s3->wbuf.buf, 0, fixture.s->s3->wbuf.len);
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fail:
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if (!setup_ok) {
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ERR_print_errors_fp(stderr);
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exit(EXIT_FAILURE);
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}
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return fixture;
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}
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static HEARTBEAT_TEST_FIXTURE set_up_dtls(const char *const test_case_name)
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{
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HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
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DTLSv1_server_method());
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fixture.process_heartbeat = dtls1_process_heartbeat;
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/*
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* As per dtls1_get_record(), skipping the following from the beginning
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* of the returned heartbeat message: type-1 byte; version-2 bytes;
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* sequence number-8 bytes; length-2 bytes And then skipping the 1-byte
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* type encoded by process_heartbeat for a total of 14 bytes, at which
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* point we can grab the length and the payload we seek.
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*/
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fixture.return_payload_offset = 14;
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return fixture;
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}
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/* Needed by ssl3_write_bytes() */
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static int dummy_handshake(SSL *s)
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{
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return 1;
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}
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static HEARTBEAT_TEST_FIXTURE set_up_tls(const char *const test_case_name)
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{
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HEARTBEAT_TEST_FIXTURE fixture = set_up(test_case_name,
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TLSv1_server_method());
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fixture.process_heartbeat = tls1_process_heartbeat;
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fixture.s->handshake_func = dummy_handshake;
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/*
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* As per do_ssl3_write(), skipping the following from the beginning of
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* the returned heartbeat message: type-1 byte; version-2 bytes; length-2
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* bytes And then skipping the 1-byte type encoded by process_heartbeat
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* for a total of 6 bytes, at which point we can grab the length and the
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* payload we seek.
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*/
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fixture.return_payload_offset = 6;
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return fixture;
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}
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static void tear_down(HEARTBEAT_TEST_FIXTURE fixture)
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{
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ERR_print_errors_fp(stderr);
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SSL_free(fixture.s);
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SSL_CTX_free(fixture.ctx);
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}
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static void print_payload(const char *const prefix,
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const unsigned char *payload, const int n)
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{
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const int end = n < MAX_PRINTABLE_CHARACTERS ? n
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: MAX_PRINTABLE_CHARACTERS;
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int i = 0;
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printf("%s %d character%s", prefix, n, n == 1 ? "" : "s");
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if (end != n)
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printf(" (first %d shown)", end);
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printf("\n \"");
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for (; i != end; ++i) {
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const unsigned char c = payload[i];
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if (isprint(c))
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fputc(c, stdout);
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else
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printf("\\x%02x", c);
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}
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printf("\"\n");
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}
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static int execute_heartbeat(HEARTBEAT_TEST_FIXTURE fixture)
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{
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int result = 0;
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SSL *s = fixture.s;
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unsigned char *payload = fixture.payload;
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unsigned char sent_buf[MAX_PRINTABLE_CHARACTERS + 1];
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int return_value;
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unsigned const char *p;
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int actual_payload_len;
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s->s3->rrec.data = payload;
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s->s3->rrec.length = strlen((const char *)payload);
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*payload++ = TLS1_HB_REQUEST;
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s2n(fixture.sent_payload_len, payload);
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/*
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* Make a local copy of the request, since it gets overwritten at some
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* point
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*/
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memcpy((char *)sent_buf, (const char *)payload, sizeof(sent_buf));
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return_value = fixture.process_heartbeat(s);
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if (return_value != fixture.expected_return_value) {
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printf("%s failed: expected return value %d, received %d\n",
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fixture.test_case_name, fixture.expected_return_value,
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return_value);
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result = 1;
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}
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/*
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* If there is any byte alignment, it will be stored in wbuf.offset.
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*/
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p = &(s->s3->
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wbuf.buf[fixture.return_payload_offset + s->s3->wbuf.offset]);
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actual_payload_len = 0;
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n2s(p, actual_payload_len);
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if (actual_payload_len != fixture.expected_payload_len) {
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printf("%s failed:\n expected payload len: %d\n received: %d\n",
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fixture.test_case_name, fixture.expected_payload_len,
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actual_payload_len);
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print_payload("sent", sent_buf, strlen((const char *)sent_buf));
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print_payload("received", p, actual_payload_len);
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result = 1;
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} else {
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char *actual_payload =
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BUF_strndup((const char *)p, actual_payload_len);
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if (strcmp(actual_payload, fixture.expected_return_payload) != 0) {
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printf
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("%s failed:\n expected payload: \"%s\"\n received: \"%s\"\n",
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fixture.test_case_name, fixture.expected_return_payload,
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actual_payload);
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result = 1;
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}
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OPENSSL_free(actual_payload);
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}
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if (result != 0) {
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printf("** %s failed **\n--------\n", fixture.test_case_name);
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}
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return result;
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}
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static int honest_payload_size(unsigned char payload_buf[])
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{
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/* Omit three-byte pad at the beginning for type and payload length */
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return strlen((const char *)&payload_buf[3]) - MIN_PADDING_SIZE;
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}
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# define SETUP_HEARTBEAT_TEST_FIXTURE(type)\
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SETUP_TEST_FIXTURE(HEARTBEAT_TEST_FIXTURE, set_up_##type)
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# define EXECUTE_HEARTBEAT_TEST()\
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EXECUTE_TEST(execute_heartbeat, tear_down)
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static int test_dtls1_not_bleeding()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
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/* Three-byte pad at the beginning for type and payload length */
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unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4] =
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" Not bleeding, sixteen spaces of padding" " ";
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const int payload_buf_len = honest_payload_size(payload_buf);
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = payload_buf_len;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = payload_buf_len;
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fixture.expected_return_payload =
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"Not bleeding, sixteen spaces of padding";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_dtls1_not_bleeding_empty_payload()
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{
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int payload_buf_len;
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SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
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/*
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* Three-byte pad at the beginning for type and payload length, plus a
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* NUL at the end
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*/
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unsigned char payload_buf[4 + MAX_PRINTABLE_CHARACTERS];
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memset(payload_buf, ' ', MIN_PADDING_SIZE + 3);
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payload_buf[MIN_PADDING_SIZE + 3] = '\0';
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payload_buf_len = honest_payload_size(payload_buf);
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = payload_buf_len;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = payload_buf_len;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_dtls1_heartbleed()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
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/* Three-byte pad at the beginning for type and payload length */
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unsigned char payload_buf[4 + MAX_PRINTABLE_CHARACTERS] =
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" HEARTBLEED ";
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = 0;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_dtls1_heartbleed_empty_payload()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
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/*
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* Excluding the NUL at the end, one byte short of type + payload length
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* + minimum padding
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*/
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unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4];
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memset(payload_buf, ' ', MIN_PADDING_SIZE + 2);
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payload_buf[MIN_PADDING_SIZE + 2] = '\0';
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = 0;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_dtls1_heartbleed_excessive_plaintext_length()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(dtls);
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/*
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* Excluding the NUL at the end, one byte in excess of maximum allowed
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* heartbeat message length
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*/
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unsigned char payload_buf[SSL3_RT_MAX_PLAIN_LENGTH + 2];
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memset(payload_buf, ' ', sizeof(payload_buf));
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payload_buf[sizeof(payload_buf) - 1] = '\0';
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = honest_payload_size(payload_buf);
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = 0;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_tls1_not_bleeding()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(tls);
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/* Three-byte pad at the beginning for type and payload length */
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unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4] =
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" Not bleeding, sixteen spaces of padding" " ";
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const int payload_buf_len = honest_payload_size(payload_buf);
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = payload_buf_len;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = payload_buf_len;
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fixture.expected_return_payload =
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"Not bleeding, sixteen spaces of padding";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_tls1_not_bleeding_empty_payload()
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{
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int payload_buf_len;
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SETUP_HEARTBEAT_TEST_FIXTURE(tls);
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/*
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* Three-byte pad at the beginning for type and payload length, plus a
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* NUL at the end
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*/
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unsigned char payload_buf[4 + MAX_PRINTABLE_CHARACTERS];
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memset(payload_buf, ' ', MIN_PADDING_SIZE + 3);
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payload_buf[MIN_PADDING_SIZE + 3] = '\0';
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payload_buf_len = honest_payload_size(payload_buf);
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = payload_buf_len;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = payload_buf_len;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_tls1_heartbleed()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(tls);
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/* Three-byte pad at the beginning for type and payload length */
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unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4] =
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" HEARTBLEED ";
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = 0;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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static int test_tls1_heartbleed_empty_payload()
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{
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SETUP_HEARTBEAT_TEST_FIXTURE(tls);
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/*
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* Excluding the NUL at the end, one byte short of type + payload length
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* + minimum padding
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*/
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unsigned char payload_buf[MAX_PRINTABLE_CHARACTERS + 4];
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memset(payload_buf, ' ', MIN_PADDING_SIZE + 2);
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payload_buf[MIN_PADDING_SIZE + 2] = '\0';
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fixture.payload = &payload_buf[0];
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fixture.sent_payload_len = MAX_PRINTABLE_CHARACTERS;
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fixture.expected_return_value = 0;
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fixture.expected_payload_len = 0;
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fixture.expected_return_payload = "";
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EXECUTE_HEARTBEAT_TEST();
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}
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# undef EXECUTE_HEARTBEAT_TEST
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# undef SETUP_HEARTBEAT_TEST_FIXTURE
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int main(int argc, char *argv[])
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{
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int num_failed;
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SSL_library_init();
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SSL_load_error_strings();
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num_failed = test_dtls1_not_bleeding() +
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test_dtls1_not_bleeding_empty_payload() +
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test_dtls1_heartbleed() + test_dtls1_heartbleed_empty_payload() +
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/*
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* The following test causes an assertion failure at
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* ssl/d1_pkt.c:dtls1_write_bytes() in versions prior to 1.0.1g:
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*/
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(OPENSSL_VERSION_NUMBER >= 0x1000107fL ?
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test_dtls1_heartbleed_excessive_plaintext_length() : 0) +
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test_tls1_not_bleeding() +
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test_tls1_not_bleeding_empty_payload() +
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test_tls1_heartbleed() + test_tls1_heartbleed_empty_payload() + 0;
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ERR_print_errors_fp(stderr);
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if (num_failed != 0) {
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printf("%d test%s failed\n", num_failed, num_failed != 1 ? "s" : "");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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#else /* OPENSSL_NO_HEARTBEATS */
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int main(int argc, char *argv[])
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{
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return EXIT_SUCCESS;
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}
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#endif /* OPENSSL_NO_HEARTBEATS */
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