Add support for building fuzzers using american fuzzy lop

Builds fuzzers using http://lcamtuf.coredump.cx/afl/

1 files changed, 72 insertions, 0 deletions

diff --git a/fuzzers/include/fuzzing.hh b/fuzzers/include/fuzzing.hh
new file mode 100644
index 0000000..e4f5eb9
--- /dev/null
+++ b/fuzzers/include/fuzzing.hh
@@ -0,0 +1,72 @@
+#include "olm/olm.hh"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+
+ssize_t read_file(
+    int fd,
+    uint8_t **buffer
+) {
+    size_t buffer_size = 4096;
+    uint8_t * current_buffer = (uint8_t *) malloc(buffer_size);
+    if (current_buffer == NULL) return -1;
+    size_t buffer_pos = 0;
+    while (1) {
+        ssize_t count = read(
+            fd, current_buffer + buffer_pos, buffer_size - buffer_pos
+        );
+        if (count < 0) break;
+        if (count == 0) {
+            uint8_t * return_buffer = (uint8_t *) realloc(current_buffer, buffer_pos);
+            if (return_buffer == NULL) break;
+            *buffer = return_buffer;
+            return buffer_pos;
+        }
+        buffer_pos += count;
+        if (buffer_pos == buffer_size) {
+            buffer_size *= 2;
+            uint8_t * new_buffer = (uint8_t *) realloc(current_buffer, buffer_size);
+            if (new_buffer == NULL) break;
+            current_buffer = new_buffer;
+        }
+    }
+    free(current_buffer);
+    return -1;
+}
+
+template<typename T>
+T check_errno(
+    const char * message,
+    T value
+) {
+    if (value == T(-1)) {
+        perror(message);
+        exit(1);
+    }
+    return value;
+}
+
+size_t check_session(
+    OlmSession * session,
+    const char * message,
+    size_t value
+) {
+    if (value == olm_error()) {
+        const char * olm_message = olm_session_last_error(session);
+        ssize_t ignored;
+        ignored = write(STDERR_FILENO, message, strlen(message));
+        ignored = write(STDERR_FILENO, ": ", 2);
+        ignored = write(STDERR_FILENO, olm_message, strlen(olm_message));
+        ignored = write(STDERR_FILENO, "\n", 1);
+        exit(2);
+        return ignored;
+    }
+    return value;
+}