/*
* Copyright (c) 2020 Sergey Nizovtsev <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <stddef.h>
#include <assert.h>
#include <fcntl.h>

#include "tmux.h"

#define FUZZER_MAXLEN 512
#define PANE_WIDTH 80
#define PANE_HEIGHT 25

struct event_base *libevent;

int
LLVMFuzzerTestOneInput(const u_char *data, size_t size)
{
       struct bufferevent      *vpty[2];
       struct window           *w;
       struct window_pane      *wp;
       int                      error;

       /*
        * Since AFL doesn't support -max_len parameter we have to
        * discard long inputs manually.
        */
       if (size > FUZZER_MAXLEN)
               return 0;

       w = window_create(PANE_WIDTH, PANE_HEIGHT, 0, 0);
       wp = window_add_pane(w, NULL, 0, 0);
       bufferevent_pair_new(libevent, BEV_OPT_CLOSE_ON_FREE, vpty);
       wp->ictx = input_init(wp, vpty[0], NULL);
       window_add_ref(w, __func__);

       wp->fd = open("/dev/null", O_WRONLY);
       if (wp->fd == -1)
               errx(1, "open(\"/dev/null\") failed");
       wp->event = bufferevent_new(wp->fd, NULL, NULL, NULL, NULL);

       input_parse_buffer(wp, (u_char *)data, size);
       while (cmdq_next(NULL) != 0)
               ;
       error = event_base_loop(libevent, EVLOOP_NONBLOCK);
       if (error == -1)
               errx(1, "event_base_loop failed");

       assert(w->references == 1);
       window_remove_ref(w, __func__);

       bufferevent_free(vpty[0]);
       bufferevent_free(vpty[1]);

       return 0;
}

int
LLVMFuzzerInitialize(__unused int *argc, __unused char ***argv)
{
       const struct options_table_entry        *oe;

       global_environ = environ_create();
       global_options = options_create(NULL);
       global_s_options = options_create(NULL);
       global_w_options = options_create(NULL);
       for (oe = options_table; oe->name != NULL; oe++) {
               if (oe->scope & OPTIONS_TABLE_SERVER)
                       options_default(global_options, oe);
               if (oe->scope & OPTIONS_TABLE_SESSION)
                       options_default(global_s_options, oe);
               if (oe->scope & OPTIONS_TABLE_WINDOW)
                       options_default(global_w_options, oe);
       }
       libevent = osdep_event_init();

       options_set_number(global_w_options, "monitor-bell", 0);
       options_set_number(global_w_options, "allow-rename", 1);
       options_set_number(global_options, "set-clipboard", 2);
       socket_path = xstrdup("dummy");

       return 0;
}