toxcore/testing/tox_shell.c
iphydf dd8a568141
Make self_connection_status callback stateless.
**What are we doing?**

We are moving towards stateless callbacks. This means that when registering a
callback, you no longer pass a user data pointer. Instead, you pass a user data
pointer to tox_iterate. This pointer is threaded through the code, passed to
each callback. The callback can modify the data pointed at. An extra indirection
will be needed if the pointer itself can change.

**Why?**

Currently, callbacks are registered with a user data pointer. This means the
library has N pointers for N different callbacks. These pointers need to be
managed by the client code. Managing the lifetime of the pointee can be
difficult. In C++, it takes special effort to ensure that the lifetime of user
data extends at least beyond the lifetime of the Tox instance. For other
languages, the situation is much worse. Java and other garbage collected
languages may move objects in memory, so the pointers are not stable. Tox4j goes
through a lot of effort to make the Java/Scala user experience a pleasant one by
keeping a global array of Tox+userdata on the C++ side, and communicating via
protobufs. A Haskell FFI would have to do similarly complex tricks.

Stateless callbacks ensure that a user data pointer only needs to live during a
single function call. This means that the user code (or language runtime) can
move the data around at will, as long as it sets the new location in the
callback.

**How?**

We are doing this change one callback at a time. After each callback, we ensure
that everything still works as expected. This means the toxcore change will
require 15 Pull Requests.
2016-08-17 14:57:20 +01:00

161 lines
4.4 KiB
C

/* Tox Shell
*
* Proof of concept ssh like server software using tox.
*
* Command line arguments are the ip, port and public_key of a node (for bootstrapping).
*
* EX: ./test 127.0.0.1 33445 CDCFD319CE3460824B33BE58FD86B8941C9585181D8FBD7C79C5721D7C2E9F7C
*
*
* Copyright (C) 2014 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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 3 of the License, or
* (at your option) any later version.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "../toxcore/tox.h"
#include "misc_tools.c"
#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
#include <util.h>
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <libutil.h>
#else
#include <pty.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#define c_sleep(x) usleep(1000*x)
void print_online(Tox *tox, uint32_t friendnumber, TOX_CONNECTION status, void *userdata)
{
if (status)
printf("\nOther went online.\n");
else
printf("\nOther went offline.\n");
}
void print_message(Tox *tox, uint32_t friendnumber, TOX_MESSAGE_TYPE type, const uint8_t *string, size_t length,
void *userdata)
{
int master = *((int *)userdata);
write(master, string, length);
write(master, "\n", 1);
}
int main(int argc, char *argv[])
{
uint8_t ipv6enabled = 1; /* x */
int argvoffset = cmdline_parsefor_ipv46(argc, argv, &ipv6enabled);
if (argvoffset < 0)
exit(1);
/* with optional --ipvx, now it can be 1-4 arguments... */
if ((argc != argvoffset + 2) && (argc != argvoffset + 4)) {
printf("Usage: %s [--ipv4|--ipv6] ip port public_key (of the DHT bootstrap node)\n", argv[0]);
exit(0);
}
int *master = malloc(sizeof(int));
int ret = forkpty(master, NULL, NULL, NULL);
if (ret == -1) {
printf("fork failed\n");
return 1;
}
if (ret == 0) {
execl("/bin/sh", "sh", NULL);
return 0;
}
int flags = fcntl(*master, F_GETFL, 0);
int r = fcntl(*master, F_SETFL, flags | O_NONBLOCK);
if (r < 0) {
printf("error setting flags\n");
}
Tox *tox = tox_new(0, 0);
tox_callback_friend_connection_status(tox, print_online, NULL);
tox_callback_friend_message(tox, print_message, master);
uint16_t port = atoi(argv[argvoffset + 2]);
unsigned char *binary_string = hex_string_to_bin(argv[argvoffset + 3]);
int res = tox_bootstrap(tox, argv[argvoffset + 1], port, binary_string, 0);
free(binary_string);
if (!res) {
printf("Failed to convert \"%s\" into an IP address. Exiting...\n", argv[argvoffset + 1]);
exit(1);
}
uint8_t address[TOX_ADDRESS_SIZE];
tox_self_get_address(tox, address);
uint32_t i;
for (i = 0; i < TOX_ADDRESS_SIZE; i++) {
printf("%02X", address[i]);
}
char temp_id[128];
printf("\nEnter the address of the other id you want to sync with (38 bytes HEX format):\n");
if (scanf("%s", temp_id) != 1) {
return 1;
}
uint8_t *bin_id = hex_string_to_bin(temp_id);
uint32_t num = tox_friend_add(tox, bin_id, (uint8_t *)"Install Gentoo", sizeof("Install Gentoo"), 0);
free(bin_id);
if (num == UINT32_MAX) {
printf("\nSomething went wrong when adding friend.\n");
return 1;
}
uint8_t notconnected = 1;
while (1) {
if (tox_self_get_connection_status(tox) && notconnected) {
printf("\nDHT connected.\n");
notconnected = 0;
}
while (tox_friend_get_connection_status(tox, num, 0)) {
uint8_t buf[TOX_MAX_MESSAGE_LENGTH];
ret = read(*master, buf, sizeof(buf));
if (ret <= 0)
break;
tox_friend_send_message(tox, num, TOX_MESSAGE_TYPE_NORMAL, buf, ret, 0);
}
tox_iterate(tox, NULL);
c_sleep(1);
}
return 0;
}