tomato-testing/toxcore/ping_array.c
Green Sky 8eb4892b49 Squashed 'external/toxcore/c-toxcore/' changes from 8f0d505f9a..6d634674a9
6d634674a9 cleanup: Remove old type-ordered event getters.
d1d48d1dfc feat: add ngc events
994ffecc6b refactor: Make event dispatch ordered by receive time.
812f931d5f fix: Make sure there's enough space for CONSUME1 in fuzzers.
50f1b30fa9 test: Add fuzz tests to the coverage run.
df76f5cf47 chore: Move from gcov to llvm source-based coverage.
072e3beb3f fix: issues with packet broadcast error reporting
6b6718e4d2 cleanup: Make group packet entry creation less error-prone
5b9c420ce1 refactor: packet broadcast functions now return errors
af4cb31028 refactor: Use `operator==` for equality tests of `Node_format`.
9592d590cf refactor(test): Slightly nicer C++ interface to tox Random.
c66e10fb7a refactor: Minor refactoring of get_close_nodes functions.
ebc9643862 fix: don't pass garbage data buffer to packet send functions
32b68cffca cleanup: Some more test cleanups, removing overly smart code.
0426624dcb refactor: Assign malloc return to a local variable first.
afc38f2458 test: Add more unit tests for `add_to_list`.
05ce5c1ab9 test: Add "infer" CI check to github, remove from circle.
REVERT: 8f0d505f9a feat: add ngc events
REVERT: 9b8216e70c refactor: Make event dispatch ordered by receive time.

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 6d634674a929edb0ab70689dcbcb195b3547be13
2024-01-12 21:30:48 +01:00

176 lines
4.6 KiB
C

/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2014 Tox project.
*/
/**
* Implementation of an efficient array to store that we pinged something.
*/
#include "ping_array.h"
#include <string.h>
#include "ccompat.h"
#include "crypto_core.h"
#include "mem.h"
#include "mono_time.h"
typedef struct Ping_Array_Entry {
uint8_t *data;
uint32_t length;
uint64_t ping_time;
uint64_t ping_id;
} Ping_Array_Entry;
struct Ping_Array {
const Memory *mem;
Ping_Array_Entry *entries;
uint32_t last_deleted; /* number representing the next entry to be deleted. */
uint32_t last_added; /* number representing the last entry to be added. */
uint32_t total_size; /* The length of entries */
uint32_t timeout; /* The timeout after which entries are cleared. */
};
Ping_Array *ping_array_new(const Memory *mem, uint32_t size, uint32_t timeout)
{
if (size == 0 || timeout == 0) {
return nullptr;
}
if ((size & (size - 1)) != 0) {
// Not a power of 2.
return nullptr;
}
Ping_Array *const empty_array = (Ping_Array *)mem_alloc(mem, sizeof(Ping_Array));
if (empty_array == nullptr) {
return nullptr;
}
Ping_Array_Entry *entries = (Ping_Array_Entry *)mem_valloc(mem, size, sizeof(Ping_Array_Entry));
if (entries == nullptr) {
mem_delete(mem, empty_array);
return nullptr;
}
empty_array->mem = mem;
empty_array->entries = entries;
empty_array->last_deleted = 0;
empty_array->last_added = 0;
empty_array->total_size = size;
empty_array->timeout = timeout;
return empty_array;
}
non_null()
static void clear_entry(Ping_Array *array, uint32_t index)
{
const Ping_Array_Entry empty = {nullptr};
mem_delete(array->mem, array->entries[index].data);
array->entries[index] = empty;
}
void ping_array_kill(Ping_Array *array)
{
if (array == nullptr) {
return;
}
while (array->last_deleted != array->last_added) {
const uint32_t index = array->last_deleted % array->total_size;
clear_entry(array, index);
++array->last_deleted;
}
mem_delete(array->mem, array->entries);
mem_delete(array->mem, array);
}
/** Clear timed out entries. */
non_null()
static void ping_array_clear_timedout(Ping_Array *array, const Mono_Time *mono_time)
{
while (array->last_deleted != array->last_added) {
const uint32_t index = array->last_deleted % array->total_size;
if (!mono_time_is_timeout(mono_time, array->entries[index].ping_time, array->timeout)) {
break;
}
clear_entry(array, index);
++array->last_deleted;
}
}
uint64_t ping_array_add(Ping_Array *array, const Mono_Time *mono_time, const Random *rng,
const uint8_t *data, uint32_t length)
{
ping_array_clear_timedout(array, mono_time);
const uint32_t index = array->last_added % array->total_size;
if (array->entries[index].data != nullptr) {
array->last_deleted = array->last_added - array->total_size;
clear_entry(array, index);
}
uint8_t *entry_data = (uint8_t *)mem_balloc(array->mem, length);
if (entry_data == nullptr) {
array->entries[index].data = nullptr;
return 0;
}
memcpy(entry_data, data, length);
array->entries[index].data = entry_data;
array->entries[index].length = length;
array->entries[index].ping_time = mono_time_get(mono_time);
++array->last_added;
uint64_t ping_id = random_u64(rng);
ping_id /= array->total_size;
ping_id *= array->total_size;
ping_id += index;
if (ping_id == 0) {
ping_id += array->total_size;
}
array->entries[index].ping_id = ping_id;
return ping_id;
}
int32_t ping_array_check(Ping_Array *array, const Mono_Time *mono_time, uint8_t *data,
size_t length, uint64_t ping_id)
{
if (ping_id == 0) {
return -1;
}
const uint32_t index = ping_id % array->total_size;
if (array->entries[index].ping_id != ping_id) {
return -1;
}
if (mono_time_is_timeout(mono_time, array->entries[index].ping_time, array->timeout)) {
return -1;
}
if (array->entries[index].length > length) {
return -1;
}
// TODO(iphydf): This can't happen? If it indeed can't, turn it into an assert.
if (array->entries[index].data == nullptr) {
return -1;
}
memcpy(data, array->entries[index].data, array->entries[index].length);
const uint32_t len = array->entries[index].length;
clear_entry(array, index);
return len;
}