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165 lines (142 loc) · 7.25 KB
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Copy pathmasking.c
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165 lines (142 loc) · 7.25 KB
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#include <stdint.h>
#include <stdio.h>
#include <ctype.h>
#include "wg-obfuscator.h"
#include "masking.h"
#include "masking_handlers.h"
static _Thread_local struct {
int listen_sock;
struct sockaddr_in *sender_addr;
int server_sock;
} g_send_ctx;
static ssize_t send_to_client_cb(uint8_t *buffer, int length) {
return sendto(g_send_ctx.listen_sock, buffer, length, 0, (struct sockaddr *)g_send_ctx.sender_addr, sizeof(*g_send_ctx.sender_addr));
}
static ssize_t send_to_server_cb(uint8_t *buffer, int length) {
return send(g_send_ctx.server_sock, buffer, length, 0);
}
masking_handler_t * get_masking_handler_by_name(const char *name) {
if (!name) return NULL;
for (int i = 0; masking_handlers[i]; ++i) {
char handler_name_lower[sizeof(masking_handlers[i]->name)];
snprintf(handler_name_lower, sizeof(handler_name_lower), "%s", masking_handlers[i]->name);
handler_name_lower[sizeof(handler_name_lower) - 1] = 0;
for (char *p = handler_name_lower; *p; ++p) *p = tolower((unsigned char)*p);
if (strcmp(name, handler_name_lower) == 0) {
return masking_handlers[i];
}
}
return NULL;
}
void masking_on_handshake_req_from_client(obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *client_addr,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_handshake_req) {
return;
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
client->masking_handler->on_handshake_req(config, client, DIR_CLIENT_TO_SERVER, client_addr, server_addr, send_to_client_cb, send_to_server_cb);
}
void masking_on_handshake_req_from_server(obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *client_addr,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_handshake_req) {
return;
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
client->masking_handler->on_handshake_req(config, client, DIR_SERVER_TO_CLIENT, server_addr, client_addr, send_to_server_cb, send_to_client_cb);
}
int masking_unwrap_from_client(uint8_t *buffer, int length,
obfuscator_config_t *config,
client_entry_t *client, // can be NULL!
int listen_sock,
struct sockaddr_in *client_addr,
struct sockaddr_in *server_addr,
masking_handler_t **masking_handler_out) {
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = client_addr;
g_send_ctx.server_sock = client ? client->server_sock : 0;
if (!client && !config->masking_handler_set) {
// Brueteforce detection of masking type if no client entry and no default masking handler
for (int i = 0; masking_handlers[i]; ++i) {
int r = masking_handlers[i]->on_data_unwrap(buffer, length, config, NULL, DIR_CLIENT_TO_SERVER, client_addr, server_addr, send_to_client_cb, send_to_server_cb);
if (r >= 0) {
// Found a matching masking handler
log(LL_TRACE, "Autodetected masking handler for packet from %s:%d: %s", inet_ntoa(client_addr->sin_addr), ntohs(client_addr->sin_port), masking_handlers[i]->name);
if (masking_handler_out) {
*masking_handler_out = masking_handlers[i];
}
return r;
}
}
// No matching masking handler found
if (masking_handler_out) {
*masking_handler_out = NULL;
}
return length;
}
masking_handler_t *handler = client ? client->masking_handler : config->masking_handler;
if (!handler || !handler->on_data_unwrap) {
return length; // no masking handler, nothing to do
}
return handler->on_data_unwrap(buffer, length, config, client, DIR_CLIENT_TO_SERVER, client_addr, server_addr, send_to_client_cb, client ? send_to_server_cb : NULL);
}
int masking_unwrap_from_server(uint8_t *buffer, int length,
obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_data_unwrap) {
return length; // no masking handler, nothing to do
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
return client->masking_handler->on_data_unwrap(buffer, length, config, client, DIR_SERVER_TO_CLIENT, server_addr, &client->client_addr, send_to_server_cb, send_to_client_cb);
}
int masking_data_wrap_to_client(uint8_t *buffer, int length,
obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_data_wrap) {
return length; // no masking handler, nothing to do
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
return client->masking_handler->on_data_wrap(buffer, length, config, client, DIR_SERVER_TO_CLIENT, server_addr, &client->client_addr, send_to_server_cb, send_to_client_cb);
}
int masking_data_wrap_to_server(uint8_t *buffer, int length,
obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_data_wrap) {
return length; // no masking handler, nothing to do
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
return client->masking_handler->on_data_wrap(buffer, length, config, client, DIR_CLIENT_TO_SERVER, &client->client_addr, server_addr, send_to_client_cb, send_to_server_cb);
}
void masking_on_timer(obfuscator_config_t *config,
client_entry_t *client,
int listen_sock,
struct sockaddr_in *server_addr) {
if (!client->masking_handler || !client->masking_handler->on_timer) {
return;
}
g_send_ctx.listen_sock = listen_sock;
g_send_ctx.sender_addr = &client->client_addr;
g_send_ctx.server_sock = client->server_sock;
client->masking_handler->on_timer(config, client, &client->client_addr, server_addr, send_to_client_cb, send_to_server_cb);
}