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idanet.cpp
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idanet.cpp
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/*
Asynchronous IDA communications handler
Copyright (C) 2018 Chris Eagle <cseagle at gmail d0t com>
Copyright (C) 2018 Tim Vidas <tvidas at gmail d0t com>
This program 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 2 of the License, or (at your option)
any later version.
This program 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
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef _WIN32
#ifndef _MSC_VER
#include <windows.h>
#endif
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include <pro.h>
#include <ida.hpp>
#include <idp.hpp>
#include <kernwin.hpp>
#include <loader.hpp>
#include <nalt.hpp>
#include <md5.h>
#include <stdint.h>
#include <json-c/json.h>
#include "collabreate.h"
#include "idanet.h"
//array to track send and receive stats for all of the collabreate commands
extern int stats[2][MSG_IDA_MAX + 1];
#ifndef _WIN32
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <errno.h>
#define closesocket close
#define INVALID_SOCKET ((_SOCKET)-1)
#define SOCKET_ERROR -1
#endif
struct disp_request_t : public exec_request_t {
disp_request_t(Dispatcher disp) : _disp(disp) {mtx = qmutex_create();};
~disp_request_t();
virtual int idaapi execute(void);
//disp_requst_t takes ownership of the buffer
//it will be deleted eventually in execute
void queueObject(json_object *obj);
void flush(void);
qvector<json_object*> objects;
qmutex_t mtx;
Dispatcher _disp;
};
class CollabSocket {
public:
CollabSocket(Dispatcher disp);
bool isConnected();
bool connect(const char *host, short port);
bool close();
void cleanup(bool warn = false);
bool sendAll(const qstring &s);
bool sendMsg(const qstring &s);
int recv(unsigned char *buf, unsigned int len);
private:
#ifdef _WIN32
HANDLE thread;
static DWORD WINAPI recvHandler(void *sock);
#else
pthread_t thread;
static void *recvHandler(void *sock);
#endif
qstring host;
short port;
Dispatcher _disp;
disp_request_t *drt;
_SOCKET conn;
bool connected;
static bool initNetwork();
};
static CollabSocket *comm;
bool init_network() {
static bool isInit = false;
if (!isInit) {
#ifdef _WIN32
//initialize winsock.
WSADATA wsock;
if (WSAStartup(MAKEWORD(2, 2), &wsock) != 0) {
msg(PLUGIN_NAME": initNetwork() failed.\n");
}
//check requested version
else if (LOBYTE(wsock.wVersion) != 2 || HIBYTE(wsock.wVersion) != 2) {
// WSACleanup();
msg(PLUGIN_NAME": Winsock version 2.2 not found.\n");
}
else {
isInit = true;
}
#else
isInit = true;
#endif
}
return isInit;
}
//connect to a remote host as specified by host and port
//host may be either an ip address or a host name
bool connect_to(const char *host, short port, _SOCKET *sock) {
bool result = false;
addrinfo hints;
addrinfo *ai;
sockaddr_in *server;
memset(&hints, 0, sizeof(addrinfo));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(host, NULL, &hints, &ai) == 0) {
server = (sockaddr_in*)ai->ai_addr;
server->sin_port = qhtons(port);
//create a socket.
if ((*sock = (_SOCKET)socket(AF_INET, SOCK_STREAM, 0)) != INVALID_SOCKET) {
if (connect(*sock, ai->ai_addr, (int)ai->ai_addrlen) == SOCKET_ERROR) {
msg(PLUGIN_NAME": Failed to connect to server.\n");
closesocket(*sock);
}
else {
#ifdef _WIN32
DWORD tv = 2000;
#else
timeval tv;
tv.tv_sec = 2;
tv.tv_usec = 0;
#endif
//we force a periodic timeout to force a recv error after
//the socket has been closed. On windows, simply closing
//the socket causes a blocking recv to fail and the recvHandler
//thread to terminate. On Linux, closing the socket was not
//causing the blocking recv to terminate, hence the timeout
//following a timeout, if the socket has been closed, the next
//receive will fail. Not elegant but it works
setsockopt(*sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(tv));
result = true;
}
}
else {
msg(PLUGIN_NAME": Failed to create socket.\n");
}
freeaddrinfo(ai);
}
return result;
}
disp_request_t::~disp_request_t() {
flush();
qmutex_free(mtx);
};
//this is the callback that gets called by execute_sync, in theory new datagrams
//can arrive and be processed during the loop since queue synchronization takes
//place within the StringList
int idaapi disp_request_t::execute(void) {
while (objects.size() > 0) {
qmutex_lock(mtx);
qvector<json_object*>::iterator i = objects.begin();
json_object *obj = *i;
objects.erase(i);
qmutex_unlock(mtx);
bool res = (*_disp)(obj);
if (!res) { //not sure we really care what is returned here
// msg(PLUGIN_NAME": connection to server severed at dispatch.\n");
// comm->cleanup(true); //probably not the right thing to do??
// break;
}
else {
//msg(PLUGIN_NAME": dispatch routine called successfully.\n");
}
}
return 0;
}
//queue up a received datagram for eventual handlng via IDA's execute_sync mechanism
//call no sdk functions other than execute_sync
void disp_request_t::queueObject(json_object *obj) {
bool call_exec = false;
qmutex_lock(mtx);
objects.push_back(obj);
call_exec = objects.size() == 1;
qmutex_unlock(mtx);
if (call_exec) {
//only invoke execute_sync if the buffer just added was at the head of the queue
//in theory this allows multiple datagrams to get queued for handling
//in a single execute_sync callback
execute_sync(*this, MFF_WRITE);
}
}
void disp_request_t::flush() {
qmutex_lock(mtx);
for (qvector<json_object*>::iterator i = objects.begin(); i != objects.end(); i++) {
json_object_put(*i);
}
objects.clear();
qmutex_unlock(mtx);
}
bool connect_to(const char *host, short port, Dispatcher disp) {
comm = new CollabSocket(disp);
if (!comm->connect(host, port)) {
delete comm;
comm = NULL;
}
return comm != NULL;
}
bool is_connected() {
return comm != NULL ? comm->isConnected() : false;
}
bool CollabSocket::isConnected() {
return connected;
}
/////////////////////////////////////////////////////////////////////////////////////////
//cleanup(bool warn)
//
//cancel all notifications, close the socket and destroy the hook notification window.
//
//arguments: warn true displays a warning that cleanup is being called, false no warning
//returns: none.
//
void CollabSocket::cleanup(bool warn) {
//cancel all notifications. if we don't do this ida will crash on exit.
msg(PLUGIN_NAME": cleanup called.\n");
if (connected) {
int res = ::closesocket(conn);
msg("closesocket returned %d\n", res);
connected = false;
conn = (_SOCKET)INVALID_SOCKET;
/*
* TODO: rethink this. Is joining on the comm thread necessary?
* All paths to cleanup SHOULD come via the IDA work thread
* which means this should NOT deadlock, but it seems to
*/
/*
#ifdef _WIN32
if (thread) {
msg("attempting to sync on thread exit\n");
WaitForSingleObject(thread, INFINITE);
thread = NULL;
}
#else
if (thread) {
msg("attempting to sync on thread exit\n");
pthread_join(thread, NULL);
thread = 0;
}
#endif
*/
#ifdef _WIN32
thread = NULL;
#else
thread = 0;
#endif
if (warn) {
warning("Connection to collabREate server has been closed.\n"
"You should reconnect to the server before sending\n"
"additional updates.");
}
}
}
/////////////////////////////////////////////////////////////////////////////////////////
//cleanup(bool warn)
//
//cancel all notifications, close the socket and destroy the hook notification window.
//
//arguments: warn true displays a warning that cleanup is being called, false no warning
//returns: none.
//
void cleanup(bool warn) {
if (comm) {
comm->cleanup(warn);
delete comm;
comm = NULL;
}
}
//connect to a remote host as specified by host and port
//host may be wither an ip address or a host name
bool CollabSocket::connect(const char *host, short port) {
//create a socket.
//remember these values if we need to reconnect
this->host = host;
this->port = port;
if (connect_to(host, port, &conn)) {
//socket is connected create thread to handle receive data
#ifdef _WIN32
if ((thread = CreateThread(NULL, 0, recvHandler, this, 0, NULL)) == NULL) {
#else
if (pthread_create(&thread, NULL, recvHandler, this)) {
#endif
//error failed to create thread
msg(PLUGIN_NAME": Failed to create connection handler.\n");
cleanup();
}
else {
connected = true;
}
}
else {
msg(PLUGIN_NAME": Failed to create socket.\n");
}
return connected;
}
bool CollabSocket::sendAll(const qstring &s) {
qstring buf = s;
while (true) {
// msg("sending new buffer\n");
int len = ::send(conn, buf.c_str(), (int)buf.length(), 0);
if (len == (int)buf.length()) {
break;
}
if (len == SOCKET_ERROR) {
#ifdef _WIN32
int sockerr = WSAGetLastError();
#else
int sockerr = errno;
#endif
cleanup();
msg(PLUGIN_NAME": Failed to send requested data. %d != %d. Error: 0x%x(%d)\n", len, buf.length(), sockerr, sockerr);
return false;
}
else if (len != (int)buf.length()) {
//shift the remainder and try again
buf = buf.c_str() + len;
//msg(PLUGIN_NAME": Short send. %d != %d.", len, out.size());
}
}
return true;
}
CollabSocket::CollabSocket(Dispatcher disp) {
_disp = disp;
thread = 0;
init_network();
conn = (_SOCKET)INVALID_SOCKET;
connected = false;
drt = new disp_request_t(_disp);
}
bool CollabSocket::close() {
cleanup();
return true;
}
int CollabSocket::recv(unsigned char *buf, unsigned int len) {
return ::recv(conn, (char*)buf, len, 0);
}
//We don't call ANY sdk functions from here because this is a separate thread
//and we don't want to do anything other than execute_sync (which happens in
//queueBuffer
#ifdef _WIN32
DWORD WINAPI CollabSocket::recvHandler(void *_sock) {
#else
void *CollabSocket::recvHandler(void *_sock) {
#endif
static qstring b;
unsigned char buf[2048]; //read a large chunk, we'll be notified if there is more
CollabSocket *sock = (CollabSocket*)_sock;
json_tokener *tok = json_tokener_new();
while (sock->isConnected()) {
int len = sock->recv(buf, sizeof(buf) - 1);
if (len == 0) {
//end of file
break;
}
if (len < 0) {
#ifdef _WIN32
//timeouts are okay
if (WSAGetLastError() == WSAETIMEDOUT) {
continue;
}
#else
//timeouts are okay
if (errno == EAGAIN || errno == EWOULDBLOCK) {
continue;
}
#endif
// assumption is that socket is borked and next send will fail also
// maybe should close socket here at a minimum.
// in any case thread is exiting
// reconnecting is a better strategy
break;
}
if (sock->_disp) {
json_object *jobj = NULL;
enum json_tokener_error jerr;
buf[len] = 0;
b.append((char*)buf, len); //append new data into static buffer
while (1) {
jobj = json_tokener_parse_ex(tok, b.c_str(), (int)b.length());
jerr = json_tokener_get_error(tok);
if (jerr == json_tokener_continue) {
//json object is syntactically correct, but incomplete
// msg("json_tokener_continue for %s\n", b.c_str());
break;
}
else if (jerr != json_tokener_success) {
//need to reconnect socket and in the meantime start caching event locally
// msg("jerr != json_tokener_success for %s\n", b.c_str());
//need to break out of both loops
goto end_loop;
}
else if (jobj != NULL) {
//we extracted a json object from the front of the string
//queue it and trim the string
// msg("json_tokener_success for %s\n", b.c_str());
if (tok->char_offset < b.length()) {
//shift any remaining portions of the buffer to the front
b.remove(0, tok->char_offset);
}
else {
b.clear();
}
sock->drt->queueObject(jobj);
}
}
json_tokener_reset(tok);
}
}
end_loop:
json_tokener_free(tok);
sock->cleanup();
return 0;
}
int send_all(const qstring &s) {
if (comm) {
return comm->sendAll(s);
}
return 0;
}
int send_msg(const qstring &s) {
if (comm) {
return comm->sendAll(s);
}
else {
if (changeCache != NULL) {
// msg("writing to change cache\n");
*changeCache += s;
return (int)s.length();
}
}
return 0;
}