--- /dev/null
+/*
+ * 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
+ */
+
+/*
+ * Author : Maxim Mamontov <faust@stargazer.dp.ua>
+ */
+
+#include "conn.h"
+
+#include "stg/admins.h"
+#include "stg/admin.h"
+#include "stg/logger.h"
+#include "stg/blowfish.h"
+#include "stg/bfstream.h"
+#include "stg/common.h"
+
+#include <cassert>
+#include <cstring>
+#include <cerrno>
+
+#include <unistd.h>
+#include <sys/socket.h>
+
+using STG::Conn;
+
+const char Conn::STG_HEADER[] = "SG04";
+const char Conn::OK_HEADER[] = "OKHD";
+const char Conn::ERR_HEADER[] = "ERHD";
+const char Conn::OK_LOGIN[] = "OKLG";
+const char Conn::ERR_LOGIN[] = "ERLG";
+const char Conn::OK_LOGINS[] = "OKLS";
+const char Conn::ERR_LOGINS[] = "ERLS";
+
+Conn::Conn(const BASE_PARSER::REGISTRY & registry,
+ Admins & admins, int sock, const sockaddr_in& addr,
+ PluginLogger & logger)
+ : m_registry(registry),
+ m_admins(admins),
+ m_admin(NULL),
+ m_sock(sock),
+ m_addr(addr),
+ m_keepAlive(false),
+ m_parser(NULL),
+ m_xmlParser(XML_ParserCreate(NULL)),
+ m_state(HEADER),
+ m_buffer(m_header),
+ m_bufferSize(sizeof(m_header)),
+ m_stream(NULL),
+ m_logger(logger),
+#ifdef DUMPCRYPTO
+ m_dataState(false, *this),
+ m_dumper(endpoint())
+#else
+ m_dataState(false, *this)
+#endif
+{
+ if (m_xmlParser == NULL)
+ throw Error("Failed to create XML parser.");
+
+ XML_ParserReset(m_xmlParser, NULL);
+ XML_SetElementHandler(m_xmlParser, ParseXMLStart, ParseXMLEnd);
+ XML_SetUserData(m_xmlParser, this);
+}
+
+Conn::~Conn()
+{
+ shutdown(m_sock, SHUT_RDWR);
+ close(m_sock);
+
+ XML_ParserFree(m_xmlParser);
+
+ delete m_stream;
+ delete m_parser;
+}
+
+bool Conn::Read()
+{
+ ssize_t res = read(m_sock, m_buffer, m_bufferSize);
+ if (res < 0)
+ {
+ m_state = ERROR;
+ Log(__FILE__, "Failed to read data from " + endpoint() + ". Reason: '" + strerror(errno) + "'");
+ return false;
+ }
+ if (res == 0 && m_state != DATA) // EOF is ok for data.
+ {
+ m_state = ERROR;
+ Log(__FILE__, "Failed to read data from " + endpoint() + ". Unexpected EOF.");
+ return false;
+ }
+#ifdef DUMPCRYPTO
+ m_dumper.write(m_buffer, res);
+#endif
+ m_bufferSize -= res;
+ m_buffer = static_cast<char*>(m_buffer) + res;
+ return HandleBuffer(res);
+}
+
+bool Conn::WriteAnswer(const void* buffer, size_t size)
+{
+ ssize_t res = write(m_sock, buffer, size);
+ if (res < 0)
+ {
+ m_state = ERROR;
+ Log(__FILE__, "Failed to write data to " + endpoint() + ". Reason: '" + strerror(errno) + "'.");
+ return false;
+ }
+ return true;
+}
+
+BASE_PARSER * Conn::GetParser(const std::string & tag) const
+{
+ BASE_PARSER::REGISTRY::const_iterator it = m_registry.find(ToLower(tag));
+ if (it == m_registry.end())
+ return NULL;
+ return it->second->create(*m_admin);
+}
+
+bool Conn::HandleBuffer(size_t size)
+{
+ if (m_state == DATA)
+ return HandleData(size);
+
+ if (m_bufferSize > 0)
+ return true;
+
+ switch (m_state)
+ {
+ case HEADER: return HandleHeader();
+ case LOGIN: return HandleLogin();
+ case CRYPTO_LOGIN: return HandleCryptoLogin();
+ default: return true;
+ }
+
+ return true;
+}
+
+bool Conn::HandleHeader()
+{
+ if (strncmp(m_header, STG_HEADER, sizeof(m_header)) != 0)
+ {
+ Log(__FILE__, "Received invalid header from " + endpoint() + ".");
+ WriteAnswer(ERR_HEADER, sizeof(ERR_HEADER) - 1); // Without \0
+ m_state = ERROR;
+ return false;
+ }
+ m_state = LOGIN;
+ m_buffer = m_login;
+ m_bufferSize = sizeof(m_login);
+ return WriteAnswer(OK_HEADER, sizeof(OK_HEADER) - 1); // Without \0
+}
+
+bool Conn::HandleLogin()
+{
+ if (m_admins.find(m_login, &m_admin)) // ADMINS::Find returns true on error.
+ {
+ std::string login(m_login, strnlen(m_login, sizeof(m_login)));
+ Log(__FILE__, "Received invalid login '" + ToPrintable(login) + "' from " + endpoint() + ".");
+ WriteAnswer(ERR_LOGIN, sizeof(ERR_LOGIN) - 1); // Without \0
+ m_state = ERROR;
+ return false;
+ }
+ m_admin->setIP(IP());
+ m_state = CRYPTO_LOGIN;
+ m_buffer = m_cryptoLogin;
+ m_bufferSize = sizeof(m_cryptoLogin);
+ return WriteAnswer(OK_LOGIN, sizeof(OK_LOGIN) - 1); // Without \0
+}
+
+bool Conn::HandleCryptoLogin()
+{
+ char login[ADM_LOGIN_LEN + 1];
+ BLOWFISH_CTX ctx;
+ InitContext(m_admin->password().c_str(), ADM_PASSWD_LEN, &ctx);
+ DecryptString(login, m_cryptoLogin, ADM_LOGIN_LEN, &ctx);
+
+ if (strncmp(m_login, login, sizeof(login)) != 0)
+ {
+ Log(__FILE__, "Attempt to connect with wrong password from " + m_admin->login() + "@" + endpoint() + ".");
+ WriteAnswer(ERR_LOGINS, sizeof(ERR_LOGINS) - 1); // Without \0
+ m_state = ERROR;
+ return false;
+ }
+
+ m_state = DATA;
+ m_buffer = m_data;
+ m_bufferSize = sizeof(m_data);
+ m_stream = new STG::DECRYPT_STREAM(m_admin->password(), DataCallback, &m_dataState);
+ return WriteAnswer(OK_LOGINS, sizeof(OK_LOGINS) - 1); // Without \0
+}
+
+bool Conn::HandleData(size_t size)
+{
+ m_stream->Put(m_data, size, size == 0 || memchr(m_data, 0, size) != NULL);
+ m_buffer = m_data;
+ return m_stream->IsOk();
+}
+
+bool Conn::DataCallback(const void * block, size_t size, void * data)
+{
+ assert(data != NULL);
+ DataState& state = *static_cast<DataState *>(data);
+
+ const char * xml = static_cast<const char *>(block);
+ size_t length = strnlen(xml, size);
+
+ state.final = state.final || length < size || size == 0;
+
+ if (XML_Parse(state.conn.m_xmlParser, xml, length, state.final) == XML_STATUS_ERROR)
+ {
+ state.conn.Log(__FILE__, "Received invalid XML from " + state.conn.m_admin->login() + "@" + state.conn.endpoint() + ".");
+ printfd(__FILE__, "XML parse error at line %d, %d: %s. Is final: %d\n",
+ static_cast<int>(XML_GetCurrentLineNumber(state.conn.m_xmlParser)),
+ static_cast<int>(XML_GetCurrentColumnNumber(state.conn.m_xmlParser)),
+ XML_ErrorString(XML_GetErrorCode(state.conn.m_xmlParser)), (int)state.final);
+ printfd(__FILE__, "Data block: '%s' of size %d\n", xml, length);
+ state.conn.m_state = ERROR;
+ return false;
+ }
+
+ if (state.final)
+ {
+ if (!state.conn.WriteResponse())
+ {
+ state.conn.Log(__FILE__, "Failed to write response to " + state.conn.m_admin->login() + "@" + state.conn.endpoint() + ".");
+ state.conn.m_state = ERROR;
+ return false;
+ }
+ state.conn.m_state = DONE;
+ }
+
+ return true;
+}
+
+void Conn::ParseXMLStart(void * data, const char * el, const char ** attr)
+{
+ assert(data != NULL);
+ Conn & conn = *static_cast<Conn *>(data);
+
+ if (conn.m_parser == NULL)
+ conn.m_parser = conn.GetParser(el);
+
+ if (conn.m_parser == NULL)
+ {
+ conn.Log(__FILE__, "Received unknown command '" + std::string(el) + "' from " + conn.m_admin->login() + "@" + conn.endpoint() + ".");
+ conn.m_state = ERROR;
+ return;
+ }
+
+ conn.m_parser->Start(data, el, attr);
+}
+
+void Conn::ParseXMLEnd(void * data, const char * el)
+{
+ assert(data != NULL);
+ Conn & conn = *static_cast<Conn *>(data);
+
+ if (conn.m_parser == NULL)
+ {
+ // No need to log it.
+ conn.m_state = ERROR;
+ return;
+ }
+
+ conn.m_parser->End(data, el);
+}
+
+bool Conn::WriteResponse()
+{
+ STG::ENCRYPT_STREAM stream(m_admin->password(), WriteCallback, this);
+ std::string answer;
+ if (m_parser != NULL)
+ answer = m_parser->GetAnswer();
+ else
+ answer = "<Error result=\"Unknown command.\"/>";
+ delete m_parser;
+ m_parser = NULL;
+ printfd(__FILE__, "Writing %d bytes of answer.\n", answer.length());
+ stream.Put(answer.c_str(), answer.length() + 1 /* including \0 */, true /* final */);
+ return stream.IsOk();
+}
+
+bool Conn::WriteCallback(const void * block, size_t size, void * data)
+{
+ assert(data != NULL);
+ Conn & conn = *static_cast<Conn *>(data);
+ return WriteAll(conn.m_sock, block, size);;
+}
+
+void Conn::Log(const char * file, const std::string & message)
+{
+ printfd(file, "%s\n", message.c_str());
+ m_logger(message);
+}
git.stg.codes / stg.git / blobdiff