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/*
* Copyright (C) 2004-2025 ZNC, see the NOTICE file for details.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <znc/FileUtils.h>
#include <znc/IRCSock.h>
#include <znc/User.h>
#include <znc/IRCNetwork.h>
class CIdentFileModule : public CModule {
CString m_sOrigISpoof;
CFile* m_pISpoofLockFile;
CIRCSock* m_pIRCSock;
public:
MODCONSTRUCTOR(CIdentFileModule) {
AddHelpCommand();
AddCommand("GetFile", "", t_d("Show file name"),
[=](const CString& sLine) { GetFile(sLine); });
AddCommand("SetFile", t_d("<file>"), t_d("Set file name"),
[=](const CString& sLine) { SetFile(sLine); });
AddCommand("GetFormat", "", t_d("Show file format"),
[=](const CString& sLine) { GetFormat(sLine); });
AddCommand("SetFormat", t_d("<format>"), t_d("Set file format"),
[=](const CString& sLine) { SetFormat(sLine); });
AddCommand("Show", "", t_d("Show current state"),
[=](const CString& sLine) { Show(sLine); });
m_pISpoofLockFile = nullptr;
m_pIRCSock = nullptr;
}
~CIdentFileModule() override { ReleaseISpoof(); }
void GetFile(const CString& sLine) {
PutModule(t_f("File is set to: {1}")(GetNV("File")));
}
void SetFile(const CString& sLine) {
SetNV("File", sLine.Token(1, true));
PutModule(t_f("File has been set to: {1}")(GetNV("File")));
}
void SetFormat(const CString& sLine) {
SetNV("Format", sLine.Token(1, true));
PutModule(t_f("Format has been set to: {1}")(GetNV("Format")));
PutModule(t_f("Format would be expanded to: {1}")(
ExpandString(GetNV("Format"))));
}
void GetFormat(const CString& sLine) {
PutModule(t_f("Format is set to: {1}")(GetNV("Format")));
PutModule(t_f("Format would be expanded to: {1}")(
ExpandString(GetNV("Format"))));
}
void Show(const CString& sLine) {
PutModule("m_pISpoofLockFile = " +
CString((long long)m_pISpoofLockFile));
PutModule("m_pIRCSock = " + CString((long long)m_pIRCSock));
if (m_pIRCSock) {
PutModule("user/network - " +
m_pIRCSock->GetNetwork()->GetUser()->GetUsername() + "/" +
m_pIRCSock->GetNetwork()->GetName());
} else {
PutModule(t_s("identfile is free"));
}
}
void OnModCommand(const CString& sCommand) override {
if (GetUser()->IsAdmin()) {
HandleCommand(sCommand);
} else {
PutModule(t_s("Access denied"));
}
}
void SetIRCSock(CIRCSock* pIRCSock) {
if (m_pIRCSock) {
CZNC::Get().ResumeConnectQueue();
}
m_pIRCSock = pIRCSock;
if (m_pIRCSock) {
CZNC::Get().PauseConnectQueue();
}
}
bool WriteISpoof() {
if (m_pISpoofLockFile != nullptr) {
return false;
}
m_pISpoofLockFile = new CFile;
if (!m_pISpoofLockFile->TryExLock(GetNV("File"), O_RDWR | O_CREAT)) {
delete m_pISpoofLockFile;
m_pISpoofLockFile = nullptr;
return false;
}
char buf[1024];
memset((char*)buf, 0, 1024);
m_pISpoofLockFile->Read(buf, 1024);
m_sOrigISpoof = buf;
if (!m_pISpoofLockFile->Seek(0) || !m_pISpoofLockFile->Truncate()) {
delete m_pISpoofLockFile;
m_pISpoofLockFile = nullptr;
return false;
}
CString sData = ExpandString(GetNV("Format"));
// If the format doesn't contain anything expandable, we'll
// assume this is an "old"-style format string.
if (sData == GetNV("Format")) {
sData.Replace("%", GetUser()->GetIdent());
}
DEBUG("Writing [" + sData + "] to ident spoof file [" +
m_pISpoofLockFile->GetLongName() + "] for user/network [" +
GetUser()->GetUsername() + "/" + GetNetwork()->GetName() + "]");
m_pISpoofLockFile->Write(sData + "\n");
return true;
}
void ReleaseISpoof() {
DEBUG("Releasing ident spoof for user/network [" +
(m_pIRCSock
? m_pIRCSock->GetNetwork()->GetUser()->GetUsername() + "/" +
m_pIRCSock->GetNetwork()->GetName()
: "<no user/network>") +
"]");
SetIRCSock(nullptr);
if (m_pISpoofLockFile != nullptr) {
if (m_pISpoofLockFile->Seek(0) && m_pISpoofLockFile->Truncate()) {
m_pISpoofLockFile->Write(m_sOrigISpoof);
}
delete m_pISpoofLockFile;
m_pISpoofLockFile = nullptr;
}
}
bool OnLoad(const CString& sArgs, CString& sMessage) override {
m_pISpoofLockFile = nullptr;
m_pIRCSock = nullptr;
if (GetNV("Format").empty()) {
SetNV("Format", "global { reply \"%ident%\" }");
}
if (GetNV("File").empty()) {
SetNV("File", "~/.oidentd.conf");
}
return true;
}
EModRet OnIRCConnecting(CIRCSock* pIRCSock) override {
if (m_pISpoofLockFile != nullptr) {
DEBUG("Aborting connection, ident spoof lock file exists");
PutModule(
t_s("Aborting connection, another user or network is currently "
"connecting and using the ident spoof file"));
return HALTCORE;
}
if (!WriteISpoof()) {
DEBUG("identfile [" + GetNV("File") + "] could not be written");
PutModule(
t_f("[{1}] could not be written, retrying...")(GetNV("File")));
return HALTCORE;
}
SetIRCSock(pIRCSock);
return CONTINUE;
}
void OnIRCConnected() override {
if (m_pIRCSock == GetNetwork()->GetIRCSock()) {
ReleaseISpoof();
}
}
void OnIRCConnectionError(CIRCSock* pIRCSock) override {
if (m_pIRCSock == pIRCSock) {
ReleaseISpoof();
}
}
void OnIRCDisconnected() override {
if (m_pIRCSock == GetNetwork()->GetIRCSock()) {
ReleaseISpoof();
}
}
};
template <>
void TModInfo<CIdentFileModule>(CModInfo& Info) {
Info.SetWikiPage("identfile");
}
GLOBALMODULEDEFS(
CIdentFileModule,
t_s("Write the ident of a user to a file when they are trying to connect."))
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