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op-pedal/src/ConfigMain.cpp
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Robin Davies d8a6022947 First commit.
2021-08-15 12:42:46 -04:00

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#include <iostream>
#include "CommandLineParser.hpp"
#include "PiPedalException.hpp"
#include <filesystem>
#include <stdlib.h>
#include "WriteTemplateFile.hpp"
#include <fstream>
using namespace std;
using namespace pipedal;
#define SERVICE_ACCOUNT_NAME "pipedal_d"
#define SERVICE_GROUP_NAME "pipedal_d"
#define SERVICE_PATH "/usr/lib/systemd/system"
#define NATIVE_SERVICE "pipedald"
#define SHUTDOWN_SERVICE "pipedalshutdownd"
// #define REACT_SERVICE "pipedal_react"
bool exec(std::stringstream &s)
{
return system(s.str().c_str()) == EXIT_SUCCESS;
}
std::filesystem::path GetServiceFileName(const std::string &serviceName)
{
return std::filesystem::path(SERVICE_PATH) / (serviceName + ".service");
}
std::filesystem::path findOnPath(const std::string &command)
{
std::string path = getenv("PATH");
std::vector<std::string> paths;
size_t t = 0;
while (t < path.length())
{
size_t pos = path.find(':', t);
if (pos == string::npos)
{
pos = path.length();
}
std::string thisPath = path.substr(t, pos - t);
std::filesystem::path path = std::filesystem::path(thisPath) / command;
if (std::filesystem::exists(path))
{
return path;
}
t = pos + 1;
}
std::stringstream s;
s << "'" << command << "' is not installed.";
throw PiPedalException(s.str());
}
void EnableService()
{
if (system("systemctl enable " NATIVE_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to enable the " NATIVE_SERVICE " service.";
}
if (system("systemctl enable " SHUTDOWN_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to enable the " SHUTDOWN_SERVICE " service.";
}
}
void DisableService()
{
if (system("systemctl disable " NATIVE_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to disable the " NATIVE_SERVICE " service.";
}
if (system("systemctl disable " SHUTDOWN_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to disable the " SHUTDOWN_SERVICE " service.";
}
}
void StopService()
{
if (system("systemctl stop " NATIVE_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to stop the " NATIVE_SERVICE " service.";
}
if (system("systemctl stop " SHUTDOWN_SERVICE ".service") != EXIT_SUCCESS)
{
cout << "Error: Failed to stop the " SHUTDOWN_SERVICE " service.";
}
}
void StartService()
{
if (system("systemctl start " NATIVE_SERVICE ".service") != EXIT_SUCCESS)
{
throw PiPedalException("Failed to start the " NATIVE_SERVICE " service.");
}
if (system("systemctl start " SHUTDOWN_SERVICE ".service") != EXIT_SUCCESS)
{
throw PiPedalException("Failed to start the " SHUTDOWN_SERVICE " service.");
}
}
void RestartService()
{
StopService();
StartService();
}
void Install(const std::filesystem::path &programPrefix, const std::string endpointAddress)
{
auto endpos = endpointAddress.find_last_of(':');
if (endpos == string::npos)
{
throw PiPedalException("Invalid endpoint address: " + endpointAddress);
}
uint16_t port;
auto strPort = endpointAddress.substr(endpos + 1);
try
{
auto lport = std::stoul(strPort);
if (lport == 0 || lport >= std::numeric_limits<uint16_t>::max())
{
throw PiPedalException("out of range.");
}
port = (uint16_t)lport;
std::stringstream s;
s << port;
strPort = s.str(); // normalized.
}
catch (const std::exception &)
{
std::stringstream s;
s << "Invalid port number: " << strPort;
throw PiPedalException(s.str());
}
bool authBindRequired = port < 512;
// Create and configur service account.
if (system("groupadd -f " SERVICE_GROUP_NAME) != EXIT_SUCCESS)
{
throw PiPedalException("Failed to create service group.");
}
if (system("useradd " SERVICE_ACCOUNT_NAME " -g " SERVICE_GROUP_NAME " -M -N -r") != EXIT_SUCCESS)
{
// throw PiPedalException("Failed to create service account.");
}
system("usermod -a -G jack " SERVICE_ACCOUNT_NAME);
// create and configure /var directory.
std::filesystem::path varDirectory("/var/pipedal");
std::filesystem::create_directory(varDirectory);
{
std::stringstream s;
s << "chgrp " SERVICE_GROUP_NAME " " << varDirectory;
system(s.str().c_str());
}
{
std::stringstream s;
s << "chown " SERVICE_ACCOUNT_NAME << " " << varDirectory;
system(s.str().c_str());
}
{
std::stringstream s;
s << "chmod 775 " << varDirectory;
system(s.str().c_str());
}
{
std::stringstream s;
s << "chmod g+s " << varDirectory; // child files/directories inherit ownership.
system(s.str().c_str());
}
// authbind port.
if (authBindRequired)
{
std::filesystem::path portAuthFile = std::filesystem::path("/etc/authbind/byport") / strPort;
{
// create it.
std::ofstream f(portAuthFile);
}
{
// own it.
std::stringstream s;
s << "chown " SERVICE_ACCOUNT_NAME " " << portAuthFile;
exec(s);
}
{
// group own it.
std::stringstream s;
s << "chgrp " SERVICE_GROUP_NAME " " << portAuthFile;
exec(s);
}
{
std::stringstream s;
s << "chmod 770 " << portAuthFile;
exec(s);
}
}
cout << "Creating Systemd file." << endl;
std::map<string, string> map;
int shutdownPort = 3147;
map["DESCRIPTION"] = "PiPedal Web Service";
{
std::stringstream s;
if (authBindRequired)
{
s << findOnPath("authbind").string() << " --deep ";
}
s
<< (programPrefix / "bin/pipedald").string()
<< " /etc/pipedal/config /etc/pipedal/react -port " << endpointAddress << " -systemd -shutdownPort " << shutdownPort;
map["COMMAND"] = s.str();
}
WriteTemplateFile(map, std::filesystem::path("/etc/pipedal/template.service"), GetServiceFileName(NATIVE_SERVICE));
map["DESCRIPTION"] = "PiPedal Shutdown Service";
{
std::stringstream s;
s
<< (programPrefix / "bin/pipedalshutdownd").string()
<< " -port " << shutdownPort;
map["COMMAND"] = s.str();
}
WriteTemplateFile(map, std::filesystem::path("/etc/pipedal/templateShutdown.service"), GetServiceFileName(SHUTDOWN_SERVICE));
system("systemctl daemon-reload");
cout << "Starting service" << endl;
RestartService();
EnableService();
cout << "Complete" << endl;
}
int main(int argc, char **argv)
{
CommandLineParser parser;
bool install = false;
bool uninstall = false;
bool help = false;
bool stop = false, start = false;
bool enable = false, disable = false, restart = false;
std::string prefixOption;
std::string portOption;
parser.AddOption("-install", &install);
parser.AddOption("-uninstall", &uninstall);
parser.AddOption("-stop", &stop);
parser.AddOption("-start", &start);
parser.AddOption("-enable", &enable);
parser.AddOption("-disable", &disable);
parser.AddOption("-restart", &restart);
parser.AddOption("-h", &help);
parser.AddOption("--help", &help);
parser.AddOption("-prefix", &prefixOption);
parser.AddOption("-port", &portOption);
try
{
parser.Parse(argc, (const char **)argv);
int actionCount = install + uninstall + stop + start + enable + disable;
if (actionCount > 1)
{
throw PiPedalException("Please provide only one action.");
}
if (actionCount == 0)
{
help = true;
}
}
catch (const std::exception &e)
{
std::string s = e.what();
cout << "Error: " << s << endl;
exit(EXIT_FAILURE);
}
if (help || parser.Arguments().size() != 0)
{
cout << "pipedalconfig - Post-install configuration for pipdeal" << endl
<< "Copyright (c) 2021 Robin Davies. All rights reserved." << endl
<< endl
<< "Syntax:" << endl
<< " pipedalconfig [Options...]" << endl
<< "Options: " << endl
<< " -install Install services and service accounts." << endl
<< " -uninstall Remove installed services and service accounts." << endl
<< " -enable Start the pipedal at boot time." << endl
<< " -disable Do not start the pipedal at boot time." << endl
<< " -h --help Display this message." << endl
<< " -stop Stop the pipedal services." << endl
<< " -start Start the pipedal services." << endl
<< " -restart Restart the pipedal services." << endl
<< " -prefix Either /usr/local or /usr as appropriate for the install" << endl
<< " (only valid with the -install option)." << endl
<< " -port Port for the web server (only with -install option)." << endl
<< " Either a port (e.g. '81'), or a full endpoint (e.g.: " << endl
<< " '127.0.0.1:8080'). If no address is specified, the " << endl
<< " web server will listen on 0.0.0.0 (any)." << endl
<< endl
<< "Description:" << endl
<< " pipedalconfig performs post-install configuration of pipedal." << endl
<< endl;
exit(EXIT_SUCCESS);
}
if (portOption.size() != 0 && !install)
{
cout << "Error: -port option can only be specified with the -install option." << endl;
exit(EXIT_FAILURE);
}
try
{
std::filesystem::path prefix;
if (prefixOption.length() != 0)
{
prefix = std::filesystem::path(prefixOption);
}
else
{
prefix = std::filesystem::path(argv[0]).parent_path().parent_path();
std::filesystem::path pipedalPath = prefix / "bin/pipedald";
if (!std::filesystem::exists(pipedalPath))
{
std::stringstream s;
s << "Can't find pipedald executable at " << pipedalPath << ". Try again using the -prefix option.";
throw PiPedalException(s.str());
}
}
if (install)
{
if (portOption == "")
{
portOption = "80";
}
if (portOption.find(':') == string::npos)
{
portOption = "0.0.0.0:" + portOption;
}
Install(prefix, portOption);
}
else if (uninstall)
{
}
else if (stop)
{
StopService();
}
else if (start)
{
StartService();
}
else if (restart)
{
RestartService();
}
else if (enable)
{
EnableService();
}
else if (disable)
{
DisableService();
}
}
catch (const std::exception &e)
{
cout << "Error: " << e.what() << endl;
exit(EXIT_FAILURE);
}
}
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