tor-browser

agent.cc (7797B)

---

// Copyright 2022 The Chromium Authors.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include <regex>
#include <vector>

#include "content_analysis/sdk/analysis_agent.h"
#include "demo/handler.h"
#include "demo/handler_misbehaving.h"

using namespace content_analysis::sdk;

// Different paths are used depending on whether this agent should run as a
// use specific agent or not.  These values are chosen to match the test
// values in chrome browser.
constexpr char kPathUser[] = "path_user";
constexpr char kPathSystem[] = "brcm_chrm_cas";

// Global app config.
std::string path = kPathSystem;
bool use_queue = false;
bool user_specific = false;
std::vector<unsigned long> delays = {0};  // In milliseconds.
unsigned long num_threads = 8u;
std::string save_print_data_path = "";
RegexArray toBlock, toWarn, toReport;
static bool useMisbehavingHandler = false;
static std::string modeStr;

// Command line parameters.
constexpr const char* kArgDelaySpecific = "--delays=";
constexpr const char* kArgDelayMsSpecific = "--delaysMs=";
constexpr const char* kArgPath = "--path=";
constexpr const char* kArgQueued = "--queued";
constexpr const char* kArgThreads = "--threads=";
constexpr const char* kArgUserSpecific = "--user";
constexpr const char* kArgToBlock = "--toblock=";
constexpr const char* kArgToWarn = "--towarn=";
constexpr const char* kArgToReport = "--toreport=";
constexpr const char* kArgMisbehave = "--misbehave=";
constexpr const char* kArgHelp = "--help";
constexpr const char* kArgSavePrintRequestDataTo = "--save-print-request-data-to=";

std::map<std::string, Mode> sStringToMode = {
#define AGENT_MODE(name) {#name, Mode::Mode_##name},
#include "modes.h"
#undef AGENT_MODE
};

std::map<Mode, std::string> sModeToString = {
#define AGENT_MODE(name) {Mode::Mode_##name, #name},
#include "modes.h"
#undef AGENT_MODE
};

std::vector<std::pair<std::string, std::regex>>
ParseRegex(const std::string str) {
 std::vector<std::pair<std::string, std::regex>> ret;
 for (auto it = str.begin(); it != str.end(); /* nop */) {
   auto it2 = std::find(it, str.end(), ',');
   ret.push_back(std::make_pair(std::string(it, it2), std::regex(it, it2)));
   it = it2 == str.end() ? it2 : it2 + 1;
 }

 return ret;
}

bool ParseCommandLine(int argc, char* argv[]) {
 for (int i = 1; i < argc; ++i) {
   const std::string arg = argv[i];
   if (arg.find(kArgUserSpecific) == 0) {
     // If kArgPath was already used, abort.
     if (path != kPathSystem) {
       std::cout << std::endl << "ERROR: use --path=<path> after --user";
       return false;
     }
     path = kPathUser;
     user_specific = true;
   } else if ((arg.find(kArgDelaySpecific) == 0) ||
              (arg.find(kArgDelayMsSpecific) == 0)) {
     bool isSecs = (arg.find(kArgDelaySpecific) == 0);
     std::string delaysStr = arg.substr(strlen(isSecs ? kArgDelaySpecific : kArgDelayMsSpecific));
     unsigned long scale = isSecs ? 1000 : 1;
     delays.clear();
     size_t posStart = 0, posEnd;
     unsigned long delay;
     while ((posEnd = delaysStr.find(',', posStart)) != std::string::npos) {
       delay = std::stoul(delaysStr.substr(posStart, posEnd - posStart));
       delay = std::min(delay*scale, 30*1000ul);
       delays.push_back(delay);
       posStart = posEnd + 1;
     }
     delay = std::stoul(delaysStr.substr(posStart));
     delay = std::min(delay*scale, 30*1000ul);
     delays.push_back(delay);
   } else if (arg.find(kArgPath) == 0) {
     path = arg.substr(strlen(kArgPath));
   } else if (arg.find(kArgQueued) == 0) {
     use_queue = true;
   } else if (arg.find(kArgThreads) == 0) {
     num_threads = std::stoul(arg.substr(strlen(kArgThreads)));
   } else if (arg.find(kArgToBlock) == 0) {
     toBlock = ParseRegex(arg.substr(strlen(kArgToBlock)));
   } else if (arg.find(kArgToWarn) == 0) {
     toWarn = ParseRegex(arg.substr(strlen(kArgToWarn)));
   } else if (arg.find(kArgToReport) == 0) {
     toReport = ParseRegex(arg.substr(strlen(kArgToReport)));
   } else if (arg.find(kArgMisbehave) == 0) {
     modeStr = arg.substr(strlen(kArgMisbehave));
     useMisbehavingHandler = true;
   } else if (arg.find(kArgHelp) == 0) {
     return false;
   } else if (arg.find(kArgSavePrintRequestDataTo) == 0) {
     int arg_len = strlen(kArgSavePrintRequestDataTo);
     save_print_data_path = arg.substr(arg_len);
   }
 }

 return true;
}

void PrintHelp() {
 std::cout
   << std::endl << std::endl
   << "Usage: agent [OPTIONS]" << std::endl
   << "A simple agent to process content analysis requests." << std::endl
   << "Data containing the string 'block' blocks the request data from being used." << std::endl
   << std::endl << "Options:"  << std::endl
   << kArgDelaySpecific << "<delay1,delay2,...> : Add delays to request processing in seconds. Delays are limited to 30 seconds and are applied round-robin to requests. Default is 0." << std::endl
   << kArgDelayMsSpecific << "<delay1,delay2,...> : Like --delays but takes durations in milliseconds." << std::endl
   << kArgPath << " <path> : Used the specified path instead of default. Must come after --user." << std::endl
   << kArgQueued << " : Queue requests for processing in a background thread" << std::endl
   << kArgThreads << " : When queued, number of threads in the request processing thread pool" << std::endl
   << kArgUserSpecific << " : Make agent OS user specific." << std::endl
   << kArgHelp << " : prints this help message" << std::endl
   << kArgSavePrintRequestDataTo << " : saves the PDF data to the given file path for print requests" << std::endl
   << kArgToBlock << "<regex> : Regular expression matching file and text content to block." << std::endl
   << kArgToWarn << "<regex> : Regular expression matching file and text content to warn about." << std::endl
   << kArgToReport << "<regex> : Regular expression matching file and text content to report." << std::endl
   << kArgMisbehave << "<mode> : Use 'misbehaving' agent in given mode for testing purposes." << std::endl;
}

int main(int argc, char* argv[]) {
 if (!ParseCommandLine(argc, argv)) {
   PrintHelp();
   return 1;
 }

 auto handler =
   useMisbehavingHandler
     ? MisbehavingHandler::Create(modeStr, std::move(delays), save_print_data_path, std::move(toBlock), std::move(toWarn), std::move(toReport))
     : use_queue
       ? std::make_unique<QueuingHandler>(num_threads, std::move(delays), save_print_data_path, std::move(toBlock), std::move(toWarn), std::move(toReport))
       : std::make_unique<Handler>(std::move(delays), save_print_data_path, std::move(toBlock), std::move(toWarn), std::move(toReport));

 if (!handler) {
   std::cout << "[Demo] Failed to construct handler." << std::endl;
   return 1;
 }

 // Each agent uses a unique name to identify itself with Google Chrome.
 content_analysis::sdk::ResultCode rc;
 auto agent = content_analysis::sdk::Agent::Create(
     {path, user_specific}, std::move(handler), &rc);
 if (!agent || rc != content_analysis::sdk::ResultCode::OK) {
   std::cout << "[Demo] Error starting agent: "
             << content_analysis::sdk::ResultCodeToString(rc)
             << std::endl;
   return 1;
 };

 std::cout << "[Demo] " << agent->DebugString() << std::endl;

 // Blocks, sending events to the handler until agent->Stop() is called.
 rc = agent->HandleEvents();
 if (rc != content_analysis::sdk::ResultCode::OK) {
   std::cout << "[Demo] Error from handling events: "
             << content_analysis::sdk::ResultCodeToString(rc)
             << std::endl;
   std::cout << "[Demo] " << agent->DebugString() << std::endl;
 }

 return 0;
}