mirror of https://github.com/tstack/lnav.git
140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
/**
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* Copyright (c) 2021, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file pcap_manager.cc
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*/
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#include <memory>
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#include <thread>
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#include <vector>
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#include "pcap_manager.hh"
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#include <unistd.h>
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#include "base/fs_util.hh"
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#include "config.h"
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#include "line_buffer.hh"
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namespace pcap_manager {
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Result<convert_result, std::string>
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convert(const std::string& filename)
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{
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log_info("attempting to convert pcap file -- %s", filename.c_str());
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auto outfile = TRY(lnav::filesystem::open_temp_file(
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ghc::filesystem::temp_directory_path() / "lnav.pcap.XXXXXX"));
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ghc::filesystem::remove(outfile.first);
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auto err_pipe = TRY(auto_pipe::for_child_fd(STDERR_FILENO));
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auto child = TRY(lnav::pid::from_fork());
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err_pipe.after_fork(child.in());
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if (child.in_child()) {
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auto dev_null = open("/dev/null", O_RDONLY);
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dup2(dev_null, STDIN_FILENO);
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dup2(outfile.second.release(), STDOUT_FILENO);
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setenv("TZ", "UTC", 1);
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const char* args[] = {
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"tshark",
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"-T",
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"ek",
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"-P",
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"-V",
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"-t",
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"ad",
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"-r",
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filename.c_str(),
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nullptr,
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};
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execvp("tshark", (char**) args);
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if (errno == ENOENT) {
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fprintf(stderr,
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"pcap support requires 'tshark' v3+ to be installed\n");
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} else {
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fprintf(
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stderr, "failed to execute 'tshark' -- %s\n", strerror(errno));
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}
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_exit(EXIT_FAILURE);
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}
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auto error_queue = std::make_shared<std::vector<std::string>>();
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std::thread err_reader([err = std::move(err_pipe.read_end()),
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error_queue,
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child_pid = child.in()]() mutable {
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line_buffer lb;
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file_range pipe_range;
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bool done = false;
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lb.set_fd(err);
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while (!done) {
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auto load_res = lb.load_next_line(pipe_range);
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if (load_res.isErr()) {
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done = true;
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} else {
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auto li = load_res.unwrap();
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pipe_range = li.li_file_range;
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if (li.li_file_range.empty()) {
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done = true;
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} else {
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lb.read_range(li.li_file_range)
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.then([error_queue, child_pid](auto sbr) {
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auto line_str = string_fragment(
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sbr.get_data(), 0, sbr.length())
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.trim("\n");
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if (error_queue->size() < 5) {
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error_queue->emplace_back(line_str.to_string());
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}
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log_debug("pcap[%d]: %.*s",
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child_pid,
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line_str.length(),
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line_str.data());
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});
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}
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}
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}
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});
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err_reader.detach();
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log_info("started tshark %d to process file", child.in());
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return Ok(convert_result{
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std::move(child),
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std::move(outfile.second),
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error_queue,
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});
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}
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} // namespace pcap_manager
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