1 files changed, 139 insertions, 0 deletions
diff --git a/src/pcap_manager.cc b/src/pcap_manager.cc
new file mode 100644
index 0000000..dbe304a
--- /dev/null
+++ b/src/pcap_manager.cc
@@ -0,0 +1,139 @@
+/**
+ * Copyright (c) 2021, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file pcap_manager.cc
+ */
+
+#include <memory>
+#include <thread>
+#include <vector>
+
+#include "pcap_manager.hh"
+
+#include <unistd.h>
+
+#include "base/fs_util.hh"
+#include "config.h"
+#include "line_buffer.hh"
+
+namespace pcap_manager {
+
+Result<convert_result, std::string>
+convert(const std::string& filename)
+{
+    log_info("attempting to convert pcap file -- %s", filename.c_str());
+
+    auto outfile = TRY(lnav::filesystem::open_temp_file(
+        ghc::filesystem::temp_directory_path() / "lnav.pcap.XXXXXX"));
+    ghc::filesystem::remove(outfile.first);
+    auto err_pipe = TRY(auto_pipe::for_child_fd(STDERR_FILENO));
+    auto child = TRY(lnav::pid::from_fork());
+
+    err_pipe.after_fork(child.in());
+    if (child.in_child()) {
+        auto dev_null = open("/dev/null", O_RDONLY);
+
+        dup2(dev_null, STDIN_FILENO);
+        dup2(outfile.second.release(), STDOUT_FILENO);
+        setenv("TZ", "UTC", 1);
+
+        const char* args[] = {
+            "tshark",
+            "-T",
+            "ek",
+            "-P",
+            "-V",
+            "-t",
+            "ad",
+            "-r",
+            filename.c_str(),
+            nullptr,
+        };
+
+        execvp("tshark", (char**) args);
+        if (errno == ENOENT) {
+            fprintf(stderr,
+                    "pcap support requires 'tshark' v3+ to be installed\n");
+        } else {
+            fprintf(
+                stderr, "failed to execute 'tshark' -- %s\n", strerror(errno));
+        }
+        _exit(EXIT_FAILURE);
+    }
+
+    auto error_queue = std::make_shared<std::vector<std::string>>();
+    std::thread err_reader([err = std::move(err_pipe.read_end()),
+                            error_queue,
+                            child_pid = child.in()]() mutable {
+        line_buffer lb;
+        file_range pipe_range;
+        bool done = false;
+
+        lb.set_fd(err);
+        while (!done) {
+            auto load_res = lb.load_next_line(pipe_range);
+
+            if (load_res.isErr()) {
+                done = true;
+            } else {
+                auto li = load_res.unwrap();
+
+                pipe_range = li.li_file_range;
+                if (li.li_file_range.empty()) {
+                    done = true;
+                } else {
+                    lb.read_range(li.li_file_range)
+                        .then([error_queue, child_pid](auto sbr) {
+                            auto line_str = string_fragment(
+                                                sbr.get_data(), 0, sbr.length())
+                                                .trim("\n");
+                            if (error_queue->size() < 5) {
+                                error_queue->emplace_back(line_str.to_string());
+                            }
+
+                            log_debug("pcap[%d]: %.*s",
+                                      child_pid,
+                                      line_str.length(),
+                                      line_str.data());
+                        });
+                }
+            }
+        }
+    });
+    err_reader.detach();
+
+    log_info("started tshark %d to process file", child.in());
+
+    return Ok(convert_result{
+        std::move(child),
+        std::move(outfile.second),
+        error_queue,
+    });
+}
+
+}  // namespace pcap_manager