Add a systemd Journal Export Format parser and dissector.

Add a file parser and dissector that can handle the output of
`journalctl -o export`. From here we can add a systemd journal extcap
and possibly support for the JSON and binary formats.

Change-Id: I01576959b2c347ce7ac9aa57cdb5c119c81d61e9
Reviewed-on: https://code.wireshark.org/review/29311
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 839 insertions, 0 deletions

diff --git a/epan/dissectors/packet-systemd-journal.c b/epan/dissectors/packet-systemd-journal.c
new file mode 100644
index 0000000000..f424ded49e
--- /dev/null
+++ b/epan/dissectors/packet-systemd-journal.c
@@ -0,0 +1,839 @@
+/* packet-systemd-journal-export.c
+ * Routines for systemd journal export (application/vnd.fdo.journal) dissection
+ * Copyright 2018, Gerald Combs <gerald@wireshark.org>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * Dissector for systemd's mostly-text-based Journal Export Format described
+ * at https://www.freedesktop.org/wiki/Software/systemd/export/.
+ *
+ * Registered MIME type: application/vnd.fdo.journal
+ *
+ * To do:
+ * - Add an extcap module.
+ * - Add errno strings.
+ * - Pretty-print _CAP_EFFECTIVE
+ * - Handle Journal JSON Format? https://www.freedesktop.org/wiki/Software/systemd/json/
+ * - Handle raw journal files? https://www.freedesktop.org/wiki/Software/systemd/journal-files/
+ */
+
+#include <config.h>
+
+#include <epan/exceptions.h>
+#include <epan/packet.h>
+#include <epan/expert.h>
+
+#include "packet-syslog.h"
+
+#define PNAME  "systemd Journal Entry"
+#define PSNAME "systemd Journal"
+#define PFNAME "systemd_journal"
+
+void proto_reg_handoff_systemd_journal(void);
+void proto_register_systemd_journal(void);
+
+/* Initialize the protocol and registered fields */
+static int proto_systemd_journal = -1;
+
+// Official entries, listed in
+// https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
+// as of 2018-08.
+static int hf_sj_message = -1;
+static int hf_sj_message_id = -1;
+static int hf_sj_priority = -1;
+static int hf_sj_code_file = -1;
+static int hf_sj_code_line = -1;
+static int hf_sj_code_func = -1;
+static int hf_sj_errno = -1;
+static int hf_sj_syslog_facility = -1;
+static int hf_sj_syslog_identifier = -1;
+static int hf_sj_syslog_pid = -1;
+
+static int hf_sj_pid = -1;
+static int hf_sj_uid = -1;
+static int hf_sj_gid = -1;
+static int hf_sj_comm = -1;
+static int hf_sj_exe = -1;
+static int hf_sj_cmdline = -1;
+static int hf_sj_cap_effective = -1;
+static int hf_sj_audit_session = -1;
+static int hf_sj_audit_loginuid = -1;
+static int hf_sj_systemd_cgroup = -1;
+static int hf_sj_systemd_slice = -1;
+static int hf_sj_systemd_unit = -1;
+static int hf_sj_systemd_user_unit = -1;
+static int hf_sj_systemd_session = -1;
+static int hf_sj_systemd_owner_uid = -1;
+
+static int hf_sj_selinux_context = -1;
+static int hf_sj_source_realtime_timestamp = -1;
+static int hf_sj_boot_id = -1;
+static int hf_sj_machine_id = -1;
+static int hf_sj_systemd_invocation_id = -1;
+static int hf_sj_hostname = -1;
+static int hf_sj_transport = -1;
+static int hf_sj_stream_id = -1;
+static int hf_sj_line_break = -1;
+
+static int hf_sj_kernel_device = -1;
+static int hf_sj_kernel_subsystem = -1;
+static int hf_sj_udev_sysname = -1;
+static int hf_sj_udev_devnode = -1;
+static int hf_sj_udev_devlink = -1;
+
+static int hf_sj_coredump_unit = -1;
+static int hf_sj_coredump_user_unit = -1;
+static int hf_sj_object_pid = -1;
+static int hf_sj_object_uid = -1;
+static int hf_sj_object_gid = -1;
+static int hf_sj_object_comm = -1;
+static int hf_sj_object_exe = -1;
+static int hf_sj_object_cmdline = -1;
+static int hf_sj_object_audit_session = -1;
+static int hf_sj_object_audit_loginuid = -1;
+static int hf_sj_object_systemd_cgroup = -1;
+static int hf_sj_object_systemd_session = -1;
+static int hf_sj_object_systemd_owner_uid = -1;
+static int hf_sj_object_systemd_unit = -1;
+static int hf_sj_object_systemd_user_unit = -1;
+
+static int hf_sj_cursor = -1;
+static int hf_sj_realtime_timestamp = -1;
+static int hf_sj_monotonic_timestamp = -1;
+
+// Unofficial(?) fields. Not listed in the documentation but present in logs.
+static int hf_sj_result = -1;
+static int hf_sj_source_monotonic_timestamp = -1;
+static int hf_sj_journal_name = -1;
+static int hf_sj_journal_path = -1;
+static int hf_sj_current_use = -1;
+static int hf_sj_current_use_pretty = -1;
+static int hf_sj_max_use = -1;
+static int hf_sj_max_use_pretty = -1;
+static int hf_sj_disk_keep_free = -1;
+static int hf_sj_disk_keep_free_pretty = -1;
+static int hf_sj_disk_available = -1;
+static int hf_sj_disk_available_pretty = -1;
+static int hf_sj_limit = -1;
+static int hf_sj_limit_pretty = -1;
+static int hf_sj_available = -1;
+static int hf_sj_available_pretty = -1;
+static int hf_sj_audit_type = -1;
+static int hf_sj_audit_id = -1;
+static int hf_sj_audit_field_apparmor = -1;
+static int hf_sj_audit_field_operation = -1;
+static int hf_sj_audit_field_profile = -1;
+static int hf_sj_audit_field_name = -1;
+static int hf_sj_seat_id = -1;
+static int hf_sj_kernel_usec = -1;
+static int hf_sj_userspace_usec = -1;
+static int hf_sj_session_id = -1;
+static int hf_sj_user_id = -1;
+static int hf_sj_leader = -1;
+
+// Metadata.
+static int hf_sj_binary_data_len = -1;
+static int hf_sj_unkown_field = -1;
+static int hf_sj_unkown_field_name = -1;
+static int hf_sj_unkown_field_value = -1;
+static int hf_sj_unkown_field_data = -1;
+static int hf_sj_unhandled_field_type = -1;
+
+static expert_field ei_unhandled_field_type = EI_INIT;
+static expert_field ei_nonbinary_field = EI_INIT;
+
+#define MAX_DATA_SIZE 262144 // WTAP_MAX_PACKET_SIZE_STANDARD. Increase if needed.
+
+/* Initialize the subtree pointers */
+static gint ett_systemd_journal_entry = -1;
+static gint ett_systemd_binary_data = -1;
+static gint ett_systemd_unknown_field = -1;
+
+// XXX Use a value_string instead?
+typedef struct _journal_field_hf_map {
+    int hfid;
+    const char *name;
+} journal_field_hf_map;
+
+static journal_field_hf_map *jf_to_hf;
+
+void init_jf_to_hf_map(void) {
+    journal_field_hf_map jhmap[] = {
+        // Official.
+        { hf_sj_message, "MESSAGE=" },
+        { hf_sj_message_id, "MESSAGE_ID=" },
+        { hf_sj_priority, "PRIORITY=" },
+        { hf_sj_code_file, "CODE_FILE=" },
+        { hf_sj_code_line, "CODE_LINE=" },
+        { hf_sj_code_func, "CODE_FUNC=" },
+        { hf_sj_result, "RESULT=" },
+        { hf_sj_errno, "ERRNO=" },
+        { hf_sj_syslog_facility, "SYSLOG_FACILITY=" },
+        { hf_sj_syslog_identifier, "SYSLOG_IDENTIFIER=" },
+        { hf_sj_syslog_pid, "SYSLOG_PID=" },
+
+        { hf_sj_pid, "_PID=" },
+        { hf_sj_uid, "_UID=" },
+        { hf_sj_gid, "_GID=" },
+        { hf_sj_comm, "_COMM=" },
+        { hf_sj_exe, "_EXE=" },
+        { hf_sj_cmdline, "_CMDLINE=" },
+        { hf_sj_cap_effective, "_CAP_EFFECTIVE=" },
+        { hf_sj_audit_session, "_AUDIT_SESSION=" },
+        { hf_sj_audit_loginuid, "_AUDIT_LOGINUID=" },
+        { hf_sj_systemd_cgroup, "_SYSTEMD_CGROUP=" },
+        { hf_sj_systemd_slice, "_SYSTEMD_SLICE=" },
+        { hf_sj_systemd_unit, "_SYSTEMD_UNIT=" },
+        { hf_sj_systemd_user_unit, "_SYSTEMD_USER_UNIT=" },
+        { hf_sj_systemd_session, "_SYSTEMD_SESSION=" },
+        { hf_sj_systemd_owner_uid, "_SYSTEMD_OWNER_UID=" },
+
+        { hf_sj_selinux_context, "_SELINUX_CONTEXT=" },
+        { hf_sj_source_realtime_timestamp, "_SOURCE_REALTIME_TIMESTAMP=" },
+        { hf_sj_source_monotonic_timestamp, "_SOURCE_MONOTONIC_TIMESTAMP=" },
+        { hf_sj_boot_id, "_BOOT_ID=" },
+        { hf_sj_machine_id, "_MACHINE_ID=" },
+        { hf_sj_systemd_invocation_id, "_SYSTEMD_INVOCATION_ID=" },
+        { hf_sj_hostname, "_HOSTNAME=" },
+        { hf_sj_transport, "_TRANSPORT=" },
+        { hf_sj_stream_id, "_STREAM_ID=" },
+        { hf_sj_line_break, "_LINE_BREAK=" },
+
+        { hf_sj_kernel_device, "_KERNEL_DEVICE=" },
+        { hf_sj_kernel_subsystem, "_KERNEL_SUBSYSTEM=" },
+        { hf_sj_udev_sysname, "_UDEV_SYSNAME=" },
+        { hf_sj_udev_devnode, "_UDEV_DEVNODE=" },
+        { hf_sj_udev_devlink, "_UDEV_DEVLINK=" },
+
+        { hf_sj_coredump_unit, "COREDUMP_UNIT=" },
+        { hf_sj_coredump_user_unit, "COREDUMP_USER_UNIT=" },
+        { hf_sj_object_pid, "OBJECT_PID=" },
+        { hf_sj_object_uid, "OBJECT_UID=" },
+        { hf_sj_object_gid, "OBJECT_GID=" },
+        { hf_sj_object_comm, "OBJECT_COMM=" },
+        { hf_sj_object_exe, "OBJECT_EXE=" },
+        { hf_sj_object_cmdline, "OBJECT_CMDLINE=" },
+        { hf_sj_object_audit_session, "OBJECT_AUDIT_SESSION=" },
+        { hf_sj_object_audit_loginuid, "OBJECT_AUDIT_LOGINUID=" },
+        { hf_sj_object_systemd_cgroup, "OBJECT_SYSTEMD_CGROUP=" },
+        { hf_sj_object_systemd_session, "OBJECT_SYSTEMD_SESSION=" },
+        { hf_sj_object_systemd_owner_uid, "OBJECT_SYSTEMD_OWNER_UID=" },
+        { hf_sj_object_systemd_unit, "OBJECT_SYSTEMD_UNIT=" },
+        { hf_sj_object_systemd_user_unit, "OBJECT_SYSTEMD_USER_UNIT=" },
+
+        { hf_sj_cursor, "__CURSOR=" },
+        { hf_sj_realtime_timestamp, "__REALTIME_TIMESTAMP=" },
+        { hf_sj_monotonic_timestamp, "__MONOTONIC_TIMESTAMP=" },
+
+        // Unofficial?
+        { hf_sj_journal_name, "JOURNAL_NAME=" }, // systemd-journald: Runtime journal (/run/log/journal/) is ...
+        { hf_sj_journal_path, "JOURNAL_PATH=" }, // ""
+        { hf_sj_current_use, "CURRENT_USE=" }, // ""
+        { hf_sj_current_use_pretty, "CURRENT_USE_PRETTY=" }, // ""
+        { hf_sj_max_use, "MAX_USE=" }, // ""
+        { hf_sj_max_use_pretty, "MAX_USE_PRETTY=" }, // ""
+        { hf_sj_disk_keep_free, "DISK_KEEP_FREE=" }, // ""
+        { hf_sj_disk_keep_free_pretty, "DISK_KEEP_FREE_PRETTY=" }, // ""
+        { hf_sj_disk_available, "DISK_AVAILABLE=" }, // ""
+        { hf_sj_disk_available_pretty, "DISK_AVAILABLE_PRETTY=" }, // ""
+        { hf_sj_limit, "LIMIT=" }, // ""
+        { hf_sj_limit_pretty, "LIMIT_PRETTY=" }, // ""
+        { hf_sj_available, "AVAILABLE=" }, // ""
+        { hf_sj_available_pretty, "AVAILABLE_PRETTY=" }, // ""
+        { hf_sj_code_func, "CODE_FUNCTION=" }, // Dup / alias of CODE_FUNC?
+        { hf_sj_systemd_user_unit, "UNIT=" }, // Dup / alias of _SYSTEMD_UNIT?
+        { hf_sj_systemd_user_unit, "USER_UNIT=" }, // Dup / alias of _SYSTEMD_USER_UNIT?
+        { hf_sj_audit_type, "_AUDIT_TYPE=" },
+        { hf_sj_audit_id, "_AUDIT_ID=" },
+        { hf_sj_audit_field_apparmor, "_AUDIT_FIELD_APPARMOR=" },
+        { hf_sj_audit_field_operation, "_AUDIT_FIELD_OPERATION=" },
+        { hf_sj_audit_field_profile, "_AUDIT_FIELD_PROFILE=" },
+        { hf_sj_audit_field_name, "_AUDIT_FIELD_NAME=" },
+        { hf_sj_seat_id, "SEAT_ID=" },
+        { hf_sj_kernel_usec, "KERNEL_USEC=" },
+        { hf_sj_userspace_usec, "USERSPACE_USEC" },
+        { hf_sj_session_id, "SESSION_ID" },
+        { hf_sj_user_id, "USER_ID" },
+        { hf_sj_leader, "LEADER" },
+        { 0, NULL }
+    };
+    jf_to_hf = (journal_field_hf_map*) g_memdup(jhmap, sizeof(jhmap));
+}
+
+static void
+dissect_sjle_time_usecs(proto_tree *tree, int hf_idx, tvbuff_t *tvb, int offset, int len) {
+    unsigned long rt_ts = strtoul(tvb_format_text(tvb, offset, len), NULL, 10);
+    // XXX Check errno?
+    nstime_t ts;
+    ts.secs = (time_t) rt_ts / 1000000;
+    ts.nsecs = (rt_ts % 1000000) * 1000;
+    proto_tree_add_time(tree, hf_idx, tvb, offset, len, &ts);
+}
+
+static void
+dissect_sjle_uint(proto_tree *tree, int hf_idx, tvbuff_t *tvb, int offset, int len) {
+    guint32 uint_val = (guint32) strtoul(tvb_format_text(tvb, offset, len), NULL, 10);
+    proto_tree_add_uint(tree, hf_idx, tvb, offset, len, uint_val);
+}
+
+static void
+dissect_sjle_int(proto_tree *tree, int hf_idx, tvbuff_t *tvb, int offset, int len) {
+    gint32 int_val = (gint32) strtol(tvb_format_text(tvb, offset, len), NULL, 10);
+    proto_tree_add_int(tree, hf_idx, tvb, offset, len, int_val);
+}
+
+/* Dissect a line-based journal export entry */
+static int
+dissect_systemd_journal_line_entry(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree,
+        void *data _U_)
+{
+    proto_item *ti;
+    proto_tree *sje_tree;
+    int         offset = 0, next_offset = 0;
+    int         line_len;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
+    col_clear(pinfo->cinfo, COL_INFO);
+    col_set_str(pinfo->cinfo, COL_INFO, "Journal Entry");
+
+    ti = proto_tree_add_item(tree, proto_systemd_journal, tvb, 0, -1, ENC_NA);
+    sje_tree = proto_item_add_subtree(ti, ett_systemd_journal_entry);
+
+    while ((line_len = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE)) >= 3) { // A=1
+        gboolean found = FALSE;
+        int eq_off = tvb_find_guint8(tvb, offset, line_len, '=') + 1;
+        int val_len = offset + line_len - eq_off;
+
+        for (int i = 0; jf_to_hf[i].name; i++) {
+            if (tvb_memeql(tvb, offset, (const guint8*) jf_to_hf[i].name, strlen(jf_to_hf[i].name)) == 0) {
+                int hf_idx = jf_to_hf[i].hfid;
+                switch (proto_registrar_get_ftype(hf_idx)) {
+                case FT_ABSOLUTE_TIME:
+                case FT_RELATIVE_TIME:
+                    dissect_sjle_time_usecs(sje_tree, hf_idx, tvb, eq_off, val_len);
+                    break;
+                case FT_UINT32:
+                case FT_UINT16:
+                case FT_UINT8:
+                    dissect_sjle_uint(sje_tree, hf_idx, tvb, eq_off, val_len);
+                    break;
+                case FT_INT32:
+                case FT_INT16:
+                case FT_INT8:
+                    dissect_sjle_int(sje_tree, hf_idx, tvb, eq_off, val_len);
+                    break;
+                case FT_STRING:
+                    proto_tree_add_item(sje_tree, jf_to_hf[i].hfid, tvb, eq_off, val_len, ENC_UTF_8|ENC_NA);
+                    break;
+                default:
+                {
+                    proto_item *expert_ti = proto_tree_add_item(sje_tree, hf_sj_unhandled_field_type, tvb, offset, line_len,
+                                                                    ENC_UTF_8|ENC_NA);
+                    expert_add_info(pinfo, expert_ti, &ei_unhandled_field_type);
+                    break;
+                }
+                }
+                if (hf_idx == hf_sj_message) {
+                    col_clear(pinfo->cinfo, COL_INFO);
+                    col_set_str(pinfo->cinfo, COL_INFO, tvb_format_text(tvb, eq_off, val_len));
+                }
+                found = TRUE;
+            }
+        }
+
+        if (!found && eq_off > offset + 1) {
+            proto_item *unk_ti = proto_tree_add_none_format(sje_tree, hf_sj_unkown_field, tvb, offset, line_len,
+                                                            "Unknown text field: %s", tvb_format_text(tvb, offset, eq_off - offset - 1));
+            proto_tree *unk_tree = proto_item_add_subtree(unk_ti, ett_systemd_unknown_field);
+            proto_tree_add_item(unk_tree, hf_sj_unkown_field_name, tvb, offset, eq_off - offset - 1, ENC_UTF_8|ENC_NA);
+            proto_tree_add_item(unk_tree, hf_sj_unkown_field_value, tvb, eq_off, val_len, ENC_UTF_8|ENC_NA);
+            offset = next_offset;
+            continue;
+        }
+
+        // Try again, looking for binary fields.
+        if (!found) {
+            for (int i = 0; jf_to_hf[i].name; i++) {
+                int noeql_len = (int) strlen(jf_to_hf[i].name) - 1;
+                if (tvb_memeql(tvb, offset, (const guint8 *) jf_to_hf[i].name, (size_t) noeql_len) == 0 && tvb_memeql(tvb, offset+noeql_len, (const guint8 *) "\n", 1) == 0) {
+                    int hf_idx = jf_to_hf[i].hfid;
+                    guint64 data_len = tvb_get_letoh64(tvb, offset + noeql_len + 1);
+                    int data_off = offset + noeql_len + 1 + 8; // \n + data len
+                    next_offset = data_off + (int) data_len + 1;
+                    if (proto_registrar_get_ftype(hf_idx) == FT_STRING) {
+                        proto_item *bin_ti = proto_tree_add_item(sje_tree, hf_idx, tvb, data_off, (int) data_len, ENC_NA);
+                        proto_tree *bin_tree = proto_item_add_subtree(bin_ti, ett_systemd_binary_data);
+                        proto_tree_add_item(bin_tree, hf_sj_binary_data_len, tvb, offset + noeql_len + 1, 8, ENC_LITTLE_ENDIAN);
+                        if (hf_idx == hf_sj_message) {
+                            col_clear(pinfo->cinfo, COL_INFO);
+                            col_set_str(pinfo->cinfo, COL_INFO, tvb_format_text(tvb, data_off, (int) data_len));
+                        }
+                    } else {
+                        proto_item *unk_ti = proto_tree_add_none_format(sje_tree, hf_sj_unkown_field, tvb, offset, line_len,
+                                                                        "Unknown data field: %s", tvb_format_text(tvb, offset, eq_off - offset - 1));
+                        proto_tree *unk_tree = proto_item_add_subtree(unk_ti, ett_systemd_unknown_field);
+                        proto_item *expert_ti = proto_tree_add_item(unk_tree, hf_sj_unkown_field_name, tvb, offset, offset + noeql_len, ENC_UTF_8|ENC_NA);
+                        proto_tree_add_item(unk_tree, hf_sj_unkown_field_data, tvb, data_off, (int) data_len, ENC_UTF_8|ENC_NA);
+                        expert_add_info(pinfo, expert_ti, &ei_nonbinary_field);
+                    }
+                }
+            }
+        }
+        offset = next_offset;
+    }
+
+    return offset;
+}
+
+/*
+ * Register the protocol with Wireshark.
+ */
+void
+proto_register_systemd_journal(void)
+{
+    expert_module_t *expert_systemd_journal;
+
+    static hf_register_info hf[] = {
+        { &hf_sj_message,
+          { "Message", "systemd_journal.message",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_message_id,
+          { "Message ID", "systemd_journal.message_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_priority,
+          { "Priority", "systemd_journal.priority",
+            FT_UINT8, BASE_DEC, VALS(syslog_level_vals), 0x0, NULL, HFILL }
+        },
+        { &hf_sj_code_file,
+          { "Code file", "systemd_journal.code_file",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_code_line,
+          { "Code line", "systemd_journal.code_line",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_code_func,
+          { "Code func", "systemd_journal.code_func",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_errno,
+          { "Errno", "systemd_journal.errno",
+            FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_syslog_facility,
+          { "Syslog facility", "systemd_journal.syslog_facility",
+            FT_UINT8, BASE_NONE, VALS(syslog_facility_vals), 0x0, NULL, HFILL }
+        },
+        { &hf_sj_syslog_identifier,
+          { "Syslog identifier", "systemd_journal.syslog_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_syslog_pid,
+          { "Syslog PID", "systemd_journal.syslog_pid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_pid,
+          { "PID", "systemd_journal.pid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_uid,
+          { "UID", "systemd_journal.uid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_gid,
+          { "GID", "systemd_journal.gid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_comm,
+          { "Command name", "systemd_journal.comm",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_exe,
+          { "Executable path", "systemd_journal.exe",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_cmdline,
+          { "Command line", "systemd_journal.cmdline",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_cap_effective,
+          { "Effective capability", "systemd_journal.cap_effective",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_session,
+          { "Audit session", "systemd_journal.audit_session",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_loginuid,
+          { "Audit login UID", "systemd_journal.audit_loginuid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_systemd_cgroup,
+          { "Systemd cgroup", "systemd_journal.systemd_cgroup",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_slice,
+          { "Systemd slice", "systemd_journal.systemd_slice",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_unit,
+          { "Systemd unit", "systemd_journal.systemd_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_user_unit,
+          { "Systemd user unit", "systemd_journal.systemd_user_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_session,
+          { "Systemd session", "systemd_journal.systemd_session",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_owner_uid,
+          { "Systemd owner UID", "systemd_journal.systemd_owner_uid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_selinux_context,
+          { "SELinux context", "systemd_journal.selinux_context",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_source_realtime_timestamp,
+          { "Source realtime timestamp", "systemd_journal.source_realtime_timestamp",
+            FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_boot_id,
+          { "Boot ID", "systemd_journal.boot_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_machine_id,
+          { "Machine ID", "systemd_journal.machine_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_systemd_invocation_id,
+          { "Systemd invocation ID", "systemd_journal.systemd_invocation_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_hostname,
+          { "Hostname", "systemd_journal.hostname",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_transport,
+          { "Transport", "systemd_journal.transport",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_stream_id,
+          { "Stream ID", "systemd_journal.stream_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_line_break,
+          { "Line break", "systemd_journal.line_break",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_kernel_device,
+          { "Kernel device", "systemd_journal.kernel_device",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_kernel_subsystem,
+          { "Kernel subsystem", "systemd_journal.kernel_subsystem",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_udev_sysname,
+          { "Device tree name", "systemd_journal.udev_sysname",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_udev_devnode,
+          { "Device tree node", "systemd_journal.udev_devnode",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_udev_devlink,
+          { "Device tree symlink", "systemd_journal.udev_devlink",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_coredump_unit,
+          { "Coredump unit", "systemd_journal.coredump_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_coredump_user_unit,
+          { "Coredump user unit", "systemd_journal.coredump_user_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_pid,
+          { "Object PID", "systemd_journal.object_pid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_uid,
+          { "Object UID", "systemd_journal.object_uid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_gid,
+          { "Object GID", "systemd_journal.object_gid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_comm,
+          { "Object command name", "systemd_journal.object_comm",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_exe,
+          { "Object executable path", "systemd_journal.object_exe",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_cmdline,
+          { "Object command line", "systemd_journal.object_cmdline",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_audit_session,
+          { "Object audit session", "systemd_journal.object_audit_session",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_audit_loginuid,
+          { "Object audit login UID", "systemd_journal.object_audit_loginuid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_systemd_cgroup,
+          { "Object systemd cgroup", "systemd_journal.object_systemd_cgroup",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_systemd_session,
+          { "Object systemd session", "systemd_journal.object_systemd_session",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_systemd_owner_uid,
+          { "Object systemd owner UID", "systemd_journal.object_systemd_owner_uid",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_systemd_unit,
+          { "Object systemd unit", "systemd_journal.object_systemd_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_object_systemd_user_unit,
+          { "Object systemd user unit", "systemd_journal.object_systemd_user_unit",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_cursor,
+          { "Cursor", "systemd_journal.cursor",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_realtime_timestamp,
+          { "Realtime Timestamp", "systemd_journal.realtime_timestamp",
+            FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_monotonic_timestamp,
+          { "Monotonic Timestamp", "systemd_journal.monotonic_timestamp",
+            FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_journal_name,
+          { "Journal name", "systemd_journal.journal_name",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_journal_path,
+          { "Journal path", "systemd_journal.journal_path",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_current_use,
+          { "Current use", "systemd_journal.current_use",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_current_use_pretty,
+          { "Human readable current use", "systemd_journal.current_use_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_max_use,
+          { "Max use", "systemd_journal.max_use",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_max_use_pretty,
+          { "Human readable max use", "systemd_journal.max_use_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_disk_keep_free,
+          { "Disk keep free", "systemd_journal.disk_keep_free",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_disk_keep_free_pretty,
+          { "Human readable disk keep free", "systemd_journal.disk_keep_free_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_disk_available,
+          { "Disk available", "systemd_journal.disk_available",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_disk_available_pretty,
+          { "Human readable disk available", "systemd_journal.disk_available_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_limit,
+          { "Limit", "systemd_journal.limit",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_limit_pretty,
+          { "Human readable limit", "systemd_journal.limit_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_available,
+          { "Available", "systemd_journal.available",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_available_pretty,
+          { "Human readable available", "systemd_journal.available_pretty",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_result,
+          { "Result", "systemd_journal.result",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_source_monotonic_timestamp,
+          { "Source monotonic timestamp", "systemd_journal.source_monotonic_timestamp",
+            FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_type,
+          { "Audit type", "systemd_journal.audit_type",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_id,
+          { "Audit ID", "systemd_journal.audit_id",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_field_apparmor,
+          { "Audit field AppArmor", "systemd_journal.audit_field_apparmor",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_field_operation,
+          { "Audit field operation", "systemd_journal.audit_field_operation",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_field_profile,
+          { "Audit field profile", "systemd_journal.audit_field_profile",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_audit_field_name,
+          { "Audit field name", "systemd_journal.audit_field_name",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_seat_id,
+          { "Seat ID", "systemd_journal.seat_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_kernel_usec,
+          { "Kernel microseconds", "systemd_journal.kernel_usec",
+            FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_userspace_usec,
+          { "Userspace microseconds", "systemd_journal.userspace_usec",
+            FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_session_id,
+          { "Session ID", "systemd_journal.session_id",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_user_id,
+          { "User ID", "systemd_journal.user_id",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_leader,
+          { "Leader", "systemd_journal.leader",
+            FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+
+        { &hf_sj_binary_data_len,
+          { "Binary data length", "systemd_journal.binary_data_len",
+            FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_unkown_field,
+          { "Unknown field", "systemd_journal.field",
+            FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_unkown_field_name,
+          { "Field name", "systemd_journal.field.name",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_unkown_field_value,
+          { "Field value", "systemd_journal.field.value",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_unkown_field_data,
+          { "Field data", "systemd_journal.field.data",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        },
+        { &hf_sj_unhandled_field_type,
+          { "Field data", "systemd_journal.unhandled_field_type",
+            FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
+        }
+    };
+
+    /* Setup protocol subtree array */
+    static gint *ett[] = {
+        &ett_systemd_journal_entry,
+        &ett_systemd_binary_data,
+        &ett_systemd_unknown_field
+    };
+
+    /* Setup protocol expert items */
+    static ei_register_info ei[] = {
+        { &ei_unhandled_field_type,
+          { "systemd_journal.unhandled_field_type", PI_UNDECODED, PI_ERROR,
+            "Unhandled field type", EXPFILL }
+        },
+        { &ei_nonbinary_field,
+          { "systemd_journal.nonbinary_field", PI_UNDECODED, PI_WARN,
+            "Field shouldn't be binary", EXPFILL }
+        }
+    };
+
+    /* Register the protocol name and description */
+    proto_systemd_journal = proto_register_protocol(PNAME, PSNAME, PFNAME);
+
+    /* Required function calls to register the header fields and subtrees */
+    proto_register_field_array(proto_systemd_journal, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+    /* Required function calls to register expert items */
+    expert_systemd_journal = expert_register_protocol(proto_systemd_journal);
+    expert_register_field_array(expert_systemd_journal, ei, array_length(ei));
+
+    init_jf_to_hf_map();
+}
+
+void
+proto_reg_handoff_systemd_journal(void)
+{
+    static dissector_handle_t sje_handle = NULL;
+
+    if (!sje_handle) {
+        sje_handle = create_dissector_handle(dissect_systemd_journal_line_entry,
+                proto_systemd_journal);
+    }
+
+    dissector_add_uint("wtap_encap", WTAP_ENCAP_SYSTEMD_JOURNAL, sje_handle);
+    // It's possible to ship journal entries over HTTP/HTTPS using
+    // systemd-journal-remote. Dissecting them on the wire isn't very
+    // useful since it's easy to end up with a packet containing a
+    // single, huge reassembled journal with many entries.
+    dissector_add_string("media_type", "application/vnd.fdo.journal", sje_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */