Move network-related journal programs to src/journal-remote/

Directory src/journal has become one of the largest directories,
and since systemd-journal-gatewayd, systemd-journal-remote, and
forthcoming systemd-journal-upload are all closely related, create
a separate directory for them.

1 files changed, 1054 insertions, 0 deletions

diff --git a/src/journal-remote/journal-gatewayd.c b/src/journal-remote/journal-gatewayd.c
new file mode 100644
index 0000000000..db07700111
--- /dev/null
+++ b/src/journal-remote/journal-gatewayd.c
@@ -0,0 +1,1054 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2012 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <getopt.h>
+
+#include <microhttpd.h>
+
+#ifdef HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#endif
+
+#include "log.h"
+#include "util.h"
+#include "sd-journal.h"
+#include "sd-daemon.h"
+#include "sd-bus.h"
+#include "bus-util.h"
+#include "logs-show.h"
+#include "microhttpd-util.h"
+#include "build.h"
+#include "fileio.h"
+
+static char *key_pem = NULL;
+static char *cert_pem = NULL;
+static char *trust_pem = NULL;
+
+typedef struct RequestMeta {
+        sd_journal *journal;
+
+        OutputMode mode;
+
+        char *cursor;
+        int64_t n_skip;
+        uint64_t n_entries;
+        bool n_entries_set;
+
+        FILE *tmp;
+        uint64_t delta, size;
+
+        int argument_parse_error;
+
+        bool follow;
+        bool discrete;
+
+        uint64_t n_fields;
+        bool n_fields_set;
+} RequestMeta;
+
+static const char* const mime_types[_OUTPUT_MODE_MAX] = {
+        [OUTPUT_SHORT] = "text/plain",
+        [OUTPUT_JSON] = "application/json",
+        [OUTPUT_JSON_SSE] = "text/event-stream",
+        [OUTPUT_EXPORT] = "application/vnd.fdo.journal",
+};
+
+static RequestMeta *request_meta(void **connection_cls) {
+        RequestMeta *m;
+
+        assert(connection_cls);
+        if (*connection_cls)
+                return *connection_cls;
+
+        m = new0(RequestMeta, 1);
+        if (!m)
+                return NULL;
+
+        *connection_cls = m;
+        return m;
+}
+
+static void request_meta_free(
+                void *cls,
+                struct MHD_Connection *connection,
+                void **connection_cls,
+                enum MHD_RequestTerminationCode toe) {
+
+        RequestMeta *m = *connection_cls;
+
+        if (!m)
+                return;
+
+        if (m->journal)
+                sd_journal_close(m->journal);
+
+        if (m->tmp)
+                fclose(m->tmp);
+
+        free(m->cursor);
+        free(m);
+}
+
+static int open_journal(RequestMeta *m) {
+        assert(m);
+
+        if (m->journal)
+                return 0;
+
+        return sd_journal_open(&m->journal, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM);
+}
+
+static ssize_t request_reader_entries(
+                void *cls,
+                uint64_t pos,
+                char *buf,
+                size_t max) {
+
+        RequestMeta *m = cls;
+        int r;
+        size_t n, k;
+
+        assert(m);
+        assert(buf);
+        assert(max > 0);
+        assert(pos >= m->delta);
+
+        pos -= m->delta;
+
+        while (pos >= m->size) {
+                off_t sz;
+
+                /* End of this entry, so let's serialize the next
+                 * one */
+
+                if (m->n_entries_set &&
+                    m->n_entries <= 0)
+                        return MHD_CONTENT_READER_END_OF_STREAM;
+
+                if (m->n_skip < 0)
+                        r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip + 1);
+                else if (m->n_skip > 0)
+                        r = sd_journal_next_skip(m->journal, (uint64_t) m->n_skip + 1);
+                else
+                        r = sd_journal_next(m->journal);
+
+                if (r < 0) {
+                        log_error("Failed to advance journal pointer: %s", strerror(-r));
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                } else if (r == 0) {
+
+                        if (m->follow) {
+                                r = sd_journal_wait(m->journal, (uint64_t) -1);
+                                if (r < 0) {
+                                        log_error("Couldn't wait for journal event: %s", strerror(-r));
+                                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                                }
+
+                                continue;
+                        }
+
+                        return MHD_CONTENT_READER_END_OF_STREAM;
+                }
+
+                if (m->discrete) {
+                        assert(m->cursor);
+
+                        r = sd_journal_test_cursor(m->journal, m->cursor);
+                        if (r < 0) {
+                                log_error("Failed to test cursor: %s", strerror(-r));
+                                return MHD_CONTENT_READER_END_WITH_ERROR;
+                        }
+
+                        if (r == 0)
+                                return MHD_CONTENT_READER_END_OF_STREAM;
+                }
+
+                pos -= m->size;
+                m->delta += m->size;
+
+                if (m->n_entries_set)
+                        m->n_entries -= 1;
+
+                m->n_skip = 0;
+
+                if (m->tmp)
+                        rewind(m->tmp);
+                else {
+                        m->tmp = tmpfile();
+                        if (!m->tmp) {
+                                log_error("Failed to create temporary file: %m");
+                                return MHD_CONTENT_READER_END_WITH_ERROR;
+                        }
+                }
+
+                r = output_journal(m->tmp, m->journal, m->mode, 0, OUTPUT_FULL_WIDTH, NULL);
+                if (r < 0) {
+                        log_error("Failed to serialize item: %s", strerror(-r));
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                }
+
+                sz = ftello(m->tmp);
+                if (sz == (off_t) -1) {
+                        log_error("Failed to retrieve file position: %m");
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                }
+
+                m->size = (uint64_t) sz;
+        }
+
+        if (fseeko(m->tmp, pos, SEEK_SET) < 0) {
+                log_error("Failed to seek to position: %m");
+                return MHD_CONTENT_READER_END_WITH_ERROR;
+        }
+
+        n = m->size - pos;
+        if (n > max)
+                n = max;
+
+        errno = 0;
+        k = fread(buf, 1, n, m->tmp);
+        if (k != n) {
+                log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF");
+                return MHD_CONTENT_READER_END_WITH_ERROR;
+        }
+
+        return (ssize_t) k;
+}
+
+static int request_parse_accept(
+                RequestMeta *m,
+                struct MHD_Connection *connection) {
+
+        const char *header;
+
+        assert(m);
+        assert(connection);
+
+        header = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Accept");
+        if (!header)
+                return 0;
+
+        if (streq(header, mime_types[OUTPUT_JSON]))
+                m->mode = OUTPUT_JSON;
+        else if (streq(header, mime_types[OUTPUT_JSON_SSE]))
+                m->mode = OUTPUT_JSON_SSE;
+        else if (streq(header, mime_types[OUTPUT_EXPORT]))
+                m->mode = OUTPUT_EXPORT;
+        else
+                m->mode = OUTPUT_SHORT;
+
+        return 0;
+}
+
+static int request_parse_range(
+                RequestMeta *m,
+                struct MHD_Connection *connection) {
+
+        const char *range, *colon, *colon2;
+        int r;
+
+        assert(m);
+        assert(connection);
+
+        range = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Range");
+        if (!range)
+                return 0;
+
+        if (!startswith(range, "entries="))
+                return 0;
+
+        range += 8;
+        range += strspn(range, WHITESPACE);
+
+        colon = strchr(range, ':');
+        if (!colon)
+                m->cursor = strdup(range);
+        else {
+                const char *p;
+
+                colon2 = strchr(colon + 1, ':');
+                if (colon2) {
+                        _cleanup_free_ char *t;
+
+                        t = strndup(colon + 1, colon2 - colon - 1);
+                        if (!t)
+                                return -ENOMEM;
+
+                        r = safe_atoi64(t, &m->n_skip);
+                        if (r < 0)
+                                return r;
+                }
+
+                p = (colon2 ? colon2 : colon) + 1;
+                if (*p) {
+                        r = safe_atou64(p, &m->n_entries);
+                        if (r < 0)
+                                return r;
+
+                        if (m->n_entries <= 0)
+                                return -EINVAL;
+
+                        m->n_entries_set = true;
+                }
+
+                m->cursor = strndup(range, colon - range);
+        }
+
+        if (!m->cursor)
+                return -ENOMEM;
+
+        m->cursor[strcspn(m->cursor, WHITESPACE)] = 0;
+        if (isempty(m->cursor)) {
+                free(m->cursor);
+                m->cursor = NULL;
+        }
+
+        return 0;
+}
+
+static int request_parse_arguments_iterator(
+                void *cls,
+                enum MHD_ValueKind kind,
+                const char *key,
+                const char *value) {
+
+        RequestMeta *m = cls;
+        _cleanup_free_ char *p = NULL;
+        int r;
+
+        assert(m);
+
+        if (isempty(key)) {
+                m->argument_parse_error = -EINVAL;
+                return MHD_NO;
+        }
+
+        if (streq(key, "follow")) {
+                if (isempty(value)) {
+                        m->follow = true;
+                        return MHD_YES;
+                }
+
+                r = parse_boolean(value);
+                if (r < 0) {
+                        m->argument_parse_error = r;
+                        return MHD_NO;
+                }
+
+                m->follow = r;
+                return MHD_YES;
+        }
+
+        if (streq(key, "discrete")) {
+                if (isempty(value)) {
+                        m->discrete = true;
+                        return MHD_YES;
+                }
+
+                r = parse_boolean(value);
+                if (r < 0) {
+                        m->argument_parse_error = r;
+                        return MHD_NO;
+                }
+
+                m->discrete = r;
+                return MHD_YES;
+        }
+
+        if (streq(key, "boot")) {
+                if (isempty(value))
+                        r = true;
+                else {
+                        r = parse_boolean(value);
+                        if (r < 0) {
+                                m->argument_parse_error = r;
+                                return MHD_NO;
+                        }
+                }
+
+                if (r) {
+                        char match[9 + 32 + 1] = "_BOOT_ID=";
+                        sd_id128_t bid;
+
+                        r = sd_id128_get_boot(&bid);
+                        if (r < 0) {
+                                log_error("Failed to get boot ID: %s", strerror(-r));
+                                return MHD_NO;
+                        }
+
+                        sd_id128_to_string(bid, match + 9);
+                        r = sd_journal_add_match(m->journal, match, sizeof(match)-1);
+                        if (r < 0) {
+                                m->argument_parse_error = r;
+                                return MHD_NO;
+                        }
+                }
+
+                return MHD_YES;
+        }
+
+        p = strjoin(key, "=", strempty(value), NULL);
+        if (!p) {
+                m->argument_parse_error = log_oom();
+                return MHD_NO;
+        }
+
+        r = sd_journal_add_match(m->journal, p, 0);
+        if (r < 0) {
+                m->argument_parse_error = r;
+                return MHD_NO;
+        }
+
+        return MHD_YES;
+}
+
+static int request_parse_arguments(
+                RequestMeta *m,
+                struct MHD_Connection *connection) {
+
+        assert(m);
+        assert(connection);
+
+        m->argument_parse_error = 0;
+        MHD_get_connection_values(connection, MHD_GET_ARGUMENT_KIND, request_parse_arguments_iterator, m);
+
+        return m->argument_parse_error;
+}
+
+static int request_handler_entries(
+                struct MHD_Connection *connection,
+                void *connection_cls) {
+
+        struct MHD_Response *response;
+        RequestMeta *m = connection_cls;
+        int r;
+
+        assert(connection);
+        assert(m);
+
+        r = open_journal(m);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+
+        if (request_parse_accept(m, connection) < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
+
+        if (request_parse_range(m, connection) < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Range header.\n");
+
+        if (request_parse_arguments(m, connection) < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse URL arguments.\n");
+
+        if (m->discrete) {
+                if (!m->cursor)
+                        return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Discrete seeks require a cursor specification.\n");
+
+                m->n_entries = 1;
+                m->n_entries_set = true;
+        }
+
+        if (m->cursor)
+                r = sd_journal_seek_cursor(m->journal, m->cursor);
+        else if (m->n_skip >= 0)
+                r = sd_journal_seek_head(m->journal);
+        else if (m->n_skip < 0)
+                r = sd_journal_seek_tail(m->journal);
+        if (r < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to seek in journal.\n");
+
+        response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_entries, m, NULL);
+        if (!response)
+                return respond_oom(connection);
+
+        MHD_add_response_header(response, "Content-Type", mime_types[m->mode]);
+
+        r = MHD_queue_response(connection, MHD_HTTP_OK, response);
+        MHD_destroy_response(response);
+
+        return r;
+}
+
+static int output_field(FILE *f, OutputMode m, const char *d, size_t l) {
+        const char *eq;
+        size_t j;
+
+        eq = memchr(d, '=', l);
+        if (!eq)
+                return -EINVAL;
+
+        j = l - (eq - d + 1);
+
+        if (m == OUTPUT_JSON) {
+                fprintf(f, "{ \"%.*s\" : ", (int) (eq - d), d);
+                json_escape(f, eq+1, j, OUTPUT_FULL_WIDTH);
+                fputs(" }\n", f);
+        } else {
+                fwrite(eq+1, 1, j, f);
+                fputc('\n', f);
+        }
+
+        return 0;
+}
+
+static ssize_t request_reader_fields(
+                void *cls,
+                uint64_t pos,
+                char *buf,
+                size_t max) {
+
+        RequestMeta *m = cls;
+        int r;
+        size_t n, k;
+
+        assert(m);
+        assert(buf);
+        assert(max > 0);
+        assert(pos >= m->delta);
+
+        pos -= m->delta;
+
+        while (pos >= m->size) {
+                off_t sz;
+                const void *d;
+                size_t l;
+
+                /* End of this field, so let's serialize the next
+                 * one */
+
+                if (m->n_fields_set &&
+                    m->n_fields <= 0)
+                        return MHD_CONTENT_READER_END_OF_STREAM;
+
+                r = sd_journal_enumerate_unique(m->journal, &d, &l);
+                if (r < 0) {
+                        log_error("Failed to advance field index: %s", strerror(-r));
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                } else if (r == 0)
+                        return MHD_CONTENT_READER_END_OF_STREAM;
+
+                pos -= m->size;
+                m->delta += m->size;
+
+                if (m->n_fields_set)
+                        m->n_fields -= 1;
+
+                if (m->tmp)
+                        rewind(m->tmp);
+                else {
+                        m->tmp = tmpfile();
+                        if (!m->tmp) {
+                                log_error("Failed to create temporary file: %m");
+                                return MHD_CONTENT_READER_END_WITH_ERROR;
+                        }
+                }
+
+                r = output_field(m->tmp, m->mode, d, l);
+                if (r < 0) {
+                        log_error("Failed to serialize item: %s", strerror(-r));
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                }
+
+                sz = ftello(m->tmp);
+                if (sz == (off_t) -1) {
+                        log_error("Failed to retrieve file position: %m");
+                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                }
+
+                m->size = (uint64_t) sz;
+        }
+
+        if (fseeko(m->tmp, pos, SEEK_SET) < 0) {
+                log_error("Failed to seek to position: %m");
+                return MHD_CONTENT_READER_END_WITH_ERROR;
+        }
+
+        n = m->size - pos;
+        if (n > max)
+                n = max;
+
+        errno = 0;
+        k = fread(buf, 1, n, m->tmp);
+        if (k != n) {
+                log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF");
+                return MHD_CONTENT_READER_END_WITH_ERROR;
+        }
+
+        return (ssize_t) k;
+}
+
+static int request_handler_fields(
+                struct MHD_Connection *connection,
+                const char *field,
+                void *connection_cls) {
+
+        struct MHD_Response *response;
+        RequestMeta *m = connection_cls;
+        int r;
+
+        assert(connection);
+        assert(m);
+
+        r = open_journal(m);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+
+        if (request_parse_accept(m, connection) < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
+
+        r = sd_journal_query_unique(m->journal, field);
+        if (r < 0)
+                return mhd_respond(connection, MHD_HTTP_BAD_REQUEST, "Failed to query unique fields.\n");
+
+        response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_fields, m, NULL);
+        if (!response)
+                return respond_oom(connection);
+
+        MHD_add_response_header(response, "Content-Type", mime_types[m->mode == OUTPUT_JSON ? OUTPUT_JSON : OUTPUT_SHORT]);
+
+        r = MHD_queue_response(connection, MHD_HTTP_OK, response);
+        MHD_destroy_response(response);
+
+        return r;
+}
+
+static int request_handler_redirect(
+                struct MHD_Connection *connection,
+                const char *target) {
+
+        char *page;
+        struct MHD_Response *response;
+        int ret;
+
+        assert(connection);
+        assert(target);
+
+        if (asprintf(&page, "<html><body>Please continue to the <a href=\"%s\">journal browser</a>.</body></html>", target) < 0)
+                return respond_oom(connection);
+
+        response = MHD_create_response_from_buffer(strlen(page), page, MHD_RESPMEM_MUST_FREE);
+        if (!response) {
+                free(page);
+                return respond_oom(connection);
+        }
+
+        MHD_add_response_header(response, "Content-Type", "text/html");
+        MHD_add_response_header(response, "Location", target);
+
+        ret = MHD_queue_response(connection, MHD_HTTP_MOVED_PERMANENTLY, response);
+        MHD_destroy_response(response);
+
+        return ret;
+}
+
+static int request_handler_file(
+                struct MHD_Connection *connection,
+                const char *path,
+                const char *mime_type) {
+
+        struct MHD_Response *response;
+        int ret;
+        _cleanup_close_ int fd = -1;
+        struct stat st;
+
+        assert(connection);
+        assert(path);
+        assert(mime_type);
+
+        fd = open(path, O_RDONLY|O_CLOEXEC);
+        if (fd < 0)
+                return mhd_respondf(connection, MHD_HTTP_NOT_FOUND, "Failed to open file %s: %m\n", path);
+
+        if (fstat(fd, &st) < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to stat file: %m\n");
+
+        response = MHD_create_response_from_fd_at_offset(st.st_size, fd, 0);
+        if (!response)
+                return respond_oom(connection);
+
+        fd = -1;
+
+        MHD_add_response_header(response, "Content-Type", mime_type);
+
+        ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
+        MHD_destroy_response(response);
+
+        return ret;
+}
+
+static int get_virtualization(char **v) {
+        _cleanup_bus_unref_ sd_bus *bus = NULL;
+        char *b = NULL;
+        int r;
+
+        r = sd_bus_default_system(&bus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_get_property_string(
+                        bus,
+                        "org.freedesktop.systemd1",
+                        "/org/freedesktop/systemd1",
+                        "org.freedesktop.systemd1.Manager",
+                        "Virtualization",
+                        NULL,
+                        &b);
+        if (r < 0)
+                return r;
+
+        if (isempty(b)) {
+                free(b);
+                *v = NULL;
+                return 0;
+        }
+
+        *v = b;
+        return 1;
+}
+
+static int request_handler_machine(
+                struct MHD_Connection *connection,
+                void *connection_cls) {
+
+        struct MHD_Response *response;
+        RequestMeta *m = connection_cls;
+        int r;
+        _cleanup_free_ char* hostname = NULL, *os_name = NULL;
+        uint64_t cutoff_from = 0, cutoff_to = 0, usage;
+        char *json;
+        sd_id128_t mid, bid;
+        _cleanup_free_ char *v = NULL;
+
+        assert(connection);
+        assert(m);
+
+        r = open_journal(m);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+
+        r = sd_id128_get_machine(&mid);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine machine ID: %s\n", strerror(-r));
+
+        r = sd_id128_get_boot(&bid);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine boot ID: %s\n", strerror(-r));
+
+        hostname = gethostname_malloc();
+        if (!hostname)
+                return respond_oom(connection);
+
+        r = sd_journal_get_usage(m->journal, &usage);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
+
+        r = sd_journal_get_cutoff_realtime_usec(m->journal, &cutoff_from, &cutoff_to);
+        if (r < 0)
+                return mhd_respondf(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
+
+        if (parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL) == -ENOENT)
+                parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL);
+
+        get_virtualization(&v);
+
+        r = asprintf(&json,
+                     "{ \"machine_id\" : \"" SD_ID128_FORMAT_STR "\","
+                     "\"boot_id\" : \"" SD_ID128_FORMAT_STR "\","
+                     "\"hostname\" : \"%s\","
+                     "\"os_pretty_name\" : \"%s\","
+                     "\"virtualization\" : \"%s\","
+                     "\"usage\" : \"%"PRIu64"\","
+                     "\"cutoff_from_realtime\" : \"%"PRIu64"\","
+                     "\"cutoff_to_realtime\" : \"%"PRIu64"\" }\n",
+                     SD_ID128_FORMAT_VAL(mid),
+                     SD_ID128_FORMAT_VAL(bid),
+                     hostname_cleanup(hostname, false),
+                     os_name ? os_name : "Linux",
+                     v ? v : "bare",
+                     usage,
+                     cutoff_from,
+                     cutoff_to);
+
+        if (r < 0)
+                return respond_oom(connection);
+
+        response = MHD_create_response_from_buffer(strlen(json), json, MHD_RESPMEM_MUST_FREE);
+        if (!response) {
+                free(json);
+                return respond_oom(connection);
+        }
+
+        MHD_add_response_header(response, "Content-Type", "application/json");
+        r = MHD_queue_response(connection, MHD_HTTP_OK, response);
+        MHD_destroy_response(response);
+
+        return r;
+}
+
+static int request_handler(
+                void *cls,
+                struct MHD_Connection *connection,
+                const char *url,
+                const char *method,
+                const char *version,
+                const char *upload_data,
+                size_t *upload_data_size,
+                void **connection_cls) {
+        int r, code;
+
+        assert(connection);
+        assert(connection_cls);
+        assert(url);
+        assert(method);
+
+        if (!streq(method, "GET"))
+                return mhd_respond(connection, MHD_HTTP_METHOD_NOT_ACCEPTABLE,
+                                   "Unsupported method.\n");
+
+
+        if (!*connection_cls) {
+                if (!request_meta(connection_cls))
+                        return respond_oom(connection);
+                return MHD_YES;
+        }
+
+        if (trust_pem) {
+                r = check_permissions(connection, &code);
+                if (r < 0)
+                        return code;
+        }
+
+        if (streq(url, "/"))
+                return request_handler_redirect(connection, "/browse");
+
+        if (streq(url, "/entries"))
+                return request_handler_entries(connection, *connection_cls);
+
+        if (startswith(url, "/fields/"))
+                return request_handler_fields(connection, url + 8, *connection_cls);
+
+        if (streq(url, "/browse"))
+                return request_handler_file(connection, DOCUMENT_ROOT "/browse.html", "text/html");
+
+        if (streq(url, "/machine"))
+                return request_handler_machine(connection, *connection_cls);
+
+        return mhd_respond(connection, MHD_HTTP_NOT_FOUND, "Not found.\n");
+}
+
+static int help(void) {
+
+        printf("%s [OPTIONS...] ...\n\n"
+               "HTTP server for journal events.\n\n"
+               "  -h --help           Show this help\n"
+               "     --version        Show package version\n"
+               "     --cert=CERT.PEM  Server certificate in PEM format\n"
+               "     --key=KEY.PEM    Server key in PEM format\n"
+               "     --trust=CERT.PEM Certificat authority certificate in PEM format\n",
+               program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_KEY,
+                ARG_CERT,
+                ARG_TRUST,
+        };
+
+        int r, c;
+
+        static const struct option options[] = {
+                { "help",    no_argument,       NULL, 'h'         },
+                { "version", no_argument,       NULL, ARG_VERSION },
+                { "key",     required_argument, NULL, ARG_KEY     },
+                { "cert",    required_argument, NULL, ARG_CERT    },
+                { "trust",   required_argument, NULL, ARG_TRUST   },
+                {}
+        };
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+
+                switch(c) {
+
+                case 'h':
+                        return help();
+
+                case ARG_VERSION:
+                        puts(PACKAGE_STRING);
+                        puts(SYSTEMD_FEATURES);
+                        return 0;
+
+                case ARG_KEY:
+                        if (key_pem) {
+                                log_error("Key file specified twice");
+                                return -EINVAL;
+                        }
+                        r = read_full_file(optarg, &key_pem, NULL);
+                        if (r < 0) {
+                                log_error("Failed to read key file: %s", strerror(-r));
+                                return r;
+                        }
+                        assert(key_pem);
+                        break;
+
+                case ARG_CERT:
+                        if (cert_pem) {
+                                log_error("Certificate file specified twice");
+                                return -EINVAL;
+                        }
+                        r = read_full_file(optarg, &cert_pem, NULL);
+                        if (r < 0) {
+                                log_error("Failed to read certificate file: %s", strerror(-r));
+                                return r;
+                        }
+                        assert(cert_pem);
+                        break;
+
+                case ARG_TRUST:
+#ifdef HAVE_GNUTLS
+                        if (trust_pem) {
+                                log_error("CA certificate file specified twice");
+                                return -EINVAL;
+                        }
+                        r = read_full_file(optarg, &trust_pem, NULL);
+                        if (r < 0) {
+                                log_error("Failed to read CA certificate file: %s", strerror(-r));
+                                return r;
+                        }
+                        assert(trust_pem);
+                        break;
+#else
+                        log_error("Option --trust is not available.");
+#endif
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached("Unhandled option");
+                }
+
+        if (optind < argc) {
+                log_error("This program does not take arguments.");
+                return -EINVAL;
+        }
+
+        if (!!key_pem != !!cert_pem) {
+                log_error("Certificate and key files must be specified together");
+                return -EINVAL;
+        }
+
+        if (trust_pem && !key_pem) {
+                log_error("CA certificate can only be used with certificate file");
+                return -EINVAL;
+        }
+
+        return 1;
+}
+
+int main(int argc, char *argv[]) {
+        struct MHD_Daemon *d = NULL;
+        int r, n;
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        r = parse_argv(argc, argv);
+        if (r < 0)
+                return EXIT_FAILURE;
+        if (r == 0)
+                return EXIT_SUCCESS;
+
+#ifdef HAVE_GNUTLS
+        gnutls_global_set_log_function(log_func_gnutls);
+        log_reset_gnutls_level();
+#endif
+
+        n = sd_listen_fds(1);
+        if (n < 0) {
+                log_error("Failed to determine passed sockets: %s", strerror(-n));
+                goto finish;
+        } else if (n > 1) {
+                log_error("Can't listen on more than one socket.");
+                goto finish;
+        } else {
+                struct MHD_OptionItem opts[] = {
+                        { MHD_OPTION_NOTIFY_COMPLETED,
+                          (intptr_t) request_meta_free, NULL },
+                        { MHD_OPTION_EXTERNAL_LOGGER,
+                          (intptr_t) microhttpd_logger, NULL },
+                        { MHD_OPTION_END, 0, NULL },
+                        { MHD_OPTION_END, 0, NULL },
+                        { MHD_OPTION_END, 0, NULL },
+                        { MHD_OPTION_END, 0, NULL },
+                        { MHD_OPTION_END, 0, NULL }};
+                int opts_pos = 2;
+                int flags = MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL|MHD_USE_DEBUG;
+
+                if (n > 0)
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_LISTEN_SOCKET, SD_LISTEN_FDS_START};
+                if (key_pem) {
+                        assert(cert_pem);
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_HTTPS_MEM_KEY, 0, key_pem};
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_HTTPS_MEM_CERT, 0, cert_pem};
+                        flags |= MHD_USE_SSL;
+                }
+                if (trust_pem) {
+                        assert(flags & MHD_USE_SSL);
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_HTTPS_MEM_TRUST, 0, trust_pem};
+                }
+
+                d = MHD_start_daemon(flags, 19531,
+                                     NULL, NULL,
+                                     request_handler, NULL,
+                                     MHD_OPTION_ARRAY, opts,
+                                     MHD_OPTION_END);
+        }
+
+        if (!d) {
+                log_error("Failed to start daemon!");
+                goto finish;
+        }
+
+        pause();
+
+        r = EXIT_SUCCESS;
+
+finish:
+        if (d)
+                MHD_stop_daemon(d);
+
+        return r;
+}