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, 1283 insertions, 0 deletions

diff --git a/src/journal-remote/journal-remote.c b/src/journal-remote/journal-remote.c
new file mode 100644
index 0000000000..9db4692a28
--- /dev/null
+++ b/src/journal-remote/journal-remote.c
@@ -0,0 +1,1283 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2012 Zbigniew Jędrzejewski-Szmek
+
+  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 <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include "sd-daemon.h"
+#include "sd-event.h"
+#include "journal-file.h"
+#include "journald-native.h"
+#include "socket-util.h"
+#include "mkdir.h"
+#include "build.h"
+#include "macro.h"
+#include "strv.h"
+#include "fileio.h"
+#include "microhttpd-util.h"
+
+#ifdef HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#endif
+
+#include "journal-remote-parse.h"
+#include "journal-remote-write.h"
+
+#define REMOTE_JOURNAL_PATH "/var/log/journal/" SD_ID128_FORMAT_STR "/remote-%s.journal"
+
+static char* arg_output = NULL;
+static char* arg_url = NULL;
+static char* arg_getter = NULL;
+static char* arg_listen_raw = NULL;
+static char* arg_listen_http = NULL;
+static char* arg_listen_https = NULL;
+static char** arg_files = NULL;
+static int arg_compress = true;
+static int arg_seal = false;
+static int http_socket = -1, https_socket = -1;
+static char** arg_gnutls_log = NULL;
+
+static char *key_pem = NULL;
+static char *cert_pem = NULL;
+static char *trust_pem = NULL;
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static int spawn_child(const char* child, char** argv) {
+        int fd[2];
+        pid_t parent_pid, child_pid;
+        int r;
+
+        if (pipe(fd) < 0) {
+                log_error("Failed to create pager pipe: %m");
+                return -errno;
+        }
+
+        parent_pid = getpid();
+
+        child_pid = fork();
+        if (child_pid < 0) {
+                r = -errno;
+                log_error("Failed to fork: %m");
+                safe_close_pair(fd);
+                return r;
+        }
+
+        /* In the child */
+        if (child_pid == 0) {
+                r = dup2(fd[1], STDOUT_FILENO);
+                if (r < 0) {
+                        log_error("Failed to dup pipe to stdout: %m");
+                        _exit(EXIT_FAILURE);
+                }
+
+                safe_close_pair(fd);
+
+                /* Make sure the child goes away when the parent dies */
+                if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
+                        _exit(EXIT_FAILURE);
+
+                /* Check whether our parent died before we were able
+                 * to set the death signal */
+                if (getppid() != parent_pid)
+                        _exit(EXIT_SUCCESS);
+
+                execvp(child, argv);
+                log_error("Failed to exec child %s: %m", child);
+                _exit(EXIT_FAILURE);
+        }
+
+        r = close(fd[1]);
+        if (r < 0)
+                log_warning("Failed to close write end of pipe: %m");
+
+        return fd[0];
+}
+
+static int spawn_curl(char* url) {
+        char **argv = STRV_MAKE("curl",
+                                "-HAccept: application/vnd.fdo.journal",
+                                "--silent",
+                                "--show-error",
+                                url);
+        int r;
+
+        r = spawn_child("curl", argv);
+        if (r < 0)
+                log_error("Failed to spawn curl: %m");
+        return r;
+}
+
+static int spawn_getter(char *getter, char *url) {
+        int r;
+        _cleanup_strv_free_ char **words = NULL;
+
+        assert(getter);
+        words = strv_split_quoted(getter);
+        if (!words)
+                return log_oom();
+
+        r = spawn_child(words[0], words);
+        if (r < 0)
+                log_error("Failed to spawn getter %s: %m", getter);
+
+        return r;
+}
+
+static int open_output(Writer *s, const char* url) {
+        _cleanup_free_ char *name, *output = NULL;
+        char *c;
+        int r;
+
+        assert(url);
+        name = strdup(url);
+        if (!name)
+                return log_oom();
+
+        for(c = name; *c; c++) {
+                if (*c == '/' || *c == ':' || *c == ' ')
+                        *c = '~';
+                else if (*c == '?') {
+                        *c = '\0';
+                        break;
+                }
+        }
+
+        if (!arg_output) {
+                sd_id128_t machine;
+                r = sd_id128_get_machine(&machine);
+                if (r < 0) {
+                        log_error("failed to determine machine ID128: %s", strerror(-r));
+                        return r;
+                }
+
+                r = asprintf(&output, REMOTE_JOURNAL_PATH,
+                             SD_ID128_FORMAT_VAL(machine), name);
+                if (r < 0)
+                        return log_oom();
+        } else {
+                r = is_dir(arg_output, true);
+                if (r > 0) {
+                        r = asprintf(&output,
+                                     "%s/remote-%s.journal", arg_output, name);
+                        if (r < 0)
+                                return log_oom();
+                } else {
+                        output = strdup(arg_output);
+                        if (!output)
+                                return log_oom();
+                }
+        }
+
+        r = journal_file_open_reliably(output,
+                                       O_RDWR|O_CREAT, 0640,
+                                       arg_compress, arg_seal,
+                                       &s->metrics,
+                                       s->mmap,
+                                       NULL, &s->journal);
+        if (r < 0)
+                log_error("Failed to open output journal %s: %s",
+                          arg_output, strerror(-r));
+        else
+                log_info("Opened output file %s", s->journal->path);
+        return r;
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+typedef struct MHDDaemonWrapper {
+        uint64_t fd;
+        struct MHD_Daemon *daemon;
+
+        sd_event_source *event;
+} MHDDaemonWrapper;
+
+typedef struct RemoteServer {
+        RemoteSource **sources;
+        size_t sources_size;
+        size_t active;
+
+        sd_event *events;
+        sd_event_source *sigterm_event, *sigint_event, *listen_event;
+
+        Writer writer;
+
+        Hashmap *daemons;
+} RemoteServer;
+
+/* This should go away as soon as µhttpd allows state to be passed around. */
+static RemoteServer *server;
+
+static int dispatch_raw_source_event(sd_event_source *event,
+                                     int fd,
+                                     uint32_t revents,
+                                     void *userdata);
+static int dispatch_raw_connection_event(sd_event_source *event,
+                                         int fd,
+                                         uint32_t revents,
+                                         void *userdata);
+static int dispatch_http_event(sd_event_source *event,
+                               int fd,
+                               uint32_t revents,
+                               void *userdata);
+
+static int get_source_for_fd(RemoteServer *s, int fd, RemoteSource **source) {
+        assert(fd >= 0);
+        assert(source);
+
+        if (!GREEDY_REALLOC0(s->sources, s->sources_size, fd + 1))
+                return log_oom();
+
+        if (s->sources[fd] == NULL) {
+                s->sources[fd] = new0(RemoteSource, 1);
+                if (!s->sources[fd])
+                        return log_oom();
+                s->sources[fd]->fd = -1;
+                s->active++;
+        }
+
+        *source = s->sources[fd];
+        return 0;
+}
+
+static int remove_source(RemoteServer *s, int fd) {
+        RemoteSource *source;
+
+        assert(s);
+        assert(fd >= 0 && fd < (ssize_t) s->sources_size);
+
+        source = s->sources[fd];
+        if (source) {
+                source_free(source);
+                s->sources[fd] = NULL;
+                s->active--;
+        }
+
+        close(fd);
+
+        return 0;
+}
+
+static int add_source(RemoteServer *s, int fd, const char* name) {
+        RemoteSource *source = NULL;
+        _cleanup_free_ char *realname = NULL;
+        int r;
+
+        assert(s);
+        assert(fd >= 0);
+
+        if (name) {
+                realname = strdup(name);
+                if (!realname)
+                        return log_oom();
+        } else {
+                r = asprintf(&realname, "fd:%d", fd);
+                if (r < 0)
+                        return log_oom();
+        }
+
+        log_debug("Creating source for fd:%d (%s)", fd, realname);
+
+        r = get_source_for_fd(s, fd, &source);
+        if (r < 0) {
+                log_error("Failed to create source for fd:%d (%s)", fd, realname);
+                return r;
+        }
+        assert(source);
+        assert(source->fd < 0);
+        source->fd = fd;
+
+        r = sd_event_add_io(s->events, &source->event,
+                            fd, EPOLLIN, dispatch_raw_source_event, s);
+        if (r < 0) {
+                log_error("Failed to register event source for fd:%d: %s",
+                          fd, strerror(-r));
+                goto error;
+        }
+
+        return 1; /* work to do */
+
+ error:
+        remove_source(s, fd);
+        return r;
+}
+
+static int add_raw_socket(RemoteServer *s, int fd) {
+        int r;
+
+        r = sd_event_add_io(s->events, &s->listen_event, fd, EPOLLIN,
+                            dispatch_raw_connection_event, s);
+        if (r < 0) {
+                close(fd);
+                return r;
+        }
+
+        s->active ++;
+        return 0;
+}
+
+static int setup_raw_socket(RemoteServer *s, const char *address) {
+        int fd;
+
+        fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
+        if (fd < 0)
+                return fd;
+
+        return add_raw_socket(s, fd);
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static RemoteSource *request_meta(void **connection_cls) {
+        RemoteSource *source;
+
+        assert(connection_cls);
+        if (*connection_cls)
+                return *connection_cls;
+
+        source = new0(RemoteSource, 1);
+        if (!source)
+                return NULL;
+        source->fd = -1;
+
+        log_debug("Added RemoteSource as connection metadata %p", source);
+
+        *connection_cls = source;
+        return source;
+}
+
+static void request_meta_free(void *cls,
+                              struct MHD_Connection *connection,
+                              void **connection_cls,
+                              enum MHD_RequestTerminationCode toe) {
+        RemoteSource *s;
+
+        assert(connection_cls);
+        s = *connection_cls;
+
+        log_debug("Cleaning up connection metadata %p", s);
+        source_free(s);
+        *connection_cls = NULL;
+}
+
+static int process_http_upload(
+                struct MHD_Connection *connection,
+                const char *upload_data,
+                size_t *upload_data_size,
+                RemoteSource *source) {
+
+        bool finished = false;
+        int r;
+
+        assert(source);
+
+        log_debug("request_handler_upload: connection %p, %zu bytes",
+                  connection, *upload_data_size);
+
+        if (*upload_data_size) {
+                log_info("Received %zu bytes", *upload_data_size);
+
+                r = push_data(source, upload_data, *upload_data_size);
+                if (r < 0) {
+                        log_error("Failed to store received data of size %zu: %s",
+                                  *upload_data_size, strerror(-r));
+                        return mhd_respond_oom(connection);
+                }
+                *upload_data_size = 0;
+        } else
+                finished = true;
+
+        while (true) {
+                r = process_source(source, &server->writer, arg_compress, arg_seal);
+                if (r == -E2BIG)
+                        log_warning("Entry too big, skipped");
+                else if (r == -EAGAIN || r == -EWOULDBLOCK)
+                        break;
+                else if (r < 0) {
+                        log_warning("Failed to process data for connection %p", connection);
+                        return mhd_respondf(connection, MHD_HTTP_UNPROCESSABLE_ENTITY,
+                                            "Processing failed: %s", strerror(-r));
+                }
+        }
+
+        if (!finished)
+                return MHD_YES;
+
+        /* The upload is finished */
+
+        if (source_non_empty(source)) {
+                log_warning("EOF reached with incomplete data");
+                return mhd_respond(connection, MHD_HTTP_EXPECTATION_FAILED,
+                                   "Trailing data not processed.");
+        }
+
+        return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.\n");
+};
+
+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) {
+
+        const char *header;
+        int r ,code;
+
+        assert(connection);
+        assert(connection_cls);
+        assert(url);
+        assert(method);
+
+        log_debug("Handling a connection %s %s %s", method, url, version);
+
+        if (*connection_cls)
+                return process_http_upload(connection,
+                                           upload_data, upload_data_size,
+                                           *connection_cls);
+
+        if (!streq(method, "POST"))
+                return mhd_respond(connection, MHD_HTTP_METHOD_NOT_ACCEPTABLE,
+                                   "Unsupported method.\n");
+
+        if (!streq(url, "/upload"))
+                return mhd_respond(connection, MHD_HTTP_NOT_FOUND,
+                                   "Not found.\n");
+
+        header = MHD_lookup_connection_value(connection,
+                                             MHD_HEADER_KIND, "Content-Type");
+        if (!header || !streq(header, "application/vnd.fdo.journal"))
+                return mhd_respond(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
+                                   "Content-Type: application/vnd.fdo.journal"
+                                   " is required.\n");
+
+        if (trust_pem) {
+                r = check_permissions(connection, &code);
+                if (r < 0)
+                        return code;
+        }
+
+        if (!request_meta(connection_cls))
+                return respond_oom(connection);
+        return MHD_YES;
+}
+
+static int setup_microhttpd_server(RemoteServer *s, int fd, bool https) {
+        struct MHD_OptionItem opts[] = {
+                { MHD_OPTION_NOTIFY_COMPLETED, (intptr_t) request_meta_free},
+                { MHD_OPTION_EXTERNAL_LOGGER, (intptr_t) microhttpd_logger},
+                { MHD_OPTION_LISTEN_SOCKET, fd},
+                { MHD_OPTION_END},
+                { MHD_OPTION_END},
+                { MHD_OPTION_END},
+                { MHD_OPTION_END}};
+        int opts_pos = 3;
+        int flags =
+                MHD_USE_DEBUG |
+                MHD_USE_PEDANTIC_CHECKS |
+                MHD_USE_EPOLL_LINUX_ONLY |
+                MHD_USE_DUAL_STACK;
+
+        const union MHD_DaemonInfo *info;
+        int r, epoll_fd;
+        MHDDaemonWrapper *d;
+
+        assert(fd >= 0);
+
+        r = fd_nonblock(fd, true);
+        if (r < 0) {
+                log_error("Failed to make fd:%d nonblocking: %s", fd, strerror(-r));
+                return r;
+        }
+
+        if (https) {
+                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)
+                        opts[opts_pos++] = (struct MHD_OptionItem)
+                                {MHD_OPTION_HTTPS_MEM_TRUST, 0, trust_pem};
+        }
+
+        d = new(MHDDaemonWrapper, 1);
+        if (!d)
+                return log_oom();
+
+        d->fd = (uint64_t) fd;
+
+        d->daemon = MHD_start_daemon(flags, 0,
+                                     NULL, NULL,
+                                     request_handler, NULL,
+                                     MHD_OPTION_ARRAY, opts,
+                                     MHD_OPTION_END);
+        if (!d->daemon) {
+                log_error("Failed to start µhttp daemon");
+                r = -EINVAL;
+                goto error;
+        }
+
+        log_debug("Started MHD %s daemon on fd:%d (wrapper @ %p)",
+                  https ? "HTTPS" : "HTTP", fd, d);
+
+
+        info = MHD_get_daemon_info(d->daemon, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
+        if (!info) {
+                log_error("µhttp returned NULL daemon info");
+                r = -ENOTSUP;
+                goto error;
+        }
+
+        epoll_fd = info->listen_fd;
+        if (epoll_fd < 0) {
+                log_error("µhttp epoll fd is invalid");
+                r = -EUCLEAN;
+                goto error;
+        }
+
+        r = sd_event_add_io(s->events, &d->event,
+                            epoll_fd, EPOLLIN, dispatch_http_event, d);
+        if (r < 0) {
+                log_error("Failed to add event callback: %s", strerror(-r));
+                goto error;
+        }
+
+        r = hashmap_ensure_allocated(&s->daemons, uint64_hash_func, uint64_compare_func);
+        if (r < 0) {
+                log_oom();
+                goto error;
+        }
+
+        r = hashmap_put(s->daemons, &d->fd, d);
+        if (r < 0) {
+                log_error("Failed to add daemon to hashmap: %s", strerror(-r));
+                goto error;
+        }
+
+        s->active ++;
+        return 0;
+
+error:
+        MHD_stop_daemon(d->daemon);
+        free(d->daemon);
+        free(d);
+        return r;
+}
+
+static int setup_microhttpd_socket(RemoteServer *s,
+                                   const char *address,
+                                   bool https) {
+        int fd;
+
+        fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
+        if (fd < 0)
+                return fd;
+
+        return setup_microhttpd_server(s, fd, https);
+}
+
+static int dispatch_http_event(sd_event_source *event,
+                               int fd,
+                               uint32_t revents,
+                               void *userdata) {
+        MHDDaemonWrapper *d = userdata;
+        int r;
+
+        assert(d);
+
+        log_info("%s", __func__);
+
+        r = MHD_run(d->daemon);
+        if (r == MHD_NO) {
+                log_error("MHD_run failed!");
+                // XXX: unregister daemon
+                return -EINVAL;
+        }
+
+        return 1; /* work to do */
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static int dispatch_sigterm(sd_event_source *event,
+                            const struct signalfd_siginfo *si,
+                            void *userdata) {
+        RemoteServer *s = userdata;
+
+        assert(s);
+
+        log_received_signal(LOG_INFO, si);
+
+        sd_event_exit(s->events, 0);
+        return 0;
+}
+
+static int setup_signals(RemoteServer *s) {
+        sigset_t mask;
+        int r;
+
+        assert(s);
+
+        assert_se(sigemptyset(&mask) == 0);
+        sigset_add_many(&mask, SIGINT, SIGTERM, -1);
+        assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+        r = sd_event_add_signal(s->events, &s->sigterm_event, SIGTERM, dispatch_sigterm, s);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(s->events, &s->sigint_event, SIGINT, dispatch_sigterm, s);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int fd_fd(const char *spec) {
+        int fd, r;
+
+        r = safe_atoi(spec, &fd);
+        if (r < 0)
+                return r;
+
+        if (fd >= 0)
+                return -ENOENT;
+
+        return -fd;
+}
+
+
+static int remoteserver_init(RemoteServer *s) {
+        int r, n, fd;
+        const char *output_name = NULL;
+        char **file;
+
+        assert(s);
+
+        sd_event_default(&s->events);
+
+        setup_signals(s);
+
+        assert(server == NULL);
+        server = s;
+
+        n = sd_listen_fds(true);
+        if (n < 0) {
+                log_error("Failed to read listening file descriptors from environment: %s",
+                          strerror(-n));
+                return n;
+        } else
+                log_info("Received %d descriptors", n);
+
+        if (MAX(http_socket, https_socket) >= SD_LISTEN_FDS_START + n) {
+                log_error("Received fewer sockets than expected");
+                return -EBADFD;
+        }
+
+        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
+                if (sd_is_socket(fd, AF_UNSPEC, 0, false)) {
+                        log_info("Received a listening socket (fd:%d)", fd);
+
+                        if (fd == http_socket)
+                                r = setup_microhttpd_server(s, fd, false);
+                        else if (fd == https_socket)
+                                r = setup_microhttpd_server(s, fd, true);
+                        else
+                                r = add_raw_socket(s, fd);
+                } else if (sd_is_socket(fd, AF_UNSPEC, 0, true)) {
+                        log_info("Received a connection socket (fd:%d)", fd);
+
+                        r = add_source(s, fd, NULL);
+                } else {
+                        log_error("Unknown socket passed on fd:%d", fd);
+
+                        return -EINVAL;
+                }
+
+                if(r < 0) {
+                        log_error("Failed to register socket (fd:%d): %s",
+                                  fd, strerror(-r));
+                        return r;
+                }
+
+                output_name = "socket";
+        }
+
+        if (arg_url) {
+                _cleanup_free_ char *url = NULL;
+                _cleanup_strv_free_ char **urlv = strv_new(arg_url, "/entries", NULL);
+                if (!urlv)
+                        return log_oom();
+                url = strv_join(urlv, "");
+                if (!url)
+                        return log_oom();
+
+                if (arg_getter) {
+                        log_info("Spawning getter %s...", url);
+                        fd = spawn_getter(arg_getter, url);
+                } else {
+                        log_info("Spawning curl %s...", url);
+                        fd = spawn_curl(url);
+                }
+                if (fd < 0)
+                        return fd;
+
+                r = add_source(s, fd, arg_url);
+                if (r < 0)
+                        return r;
+
+                output_name = arg_url;
+        }
+
+        if (arg_listen_raw) {
+                log_info("Listening on a socket...");
+                r = setup_raw_socket(s, arg_listen_raw);
+                if (r < 0)
+                        return r;
+
+                output_name = arg_listen_raw;
+        }
+
+        if (arg_listen_http) {
+                r = setup_microhttpd_socket(s, arg_listen_http, false);
+                if (r < 0)
+                        return r;
+
+                output_name = arg_listen_http;
+        }
+
+        if (arg_listen_https) {
+                r = setup_microhttpd_socket(s, arg_listen_https, true);
+                if (r < 0)
+                        return r;
+
+                output_name = arg_listen_https;
+        }
+
+        STRV_FOREACH(file, arg_files) {
+                if (streq(*file, "-")) {
+                        log_info("Reading standard input...");
+
+                        fd = STDIN_FILENO;
+                        output_name = "stdin";
+                } else {
+                        log_info("Reading file %s...", *file);
+
+                        fd = open(*file, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+                        if (fd < 0) {
+                                log_error("Failed to open %s: %m", *file);
+                                return -errno;
+                        }
+                        output_name = *file;
+                }
+
+                r = add_source(s, fd, output_name);
+                if (r < 0)
+                        return r;
+        }
+
+        if (s->active == 0) {
+                log_error("Zarro sources specified");
+                return -EINVAL;
+        }
+
+        if (!!n + !!arg_url + !!arg_listen_raw + !!arg_files)
+                output_name = "multiple";
+
+        r = writer_init(&s->writer);
+        if (r < 0)
+                return r;
+
+        r = open_output(&s->writer, output_name);
+        return r;
+}
+
+static int server_destroy(RemoteServer *s) {
+        int r;
+        size_t i;
+        MHDDaemonWrapper *d;
+
+        r = writer_close(&s->writer);
+
+        while ((d = hashmap_steal_first(s->daemons))) {
+                MHD_stop_daemon(d->daemon);
+                sd_event_source_unref(d->event);
+                free(d);
+        }
+
+        hashmap_free(s->daemons);
+
+        assert(s->sources_size == 0 || s->sources);
+        for (i = 0; i < s->sources_size; i++)
+                remove_source(s, i);
+
+        free(s->sources);
+
+        sd_event_source_unref(s->sigterm_event);
+        sd_event_source_unref(s->sigint_event);
+        sd_event_source_unref(s->listen_event);
+        sd_event_unref(s->events);
+
+        /* fds that we're listening on remain open... */
+
+        return r;
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static int dispatch_raw_source_event(sd_event_source *event,
+                                     int fd,
+                                     uint32_t revents,
+                                     void *userdata) {
+
+        RemoteServer *s = userdata;
+        RemoteSource *source;
+        int r;
+
+        assert(fd >= 0 && fd < (ssize_t) s->sources_size);
+        source = s->sources[fd];
+        assert(source->fd == fd);
+
+        r = process_source(source, &s->writer, arg_compress, arg_seal);
+        if (source->state == STATE_EOF) {
+                log_info("EOF reached with source fd:%d (%s)",
+                         source->fd, source->name);
+                if (source_non_empty(source))
+                        log_warning("EOF reached with incomplete data");
+                remove_source(s, source->fd);
+                log_info("%zd active source remaining", s->active);
+        } else if (r == -E2BIG) {
+                log_error("Entry too big, skipped");
+                r = 1;
+        }
+
+        return r;
+}
+
+static int accept_connection(const char* type, int fd, SocketAddress *addr) {
+        int fd2, r;
+
+        log_debug("Accepting new %s connection on fd:%d", type, fd);
+        fd2 = accept4(fd, &addr->sockaddr.sa, &addr->size, SOCK_NONBLOCK|SOCK_CLOEXEC);
+        if (fd2 < 0) {
+                log_error("accept() on fd:%d failed: %m", fd);
+                return -errno;
+        }
+
+        switch(socket_address_family(addr)) {
+        case AF_INET:
+        case AF_INET6: {
+                char* _cleanup_free_ a = NULL;
+
+                r = socket_address_print(addr, &a);
+                if (r < 0) {
+                        log_error("socket_address_print(): %s", strerror(-r));
+                        close(fd2);
+                        return r;
+                }
+
+                log_info("Accepted %s %s connection from %s",
+                         type,
+                         socket_address_family(addr) == AF_INET ? "IP" : "IPv6",
+                         a);
+
+                return fd2;
+        };
+        default:
+                log_error("Rejected %s connection with unsupported family %d",
+                          type, socket_address_family(addr));
+                close(fd2);
+
+                return -EINVAL;
+        }
+}
+
+static int dispatch_raw_connection_event(sd_event_source *event,
+                                         int fd,
+                                         uint32_t revents,
+                                         void *userdata) {
+        RemoteServer *s = userdata;
+        int fd2;
+        SocketAddress addr = {
+                .size = sizeof(union sockaddr_union),
+                .type = SOCK_STREAM,
+        };
+
+        fd2 = accept_connection("raw", fd, &addr);
+        if (fd2 < 0)
+                return fd2;
+
+        return add_source(s, fd2, NULL);
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static int help(void) {
+        printf("%s [OPTIONS...] {FILE|-}...\n\n"
+               "Write external journal events to a journal file.\n\n"
+               "Options:\n"
+               "  --url=URL            Read events from systemd-journal-gatewayd at URL\n"
+               "  --getter=COMMAND     Read events from the output of COMMAND\n"
+               "  --listen-raw=ADDR    Listen for connections at ADDR\n"
+               "  --listen-http=ADDR   Listen for HTTP connections at ADDR\n"
+               "  --listen-https=ADDR  Listen for HTTPS connections at ADDR\n"
+               "  -o --output=FILE|DIR Write output to FILE or DIR/external-*.journal\n"
+               "  --[no-]compress      Use XZ-compression in the output journal (default: yes)\n"
+               "  --[no-]seal          Use Event sealing in the output journal (default: no)\n"
+               "  --key=FILENAME       Specify key in PEM format\n"
+               "  --cert=FILENAME      Specify certificate in PEM format\n"
+               "  --trust=FILENAME     Specify CA certificate in PEM format\n"
+               "  --gnutls-log=CATEGORY...\n"
+               "                       Specify a list of gnutls logging categories\n"
+               "  -h --help            Show this help and exit\n"
+               "  --version            Print version string and exit\n"
+               "\n"
+               "Note: file descriptors from sd_listen_fds() will be consumed, too.\n"
+               , program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_URL,
+                ARG_LISTEN_RAW,
+                ARG_LISTEN_HTTP,
+                ARG_LISTEN_HTTPS,
+                ARG_GETTER,
+                ARG_COMPRESS,
+                ARG_NO_COMPRESS,
+                ARG_SEAL,
+                ARG_NO_SEAL,
+                ARG_KEY,
+                ARG_CERT,
+                ARG_TRUST,
+                ARG_GNUTLS_LOG,
+        };
+
+        static const struct option options[] = {
+                { "help",         no_argument,       NULL, 'h'              },
+                { "version",      no_argument,       NULL, ARG_VERSION      },
+                { "url",          required_argument, NULL, ARG_URL          },
+                { "getter",       required_argument, NULL, ARG_GETTER       },
+                { "listen-raw",   required_argument, NULL, ARG_LISTEN_RAW   },
+                { "listen-http",  required_argument, NULL, ARG_LISTEN_HTTP  },
+                { "listen-https", required_argument, NULL, ARG_LISTEN_HTTPS },
+                { "output",       required_argument, NULL, 'o'              },
+                { "compress",     no_argument,       NULL, ARG_COMPRESS     },
+                { "no-compress",  no_argument,       NULL, ARG_NO_COMPRESS  },
+                { "seal",         no_argument,       NULL, ARG_SEAL         },
+                { "no-seal",      no_argument,       NULL, ARG_NO_SEAL      },
+                { "key",          required_argument, NULL, ARG_KEY          },
+                { "cert",         required_argument, NULL, ARG_CERT         },
+                { "trust",        required_argument, NULL, ARG_TRUST        },
+                { "gnutls-log",   required_argument, NULL, ARG_GNUTLS_LOG   },
+                {}
+        };
+
+        int c, r;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "ho:", options, NULL)) >= 0)
+                switch(c) {
+                case 'h':
+                        help();
+                        return 0 /* done */;
+
+                case ARG_VERSION:
+                        puts(PACKAGE_STRING);
+                        puts(SYSTEMD_FEATURES);
+                        return 0 /* done */;
+
+                case ARG_URL:
+                        if (arg_url) {
+                                log_error("cannot currently set more than one --url");
+                                return -EINVAL;
+                        }
+
+                        arg_url = optarg;
+                        break;
+
+                case ARG_GETTER:
+                        if (arg_getter) {
+                                log_error("cannot currently use --getter more than once");
+                                return -EINVAL;
+                        }
+
+                        arg_getter = optarg;
+                        break;
+
+                case ARG_LISTEN_RAW:
+                        if (arg_listen_raw) {
+                                log_error("cannot currently use --listen-raw more than once");
+                                return -EINVAL;
+                        }
+
+                        arg_listen_raw = optarg;
+                        break;
+
+                case ARG_LISTEN_HTTP:
+                        if (arg_listen_http || http_socket >= 0) {
+                                log_error("cannot currently use --listen-http more than once");
+                                return -EINVAL;
+                        }
+
+                        r = fd_fd(optarg);
+                        if (r >= 0)
+                                http_socket = r;
+                        else if (r == -ENOENT)
+                                arg_listen_http = optarg;
+                        else {
+                                log_error("Invalid port/fd specification %s: %s",
+                                          optarg, strerror(-r));
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case ARG_LISTEN_HTTPS:
+                        if (arg_listen_https || https_socket >= 0) {
+                                log_error("cannot currently use --listen-https more than once");
+                                return -EINVAL;
+                        }
+
+                        r = fd_fd(optarg);
+                        if (r >= 0)
+                                https_socket = r;
+                        else if (r == -ENOENT)
+                                arg_listen_https = optarg;
+                        else {
+                                log_error("Invalid port/fd specification %s: %s",
+                                          optarg, strerror(-r));
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                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.");
+                        return -EINVAL;
+#endif
+
+                case 'o':
+                        if (arg_output) {
+                                log_error("cannot use --output/-o more than once");
+                                return -EINVAL;
+                        }
+
+                        arg_output = optarg;
+                        break;
+
+                case ARG_COMPRESS:
+                        arg_compress = true;
+                        break;
+                case ARG_NO_COMPRESS:
+                        arg_compress = false;
+                        break;
+                case ARG_SEAL:
+                        arg_seal = true;
+                        break;
+                case ARG_NO_SEAL:
+                        arg_seal = false;
+                        break;
+
+                case ARG_GNUTLS_LOG: {
+#ifdef HAVE_GNUTLS
+                        char *word, *state;
+                        size_t size;
+
+                        FOREACH_WORD_SEPARATOR(word, size, optarg, ",", state) {
+                                char *cat;
+
+                                cat = strndup(word, size);
+                                if (!cat)
+                                        return log_oom();
+
+                                if (strv_consume(&arg_gnutls_log, cat) < 0)
+                                        return log_oom();
+                        }
+                        break;
+#else
+                        log_error("Option --gnutls-log is not available.");
+                        return -EINVAL;
+#endif
+                }
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        log_error("Unknown option code %c", c);
+                        return -EINVAL;
+                }
+
+        if (arg_listen_https && !(key_pem && cert_pem)) {
+                log_error("Options --key and --cert must be used when https sources are specified");
+                return -EINVAL;
+        }
+
+        if (optind < argc)
+                arg_files = argv + optind;
+
+        return 1 /* work to do */;
+}
+
+static int setup_gnutls_logger(char **categories) {
+        if (!arg_listen_http && !arg_listen_https)
+                return 0;
+
+#ifdef HAVE_GNUTLS
+        {
+                char **cat;
+                int r;
+
+                gnutls_global_set_log_function(log_func_gnutls);
+
+                if (categories)
+                        STRV_FOREACH(cat, categories) {
+                                r = log_enable_gnutls_category(*cat);
+                                if (r < 0)
+                                        return r;
+                        }
+                else
+                        log_reset_gnutls_level();
+        }
+#endif
+
+        return 0;
+}
+
+int main(int argc, char **argv) {
+        RemoteServer s = {};
+        int r, r2;
+
+        log_set_max_level(LOG_DEBUG);
+        log_show_color(true);
+        log_parse_environment();
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+
+        r = setup_gnutls_logger(arg_gnutls_log);
+        if (r < 0)
+                return EXIT_FAILURE;
+
+        if (remoteserver_init(&s) < 0)
+                return EXIT_FAILURE;
+
+        log_debug("%s running as pid "PID_FMT,
+                  program_invocation_short_name, getpid());
+        sd_notify(false,
+                  "READY=1\n"
+                  "STATUS=Processing requests...");
+
+        while (s.active) {
+                r = sd_event_get_state(s.events);
+                if (r < 0)
+                        break;
+                if (r == SD_EVENT_FINISHED)
+                        break;
+
+                r = sd_event_run(s.events, -1);
+                if (r < 0) {
+                        log_error("Failed to run event loop: %s", strerror(-r));
+                        break;
+                }
+        }
+
+        log_info("Finishing after writing %" PRIu64 " entries", s.writer.seqnum);
+        r2 = server_destroy(&s);
+
+        sd_notify(false, "STATUS=Shutting down...");
+
+        return r >= 0 && r2 >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}