Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 569 insertions, 0 deletions

diff --git a/src/journal-remote/journal-remote.c b/src/journal-remote/journal-remote.c
new file mode 100644
index 0000000..79010d0
--- /dev/null
+++ b/src/journal-remote/journal-remote.c
@@ -0,0 +1,569 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+#include <stdint.h>
+
+#include "sd-daemon.h"
+
+#include "af-list.h"
+#include "alloc-util.h"
+#include "constants.h"
+#include "errno-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "journal-file-util.h"
+#include "journal-remote-write.h"
+#include "journal-remote.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "parse-helpers.h"
+#include "process-util.h"
+#include "socket-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+#define REMOTE_JOURNAL_PATH "/var/log/journal/remote"
+
+#define filename_escape(s) xescape((s), "/ ")
+
+#if HAVE_MICROHTTPD
+MHDDaemonWrapper *MHDDaemonWrapper_free(MHDDaemonWrapper *d) {
+        if (!d)
+                return NULL;
+
+        if (d->daemon)
+                MHD_stop_daemon(d->daemon);
+        sd_event_source_unref(d->io_event);
+        sd_event_source_unref(d->timer_event);
+
+        return mfree(d);
+}
+#endif
+
+static int open_output(RemoteServer *s, Writer *w, const char* host) {
+        _cleanup_free_ char *_filename = NULL;
+        const char *filename;
+        int r;
+
+        assert(s);
+        assert(w);
+
+        switch (s->split_mode) {
+        case JOURNAL_WRITE_SPLIT_NONE:
+                filename = s->output;
+                break;
+
+        case JOURNAL_WRITE_SPLIT_HOST: {
+                _cleanup_free_ char *name = NULL;
+
+                assert(host);
+
+                name = filename_escape(host);
+                if (!name)
+                        return log_oom();
+
+                r = asprintf(&_filename, "%s/remote-%s.journal", s->output, name);
+                if (r < 0)
+                        return log_oom();
+
+                filename = _filename;
+                break;
+        }
+
+        default:
+                assert_not_reached();
+        }
+
+        r = journal_file_open_reliably(
+                        filename,
+                        O_RDWR|O_CREAT,
+                        s->file_flags,
+                        0640,
+                        UINT64_MAX,
+                        &w->metrics,
+                        w->mmap,
+                        NULL,
+                        &w->journal);
+        if (r < 0)
+                return log_error_errno(r, "Failed to open output journal %s: %m", filename);
+
+        log_debug("Opened output file %s", w->journal->path);
+        return 0;
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+static int init_writer_hashmap(RemoteServer *s) {
+        static const struct hash_ops* const hash_ops[] = {
+                [JOURNAL_WRITE_SPLIT_NONE] = NULL,
+                [JOURNAL_WRITE_SPLIT_HOST] = &string_hash_ops,
+        };
+
+        assert(s);
+        assert(s->split_mode >= 0 && s->split_mode < (int) ELEMENTSOF(hash_ops));
+
+        s->writers = hashmap_new(hash_ops[s->split_mode]);
+        if (!s->writers)
+                return log_oom();
+
+        return 0;
+}
+
+int journal_remote_get_writer(RemoteServer *s, const char *host, Writer **writer) {
+        _cleanup_(writer_unrefp) Writer *w = NULL;
+        const void *key;
+        int r;
+
+        assert(s);
+        assert(writer);
+
+        switch (s->split_mode) {
+        case JOURNAL_WRITE_SPLIT_NONE:
+                key = "one and only";
+                break;
+
+        case JOURNAL_WRITE_SPLIT_HOST:
+                assert(host);
+                key = host;
+                break;
+
+        default:
+                assert_not_reached();
+        }
+
+        w = hashmap_get(s->writers, key);
+        if (w)
+                writer_ref(w);
+        else {
+                r = writer_new(s, &w);
+                if (r < 0)
+                        return r;
+
+                if (s->split_mode == JOURNAL_WRITE_SPLIT_HOST) {
+                        w->hashmap_key = strdup(key);
+                        if (!w->hashmap_key)
+                                return -ENOMEM;
+                }
+
+                r = open_output(s, w, host);
+                if (r < 0)
+                        return r;
+
+                r = hashmap_put(s->writers, w->hashmap_key ?: key, w);
+                if (r < 0)
+                        return r;
+        }
+
+        *writer = TAKE_PTR(w);
+        return 0;
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+/* This should go away as soon as μhttpd allows state to be passed around. */
+RemoteServer *journal_remote_server_global;
+
+static int dispatch_raw_source_event(sd_event_source *event,
+                                     int fd,
+                                     uint32_t revents,
+                                     void *userdata);
+static int dispatch_raw_source_until_block(sd_event_source *event,
+                                           void *userdata);
+static int dispatch_blocking_source_event(sd_event_source *event,
+                                          void *userdata);
+static int dispatch_raw_connection_event(sd_event_source *event,
+                                         int fd,
+                                         uint32_t revents,
+                                         void *userdata);
+
+static int get_source_for_fd(RemoteServer *s,
+                             int fd, char *name, RemoteSource **source) {
+        Writer *writer;
+        int r;
+
+        /* This takes ownership of name, but only on success. */
+
+        assert(s);
+        assert(fd >= 0);
+        assert(source);
+
+        if (!GREEDY_REALLOC0(s->sources, fd + 1))
+                return log_oom();
+
+        r = journal_remote_get_writer(s, name, &writer);
+        if (r < 0)
+                return log_warning_errno(r, "Failed to get writer for source %s: %m",
+                                         name);
+
+        if (!s->sources[fd]) {
+                s->sources[fd] = source_new(fd, false, name, writer);
+                if (!s->sources[fd]) {
+                        writer_unref(writer);
+                        return log_oom();
+                }
+
+                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) MALLOC_ELEMENTSOF(s->sources));
+
+        source = s->sources[fd];
+        if (source) {
+                /* this closes fd too */
+                source_free(source);
+                s->sources[fd] = NULL;
+                s->active--;
+        }
+
+        return 0;
+}
+
+int journal_remote_add_source(RemoteServer *s, int fd, char* name, bool own_name) {
+        RemoteSource *source = NULL;
+        int r;
+
+        /* This takes ownership of name, even on failure, if own_name is true. */
+
+        assert(s);
+        assert(fd >= 0);
+        assert(name);
+
+        if (!own_name) {
+                name = strdup(name);
+                if (!name)
+                        return log_oom();
+        }
+
+        r = get_source_for_fd(s, fd, name, &source);
+        if (r < 0) {
+                log_error_errno(r, "Failed to create source for fd:%d (%s): %m",
+                                fd, name);
+                free(name);
+                return r;
+        }
+
+        r = sd_event_add_io(s->events, &source->event,
+                            fd, EPOLLIN|EPOLLRDHUP|EPOLLPRI,
+                            dispatch_raw_source_event, source);
+        if (r == 0) {
+                /* Add additional source for buffer processing. It will be
+                 * enabled later. */
+                r = sd_event_add_defer(s->events, &source->buffer_event,
+                                       dispatch_raw_source_until_block, source);
+                if (r == 0)
+                        r = sd_event_source_set_enabled(source->buffer_event, SD_EVENT_OFF);
+        } else if (r == -EPERM) {
+                log_debug("Falling back to sd_event_add_defer for fd:%d (%s)", fd, name);
+                r = sd_event_add_defer(s->events, &source->event,
+                                       dispatch_blocking_source_event, source);
+                if (r == 0)
+                        r = sd_event_source_set_enabled(source->event, SD_EVENT_ON);
+        }
+        if (r < 0) {
+                log_error_errno(r, "Failed to register event source for fd:%d: %m",
+                                fd);
+                goto error;
+        }
+
+        r = sd_event_source_set_description(source->event, name);
+        if (r < 0) {
+                log_error_errno(r, "Failed to set source name for fd:%d: %m", fd);
+                goto error;
+        }
+
+        return 1; /* work to do */
+
+ error:
+        remove_source(s, fd);
+        return r;
+}
+
+int journal_remote_add_raw_socket(RemoteServer *s, int fd) {
+        _unused_ _cleanup_close_ int fd_ = fd;
+        char name[STRLEN("raw-socket-") + DECIMAL_STR_MAX(int) + 1];
+        int r;
+
+        assert(s);
+        assert(fd >= 0);
+
+        r = sd_event_add_io(s->events, &s->listen_event,
+                            fd, EPOLLIN,
+                            dispatch_raw_connection_event, s);
+        if (r < 0)
+                return r;
+
+        xsprintf(name, "raw-socket-%d", fd);
+
+        r = sd_event_source_set_description(s->listen_event, name);
+        if (r < 0)
+                return r;
+
+        TAKE_FD(fd_);
+        s->active++;
+        return 0;
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+int journal_remote_server_init(
+                RemoteServer *s,
+                const char *output,
+                JournalWriteSplitMode split_mode,
+                JournalFileFlags file_flags) {
+
+        int r;
+
+        assert(s);
+
+        assert(journal_remote_server_global == NULL);
+        journal_remote_server_global = s;
+
+        s->split_mode = split_mode;
+        s->file_flags = file_flags;
+
+        if (output)
+                s->output = output;
+        else if (split_mode == JOURNAL_WRITE_SPLIT_NONE)
+                s->output = REMOTE_JOURNAL_PATH "/remote.journal";
+        else if (split_mode == JOURNAL_WRITE_SPLIT_HOST)
+                s->output = REMOTE_JOURNAL_PATH;
+        else
+                assert_not_reached();
+
+        r = sd_event_default(&s->events);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate event loop: %m");
+
+        r = init_writer_hashmap(s);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+void journal_remote_server_destroy(RemoteServer *s) {
+        size_t i;
+
+        if (!s)
+                return;
+
+#if HAVE_MICROHTTPD
+        hashmap_free_with_destructor(s->daemons, MHDDaemonWrapper_free);
+#endif
+
+        for (i = 0; i < MALLOC_ELEMENTSOF(s->sources); i++)
+                remove_source(s, i);
+        free(s->sources);
+
+        writer_unref(s->_single_writer);
+        hashmap_free(s->writers);
+
+        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);
+
+        if (s == journal_remote_server_global)
+                journal_remote_server_global = NULL;
+
+        /* fds that we're listening on remain open... */
+}
+
+/**********************************************************************
+ **********************************************************************
+ **********************************************************************/
+
+int journal_remote_handle_raw_source(
+                sd_event_source *event,
+                int fd,
+                uint32_t revents,
+                RemoteServer *s) {
+
+        RemoteSource *source;
+        int r;
+
+        /* Returns 1 if there might be more data pending,
+         * 0 if data is currently exhausted, negative on error.
+         */
+
+        assert(s);
+        assert(fd >= 0 && fd < (ssize_t) MALLOC_ELEMENTSOF(s->sources));
+        source = s->sources[fd];
+        assert(source->importer.fd == fd);
+
+        r = process_source(source, s->file_flags);
+        if (journal_importer_eof(&source->importer)) {
+                size_t remaining;
+
+                log_debug("EOF reached with source %s (fd=%d)",
+                          source->importer.name, source->importer.fd);
+
+                remaining = journal_importer_bytes_remaining(&source->importer);
+                if (remaining > 0)
+                        log_notice("Premature EOF. %zu bytes lost.", remaining);
+                remove_source(s, source->importer.fd);
+                log_debug("%zu active sources remaining", s->active);
+                return 0;
+        } else if (r == -E2BIG) {
+                log_notice("Entry with too many fields, skipped");
+                return 1;
+        } else if (r == -ENOBUFS) {
+                log_notice("Entry too big, skipped");
+                return 1;
+        } else if (r == -EAGAIN) {
+                return 0;
+        } else if (r < 0) {
+                log_debug_errno(r, "Closing connection: %m");
+                remove_source(s, fd);
+                return 0;
+        } else
+                return 1;
+}
+
+static int dispatch_raw_source_until_block(sd_event_source *event,
+                                           void *userdata) {
+        RemoteSource *source = ASSERT_PTR(userdata);
+        int r;
+
+        assert(event);
+
+        /* Make sure event stays around even if source is destroyed */
+        sd_event_source_ref(event);
+
+        r = journal_remote_handle_raw_source(event, source->importer.fd, EPOLLIN, journal_remote_server_global);
+        if (r != 1) {
+                int k;
+
+                /* No more data for now */
+                k = sd_event_source_set_enabled(event, SD_EVENT_OFF);
+                if (k < 0)
+                        r = k;
+        }
+
+        sd_event_source_unref(event);
+
+        return r;
+}
+
+static int dispatch_raw_source_event(sd_event_source *event,
+                                     int fd,
+                                     uint32_t revents,
+                                     void *userdata) {
+        RemoteSource *source = ASSERT_PTR(userdata);
+        int r;
+
+        assert(source->event);
+        assert(source->buffer_event);
+
+        r = journal_remote_handle_raw_source(event, fd, EPOLLIN, journal_remote_server_global);
+        if (r == 1) {
+                int k;
+
+                /* Might have more data. We need to rerun the handler
+                 * until we are sure the buffer is exhausted. */
+                k = sd_event_source_set_enabled(source->buffer_event, SD_EVENT_ON);
+                if (k < 0)
+                        r = k;
+        }
+
+        return r;
+}
+
+static int dispatch_blocking_source_event(sd_event_source *event,
+                                          void *userdata) {
+        RemoteSource *source = ASSERT_PTR(userdata);
+
+        return journal_remote_handle_raw_source(event, source->importer.fd, EPOLLIN, journal_remote_server_global);
+}
+
+static int accept_connection(
+                const char* type,
+                int fd,
+                SocketAddress *addr,
+                char **hostname) {
+
+        _cleanup_close_ int fd2 = -EBADF;
+        int r;
+
+        assert(addr);
+        assert(hostname);
+
+        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) {
+                if (ERRNO_IS_ACCEPT_AGAIN(errno))
+                        return -EAGAIN;
+
+                return log_error_errno(errno, "accept() on fd:%d failed: %m", fd);
+        }
+
+        switch (socket_address_family(addr)) {
+        case AF_INET:
+        case AF_INET6: {
+                _cleanup_free_ char *a = NULL;
+                char *b;
+
+                r = socket_address_print(addr, &a);
+                if (r < 0)
+                        return log_error_errno(r, "socket_address_print(): %m");
+
+                r = socknameinfo_pretty(&addr->sockaddr, addr->size, &b);
+                if (r < 0)
+                        return log_error_errno(r, "Resolving hostname failed: %m");
+
+                log_debug("Accepted %s %s connection from %s",
+                          type,
+                          af_to_ipv4_ipv6(socket_address_family(addr)),
+                          a);
+
+                *hostname = b;
+                return TAKE_FD(fd2);
+        }
+
+        default:
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Rejected %s connection with unsupported family %d",
+                                       type, socket_address_family(addr));
+        }
+}
+
+static int dispatch_raw_connection_event(
+                sd_event_source *event,
+                int fd,
+                uint32_t revents,
+                void *userdata) {
+
+        RemoteServer *s = ASSERT_PTR(userdata);
+        int fd2;
+        SocketAddress addr = {
+                .size = sizeof(union sockaddr_union),
+                .type = SOCK_STREAM,
+        };
+        char *hostname = NULL;
+
+        fd2 = accept_connection("raw", fd, &addr, &hostname);
+        if (fd2 == -EAGAIN)
+                return 0;
+        if (fd2 < 0)
+                return fd2;
+
+        return journal_remote_add_source(s, fd2, hostname, true);
+}