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From e0a3cd2cb02c465c13dcc4e2c092c9e14883ad59 Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Wed, 3 Feb 2016 10:37:48 +0100
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Subject: [PATCH] Revert "Revert "journald: allow restarting journald without
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 losing stream connections""
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This reverts commit 91cb89c1b79ef3c475d91319edb0c052cb9f2724.
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Resolves: #1359939
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---
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 src/journal/journald-server.c |  26 ++-
23b3cf
 src/journal/journald-stream.c | 371 +++++++++++++++++++++++++++++-----
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 src/journal/journald-stream.h |   3 +-
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 3 files changed, 340 insertions(+), 60 deletions(-)
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diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
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index 07426b41e8..c1358e1e95 100644
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--- a/src/journal/journald-server.c
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+++ b/src/journal/journald-server.c
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@@ -1477,6 +1477,7 @@ static int server_open_hostname(Server *s) {
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 }
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 int server_init(Server *s) {
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+        _cleanup_fdset_free_ FDSet *fds = NULL;
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         int n, r, fd;
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         assert(s);
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@@ -1573,26 +1574,33 @@ int server_init(Server *s) {
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                         s->audit_fd = fd;
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                 } else {
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-                        log_warning("Unknown socket passed as file descriptor %d, ignoring.", fd);
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-                        /* Let's close the fd, better be safe than
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-                           sorry. The fd might reference some resource
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-                           that we really want to release if we don't
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-                           make use of it. */
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+                        if (!fds) {
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+                                fds = fdset_new();
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+                                if (!fds)
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+                                        return log_oom();
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+                        }
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-                        safe_close(fd);
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+                        r = fdset_put(fds, fd);
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+                        if (r < 0)
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+                                return log_oom();
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                 }
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         }
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-        r = server_open_syslog_socket(s);
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+        r = server_open_stdout_socket(s, fds);
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         if (r < 0)
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                 return r;
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-        r = server_open_native_socket(s);
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+        if (fdset_size(fds) > 0) {
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+                log_warning("%u unknown file descriptors passed, closing.", fdset_size(fds));
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+                fds = fdset_free(fds);
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+        }
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+
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+        r = server_open_syslog_socket(s);
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         if (r < 0)
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                 return r;
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-        r = server_open_stdout_socket(s);
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+        r = server_open_native_socket(s);
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         if (r < 0)
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                 return r;
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diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
c62b8e
index b8607144b3..15c9110c0f 100644
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--- a/src/journal/journald-stream.c
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+++ b/src/journal/journald-stream.c
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@@ -28,8 +28,11 @@
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 #endif
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 #include "sd-event.h"
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+#include "sd-daemon.h"
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 #include "socket-util.h"
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 #include "selinux-util.h"
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+#include "mkdir.h"
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+#include "fileio.h"
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 #include "journald-server.h"
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 #include "journald-stream.h"
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 #include "journald-syslog.h"
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@@ -66,14 +69,148 @@ struct StdoutStream {
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         bool forward_to_kmsg:1;
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         bool forward_to_console:1;
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+        bool fdstore:1;
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+
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         char buffer[LINE_MAX+1];
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         size_t length;
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         sd_event_source *event_source;
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+        char *state_file;
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+
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         LIST_FIELDS(StdoutStream, stdout_stream);
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 };
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+void stdout_stream_free(StdoutStream *s) {
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+        if (!s)
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+                return;
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+
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+        if (s->server) {
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+                assert(s->server->n_stdout_streams > 0);
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+                s->server->n_stdout_streams --;
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+                LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
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+        }
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+
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+        if (s->event_source) {
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+                sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
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+                s->event_source = sd_event_source_unref(s->event_source);
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+        }
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+
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+        safe_close(s->fd);
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+        free(s->label);
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+        free(s->identifier);
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+        free(s->unit_id);
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+        free(s->state_file);
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+
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+        free(s);
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+}
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+
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+DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
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+
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+static void stdout_stream_destroy(StdoutStream *s) {
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+        if (!s)
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+                return;
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+
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+        if (s->state_file)
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+                unlink(s->state_file);
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+
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+        stdout_stream_free(s);
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+}
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+
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+static int stdout_stream_save(StdoutStream *s) {
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+        _cleanup_free_ char *temp_path = NULL;
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+        _cleanup_fclose_ FILE *f = NULL;
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+        int r;
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+
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+        assert(s);
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+
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+        if (s->state != STDOUT_STREAM_RUNNING)
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+                return 0;
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+
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+        if (!s->state_file) {
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+                struct stat st;
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+
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+                r = fstat(s->fd, &st);
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+                if (r < 0)
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+                        return log_warning_errno(errno, "Failed to stat connected stream: %m");
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+
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+                /* We use device and inode numbers as identifier for the stream */
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+                if (asprintf(&s->state_file, "/run/systemd/journal/streams/%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
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+                        return log_oom();
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+        }
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+
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+        mkdir_p("/run/systemd/journal/streams", 0755);
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+
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+        r = fopen_temporary(s->state_file, &f, &temp_path);
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+        if (r < 0)
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+                goto finish;
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+
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+        fprintf(f,
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+                "# This is private data. Do not parse\n"
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+                "PRIORITY=%i\n"
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+                "LEVEL_PREFIX=%i\n"
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+                "FORWARD_TO_SYSLOG=%i\n"
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+                "FORWARD_TO_KMSG=%i\n"
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+                "FORWARD_TO_CONSOLE=%i\n",
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+                s->priority,
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+                s->level_prefix,
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+                s->forward_to_syslog,
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+                s->forward_to_kmsg,
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+                s->forward_to_console);
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+
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+        if (!isempty(s->identifier)) {
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+                _cleanup_free_ char *escaped;
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+
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+                escaped = cescape(s->identifier);
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+                if (!escaped) {
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+                        r = -ENOMEM;
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+                        goto finish;
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+                }
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+
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+                fprintf(f, "IDENTIFIER=%s\n", escaped);
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+        }
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+
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+        if (!isempty(s->unit_id)) {
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+                _cleanup_free_ char *escaped;
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+
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+                escaped = cescape(s->unit_id);
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+                if (!escaped) {
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+                        r = -ENOMEM;
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+                        goto finish;
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+                }
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+
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+                fprintf(f, "UNIT=%s\n", escaped);
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+        }
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+
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+        r = fflush_and_check(f);
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+        if (r < 0)
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+                goto finish;
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+
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+        if (rename(temp_path, s->state_file) < 0) {
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+                r = -errno;
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+                goto finish;
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+        }
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+
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+        free(temp_path);
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+        temp_path = NULL;
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+
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+        /* Store the connection fd in PID 1, so that we get it passed
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+         * in again on next start */
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+        if (!s->fdstore) {
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+                sd_pid_notify_with_fds(0, false, "FDSTORE=1", &s->fd, 1);
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+                s->fdstore = true;
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+        }
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+
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+finish:
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+        if (temp_path)
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+                unlink(temp_path);
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+
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+        if (r < 0)
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+                log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
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+
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+        return r;
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+}
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+
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 static int stdout_stream_log(StdoutStream *s, const char *p) {
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         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
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         int priority;
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@@ -219,6 +356,9 @@ static int stdout_stream_line(StdoutStream *s, char *p) {
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                 s->forward_to_console = !!r;
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                 s->state = STDOUT_STREAM_RUNNING;
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+
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+                /* Try to save the stream, so that journald can be restarted and we can recover */
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+                (void) stdout_stream_save(s);
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                 return 0;
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         case STDOUT_STREAM_RUNNING:
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@@ -313,36 +453,62 @@ static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents,
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         return 1;
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 terminate:
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-        stdout_stream_free(s);
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+        stdout_stream_destroy(s);
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         return 0;
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 }
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-void stdout_stream_free(StdoutStream *s) {
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+static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
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+        _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
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+        int r;
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+
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         assert(s);
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+        assert(fd >= 0);
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-        if (s->server) {
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-                assert(s->server->n_stdout_streams > 0);
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-                s->server->n_stdout_streams --;
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-                LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
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-        }
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+        stream = new0(StdoutStream, 1);
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+        if (!stream)
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+                return log_oom();
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-        if (s->event_source) {
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-                sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
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-                s->event_source = sd_event_source_unref(s->event_source);
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+        stream->fd = -1;
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+        stream->priority = LOG_INFO;
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+
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+        r = getpeercred(fd, &stream->ucred);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to determine peer credentials: %m");
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+
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+        if (mac_selinux_use()) {
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+                r = getpeersec(fd, &stream->label);
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+                if (r < 0 && r != -EOPNOTSUPP)
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+                        (void) log_warning_errno(r, "Failed to determine peer security context: %m");
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         }
dd65c9
 
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-        safe_close(s->fd);
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+        (void) shutdown(fd, SHUT_WR);
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-        free(s->label);
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-        free(s->identifier);
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-        free(s->unit_id);
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-        free(s);
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+        r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to add stream to event loop: %m");
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+
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+        r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
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+
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+        stream->fd = fd;
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+
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+        stream->server = s;
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+        LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
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+        s->n_stdout_streams ++;
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+
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+        if (ret)
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+                *ret = stream;
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+
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+        stream = NULL;
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+
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+        return 0;
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 }
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 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
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+        _cleanup_close_ int fd = -1;
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         Server *s = userdata;
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-        StdoutStream *stream;
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-        int fd, r;
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+        int r;
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         assert(s);
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@@ -362,61 +528,163 @@ static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revent
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         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
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                 log_warning("Too many stdout streams, refusing connection.");
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-                safe_close(fd);
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                 return 0;
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         }
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-        stream = new0(StdoutStream, 1);
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-        if (!stream) {
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-                safe_close(fd);
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-                return log_oom();
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+        r = stdout_stream_install(s, fd, NULL);
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+        if (r < 0)
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+                return r;
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+
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+        fd = -1;
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+        return 0;
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+}
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+
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+static int stdout_stream_load(StdoutStream *stream, const char *fname) {
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+        _cleanup_free_ char
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+                *priority = NULL,
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+                *level_prefix = NULL,
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+                *forward_to_syslog = NULL,
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+                *forward_to_kmsg = NULL,
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+                *forward_to_console = NULL;
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+        int r;
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+
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+        assert(stream);
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+        assert(fname);
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+
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+        if (!stream->state_file) {
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+                stream->state_file = strappend("/run/systemd/journal/streams/", fname);
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+                if (!stream->state_file)
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+                        return log_oom();
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         }
dd65c9
 
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-        stream->fd = fd;
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+        r = parse_env_file(stream->state_file, NEWLINE,
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+                           "PRIORITY", &priority,
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+                           "LEVEL_PREFIX", &level_prefix,
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+                           "FORWARD_TO_SYSLOG", &forward_to_syslog,
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+                           "FORWARD_TO_KMSG", &forward_to_kmsg,
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+                           "FORWARD_TO_CONSOLE", &forward_to_console,
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+                           "IDENTIFIER", &stream->identifier,
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+                           "UNIT", &stream->unit_id,
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+                           NULL);
dd65c9
+        if (r < 0)
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+                return log_error_errno(r, "Failed to read: %s", stream->state_file);
dd65c9
 
dd65c9
-        r = getpeercred(fd, &stream->ucred);
dd65c9
-        if (r < 0) {
dd65c9
-                log_error_errno(errno, "Failed to determine peer credentials: %m");
dd65c9
-                goto fail;
dd65c9
+        if (priority) {
dd65c9
+                int p;
dd65c9
+
dd65c9
+                p = log_level_from_string(priority);
dd65c9
+                if (p >= 0)
dd65c9
+                        stream->priority = p;
dd65c9
         }
dd65c9
 
dd65c9
-#ifdef HAVE_SELINUX
dd65c9
-        if (mac_selinux_use()) {
dd65c9
-                r = getpeersec(fd, &stream->label);
dd65c9
-                if (r < 0 && r != -EOPNOTSUPP)
dd65c9
-                        (void) log_warning_errno(r, "Failed to determine peer security context: %m");
dd65c9
+        if (level_prefix) {
dd65c9
+                r = parse_boolean(level_prefix);
dd65c9
+                if (r >= 0)
dd65c9
+                        stream->level_prefix = r;
dd65c9
         }
dd65c9
-#endif
dd65c9
 
dd65c9
-        if (shutdown(fd, SHUT_WR) < 0) {
dd65c9
-                log_error_errno(errno, "Failed to shutdown writing side of socket: %m");
dd65c9
-                goto fail;
dd65c9
+        if (forward_to_syslog) {
dd65c9
+                r = parse_boolean(forward_to_syslog);
dd65c9
+                if (r >= 0)
dd65c9
+                        stream->forward_to_syslog = r;
dd65c9
         }
dd65c9
 
dd65c9
-        r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
dd65c9
-        if (r < 0) {
dd65c9
-                log_error_errno(r, "Failed to add stream to event loop: %m");
dd65c9
-                goto fail;
dd65c9
+        if (forward_to_kmsg) {
dd65c9
+                r = parse_boolean(forward_to_kmsg);
dd65c9
+                if (r >= 0)
dd65c9
+                        stream->forward_to_kmsg = r;
dd65c9
         }
dd65c9
 
dd65c9
-        r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
dd65c9
-        if (r < 0) {
dd65c9
-                log_error_errno(r, "Failed to adjust stdout event source priority: %m");
dd65c9
-                goto fail;
dd65c9
+        if (forward_to_console) {
dd65c9
+                r = parse_boolean(forward_to_console);
dd65c9
+                if (r >= 0)
dd65c9
+                        stream->forward_to_console = r;
dd65c9
         }
dd65c9
 
dd65c9
-        stream->server = s;
dd65c9
-        LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
dd65c9
-        s->n_stdout_streams ++;
dd65c9
+        return 0;
dd65c9
+}
dd65c9
+
dd65c9
+static int stdout_stream_restore(Server *s, const char *fname, int fd) {
dd65c9
+        StdoutStream *stream;
dd65c9
+        int r;
dd65c9
+
dd65c9
+        assert(s);
dd65c9
+        assert(fname);
dd65c9
+        assert(fd >= 0);
dd65c9
+
dd65c9
+        if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
dd65c9
+                log_warning("Too many stdout streams, refusing restoring of stream.");
dd65c9
+                return -ENOBUFS;
dd65c9
+        }
dd65c9
+
dd65c9
+        r = stdout_stream_install(s, fd, &stream);
dd65c9
+        if (r < 0)
dd65c9
+                return r;
dd65c9
+
dd65c9
+        stream->state = STDOUT_STREAM_RUNNING;
dd65c9
+        stream->fdstore = true;
dd65c9
+
dd65c9
+        /* Ignore all parsing errors */
dd65c9
+        (void) stdout_stream_load(stream, fname);
dd65c9
 
dd65c9
         return 0;
dd65c9
+}
dd65c9
+
dd65c9
+static int server_restore_streams(Server *s, FDSet *fds) {
dd65c9
+        _cleanup_closedir_ DIR *d = NULL;
dd65c9
+        struct dirent *de;
dd65c9
+        int r;
dd65c9
+
dd65c9
+        d = opendir("/run/systemd/journal/streams");
dd65c9
+        if (!d) {
dd65c9
+                if (errno == ENOENT)
dd65c9
+                        return 0;
dd65c9
+
dd65c9
+                return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
dd65c9
+        }
dd65c9
+
dd65c9
+        FOREACH_DIRENT(de, d, goto fail) {
dd65c9
+                unsigned long st_dev, st_ino;
dd65c9
+                bool found = false;
dd65c9
+                Iterator i;
dd65c9
+                int fd;
dd65c9
+
dd65c9
+                if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
dd65c9
+                        continue;
dd65c9
+
dd65c9
+                FDSET_FOREACH(fd, fds, i) {
dd65c9
+                        struct stat st;
dd65c9
+
dd65c9
+                        if (fstat(fd, &st) < 0)
dd65c9
+                                return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
dd65c9
+
dd65c9
+                        if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
dd65c9
+                                found = true;
dd65c9
+                                break;
dd65c9
+                        }
dd65c9
+                }
dd65c9
+
dd65c9
+                if (!found) {
dd65c9
+                        /* No file descriptor? Then let's delete the state file */
dd65c9
+                        log_debug("Cannot restore stream file %s", de->d_name);
dd65c9
+                        unlinkat(dirfd(d), de->d_name, 0);
dd65c9
+                        continue;
dd65c9
+                }
dd65c9
+
dd65c9
+                fdset_remove(fds, fd);
dd65c9
+
dd65c9
+                r = stdout_stream_restore(s, de->d_name, fd);
dd65c9
+                if (r < 0)
dd65c9
+                        safe_close(fd);
dd65c9
+        }
dd65c9
 
dd65c9
-fail:
dd65c9
-        stdout_stream_free(stream);
dd65c9
         return 0;
dd65c9
+
dd65c9
+fail:
dd65c9
+        return log_error_errno(errno, "Failed to read streams directory: %m");
dd65c9
 }
dd65c9
 
dd65c9
-int server_open_stdout_socket(Server *s) {
dd65c9
+int server_open_stdout_socket(Server *s, FDSet *fds) {
dd65c9
         int r;
dd65c9
 
dd65c9
         assert(s);
dd65c9
@@ -452,5 +720,8 @@ int server_open_stdout_socket(Server *s) {
dd65c9
         if (r < 0)
dd65c9
                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
dd65c9
 
dd65c9
+        /* Try to restore streams, but don't bother if this fails */
dd65c9
+        (void) server_restore_streams(s, fds);
dd65c9
+
dd65c9
         return 0;
dd65c9
 }
dd65c9
diff --git a/src/journal/journald-stream.h b/src/journal/journald-stream.h
c62b8e
index 8cad012967..94bf955d78 100644
dd65c9
--- a/src/journal/journald-stream.h
dd65c9
+++ b/src/journal/journald-stream.h
dd65c9
@@ -21,8 +21,9 @@
dd65c9
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
dd65c9
 ***/
dd65c9
 
dd65c9
+#include "fdset.h"
dd65c9
 #include "journald-server.h"
dd65c9
 
dd65c9
-int server_open_stdout_socket(Server *s);
dd65c9
+int server_open_stdout_socket(Server *s, FDSet *fds);
dd65c9
 
dd65c9
 void stdout_stream_free(StdoutStream *s);