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journal: set the _SYSTEMD_UNIT field for messages from terminated processes

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As described in

  https://bugs.freedesktop.org/show_bug.cgi?id=50184

the journal currently doesn't set fields such as _SYSTEMD_UNIT
properly for messages coming from processes that have already
terminated.  This means among other things that "systemctl status" may
not show some of the output of services that wrote messages just
before they exited.

This patch fixes this by having processes that log to the journal
write their unit identifier to journald when the connection to
/run/systemd/journal/stdout is opened.  Journald stores the unit ID
and uses it to fill in _SYSTEMD_UNIT when it cannot be obtained
normally (i.e. from the cgroup).  To prevent impersonating another
unit, this information is only used when the caller is root.

This doesn't fix the general problem of getting metadata about
messages from terminated processes (which requires some kernel
support), but it allows "systemctl status" and similar queries to do
the Right Thing for units that log via stdout/stderr.
This commit is contained in:
Eelco Dolstra 2012-06-21 16:40:47 -04:00 committed by Lennart Poettering
parent 3b0810c53c
commit 62bca2c657
7 changed files with 46 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/core/execute.c
View File

@ -176,7 +176,7 @@ static int open_null_as(int flags, int nfd) {
return r;
}
static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
int fd, r;
union sockaddr_union sa;
@ -205,6 +205,7 @@ static int connect_logger_as(const ExecContext *context, ExecOutput output, cons
}
dprintf(fd,
"%s\n"
"%s\n"
"%i\n"
"%i\n"
@ -212,6 +213,7 @@ static int connect_logger_as(const ExecContext *context, ExecOutput output, cons
"%i\n"
"%i\n",
context->syslog_identifier ? context->syslog_identifier : ident,
unit_id,
context->syslog_priority,
!!context->syslog_level_prefix,
output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
@ -311,7 +313,7 @@ static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty
}
}
static int setup_output(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
static int setup_output(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
ExecOutput o;
ExecInput i;
@ -358,7 +360,7 @@ static int setup_output(const ExecContext *context, int socket_fd, const char *i
case EXEC_OUTPUT_KMSG_AND_CONSOLE:
case EXEC_OUTPUT_JOURNAL:
case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
return connect_logger_as(context, o, ident, STDOUT_FILENO);
return connect_logger_as(context, o, ident, unit_id, STDOUT_FILENO);
case EXEC_OUTPUT_SOCKET:
assert(socket_fd >= 0);
@ -369,7 +371,7 @@ static int setup_output(const ExecContext *context, int socket_fd, const char *i
}
}
static int setup_error(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
static int setup_error(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
ExecOutput o, e;
ExecInput i;
@ -413,7 +415,7 @@ static int setup_error(const ExecContext *context, int socket_fd, const char *id
case EXEC_OUTPUT_KMSG_AND_CONSOLE:
case EXEC_OUTPUT_JOURNAL:
case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
return connect_logger_as(context, e, ident, STDERR_FILENO);
return connect_logger_as(context, e, ident, unit_id, STDERR_FILENO);
case EXEC_OUTPUT_SOCKET:
assert(socket_fd >= 0);
@ -913,6 +915,7 @@ int exec_spawn(ExecCommand *command,
CGroupBonding *cgroup_bondings,
CGroupAttribute *cgroup_attributes,
const char *cgroup_suffix,
const char *unit_id,
int idle_pipe[2],
pid_t *ret) {
@ -1101,14 +1104,14 @@ int exec_spawn(ExecCommand *command,
}
if (!keep_stdout) {
err = setup_output(context, socket_fd, path_get_file_name(command->path), apply_tty_stdin);
err = setup_output(context, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
if (err < 0) {
r = EXIT_STDOUT;
goto fail_child;
}
}
err = setup_error(context, socket_fd, path_get_file_name(command->path), apply_tty_stdin);
err = setup_error(context, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
if (err < 0) {
r = EXIT_STDERR;
goto fail_child;

1
src/core/execute.h
View File

@ -192,6 +192,7 @@ int exec_spawn(ExecCommand *command,
struct CGroupBonding *cgroup_bondings,
struct CGroupAttribute *cgroup_attributes,
const char *cgroup_suffix,
const char *unit_id,
int pipe_fd[2],
pid_t *ret);

1
src/core/mount.c
View File

@ -770,6 +770,7 @@ static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
UNIT(m)->cgroup_bondings,
UNIT(m)->cgroup_attributes,
NULL,
UNIT(m)->id,
NULL,
&pid)) < 0)
goto fail;

1
src/core/service.c
View File

@ -1810,6 +1810,7 @@ static int service_spawn(
UNIT(s)->cgroup_bondings,
UNIT(s)->cgroup_attributes,
is_control ? "control" : NULL,
UNIT(s)->id,
s->type == SERVICE_IDLE ? UNIT(s)->manager->idle_pipe : NULL,
&pid);

1
src/core/socket.c
View File

@ -1153,6 +1153,7 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
UNIT(s)->cgroup_bondings,
UNIT(s)->cgroup_attributes,
NULL,
UNIT(s)->id,
NULL,
&pid);

1
src/core/swap.c
View File

@ -590,6 +590,7 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
UNIT(s)->cgroup_bondings,
UNIT(s)->cgroup_attributes,
NULL,
UNIT(s)->id,
NULL,
&pid)) < 0)
goto fail;

42
src/journal/journald.c
View File

@ -77,6 +77,7 @@
typedef enum StdoutStreamState {
STDOUT_STREAM_IDENTIFIER,
STDOUT_STREAM_UNIT_ID,
STDOUT_STREAM_PRIORITY,
STDOUT_STREAM_LEVEL_PREFIX,
STDOUT_STREAM_FORWARD_TO_SYSLOG,
@ -97,6 +98,7 @@ struct StdoutStream {
#endif
char *identifier;
char *unit_id;
int priority;
bool level_prefix:1;
bool forward_to_syslog:1;
@ -458,7 +460,7 @@ static void dispatch_message_real(
struct iovec *iovec, unsigned n, unsigned m,
struct ucred *ucred,
struct timeval *tv,
const char *label, size_t label_len) {
const char *label, size_t label_len, const char *unit_id) {
char *pid = NULL, *uid = NULL, *gid = NULL,
*source_time = NULL, *boot_id = NULL, *machine_id = NULL,
@ -560,10 +562,11 @@ static void dispatch_message_real(
if (cg_pid_get_unit(ucred->pid, &t) >= 0) {
unit = strappend("_SYSTEMD_UNIT=", t);
free(t);
} else if (unit_id)
unit = strappend("_SYSTEMD_UNIT=", unit_id);
if (unit)
IOVEC_SET_STRING(iovec[n++], unit);
}
if (unit)
IOVEC_SET_STRING(iovec[n++], unit);
#ifdef HAVE_SELINUX
if (label) {
@ -702,7 +705,7 @@ static void driver_message(Server *s, sd_id128_t message_id, const char *format,
ucred.uid = getuid();
ucred.gid = getgid();
dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0);
dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL);
}
static void dispatch_message(Server *s,
@ -710,6 +713,7 @@ static void dispatch_message(Server *s,
struct ucred *ucred,
struct timeval *tv,
const char *label, size_t label_len,
const char *unit_id,
int priority) {
int rl;
char *path = NULL, *c;
@ -760,7 +764,7 @@ static void dispatch_message(Server *s,
free(path);
finish:
dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len);
dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id);
}
static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
@ -1126,7 +1130,7 @@ static void process_syslog_message(Server *s, const char *buf, struct ucred *ucr
if (message)
IOVEC_SET_STRING(iovec[n++], message);
dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority);
dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority);
free(message);
free(identifier);
@ -1204,7 +1208,7 @@ static void process_native_message(
if (e == p) {
/* Entry separator */
dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority);
n = 0;
priority = LOG_INFO;
@ -1354,7 +1358,7 @@ static void process_native_message(
forward_console(s, priority, identifier, message, ucred);
}
dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority);
finish:
for (j = 0; j < n; j++) {
@ -1477,7 +1481,7 @@ static int stdout_stream_log(StdoutStream *s, const char *p) {
}
#endif
dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority);
dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority);
free(message);
free(syslog_priority);
@ -1508,6 +1512,22 @@ static int stdout_stream_line(StdoutStream *s, char *p) {
}
}
s->state = STDOUT_STREAM_UNIT_ID;
return 0;
case STDOUT_STREAM_UNIT_ID:
if (s->ucred.uid == 0) {
if (isempty(p))
s->unit_id = NULL;
else {
s->unit_id = strdup(p);
if (!s->unit_id) {
log_error("Out of memory");
return -ENOMEM;
}
}
}
s->state = STDOUT_STREAM_PRIORITY;
return 0;
@ -1874,7 +1894,7 @@ static void proc_kmsg_line(Server *s, const char *p) {
if (message)
IOVEC_SET_STRING(iovec[n++], message);
dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority);
dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority);
finish:
free(message);