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log: make internal log api log directly to the journal

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This commit is contained in:
Lennart Poettering 2012-01-12 04:34:31 +01:00
parent 8a0f04e6a2
commit 5ba081b0fb
4 changed files with 170 additions and 40 deletions
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2
TODO
View File

@ -21,6 +21,8 @@ Bugfixes:
Features:
* clean up session cgroups that remain after logout (think sshd), but eventually run empty
* support "systemctl stop foobar@.service" to stop all units matching a certain template
* move to LGPL2+

2
src/journal/journal-send.c
View File

@ -195,7 +195,7 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
zero(sa);
sa.sun_family = AF_UNIX;
strncpy(sa.sun_path,"/run/systemd/journal/socket", sizeof(sa.sun_path));
strncpy(sa.sun_path, "/run/systemd/journal/socket", sizeof(sa.sun_path));
zero(mh);
mh.msg_name = &sa;

199
src/log.c
View File

@ -26,12 +26,14 @@
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
#include "log.h"
#include "util.h"
#include "macro.h"
#include "socket-util.h"
#define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)
#define SOCKET_TIMEOUT_USEC (5*USEC_PER_SEC)
static LogTarget log_target = LOG_TARGET_CONSOLE;
static int log_max_level = LOG_INFO;
@ -39,6 +41,7 @@ static int log_max_level = LOG_INFO;
static int console_fd = STDERR_FILENO;
static int syslog_fd = -1;
static int kmsg_fd = -1;
static int journal_fd = -1;
static bool syslog_is_stream = false;
@ -69,7 +72,8 @@ static int log_open_console(void) {
if (getpid() == 1) {
if ((console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (console_fd < 0) {
log_error("Failed to open /dev/console for logging: %s", strerror(-console_fd));
return console_fd;
}
@ -122,12 +126,14 @@ static int create_log_socket(int type) {
if (getpid() == 1)
/* systemd should not block on syslog */
type |= SOCK_NONBLOCK;
if ((fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0)) < 0)
fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0);
if (fd < 0)
return -errno;
/* Make sure we don't block for more than 5s when talking to
* syslog */
timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
timeval_store(&tv, SOCKET_TIMEOUT_USEC);
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
close_nointr_nofail(fd);
return -errno;
@ -137,10 +143,7 @@ static int create_log_socket(int type) {
}
static int log_open_syslog(void) {
union {
struct sockaddr sa;
struct sockaddr_un un;
} sa;
union sockaddr_union sa;
int r;
if (syslog_fd >= 0)
@ -150,8 +153,9 @@ static int log_open_syslog(void) {
sa.un.sun_family = AF_UNIX;
strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
if ((syslog_fd = create_log_socket(SOCK_DGRAM)) < 0) {
r = -errno;
syslog_fd = create_log_socket(SOCK_DGRAM);
if (syslog_fd < 0) {
r = syslog_fd;
goto fail;
}
@ -161,8 +165,9 @@ static int log_open_syslog(void) {
/* Some legacy syslog systems still use stream
* sockets. They really shouldn't. But what can we
* do... */
if ((syslog_fd = create_log_socket(SOCK_STREAM)) < 0) {
r = -errno;
syslog_fd = create_log_socket(SOCK_STREAM);
if (syslog_fd < 0) {
r = syslog_fd;
goto fail;
}
@ -185,6 +190,47 @@ fail:
return r;
}
void log_close_journal(void) {
if (journal_fd < 0)
return;
close_nointr_nofail(journal_fd);
journal_fd = -1;
}
static int log_open_journal(void) {
union sockaddr_union sa;
int r;
if (journal_fd >= 0)
return 0;
journal_fd = create_log_socket(SOCK_DGRAM);
if (journal_fd < 0) {
r = journal_fd;
goto fail;
}
zero(sa);
sa.un.sun_family = AF_UNIX;
strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
if (connect(journal_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
r = -errno;
goto fail;
}
log_debug("Successfully opened journal for logging.");
return 0;
fail:
log_close_journal();
log_debug("Failed to open journal for logging: %s", strerror(-r));
return r;
}
int log_open(void) {
int r;
@ -195,6 +241,7 @@ int log_open(void) {
* because there is no reason to close it. */
if (log_target == LOG_TARGET_NULL) {
log_close_journal();
log_close_syslog();
log_close_console();
return 0;
@ -205,22 +252,41 @@ int log_open(void) {
isatty(STDERR_FILENO) <= 0) {
if (log_target == LOG_TARGET_AUTO ||
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_SYSLOG)
if ((r = log_open_syslog()) >= 0) {
log_close_console();
return r;
}
if (log_target == LOG_TARGET_AUTO ||
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_KMSG)
if ((r = log_open_kmsg()) >= 0) {
log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
log_target == LOG_TARGET_JOURNAL) {
r = log_open_journal();
if (r >= 0) {
log_close_syslog();
log_close_console();
return r;
}
}
if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_SYSLOG) {
r = log_open_syslog();
if (r >= 0) {
log_close_journal();
log_close_console();
return r;
}
}
if (log_target == LOG_TARGET_AUTO ||
log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_KMSG) {
r = log_open_kmsg();
if (r >= 0) {
log_close_journal();
log_close_syslog();
log_close_console();
return r;
}
}
}
log_close_journal();
log_close_syslog();
/* Get the real /dev/console if we are PID=1, hence reopen */
@ -236,13 +302,14 @@ void log_set_target(LogTarget target) {
}
void log_close(void) {
log_close_console();
log_close_kmsg();
log_close_journal();
log_close_syslog();
log_close_kmsg();
log_close_console();
}
void log_forget_fds(void) {
console_fd = kmsg_fd = syslog_fd = -1;
console_fd = kmsg_fd = syslog_fd = journal_fd = -1;
}
void log_set_max_level(int level) {
@ -382,6 +449,48 @@ static int write_to_kmsg(
return 1;
}
static int write_to_journal(
int level,
const char*file,
int line,
const char *func,
const char *buffer) {
char header[LINE_MAX];
struct iovec iovec[3];
struct msghdr mh;
if (journal_fd < 0)
return 0;
snprintf(header, sizeof(header),
"PRIORITY=%i\n"
"CODE_FILE=%s\n"
"CODE_LINE=%i\n"
"CODE_FUNCTION=%s\n"
"MESSAGE=",
LOG_PRI(level),
file,
line,
func);
char_array_0(header);
zero(iovec);
IOVEC_SET_STRING(iovec[0], header);
IOVEC_SET_STRING(iovec[1], buffer);
IOVEC_SET_STRING(iovec[2], "\n");
zero(mh);
mh.msg_iov = iovec;
mh.msg_iovlen = ELEMENTSOF(iovec);
if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
return -errno;
return 1;
}
static int log_dispatch(
int level,
const char*file,
@ -411,7 +520,19 @@ static int log_dispatch(
*(e++) = 0;
if (log_target == LOG_TARGET_AUTO ||
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
log_target == LOG_TARGET_JOURNAL) {
k = write_to_journal(level, file, line, func, buffer);
if (k < 0) {
if (k != -EAGAIN)
log_close_journal();
log_open_kmsg();
} else if (k > 0)
r++;
}
if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_SYSLOG) {
k = write_to_syslog(level, file, line, func, buffer);
@ -524,7 +645,8 @@ void log_assert(
int log_set_target_from_string(const char *e) {
LogTarget t;
if ((t = log_target_from_string(e)) < 0)
t = log_target_from_string(e);
if (t < 0)
return -EINVAL;
log_set_target(t);
@ -534,8 +656,9 @@ int log_set_target_from_string(const char *e) {
int log_set_max_level_from_string(const char *e) {
int t;
if ((t = log_level_from_string(e)) < 0)
return -EINVAL;
t = log_level_from_string(e);
if (t < 0)
return t;
log_set_max_level(t);
return 0;
@ -580,8 +703,9 @@ void log_show_location(bool b) {
int log_show_color_from_string(const char *e) {
int t;
if ((t = parse_boolean(e)) < 0)
return -EINVAL;
t = parse_boolean(e);
if (t < 0)
return t;
log_show_color(t);
return 0;
@ -590,8 +714,9 @@ int log_show_color_from_string(const char *e) {
int log_show_location_from_string(const char *e) {
int t;
if ((t = parse_boolean(e)) < 0)
return -EINVAL;
t = parse_boolean(e);
if (t < 0)
return t;
log_show_location(t);
return 0;
@ -599,11 +724,13 @@ int log_show_location_from_string(const char *e) {
static const char *const log_target_table[] = {
[LOG_TARGET_CONSOLE] = "console",
[LOG_TARGET_SYSLOG] = "syslog",
[LOG_TARGET_KMSG] = "kmsg",
[LOG_TARGET_JOURNAL] = "journal",
[LOG_TARGET_JOURNAL_OR_KMSG] = "journal-or-kmsg",
[LOG_TARGET_SYSLOG] = "syslog",
[LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
[LOG_TARGET_NULL] = "null",
[LOG_TARGET_AUTO] = "auto"
[LOG_TARGET_AUTO] = "auto",
[LOG_TARGET_NULL] = "null"
};
DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);

7
src/log.h
View File

@ -27,14 +27,14 @@
#include "macro.h"
/* If set to SYSLOG and /dev/log can not be opened we fall back to
* KSMG. If KMSG fails, we fall back to CONSOLE */
typedef enum LogTarget{
LOG_TARGET_CONSOLE,
LOG_TARGET_KMSG,
LOG_TARGET_JOURNAL,
LOG_TARGET_JOURNAL_OR_KMSG,
LOG_TARGET_SYSLOG,
LOG_TARGET_SYSLOG_OR_KMSG,
LOG_TARGET_AUTO, /* console if stderr is tty, SYSLOG_OR_KMSG otherwise */
LOG_TARGET_AUTO, /* console if stderr is tty, JOURNAL_OR_KMSG otherwise */
LOG_TARGET_NULL,
_LOG_TARGET_MAX,
_LOG_TARGET_INVALID = -1
@ -60,6 +60,7 @@ void log_close(void);
void log_forget_fds(void);
void log_close_syslog(void);
void log_close_journal(void);
void log_close_kmsg(void);
void log_close_console(void);