6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include <stdarg.h>

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include <stdio.h>

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include <errno.h>

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include <unistd.h>

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include <fcntl.h>

430f0182b72373145c839dbfe99d2382855cb8f8Lennart Poettering#include <sys/socket.h>

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include <sys/un.h>

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include <stddef.h>

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include <printf.h>

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "sd-messages.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "log.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "util.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "missing.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "macro.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "socket-util.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "formats-util.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "process-util.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#include "terminal-util.h"

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier#define SNDBUF_SIZE (8*1024*1024)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic LogTarget log_target = LOG_TARGET_CONSOLE;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int log_max_level = LOG_INFO;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int log_facility = LOG_DAEMON;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int console_fd = STDERR_FILENO;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int syslog_fd = -1;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int kmsg_fd = -1;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int journal_fd = -1;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic bool syslog_is_stream = false;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic bool show_color = false;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic bool show_location = false;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic bool upgrade_syslog_to_journal = false;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic char *log_abort_msg = NULL;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevaliervoid log_close_console(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (console_fd < 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (getpid() == 1) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (console_fd >= 3)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier safe_close(console_fd);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier console_fd = -1;

56f64d95763a799ba4475daf44d8e9f72a1bd474Michal Schmidt }

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int log_open_console(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (console_fd >= 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return 0;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (getpid() == 1) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (console_fd < 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return console_fd;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier } else

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier console_fd = STDERR_FILENO;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return 0;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevaliervoid log_close_kmsg(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier kmsg_fd = safe_close(kmsg_fd);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int log_open_kmsg(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (kmsg_fd >= 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return 0;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (kmsg_fd < 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return -errno;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return 0;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevaliervoid log_close_syslog(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier syslog_fd = safe_close(syslog_fd);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int create_log_socket(int type) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier struct timeval tv;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier int fd;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (fd < 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return -errno;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier fd_inc_sndbuf(fd, SNDBUF_SIZE);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier /* We need a blocking fd here since we'd otherwise lose

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (getpid() == 1)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier timeval_store(&tv, 10 * USEC_PER_MSEC);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier else

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier timeval_store(&tv, 10 * USEC_PER_SEC);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier (void) setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return fd;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier}

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalierstatic int log_open_syslog(void) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier static const union sockaddr_union sa = {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier .un.sun_family = AF_UNIX,

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier .un.sun_path = "/dev/log",

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier };

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier int r;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (syslog_fd >= 0)

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier return 0;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier syslog_fd = create_log_socket(SOCK_DGRAM);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (syslog_fd < 0) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier r = syslog_fd;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier goto fail;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier }

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier safe_close(syslog_fd);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier /* Some legacy syslog systems still use stream

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier syslog_fd = create_log_socket(SOCK_STREAM);

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier if (syslog_fd < 0) {

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier r = syslog_fd;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier goto fail;

6160e473fc2c52ab7c06f1d884a8901d2a5b6b73Ronny Chevalier }

if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {

r = -errno;

goto fail;

}

syslog_is_stream = true;

} else

syslog_is_stream = false;

return 0;

fail:

log_close_syslog();

return r;

}

void log_close_journal(void) {

journal_fd = safe_close(journal_fd);

}

static int log_open_journal(void) {

static const union sockaddr_union sa = {

.un.sun_family = AF_UNIX,

.un.sun_path = "/run/systemd/journal/socket",

};

int r;

if (journal_fd >= 0)

return 0;

journal_fd = create_log_socket(SOCK_DGRAM);

if (journal_fd < 0) {

r = journal_fd;

goto fail;

}

if (connect(journal_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {

r = -errno;

goto fail;

}

return 0;

fail:

log_close_journal();

return r;

}

int log_open(void) {

int r;

/* If we don't use the console we close it here, to not get

if (log_target == LOG_TARGET_NULL) {

log_close_journal();

log_close_syslog();

log_close_console();

return 0;

}

if ((log_target != LOG_TARGET_AUTO && log_target != LOG_TARGET_SAFE) ||

getpid() == 1 ||

isatty(STDERR_FILENO) <= 0) {

if (log_target == LOG_TARGET_AUTO ||

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_SAFE ||

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();

return log_open_console();

}

void log_set_target(LogTarget target) {

assert(target >= 0);

assert(target < _LOG_TARGET_MAX);

if (upgrade_syslog_to_journal) {

if (target == LOG_TARGET_SYSLOG)

target = LOG_TARGET_JOURNAL;

else if (target == LOG_TARGET_SYSLOG_OR_KMSG)

target = LOG_TARGET_JOURNAL_OR_KMSG;

}

log_target = target;

}

void log_close(void) {

log_close_journal();

log_close_syslog();

log_close_kmsg();

log_close_console();

}

void log_forget_fds(void) {

console_fd = kmsg_fd = syslog_fd = journal_fd = -1;

}

void log_set_max_level(int level) {

assert((level & LOG_PRIMASK) == level);

log_max_level = level;

}

void log_set_facility(int facility) {

log_facility = facility;

}

static int write_to_console(

int level,

int error,

const char *file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *buffer) {

char location[64], prefix[1 + DECIMAL_STR_MAX(int) + 2];

struct iovec iovec[6] = {};

unsigned n = 0;

bool highlight;

if (console_fd < 0)

return 0;

if (log_target == LOG_TARGET_CONSOLE_PREFIXED) {

sprintf(prefix, "<%i>", level);

IOVEC_SET_STRING(iovec[n++], prefix);

}

highlight = LOG_PRI(level) <= LOG_ERR && show_color;

if (show_location) {

snprintf(location, sizeof(location), "(%s:%i) ", file, line);

IOVEC_SET_STRING(iovec[n++], location);

}

if (highlight)

IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_RED_ON);

IOVEC_SET_STRING(iovec[n++], buffer);

if (highlight)

IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_OFF);

IOVEC_SET_STRING(iovec[n++], "\n");

if (writev(console_fd, iovec, n) < 0) {

if (errno == EIO && getpid() == 1) {

/* If somebody tried to kick us from our

log_close_console();

log_open_console();

if (console_fd < 0)

return 0;

if (writev(console_fd, iovec, n) < 0)

return -errno;

} else

return -errno;

}

return 1;

}

static int write_to_syslog(

int level,

int error,

const char *file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *buffer) {

char header_priority[2 + DECIMAL_STR_MAX(int) + 1],

header_time[64],

header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1];

struct iovec iovec[5] = {};

struct msghdr msghdr = {

.msg_iov = iovec,

.msg_iovlen = ELEMENTSOF(iovec),

};

time_t t;

struct tm *tm;

if (syslog_fd < 0)

return 0;

xsprintf(header_priority, "<%i>", level);

t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);

tm = localtime(&t);

if (!tm)

return -EINVAL;

if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)

return -EINVAL;

xsprintf(header_pid, "["PID_FMT"]: ", getpid());

IOVEC_SET_STRING(iovec[0], header_priority);

IOVEC_SET_STRING(iovec[1], header_time);

IOVEC_SET_STRING(iovec[2], program_invocation_short_name);

IOVEC_SET_STRING(iovec[3], header_pid);

IOVEC_SET_STRING(iovec[4], buffer);

/* When using syslog via SOCK_STREAM separate the messages by NUL chars */

if (syslog_is_stream)

iovec[4].iov_len++;

for (;;) {

ssize_t n;

n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);

if (n < 0)

return -errno;

if (!syslog_is_stream ||

(size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec)))

break;

IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n);

}

return 1;

}

static int write_to_kmsg(

int level,

int error,

const char*file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *buffer) {

char header_priority[2 + DECIMAL_STR_MAX(int) + 1],

header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1];

struct iovec iovec[5] = {};

if (kmsg_fd < 0)

return 0;

xsprintf(header_priority, "<%i>", level);

xsprintf(header_pid, "["PID_FMT"]: ", getpid());

IOVEC_SET_STRING(iovec[0], header_priority);

IOVEC_SET_STRING(iovec[1], program_invocation_short_name);

IOVEC_SET_STRING(iovec[2], header_pid);

IOVEC_SET_STRING(iovec[3], buffer);

IOVEC_SET_STRING(iovec[4], "\n");

if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)

return -errno;

return 1;

}

static int log_do_header(

char *header,

size_t size,

int level,

int error,

const char *file, int line, const char *func,

const char *object_field, const char *object) {

snprintf(header, size,

"PRIORITY=%i\n"

"SYSLOG_FACILITY=%i\n"

"%s%s%s"

"%s%.*i%s"

"%s%s%s"

"%s%.*i%s"

"%s%s%s"

"SYSLOG_IDENTIFIER=%s\n",

LOG_PRI(level),

LOG_FAC(level),

isempty(file) ? "" : "CODE_FILE=",

isempty(file) ? "" : file,

isempty(file) ? "" : "\n",

line ? "CODE_LINE=" : "",

line ? 1 : 0, line, /* %.0d means no output too, special case for 0 */

line ? "\n" : "",

isempty(func) ? "" : "CODE_FUNCTION=",

isempty(func) ? "" : func,

isempty(func) ? "" : "\n",

error ? "ERRNO=" : "",

error ? 1 : 0, error,

error ? "\n" : "",

isempty(object) ? "" : object_field,

isempty(object) ? "" : object,

isempty(object) ? "" : "\n",

program_invocation_short_name);

return 0;

}

static int write_to_journal(

int level,

int error,

const char*file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *buffer) {

char header[LINE_MAX];

struct iovec iovec[4] = {};

struct msghdr mh = {};

if (journal_fd < 0)

return 0;

log_do_header(header, sizeof(header), level, error, file, line, func, object_field, object);

IOVEC_SET_STRING(iovec[0], header);

IOVEC_SET_STRING(iovec[1], "MESSAGE=");

IOVEC_SET_STRING(iovec[2], buffer);

IOVEC_SET_STRING(iovec[3], "\n");

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,

int error,

const char *file,

int line,

const char *func,

const char *object_field,

const char *object,

char *buffer) {

assert(buffer);

if (log_target == LOG_TARGET_NULL)

return -error;

/* Patch in LOG_DAEMON facility if necessary */

if ((level & LOG_FACMASK) == 0)

level = log_facility | LOG_PRI(level);

if (error < 0)

error = -error;

do {

char *e;

int k = 0;

buffer += strspn(buffer, NEWLINE);

if (buffer[0] == 0)

break;

if ((e = strpbrk(buffer, NEWLINE)))

*(e++) = 0;

if (log_target == LOG_TARGET_AUTO ||

log_target == LOG_TARGET_JOURNAL_OR_KMSG ||

log_target == LOG_TARGET_JOURNAL) {

k = write_to_journal(level, error, file, line, func, object_field, object, buffer);

if (k < 0) {

if (k != -EAGAIN)

log_close_journal();

log_open_kmsg();

}

}

if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||

log_target == LOG_TARGET_SYSLOG) {

k = write_to_syslog(level, error, file, line, func, object_field, object, buffer);

if (k < 0) {

if (k != -EAGAIN)

log_close_syslog();

log_open_kmsg();

}

}

if (k <= 0 &&

(log_target == LOG_TARGET_AUTO ||

log_target == LOG_TARGET_SAFE ||

log_target == LOG_TARGET_SYSLOG_OR_KMSG ||

log_target == LOG_TARGET_JOURNAL_OR_KMSG ||

log_target == LOG_TARGET_KMSG)) {

k = write_to_kmsg(level, error, file, line, func, object_field, object, buffer);

if (k < 0) {

log_close_kmsg();

log_open_console();

}

}

if (k <= 0)

(void) write_to_console(level, error, file, line, func, object_field, object, buffer);

buffer = e;

} while (buffer);

return -error;

}

int log_dump_internal(

int level,

int error,

const char *file,

int line,

const char *func,

char *buffer) {

PROTECT_ERRNO;

/* This modifies the buffer... */

if (error < 0)

error = -error;

if (_likely_(LOG_PRI(level) > log_max_level))

return -error;

return log_dispatch(level, error, file, line, func, NULL, NULL, buffer);

}

int log_internalv(

int level,

int error,

const char*file,

int line,

const char *func,

const char *format,

va_list ap) {

PROTECT_ERRNO;

char buffer[LINE_MAX];

if (error < 0)

error = -error;

if (_likely_(LOG_PRI(level) > log_max_level))

return -error;

/* Make sure that %m maps to the specified error */

if (error != 0)

errno = error;

vsnprintf(buffer, sizeof(buffer), format, ap);

return log_dispatch(level, error, file, line, func, NULL, NULL, buffer);

}

int log_internal(

int level,

int error,

const char*file,

int line,

const char *func,

const char *format, ...) {

va_list ap;

int r;

va_start(ap, format);

r = log_internalv(level, error, file, line, func, format, ap);

va_end(ap);

return r;

}

int log_object_internalv(

int level,

int error,

const char*file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *format,

va_list ap) {

PROTECT_ERRNO;

char buffer[LINE_MAX];

if (error < 0)

error = -error;

if (_likely_(LOG_PRI(level) > log_max_level))

return -error;

/* Make sure that %m maps to the specified error */

if (error != 0)

errno = error;

vsnprintf(buffer, sizeof(buffer), format, ap);

return log_dispatch(level, error, file, line, func, object_field, object, buffer);

}

int log_object_internal(

int level,

int error,

const char*file,

int line,

const char *func,

const char *object_field,

const char *object,

const char *format, ...) {

va_list ap;

int r;

va_start(ap, format);

r = log_object_internalv(level, error, file, line, func, object_field, object, format, ap);

va_end(ap);

return r;

}

static void log_assert(

int level,

const char *text,

const char *file,

int line,

const char *func,

const char *format) {

static char buffer[LINE_MAX];

if (_likely_(LOG_PRI(level) > log_max_level))

return;

DISABLE_WARNING_FORMAT_NONLITERAL;

snprintf(buffer, sizeof(buffer), format, text, file, line, func);

REENABLE_WARNING;

log_abort_msg = buffer;

log_dispatch(level, 0, file, line, func, NULL, NULL, buffer);

}

noreturn void log_assert_failed(const char *text, const char *file, int line, const char *func) {

log_assert(LOG_CRIT, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting.");

abort();

}

noreturn void log_assert_failed_unreachable(const char *text, const char *file, int line, const char *func) {

log_assert(LOG_CRIT, text, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting.");

abort();

}

void log_assert_failed_return(const char *text, const char *file, int line, const char *func) {

PROTECT_ERRNO;

log_assert(LOG_DEBUG, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Ignoring.");

}

int log_oom_internal(const char *file, int line, const char *func) {

log_internal(LOG_ERR, ENOMEM, file, line, func, "Out of memory.");

return -ENOMEM;

}

int log_struct_internal(

int level,

int error,

const char *file,

int line,

const char *func,

const char *format, ...) {

char buf[LINE_MAX];

bool found = false;

PROTECT_ERRNO;

va_list ap;

if (error < 0)

error = -error;

if (_likely_(LOG_PRI(level) > log_max_level))

return -error;

if (log_target == LOG_TARGET_NULL)

return -error;

if ((level & LOG_FACMASK) == 0)

level = log_facility | LOG_PRI(level);

if ((log_target == LOG_TARGET_AUTO ||

log_target == LOG_TARGET_JOURNAL_OR_KMSG ||

log_target == LOG_TARGET_JOURNAL) &&

journal_fd >= 0) {

char header[LINE_MAX];

struct iovec iovec[17] = {};

unsigned n = 0, i;

struct msghdr mh = {

.msg_iov = iovec,

};

static const char nl = '\n';

bool fallback = false;

/* If the journal is available do structured logging */

log_do_header(header, sizeof(header), level, error, file, line, func, NULL, NULL);

IOVEC_SET_STRING(iovec[n++], header);

va_start(ap, format);

while (format && n + 1 < ELEMENTSOF(iovec)) {

va_list aq;

char *m;

/* We need to copy the va_list structure,

if (error != 0)

errno = error;

va_copy(aq, ap);

if (vasprintf(&m, format, aq) < 0) {

va_end(aq);

fallback = true;

goto finish;

}

va_end(aq);

/* Now, jump enough ahead, so that we point to

VA_FORMAT_ADVANCE(format, ap);

IOVEC_SET_STRING(iovec[n++], m);

iovec[n].iov_base = (char*) &nl;

iovec[n].iov_len = 1;

n++;

format = va_arg(ap, char *);

}

mh.msg_iovlen = n;

(void) sendmsg(journal_fd, &mh, MSG_NOSIGNAL);

finish:

va_end(ap);

for (i = 1; i < n; i += 2)

free(iovec[i].iov_base);

if (!fallback)

return -error;

}

/* Fallback if journal logging is not available or didn't work. */

va_start(ap, format);

while (format) {

va_list aq;

if (error != 0)

errno = error;

va_copy(aq, ap);

vsnprintf(buf, sizeof(buf), format, aq);

va_end(aq);

if (startswith(buf, "MESSAGE=")) {

found = true;

break;

}

VA_FORMAT_ADVANCE(format, ap);

format = va_arg(ap, char *);

}

va_end(ap);

if (!found)

return -error;

return log_dispatch(level, error, file, line, func, NULL, NULL, buf + 8);

}

int log_set_target_from_string(const char *e) {

LogTarget t;

t = log_target_from_string(e);

if (t < 0)

return -EINVAL;

log_set_target(t);

return 0;

}

int log_set_max_level_from_string(const char *e) {

int t;

t = log_level_from_string(e);

if (t < 0)

return t;

log_set_max_level(t);

return 0;

}

static int parse_proc_cmdline_item(const char *key, const char *value) {

/*

if (streq(key, "debug") && !value)

log_set_max_level(LOG_DEBUG);

else if (streq(key, "systemd.log_target") && value) {

if (log_set_target_from_string(value) < 0)

log_warning("Failed to parse log target '%s'. Ignoring.", value);

} else if (streq(key, "systemd.log_level") && value) {

if (log_set_max_level_from_string(value) < 0)

log_warning("Failed to parse log level '%s'. Ignoring.", value);

} else if (streq(key, "systemd.log_color") && value) {

if (log_show_color_from_string(value) < 0)

log_warning("Failed to parse log color setting '%s'. Ignoring.", value);

} else if (streq(key, "systemd.log_location") && value) {

if (log_show_location_from_string(value) < 0)

log_warning("Failed to parse log location setting '%s'. Ignoring.", value);

}

return 0;

}

void log_parse_environment(void) {

const char *e;

if (get_ctty_devnr(0, NULL) < 0)

/* Only try to read the command line in daemons.

(void) parse_proc_cmdline(parse_proc_cmdline_item);

e = secure_getenv("SYSTEMD_LOG_TARGET");

if (e && log_set_target_from_string(e) < 0)

log_warning("Failed to parse log target '%s'. Ignoring.", e);

e = secure_getenv("SYSTEMD_LOG_LEVEL");

if (e && log_set_max_level_from_string(e) < 0)

log_warning("Failed to parse log level '%s'. Ignoring.", e);

e = secure_getenv("SYSTEMD_LOG_COLOR");

if (e && log_show_color_from_string(e) < 0)

log_warning("Failed to parse bool '%s'. Ignoring.", e);

e = secure_getenv("SYSTEMD_LOG_LOCATION");

if (e && log_show_location_from_string(e) < 0)

log_warning("Failed to parse bool '%s'. Ignoring.", e);

}

LogTarget log_get_target(void) {

return log_target;

}

int log_get_max_level(void) {

return log_max_level;

}

void log_show_color(bool b) {

show_color = b;

}

bool log_get_show_color(void) {

return show_color;

}

void log_show_location(bool b) {

show_location = b;

}

bool log_get_show_location(void) {

return show_location;

}

int log_show_color_from_string(const char *e) {

int t;

t = parse_boolean(e);

if (t < 0)

return t;

log_show_color(t);

return 0;

}

int log_show_location_from_string(const char *e) {

int t;

t = parse_boolean(e);

if (t < 0)

return t;

log_show_location(t);

return 0;

}

bool log_on_console(void) {

if (log_target == LOG_TARGET_CONSOLE ||

log_target == LOG_TARGET_CONSOLE_PREFIXED)

return true;

return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0;

}

static const char *const log_target_table[_LOG_TARGET_MAX] = {

[LOG_TARGET_CONSOLE] = "console",

[LOG_TARGET_CONSOLE_PREFIXED] = "console-prefixed",

[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_AUTO] = "auto",

[LOG_TARGET_SAFE] = "safe",

[LOG_TARGET_NULL] = "null"

};

DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);

void log_received_signal(int level, const struct signalfd_siginfo *si) {

if (si->ssi_pid > 0) {

_cleanup_free_ char *p = NULL;

get_process_comm(si->ssi_pid, &p);

log_full(level,

"Received SIG%s from PID %"PRIu32" (%s).",

signal_to_string(si->ssi_signo),

si->ssi_pid, strna(p));

} else

log_full(level,

"Received SIG%s.",

signal_to_string(si->ssi_signo));

}

void log_set_upgrade_syslog_to_journal(bool b) {

upgrade_syslog_to_journal = b;

}

int log_syntax_internal(

const char *unit,

int level,

const char *config_file,

unsigned config_line,

int error,

const char *file,

int line,

const char *func,

const char *format, ...) {

PROTECT_ERRNO;

char buffer[LINE_MAX];

int r;

va_list ap;

if (error < 0)

error = -error;

if (_likely_(LOG_PRI(level) > log_max_level))

return -error;

if (log_target == LOG_TARGET_NULL)

return -error;

if (error != 0)

errno = error;

va_start(ap, format);

vsnprintf(buffer, sizeof(buffer), format, ap);

va_end(ap);

if (unit)

r = log_struct_internal(

level, error,

file, line, func,

getpid() == 1 ? "UNIT=%s" : "USER_UNIT=%s", unit,

LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION),

"CONFIG_FILE=%s", config_file,

"CONFIG_LINE=%u", config_line,

LOG_MESSAGE("[%s:%u] %s", config_file, config_line, buffer),

NULL);

else

r = log_struct_internal(

level, error,

file, line, func,

LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION),

"CONFIG_FILE=%s", config_file,

"CONFIG_LINE=%u", config_line,

LOG_MESSAGE("[%s:%u] %s", config_file, config_line, buffer),

NULL);

return r;

}