static int write_to_syslog(
int level,
int error,
const char *file,
int line,
const char *func,
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;
}
_public_ int sd_journal_send_with_location(const char *file, const char *line, const char *func, const char *format, ...) {
int r, i, j;
va_list ap;
struct iovec *iov = NULL;
char *f;
va_start(ap, format);
i = fill_iovec_sprintf(format, ap, 3, &iov);
va_end(ap);
if (_unlikely_(i < 0)) {
r = i;
goto finish;
}
ALLOCA_CODE_FUNC(f, func);
IOVEC_SET_STRING(iov[0], file);
IOVEC_SET_STRING(iov[1], line);
IOVEC_SET_STRING(iov[2], f);
r = sd_journal_sendv(iov, i);
finish:
for (j = 3; j < i; j++)
free(iov[j].iov_base);
free(iov);
return r;
}
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 write_to_console(
int level,
const char*file,
unsigned int line,
const char *func,
const char *buffer) {
struct iovec iovec[5];
unsigned n = 0;
if (console_fd < 0)
return 0;
zero(iovec);
IOVEC_SET_STRING(iovec[n++], "dracut-install: ");
if (show_location) {
char location[64];
if (snprintf(location, sizeof(location), "(%s:%u) ", file, line) <= 0)
return -errno;
IOVEC_SET_STRING(iovec[n++], location);
}
IOVEC_SET_STRING(iovec[n++], buffer);
IOVEC_SET_STRING(iovec[n++], "\n");
if (writev(console_fd, iovec, n) < 0)
return -errno;
return 1;
}
_public_ int sd_journal_printv(int priority, const char *format, va_list ap) {
/* FIXME: Instead of limiting things to LINE_MAX we could do a
C99 variable-length array on the stack here in a loop. */
char buffer[8 + LINE_MAX], p[sizeof("PRIORITY=")-1 + DECIMAL_STR_MAX(int) + 1];
struct iovec iov[2];
assert_return(priority >= 0, -EINVAL);
assert_return(priority <= 7, -EINVAL);
assert_return(format, -EINVAL);
xsprintf(p, "PRIORITY=%i", priority & LOG_PRIMASK);
memcpy(buffer, "MESSAGE=", 8);
vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
/* Strip trailing whitespace, keep prefix whitespace. */
(void) strstrip(buffer);
/* Suppress empty lines */
if (isempty(buffer+8))
return 0;
zero(iov);
IOVEC_SET_STRING(iov[0], buffer);
IOVEC_SET_STRING(iov[1], p);
return sd_journal_sendv(iov, 2);
}
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;
}
_public_ int sd_journal_perror_with_location(
const char *file, const char *line,
const char *func,
const char *message) {
struct iovec iov[6];
char *f;
ALLOCA_CODE_FUNC(f, func);
IOVEC_SET_STRING(iov[0], file);
IOVEC_SET_STRING(iov[1], line);
IOVEC_SET_STRING(iov[2], f);
return fill_iovec_perror_and_send(message, 3, iov);
}
static void do_journal_append(char *file)
{
struct iovec iovec[5];
int r, f, j = 0;
ssize_t n;
_cleanup_free_ char *bootchart_file = NULL, *bootchart_message = NULL,
*p = NULL;
bootchart_file = strappend("BOOTCHART_FILE=", file);
if (bootchart_file)
IOVEC_SET_STRING(iovec[j++], bootchart_file);
IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518");
IOVEC_SET_STRING(iovec[j++], "PRIORITY=7");
bootchart_message = strjoin("MESSAGE=Bootchart created: ", file, NULL);
if (bootchart_message)
IOVEC_SET_STRING(iovec[j++], bootchart_message);
p = malloc(9 + BOOTCHART_MAX);
if (!p) {
r = log_oom();
return;
}
memcpy(p, "BOOTCHART=", 10);
f = open(file, O_RDONLY);
if (f < 0) {
log_error("Failed to read bootchart data: %m\n");
return;
}
n = loop_read(f, p + 10, BOOTCHART_MAX, false);
if (n < 0) {
log_error("Failed to read bootchart data: %s\n", strerror(-n));
close(f);
return;
}
close(f);
iovec[j].iov_base = p;
iovec[j].iov_len = 10 + n;
j++;
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error("Failed to send bootchart: %s", strerror(-r));
}
static int do_journal_append(char *file) {
_cleanup_free_ char *bootchart_message = NULL;
_cleanup_free_ char *bootchart_file = NULL;
_cleanup_free_ char *p = NULL;
_cleanup_close_ int fd = -1;
struct iovec iovec[5];
int r, j = 0;
ssize_t n;
bootchart_file = strappend("BOOTCHART_FILE=", file);
if (!bootchart_file)
return log_oom();
IOVEC_SET_STRING(iovec[j++], bootchart_file);
IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518");
IOVEC_SET_STRING(iovec[j++], "PRIORITY=7");
bootchart_message = strjoin("MESSAGE=Bootchart created: ", file, NULL);
if (!bootchart_message)
return log_oom();
IOVEC_SET_STRING(iovec[j++], bootchart_message);
p = malloc(10 + BOOTCHART_MAX);
if (!p)
return log_oom();
memcpy(p, "BOOTCHART=", 10);
fd = open(file, O_RDONLY|O_CLOEXEC);
if (fd < 0)
return log_error_errno(errno, "Failed to open bootchart data \"%s\": %m", file);
n = loop_read(fd, p + 10, BOOTCHART_MAX, false);
if (n < 0)
return log_error_errno(n, "Failed to read bootchart data: %m");
iovec[j].iov_base = p;
iovec[j].iov_len = 10 + n;
j++;
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error_errno(r, "Failed to send bootchart: %m");
return 0;
}
void server_forward_kmsg(
Server *s,
int priority,
const char *identifier,
const char *message,
struct ucred *ucred) {
struct iovec iovec[5];
char header_priority[6], header_pid[16];
int n = 0;
char *ident_buf = NULL;
assert(s);
assert(priority >= 0);
assert(priority <= 999);
assert(message);
if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg))
return;
if (_unlikely_(s->dev_kmsg_fd < 0))
return;
/* Never allow messages with kernel facility to be written to
* kmsg, regardless where the data comes from. */
priority = syslog_fixup_facility(priority);
/* First: priority field */
snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
char_array_0(header_priority);
IOVEC_SET_STRING(iovec[n++], header_priority);
/* Second: identifier and PID */
if (ucred) {
if (!identifier) {
get_process_comm(ucred->pid, &ident_buf);
identifier = ident_buf;
}
snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
char_array_0(header_pid);
if (identifier)
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], header_pid);
} else if (identifier) {
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], ": ");
}
/* Fourth: message */
IOVEC_SET_STRING(iovec[n++], message);
IOVEC_SET_STRING(iovec[n++], "\n");
if (writev(s->dev_kmsg_fd, iovec, n) < 0)
log_debug("Failed to write to /dev/kmsg for logging: %m");
free(ident_buf);
}
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[256], 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);
IOVEC_SET_STRING(iovec[n++], buffer);
if (highlight)
IOVEC_SET_STRING(iovec[n++], ANSI_NORMAL);
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
* console tty (via vhangup() or suchlike),
* try to reconnect */
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;
}
_public_ int sd_journal_sendv_with_location(
const char *file, const char *line,
const char *func,
const struct iovec *iov, int n) {
struct iovec *niov;
char *f;
assert_return(iov, -EINVAL);
assert_return(n > 0, -EINVAL);
niov = alloca(sizeof(struct iovec) * (n + 3));
memcpy(niov, iov, sizeof(struct iovec) * n);
ALLOCA_CODE_FUNC(f, func);
IOVEC_SET_STRING(niov[n++], file);
IOVEC_SET_STRING(niov[n++], line);
IOVEC_SET_STRING(niov[n++], f);
return sd_journal_sendv(niov, n);
}
_public_ int sd_journal_printv(int priority, const char *format, va_list ap) {
/* FIXME: Instead of limiting things to LINE_MAX we could do a
C99 variable-length array on the stack here in a loop. */
char buffer[8 + LINE_MAX], p[11]; struct iovec iov[2];
assert_return(priority >= 0, -EINVAL);
assert_return(priority <= 7, -EINVAL);
assert_return(format, -EINVAL);
snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK);
char_array_0(p);
memcpy(buffer, "MESSAGE=", 8);
vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
char_array_0(buffer);
zero(iov);
IOVEC_SET_STRING(iov[0], buffer);
IOVEC_SET_STRING(iov[1], p);
return sd_journal_sendv(iov, 2);
}
int main(int argc, char* argv[]) {
int r, j = 0;
_cleanup_free_ char *p = NULL;
ssize_t n;
pid_t pid;
uid_t uid;
gid_t gid;
struct iovec iovec[14];
_cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
*core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
*core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *t = NULL;
prctl(PR_SET_DUMPABLE, 0);
if (argc != _ARG_MAX) {
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
log_error("Invalid number of arguments passed from kernel.");
r = -EINVAL;
goto finish;
}
r = parse_pid(argv[ARG_PID], &pid);
if (r < 0) {
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
log_error("Failed to parse PID.");
goto finish;
}
if (cg_pid_get_unit(pid, &t) >= 0) {
if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
/* Make sure we don't make use of the journal,
* if it's the journal which is crashing */
log_set_target(LOG_TARGET_KMSG);
log_open();
r = divert_coredump();
goto finish;
}
core_unit = strappend("COREDUMP_UNIT=", t);
} else if (cg_pid_get_user_unit(pid, &t) >= 0)
core_unit = strappend("COREDUMP_USER_UNIT=", t);
if (core_unit)
IOVEC_SET_STRING(iovec[j++], core_unit);
/* OK, now we know it's not the journal, hence make use of
* it */
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
r = parse_uid(argv[ARG_UID], &uid);
if (r < 0) {
log_error("Failed to parse UID.");
goto finish;
}
r = parse_gid(argv[ARG_GID], &gid);
if (r < 0) {
log_error("Failed to parse GID.");
goto finish;
}
core_pid = strappend("COREDUMP_PID=", argv[ARG_PID]);
if (core_pid)
IOVEC_SET_STRING(iovec[j++], core_pid);
core_uid = strappend("COREDUMP_UID=", argv[ARG_UID]);
if (core_uid)
IOVEC_SET_STRING(iovec[j++], core_uid);
core_gid = strappend("COREDUMP_GID=", argv[ARG_GID]);
if (core_gid)
IOVEC_SET_STRING(iovec[j++], core_gid);
core_signal = strappend("COREDUMP_SIGNAL=", argv[ARG_SIGNAL]);
if (core_signal)
IOVEC_SET_STRING(iovec[j++], core_signal);
core_comm = strappend("COREDUMP_COMM=", argv[ARG_COMM]);
if (core_comm)
IOVEC_SET_STRING(iovec[j++], core_comm);
#ifdef HAVE_LOGIND
if (sd_pid_get_session(pid, &t) >= 0) {
core_session = strappend("COREDUMP_SESSION=", t);
free(t);
if (core_session)
IOVEC_SET_STRING(iovec[j++], core_session);
}
#endif
if (get_process_exe(pid, &t) >= 0) {
core_exe = strappend("COREDUMP_EXE=", t);
free(t);
if (core_exe)
IOVEC_SET_STRING(iovec[j++], core_exe);
}
if (get_process_cmdline(pid, 0, false, &t) >= 0) {
core_cmdline = strappend("COREDUMP_CMDLINE=", t);
free(t);
if (core_cmdline)
IOVEC_SET_STRING(iovec[j++], core_cmdline);
}
core_timestamp = strjoin("COREDUMP_TIMESTAMP=", argv[ARG_TIMESTAMP], "000000", NULL);
if (core_timestamp)
IOVEC_SET_STRING(iovec[j++], core_timestamp);
IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") dumped core.", NULL);
if (core_message)
IOVEC_SET_STRING(iovec[j++], core_message);
/* Now, let's drop privileges to become the user who owns the
* segfaulted process and allocate the coredump memory under
* his uid. This also ensures that the credentials journald
* will see are the ones of the coredumping user, thus making
* sure the user himself gets access to the core dump. */
if (setresgid(gid, gid, gid) < 0 ||
setresuid(uid, uid, uid) < 0) {
log_error("Failed to drop privileges: %m");
r = -errno;
goto finish;
}
p = malloc(9 + COREDUMP_MAX);
if (!p) {
r = log_oom();
goto finish;
}
memcpy(p, "COREDUMP=", 9);
n = loop_read(STDIN_FILENO, p + 9, COREDUMP_MAX, false);
if (n < 0) {
log_error("Failed to read core dump data: %s", strerror(-n));
r = (int) n;
goto finish;
}
iovec[j].iov_base = p;
iovec[j].iov_len = 9 + n;
j++;
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error("Failed to send coredump: %s", strerror(-r));
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
static int server_process_entry(
Server *s,
const void *buffer, size_t *remaining,
ClientContext *context,
const struct ucred *ucred,
const struct timeval *tv,
const char *label, size_t label_len) {
/* Process a single entry from a native message.
* Returns 0 if nothing special happened and the message processing should continue,
* and a negative or positive value otherwise.
*
* Note that *remaining is altered on both success and failure. */
struct iovec *iovec = NULL;
unsigned n = 0, j, tn = (unsigned) -1;
const char *p;
size_t m = 0, entry_size = 0;
int priority = LOG_INFO;
char *identifier = NULL, *message = NULL;
pid_t object_pid = 0;
int r = 0;
p = buffer;
while (*remaining > 0) {
const char *e, *q;
e = memchr(p, '\n', *remaining);
if (!e) {
/* Trailing noise, let's ignore it, and flush what we collected */
log_debug("Received message with trailing noise, ignoring.");
r = 1; /* finish processing of the message */
break;
}
if (e == p) {
/* Entry separator */
*remaining -= 1;
break;
}
if (*p == '.' || *p == '#') {
/* Ignore control commands for now, and
* comments too. */
*remaining -= (e - p) + 1;
p = e + 1;
continue;
}
/* A property follows */
/* n existing properties, 1 new, +1 for _TRANSPORT */
if (!GREEDY_REALLOC(iovec, m, n + 2 + N_IOVEC_META_FIELDS + N_IOVEC_OBJECT_FIELDS)) {
r = log_oom();
break;
}
q = memchr(p, '=', e - p);
if (q) {
if (valid_user_field(p, q - p, false)) {
size_t l;
l = e - p;
/* If the field name starts with an
* underscore, skip the variable,
* since that indicates a trusted
* field */
iovec[n].iov_base = (char*) p;
iovec[n].iov_len = l;
entry_size += l;
n++;
server_process_entry_meta(p, l, ucred,
&priority,
&identifier,
&message,
&object_pid);
}
*remaining -= (e - p) + 1;
p = e + 1;
continue;
} else {
uint64_t l;
char *k;
if (*remaining < e - p + 1 + sizeof(uint64_t) + 1) {
log_debug("Failed to parse message, ignoring.");
break;
}
l = unaligned_read_le64(e + 1);
if (l > DATA_SIZE_MAX) {
log_debug("Received binary data block of %"PRIu64" bytes is too large, ignoring.", l);
break;
}
if ((uint64_t) *remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
e[1+sizeof(uint64_t)+l] != '\n') {
log_debug("Failed to parse message, ignoring.");
break;
}
k = malloc((e - p) + 1 + l);
if (!k) {
log_oom();
break;
}
memcpy(k, p, e - p);
k[e - p] = '=';
memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
if (valid_user_field(p, e - p, false)) {
iovec[n].iov_base = k;
iovec[n].iov_len = (e - p) + 1 + l;
entry_size += iovec[n].iov_len;
n++;
server_process_entry_meta(k, (e - p) + 1 + l, ucred,
&priority,
&identifier,
&message,
&object_pid);
} else
free(k);
*remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
p = e + 1 + sizeof(uint64_t) + l + 1;
}
}
if (n <= 0) {
r = 1;
goto finish;
}
tn = n++;
IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
entry_size += strlen("_TRANSPORT=journal");
if (entry_size + n + 1 > ENTRY_SIZE_MAX) { /* data + separators + trailer */
log_debug("Entry is too big with %u properties and %zu bytes, ignoring.",
n, entry_size);
goto finish;
}
if (message) {
if (s->forward_to_syslog)
server_forward_syslog(s, syslog_fixup_facility(priority), identifier, message, ucred, tv);
if (s->forward_to_kmsg)
server_forward_kmsg(s, priority, identifier, message, ucred);
if (s->forward_to_console)
server_forward_console(s, priority, identifier, message, ucred);
if (s->forward_to_wall)
server_forward_wall(s, priority, identifier, message, ucred);
}
server_dispatch_message(s, iovec, n, m, context, tv, priority, object_pid);
finish:
for (j = 0; j < n; j++) {
if (j == tn)
continue;
if (iovec[j].iov_base < buffer ||
(const char*) iovec[j].iov_base >= p + *remaining)
free(iovec[j].iov_base);
}
free(iovec);
free(identifier);
free(message);
return r;
}
int main(int argc, char* argv[]) {
/* The small core field we allocate on the stack, to keep things simple */
char
*core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
*core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL,
*core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL,
*core_slice = NULL;
/* The larger ones we allocate on the heap */
_cleanup_free_ char
*core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL,
*core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL,
*core_proc_cgroup = NULL, *core_environ = NULL;
_cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL;
const char *info[_INFO_LEN];
_cleanup_close_ int coredump_fd = -1;
struct iovec iovec[26];
uint64_t coredump_size;
int r, j = 0;
uid_t uid, owner_uid;
gid_t gid;
pid_t pid;
char *t;
const char *p;
/* Make sure we never enter a loop */
prctl(PR_SET_DUMPABLE, 0);
/* First, log to a safe place, since we don't know what
* crashed and it might be journald which we'd rather not log
* to then. */
log_set_target(LOG_TARGET_KMSG);
log_open();
if (argc < INFO_COMM + 1) {
log_error("Not enough arguments passed from kernel (%d, expected %d).",
argc - 1, INFO_COMM + 1 - 1);
r = -EINVAL;
goto finish;
}
/* Ignore all parse errors */
parse_config();
log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
log_debug("Selected compression %s.", yes_no(arg_compress));
r = parse_uid(argv[INFO_UID + 1], &uid);
if (r < 0) {
log_error("Failed to parse UID.");
goto finish;
}
r = parse_pid(argv[INFO_PID + 1], &pid);
if (r < 0) {
log_error("Failed to parse PID.");
goto finish;
}
r = parse_gid(argv[INFO_GID + 1], &gid);
if (r < 0) {
log_error("Failed to parse GID.");
goto finish;
}
if (get_process_comm(pid, &comm) < 0) {
log_warning("Failed to get COMM, falling back to the command line.");
comm = strv_join(argv + INFO_COMM + 1, " ");
}
if (get_process_exe(pid, &exe) < 0)
log_warning("Failed to get EXE.");
info[INFO_PID] = argv[INFO_PID + 1];
info[INFO_UID] = argv[INFO_UID + 1];
info[INFO_GID] = argv[INFO_GID + 1];
info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1];
info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1];
info[INFO_COMM] = comm;
info[INFO_EXE] = exe;
if (cg_pid_get_unit(pid, &t) >= 0) {
if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
free(t);
/* If we are journald, we cut things short,
* don't write to the journal, but still
* create a coredump. */
if (arg_storage != COREDUMP_STORAGE_NONE)
arg_storage = COREDUMP_STORAGE_EXTERNAL;
r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
if (r < 0)
goto finish;
r = maybe_remove_external_coredump(filename, coredump_size);
if (r < 0)
goto finish;
log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename);
goto finish;
}
core_unit = strjoina("COREDUMP_UNIT=", t);
free(t);
} else if (cg_pid_get_user_unit(pid, &t) >= 0) {
core_unit = strjoina("COREDUMP_USER_UNIT=", t);
free(t);
}
if (core_unit)
IOVEC_SET_STRING(iovec[j++], core_unit);
/* OK, now we know it's not the journal, hence we can make use
* of it now. */
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]);
IOVEC_SET_STRING(iovec[j++], core_pid);
core_uid = strjoina("COREDUMP_UID=", info[INFO_UID]);
IOVEC_SET_STRING(iovec[j++], core_uid);
core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]);
IOVEC_SET_STRING(iovec[j++], core_gid);
core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]);
IOVEC_SET_STRING(iovec[j++], core_signal);
if (sd_pid_get_session(pid, &t) >= 0) {
core_session = strjoina("COREDUMP_SESSION=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_session);
}
if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) {
r = asprintf(&core_owner_uid,
"COREDUMP_OWNER_UID=" UID_FMT, owner_uid);
if (r > 0)
IOVEC_SET_STRING(iovec[j++], core_owner_uid);
}
if (sd_pid_get_slice(pid, &t) >= 0) {
core_slice = strjoina("COREDUMP_SLICE=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_slice);
}
if (comm) {
core_comm = strjoina("COREDUMP_COMM=", comm);
IOVEC_SET_STRING(iovec[j++], core_comm);
}
if (exe) {
core_exe = strjoina("COREDUMP_EXE=", exe);
IOVEC_SET_STRING(iovec[j++], core_exe);
}
if (get_process_cmdline(pid, 0, false, &t) >= 0) {
core_cmdline = strjoina("COREDUMP_CMDLINE=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_cmdline);
}
if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) {
core_cgroup = strjoina("COREDUMP_CGROUP=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_cgroup);
}
if (compose_open_fds(pid, &t) >= 0) {
core_open_fds = strappend("COREDUMP_OPEN_FDS=", t);
free(t);
if (core_open_fds)
IOVEC_SET_STRING(iovec[j++], core_open_fds);
}
p = procfs_file_alloca(pid, "status");
if (read_full_file(p, &t, NULL) >= 0) {
core_proc_status = strappend("COREDUMP_PROC_STATUS=", t);
free(t);
if (core_proc_status)
IOVEC_SET_STRING(iovec[j++], core_proc_status);
}
p = procfs_file_alloca(pid, "maps");
if (read_full_file(p, &t, NULL) >= 0) {
core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t);
free(t);
if (core_proc_maps)
IOVEC_SET_STRING(iovec[j++], core_proc_maps);
}
p = procfs_file_alloca(pid, "limits");
if (read_full_file(p, &t, NULL) >= 0) {
core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t);
free(t);
if (core_proc_limits)
IOVEC_SET_STRING(iovec[j++], core_proc_limits);
}
p = procfs_file_alloca(pid, "cgroup");
if (read_full_file(p, &t, NULL) >=0) {
core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t);
free(t);
if (core_proc_cgroup)
IOVEC_SET_STRING(iovec[j++], core_proc_cgroup);
}
if (get_process_cwd(pid, &t) >= 0) {
core_cwd = strjoina("COREDUMP_CWD=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_cwd);
}
if (get_process_root(pid, &t) >= 0) {
core_root = strjoina("COREDUMP_ROOT=", t);
free(t);
IOVEC_SET_STRING(iovec[j++], core_root);
}
if (get_process_environ(pid, &t) >= 0) {
core_environ = strappend("COREDUMP_ENVIRON=", t);
free(t);
if (core_environ)
IOVEC_SET_STRING(iovec[j++], core_environ);
}
core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL);
if (core_timestamp)
IOVEC_SET_STRING(iovec[j++], core_timestamp);
IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
/* Vacuum before we write anything again */
coredump_vacuum(-1, arg_keep_free, arg_max_use);
/* Always stream the coredump to disk, if that's possible */
r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
if (r < 0)
/* skip whole core dumping part */
goto log;
/* If we don't want to keep the coredump on disk, remove it
* now, as later on we will lack the privileges for
* it. However, we keep the fd to it, so that we can still
* process it and log it. */
r = maybe_remove_external_coredump(filename, coredump_size);
if (r < 0)
goto finish;
if (r == 0) {
const char *coredump_filename;
coredump_filename = strjoina("COREDUMP_FILENAME=", filename);
IOVEC_SET_STRING(iovec[j++], coredump_filename);
}
/* Vacuum again, but exclude the coredump we just created */
coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use);
/* Now, let's drop privileges to become the user who owns the
* segfaulted process and allocate the coredump memory under
* the user's uid. This also ensures that the credentials
* journald will see are the ones of the coredumping user,
* thus making sure the user gets access to the core
* dump. Let's also get rid of all capabilities, if we run as
* root, we won't need them anymore. */
r = drop_privileges(uid, gid, 0);
if (r < 0) {
log_error_errno(r, "Failed to drop privileges: %m");
goto finish;
}
#ifdef HAVE_ELFUTILS
/* Try to get a strack trace if we can */
if (coredump_size <= arg_process_size_max) {
_cleanup_free_ char *stacktrace = NULL;
r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace);
if (r >= 0)
core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL);
else if (r == -EINVAL)
log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno()));
else
log_warning_errno(r, "Failed to generate stack trace: %m");
}
if (!core_message)
#endif
log:
core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL);
if (core_message)
IOVEC_SET_STRING(iovec[j++], core_message);
/* Optionally store the entire coredump in the journal */
if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
coredump_size <= arg_journal_size_max) {
size_t sz = 0;
/* Store the coredump itself in the journal */
r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz);
if (r >= 0) {
iovec[j].iov_base = coredump_data;
iovec[j].iov_len = sz;
j++;
}
}
r = sd_journal_sendv(iovec, j);
if (r < 0)
log_error_errno(r, "Failed to log coredump: %m");
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
_printf_(1, 0) static int fill_iovec_sprintf(const char *format, va_list ap, int extra, struct iovec **_iov) {
PROTECT_ERRNO;
int r, n = 0, i = 0, j;
struct iovec *iov = NULL;
assert(_iov);
if (extra > 0) {
n = MAX(extra * 2, extra + 4);
iov = malloc0(n * sizeof(struct iovec));
if (!iov) {
r = -ENOMEM;
goto fail;
}
i = extra;
}
while (format) {
struct iovec *c;
char *buffer;
va_list aq;
if (i >= n) {
n = MAX(i*2, 4);
c = realloc(iov, n * sizeof(struct iovec));
if (!c) {
r = -ENOMEM;
goto fail;
}
iov = c;
}
va_copy(aq, ap);
if (vasprintf(&buffer, format, aq) < 0) {
va_end(aq);
r = -ENOMEM;
goto fail;
}
va_end(aq);
VA_FORMAT_ADVANCE(format, ap);
IOVEC_SET_STRING(iov[i++], buffer);
format = va_arg(ap, char *);
}
*_iov = iov;
return i;
fail:
for (j = 0; j < i; j++)
free(iov[j].iov_base);
free(iov);
return r;
}
_public_ int sd_journal_sendv(const struct iovec *iov, int n) {
PROTECT_ERRNO;
int fd;
struct iovec *w;
uint64_t *l;
int i, j = 0;
struct sockaddr_un sa = {
.sun_family = AF_UNIX,
.sun_path = JOURNAL_RUNDIR "/socket",
};
struct msghdr mh = {
.msg_name = &sa,
.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path),
};
ssize_t k;
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(int))];
} control;
bool have_syslog_identifier = false;
assert_return(iov, -EINVAL);
assert_return(n > 0, -EINVAL);
w = alloca(sizeof(struct iovec) * n * 5 + 3);
l = alloca(sizeof(uint64_t) * n);
for (i = 0; i < n; i++) {
char *c, *nl;
if (_unlikely_(!iov[i].iov_base || iov[i].iov_len <= 1))
return -EINVAL;
c = memchr(iov[i].iov_base, '=', iov[i].iov_len);
if (_unlikely_(!c || c == iov[i].iov_base))
return -EINVAL;
have_syslog_identifier = have_syslog_identifier ||
(c == (char *) iov[i].iov_base + 17 &&
startswith(iov[i].iov_base, "SYSLOG_IDENTIFIER"));
nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len);
if (nl) {
if (_unlikely_(nl < c))
return -EINVAL;
/* Already includes a newline? Bummer, then
* let's write the variable name, then a
* newline, then the size (64bit LE), followed
* by the data and a final newline */
w[j].iov_base = iov[i].iov_base;
w[j].iov_len = c - (char*) iov[i].iov_base;
j++;
IOVEC_SET_STRING(w[j++], "\n");
l[i] = htole64(iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1);
w[j].iov_base = &l[i];
w[j].iov_len = sizeof(uint64_t);
j++;
w[j].iov_base = c + 1;
w[j].iov_len = iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1;
j++;
} else
/* Nothing special? Then just add the line and
* append a newline */
w[j++] = iov[i];
IOVEC_SET_STRING(w[j++], "\n");
}
if (!have_syslog_identifier) {
/* Implicitly add program_invocation_short_name, if it
* is not set explicitly. We only do this for
* program_invocation_short_name, and nothing else
* since everything else is much nicer to retrieve
* from the outside. */
IOVEC_SET_STRING(w[j++], "SYSLOG_IDENTIFIER=");
IOVEC_SET_STRING(w[j++], program_invocation_short_name);
IOVEC_SET_STRING(w[j++], "\n");
}
fd = journal_fd();
if (_unlikely_(fd < 0))
return fd;
mh.msg_iov = w;
mh.msg_iovlen = j;
k = sendmsg(fd, &mh, MSG_NOSIGNAL);
if (k >= 0)
return 0;
/* Fail silently if the journal is not available */
if (errno == ENOENT)
return 0;
if (errno != EMSGSIZE && errno != ENOBUFS)
return -errno;
return 0;
}
static int fill_iovec_perror_and_send(const char *message, int skip, struct iovec iov[]) {
PROTECT_ERRNO;
size_t n, k;
k = isempty(message) ? 0 : strlen(message) + 2;
n = 8 + k + 256 + 1;
for (;;) {
char buffer[n];
char* j;
errno = 0;
j = strerror_r(_saved_errno_, buffer + 8 + k, n - 8 - k);
if (errno == 0) {
char error[6 + 10 + 1]; /* for a 32bit value */
if (j != buffer + 8 + k)
memmove(buffer + 8 + k, j, strlen(j)+1);
memcpy(buffer, "MESSAGE=", 8);
if (k > 0) {
memcpy(buffer + 8, message, k - 2);
memcpy(buffer + 8 + k - 2, ": ", 2);
}
snprintf(error, sizeof(error), "ERRNO=%u", _saved_errno_);
char_array_0(error);
IOVEC_SET_STRING(iov[skip+0], "PRIORITY=3");
IOVEC_SET_STRING(iov[skip+1], buffer);
IOVEC_SET_STRING(iov[skip+2], error);
return sd_journal_sendv(iov, skip + 3);
}
if (errno != ERANGE)
return -errno;
n *= 2;
}
}
_public_ int sd_journal_perror(const char *message) {
struct iovec iovec[3];
return fill_iovec_perror_and_send(message, 0, iovec);
}
void server_forward_console(
Server *s,
int priority,
const char *identifier,
const char *message,
const struct ucred *ucred) {
struct iovec iovec[5];
struct timespec ts;
char tbuf[sizeof("[] ")-1 + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1];
char header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t)];
int n = 0, fd;
_cleanup_free_ char *ident_buf = NULL;
const char *tty;
assert(s);
assert(message);
if (LOG_PRI(priority) > s->max_level_console)
return;
/* First: timestamp */
if (prefix_timestamp()) {
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
xsprintf(tbuf, "[%5"PRI_TIME".%06ld] ",
ts.tv_sec,
ts.tv_nsec / 1000);
IOVEC_SET_STRING(iovec[n++], tbuf);
}
/* Second: identifier and PID */
if (ucred) {
if (!identifier) {
get_process_comm(ucred->pid, &ident_buf);
identifier = ident_buf;
}
xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid);
if (identifier)
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], header_pid);
} else if (identifier) {
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], ": ");
}
/* Fourth: message */
IOVEC_SET_STRING(iovec[n++], message);
IOVEC_SET_STRING(iovec[n++], "\n");
tty = s->tty_path ? s->tty_path : "/dev/console";
/* Before you ask: yes, on purpose we open/close the console for each log line we write individually. This is a
* good strategy to avoid journald getting killed by the kernel's SAK concept (it doesn't fix this entirely,
* but minimizes the time window the kernel might end up killing journald due to SAK). It also makes things
* easier for us so that we don't have to recover from hangups and suchlike triggered on the console. */
fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0) {
log_debug_errno(fd, "Failed to open %s for logging: %m", tty);
return;
}
if (writev(fd, iovec, n) < 0)
log_debug_errno(errno, "Failed to write to %s for logging: %m", tty);
safe_close(fd);
}
static int write_message(Server *s, const char *buf, struct ucred *ucred) {
ssize_t k;
char priority[6], pid[16];
struct iovec iovec[5];
unsigned i = 0;
char *process = NULL;
int r = 0;
int prio = LOG_USER | LOG_INFO;
assert(s);
assert(buf);
parse_syslog_priority((char**) &buf, &prio);
if (*buf == 0)
return 0;
if ((prio & LOG_FACMASK) == 0)
prio = LOG_USER | LOG_PRI(prio);
/* First, set priority field */
snprintf(priority, sizeof(priority), "<%i>", prio);
char_array_0(priority);
IOVEC_SET_STRING(iovec[i++], priority);
/* Second, skip date */
skip_date(&buf);
/* Then, add process if set */
if (read_process(&buf, &iovec[i]) > 0)
i++;
else if (ucred &&
ucred->pid > 0 &&
get_process_name(ucred->pid, &process) >= 0)
IOVEC_SET_STRING(iovec[i++], process);
/* Skip the stored PID if we have a better one */
if (ucred) {
snprintf(pid, sizeof(pid), "[%lu]: ", (unsigned long) ucred->pid);
char_array_0(pid);
IOVEC_SET_STRING(iovec[i++], pid);
skip_pid(&buf);
if (*buf == ':')
buf++;
buf += strspn(buf, WHITESPACE);
}
/* Is the remaining message empty? */
if (*buf) {
/* And the rest is the message */
IOVEC_SET_STRING(iovec[i++], buf);
IOVEC_SET_STRING(iovec[i++], "\n");
if ((k = writev(s->kmsg_fd, iovec, i)) <= 0) {
log_error("Failed to write log message to kmsg: %s", k < 0 ? strerror(errno) : "short write");
r = k < 0 ? -errno : -EIO;
}
}
free(process);
return r;
}
static void dev_kmsg_record(Server *s, char *p, size_t l) {
struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS];
char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
int priority, r;
unsigned n = 0, z = 0, j;
unsigned long long usec;
char *identifier = NULL, *pid = NULL, *e, *f, *k;
uint64_t serial;
size_t pl;
char *kernel_device = NULL;
assert(s);
assert(p);
if (l <= 0)
return;
e = memchr(p, ',', l);
if (!e)
return;
*e = 0;
r = safe_atoi(p, &priority);
if (r < 0 || priority < 0 || priority > 999)
return;
if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
return;
l -= (e - p) + 1;
p = e + 1;
e = memchr(p, ',', l);
if (!e)
return;
*e = 0;
r = safe_atou64(p, &serial);
if (r < 0)
return;
if (s->kernel_seqnum) {
/* We already read this one? */
if (serial < *s->kernel_seqnum)
return;
/* Did we lose any? */
if (serial > *s->kernel_seqnum)
server_driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %"PRIu64" kernel messages",
serial - *s->kernel_seqnum - 1);
/* Make sure we never read this one again. Note that
* we always store the next message serial we expect
* here, simply because this makes handling the first
* message with serial 0 easy. */
*s->kernel_seqnum = serial + 1;
}
l -= (e - p) + 1;
p = e + 1;
f = memchr(p, ';', l);
if (!f)
return;
/* Kernel 3.6 has the flags field, kernel 3.5 lacks that */
e = memchr(p, ',', l);
if (!e || f < e)
e = f;
*e = 0;
r = safe_atollu(p, &usec);
if (r < 0)
return;
l -= (f - p) + 1;
p = f + 1;
e = memchr(p, '\n', l);
if (!e)
return;
*e = 0;
pl = e - p;
l -= (e - p) + 1;
k = e + 1;
for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) {
char *m;
/* Meta data fields attached */
if (*k != ' ')
break;
k ++, l --;
e = memchr(k, '\n', l);
if (!e)
return;
*e = 0;
m = cunescape_length_with_prefix(k, e - k, "_KERNEL_");
if (!m)
break;
if (startswith(m, "_KERNEL_DEVICE="))
kernel_device = m + 15;
IOVEC_SET_STRING(iovec[n++], m);
z++;
l -= (e - k) + 1;
k = e + 1;
}
if (kernel_device) {
struct udev_device *ud;
ud = udev_device_new_from_device_id(s->udev, kernel_device);
if (ud) {
const char *g;
struct udev_list_entry *ll;
char *b;
g = udev_device_get_devnode(ud);
if (g) {
b = strappend("_UDEV_DEVNODE=", g);
if (b) {
IOVEC_SET_STRING(iovec[n++], b);
z++;
}
}
g = udev_device_get_sysname(ud);
if (g) {
b = strappend("_UDEV_SYSNAME=", g);
if (b) {
IOVEC_SET_STRING(iovec[n++], b);
z++;
}
}
j = 0;
ll = udev_device_get_devlinks_list_entry(ud);
udev_list_entry_foreach(ll, ll) {
if (j > N_IOVEC_UDEV_FIELDS)
break;
g = udev_list_entry_get_name(ll);
if (g) {
b = strappend("_UDEV_DEVLINK=", g);
if (b) {
IOVEC_SET_STRING(iovec[n++], b);
z++;
}
}
j++;
}
udev_device_unref(ud);
}
}
if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", usec) >= 0)
IOVEC_SET_STRING(iovec[n++], source_time);
IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
IOVEC_SET_STRING(iovec[n++], syslog_priority);
if ((priority & LOG_FACMASK) == LOG_KERN)
IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
else {
pl -= syslog_parse_identifier((const char**) &p, &identifier, &pid);
/* Avoid any messages we generated ourselves via
* log_info() and friends. */
if (pid && is_us(pid))
goto finish;
if (identifier) {
syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
if (syslog_identifier)
IOVEC_SET_STRING(iovec[n++], syslog_identifier);
}
if (pid) {
syslog_pid = strappend("SYSLOG_PID=", pid);
if (syslog_pid)
IOVEC_SET_STRING(iovec[n++], syslog_pid);
}
if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
IOVEC_SET_STRING(iovec[n++], syslog_facility);
}
message = cunescape_length_with_prefix(p, pl, "MESSAGE=");
if (message)
IOVEC_SET_STRING(iovec[n++], message);
server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority, 0);
finish:
for (j = 0; j < z; j++)
free(iovec[j].iov_base);
free(message);
free(syslog_priority);
free(syslog_identifier);
free(syslog_pid);
free(syslog_facility);
free(source_time);
free(identifier);
free(pid);
}
_public_ int sd_journal_sendv(const struct iovec *iov, int n) {
PROTECT_ERRNO;
int fd, r;
_cleanup_close_ int buffer_fd = -1;
struct iovec *w;
uint64_t *l;
int i, j = 0;
static const union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
.un.sun_path = "/run/systemd/journal/socket",
};
struct msghdr mh = {
.msg_name = (struct sockaddr*) &sa.sa,
.msg_namelen = SOCKADDR_UN_LEN(sa.un),
};
ssize_t k;
bool have_syslog_identifier = false;
bool seal = true;
assert_return(iov, -EINVAL);
assert_return(n > 0, -EINVAL);
w = newa(struct iovec, n * 5 + 3);
l = newa(uint64_t, n);
for (i = 0; i < n; i++) {
char *c, *nl;
if (_unlikely_(!iov[i].iov_base || iov[i].iov_len <= 1))
return -EINVAL;
c = memchr(iov[i].iov_base, '=', iov[i].iov_len);
if (_unlikely_(!c || c == iov[i].iov_base))
return -EINVAL;
have_syslog_identifier = have_syslog_identifier ||
(c == (char *) iov[i].iov_base + 17 &&
startswith(iov[i].iov_base, "SYSLOG_IDENTIFIER"));
nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len);
if (nl) {
if (_unlikely_(nl < c))
return -EINVAL;
/* Already includes a newline? Bummer, then
* let's write the variable name, then a
* newline, then the size (64bit LE), followed
* by the data and a final newline */
w[j].iov_base = iov[i].iov_base;
w[j].iov_len = c - (char*) iov[i].iov_base;
j++;
IOVEC_SET_STRING(w[j++], "\n");
l[i] = htole64(iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1);
w[j].iov_base = &l[i];
w[j].iov_len = sizeof(uint64_t);
j++;
w[j].iov_base = c + 1;
w[j].iov_len = iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1;
j++;
} else
/* Nothing special? Then just add the line and
* append a newline */
w[j++] = iov[i];
IOVEC_SET_STRING(w[j++], "\n");
}
if (!have_syslog_identifier &&
string_is_safe(program_invocation_short_name)) {
/* Implicitly add program_invocation_short_name, if it
* is not set explicitly. We only do this for
* program_invocation_short_name, and nothing else
* since everything else is much nicer to retrieve
* from the outside. */
IOVEC_SET_STRING(w[j++], "SYSLOG_IDENTIFIER=");
IOVEC_SET_STRING(w[j++], program_invocation_short_name);
IOVEC_SET_STRING(w[j++], "\n");
}
fd = journal_fd();
if (_unlikely_(fd < 0))
return fd;
mh.msg_iov = w;
mh.msg_iovlen = j;
k = sendmsg(fd, &mh, MSG_NOSIGNAL);
if (k >= 0)
return 0;
/* Fail silently if the journal is not available */
if (errno == ENOENT)
return 0;
if (errno != EMSGSIZE && errno != ENOBUFS)
return -errno;
/* Message doesn't fit... Let's dump the data in a memfd or
* temporary file and just pass a file descriptor of it to the
* other side.
*
* For the temporary files we use /dev/shm instead of /tmp
* here, since we want this to be a tmpfs, and one that is
* available from early boot on and where unprivileged users
* can create files. */
buffer_fd = memfd_new(NULL);
if (buffer_fd < 0) {
if (buffer_fd == -ENOSYS) {
buffer_fd = open_tmpfile_unlinkable("/dev/shm", O_RDWR | O_CLOEXEC);
if (buffer_fd < 0)
return buffer_fd;
seal = false;
} else
return buffer_fd;
}
n = writev(buffer_fd, w, j);
if (n < 0)
return -errno;
if (seal) {
r = memfd_set_sealed(buffer_fd);
if (r < 0)
return r;
}
r = send_one_fd_sa(fd, buffer_fd, mh.msg_name, mh.msg_namelen, 0);
if (r == -ENOENT)
/* Fail silently if the journal is not available */
return 0;
return r;
}
static int fill_iovec_perror_and_send(const char *message, int skip, struct iovec iov[]) {
PROTECT_ERRNO;
size_t n, k;
k = isempty(message) ? 0 : strlen(message) + 2;
n = 8 + k + 256 + 1;
for (;;) {
char buffer[n];
char* j;
errno = 0;
j = strerror_r(_saved_errno_, buffer + 8 + k, n - 8 - k);
if (errno == 0) {
char error[sizeof("ERRNO=")-1 + DECIMAL_STR_MAX(int) + 1];
if (j != buffer + 8 + k)
memmove(buffer + 8 + k, j, strlen(j)+1);
memcpy(buffer, "MESSAGE=", 8);
if (k > 0) {
memcpy(buffer + 8, message, k - 2);
memcpy(buffer + 8 + k - 2, ": ", 2);
}
xsprintf(error, "ERRNO=%i", _saved_errno_);
assert_cc(3 == LOG_ERR);
IOVEC_SET_STRING(iov[skip+0], "PRIORITY=3");
IOVEC_SET_STRING(iov[skip+1], buffer);
IOVEC_SET_STRING(iov[skip+2], error);
return sd_journal_sendv(iov, skip + 3);
}
if (errno != ERANGE)
return -errno;
n *= 2;
}
}
_public_ int sd_journal_perror(const char *message) {
struct iovec iovec[3];
return fill_iovec_perror_and_send(message, 0, iovec);
}
_public_ int sd_journal_stream_fd(const char *identifier, int priority, int level_prefix) {
static const union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
.un.sun_path = "/run/systemd/journal/stdout",
};
_cleanup_close_ int fd = -1;
char *header;
size_t l;
int r;
assert_return(priority >= 0, -EINVAL);
assert_return(priority <= 7, -EINVAL);
fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
if (fd < 0)
return -errno;
r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
if (r < 0)
return -errno;
if (shutdown(fd, SHUT_RD) < 0)
return -errno;
fd_inc_sndbuf(fd, SNDBUF_SIZE);
if (!identifier)
identifier = "";
l = strlen(identifier);
header = alloca(l + 1 + 1 + 2 + 2 + 2 + 2 + 2);
memcpy(header, identifier, l);
header[l++] = '\n';
header[l++] = '\n'; /* unit id */
header[l++] = '0' + priority;
header[l++] = '\n';
header[l++] = '0' + !!level_prefix;
header[l++] = '\n';
header[l++] = '0';
header[l++] = '\n';
header[l++] = '0';
header[l++] = '\n';
header[l++] = '0';
header[l++] = '\n';
r = loop_write(fd, header, l, false);
if (r < 0)
return r;
r = fd;
fd = -1;
return r;
}
_public_ int sd_journal_print_with_location(int priority, const char *file, const char *line, const char *func, const char *format, ...) {
int r;
va_list ap;
va_start(ap, format);
r = sd_journal_printv_with_location(priority, file, line, func, format, ap);
va_end(ap);
return r;
}
_public_ int sd_journal_printv_with_location(int priority, const char *file, const char *line, const char *func, const char *format, va_list ap) {
char buffer[8 + LINE_MAX], p[sizeof("PRIORITY=")-1 + DECIMAL_STR_MAX(int) + 1];
struct iovec iov[5];
char *f;
assert_return(priority >= 0, -EINVAL);
assert_return(priority <= 7, -EINVAL);
assert_return(format, -EINVAL);
xsprintf(p, "PRIORITY=%i", priority & LOG_PRIMASK);
memcpy(buffer, "MESSAGE=", 8);
vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
/* Strip trailing whitespace, keep prefixing whitespace */
(void) strstrip(buffer);
/* Suppress empty lines */
if (isempty(buffer+8))
return 0;
/* func is initialized from __func__ which is not a macro, but
* a static const char[], hence cannot easily be prefixed with
* CODE_FUNC=, hence let's do it manually here. */
ALLOCA_CODE_FUNC(f, func);
zero(iov);
IOVEC_SET_STRING(iov[0], buffer);
IOVEC_SET_STRING(iov[1], p);
IOVEC_SET_STRING(iov[2], file);
IOVEC_SET_STRING(iov[3], line);
IOVEC_SET_STRING(iov[4], f);
return sd_journal_sendv(iov, ELEMENTSOF(iov));
}
void server_forward_console(
Server *s,
int priority,
const char *identifier,
const char *message,
struct ucred *ucred) {
struct iovec iovec[5];
char header_pid[16];
struct timespec ts;
char tbuf[4 + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1];
int n = 0, fd;
char *ident_buf = NULL;
const char *tty;
assert(s);
assert(message);
if (LOG_PRI(priority) > s->max_level_console)
return;
/* First: timestamp */
if (prefix_timestamp()) {
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
snprintf(tbuf, sizeof(tbuf), "[%5llu.%06llu] ",
(unsigned long long) ts.tv_sec,
(unsigned long long) ts.tv_nsec / 1000);
IOVEC_SET_STRING(iovec[n++], tbuf);
}
/* Second: identifier and PID */
if (ucred) {
if (!identifier) {
get_process_comm(ucred->pid, &ident_buf);
identifier = ident_buf;
}
snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
char_array_0(header_pid);
if (identifier)
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], header_pid);
} else if (identifier) {
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], ": ");
}
/* Fourth: message */
IOVEC_SET_STRING(iovec[n++], message);
IOVEC_SET_STRING(iovec[n++], "\n");
tty = s->tty_path ? s->tty_path : "/dev/console";
fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0) {
log_debug("Failed to open %s for logging: %s", tty, strerror(errno));
goto finish;
}
if (writev(fd, iovec, n) < 0)
log_debug("Failed to write to %s for logging: %s", tty, strerror(errno));
safe_close(fd);
finish:
free(ident_buf);
}
void server_forward_console(
Server *s,
int priority,
const char *identifier,
const char *message,
const struct ucred *ucred) {
struct iovec iovec[5];
struct timespec ts;
char tbuf[sizeof("[] ")-1 + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1];
char header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t)];
int n = 0, fd;
_cleanup_free_ char *ident_buf = NULL;
const char *tty;
assert(s);
assert(message);
if (LOG_PRI(priority) > s->max_level_console)
return;
/* First: timestamp */
if (prefix_timestamp()) {
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
xsprintf(tbuf, "[%5"PRI_TIME".%06ld] ",
ts.tv_sec,
ts.tv_nsec / 1000);
IOVEC_SET_STRING(iovec[n++], tbuf);
}
/* Second: identifier and PID */
if (ucred) {
if (!identifier) {
get_process_comm(ucred->pid, &ident_buf);
identifier = ident_buf;
}
xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid);
if (identifier)
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], header_pid);
} else if (identifier) {
IOVEC_SET_STRING(iovec[n++], identifier);
IOVEC_SET_STRING(iovec[n++], ": ");
}
/* Fourth: message */
IOVEC_SET_STRING(iovec[n++], message);
IOVEC_SET_STRING(iovec[n++], "\n");
tty = s->tty_path ? s->tty_path : "/dev/console";
fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0) {
log_debug_errno(errno, "Failed to open %s for logging: %m", tty);
return;
}
if (writev(fd, iovec, n) < 0)
log_debug_errno(errno, "Failed to write to %s for logging: %m", tty);
safe_close(fd);
}
int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
static const char status_indent[] = " "; /* "[" STATUS "] " */
_cleanup_free_ char *s = NULL;
_cleanup_close_ int fd = -1;
struct iovec iovec[6] = {};
int n = 0;
static bool prev_ephemeral;
assert(format);
/* This is independent of logging, as status messages are
* optional and go exclusively to the console. */
if (vasprintf(&s, format, ap) < 0)
return log_oom();
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return fd;
if (ellipse) {
char *e;
size_t emax, sl;
int c;
c = fd_columns(fd);
if (c <= 0)
c = 80;
sl = status ? sizeof(status_indent)-1 : 0;
emax = c - sl - 1;
if (emax < 3)
emax = 3;
e = ellipsize(s, emax, 50);
if (e) {
free(s);
s = e;
}
}
if (prev_ephemeral)
IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
prev_ephemeral = ephemeral;
if (status) {
if (!isempty(status)) {
IOVEC_SET_STRING(iovec[n++], "[");
IOVEC_SET_STRING(iovec[n++], status);
IOVEC_SET_STRING(iovec[n++], "] ");
} else
IOVEC_SET_STRING(iovec[n++], status_indent);
}
IOVEC_SET_STRING(iovec[n++], s);
if (!ephemeral)
IOVEC_SET_STRING(iovec[n++], "\n");
if (writev(fd, iovec, n) < 0)
return -errno;
return 0;
}
void server_process_native_message(
Server *s,
const void *buffer, size_t buffer_size,
const struct ucred *ucred,
const struct timeval *tv,
const char *label, size_t label_len) {
struct iovec *iovec = NULL;
unsigned n = 0, j, tn = (unsigned) -1;
const char *p;
size_t remaining, m = 0, entry_size = 0;
int priority = LOG_INFO;
char *identifier = NULL, *message = NULL;
pid_t object_pid = 0;
assert(s);
assert(buffer || buffer_size == 0);
p = buffer;
remaining = buffer_size;
while (remaining > 0) {
const char *e, *q;
e = memchr(p, '\n', remaining);
if (!e) {
/* Trailing noise, let's ignore it, and flush what we collected */
log_debug("Received message with trailing noise, ignoring.");
break;
}
if (e == p) {
/* Entry separator */
if (entry_size + n + 1 > ENTRY_SIZE_MAX) { /* data + separators + trailer */
log_debug("Entry is too big with %u properties and %zu bytes, ignoring.", n, entry_size);
continue;
}
server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);
n = 0;
priority = LOG_INFO;
entry_size = 0;
p++;
remaining--;
continue;
}
if (*p == '.' || *p == '#') {
/* Ignore control commands for now, and
* comments too. */
remaining -= (e - p) + 1;
p = e + 1;
continue;
}
/* A property follows */
/* n existing properties, 1 new, +1 for _TRANSPORT */
if (!GREEDY_REALLOC(iovec, m, n + 2 + N_IOVEC_META_FIELDS + N_IOVEC_OBJECT_FIELDS)) {
log_oom();
break;
}
q = memchr(p, '=', e - p);
if (q) {
if (valid_user_field(p, q - p, false)) {
size_t l;
l = e - p;
/* If the field name starts with an
* underscore, skip the variable,
* since that indidates a trusted
* field */
iovec[n].iov_base = (char*) p;
iovec[n].iov_len = l;
entry_size += iovec[n].iov_len;
n++;
/* We need to determine the priority
* of this entry for the rate limiting
* logic */
if (l == 10 &&
startswith(p, "PRIORITY=") &&
p[9] >= '0' && p[9] <= '9')
priority = (priority & LOG_FACMASK) | (p[9] - '0');
else if (l == 17 &&
startswith(p, "SYSLOG_FACILITY=") &&
p[16] >= '0' && p[16] <= '9')
priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
else if (l == 18 &&
startswith(p, "SYSLOG_FACILITY=") &&
p[16] >= '0' && p[16] <= '9' &&
p[17] >= '0' && p[17] <= '9')
priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
else if (l >= 19 &&
startswith(p, "SYSLOG_IDENTIFIER=")) {
char *t;
t = strndup(p + 18, l - 18);
if (t) {
free(identifier);
identifier = t;
}
} else if (l >= 8 &&
startswith(p, "MESSAGE=")) {
char *t;
t = strndup(p + 8, l - 8);
if (t) {
free(message);
message = t;
}
} else if (l > strlen("OBJECT_PID=") &&
l < strlen("OBJECT_PID=") + DECIMAL_STR_MAX(pid_t) &&
startswith(p, "OBJECT_PID=") &&
allow_object_pid(ucred)) {
char buf[DECIMAL_STR_MAX(pid_t)];
memcpy(buf, p + strlen("OBJECT_PID="), l - strlen("OBJECT_PID="));
buf[l-strlen("OBJECT_PID=")] = '\0';
/* ignore error */
parse_pid(buf, &object_pid);
}
}
remaining -= (e - p) + 1;
p = e + 1;
continue;
} else {
le64_t l_le;
uint64_t l;
char *k;
if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
log_debug("Failed to parse message, ignoring.");
break;
}
memcpy(&l_le, e + 1, sizeof(uint64_t));
l = le64toh(l_le);
if (l > DATA_SIZE_MAX) {
log_debug("Received binary data block of %"PRIu64" bytes is too large, ignoring.", l);
break;
}
if ((uint64_t) remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
e[1+sizeof(uint64_t)+l] != '\n') {
log_debug("Failed to parse message, ignoring.");
break;
}
k = malloc((e - p) + 1 + l);
if (!k) {
log_oom();
break;
}
memcpy(k, p, e - p);
k[e - p] = '=';
memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
if (valid_user_field(p, e - p, false)) {
iovec[n].iov_base = k;
iovec[n].iov_len = (e - p) + 1 + l;
entry_size += iovec[n].iov_len;
n++;
} else
free(k);
remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
p = e + 1 + sizeof(uint64_t) + l + 1;
}
}
if (n <= 0)
goto finish;
tn = n++;
IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
entry_size += strlen("_TRANSPORT=journal");
if (entry_size + n + 1 > ENTRY_SIZE_MAX) { /* data + separators + trailer */
log_debug("Entry is too big with %u properties and %zu bytes, ignoring.",
n, entry_size);
goto finish;
}
if (message) {
if (s->forward_to_syslog)
server_forward_syslog(s, priority, identifier, message, ucred, tv);
if (s->forward_to_kmsg)
server_forward_kmsg(s, priority, identifier, message, ucred);
if (s->forward_to_console)
server_forward_console(s, priority, identifier, message, ucred);
if (s->forward_to_wall)
server_forward_wall(s, priority, identifier, message, ucred);
}
server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);
finish:
for (j = 0; j < n; j++) {
if (j == tn)
continue;
if (iovec[j].iov_base < buffer ||
(const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
free(iovec[j].iov_base);
}
free(iovec);
free(identifier);
free(message);
}