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-rw-r--r--src/basic/log.c1138
1 files changed, 1138 insertions, 0 deletions
diff --git a/src/basic/log.c b/src/basic/log.c
new file mode 100644
index 0000000000..b96afc4de4
--- /dev/null
+++ b/src/basic/log.c
@@ -0,0 +1,1138 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stddef.h>
+#include <printf.h>
+
+#include "sd-messages.h"
+#include "log.h"
+#include "util.h"
+#include "missing.h"
+#include "macro.h"
+#include "socket-util.h"
+#include "formats-util.h"
+#include "process-util.h"
+#include "terminal-util.h"
+#include "signal-util.h"
+
+#define SNDBUF_SIZE (8*1024*1024)
+
+static LogTarget log_target = LOG_TARGET_CONSOLE;
+static int log_max_level = LOG_INFO;
+static int log_facility = LOG_DAEMON;
+
+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;
+
+static bool show_color = false;
+static bool show_location = false;
+
+static bool upgrade_syslog_to_journal = false;
+
+/* Akin to glibc's __abort_msg; which is private and we hence cannot
+ * use here. */
+static char *log_abort_msg = NULL;
+
+void log_close_console(void) {
+
+ if (console_fd < 0)
+ return;
+
+ if (getpid() == 1) {
+ if (console_fd >= 3)
+ safe_close(console_fd);
+
+ console_fd = -1;
+ }
+}
+
+static int log_open_console(void) {
+
+ if (console_fd >= 0)
+ return 0;
+
+ if (getpid() == 1) {
+ console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+ if (console_fd < 0)
+ return console_fd;
+ } else
+ console_fd = STDERR_FILENO;
+
+ return 0;
+}
+
+void log_close_kmsg(void) {
+ kmsg_fd = safe_close(kmsg_fd);
+}
+
+static int log_open_kmsg(void) {
+
+ if (kmsg_fd >= 0)
+ return 0;
+
+ kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+ if (kmsg_fd < 0)
+ return -errno;
+
+ return 0;
+}
+
+void log_close_syslog(void) {
+ syslog_fd = safe_close(syslog_fd);
+}
+
+static int create_log_socket(int type) {
+ struct timeval tv;
+ int fd;
+
+ fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0);
+ if (fd < 0)
+ return -errno;
+
+ fd_inc_sndbuf(fd, SNDBUF_SIZE);
+
+ /* We need a blocking fd here since we'd otherwise lose
+ messages way too early. However, let's not hang forever in the
+ unlikely case of a deadlock. */
+ if (getpid() == 1)
+ timeval_store(&tv, 10 * USEC_PER_MSEC);
+ else
+ timeval_store(&tv, 10 * USEC_PER_SEC);
+ (void) setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+
+ return fd;
+}
+
+static int log_open_syslog(void) {
+
+ static const union sockaddr_union sa = {
+ .un.sun_family = AF_UNIX,
+ .un.sun_path = "/dev/log",
+ };
+
+ int r;
+
+ if (syslog_fd >= 0)
+ return 0;
+
+ syslog_fd = create_log_socket(SOCK_DGRAM);
+ if (syslog_fd < 0) {
+ r = syslog_fd;
+ goto fail;
+ }
+
+ if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
+ safe_close(syslog_fd);
+
+ /* Some legacy syslog systems still use stream
+ * sockets. They really shouldn't. But what can we
+ * do... */
+ syslog_fd = create_log_socket(SOCK_STREAM);
+ if (syslog_fd < 0) {
+ r = syslog_fd;
+ goto fail;
+ }
+
+ 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
+ * killed by SAK. If we don't use syslog we close it here so
+ * that we are not confused by somebody deleting the socket in
+ * the fs. If we don't use /dev/kmsg we still keep it open,
+ * 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;
+ }
+
+ 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
+ * 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;
+}
+
+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, *b;
+ size_t l;
+
+ 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;
+
+ /* Prepend the object name before the message */
+ if (object) {
+ size_t n;
+
+ n = strlen(object);
+ l = n + 2 + LINE_MAX;
+
+ buffer = newa(char, l);
+ b = stpcpy(stpcpy(buffer, object), ": ");
+ } else {
+ l = LINE_MAX;
+ b = buffer = newa(char, l);
+ }
+
+ vsnprintf(b, l, 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,
+ * since vasprintf() leaves it afterwards at
+ * an undefined location */
+
+ 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
+ * the next format string */
+ 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) {
+
+ /*
+ * The systemd.log_xyz= settings are parsed by all tools, and
+ * so is "debug".
+ *
+ * However, "quiet" is only parsed by PID 1, and only turns of
+ * status output to /dev/console, but does not alter the log
+ * level.
+ */
+
+ 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.
+ We assume that anything that has a controlling
+ tty is user stuff. */
+ (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;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-15 04:30:31 +0000