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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
3b7124a8 LP |
2 | |
3 | #include <fcntl.h> | |
4871690d | 4 | #include <sys/socket.h> |
cf0fbc49 | 5 | #include <time.h> |
3b7124a8 | 6 | |
b5efdb8a | 7 | #include "alloc-util.h" |
6bedfcbb | 8 | #include "fd-util.h" |
ad79565d | 9 | #include "fileio.h" |
f97b34a6 | 10 | #include "format-util.h" |
afc5dbf3 | 11 | #include "io-util.h" |
6bedfcbb LP |
12 | #include "journald-console.h" |
13 | #include "journald-server.h" | |
14 | #include "parse-util.h" | |
0b452006 | 15 | #include "process-util.h" |
15a5e950 | 16 | #include "stdio-util.h" |
288a74cc | 17 | #include "terminal-util.h" |
3b7124a8 | 18 | |
ad79565d UTL |
19 | static bool prefix_timestamp(void) { |
20 | ||
21 | static int cached_printk_time = -1; | |
22 | ||
23 | if (_unlikely_(cached_printk_time < 0)) { | |
24 | _cleanup_free_ char *p = NULL; | |
25 | ||
26 | cached_printk_time = | |
27 | read_one_line_file("/sys/module/printk/parameters/time", &p) >= 0 | |
28 | && parse_boolean(p) > 0; | |
29 | } | |
30 | ||
31 | return cached_printk_time; | |
32 | } | |
33 | ||
3b7124a8 LP |
34 | void server_forward_console( |
35 | Server *s, | |
36 | int priority, | |
37 | const char *identifier, | |
38 | const char *message, | |
3b3154df | 39 | const struct ucred *ucred) { |
3b7124a8 | 40 | |
a4180c0f | 41 | struct iovec iovec[7]; |
ad79565d | 42 | struct timespec ts; |
fbd0b64f LP |
43 | char tbuf[STRLEN("[] ") + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1]; |
44 | char header_pid[STRLEN("[]: ") + DECIMAL_STR_MAX(pid_t)]; | |
fb472900 | 45 | _cleanup_free_ char *ident_buf = NULL; |
254d1313 | 46 | _cleanup_close_ int fd = -EBADF; |
a4180c0f | 47 | const char *tty, *color_on = "", *color_off = ""; |
e6a7ec4b | 48 | int n = 0; |
3b7124a8 LP |
49 | |
50 | assert(s); | |
51 | assert(message); | |
52 | ||
53 | if (LOG_PRI(priority) > s->max_level_console) | |
54 | return; | |
55 | ||
ad79565d UTL |
56 | /* First: timestamp */ |
57 | if (prefix_timestamp()) { | |
58 | assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0); | |
b123d975 | 59 | xsprintf(tbuf, "[%5"PRI_TIME".%06"PRI_NSEC"] ", |
de0671ee | 60 | ts.tv_sec, |
b123d975 | 61 | (nsec_t)ts.tv_nsec / 1000); |
e6a7ec4b LP |
62 | |
63 | iovec[n++] = IOVEC_MAKE_STRING(tbuf); | |
ad79565d UTL |
64 | } |
65 | ||
66 | /* Second: identifier and PID */ | |
3b7124a8 LP |
67 | if (ucred) { |
68 | if (!identifier) { | |
74d6421d | 69 | (void) get_process_comm(ucred->pid, &ident_buf); |
3b7124a8 LP |
70 | identifier = ident_buf; |
71 | } | |
72 | ||
5ffa8c81 | 73 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
3b7124a8 LP |
74 | |
75 | if (identifier) | |
e6a7ec4b | 76 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
3b7124a8 | 77 | |
e6a7ec4b | 78 | iovec[n++] = IOVEC_MAKE_STRING(header_pid); |
3b7124a8 | 79 | } else if (identifier) { |
e6a7ec4b LP |
80 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
81 | iovec[n++] = IOVEC_MAKE_STRING(": "); | |
3b7124a8 LP |
82 | } |
83 | ||
a4180c0f DDM |
84 | get_log_colors(LOG_PRI(priority), &color_on, &color_off, NULL); |
85 | ||
ad79565d | 86 | /* Fourth: message */ |
a4180c0f | 87 | iovec[n++] = IOVEC_MAKE_STRING(color_on); |
e6a7ec4b | 88 | iovec[n++] = IOVEC_MAKE_STRING(message); |
a4180c0f | 89 | iovec[n++] = IOVEC_MAKE_STRING(color_off); |
e6a7ec4b | 90 | iovec[n++] = IOVEC_MAKE_STRING("\n"); |
3b7124a8 | 91 | |
e6a7ec4b | 92 | tty = s->tty_path ?: "/dev/console"; |
3b7124a8 | 93 | |
8ae2c630 LP |
94 | /* Before you ask: yes, on purpose we open/close the console for each log line we write individually. This is a |
95 | * good strategy to avoid journald getting killed by the kernel's SAK concept (it doesn't fix this entirely, | |
96 | * but minimizes the time window the kernel might end up killing journald due to SAK). It also makes things | |
97 | * easier for us so that we don't have to recover from hangups and suchlike triggered on the console. */ | |
98 | ||
3b7124a8 LP |
99 | fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC); |
100 | if (fd < 0) { | |
f9fbac8b | 101 | log_debug_errno(fd, "Failed to open %s for logging: %m", tty); |
fb472900 | 102 | return; |
3b7124a8 LP |
103 | } |
104 | ||
105 | if (writev(fd, iovec, n) < 0) | |
f9fbac8b | 106 | log_debug_errno(errno, "Failed to write to %s for logging: %m", tty); |
3b7124a8 | 107 | } |