/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 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 .
***/
#include
#include
#include
#include
#include
#include "logs-show.h"
#include "log.h"
#include "util.h"
#include "utf8.h"
#define PRINT_THRESHOLD 128
static int parse_field(const void *data, size_t length, const char *field, char **target, size_t *target_size) {
size_t fl, nl;
void *buf;
assert(data);
assert(field);
assert(target);
assert(target_size);
fl = strlen(field);
if (length < fl)
return 0;
if (memcmp(data, field, fl))
return 0;
nl = length - fl;
buf = malloc(nl+1);
memcpy(buf, (const char*) data + fl, nl);
((char*)buf)[nl] = 0;
if (!buf) {
log_error("Out of memory");
return -ENOMEM;
}
free(*target);
*target = buf;
*target_size = nl;
return 1;
}
static bool shall_print(bool show_all, char *p, size_t l) {
if (show_all)
return true;
if (l > PRINT_THRESHOLD)
return false;
if (!utf8_is_printable_n(p, l))
return false;
return true;
}
static int output_short(sd_journal *j, unsigned line, unsigned n_columns, bool show_all, bool monotonic_mode) {
int r;
const void *data;
size_t length;
size_t n = 0;
char *hostname = NULL, *identifier = NULL, *comm = NULL, *pid = NULL, *fake_pid = NULL, *message = NULL, *realtime = NULL, *monotonic = NULL;
size_t hostname_len = 0, identifier_len = 0, comm_len = 0, pid_len = 0, fake_pid_len = 0, message_len = 0, realtime_len = 0, monotonic_len = 0;
assert(j);
SD_JOURNAL_FOREACH_DATA(j, data, length) {
r = parse_field(data, length, "_HOSTNAME=", &hostname, &hostname_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "SYSLOG_IDENTIFIER=", &identifier, &identifier_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "_COMM=", &comm, &comm_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "_PID=", &pid, &pid_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "SYSLOG_PID=", &fake_pid, &fake_pid_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "_SOURCE_REALTIME_TIMESTAMP=", &realtime, &realtime_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "_SOURCE_MONOTONIC_TIMESTAMP=", &monotonic, &monotonic_len);
if (r < 0)
goto finish;
else if (r > 0)
continue;
r = parse_field(data, length, "MESSAGE=", &message, &message_len);
if (r < 0)
goto finish;
}
if (!message) {
r = 0;
goto finish;
}
if (monotonic_mode) {
uint64_t t;
sd_id128_t boot_id;
r = -ENOENT;
if (monotonic)
r = safe_atou64(monotonic, &t);
if (r < 0)
r = sd_journal_get_monotonic_usec(j, &t, &boot_id);
if (r < 0) {
log_error("Failed to get monotonic: %s", strerror(-r));
goto finish;
}
printf("[%5llu.%06llu]",
(unsigned long long) (t / USEC_PER_SEC),
(unsigned long long) (t % USEC_PER_SEC));
n += 1 + 5 + 1 + 6 + 1;
} else {
char buf[64];
uint64_t x;
time_t t;
struct tm tm;
r = -ENOENT;
if (realtime)
r = safe_atou64(realtime, &x);
if (r < 0)
r = sd_journal_get_realtime_usec(j, &x);
if (r < 0) {
log_error("Failed to get realtime: %s", strerror(-r));
goto finish;
}
t = (time_t) (x / USEC_PER_SEC);
if (strftime(buf, sizeof(buf), "%b %d %H:%M:%S", localtime_r(&t, &tm)) <= 0) {
log_error("Failed to format time.");
goto finish;
}
fputs(buf, stdout);
n += strlen(buf);
}
if (hostname && shall_print(show_all, hostname, hostname_len)) {
printf(" %.*s", (int) hostname_len, hostname);
n += hostname_len + 1;
}
if (identifier && shall_print(show_all, identifier, identifier_len)) {
printf(" %.*s", (int) identifier_len, identifier);
n += identifier_len + 1;
} else if (comm && shall_print(show_all, comm, comm_len)) {
printf(" %.*s", (int) comm_len, comm);
n += comm_len + 1;
} else
putchar(' ');
if (pid && shall_print(show_all, pid, pid_len)) {
printf("[%.*s]", (int) pid_len, pid);
n += pid_len + 2;
} else if (fake_pid && shall_print(show_all, fake_pid, fake_pid_len)) {
printf("[%.*s]", (int) fake_pid_len, fake_pid);
n += fake_pid_len + 2;
}
if (show_all)
printf(": %.*s\n", (int) message_len, message);
else if (!utf8_is_printable_n(message, message_len)) {
char bytes[FORMAT_BYTES_MAX];
printf(": [%s blob data]\n", format_bytes(bytes, sizeof(bytes), message_len));
} else if (message_len + n < n_columns)
printf(": %.*s\n", (int) message_len, message);
else if (n < n_columns) {
char *e;
e = ellipsize_mem(message, message_len, n_columns - n - 2, 90);
if (!e)
printf(": %.*s\n", (int) message_len, message);
else
printf(": %s\n", e);
free(e);
} else
fputs("\n", stdout);
r = 0;
finish:
free(hostname);
free(identifier);
free(comm);
free(pid);
free(fake_pid);
free(message);
free(monotonic);
free(realtime);
return r;
}
static int output_short_realtime(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
return output_short(j, line, n_columns, show_all, false);
}
static int output_short_monotonic(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
return output_short(j, line, n_columns, show_all, true);
}
static int output_verbose(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
const void *data;
size_t length;
char *cursor;
uint64_t realtime;
char ts[FORMAT_TIMESTAMP_MAX];
int r;
assert(j);
r = sd_journal_get_realtime_usec(j, &realtime);
if (r < 0) {
log_error("Failed to get realtime timestamp: %s", strerror(-r));
return r;
}
r = sd_journal_get_cursor(j, &cursor);
if (r < 0) {
log_error("Failed to get cursor: %s", strerror(-r));
return r;
}
printf("%s [%s]\n",
format_timestamp(ts, sizeof(ts), realtime),
cursor);
free(cursor);
SD_JOURNAL_FOREACH_DATA(j, data, length) {
if (!show_all && (length > PRINT_THRESHOLD ||
!utf8_is_printable_n(data, length))) {
const char *c;
char bytes[FORMAT_BYTES_MAX];
c = memchr(data, '=', length);
if (!c) {
log_error("Invalid field.");
return -EINVAL;
}
printf("\t%.*s=[%s blob data]\n",
(int) (c - (const char*) data),
(const char*) data,
format_bytes(bytes, sizeof(bytes), length - (c - (const char *) data) - 1));
} else
printf("\t%.*s\n", (int) length, (const char*) data);
}
return 0;
}
static int output_export(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
sd_id128_t boot_id;
char sid[33];
int r;
usec_t realtime, monotonic;
char *cursor;
const void *data;
size_t length;
assert(j);
r = sd_journal_get_realtime_usec(j, &realtime);
if (r < 0) {
log_error("Failed to get realtime timestamp: %s", strerror(-r));
return r;
}
r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
if (r < 0) {
log_error("Failed to get monotonic timestamp: %s", strerror(-r));
return r;
}
r = sd_journal_get_cursor(j, &cursor);
if (r < 0) {
log_error("Failed to get cursor: %s", strerror(-r));
return r;
}
printf("__CURSOR=%s\n"
"__REALTIME_TIMESTAMP=%llu\n"
"__MONOTONIC_TIMESTAMP=%llu\n"
"_BOOT_ID=%s\n",
cursor,
(unsigned long long) realtime,
(unsigned long long) monotonic,
sd_id128_to_string(boot_id, sid));
free(cursor);
SD_JOURNAL_FOREACH_DATA(j, data, length) {
/* We already printed the boot id, from the data in
* the header, hence let's suppress it here */
if (length >= 9 &&
memcmp(data, "_BOOT_ID=", 9) == 0)
continue;
if (!utf8_is_printable_n(data, length)) {
const char *c;
uint64_t le64;
c = memchr(data, '=', length);
if (!c) {
log_error("Invalid field.");
return -EINVAL;
}
fwrite(data, c - (const char*) data, 1, stdout);
fputc('\n', stdout);
le64 = htole64(length - (c - (const char*) data) - 1);
fwrite(&le64, sizeof(le64), 1, stdout);
fwrite(c + 1, length - (c - (const char*) data) - 1, 1, stdout);
} else
fwrite(data, length, 1, stdout);
fputc('\n', stdout);
}
fputc('\n', stdout);
return 0;
}
static void json_escape(const char* p, size_t l) {
if (!utf8_is_printable_n(p, l)) {
bool not_first = false;
fputs("[ ", stdout);
while (l > 0) {
if (not_first)
printf(", %u", (uint8_t) *p);
else {
not_first = true;
printf("%u", (uint8_t) *p);
}
p++;
l--;
}
fputs(" ]", stdout);
} else {
fputc('\"', stdout);
while (l > 0) {
if (*p == '"' || *p == '\\') {
fputc('\\', stdout);
fputc(*p, stdout);
} else
fputc(*p, stdout);
p++;
l--;
}
fputc('\"', stdout);
}
}
static int output_json(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
uint64_t realtime, monotonic;
char *cursor;
const void *data;
size_t length;
sd_id128_t boot_id;
char sid[33];
int r;
assert(j);
r = sd_journal_get_realtime_usec(j, &realtime);
if (r < 0) {
log_error("Failed to get realtime timestamp: %s", strerror(-r));
return r;
}
r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
if (r < 0) {
log_error("Failed to get monotonic timestamp: %s", strerror(-r));
return r;
}
r = sd_journal_get_cursor(j, &cursor);
if (r < 0) {
log_error("Failed to get cursor: %s", strerror(-r));
return r;
}
if (line == 1)
fputc('\n', stdout);
else
fputs(",\n", stdout);
printf("{\n"
"\t\"__CURSOR\" : \"%s\",\n"
"\t\"__REALTIME_TIMESTAMP\" : \"%llu\",\n"
"\t\"__MONOTONIC_TIMESTAMP\" : \"%llu\",\n"
"\t\"_BOOT_ID\" : \"%s\"",
cursor,
(unsigned long long) realtime,
(unsigned long long) monotonic,
sd_id128_to_string(boot_id, sid));
free(cursor);
SD_JOURNAL_FOREACH_DATA(j, data, length) {
const char *c;
/* We already printed the boot id, from the data in
* the header, hence let's suppress it here */
if (length >= 9 &&
memcmp(data, "_BOOT_ID=", 9) == 0)
continue;
c = memchr(data, '=', length);
if (!c) {
log_error("Invalid field.");
return -EINVAL;
}
fputs(",\n\t", stdout);
json_escape(data, c - (const char*) data);
fputs(" : ", stdout);
json_escape(c + 1, length - (c - (const char*) data) - 1);
}
fputs("\n}", stdout);
fflush(stdout);
return 0;
}
static int output_cat(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
const void *data;
size_t l;
int r;
assert(j);
r = sd_journal_get_data(j, "MESSAGE", &data, &l);
if (r < 0) {
log_error("Failed to get data: %s", strerror(-r));
return r;
}
assert(l >= 8);
fwrite((const char*) data + 8, 1, l - 8, stdout);
putchar('\n');
return 0;
}
static int (*output_funcs[_OUTPUT_MODE_MAX])(sd_journal*j, unsigned line, unsigned n_columns, bool show_all) = {
[OUTPUT_SHORT] = output_short_realtime,
[OUTPUT_SHORT_MONOTONIC] = output_short_monotonic,
[OUTPUT_VERBOSE] = output_verbose,
[OUTPUT_EXPORT] = output_export,
[OUTPUT_JSON] = output_json,
[OUTPUT_CAT] = output_cat
};
int output_journal(sd_journal *j, OutputMode mode, unsigned line, unsigned n_columns, bool show_all) {
assert(mode >= 0);
assert(mode < _OUTPUT_MODE_MAX);
if (n_columns <= 0)
n_columns = columns();
return output_funcs[mode](j, line, n_columns, show_all);
}
int show_journal_by_unit(
const char *unit,
OutputMode mode,
unsigned n_columns,
usec_t not_before,
unsigned how_many,
bool show_all,
bool follow,
bool warn_cutoff) {
char *m = NULL;
sd_journal *j = NULL;
int r;
unsigned line = 0;
bool need_seek = false;
assert(mode >= 0);
assert(mode < _OUTPUT_MODE_MAX);
assert(unit);
if (!endswith(unit, ".service") &&
!endswith(unit, ".socket") &&
!endswith(unit, ".mount") &&
!endswith(unit, ".swap"))
return 0;
if (how_many <= 0)
return 0;
if (asprintf(&m, "_SYSTEMD_UNIT=%s", unit) < 0) {
r = -ENOMEM;
goto finish;
}
r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM_ONLY);
if (r < 0)
goto finish;
r = sd_journal_add_match(j, m, strlen(m));
if (r < 0)
goto finish;
r = sd_journal_seek_tail(j);
if (r < 0)
goto finish;
r = sd_journal_previous_skip(j, how_many);
if (r < 0)
goto finish;
if (mode == OUTPUT_JSON) {
fputc('[', stdout);
fflush(stdout);
}
for (;;) {
for (;;) {
usec_t usec;
if (need_seek) {
r = sd_journal_next(j);
if (r < 0)
goto finish;
}
if (r == 0)
break;
need_seek = true;
if (not_before > 0) {
r = sd_journal_get_monotonic_usec(j, &usec, NULL);
/* -ESTALE is returned if the
timestamp is not from this boot */
if (r == -ESTALE)
continue;
else if (r < 0)
goto finish;
if (usec < not_before)
continue;
}
line ++;
r = output_journal(j, mode, line, n_columns, show_all);
if (r < 0)
goto finish;
}
if (warn_cutoff && line < how_many && not_before > 0) {
sd_id128_t boot_id;
usec_t cutoff;
/* Check whether the cutoff line is too early */
r = sd_id128_get_boot(&boot_id);
if (r < 0)
goto finish;
r = sd_journal_get_cutoff_monotonic_usec(j, boot_id, &cutoff, NULL);
if (r < 0)
goto finish;
if (not_before < cutoff)
printf("Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.\n");
warn_cutoff = false;
}
if (!follow)
break;
r = sd_journal_wait(j, (usec_t) -1);
if (r < 0)
goto finish;
}
if (mode == OUTPUT_JSON)
fputs("\n]\n", stdout);
finish:
if (m)
free(m);
if (j)
sd_journal_close(j);
return r;
}
static const char *const output_mode_table[_OUTPUT_MODE_MAX] = {
[OUTPUT_SHORT] = "short",
[OUTPUT_SHORT_MONOTONIC] = "short-monotonic",
[OUTPUT_VERBOSE] = "verbose",
[OUTPUT_EXPORT] = "export",
[OUTPUT_JSON] = "json",
[OUTPUT_CAT] = "cat"
};
DEFINE_STRING_TABLE_LOOKUP(output_mode, OutputMode);