logs-show.c revision 86aa7ba4f9969bbfc75ebd51f944313695f1a0a1
/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <time.h>
#include <assert.h>
#include <errno.h>
#include "logs-show.h"
#include "log.h"
#include "util.h"
#define PRINT_THRESHOLD 128
static bool contains_unprintable(const void *p, size_t l) {
const char *j;
for (j = p; j < (const char *) p + l; j++)
if (*j < ' ' || *j >= 127)
return true;
return false;
}
static int output_short(sd_journal *j, unsigned line, bool show_all) {
int r;
uint64_t realtime;
time_t t;
struct tm tm;
char buf[64];
const void *data;
size_t length;
size_t n = 0;
assert(j);
r = sd_journal_get_realtime_usec(j, &realtime);
if (r < 0) {
log_error("Failed to get realtime: %s", strerror(-r));
return r;
}
t = (time_t) (realtime / USEC_PER_SEC);
if (strftime(buf, sizeof(buf), "%b %d %H:%M:%S", localtime_r(&t, &tm)) <= 0) {
log_error("Failed to format time.");
return -EINVAL;
}
fputs(buf, stdout);
n += strlen(buf);
if (sd_journal_get_data(j, "_HOSTNAME", &data, &length) >= 0 &&
(show_all || (!contains_unprintable(data, length) &&
length < PRINT_THRESHOLD))) {
printf(" %.*s", (int) length - 10, ((const char*) data) + 10);
n += length - 10 + 1;
}
if (sd_journal_get_data(j, "MESSAGE", &data, &length) >= 0) {
if (show_all)
printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
else if (contains_unprintable(data, length))
fputs(" [blob data]", stdout);
else if (length - 8 + n < columns())
printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
else if (n < columns()) {
char *e;
e = ellipsize_mem((const char *) data + 8, length - 8, columns() - n - 2, 90);
if (!e)
printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
else
printf(" %s", e);
free(e);
}
}
fputc('\n', stdout);
return 0;
}
static int output_verbose(sd_journal *j, unsigned line, 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 ||
contains_unprintable(data, length))) {
const char *c;
c = memchr(data, '=', length);
if (!c) {
log_error("Invalid field.");
return -EINVAL;
}
printf("\t%.*s=[blob data]\n",
(int) (c - (const char*) data),
(const char*) data);
} else
printf("\t%.*s\n", (int) length, (const char*) data);
}
return 0;
}
static int output_export(sd_journal *j, unsigned line, 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=%llu\n"
".monotonic=%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) {
if (contains_unprintable(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 (contains_unprintable(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, 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\" : %llu,\n"
"\t\".monotonic\" : %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;
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_funcs[_OUTPUT_MODE_MAX])(sd_journal*j, unsigned line, bool show_all) = {
[OUTPUT_SHORT] = output_short,
[OUTPUT_VERBOSE] = output_verbose,
[OUTPUT_EXPORT] = output_export,
[OUTPUT_JSON] = output_json
};
int output_journal(sd_journal *j, output_mode mode, unsigned line, bool show_all) {
assert(mode < _OUTPUT_MODE_MAX);
return output_funcs[mode](j, line, show_all);
}
int show_journal_by_service(
const char *service,
output_mode mode,
const char *prefix,
unsigned n_columns,
usec_t not_before,
unsigned how_many,
bool show_all) {
char *m = NULL;
sd_journal *j;
int r;
unsigned i;
assert(service);
if (n_columns <= 0)
n_columns = columns();
if (how_many <= 0)
how_many = 10;
if (!prefix)
prefix = "";
if (asprintf(&m, "_SYSTEMD_SERVICE=%s", service) < 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;
for (i = 0; i < how_many; i++)
sd_journal_previous(j);
for (i = 0; i < how_many; i++) {
r = sd_journal_next(j);
if (r < 0)
goto finish;
if (r == 0)
break;
r = output_journal(j, mode, i+1, show_all);
if (r < 0)
goto finish;
}
finish:
if (m)
free(m);
if (j)
sd_journal_close(j);
return r;
}