[thirdparty/systemd.git] / src / logs-show.c

/*-*- 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 <sys/poll.h>
#include <string.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 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 (contains_unprintable(p, l))
                return false;

        return true;
}

static int output_short(sd_journal *j, unsigned line, 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;
        }

        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 (contains_unprintable(message, message_len))
                fputs(": [blob data]\n", stdout);
        else if (message_len + n < columns())
                printf(": %.*s\n", (int) message_len, message);
        else if (n < columns()) {
                char *e;

                e = ellipsize_mem(message, message_len, 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, bool show_all) {
        return output_short(j, line, show_all, false);
}

static int output_short_monotonic(sd_journal *j, unsigned line, bool show_all) {
        return output_short(j, line, show_all, true);
}

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_realtime,
        [OUTPUT_SHORT_MONOTONIC] = output_short_monotonic,
        [OUTPUT_VERBOSE] = output_verbose,
        [OUTPUT_EXPORT] = output_export,
        [OUTPUT_JSON] = output_json
};

int output_journal(sd_journal *j, OutputMode mode, unsigned line, bool show_all) {
        assert(mode >= 0);
        assert(mode < _OUTPUT_MODE_MAX);

        return output_funcs[mode](j, line, show_all);
}

int show_journal_by_unit(
                const char *unit,
                OutputMode mode,
                const char *prefix,
                unsigned n_columns,
                usec_t not_before,
                unsigned how_many,
                bool show_all,
                bool follow) {

        char *m = NULL;
        sd_journal *j;
        int r;
        int fd;
        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 (n_columns <= 0)
                n_columns = columns();

        if (!prefix)
                prefix = "";

        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;

        fd = sd_journal_get_fd(j);
        if (fd < 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, show_all);
                        if (r < 0)
                                goto finish;
                }

                if (!follow)
                        break;

                r = fd_wait_for_event(fd, POLLIN);
                if (r < 0)
                        goto finish;

                r = sd_journal_process(j);
                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"
};

DEFINE_STRING_TABLE_LOOKUP(output_mode, OutputMode);
Commit	Line	Data
86aa7ba4 LP	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2012 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
	22	#include <time.h>
	23	#include <assert.h>
	24	#include <errno.h>
df50185b	25	#include <sys/poll.h>
55d7bfc1	26	#include <string.h>
86aa7ba4 LP	27
	28	#include "logs-show.h"
	29	#include "log.h"
	30	#include "util.h"
	31
	32	#define PRINT_THRESHOLD 128
	33
	34	static bool contains_unprintable(const void *p, size_t l) {
	35	const char *j;
	36
	37	for (j = p; j < (const char *) p + l; j++)
	38	if (j < ' ' \|\| j >= 127)
	39	return true;
	40
	41	return false;
	42	}
	43
55d7bfc1 LP	44	static int parse_field(const void data, size_t length, const char field, char *target, size_t target_size) {
	45	size_t fl, nl;
	46	void *buf;
	47
	48	assert(data);
	49	assert(field);
	50	assert(target);
	51	assert(target_size);
	52
	53	fl = strlen(field);
	54	if (length < fl)
	55	return 0;
	56
	57	if (memcmp(data, field, fl))
	58	return 0;
	59
	60	nl = length - fl;
bf967366 LP	61	buf = malloc(nl+1);
	62	memcpy(buf, (const char*) data + fl, nl);
	63	((char*)buf)[nl] = 0;
55d7bfc1 LP	64	if (!buf) {
	65	log_error("Out of memory");
	66	return -ENOMEM;
	67	}
	68
6c1e6b98	69	free(*target);
55d7bfc1 LP	70	*target = buf;
	71	*target_size = nl;
	72
	73	return 1;
	74	}
	75
	76	static bool shall_print(bool show_all, char *p, size_t l) {
	77	if (show_all)
	78	return true;
	79
	80	if (l > PRINT_THRESHOLD)
	81	return false;
	82
	83	if (contains_unprintable(p, l))
	84	return false;
	85
	86	return true;
	87	}
	88
bf967366	89	static int output_short(sd_journal *j, unsigned line, bool show_all, bool monotonic_mode) {
86aa7ba4	90	int r;
86aa7ba4 LP	91	const void *data;
	92	size_t length;
	93	size_t n = 0;
bf967366 LP	94	char hostname = NULL, identifier = NULL, comm = NULL, pid = NULL, fake_pid = NULL, message = NULL, realtime = NULL, monotonic = NULL;
bf967366 LP	95	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;
86aa7ba4 LP	96
	97	assert(j);
	98
55d7bfc1 LP	99	SD_JOURNAL_FOREACH_DATA(j, data, length) {
	100
	101	r = parse_field(data, length, "_HOSTNAME=", &hostname, &hostname_len);
	102	if (r < 0)
	103	goto finish;
	104	else if (r > 0)
	105	continue;
	106
4cd9a9d9	107	r = parse_field(data, length, "SYSLOG_IDENTIFIER=", &identifier, &identifier_len);
55d7bfc1 LP	108	if (r < 0)
	109	goto finish;
	110	else if (r > 0)
	111	continue;
	112
	113	r = parse_field(data, length, "_COMM=", &comm, &comm_len);
	114	if (r < 0)
	115	goto finish;
	116	else if (r > 0)
	117	continue;
	118
	119	r = parse_field(data, length, "_PID=", &pid, &pid_len);
	120	if (r < 0)
	121	goto finish;
	122	else if (r > 0)
	123	continue;
	124
6c1e6b98 LP	125	r = parse_field(data, length, "SYSLOG_PID=", &fake_pid, &fake_pid_len);
	126	if (r < 0)
	127	goto finish;
	128	else if (r > 0)
	129	continue;
	130
bf967366 LP	131	r = parse_field(data, length, "_SOURCE_REALTIME_TIMESTAMP=", &realtime, &realtime_len);
	132	if (r < 0)
	133	goto finish;
	134	else if (r > 0)
	135	continue;
	136
	137	r = parse_field(data, length, "_SOURCE_MONOTONIC_TIMESTAMP=", &monotonic, &monotonic_len);
	138	if (r < 0)
	139	goto finish;
	140	else if (r > 0)
	141	continue;
	142
55d7bfc1 LP	143	r = parse_field(data, length, "MESSAGE=", &message, &message_len);
	144	if (r < 0)
	145	goto finish;
	146	}
	147
	148	if (!message) {
	149	r = 0;
	150	goto finish;
	151	}
	152
bf967366	153	if (monotonic_mode) {
67a12205	154	uint64_t t;
3ebcdf8c LP	155	sd_id128_t boot_id;
3ebcdf8c LP	156
bf967366 LP	157	r = -ENOENT;
	158
	159	if (monotonic)
	160	r = safe_atou64(monotonic, &t);
	161
	162	if (r < 0)
3ebcdf8c	163	r = sd_journal_get_monotonic_usec(j, &t, &boot_id);
86aa7ba4	164
3ebcdf8c LP	165	if (r < 0) {
	166	log_error("Failed to get monotonic: %s", strerror(-r));
	167	goto finish;
67a12205 LP	168	}
67a12205 LP	169
3ebcdf8c LP	170	printf("[%5llu.%06llu]",
	171	(unsigned long long) (t / USEC_PER_SEC),
	172	(unsigned long long) (t % USEC_PER_SEC));
	173
	174	n += 1 + 5 + 1 + 6 + 1;
	175
67a12205 LP	176	} else {
67a12205 LP	177	char buf[64];
bf967366	178	uint64_t x;
67a12205 LP	179	time_t t;
67a12205 LP	180	struct tm tm;
731a676c	181
bf967366 LP	182	r = -ENOENT;
	183
	184	if (realtime)
	185	r = safe_atou64(realtime, &x);
	186
	187	if (r < 0)
	188	r = sd_journal_get_realtime_usec(j, &x);
67a12205	189
67a12205 LP	190	if (r < 0) {
	191	log_error("Failed to get realtime: %s", strerror(-r));
	192	goto finish;
	193	}
	194
bf967366	195	t = (time_t) (x / USEC_PER_SEC);
67a12205 LP	196	if (strftime(buf, sizeof(buf), "%b %d %H:%M:%S", localtime_r(&t, &tm)) <= 0) {
	197	log_error("Failed to format time.");
	198	goto finish;
	199	}
	200
	201	fputs(buf, stdout);
	202	n += strlen(buf);
	203	}
86aa7ba4	204
55d7bfc1 LP	205	if (hostname && shall_print(show_all, hostname, hostname_len)) {
	206	printf(" %.*s", (int) hostname_len, hostname);
	207	n += hostname_len + 1;
	208	}
	209
4cd9a9d9 LP	210	if (identifier && shall_print(show_all, identifier, identifier_len)) {
	211	printf(" %.*s", (int) identifier_len, identifier);
	212	n += identifier_len + 1;
55d7bfc1 LP	213	} else if (comm && shall_print(show_all, comm, comm_len)) {
	214	printf(" %.*s", (int) comm_len, comm);
	215	n += comm_len + 1;
86aa7ba4 LP	216	}
86aa7ba4 LP	217
55d7bfc1 LP	218	if (pid && shall_print(show_all, pid, pid_len)) {
	219	printf("[%.*s]", (int) pid_len, pid);
	220	n += pid_len + 2;
6c1e6b98 LP	221	} else if (fake_pid && shall_print(show_all, fake_pid, fake_pid_len)) {
	222	printf("[%.*s]", (int) fake_pid_len, fake_pid);
	223	n += fake_pid_len + 2;
86aa7ba4 LP	224	}
86aa7ba4 LP	225
55d7bfc1 LP	226	if (show_all)
	227	printf(": %.*s\n", (int) message_len, message);
	228	else if (contains_unprintable(message, message_len))
	229	fputs(": [blob data]\n", stdout);
	230	else if (message_len + n < columns())
	231	printf(": %.*s\n", (int) message_len, message);
	232	else if (n < columns()) {
	233	char *e;
	234
	235	e = ellipsize_mem(message, message_len, columns() - n - 2, 90);
	236
	237	if (!e)
	238	printf(": %.*s\n", (int) message_len, message);
	239	else
52beb2c3	240	printf(": %s\n", e);
55d7bfc1 LP	241
	242	free(e);
	243	} else
	244	fputs("\n", stdout);
	245
	246	r = 0;
	247
	248	finish:
	249	free(hostname);
4cd9a9d9	250	free(identifier);
55d7bfc1 LP	251	free(comm);
55d7bfc1 LP	252	free(pid);
6c1e6b98	253	free(fake_pid);
55d7bfc1	254	free(message);
bf967366 LP	255	free(monotonic);
bf967366 LP	256	free(realtime);
86aa7ba4	257
55d7bfc1	258	return r;
86aa7ba4 LP	259	}
86aa7ba4 LP	260
67a12205 LP	261	static int output_short_realtime(sd_journal *j, unsigned line, bool show_all) {
	262	return output_short(j, line, show_all, false);
	263	}
	264
	265	static int output_short_monotonic(sd_journal *j, unsigned line, bool show_all) {
	266	return output_short(j, line, show_all, true);
	267	}
	268
86aa7ba4 LP	269	static int output_verbose(sd_journal *j, unsigned line, bool show_all) {
	270	const void *data;
	271	size_t length;
	272	char *cursor;
	273	uint64_t realtime;
	274	char ts[FORMAT_TIMESTAMP_MAX];
	275	int r;
	276
	277	assert(j);
	278
	279	r = sd_journal_get_realtime_usec(j, &realtime);
	280	if (r < 0) {
	281	log_error("Failed to get realtime timestamp: %s", strerror(-r));
	282	return r;
	283	}
	284
	285	r = sd_journal_get_cursor(j, &cursor);
	286	if (r < 0) {
	287	log_error("Failed to get cursor: %s", strerror(-r));
	288	return r;
	289	}
	290
	291	printf("%s [%s]\n",
	292	format_timestamp(ts, sizeof(ts), realtime),
	293	cursor);
	294
	295	free(cursor);
	296
	297	SD_JOURNAL_FOREACH_DATA(j, data, length) {
	298	if (!show_all && (length > PRINT_THRESHOLD \|\|
	299	contains_unprintable(data, length))) {
	300	const char *c;
	301
	302	c = memchr(data, '=', length);
	303	if (!c) {
	304	log_error("Invalid field.");
	305	return -EINVAL;
	306	}
	307
	308	printf("\t%.*s=[blob data]\n",
	309	(int) (c - (const char*) data),
	310	(const char*) data);
	311	} else
	312	printf("\t%.s\n", (int) length, (const char) data);
	313	}
	314
	315	return 0;
	316	}
	317
	318	static int output_export(sd_journal *j, unsigned line, bool show_all) {
	319	sd_id128_t boot_id;
	320	char sid[33];
	321	int r;
	322	usec_t realtime, monotonic;
	323	char *cursor;
	324	const void *data;
	325	size_t length;
	326
	327	assert(j);
	328
	329	r = sd_journal_get_realtime_usec(j, &realtime);
	330	if (r < 0) {
	331	log_error("Failed to get realtime timestamp: %s", strerror(-r));
	332	return r;
333	}
334
335	r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
336	if (r < 0) {
337	log_error("Failed to get monotonic timestamp: %s", strerror(-r));
338	return r;
339	}
340
341	r = sd_journal_get_cursor(j, &cursor);
342	if (r < 0) {
343	log_error("Failed to get cursor: %s", strerror(-r));
344	return r;
345	}
346
347	printf(".cursor=%s\n"
348	".realtime=%llu\n"
349	".monotonic=%llu\n"
350	".boot_id=%s\n",
351	cursor,
352	(unsigned long long) realtime,
353	(unsigned long long) monotonic,
354	sd_id128_to_string(boot_id, sid));
355
356	free(cursor);
357
358	SD_JOURNAL_FOREACH_DATA(j, data, length) {
359
360	if (contains_unprintable(data, length)) {
361	const char *c;
362	uint64_t le64;
363
364	c = memchr(data, '=', length);
365	if (!c) {
366	log_error("Invalid field.");
367	return -EINVAL;
368	}
369
370	fwrite(data, c - (const char*) data, 1, stdout);
371	fputc('\n', stdout);
372	le64 = htole64(length - (c - (const char*) data) - 1);
373	fwrite(&le64, sizeof(le64), 1, stdout);
374	fwrite(c + 1, length - (c - (const char*) data) - 1, 1, stdout);
375	} else
376	fwrite(data, length, 1, stdout);
377
378	fputc('\n', stdout);
379	}
380
381	fputc('\n', stdout);
382
383	return 0;
384	}
385
386	static void json_escape(const char* p, size_t l) {
387
388	if (contains_unprintable(p, l)) {
389	bool not_first = false;
390
391	fputs("[ ", stdout);
392
393	while (l > 0) {
394	if (not_first)
395	printf(", %u", (uint8_t) *p);
396	else {
397	not_first = true;
398	printf("%u", (uint8_t) *p);
399	}
400
401	p++;
402	l--;
403	}
404
405	fputs(" ]", stdout);
406	} else {
407	fputc('\"', stdout);
408
409	while (l > 0) {
410	if (p == '"' \|\| p == '\\') {
411	fputc('\\', stdout);
412	fputc(*p, stdout);
413	} else
414	fputc(*p, stdout);
415
416	p++;
417	l--;
418	}
419
420	fputc('\"', stdout);
421	}
422	}
423
424	static int output_json(sd_journal *j, unsigned line, bool show_all) {
425	uint64_t realtime, monotonic;
426	char *cursor;
427	const void *data;
428	size_t length;
429	sd_id128_t boot_id;
430	char sid[33];
431	int r;
432
433	assert(j);
434
435	r = sd_journal_get_realtime_usec(j, &realtime);
436	if (r < 0) {
437	log_error("Failed to get realtime timestamp: %s", strerror(-r));
438	return r;
439	}
440
441	r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
442	if (r < 0) {
443	log_error("Failed to get monotonic timestamp: %s", strerror(-r));
444	return r;
445	}
446
447	r = sd_journal_get_cursor(j, &cursor);
448	if (r < 0) {
449	log_error("Failed to get cursor: %s", strerror(-r));
450	return r;
451	}
452
453	if (line == 1)
454	fputc('\n', stdout);
455	else
456	fputs(",\n", stdout);
457
458	printf("{\n"
459	"\t\".cursor\" : \"%s\",\n"
460	"\t\".realtime\" : %llu,\n"
461	"\t\".monotonic\" : %llu,\n"
462	"\t\".boot_id\" : \"%s\"",
463	cursor,
464	(unsigned long long) realtime,
465	(unsigned long long) monotonic,
466	sd_id128_to_string(boot_id, sid));
467
468	free(cursor);
469
470	SD_JOURNAL_FOREACH_DATA(j, data, length) {
471	const char *c;
472
473	c = memchr(data, '=', length);
474	if (!c) {
475	log_error("Invalid field.");
476	return -EINVAL;
477	}
478
479	fputs(",\n\t", stdout);
480	json_escape(data, c - (const char*) data);
481	fputs(" : ", stdout);
482	json_escape(c + 1, length - (c - (const char*) data) - 1);
483	}
484
485	fputs("\n}", stdout);
486	fflush(stdout);
487
488	return 0;
489	}
490
491	static int (output_funcs[_OUTPUT_MODE_MAX])(sd_journalj, unsigned line, bool show_all) = {
67a12205 LP	492	[OUTPUT_SHORT] = output_short_realtime,
67a12205 LP	493	[OUTPUT_SHORT_MONOTONIC] = output_short_monotonic,
86aa7ba4 LP	494	[OUTPUT_VERBOSE] = output_verbose,
	495	[OUTPUT_EXPORT] = output_export,
	496	[OUTPUT_JSON] = output_json
	497	};
	498
df50185b LP	499	int output_journal(sd_journal *j, OutputMode mode, unsigned line, bool show_all) {
df50185b LP	500	assert(mode >= 0);
86aa7ba4 LP	501	assert(mode < _OUTPUT_MODE_MAX);
	502
	503	return output_funcs[mode](j, line, show_all);
	504	}
	505
df50185b LP	506	int show_journal_by_unit(
	507	const char *unit,
	508	OutputMode mode,
86aa7ba4 LP	509	const char *prefix,
	510	unsigned n_columns,
	511	usec_t not_before,
	512	unsigned how_many,
df50185b LP	513	bool show_all,
df50185b LP	514	bool follow) {
86aa7ba4 LP	515
	516	char *m = NULL;
	517	sd_journal *j;
	518	int r;
df50185b LP	519	int fd;
	520	unsigned line = 0;
	521	bool need_seek = false;
86aa7ba4	522
df50185b LP	523	assert(mode >= 0);
	524	assert(mode < _OUTPUT_MODE_MAX);
	525	assert(unit);
	526
	527	if (!endswith(unit, ".service") &&
	528	!endswith(unit, ".socket") &&
	529	!endswith(unit, ".mount") &&
	530	!endswith(unit, ".swap"))
	531	return 0;
86aa7ba4	532
df50185b	533	if (how_many <= 0)
f4fb21c1 LP	534	return 0;
f4fb21c1 LP	535
86aa7ba4 LP	536	if (n_columns <= 0)
	537	n_columns = columns();
	538
86aa7ba4 LP	539	if (!prefix)
	540	prefix = "";
	541
df50185b	542	if (asprintf(&m, "_SYSTEMD_UNIT=%s", unit) < 0) {
86aa7ba4 LP	543	r = -ENOMEM;
	544	goto finish;
	545	}
	546
	547	r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY\|SD_JOURNAL_SYSTEM_ONLY);
	548	if (r < 0)
	549	goto finish;
	550
df50185b LP	551	fd = sd_journal_get_fd(j);
	552	if (fd < 0)
	553	goto finish;
	554
86aa7ba4 LP	555	r = sd_journal_add_match(j, m, strlen(m));
	556	if (r < 0)
	557	goto finish;
	558
	559	r = sd_journal_seek_tail(j);
	560	if (r < 0)
	561	goto finish;
	562
df50185b LP	563	r = sd_journal_previous_skip(j, how_many);
	564	if (r < 0)
	565	goto finish;
86aa7ba4	566
df50185b LP	567	if (mode == OUTPUT_JSON) {
	568	fputc('[', stdout);
	569	fflush(stdout);
	570	}
86aa7ba4	571
df50185b LP	572	for (;;) {
	573	for (;;) {
	574	usec_t usec;
	575
	576	if (need_seek) {
	577	r = sd_journal_next(j);
	578	if (r < 0)
	579	goto finish;
	580	}
	581
	582	if (r == 0)
	583	break;
86aa7ba4	584
df50185b LP	585	need_seek = true;
	586
	587	if (not_before > 0) {
	588	r = sd_journal_get_monotonic_usec(j, &usec, NULL);
	589
	590	/* -ESTALE is returned if the
	591	timestamp is not from this boot */
	592	if (r == -ESTALE)
	593	continue;
	594	else if (r < 0)
	595	goto finish;
	596
	597	if (usec < not_before)
	598	continue;
	599	}
	600
	601	line ++;
	602
	603	r = output_journal(j, mode, line, show_all);
	604	if (r < 0)
	605	goto finish;
	606	}
	607
	608	if (!follow)
86aa7ba4 LP	609	break;
86aa7ba4 LP	610
df50185b	611	r = fd_wait_for_event(fd, POLLIN);
86aa7ba4 LP	612	if (r < 0)
86aa7ba4 LP	613	goto finish;
df50185b LP	614
	615	r = sd_journal_process(j);
	616	if (r < 0)
	617	goto finish;
	618
86aa7ba4 LP	619	}
86aa7ba4 LP	620
df50185b LP	621	if (mode == OUTPUT_JSON)
	622	fputs("\n]\n", stdout);
	623
86aa7ba4 LP	624	finish:
	625	if (m)
	626	free(m);
	627
	628	if (j)
	629	sd_journal_close(j);
	630
	631	return r;
	632	}
df50185b LP	633
	634	static const char *const output_mode_table[_OUTPUT_MODE_MAX] = {
	635	[OUTPUT_SHORT] = "short",
67a12205	636	[OUTPUT_SHORT_MONOTONIC] = "short-monotonic",
df50185b LP	637	[OUTPUT_VERBOSE] = "verbose",
	638	[OUTPUT_EXPORT] = "export",
	639	[OUTPUT_JSON] = "json"
	640	};
	641
	642	DEFINE_STRING_TABLE_LOOKUP(output_mode, OutputMode);