#include <fcntl.h>

#include <errno.h>

#include <stddef.h>

#include <string.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <sys/poll.h>

#include <time.h>

#include <getopt.h>

#include <sys/stat.h>

#include <systemd/sd-journal.h>

#include "log.h"

#include "util.h"

#include "path-util.h"

#include "build.h"

#include "pager.h"

#include "logs-show.h"

#include "strv.h"

#include "journal-internal.h"

static OutputMode arg_output = OUTPUT_SHORT;

static bool arg_follow = false;

static bool arg_show_all = false;

static bool arg_no_pager = false;

static int arg_lines = -1;

static bool arg_no_tail = false;

static bool arg_new_id128 = false;

static bool arg_print_header = false;

static bool arg_quiet = false;

static bool arg_local = false;

static bool arg_this_boot = false;

static const char *arg_directory = NULL;

static int help(void) {

printf("%s [OPTIONS...] [MATCH]\n\n"

"Send control commands to or query the journal.\n\n"

" -h --help Show this help\n"

" --version Show package version\n"

" --no-pager Do not pipe output into a pager\n"

" -a --all Show all fields, including long and unprintable\n"

" -f --follow Follow journal\n"

" -n --lines=INTEGER Journal entries to show\n"

" --no-tail Show all lines, even in follow mode\n"

" -o --output=STRING Change journal output mode (short, short-monotonic,\n"

" verbose, export, json, cat)\n"

" -q --quiet Don't show privilege warning\n"

" -l --local Only local entries\n"

" -b --this-boot Show data only from current boot\n"

" -D --directory=PATH Show journal files from directory\n"

" --header Show journal header information\n"

" --new-id128 Generate a new 128 Bit id\n",

program_invocation_short_name);

return 0;

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_VERSION = 0x100,

ARG_NO_PAGER,

ARG_NO_TAIL,

ARG_NEW_ID128,

ARG_HEADER

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version" , no_argument, NULL, ARG_VERSION },

{ "no-pager", no_argument, NULL, ARG_NO_PAGER },

{ "follow", no_argument, NULL, 'f' },

{ "output", required_argument, NULL, 'o' },

{ "all", no_argument, NULL, 'a' },

{ "lines", required_argument, NULL, 'n' },

{ "no-tail", no_argument, NULL, ARG_NO_TAIL },

{ "new-id128", no_argument, NULL, ARG_NEW_ID128 },

{ "quiet", no_argument, NULL, 'q' },

{ "local", no_argument, NULL, 'l' },

{ "this-boot", no_argument, NULL, 'b' },

{ "directory", required_argument, NULL, 'D' },

{ "header", no_argument, NULL, ARG_HEADER },

{ NULL, 0, NULL, 0 }

};

int c, r;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "hfo:an:qlbD:", options, NULL)) >= 0) {

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(DISTRIBUTION);

puts(SYSTEMD_FEATURES);

return 0;

case ARG_NO_PAGER:

arg_no_pager = true;

break;

case 'f':

arg_follow = true;

break;

case 'o':

arg_output = output_mode_from_string(optarg);

if (arg_output < 0) {

log_error("Unknown output '%s'.", optarg);

return -EINVAL;

}

break;

case 'a':

arg_show_all = true;

break;

case 'n':

r = safe_atoi(optarg, &arg_lines);

if (r < 0 || arg_lines < 0) {

log_error("Failed to parse lines '%s'", optarg);

return -EINVAL;

}

break;

case ARG_NO_TAIL:

arg_no_tail = true;

break;

case ARG_NEW_ID128:

arg_new_id128 = true;

break;

case 'q':

arg_quiet = true;

break;

case 'l':

arg_local = true;

break;

case 'b':

arg_this_boot = true;

break;

case 'D':

arg_directory = optarg;

break;

case ARG_HEADER:

arg_print_header = true;

break;

case '?':

return -EINVAL;

default:

log_error("Unknown option code %c", c);

return -EINVAL;

}

}

if (arg_follow && !arg_no_tail && arg_lines < 0)

arg_lines = 10;

return 1;

}

static bool on_tty(void) {

static int t = -1;

/* Note that this is invoked relatively early, before we start

if (_unlikely_(t < 0))

t = isatty(STDOUT_FILENO) > 0;

return t;

}

static int generate_new_id128(void) {

sd_id128_t id;

int r;

unsigned i;

r = sd_id128_randomize(&id);

if (r < 0) {

log_error("Failed to generate ID: %s", strerror(-r));

return r;

}

printf("As string:\n"

SD_ID128_FORMAT_STR "\n\n"

"As UUID:\n"

"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"

"As macro:\n"

"#define MESSAGE_XYZ SD_ID128_MAKE(",

SD_ID128_FORMAT_VAL(id),

SD_ID128_FORMAT_VAL(id));

for (i = 0; i < 16; i++)

printf("%02x%s", id.bytes[i], i != 15 ? "," : "");

fputs(")\n", stdout);

return 0;

}

static int add_matches(sd_journal *j, char **args) {

char **i;

int r;

assert(j);

STRV_FOREACH(i, args) {

if (streq(*i, "+"))

r = sd_journal_add_disjunction(j);

else if (path_is_absolute(*i)) {

char *p;

const char *path;

struct stat st;

p = canonicalize_file_name(*i);

path = p ? p : *i;

if (stat(path, &st) < 0) {

free(p);

log_error("Couldn't stat file: %m");

return -errno;

}

if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {

char *t;

t = strappend("_EXE=", path);

if (!t) {

free(p);

return log_oom();

}

r = sd_journal_add_match(j, t, 0);

free(t);

} else {

free(p);

log_error("File is not a regular file or is not executable: %s", *i);

return -EINVAL;

}

free(p);

} else

r = sd_journal_add_match(j, *i, 0);

if (r < 0) {

log_error("Failed to add match '%s': %s", *i, strerror(-r));

return r;

}

}

return 0;

}

static int add_this_boot(sd_journal *j) {

char match[9+32+1] = "_BOOT_ID=";

sd_id128_t boot_id;

int r;

if (!arg_this_boot)

return 0;

r = sd_id128_get_boot(&boot_id);

if (r < 0) {

log_error("Failed to get boot id: %s", strerror(-r));

return r;

}

sd_id128_to_string(boot_id, match + 9);

r = sd_journal_add_match(j, match, strlen(match));

if (r < 0) {

log_error("Failed to add match: %s", strerror(-r));

return r;

}

return 0;

}

int main(int argc, char *argv[]) {

int r;

sd_journal *j = NULL;

unsigned line = 0;

bool need_seek = false;

sd_id128_t previous_boot_id;

bool previous_boot_id_valid = false;

bool have_pager;

log_parse_environment();

log_open();

r = parse_argv(argc, argv);

if (r <= 0)

goto finish;

if (arg_new_id128) {

r = generate_new_id128();

goto finish;

}

#ifdef HAVE_ACL

if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)

log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");

#endif

if (arg_directory)

r = sd_journal_open_directory(&j, arg_directory, 0);

else

r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);

if (r < 0) {

log_error("Failed to open journal: %s", strerror(-r));

goto finish;

}

if (arg_print_header) {

journal_print_header(j);

r = 0;

goto finish;

}

r = add_this_boot(j);

if (r < 0)

goto finish;

r = add_matches(j, argv + optind);

if (r < 0)

goto finish;

if (!arg_quiet) {

usec_t start, end;

char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX];

r = sd_journal_get_cutoff_realtime_usec(j, &start, &end);

if (r < 0) {

log_error("Failed to get cutoff: %s", strerror(-r));

goto finish;

}

if (r > 0) {

if (arg_follow)

printf("Logs begin at %s.\n", format_timestamp(start_buf, sizeof(start_buf), start));

else

printf("Logs begin at %s, end at %s.\n",

format_timestamp(start_buf, sizeof(start_buf), start),

format_timestamp(end_buf, sizeof(end_buf), end));

}

}

if (arg_lines >= 0) {

r = sd_journal_seek_tail(j);

if (r < 0) {

log_error("Failed to seek to tail: %s", strerror(-r));

goto finish;

}

r = sd_journal_previous_skip(j, arg_lines);

} else {

r = sd_journal_seek_head(j);

if (r < 0) {

log_error("Failed to seek to head: %s", strerror(-r));

goto finish;

}

r = sd_journal_next(j);

}

if (r < 0) {

log_error("Failed to iterate through journal: %s", strerror(-r));

goto finish;

}

on_tty();

have_pager = !arg_no_pager && !arg_follow && pager_open();

if (arg_output == OUTPUT_JSON) {

fputc('[', stdout);

fflush(stdout);

}

for (;;) {

for (;;) {

sd_id128_t boot_id;

int flags =

arg_show_all * OUTPUT_SHOW_ALL |

have_pager * OUTPUT_FULL_WIDTH |

on_tty() * OUTPUT_COLOR;

if (need_seek) {

r = sd_journal_next(j);

if (r < 0) {

log_error("Failed to iterate through journal: %s", strerror(-r));

goto finish;

}

}

if (r == 0)

break;

r = sd_journal_get_monotonic_usec(j, NULL, &boot_id);

if (r >= 0) {

if (previous_boot_id_valid &&

!sd_id128_equal(boot_id, previous_boot_id))

printf(ANSI_HIGHLIGHT_ON "----- Reboot -----" ANSI_HIGHLIGHT_OFF "\n");

previous_boot_id = boot_id;

previous_boot_id_valid = true;

}

line ++;

r = output_journal(j, arg_output, line, 0, flags);

if (r < 0)

goto finish;

need_seek = true;

}

if (!arg_follow)

break;

r = sd_journal_wait(j, (uint64_t) -1);

if (r < 0) {

log_error("Couldn't wait for log event: %s", strerror(-r));

goto finish;

}

}

if (arg_output == OUTPUT_JSON)

fputs("\n]\n", stdout);

finish:

if (j)

sd_journal_close(j);

pager_close();

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}