/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 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
#include
#include
#include
#include
#include
#include
#include "log.h"
#include "util.h"
#include "path-util.h"
#include "build.h"
#include "pager.h"
#include "logs-show.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_quiet = false;
static bool arg_local = false;
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"
" --new-id128 Generate a new 128 Bit id\n"
" -l --local Only local entries\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
};
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' },
{ NULL, 0, NULL, 0 }
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hfo:an:ql", 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 '?':
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 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;
}
int main(int argc, char *argv[]) {
int r, i, fd;
sd_journal *j = NULL;
unsigned line = 0;
bool need_seek = false;
struct stat st;
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
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;
}
for (i = optind; i < argc; i++) {
if (path_is_absolute(argv[i])) {
char *p = NULL;
const char *path;
p = canonicalize_file_name(argv[i]);
path = p ? p : argv[i];
if (stat(path, &st) < 0) {
free(p);
log_error("Couldn't stat file: %m");
r = -errno;
goto finish;
}
if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {
char *t;
t = strappend("_EXE=", path);
if (!t) {
free(p);
log_error("Out of memory");
goto finish;
}
r = sd_journal_add_match(j, t, strlen(t));
free(t);
} else {
free(p);
log_error("File is not a regular file or is not executable: %s", argv[i]);
goto finish;
}
free(p);
} else
r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
if (r < 0) {
log_error("Failed to add match: %s", strerror(-r));
goto finish;
}
}
fd = sd_journal_get_fd(j);
if (fd < 0) {
log_error("Failed to get wakeup fd: %s", strerror(-fd));
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;
}
if (!arg_no_pager && !arg_follow) {
columns();
pager_open();
}
if (arg_output == OUTPUT_JSON) {
fputc('[', stdout);
fflush(stdout);
}
for (;;) {
for (;;) {
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;
line ++;
r = output_journal(j, arg_output, line, 0, arg_show_all);
if (r < 0)
goto finish;
need_seek = true;
}
if (!arg_follow)
break;
r = fd_wait_for_event(fd, POLLIN, (usec_t) -1);
if (r < 0) {
log_error("Couldn't wait for event: %s", strerror(-r));
goto finish;
}
r = sd_journal_process(j);
if (r < 0) {
log_error("Failed to process: %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;
}