464 lines
15 KiB
C
464 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/poll.h>
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#include <time.h>
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#include <getopt.h>
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#include <sys/stat.h>
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#include <systemd/sd-journal.h>
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#include "log.h"
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#include "util.h"
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#include "path-util.h"
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#include "build.h"
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#include "pager.h"
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#include "logs-show.h"
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#include "strv.h"
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#include "journal-internal.h"
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static OutputMode arg_output = OUTPUT_SHORT;
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static bool arg_follow = false;
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static bool arg_show_all = false;
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static bool arg_no_pager = false;
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static int arg_lines = -1;
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static bool arg_no_tail = false;
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static bool arg_new_id128 = false;
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static bool arg_print_header = false;
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static bool arg_quiet = false;
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static bool arg_local = false;
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static bool arg_this_boot = false;
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static const char *arg_directory = NULL;
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static int help(void) {
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printf("%s [OPTIONS...] [MATCH]\n\n"
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"Send control commands to or query the journal.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --no-pager Do not pipe output into a pager\n"
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" -a --all Show all fields, including long and unprintable\n"
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" -f --follow Follow journal\n"
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" -n --lines=INTEGER Journal entries to show\n"
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" --no-tail Show all lines, even in follow mode\n"
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" -o --output=STRING Change journal output mode (short, short-monotonic,\n"
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" verbose, export, json, cat)\n"
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" -q --quiet Don't show privilege warning\n"
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" -l --local Only local entries\n"
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" -b --this-boot Show data only from current boot\n"
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" -D --directory=PATH Show journal files from directory\n"
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" --header Show journal header information\n"
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" --new-id128 Generate a new 128 Bit id\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_NO_PAGER,
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ARG_NO_TAIL,
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ARG_NEW_ID128,
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ARG_HEADER
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version" , no_argument, NULL, ARG_VERSION },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{ "follow", no_argument, NULL, 'f' },
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{ "output", required_argument, NULL, 'o' },
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{ "all", no_argument, NULL, 'a' },
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{ "lines", required_argument, NULL, 'n' },
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{ "no-tail", no_argument, NULL, ARG_NO_TAIL },
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{ "new-id128", no_argument, NULL, ARG_NEW_ID128 },
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{ "quiet", no_argument, NULL, 'q' },
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{ "local", no_argument, NULL, 'l' },
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{ "this-boot", no_argument, NULL, 'b' },
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{ "directory", required_argument, NULL, 'D' },
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{ "header", no_argument, NULL, ARG_HEADER },
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{ NULL, 0, NULL, 0 }
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hfo:an:qlbD:", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(DISTRIBUTION);
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puts(SYSTEMD_FEATURES);
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return 0;
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case ARG_NO_PAGER:
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arg_no_pager = true;
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break;
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case 'f':
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arg_follow = true;
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break;
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case 'o':
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arg_output = output_mode_from_string(optarg);
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if (arg_output < 0) {
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log_error("Unknown output '%s'.", optarg);
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return -EINVAL;
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}
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break;
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case 'a':
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arg_show_all = true;
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break;
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case 'n':
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r = safe_atoi(optarg, &arg_lines);
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if (r < 0 || arg_lines < 0) {
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log_error("Failed to parse lines '%s'", optarg);
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return -EINVAL;
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}
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break;
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case ARG_NO_TAIL:
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arg_no_tail = true;
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break;
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case ARG_NEW_ID128:
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arg_new_id128 = true;
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break;
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case 'q':
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arg_quiet = true;
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break;
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case 'l':
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arg_local = true;
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break;
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case 'b':
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arg_this_boot = true;
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break;
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case 'D':
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arg_directory = optarg;
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break;
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case ARG_HEADER:
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arg_print_header = true;
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break;
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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if (arg_follow && !arg_no_tail && arg_lines < 0)
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arg_lines = 10;
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return 1;
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}
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static int generate_new_id128(void) {
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sd_id128_t id;
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int r;
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unsigned i;
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r = sd_id128_randomize(&id);
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if (r < 0) {
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log_error("Failed to generate ID: %s", strerror(-r));
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return r;
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}
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printf("As string:\n"
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SD_ID128_FORMAT_STR "\n\n"
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"As UUID:\n"
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"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
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"As macro:\n"
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"#define MESSAGE_XYZ SD_ID128_MAKE(",
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SD_ID128_FORMAT_VAL(id),
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SD_ID128_FORMAT_VAL(id));
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for (i = 0; i < 16; i++)
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printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
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fputs(")\n", stdout);
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return 0;
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}
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static int add_matches(sd_journal *j, char **args) {
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char **i;
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int r;
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assert(j);
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STRV_FOREACH(i, args) {
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if (streq(*i, "+"))
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r = sd_journal_add_disjunction(j);
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else if (path_is_absolute(*i)) {
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char *p;
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const char *path;
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struct stat st;
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p = canonicalize_file_name(*i);
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path = p ? p : *i;
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if (stat(path, &st) < 0) {
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free(p);
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log_error("Couldn't stat file: %m");
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return -errno;
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}
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if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {
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char *t;
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t = strappend("_EXE=", path);
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if (!t) {
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free(p);
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return log_oom();
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}
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r = sd_journal_add_match(j, t, 0);
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free(t);
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} else {
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free(p);
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log_error("File is not a regular file or is not executable: %s", *i);
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return -EINVAL;
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}
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free(p);
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} else
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r = sd_journal_add_match(j, *i, 0);
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if (r < 0) {
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log_error("Failed to add match '%s': %s", *i, strerror(-r));
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return r;
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}
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}
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return 0;
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}
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static int add_this_boot(sd_journal *j) {
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char match[9+32+1] = "_BOOT_ID=";
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sd_id128_t boot_id;
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int r;
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if (!arg_this_boot)
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return 0;
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r = sd_id128_get_boot(&boot_id);
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if (r < 0) {
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log_error("Failed to get boot id: %s", strerror(-r));
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return r;
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}
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sd_id128_to_string(boot_id, match + 9);
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r = sd_journal_add_match(j, match, strlen(match));
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if (r < 0) {
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log_error("Failed to add match: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r;
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sd_journal *j = NULL;
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unsigned line = 0;
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bool need_seek = false;
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sd_id128_t previous_boot_id;
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bool previous_boot_id_valid = false;
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bool have_pager;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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if (arg_new_id128) {
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r = generate_new_id128();
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goto finish;
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}
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#ifdef HAVE_ACL
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if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)
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log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
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#endif
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if (arg_directory)
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r = sd_journal_open_directory(&j, arg_directory, 0);
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else
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r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);
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if (r < 0) {
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log_error("Failed to open journal: %s", strerror(-r));
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goto finish;
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}
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if (arg_print_header) {
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journal_print_header(j);
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r = 0;
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goto finish;
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}
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r = add_this_boot(j);
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if (r < 0)
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goto finish;
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r = add_matches(j, argv + optind);
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if (r < 0)
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goto finish;
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if (!arg_quiet) {
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usec_t start, end;
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char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX];
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r = sd_journal_get_cutoff_realtime_usec(j, &start, &end);
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if (r < 0) {
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log_error("Failed to get cutoff: %s", strerror(-r));
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goto finish;
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}
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if (r > 0) {
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if (arg_follow)
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printf("Logs begin at %s.\n", format_timestamp(start_buf, sizeof(start_buf), start));
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else
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printf("Logs begin at %s, end at %s.\n",
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format_timestamp(start_buf, sizeof(start_buf), start),
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format_timestamp(end_buf, sizeof(end_buf), end));
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}
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}
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if (arg_lines >= 0) {
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r = sd_journal_seek_tail(j);
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if (r < 0) {
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log_error("Failed to seek to tail: %s", strerror(-r));
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goto finish;
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}
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r = sd_journal_previous_skip(j, arg_lines);
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} else {
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r = sd_journal_seek_head(j);
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if (r < 0) {
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log_error("Failed to seek to head: %s", strerror(-r));
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goto finish;
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}
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r = sd_journal_next(j);
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}
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if (r < 0) {
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log_error("Failed to iterate through journal: %s", strerror(-r));
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goto finish;
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}
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have_pager = !arg_no_pager && !arg_follow && pager_open();
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if (arg_output == OUTPUT_JSON) {
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fputc('[', stdout);
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fflush(stdout);
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}
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for (;;) {
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for (;;) {
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sd_id128_t boot_id;
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int flags = (arg_show_all*OUTPUT_SHOW_ALL |
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have_pager*OUTPUT_FULL_WIDTH);
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if (need_seek) {
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r = sd_journal_next(j);
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if (r < 0) {
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log_error("Failed to iterate through journal: %s", strerror(-r));
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goto finish;
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}
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}
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if (r == 0)
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break;
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r = sd_journal_get_monotonic_usec(j, NULL, &boot_id);
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if (r >= 0) {
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if (previous_boot_id_valid &&
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!sd_id128_equal(boot_id, previous_boot_id))
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printf(ANSI_HIGHLIGHT_ON "----- Reboot -----" ANSI_HIGHLIGHT_OFF "\n");
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previous_boot_id = boot_id;
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previous_boot_id_valid = true;
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}
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line ++;
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r = output_journal(j, arg_output, line, 0, flags);
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if (r < 0)
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goto finish;
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need_seek = true;
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}
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if (!arg_follow)
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break;
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r = sd_journal_wait(j, (uint64_t) -1);
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if (r < 0) {
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log_error("Couldn't wait for log event: %s", strerror(-r));
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goto finish;
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}
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}
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if (arg_output == OUTPUT_JSON)
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fputs("\n]\n", stdout);
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finish:
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if (j)
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sd_journal_close(j);
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pager_close();
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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