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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-journal.h"
#include "alloc-util.h"
#include "build.h"
#include "env-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "main-func.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "syslog-util.h"
#include "terminal-util.h"
static const char *arg_identifier = NULL;
static const char *arg_namespace = NULL;
static int arg_priority = LOG_INFO;
static int arg_stderr_priority = -1;
static bool arg_level_prefix = true;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-cat", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] COMMAND ...\n"
"\n%sExecute process with stdout/stderr connected to the journal.%s\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -t --identifier=STRING Set syslog identifier\n"
" -p --priority=PRIORITY Set priority value (0..7)\n"
" --stderr-priority=PRIORITY Set priority value (0..7) used for stderr\n"
" --level-prefix=BOOL Control whether level prefix shall be parsed\n"
" --namespace=NAMESPACE Connect to specified journal namespace\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_STDERR_PRIORITY,
ARG_LEVEL_PREFIX,
ARG_NAMESPACE,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "identifier", required_argument, NULL, 't' },
{ "priority", required_argument, NULL, 'p' },
{ "stderr-priority", required_argument, NULL, ARG_STDERR_PRIORITY },
{ "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
{ "namespace", required_argument, NULL, ARG_NAMESPACE },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
/* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
* that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
optind = 0;
while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case 't':
arg_identifier = empty_to_null(optarg);
break;
case 'p':
arg_priority = log_level_from_string(optarg);
if (arg_priority < 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse priority value.");
break;
case ARG_STDERR_PRIORITY:
arg_stderr_priority = log_level_from_string(optarg);
if (arg_stderr_priority < 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse stderr priority value.");
break;
case ARG_LEVEL_PREFIX:
r = parse_boolean_argument("--level-prefix=", optarg, &arg_level_prefix);
if (r < 0)
return r;
break;
case ARG_NAMESPACE:
arg_namespace = empty_to_null(optarg);
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_close_ int outfd = -EBADF, errfd = -EBADF, saved_stderr = -EBADF;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
outfd = sd_journal_stream_fd_with_namespace(arg_namespace, arg_identifier, arg_priority, arg_level_prefix);
if (outfd < 0)
return log_error_errno(outfd, "Failed to create stream fd: %m");
if (arg_stderr_priority >= 0 && arg_stderr_priority != arg_priority) {
errfd = sd_journal_stream_fd_with_namespace(arg_namespace, arg_identifier, arg_stderr_priority, arg_level_prefix);
if (errfd < 0)
return log_error_errno(errfd, "Failed to create stream fd: %m");
}
saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
r = rearrange_stdio(STDIN_FILENO, outfd, errfd < 0 ? outfd : errfd); /* Invalidates fd on success + error! */
TAKE_FD(outfd);
TAKE_FD(errfd);
if (r < 0)
return log_error_errno(r, "Failed to rearrange stdout/stderr: %m");
if (argc <= optind)
(void) execl("/bin/cat", "/bin/cat", NULL);
else {
struct stat st;
if (fstat(STDERR_FILENO, &st) < 0)
return log_error_errno(errno,
"Failed to fstat(%s): %m",
FORMAT_PROC_FD_PATH(STDERR_FILENO));
r = setenvf("JOURNAL_STREAM", /* overwrite = */ true, DEV_FMT ":" INO_FMT, (dev_t) st.st_dev, st.st_ino);
if (r < 0)
return log_error_errno(r, "Failed to set environment variable JOURNAL_STREAM: %m");
(void) execvp(argv[optind], argv + optind);
}
r = -errno;
/* Let's try to restore a working stderr, so we can print the error message */
if (saved_stderr >= 0)
(void) dup3(saved_stderr, STDERR_FILENO, 0);
return log_error_errno(r, "Failed to execute process: %m");
}
DEFINE_MAIN_FUNCTION(run);
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