#include <stdio.h>

#include <getopt.h>

#include <assert.h>

#include <unistd.h>

#include <stdlib.h>

#include <errno.h>

#include <fcntl.h>

#include "systemd/sd-journal.h"

#include "util.h"

#include "build.h"

static char *arg_identifier = NULL;

static int arg_priority = LOG_INFO;

static bool arg_level_prefix = true;

static int help(void) {

printf("%s [OPTIONS...] {COMMAND} ...\n\n"

"Execute process with stdout/stderr connected to the journal.\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"

" --level-prefix=BOOL Control whether level prefix shall be parsed\n",

program_invocation_short_name);

return 0;

}

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

enum {

ARG_VERSION = 0x100,

ARG_LEVEL_PREFIX

};

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' },

{ "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },

{}

};

int c;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) {

switch (c) {

case 'h':

return help();

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case 't':

free(arg_identifier);

if (isempty(optarg))

arg_identifier = NULL;

else {

arg_identifier = strdup(optarg);

if (!arg_identifier)

return log_oom();

}

break;

case 'p':

arg_priority = log_level_from_string(optarg);

if (arg_priority < 0) {

log_error("Failed to parse priority value.");

return arg_priority;

}

break;

case ARG_LEVEL_PREFIX: {

int k;

k = parse_boolean(optarg);

if (k < 0) {

log_error("Failed to parse level prefix value.");

return k;

}

arg_level_prefix = k;

break;

}

case '?':

return -EINVAL;

default:

assert_not_reached("Unhandled option");

}

}

return 1;

}

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

int r, fd = -1, saved_stderr = -1;

log_parse_environment();

log_open();

r = parse_argv(argc, argv);

if (r <= 0)

goto finish;

fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);

if (fd < 0) {

log_error("Failed to create stream fd: %s", strerror(-fd));

r = fd;

goto finish;

}

saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);

if (dup3(fd, STDOUT_FILENO, 0) < 0 ||

dup3(fd, STDERR_FILENO, 0) < 0) {

log_error("Failed to duplicate fd: %m");

r = -errno;

goto finish;

}

if (fd >= 3)

safe_close(fd);

fd = -1;

if (argc <= optind)

execl("/bin/cat", "/bin/cat", NULL);

else

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)

dup3(saved_stderr, STDERR_FILENO, 0);

log_error("Failed to execute process: %s", strerror(-r));

finish:

safe_close(fd);

safe_close(saved_stderr);

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}