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-rw-r--r--src/journal/cat.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/src/journal/cat.c b/src/journal/cat.c
new file mode 100644
index 0000000..9900bd2
--- /dev/null
+++ b/src/journal/cat.c
@@ -0,0 +1,168 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "sd-journal.h"
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "main-func.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "string-util.h"
+#include "syslog-util.h"
+#include "util.h"
+
+static const char *arg_identifier = 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"
+ "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"
+ " --stderr-priority=PRIORITY Set priority value (0..7) used for stderr\n"
+ " --level-prefix=BOOL Control whether level prefix shall be parsed\n"
+ "\nSee the %s for details.\n"
+ , program_invocation_short_name
+ , link
+ );
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_STDERR_PRIORITY,
+ 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' },
+ { "stderr-priority", required_argument, NULL, ARG_STDERR_PRIORITY },
+ { "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':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case 't':
+ if (isempty(optarg))
+ arg_identifier = NULL;
+ else
+ arg_identifier = 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: {
+ int k;
+
+ k = parse_boolean(optarg);
+ if (k < 0)
+ return log_error_errno(k, "Failed to parse level prefix value.");
+
+ arg_level_prefix = k;
+ break;
+ }
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ return 1;
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_close_ int outfd = -1, errfd = -1, saved_stderr = -1;
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ outfd = sd_journal_stream_fd(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(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 succcess + 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
+ (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);