From 200daf7dbbce90d4006d7dbf53affa48a110ed00 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@tele2.at>
Date: Sun, 28 Oct 2018 13:29:42 +0100
Subject: Import syslog utility program

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
---
 syslog.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 syslog.c

(limited to 'syslog.c')

diff --git a/syslog.c b/syslog.c
new file mode 100644
index 0000000..024428a
--- /dev/null
+++ b/syslog.c
@@ -0,0 +1,184 @@
+/* SPDX-License-Identifier: ISC */
+#include <getopt.h>
+#include <syslog.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include "syslogd.h"
+
+static int facility = 1;
+static int level = LOG_INFO;
+static int flags = LOG_NDELAY | LOG_NOWAIT;
+static const char *ident = "(shell)";
+
+static const struct option options[] = {
+	{ "help", no_argument, NULL, 'h' },
+	{ "version", no_argument, NULL, 'V' },
+	{ "console", required_argument, NULL, 'c' },
+	{ "facility", required_argument, NULL, 'f' },
+	{ "level", required_argument, NULL, 'l' },
+	{ "ident", required_argument, NULL, 'i' },
+	{ NULL, 0, NULL, 0 },
+};
+
+static const char *shortopt = "hVcf:l:i:";
+
+static const char *helptext =
+"Usage: syslog [OPTION]... [STRING]...\n\n"
+"Concatenate the given STRINGs and send a log message to the syslog daemon.\n"
+"\n"
+"The following OPTIONSs can be used:\n"
+"  -f, --facility <facility>  Logging facilty name or numeric identifier.\n"
+"  -l, --level <level>        Log level name or numeric identifier.\n"
+"  -i, --ident <name>         Program name for log syslog message.\n"
+"                             Default is \"%s\".\n\n"
+"  -c, --console              Write to the console if opening the syslog\n"
+"                             socket fails.\n\n"
+"  -h, --help                 Print this help text and exit\n"
+"  -V, --version              Print version information and exit\n\n";
+
+static const char *version_string =
+"syslog (usyslog) " PACKAGE_VERSION "\n"
+"Copyright (C) 2018 David Oberhollenzer\n\n"
+"This is free software: you are free to change and redistribute it.\n"
+"There is NO WARRANTY, to the extent permitted by law.\n";
+
+static void usage(int status)
+{
+	const char *str;
+	int i;
+
+	if (status != EXIT_SUCCESS) {
+		fputs("Try `syslog --help' for more information\n", stderr);
+	} else {
+		printf(helptext, ident);
+
+		fputs("The following values can be used for --level:\n",
+		      stdout);
+
+		i = 0;
+		while ((str = level_id_to_string(i)) != NULL) {
+			printf("  %s (=%d)%s\n", str, i,
+			       i == level ? ", set as default" : "");
+			++i;
+		}
+
+		fputs("\nThe following values can be used for --facility:\n",
+		      stdout);
+
+		i = 0;
+		while ((str = facility_id_to_string(i)) != NULL) {
+			printf("  %s (=%d)%s\n", str, i,
+			       i == facility ? ", set as default" : "");
+			++i;
+		}
+	}
+
+	exit(status);
+}
+
+static int readint(const char *str)
+{
+	int x = 0;
+
+	if (!isdigit(*str))
+		return -1;
+
+	while (isdigit(*str))
+		x = x * 10 + (*(str++)) - '0';
+
+	return (*str == '\0') ? x : -1;
+}
+
+static void process_options(int argc, char **argv)
+{
+	int c;
+
+	for (;;) {
+		c = getopt_long(argc, argv, shortopt, options, NULL);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'f':
+			facility = readint(optarg);
+			if (facility >= 0)
+				break;
+			facility = facility_id_from_string(optarg);
+			if (facility < 0) {
+				fprintf(stderr, "Unknown facility name '%s'\n",
+					optarg);
+				usage(EXIT_FAILURE);
+			}
+			break;
+		case 'l':
+			level = readint(optarg);
+			if (level >= 0)
+				break;
+			level = level_id_from_string(optarg);
+			if (level < 0) {
+				fprintf(stderr, "Unknown log level '%s'\n",
+					optarg);
+				usage(EXIT_FAILURE);
+			}
+			break;
+		case 'i':
+			ident = optarg;
+			break;
+		case 'c':
+			flags |= LOG_CONS;
+			break;
+		case 'V':
+			fputs(version_string, stdout);
+			exit(EXIT_SUCCESS);
+			break;
+		case 'h':
+			usage(EXIT_SUCCESS);
+			break;
+		default:
+			usage(EXIT_FAILURE);
+			break;
+		}
+	}
+}
+
+
+int main(int argc, char **argv)
+{
+	size_t len = 0;
+	char *str;
+	int i;
+
+	process_options(argc, argv);
+
+	if (optind >= argc) {
+		fputs("Error: no log string provided.\n", stderr);
+		usage(EXIT_FAILURE);
+	}
+
+	for (i = optind; i < argc; ++i)
+		len += strlen(argv[i]);
+
+	len += argc - optind - 1;
+
+	str = calloc(1, len + 1);
+	if (str == NULL) {
+		fputs("syslog: out of memory\n", stderr);
+		return EXIT_FAILURE;
+	}
+
+	for (i = optind; i < argc; ++i) {
+		if (i > optind)
+			strcat(str, " ");
+		strcat(str, argv[i]);
+	}
+
+	openlog(ident, flags, facility << 3);
+	syslog(level, "%s", str);
+	closelog();
+
+	free(str);
+	return EXIT_SUCCESS;
+}
-- 
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