Adding upstream version 2.33.1.upstream/2.33.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1294 insertions, 0 deletions

diff --git a/misc-utils/logger.c b/misc-utils/logger.c
new file mode 100644
index 0000000..ebdc56e
--- /dev/null
+++ b/misc-utils/logger.c
@@ -0,0 +1,1294 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * - fixed strerr(errno) in gettext calls
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <signal.h>
+#include <sys/uio.h>
+
+#include "all-io.h"
+#include "c.h"
+#include "closestream.h"
+#include "nls.h"
+#include "pathnames.h"
+#include "strutils.h"
+#include "xalloc.h"
+#include "strv.h"
+#include "list.h"
+
+#define	SYSLOG_NAMES
+#include <syslog.h>
+
+#ifdef HAVE_LIBSYSTEMD
+# define SD_JOURNAL_SUPPRESS_LOCATION
+# include <systemd/sd-daemon.h>
+# include <systemd/sd-journal.h>
+#endif
+
+#ifdef HAVE_SYS_TIMEX_H
+# include <sys/timex.h>
+#endif
+
+enum {
+	TYPE_UDP = (1 << 1),
+	TYPE_TCP = (1 << 2),
+	ALL_TYPES = TYPE_UDP | TYPE_TCP
+};
+
+enum {
+	AF_UNIX_ERRORS_OFF = 0,
+	AF_UNIX_ERRORS_ON,
+	AF_UNIX_ERRORS_AUTO
+};
+
+enum {
+	OPT_PRIO_PREFIX = CHAR_MAX + 1,
+	OPT_JOURNALD,
+	OPT_RFC3164,
+	OPT_RFC5424,
+	OPT_SOCKET_ERRORS,
+	OPT_MSGID,
+	OPT_NOACT,
+	OPT_ID,
+	OPT_STRUCTURED_DATA_ID,
+	OPT_STRUCTURED_DATA_PARAM,
+	OPT_OCTET_COUNT
+};
+
+/* rfc5424 structured data */
+struct structured_data {
+	char *id;		/* SD-ID */
+	char **params;		/* array with SD-PARAMs */
+
+	struct list_head	sds;
+};
+
+struct logger_ctl {
+	int fd;
+	int pri;
+	pid_t pid;			/* zero when unwanted */
+	char *hdr;			/* the syslog header (based on protocol) */
+	char const *tag;
+	char *msgid;
+	char *unix_socket;		/* -u <path> or default to _PATH_DEVLOG */
+	char *server;
+	char *port;
+	int socket_type;
+	size_t max_message_size;
+	struct list_head user_sds;	/* user defined rfc5424 structured data */
+	struct list_head reserved_sds;	/* standard rfc5424 structured data */
+
+	void (*syslogfp)(struct logger_ctl *ctl);
+
+	unsigned int
+			unix_socket_errors:1,	/* whether to report or not errors */
+			noact:1,		/* do not write to sockets */
+			prio_prefix:1,		/* read priority from input */
+			stderr_printout:1,	/* output message to stderr */
+			rfc5424_time:1,		/* include time stamp */
+			rfc5424_tq:1,		/* include time quality markup */
+			rfc5424_host:1,		/* include hostname */
+			skip_empty_lines:1,	/* do not send empty lines when processing files */
+			octet_count:1;		/* use RFC6587 octet counting */
+};
+
+#define is_connected(_ctl)	((_ctl)->fd >= 0)
+static void logger_reopen(struct logger_ctl *ctl);
+
+/*
+ * For tests we want to be able to control datetime outputs
+ */
+#ifdef TEST_LOGGER
+static inline int logger_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+	char *str = getenv("LOGGER_TEST_TIMEOFDAY");
+	uintmax_t sec, usec;
+
+	if (str && sscanf(str, "%ju.%ju", &sec, &usec) == 2) {
+		tv->tv_sec = sec;
+		tv->tv_usec = usec;
+		return tv->tv_sec >= 0 && tv->tv_usec >= 0 ? 0 : -EINVAL;
+	}
+
+	return gettimeofday(tv, tz);
+}
+
+static inline char *logger_xgethostname(void)
+{
+	char *str = getenv("LOGGER_TEST_HOSTNAME");
+	return str ? xstrdup(str) : xgethostname();
+}
+
+static inline pid_t logger_getpid(void)
+{
+	char *str = getenv("LOGGER_TEST_GETPID");
+	unsigned int pid;
+
+	if (str && sscanf(str, "%u", &pid) == 1)
+		return pid;
+	return getpid();
+}
+
+
+#undef HAVE_NTP_GETTIME		/* force to default non-NTP */
+
+#else /* !TEST_LOGGER */
+# define logger_gettimeofday(x, y)	gettimeofday(x, y)
+# define logger_xgethostname		xgethostname
+# define logger_getpid			getpid
+#endif
+
+
+static int decode(const char *name, const CODE *codetab)
+{
+	register const CODE *c;
+
+	if (name == NULL || *name == '\0')
+		return -1;
+	if (isdigit(*name)) {
+		int num;
+		char *end = NULL;
+
+		errno = 0;
+		num = strtol(name, &end, 10);
+		if (errno || name == end || (end && *end))
+			return -1;
+		for (c = codetab; c->c_name; c++)
+			if (num == c->c_val)
+				return num;
+		return -1;
+	}
+	for (c = codetab; c->c_name; c++)
+		if (!strcasecmp(name, c->c_name))
+			return (c->c_val);
+
+	return -1;
+}
+
+static int pencode(char *s)
+{
+	int facility, level;
+	char *separator;
+
+	separator = strchr(s, '.');
+	if (separator) {
+		*separator = '\0';
+		facility = decode(s, facilitynames);
+		if (facility < 0)
+			errx(EXIT_FAILURE, _("unknown facility name: %s"), s);
+		s = ++separator;
+	} else
+		facility = LOG_USER;
+	level = decode(s, prioritynames);
+	if (level < 0)
+		errx(EXIT_FAILURE, _("unknown priority name: %s"), s);
+	if (facility == LOG_KERN)
+		facility = LOG_USER;	/* kern is forbidden */
+	return ((level & LOG_PRIMASK) | (facility & LOG_FACMASK));
+}
+
+static int unix_socket(struct logger_ctl *ctl, const char *path, int *socket_type)
+{
+	int fd, i, type = -1;
+	static struct sockaddr_un s_addr;	/* AF_UNIX address of local logger */
+
+	if (strlen(path) >= sizeof(s_addr.sun_path))
+		errx(EXIT_FAILURE, _("openlog %s: pathname too long"), path);
+
+	s_addr.sun_family = AF_UNIX;
+	strcpy(s_addr.sun_path, path);
+
+	for (i = 2; i; i--) {
+		int st = -1;
+
+		if (i == 2 && *socket_type & TYPE_UDP) {
+			st = SOCK_DGRAM;
+			type = TYPE_UDP;
+		}
+		if (i == 1 && *socket_type & TYPE_TCP) {
+			st = SOCK_STREAM;
+			type = TYPE_TCP;
+		}
+		if (st == -1 || (fd = socket(AF_UNIX, st, 0)) == -1)
+			continue;
+		if (connect(fd, (struct sockaddr *)&s_addr, sizeof(s_addr)) == -1) {
+			close(fd);
+			continue;
+		}
+		break;
+	}
+
+	if (i == 0) {
+		if (ctl->unix_socket_errors)
+			err(EXIT_FAILURE, _("socket %s"), path);
+
+		/* write_output() will try to reconnect */
+		return -1;
+	}
+
+	/* replace ALL_TYPES with the real TYPE_* */
+	if (type > 0 && type != *socket_type)
+		*socket_type = type;
+	return fd;
+}
+
+static int inet_socket(const char *servername, const char *port, int *socket_type)
+{
+	int fd, errcode, i, type = -1;
+	struct addrinfo hints, *res;
+	const char *p = port;
+
+	for (i = 2; i; i--) {
+		memset(&hints, 0, sizeof(hints));
+		if (i == 2 && *socket_type & TYPE_UDP) {
+			hints.ai_socktype = SOCK_DGRAM;
+			type = TYPE_UDP;
+			if (port == NULL)
+				p = "syslog";
+		}
+		if (i == 1 && *socket_type & TYPE_TCP) {
+			hints.ai_socktype = SOCK_STREAM;
+			type = TYPE_TCP;
+			if (port == NULL)
+				p = "syslog-conn";
+		}
+		if (hints.ai_socktype == 0)
+			continue;
+		hints.ai_family = AF_UNSPEC;
+		errcode = getaddrinfo(servername, p, &hints, &res);
+		if (errcode != 0)
+			errx(EXIT_FAILURE, _("failed to resolve name %s port %s: %s"),
+			     servername, p, gai_strerror(errcode));
+		if ((fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) {
+			freeaddrinfo(res);
+			continue;
+		}
+		if (connect(fd, res->ai_addr, res->ai_addrlen) == -1) {
+			freeaddrinfo(res);
+			close(fd);
+			continue;
+		}
+
+		freeaddrinfo(res);
+		break;
+	}
+
+	if (i == 0)
+		errx(EXIT_FAILURE, _("failed to connect to %s port %s"), servername, p);
+
+	/* replace ALL_TYPES with the real TYPE_* */
+	if (type > 0 && type != *socket_type)
+		*socket_type = type;
+	return fd;
+}
+
+#ifdef HAVE_LIBSYSTEMD
+static int journald_entry(struct logger_ctl *ctl, FILE *fp)
+{
+	struct iovec *iovec;
+	char *buf = NULL;
+	ssize_t sz;
+	int n, lines, vectors = 8, ret = 0;
+	size_t dummy = 0;
+
+	iovec = xmalloc(vectors * sizeof(struct iovec));
+	for (lines = 0; /* nothing */ ; lines++) {
+		buf = NULL;
+		sz = getline(&buf, &dummy, fp);
+		if (sz == -1 ||
+		   (sz = rtrim_whitespace((unsigned char *) buf)) == 0) {
+			free(buf);
+			break;
+		}
+		if (lines == vectors) {
+			vectors *= 2;
+			if (IOV_MAX < vectors)
+				errx(EXIT_FAILURE, _("maximum input lines (%d) exceeded"), IOV_MAX);
+			iovec = xrealloc(iovec, vectors * sizeof(struct iovec));
+		}
+		iovec[lines].iov_base = buf;
+		iovec[lines].iov_len = sz;
+	}
+
+	if (!ctl->noact)
+		ret = sd_journal_sendv(iovec, lines);
+	if (ctl->stderr_printout) {
+		for (n = 0; n < lines; n++)
+			fprintf(stderr, "%s\n", (char *) iovec[n].iov_base);
+	}
+	for (n = 0; n < lines; n++)
+		free(iovec[n].iov_base);
+	free(iovec);
+	return ret;
+}
+#endif
+
+static char const *xgetlogin(void)
+{
+	char const *cp;
+	struct passwd *pw;
+
+	if (!(cp = getlogin()) || !*cp)
+		cp = (pw = getpwuid(geteuid()))? pw->pw_name : "<someone>";
+	return cp;
+}
+
+/* this creates a timestamp based on current time according to the
+ * fine rules of RFC3164, most importantly it ensures in a portable
+ * way that the month day is correctly written (with a SP instead
+ * of a leading 0). The function uses a static buffer which is
+ * overwritten on the next call (just like ctime() does).
+ */
+static char const *rfc3164_current_time(void)
+{
+	static char time[32];
+	struct timeval tv;
+	struct tm *tm;
+	static char const * const monthnames[] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+		"Sep", "Oct", "Nov", "Dec"
+	};
+
+	logger_gettimeofday(&tv, NULL);
+	tm = localtime(&tv.tv_sec);
+	snprintf(time, sizeof(time),"%s %2d %2.2d:%2.2d:%2.2d",
+		monthnames[tm->tm_mon], tm->tm_mday,
+		tm->tm_hour, tm->tm_min, tm->tm_sec);
+	return time;
+}
+
+#define next_iovec(ary, idx) __extension__ ({		\
+		assert(ARRAY_SIZE(ary) > (size_t)idx);	\
+		assert(idx >= 0);			\
+		&ary[idx++];				\
+})
+
+#define iovec_add_string(ary, idx, str, len)		\
+	do {						\
+		struct iovec *v = next_iovec(ary, idx);	\
+		v->iov_base = (void *) str;		\
+		v->iov_len = len ? len : strlen(str);	\
+	} while (0)
+
+#define iovec_memcmp(ary, idx, str, len)		\
+		memcmp((ary)[(idx) - 1].iov_base, str, len)
+
+/* writes generated buffer to desired destination. For TCP syslog,
+ * we use RFC6587 octet-stuffing (unless octet-counting is selected).
+ * This is not great, but doing full blown RFC5425 (TLS) looks like
+ * it is too much for the logger utility. If octet-counting is
+ * selected, we use that.
+ */
+static void write_output(struct logger_ctl *ctl, const char *const msg)
+{
+	struct iovec iov[4];
+	int iovlen = 0;
+	char *octet = NULL;
+
+	/* initial connect failed? */
+	if (!ctl->noact && !is_connected(ctl))
+		logger_reopen(ctl);
+
+	/* 1) octen count */
+	if (ctl->octet_count) {
+		size_t len = xasprintf(&octet, "%zu ", strlen(ctl->hdr) + strlen(msg));
+		iovec_add_string(iov, iovlen, octet, len);
+	}
+
+	/* 2) header */
+	iovec_add_string(iov, iovlen, ctl->hdr, 0);
+
+	/* 3) message */
+	iovec_add_string(iov, iovlen, msg, 0);
+
+	if (!ctl->noact && is_connected(ctl)) {
+		struct msghdr message = { 0 };
+#ifdef SCM_CREDENTIALS
+		struct cmsghdr *cmhp;
+		struct ucred *cred;
+		union {
+			struct cmsghdr cmh;
+			char   control[CMSG_SPACE(sizeof(struct ucred))];
+		} cbuf;
+#endif
+
+		/* 4) add extra \n to make sure message is terminated */
+		if ((ctl->socket_type == TYPE_TCP) && !ctl->octet_count)
+			iovec_add_string(iov, iovlen, "\n", 1);
+
+		message.msg_iov = iov;
+		message.msg_iovlen = iovlen;
+
+#ifdef SCM_CREDENTIALS
+		/* syslog/journald may follow local socket credentials rather
+		 * than in the message PID. If we use --id as root than we can
+		 * force kernel to accept another valid PID than the real logger(1)
+		 * PID.
+		 */
+		if (ctl->pid && !ctl->server && ctl->pid != getpid()
+		    && geteuid() == 0 && kill(ctl->pid, 0) == 0) {
+
+			message.msg_control = cbuf.control;
+			message.msg_controllen = CMSG_SPACE(sizeof(struct ucred));
+
+			cmhp = CMSG_FIRSTHDR(&message);
+			cmhp->cmsg_len = CMSG_LEN(sizeof(struct ucred));
+			cmhp->cmsg_level = SOL_SOCKET;
+			cmhp->cmsg_type = SCM_CREDENTIALS;
+			cred = (struct ucred *) CMSG_DATA(cmhp);
+
+			cred->pid = ctl->pid;
+		}
+#endif
+		/* Note that logger(1) maybe executed for long time (as pipe
+		 * reader) and connection endpoint (syslogd) may be restarted.
+		 *
+		 * The libc syslog() function reconnects on failed send().
+		 * Let's do the same to be robust.    [kzak -- Oct 2017]
+		 *
+		 * MSG_NOSIGNAL is POSIX.1-2008 compatible, but it for example
+		 * not supported by apple-darwin15.6.0.
+		 */
+#ifndef MSG_NOSIGNAL
+# define MSG_NOSIGNAL 0
+#endif
+		if (sendmsg(ctl->fd, &message, MSG_NOSIGNAL) < 0) {
+			logger_reopen(ctl);
+			if (sendmsg(ctl->fd, &message, MSG_NOSIGNAL) < 0)
+				warn(_("send message failed"));
+		}
+	}
+
+	if (ctl->stderr_printout) {
+		/* make sure it's terminated for stderr */
+		if (iovec_memcmp(iov, iovlen, "\n", 1) != 0)
+			iovec_add_string(iov, iovlen, "\n", 1);
+
+		ignore_result( writev(STDERR_FILENO, iov, iovlen) );
+	}
+
+	free(octet);
+}
+
+#define NILVALUE "-"
+static void syslog_rfc3164_header(struct logger_ctl *const ctl)
+{
+	char pid[30], *hostname;
+
+	*pid = '\0';
+	if (ctl->pid)
+		snprintf(pid, sizeof(pid), "[%d]", ctl->pid);
+
+	if ((hostname = logger_xgethostname())) {
+		char *dot = strchr(hostname, '.');
+		if (dot)
+			*dot = '\0';
+	} else
+		hostname = xstrdup(NILVALUE);
+
+	xasprintf(&ctl->hdr, "<%d>%.15s %s %.200s%s: ",
+		 ctl->pri, rfc3164_current_time(), hostname, ctl->tag, pid);
+
+	free(hostname);
+}
+
+static inline struct list_head *get_user_structured_data(struct logger_ctl *ctl)
+{
+	return &ctl->user_sds;
+}
+
+static inline struct list_head *get_reserved_structured_data(struct logger_ctl *ctl)
+{
+	return &ctl->reserved_sds;
+}
+
+static int has_structured_data_id(struct list_head *ls, const char *id)
+{
+	struct list_head *p;
+
+	if (!ls || list_empty(ls))
+		return 0;
+
+	list_for_each(p, ls) {
+		struct structured_data *sd = list_entry(p, struct structured_data, sds);
+		if (sd->id && strcmp(sd->id, id) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+static void add_structured_data_id(struct list_head *ls, const char *id)
+{
+	struct structured_data *sd;
+
+	assert(id);
+
+	if (has_structured_data_id(ls, id))
+		errx(EXIT_FAILURE, _("structured data ID '%s' is not unique"), id);
+
+	sd = xcalloc(1, sizeof(*sd));
+	INIT_LIST_HEAD(&sd->sds);
+	sd->id = xstrdup(id);
+
+	list_add_tail(&sd->sds, ls);
+}
+
+static void add_structured_data_param(struct list_head *ls, const char *param)
+{
+	struct structured_data *sd;
+
+	if (list_empty(ls))
+		errx(EXIT_FAILURE, _("--sd-id was not specified for --sd-param %s"), param);
+
+	assert(param);
+
+	sd = list_last_entry(ls, struct structured_data, sds);
+
+	if (strv_extend(&sd->params,  param))
+		err_oom();
+}
+
+static void add_structured_data_paramf(struct list_head *ls, const char *fmt, ...)
+{
+	struct structured_data *sd;
+	va_list ap;
+	int x;
+
+	assert(!list_empty(ls));
+	assert(fmt);
+
+	sd = list_last_entry(ls, struct structured_data, sds);
+	va_start(ap, fmt);
+	x = strv_extendv(&sd->params, fmt, ap);
+	va_end(ap);
+
+	if (x)
+		err_oom();
+}
+
+static char *strdup_structured_data(struct structured_data *sd)
+{
+	char *res, *tmp;
+
+	if (strv_isempty(sd->params))
+		return NULL;
+
+	xasprintf(&res, "[%s %s]", sd->id,
+			(tmp = strv_join(sd->params, " ")));
+	free(tmp);
+	return res;
+}
+
+static char *strdup_structured_data_list(struct list_head *ls)
+{
+	struct list_head *p;
+	char *res = NULL;
+
+	list_for_each(p, ls) {
+		struct structured_data *sd = list_entry(p, struct structured_data, sds);
+		char *one = strdup_structured_data(sd);
+		char *tmp = res;
+
+		if (!one)
+			continue;
+		res = strappend(tmp, one);
+		free(tmp);
+		free(one);
+	}
+
+	return res;
+}
+
+static char *get_structured_data_string(struct logger_ctl *ctl)
+{
+	char *sys = NULL, *usr = NULL, *res;
+
+	if (!list_empty(&ctl->reserved_sds))
+		sys = strdup_structured_data_list(&ctl->reserved_sds);
+	if (!list_empty(&ctl->user_sds))
+		usr = strdup_structured_data_list(&ctl->user_sds);
+
+	if (sys && usr) {
+		res = strappend(sys, usr);
+		free(sys);
+		free(usr);
+	} else
+		res = sys ? sys : usr;
+
+	return res;
+}
+
+static int valid_structured_data_param(const char *str)
+{
+	char *eq  = strchr(str, '='),
+	     *qm1 = strchr(str, '"'),
+	     *qm2 = qm1 ? strchr(qm1 + 1, '"') : NULL;
+
+	if (!eq || !qm1 || !qm2)		/* something is missing */
+		return 0;
+
+	/* foo="bar" */
+	return eq > str && eq < qm1 && eq + 1 == qm1 && qm1 < qm2 && *(qm2 + 1) == '\0';
+}
+
+/* SD-ID format:
+ *	name@<private enterprise number>, e.g., "ourSDID@32473"
+ */
+static int valid_structured_data_id(const char *str)
+{
+	char *at = strchr(str, '@');
+	const char *p;
+
+	/* standardized IDs without @<digits> */
+	if (!at && (strcmp(str, "timeQuality") == 0 ||
+		    strcmp(str, "origin") == 0 ||
+		    strcmp(str, "meta") == 0))
+		return 1;
+
+	if (!at || at == str || !*(at + 1))
+		return 0;
+
+	/* <digits> or <digits>.<digits>[...] */
+	for (p = at + 1; p && *p; p++) {
+		const char *end;
+
+		if (isdigit_strend(p, &end))
+			break;	/* only digits in the string */
+
+		if (end == NULL || end == p ||
+		    *end != '.' || *(end + 1) == '\0')
+			return 0;
+		p = end;
+	}
+
+	/* check for forbidden chars in the <name> */
+	for (p = str; p < at; p++) {
+		if (*p == '[' || *p == '=' || *p == '"' || *p == '@')
+			return 0;
+		if (isblank((unsigned char) *p) || iscntrl((unsigned char) *p))
+			return 0;
+	}
+	return 1;
+}
+
+
+/* Some field mappings may be controversial, thus I give the reason
+ * why this specific mapping was used:
+ * APP-NAME <-- tag
+ *    Some may argue that "logger" is a better fit, but we think
+ *    this is better inline of what other implementations do. In
+ *    rsyslog, for example, the TAG value is populated from APP-NAME.
+ * PROCID <-- pid
+ *    This is a relatively straightforward interpretation from
+ *    RFC5424, sect. 6.2.6.
+ * MSGID <-- msgid (from --msgid)
+ *    One may argue that the string "logger" would be better suited
+ *    here so that a receiver can identify the sender process.
+ *    However, this does not sound like a good match to RFC5424,
+ *    sect. 6.2.7.
+ * Note that appendix A.1 of RFC5424 does not provide clear guidance
+ * of how these fields should be used. This is the case because the
+ * IETF working group couldn't arrive at a clear agreement when we
+ * specified RFC5424. The rest of the field mappings should be
+ * pretty clear from RFC5424. -- Rainer Gerhards, 2015-03-10
+ */
+static void syslog_rfc5424_header(struct logger_ctl *const ctl)
+{
+	char *time;
+	char *hostname;
+	char const *app_name = ctl->tag;
+	char *procid;
+	char *const msgid = xstrdup(ctl->msgid ? ctl->msgid : NILVALUE);
+	char *structured = NULL;
+	struct list_head *sd;
+
+	if (ctl->rfc5424_time) {
+		struct timeval tv;
+		struct tm *tm;
+
+		logger_gettimeofday(&tv, NULL);
+		if ((tm = localtime(&tv.tv_sec)) != NULL) {
+			char fmt[64];
+			const size_t i = strftime(fmt, sizeof(fmt),
+						  "%Y-%m-%dT%H:%M:%S.%%06u%z ", tm);
+			/* patch TZ info to comply with RFC3339 (we left SP at end) */
+			fmt[i - 1] = fmt[i - 2];
+			fmt[i - 2] = fmt[i - 3];
+			fmt[i - 3] = ':';
+			xasprintf(&time, fmt, tv.tv_usec);
+		} else
+			err(EXIT_FAILURE, _("localtime() failed"));
+	} else
+		time = xstrdup(NILVALUE);
+
+	if (ctl->rfc5424_host) {
+		if (!(hostname = logger_xgethostname()))
+			hostname = xstrdup(NILVALUE);
+		/* Arbitrary looking 'if (var < strlen()) checks originate from
+		 * RFC 5424 - 6 Syslog Message Format definition.  */
+		if (255 < strlen(hostname))
+			errx(EXIT_FAILURE, _("hostname '%s' is too long"),
+			     hostname);
+	} else
+		hostname = xstrdup(NILVALUE);
+
+	if (48 < strlen(ctl->tag))
+		errx(EXIT_FAILURE, _("tag '%s' is too long"), ctl->tag);
+
+	if (ctl->pid)
+		xasprintf(&procid, "%d", ctl->pid);
+	else
+		procid = xstrdup(NILVALUE);
+
+	sd = get_reserved_structured_data(ctl);
+
+	/* time quality structured data (maybe overwritten by --sd-id timeQuality) */
+	if (ctl->rfc5424_tq && !has_structured_data_id(sd, "timeQuality")) {
+
+		add_structured_data_id(sd, "timeQuality");
+		add_structured_data_param(sd, "tzKnown=\"1\"");
+
+#ifdef HAVE_NTP_GETTIME
+		struct ntptimeval ntptv;
+
+		if (ntp_gettime(&ntptv) == TIME_OK) {
+			add_structured_data_param(sd, "isSynced=\"1\"");
+			add_structured_data_paramf(sd, "syncAccuracy=\"%ld\"", ntptv.maxerror);
+		} else
+#endif
+			add_structured_data_paramf(sd, "isSynced=\"0\"");
+	}
+
+	/* convert all structured data to string */
+	structured = get_structured_data_string(ctl);
+	if (!structured)
+		structured = xstrdup(NILVALUE);
+
+	xasprintf(&ctl->hdr, "<%d>1 %s %s %s %s %s %s ",
+		ctl->pri,
+		time,
+		hostname,
+		app_name,
+		procid,
+		msgid,
+		structured);
+
+	free(time);
+	free(hostname);
+	/* app_name points to ctl->tag, do NOT free! */
+	free(procid);
+	free(msgid);
+	free(structured);
+}
+
+static void parse_rfc5424_flags(struct logger_ctl *ctl, char *s)
+{
+	char *in, *tok;
+
+	in = s;
+	while ((tok = strtok(in, ","))) {
+		in = NULL;
+		if (!strcmp(tok, "notime")) {
+			ctl->rfc5424_time = 0;
+			ctl->rfc5424_tq = 0;
+		} else if (!strcmp(tok, "notq"))
+			ctl->rfc5424_tq = 0;
+		else if (!strcmp(tok, "nohost"))
+			ctl->rfc5424_host = 0;
+		else
+			warnx(_("ignoring unknown option argument: %s"), tok);
+	}
+}
+
+static int parse_unix_socket_errors_flags(char *s)
+{
+	if (!strcmp(s, "off"))
+		return AF_UNIX_ERRORS_OFF;
+	if (!strcmp(s, "on"))
+		return AF_UNIX_ERRORS_ON;
+	if (!strcmp(s, "auto"))
+		return AF_UNIX_ERRORS_AUTO;
+	warnx(_("invalid argument: %s: using automatic errors"), s);
+	return AF_UNIX_ERRORS_AUTO;
+}
+
+static void syslog_local_header(struct logger_ctl *const ctl)
+{
+	char pid[32];
+
+	if (ctl->pid)
+		snprintf(pid, sizeof(pid), "[%d]", ctl->pid);
+	else
+		pid[0] = '\0';
+
+	xasprintf(&ctl->hdr, "<%d>%s %s%s: ", ctl->pri, rfc3164_current_time(),
+		ctl->tag, pid);
+}
+
+static void generate_syslog_header(struct logger_ctl *const ctl)
+{
+	free(ctl->hdr);
+	ctl->hdr = NULL;
+	ctl->syslogfp(ctl);
+}
+
+/* just open, nothing else */
+static void __logger_open(struct logger_ctl *ctl)
+{
+	if (ctl->server) {
+		ctl->fd = inet_socket(ctl->server, ctl->port, &ctl->socket_type);
+	} else {
+		if (!ctl->unix_socket)
+			ctl->unix_socket = _PATH_DEVLOG;
+
+		ctl->fd = unix_socket(ctl, ctl->unix_socket, &ctl->socket_type);
+	}
+}
+
+/* open and initialize relevant @ctl tuff */
+static void logger_open(struct logger_ctl *ctl)
+{
+	__logger_open(ctl);
+
+	if (!ctl->syslogfp)
+		ctl->syslogfp = ctl->server ? syslog_rfc5424_header :
+					      syslog_local_header;
+	if (!ctl->tag)
+		ctl->tag = xgetlogin();
+
+	generate_syslog_header(ctl);
+}
+
+/* re-open; usually after failed connection */
+static void logger_reopen(struct logger_ctl *ctl)
+{
+	if (ctl->fd != -1)
+		close(ctl->fd);
+	ctl->fd = -1;
+
+	__logger_open(ctl);
+}
+
+static void logger_command_line(struct logger_ctl *ctl, char **argv)
+{
+	/* note: we never re-generate the syslog header here, even if we
+	 * generate multiple messages. If so, we think it is the right thing
+	 * to do to report them with the same timestamp, as the user actually
+	 * intended to send a single message.
+	 */
+	char *const buf = xmalloc(ctl->max_message_size + 1);
+	char *p = buf;
+	const char *endp = buf + ctl->max_message_size - 1;
+	size_t len;
+
+	while (*argv) {
+		len = strlen(*argv);
+		if (endp < p + len && p != buf) {
+			write_output(ctl, buf);
+			p = buf;
+		}
+		if (ctl->max_message_size < len) {
+			(*argv)[ctl->max_message_size] = '\0'; /* truncate */
+			write_output(ctl, *argv++);
+			continue;
+		}
+		if (p != buf)
+			*p++ = ' ';
+		memmove(p, *argv++, len);
+		*(p += len) = '\0';
+	}
+	if (p != buf)
+		write_output(ctl, buf);
+	free(buf);
+}
+
+static void logger_stdin(struct logger_ctl *ctl)
+{
+	/* note: we re-generate the syslog header for each log message to
+	 * update header timestamps and to reflect possible priority changes.
+	 * The initial header is generated by logger_open().
+	 */
+	int has_header = 1;
+	int default_priority = ctl->pri;
+	int last_pri = default_priority;
+	size_t max_usrmsg_size = ctl->max_message_size - strlen(ctl->hdr);
+	char *const buf = xmalloc(max_usrmsg_size + 2 + 2);
+	int pri;
+	int c;
+	size_t i;
+
+	c = getchar();
+	while (c != EOF) {
+		i = 0;
+		if (ctl->prio_prefix && c == '<') {
+			pri = 0;
+			buf[i++] = c;
+			while (isdigit(c = getchar()) && pri <= 191) {
+				buf[i++] = c;
+				pri = pri * 10 + c - '0';
+			}
+			if (c != EOF && c != '\n')
+				buf[i++] = c;
+			if (c == '>' && 0 <= pri && pri <= 191) {
+				/* valid RFC PRI values */
+				i = 0;
+				if (pri < 8)	/* kern facility is forbidden */
+					pri |= 8;
+				ctl->pri = pri;
+			} else
+				ctl->pri = default_priority;
+
+			if (ctl->pri != last_pri) {
+				has_header = 0;
+				max_usrmsg_size =
+				    ctl->max_message_size - strlen(ctl->hdr);
+				last_pri = ctl->pri;
+			}
+			if (c != EOF && c != '\n')
+				c = getchar();
+		}
+
+		while (c != EOF && c != '\n' && i < max_usrmsg_size) {
+			buf[i++] = c;
+			c = getchar();
+		}
+		buf[i] = '\0';
+
+		if (i > 0 || !ctl->skip_empty_lines) {
+			if (!has_header)
+				generate_syslog_header(ctl);
+			write_output(ctl, buf);
+			has_header = 0;
+		}
+
+		if (c == '\n')	/* discard line terminator */
+			c = getchar();
+	}
+
+	free(buf);
+}
+
+static void logger_close(const struct logger_ctl *ctl)
+{
+	if (ctl->fd != -1 && close(ctl->fd) != 0)
+		err(EXIT_FAILURE, _("close failed"));
+	free(ctl->hdr);
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out, _(" %s [options] [<message>]\n"), program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Enter messages into the system log.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(_(" -i                       log the logger command's PID\n"), out);
+	fputs(_("     --id[=<id>]          log the given <id>, or otherwise the PID\n"), out);
+	fputs(_(" -f, --file <file>        log the contents of this file\n"), out);
+	fputs(_(" -e, --skip-empty         do not log empty lines when processing files\n"), out);
+	fputs(_("     --no-act             do everything except the write the log\n"), out);
+	fputs(_(" -p, --priority <prio>    mark given message with this priority\n"), out);
+	fputs(_("     --octet-count        use rfc6587 octet counting\n"), out);
+	fputs(_("     --prio-prefix        look for a prefix on every line read from stdin\n"), out);
+	fputs(_(" -s, --stderr             output message to standard error as well\n"), out);
+	fputs(_(" -S, --size <size>        maximum size for a single message\n"), out);
+	fputs(_(" -t, --tag <tag>          mark every line with this tag\n"), out);
+	fputs(_(" -n, --server <name>      write to this remote syslog server\n"), out);
+	fputs(_(" -P, --port <port>        use this port for UDP or TCP connection\n"), out);
+	fputs(_(" -T, --tcp                use TCP only\n"), out);
+	fputs(_(" -d, --udp                use UDP only\n"), out);
+	fputs(_("     --rfc3164            use the obsolete BSD syslog protocol\n"), out);
+	fputs(_("     --rfc5424[=<snip>]   use the syslog protocol (the default for remote);\n"
+		"                            <snip> can be notime, or notq, and/or nohost\n"), out);
+	fputs(_("     --sd-id <id>         rfc5424 structured data ID\n"), out);
+	fputs(_("     --sd-param <data>    rfc5424 structured data name=value\n"), out);
+	fputs(_("     --msgid <msgid>      set rfc5424 message id field\n"), out);
+	fputs(_(" -u, --socket <socket>    write to this Unix socket\n"), out);
+	fputs(_("     --socket-errors[=<on|off|auto>]\n"
+		"                          print connection errors when using Unix sockets\n"), out);
+#ifdef HAVE_LIBSYSTEMD
+	fputs(_("     --journald[=<file>]  write journald entry\n"), out);
+#endif
+
+	fputs(USAGE_SEPARATOR, out);
+	printf(USAGE_HELP_OPTIONS(26));
+	printf(USAGE_MAN_TAIL("logger(1)"));
+
+	exit(EXIT_SUCCESS);
+}
+
+/*
+ * logger -- read and log utility
+ *
+ *	Reads from an input and arranges to write the result on the system
+ *	log.
+ */
+int main(int argc, char **argv)
+{
+	struct logger_ctl ctl = {
+		.fd = -1,
+		.pid = 0,
+		.pri = LOG_USER | LOG_NOTICE,
+		.prio_prefix = 0,
+		.tag = NULL,
+		.unix_socket = NULL,
+		.unix_socket_errors = 0,
+		.server = NULL,
+		.port = NULL,
+		.hdr = NULL,
+		.msgid = NULL,
+		.socket_type = ALL_TYPES,
+		.max_message_size = 1024,
+		.rfc5424_time = 1,
+		.rfc5424_tq = 1,
+		.rfc5424_host = 1,
+		.skip_empty_lines = 0
+	};
+	int ch;
+	int stdout_reopened = 0;
+	int unix_socket_errors_mode = AF_UNIX_ERRORS_AUTO;
+#ifdef HAVE_LIBSYSTEMD
+	FILE *jfd = NULL;
+#endif
+	static const struct option longopts[] = {
+		{ "id",		   optional_argument, 0, OPT_ID		   },
+		{ "stderr",	   no_argument,	      0, 's'		   },
+		{ "file",	   required_argument, 0, 'f'		   },
+		{ "no-act",        no_argument,       0, OPT_NOACT,	   },
+		{ "priority",	   required_argument, 0, 'p'		   },
+		{ "tag",	   required_argument, 0, 't'		   },
+		{ "socket",	   required_argument, 0, 'u'		   },
+		{ "socket-errors", required_argument, 0, OPT_SOCKET_ERRORS },
+		{ "udp",	   no_argument,	      0, 'd'		   },
+		{ "tcp",	   no_argument,	      0, 'T'		   },
+		{ "server",	   required_argument, 0, 'n'		   },
+		{ "port",	   required_argument, 0, 'P'		   },
+		{ "version",	   no_argument,	      0, 'V'		   },
+		{ "help",	   no_argument,	      0, 'h'		   },
+		{ "octet-count",   no_argument,	      0, OPT_OCTET_COUNT   },
+		{ "prio-prefix",   no_argument,	      0, OPT_PRIO_PREFIX   },
+		{ "rfc3164",	   no_argument,	      0, OPT_RFC3164	   },
+		{ "rfc5424",	   optional_argument, 0, OPT_RFC5424	   },
+		{ "size",	   required_argument, 0, 'S'		   },
+		{ "msgid",	   required_argument, 0, OPT_MSGID	   },
+		{ "skip-empty",	   no_argument,	      0, 'e'		   },
+		{ "sd-id",         required_argument, 0, OPT_STRUCTURED_DATA_ID          },
+		{ "sd-param",      required_argument, 0, OPT_STRUCTURED_DATA_PARAM       },
+#ifdef HAVE_LIBSYSTEMD
+		{ "journald",	   optional_argument, 0, OPT_JOURNALD	   },
+#endif
+		{ NULL,		   0,		      0, 0		   }
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	atexit(close_stdout);
+
+	INIT_LIST_HEAD(&ctl.user_sds);
+	INIT_LIST_HEAD(&ctl.reserved_sds);
+
+	while ((ch = getopt_long(argc, argv, "ef:ip:S:st:u:dTn:P:Vh",
+					    longopts, NULL)) != -1) {
+		switch (ch) {
+		case 'f':		/* file to log */
+			if (freopen(optarg, "r", stdin) == NULL)
+				err(EXIT_FAILURE, _("file %s"), optarg);
+			stdout_reopened = 1;
+			break;
+		case 'e':
+			ctl.skip_empty_lines = 1;
+			break;
+		case 'i':		/* log process id also */
+			ctl.pid = logger_getpid();
+			break;
+		case OPT_ID:
+			if (optarg) {
+				const char *p = optarg;
+
+				if (*p == '=')
+					p++;
+				ctl.pid = strtoul_or_err(optarg, _("failed to parse id"));
+			} else
+				ctl.pid = logger_getpid();
+			break;
+		case 'p':		/* priority */
+			ctl.pri = pencode(optarg);
+			break;
+		case 's':		/* log to standard error */
+			ctl.stderr_printout = 1;
+			break;
+		case 't':		/* tag */
+			ctl.tag = optarg;
+			break;
+		case 'u':		/* unix socket */
+			ctl.unix_socket = optarg;
+			break;
+		case 'S':		/* max message size */
+			ctl.max_message_size = strtosize_or_err(optarg,
+				_("failed to parse message size"));
+			break;
+		case 'd':
+			ctl.socket_type = TYPE_UDP;
+			break;
+		case 'T':
+			ctl.socket_type = TYPE_TCP;
+			break;
+		case 'n':
+			ctl.server = optarg;
+			break;
+		case 'P':
+			ctl.port = optarg;
+			break;
+		case 'V':
+			printf(UTIL_LINUX_VERSION);
+			exit(EXIT_SUCCESS);
+		case 'h':
+			usage();
+		case OPT_OCTET_COUNT:
+			ctl.octet_count = 1;
+			break;
+		case OPT_PRIO_PREFIX:
+			ctl.prio_prefix = 1;
+			break;
+		case OPT_RFC3164:
+			ctl.syslogfp = syslog_rfc3164_header;
+			break;
+		case OPT_RFC5424:
+			ctl.syslogfp = syslog_rfc5424_header;
+			if (optarg)
+				parse_rfc5424_flags(&ctl, optarg);
+			break;
+		case OPT_MSGID:
+			if (strchr(optarg, ' '))
+				errx(EXIT_FAILURE, _("--msgid cannot contain space"));
+			ctl.msgid = optarg;
+			break;
+#ifdef HAVE_LIBSYSTEMD
+		case OPT_JOURNALD:
+			if (optarg) {
+				jfd = fopen(optarg, "r");
+				if (!jfd)
+					err(EXIT_FAILURE, _("cannot open %s"),
+					    optarg);
+			} else
+				jfd = stdin;
+			break;
+#endif
+		case OPT_SOCKET_ERRORS:
+			unix_socket_errors_mode = parse_unix_socket_errors_flags(optarg);
+			break;
+		case OPT_NOACT:
+			ctl.noact = 1;
+			break;
+		case OPT_STRUCTURED_DATA_ID:
+			if (!valid_structured_data_id(optarg))
+				errx(EXIT_FAILURE, _("invalid structured data ID: '%s'"), optarg);
+			add_structured_data_id(get_user_structured_data(&ctl), optarg);
+			break;
+		case OPT_STRUCTURED_DATA_PARAM:
+			if (!valid_structured_data_param(optarg))
+				errx(EXIT_FAILURE, _("invalid structured data parameter: '%s'"), optarg);
+			add_structured_data_param(get_user_structured_data(&ctl), optarg);
+			break;
+		default:
+			errtryhelp(EXIT_FAILURE);
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (stdout_reopened && argc)
+		warnx(_("--file <file> and <message> are mutually exclusive, message is ignored"));
+#ifdef HAVE_LIBSYSTEMD
+	if (jfd) {
+		int ret = journald_entry(&ctl, jfd);
+		if (stdin != jfd)
+			fclose(jfd);
+		if (ret)
+			errx(EXIT_FAILURE, _("journald entry could not be written"));
+		return EXIT_SUCCESS;
+	}
+#endif
+
+	/* user overwrites build-in SD-ELEMENT */
+	if (has_structured_data_id(get_user_structured_data(&ctl), "timeQuality"))
+		ctl.rfc5424_tq = 0;
+
+	switch (unix_socket_errors_mode) {
+	case AF_UNIX_ERRORS_OFF:
+		ctl.unix_socket_errors = 0;
+		break;
+	case AF_UNIX_ERRORS_ON:
+		ctl.unix_socket_errors = 1;
+		break;
+	case AF_UNIX_ERRORS_AUTO:
+		ctl.unix_socket_errors = ctl.noact || ctl.stderr_printout;
+#ifdef HAVE_LIBSYSTEMD
+		ctl.unix_socket_errors |= !!sd_booted();
+#endif
+		break;
+	default:
+		abort();
+	}
+	logger_open(&ctl);
+	if (0 < argc)
+		logger_command_line(&ctl, argv);
+	else
+		/* Note. --file <arg> reopens stdin making the below
+		 * function to be used for file inputs. */
+		logger_stdin(&ctl);
+	logger_close(&ctl);
+	return EXIT_SUCCESS;
+}