diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | vlogger.8 | 138 | ||||
| -rw-r--r-- | vlogger.c | 111 |
4 files changed, 252 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore index ed231ec..2440471 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,3 @@ halt pause +vlogger diff --git a/Makefile b/Makefile index a21e5c9..001c17b 100644 --- a/Makefile +++ b/Makefile @@ -4,6 +4,7 @@ SCRIPTS= 1 2 3 ctrlaltdel all: $(CC) $(CFLAGS) halt.c -o halt $(LDFLAGS) $(CC) $(CFLAGS) pause.c -o pause $(LDFLAGS) + $(CC) $(CFLAGS) vlogger.c -o vlogger $(LDFLAGS) install: install -d ${DESTDIR}/${PREFIX}/sbin @@ -22,6 +23,7 @@ install: install -m644 shutdown.8 ${DESTDIR}/${PREFIX}/share/man/man8 install -m644 halt.8 ${DESTDIR}/${PREFIX}/share/man/man8 install -m644 modules-load.8 ${DESTDIR}/${PREFIX}/share/man/man8 + install -m644 vlogger.8 ${DESTDIR}/${PREFIX}/share/man/man8 ln -sf halt.8 ${DESTDIR}/${PREFIX}/share/man/man8/poweroff.8 ln -sf halt.8 ${DESTDIR}/${PREFIX}/share/man/man8/reboot.8 install -d ${DESTDIR}/etc/sv diff --git a/vlogger.8 b/vlogger.8 new file mode 100644 index 0000000..2f46fcd --- /dev/null +++ b/vlogger.8 @@ -0,0 +1,138 @@ +.Dd March 1, 2017 +.Dt VLOGGER 8 +.Os Linux +.Sh NAME +.Nm vlogger +.Nd log messages to syslog or an arbitrary executable +.Sh SYNOPSIS +.Nm vlogger +.Op Fl p Ar priority +.Op Fl t Ar tag +.Sh DESCRIPTION +By default, +.Nm +reads lines from +.Dv stdin +and sends them to syslog. +If the file +.Pa /etc/vlogger +exists and is executable it is executed with +.Ar tag +as only argument and replaces +.Nm . +.Pp +If +.Nm +is executed as a log service for runit or another daemontools like +supervision suite it uses the service name as default +.Ar tag . +As example if +.Nm +is linked to +.Dv /var/service/foo/log/run +it uses +.Dv foo +as default +.Ar tag . +.Bl -tag -width indent +.It Fl p Ar priority +The. +.Ar priority +can be +.Pa facility.level +or just +.Pa facility . +See +.Sx FACILITIES , +.Sx LEVELS +or +.Xr syslog 3 . +The default is +.Pa daemon.info . +.It Fl t Ar tag +Defines the +.Xr openlog 3 +.Pa ident +which is used as prefix for each log message or passed as first argument to +.Pa /etc/vlogger . +.El +.Sh FACILITIES +.Bl -tag -width 11n -compact +.It auth +.It authpriv +.It cron +.It daemon +.It ftp +.It kern +can not be used from userspace replaced with +.Pa daemon . +.It lpr +.It mail +.It news +.It syslog +.It user +.It uucp +.It local[0-7] +.It security +deprecated synonym for +.Pa auth. +.El +.Sh LEVELS +.Bl -tag -width 11n -compact +.It emerg +.It alert +.It crit +.It err +.It warning +.It notice +.It info +.It debug +.It panic +deprecated synonym for +.Pa emerg . +.It error +deprecated synonym for +.Ar err . +.It warn +deprecated synonym for +.Pa warning . +.El +.Sh FILES +.Bl -tag -width indent +.It /etc/vlogger +An optional executable file that is used to to handle the messages. +It is executed with +.Ar tag +as first argument and replaces the +.Nm +process. +.El +.Sh EXIT STATUS +.Ex -std +.Sh EXAMPLES +.Pa /etc/vlogger : +.Bd -literal -offset indent +#!/bin/sh +exec svlogd /var/log/$1 +.Ed +.Sh SEE ALSO +.Xr logger 1 , +.Xr syslog 3 , +.Xr svlogd 8 +.Sh HISTORY +This program is a replacement for the +.Nm logger +utility provided by +.Nm util-linux . +.Sh AUTHOR +.An Duncan Overbruck Aq Mt mail@duncano.de +.Sh LICENSE +.Nm +is in the public domain. +.Pp +To the extent possible under law, +the creator of this work +has waived all copyright and related or +neighboring rights to this work. +.Pp +.Lk http://creativecommons.org/publicdomain/zero/1.0/ diff --git a/vlogger.c b/vlogger.c new file mode 100644 index 0000000..981b692 --- /dev/null +++ b/vlogger.c @@ -0,0 +1,111 @@ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +typedef struct _code { + const char *const c_name; + int c_val; +} CODE; + +CODE prioritynames[] = { + { "alert", LOG_ALERT }, + { "crit", LOG_CRIT }, + { "debug", LOG_DEBUG }, + { "emerg", LOG_EMERG }, + { "err", LOG_ERR }, + { "error", LOG_ERR }, + { "info", LOG_INFO }, + { "notice", LOG_NOTICE }, + { "panic", LOG_EMERG }, + { "warn", LOG_WARNING }, + { "warning", LOG_WARNING }, + { 0, -1 } +}; + +CODE facilitynames[] = { + { "auth", LOG_AUTH }, + { "authpriv", LOG_AUTHPRIV }, + { "cron", LOG_CRON }, + { "daemon", LOG_DAEMON }, + { "ftp", LOG_FTP }, + { "kern", LOG_KERN }, + { "lpr", LOG_LPR }, + { "mail", LOG_MAIL }, + { "news", LOG_NEWS }, + { "security", LOG_AUTH }, + { "syslog", LOG_SYSLOG }, + { "user", LOG_USER }, + { "uucp", LOG_UUCP }, + { "local0", LOG_LOCAL0 }, + { "local1", LOG_LOCAL1 }, + { "local2", LOG_LOCAL2 }, + { "local3", LOG_LOCAL3 }, + { "local4", LOG_LOCAL4 }, + { "local5", LOG_LOCAL5 }, + { "local6", LOG_LOCAL6 }, + { "local7", LOG_LOCAL7 }, + { 0, -1 } +}; + +static char *tag; + +static void +strpriority(char *s, int *facility, int *level) +{ + char *p; + CODE *cp; + + if ((p = strchr(s, '.'))) { + *p++ = 0; + for (cp = prioritynames; cp->c_name; cp++) { + if (strcmp(cp->c_name, p) == 0) + *level = cp->c_val; + } + } + if (*s) + for (cp = facilitynames; cp->c_name; cp++) { + if (strcmp(cp->c_name, s) == 0) + *facility = cp->c_val; + } +} + +int +main(int argc, char *argv[]) +{ + char c, *p; + int facility = LOG_DAEMON; + int level = LOG_INFO; + + if (((p = strrchr(*argv, '/')) && !strncmp(p+1, "run", 3)) && + (*p = 0, (p = strrchr(*argv, '/')) && !strncmp(p+1, "log", 3)) && + (*p = 0, (p = strrchr(*argv, '/'))) != 0) { + tag = strdup(p+1); + } + + while ((c = getopt(argc, argv, "p:t:")) != -1) + switch (c) { + case 'p': strpriority(optarg, &facility, &level); break; + case 't': tag = optarg; break; + default: + fprintf(stderr, "usage: vlogger [-p priority] [-t tag]\n"); + exit(1); + } + + if (access("/etc/vlogger", X_OK) != -1) + execl("/etc/vlogger", "/etc/vlogger", tag, (char *)0); + + openlog(tag, 0, facility); + + char *line; + size_t linelen = 0; + ssize_t rd; + while ((rd = getline(&line, &linelen, stdin)) != -1) { + if (line[rd-1] == '\n') + line[rd-1] = 0; + syslog(level|facility, "%s", line); + } + + return 1; +} |