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/* 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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