FreeBSD-5.3/usr.bin/logger/logger.c
/*
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)logger.c 8.1 (Berkeley) 6/6/93";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/logger/logger.c,v 1.13 2002/09/04 23:29:03 dwmalone Exp $");
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define SYSLOG_NAMES
#include <syslog.h>
int decode(char *, CODE *);
int pencode(char *);
static void logmessage(int, char *, char *);
static void usage(void);
struct socks {
int sock;
int addrlen;
struct sockaddr_storage addr;
};
#ifdef INET6
int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
#else
int family = PF_INET; /* protocol family (IPv4 only) */
#endif
int send_to_all = 0; /* send message to all IPv4/IPv6 addresses */
/*
* 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[])
{
int ch, logflags, pri;
char *tag, *host, buf[1024];
tag = NULL;
host = NULL;
pri = LOG_USER | LOG_NOTICE;
logflags = 0;
unsetenv("TZ");
while ((ch = getopt(argc, argv, "46Af:h:ip:st:")) != -1)
switch((char)ch) {
case '4':
family = PF_INET;
break;
#ifdef INET6
case '6':
family = PF_INET6;
break;
#endif
case 'A':
send_to_all++;
break;
case 'f': /* file to log */
if (freopen(optarg, "r", stdin) == NULL)
err(1, "%s", optarg);
break;
case 'h': /* hostname to deliver to */
host = optarg;
break;
case 'i': /* log process id also */
logflags |= LOG_PID;
break;
case 'p': /* priority */
pri = pencode(optarg);
break;
case 's': /* log to standard error */
logflags |= LOG_PERROR;
break;
case 't': /* tag */
tag = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/* setup for logging */
openlog(tag ? tag : getlogin(), logflags, 0);
(void) fclose(stdout);
/* log input line if appropriate */
if (argc > 0) {
char *p, *endp;
size_t len;
for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
len = strlen(*argv);
if (p + len > endp && p > buf) {
logmessage(pri, host, buf);
p = buf;
}
if (len > sizeof(buf) - 1)
logmessage(pri, host, *argv++);
else {
if (p != buf)
*p++ = ' ';
bcopy(*argv++, p, len);
*(p += len) = '\0';
}
}
if (p != buf)
logmessage(pri, host, buf);
} else
while (fgets(buf, sizeof(buf), stdin) != NULL)
logmessage(pri, host, buf);
exit(0);
}
/*
* Send the message to syslog, either on the local host, or on a remote host
*/
void
logmessage(int pri, char *host, char *buf)
{
static struct socks *socks;
static int nsock = 0;
struct addrinfo hints, *res, *r;
char *line;
int maxs, len, sock, error, i, lsent;
if (host == NULL) {
syslog(pri, "%s", buf);
return;
}
if (nsock <= 0) { /* set up socket stuff */
/* resolve hostname */
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
error = getaddrinfo(host, "syslog", &hints, &res);
if (error == EAI_SERVICE) {
warnx ("syslog/udp: unknown service"); /* not fatal */
error = getaddrinfo(host, "514", &hints, &res);
}
if (error)
errx(1, "%s: %s", gai_strerror(error), host);
/* count max number of sockets we may open */
for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
socks = malloc(maxs * sizeof(struct socks));
if (!socks)
errx(1, "couldn't allocate memory for sockets");
for (r = res; r; r = r->ai_next) {
sock = socket(r->ai_family, r->ai_socktype,
r->ai_protocol);
if (sock < 0)
continue;
memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
socks[nsock].addrlen = r->ai_addrlen;
socks[nsock++].sock = sock;
}
freeaddrinfo(res);
if (nsock <= 0)
errx(1, "socket");
}
if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
errx(1, "asprintf");
for (i = 0; i < nsock; ++i) {
lsent = sendto(socks[i].sock, line, len, 0,
(struct sockaddr *)&socks[i].addr,
socks[i].addrlen);
if (lsent == len && !send_to_all)
break;
}
if (lsent != len) {
if (lsent == -1)
warn ("sendto");
else
warnx ("sendto: short send - %d bytes", lsent);
}
free(line);
}
/*
* Decode a symbolic name to a numeric value
*/
int
pencode(char *s)
{
char *save;
int fac, lev;
for (save = s; *s && *s != '.'; ++s);
if (*s) {
*s = '\0';
fac = decode(save, facilitynames);
if (fac < 0)
errx(1, "unknown facility name: %s", save);
*s++ = '.';
}
else {
fac = 0;
s = save;
}
lev = decode(s, prioritynames);
if (lev < 0)
errx(1, "unknown priority name: %s", save);
return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}
int
decode(char *name, CODE *codetab)
{
CODE *c;
if (isdigit(*name))
return (atoi(name));
for (c = codetab; c->c_name; c++)
if (!strcasecmp(name, c->c_name))
return (c->c_val);
return (-1);
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: %s\n",
"logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]"
);
exit(1);
}