/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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. 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 */
#if 0
#ifndef lint
static char sccsid[] = "@(#)logger.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
#include <sys/capsicum.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <libcasper.h>
#include <casper/cap_syslog.h>
#define SYSLOG_NAMES
#include <syslog.h>
#define sstosa(ss) ((struct sockaddr *)(void *)ss)
struct socks {
int sk_sock;
int sk_addrlen;
struct sockaddr_storage sk_addr;
};
static int decode(char *, const CODE *);
static int pencode(char *);
static ssize_t socksetup(const char *, const char *, const char *,
struct socks **);
static void logmessage(int, const char *, const char *, const char *,
struct socks *, ssize_t, const char *);
static void usage(void);
static cap_channel_t *capsyslog;
#ifdef INET6
static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
#else
static int family = PF_INET; /* protocol family (IPv4 only) */
#endif
static 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[])
{
cap_channel_t *capcas;
struct socks *socks;
ssize_t nsock;
time_t now;
int ch, logflags, pri;
char *tag, *host, buf[1024], *timestamp, tbuf[26],
*hostname, hbuf[MAXHOSTNAMELEN], *pristr;
const char *svcname, *src;
tag = NULL;
host = NULL;
hostname = NULL;
svcname = "syslog";
src = NULL;
socks = NULL;
pri = LOG_USER | LOG_NOTICE;
pristr = NULL;
logflags = 0;
unsetenv("TZ");
while ((ch = getopt(argc, argv, "46Af:H:h:iP:p:S: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);
setvbuf(stdin, 0, _IONBF, 0);
break;
case 'H': /* hostname to set in message header */
hostname = optarg;
break;
case 'h': /* hostname to deliver to */
host = optarg;
break;
case 'i': /* log process id also */
logflags |= LOG_PID;
break;
case 'P': /* service name or port number */
svcname = optarg;
break;
case 'p': /* priority */
pristr = optarg;
break;
case 's': /* log to standard error */
logflags |= LOG_PERROR;
break;
case 'S': /* source address */
src = optarg;
break;
case 't': /* tag */
tag = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (host) {
nsock = socksetup(src, host, svcname, &socks);
if (nsock <= 0)
errx(1, "socket");
} else {
if (src)
errx(1, "-h option is missing.");
nsock = 0;
}
capcas = cap_init();
if (capcas == NULL)
err(1, "Unable to contact Casper");
caph_cache_catpages();
caph_cache_tzdata();
if (nsock == 0) {
if (caph_enter_casper() < 0)
err(1, "Unable to enter capability mode");
}
capsyslog = cap_service_open(capcas, "system.syslog");
if (capsyslog == NULL)
err(1, "Unable to open system.syslog service");
cap_close(capcas);
if (pristr != NULL)
pri = pencode(pristr);
if (tag == NULL)
tag = getlogin();
/* setup for logging */
if (host == NULL)
cap_openlog(capsyslog, tag, logflags, 0);
if (hostname == NULL) {
hostname = hbuf;
(void )gethostname(hbuf, MAXHOSTNAMELEN);
*strchrnul(hostname, '.') = '\0';
}
timestamp = tbuf + 4;
/* log input line if appropriate */
if (argc > 0) {
char *p, *endp;
size_t len;
(void )time(&now);
(void )ctime_r(&now, tbuf);
tbuf[19] = '\0';
for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
len = strlen(*argv);
if (p + len > endp && p > buf) {
logmessage(pri, timestamp, hostname, tag,
socks, nsock, buf);
p = buf;
}
if (len > sizeof(buf) - 1)
logmessage(pri, timestamp, hostname, tag,
socks, nsock, *argv++);
else {
if (p != buf)
*p++ = ' ';
bcopy(*argv++, p, len);
*(p += len) = '\0';
}
}
if (p != buf)
logmessage(pri, timestamp, hostname, tag, socks, nsock,
buf);
} else
while (fgets(buf, sizeof(buf), stdin) != NULL) {
(void )time(&now);
(void )ctime_r(&now, tbuf);
tbuf[19] = '\0';
logmessage(pri, timestamp, hostname, tag, socks, nsock,
buf);
}
exit(0);
}
static ssize_t
socksetup(const char *src, const char *dst, const char *svcname,
struct socks **socks)
{
struct addrinfo hints, *res, *res0;
struct sockaddr_storage *ss_src[AF_MAX];
struct socks *sk;
ssize_t nsock = 0;
int error, maxs;
memset(&ss_src[0], 0, sizeof(ss_src));
if (src) {
char *p, *p0, *hs, *hbuf, *sbuf;
hbuf = sbuf = NULL;
p0 = p = strdup(src);
if (p0 == NULL)
err(1, "strdup failed");
hs = p0; /* point to search ":" */
#ifdef INET6
/* -S option supports IPv6 addr in "[2001:db8::1]:service". */
if (*p0 == '[') {
p = strchr(p0, ']');
if (p == NULL)
errx(1, "\"]\" not found in src addr");
*p = '\0';
/* hs points just after ']' (':' or '\0'). */
hs = p + 1;
/*
* p points just after '[' while it points hs
* in the case of [].
*/
p = ((p0 + 1) == (hs - 1)) ? hs : p0 + 1;
}
#endif
if (*p != '\0') {
/* (p == hs) means ":514" or "[]:514". */
hbuf = (p == hs && *p == ':') ? NULL : p;
p = strchr(hs, ':');
if (p != NULL) {
*p = '\0';
sbuf = (*(p + 1) != '\0') ? p + 1 : NULL;
}
}
hints = (struct addrinfo){
.ai_family = family,
.ai_socktype = SOCK_DGRAM,
.ai_flags = AI_PASSIVE
};
error = getaddrinfo(hbuf, sbuf, &hints, &res0);
if (error)
errx(1, "%s: %s", gai_strerror(error), src);
for (res = res0; res; res = res->ai_next) {
switch (res->ai_family) {
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
if (ss_src[res->ai_family] != NULL)
continue;
ss_src[res->ai_family] =
malloc(sizeof(struct sockaddr_storage));
if (ss_src[res->ai_family] == NULL)
err(1, "malloc failed");
memcpy(ss_src[res->ai_family], res->ai_addr,
res->ai_addrlen);
}
}
freeaddrinfo(res0);
free(p0);
}
/* resolve hostname */
hints = (struct addrinfo){
.ai_family = family,
.ai_socktype = SOCK_DGRAM
};
error = getaddrinfo(dst, svcname, &hints, &res0);
if (error == EAI_SERVICE) {
warnx("%s/udp: unknown service", svcname);
error = getaddrinfo(dst, "514", &hints, &res0);
}
if (error)
errx(1, "%s: %s", gai_strerror(error), dst);
/* count max number of sockets we may open */
maxs = 0;
for (res = res0; res; res = res->ai_next)
maxs++;
sk = calloc(maxs, sizeof(*sk));
if (sk == NULL)
errx(1, "couldn't allocate memory for sockets");
for (res = res0; res; res = res->ai_next) {
int s;
s = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (s < 0)
continue;
if (src && ss_src[res->ai_family] == NULL)
errx(1, "address family mismatch");
if (ss_src[res->ai_family]) {
error = bind(s, sstosa(ss_src[res->ai_family]),
ss_src[res->ai_family]->ss_len);
if (error < 0)
err(1, "bind");
}
sk[nsock] = (struct socks){
.sk_addrlen = res->ai_addrlen,
.sk_sock = s
};
memcpy(&sk[nsock].sk_addr, res->ai_addr, res->ai_addrlen);
nsock++;
}
freeaddrinfo(res0);
*socks = sk;
return (nsock);
}
/*
* Send the message to syslog, either on the local host, or on a remote host
*/
static void
logmessage(int pri, const char *timestamp, const char *hostname,
const char *tag, struct socks *sk, ssize_t nsock, const char *buf)
{
char *line;
int len, i, lsent;
if (nsock == 0) {
cap_syslog(capsyslog, pri, "%s", buf);
return;
}
if ((len = asprintf(&line, "<%d>%s %s %s: %s", pri, timestamp,
hostname, tag, buf)) == -1)
errx(1, "asprintf");
lsent = -1;
for (i = 0; i < nsock; i++) {
lsent = sendto(sk[i].sk_sock, line, len, 0,
sstosa(&sk[i].sk_addr), sk[i].sk_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
*/
static 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));
}
static int
decode(char *name, const CODE *codetab)
{
const 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 port] [-p pri] [-t tag]\n"
" [-S addr:port] [message ...]"
);
exit(1);
}
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