427 lines
10 KiB
C
427 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)logger.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <err.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define SYSLOG_NAMES
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#include <syslog.h>
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#define sstosa(ss) ((struct sockaddr *)(void *)ss)
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struct socks {
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int sk_sock;
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int sk_addrlen;
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struct sockaddr_storage sk_addr;
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};
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static int decode(char *, const CODE *);
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static int pencode(char *);
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static ssize_t socksetup(const char *, const char *, const char *,
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struct socks **);
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static void logmessage(int, const char *, const char *, const char *,
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struct socks *, ssize_t, const char *);
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static void usage(void);
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#ifdef INET6
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static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
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#else
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static int family = PF_INET; /* protocol family (IPv4 only) */
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#endif
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static int send_to_all = 0; /* send message to all IPv4/IPv6 addresses */
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/*
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* logger -- read and log utility
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*
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* Reads from an input and arranges to write the result on the system
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* log.
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*/
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int
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main(int argc, char *argv[])
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{
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struct socks *socks;
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ssize_t nsock;
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time_t now;
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int ch, logflags, pri;
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char *tag, *host, buf[1024], *timestamp, tbuf[26],
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*hostname, hbuf[MAXHOSTNAMELEN];
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const char *svcname, *src;
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tag = NULL;
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host = NULL;
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hostname = NULL;
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svcname = "syslog";
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src = NULL;
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socks = NULL;
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pri = LOG_USER | LOG_NOTICE;
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logflags = 0;
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unsetenv("TZ");
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while ((ch = getopt(argc, argv, "46Af:H:h:iP:p:S:st:")) != -1)
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switch((char)ch) {
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case '4':
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family = PF_INET;
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break;
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#ifdef INET6
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case '6':
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family = PF_INET6;
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break;
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#endif
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case 'A':
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send_to_all++;
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break;
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case 'f': /* file to log */
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if (freopen(optarg, "r", stdin) == NULL)
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err(1, "%s", optarg);
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setvbuf(stdin, 0, _IONBF, 0);
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break;
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case 'H': /* hostname to set in message header */
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hostname = optarg;
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break;
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case 'h': /* hostname to deliver to */
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host = optarg;
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break;
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case 'i': /* log process id also */
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logflags |= LOG_PID;
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break;
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case 'P': /* service name or port number */
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svcname = optarg;
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break;
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case 'p': /* priority */
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pri = pencode(optarg);
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break;
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case 's': /* log to standard error */
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logflags |= LOG_PERROR;
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break;
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case 'S': /* source address */
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src = optarg;
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break;
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case 't': /* tag */
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tag = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (host) {
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nsock = socksetup(src, host, svcname, &socks);
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if (nsock <= 0)
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errx(1, "socket");
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} else {
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if (src)
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errx(1, "-h option is missing.");
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nsock = 0;
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}
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if (tag == NULL)
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tag = getlogin();
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/* setup for logging */
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if (host == NULL)
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openlog(tag, logflags, 0);
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(void) fclose(stdout);
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(void )time(&now);
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(void )ctime_r(&now, tbuf);
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tbuf[19] = '\0';
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timestamp = tbuf + 4;
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if (hostname == NULL) {
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hostname = hbuf;
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(void )gethostname(hbuf, MAXHOSTNAMELEN);
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*strchrnul(hostname, '.') = '\0';
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}
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/* log input line if appropriate */
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if (argc > 0) {
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char *p, *endp;
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size_t len;
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for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
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len = strlen(*argv);
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if (p + len > endp && p > buf) {
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logmessage(pri, timestamp, hostname, tag,
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socks, nsock, buf);
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p = buf;
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}
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if (len > sizeof(buf) - 1)
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logmessage(pri, timestamp, hostname, tag,
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socks, nsock, *argv++);
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else {
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if (p != buf)
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*p++ = ' ';
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bcopy(*argv++, p, len);
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*(p += len) = '\0';
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}
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}
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if (p != buf)
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logmessage(pri, timestamp, hostname, tag, socks, nsock,
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buf);
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} else
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while (fgets(buf, sizeof(buf), stdin) != NULL)
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logmessage(pri, timestamp, hostname, tag, socks, nsock,
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buf);
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exit(0);
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}
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static ssize_t
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socksetup(const char *src, const char *dst, const char *svcname,
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struct socks **socks)
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{
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struct addrinfo hints, *res, *res0;
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struct sockaddr_storage *ss_src[AF_MAX];
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struct socks *sk;
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ssize_t nsock = 0;
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int error, maxs;
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memset(&ss_src[0], 0, sizeof(ss_src));
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if (src) {
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char *p, *p0, *hs, *hbuf, *sbuf;
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hbuf = sbuf = NULL;
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p0 = p = strdup(src);
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if (p0 == NULL)
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err(1, "strdup failed");
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hs = p0; /* point to search ":" */
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#ifdef INET6
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/* -S option supports IPv6 addr in "[2001:db8::1]:service". */
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if (*p0 == '[') {
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p = strchr(p0, ']');
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if (p == NULL)
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errx(1, "\"]\" not found in src addr");
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*p = '\0';
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/* hs points just after ']' (':' or '\0'). */
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hs = p + 1;
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/*
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* p points just after '[' while it points hs
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* in the case of [].
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*/
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p = ((p0 + 1) == (hs - 1)) ? hs : p0 + 1;
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}
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#endif
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if (*p != '\0') {
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/* (p == hs) means ":514" or "[]:514". */
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hbuf = (p == hs && *p == ':') ? NULL : p;
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p = strchr(hs, ':');
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if (p != NULL) {
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*p = '\0';
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sbuf = (*(p + 1) != '\0') ? p + 1 : NULL;
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}
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}
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hints = (struct addrinfo){
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.ai_family = family,
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.ai_socktype = SOCK_DGRAM,
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.ai_flags = AI_PASSIVE
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};
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error = getaddrinfo(hbuf, sbuf, &hints, &res0);
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if (error)
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errx(1, "%s: %s", gai_strerror(error), src);
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for (res = res0; res; res = res->ai_next) {
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switch (res->ai_family) {
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case AF_INET:
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#ifdef INET6
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case AF_INET6:
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#endif
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if (ss_src[res->ai_family] != NULL)
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continue;
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ss_src[res->ai_family] =
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malloc(sizeof(struct sockaddr_storage));
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if (ss_src[res->ai_family] == NULL)
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err(1, "malloc failed");
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memcpy(ss_src[res->ai_family], res->ai_addr,
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res->ai_addrlen);
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}
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}
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freeaddrinfo(res0);
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free(p0);
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}
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/* resolve hostname */
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hints = (struct addrinfo){
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.ai_family = family,
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.ai_socktype = SOCK_DGRAM
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};
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error = getaddrinfo(dst, svcname, &hints, &res0);
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if (error == EAI_SERVICE) {
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warnx("%s/udp: unknown service", svcname);
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error = getaddrinfo(dst, "514", &hints, &res);
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}
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if (error)
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errx(1, "%s: %s", gai_strerror(error), dst);
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/* count max number of sockets we may open */
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maxs = 0;
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for (res = res0; res; res = res->ai_next)
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maxs++;
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sk = calloc(maxs, sizeof(*sk));
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if (sk == NULL)
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errx(1, "couldn't allocate memory for sockets");
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for (res = res0; res; res = res->ai_next) {
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int s;
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s = socket(res->ai_family, res->ai_socktype,
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res->ai_protocol);
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if (s < 0)
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continue;
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if (src && ss_src[res->ai_family] == NULL)
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errx(1, "address family mismatch");
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if (ss_src[res->ai_family]) {
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error = bind(s, sstosa(ss_src[res->ai_family]),
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ss_src[res->ai_family]->ss_len);
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if (error < 0)
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err(1, "bind");
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}
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sk[nsock] = (struct socks){
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.sk_addrlen = res->ai_addrlen,
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.sk_sock = s
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};
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memcpy(&sk[nsock].sk_addr, res->ai_addr, res->ai_addrlen);
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nsock++;
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}
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freeaddrinfo(res0);
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*socks = sk;
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return (nsock);
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}
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/*
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* Send the message to syslog, either on the local host, or on a remote host
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*/
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static void
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logmessage(int pri, const char *timestamp, const char *hostname,
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const char *tag, struct socks *sk, ssize_t nsock, const char *buf)
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{
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char *line;
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int len, i, lsent;
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if (nsock == 0) {
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syslog(pri, "%s", buf);
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return;
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}
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if ((len = asprintf(&line, "<%d>%s %s %s: %s", pri, timestamp,
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hostname, tag, buf)) == -1)
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errx(1, "asprintf");
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lsent = -1;
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for (i = 0; i < nsock; i++) {
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lsent = sendto(sk[i].sk_sock, line, len, 0,
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sstosa(&sk[i].sk_addr), sk[i].sk_addrlen);
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if (lsent == len && !send_to_all)
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break;
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}
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if (lsent != len) {
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if (lsent == -1)
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warn("sendto");
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else
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warnx("sendto: short send - %d bytes", lsent);
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}
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free(line);
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}
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/*
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* Decode a symbolic name to a numeric value
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*/
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static int
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pencode(char *s)
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{
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char *save;
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int fac, lev;
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for (save = s; *s && *s != '.'; ++s);
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if (*s) {
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*s = '\0';
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fac = decode(save, facilitynames);
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if (fac < 0)
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errx(1, "unknown facility name: %s", save);
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*s++ = '.';
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}
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else {
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fac = 0;
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s = save;
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}
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lev = decode(s, prioritynames);
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if (lev < 0)
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errx(1, "unknown priority name: %s", save);
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return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
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}
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static int
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decode(char *name, const CODE *codetab)
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{
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const CODE *c;
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if (isdigit(*name))
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return (atoi(name));
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for (c = codetab; c->c_name; c++)
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if (!strcasecmp(name, c->c_name))
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return (c->c_val);
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return (-1);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s\n",
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"logger [-46Ais] [-f file] [-h host] [-P port] [-p pri] [-t tag]\n"
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" [-S addr:port] [message ...]"
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);
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exit(1);
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}
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