920 lines
24 KiB
C
920 lines
24 KiB
C
/*
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* Copyright (c) 1983, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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, 1994\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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)lpd.c 8.7 (Berkeley) 5/10/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* lpd -- line printer daemon.
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*
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* Listen for a connection and perform the requested operation.
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* Operations are:
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* \1printer\n
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* check the queue for jobs and print any found.
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* \2printer\n
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* receive a job from another machine and queue it.
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* \3printer [users ...] [jobs ...]\n
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* return the current state of the queue (short form).
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* \4printer [users ...] [jobs ...]\n
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* return the current state of the queue (long form).
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* \5printer person [users ...] [jobs ...]\n
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* remove jobs from the queue.
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*
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* Strategy to maintain protected spooling area:
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* 1. Spooling area is writable only by daemon and spooling group
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* 2. lpr runs setuid root and setgrp spooling group; it uses
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* root to access any file it wants (verifying things before
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* with an access call) and group id to know how it should
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* set up ownership of files in the spooling area.
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* 3. Files in spooling area are owned by root, group spooling
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* group, with mode 660.
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* 4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to
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* access files and printer. Users can't get to anything
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* w/o help of lpq and lprm programs.
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*/
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <signal.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <dirent.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 <sysexits.h>
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#include <ctype.h>
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#include "lp.h"
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#include "lp.local.h"
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#include "pathnames.h"
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#include "extern.h"
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int lflag; /* log requests flag */
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int pflag; /* no incoming port flag */
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int from_remote; /* from remote socket */
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int main(int argc, char **_argv);
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static void reapchild(int _signo);
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static void mcleanup(int _signo);
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static void doit(void);
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static void startup(void);
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static void chkhost(struct sockaddr *_f, int _ch_opts);
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static int ckqueue(struct printer *_pp);
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static void fhosterr(int _dosys, const char *_sysmsg, const char *_usermsg,
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...) __printf0like(3, 4);
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static int *socksetup(int _af, int _debuglvl);
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static void usage(void);
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/* XXX from libc/net/rcmd.c */
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extern int __ivaliduser_sa __P((FILE *, struct sockaddr *, socklen_t,
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const char *, const char *));
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uid_t uid, euid;
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#define LPD_NOPORTCHK 0001 /* skip reserved-port check */
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#define LPD_LOGCONNERR 0002 /* (sys)log connection errors */
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int
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main(int argc, char **argv)
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{
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int ch_options, errs, f, funix, *finet, i, lfd, socket_debug;
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fd_set defreadfds;
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struct sockaddr_un un, fromunix;
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struct sockaddr_storage frominet;
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socklen_t fromlen;
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sigset_t omask, nmask;
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struct servent *sp, serv;
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int inet_flag = 0, inet6_flag = 0;
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euid = geteuid(); /* these shouldn't be different */
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uid = getuid();
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ch_options = 0;
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socket_debug = 0;
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gethostname(local_host, sizeof(local_host));
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progname = "lpd";
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if (euid != 0)
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errx(EX_NOPERM,"must run as root");
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errs = 0;
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while ((i = getopt(argc, argv, "cdlpwW46")) != -1)
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switch (i) {
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case 'c':
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/* log all kinds of connection-errors to syslog */
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ch_options |= LPD_LOGCONNERR;
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break;
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case 'd':
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socket_debug++;
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break;
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case 'l':
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lflag++;
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break;
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case 'p':
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pflag++;
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break;
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case 'w': /* netbsd uses -w for maxwait */
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/*
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* This will be removed after the release of 4.4, as
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* it conflicts with -w in netbsd's lpd. For now it
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* is just a warning, so we won't suddenly break lpd
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* for anyone who is currently using the option.
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*/
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syslog(LOG_WARNING,
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"NOTE: the -w option has been renamed -W");
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syslog(LOG_WARNING,
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"NOTE: please change your lpd config to use -W");
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/* FALLTHROUGH */
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case 'W':
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/* allow connections coming from a non-reserved port */
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/* (done by some lpr-implementations for MS-Windows) */
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ch_options |= LPD_NOPORTCHK;
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break;
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case '4':
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family = PF_INET;
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inet_flag++;
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break;
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case '6':
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#ifdef INET6
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family = PF_INET6;
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inet6_flag++;
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#else
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errx(EX_USAGE, "lpd compiled sans INET6 (IPv6 support)");
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#endif
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break;
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/*
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* The following options are not in FreeBSD (yet?), but are
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* listed here to "reserve" them, because the option-letters
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* are used by either NetBSD or OpenBSD (as of July 2001).
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*/
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case 'b': /* set bind-addr */
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case 'n': /* set max num of children */
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case 'r': /* allow 'of' for remote ptrs */
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/* ...[not needed in freebsd] */
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case 's': /* secure (no inet), same as -p */
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/* FALLTHROUGH */
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default:
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errs++;
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}
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if (inet_flag && inet6_flag)
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family = PF_UNSPEC;
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argc -= optind;
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argv += optind;
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if (errs)
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usage();
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if (argc == 1) {
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if ((i = atoi(argv[0])) == 0)
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usage();
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if (i < 0 || i > USHRT_MAX)
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errx(EX_USAGE, "port # %d is invalid", i);
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serv.s_port = htons(i);
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sp = &serv;
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argc--;
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} else {
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sp = getservbyname("printer", "tcp");
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if (sp == NULL)
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errx(EX_OSFILE, "printer/tcp: unknown service");
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}
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if (argc != 0)
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usage();
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/*
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* We run chkprintcap right away to catch any errors and blat them
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* to stderr while we still have it open, rather than sending them
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* to syslog and leaving the user wondering why lpd started and
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* then stopped. There should probably be a command-line flag to
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* ignore errors from chkprintcap.
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*/
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{
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pid_t pid;
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int status;
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pid = fork();
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if (pid < 0) {
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err(EX_OSERR, "cannot fork");
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} else if (pid == 0) { /* child */
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execl(_PATH_CHKPRINTCAP, _PATH_CHKPRINTCAP, (char *)0);
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err(EX_OSERR, "cannot execute %s", _PATH_CHKPRINTCAP);
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}
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if (waitpid(pid, &status, 0) < 0) {
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err(EX_OSERR, "cannot wait");
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
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errx(EX_OSFILE, "%d errors in printcap file, exiting",
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WEXITSTATUS(status));
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}
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#ifndef DEBUG
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/*
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* Set up standard environment by detaching from the parent.
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*/
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daemon(0, 0);
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#endif
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openlog("lpd", LOG_PID, LOG_LPR);
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syslog(LOG_INFO, "lpd startup: logging=%d%s", lflag,
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socket_debug ? " dbg" : "");
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(void) umask(0);
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/*
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* NB: This depends on O_NONBLOCK semantics doing the right thing;
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* i.e., applying only to the O_EXLOCK and not to the rest of the
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* open/creation. As of 1997-12-02, this is the case for commonly-
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* used filesystems. There are other places in this code which
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* make the same assumption.
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*/
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lfd = open(_PATH_MASTERLOCK, O_WRONLY|O_CREAT|O_EXLOCK|O_NONBLOCK,
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LOCK_FILE_MODE);
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if (lfd < 0) {
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if (errno == EWOULDBLOCK) /* active deamon present */
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exit(0);
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syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
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exit(1);
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}
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fcntl(lfd, F_SETFL, 0); /* turn off non-blocking mode */
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ftruncate(lfd, 0);
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/*
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* write process id for others to know
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*/
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sprintf(line, "%u\n", getpid());
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f = strlen(line);
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if (write(lfd, line, f) != f) {
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syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
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exit(1);
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}
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signal(SIGCHLD, reapchild);
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/*
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* Restart all the printers.
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*/
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startup();
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(void) unlink(_PATH_SOCKETNAME);
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funix = socket(AF_UNIX, SOCK_STREAM, 0);
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if (funix < 0) {
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syslog(LOG_ERR, "socket: %m");
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exit(1);
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}
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sigemptyset(&nmask);
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sigaddset(&nmask, SIGHUP);
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sigaddset(&nmask, SIGINT);
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sigaddset(&nmask, SIGQUIT);
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sigaddset(&nmask, SIGTERM);
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sigprocmask(SIG_BLOCK, &nmask, &omask);
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(void) umask(07);
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signal(SIGHUP, mcleanup);
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signal(SIGINT, mcleanup);
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signal(SIGQUIT, mcleanup);
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signal(SIGTERM, mcleanup);
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memset(&un, 0, sizeof(un));
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un.sun_family = AF_UNIX;
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strcpy(un.sun_path, _PATH_SOCKETNAME);
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#ifndef SUN_LEN
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#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
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#endif
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if (bind(funix, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
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syslog(LOG_ERR, "ubind: %m");
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exit(1);
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}
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(void) umask(0);
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sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
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FD_ZERO(&defreadfds);
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FD_SET(funix, &defreadfds);
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listen(funix, 5);
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if (pflag == 0) {
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finet = socksetup(family, socket_debug);
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} else
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finet = NULL; /* pretend we couldn't open TCP socket. */
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if (finet) {
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for (i = 1; i <= *finet; i++) {
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FD_SET(finet[i], &defreadfds);
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listen(finet[i], 5);
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}
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}
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/*
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* Main loop: accept, do a request, continue.
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*/
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memset(&frominet, 0, sizeof(frominet));
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memset(&fromunix, 0, sizeof(fromunix));
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if (lflag)
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syslog(LOG_INFO, "lpd startup: ready to accept requests");
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/*
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* XXX - should be redone for multi-protocol
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*/
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for (;;) {
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int domain, nfds, s;
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fd_set readfds;
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FD_COPY(&defreadfds, &readfds);
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nfds = select(20, &readfds, 0, 0, 0);
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if (nfds <= 0) {
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if (nfds < 0 && errno != EINTR)
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syslog(LOG_WARNING, "select: %m");
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continue;
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}
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domain = -1; /* avoid compile-time warning */
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s = -1; /* avoid compile-time warning */
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if (FD_ISSET(funix, &readfds)) {
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domain = AF_UNIX, fromlen = sizeof(fromunix);
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s = accept(funix,
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(struct sockaddr *)&fromunix, &fromlen);
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} else {
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for (i = 1; i <= *finet; i++)
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if (FD_ISSET(finet[i], &readfds)) {
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domain = AF_INET;
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fromlen = sizeof(frominet);
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s = accept(finet[i],
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(struct sockaddr *)&frominet,
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&fromlen);
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}
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}
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if (s < 0) {
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if (errno != EINTR)
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syslog(LOG_WARNING, "accept: %m");
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continue;
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}
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if (fork() == 0) {
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/*
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* Note that printjob() also plays around with
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* signal-handling routines, and may need to be
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* changed when making changes to signal-handling.
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*/
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signal(SIGCHLD, SIG_DFL);
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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(void) close(funix);
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if (pflag == 0 && finet) {
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for (i = 1; i <= *finet; i++)
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(void)close(finet[i]);
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}
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dup2(s, 1);
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(void) close(s);
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if (domain == AF_INET) {
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/* for both AF_INET and AF_INET6 */
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from_remote = 1;
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chkhost((struct sockaddr *)&frominet,
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ch_options);
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} else
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from_remote = 0;
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doit();
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exit(0);
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}
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(void) close(s);
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}
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}
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static void
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reapchild(int signo __unused)
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{
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union wait status;
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while (wait3((int *)&status, WNOHANG, 0) > 0)
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;
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}
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static void
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mcleanup(int signo)
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{
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/*
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* XXX syslog(3) is not signal-safe.
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*/
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if (lflag) {
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if (signo)
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syslog(LOG_INFO, "exiting on signal %d", signo);
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else
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syslog(LOG_INFO, "exiting");
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}
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unlink(_PATH_SOCKETNAME);
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exit(0);
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}
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/*
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* Stuff for handling job specifications
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*/
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char *user[MAXUSERS]; /* users to process */
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int users; /* # of users in user array */
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int requ[MAXREQUESTS]; /* job number of spool entries */
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int requests; /* # of spool requests */
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char *person; /* name of person doing lprm */
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/* buffer to hold the client's machine-name */
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static char frombuf[MAXHOSTNAMELEN];
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char cbuf[BUFSIZ]; /* command line buffer */
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const char *cmdnames[] = {
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"null",
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"printjob",
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"recvjob",
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"displayq short",
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"displayq long",
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"rmjob"
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};
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static void
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doit(void)
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{
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char *cp, *printer;
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int n;
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int status;
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struct printer myprinter, *pp = &myprinter;
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init_printer(&myprinter);
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for (;;) {
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cp = cbuf;
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do {
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if (cp >= &cbuf[sizeof(cbuf) - 1])
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fatal(0, "Command line too long");
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if ((n = read(STDOUT_FILENO, cp, 1)) != 1) {
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if (n < 0)
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fatal(0, "Lost connection");
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return;
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}
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} while (*cp++ != '\n');
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*--cp = '\0';
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cp = cbuf;
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if (lflag) {
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if (*cp >= '\1' && *cp <= '\5')
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syslog(LOG_INFO, "%s requests %s %s",
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from_host, cmdnames[(u_char)*cp], cp+1);
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else
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syslog(LOG_INFO, "bad request (%d) from %s",
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*cp, from_host);
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}
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switch (*cp++) {
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case CMD_CHECK_QUE: /* check the queue, print any jobs there */
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startprinting(cp);
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break;
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case CMD_TAKE_THIS: /* receive files to be queued */
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if (!from_remote) {
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syslog(LOG_INFO, "illegal request (%d)", *cp);
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exit(1);
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}
|
|
recvjob(cp);
|
|
break;
|
|
case CMD_SHOWQ_SHORT: /* display the queue (short form) */
|
|
case CMD_SHOWQ_LONG: /* display the queue (long form) */
|
|
/* XXX - this all needs to be redone. */
|
|
printer = cp;
|
|
while (*cp) {
|
|
if (*cp != ' ') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
*cp++ = '\0';
|
|
while (isspace(*cp))
|
|
cp++;
|
|
if (*cp == '\0')
|
|
break;
|
|
if (isdigit(*cp)) {
|
|
if (requests >= MAXREQUESTS)
|
|
fatal(0, "Too many requests");
|
|
requ[requests++] = atoi(cp);
|
|
} else {
|
|
if (users >= MAXUSERS)
|
|
fatal(0, "Too many users");
|
|
user[users++] = cp;
|
|
}
|
|
}
|
|
status = getprintcap(printer, pp);
|
|
if (status < 0)
|
|
fatal(pp, "%s", pcaperr(status));
|
|
displayq(pp, cbuf[0] == CMD_SHOWQ_LONG);
|
|
exit(0);
|
|
case CMD_RMJOB: /* remove a job from the queue */
|
|
if (!from_remote) {
|
|
syslog(LOG_INFO, "illegal request (%d)", *cp);
|
|
exit(1);
|
|
}
|
|
printer = cp;
|
|
while (*cp && *cp != ' ')
|
|
cp++;
|
|
if (!*cp)
|
|
break;
|
|
*cp++ = '\0';
|
|
person = cp;
|
|
while (*cp) {
|
|
if (*cp != ' ') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
*cp++ = '\0';
|
|
while (isspace(*cp))
|
|
cp++;
|
|
if (*cp == '\0')
|
|
break;
|
|
if (isdigit(*cp)) {
|
|
if (requests >= MAXREQUESTS)
|
|
fatal(0, "Too many requests");
|
|
requ[requests++] = atoi(cp);
|
|
} else {
|
|
if (users >= MAXUSERS)
|
|
fatal(0, "Too many users");
|
|
user[users++] = cp;
|
|
}
|
|
}
|
|
rmjob(printer);
|
|
break;
|
|
}
|
|
fatal(0, "Illegal service request");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make a pass through the printcap database and start printing any
|
|
* files left from the last time the machine went down.
|
|
*/
|
|
static void
|
|
startup(void)
|
|
{
|
|
int pid, status, more;
|
|
struct printer myprinter, *pp = &myprinter;
|
|
|
|
more = firstprinter(pp, &status);
|
|
if (status)
|
|
goto errloop;
|
|
while (more) {
|
|
if (ckqueue(pp) <= 0) {
|
|
goto next;
|
|
}
|
|
if (lflag)
|
|
syslog(LOG_INFO, "lpd startup: work for %s",
|
|
pp->printer);
|
|
if ((pid = fork()) < 0) {
|
|
syslog(LOG_WARNING, "lpd startup: cannot fork for %s",
|
|
pp->printer);
|
|
mcleanup(0);
|
|
}
|
|
if (pid == 0) {
|
|
lastprinter();
|
|
printjob(pp);
|
|
/* NOTREACHED */
|
|
}
|
|
do {
|
|
next:
|
|
more = nextprinter(pp, &status);
|
|
errloop:
|
|
if (status)
|
|
syslog(LOG_WARNING,
|
|
"lpd startup: printcap entry for %s has errors, skipping",
|
|
pp->printer ? pp->printer : "<noname?>");
|
|
} while (more && status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure there's some work to do before forking off a child
|
|
*/
|
|
static int
|
|
ckqueue(struct printer *pp)
|
|
{
|
|
register struct dirent *d;
|
|
DIR *dirp;
|
|
char *spooldir;
|
|
|
|
spooldir = pp->spool_dir;
|
|
if ((dirp = opendir(spooldir)) == NULL)
|
|
return (-1);
|
|
while ((d = readdir(dirp)) != NULL) {
|
|
if (d->d_name[0] != 'c' || d->d_name[1] != 'f')
|
|
continue; /* daemon control files only */
|
|
closedir(dirp);
|
|
return (1); /* found something */
|
|
}
|
|
closedir(dirp);
|
|
return (0);
|
|
}
|
|
|
|
#define DUMMY ":nobody::"
|
|
|
|
/*
|
|
* Check to see if the host connecting to this host has access to any
|
|
* lpd services on this host.
|
|
*/
|
|
static void
|
|
chkhost(struct sockaddr *f, int ch_opts)
|
|
{
|
|
struct addrinfo hints, *res, *r;
|
|
register FILE *hostf;
|
|
char hostbuf[NI_MAXHOST], ip[NI_MAXHOST];
|
|
char serv[NI_MAXSERV];
|
|
int error, errsav, fpass, good, wantsl;
|
|
|
|
wantsl = 0;
|
|
if (ch_opts & LPD_LOGCONNERR)
|
|
wantsl = 1; /* also syslog the errors */
|
|
|
|
from_host = ".na.";
|
|
|
|
/* Need real hostname for temporary filenames */
|
|
error = getnameinfo(f, f->sa_len, hostbuf, sizeof(hostbuf), NULL, 0,
|
|
NI_NAMEREQD);
|
|
if (error) {
|
|
errsav = error;
|
|
error = getnameinfo(f, f->sa_len, hostbuf, sizeof(hostbuf),
|
|
NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID);
|
|
if (error)
|
|
fhosterr(wantsl,
|
|
"can not determine hostname for remote host (%d)",
|
|
"Host name for your address not known", error);
|
|
else
|
|
fhosterr(wantsl,
|
|
"Host name for remote host (%s) not known (%d)",
|
|
"Host name for your address (%s) not known",
|
|
hostbuf, errsav);
|
|
}
|
|
|
|
strlcpy(frombuf, hostbuf, sizeof(frombuf));
|
|
from_host = frombuf;
|
|
|
|
/* Need address in stringform for comparison (no DNS lookup here) */
|
|
error = getnameinfo(f, f->sa_len, hostbuf, sizeof(hostbuf), NULL, 0,
|
|
NI_NUMERICHOST | NI_WITHSCOPEID);
|
|
if (error)
|
|
fhosterr(wantsl, "Cannot print IP address (error %d)",
|
|
"Cannot print IP address", error);
|
|
from_ip = strdup(hostbuf);
|
|
|
|
/* Reject numeric addresses */
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = family;
|
|
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
|
|
if (getaddrinfo(from_host, NULL, &hints, &res) == 0) {
|
|
freeaddrinfo(res);
|
|
fhosterr(wantsl, NULL, "reverse lookup results in non-FQDN %s",
|
|
from_host);
|
|
}
|
|
|
|
/* Check for spoof, ala rlogind */
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = family;
|
|
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
error = getaddrinfo(from_host, NULL, &hints, &res);
|
|
if (error) {
|
|
fhosterr(wantsl, "dns lookup for address %s failed: %s",
|
|
"hostname for your address (%s) unknown: %s", from_ip,
|
|
gai_strerror(error));
|
|
}
|
|
good = 0;
|
|
for (r = res; good == 0 && r; r = r->ai_next) {
|
|
error = getnameinfo(r->ai_addr, r->ai_addrlen, ip, sizeof(ip),
|
|
NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID);
|
|
if (!error && !strcmp(from_ip, ip))
|
|
good = 1;
|
|
}
|
|
if (res)
|
|
freeaddrinfo(res);
|
|
if (good == 0)
|
|
fhosterr(wantsl, "address for remote host (%s) not matched",
|
|
"address for your hostname (%s) not matched", from_ip);
|
|
|
|
fpass = 1;
|
|
hostf = fopen(_PATH_HOSTSEQUIV, "r");
|
|
again:
|
|
if (hostf) {
|
|
if (__ivaliduser_sa(hostf, f, f->sa_len, DUMMY, DUMMY) == 0) {
|
|
(void) fclose(hostf);
|
|
goto foundhost;
|
|
}
|
|
(void) fclose(hostf);
|
|
}
|
|
if (fpass == 1) {
|
|
fpass = 2;
|
|
hostf = fopen(_PATH_HOSTSLPD, "r");
|
|
goto again;
|
|
}
|
|
fhosterr(wantsl, "refused connection from %s, sip=%s",
|
|
"Print-services are not available to your host (%s).", from_host,
|
|
from_ip);
|
|
/*NOTREACHED*/
|
|
|
|
foundhost:
|
|
if (ch_opts & LPD_NOPORTCHK)
|
|
return; /* skip the reserved-port check */
|
|
|
|
error = getnameinfo(f, f->sa_len, NULL, 0, serv, sizeof(serv),
|
|
NI_NUMERICSERV);
|
|
if (error)
|
|
fhosterr(wantsl, NULL, "malformed from-address (%d)", error);
|
|
|
|
if (atoi(serv) >= IPPORT_RESERVED)
|
|
fhosterr(wantsl, NULL, "connected from invalid port (%s)",
|
|
serv);
|
|
}
|
|
|
|
#include <stdarg.h>
|
|
/*
|
|
* Handle fatal errors in chkhost. The first message will optionally be sent
|
|
* to syslog, the second one is sent to the connecting host. If the first
|
|
* message is NULL, then the same message is used for both. Note that the
|
|
* argument list for both messages are assumed to be the same (or at least
|
|
* the initial arguments for one must be EXACTLY the same as the complete
|
|
* argument list for the other message).
|
|
*
|
|
* The idea is that the syslog message is meant for an administrator of a
|
|
* print server (the host receiving connections), while the usermsg is meant
|
|
* for a remote user who may or may not be clueful, and may or may not be
|
|
* doing something nefarious. Some remote users (eg, MS-Windows...) may not
|
|
* even see whatever message is sent, which is why there's the option to
|
|
* start 'lpd' with the connection-errors also sent to syslog.
|
|
*
|
|
* Given that hostnames can theoretically be fairly long (well, over 250
|
|
* bytes), it would probably be helpful to have the 'from_host' field at
|
|
* the end of any error messages which include that info.
|
|
*/
|
|
void
|
|
fhosterr(int dosys, const char *sysmsg, const char *usermsg, ...)
|
|
{
|
|
va_list ap;
|
|
char *sbuf, *ubuf;
|
|
const char *testone;
|
|
|
|
va_start(ap, usermsg);
|
|
vasprintf(&ubuf, usermsg, ap);
|
|
va_end(ap);
|
|
|
|
if (dosys) {
|
|
sbuf = ubuf; /* assume sysmsg == NULL */
|
|
if (sysmsg != NULL) {
|
|
va_start(ap, usermsg);
|
|
vasprintf(&sbuf, sysmsg, ap);
|
|
va_end(ap);
|
|
}
|
|
/*
|
|
* If the first variable-parameter is not the 'from_host',
|
|
* then first write THAT information as a line to syslog.
|
|
*/
|
|
va_start(ap, usermsg);
|
|
testone = va_arg(ap, const char *);
|
|
if (testone != from_host) {
|
|
syslog(LOG_WARNING, "for connection from %s:", from_host);
|
|
}
|
|
va_end(ap);
|
|
|
|
/* now write the syslog message */
|
|
syslog(LOG_WARNING, "%s", sbuf);
|
|
}
|
|
|
|
printf("%s [@%s]: %s\n", progname, local_host, ubuf);
|
|
fflush(stdout);
|
|
|
|
/*
|
|
* Add a minimal delay before exiting (and disconnecting from the
|
|
* sending-host). This is just in case that machine responds by
|
|
* INSTANTLY retrying (and instantly re-failing...). This may also
|
|
* give the other side more time to read the error message.
|
|
*/
|
|
sleep(2); /* a paranoid throttling measure */
|
|
exit(1);
|
|
}
|
|
|
|
/* setup server socket for specified address family */
|
|
/* if af is PF_UNSPEC more than one socket may be returned */
|
|
/* the returned list is dynamically allocated, so caller needs to free it */
|
|
static int *
|
|
socksetup(int af, int debuglvl)
|
|
{
|
|
struct addrinfo hints, *res, *r;
|
|
int error, maxs, *s, *socks;
|
|
const int on = 1;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_flags = AI_PASSIVE;
|
|
hints.ai_family = af;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
error = getaddrinfo(NULL, "printer", &hints, &res);
|
|
if (error) {
|
|
syslog(LOG_ERR, "%s", gai_strerror(error));
|
|
mcleanup(0);
|
|
}
|
|
|
|
/* Count max number of sockets we may open */
|
|
for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
|
|
;
|
|
socks = malloc((maxs + 1) * sizeof(int));
|
|
if (!socks) {
|
|
syslog(LOG_ERR, "couldn't allocate memory for sockets");
|
|
mcleanup(0);
|
|
}
|
|
|
|
*socks = 0; /* num of sockets counter at start of array */
|
|
s = socks + 1;
|
|
for (r = res; r; r = r->ai_next) {
|
|
*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
|
|
if (*s < 0) {
|
|
syslog(LOG_DEBUG, "socket(): %m");
|
|
continue;
|
|
}
|
|
if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))
|
|
< 0) {
|
|
syslog(LOG_ERR, "setsockopt(SO_REUSEADDR): %m");
|
|
close(*s);
|
|
continue;
|
|
}
|
|
if (debuglvl)
|
|
if (setsockopt(*s, SOL_SOCKET, SO_DEBUG, &debuglvl,
|
|
sizeof(debuglvl)) < 0) {
|
|
syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
|
|
close(*s);
|
|
continue;
|
|
}
|
|
#ifdef IPV6_BINDV6ONLY
|
|
if (r->ai_family == AF_INET6) {
|
|
if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY,
|
|
&on, sizeof(on)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt (IPV6_BINDV6ONLY): %m");
|
|
close(*s);
|
|
continue;
|
|
}
|
|
}
|
|
#endif
|
|
if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
|
|
syslog(LOG_DEBUG, "bind(): %m");
|
|
close(*s);
|
|
continue;
|
|
}
|
|
(*socks)++;
|
|
s++;
|
|
}
|
|
|
|
if (res)
|
|
freeaddrinfo(res);
|
|
|
|
if (*socks == 0) {
|
|
syslog(LOG_ERR, "Couldn't bind to any socket");
|
|
free(socks);
|
|
mcleanup(0);
|
|
}
|
|
return(socks);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
#ifdef INET6
|
|
fprintf(stderr, "usage: lpd [-cdlpW46] [port#]\n");
|
|
#else
|
|
fprintf(stderr, "usage: lpd [-cdlpW] [port#]\n");
|
|
#endif
|
|
exit(EX_USAGE);
|
|
}
|