789 lines
19 KiB
C
789 lines
19 KiB
C
/* $NetBSD: lpd.c,v 1.54 2006/01/18 23:17:38 garbled Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1983, 1993, 1994
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1983, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)lpd.c 8.7 (Berkeley) 5/10/95";
|
|
#else
|
|
__RCSID("$NetBSD: lpd.c,v 1.54 2006/01/18 23:17:38 garbled Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* lpd -- line printer daemon.
|
|
*
|
|
* Listen for a connection and perform the requested operation.
|
|
* Operations are:
|
|
* \1printer\n
|
|
* check the queue for jobs and print any found.
|
|
* \2printer\n
|
|
* receive a job from another machine and queue it.
|
|
* \3printer [users ...] [jobs ...]\n
|
|
* return the current state of the queue (short form).
|
|
* \4printer [users ...] [jobs ...]\n
|
|
* return the current state of the queue (long form).
|
|
* \5printer person [users ...] [jobs ...]\n
|
|
* remove jobs from the queue.
|
|
*
|
|
* Strategy to maintain protected spooling area:
|
|
* 1. Spooling area is writable only by daemon and spooling group
|
|
* 2. lpr runs setuid root and setgrp spooling group; it uses
|
|
* root to access any file it wants (verifying things before
|
|
* with an access call) and group id to know how it should
|
|
* set up ownership of files in the spooling area.
|
|
* 3. Files in spooling area are owned by root, group spooling
|
|
* group, with mode 660.
|
|
* 4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to
|
|
* access files and printer. Users can't get to anything
|
|
* w/o help of lpq and lprm programs.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/un.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/file.h>
|
|
#include <sys/poll.h>
|
|
#include <netinet/in.h>
|
|
|
|
#include <err.h>
|
|
#include <netdb.h>
|
|
#include <unistd.h>
|
|
#include <syslog.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <dirent.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#ifdef LIBWRAP
|
|
#include <tcpd.h>
|
|
#endif
|
|
|
|
#include "lp.h"
|
|
#include "lp.local.h"
|
|
#include "pathnames.h"
|
|
#include "extern.h"
|
|
|
|
/* XXX from libc/net/rcmd.c */
|
|
extern int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t,
|
|
const char *, const char *);
|
|
|
|
#ifdef LIBWRAP
|
|
int allow_severity = LOG_AUTH|LOG_INFO;
|
|
int deny_severity = LOG_AUTH|LOG_WARNING;
|
|
#endif
|
|
|
|
int lflag; /* log requests flag */
|
|
int rflag; /* allow of for remote printers */
|
|
int sflag; /* secure (no inet) flag */
|
|
int from_remote; /* from remote socket */
|
|
char **blist; /* list of addresses to bind(2) to */
|
|
int blist_size;
|
|
int blist_addrs;
|
|
|
|
int main(int, char **);
|
|
static void reapchild(int);
|
|
static void mcleanup(int);
|
|
static void doit(void);
|
|
static void startup(void);
|
|
static void chkhost(struct sockaddr *, int);
|
|
static void usage(void);
|
|
static struct pollfd *socksetup(int, int, const char *, int *);
|
|
|
|
uid_t uid, euid;
|
|
int child_count;
|
|
|
|
#define LPD_NOPORTCHK 0001 /* skip reserved-port check */
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct sockaddr_storage frm;
|
|
socklen_t frmlen;
|
|
sigset_t nmask, omask;
|
|
int lfd, errs, i, f, nfds;
|
|
struct pollfd *socks;
|
|
int child_max = 32; /* more than enough to hose the system */
|
|
int options = 0, check_options = 0;
|
|
struct servent *sp;
|
|
const char *port = "printer";
|
|
char **newblist;
|
|
|
|
euid = geteuid(); /* these shouldn't be different */
|
|
uid = getuid();
|
|
gethostname(host, sizeof(host));
|
|
host[sizeof(host) - 1] = '\0';
|
|
setprogname(*argv);
|
|
|
|
errs = 0;
|
|
while ((i = getopt(argc, argv, "b:dln:srw:W")) != -1)
|
|
switch (i) {
|
|
case 'b':
|
|
if (blist_addrs >= blist_size) {
|
|
newblist = realloc(blist,
|
|
blist_size + sizeof(char *) * 4);
|
|
if (newblist == NULL)
|
|
err(1, "cant allocate bind addr list");
|
|
blist = newblist;
|
|
blist_size += sizeof(char *) * 4;
|
|
}
|
|
blist[blist_addrs++] = strdup(optarg);
|
|
break;
|
|
case 'd':
|
|
options |= SO_DEBUG;
|
|
break;
|
|
case 'l':
|
|
lflag++;
|
|
break;
|
|
case 'n':
|
|
child_max = atoi(optarg);
|
|
if (child_max < 0 || child_max > 1024)
|
|
errx(1, "invalid number of children: %s",
|
|
optarg);
|
|
break;
|
|
case 'r':
|
|
rflag++;
|
|
break;
|
|
case 's':
|
|
sflag++;
|
|
break;
|
|
case 'w':
|
|
wait_time = atoi(optarg);
|
|
if (wait_time < 0)
|
|
errx(1, "wait time must be postive: %s",
|
|
optarg);
|
|
if (wait_time < 30)
|
|
warnx("warning: wait time less than 30 seconds");
|
|
break;
|
|
case 'W':/* allow connections coming from a non-reserved port */
|
|
/* (done by some lpr-implementations for MS-Windows) */
|
|
check_options |= LPD_NOPORTCHK;
|
|
break;
|
|
default:
|
|
errs++;
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (errs)
|
|
usage();
|
|
|
|
switch (argc) {
|
|
case 1:
|
|
if ((i = atoi(argv[0])) == 0)
|
|
usage();
|
|
if (i < 0 || i > USHRT_MAX)
|
|
errx(1, "port # %d is invalid", i);
|
|
|
|
port = argv[0];
|
|
break;
|
|
case 0:
|
|
sp = getservbyname(port, "tcp");
|
|
if (sp == NULL)
|
|
errx(1, "%s/tcp: unknown service", port);
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
#ifndef DEBUG
|
|
/*
|
|
* Set up standard environment by detaching from the parent.
|
|
*/
|
|
daemon(0, 0);
|
|
#endif
|
|
|
|
openlog("lpd", LOG_PID, LOG_LPR);
|
|
syslog(LOG_INFO, "restarted");
|
|
(void)umask(0);
|
|
lfd = open(_PATH_MASTERLOCK, O_WRONLY|O_CREAT, 0644);
|
|
if (lfd < 0) {
|
|
syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
|
|
exit(1);
|
|
}
|
|
if (flock(lfd, LOCK_EX|LOCK_NB) < 0) {
|
|
if (errno == EWOULDBLOCK) { /* active daemon present */
|
|
syslog(LOG_ERR, "%s is locked; another lpd is running",
|
|
_PATH_MASTERLOCK);
|
|
exit(0);
|
|
}
|
|
syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
|
|
exit(1);
|
|
}
|
|
ftruncate(lfd, 0);
|
|
/*
|
|
* write process id for others to know
|
|
*/
|
|
(void)snprintf(line, sizeof(line), "%u\n", getpid());
|
|
f = strlen(line);
|
|
if (write(lfd, line, f) != f) {
|
|
syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
|
|
exit(1);
|
|
}
|
|
signal(SIGCHLD, reapchild);
|
|
/*
|
|
* Restart all the printers.
|
|
*/
|
|
startup();
|
|
|
|
sigemptyset(&nmask);
|
|
sigaddset(&nmask, SIGHUP);
|
|
sigaddset(&nmask, SIGINT);
|
|
sigaddset(&nmask, SIGQUIT);
|
|
sigaddset(&nmask, SIGTERM);
|
|
sigprocmask(SIG_BLOCK, &nmask, &omask);
|
|
|
|
signal(SIGHUP, mcleanup);
|
|
signal(SIGINT, mcleanup);
|
|
signal(SIGQUIT, mcleanup);
|
|
signal(SIGTERM, mcleanup);
|
|
|
|
socks = socksetup(PF_UNSPEC, options, port, &nfds);
|
|
|
|
sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
|
|
|
|
if (blist != NULL) {
|
|
for (i = 0; i < blist_addrs; i++)
|
|
free(blist[i]);
|
|
free(blist);
|
|
}
|
|
|
|
/*
|
|
* Main loop: accept, do a request, continue.
|
|
*/
|
|
memset(&frm, 0, sizeof(frm));
|
|
for (;;) {
|
|
int rv, s;
|
|
/* "short" so it overflows in about 2 hours */
|
|
struct timespec sleeptime = {10, 0};
|
|
|
|
while (child_max < child_count) {
|
|
syslog(LOG_WARNING,
|
|
"too many children, sleeping for %ld seconds",
|
|
(long)sleeptime.tv_sec);
|
|
nanosleep(&sleeptime, NULL);
|
|
sleeptime.tv_sec <<= 1;
|
|
if (sleeptime.tv_sec <= 0) {
|
|
syslog(LOG_CRIT, "sleeptime overflowed! help!");
|
|
sleeptime.tv_sec = 10;
|
|
}
|
|
}
|
|
|
|
rv = poll(socks, nfds, INFTIM);
|
|
if (rv <= 0) {
|
|
if (rv < 0 && errno != EINTR)
|
|
syslog(LOG_WARNING, "poll: %m");
|
|
continue;
|
|
}
|
|
s = -1;
|
|
for (i = 0; i < nfds; i++)
|
|
if (socks[i].revents & POLLIN) {
|
|
frmlen = sizeof(frm);
|
|
s = accept(socks[i].fd,
|
|
(struct sockaddr *)&frm, &frmlen);
|
|
break;
|
|
}
|
|
if (s < 0) {
|
|
if (errno != EINTR)
|
|
syslog(LOG_WARNING, "accept: %m");
|
|
continue;
|
|
}
|
|
|
|
switch (fork()) {
|
|
case 0:
|
|
signal(SIGCHLD, SIG_DFL);
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGINT, SIG_IGN);
|
|
signal(SIGQUIT, SIG_IGN);
|
|
signal(SIGTERM, SIG_IGN);
|
|
for (i = 0; i < nfds; i++)
|
|
(void)close(socks[i].fd);
|
|
dup2(s, STDOUT_FILENO);
|
|
(void)close(s);
|
|
if (frm.ss_family != AF_LOCAL) {
|
|
/* for both AF_INET and AF_INET6 */
|
|
from_remote = 1;
|
|
chkhost((struct sockaddr *)&frm, check_options);
|
|
} else
|
|
from_remote = 0;
|
|
doit();
|
|
exit(0);
|
|
case -1:
|
|
syslog(LOG_WARNING, "fork: %m, sleeping for 10 seconds...");
|
|
sleep(10);
|
|
continue;
|
|
default:
|
|
child_count++;
|
|
}
|
|
(void)close(s);
|
|
}
|
|
}
|
|
|
|
static void
|
|
reapchild(int signo)
|
|
{
|
|
union wait status;
|
|
|
|
while (wait3((int *)&status, WNOHANG, 0) > 0)
|
|
child_count--;
|
|
}
|
|
|
|
static void
|
|
mcleanup(int signo)
|
|
{
|
|
if (lflag)
|
|
syslog(LOG_INFO, "exiting");
|
|
unlink(_PATH_SOCKETNAME);
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Stuff for handling job specifications
|
|
*/
|
|
char *user[MAXUSERS]; /* users to process */
|
|
int users; /* # of users in user array */
|
|
int requ[MAXREQUESTS]; /* job number of spool entries */
|
|
int requests; /* # of spool requests */
|
|
char *person; /* name of person doing lprm */
|
|
|
|
char fromb[NI_MAXHOST]; /* buffer for client's machine name */
|
|
char cbuf[BUFSIZ]; /* command line buffer */
|
|
const char *cmdnames[] = {
|
|
"null",
|
|
"printjob",
|
|
"recvjob",
|
|
"displayq short",
|
|
"displayq long",
|
|
"rmjob"
|
|
};
|
|
|
|
static void
|
|
doit(void)
|
|
{
|
|
char *cp;
|
|
int n;
|
|
|
|
for (;;) {
|
|
cp = cbuf;
|
|
do {
|
|
if (cp >= &cbuf[sizeof(cbuf) - 1])
|
|
fatal("Command line too long");
|
|
if ((n = read(STDOUT_FILENO, cp, 1)) != 1) {
|
|
if (n < 0)
|
|
fatal("Lost connection");
|
|
return;
|
|
}
|
|
} while (*cp++ != '\n');
|
|
*--cp = '\0';
|
|
cp = cbuf;
|
|
if (lflag) {
|
|
if (*cp >= '\1' && *cp <= '\5') {
|
|
syslog(LOG_INFO, "%s requests %s %s",
|
|
from, cmdnames[(int)*cp], cp+1);
|
|
setproctitle("serving %s: %s %s", from,
|
|
cmdnames[(int)*cp], cp+1);
|
|
}
|
|
else
|
|
syslog(LOG_INFO, "bad request (%d) from %s",
|
|
*cp, from);
|
|
}
|
|
switch (*cp++) {
|
|
case '\1': /* check the queue and print any jobs there */
|
|
printer = cp;
|
|
if (*printer == '\0')
|
|
printer = DEFLP;
|
|
printjob();
|
|
break;
|
|
case '\2': /* receive files to be queued */
|
|
if (!from_remote) {
|
|
syslog(LOG_INFO, "illegal request (%d)", *cp);
|
|
exit(1);
|
|
}
|
|
printer = cp;
|
|
if (*printer == '\0')
|
|
printer = DEFLP;
|
|
recvjob();
|
|
break;
|
|
case '\3': /* display the queue (short form) */
|
|
case '\4': /* display the queue (long form) */
|
|
printer = cp;
|
|
if (*printer == '\0')
|
|
printer = DEFLP;
|
|
while (*cp) {
|
|
if (*cp != ' ') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
*cp++ = '\0';
|
|
while (isspace((unsigned char)*cp))
|
|
cp++;
|
|
if (*cp == '\0')
|
|
break;
|
|
if (isdigit((unsigned char)*cp)) {
|
|
if (requests >= MAXREQUESTS)
|
|
fatal("Too many requests");
|
|
requ[requests++] = atoi(cp);
|
|
} else {
|
|
if (users >= MAXUSERS)
|
|
fatal("Too many users");
|
|
user[users++] = cp;
|
|
}
|
|
}
|
|
displayq(cbuf[0] - '\3');
|
|
exit(0);
|
|
case '\5': /* remove a job from the queue */
|
|
if (!from_remote) {
|
|
syslog(LOG_INFO, "illegal request (%d)", *cp);
|
|
exit(1);
|
|
}
|
|
printer = cp;
|
|
if (*printer == '\0')
|
|
printer = DEFLP;
|
|
while (*cp && *cp != ' ')
|
|
cp++;
|
|
if (!*cp)
|
|
break;
|
|
*cp++ = '\0';
|
|
person = cp;
|
|
while (*cp) {
|
|
if (*cp != ' ') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
*cp++ = '\0';
|
|
while (isspace((unsigned char)*cp))
|
|
cp++;
|
|
if (*cp == '\0')
|
|
break;
|
|
if (isdigit((unsigned char)*cp)) {
|
|
if (requests >= MAXREQUESTS)
|
|
fatal("Too many requests");
|
|
requ[requests++] = atoi(cp);
|
|
} else {
|
|
if (users >= MAXUSERS)
|
|
fatal("Too many users");
|
|
user[users++] = cp;
|
|
}
|
|
}
|
|
rmjob();
|
|
break;
|
|
}
|
|
fatal("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)
|
|
{
|
|
char *buf;
|
|
char *cp;
|
|
|
|
/*
|
|
* Restart the daemons.
|
|
*/
|
|
while (cgetnext(&buf, printcapdb) > 0) {
|
|
if (ckqueue(buf) <= 0) {
|
|
free(buf);
|
|
continue; /* no work to do for this printer */
|
|
}
|
|
for (cp = buf; *cp; cp++)
|
|
if (*cp == '|' || *cp == ':') {
|
|
*cp = '\0';
|
|
break;
|
|
}
|
|
if (lflag)
|
|
syslog(LOG_INFO, "work for %s", buf);
|
|
switch (fork()) {
|
|
case -1:
|
|
syslog(LOG_WARNING, "startup: cannot fork");
|
|
mcleanup(0);
|
|
case 0:
|
|
printer = buf;
|
|
setproctitle("working on printer %s", printer);
|
|
cgetclose();
|
|
printjob();
|
|
/* NOTREACHED */
|
|
default:
|
|
child_count++;
|
|
free(buf);
|
|
}
|
|
}
|
|
}
|
|
|
|
#define DUMMY ":nobody::"
|
|
|
|
/*
|
|
* Check to see if the from host has access to the line printer.
|
|
*/
|
|
static void
|
|
chkhost(struct sockaddr *f, int check_opts)
|
|
{
|
|
struct addrinfo hints, *res, *r;
|
|
FILE *hostf;
|
|
int good = 0;
|
|
char hst[NI_MAXHOST], ip[NI_MAXHOST];
|
|
char serv[NI_MAXSERV];
|
|
int error;
|
|
#ifdef LIBWRAP
|
|
struct request_info req;
|
|
#endif
|
|
|
|
error = getnameinfo(f, f->sa_len, NULL, 0, serv, sizeof(serv),
|
|
NI_NUMERICSERV);
|
|
if (error)
|
|
fatal("Malformed from address: %s", gai_strerror(error));
|
|
|
|
if (!(check_opts & LPD_NOPORTCHK) &&
|
|
atoi(serv) >= IPPORT_RESERVED)
|
|
fatal("Connect from invalid port (%s)", serv);
|
|
|
|
/* Need real hostname for temporary filenames */
|
|
error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0,
|
|
NI_NAMEREQD);
|
|
if (error) {
|
|
error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0,
|
|
NI_NUMERICHOST);
|
|
if (error)
|
|
fatal("Host name for your address unknown");
|
|
else
|
|
fatal("Host name for your address (%s) unknown", hst);
|
|
}
|
|
|
|
(void)strlcpy(fromb, hst, sizeof(fromb));
|
|
from = fromb;
|
|
|
|
/* need address in stringform for comparison (no DNS lookup here) */
|
|
error = getnameinfo(f, f->sa_len, hst, sizeof(hst), NULL, 0,
|
|
NI_NUMERICHOST);
|
|
if (error)
|
|
fatal("Cannot print address");
|
|
|
|
/* Check for spoof, ala rlogind */
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = PF_UNSPEC;
|
|
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
error = getaddrinfo(fromb, NULL, &hints, &res);
|
|
if (error) {
|
|
fatal("hostname for your address (%s) unknown: %s", hst,
|
|
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);
|
|
if (!error && !strcmp(hst, ip))
|
|
good = 1;
|
|
}
|
|
if (res)
|
|
freeaddrinfo(res);
|
|
if (good == 0)
|
|
fatal("address for your hostname (%s) not matched", hst);
|
|
|
|
setproctitle("serving %s", from);
|
|
|
|
#ifdef LIBWRAP
|
|
request_init(&req, RQ_DAEMON, "lpd", RQ_CLIENT_SIN, f,
|
|
RQ_FILE, STDOUT_FILENO, NULL);
|
|
fromhost(&req);
|
|
if (!hosts_access(&req))
|
|
goto denied;
|
|
#endif
|
|
|
|
hostf = fopen(_PATH_HOSTSEQUIV, "r");
|
|
if (hostf) {
|
|
if (__ivaliduser_sa(hostf, f, f->sa_len, DUMMY, DUMMY) == 0) {
|
|
(void)fclose(hostf);
|
|
return;
|
|
}
|
|
(void)fclose(hostf);
|
|
}
|
|
hostf = fopen(_PATH_HOSTSLPD, "r");
|
|
if (hostf) {
|
|
if (__ivaliduser_sa(hostf, f, f->sa_len, DUMMY, DUMMY) == 0) {
|
|
(void)fclose(hostf);
|
|
return;
|
|
}
|
|
(void)fclose(hostf);
|
|
}
|
|
#ifdef LIBWRAP
|
|
denied:
|
|
#endif
|
|
fatal("Your host does not have line printer access");
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr,
|
|
"Usage: %s [-dlrsW] [-b bind-address] [-n maxchild] "
|
|
"[-w maxwait] [port]\n", getprogname());
|
|
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 */
|
|
struct pollfd *
|
|
socksetup(int af, int options, const char *port, int *nfds)
|
|
{
|
|
struct sockaddr_un un;
|
|
struct addrinfo hints, *res, *r;
|
|
int error, s, blidx = 0, n;
|
|
struct pollfd *socks, *newsocks;
|
|
const int on = 1;
|
|
|
|
*nfds = 0;
|
|
|
|
socks = malloc(1 * sizeof(socks[0]));
|
|
if (!socks) {
|
|
syslog(LOG_ERR, "couldn't allocate memory for sockets");
|
|
mcleanup(0);
|
|
}
|
|
|
|
s = socket(AF_LOCAL, SOCK_STREAM, 0);
|
|
if (s < 0) {
|
|
syslog(LOG_ERR, "socket(): %m");
|
|
exit(1);
|
|
}
|
|
memset(&un, 0, sizeof(un));
|
|
un.sun_family = AF_LOCAL;
|
|
strncpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path) - 1);
|
|
un.sun_len = SUN_LEN(&un);
|
|
(void)umask(07);
|
|
(void)unlink(_PATH_SOCKETNAME);
|
|
if (bind(s, (struct sockaddr *)&un, un.sun_len) < 0) {
|
|
syslog(LOG_ERR, "bind(): %m");
|
|
exit(1);
|
|
}
|
|
(void)umask(0);
|
|
listen(s, 5);
|
|
socks[*nfds].fd = s;
|
|
socks[*nfds].events = POLLIN;
|
|
(*nfds)++;
|
|
|
|
if (sflag && !blist_addrs)
|
|
return (socks);
|
|
|
|
do {
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_flags = AI_PASSIVE;
|
|
hints.ai_family = af;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
error = getaddrinfo((blist_addrs == 0) ? NULL : blist[blidx],
|
|
port ? port : "printer", &hints, &res);
|
|
if (error) {
|
|
if (blist_addrs)
|
|
syslog(LOG_ERR, "%s: %s", blist[blidx],
|
|
gai_strerror(error));
|
|
else
|
|
syslog(LOG_ERR, "%s", gai_strerror(error));
|
|
mcleanup(0);
|
|
}
|
|
|
|
/* Count max number of sockets we may open */
|
|
for (r = res, n = 0; r; r = r->ai_next, n++)
|
|
;
|
|
newsocks = realloc(socks, (*nfds + n) * sizeof(socks[0]));
|
|
if (!newsocks) {
|
|
syslog(LOG_ERR, "couldn't allocate memory for sockets");
|
|
mcleanup(0);
|
|
}
|
|
socks = newsocks;
|
|
|
|
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 (options & SO_DEBUG)
|
|
if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
|
|
&on, sizeof(on)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt (SO_DEBUG): %m");
|
|
close(s);
|
|
continue;
|
|
}
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &on,
|
|
sizeof(on)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt (SO_REUSEPORT): %m");
|
|
close(s);
|
|
continue;
|
|
}
|
|
if (r->ai_family == AF_INET6 && setsockopt(s,
|
|
IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt (IPV6_V6ONLY): %m");
|
|
close(s);
|
|
continue;
|
|
}
|
|
if (bind(s, r->ai_addr, r->ai_addrlen) < 0) {
|
|
syslog(LOG_DEBUG, "bind(): %m");
|
|
close(s);
|
|
continue;
|
|
}
|
|
listen(s, 5);
|
|
socks[*nfds].fd = s;
|
|
socks[*nfds].events = POLLIN;
|
|
(*nfds)++;
|
|
}
|
|
|
|
if (res)
|
|
freeaddrinfo(res);
|
|
} while (++blidx < blist_addrs);
|
|
|
|
return (socks);
|
|
}
|