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300 lines
8.1 KiB
C
300 lines
8.1 KiB
C
/*
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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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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* From: @(#)common.c 8.5 (Berkeley) 4/28/95
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*/
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#include "lp.cdefs.h" /* A cross-platform version of <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 <sys/stat.h>
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#include <sys/time.h>
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#include <sys/uio.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 <dirent.h> /* required for lp.h, not used here */
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#include <errno.h>
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#include <stdarg.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 <unistd.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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/*
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* 'local_host' is always the hostname of the machine which is running
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* lpr (lpd, whatever), while 'from_host' either points at 'local_host'
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* or points at a different buffer when receiving a job from a remote
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* machine (and that buffer has the hostname of that remote machine).
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*/
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char local_host[MAXHOSTNAMELEN]; /* host running lpd/lpr */
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const char *from_host = local_host; /* client's machine name */
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const char *from_ip = ""; /* client machine's IP address */
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#ifdef INET6
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u_char family = PF_UNSPEC;
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#else
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u_char family = PF_INET;
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#endif
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extern uid_t uid, euid;
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/*
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* Create a TCP connection to host "rhost" at port "rport".
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* If rport == 0, then use the printer service port.
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* Most of this code comes from rcmd.c.
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*/
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int
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getport(const struct printer *pp, const char *rhost, int rport)
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{
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struct addrinfo hints, *res, *ai;
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int s, timo = 1, lport = IPPORT_RESERVED - 1;
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int err, refused = 0;
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/*
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* Get the host address and port number to connect to.
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*/
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if (rhost == NULL)
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fatal(pp, "no remote host to connect to");
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = family;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = 0;
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err = getaddrinfo(rhost, (rport == 0 ? "printer" : NULL),
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&hints, &res);
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if (err)
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fatal(pp, "%s\n", gai_strerror(err));
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if (rport != 0)
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((struct sockaddr_in *) res->ai_addr)->sin_port = htons(rport);
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/*
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* Try connecting to the server.
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*/
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ai = res;
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retry:
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seteuid(euid);
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s = rresvport_af(&lport, ai->ai_family);
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seteuid(uid);
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if (s < 0) {
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if (errno != EAGAIN) {
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if (ai->ai_next) {
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ai = ai->ai_next;
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goto retry;
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}
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if (refused && timo <= 16) {
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sleep(timo);
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timo *= 2;
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refused = 0;
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ai = res;
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goto retry;
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}
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}
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freeaddrinfo(res);
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return(-1);
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}
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if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
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err = errno;
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(void) close(s);
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errno = err;
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/*
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* This used to decrement lport, but the current semantics
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* of rresvport do not provide such a function (in fact,
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* rresvport should guarantee that the chosen port will
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* never result in an EADDRINUSE).
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*/
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if (errno == EADDRINUSE) {
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goto retry;
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}
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if (errno == ECONNREFUSED)
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refused++;
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if (ai->ai_next != NULL) {
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ai = ai->ai_next;
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goto retry;
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}
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if (refused && timo <= 16) {
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sleep(timo);
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timo *= 2;
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refused = 0;
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ai = res;
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goto retry;
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}
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freeaddrinfo(res);
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return(-1);
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}
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freeaddrinfo(res);
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return(s);
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}
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/*
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* Figure out whether the local machine is the same
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* as the remote machine (RM) entry (if it exists).
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* We do this by counting the intersection of our
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* address list and theirs. This is better than the
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* old method (comparing the canonical names), as it
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* allows load-sharing between multiple print servers.
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* The return value is an error message which must be
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* free()d.
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*/
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char *
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checkremote(struct printer *pp)
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{
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char lclhost[MAXHOSTNAMELEN];
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struct addrinfo hints, *local_res, *remote_res, *lr, *rr;
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char *err;
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int ncommonaddrs, error;
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char h1[NI_MAXHOST], h2[NI_MAXHOST];
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if (!pp->rp_matches_local) { /* Remote printer doesn't match local */
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pp->remote = 1;
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return NULL;
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}
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pp->remote = 0; /* assume printer is local */
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if (pp->remote_host == NULL)
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return NULL;
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/* get the addresses of the local host */
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gethostname(lclhost, sizeof(lclhost));
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lclhost[sizeof(lclhost) - 1] = '\0';
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = family;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_PASSIVE;
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if ((error = getaddrinfo(lclhost, NULL, &hints, &local_res)) != 0) {
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asprintf(&err, "unable to get official name "
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"for local machine %s: %s",
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lclhost, gai_strerror(error));
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return err;
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}
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/* get the official name of RM */
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = family;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_PASSIVE;
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if ((error = getaddrinfo(pp->remote_host, NULL,
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&hints, &remote_res)) != 0) {
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asprintf(&err, "unable to get address list for "
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"remote machine %s: %s",
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pp->remote_host, gai_strerror(error));
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freeaddrinfo(local_res);
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return err;
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}
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ncommonaddrs = 0;
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for (lr = local_res; lr; lr = lr->ai_next) {
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h1[0] = '\0';
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if (getnameinfo(lr->ai_addr, lr->ai_addrlen, h1, sizeof(h1),
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NULL, 0, NI_NUMERICHOST) != 0)
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continue;
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for (rr = remote_res; rr; rr = rr->ai_next) {
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h2[0] = '\0';
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if (getnameinfo(rr->ai_addr, rr->ai_addrlen,
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h2, sizeof(h2), NULL, 0,
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NI_NUMERICHOST) != 0)
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continue;
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if (strcmp(h1, h2) == 0)
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ncommonaddrs++;
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}
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}
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/*
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* if the two hosts do not share at least one IP address
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* then the printer must be remote.
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*/
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if (ncommonaddrs == 0)
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pp->remote = 1;
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freeaddrinfo(local_res);
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freeaddrinfo(remote_res);
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return NULL;
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}
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/*
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* This isn't really network-related, but it's used here to write
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* multi-part strings onto sockets without using stdio. Return
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* values are as for writev(2).
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*/
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ssize_t
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writel(int strm, ...)
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{
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va_list ap;
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int i, n;
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const char *cp;
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#define NIOV 12
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struct iovec iov[NIOV], *iovp = iov;
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ssize_t retval;
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/* first count them */
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va_start(ap, strm);
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n = 0;
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do {
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cp = va_arg(ap, char *);
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n++;
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} while (cp);
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va_end(ap);
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n--; /* correct for count of trailing null */
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if (n > NIOV) {
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iovp = malloc(n * sizeof *iovp);
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if (iovp == 0)
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return -1;
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}
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/* now make up iovec and send */
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va_start(ap, strm);
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for (i = 0; i < n; i++) {
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iovp[i].iov_base = va_arg(ap, char *);
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iovp[i].iov_len = strlen(iovp[i].iov_base);
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}
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va_end(ap);
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retval = writev(strm, iovp, n);
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if (iovp != iov)
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free(iovp);
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return retval;
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}
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