2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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38 * From: @(#)common.c 8.5 (Berkeley) 4/28/95
42 static const char rcsid[] =
43 "$FreeBSD: src/usr.sbin/lpr/common_source/net.c,v 1.3.2.4 2001/06/25 01:00:56 gad Exp $";
46 #include <sys/param.h>
47 #include <sys/socket.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>
56 #include <dirent.h> /* required for lp.h, not used here */
66 #include "pathnames.h"
69 * 'local_host' is always the hostname of the machine which is running
70 * lpr (lpd, whatever), while 'from_host' either points at 'local_host'
71 * or points at a different buffer when receiving a job from a remote
72 * machine (and that buffer has the hostname of that remote machine).
74 char local_host[MAXHOSTNAMELEN]; /* host running lpd/lpr */
75 const char *from_host = local_host; /* client's machine name */
76 const char *from_ip = ""; /* client machine's IP address */
79 u_char family = PF_UNSPEC;
81 u_char family = PF_INET;
84 extern uid_t uid, euid;
87 * Create a TCP connection to host "rhost" at port "rport".
88 * If rport == 0, then use the printer service port.
89 * Most of this code comes from rcmd.c.
92 getport(const struct printer *pp, const char *rhost, int rport)
94 struct addrinfo hints, *res, *ai;
95 int s, timo = 1, lport = IPPORT_RESERVED - 1;
99 * Get the host address and port number to connect to.
102 fatal(pp, "no remote host to connect to");
103 memset(&hints, 0, sizeof(hints));
104 hints.ai_family = family;
105 hints.ai_socktype = SOCK_STREAM;
106 hints.ai_protocol = 0;
107 err = getaddrinfo(rhost, (rport == 0 ? "printer" : NULL),
110 fatal(pp, "%s\n", gai_strerror(err));
112 ((struct sockaddr_in *) res->ai_addr)->sin_port = htons(rport);
115 * Try connecting to the server.
120 s = rresvport_af(&lport, ai->ai_family);
123 if (errno != EAGAIN) {
128 if (refused && timo <= 16) {
139 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
144 * This used to decrement lport, but the current semantics
145 * of rresvport do not provide such a function (in fact,
146 * rresvport should guarantee that the chosen port will
147 * never result in an EADDRINUSE).
149 if (errno == EADDRINUSE) {
153 if (errno == ECONNREFUSED)
156 if (ai->ai_next != NULL) {
160 if (refused && timo <= 16) {
175 * Figure out whether the local machine is the same
176 * as the remote machine (RM) entry (if it exists).
177 * We do this by counting the intersection of our
178 * address list and theirs. This is better than the
179 * old method (comparing the canonical names), as it
180 * allows load-sharing between multiple print servers.
181 * The return value is an error message which must be
185 checkremote(struct printer *pp)
187 char lclhost[MAXHOSTNAMELEN];
188 struct addrinfo hints, *local_res, *remote_res, *lr, *rr;
190 int ncommonaddrs, error;
191 char h1[NI_MAXHOST], h2[NI_MAXHOST];
193 if (!pp->rp_matches_local) { /* Remote printer doesn't match local */
198 pp->remote = 0; /* assume printer is local */
199 if (pp->remote_host == NULL)
202 /* get the addresses of the local host */
203 gethostname(lclhost, sizeof(lclhost));
204 lclhost[sizeof(lclhost) - 1] = '\0';
206 memset(&hints, 0, sizeof(hints));
207 hints.ai_family = family;
208 hints.ai_socktype = SOCK_STREAM;
209 hints.ai_flags = AI_PASSIVE;
210 if ((error = getaddrinfo(lclhost, NULL, &hints, &local_res)) != 0) {
211 asprintf(&err, "unable to get official name "
212 "for local machine %s: %s",
213 lclhost, gai_strerror(error));
217 /* get the official name of RM */
218 memset(&hints, 0, sizeof(hints));
219 hints.ai_family = family;
220 hints.ai_socktype = SOCK_STREAM;
221 hints.ai_flags = AI_PASSIVE;
222 if ((error = getaddrinfo(pp->remote_host, NULL,
223 &hints, &remote_res)) != 0) {
224 asprintf(&err, "unable to get address list for "
225 "remote machine %s: %s",
226 pp->remote_host, gai_strerror(error));
227 freeaddrinfo(local_res);
232 for (lr = local_res; lr; lr = lr->ai_next) {
234 if (getnameinfo(lr->ai_addr, lr->ai_addrlen, h1, sizeof(h1),
235 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
237 for (rr = remote_res; rr; rr = rr->ai_next) {
239 if (getnameinfo(rr->ai_addr, rr->ai_addrlen,
240 h2, sizeof(h2), NULL, 0,
241 NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
243 if (strcmp(h1, h2) == 0)
249 * if the two hosts do not share at least one IP address
250 * then the printer must be remote.
252 if (ncommonaddrs == 0)
254 freeaddrinfo(local_res);
255 freeaddrinfo(remote_res);
260 * This isn't really network-related, but it's used here to write
261 * multi-part strings onto sockets without using stdio. Return
262 * values are as for writev(2).
265 writel(int strm, ...)
271 struct iovec iov[NIOV], *iovp = iov;
274 /* first count them */
278 cp = va_arg(ap, char *);
282 n--; /* correct for count of trailing null */
285 iovp = malloc(n * sizeof *iovp);
290 /* now make up iovec and send */
292 for (i = 0; i < n; i++) {
293 iovp[i].iov_base = va_arg(ap, char *);
294 iovp[i].iov_len = strlen(iovp[i].iov_base);
297 retval = writev(strm, iovp, n);