2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
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10 * the permission of UNIX System Laboratories, Inc.
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22 * This product includes software developed by the University of
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40 * From: @(#)common.c 8.5 (Berkeley) 4/28/95
43 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
44 #include <sys/param.h>
45 #include <sys/socket.h>
50 #include <netinet/in.h>
51 #include <arpa/inet.h>
54 #include <dirent.h> /* required for lp.h, not used here */
65 #include "pathnames.h"
68 * 'local_host' is always the hostname of the machine which is running
69 * lpr (lpd, whatever), while 'from_host' either points at 'local_host'
70 * or points at a different buffer when receiving a job from a remote
71 * machine (and that buffer has the hostname of that remote machine).
73 char local_host[MAXHOSTNAMELEN]; /* host running lpd/lpr */
74 const char *from_host = local_host; /* client's machine name */
75 const char *from_ip = ""; /* client machine's IP address */
78 u_char family = PF_UNSPEC;
80 u_char family = PF_INET;
84 * Create a TCP connection to host "rhost" at port "rport".
85 * If rport == 0, then use the printer service port.
86 * Most of this code comes from rcmd.c.
89 getport(const struct printer *pp, const char *rhost, int rport)
91 struct addrinfo hints, *res, *ai;
92 int s, timo = 1, lport = IPPORT_RESERVED - 1;
93 int error, refused = 0;
96 * Get the host address and port number to connect to.
99 fatal(pp, "no remote host to connect to");
100 memset(&hints, 0, sizeof(hints));
101 hints.ai_family = family;
102 hints.ai_socktype = SOCK_STREAM;
103 hints.ai_protocol = 0;
104 error = getaddrinfo(rhost, (rport == 0 ? "printer" : NULL),
107 fatal(pp, "%s\n", gai_strerror(error));
109 ((struct sockaddr_in *) res->ai_addr)->sin_port = htons(rport);
112 * Try connecting to the server.
117 s = rresvport_af(&lport, ai->ai_family);
120 if (errno != EAGAIN) {
125 if (refused && timo <= 16) {
136 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
141 * This used to decrement lport, but the current semantics
142 * of rresvport do not provide such a function (in fact,
143 * rresvport should guarantee that the chosen port will
144 * never result in an EADDRINUSE).
146 if (errno == EADDRINUSE) {
150 if (errno == ECONNREFUSED)
153 if (ai->ai_next != NULL) {
157 if (refused && timo <= 16) {
172 * Figure out whether the local machine is the same
173 * as the remote machine (RM) entry (if it exists).
174 * We do this by counting the intersection of our
175 * address list and theirs. This is better than the
176 * old method (comparing the canonical names), as it
177 * allows load-sharing between multiple print servers.
178 * The return value is an error message which must be
182 checkremote(struct printer *pp)
184 char lclhost[MAXHOSTNAMELEN];
185 struct addrinfo hints, *local_res, *remote_res, *lr, *rr;
187 int ncommonaddrs, errno;
188 char h1[NI_MAXHOST], h2[NI_MAXHOST];
190 if (!pp->rp_matches_local) { /* Remote printer doesn't match local */
195 pp->remote = 0; /* assume printer is local */
196 if (pp->remote_host == NULL)
199 /* get the addresses of the local host */
200 gethostname(lclhost, sizeof(lclhost));
201 lclhost[sizeof(lclhost) - 1] = '\0';
203 memset(&hints, 0, sizeof(hints));
204 hints.ai_family = family;
205 hints.ai_socktype = SOCK_STREAM;
206 hints.ai_flags = AI_PASSIVE;
207 if ((errno = getaddrinfo(lclhost, NULL, &hints, &local_res)) != 0) {
208 asprintf(&error, "unable to get official name "
209 "for local machine %s: %s",
210 lclhost, gai_strerror(errno));
214 /* get the official name of RM */
215 memset(&hints, 0, sizeof(hints));
216 hints.ai_family = family;
217 hints.ai_socktype = SOCK_STREAM;
218 hints.ai_flags = AI_PASSIVE;
219 if ((errno = getaddrinfo(pp->remote_host, NULL,
220 &hints, &remote_res)) != 0) {
221 asprintf(&error, "unable to get address list for "
222 "remote machine %s: %s",
223 pp->remote_host, gai_strerror(errno));
224 freeaddrinfo(local_res);
229 for (lr = local_res; lr; lr = lr->ai_next) {
231 if (getnameinfo(lr->ai_addr, lr->ai_addrlen, h1, sizeof(h1),
232 NULL, 0, NI_NUMERICHOST) != 0)
234 for (rr = remote_res; rr; rr = rr->ai_next) {
236 if (getnameinfo(rr->ai_addr, rr->ai_addrlen,
237 h2, sizeof(h2), NULL, 0,
238 NI_NUMERICHOST) != 0)
240 if (strcmp(h1, h2) == 0)
246 * if the two hosts do not share at least one IP address
247 * then the printer must be remote.
249 if (ncommonaddrs == 0)
251 freeaddrinfo(local_res);
252 freeaddrinfo(remote_res);
257 * This isn't really network-related, but it's used here to write
258 * multi-part strings onto sockets without using stdio. Return
259 * values are as for writev(2).
262 writel(int strm, ...)
268 struct iovec iov[NIOV], *iovp = iov;
271 /* first count them */
275 cp = va_arg(ap, char *);
279 n--; /* correct for count of trailing null */
282 iovp = malloc(n * sizeof *iovp);
287 /* now make up iovec and send */
289 for (i = 0; i < n; i++) {
290 iovp[i].iov_base = va_arg(ap, char *);
291 iovp[i].iov_len = strlen(iovp[i].iov_base);
294 retval = writev(strm, iovp, n);