1 #pragma ident "%Z%%M% %I% %E% SMI"
2
3 /*
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
36 * Use is subject to license terms.
37 */
38
39 #ifndef lint
40 static char sccsid[] = "@(#)network.c 8.1 (Berkeley) 6/6/93";
41 #endif /* not lint */
42
43 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include <sys/time.h>
46
47 #include <errno.h>
48
49 #include <arpa/telnet.h>
50
51 #include "ring.h"
52
53 #include "defines.h"
54 #include "externs.h"
55
56 Ring netoring;
57 Ring netiring;
58
59 /*
60 * Use large buffers to handle larger tickets when doing
61 * Kerberos authentication. Microsoft generates large
62 * tickets that exceed the buffer size which causes authentication
63 * to fail.
64 */
65 static unsigned char netobuf[10*BUFSIZ];
66 static unsigned char netibuf[10*BUFSIZ];
67
68 /*
69 * Initialize internal network data structures.
70 */
71
72 void
init_network()73 init_network()
74 {
75 if (ring_init(&netoring, netobuf, sizeof (netobuf)) != 1) {
76 exit(1);
77 }
78 if (ring_init(&netiring, netibuf, sizeof (netibuf)) != 1) {
79 exit(1);
80 }
81 NetTrace = stdout;
82 }
83
84
85 /*
86 * Check to see if any out-of-band data exists on a socket (for
87 * Telnet "synch" processing).
88 */
89
90 int
stilloob()91 stilloob()
92 {
93 static struct timeval timeout = { 0 };
94 fd_set excepts;
95 int value;
96
97 do {
98 FD_ZERO(&excepts);
99 FD_SET(net, &excepts);
100 value = select(net+1, NULL, NULL, &excepts, &timeout);
101 } while ((value == -1) && (errno == EINTR));
102
103 if (value < 0) {
104 perror("select");
105 (void) quit();
106 /* NOTREACHED */
107 }
108 if (FD_ISSET(net, &excepts)) {
109 return (1);
110 } else {
111 return (0);
112 }
113 }
114
115
116 /*
117 * setneturg()
118 *
119 * Sets "neturg" to the current location.
120 */
121
122 void
setneturg()123 setneturg()
124 {
125 ring_mark(&netoring);
126 }
127
128
129 /*
130 * netflush
131 * Send as much data as possible to the network,
132 * handling requests for urgent data.
133 *
134 * The return value indicates whether we did any
135 * useful work.
136 */
137
138
139 int
netflush()140 netflush()
141 {
142 register int n, n1;
143
144 if (encrypt_output)
145 ring_encrypt(&netoring, encrypt_output);
146
147 if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
148 if (!ring_at_mark(&netoring)) {
149 /* normal write */
150 n = send(net, netoring.consume, n, 0);
151 } else {
152 /*
153 * In 4.2(and 4.3) systems, there is some question about
154 * what byte in a sendOOB operation is the "OOB" data.
155 * To make ourselves compatible, we only send ONE byte
156 * out of band, the one WE THINK should be OOB (though
157 * we really have more the TCP philosophy of urgent data
158 * rather than the Unix philosophy of OOB data).
159 */
160 n = send(net, netoring.consume, 1, MSG_OOB);
161 }
162 }
163 if (n < 0) {
164 if (errno != ENOBUFS && errno != EWOULDBLOCK) {
165 setcommandmode();
166 perror(hostname);
167 ring_clear_mark(&netoring);
168 longjmp(peerdied, -1);
169 /*NOTREACHED*/
170 }
171 n = 0;
172 }
173 if (netdata && n) {
174 Dump('>', netoring.consume, n);
175 }
176 if (n) {
177 ring_consumed(&netoring, n);
178 /*
179 * If we sent all, and more to send, then recurse to pick
180 * up the other half.
181 */
182 if ((n1 == n) && ring_full_consecutive(&netoring)) {
183 (void) netflush();
184 }
185 return (1);
186 } else {
187 return (0);
188 }
189 }
190