Annotation of src/usr.bin/telnet/network.c, Revision 1.1.1.1
1.1 deraadt 1: /*
2: * Copyright (c) 1988, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: */
33:
34: #ifndef lint
35: /* from: static char sccsid[] = "@(#)network.c 8.1 (Berkeley) 6/6/93"; */
36: static char *rcsid = "$Id: network.c,v 1.3 1994/02/25 03:00:31 cgd Exp $";
37: #endif /* not lint */
38:
39: #include <sys/types.h>
40: #include <sys/socket.h>
41: #include <sys/time.h>
42:
43: #include <errno.h>
44:
45: #include <arpa/telnet.h>
46:
47: #include "ring.h"
48:
49: #include "defines.h"
50: #include "externs.h"
51: #include "fdset.h"
52:
53: Ring netoring, netiring;
54: unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
55:
56: /*
57: * Initialize internal network data structures.
58: */
59:
60: void
61: init_network()
62: {
63: if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) {
64: exit(1);
65: }
66: if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) {
67: exit(1);
68: }
69: NetTrace = stdout;
70: }
71:
72:
73: /*
74: * Check to see if any out-of-band data exists on a socket (for
75: * Telnet "synch" processing).
76: */
77:
78: int
79: stilloob()
80: {
81: static struct timeval timeout = { 0 };
82: fd_set excepts;
83: int value;
84:
85: do {
86: FD_ZERO(&excepts);
87: FD_SET(net, &excepts);
88: value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
89: } while ((value == -1) && (errno == EINTR));
90:
91: if (value < 0) {
92: perror("select");
93: (void) quit();
94: /* NOTREACHED */
95: }
96: if (FD_ISSET(net, &excepts)) {
97: return 1;
98: } else {
99: return 0;
100: }
101: }
102:
103:
104: /*
105: * setneturg()
106: *
107: * Sets "neturg" to the current location.
108: */
109:
110: void
111: setneturg()
112: {
113: ring_mark(&netoring);
114: }
115:
116:
117: /*
118: * netflush
119: * Send as much data as possible to the network,
120: * handling requests for urgent data.
121: *
122: * The return value indicates whether we did any
123: * useful work.
124: */
125:
126:
127: int
128: netflush()
129: {
130: register int n, n1;
131:
132: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
133: if (!ring_at_mark(&netoring)) {
134: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
135: } else {
136: /*
137: * In 4.2 (and 4.3) systems, there is some question about
138: * what byte in a sendOOB operation is the "OOB" data.
139: * To make ourselves compatible, we only send ONE byte
140: * out of band, the one WE THINK should be OOB (though
141: * we really have more the TCP philosophy of urgent data
142: * rather than the Unix philosophy of OOB data).
143: */
144: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
145: }
146: }
147: if (n < 0) {
148: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
149: setcommandmode();
150: perror(hostname);
151: (void)NetClose(net);
152: ring_clear_mark(&netoring);
153: longjmp(peerdied, -1);
154: /*NOTREACHED*/
155: }
156: n = 0;
157: }
158: if (netdata && n) {
159: Dump('>', netoring.consume, n);
160: }
161: if (n) {
162: ring_consumed(&netoring, n);
163: /*
164: * If we sent all, and more to send, then recurse to pick
165: * up the other half.
166: */
167: if ((n1 == n) && ring_full_consecutive(&netoring)) {
168: (void) netflush();
169: }
170: return 1;
171: } else {
172: return 0;
173: }
174: }
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