Annotation of src/usr.bin/telnet/network.c, Revision 1.10
1.10 ! guenther 1: /* $OpenBSD: network.c,v 1.9 2013/04/21 09:51:24 millert Exp $ */
1.2 niklas 2: /* $NetBSD: network.c,v 1.5 1996/02/28 21:04:06 thorpej Exp $ */
3:
1.1 deraadt 4: /*
5: * Copyright (c) 1988, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.8 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
1.5 art 33: #include "telnet_locl.h"
1.6 art 34: #include <err.h>
1.1 deraadt 35:
36: Ring netoring, netiring;
37: unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
38:
39: /*
40: * Initialize internal network data structures.
41: */
42:
43: void
44: init_network()
45: {
46: if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) {
47: exit(1);
48: }
49: if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) {
50: exit(1);
51: }
52: NetTrace = stdout;
53: }
54:
55:
56: /*
57: * Check to see if any out-of-band data exists on a socket (for
58: * Telnet "synch" processing).
59: */
60:
61: int
62: stilloob()
63: {
1.9 millert 64: struct pollfd pfd[1];
1.1 deraadt 65: int value;
66:
67: do {
1.9 millert 68: pfd[0].fd = net;
69: pfd[0].events = POLLRDBAND;
70: value = poll(pfd, 1, 0);
1.1 deraadt 71: } while ((value == -1) && (errno == EINTR));
72:
73: if (value < 0) {
1.9 millert 74: perror("poll");
1.1 deraadt 75: (void) quit();
76: /* NOTREACHED */
77: }
1.9 millert 78: if (pfd[0].revents & POLLRDBAND)
1.1 deraadt 79: return 1;
1.9 millert 80: else
1.1 deraadt 81: return 0;
82: }
83:
84:
85: /*
86: * setneturg()
87: *
88: * Sets "neturg" to the current location.
89: */
90:
91: void
92: setneturg()
93: {
94: ring_mark(&netoring);
95: }
96:
97:
98: /*
99: * netflush
100: * Send as much data as possible to the network,
101: * handling requests for urgent data.
102: *
103: * The return value indicates whether we did any
104: * useful work.
105: */
106:
107:
108: int
109: netflush()
110: {
1.7 mpech 111: int n, n1;
1.1 deraadt 112:
113: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
114: if (!ring_at_mark(&netoring)) {
115: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
116: } else {
117: /*
118: * In 4.2 (and 4.3) systems, there is some question about
119: * what byte in a sendOOB operation is the "OOB" data.
120: * To make ourselves compatible, we only send ONE byte
121: * out of band, the one WE THINK should be OOB (though
122: * we really have more the TCP philosophy of urgent data
123: * rather than the Unix philosophy of OOB data).
124: */
125: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
126: }
127: }
128: if (n < 0) {
129: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
130: setcommandmode();
131: perror(hostname);
132: (void)NetClose(net);
133: ring_clear_mark(&netoring);
134: longjmp(peerdied, -1);
135: /*NOTREACHED*/
136: }
137: n = 0;
138: }
139: if (netdata && n) {
140: Dump('>', netoring.consume, n);
141: }
142: if (n) {
143: ring_consumed(&netoring, n);
144: /*
145: * If we sent all, and more to send, then recurse to pick
146: * up the other half.
147: */
148: if ((n1 == n) && ring_full_consecutive(&netoring)) {
149: (void) netflush();
150: }
151: return 1;
152: } else {
153: return 0;
154: }
155: }
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