Annotation of src/usr.bin/telnet/network.c, Revision 1.8
1.8 ! millert 1: /* $OpenBSD: network.c,v 1.7 2001/11/19 19:02:16 mpech 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: {
64: static struct timeval timeout = { 0 };
1.4 deraadt 65: fd_set *fdsp;
66: int fdsn;
1.1 deraadt 67: int value;
68:
1.4 deraadt 69: fdsn = howmany(net+1, NFDBITS) * sizeof(fd_mask);
70: if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
71: err(1, "malloc");
72:
1.1 deraadt 73: do {
1.4 deraadt 74: memset(fdsp, 0, fdsn);
75: FD_SET(net, fdsp);
76: value = select(net+1, (fd_set *)0, (fd_set *)0, fdsp, &timeout);
1.1 deraadt 77: } while ((value == -1) && (errno == EINTR));
78:
79: if (value < 0) {
80: perror("select");
1.4 deraadt 81: free(fdsp);
1.1 deraadt 82: (void) quit();
83: /* NOTREACHED */
84: }
1.4 deraadt 85: if (FD_ISSET(net, fdsp)) {
86: free(fdsp);
1.1 deraadt 87: return 1;
88: } else {
1.5 art 89: free(fdsp);
1.1 deraadt 90: return 0;
91: }
92: }
93:
94:
95: /*
96: * setneturg()
97: *
98: * Sets "neturg" to the current location.
99: */
100:
101: void
102: setneturg()
103: {
104: ring_mark(&netoring);
105: }
106:
107:
108: /*
109: * netflush
110: * Send as much data as possible to the network,
111: * handling requests for urgent data.
112: *
113: * The return value indicates whether we did any
114: * useful work.
115: */
116:
117:
118: int
119: netflush()
120: {
1.7 mpech 121: int n, n1;
1.1 deraadt 122:
1.5 art 123: #if defined(ENCRYPTION)
124: if (encrypt_output)
125: ring_encrypt(&netoring, encrypt_output);
126: #endif
1.1 deraadt 127: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
128: if (!ring_at_mark(&netoring)) {
129: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
130: } else {
131: /*
132: * In 4.2 (and 4.3) systems, there is some question about
133: * what byte in a sendOOB operation is the "OOB" data.
134: * To make ourselves compatible, we only send ONE byte
135: * out of band, the one WE THINK should be OOB (though
136: * we really have more the TCP philosophy of urgent data
137: * rather than the Unix philosophy of OOB data).
138: */
139: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
140: }
141: }
142: if (n < 0) {
143: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
144: setcommandmode();
145: perror(hostname);
146: (void)NetClose(net);
147: ring_clear_mark(&netoring);
148: longjmp(peerdied, -1);
149: /*NOTREACHED*/
150: }
151: n = 0;
152: }
153: if (netdata && n) {
154: Dump('>', netoring.consume, n);
155: }
156: if (n) {
157: ring_consumed(&netoring, n);
158: /*
159: * If we sent all, and more to send, then recurse to pick
160: * up the other half.
161: */
162: if ((n1 == n) && ring_full_consecutive(&netoring)) {
163: (void) netflush();
164: }
165: return 1;
166: } else {
167: return 0;
168: }
169: }
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