Annotation of src/usr.bin/telnet/network.c, Revision 1.14
1.14 ! guenther 1: /* $OpenBSD: network.c,v 1.13 2014/07/20 08:12:46 guenther 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"
1.13 guenther 34:
35: #include <sys/socket.h>
36: #include <errno.h>
1.11 guenther 37: #include <poll.h>
1.1 deraadt 38:
39: Ring netoring, netiring;
40: unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
41:
42: /*
43: * Initialize internal network data structures.
44: */
45:
1.12 guenther 46: void
47: init_network(void)
1.1 deraadt 48: {
1.12 guenther 49: ring_init(&netoring, netobuf, sizeof netobuf);
50: ring_init(&netiring, netibuf, sizeof netibuf);
1.14 ! guenther 51: SetNetTrace(NULL);
1.1 deraadt 52: }
53:
54:
55: /*
56: * Check to see if any out-of-band data exists on a socket (for
57: * Telnet "synch" processing).
58: */
59:
60: int
61: stilloob()
62: {
1.9 millert 63: struct pollfd pfd[1];
1.1 deraadt 64: int value;
65:
66: do {
1.9 millert 67: pfd[0].fd = net;
68: pfd[0].events = POLLRDBAND;
69: value = poll(pfd, 1, 0);
1.1 deraadt 70: } while ((value == -1) && (errno == EINTR));
71:
72: if (value < 0) {
1.9 millert 73: perror("poll");
1.11 guenther 74: quit();
1.1 deraadt 75: }
1.9 millert 76: if (pfd[0].revents & POLLRDBAND)
1.1 deraadt 77: return 1;
1.9 millert 78: else
1.1 deraadt 79: return 0;
80: }
81:
82:
83: /*
84: * setneturg()
85: *
86: * Sets "neturg" to the current location.
87: */
88:
89: void
90: setneturg()
91: {
92: ring_mark(&netoring);
93: }
94:
95:
96: /*
97: * netflush
98: * Send as much data as possible to the network,
99: * handling requests for urgent data.
100: *
101: * The return value indicates whether we did any
102: * useful work.
103: */
104:
105:
106: int
107: netflush()
108: {
1.7 mpech 109: int n, n1;
1.1 deraadt 110:
111: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
112: if (!ring_at_mark(&netoring)) {
113: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
114: } else {
115: /*
116: * In 4.2 (and 4.3) systems, there is some question about
117: * what byte in a sendOOB operation is the "OOB" data.
118: * To make ourselves compatible, we only send ONE byte
119: * out of band, the one WE THINK should be OOB (though
120: * we really have more the TCP philosophy of urgent data
121: * rather than the Unix philosophy of OOB data).
122: */
123: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
124: }
125: }
126: if (n < 0) {
127: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
128: setcommandmode();
129: perror(hostname);
130: (void)NetClose(net);
131: ring_clear_mark(&netoring);
132: longjmp(peerdied, -1);
133: /*NOTREACHED*/
134: }
135: n = 0;
136: }
137: if (netdata && n) {
138: Dump('>', netoring.consume, n);
139: }
140: if (n) {
141: ring_consumed(&netoring, n);
142: /*
143: * If we sent all, and more to send, then recurse to pick
144: * up the other half.
145: */
146: if ((n1 == n) && ring_full_consecutive(&netoring)) {
147: (void) netflush();
148: }
149: return 1;
150: } else {
151: return 0;
152: }
153: }
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