Annotation of src/usr.bin/telnet/network.c, Revision 1.12
1.12 ! guenther 1: /* $OpenBSD: network.c,v 1.11 2014/07/20 05:22:02 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"
1.11 guenther 34: #include <poll.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:
1.12 ! guenther 43: void
! 44: init_network(void)
1.1 deraadt 45: {
1.12 ! guenther 46: ring_init(&netoring, netobuf, sizeof netobuf);
! 47: ring_init(&netiring, netibuf, sizeof netibuf);
! 48: NetTrace = stdout;
1.1 deraadt 49: }
50:
51:
52: /*
53: * Check to see if any out-of-band data exists on a socket (for
54: * Telnet "synch" processing).
55: */
56:
57: int
58: stilloob()
59: {
1.9 millert 60: struct pollfd pfd[1];
1.1 deraadt 61: int value;
62:
63: do {
1.9 millert 64: pfd[0].fd = net;
65: pfd[0].events = POLLRDBAND;
66: value = poll(pfd, 1, 0);
1.1 deraadt 67: } while ((value == -1) && (errno == EINTR));
68:
69: if (value < 0) {
1.9 millert 70: perror("poll");
1.11 guenther 71: quit();
1.1 deraadt 72: }
1.9 millert 73: if (pfd[0].revents & POLLRDBAND)
1.1 deraadt 74: return 1;
1.9 millert 75: else
1.1 deraadt 76: return 0;
77: }
78:
79:
80: /*
81: * setneturg()
82: *
83: * Sets "neturg" to the current location.
84: */
85:
86: void
87: setneturg()
88: {
89: ring_mark(&netoring);
90: }
91:
92:
93: /*
94: * netflush
95: * Send as much data as possible to the network,
96: * handling requests for urgent data.
97: *
98: * The return value indicates whether we did any
99: * useful work.
100: */
101:
102:
103: int
104: netflush()
105: {
1.7 mpech 106: int n, n1;
1.1 deraadt 107:
108: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
109: if (!ring_at_mark(&netoring)) {
110: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
111: } else {
112: /*
113: * In 4.2 (and 4.3) systems, there is some question about
114: * what byte in a sendOOB operation is the "OOB" data.
115: * To make ourselves compatible, we only send ONE byte
116: * out of band, the one WE THINK should be OOB (though
117: * we really have more the TCP philosophy of urgent data
118: * rather than the Unix philosophy of OOB data).
119: */
120: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
121: }
122: }
123: if (n < 0) {
124: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
125: setcommandmode();
126: perror(hostname);
127: (void)NetClose(net);
128: ring_clear_mark(&netoring);
129: longjmp(peerdied, -1);
130: /*NOTREACHED*/
131: }
132: n = 0;
133: }
134: if (netdata && n) {
135: Dump('>', netoring.consume, n);
136: }
137: if (n) {
138: ring_consumed(&netoring, n);
139: /*
140: * If we sent all, and more to send, then recurse to pick
141: * up the other half.
142: */
143: if ((n1 == n) && ring_full_consecutive(&netoring)) {
144: (void) netflush();
145: }
146: return 1;
147: } else {
148: return 0;
149: }
150: }