Annotation of src/usr.bin/telnet/network.c, Revision 1.17
1.17 ! jsg 1: /* $OpenBSD: network.c,v 1.16 2014/07/20 10:55:26 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>
1.16 guenther 38: #include <unistd.h>
1.1 deraadt 39:
40: Ring netoring, netiring;
41: unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
42:
43: /*
44: * Initialize internal network data structures.
45: */
46:
1.12 guenther 47: void
48: init_network(void)
1.1 deraadt 49: {
1.12 guenther 50: ring_init(&netoring, netobuf, sizeof netobuf);
51: ring_init(&netiring, netibuf, sizeof netibuf);
1.14 guenther 52: SetNetTrace(NULL);
1.1 deraadt 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:
1.17 ! jsg 61: int
! 62: stilloob(void)
1.1 deraadt 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");
1.11 guenther 75: quit();
1.1 deraadt 76: }
1.9 millert 77: if (pfd[0].revents & POLLRDBAND)
1.1 deraadt 78: return 1;
1.9 millert 79: else
1.1 deraadt 80: return 0;
81: }
82:
83: /*
84: * setneturg()
85: *
86: * Sets "neturg" to the current location.
87: */
88:
1.17 ! jsg 89: void
! 90: setneturg(void)
1.1 deraadt 91: {
92: ring_mark(&netoring);
93: }
94:
95: /*
96: * netflush
97: * Send as much data as possible to the network,
98: * handling requests for urgent data.
99: *
100: * The return value indicates whether we did any
101: * useful work.
102: */
103:
1.17 ! jsg 104: int
! 105: netflush(void)
1.1 deraadt 106: {
1.7 mpech 107: int n, n1;
1.1 deraadt 108:
109: if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
110: if (!ring_at_mark(&netoring)) {
111: n = send(net, (char *)netoring.consume, n, 0); /* normal write */
112: } else {
113: /*
114: * In 4.2 (and 4.3) systems, there is some question about
115: * what byte in a sendOOB operation is the "OOB" data.
116: * To make ourselves compatible, we only send ONE byte
117: * out of band, the one WE THINK should be OOB (though
118: * we really have more the TCP philosophy of urgent data
119: * rather than the Unix philosophy of OOB data).
120: */
121: n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
122: }
123: }
124: if (n < 0) {
125: if (errno != ENOBUFS && errno != EWOULDBLOCK) {
126: setcommandmode();
127: perror(hostname);
1.16 guenther 128: (void)close(net);
1.1 deraadt 129: ring_clear_mark(&netoring);
130: longjmp(peerdied, -1);
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: }
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