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1 | /* |
2 | * Copyright (c) 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b36fc510 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
897ce52e KB |
16 | */ |
17 | ||
18 | #ifndef lint | |
b36fc510 | 19 | static char sccsid[] = "@(#)network.c 1.13 (Berkeley) %G%"; |
897ce52e KB |
20 | #endif /* not lint */ |
21 | ||
8bca9c52 GM |
22 | #include <sys/types.h> |
23 | #include <sys/socket.h> | |
24 | #include <sys/time.h> | |
25 | ||
26 | #include <errno.h> | |
27 | ||
28 | #include <arpa/telnet.h> | |
29 | ||
115a5494 GM |
30 | #include "ring.h" |
31 | ||
8bca9c52 GM |
32 | #include "defines.h" |
33 | #include "externs.h" | |
ad1c581e | 34 | #include "fdset.h" |
8bca9c52 | 35 | |
b307f09e GM |
36 | Ring netoring, netiring; |
37 | char netobuf[2*BUFSIZ], netibuf[BUFSIZ]; | |
8bca9c52 GM |
38 | |
39 | /* | |
40 | * Initialize internal network data structures. | |
41 | */ | |
42 | ||
43 | init_network() | |
44 | { | |
80a47e22 GM |
45 | if (ring_init(&netoring, netobuf, sizeof netobuf) != 1) { |
46 | exit(1); | |
47 | } | |
48 | if (ring_init(&netiring, netibuf, sizeof netibuf) != 1) { | |
49 | exit(1); | |
50 | } | |
8bca9c52 GM |
51 | NetTrace = stdout; |
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 | |
ddfe1126 | 61 | stilloob() |
8bca9c52 GM |
62 | { |
63 | static struct timeval timeout = { 0 }; | |
64 | fd_set excepts; | |
65 | int value; | |
66 | ||
67 | do { | |
68 | FD_ZERO(&excepts); | |
ddfe1126 GM |
69 | FD_SET(net, &excepts); |
70 | value = select(net+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout); | |
8bca9c52 GM |
71 | } while ((value == -1) && (errno == EINTR)); |
72 | ||
73 | if (value < 0) { | |
74 | perror("select"); | |
80a47e22 | 75 | (void) quit(); |
8bca9c52 | 76 | } |
ddfe1126 | 77 | if (FD_ISSET(net, &excepts)) { |
8bca9c52 GM |
78 | return 1; |
79 | } else { | |
80 | return 0; | |
81 | } | |
82 | } | |
83 | ||
84 | ||
d732be39 GM |
85 | /* |
86 | * setneturg() | |
87 | * | |
88 | * Sets "neturg" to the current location. | |
89 | */ | |
90 | ||
91 | void | |
92 | setneturg() | |
93 | { | |
115a5494 | 94 | ring_mark(&netoring); |
d732be39 GM |
95 | } |
96 | ||
97 | ||
8bca9c52 GM |
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 | { | |
218b1a4c | 111 | register int n, n1; |
8bca9c52 | 112 | |
ad1c581e | 113 | if ((n1 = n = ring_full_consecutive(&netoring)) > 0) { |
115a5494 | 114 | if (!ring_at_mark(&netoring)) { |
8b6750f5 | 115 | n = send(net, netoring.consume, n, 0); /* normal write */ |
8bca9c52 | 116 | } else { |
8bca9c52 GM |
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 | */ | |
8b6750f5 | 125 | n = send(net, netoring.consume, 1, MSG_OOB);/* URGENT data */ |
8bca9c52 GM |
126 | } |
127 | } | |
128 | if (n < 0) { | |
129 | if (errno != ENOBUFS && errno != EWOULDBLOCK) { | |
130 | setcommandmode(); | |
131 | perror(hostname); | |
132 | NetClose(net); | |
115a5494 | 133 | ring_clear_mark(&netoring); |
8bca9c52 GM |
134 | longjmp(peerdied, -1); |
135 | /*NOTREACHED*/ | |
136 | } | |
137 | n = 0; | |
138 | } | |
139 | if (netdata && n) { | |
8b6750f5 | 140 | Dump('>', netoring.consume, n); |
8bca9c52 | 141 | } |
ad1c581e | 142 | if (n) { |
ad1c581e | 143 | ring_consumed(&netoring, n); |
218b1a4c GM |
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; | |
ad1c581e | 154 | } |
8bca9c52 | 155 | } |