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34 #include "telnet_locl.h"
36 RCSID("$Id: network.c 13941 2004-06-20 17:01:28Z lha $");
38 Ring netoring, netiring;
39 size_t netobufsize = 64*1024;
40 size_t netibufsize = 64*1024;
43 * Initialize internal network data structures.
51 if ((obuf = malloc(netobufsize)) == NULL)
53 if ((ibuf = malloc(netibufsize)) == NULL)
56 if (ring_init(&netoring, obuf, netobufsize) != 1) {
59 if (ring_init(&netiring, ibuf, netibufsize) != 1) {
67 * Check to see if any out-of-band data exists on a socket (for
68 * Telnet "synch" processing).
74 static struct timeval timeout = { 0 };
80 if (net >= FD_SETSIZE)
81 errx (1, "fd too large");
82 FD_SET(net, &excepts);
83 value = select(net+1, 0, 0, &excepts, &timeout);
84 } while ((value == -1) && (errno == EINTR));
91 if (FD_ISSET(net, &excepts)) {
102 * Sets "neturg" to the current location.
108 ring_mark(&netoring);
114 * Send as much data as possible to the network,
115 * handling requests for urgent data.
117 * The return value indicates whether we did any
127 #if defined(ENCRYPTION)
129 ring_encrypt(&netoring, encrypt_output);
131 if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
132 if (!ring_at_mark(&netoring)) {
133 n = send(net, (char *)netoring.consume, n, 0); /* normal write */
136 * In 4.2 (and 4.3) systems, there is some question about
137 * what byte in a sendOOB operation is the "OOB" data.
138 * To make ourselves compatible, we only send ONE byte
139 * out of band, the one WE THINK should be OOB (though
140 * we really have more the TCP philosophy of urgent data
141 * rather than the Unix philosophy of OOB data).
143 n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
147 if (errno != ENOBUFS && errno != EWOULDBLOCK) {
151 ring_clear_mark(&netoring);
152 longjmp(peerdied, -1);
158 Dump('>', netoring.consume, n);
161 ring_consumed(&netoring, n);
163 * If we sent all, and more to send, then recurse to pick
166 if ((n1 == n) && ring_full_consecutive(&netoring)) {