Annotation of src/usr.bin/ssh/packet.c, Revision 1.6
1.1 deraadt 1: /*
2:
3: packet.c
4:
5: Author: Tatu Ylonen <ylo@cs.hut.fi>
6:
7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: All rights reserved
9:
10: Created: Sat Mar 18 02:40:40 1995 ylo
11:
12: This file contains code implementing the packet protocol and communication
13: with the other side. This same code is used both on client and server side.
14:
15: */
16:
17: #include "includes.h"
1.6 ! deraadt 18: RCSID("$Id: packet.c,v 1.5 1999/09/30 05:11:29 deraadt Exp $");
1.1 deraadt 19:
20: #include "xmalloc.h"
21: #include "buffer.h"
22: #include "packet.h"
23: #include "bufaux.h"
24: #include "ssh.h"
25: #include "crc32.h"
26: #include "cipher.h"
27: #include "getput.h"
28:
29: #include "compress.h"
30:
31: /* This variable contains the file descriptors used for communicating with
32: the other side. connection_in is used for reading; connection_out
33: for writing. These can be the same descriptor, in which case it is
34: assumed to be a socket. */
35: static int connection_in = -1;
36: static int connection_out = -1;
37:
38: /* Cipher type. This value is only used to determine whether to pad the
39: packets with zeroes or random data. */
40: static int cipher_type = SSH_CIPHER_NONE;
41:
42: /* Protocol flags for the remote side. */
43: static unsigned int remote_protocol_flags = 0;
44:
45: /* Encryption context for receiving data. This is only used for decryption. */
46: static CipherContext receive_context;
47: /* Encryption coontext for sending data. This is only used for encryption. */
48: static CipherContext send_context;
49:
50: /* Buffer for raw input data from the socket. */
51: static Buffer input;
52:
53: /* Buffer for raw output data going to the socket. */
54: static Buffer output;
55:
56: /* Buffer for the partial outgoing packet being constructed. */
57: static Buffer outgoing_packet;
58:
59: /* Buffer for the incoming packet currently being processed. */
60: static Buffer incoming_packet;
61:
62: /* Scratch buffer for packet compression/decompression. */
63: static Buffer compression_buffer;
64:
65: /* Flag indicating whether packet compression/decompression is enabled. */
66: static int packet_compression = 0;
67:
68: /* Flag indicating whether this module has been initialized. */
69: static int initialized = 0;
70:
71: /* Set to true if the connection is interactive. */
72: static int interactive_mode = 0;
73:
74: /* Sets the descriptors used for communication. Disables encryption until
75: packet_set_encryption_key is called. */
76:
1.2 provos 77: void
78: packet_set_connection(int fd_in, int fd_out)
1.1 deraadt 79: {
80: connection_in = fd_in;
81: connection_out = fd_out;
82: cipher_type = SSH_CIPHER_NONE;
83: cipher_set_key(&send_context, SSH_CIPHER_NONE, (unsigned char *)"", 0, 1);
84: cipher_set_key(&receive_context, SSH_CIPHER_NONE, (unsigned char *)"", 0, 0);
85: if (!initialized)
86: {
87: initialized = 1;
88: buffer_init(&input);
89: buffer_init(&output);
90: buffer_init(&outgoing_packet);
91: buffer_init(&incoming_packet);
92: }
93:
94: /* Kludge: arrange the close function to be called from fatal(). */
95: fatal_add_cleanup((void (*)(void *))packet_close, NULL);
96: }
97:
98: /* Sets the connection into non-blocking mode. */
99:
1.2 provos 100: void
101: packet_set_nonblocking()
1.1 deraadt 102: {
103: /* Set the socket into non-blocking mode. */
104: if (fcntl(connection_in, F_SETFL, O_NONBLOCK) < 0)
105: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
106:
107: if (connection_out != connection_in)
108: {
109: if (fcntl(connection_out, F_SETFL, O_NONBLOCK) < 0)
110: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
111: }
112: }
113:
114: /* Returns the socket used for reading. */
115:
1.2 provos 116: int
117: packet_get_connection_in()
1.1 deraadt 118: {
119: return connection_in;
120: }
121:
122: /* Returns the descriptor used for writing. */
123:
1.2 provos 124: int
125: packet_get_connection_out()
1.1 deraadt 126: {
127: return connection_out;
128: }
129:
130: /* Closes the connection and clears and frees internal data structures. */
131:
1.2 provos 132: void
133: packet_close()
1.1 deraadt 134: {
135: if (!initialized)
136: return;
137: initialized = 0;
138: if (connection_in == connection_out)
139: {
140: shutdown(connection_out, 2);
141: close(connection_out);
142: }
143: else
144: {
145: close(connection_in);
146: close(connection_out);
147: }
148: buffer_free(&input);
149: buffer_free(&output);
150: buffer_free(&outgoing_packet);
151: buffer_free(&incoming_packet);
152: if (packet_compression)
153: {
154: buffer_free(&compression_buffer);
155: buffer_compress_uninit();
156: }
157: }
158:
159: /* Sets remote side protocol flags. */
160:
1.2 provos 161: void
162: packet_set_protocol_flags(unsigned int protocol_flags)
1.1 deraadt 163: {
164: remote_protocol_flags = protocol_flags;
165: channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0);
166: }
167:
168: /* Returns the remote protocol flags set earlier by the above function. */
169:
1.2 provos 170: unsigned int
171: packet_get_protocol_flags()
1.1 deraadt 172: {
173: return remote_protocol_flags;
174: }
175:
176: /* Starts packet compression from the next packet on in both directions.
177: Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. */
178:
1.2 provos 179: void
180: packet_start_compression(int level)
1.1 deraadt 181: {
182: if (packet_compression)
183: fatal("Compression already enabled.");
184: packet_compression = 1;
185: buffer_init(&compression_buffer);
186: buffer_compress_init(level);
187: }
188:
189: /* Encrypts the given number of bytes, copying from src to dest.
190: bytes is known to be a multiple of 8. */
191:
1.2 provos 192: void
193: packet_encrypt(CipherContext *cc, void *dest, void *src,
194: unsigned int bytes)
1.1 deraadt 195: {
196: assert((bytes % 8) == 0);
197: cipher_encrypt(cc, dest, src, bytes);
198: }
199:
200: /* Decrypts the given number of bytes, copying from src to dest.
201: bytes is known to be a multiple of 8. */
202:
1.2 provos 203: void
204: packet_decrypt(CipherContext *cc, void *dest, void *src,
205: unsigned int bytes)
1.1 deraadt 206: {
207: assert((bytes % 8) == 0);
208: cipher_decrypt(cc, dest, src, bytes);
209: }
210:
211: /* Causes any further packets to be encrypted using the given key. The same
212: key is used for both sending and reception. However, both directions
213: are encrypted independently of each other. */
214:
1.2 provos 215: void
216: packet_set_encryption_key(const unsigned char *key, unsigned int keylen,
217: int cipher, int is_client)
1.1 deraadt 218: {
219: cipher_type = cipher;
220: if (cipher == SSH_CIPHER_RC4)
221: {
222: if (is_client)
223: { /* In client: use first half for receiving, second for sending. */
224: cipher_set_key(&receive_context, cipher, key, keylen / 2, 0);
225: cipher_set_key(&send_context, cipher, key + keylen / 2,
226: keylen / 2, 1);
227: }
228: else
229: { /* In server: use first half for sending, second for receiving. */
230: cipher_set_key(&receive_context, cipher, key + keylen / 2,
231: keylen / 2, 0);
232: cipher_set_key(&send_context, cipher, key, keylen / 2, 1);
233: }
234: }
235: else
236: {
237: /* All other ciphers use the same key in both directions for now. */
238: cipher_set_key(&receive_context, cipher, key, keylen, 0);
239: cipher_set_key(&send_context, cipher, key, keylen, 1);
240: }
241: }
242:
243: /* Starts constructing a packet to send. */
244:
1.2 provos 245: void
246: packet_start(int type)
1.1 deraadt 247: {
248: char buf[9];
249:
250: buffer_clear(&outgoing_packet);
251: memset(buf, 0, 8);
252: buf[8] = type;
253: buffer_append(&outgoing_packet, buf, 9);
254: }
255:
256: /* Appends a character to the packet data. */
257:
1.2 provos 258: void
259: packet_put_char(int value)
1.1 deraadt 260: {
261: char ch = value;
262: buffer_append(&outgoing_packet, &ch, 1);
263: }
264:
265: /* Appends an integer to the packet data. */
266:
1.2 provos 267: void
268: packet_put_int(unsigned int value)
1.1 deraadt 269: {
270: buffer_put_int(&outgoing_packet, value);
271: }
272:
273: /* Appends a string to packet data. */
274:
1.2 provos 275: void
276: packet_put_string(const char *buf, unsigned int len)
1.1 deraadt 277: {
278: buffer_put_string(&outgoing_packet, buf, len);
279: }
280:
281: /* Appends an arbitrary precision integer to packet data. */
282:
1.2 provos 283: void
284: packet_put_bignum(BIGNUM *value)
1.1 deraadt 285: {
1.2 provos 286: buffer_put_bignum(&outgoing_packet, value);
1.1 deraadt 287: }
288:
289: /* Finalizes and sends the packet. If the encryption key has been set,
290: encrypts the packet before sending. */
291:
1.2 provos 292: void
293: packet_send()
1.1 deraadt 294: {
295: char buf[8], *cp;
296: int i, padding, len;
297: unsigned long checksum;
1.3 dugsong 298: u_int32_t rand = 0;
1.1 deraadt 299:
300: /* If using packet compression, compress the payload of the outgoing
301: packet. */
302: if (packet_compression)
303: {
304: buffer_clear(&compression_buffer);
305: buffer_consume(&outgoing_packet, 8); /* Skip padding. */
306: buffer_append(&compression_buffer, "\0\0\0\0\0\0\0\0", 8); /* padding */
307: buffer_compress(&outgoing_packet, &compression_buffer);
308: buffer_clear(&outgoing_packet);
309: buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
310: buffer_len(&compression_buffer));
311: }
312:
313: /* Compute packet length without padding (add checksum, remove padding). */
314: len = buffer_len(&outgoing_packet) + 4 - 8;
315:
316: /* Insert padding. */
317: padding = 8 - len % 8;
318: if (cipher_type != SSH_CIPHER_NONE)
319: {
320: cp = buffer_ptr(&outgoing_packet);
1.2 provos 321: for (i = 0; i < padding; i++) {
322: if (i % 4 == 0)
323: rand = arc4random();
324: cp[7 - i] = rand & 0xff;
325: rand >>= 8;
326: }
1.1 deraadt 327: }
328: buffer_consume(&outgoing_packet, 8 - padding);
329:
330: /* Add check bytes. */
331: checksum = crc32((unsigned char *)buffer_ptr(&outgoing_packet),
332: buffer_len(&outgoing_packet));
333: PUT_32BIT(buf, checksum);
334: buffer_append(&outgoing_packet, buf, 4);
335:
336: #ifdef PACKET_DEBUG
337: fprintf(stderr, "packet_send plain: ");
338: buffer_dump(&outgoing_packet);
339: #endif
340:
341: /* Append to output. */
342: PUT_32BIT(buf, len);
343: buffer_append(&output, buf, 4);
344: buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
345: packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
346: buffer_len(&outgoing_packet));
347:
348: #ifdef PACKET_DEBUG
349: fprintf(stderr, "encrypted: "); buffer_dump(&output);
350: #endif
351:
352: buffer_clear(&outgoing_packet);
353:
354: /* Note that the packet is now only buffered in output. It won\'t be
355: actually sent until packet_write_wait or packet_write_poll is called. */
356: }
357:
358: /* Waits until a packet has been received, and returns its type. Note that
359: no other data is processed until this returns, so this function should
360: not be used during the interactive session. */
361:
1.2 provos 362: int
363: packet_read(int *payload_len_ptr)
1.1 deraadt 364: {
365: int type, len;
366: fd_set set;
367: char buf[8192];
368:
369: /* Since we are blocking, ensure that all written packets have been sent. */
370: packet_write_wait();
371:
372: /* Stay in the loop until we have received a complete packet. */
373: for (;;)
374: {
375: /* Try to read a packet from the buffer. */
376: type = packet_read_poll(payload_len_ptr);
377: if (type == SSH_SMSG_SUCCESS
378: || type == SSH_SMSG_FAILURE
379: || type == SSH_CMSG_EOF
380: || type == SSH_CMSG_EXIT_CONFIRMATION)
381: packet_integrity_check(*payload_len_ptr, 0, type);
382: /* If we got a packet, return it. */
383: if (type != SSH_MSG_NONE)
384: return type;
385: /* Otherwise, wait for some data to arrive, add it to the buffer,
386: and try again. */
387: FD_ZERO(&set);
388: FD_SET(connection_in, &set);
389: /* Wait for some data to arrive. */
390: select(connection_in + 1, &set, NULL, NULL, NULL);
391: /* Read data from the socket. */
392: len = read(connection_in, buf, sizeof(buf));
393: if (len == 0)
394: fatal("Connection closed by remote host.");
395: if (len < 0)
396: fatal("Read from socket failed: %.100s", strerror(errno));
397: /* Append it to the buffer. */
398: packet_process_incoming(buf, len);
399: }
400: /*NOTREACHED*/
401: }
402:
403: /* Waits until a packet has been received, verifies that its type matches
404: that given, and gives a fatal error and exits if there is a mismatch. */
405:
1.2 provos 406: void
407: packet_read_expect(int *payload_len_ptr, int expected_type)
1.1 deraadt 408: {
409: int type;
410:
411: type = packet_read(payload_len_ptr);
412: if (type != expected_type)
413: packet_disconnect("Protocol error: expected packet type %d, got %d",
414: expected_type, type);
415: }
416:
417: /* Checks if a full packet is available in the data received so far via
418: packet_process_incoming. If so, reads the packet; otherwise returns
419: SSH_MSG_NONE. This does not wait for data from the connection.
420:
421: SSH_MSG_DISCONNECT is handled specially here. Also,
422: SSH_MSG_IGNORE messages are skipped by this function and are never returned
423: to higher levels.
424:
425: The returned payload_len does include space consumed by:
426: Packet length
427: Padding
428: Packet type
429: Check bytes
430:
431:
432: */
433:
1.2 provos 434: int
435: packet_read_poll(int *payload_len_ptr)
1.1 deraadt 436: {
437: unsigned int len, padded_len;
438: unsigned char *ucp;
439: char buf[8], *cp;
440: unsigned long checksum, stored_checksum;
441:
442: restart:
443:
444: /* Check if input size is less than minimum packet size. */
445: if (buffer_len(&input) < 4 + 8)
446: return SSH_MSG_NONE;
447: /* Get length of incoming packet. */
448: ucp = (unsigned char *)buffer_ptr(&input);
449: len = GET_32BIT(ucp);
450: if (len < 1 + 2 + 2 || len > 256*1024)
451: packet_disconnect("Bad packet length %d.", len);
452: padded_len = (len + 8) & ~7;
453:
454: /* Check if the packet has been entirely received. */
455: if (buffer_len(&input) < 4 + padded_len)
456: return SSH_MSG_NONE;
457:
458: /* The entire packet is in buffer. */
459:
460: /* Consume packet length. */
461: buffer_consume(&input, 4);
462:
463: /* Copy data to incoming_packet. */
464: buffer_clear(&incoming_packet);
465: buffer_append_space(&incoming_packet, &cp, padded_len);
466: packet_decrypt(&receive_context, cp, buffer_ptr(&input), padded_len);
467: buffer_consume(&input, padded_len);
468:
469: #ifdef PACKET_DEBUG
470: fprintf(stderr, "read_poll plain: "); buffer_dump(&incoming_packet);
471: #endif
472:
473: /* Compute packet checksum. */
474: checksum = crc32((unsigned char *)buffer_ptr(&incoming_packet),
475: buffer_len(&incoming_packet) - 4);
476:
477: /* Skip padding. */
478: buffer_consume(&incoming_packet, 8 - len % 8);
479:
480: /* Test check bytes. */
481: assert(len == buffer_len(&incoming_packet));
482: ucp = (unsigned char *)buffer_ptr(&incoming_packet) + len - 4;
483: stored_checksum = GET_32BIT(ucp);
484: if (checksum != stored_checksum)
485: packet_disconnect("Corrupted check bytes on input.");
486: buffer_consume_end(&incoming_packet, 4);
487:
488: /* If using packet compression, decompress the packet. */
489: if (packet_compression)
490: {
491: buffer_clear(&compression_buffer);
492: buffer_uncompress(&incoming_packet, &compression_buffer);
493: buffer_clear(&incoming_packet);
494: buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
495: buffer_len(&compression_buffer));
496: }
497:
498: /* Get packet type. */
499: buffer_get(&incoming_packet, &buf[0], 1);
500:
501: /* Return length of payload (without type field). */
502: *payload_len_ptr = buffer_len(&incoming_packet);
503:
504: /* Handle disconnect message. */
505: if ((unsigned char)buf[0] == SSH_MSG_DISCONNECT)
506: fatal("%.900s", packet_get_string(NULL));
507:
508: /* Ignore ignore messages. */
509: if ((unsigned char)buf[0] == SSH_MSG_IGNORE)
510: goto restart;
511:
512: /* Send debug messages as debugging output. */
513: if ((unsigned char)buf[0] == SSH_MSG_DEBUG)
514: {
515: debug("Remote: %.900s", packet_get_string(NULL));
516: goto restart;
517: }
518:
519: /* Return type. */
520: return (unsigned char)buf[0];
521: }
522:
523: /* Buffers the given amount of input characters. This is intended to be
524: used together with packet_read_poll. */
525:
1.2 provos 526: void
527: packet_process_incoming(const char *buf, unsigned int len)
1.1 deraadt 528: {
529: buffer_append(&input, buf, len);
530: }
531:
532: /* Returns a character from the packet. */
533:
1.2 provos 534: unsigned int
535: packet_get_char()
1.1 deraadt 536: {
537: char ch;
538: buffer_get(&incoming_packet, &ch, 1);
539: return (unsigned char)ch;
540: }
541:
542: /* Returns an integer from the packet data. */
543:
1.2 provos 544: unsigned int
545: packet_get_int()
1.1 deraadt 546: {
547: return buffer_get_int(&incoming_packet);
548: }
549:
550: /* Returns an arbitrary precision integer from the packet data. The integer
551: must have been initialized before this call. */
552:
1.2 provos 553: void
554: packet_get_bignum(BIGNUM *value, int *length_ptr)
1.1 deraadt 555: {
1.2 provos 556: *length_ptr = buffer_get_bignum(&incoming_packet, value);
1.1 deraadt 557: }
558:
559: /* Returns a string from the packet data. The string is allocated using
560: xmalloc; it is the responsibility of the calling program to free it when
561: no longer needed. The length_ptr argument may be NULL, or point to an
562: integer into which the length of the string is stored. */
563:
1.2 provos 564: char
565: *packet_get_string(unsigned int *length_ptr)
1.1 deraadt 566: {
567: return buffer_get_string(&incoming_packet, length_ptr);
568: }
569:
570: /* Sends a diagnostic message from the server to the client. This message
571: can be sent at any time (but not while constructing another message).
572: The message is printed immediately, but only if the client is being
573: executed in verbose mode. These messages are primarily intended to
574: ease debugging authentication problems. The length of the formatted
575: message must not exceed 1024 bytes. This will automatically call
576: packet_write_wait. */
577:
1.2 provos 578: void
579: packet_send_debug(const char *fmt, ...)
1.1 deraadt 580: {
581: char buf[1024];
582: va_list args;
583:
584: va_start(args, fmt);
585: vsnprintf(buf, sizeof(buf), fmt, args);
586: va_end(args);
587:
588: packet_start(SSH_MSG_DEBUG);
589: packet_put_string(buf, strlen(buf));
590: packet_send();
591: packet_write_wait();
592: }
593:
594: /* Logs the error plus constructs and sends a disconnect
595: packet, closes the connection, and exits. This function never returns.
596: The error message should not contain a newline. The length of the
597: formatted message must not exceed 1024 bytes. */
598:
1.2 provos 599: void
600: packet_disconnect(const char *fmt, ...)
1.1 deraadt 601: {
602: char buf[1024];
603: va_list args;
604: static int disconnecting = 0;
605: if (disconnecting) /* Guard against recursive invocations. */
606: fatal("packet_disconnect called recursively.");
607: disconnecting = 1;
608:
609: /* Format the message. Note that the caller must make sure the message
610: is of limited size. */
611: va_start(args, fmt);
612: vsnprintf(buf, sizeof(buf), fmt, args);
613: va_end(args);
614:
615: /* Send the disconnect message to the other side, and wait for it to get
616: sent. */
617: packet_start(SSH_MSG_DISCONNECT);
618: packet_put_string(buf, strlen(buf));
619: packet_send();
620: packet_write_wait();
621:
622: /* Stop listening for connections. */
623: channel_stop_listening();
624:
625: /* Close the connection. */
626: packet_close();
627:
628: /* Display the error locally and exit. */
629: fatal("Local: %.100s", buf);
630: }
631:
632: /* Checks if there is any buffered output, and tries to write some of the
633: output. */
634:
1.2 provos 635: void
636: packet_write_poll()
1.1 deraadt 637: {
638: int len = buffer_len(&output);
639: if (len > 0)
640: {
641: len = write(connection_out, buffer_ptr(&output), len);
1.2 provos 642: if (len <= 0) {
1.1 deraadt 643: if (errno == EAGAIN)
644: return;
645: else
646: fatal("Write failed: %.100s", strerror(errno));
1.2 provos 647: }
1.1 deraadt 648: buffer_consume(&output, len);
649: }
650: }
651:
652: /* Calls packet_write_poll repeatedly until all pending output data has
653: been written. */
654:
1.2 provos 655: void
656: packet_write_wait()
1.1 deraadt 657: {
658: packet_write_poll();
659: while (packet_have_data_to_write())
660: {
661: fd_set set;
662: FD_ZERO(&set);
663: FD_SET(connection_out, &set);
664: select(connection_out + 1, NULL, &set, NULL, NULL);
665: packet_write_poll();
666: }
667: }
668:
669: /* Returns true if there is buffered data to write to the connection. */
670:
1.2 provos 671: int
672: packet_have_data_to_write()
1.1 deraadt 673: {
674: return buffer_len(&output) != 0;
675: }
676:
677: /* Returns true if there is not too much data to write to the connection. */
678:
1.2 provos 679: int
680: packet_not_very_much_data_to_write()
1.1 deraadt 681: {
682: if (interactive_mode)
683: return buffer_len(&output) < 16384;
684: else
685: return buffer_len(&output) < 128*1024;
686: }
687:
688: /* Informs that the current session is interactive. Sets IP flags for that. */
689:
1.2 provos 690: void
691: packet_set_interactive(int interactive, int keepalives)
1.1 deraadt 692: {
693: int on = 1;
694:
695: /* Record that we are in interactive mode. */
696: interactive_mode = interactive;
697:
698: /* Only set socket options if using a socket (as indicated by the descriptors
699: being the same). */
700: if (connection_in != connection_out)
701: return;
702:
703: if (keepalives)
704: {
705: /* Set keepalives if requested. */
706: if (setsockopt(connection_in, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
707: sizeof(on)) < 0)
708: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
709: }
710:
711: if (interactive)
712: {
713: /* Set IP options for an interactive connection. Use IPTOS_LOWDELAY
714: and TCP_NODELAY. */
715: int lowdelay = IPTOS_LOWDELAY;
716: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *)&lowdelay,
717: sizeof(lowdelay)) < 0)
718: error("setsockopt IPTOS_LOWDELAY: %.100s", strerror(errno));
719: if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *)&on,
720: sizeof(on)) < 0)
721: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
722: }
723: else
724: {
725: /* Set IP options for a non-interactive connection. Use
726: IPTOS_THROUGHPUT. */
727: int throughput = IPTOS_THROUGHPUT;
728: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *)&throughput,
729: sizeof(throughput)) < 0)
730: error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno));
731: }
732: }
733:
734: /* Returns true if the current connection is interactive. */
735:
1.2 provos 736: int
737: packet_is_interactive()
1.1 deraadt 738: {
739: return interactive_mode;
740: }
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