Annotation of src/usr.bin/ssh/packet.c, Revision 1.46
1.1 deraadt 1: /*
1.15 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.35 deraadt 5: * This file contains code implementing the packet protocol and communication
6: * with the other side. This same code is used both on client and server side.
1.29 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
1.29 markus 13: *
1.25 markus 14: *
15: * SSH2 packet format added by Markus Friedl.
1.35 deraadt 16: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.25 markus 17: *
1.35 deraadt 18: * Redistribution and use in source and binary forms, with or without
19: * modification, are permitted provided that the following conditions
20: * are met:
21: * 1. Redistributions of source code must retain the above copyright
22: * notice, this list of conditions and the following disclaimer.
23: * 2. Redistributions in binary form must reproduce the above copyright
24: * notice, this list of conditions and the following disclaimer in the
25: * documentation and/or other materials provided with the distribution.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
28: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
32: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.15 deraadt 37: */
1.1 deraadt 38:
39: #include "includes.h"
1.46 ! markus 40: RCSID("$OpenBSD: packet.c,v 1.45 2001/01/19 15:55:11 markus Exp $");
1.1 deraadt 41:
42: #include "xmalloc.h"
43: #include "buffer.h"
44: #include "packet.h"
45: #include "bufaux.h"
46: #include "crc32.h"
47: #include "getput.h"
48:
49: #include "compress.h"
1.9 dugsong 50: #include "deattack.h"
1.23 markus 51: #include "channels.h"
1.1 deraadt 52:
1.25 markus 53: #include "compat.h"
1.45 markus 54: #include "ssh1.h"
1.25 markus 55: #include "ssh2.h"
56:
1.27 markus 57: #include <openssl/bn.h>
58: #include <openssl/dh.h>
59: #include <openssl/hmac.h>
1.25 markus 60: #include "buffer.h"
1.37 markus 61: #include "cipher.h"
1.25 markus 62: #include "kex.h"
63: #include "hmac.h"
1.46 ! markus 64: #include "log.h"
! 65: #include "canohost.h"
1.25 markus 66:
67: #ifdef PACKET_DEBUG
68: #define DBG(x) x
69: #else
70: #define DBG(x)
71: #endif
72:
1.16 markus 73: /*
74: * This variable contains the file descriptors used for communicating with
75: * the other side. connection_in is used for reading; connection_out for
76: * writing. These can be the same descriptor, in which case it is assumed to
77: * be a socket.
78: */
1.1 deraadt 79: static int connection_in = -1;
80: static int connection_out = -1;
81:
1.16 markus 82: /*
83: * Cipher type. This value is only used to determine whether to pad the
84: * packets with zeroes or random data.
85: */
1.1 deraadt 86: static int cipher_type = SSH_CIPHER_NONE;
87:
88: /* Protocol flags for the remote side. */
1.40 markus 89: static u_int remote_protocol_flags = 0;
1.1 deraadt 90:
91: /* Encryption context for receiving data. This is only used for decryption. */
92: static CipherContext receive_context;
1.14 markus 93:
94: /* Encryption context for sending data. This is only used for encryption. */
1.1 deraadt 95: static CipherContext send_context;
96:
97: /* Buffer for raw input data from the socket. */
98: static Buffer input;
99:
100: /* Buffer for raw output data going to the socket. */
101: static Buffer output;
102:
103: /* Buffer for the partial outgoing packet being constructed. */
104: static Buffer outgoing_packet;
105:
106: /* Buffer for the incoming packet currently being processed. */
107: static Buffer incoming_packet;
108:
109: /* Scratch buffer for packet compression/decompression. */
110: static Buffer compression_buffer;
111:
112: /* Flag indicating whether packet compression/decompression is enabled. */
113: static int packet_compression = 0;
114:
1.12 markus 115: /* default maximum packet size */
116: int max_packet_size = 32768;
117:
1.1 deraadt 118: /* Flag indicating whether this module has been initialized. */
119: static int initialized = 0;
120:
121: /* Set to true if the connection is interactive. */
122: static int interactive_mode = 0;
123:
1.25 markus 124: /* True if SSH2 packet format is used */
125: int use_ssh2_packet_format = 0;
126:
127: /* Session key information for Encryption and MAC */
128: Kex *kex = NULL;
129:
130: void
131: packet_set_kex(Kex *k)
132: {
133: if( k->mac[MODE_IN ].key == NULL ||
134: k->enc[MODE_IN ].key == NULL ||
135: k->enc[MODE_IN ].iv == NULL ||
136: k->mac[MODE_OUT].key == NULL ||
137: k->enc[MODE_OUT].key == NULL ||
138: k->enc[MODE_OUT].iv == NULL)
139: fatal("bad KEX");
140: kex = k;
141: }
142: void
143: clear_enc_keys(Enc *enc, int len)
144: {
145: memset(enc->iv, 0, len);
146: memset(enc->key, 0, len);
147: xfree(enc->iv);
148: xfree(enc->key);
149: enc->iv = NULL;
150: enc->key = NULL;
151: }
152: void
153: packet_set_ssh2_format(void)
154: {
1.31 markus 155: DBG(debug("use_ssh2_packet_format"));
1.25 markus 156: use_ssh2_packet_format = 1;
157: }
158:
1.16 markus 159: /*
160: * Sets the descriptors used for communication. Disables encryption until
161: * packet_set_encryption_key is called.
162: */
1.2 provos 163: void
164: packet_set_connection(int fd_in, int fd_out)
1.1 deraadt 165: {
1.37 markus 166: Cipher *none = cipher_by_name("none");
167: if (none == NULL)
168: fatal("packet_set_connection: cannot load cipher 'none'");
1.14 markus 169: connection_in = fd_in;
170: connection_out = fd_out;
171: cipher_type = SSH_CIPHER_NONE;
1.40 markus 172: cipher_init(&send_context, none, (u_char *) "", 0, NULL, 0);
173: cipher_init(&receive_context, none, (u_char *) "", 0, NULL, 0);
1.14 markus 174: if (!initialized) {
175: initialized = 1;
176: buffer_init(&input);
177: buffer_init(&output);
178: buffer_init(&outgoing_packet);
179: buffer_init(&incoming_packet);
180: }
181: /* Kludge: arrange the close function to be called from fatal(). */
182: fatal_add_cleanup((void (*) (void *)) packet_close, NULL);
1.1 deraadt 183: }
184:
1.19 markus 185: /* Returns 1 if remote host is connected via socket, 0 if not. */
186:
187: int
188: packet_connection_is_on_socket()
189: {
190: struct sockaddr_storage from, to;
191: socklen_t fromlen, tolen;
192:
193: /* filedescriptors in and out are the same, so it's a socket */
194: if (connection_in == connection_out)
195: return 1;
196: fromlen = sizeof(from);
197: memset(&from, 0, sizeof(from));
1.20 markus 198: if (getpeername(connection_in, (struct sockaddr *)&from, &fromlen) < 0)
1.19 markus 199: return 0;
200: tolen = sizeof(to);
201: memset(&to, 0, sizeof(to));
1.20 markus 202: if (getpeername(connection_out, (struct sockaddr *)&to, &tolen) < 0)
1.19 markus 203: return 0;
204: if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
205: return 0;
206: if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
207: return 0;
208: return 1;
209: }
210:
211: /* returns 1 if connection is via ipv4 */
212:
213: int
214: packet_connection_is_ipv4()
215: {
216: struct sockaddr_storage to;
1.21 deraadt 217: socklen_t tolen = sizeof(to);
1.19 markus 218:
219: memset(&to, 0, sizeof(to));
220: if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
221: return 0;
222: if (to.ss_family != AF_INET)
223: return 0;
224: return 1;
225: }
226:
1.1 deraadt 227: /* Sets the connection into non-blocking mode. */
228:
1.2 provos 229: void
230: packet_set_nonblocking()
1.1 deraadt 231: {
1.14 markus 232: /* Set the socket into non-blocking mode. */
233: if (fcntl(connection_in, F_SETFL, O_NONBLOCK) < 0)
234: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
235:
236: if (connection_out != connection_in) {
237: if (fcntl(connection_out, F_SETFL, O_NONBLOCK) < 0)
238: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
239: }
1.1 deraadt 240: }
241:
242: /* Returns the socket used for reading. */
243:
1.2 provos 244: int
245: packet_get_connection_in()
1.1 deraadt 246: {
1.14 markus 247: return connection_in;
1.1 deraadt 248: }
249:
250: /* Returns the descriptor used for writing. */
251:
1.2 provos 252: int
253: packet_get_connection_out()
1.1 deraadt 254: {
1.14 markus 255: return connection_out;
1.1 deraadt 256: }
257:
258: /* Closes the connection and clears and frees internal data structures. */
259:
1.2 provos 260: void
261: packet_close()
1.1 deraadt 262: {
1.14 markus 263: if (!initialized)
264: return;
265: initialized = 0;
266: if (connection_in == connection_out) {
267: shutdown(connection_out, SHUT_RDWR);
268: close(connection_out);
269: } else {
270: close(connection_in);
271: close(connection_out);
272: }
273: buffer_free(&input);
274: buffer_free(&output);
275: buffer_free(&outgoing_packet);
276: buffer_free(&incoming_packet);
277: if (packet_compression) {
278: buffer_free(&compression_buffer);
279: buffer_compress_uninit();
280: }
1.1 deraadt 281: }
282:
283: /* Sets remote side protocol flags. */
284:
1.2 provos 285: void
1.40 markus 286: packet_set_protocol_flags(u_int protocol_flags)
1.1 deraadt 287: {
1.14 markus 288: remote_protocol_flags = protocol_flags;
289: channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0);
1.1 deraadt 290: }
291:
292: /* Returns the remote protocol flags set earlier by the above function. */
293:
1.40 markus 294: u_int
1.2 provos 295: packet_get_protocol_flags()
1.1 deraadt 296: {
1.14 markus 297: return remote_protocol_flags;
1.1 deraadt 298: }
299:
1.16 markus 300: /*
301: * Starts packet compression from the next packet on in both directions.
302: * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
303: */
1.1 deraadt 304:
1.25 markus 305: /*** XXXXX todo: kex means re-init */
1.2 provos 306: void
307: packet_start_compression(int level)
1.1 deraadt 308: {
1.14 markus 309: if (packet_compression)
310: fatal("Compression already enabled.");
311: packet_compression = 1;
312: buffer_init(&compression_buffer);
313: buffer_compress_init(level);
1.1 deraadt 314: }
315:
1.16 markus 316: /*
317: * Encrypts the given number of bytes, copying from src to dest. bytes is
318: * known to be a multiple of 8.
319: */
1.1 deraadt 320:
1.2 provos 321: void
1.14 markus 322: packet_encrypt(CipherContext * cc, void *dest, void *src,
1.40 markus 323: u_int bytes)
1.1 deraadt 324: {
1.14 markus 325: cipher_encrypt(cc, dest, src, bytes);
1.1 deraadt 326: }
327:
1.16 markus 328: /*
329: * Decrypts the given number of bytes, copying from src to dest. bytes is
330: * known to be a multiple of 8.
331: */
1.1 deraadt 332:
1.2 provos 333: void
1.40 markus 334: packet_decrypt(CipherContext *context, void *dest, void *src, u_int bytes)
1.1 deraadt 335: {
1.16 markus 336: /*
337: * Cryptographic attack detector for ssh - Modifications for packet.c
338: * (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com)
339: */
1.37 markus 340: if (!compat20 &&
341: context->cipher->number != SSH_CIPHER_NONE &&
342: detect_attack(src, bytes, NULL) == DEATTACK_DETECTED)
1.14 markus 343: packet_disconnect("crc32 compensation attack: network attack detected");
344:
1.37 markus 345: cipher_decrypt(context, dest, src, bytes);
1.1 deraadt 346: }
347:
1.16 markus 348: /*
349: * Causes any further packets to be encrypted using the given key. The same
350: * key is used for both sending and reception. However, both directions are
351: * encrypted independently of each other.
352: */
1.1 deraadt 353:
1.2 provos 354: void
1.40 markus 355: packet_set_encryption_key(const u_char *key, u_int keylen,
1.37 markus 356: int number)
1.1 deraadt 357: {
1.37 markus 358: Cipher *cipher = cipher_by_number(number);
359: if (cipher == NULL)
360: fatal("packet_set_encryption_key: unknown cipher number %d", number);
1.25 markus 361: if (keylen < 20)
1.37 markus 362: fatal("packet_set_encryption_key: keylen too small: %d", keylen);
363: cipher_init(&receive_context, cipher, key, keylen, NULL, 0);
364: cipher_init(&send_context, cipher, key, keylen, NULL, 0);
1.1 deraadt 365: }
366:
367: /* Starts constructing a packet to send. */
368:
1.2 provos 369: void
1.25 markus 370: packet_start1(int type)
1.1 deraadt 371: {
1.14 markus 372: char buf[9];
1.1 deraadt 373:
1.14 markus 374: buffer_clear(&outgoing_packet);
375: memset(buf, 0, 8);
376: buf[8] = type;
377: buffer_append(&outgoing_packet, buf, 9);
1.1 deraadt 378: }
379:
1.25 markus 380: void
381: packet_start2(int type)
382: {
383: char buf[4+1+1];
384:
385: buffer_clear(&outgoing_packet);
386: memset(buf, 0, sizeof buf);
387: /* buf[0..3] = payload_len; */
388: /* buf[4] = pad_len; */
389: buf[5] = type & 0xff;
390: buffer_append(&outgoing_packet, buf, sizeof buf);
391: }
392:
393: void
394: packet_start(int type)
395: {
396: DBG(debug("packet_start[%d]",type));
397: if (use_ssh2_packet_format)
398: packet_start2(type);
399: else
400: packet_start1(type);
401: }
402:
1.1 deraadt 403: /* Appends a character to the packet data. */
404:
1.2 provos 405: void
406: packet_put_char(int value)
1.1 deraadt 407: {
1.14 markus 408: char ch = value;
409: buffer_append(&outgoing_packet, &ch, 1);
1.1 deraadt 410: }
411:
412: /* Appends an integer to the packet data. */
413:
1.2 provos 414: void
1.40 markus 415: packet_put_int(u_int value)
1.1 deraadt 416: {
1.14 markus 417: buffer_put_int(&outgoing_packet, value);
1.1 deraadt 418: }
419:
420: /* Appends a string to packet data. */
421:
1.2 provos 422: void
1.40 markus 423: packet_put_string(const char *buf, u_int len)
1.1 deraadt 424: {
1.14 markus 425: buffer_put_string(&outgoing_packet, buf, len);
1.1 deraadt 426: }
1.24 markus 427: void
428: packet_put_cstring(const char *str)
429: {
430: buffer_put_string(&outgoing_packet, str, strlen(str));
431: }
432:
433: void
1.40 markus 434: packet_put_raw(const char *buf, u_int len)
1.24 markus 435: {
436: buffer_append(&outgoing_packet, buf, len);
437: }
438:
1.1 deraadt 439:
440: /* Appends an arbitrary precision integer to packet data. */
441:
1.2 provos 442: void
1.14 markus 443: packet_put_bignum(BIGNUM * value)
1.1 deraadt 444: {
1.14 markus 445: buffer_put_bignum(&outgoing_packet, value);
1.1 deraadt 446: }
1.24 markus 447: void
448: packet_put_bignum2(BIGNUM * value)
449: {
450: buffer_put_bignum2(&outgoing_packet, value);
451: }
1.1 deraadt 452:
1.16 markus 453: /*
454: * Finalizes and sends the packet. If the encryption key has been set,
455: * encrypts the packet before sending.
456: */
1.14 markus 457:
1.2 provos 458: void
1.25 markus 459: packet_send1()
1.1 deraadt 460: {
1.14 markus 461: char buf[8], *cp;
462: int i, padding, len;
1.40 markus 463: u_int checksum;
1.14 markus 464: u_int32_t rand = 0;
465:
1.16 markus 466: /*
467: * If using packet compression, compress the payload of the outgoing
468: * packet.
469: */
1.14 markus 470: if (packet_compression) {
471: buffer_clear(&compression_buffer);
472: /* Skip padding. */
473: buffer_consume(&outgoing_packet, 8);
474: /* padding */
475: buffer_append(&compression_buffer, "\0\0\0\0\0\0\0\0", 8);
476: buffer_compress(&outgoing_packet, &compression_buffer);
477: buffer_clear(&outgoing_packet);
478: buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
479: buffer_len(&compression_buffer));
480: }
481: /* Compute packet length without padding (add checksum, remove padding). */
482: len = buffer_len(&outgoing_packet) + 4 - 8;
483:
1.32 markus 484: /* Insert padding. Initialized to zero in packet_start1() */
1.14 markus 485: padding = 8 - len % 8;
486: if (cipher_type != SSH_CIPHER_NONE) {
487: cp = buffer_ptr(&outgoing_packet);
488: for (i = 0; i < padding; i++) {
489: if (i % 4 == 0)
490: rand = arc4random();
491: cp[7 - i] = rand & 0xff;
492: rand >>= 8;
493: }
494: }
495: buffer_consume(&outgoing_packet, 8 - padding);
496:
497: /* Add check bytes. */
1.40 markus 498: checksum = ssh_crc32((u_char *) buffer_ptr(&outgoing_packet),
1.34 deraadt 499: buffer_len(&outgoing_packet));
1.14 markus 500: PUT_32BIT(buf, checksum);
501: buffer_append(&outgoing_packet, buf, 4);
1.1 deraadt 502:
503: #ifdef PACKET_DEBUG
1.14 markus 504: fprintf(stderr, "packet_send plain: ");
505: buffer_dump(&outgoing_packet);
1.1 deraadt 506: #endif
507:
1.14 markus 508: /* Append to output. */
509: PUT_32BIT(buf, len);
510: buffer_append(&output, buf, 4);
511: buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
512: packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
513: buffer_len(&outgoing_packet));
514:
1.1 deraadt 515: #ifdef PACKET_DEBUG
1.14 markus 516: fprintf(stderr, "encrypted: ");
517: buffer_dump(&output);
1.1 deraadt 518: #endif
519:
1.14 markus 520: buffer_clear(&outgoing_packet);
1.1 deraadt 521:
1.16 markus 522: /*
523: * Note that the packet is now only buffered in output. It won\'t be
524: * actually sent until packet_write_wait or packet_write_poll is
525: * called.
526: */
1.1 deraadt 527: }
528:
1.16 markus 529: /*
1.25 markus 530: * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
531: */
532: void
533: packet_send2()
534: {
1.40 markus 535: u_char *macbuf = NULL;
1.25 markus 536: char *cp;
1.40 markus 537: u_int packet_length = 0;
538: u_int i, padlen, len;
1.25 markus 539: u_int32_t rand = 0;
1.40 markus 540: static u_int seqnr = 0;
1.25 markus 541: int type;
542: Enc *enc = NULL;
543: Mac *mac = NULL;
544: Comp *comp = NULL;
545: int block_size;
546:
547: if (kex != NULL) {
548: enc = &kex->enc[MODE_OUT];
549: mac = &kex->mac[MODE_OUT];
550: comp = &kex->comp[MODE_OUT];
551: }
1.37 markus 552: block_size = enc ? enc->cipher->block_size : 8;
1.25 markus 553:
554: cp = buffer_ptr(&outgoing_packet);
555: type = cp[5] & 0xff;
556:
557: #ifdef PACKET_DEBUG
558: fprintf(stderr, "plain: ");
559: buffer_dump(&outgoing_packet);
560: #endif
561:
562: if (comp && comp->enabled) {
563: len = buffer_len(&outgoing_packet);
564: /* skip header, compress only payload */
565: buffer_consume(&outgoing_packet, 5);
566: buffer_clear(&compression_buffer);
567: buffer_compress(&outgoing_packet, &compression_buffer);
568: buffer_clear(&outgoing_packet);
569: buffer_append(&outgoing_packet, "\0\0\0\0\0", 5);
570: buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
571: buffer_len(&compression_buffer));
572: DBG(debug("compression: raw %d compressed %d", len,
573: buffer_len(&outgoing_packet)));
574: }
575:
576: /* sizeof (packet_len + pad_len + payload) */
577: len = buffer_len(&outgoing_packet);
578:
579: /*
580: * calc size of padding, alloc space, get random data,
581: * minimum padding is 4 bytes
582: */
583: padlen = block_size - (len % block_size);
584: if (padlen < 4)
585: padlen += block_size;
586: buffer_append_space(&outgoing_packet, &cp, padlen);
1.38 markus 587: if (enc && enc->cipher->number != SSH_CIPHER_NONE) {
1.32 markus 588: /* random padding */
1.25 markus 589: for (i = 0; i < padlen; i++) {
590: if (i % 4 == 0)
591: rand = arc4random();
592: cp[i] = rand & 0xff;
593: rand <<= 8;
594: }
1.32 markus 595: } else {
596: /* clear padding */
597: memset(cp, 0, padlen);
1.25 markus 598: }
599: /* packet_length includes payload, padding and padding length field */
600: packet_length = buffer_len(&outgoing_packet) - 4;
601: cp = buffer_ptr(&outgoing_packet);
602: PUT_32BIT(cp, packet_length);
603: cp[4] = padlen & 0xff;
604: DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
605:
606: /* compute MAC over seqnr and packet(length fields, payload, padding) */
607: if (mac && mac->enabled) {
608: macbuf = hmac( mac->md, seqnr,
1.40 markus 609: (u_char *) buffer_ptr(&outgoing_packet),
1.25 markus 610: buffer_len(&outgoing_packet),
611: mac->key, mac->key_len
612: );
1.36 markus 613: DBG(debug("done calc MAC out #%d", seqnr));
1.25 markus 614: }
615: /* encrypt packet and append to output buffer. */
616: buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
617: packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
618: buffer_len(&outgoing_packet));
619: /* append unencrypted MAC */
620: if (mac && mac->enabled)
621: buffer_append(&output, (char *)macbuf, mac->mac_len);
622: #ifdef PACKET_DEBUG
623: fprintf(stderr, "encrypted: ");
624: buffer_dump(&output);
625: #endif
1.29 markus 626: /* increment sequence number for outgoing packets */
627: if (++seqnr == 0)
628: log("outgoing seqnr wraps around");
1.25 markus 629: buffer_clear(&outgoing_packet);
630:
631: if (type == SSH2_MSG_NEWKEYS) {
632: if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
633: fatal("packet_send2: no KEX");
634: if (mac->md != NULL)
635: mac->enabled = 1;
1.37 markus 636: DBG(debug("cipher_init send_context"));
637: cipher_init(&send_context, enc->cipher,
638: enc->key, enc->cipher->key_len,
639: enc->iv, enc->cipher->block_size);
1.25 markus 640: clear_enc_keys(enc, kex->we_need);
641: if (comp->type != 0 && comp->enabled == 0) {
642: comp->enabled = 1;
643: if (! packet_compression)
644: packet_start_compression(6);
645: }
646: }
647: }
648:
649: void
650: packet_send()
651: {
652: if (use_ssh2_packet_format)
653: packet_send2();
654: else
655: packet_send1();
656: DBG(debug("packet_send done"));
657: }
658:
659: /*
1.16 markus 660: * Waits until a packet has been received, and returns its type. Note that
661: * no other data is processed until this returns, so this function should not
662: * be used during the interactive session.
663: */
1.1 deraadt 664:
1.2 provos 665: int
666: packet_read(int *payload_len_ptr)
1.1 deraadt 667: {
1.14 markus 668: int type, len;
669: fd_set set;
670: char buf[8192];
1.25 markus 671: DBG(debug("packet_read()"));
1.14 markus 672:
673: /* Since we are blocking, ensure that all written packets have been sent. */
674: packet_write_wait();
675:
676: /* Stay in the loop until we have received a complete packet. */
677: for (;;) {
678: /* Try to read a packet from the buffer. */
679: type = packet_read_poll(payload_len_ptr);
1.32 markus 680: if (!use_ssh2_packet_format && (
681: type == SSH_SMSG_SUCCESS
1.14 markus 682: || type == SSH_SMSG_FAILURE
683: || type == SSH_CMSG_EOF
1.32 markus 684: || type == SSH_CMSG_EXIT_CONFIRMATION))
1.14 markus 685: packet_integrity_check(*payload_len_ptr, 0, type);
686: /* If we got a packet, return it. */
687: if (type != SSH_MSG_NONE)
688: return type;
1.16 markus 689: /*
690: * Otherwise, wait for some data to arrive, add it to the
691: * buffer, and try again.
692: */
1.14 markus 693: FD_ZERO(&set);
694: FD_SET(connection_in, &set);
1.16 markus 695:
1.14 markus 696: /* Wait for some data to arrive. */
697: select(connection_in + 1, &set, NULL, NULL, NULL);
1.16 markus 698:
1.14 markus 699: /* Read data from the socket. */
700: len = read(connection_in, buf, sizeof(buf));
1.18 markus 701: if (len == 0) {
702: log("Connection closed by %.200s", get_remote_ipaddr());
703: fatal_cleanup();
704: }
1.14 markus 705: if (len < 0)
706: fatal("Read from socket failed: %.100s", strerror(errno));
707: /* Append it to the buffer. */
708: packet_process_incoming(buf, len);
709: }
710: /* NOTREACHED */
1.1 deraadt 711: }
712:
1.16 markus 713: /*
714: * Waits until a packet has been received, verifies that its type matches
715: * that given, and gives a fatal error and exits if there is a mismatch.
716: */
1.1 deraadt 717:
1.2 provos 718: void
719: packet_read_expect(int *payload_len_ptr, int expected_type)
1.1 deraadt 720: {
1.14 markus 721: int type;
1.1 deraadt 722:
1.14 markus 723: type = packet_read(payload_len_ptr);
724: if (type != expected_type)
725: packet_disconnect("Protocol error: expected packet type %d, got %d",
1.25 markus 726: expected_type, type);
1.1 deraadt 727: }
728:
729: /* Checks if a full packet is available in the data received so far via
1.14 markus 730: * packet_process_incoming. If so, reads the packet; otherwise returns
731: * SSH_MSG_NONE. This does not wait for data from the connection.
732: *
733: * SSH_MSG_DISCONNECT is handled specially here. Also,
734: * SSH_MSG_IGNORE messages are skipped by this function and are never returned
735: * to higher levels.
736: *
737: * The returned payload_len does include space consumed by:
738: * Packet length
739: * Padding
740: * Packet type
741: * Check bytes
742: */
1.1 deraadt 743:
1.2 provos 744: int
1.25 markus 745: packet_read_poll1(int *payload_len_ptr)
1.1 deraadt 746: {
1.40 markus 747: u_int len, padded_len;
748: u_char *ucp;
1.25 markus 749: char buf[8], *cp;
1.40 markus 750: u_int checksum, stored_checksum;
1.14 markus 751:
752: /* Check if input size is less than minimum packet size. */
753: if (buffer_len(&input) < 4 + 8)
754: return SSH_MSG_NONE;
755: /* Get length of incoming packet. */
1.40 markus 756: ucp = (u_char *) buffer_ptr(&input);
1.14 markus 757: len = GET_32BIT(ucp);
758: if (len < 1 + 2 + 2 || len > 256 * 1024)
759: packet_disconnect("Bad packet length %d.", len);
760: padded_len = (len + 8) & ~7;
761:
762: /* Check if the packet has been entirely received. */
763: if (buffer_len(&input) < 4 + padded_len)
764: return SSH_MSG_NONE;
765:
766: /* The entire packet is in buffer. */
767:
768: /* Consume packet length. */
769: buffer_consume(&input, 4);
770:
771: /* Copy data to incoming_packet. */
772: buffer_clear(&incoming_packet);
773: buffer_append_space(&incoming_packet, &cp, padded_len);
774: packet_decrypt(&receive_context, cp, buffer_ptr(&input), padded_len);
775: buffer_consume(&input, padded_len);
1.1 deraadt 776:
777: #ifdef PACKET_DEBUG
1.14 markus 778: fprintf(stderr, "read_poll plain: ");
779: buffer_dump(&incoming_packet);
1.1 deraadt 780: #endif
781:
1.14 markus 782: /* Compute packet checksum. */
1.40 markus 783: checksum = ssh_crc32((u_char *) buffer_ptr(&incoming_packet),
1.25 markus 784: buffer_len(&incoming_packet) - 4);
1.14 markus 785:
786: /* Skip padding. */
787: buffer_consume(&incoming_packet, 8 - len % 8);
788:
789: /* Test check bytes. */
790:
791: if (len != buffer_len(&incoming_packet))
792: packet_disconnect("packet_read_poll: len %d != buffer_len %d.",
1.25 markus 793: len, buffer_len(&incoming_packet));
1.14 markus 794:
1.40 markus 795: ucp = (u_char *) buffer_ptr(&incoming_packet) + len - 4;
1.14 markus 796: stored_checksum = GET_32BIT(ucp);
797: if (checksum != stored_checksum)
798: packet_disconnect("Corrupted check bytes on input.");
799: buffer_consume_end(&incoming_packet, 4);
800:
801: /* If using packet compression, decompress the packet. */
802: if (packet_compression) {
803: buffer_clear(&compression_buffer);
804: buffer_uncompress(&incoming_packet, &compression_buffer);
805: buffer_clear(&incoming_packet);
806: buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
1.25 markus 807: buffer_len(&compression_buffer));
1.14 markus 808: }
809: /* Get packet type. */
810: buffer_get(&incoming_packet, &buf[0], 1);
811:
812: /* Return length of payload (without type field). */
813: *payload_len_ptr = buffer_len(&incoming_packet);
814:
815: /* Return type. */
1.40 markus 816: return (u_char) buf[0];
1.1 deraadt 817: }
1.14 markus 818:
1.25 markus 819: int
820: packet_read_poll2(int *payload_len_ptr)
821: {
1.40 markus 822: u_int padlen, need;
823: u_char buf[8], *macbuf;
824: u_char *ucp;
1.25 markus 825: char *cp;
1.40 markus 826: static u_int packet_length = 0;
827: static u_int seqnr = 0;
1.25 markus 828: int type;
829: int maclen, block_size;
830: Enc *enc = NULL;
831: Mac *mac = NULL;
832: Comp *comp = NULL;
833:
834: if (kex != NULL) {
835: enc = &kex->enc[MODE_IN];
836: mac = &kex->mac[MODE_IN];
837: comp = &kex->comp[MODE_IN];
838: }
839: maclen = mac && mac->enabled ? mac->mac_len : 0;
1.37 markus 840: block_size = enc ? enc->cipher->block_size : 8;
1.25 markus 841:
842: if (packet_length == 0) {
843: /*
844: * check if input size is less than the cipher block size,
845: * decrypt first block and extract length of incoming packet
846: */
847: if (buffer_len(&input) < block_size)
848: return SSH_MSG_NONE;
849: buffer_clear(&incoming_packet);
850: buffer_append_space(&incoming_packet, &cp, block_size);
851: packet_decrypt(&receive_context, cp, buffer_ptr(&input),
852: block_size);
1.40 markus 853: ucp = (u_char *) buffer_ptr(&incoming_packet);
1.25 markus 854: packet_length = GET_32BIT(ucp);
855: if (packet_length < 1 + 4 || packet_length > 256 * 1024) {
856: buffer_dump(&incoming_packet);
857: packet_disconnect("Bad packet length %d.", packet_length);
858: }
859: DBG(debug("input: packet len %d", packet_length+4));
860: buffer_consume(&input, block_size);
861: }
862: /* we have a partial packet of block_size bytes */
863: need = 4 + packet_length - block_size;
864: DBG(debug("partial packet %d, need %d, maclen %d", block_size,
865: need, maclen));
866: if (need % block_size != 0)
867: fatal("padding error: need %d block %d mod %d",
868: need, block_size, need % block_size);
869: /*
870: * check if the entire packet has been received and
871: * decrypt into incoming_packet
872: */
873: if (buffer_len(&input) < need + maclen)
874: return SSH_MSG_NONE;
875: #ifdef PACKET_DEBUG
876: fprintf(stderr, "read_poll enc/full: ");
877: buffer_dump(&input);
878: #endif
879: buffer_append_space(&incoming_packet, &cp, need);
880: packet_decrypt(&receive_context, cp, buffer_ptr(&input), need);
881: buffer_consume(&input, need);
882: /*
883: * compute MAC over seqnr and packet,
884: * increment sequence number for incoming packet
885: */
1.29 markus 886: if (mac && mac->enabled) {
1.25 markus 887: macbuf = hmac( mac->md, seqnr,
1.40 markus 888: (u_char *) buffer_ptr(&incoming_packet),
1.25 markus 889: buffer_len(&incoming_packet),
890: mac->key, mac->key_len
891: );
892: if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0)
1.36 markus 893: packet_disconnect("Corrupted MAC on input.");
894: DBG(debug("MAC #%d ok", seqnr));
1.25 markus 895: buffer_consume(&input, mac->mac_len);
896: }
1.29 markus 897: if (++seqnr == 0)
898: log("incoming seqnr wraps around");
1.25 markus 899:
900: /* get padlen */
901: cp = buffer_ptr(&incoming_packet) + 4;
902: padlen = *cp & 0xff;
903: DBG(debug("input: padlen %d", padlen));
904: if (padlen < 4)
905: packet_disconnect("Corrupted padlen %d on input.", padlen);
906:
907: /* skip packet size + padlen, discard padding */
908: buffer_consume(&incoming_packet, 4 + 1);
909: buffer_consume_end(&incoming_packet, padlen);
910:
911: DBG(debug("input: len before de-compress %d", buffer_len(&incoming_packet)));
912: if (comp && comp->enabled) {
913: buffer_clear(&compression_buffer);
914: buffer_uncompress(&incoming_packet, &compression_buffer);
915: buffer_clear(&incoming_packet);
916: buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
917: buffer_len(&compression_buffer));
918: DBG(debug("input: len after de-compress %d", buffer_len(&incoming_packet)));
919: }
920: /*
921: * get packet type, implies consume.
922: * return length of payload (without type field)
923: */
924: buffer_get(&incoming_packet, (char *)&buf[0], 1);
925: *payload_len_ptr = buffer_len(&incoming_packet);
926:
927: /* reset for next packet */
928: packet_length = 0;
929:
930: /* extract packet type */
1.40 markus 931: type = (u_char)buf[0];
1.25 markus 932:
933: if (type == SSH2_MSG_NEWKEYS) {
934: if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
935: fatal("packet_read_poll2: no KEX");
936: if (mac->md != NULL)
937: mac->enabled = 1;
1.37 markus 938: DBG(debug("cipher_init receive_context"));
939: cipher_init(&receive_context, enc->cipher,
940: enc->key, enc->cipher->key_len,
941: enc->iv, enc->cipher->block_size);
1.25 markus 942: clear_enc_keys(enc, kex->we_need);
943: if (comp->type != 0 && comp->enabled == 0) {
944: comp->enabled = 1;
945: if (! packet_compression)
946: packet_start_compression(6);
947: }
948: }
949:
950: #ifdef PACKET_DEBUG
951: fprintf(stderr, "read/plain[%d]:\r\n",type);
952: buffer_dump(&incoming_packet);
953: #endif
1.40 markus 954: return (u_char)type;
1.25 markus 955: }
956:
957: int
958: packet_read_poll(int *payload_len_ptr)
959: {
960: char *msg;
961: for (;;) {
962: int type = use_ssh2_packet_format ?
963: packet_read_poll2(payload_len_ptr):
964: packet_read_poll1(payload_len_ptr);
965:
966: if(compat20) {
967: int reason;
968: if (type != 0)
969: DBG(debug("received packet type %d", type));
970: switch(type) {
971: case SSH2_MSG_IGNORE:
972: break;
973: case SSH2_MSG_DEBUG:
974: packet_get_char();
975: msg = packet_get_string(NULL);
976: debug("Remote: %.900s", msg);
977: xfree(msg);
978: msg = packet_get_string(NULL);
979: xfree(msg);
980: break;
981: case SSH2_MSG_DISCONNECT:
982: reason = packet_get_int();
983: msg = packet_get_string(NULL);
1.41 markus 984: log("Received disconnect from %s: %d: %.400s", get_remote_ipaddr(),
985: reason, msg);
1.25 markus 986: xfree(msg);
987: fatal_cleanup();
988: break;
989: default:
990: return type;
991: break;
992: }
993: } else {
994: switch(type) {
995: case SSH_MSG_IGNORE:
996: break;
997: case SSH_MSG_DEBUG:
998: msg = packet_get_string(NULL);
999: debug("Remote: %.900s", msg);
1000: xfree(msg);
1001: break;
1002: case SSH_MSG_DISCONNECT:
1003: msg = packet_get_string(NULL);
1.41 markus 1004: log("Received disconnect from %s: %.400s", get_remote_ipaddr(),
1005: msg);
1.25 markus 1006: fatal_cleanup();
1007: xfree(msg);
1008: break;
1009: default:
1010: if (type != 0)
1011: DBG(debug("received packet type %d", type));
1012: return type;
1013: break;
1014: }
1015: }
1016: }
1017: }
1018:
1.16 markus 1019: /*
1020: * Buffers the given amount of input characters. This is intended to be used
1021: * together with packet_read_poll.
1022: */
1.1 deraadt 1023:
1.2 provos 1024: void
1.40 markus 1025: packet_process_incoming(const char *buf, u_int len)
1.1 deraadt 1026: {
1.14 markus 1027: buffer_append(&input, buf, len);
1.1 deraadt 1028: }
1029:
1030: /* Returns a character from the packet. */
1031:
1.40 markus 1032: u_int
1.2 provos 1033: packet_get_char()
1.1 deraadt 1034: {
1.14 markus 1035: char ch;
1036: buffer_get(&incoming_packet, &ch, 1);
1.40 markus 1037: return (u_char) ch;
1.1 deraadt 1038: }
1039:
1040: /* Returns an integer from the packet data. */
1041:
1.40 markus 1042: u_int
1.2 provos 1043: packet_get_int()
1.1 deraadt 1044: {
1.14 markus 1045: return buffer_get_int(&incoming_packet);
1.1 deraadt 1046: }
1047:
1.16 markus 1048: /*
1049: * Returns an arbitrary precision integer from the packet data. The integer
1050: * must have been initialized before this call.
1051: */
1.1 deraadt 1052:
1.2 provos 1053: void
1.14 markus 1054: packet_get_bignum(BIGNUM * value, int *length_ptr)
1.1 deraadt 1055: {
1.14 markus 1056: *length_ptr = buffer_get_bignum(&incoming_packet, value);
1.24 markus 1057: }
1058:
1059: void
1060: packet_get_bignum2(BIGNUM * value, int *length_ptr)
1061: {
1062: *length_ptr = buffer_get_bignum2(&incoming_packet, value);
1063: }
1064:
1065: char *
1066: packet_get_raw(int *length_ptr)
1067: {
1068: int bytes = buffer_len(&incoming_packet);
1069: if (length_ptr != NULL)
1070: *length_ptr = bytes;
1071: return buffer_ptr(&incoming_packet);
1.28 markus 1072: }
1073:
1074: int
1075: packet_remaining(void)
1076: {
1077: return buffer_len(&incoming_packet);
1.1 deraadt 1078: }
1079:
1.16 markus 1080: /*
1081: * Returns a string from the packet data. The string is allocated using
1082: * xmalloc; it is the responsibility of the calling program to free it when
1083: * no longer needed. The length_ptr argument may be NULL, or point to an
1084: * integer into which the length of the string is stored.
1085: */
1.1 deraadt 1086:
1.16 markus 1087: char *
1.40 markus 1088: packet_get_string(u_int *length_ptr)
1.1 deraadt 1089: {
1.14 markus 1090: return buffer_get_string(&incoming_packet, length_ptr);
1.1 deraadt 1091: }
1092:
1.16 markus 1093: /*
1094: * Sends a diagnostic message from the server to the client. This message
1095: * can be sent at any time (but not while constructing another message). The
1096: * message is printed immediately, but only if the client is being executed
1097: * in verbose mode. These messages are primarily intended to ease debugging
1098: * authentication problems. The length of the formatted message must not
1099: * exceed 1024 bytes. This will automatically call packet_write_wait.
1100: */
1.1 deraadt 1101:
1.2 provos 1102: void
1.14 markus 1103: packet_send_debug(const char *fmt,...)
1.1 deraadt 1104: {
1.14 markus 1105: char buf[1024];
1106: va_list args;
1.39 markus 1107:
1108: if (compat20 && (datafellows & SSH_BUG_DEBUG))
1109: return;
1.14 markus 1110:
1111: va_start(args, fmt);
1112: vsnprintf(buf, sizeof(buf), fmt, args);
1113: va_end(args);
1114:
1.30 markus 1115: if (compat20) {
1116: packet_start(SSH2_MSG_DEBUG);
1117: packet_put_char(0); /* bool: always display */
1118: packet_put_cstring(buf);
1119: packet_put_cstring("");
1120: } else {
1121: packet_start(SSH_MSG_DEBUG);
1122: packet_put_cstring(buf);
1123: }
1.14 markus 1124: packet_send();
1125: packet_write_wait();
1.1 deraadt 1126: }
1127:
1.16 markus 1128: /*
1129: * Logs the error plus constructs and sends a disconnect packet, closes the
1130: * connection, and exits. This function never returns. The error message
1131: * should not contain a newline. The length of the formatted message must
1132: * not exceed 1024 bytes.
1133: */
1.1 deraadt 1134:
1.2 provos 1135: void
1.14 markus 1136: packet_disconnect(const char *fmt,...)
1.1 deraadt 1137: {
1.14 markus 1138: char buf[1024];
1139: va_list args;
1140: static int disconnecting = 0;
1141: if (disconnecting) /* Guard against recursive invocations. */
1142: fatal("packet_disconnect called recursively.");
1143: disconnecting = 1;
1144:
1.16 markus 1145: /*
1146: * Format the message. Note that the caller must make sure the
1147: * message is of limited size.
1148: */
1.14 markus 1149: va_start(args, fmt);
1150: vsnprintf(buf, sizeof(buf), fmt, args);
1151: va_end(args);
1152:
1153: /* Send the disconnect message to the other side, and wait for it to get sent. */
1.25 markus 1154: if (compat20) {
1155: packet_start(SSH2_MSG_DISCONNECT);
1156: packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
1157: packet_put_cstring(buf);
1158: packet_put_cstring("");
1159: } else {
1160: packet_start(SSH_MSG_DISCONNECT);
1161: packet_put_string(buf, strlen(buf));
1162: }
1.14 markus 1163: packet_send();
1164: packet_write_wait();
1165:
1166: /* Stop listening for connections. */
1167: channel_stop_listening();
1168:
1169: /* Close the connection. */
1170: packet_close();
1.1 deraadt 1171:
1.14 markus 1172: /* Display the error locally and exit. */
1.17 markus 1173: log("Disconnecting: %.100s", buf);
1174: fatal_cleanup();
1.1 deraadt 1175: }
1176:
1.16 markus 1177: /* Checks if there is any buffered output, and tries to write some of the output. */
1.1 deraadt 1178:
1.2 provos 1179: void
1180: packet_write_poll()
1.1 deraadt 1181: {
1.14 markus 1182: int len = buffer_len(&output);
1183: if (len > 0) {
1184: len = write(connection_out, buffer_ptr(&output), len);
1185: if (len <= 0) {
1186: if (errno == EAGAIN)
1187: return;
1188: else
1189: fatal("Write failed: %.100s", strerror(errno));
1190: }
1191: buffer_consume(&output, len);
1192: }
1.1 deraadt 1193: }
1194:
1.16 markus 1195: /*
1196: * Calls packet_write_poll repeatedly until all pending output data has been
1197: * written.
1198: */
1.1 deraadt 1199:
1.2 provos 1200: void
1201: packet_write_wait()
1.1 deraadt 1202: {
1.14 markus 1203: packet_write_poll();
1204: while (packet_have_data_to_write()) {
1205: fd_set set;
1206: FD_ZERO(&set);
1207: FD_SET(connection_out, &set);
1208: select(connection_out + 1, NULL, &set, NULL, NULL);
1209: packet_write_poll();
1210: }
1.1 deraadt 1211: }
1212:
1213: /* Returns true if there is buffered data to write to the connection. */
1214:
1.2 provos 1215: int
1216: packet_have_data_to_write()
1.1 deraadt 1217: {
1.14 markus 1218: return buffer_len(&output) != 0;
1.1 deraadt 1219: }
1220:
1221: /* Returns true if there is not too much data to write to the connection. */
1222:
1.2 provos 1223: int
1224: packet_not_very_much_data_to_write()
1.1 deraadt 1225: {
1.14 markus 1226: if (interactive_mode)
1227: return buffer_len(&output) < 16384;
1228: else
1229: return buffer_len(&output) < 128 * 1024;
1.1 deraadt 1230: }
1231:
1232: /* Informs that the current session is interactive. Sets IP flags for that. */
1233:
1.2 provos 1234: void
1.43 markus 1235: packet_set_interactive(int interactive)
1.1 deraadt 1236: {
1.43 markus 1237: static int called = 0;
1.44 markus 1238: int lowdelay = IPTOS_LOWDELAY;
1239: int throughput = IPTOS_THROUGHPUT;
1240: int on = 1;
1241:
1.43 markus 1242: if (called)
1243: return;
1244: called = 1;
1.1 deraadt 1245:
1.14 markus 1246: /* Record that we are in interactive mode. */
1247: interactive_mode = interactive;
1.1 deraadt 1248:
1.19 markus 1249: /* Only set socket options if using a socket. */
1250: if (!packet_connection_is_on_socket())
1.14 markus 1251: return;
1.19 markus 1252: /*
1.42 markus 1253: * IPTOS_LOWDELAY and IPTOS_THROUGHPUT are IPv4 only
1.19 markus 1254: */
1.14 markus 1255: if (interactive) {
1.16 markus 1256: /*
1257: * Set IP options for an interactive connection. Use
1258: * IPTOS_LOWDELAY and TCP_NODELAY.
1259: */
1.42 markus 1260: if (packet_connection_is_ipv4()) {
1261: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS,
1262: (void *) &lowdelay, sizeof(lowdelay)) < 0)
1263: error("setsockopt IPTOS_LOWDELAY: %.100s",
1264: strerror(errno));
1265: }
1.14 markus 1266: if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on,
1.19 markus 1267: sizeof(on)) < 0)
1.14 markus 1268: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.42 markus 1269: } else if (packet_connection_is_ipv4()) {
1.16 markus 1270: /*
1271: * Set IP options for a non-interactive connection. Use
1272: * IPTOS_THROUGHPUT.
1273: */
1.14 markus 1274: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput,
1.19 markus 1275: sizeof(throughput)) < 0)
1.14 markus 1276: error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno));
1277: }
1.1 deraadt 1278: }
1279:
1280: /* Returns true if the current connection is interactive. */
1281:
1.2 provos 1282: int
1283: packet_is_interactive()
1.1 deraadt 1284: {
1.14 markus 1285: return interactive_mode;
1.12 markus 1286: }
1287:
1288: int
1289: packet_set_maxsize(int s)
1290: {
1.14 markus 1291: static int called = 0;
1292: if (called) {
1.25 markus 1293: log("packet_set_maxsize: called twice: old %d new %d",
1294: max_packet_size, s);
1.14 markus 1295: return -1;
1296: }
1297: if (s < 4 * 1024 || s > 1024 * 1024) {
1298: log("packet_set_maxsize: bad size %d", s);
1299: return -1;
1300: }
1301: log("packet_set_maxsize: setting to %d", s);
1302: max_packet_size = s;
1303: return s;
1.1 deraadt 1304: }
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