Annotation of src/usr.bin/ssh/packet.c, Revision 1.40
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"
1.40 ! markus 40: RCSID("$OpenBSD: packet.c,v 1.39 2000/12/06 22:58:15 markus Exp $");
1.1 deraadt 41:
42: #include "xmalloc.h"
43: #include "buffer.h"
44: #include "packet.h"
45: #include "bufaux.h"
46: #include "ssh.h"
47: #include "crc32.h"
48: #include "getput.h"
49:
50: #include "compress.h"
1.9 dugsong 51: #include "deattack.h"
1.23 markus 52: #include "channels.h"
1.1 deraadt 53:
1.25 markus 54: #include "compat.h"
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"
64:
65: #ifdef PACKET_DEBUG
66: #define DBG(x) x
67: #else
68: #define DBG(x)
69: #endif
70:
1.16 markus 71: /*
72: * This variable contains the file descriptors used for communicating with
73: * the other side. connection_in is used for reading; connection_out for
74: * writing. These can be the same descriptor, in which case it is assumed to
75: * be a socket.
76: */
1.1 deraadt 77: static int connection_in = -1;
78: static int connection_out = -1;
79:
1.16 markus 80: /*
81: * Cipher type. This value is only used to determine whether to pad the
82: * packets with zeroes or random data.
83: */
1.1 deraadt 84: static int cipher_type = SSH_CIPHER_NONE;
85:
86: /* Protocol flags for the remote side. */
1.40 ! markus 87: static u_int remote_protocol_flags = 0;
1.1 deraadt 88:
89: /* Encryption context for receiving data. This is only used for decryption. */
90: static CipherContext receive_context;
1.14 markus 91:
92: /* Encryption context for sending data. This is only used for encryption. */
1.1 deraadt 93: static CipherContext send_context;
94:
95: /* Buffer for raw input data from the socket. */
96: static Buffer input;
97:
98: /* Buffer for raw output data going to the socket. */
99: static Buffer output;
100:
101: /* Buffer for the partial outgoing packet being constructed. */
102: static Buffer outgoing_packet;
103:
104: /* Buffer for the incoming packet currently being processed. */
105: static Buffer incoming_packet;
106:
107: /* Scratch buffer for packet compression/decompression. */
108: static Buffer compression_buffer;
109:
110: /* Flag indicating whether packet compression/decompression is enabled. */
111: static int packet_compression = 0;
112:
1.12 markus 113: /* default maximum packet size */
114: int max_packet_size = 32768;
115:
1.1 deraadt 116: /* Flag indicating whether this module has been initialized. */
117: static int initialized = 0;
118:
119: /* Set to true if the connection is interactive. */
120: static int interactive_mode = 0;
121:
1.25 markus 122: /* True if SSH2 packet format is used */
123: int use_ssh2_packet_format = 0;
124:
125: /* Session key information for Encryption and MAC */
126: Kex *kex = NULL;
127:
128: void
129: packet_set_kex(Kex *k)
130: {
131: if( k->mac[MODE_IN ].key == NULL ||
132: k->enc[MODE_IN ].key == NULL ||
133: k->enc[MODE_IN ].iv == NULL ||
134: k->mac[MODE_OUT].key == NULL ||
135: k->enc[MODE_OUT].key == NULL ||
136: k->enc[MODE_OUT].iv == NULL)
137: fatal("bad KEX");
138: kex = k;
139: }
140: void
141: clear_enc_keys(Enc *enc, int len)
142: {
143: memset(enc->iv, 0, len);
144: memset(enc->key, 0, len);
145: xfree(enc->iv);
146: xfree(enc->key);
147: enc->iv = NULL;
148: enc->key = NULL;
149: }
150: void
151: packet_set_ssh2_format(void)
152: {
1.31 markus 153: DBG(debug("use_ssh2_packet_format"));
1.25 markus 154: use_ssh2_packet_format = 1;
155: }
156:
1.16 markus 157: /*
158: * Sets the descriptors used for communication. Disables encryption until
159: * packet_set_encryption_key is called.
160: */
1.2 provos 161: void
162: packet_set_connection(int fd_in, int fd_out)
1.1 deraadt 163: {
1.37 markus 164: Cipher *none = cipher_by_name("none");
165: if (none == NULL)
166: fatal("packet_set_connection: cannot load cipher 'none'");
1.14 markus 167: connection_in = fd_in;
168: connection_out = fd_out;
169: cipher_type = SSH_CIPHER_NONE;
1.40 ! markus 170: cipher_init(&send_context, none, (u_char *) "", 0, NULL, 0);
! 171: cipher_init(&receive_context, none, (u_char *) "", 0, NULL, 0);
1.14 markus 172: if (!initialized) {
173: initialized = 1;
174: buffer_init(&input);
175: buffer_init(&output);
176: buffer_init(&outgoing_packet);
177: buffer_init(&incoming_packet);
178: }
179: /* Kludge: arrange the close function to be called from fatal(). */
180: fatal_add_cleanup((void (*) (void *)) packet_close, NULL);
1.1 deraadt 181: }
182:
1.19 markus 183: /* Returns 1 if remote host is connected via socket, 0 if not. */
184:
185: int
186: packet_connection_is_on_socket()
187: {
188: struct sockaddr_storage from, to;
189: socklen_t fromlen, tolen;
190:
191: /* filedescriptors in and out are the same, so it's a socket */
192: if (connection_in == connection_out)
193: return 1;
194: fromlen = sizeof(from);
195: memset(&from, 0, sizeof(from));
1.20 markus 196: if (getpeername(connection_in, (struct sockaddr *)&from, &fromlen) < 0)
1.19 markus 197: return 0;
198: tolen = sizeof(to);
199: memset(&to, 0, sizeof(to));
1.20 markus 200: if (getpeername(connection_out, (struct sockaddr *)&to, &tolen) < 0)
1.19 markus 201: return 0;
202: if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
203: return 0;
204: if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
205: return 0;
206: return 1;
207: }
208:
209: /* returns 1 if connection is via ipv4 */
210:
211: int
212: packet_connection_is_ipv4()
213: {
214: struct sockaddr_storage to;
1.21 deraadt 215: socklen_t tolen = sizeof(to);
1.19 markus 216:
217: memset(&to, 0, sizeof(to));
218: if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
219: return 0;
220: if (to.ss_family != AF_INET)
221: return 0;
222: return 1;
223: }
224:
1.1 deraadt 225: /* Sets the connection into non-blocking mode. */
226:
1.2 provos 227: void
228: packet_set_nonblocking()
1.1 deraadt 229: {
1.14 markus 230: /* Set the socket into non-blocking mode. */
231: if (fcntl(connection_in, F_SETFL, O_NONBLOCK) < 0)
232: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
233:
234: if (connection_out != connection_in) {
235: if (fcntl(connection_out, F_SETFL, O_NONBLOCK) < 0)
236: error("fcntl O_NONBLOCK: %.100s", strerror(errno));
237: }
1.1 deraadt 238: }
239:
240: /* Returns the socket used for reading. */
241:
1.2 provos 242: int
243: packet_get_connection_in()
1.1 deraadt 244: {
1.14 markus 245: return connection_in;
1.1 deraadt 246: }
247:
248: /* Returns the descriptor used for writing. */
249:
1.2 provos 250: int
251: packet_get_connection_out()
1.1 deraadt 252: {
1.14 markus 253: return connection_out;
1.1 deraadt 254: }
255:
256: /* Closes the connection and clears and frees internal data structures. */
257:
1.2 provos 258: void
259: packet_close()
1.1 deraadt 260: {
1.14 markus 261: if (!initialized)
262: return;
263: initialized = 0;
264: if (connection_in == connection_out) {
265: shutdown(connection_out, SHUT_RDWR);
266: close(connection_out);
267: } else {
268: close(connection_in);
269: close(connection_out);
270: }
271: buffer_free(&input);
272: buffer_free(&output);
273: buffer_free(&outgoing_packet);
274: buffer_free(&incoming_packet);
275: if (packet_compression) {
276: buffer_free(&compression_buffer);
277: buffer_compress_uninit();
278: }
1.1 deraadt 279: }
280:
281: /* Sets remote side protocol flags. */
282:
1.2 provos 283: void
1.40 ! markus 284: packet_set_protocol_flags(u_int protocol_flags)
1.1 deraadt 285: {
1.14 markus 286: remote_protocol_flags = protocol_flags;
287: channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0);
1.1 deraadt 288: }
289:
290: /* Returns the remote protocol flags set earlier by the above function. */
291:
1.40 ! markus 292: u_int
1.2 provos 293: packet_get_protocol_flags()
1.1 deraadt 294: {
1.14 markus 295: return remote_protocol_flags;
1.1 deraadt 296: }
297:
1.16 markus 298: /*
299: * Starts packet compression from the next packet on in both directions.
300: * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
301: */
1.1 deraadt 302:
1.25 markus 303: /*** XXXXX todo: kex means re-init */
1.2 provos 304: void
305: packet_start_compression(int level)
1.1 deraadt 306: {
1.14 markus 307: if (packet_compression)
308: fatal("Compression already enabled.");
309: packet_compression = 1;
310: buffer_init(&compression_buffer);
311: buffer_compress_init(level);
1.1 deraadt 312: }
313:
1.16 markus 314: /*
315: * Encrypts the given number of bytes, copying from src to dest. bytes is
316: * known to be a multiple of 8.
317: */
1.1 deraadt 318:
1.2 provos 319: void
1.14 markus 320: packet_encrypt(CipherContext * cc, void *dest, void *src,
1.40 ! markus 321: u_int bytes)
1.1 deraadt 322: {
1.14 markus 323: cipher_encrypt(cc, dest, src, bytes);
1.1 deraadt 324: }
325:
1.16 markus 326: /*
327: * Decrypts the given number of bytes, copying from src to dest. bytes is
328: * known to be a multiple of 8.
329: */
1.1 deraadt 330:
1.2 provos 331: void
1.40 ! markus 332: packet_decrypt(CipherContext *context, void *dest, void *src, u_int bytes)
1.1 deraadt 333: {
1.16 markus 334: /*
335: * Cryptographic attack detector for ssh - Modifications for packet.c
336: * (C)1998 CORE-SDI, Buenos Aires Argentina Ariel Futoransky(futo@core-sdi.com)
337: */
1.37 markus 338: if (!compat20 &&
339: context->cipher->number != SSH_CIPHER_NONE &&
340: detect_attack(src, bytes, NULL) == DEATTACK_DETECTED)
1.14 markus 341: packet_disconnect("crc32 compensation attack: network attack detected");
342:
1.37 markus 343: cipher_decrypt(context, dest, src, bytes);
1.1 deraadt 344: }
345:
1.16 markus 346: /*
347: * Causes any further packets to be encrypted using the given key. The same
348: * key is used for both sending and reception. However, both directions are
349: * encrypted independently of each other.
350: */
1.1 deraadt 351:
1.2 provos 352: void
1.40 ! markus 353: packet_set_encryption_key(const u_char *key, u_int keylen,
1.37 markus 354: int number)
1.1 deraadt 355: {
1.37 markus 356: Cipher *cipher = cipher_by_number(number);
357: if (cipher == NULL)
358: fatal("packet_set_encryption_key: unknown cipher number %d", number);
1.25 markus 359: if (keylen < 20)
1.37 markus 360: fatal("packet_set_encryption_key: keylen too small: %d", keylen);
361: cipher_init(&receive_context, cipher, key, keylen, NULL, 0);
362: cipher_init(&send_context, cipher, key, keylen, NULL, 0);
1.1 deraadt 363: }
364:
365: /* Starts constructing a packet to send. */
366:
1.2 provos 367: void
1.25 markus 368: packet_start1(int type)
1.1 deraadt 369: {
1.14 markus 370: char buf[9];
1.1 deraadt 371:
1.14 markus 372: buffer_clear(&outgoing_packet);
373: memset(buf, 0, 8);
374: buf[8] = type;
375: buffer_append(&outgoing_packet, buf, 9);
1.1 deraadt 376: }
377:
1.25 markus 378: void
379: packet_start2(int type)
380: {
381: char buf[4+1+1];
382:
383: buffer_clear(&outgoing_packet);
384: memset(buf, 0, sizeof buf);
385: /* buf[0..3] = payload_len; */
386: /* buf[4] = pad_len; */
387: buf[5] = type & 0xff;
388: buffer_append(&outgoing_packet, buf, sizeof buf);
389: }
390:
391: void
392: packet_start(int type)
393: {
394: DBG(debug("packet_start[%d]",type));
395: if (use_ssh2_packet_format)
396: packet_start2(type);
397: else
398: packet_start1(type);
399: }
400:
1.1 deraadt 401: /* Appends a character to the packet data. */
402:
1.2 provos 403: void
404: packet_put_char(int value)
1.1 deraadt 405: {
1.14 markus 406: char ch = value;
407: buffer_append(&outgoing_packet, &ch, 1);
1.1 deraadt 408: }
409:
410: /* Appends an integer to the packet data. */
411:
1.2 provos 412: void
1.40 ! markus 413: packet_put_int(u_int value)
1.1 deraadt 414: {
1.14 markus 415: buffer_put_int(&outgoing_packet, value);
1.1 deraadt 416: }
417:
418: /* Appends a string to packet data. */
419:
1.2 provos 420: void
1.40 ! markus 421: packet_put_string(const char *buf, u_int len)
1.1 deraadt 422: {
1.14 markus 423: buffer_put_string(&outgoing_packet, buf, len);
1.1 deraadt 424: }
1.24 markus 425: void
426: packet_put_cstring(const char *str)
427: {
428: buffer_put_string(&outgoing_packet, str, strlen(str));
429: }
430:
431: void
1.40 ! markus 432: packet_put_raw(const char *buf, u_int len)
1.24 markus 433: {
434: buffer_append(&outgoing_packet, buf, len);
435: }
436:
1.1 deraadt 437:
438: /* Appends an arbitrary precision integer to packet data. */
439:
1.2 provos 440: void
1.14 markus 441: packet_put_bignum(BIGNUM * value)
1.1 deraadt 442: {
1.14 markus 443: buffer_put_bignum(&outgoing_packet, value);
1.1 deraadt 444: }
1.24 markus 445: void
446: packet_put_bignum2(BIGNUM * value)
447: {
448: buffer_put_bignum2(&outgoing_packet, value);
449: }
1.1 deraadt 450:
1.16 markus 451: /*
452: * Finalizes and sends the packet. If the encryption key has been set,
453: * encrypts the packet before sending.
454: */
1.14 markus 455:
1.2 provos 456: void
1.25 markus 457: packet_send1()
1.1 deraadt 458: {
1.14 markus 459: char buf[8], *cp;
460: int i, padding, len;
1.40 ! markus 461: u_int checksum;
1.14 markus 462: u_int32_t rand = 0;
463:
1.16 markus 464: /*
465: * If using packet compression, compress the payload of the outgoing
466: * packet.
467: */
1.14 markus 468: if (packet_compression) {
469: buffer_clear(&compression_buffer);
470: /* Skip padding. */
471: buffer_consume(&outgoing_packet, 8);
472: /* padding */
473: buffer_append(&compression_buffer, "\0\0\0\0\0\0\0\0", 8);
474: buffer_compress(&outgoing_packet, &compression_buffer);
475: buffer_clear(&outgoing_packet);
476: buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
477: buffer_len(&compression_buffer));
478: }
479: /* Compute packet length without padding (add checksum, remove padding). */
480: len = buffer_len(&outgoing_packet) + 4 - 8;
481:
1.32 markus 482: /* Insert padding. Initialized to zero in packet_start1() */
1.14 markus 483: padding = 8 - len % 8;
484: if (cipher_type != SSH_CIPHER_NONE) {
485: cp = buffer_ptr(&outgoing_packet);
486: for (i = 0; i < padding; i++) {
487: if (i % 4 == 0)
488: rand = arc4random();
489: cp[7 - i] = rand & 0xff;
490: rand >>= 8;
491: }
492: }
493: buffer_consume(&outgoing_packet, 8 - padding);
494:
495: /* Add check bytes. */
1.40 ! markus 496: checksum = ssh_crc32((u_char *) buffer_ptr(&outgoing_packet),
1.34 deraadt 497: buffer_len(&outgoing_packet));
1.14 markus 498: PUT_32BIT(buf, checksum);
499: buffer_append(&outgoing_packet, buf, 4);
1.1 deraadt 500:
501: #ifdef PACKET_DEBUG
1.14 markus 502: fprintf(stderr, "packet_send plain: ");
503: buffer_dump(&outgoing_packet);
1.1 deraadt 504: #endif
505:
1.14 markus 506: /* Append to output. */
507: PUT_32BIT(buf, len);
508: buffer_append(&output, buf, 4);
509: buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
510: packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
511: buffer_len(&outgoing_packet));
512:
1.1 deraadt 513: #ifdef PACKET_DEBUG
1.14 markus 514: fprintf(stderr, "encrypted: ");
515: buffer_dump(&output);
1.1 deraadt 516: #endif
517:
1.14 markus 518: buffer_clear(&outgoing_packet);
1.1 deraadt 519:
1.16 markus 520: /*
521: * Note that the packet is now only buffered in output. It won\'t be
522: * actually sent until packet_write_wait or packet_write_poll is
523: * called.
524: */
1.1 deraadt 525: }
526:
1.16 markus 527: /*
1.25 markus 528: * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
529: */
530: void
531: packet_send2()
532: {
1.40 ! markus 533: u_char *macbuf = NULL;
1.25 markus 534: char *cp;
1.40 ! markus 535: u_int packet_length = 0;
! 536: u_int i, padlen, len;
1.25 markus 537: u_int32_t rand = 0;
1.40 ! markus 538: static u_int seqnr = 0;
1.25 markus 539: int type;
540: Enc *enc = NULL;
541: Mac *mac = NULL;
542: Comp *comp = NULL;
543: int block_size;
544:
545: if (kex != NULL) {
546: enc = &kex->enc[MODE_OUT];
547: mac = &kex->mac[MODE_OUT];
548: comp = &kex->comp[MODE_OUT];
549: }
1.37 markus 550: block_size = enc ? enc->cipher->block_size : 8;
1.25 markus 551:
552: cp = buffer_ptr(&outgoing_packet);
553: type = cp[5] & 0xff;
554:
555: #ifdef PACKET_DEBUG
556: fprintf(stderr, "plain: ");
557: buffer_dump(&outgoing_packet);
558: #endif
559:
560: if (comp && comp->enabled) {
561: len = buffer_len(&outgoing_packet);
562: /* skip header, compress only payload */
563: buffer_consume(&outgoing_packet, 5);
564: buffer_clear(&compression_buffer);
565: buffer_compress(&outgoing_packet, &compression_buffer);
566: buffer_clear(&outgoing_packet);
567: buffer_append(&outgoing_packet, "\0\0\0\0\0", 5);
568: buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
569: buffer_len(&compression_buffer));
570: DBG(debug("compression: raw %d compressed %d", len,
571: buffer_len(&outgoing_packet)));
572: }
573:
574: /* sizeof (packet_len + pad_len + payload) */
575: len = buffer_len(&outgoing_packet);
576:
577: /*
578: * calc size of padding, alloc space, get random data,
579: * minimum padding is 4 bytes
580: */
581: padlen = block_size - (len % block_size);
582: if (padlen < 4)
583: padlen += block_size;
584: buffer_append_space(&outgoing_packet, &cp, padlen);
1.38 markus 585: if (enc && enc->cipher->number != SSH_CIPHER_NONE) {
1.32 markus 586: /* random padding */
1.25 markus 587: for (i = 0; i < padlen; i++) {
588: if (i % 4 == 0)
589: rand = arc4random();
590: cp[i] = rand & 0xff;
591: rand <<= 8;
592: }
1.32 markus 593: } else {
594: /* clear padding */
595: memset(cp, 0, padlen);
1.25 markus 596: }
597: /* packet_length includes payload, padding and padding length field */
598: packet_length = buffer_len(&outgoing_packet) - 4;
599: cp = buffer_ptr(&outgoing_packet);
600: PUT_32BIT(cp, packet_length);
601: cp[4] = padlen & 0xff;
602: DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
603:
604: /* compute MAC over seqnr and packet(length fields, payload, padding) */
605: if (mac && mac->enabled) {
606: macbuf = hmac( mac->md, seqnr,
1.40 ! markus 607: (u_char *) buffer_ptr(&outgoing_packet),
1.25 markus 608: buffer_len(&outgoing_packet),
609: mac->key, mac->key_len
610: );
1.36 markus 611: DBG(debug("done calc MAC out #%d", seqnr));
1.25 markus 612: }
613: /* encrypt packet and append to output buffer. */
614: buffer_append_space(&output, &cp, buffer_len(&outgoing_packet));
615: packet_encrypt(&send_context, cp, buffer_ptr(&outgoing_packet),
616: buffer_len(&outgoing_packet));
617: /* append unencrypted MAC */
618: if (mac && mac->enabled)
619: buffer_append(&output, (char *)macbuf, mac->mac_len);
620: #ifdef PACKET_DEBUG
621: fprintf(stderr, "encrypted: ");
622: buffer_dump(&output);
623: #endif
1.29 markus 624: /* increment sequence number for outgoing packets */
625: if (++seqnr == 0)
626: log("outgoing seqnr wraps around");
1.25 markus 627: buffer_clear(&outgoing_packet);
628:
629: if (type == SSH2_MSG_NEWKEYS) {
630: if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
631: fatal("packet_send2: no KEX");
632: if (mac->md != NULL)
633: mac->enabled = 1;
1.37 markus 634: DBG(debug("cipher_init send_context"));
635: cipher_init(&send_context, enc->cipher,
636: enc->key, enc->cipher->key_len,
637: enc->iv, enc->cipher->block_size);
1.25 markus 638: clear_enc_keys(enc, kex->we_need);
639: if (comp->type != 0 && comp->enabled == 0) {
640: comp->enabled = 1;
641: if (! packet_compression)
642: packet_start_compression(6);
643: }
644: }
645: }
646:
647: void
648: packet_send()
649: {
650: if (use_ssh2_packet_format)
651: packet_send2();
652: else
653: packet_send1();
654: DBG(debug("packet_send done"));
655: }
656:
657: /*
1.16 markus 658: * Waits until a packet has been received, and returns its type. Note that
659: * no other data is processed until this returns, so this function should not
660: * be used during the interactive session.
661: */
1.1 deraadt 662:
1.2 provos 663: int
664: packet_read(int *payload_len_ptr)
1.1 deraadt 665: {
1.14 markus 666: int type, len;
667: fd_set set;
668: char buf[8192];
1.25 markus 669: DBG(debug("packet_read()"));
1.14 markus 670:
671: /* Since we are blocking, ensure that all written packets have been sent. */
672: packet_write_wait();
673:
674: /* Stay in the loop until we have received a complete packet. */
675: for (;;) {
676: /* Try to read a packet from the buffer. */
677: type = packet_read_poll(payload_len_ptr);
1.32 markus 678: if (!use_ssh2_packet_format && (
679: type == SSH_SMSG_SUCCESS
1.14 markus 680: || type == SSH_SMSG_FAILURE
681: || type == SSH_CMSG_EOF
1.32 markus 682: || type == SSH_CMSG_EXIT_CONFIRMATION))
1.14 markus 683: packet_integrity_check(*payload_len_ptr, 0, type);
684: /* If we got a packet, return it. */
685: if (type != SSH_MSG_NONE)
686: return type;
1.16 markus 687: /*
688: * Otherwise, wait for some data to arrive, add it to the
689: * buffer, and try again.
690: */
1.14 markus 691: FD_ZERO(&set);
692: FD_SET(connection_in, &set);
1.16 markus 693:
1.14 markus 694: /* Wait for some data to arrive. */
695: select(connection_in + 1, &set, NULL, NULL, NULL);
1.16 markus 696:
1.14 markus 697: /* Read data from the socket. */
698: len = read(connection_in, buf, sizeof(buf));
1.18 markus 699: if (len == 0) {
700: log("Connection closed by %.200s", get_remote_ipaddr());
701: fatal_cleanup();
702: }
1.14 markus 703: if (len < 0)
704: fatal("Read from socket failed: %.100s", strerror(errno));
705: /* Append it to the buffer. */
706: packet_process_incoming(buf, len);
707: }
708: /* NOTREACHED */
1.1 deraadt 709: }
710:
1.16 markus 711: /*
712: * Waits until a packet has been received, verifies that its type matches
713: * that given, and gives a fatal error and exits if there is a mismatch.
714: */
1.1 deraadt 715:
1.2 provos 716: void
717: packet_read_expect(int *payload_len_ptr, int expected_type)
1.1 deraadt 718: {
1.14 markus 719: int type;
1.1 deraadt 720:
1.14 markus 721: type = packet_read(payload_len_ptr);
722: if (type != expected_type)
723: packet_disconnect("Protocol error: expected packet type %d, got %d",
1.25 markus 724: expected_type, type);
1.1 deraadt 725: }
726:
727: /* Checks if a full packet is available in the data received so far via
1.14 markus 728: * packet_process_incoming. If so, reads the packet; otherwise returns
729: * SSH_MSG_NONE. This does not wait for data from the connection.
730: *
731: * SSH_MSG_DISCONNECT is handled specially here. Also,
732: * SSH_MSG_IGNORE messages are skipped by this function and are never returned
733: * to higher levels.
734: *
735: * The returned payload_len does include space consumed by:
736: * Packet length
737: * Padding
738: * Packet type
739: * Check bytes
740: */
1.1 deraadt 741:
1.2 provos 742: int
1.25 markus 743: packet_read_poll1(int *payload_len_ptr)
1.1 deraadt 744: {
1.40 ! markus 745: u_int len, padded_len;
! 746: u_char *ucp;
1.25 markus 747: char buf[8], *cp;
1.40 ! markus 748: u_int checksum, stored_checksum;
1.14 markus 749:
750: /* Check if input size is less than minimum packet size. */
751: if (buffer_len(&input) < 4 + 8)
752: return SSH_MSG_NONE;
753: /* Get length of incoming packet. */
1.40 ! markus 754: ucp = (u_char *) buffer_ptr(&input);
1.14 markus 755: len = GET_32BIT(ucp);
756: if (len < 1 + 2 + 2 || len > 256 * 1024)
757: packet_disconnect("Bad packet length %d.", len);
758: padded_len = (len + 8) & ~7;
759:
760: /* Check if the packet has been entirely received. */
761: if (buffer_len(&input) < 4 + padded_len)
762: return SSH_MSG_NONE;
763:
764: /* The entire packet is in buffer. */
765:
766: /* Consume packet length. */
767: buffer_consume(&input, 4);
768:
769: /* Copy data to incoming_packet. */
770: buffer_clear(&incoming_packet);
771: buffer_append_space(&incoming_packet, &cp, padded_len);
772: packet_decrypt(&receive_context, cp, buffer_ptr(&input), padded_len);
773: buffer_consume(&input, padded_len);
1.1 deraadt 774:
775: #ifdef PACKET_DEBUG
1.14 markus 776: fprintf(stderr, "read_poll plain: ");
777: buffer_dump(&incoming_packet);
1.1 deraadt 778: #endif
779:
1.14 markus 780: /* Compute packet checksum. */
1.40 ! markus 781: checksum = ssh_crc32((u_char *) buffer_ptr(&incoming_packet),
1.25 markus 782: buffer_len(&incoming_packet) - 4);
1.14 markus 783:
784: /* Skip padding. */
785: buffer_consume(&incoming_packet, 8 - len % 8);
786:
787: /* Test check bytes. */
788:
789: if (len != buffer_len(&incoming_packet))
790: packet_disconnect("packet_read_poll: len %d != buffer_len %d.",
1.25 markus 791: len, buffer_len(&incoming_packet));
1.14 markus 792:
1.40 ! markus 793: ucp = (u_char *) buffer_ptr(&incoming_packet) + len - 4;
1.14 markus 794: stored_checksum = GET_32BIT(ucp);
795: if (checksum != stored_checksum)
796: packet_disconnect("Corrupted check bytes on input.");
797: buffer_consume_end(&incoming_packet, 4);
798:
799: /* If using packet compression, decompress the packet. */
800: if (packet_compression) {
801: buffer_clear(&compression_buffer);
802: buffer_uncompress(&incoming_packet, &compression_buffer);
803: buffer_clear(&incoming_packet);
804: buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
1.25 markus 805: buffer_len(&compression_buffer));
1.14 markus 806: }
807: /* Get packet type. */
808: buffer_get(&incoming_packet, &buf[0], 1);
809:
810: /* Return length of payload (without type field). */
811: *payload_len_ptr = buffer_len(&incoming_packet);
812:
813: /* Return type. */
1.40 ! markus 814: return (u_char) buf[0];
1.1 deraadt 815: }
1.14 markus 816:
1.25 markus 817: int
818: packet_read_poll2(int *payload_len_ptr)
819: {
1.40 ! markus 820: u_int padlen, need;
! 821: u_char buf[8], *macbuf;
! 822: u_char *ucp;
1.25 markus 823: char *cp;
1.40 ! markus 824: static u_int packet_length = 0;
! 825: static u_int seqnr = 0;
1.25 markus 826: int type;
827: int maclen, block_size;
828: Enc *enc = NULL;
829: Mac *mac = NULL;
830: Comp *comp = NULL;
831:
832: if (kex != NULL) {
833: enc = &kex->enc[MODE_IN];
834: mac = &kex->mac[MODE_IN];
835: comp = &kex->comp[MODE_IN];
836: }
837: maclen = mac && mac->enabled ? mac->mac_len : 0;
1.37 markus 838: block_size = enc ? enc->cipher->block_size : 8;
1.25 markus 839:
840: if (packet_length == 0) {
841: /*
842: * check if input size is less than the cipher block size,
843: * decrypt first block and extract length of incoming packet
844: */
845: if (buffer_len(&input) < block_size)
846: return SSH_MSG_NONE;
847: buffer_clear(&incoming_packet);
848: buffer_append_space(&incoming_packet, &cp, block_size);
849: packet_decrypt(&receive_context, cp, buffer_ptr(&input),
850: block_size);
1.40 ! markus 851: ucp = (u_char *) buffer_ptr(&incoming_packet);
1.25 markus 852: packet_length = GET_32BIT(ucp);
853: if (packet_length < 1 + 4 || packet_length > 256 * 1024) {
854: buffer_dump(&incoming_packet);
855: packet_disconnect("Bad packet length %d.", packet_length);
856: }
857: DBG(debug("input: packet len %d", packet_length+4));
858: buffer_consume(&input, block_size);
859: }
860: /* we have a partial packet of block_size bytes */
861: need = 4 + packet_length - block_size;
862: DBG(debug("partial packet %d, need %d, maclen %d", block_size,
863: need, maclen));
864: if (need % block_size != 0)
865: fatal("padding error: need %d block %d mod %d",
866: need, block_size, need % block_size);
867: /*
868: * check if the entire packet has been received and
869: * decrypt into incoming_packet
870: */
871: if (buffer_len(&input) < need + maclen)
872: return SSH_MSG_NONE;
873: #ifdef PACKET_DEBUG
874: fprintf(stderr, "read_poll enc/full: ");
875: buffer_dump(&input);
876: #endif
877: buffer_append_space(&incoming_packet, &cp, need);
878: packet_decrypt(&receive_context, cp, buffer_ptr(&input), need);
879: buffer_consume(&input, need);
880: /*
881: * compute MAC over seqnr and packet,
882: * increment sequence number for incoming packet
883: */
1.29 markus 884: if (mac && mac->enabled) {
1.25 markus 885: macbuf = hmac( mac->md, seqnr,
1.40 ! markus 886: (u_char *) buffer_ptr(&incoming_packet),
1.25 markus 887: buffer_len(&incoming_packet),
888: mac->key, mac->key_len
889: );
890: if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0)
1.36 markus 891: packet_disconnect("Corrupted MAC on input.");
892: DBG(debug("MAC #%d ok", seqnr));
1.25 markus 893: buffer_consume(&input, mac->mac_len);
894: }
1.29 markus 895: if (++seqnr == 0)
896: log("incoming seqnr wraps around");
1.25 markus 897:
898: /* get padlen */
899: cp = buffer_ptr(&incoming_packet) + 4;
900: padlen = *cp & 0xff;
901: DBG(debug("input: padlen %d", padlen));
902: if (padlen < 4)
903: packet_disconnect("Corrupted padlen %d on input.", padlen);
904:
905: /* skip packet size + padlen, discard padding */
906: buffer_consume(&incoming_packet, 4 + 1);
907: buffer_consume_end(&incoming_packet, padlen);
908:
909: DBG(debug("input: len before de-compress %d", buffer_len(&incoming_packet)));
910: if (comp && comp->enabled) {
911: buffer_clear(&compression_buffer);
912: buffer_uncompress(&incoming_packet, &compression_buffer);
913: buffer_clear(&incoming_packet);
914: buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
915: buffer_len(&compression_buffer));
916: DBG(debug("input: len after de-compress %d", buffer_len(&incoming_packet)));
917: }
918: /*
919: * get packet type, implies consume.
920: * return length of payload (without type field)
921: */
922: buffer_get(&incoming_packet, (char *)&buf[0], 1);
923: *payload_len_ptr = buffer_len(&incoming_packet);
924:
925: /* reset for next packet */
926: packet_length = 0;
927:
928: /* extract packet type */
1.40 ! markus 929: type = (u_char)buf[0];
1.25 markus 930:
931: if (type == SSH2_MSG_NEWKEYS) {
932: if (kex==NULL || mac==NULL || enc==NULL || comp==NULL)
933: fatal("packet_read_poll2: no KEX");
934: if (mac->md != NULL)
935: mac->enabled = 1;
1.37 markus 936: DBG(debug("cipher_init receive_context"));
937: cipher_init(&receive_context, enc->cipher,
938: enc->key, enc->cipher->key_len,
939: enc->iv, enc->cipher->block_size);
1.25 markus 940: clear_enc_keys(enc, kex->we_need);
941: if (comp->type != 0 && comp->enabled == 0) {
942: comp->enabled = 1;
943: if (! packet_compression)
944: packet_start_compression(6);
945: }
946: }
947:
948: #ifdef PACKET_DEBUG
949: fprintf(stderr, "read/plain[%d]:\r\n",type);
950: buffer_dump(&incoming_packet);
951: #endif
1.40 ! markus 952: return (u_char)type;
1.25 markus 953: }
954:
955: int
956: packet_read_poll(int *payload_len_ptr)
957: {
958: char *msg;
959: for (;;) {
960: int type = use_ssh2_packet_format ?
961: packet_read_poll2(payload_len_ptr):
962: packet_read_poll1(payload_len_ptr);
963:
964: if(compat20) {
965: int reason;
966: if (type != 0)
967: DBG(debug("received packet type %d", type));
968: switch(type) {
969: case SSH2_MSG_IGNORE:
970: break;
971: case SSH2_MSG_DEBUG:
972: packet_get_char();
973: msg = packet_get_string(NULL);
974: debug("Remote: %.900s", msg);
975: xfree(msg);
976: msg = packet_get_string(NULL);
977: xfree(msg);
978: break;
979: case SSH2_MSG_DISCONNECT:
980: reason = packet_get_int();
981: msg = packet_get_string(NULL);
982: log("Received disconnect: %d: %.900s", reason, msg);
983: xfree(msg);
984: fatal_cleanup();
985: break;
986: default:
987: return type;
988: break;
989: }
990: } else {
991: switch(type) {
992: case SSH_MSG_IGNORE:
993: break;
994: case SSH_MSG_DEBUG:
995: msg = packet_get_string(NULL);
996: debug("Remote: %.900s", msg);
997: xfree(msg);
998: break;
999: case SSH_MSG_DISCONNECT:
1000: msg = packet_get_string(NULL);
1001: log("Received disconnect: %.900s", msg);
1002: fatal_cleanup();
1003: xfree(msg);
1004: break;
1005: default:
1006: if (type != 0)
1007: DBG(debug("received packet type %d", type));
1008: return type;
1009: break;
1010: }
1011: }
1012: }
1013: }
1014:
1.16 markus 1015: /*
1016: * Buffers the given amount of input characters. This is intended to be used
1017: * together with packet_read_poll.
1018: */
1.1 deraadt 1019:
1.2 provos 1020: void
1.40 ! markus 1021: packet_process_incoming(const char *buf, u_int len)
1.1 deraadt 1022: {
1.14 markus 1023: buffer_append(&input, buf, len);
1.1 deraadt 1024: }
1025:
1026: /* Returns a character from the packet. */
1027:
1.40 ! markus 1028: u_int
1.2 provos 1029: packet_get_char()
1.1 deraadt 1030: {
1.14 markus 1031: char ch;
1032: buffer_get(&incoming_packet, &ch, 1);
1.40 ! markus 1033: return (u_char) ch;
1.1 deraadt 1034: }
1035:
1036: /* Returns an integer from the packet data. */
1037:
1.40 ! markus 1038: u_int
1.2 provos 1039: packet_get_int()
1.1 deraadt 1040: {
1.14 markus 1041: return buffer_get_int(&incoming_packet);
1.1 deraadt 1042: }
1043:
1.16 markus 1044: /*
1045: * Returns an arbitrary precision integer from the packet data. The integer
1046: * must have been initialized before this call.
1047: */
1.1 deraadt 1048:
1.2 provos 1049: void
1.14 markus 1050: packet_get_bignum(BIGNUM * value, int *length_ptr)
1.1 deraadt 1051: {
1.14 markus 1052: *length_ptr = buffer_get_bignum(&incoming_packet, value);
1.24 markus 1053: }
1054:
1055: void
1056: packet_get_bignum2(BIGNUM * value, int *length_ptr)
1057: {
1058: *length_ptr = buffer_get_bignum2(&incoming_packet, value);
1059: }
1060:
1061: char *
1062: packet_get_raw(int *length_ptr)
1063: {
1064: int bytes = buffer_len(&incoming_packet);
1065: if (length_ptr != NULL)
1066: *length_ptr = bytes;
1067: return buffer_ptr(&incoming_packet);
1.28 markus 1068: }
1069:
1070: int
1071: packet_remaining(void)
1072: {
1073: return buffer_len(&incoming_packet);
1.1 deraadt 1074: }
1075:
1.16 markus 1076: /*
1077: * Returns a string from the packet data. The string is allocated using
1078: * xmalloc; it is the responsibility of the calling program to free it when
1079: * no longer needed. The length_ptr argument may be NULL, or point to an
1080: * integer into which the length of the string is stored.
1081: */
1.1 deraadt 1082:
1.16 markus 1083: char *
1.40 ! markus 1084: packet_get_string(u_int *length_ptr)
1.1 deraadt 1085: {
1.14 markus 1086: return buffer_get_string(&incoming_packet, length_ptr);
1.1 deraadt 1087: }
1088:
1.16 markus 1089: /*
1090: * Sends a diagnostic message from the server to the client. This message
1091: * can be sent at any time (but not while constructing another message). The
1092: * message is printed immediately, but only if the client is being executed
1093: * in verbose mode. These messages are primarily intended to ease debugging
1094: * authentication problems. The length of the formatted message must not
1095: * exceed 1024 bytes. This will automatically call packet_write_wait.
1096: */
1.1 deraadt 1097:
1.2 provos 1098: void
1.14 markus 1099: packet_send_debug(const char *fmt,...)
1.1 deraadt 1100: {
1.14 markus 1101: char buf[1024];
1102: va_list args;
1.39 markus 1103:
1104: if (compat20 && (datafellows & SSH_BUG_DEBUG))
1105: return;
1.14 markus 1106:
1107: va_start(args, fmt);
1108: vsnprintf(buf, sizeof(buf), fmt, args);
1109: va_end(args);
1110:
1.30 markus 1111: if (compat20) {
1112: packet_start(SSH2_MSG_DEBUG);
1113: packet_put_char(0); /* bool: always display */
1114: packet_put_cstring(buf);
1115: packet_put_cstring("");
1116: } else {
1117: packet_start(SSH_MSG_DEBUG);
1118: packet_put_cstring(buf);
1119: }
1.14 markus 1120: packet_send();
1121: packet_write_wait();
1.1 deraadt 1122: }
1123:
1.16 markus 1124: /*
1125: * Logs the error plus constructs and sends a disconnect packet, closes the
1126: * connection, and exits. This function never returns. The error message
1127: * should not contain a newline. The length of the formatted message must
1128: * not exceed 1024 bytes.
1129: */
1.1 deraadt 1130:
1.2 provos 1131: void
1.14 markus 1132: packet_disconnect(const char *fmt,...)
1.1 deraadt 1133: {
1.14 markus 1134: char buf[1024];
1135: va_list args;
1136: static int disconnecting = 0;
1137: if (disconnecting) /* Guard against recursive invocations. */
1138: fatal("packet_disconnect called recursively.");
1139: disconnecting = 1;
1140:
1.16 markus 1141: /*
1142: * Format the message. Note that the caller must make sure the
1143: * message is of limited size.
1144: */
1.14 markus 1145: va_start(args, fmt);
1146: vsnprintf(buf, sizeof(buf), fmt, args);
1147: va_end(args);
1148:
1149: /* Send the disconnect message to the other side, and wait for it to get sent. */
1.25 markus 1150: if (compat20) {
1151: packet_start(SSH2_MSG_DISCONNECT);
1152: packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
1153: packet_put_cstring(buf);
1154: packet_put_cstring("");
1155: } else {
1156: packet_start(SSH_MSG_DISCONNECT);
1157: packet_put_string(buf, strlen(buf));
1158: }
1.14 markus 1159: packet_send();
1160: packet_write_wait();
1161:
1162: /* Stop listening for connections. */
1163: channel_stop_listening();
1164:
1165: /* Close the connection. */
1166: packet_close();
1.1 deraadt 1167:
1.14 markus 1168: /* Display the error locally and exit. */
1.17 markus 1169: log("Disconnecting: %.100s", buf);
1170: fatal_cleanup();
1.1 deraadt 1171: }
1172:
1.16 markus 1173: /* Checks if there is any buffered output, and tries to write some of the output. */
1.1 deraadt 1174:
1.2 provos 1175: void
1176: packet_write_poll()
1.1 deraadt 1177: {
1.14 markus 1178: int len = buffer_len(&output);
1179: if (len > 0) {
1180: len = write(connection_out, buffer_ptr(&output), len);
1181: if (len <= 0) {
1182: if (errno == EAGAIN)
1183: return;
1184: else
1185: fatal("Write failed: %.100s", strerror(errno));
1186: }
1187: buffer_consume(&output, len);
1188: }
1.1 deraadt 1189: }
1190:
1.16 markus 1191: /*
1192: * Calls packet_write_poll repeatedly until all pending output data has been
1193: * written.
1194: */
1.1 deraadt 1195:
1.2 provos 1196: void
1197: packet_write_wait()
1.1 deraadt 1198: {
1.14 markus 1199: packet_write_poll();
1200: while (packet_have_data_to_write()) {
1201: fd_set set;
1202: FD_ZERO(&set);
1203: FD_SET(connection_out, &set);
1204: select(connection_out + 1, NULL, &set, NULL, NULL);
1205: packet_write_poll();
1206: }
1.1 deraadt 1207: }
1208:
1209: /* Returns true if there is buffered data to write to the connection. */
1210:
1.2 provos 1211: int
1212: packet_have_data_to_write()
1.1 deraadt 1213: {
1.14 markus 1214: return buffer_len(&output) != 0;
1.1 deraadt 1215: }
1216:
1217: /* Returns true if there is not too much data to write to the connection. */
1218:
1.2 provos 1219: int
1220: packet_not_very_much_data_to_write()
1.1 deraadt 1221: {
1.14 markus 1222: if (interactive_mode)
1223: return buffer_len(&output) < 16384;
1224: else
1225: return buffer_len(&output) < 128 * 1024;
1.1 deraadt 1226: }
1227:
1228: /* Informs that the current session is interactive. Sets IP flags for that. */
1229:
1.2 provos 1230: void
1231: packet_set_interactive(int interactive, int keepalives)
1.1 deraadt 1232: {
1.14 markus 1233: int on = 1;
1.1 deraadt 1234:
1.14 markus 1235: /* Record that we are in interactive mode. */
1236: interactive_mode = interactive;
1.1 deraadt 1237:
1.19 markus 1238: /* Only set socket options if using a socket. */
1239: if (!packet_connection_is_on_socket())
1.14 markus 1240: return;
1241: if (keepalives) {
1242: /* Set keepalives if requested. */
1243: if (setsockopt(connection_in, SOL_SOCKET, SO_KEEPALIVE, (void *) &on,
1.19 markus 1244: sizeof(on)) < 0)
1.14 markus 1245: error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
1246: }
1.19 markus 1247: /*
1248: * IPTOS_LOWDELAY, TCP_NODELAY and IPTOS_THROUGHPUT are IPv4 only
1249: */
1250: if (!packet_connection_is_ipv4())
1251: return;
1.14 markus 1252: if (interactive) {
1.16 markus 1253: /*
1254: * Set IP options for an interactive connection. Use
1255: * IPTOS_LOWDELAY and TCP_NODELAY.
1256: */
1.14 markus 1257: int lowdelay = IPTOS_LOWDELAY;
1258: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &lowdelay,
1.19 markus 1259: sizeof(lowdelay)) < 0)
1.14 markus 1260: error("setsockopt IPTOS_LOWDELAY: %.100s", strerror(errno));
1261: if (setsockopt(connection_in, IPPROTO_TCP, TCP_NODELAY, (void *) &on,
1.19 markus 1262: sizeof(on)) < 0)
1.14 markus 1263: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1264: } else {
1.16 markus 1265: /*
1266: * Set IP options for a non-interactive connection. Use
1267: * IPTOS_THROUGHPUT.
1268: */
1.14 markus 1269: int throughput = IPTOS_THROUGHPUT;
1270: if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, (void *) &throughput,
1.19 markus 1271: sizeof(throughput)) < 0)
1.14 markus 1272: error("setsockopt IPTOS_THROUGHPUT: %.100s", strerror(errno));
1273: }
1.1 deraadt 1274: }
1275:
1276: /* Returns true if the current connection is interactive. */
1277:
1.2 provos 1278: int
1279: packet_is_interactive()
1.1 deraadt 1280: {
1.14 markus 1281: return interactive_mode;
1.12 markus 1282: }
1283:
1284: int
1285: packet_set_maxsize(int s)
1286: {
1.14 markus 1287: static int called = 0;
1288: if (called) {
1.25 markus 1289: log("packet_set_maxsize: called twice: old %d new %d",
1290: max_packet_size, s);
1.14 markus 1291: return -1;
1292: }
1293: if (s < 4 * 1024 || s > 1024 * 1024) {
1294: log("packet_set_maxsize: bad size %d", s);
1295: return -1;
1296: }
1297: log("packet_set_maxsize: setting to %d", s);
1298: max_packet_size = s;
1299: return s;
1.1 deraadt 1300: }
![[BACK]](/icons/back.gif){kind=icon}
Return to packet.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh