1 /* $OpenBSD: roaming_common.c,v 1.13 2015/01/27 12:54:06 okan Exp $ */
3 * Copyright (c) 2004-2009 AppGate Network Security AB
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <sys/types.h>
21 #include <sys/socket.h>
38 static size_t out_buf_size = 0;
39 static char *out_buf = NULL;
40 static size_t out_start;
41 static size_t out_last;
43 static u_int64_t write_bytes = 0;
44 static u_int64_t read_bytes = 0;
46 int roaming_enabled = 0;
47 int resume_in_progress = 0;
50 get_snd_buf_size(void)
52 int fd = packet_get_connection_out();
54 socklen_t optvallen = sizeof(optval);
56 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
57 optval = DEFAULT_ROAMBUF;
62 get_recv_buf_size(void)
64 int fd = packet_get_connection_in();
66 socklen_t optvallen = sizeof(optval);
68 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
69 optval = DEFAULT_ROAMBUF;
74 set_out_buffer_size(size_t size)
76 if (size == 0 || size > MAX_ROAMBUF)
77 fatal("%s: bad buffer size %lu", __func__, (u_long)size);
79 * The buffer size can only be set once and the buffer will live
80 * as long as the session lives.
82 if (out_buf == NULL) {
84 out_buf = xmalloc(size);
97 add_recv_bytes(u_int64_t num)
109 roam_set_bytes(u_int64_t sent, u_int64_t recvd)
116 buf_append(const char *buf, size_t count)
118 if (count > out_buf_size) {
119 buf += count - out_buf_size;
120 count = out_buf_size;
122 if (count < out_buf_size - out_last) {
123 memcpy(out_buf + out_last, buf, count);
124 if (out_start > out_last)
129 size_t chunk = out_buf_size - out_last;
130 memcpy(out_buf + out_last, buf, chunk);
131 memcpy(out_buf, buf + chunk, count - chunk);
132 out_last = count - chunk;
133 out_start = out_last + 1;
138 roaming_write(int fd, const void *buf, size_t count, int *cont)
142 ret = write(fd, buf, count);
143 if (ret > 0 && !resume_in_progress) {
145 if (out_buf_size > 0)
146 buf_append(buf, ret);
148 if (out_buf_size > 0 &&
149 (ret == 0 || (ret == -1 && errno == EPIPE))) {
150 if (wait_for_roaming_reconnect() != 0) {
162 roaming_read(int fd, void *buf, size_t count, int *cont)
164 ssize_t ret = read(fd, buf, count);
166 if (!resume_in_progress) {
169 } else if (out_buf_size > 0 &&
170 (ret == 0 || (ret == -1 && (errno == ECONNRESET
171 || errno == ECONNABORTED || errno == ETIMEDOUT
172 || errno == EHOSTUNREACH)))) {
173 debug("roaming_read failed for %d ret=%ld errno=%d",
174 fd, (long)ret, errno);
176 if (wait_for_roaming_reconnect() == 0)
183 roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
186 size_t ret = atomicio(f, fd, buf, count);
188 if (f == vwrite && ret > 0 && !resume_in_progress) {
190 } else if (f == read && ret > 0 && !resume_in_progress) {
197 resend_bytes(int fd, u_int64_t *offset)
199 size_t available, needed;
201 if (out_start < out_last)
202 available = out_last - out_start;
204 available = out_buf_size;
205 needed = write_bytes - *offset;
206 debug3("resend_bytes: resend %lu bytes from %llu",
207 (unsigned long)needed, (unsigned long long)*offset);
208 if (needed > available)
209 fatal("Needed to resend more data than in the cache");
210 if (out_last < needed) {
211 int chunkend = needed - out_last;
212 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
214 atomicio(vwrite, fd, out_buf, out_last);
216 atomicio(vwrite, fd, out_buf + (out_last - needed), needed);
221 * Caclulate a new key after a reconnect
224 calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
226 u_char hash[SSH_DIGEST_MAX_LENGTH];
230 buffer_put_int64(&b, *key);
231 buffer_put_int64(&b, cookie);
232 buffer_put_int64(&b, challenge);
234 if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, hash, sizeof(hash)) != 0)
235 fatal("%s: digest_buffer failed", __func__);
238 buffer_append(&b, hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
239 *key = buffer_get_int64(&b);