1 /* $OpenBSD: roaming_common.c,v 1.9 2011/12/07 05:44:38 djm 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>
25 #ifdef HAVE_INTTYPES_H
40 static size_t out_buf_size = 0;
41 static char *out_buf = NULL;
42 static size_t out_start;
43 static size_t out_last;
45 static u_int64_t write_bytes = 0;
46 static u_int64_t read_bytes = 0;
48 int roaming_enabled = 0;
49 int resume_in_progress = 0;
54 int fd = packet_get_connection_out();
56 socklen_t optvallen = sizeof(optval);
58 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
59 optval = DEFAULT_ROAMBUF;
66 int fd = packet_get_connection_in();
68 socklen_t optvallen = sizeof(optval);
70 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
71 optval = DEFAULT_ROAMBUF;
76 set_out_buffer_size(size_t size)
78 if (size == 0 || size > MAX_ROAMBUF)
79 fatal("%s: bad buffer size %lu", __func__, (u_long)size);
81 * The buffer size can only be set once and the buffer will live
82 * as long as the session lives.
84 if (out_buf == NULL) {
86 out_buf = xmalloc(size);
99 add_recv_bytes(u_int64_t num)
111 roam_set_bytes(u_int64_t sent, u_int64_t recvd)
118 buf_append(const char *buf, size_t count)
120 if (count > out_buf_size) {
121 buf += count - out_buf_size;
122 count = out_buf_size;
124 if (count < out_buf_size - out_last) {
125 memcpy(out_buf + out_last, buf, count);
126 if (out_start > out_last)
131 size_t chunk = out_buf_size - out_last;
132 memcpy(out_buf + out_last, buf, chunk);
133 memcpy(out_buf, buf + chunk, count - chunk);
134 out_last = count - chunk;
135 out_start = out_last + 1;
140 roaming_write(int fd, const void *buf, size_t count, int *cont)
144 ret = write(fd, buf, count);
145 if (ret > 0 && !resume_in_progress) {
147 if (out_buf_size > 0)
148 buf_append(buf, ret);
150 if (out_buf_size > 0 &&
151 (ret == 0 || (ret == -1 && errno == EPIPE))) {
152 if (wait_for_roaming_reconnect() != 0) {
164 roaming_read(int fd, void *buf, size_t count, int *cont)
166 ssize_t ret = read(fd, buf, count);
168 if (!resume_in_progress) {
171 } else if (out_buf_size > 0 &&
172 (ret == 0 || (ret == -1 && (errno == ECONNRESET
173 || errno == ECONNABORTED || errno == ETIMEDOUT
174 || errno == EHOSTUNREACH)))) {
175 debug("roaming_read failed for %d ret=%ld errno=%d",
176 fd, (long)ret, errno);
178 if (wait_for_roaming_reconnect() == 0)
185 roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
188 size_t ret = atomicio(f, fd, buf, count);
190 if (f == vwrite && ret > 0 && !resume_in_progress) {
192 } else if (f == read && ret > 0 && !resume_in_progress) {
199 resend_bytes(int fd, u_int64_t *offset)
201 size_t available, needed;
203 if (out_start < out_last)
204 available = out_last - out_start;
206 available = out_buf_size;
207 needed = write_bytes - *offset;
208 debug3("resend_bytes: resend %lu bytes from %llu",
209 (unsigned long)needed, (unsigned long long)*offset);
210 if (needed > available)
211 fatal("Needed to resend more data than in the cache");
212 if (out_last < needed) {
213 int chunkend = needed - out_last;
214 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
216 atomicio(vwrite, fd, out_buf, out_last);
218 atomicio(vwrite, fd, out_buf + (out_last - needed), needed);
223 * Caclulate a new key after a reconnect
226 calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
228 const EVP_MD *md = EVP_sha1();
230 char hash[EVP_MAX_MD_SIZE];
234 buffer_put_int64(&b, *key);
235 buffer_put_int64(&b, cookie);
236 buffer_put_int64(&b, challenge);
238 EVP_DigestInit(&ctx, md);
239 EVP_DigestUpdate(&ctx, buffer_ptr(&b), buffer_len(&b));
240 EVP_DigestFinal(&ctx, hash, NULL);
243 buffer_append(&b, hash, EVP_MD_size(md));
244 *key = buffer_get_int64(&b);