roaming_common.c revision 197670 
1/* $OpenBSD: roaming_common.c,v 1.5 2009/06/27 09:32:43 andreas Exp $ */
2/*
3 * Copyright (c) 2004-2009 AppGate Network Security AB
4 *
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.
8 *
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.
16 */
17
18#include "includes.h"
19
20#include <sys/types.h>
21#include <sys/socket.h>
22#include <sys/uio.h>
23
24#include <errno.h>
25#ifdef HAVE_INTTYPES_H
26#include <inttypes.h>
27#endif
28#include <stdarg.h>
29#include <string.h>
30#include <unistd.h>
31
32#include "atomicio.h"
33#include "log.h"
34#include "packet.h"
35#include "xmalloc.h"
36#include "cipher.h"
37#include "buffer.h"
38#include "roaming.h"
39
40static size_t out_buf_size = 0;
41static char *out_buf = NULL;
42static size_t out_start;
43static size_t out_last;
44
45static u_int64_t write_bytes = 0;
46static u_int64_t read_bytes = 0;
47
48int roaming_enabled = 0;
49int resume_in_progress = 0;
50
51int
52get_snd_buf_size()
53{
54	int fd = packet_get_connection_out();
55	int optval, optvallen;
56
57	optvallen = sizeof(optval);
58	if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
59		optval = DEFAULT_ROAMBUF;
60	return optval;
61}
62
63int
64get_recv_buf_size()
65{
66	int fd = packet_get_connection_in();
67	int optval, optvallen;
68
69	optvallen = sizeof(optval);
70	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
71		optval = DEFAULT_ROAMBUF;
72	return optval;
73}
74
75void
76set_out_buffer_size(size_t size)
77{
78	/*
79	 * The buffer size can only be set once and the buffer will live
80	 * as long as the session lives.
81	 */
82	if (out_buf == NULL) {
83		out_buf_size = size;
84		out_buf = xmalloc(size);
85		out_start = 0;
86		out_last = 0;
87	}
88}
89
90u_int64_t
91get_recv_bytes(void)
92{
93	return read_bytes;
94}
95
96void
97add_recv_bytes(u_int64_t num)
98{
99	read_bytes += num;
100}
101
102u_int64_t
103get_sent_bytes(void)
104{
105	return write_bytes;
106}
107
108void
109roam_set_bytes(u_int64_t sent, u_int64_t recvd)
110{
111	read_bytes = recvd;
112	write_bytes = sent;
113}
114
115static void
116buf_append(const char *buf, size_t count)
117{
118	if (count > out_buf_size) {
119		buf += count - out_buf_size;
120		count = out_buf_size;
121	}
122	if (count < out_buf_size - out_last) {
123		memcpy(out_buf + out_last, buf, count);
124		if (out_start > out_last)
125			out_start += count;
126		out_last += count;
127	} else {
128		/* data will wrap */
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;
134	}
135}
136
137ssize_t
138roaming_write(int fd, const void *buf, size_t count, int *cont)
139{
140	ssize_t ret;
141
142	ret = write(fd, buf, count);
143	if (ret > 0 && !resume_in_progress) {
144		write_bytes += ret;
145		if (out_buf_size > 0)
146			buf_append(buf, ret);
147	}
148	debug3("Wrote %ld bytes for a total of %llu", (long)ret,
149	    (unsigned long long)write_bytes);
150	return ret;
151}
152
153ssize_t
154roaming_read(int fd, void *buf, size_t count, int *cont)
155{
156	ssize_t ret = read(fd, buf, count);
157	if (ret > 0) {
158		if (!resume_in_progress) {
159			read_bytes += ret;
160		}
161	}
162	return ret;
163}
164
165size_t
166roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
167    size_t count)
168{
169	size_t ret = atomicio(f, fd, buf, count);
170
171	if (f == vwrite && ret > 0 && !resume_in_progress) {
172		write_bytes += ret;
173	} else if (f == read && ret > 0 && !resume_in_progress) {
174		read_bytes += ret;
175	}
176	return ret;
177}
178
179void
180resend_bytes(int fd, u_int64_t *offset)
181{
182	size_t available, needed;
183
184	if (out_start < out_last)
185		available = out_last - out_start;
186	else
187		available = out_buf_size;
188	needed = write_bytes - *offset;
189	debug3("resend_bytes: resend %lu bytes from %llu",
190	    (unsigned long)needed, (unsigned long long)*offset);
191	if (needed > available)
192		fatal("Needed to resend more data than in the cache");
193	if (out_last < needed) {
194		int chunkend = needed - out_last;
195		atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
196		    chunkend);
197		atomicio(vwrite, fd, out_buf, out_last);
198	} else {
199		atomicio(vwrite, fd, out_buf + (out_last - needed), needed);
200	}
201}
202