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/* $OpenBSD: roaming_common.c,v 1.5 2009/06/27 09:32:43 andreas Exp $ */
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* Copyright (c) 2004-2009 AppGate Network Security AB
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifdef HAVE_INTTYPES_H
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static size_t out_buf_size = 0;
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static char *out_buf = NULL;
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static size_t out_start;
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static size_t out_last;
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static u_int64_t write_bytes = 0;
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static u_int64_t read_bytes = 0;
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int roaming_enabled = 0;
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int resume_in_progress = 0;
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int fd = packet_get_connection_out();
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int optval, optvallen;
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optvallen = sizeof(optval);
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if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
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optval = DEFAULT_ROAMBUF;
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int fd = packet_get_connection_in();
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int optval, optvallen;
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optvallen = sizeof(optval);
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if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
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optval = DEFAULT_ROAMBUF;
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set_out_buffer_size(size_t size)
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* The buffer size can only be set once and the buffer will live
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* as long as the session lives.
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if (out_buf == NULL) {
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out_buf = xmalloc(size);
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add_recv_bytes(u_int64_t num)
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roam_set_bytes(u_int64_t sent, u_int64_t recvd)
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buf_append(const char *buf, size_t count)
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if (count > out_buf_size) {
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buf += count - out_buf_size;
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count = out_buf_size;
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if (count < out_buf_size - out_last) {
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memcpy(out_buf + out_last, buf, count);
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if (out_start > out_last)
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size_t chunk = out_buf_size - out_last;
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memcpy(out_buf + out_last, buf, chunk);
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memcpy(out_buf, buf + chunk, count - chunk);
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out_last = count - chunk;
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out_start = out_last + 1;
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roaming_write(int fd, const void *buf, size_t count, int *cont)
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ret = write(fd, buf, count);
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if (ret > 0 && !resume_in_progress) {
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if (out_buf_size > 0)
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buf_append(buf, ret);
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debug3("Wrote %ld bytes for a total of %llu", (long)ret,
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(unsigned long long)write_bytes);
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roaming_read(int fd, void *buf, size_t count, int *cont)
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ssize_t ret = read(fd, buf, count);
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if (!resume_in_progress) {
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roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
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size_t ret = atomicio(f, fd, buf, count);
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if (f == vwrite && ret > 0 && !resume_in_progress) {
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} else if (f == read && ret > 0 && !resume_in_progress) {
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resend_bytes(int fd, u_int64_t *offset)
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size_t available, needed;
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if (out_start < out_last)
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available = out_last - out_start;
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available = out_buf_size;
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needed = write_bytes - *offset;
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debug3("resend_bytes: resend %lu bytes from %llu",
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(unsigned long)needed, (unsigned long long)*offset);
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if (needed > available)
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fatal("Needed to resend more data than in the cache");
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if (out_last < needed) {
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int chunkend = needed - out_last;
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atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
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atomicio(vwrite, fd, out_buf, out_last);
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atomicio(vwrite, fd, out_buf + (out_last - needed), needed);