1 files changed, 201 insertions, 0 deletions

diff --git a/roaming_common.c b/roaming_common.c
new file mode 100644
index 000000000..73db09d79
--- /dev/null
+++ b/roaming_common.c
@@ -0,0 +1,201 @@
+/* $OpenBSD: roaming_common.c,v 1.5 2009/06/27 09:32:43 andreas Exp $ */
+/*
+ * Copyright (c) 2004-2009 AppGate Network Security AB
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <errno.h>
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "atomicio.h"
+#include "log.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "cipher.h"
+#include "buffer.h"
+#include "roaming.h"
+
+static size_t out_buf_size = 0;
+static char *out_buf = NULL;
+static size_t out_start;
+static size_t out_last;
+
+static u_int64_t write_bytes = 0;
+static u_int64_t read_bytes = 0;
+
+int roaming_enabled = 0;
+int resume_in_progress = 0;
+
+int
+get_snd_buf_size()
+{
+        int fd = packet_get_connection_out();
+        int optval, optvallen;
+
+        optvallen = sizeof(optval);
+        if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
+                optval = DEFAULT_ROAMBUF;
+        return optval;
+}
+
+int
+get_recv_buf_size()
+{
+        int fd = packet_get_connection_in();
+        int optval, optvallen;
+
+        optvallen = sizeof(optval);
+        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
+                optval = DEFAULT_ROAMBUF;
+        return optval;
+}
+
+void
+set_out_buffer_size(size_t size)
+{
+        /*
+         * The buffer size can only be set once and the buffer will live
+         * as long as the session lives.
+         */
+        if (out_buf == NULL) {
+                out_buf_size = size;
+                out_buf = xmalloc(size);
+                out_start = 0;
+                out_last = 0;
+        }
+}
+
+u_int64_t
+get_recv_bytes(void)
+{
+        return read_bytes;
+}
+
+void
+add_recv_bytes(u_int64_t num)
+{
+        read_bytes += num;
+}
+
+u_int64_t
+get_sent_bytes(void)
+{
+        return write_bytes;
+}
+
+void
+roam_set_bytes(u_int64_t sent, u_int64_t recvd)
+{
+        read_bytes = recvd;
+        write_bytes = sent;
+}
+
+static void
+buf_append(const char *buf, size_t count)
+{
+        if (count > out_buf_size) {
+                buf += count - out_buf_size;
+                count = out_buf_size;
+        }
+        if (count < out_buf_size - out_last) {
+                memcpy(out_buf + out_last, buf, count);
+                if (out_start > out_last)
+                        out_start += count;
+                out_last += count;
+        } else {
+                /* data will wrap */
+                size_t chunk = out_buf_size - out_last;
+                memcpy(out_buf + out_last, buf, chunk);
+                memcpy(out_buf, buf + chunk, count - chunk);
+                out_last = count - chunk;
+                out_start = out_last + 1;
+        }
+}
+
+ssize_t
+roaming_write(int fd, const void *buf, size_t count, int *cont)
+{
+        ssize_t ret;
+
+        ret = write(fd, buf, count);
+        if (ret > 0 && !resume_in_progress) {
+                write_bytes += ret;
+                if (out_buf_size > 0)
+                        buf_append(buf, ret);
+        }
+        debug3("Wrote %ld bytes for a total of %llu", (long)ret,
+            (unsigned long long)write_bytes);
+        return ret;
+}
+
+ssize_t
+roaming_read(int fd, void *buf, size_t count, int *cont)
+{
+        ssize_t ret = read(fd, buf, count);
+        if (ret > 0) {
+                if (!resume_in_progress) {
+                        read_bytes += ret;
+                }
+        }
+        return ret;
+}
+
+size_t
+roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
+    size_t count)
+{
+        size_t ret = atomicio(f, fd, buf, count);
+
+        if (f == vwrite && ret > 0 && !resume_in_progress) {
+                write_bytes += ret;
+        } else if (f == read && ret > 0 && !resume_in_progress) {
+                read_bytes += ret;
+        }
+        return ret;
+}
+
+void
+resend_bytes(int fd, u_int64_t *offset)
+{
+        size_t available, needed;
+
+        if (out_start < out_last)
+                available = out_last - out_start;
+        else
+                available = out_buf_size;
+        needed = write_bytes - *offset;
+        debug3("resend_bytes: resend %lu bytes from %llu",
+            (unsigned long)needed, (unsigned long long)*offset);
+        if (needed > available)
+                fatal("Needed to resend more data than in the cache");
+        if (out_last < needed) {
+                int chunkend = needed - out_last;
+                atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
+                    chunkend);
+                atomicio(vwrite, fd, out_buf, out_last);
+        } else {
+                atomicio(vwrite, fd, out_buf + (out_last - needed), needed);
+        }
+}