Initial revision

[gssapi-openssh.git] / openssh / roaming_common.c

diff --git a/openssh/roaming_common.c b/openssh/roaming_common.c
new file mode 100644 (file)
index 0000000..73db09d
--- /dev/null
+++ b/openssh/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);
+       }
+}