support "sideload over ADB" mode
Rather than depending on the existence of some place to store a file
that is accessible to users on an an unbootable device (eg, a physical
sdcard, external USB drive, etc.), add support for sideloading
packages sent to the device with adb.
This change adds a "minimal adbd" which supports nothing but receiving
a package over adb (with the "adb sideload" command) and storing it to
a fixed filename in the /tmp ramdisk, from where it can be verified
and sideloaded in the usual way. This should be leave available even
on locked user-build devices.
The user can select "apply package from ADB" from the recovery menu,
which starts minimal-adb mode (shutting down any real adbd that may be
running). Once minimal-adb has received a package it exits
(restarting real adbd if appropriate) and then verification and
installation of the received package proceeds.
always initialize usb product, vendor, etc. for adb in recovery
Set these values even on non-debuggable builds, so that the mini-adb
now in recovery can work.
diff --git a/minadbd/utils.c b/minadbd/utils.c
new file mode 100644
index 0000000..91518ba
--- /dev/null
+++ b/minadbd/utils.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "utils.h"
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+char*
+buff_addc (char* buff, char* buffEnd, int c)
+{
+ int avail = buffEnd - buff;
+
+ if (avail <= 0) /* already in overflow mode */
+ return buff;
+
+ if (avail == 1) { /* overflowing, the last byte is reserved for zero */
+ buff[0] = 0;
+ return buff + 1;
+ }
+
+ buff[0] = (char) c; /* add char and terminating zero */
+ buff[1] = 0;
+ return buff + 1;
+}
+
+char*
+buff_adds (char* buff, char* buffEnd, const char* s)
+{
+ int slen = strlen(s);
+
+ return buff_addb(buff, buffEnd, s, slen);
+}
+
+char*
+buff_addb (char* buff, char* buffEnd, const void* data, int len)
+{
+ int avail = (buffEnd - buff);
+
+ if (avail <= 0 || len <= 0) /* already overflowing */
+ return buff;
+
+ if (len > avail)
+ len = avail;
+
+ memcpy(buff, data, len);
+
+ buff += len;
+
+ /* ensure there is a terminating zero */
+ if (buff >= buffEnd) { /* overflow */
+ buff[-1] = 0;
+ } else
+ buff[0] = 0;
+
+ return buff;
+}
+
+char*
+buff_add (char* buff, char* buffEnd, const char* format, ... )
+{
+ int avail;
+
+ avail = (buffEnd - buff);
+
+ if (avail > 0) {
+ va_list args;
+ int nn;
+
+ va_start(args, format);
+ nn = vsnprintf( buff, avail, format, args);
+ va_end(args);
+
+ if (nn < 0) {
+ /* some C libraries return -1 in case of overflow,
+ * but they will also do that if the format spec is
+ * invalid. We assume ADB is not buggy enough to
+ * trigger that last case. */
+ nn = avail;
+ }
+ else if (nn > avail) {
+ nn = avail;
+ }
+
+ buff += nn;
+
+ /* ensure that there is a terminating zero */
+ if (buff >= buffEnd)
+ buff[-1] = 0;
+ else
+ buff[0] = 0;
+ }
+ return buff;
+}