1 files changed, 386 insertions, 0 deletions
diff --git a/bootloader_message_twrp/bootloader_message.cpp b/bootloader_message_twrp/bootloader_message.cpp
new file mode 100644
index 000000000..55d3a5d9e
--- /dev/null
+++ b/bootloader_message_twrp/bootloader_message.cpp
@@ -0,0 +1,386 @@
+/*
+ * Copyright (C) 2016 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 <bootloader_message_twrp/bootloader_message.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/system_properties.h>
+
+#include <string>
+#include <vector>
+
+static std::string misc_blkdev;
+
+void set_misc_device(const char* name) {
+    misc_blkdev = name;
+}
+
+static std::string get_misc_blk_device(std::string* err) {
+  *err = "";
+  return misc_blkdev;
+}
+
+// In recovery mode, recovery can get started and try to access the misc
+// device before the kernel has actually created it.
+static bool wait_for_device(const std::string& blk_device, std::string* err) {
+  int tries = 0;
+  int ret;
+  err->clear();
+  do {
+    ++tries;
+    struct stat buf;
+    ret = stat(blk_device.c_str(), &buf);
+    if (ret == -1) {
+      char buffer[2048];
+      sprintf(buffer, "failed to stat %s try %d: %s\n",
+                                          blk_device.c_str(), tries, strerror(errno));
+      *err += buffer;
+      /*
+      *err += android::base::StringPrintf("failed to stat %s try %d: %s\n",
+                                          blk_device.c_str(), tries, strerror(errno));
+      */
+      sleep(1);
+    }
+  } while (ret && tries < 10);
+
+  if (ret) {
+    *err += "failed to stat " + blk_device + "\n";
+    /*
+    *err += android::base::StringPrintf("failed to stat %s\n", blk_device.c_str());
+    */
+  }
+  return ret == 0;
+}
+
+static bool read_misc_partition(void* p, size_t size, const std::string& misc_blk_device,
+                                size_t offset, std::string* err) {
+  if (!wait_for_device(misc_blk_device, err)) {
+    return false;
+  }
+
+  int fd(open(misc_blk_device.c_str(), O_RDONLY));
+  if (fd < 0) {
+    *err = "failed to open " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    /*
+  android::base::unique_fd fd(open(misc_blk_device.c_str(), O_RDONLY));
+  if (fd == -1) {
+    *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+  if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
+    *err = "failed to lseek " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    close(fd);
+    /*
+
+    *err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+
+  if ((size_t)read(fd, p, size) != size) {
+    *err = "failed to read " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    close(fd);
+    /*
+  if (!android::base::ReadFully(fd, p, size)) {
+    *err = android::base::StringPrintf("failed to read %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+  close(fd);
+  return true;
+}
+
+static bool write_misc_partition(const void* p, size_t size, size_t offset, std::string* err) {
+  std::string misc_blk_device = get_misc_blk_device(err);
+  if (misc_blk_device.empty()) {
+    *err = "no misc device set";
+    return false;
+  }
+  int fd = (open(misc_blk_device.c_str(), O_WRONLY | O_SYNC));
+  if (fd == -1) {
+    *err = "failed to open " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    /*
+static bool write_misc_partition(const void* p, size_t size, const std::string& misc_blk_device,
+                                 size_t offset, std::string* err) {
+  android::base::unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY));
+  if (fd == -1) {
+    *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+  if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
+    *err = "failed to lseek " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    close(fd);
+    /*
+    *err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+  if ((size_t)write(fd, p, size) != size) {
+    *err = "failed to write " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    close(fd);
+    /*
+  if (!android::base::WriteFully(fd, p, size)) {
+    *err = android::base::StringPrintf("failed to write %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+
+  // TODO: O_SYNC and fsync duplicates each other?
+  if (fsync(fd) == -1) {
+    *err = "failed to fsync " + misc_blk_device + ": ";
+    *err += strerror(errno);
+    close(fd);
+    /*
+  if (fsync(fd) == -1) {
+    *err = android::base::StringPrintf("failed to fsync %s: %s", misc_blk_device.c_str(),
+                                       strerror(errno));
+    */
+    return false;
+  }
+  close(fd);
+  return true;
+}
+
+bool read_bootloader_message_from(bootloader_message* boot, const std::string& misc_blk_device,
+                                  std::string* err) {
+  return read_misc_partition(boot, sizeof(*boot), misc_blk_device,
+                             BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
+}
+
+bool read_bootloader_message(bootloader_message* boot, std::string* err) {
+  std::string misc_blk_device = get_misc_blk_device(err);
+  if (misc_blk_device.empty()) {
+    return false;
+  }
+  return read_bootloader_message_from(boot, misc_blk_device, err);
+}
+
+bool write_bootloader_message_to(const bootloader_message& boot, __unused const std::string& misc_blk_device,
+                                 std::string* err) {
+  return write_misc_partition(&boot, sizeof(boot),
+                              BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
+}
+
+bool write_bootloader_message(const bootloader_message& boot, std::string* err) {
+  std::string misc_blk_device = get_misc_blk_device(err);
+  if (misc_blk_device.empty()) {
+    return false;
+  }
+  return write_bootloader_message_to(boot, misc_blk_device, err);
+}
+
+// libc++ in 5.1 does not know how to handle a std::string* so this craziness is needed
+bool clear_bootloader_message(void* err) {
+  std::string &s = *(static_cast<std::string*>(err));
+  return clear_bootloader_message(&s);
+}
+
+bool clear_bootloader_message(std::string* err) {
+  bootloader_message boot = {};
+  return write_bootloader_message(boot, err);
+}
+
+bool write_bootloader_message(const std::vector<std::string>& options, std::string* err) {
+  bootloader_message boot = {};
+  strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
+  strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
+  for (const auto& s : options) {
+    strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery));
+    if (s.substr(s.size() - 1) != "\n") {
+      strlcat(boot.recovery, "\n", sizeof(boot.recovery));
+    }
+  }
+  return write_bootloader_message(boot, err);
+}
+
+bool update_bootloader_message(const std::vector<std::string>& options, std::string* err) {
+  bootloader_message boot;
+  if (!read_bootloader_message(&boot, err)) {
+    return false;
+  }
+
+  // Zero out the entire fields.
+  memset(boot.command, 0, sizeof(boot.command));
+  memset(boot.recovery, 0, sizeof(boot.recovery));
+
+  strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
+  strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
+  for (const auto& s : options) {
+    strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery));
+    if (s.back() != '\n') {
+      strlcat(boot.recovery, "\n", sizeof(boot.recovery));
+    }
+  }
+  return write_bootloader_message(boot, err);
+}
+
+bool write_reboot_bootloader(std::string* err) {
+  bootloader_message boot;
+  if (!read_bootloader_message(&boot, err)) {
+    return false;
+  }
+  if (boot.command[0] != '\0') {
+    *err = "Bootloader command pending.";
+    return false;
+  }
+  strlcpy(boot.command, "bootonce-bootloader", sizeof(boot.command));
+  return write_bootloader_message(boot, err);
+}
+
+bool read_wipe_package(std::string* package_data, size_t size, std::string* err) {
+  std::string misc_blk_device = get_misc_blk_device(err);
+  if (misc_blk_device.empty()) {
+    return false;
+  }
+  package_data->resize(size);
+  return read_misc_partition(&(*package_data)[0], size, misc_blk_device,
+                             WIPE_PACKAGE_OFFSET_IN_MISC, err);
+}
+
+bool write_wipe_package(const std::string& package_data, std::string* err) {
+  std::string misc_blk_device = get_misc_blk_device(err);
+  if (misc_blk_device.empty()) {
+    return false;
+  }
+  return write_misc_partition(package_data.data(), package_data.size(),
+                              WIPE_PACKAGE_OFFSET_IN_MISC, err);
+}
+
+extern "C" bool write_reboot_bootloader(void) {
+  std::string err;
+  return write_reboot_bootloader(&err);
+}
+
+extern "C" bool write_bootloader_message(const char* options) {
+  std::string err;
+  bootloader_message boot = {};
+  memcpy(&boot, options, sizeof(boot));
+  return write_bootloader_message(boot, &err);
+}
+
+static const char *COMMAND_FILE = "/cache/recovery/command";
+static const int MAX_ARG_LENGTH = 4096;
+static const int MAX_ARGS = 100;
+
+// command line args come from, in decreasing precedence:
+//   - the actual command line
+//   - the bootloader control block (one per line, after "recovery")
+//   - the contents of COMMAND_FILE (one per line)
+void
+get_args(int *argc, char ***argv) {
+    bootloader_message boot = {};
+    std::string err;
+    if (!read_bootloader_message(&boot, &err)) {
+        printf("%s\n", err.c_str());
+        // If fails, leave a zeroed bootloader_message.
+        memset(&boot, 0, sizeof(boot));
+    }
+    //stage = strndup(boot.stage, sizeof(boot.stage));
+
+    if (boot.command[0] != 0 && boot.command[0] != 255) {
+        printf("Boot command: %.*s\n", (int)sizeof(boot.command), boot.command);
+    }
+
+    if (boot.status[0] != 0 && boot.status[0] != 255) {
+        printf("Boot status: %.*s\n", (int)sizeof(boot.status), boot.status);
+    }
+
+    // --- if arguments weren't supplied, look in the bootloader control block
+    if (*argc <= 1) {
+        boot.recovery[sizeof(boot.recovery) - 1] = '\0';  // Ensure termination
+        const char *arg = strtok(boot.recovery, "\n");
+        if (arg != NULL && !strcmp(arg, "recovery")) {
+            *argv = (char **) malloc(sizeof(char *) * MAX_ARGS);
+            (*argv)[0] = strdup(arg);
+            for (*argc = 1; *argc < MAX_ARGS; ++*argc) {
+                if ((arg = strtok(NULL, "\n")) == NULL) break;
+
+// if the device does not have an own recovery key combo we just want to open TWRP after
+// walking through the factory reset screen - without actually doing a factory reset
+#ifdef IGNORE_MISC_WIPE_DATA
+                if (!strcmp(arg, "--wipe_data")) {
+                    (*argv)[*argc] = "";
+                    *argc = *argc -1;
+                    printf("Bootloader arg \"%s\" ignored because TWRP was compiled with TW_IGNORE_MISC_WIPE_DATA\n", arg);
+                    continue;
+                }
+#endif
+                (*argv)[*argc] = strdup(arg);
+            }
+            printf("Got arguments from boot message\n");
+        } else if (boot.recovery[0] != 0 && boot.recovery[0] != 255) {
+            printf("Bad boot message\n\"%.20s\"\n", boot.recovery);
+        }
+    }
+
+    // --- if that doesn't work, try the command file (if we have /cache).
+    if (*argc <= 1/* && has_cache*/) {
+        FILE *fp = fopen(COMMAND_FILE, "r");
+        if (fp != NULL) {
+            char *token;
+            char *argv0 = (*argv)[0];
+            *argv = (char **) malloc(sizeof(char *) * MAX_ARGS);
+            (*argv)[0] = argv0;  // use the same program name
+
+            char buf[MAX_ARG_LENGTH];
+            for (*argc = 1; *argc < MAX_ARGS; ++*argc) {
+                if (!fgets(buf, sizeof(buf), fp)) break;
+                token = strtok(buf, "\r\n");
+                if (token != NULL) {
+                    (*argv)[*argc] = strdup(token);  // Strip newline.
+                } else {
+                    --*argc;
+                }
+            }
+
+            fclose(fp);
+            printf("Got arguments from %s\n", COMMAND_FILE);
+        }
+    }
+
+    // --> write the arguments we have back into the bootloader control block
+    // always boot into recovery after this (until finish_recovery() is called)
+    strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
+    strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
+    int i;
+    for (i = 1; i < *argc; ++i) {
+        strlcat(boot.recovery, (*argv)[i], sizeof(boot.recovery));
+        strlcat(boot.recovery, "\n", sizeof(boot.recovery));
+    }
+    if (!write_bootloader_message(boot, &err)) {
+        printf("%s\n", err.c_str());
+    }
+}