install.c - android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2007 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 <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>

 #include "amend/amend.h"
 #include "common.h"
 #include "install.h"
 #include "mincrypt/rsa.h"
 #include "minui/minui.h"
 #include "minzip/SysUtil.h"
 #include "minzip/Zip.h"
 #include "mtdutils/mounts.h"
 #include "mtdutils/mtdutils.h"
 #include "roots.h"
 #include "verifier.h"
 #include "firmware.h"

 #define ASSUMED_UPDATE_SCRIPT_NAME  "META-INF/com/google/android/update-script"
 #define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
 #define PUBLIC_KEYS_FILE "/res/keys"

 static const ZipEntry *
 find_update_script(ZipArchive *zip)
 {
 //TODO: Get the location of this script from the MANIFEST.MF file
     return mzFindZipEntry(zip, ASSUMED_UPDATE_SCRIPT_NAME);
 }

 static int read_data(ZipArchive *zip, const ZipEntry *entry,
         char** ppData, int* pLength) {
     int len = (int)mzGetZipEntryUncompLen(entry);
     if (len <= 0) {
         LOGE("Bad data length %d\n", len);
         return -1;
     }
     char *data = malloc(len + 1);
     if (data == NULL) {
         LOGE("Can't allocate %d bytes for data\n", len + 1);
         return -2;
     }
     bool ok = mzReadZipEntry(zip, entry, data, len);
     if (!ok) {
         LOGE("Error while reading data\n");
         free(data);
         return -3;
     }
     data[len] = '\0';     // not necessary, but just to be safe
     *ppData = data;
     if (pLength) {
         *pLength = len;
     }
     return 0;
 }

 static int
 handle_update_script(ZipArchive *zip, const ZipEntry *update_script_entry)
 {
     /* Read the entire script into a buffer.
      */
     int script_len;
     char* script_data;
     if (read_data(zip, update_script_entry, &script_data, &script_len) < 0) {
         LOGE("Can't read update script\n");
         return INSTALL_ERROR;
     }

     /* Parse the script.  Note that the script and parse tree are never freed.
      */
     const AmCommandList *commands = parseAmendScript(script_data, script_len);
     if (commands == NULL) {
         LOGE("Syntax error in update script\n");
         return INSTALL_ERROR;
     } else {
         UnterminatedString name = mzGetZipEntryFileName(update_script_entry);
         LOGI("Parsed %.*s\n", name.len, name.str);
     }

     /* Execute the script.
      */
     int ret = execCommandList((ExecContext *)1, commands);
     if (ret != 0) {
         int num = ret;
         char *line = NULL, *next = script_data;
         while (next != NULL && ret-- > 0) {
             line = next;
             next = memchr(line, '\n', script_data + script_len - line);
             if (next != NULL) *next++ = '\0';
         }
         LOGE("Failure at line %d:\n%s\n", num, next ? line : "(not found)");
         return INSTALL_ERROR;
     }

     LOGI("Installation complete.\n");
     return INSTALL_SUCCESS;
 }

 // The update binary ask us to install a firmware file on reboot.  Set
 // that up.  Takes ownership of type and filename.
 static int
 handle_firmware_update(char* type, char* filename) {
     struct stat st_data;
     if (stat(filename, &st_data) < 0) {
         LOGE("Error stat'ing %s: %s\n", filename, strerror(errno));
         return INSTALL_ERROR;
     }

     LOGI("type is [%s]\n", type);

     char* data = malloc(st_data.st_size);
     if (data == NULL) {
         LOGE("Can't allocate %d bytes for firmware data\n", st_data.st_size);
         return INSTALL_ERROR;
     }

     FILE* f = fopen(filename, "rb");
     if (f == NULL) {
         LOGE("Failed to open %s: %s\n", filename, strerror(errno));
         return INSTALL_ERROR;
     }
     if (fread(data, 1, st_data.st_size, f) != st_data.st_size) {
         LOGE("Failed to read firmware data: %s\n", strerror(errno));
         return INSTALL_ERROR;
     }
     fclose(f);

     if (remember_firmware_update(type, data, st_data.st_size)) {
         LOGE("Can't store %s image\n", type);
         free(data);
         return INSTALL_ERROR;
     }
     free(filename);

     return INSTALL_SUCCESS;
 }

 // If the package contains an update binary, extract it and run it.
 static int
 try_update_binary(const char *path, ZipArchive *zip) {
     const ZipEntry* binary_entry =
             mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
     if (binary_entry == NULL) {
         return INSTALL_CORRUPT;
     }

     char* binary = "/tmp/update_binary";
     unlink(binary);
     int fd = creat(binary, 0755);
     if (fd < 0) {
         LOGE("Can't make %s\n", binary);
         return 1;
     }
     bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
     close(fd);

     if (!ok) {
         LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
         return 1;
     }

     int pipefd[2];
     pipe(pipefd);

     // When executing the update binary contained in the package, the
     // arguments passed are:
     //
     //   - the version number for this interface (currently 1)
     //
     //   - an fd to which the program can write in order to update the
     //     progress bar.  The program can write single-line commands:
     //
     //        progress <frac> <secs>
     //            fill up <frac> of the progress bar over <secs> seconds.
     //
     //        firmware <"hboot"|"radio"> <filename>
     //            arrange to install the contents of <filename> in the
     //            given partition on reboot.
     //
     //   - the name of the package zip file.
     //

     char** args = malloc(sizeof(char*) * 5);
     args[0] = binary;
     args[1] = "1";
     args[2] = malloc(10);
     sprintf(args[2], "%d", pipefd[1]);
     args[3] = (char*)path;
     args[4] = NULL;

     pid_t pid = fork();
     if (pid == 0) {
         close(pipefd[0]);
         execv(binary, args);
         fprintf(stderr, "E:Can't run %s (%s)\n", binary, strerror(errno));
         _exit(-1);
     }
     close(pipefd[1]);

     char* firmware_type = NULL;
     char* firmware_filename = NULL;

     char buffer[81];
     FILE* from_child = fdopen(pipefd[0], "r");
     while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
         LOGI("read: %s", buffer);

         char* command = strtok(buffer, " \n");
         if (command == NULL) {
             continue;
         } else if (strcmp(command, "progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             char* seconds_s = strtok(NULL, " \n");

             float fraction = strtof(fraction_s, NULL);
             int seconds = strtol(seconds_s, NULL, 10);

             ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
                              seconds);
         } else if (strcmp(command, "firmware") == 0) {
             char* type = strtok(NULL, " \n");
             char* filename = strtok(NULL, " \n");

             if (type != NULL && filename != NULL) {
                 if (firmware_type != NULL) {
                     LOGE("ignoring attempt to do multiple firmware updates");
                 } else {
                     firmware_type = strdup(type);
                     firmware_filename = strdup(filename);
                 }
             }
         } else {
             LOGE("unknown command [%s]\n", command);
         }
     }
     fclose(from_child);

     int status;
     waitpid(pid, &status, 0);
     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
         LOGE("Error in %s\n(Status %d)\n", path, status);
         return INSTALL_ERROR;
     }

     if (firmware_type != NULL) {
         return handle_firmware_update(firmware_type, firmware_filename);
     } else {
         return INSTALL_SUCCESS;
     }
 }

 static int
 handle_update_package(const char *path, ZipArchive *zip,
                       const RSAPublicKey *keys, int numKeys)
 {
     // Give verification half the progress bar...
     ui_print("Verifying update package...\n");
     ui_show_progress(
             VERIFICATION_PROGRESS_FRACTION,
             VERIFICATION_PROGRESS_TIME);

     if (!verify_jar_signature(zip, keys, numKeys)) {
         LOGE("Verification failed\n");
         return INSTALL_CORRUPT;
     }

     // Update should take the rest of the progress bar.
     ui_print("Installing update...\n");

     int result = try_update_binary(path, zip);
     if (result == INSTALL_SUCCESS || result == INSTALL_ERROR) {
         register_package_root(NULL, NULL);  // Unregister package root
         return result;
     }

     // if INSTALL_CORRUPT is returned, this package doesn't have an
     // update binary.  Fall back to the older mechanism of looking for
     // an update script.

     const ZipEntry *script_entry;
     script_entry = find_update_script(zip);
     if (script_entry == NULL) {
         LOGE("Can't find update script\n");
         return INSTALL_CORRUPT;
     }

     if (register_package_root(zip, path) < 0) {
         LOGE("Can't register package root\n");
         return INSTALL_ERROR;
     }

     int ret = handle_update_script(zip, script_entry);
     register_package_root(NULL, NULL);  // Unregister package root
     return ret;
 }

 // Reads a file containing one or more public keys as produced by
 // DumpPublicKey:  this is an RSAPublicKey struct as it would appear
 // as a C source literal, eg:
 //
 //  "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
 //
 // (Note that the braces and commas in this example are actual
 // characters the parser expects to find in the file; the ellipses
 // indicate more numbers omitted from this example.)
 //
 // The file may contain multiple keys in this format, separated by
 // commas.  The last key must not be followed by a comma.
 //
 // Returns NULL if the file failed to parse, or if it contain zero keys.
 static RSAPublicKey*
 load_keys(const char* filename, int* numKeys) {
     RSAPublicKey* out = NULL;
     *numKeys = 0;

     FILE* f = fopen(filename, "r");
     if (f == NULL) {
         LOGE("opening %s: %s\n", filename, strerror(errno));
         goto exit;
     }

     int i;
     bool done = false;
     while (!done) {
         ++*numKeys;
         out = realloc(out, *numKeys * sizeof(RSAPublicKey));
         RSAPublicKey* key = out + (*numKeys - 1);
         if (fscanf(f, " { %i , %i , { %i",
                    &(key->len), &(key->n0inv), &(key->n[0])) != 3) {
             goto exit;
         }
         if (key->len != RSANUMWORDS) {
             LOGE("key length (%d) does not match expected size\n", key->len);
             goto exit;
         }
         for (i = 1; i < key->len; ++i) {
             if (fscanf(f, " , %i", &(key->n[i])) != 1) goto exit;
         }
         if (fscanf(f, " } , { %i", &(key->rr[0])) != 1) goto exit;
         for (i = 1; i < key->len; ++i) {
             if (fscanf(f, " , %i", &(key->rr[i])) != 1) goto exit;
         }
         fscanf(f, " } } ");

         // if the line ends in a comma, this file has more keys.
         switch (fgetc(f)) {
             case ',':
                 // more keys to come.
                 break;

             case EOF:
                 done = true;
                 break;

             default:
                 LOGE("unexpected character between keys\n");
                 goto exit;
         }
     }

     fclose(f);
     return out;

 exit:
     if (f) fclose(f);
     free(out);
     *numKeys = 0;
     return NULL;
 }

 int
 install_package(const char *root_path)
 {
     ui_set_background(BACKGROUND_ICON_INSTALLING);
     ui_print("Finding update package...\n");
     ui_show_indeterminate_progress();
     LOGI("Update location: %s\n", root_path);

     if (ensure_root_path_mounted(root_path) != 0) {
         LOGE("Can't mount %s\n", root_path);
         return INSTALL_CORRUPT;
     }

     char path[PATH_MAX] = "";
     if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
         LOGE("Bad path %s\n", root_path);
         return INSTALL_CORRUPT;
     }

     ui_print("Opening update package...\n");
     LOGI("Update file path: %s\n", path);

     int numKeys;
     RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
     if (loadedKeys == NULL) {
         LOGE("Failed to load keys\n");
         return INSTALL_CORRUPT;
     }
     LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);

     /* Try to open the package.
      */
     ZipArchive zip;
     int err = mzOpenZipArchive(path, &zip);
     if (err != 0) {
         LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
         return INSTALL_CORRUPT;
     }

     /* Verify and install the contents of the package.
      */
     int status = handle_update_package(path, &zip, loadedKeys, numKeys);
     mzCloseZipArchive(&zip);
     free(loadedKeys);
     return status;
 }
	/*
	* Copyright (C) 2007 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 <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <limits.h>
	#include <sys/stat.h>
	#include <sys/wait.h>
	#include <unistd.h>

	#include "amend/amend.h"
	#include "common.h"
	#include "install.h"
	#include "mincrypt/rsa.h"
	#include "minui/minui.h"
	#include "minzip/SysUtil.h"
	#include "minzip/Zip.h"
	#include "mtdutils/mounts.h"
	#include "mtdutils/mtdutils.h"
	#include "roots.h"
	#include "verifier.h"
	#include "firmware.h"

	#define ASSUMED_UPDATE_SCRIPT_NAME "META-INF/com/google/android/update-script"
	#define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary"
	#define PUBLIC_KEYS_FILE "/res/keys"

	static const ZipEntry *
	find_update_script(ZipArchive *zip)
	{
	//TODO: Get the location of this script from the MANIFEST.MF file
	return mzFindZipEntry(zip, ASSUMED_UPDATE_SCRIPT_NAME);
	}

	static int read_data(ZipArchive zip, const ZipEntry entry,
	char** ppData, int* pLength) {
	int len = (int)mzGetZipEntryUncompLen(entry);
	if (len <= 0) {
	LOGE("Bad data length %d\n", len);
	return -1;
	}
	char *data = malloc(len + 1);
	if (data == NULL) {
	LOGE("Can't allocate %d bytes for data\n", len + 1);
	return -2;
	}
	bool ok = mzReadZipEntry(zip, entry, data, len);
	if (!ok) {
	LOGE("Error while reading data\n");
	free(data);
	return -3;
	}
	data[len] = '\0'; // not necessary, but just to be safe
	*ppData = data;
	if (pLength) {
	*pLength = len;
	}
	return 0;
	}

	static int
	handle_update_script(ZipArchive zip, const ZipEntry update_script_entry)
	{
	/* Read the entire script into a buffer.
	*/
	int script_len;
	char* script_data;
	if (read_data(zip, update_script_entry, &script_data, &script_len) < 0) {
	LOGE("Can't read update script\n");
	return INSTALL_ERROR;
	}

	/* Parse the script. Note that the script and parse tree are never freed.
	*/
	const AmCommandList *commands = parseAmendScript(script_data, script_len);
	if (commands == NULL) {
	LOGE("Syntax error in update script\n");
	return INSTALL_ERROR;
	} else {
	UnterminatedString name = mzGetZipEntryFileName(update_script_entry);
	LOGI("Parsed %.*s\n", name.len, name.str);
	}

	/* Execute the script.
	*/
	int ret = execCommandList((ExecContext *)1, commands);
	if (ret != 0) {
	int num = ret;
	char line = NULL, next = script_data;
	while (next != NULL && ret-- > 0) {
	line = next;
	next = memchr(line, '\n', script_data + script_len - line);
	if (next != NULL) *next++ = '\0';
	}
	LOGE("Failure at line %d:\n%s\n", num, next ? line : "(not found)");
	return INSTALL_ERROR;
	}

	LOGI("Installation complete.\n");
	return INSTALL_SUCCESS;
	}

	// The update binary ask us to install a firmware file on reboot. Set
	// that up. Takes ownership of type and filename.
	static int
	handle_firmware_update(char* type, char* filename) {
	struct stat st_data;
	if (stat(filename, &st_data) < 0) {
	LOGE("Error stat'ing %s: %s\n", filename, strerror(errno));
	return INSTALL_ERROR;
	}

	LOGI("type is [%s]\n", type);

	char* data = malloc(st_data.st_size);
	if (data == NULL) {
	LOGE("Can't allocate %d bytes for firmware data\n", st_data.st_size);
	return INSTALL_ERROR;
	}

	FILE* f = fopen(filename, "rb");
	if (f == NULL) {
	LOGE("Failed to open %s: %s\n", filename, strerror(errno));
	return INSTALL_ERROR;
	}
	if (fread(data, 1, st_data.st_size, f) != st_data.st_size) {
	LOGE("Failed to read firmware data: %s\n", strerror(errno));
	return INSTALL_ERROR;
	}
	fclose(f);

	if (remember_firmware_update(type, data, st_data.st_size)) {
	LOGE("Can't store %s image\n", type);
	free(data);
	return INSTALL_ERROR;
	}
	free(filename);

	return INSTALL_SUCCESS;
	}

	// If the package contains an update binary, extract it and run it.
	static int
	try_update_binary(const char path, ZipArchive zip) {
	const ZipEntry* binary_entry =
	mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
	if (binary_entry == NULL) {
	return INSTALL_CORRUPT;
	}

	char* binary = "/tmp/update_binary";
	unlink(binary);
	int fd = creat(binary, 0755);
	if (fd < 0) {
	LOGE("Can't make %s\n", binary);
	return 1;
	}
	bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
	close(fd);

	if (!ok) {
	LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
	return 1;
	}

	int pipefd[2];
	pipe(pipefd);

	// When executing the update binary contained in the package, the
	// arguments passed are:
	//
	// - the version number for this interface (currently 1)
	//
	// - an fd to which the program can write in order to update the
	// progress bar. The program can write single-line commands:
	//
	// progress <frac> <secs>
	// fill up <frac> of the progress bar over <secs> seconds.
	//
	// firmware <"hboot"\|"radio"> <filename>
	// arrange to install the contents of <filename> in the
	// given partition on reboot.
	//
	// - the name of the package zip file.
	//

	char** args = malloc(sizeof(char) 5);
	args[0] = binary;
	args[1] = "1";
	args[2] = malloc(10);
	sprintf(args[2], "%d", pipefd[1]);
	args[3] = (char*)path;
	args[4] = NULL;

	pid_t pid = fork();
	if (pid == 0) {
	close(pipefd[0]);
	execv(binary, args);
	fprintf(stderr, "E:Can't run %s (%s)\n", binary, strerror(errno));
	_exit(-1);
	}
	close(pipefd[1]);

	char* firmware_type = NULL;
	char* firmware_filename = NULL;

	char buffer[81];
	FILE* from_child = fdopen(pipefd[0], "r");
	while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
	LOGI("read: %s", buffer);

	char* command = strtok(buffer, " \n");
	if (command == NULL) {
	continue;
	} else if (strcmp(command, "progress") == 0) {
	char* fraction_s = strtok(NULL, " \n");
	char* seconds_s = strtok(NULL, " \n");

	float fraction = strtof(fraction_s, NULL);
	int seconds = strtol(seconds_s, NULL, 10);

	ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
	seconds);
	} else if (strcmp(command, "firmware") == 0) {
	char* type = strtok(NULL, " \n");
	char* filename = strtok(NULL, " \n");

	if (type != NULL && filename != NULL) {
	if (firmware_type != NULL) {
	LOGE("ignoring attempt to do multiple firmware updates");
	} else {
	firmware_type = strdup(type);
	firmware_filename = strdup(filename);
	}
	}
	} else {
	LOGE("unknown command [%s]\n", command);
	}
	}
	fclose(from_child);

	int status;
	waitpid(pid, &status, 0);
	if (!WIFEXITED(status) \|\| WEXITSTATUS(status) != 0) {
	LOGE("Error in %s\n(Status %d)\n", path, status);
	return INSTALL_ERROR;
	}

	if (firmware_type != NULL) {
	return handle_firmware_update(firmware_type, firmware_filename);
	} else {
	return INSTALL_SUCCESS;
	}
	}

	static int
	handle_update_package(const char path, ZipArchive zip,
	const RSAPublicKey *keys, int numKeys)
	{
	// Give verification half the progress bar...
	ui_print("Verifying update package...\n");
	ui_show_progress(
	VERIFICATION_PROGRESS_FRACTION,
	VERIFICATION_PROGRESS_TIME);

	if (!verify_jar_signature(zip, keys, numKeys)) {
	LOGE("Verification failed\n");
	return INSTALL_CORRUPT;
	}

	// Update should take the rest of the progress bar.
	ui_print("Installing update...\n");

	int result = try_update_binary(path, zip);
	if (result == INSTALL_SUCCESS \|\| result == INSTALL_ERROR) {
	register_package_root(NULL, NULL); // Unregister package root
	return result;
	}

	// if INSTALL_CORRUPT is returned, this package doesn't have an
	// update binary. Fall back to the older mechanism of looking for
	// an update script.

	const ZipEntry *script_entry;
	script_entry = find_update_script(zip);
	if (script_entry == NULL) {
	LOGE("Can't find update script\n");
	return INSTALL_CORRUPT;
	}

	if (register_package_root(zip, path) < 0) {
	LOGE("Can't register package root\n");
	return INSTALL_ERROR;
	}

	int ret = handle_update_script(zip, script_entry);
	register_package_root(NULL, NULL); // Unregister package root
	return ret;
	}

	// Reads a file containing one or more public keys as produced by
	// DumpPublicKey: this is an RSAPublicKey struct as it would appear
	// as a C source literal, eg:
	//
	// "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
	//
	// (Note that the braces and commas in this example are actual
	// characters the parser expects to find in the file; the ellipses
	// indicate more numbers omitted from this example.)
	//
	// The file may contain multiple keys in this format, separated by
	// commas. The last key must not be followed by a comma.
	//
	// Returns NULL if the file failed to parse, or if it contain zero keys.
	static RSAPublicKey*
	load_keys(const char* filename, int* numKeys) {
	RSAPublicKey* out = NULL;
	*numKeys = 0;

	FILE* f = fopen(filename, "r");
	if (f == NULL) {
	LOGE("opening %s: %s\n", filename, strerror(errno));
	goto exit;
	}

	int i;
	bool done = false;
	while (!done) {
	++*numKeys;
	out = realloc(out, numKeys sizeof(RSAPublicKey));
	RSAPublicKey* key = out + (*numKeys - 1);
	if (fscanf(f, " { %i , %i , { %i",
	&(key->len), &(key->n0inv), &(key->n[0])) != 3) {
	goto exit;
	}
	if (key->len != RSANUMWORDS) {
	LOGE("key length (%d) does not match expected size\n", key->len);
	goto exit;
	}
	for (i = 1; i < key->len; ++i) {
	if (fscanf(f, " , %i", &(key->n[i])) != 1) goto exit;
	}
	if (fscanf(f, " } , { %i", &(key->rr[0])) != 1) goto exit;
	for (i = 1; i < key->len; ++i) {
	if (fscanf(f, " , %i", &(key->rr[i])) != 1) goto exit;
	}
	fscanf(f, " } } ");

	// if the line ends in a comma, this file has more keys.
	switch (fgetc(f)) {
	case ',':
	// more keys to come.
	break;

	case EOF:
	done = true;
	break;

	default:
	LOGE("unexpected character between keys\n");
	goto exit;
	}
	}

	fclose(f);
	return out;

	exit:
	if (f) fclose(f);
	free(out);
	*numKeys = 0;
	return NULL;
	}

	int
	install_package(const char *root_path)
	{
	ui_set_background(BACKGROUND_ICON_INSTALLING);
	ui_print("Finding update package...\n");
	ui_show_indeterminate_progress();
	LOGI("Update location: %s\n", root_path);

	if (ensure_root_path_mounted(root_path) != 0) {
	LOGE("Can't mount %s\n", root_path);
	return INSTALL_CORRUPT;
	}

	char path[PATH_MAX] = "";
	if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
	LOGE("Bad path %s\n", root_path);
	return INSTALL_CORRUPT;
	}

	ui_print("Opening update package...\n");
	LOGI("Update file path: %s\n", path);

	int numKeys;
	RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
	if (loadedKeys == NULL) {
	LOGE("Failed to load keys\n");
	return INSTALL_CORRUPT;
	}
	LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);

	/* Try to open the package.
	*/
	ZipArchive zip;
	int err = mzOpenZipArchive(path, &zip);
	if (err != 0) {
	LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
	return INSTALL_CORRUPT;
	}

	/* Verify and install the contents of the package.
	*/
	int status = handle_update_package(path, &zip, loadedKeys, numKeys);
	mzCloseZipArchive(&zip);
	free(loadedKeys);
	return status;
	}