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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <unistd.h>
     18 #include <dirent.h>
     19 #include <errno.h>
     20 #include <stdlib.h>
     21 #include <string.h>
     22 #include <sys/types.h>
     23 #include <sys/wait.h>
     24 #include <sys/stat.h>
     25 #include <signal.h>
     26 #include <fcntl.h>
     27 
     28 #include "ui.h"
     29 #include "cutils/properties.h"
     30 #include "install.h"
     31 #include "common.h"
     32 #include "adb_install.h"
     33 #include "minadbd/fuse_adb_provider.h"
     34 #include "fuse_sideload.h"
     35 
     36 static RecoveryUI* ui = NULL;
     37 
     38 static void
     39 set_usb_driver(bool enabled) {
     40     int fd = open("/sys/class/android_usb/android0/enable", O_WRONLY);
     41     if (fd < 0) {
     42         ui->Print("failed to open driver control: %s\n", strerror(errno));
     43         return;
     44     }
     45     if (TEMP_FAILURE_RETRY(write(fd, enabled ? "1" : "0", 1)) == -1) {
     46         ui->Print("failed to set driver control: %s\n", strerror(errno));
     47     }
     48     if (close(fd) < 0) {
     49         ui->Print("failed to close driver control: %s\n", strerror(errno));
     50     }
     51 }
     52 
     53 static void
     54 stop_adbd() {
     55     property_set("ctl.stop", "adbd");
     56     set_usb_driver(false);
     57 }
     58 
     59 
     60 static void
     61 maybe_restart_adbd() {
     62     if (is_ro_debuggable()) {
     63         ui->Print("Restarting adbd...\n");
     64         set_usb_driver(true);
     65         property_set("ctl.start", "adbd");
     66     }
     67 }
     68 
     69 // How long (in seconds) we wait for the host to start sending us a
     70 // package, before timing out.
     71 #define ADB_INSTALL_TIMEOUT 300
     72 
     73 int
     74 apply_from_adb(RecoveryUI* ui_, bool* wipe_cache, const char* install_file) {
     75     modified_flash = true;
     76 
     77     ui = ui_;
     78 
     79     stop_adbd();
     80     set_usb_driver(true);
     81 
     82     ui->Print("\n\nNow send the package you want to apply\n"
     83               "to the device with \"adb sideload <filename>\"...\n");
     84 
     85     pid_t child;
     86     if ((child = fork()) == 0) {
     87         execl("/sbin/recovery", "recovery", "--adbd", NULL);
     88         _exit(-1);
     89     }
     90 
     91     // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the host
     92     // connects and starts serving a package.  Poll for its
     93     // appearance.  (Note that inotify doesn't work with FUSE.)
     94     int result = INSTALL_ERROR;
     95     int status;
     96     bool waited = false;
     97     struct stat st;
     98     for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) {
     99         if (waitpid(child, &status, WNOHANG) != 0) {
    100             result = INSTALL_ERROR;
    101             waited = true;
    102             break;
    103         }
    104 
    105         if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &st) != 0) {
    106             if (errno == ENOENT && i < ADB_INSTALL_TIMEOUT-1) {
    107                 sleep(1);
    108                 continue;
    109             } else {
    110                 ui->Print("\nTimed out waiting for package.\n\n");
    111                 result = INSTALL_ERROR;
    112                 kill(child, SIGKILL);
    113                 break;
    114             }
    115         }
    116         result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, install_file, false, 0);
    117         break;
    118     }
    119 
    120     if (!waited) {
    121         // Calling stat() on this magic filename signals the minadbd
    122         // subprocess to shut down.
    123         stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st);
    124 
    125         // TODO(dougz): there should be a way to cancel waiting for a
    126         // package (by pushing some button combo on the device).  For now
    127         // you just have to 'adb sideload' a file that's not a valid
    128         // package, like "/dev/null".
    129         waitpid(child, &status, 0);
    130     }
    131 
    132     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
    133         if (WEXITSTATUS(status) == 3) {
    134             ui->Print("\nYou need adb 1.0.32 or newer to sideload\nto this device.\n\n");
    135         } else if (!WIFSIGNALED(status)) {
    136             ui->Print("\n(adbd status %d)\n", WEXITSTATUS(status));
    137         }
    138     }
    139 
    140     set_usb_driver(false);
    141     maybe_restart_adbd();
    142 
    143     return result;
    144 }
    145