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      1 /*
      2  * Copyright (C) 2009 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 <stdio.h>
     18 #include <unistd.h>
     19 #include <stdlib.h>
     20 
     21 #include "edify/expr.h"
     22 #include "updater.h"
     23 #include "install.h"
     24 #include "minzip/Zip.h"
     25 
     26 // Generated by the makefile, this function defines the
     27 // RegisterDeviceExtensions() function, which calls all the
     28 // registration functions for device-specific extensions.
     29 #include "register.inc"
     30 
     31 // Where in the package we expect to find the edify script to execute.
     32 // (Note it's "updateR-script", not the older "update-script".)
     33 #define SCRIPT_NAME "META-INF/com/google/android/updater-script"
     34 
     35 int main(int argc, char** argv) {
     36     // Various things log information to stdout or stderr more or less
     37     // at random.  The log file makes more sense if buffering is
     38     // turned off so things appear in the right order.
     39     setbuf(stdout, NULL);
     40     setbuf(stderr, NULL);
     41 
     42     if (argc != 4) {
     43         fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
     44         return 1;
     45     }
     46 
     47     char* version = argv[1];
     48     if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
     49         version[1] != '\0') {
     50         // We support version 1, 2, or 3.
     51         fprintf(stderr, "wrong updater binary API; expected 1, 2, or 3; "
     52                         "got %s\n",
     53                 argv[1]);
     54         return 2;
     55     }
     56 
     57     // Set up the pipe for sending commands back to the parent process.
     58 
     59     int fd = atoi(argv[2]);
     60     FILE* cmd_pipe = fdopen(fd, "wb");
     61     setlinebuf(cmd_pipe);
     62 
     63     // Extract the script from the package.
     64 
     65     char* package_data = argv[3];
     66     ZipArchive za;
     67     int err;
     68     err = mzOpenZipArchive(package_data, &za);
     69     if (err != 0) {
     70         fprintf(stderr, "failed to open package %s: %s\n",
     71                 package_data, strerror(err));
     72         return 3;
     73     }
     74 
     75     const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
     76     if (script_entry == NULL) {
     77         fprintf(stderr, "failed to find %s in %s\n", SCRIPT_NAME, package_data);
     78         return 4;
     79     }
     80 
     81     char* script = malloc(script_entry->uncompLen+1);
     82     if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
     83         fprintf(stderr, "failed to read script from package\n");
     84         return 5;
     85     }
     86     script[script_entry->uncompLen] = '\0';
     87 
     88     // Configure edify's functions.
     89 
     90     RegisterBuiltins();
     91     RegisterInstallFunctions();
     92     RegisterDeviceExtensions();
     93     FinishRegistration();
     94 
     95     // Parse the script.
     96 
     97     Expr* root;
     98     int error_count = 0;
     99     yy_scan_string(script);
    100     int error = yyparse(&root, &error_count);
    101     if (error != 0 || error_count > 0) {
    102         fprintf(stderr, "%d parse errors\n", error_count);
    103         return 6;
    104     }
    105 
    106     // Evaluate the parsed script.
    107 
    108     UpdaterInfo updater_info;
    109     updater_info.cmd_pipe = cmd_pipe;
    110     updater_info.package_zip = &za;
    111     updater_info.version = atoi(version);
    112 
    113     State state;
    114     state.cookie = &updater_info;
    115     state.script = script;
    116     state.errmsg = NULL;
    117 
    118     char* result = Evaluate(&state, root);
    119     if (result == NULL) {
    120         if (state.errmsg == NULL) {
    121             fprintf(stderr, "script aborted (no error message)\n");
    122             fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
    123         } else {
    124             fprintf(stderr, "script aborted: %s\n", state.errmsg);
    125             char* line = strtok(state.errmsg, "\n");
    126             while (line) {
    127                 fprintf(cmd_pipe, "ui_print %s\n", line);
    128                 line = strtok(NULL, "\n");
    129             }
    130             fprintf(cmd_pipe, "ui_print\n");
    131         }
    132         free(state.errmsg);
    133         return 7;
    134     } else {
    135         fprintf(stderr, "script result was [%s]\n", result);
    136         free(result);
    137     }
    138 
    139     if (updater_info.package_zip) {
    140         mzCloseZipArchive(updater_info.package_zip);
    141     }
    142     free(script);
    143 
    144     return 0;
    145 }
    146