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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 struct selabel_handle *sehandle;
     36 
     37 int main(int argc, char** argv) {
     38     // Various things log information to stdout or stderr more or less
     39     // at random.  The log file makes more sense if buffering is
     40     // turned off so things appear in the right order.
     41     setbuf(stdout, NULL);
     42     setbuf(stderr, NULL);
     43 
     44     if (argc != 4) {
     45         fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
     46         return 1;
     47     }
     48 
     49     char* version = argv[1];
     50     if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
     51         version[1] != '\0') {
     52         // We support version 1, 2, or 3.
     53         fprintf(stderr, "wrong updater binary API; expected 1, 2, or 3; "
     54                         "got %s\n",
     55                 argv[1]);
     56         return 2;
     57     }
     58 
     59     // Set up the pipe for sending commands back to the parent process.
     60 
     61     int fd = atoi(argv[2]);
     62     FILE* cmd_pipe = fdopen(fd, "wb");
     63     setlinebuf(cmd_pipe);
     64 
     65     // Extract the script from the package.
     66 
     67     char* package_data = argv[3];
     68     ZipArchive za;
     69     int err;
     70     err = mzOpenZipArchive(package_data, &za);
     71     if (err != 0) {
     72         fprintf(stderr, "failed to open package %s: %s\n",
     73                 package_data, strerror(err));
     74         return 3;
     75     }
     76 
     77     const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
     78     if (script_entry == NULL) {
     79         fprintf(stderr, "failed to find %s in %s\n", SCRIPT_NAME, package_data);
     80         return 4;
     81     }
     82 
     83     char* script = malloc(script_entry->uncompLen+1);
     84     if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
     85         fprintf(stderr, "failed to read script from package\n");
     86         return 5;
     87     }
     88     script[script_entry->uncompLen] = '\0';
     89 
     90     // Configure edify's functions.
     91 
     92     RegisterBuiltins();
     93     RegisterInstallFunctions();
     94     RegisterDeviceExtensions();
     95     FinishRegistration();
     96 
     97     // Parse the script.
     98 
     99     Expr* root;
    100     int error_count = 0;
    101     yy_scan_string(script);
    102     int error = yyparse(&root, &error_count);
    103     if (error != 0 || error_count > 0) {
    104         fprintf(stderr, "%d parse errors\n", error_count);
    105         return 6;
    106     }
    107 
    108 #ifdef HAVE_SELINUX
    109     struct selinux_opt seopts[] = {
    110       { SELABEL_OPT_PATH, "/file_contexts" }
    111     };
    112 
    113     sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
    114 
    115     if (!sehandle) {
    116         fprintf(stderr, "Warning:  No file_contexts\n");
    117         fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
    118     }
    119 #endif
    120 
    121     // Evaluate the parsed script.
    122 
    123     UpdaterInfo updater_info;
    124     updater_info.cmd_pipe = cmd_pipe;
    125     updater_info.package_zip = &za;
    126     updater_info.version = atoi(version);
    127 
    128     State state;
    129     state.cookie = &updater_info;
    130     state.script = script;
    131     state.errmsg = NULL;
    132 
    133     char* result = Evaluate(&state, root);
    134     if (result == NULL) {
    135         if (state.errmsg == NULL) {
    136             fprintf(stderr, "script aborted (no error message)\n");
    137             fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
    138         } else {
    139             fprintf(stderr, "script aborted: %s\n", state.errmsg);
    140             char* line = strtok(state.errmsg, "\n");
    141             while (line) {
    142                 fprintf(cmd_pipe, "ui_print %s\n", line);
    143                 line = strtok(NULL, "\n");
    144             }
    145             fprintf(cmd_pipe, "ui_print\n");
    146         }
    147         free(state.errmsg);
    148         return 7;
    149     } else {
    150         fprintf(stderr, "script result was [%s]\n", result);
    151         free(result);
    152     }
    153 
    154     if (updater_info.package_zip) {
    155         mzCloseZipArchive(updater_info.package_zip);
    156     }
    157     free(script);
    158 
    159     return 0;
    160 }
    161