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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 "blockimg.h"
     25 #include "minzip/Zip.h"
     26 #include "minzip/SysUtil.h"
     27 
     28 // Generated by the makefile, this function defines the
     29 // RegisterDeviceExtensions() function, which calls all the
     30 // registration functions for device-specific extensions.
     31 #include "register.inc"
     32 
     33 // Where in the package we expect to find the edify script to execute.
     34 // (Note it's "updateR-script", not the older "update-script".)
     35 #define SCRIPT_NAME "META-INF/com/google/android/updater-script"
     36 
     37 struct selabel_handle *sehandle;
     38 
     39 int main(int argc, char** argv) {
     40     // Various things log information to stdout or stderr more or less
     41     // at random (though we've tried to standardize on stdout).  The
     42     // log file makes more sense if buffering is turned off so things
     43     // appear in the right order.
     44     setbuf(stdout, NULL);
     45     setbuf(stderr, NULL);
     46 
     47     if (argc != 4) {
     48         printf("unexpected number of arguments (%d)\n", argc);
     49         return 1;
     50     }
     51 
     52     char* version = argv[1];
     53     if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
     54         version[1] != '\0') {
     55         // We support version 1, 2, or 3.
     56         printf("wrong updater binary API; expected 1, 2, or 3; "
     57                         "got %s\n",
     58                 argv[1]);
     59         return 2;
     60     }
     61 
     62     // Set up the pipe for sending commands back to the parent process.
     63 
     64     int fd = atoi(argv[2]);
     65     FILE* cmd_pipe = fdopen(fd, "wb");
     66     setlinebuf(cmd_pipe);
     67 
     68     // Extract the script from the package.
     69 
     70     const char* package_filename = argv[3];
     71     MemMapping map;
     72     if (sysMapFile(package_filename, &map) != 0) {
     73         printf("failed to map package %s\n", argv[3]);
     74         return 3;
     75     }
     76     ZipArchive za;
     77     int err;
     78     err = mzOpenZipArchive(map.addr, map.length, &za);
     79     if (err != 0) {
     80         printf("failed to open package %s: %s\n",
     81                argv[3], strerror(err));
     82         return 3;
     83     }
     84 
     85     const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
     86     if (script_entry == NULL) {
     87         printf("failed to find %s in %s\n", SCRIPT_NAME, package_filename);
     88         return 4;
     89     }
     90 
     91     char* script = malloc(script_entry->uncompLen+1);
     92     if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
     93         printf("failed to read script from package\n");
     94         return 5;
     95     }
     96     script[script_entry->uncompLen] = '\0';
     97 
     98     // Configure edify's functions.
     99 
    100     RegisterBuiltins();
    101     RegisterInstallFunctions();
    102     RegisterBlockImageFunctions();
    103     RegisterDeviceExtensions();
    104     FinishRegistration();
    105 
    106     // Parse the script.
    107 
    108     Expr* root;
    109     int error_count = 0;
    110     int error = parse_string(script, &root, &error_count);
    111     if (error != 0 || error_count > 0) {
    112         printf("%d parse errors\n", error_count);
    113         return 6;
    114     }
    115 
    116     struct selinux_opt seopts[] = {
    117       { SELABEL_OPT_PATH, "/file_contexts" }
    118     };
    119 
    120     sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
    121 
    122     if (!sehandle) {
    123         fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
    124     }
    125 
    126     // Evaluate the parsed script.
    127 
    128     UpdaterInfo updater_info;
    129     updater_info.cmd_pipe = cmd_pipe;
    130     updater_info.package_zip = &za;
    131     updater_info.version = atoi(version);
    132     updater_info.package_zip_addr = map.addr;
    133     updater_info.package_zip_len = map.length;
    134 
    135     State state;
    136     state.cookie = &updater_info;
    137     state.script = script;
    138     state.errmsg = NULL;
    139 
    140     char* result = Evaluate(&state, root);
    141     if (result == NULL) {
    142         if (state.errmsg == NULL) {
    143             printf("script aborted (no error message)\n");
    144             fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
    145         } else {
    146             printf("script aborted: %s\n", state.errmsg);
    147             char* line = strtok(state.errmsg, "\n");
    148             while (line) {
    149                 fprintf(cmd_pipe, "ui_print %s\n", line);
    150                 line = strtok(NULL, "\n");
    151             }
    152             fprintf(cmd_pipe, "ui_print\n");
    153         }
    154         free(state.errmsg);
    155         return 7;
    156     } else {
    157         fprintf(cmd_pipe, "ui_print script succeeded: result was [%s]\n", result);
    158         free(result);
    159     }
    160 
    161     if (updater_info.package_zip) {
    162         mzCloseZipArchive(updater_info.package_zip);
    163     }
    164     sysReleaseMap(&map);
    165     free(script);
    166 
    167     return 0;
    168 }
    169