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