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
35struct selabel_handle *sehandle;
36
37int 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