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
main(int argc,char ** argv)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