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
main(int argc,char ** argv)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