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. The log file makes more sense if buffering is
40 // turned off so things appear in the right order.
41 setbuf(stdout, NULL);
42 setbuf(stderr, NULL);
43
44 if (argc != 4) {
45 fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
46 return 1;
47 }
48
49 char* version = argv[1];
50 if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
51 version[1] != '\0') {
52 // We support version 1, 2, or 3.
53 fprintf(stderr, "wrong updater binary API; expected 1, 2, or 3; "
54 "got %s\n",
55 argv[1]);
56 return 2;
57 }
58
59 // Set up the pipe for sending commands back to the parent process.
60
61 int fd = atoi(argv[2]);
62 FILE* cmd_pipe = fdopen(fd, "wb");
63 setlinebuf(cmd_pipe);
64
65 // Extract the script from the package.
66
67 char* package_data = argv[3];
68 ZipArchive za;
69 int err;
70 err = mzOpenZipArchive(package_data, &za);
71 if (err != 0) {
72 fprintf(stderr, "failed to open package %s: %s\n",
73 package_data, strerror(err));
74 return 3;
75 }
76
77 const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
78 if (script_entry == NULL) {
79 fprintf(stderr, "failed to find %s in %s\n", SCRIPT_NAME, package_data);
80 return 4;
81 }
82
83 char* script = malloc(script_entry->uncompLen+1);
84 if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
85 fprintf(stderr, "failed to read script from package\n");
86 return 5;
87 }
88 script[script_entry->uncompLen] = '\0';
89
90 // Configure edify's functions.
91
92 RegisterBuiltins();
93 RegisterInstallFunctions();
94 RegisterDeviceExtensions();
95 FinishRegistration();
96
97 // Parse the script.
98
99 Expr* root;
100 int error_count = 0;
101 yy_scan_string(script);
102 int error = yyparse(&root, &error_count);
103 if (error != 0 || error_count > 0) {
104 fprintf(stderr, "%d parse errors\n", error_count);
105 return 6;
106 }
107
108 #ifdef HAVE_SELINUX
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(stderr, "Warning: No file_contexts\n");
117 fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
118 }
119 #endif
120
121 // Evaluate the parsed script.
122
123 UpdaterInfo updater_info;
124 updater_info.cmd_pipe = cmd_pipe;
125 updater_info.package_zip = &za;
126 updater_info.version = atoi(version);
127
128 State state;
129 state.cookie = &updater_info;
130 state.script = script;
131 state.errmsg = NULL;
132
133 char* result = Evaluate(&state, root);
134 if (result == NULL) {
135 if (state.errmsg == NULL) {
136 fprintf(stderr, "script aborted (no error message)\n");
137 fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
138 } else {
139 fprintf(stderr, "script aborted: %s\n", state.errmsg);
140 char* line = strtok(state.errmsg, "\n");
141 while (line) {
142 fprintf(cmd_pipe, "ui_print %s\n", line);
143 line = strtok(NULL, "\n");
144 }
145 fprintf(cmd_pipe, "ui_print\n");
146 }
147 free(state.errmsg);
148 return 7;
149 } else {
150 fprintf(stderr, "script result was [%s]\n", result);
151 free(result);
152 }
153
154 if (updater_info.package_zip) {
155 mzCloseZipArchive(updater_info.package_zip);
156 }
157 free(script);
158
159 return 0;
160 }
161