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 #include <string.h>
21
22 #include "edify/expr.h"
23 #include "updater.h"
24 #include "install.h"
25 #include "blockimg.h"
26 #include "minzip/Zip.h"
27 #include "minzip/SysUtil.h"
28 #include "config.h"
29
30 // Generated by the makefile, this function defines the
31 // RegisterDeviceExtensions() function, which calls all the
32 // registration functions for device-specific extensions.
33 #include "register.inc"
34
35 // Where in the package we expect to find the edify script to execute.
36 // (Note it's "updateR-script", not the older "update-script".)
37 #define SCRIPT_NAME "META-INF/com/google/android/updater-script"
38
39 extern bool have_eio_error;
40
41 struct selabel_handle *sehandle;
42
main(int argc,char ** argv)43 int main(int argc, char** argv) {
44 // Various things log information to stdout or stderr more or less
45 // at random (though we've tried to standardize on stdout). The
46 // log file makes more sense if buffering is turned off so things
47 // appear in the right order.
48 setbuf(stdout, NULL);
49 setbuf(stderr, NULL);
50
51 if (argc != 4 && argc != 5) {
52 printf("unexpected number of arguments (%d)\n", argc);
53 return 1;
54 }
55
56 char* version = argv[1];
57 if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
58 version[1] != '\0') {
59 // We support version 1, 2, or 3.
60 printf("wrong updater binary API; expected 1, 2, or 3; "
61 "got %s\n",
62 argv[1]);
63 return 2;
64 }
65
66 // Set up the pipe for sending commands back to the parent process.
67
68 int fd = atoi(argv[2]);
69 FILE* cmd_pipe = fdopen(fd, "wb");
70 setlinebuf(cmd_pipe);
71
72 // Extract the script from the package.
73
74 const char* package_filename = argv[3];
75 MemMapping map;
76 if (sysMapFile(package_filename, &map) != 0) {
77 printf("failed to map package %s\n", argv[3]);
78 return 3;
79 }
80 ZipArchive za;
81 int err;
82 err = mzOpenZipArchive(map.addr, map.length, &za);
83 if (err != 0) {
84 printf("failed to open package %s: %s\n",
85 argv[3], strerror(err));
86 return 3;
87 }
88 ota_io_init(&za);
89
90 const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
91 if (script_entry == NULL) {
92 printf("failed to find %s in %s\n", SCRIPT_NAME, package_filename);
93 return 4;
94 }
95
96 char* script = reinterpret_cast<char*>(malloc(script_entry->uncompLen+1));
97 if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
98 printf("failed to read script from package\n");
99 return 5;
100 }
101 script[script_entry->uncompLen] = '\0';
102
103 // Configure edify's functions.
104
105 RegisterBuiltins();
106 RegisterInstallFunctions();
107 RegisterBlockImageFunctions();
108 RegisterDeviceExtensions();
109 FinishRegistration();
110
111 // Parse the script.
112
113 Expr* root;
114 int error_count = 0;
115 int error = parse_string(script, &root, &error_count);
116 if (error != 0 || error_count > 0) {
117 printf("%d parse errors\n", error_count);
118 return 6;
119 }
120
121 struct selinux_opt seopts[] = {
122 { SELABEL_OPT_PATH, "/file_contexts" }
123 };
124
125 sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
126
127 if (!sehandle) {
128 fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
129 }
130
131 // Evaluate the parsed script.
132
133 UpdaterInfo updater_info;
134 updater_info.cmd_pipe = cmd_pipe;
135 updater_info.package_zip = &za;
136 updater_info.version = atoi(version);
137 updater_info.package_zip_addr = map.addr;
138 updater_info.package_zip_len = map.length;
139
140 State state;
141 state.cookie = &updater_info;
142 state.script = script;
143 state.errmsg = NULL;
144
145 if (argc == 5) {
146 if (strcmp(argv[4], "retry") == 0) {
147 state.is_retry = true;
148 } else {
149 printf("unexpected argument: %s", argv[4]);
150 }
151 }
152
153 char* result = Evaluate(&state, root);
154
155 if (have_eio_error) {
156 fprintf(cmd_pipe, "retry_update\n");
157 }
158
159 if (result == NULL) {
160 if (state.errmsg == NULL) {
161 printf("script aborted (no error message)\n");
162 fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
163 } else {
164 printf("script aborted: %s\n", state.errmsg);
165 char* line = strtok(state.errmsg, "\n");
166 while (line) {
167 // Parse the error code in abort message.
168 // Example: "E30: This package is for bullhead devices."
169 if (*line == 'E') {
170 if (sscanf(line, "E%u: ", &state.error_code) != 1) {
171 printf("Failed to parse error code: [%s]\n", line);
172 }
173 }
174 fprintf(cmd_pipe, "ui_print %s\n", line);
175 line = strtok(NULL, "\n");
176 }
177 fprintf(cmd_pipe, "ui_print\n");
178 }
179
180 if (state.error_code != kNoError) {
181 fprintf(cmd_pipe, "log error: %d\n", state.error_code);
182 // Cause code should provide additional information about the abort;
183 // report only when an error exists.
184 if (state.cause_code != kNoCause) {
185 fprintf(cmd_pipe, "log cause: %d\n", state.cause_code);
186 }
187 }
188
189 free(state.errmsg);
190 return 7;
191 } else {
192 fprintf(cmd_pipe, "ui_print script succeeded: result was [%s]\n", result);
193 free(result);
194 }
195
196 if (updater_info.package_zip) {
197 mzCloseZipArchive(updater_info.package_zip);
198 }
199 sysReleaseMap(&map);
200 free(script);
201
202 return 0;
203 }
204