1
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <string.h>
6 #include <ctype.h>
7
8 #include <sys/types.h>
9 #include <sys/stat.h>
10 #include <dirent.h>
11
12 #include <stdarg.h>
13 #include <fcntl.h>
14
15 #include <private/android_filesystem_config.h>
16
17 /* NOTES
18 **
19 ** - see buffer-format.txt from the linux kernel docs for
20 ** an explanation of this file format
21 ** - dotfiles are ignored
22 ** - directories named 'root' are ignored
23 ** - device notes, pipes, etc are not supported (error)
24 */
25
die(const char * why,...)26 void die(const char *why, ...)
27 {
28 va_list ap;
29
30 va_start(ap, why);
31 fprintf(stderr,"error: ");
32 vfprintf(stderr, why, ap);
33 fprintf(stderr,"\n");
34 va_end(ap);
35 exit(1);
36 }
37
38 struct fs_config_entry {
39 char* name;
40 int uid, gid, mode;
41 };
42
43 static struct fs_config_entry* canned_config = NULL;
44 static char *target_out_path = NULL;
45
46 /* Each line in the canned file should be a path plus three ints (uid,
47 * gid, mode). */
48 #ifdef PATH_MAX
49 #define CANNED_LINE_LENGTH (PATH_MAX+100)
50 #else
51 #define CANNED_LINE_LENGTH (1024)
52 #endif
53
54 static int verbose = 0;
55 static int total_size = 0;
56
fix_stat(const char * path,struct stat * s)57 static void fix_stat(const char *path, struct stat *s)
58 {
59 uint64_t capabilities;
60 if (canned_config) {
61 // Use the list of file uid/gid/modes loaded from the file
62 // given with -f.
63
64 struct fs_config_entry* empty_path_config = NULL;
65 struct fs_config_entry* p;
66 for (p = canned_config; p->name; ++p) {
67 if (!p->name[0]) {
68 empty_path_config = p;
69 }
70 if (strcmp(p->name, path) == 0) {
71 s->st_uid = p->uid;
72 s->st_gid = p->gid;
73 s->st_mode = p->mode | (s->st_mode & ~07777);
74 return;
75 }
76 }
77 s->st_uid = empty_path_config->uid;
78 s->st_gid = empty_path_config->gid;
79 s->st_mode = empty_path_config->mode | (s->st_mode & ~07777);
80 } else {
81 // Use the compiled-in fs_config() function.
82 unsigned st_mode = s->st_mode;
83 fs_config(path, S_ISDIR(s->st_mode), target_out_path,
84 &s->st_uid, &s->st_gid, &st_mode, &capabilities);
85 s->st_mode = (typeof(s->st_mode)) st_mode;
86 }
87 }
88
_eject(struct stat * s,char * out,int olen,char * data,unsigned datasize)89 static void _eject(struct stat *s, char *out, int olen, char *data, unsigned datasize)
90 {
91 // Nothing is special about this value, just picked something in the
92 // approximate range that was being used already, and avoiding small
93 // values which may be special.
94 static unsigned next_inode = 300000;
95
96 while(total_size & 3) {
97 total_size++;
98 putchar(0);
99 }
100
101 fix_stat(out, s);
102 // fprintf(stderr, "_eject %s: mode=0%o\n", out, s->st_mode);
103
104 printf("%06x%08x%08x%08x%08x%08x%08x"
105 "%08x%08x%08x%08x%08x%08x%08x%s%c",
106 0x070701,
107 next_inode++, // s.st_ino,
108 s->st_mode,
109 0, // s.st_uid,
110 0, // s.st_gid,
111 1, // s.st_nlink,
112 0, // s.st_mtime,
113 datasize,
114 0, // volmajor
115 0, // volminor
116 0, // devmajor
117 0, // devminor,
118 olen + 1,
119 0,
120 out,
121 0
122 );
123
124 total_size += 6 + 8*13 + olen + 1;
125
126 if(strlen(out) != (unsigned int)olen) die("ACK!");
127
128 while(total_size & 3) {
129 total_size++;
130 putchar(0);
131 }
132
133 if(datasize) {
134 fwrite(data, datasize, 1, stdout);
135 total_size += datasize;
136 }
137 }
138
_eject_trailer()139 static void _eject_trailer()
140 {
141 struct stat s;
142 memset(&s, 0, sizeof(s));
143 _eject(&s, "TRAILER!!!", 10, 0, 0);
144
145 while(total_size & 0xff) {
146 total_size++;
147 putchar(0);
148 }
149 }
150
151 static void _archive(char *in, char *out, int ilen, int olen);
152
compare(const void * a,const void * b)153 static int compare(const void* a, const void* b) {
154 return strcmp(*(const char**)a, *(const char**)b);
155 }
156
_archive_dir(char * in,char * out,int ilen,int olen)157 static void _archive_dir(char *in, char *out, int ilen, int olen)
158 {
159 int i, t;
160 DIR *d;
161 struct dirent *de;
162
163 if(verbose) {
164 fprintf(stderr,"_archive_dir('%s','%s',%d,%d)\n",
165 in, out, ilen, olen);
166 }
167
168 d = opendir(in);
169 if(d == 0) die("cannot open directory '%s'", in);
170
171 int size = 32;
172 int entries = 0;
173 char** names = malloc(size * sizeof(char*));
174 if (names == NULL) {
175 fprintf(stderr, "failed to allocate dir names array (size %d)\n", size);
176 exit(1);
177 }
178
179 while((de = readdir(d)) != 0){
180 /* xxx: feature? maybe some dotfiles are okay */
181 if(de->d_name[0] == '.') continue;
182
183 /* xxx: hack. use a real exclude list */
184 if(!strcmp(de->d_name, "root")) continue;
185
186 if (entries >= size) {
187 size *= 2;
188 names = realloc(names, size * sizeof(char*));
189 if (names == NULL) {
190 fprintf(stderr, "failed to reallocate dir names array (size %d)\n",
191 size);
192 exit(1);
193 }
194 }
195 names[entries] = strdup(de->d_name);
196 if (names[entries] == NULL) {
197 fprintf(stderr, "failed to strdup name \"%s\"\n",
198 de->d_name);
199 exit(1);
200 }
201 ++entries;
202 }
203
204 qsort(names, entries, sizeof(char*), compare);
205
206 for (i = 0; i < entries; ++i) {
207 t = strlen(names[i]);
208 in[ilen] = '/';
209 memcpy(in + ilen + 1, names[i], t + 1);
210
211 if(olen > 0) {
212 out[olen] = '/';
213 memcpy(out + olen + 1, names[i], t + 1);
214 _archive(in, out, ilen + t + 1, olen + t + 1);
215 } else {
216 memcpy(out, names[i], t + 1);
217 _archive(in, out, ilen + t + 1, t);
218 }
219
220 in[ilen] = 0;
221 out[olen] = 0;
222
223 free(names[i]);
224 }
225 free(names);
226
227 closedir(d);
228 }
229
_archive(char * in,char * out,int ilen,int olen)230 static void _archive(char *in, char *out, int ilen, int olen)
231 {
232 struct stat s;
233
234 if(verbose) {
235 fprintf(stderr,"_archive('%s','%s',%d,%d)\n",
236 in, out, ilen, olen);
237 }
238
239 if(lstat(in, &s)) die("could not stat '%s'\n", in);
240
241 if(S_ISREG(s.st_mode)){
242 char *tmp;
243 int fd;
244
245 fd = open(in, O_RDONLY);
246 if(fd < 0) die("cannot open '%s' for read", in);
247
248 tmp = (char*) malloc(s.st_size);
249 if(tmp == 0) die("cannot allocate %d bytes", s.st_size);
250
251 if(read(fd, tmp, s.st_size) != s.st_size) {
252 die("cannot read %d bytes", s.st_size);
253 }
254
255 _eject(&s, out, olen, tmp, s.st_size);
256
257 free(tmp);
258 close(fd);
259 } else if(S_ISDIR(s.st_mode)) {
260 _eject(&s, out, olen, 0, 0);
261 _archive_dir(in, out, ilen, olen);
262 } else if(S_ISLNK(s.st_mode)) {
263 char buf[1024];
264 int size;
265 size = readlink(in, buf, 1024);
266 if(size < 0) die("cannot read symlink '%s'", in);
267 _eject(&s, out, olen, buf, size);
268 } else {
269 die("Unknown '%s' (mode %d)?\n", in, s.st_mode);
270 }
271 }
272
archive(const char * start,const char * prefix)273 void archive(const char *start, const char *prefix)
274 {
275 char in[8192];
276 char out[8192];
277
278 strcpy(in, start);
279 strcpy(out, prefix);
280
281 _archive_dir(in, out, strlen(in), strlen(out));
282 }
283
read_canned_config(char * filename)284 static void read_canned_config(char* filename)
285 {
286 int allocated = 8;
287 int used = 0;
288
289 canned_config =
290 (struct fs_config_entry*)malloc(allocated * sizeof(struct fs_config_entry));
291
292 char line[CANNED_LINE_LENGTH];
293 FILE* f = fopen(filename, "r");
294 if (f == NULL) die("failed to open canned file");
295
296 while (fgets(line, CANNED_LINE_LENGTH, f) != NULL) {
297 if (!line[0]) break;
298 if (used >= allocated) {
299 allocated *= 2;
300 canned_config = (struct fs_config_entry*)realloc(
301 canned_config, allocated * sizeof(struct fs_config_entry));
302 }
303
304 struct fs_config_entry* cc = canned_config + used;
305
306 if (isspace(line[0])) {
307 cc->name = strdup("");
308 cc->uid = atoi(strtok(line, " \n"));
309 } else {
310 cc->name = strdup(strtok(line, " \n"));
311 cc->uid = atoi(strtok(NULL, " \n"));
312 }
313 cc->gid = atoi(strtok(NULL, " \n"));
314 cc->mode = strtol(strtok(NULL, " \n"), NULL, 8);
315 ++used;
316 }
317 if (used >= allocated) {
318 ++allocated;
319 canned_config = (struct fs_config_entry*)realloc(
320 canned_config, allocated * sizeof(struct fs_config_entry));
321 }
322 canned_config[used].name = NULL;
323
324 fclose(f);
325 }
326
327
main(int argc,char * argv[])328 int main(int argc, char *argv[])
329 {
330 argc--;
331 argv++;
332
333 if (argc > 1 && strcmp(argv[0], "-d") == 0) {
334 target_out_path = argv[1];
335 argc -= 2;
336 argv += 2;
337 }
338
339 if (argc > 1 && strcmp(argv[0], "-f") == 0) {
340 read_canned_config(argv[1]);
341 argc -= 2;
342 argv += 2;
343 }
344
345 if(argc == 0) die("no directories to process?!");
346
347 while(argc-- > 0){
348 char *x = strchr(*argv, '=');
349 if(x != 0) {
350 *x++ = 0;
351 } else {
352 x = "";
353 }
354
355 archive(*argv, x);
356
357 argv++;
358 }
359
360 _eject_trailer();
361
362 return 0;
363 }
364