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