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/*
* Copyright (c) 2016 Apple Inc. All rights reserved.
*/
#include "options.h"
#include "dyld_shared_cache.h"
#include "utils.h"
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <fts.h>
#include <fcntl.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <TargetConditionals.h>
static const size_t dyld_cache_header_size = sizeof (struct copied_dyld_cache_header);
/*
* The shared cache must both contain the magic ID and
* match the uuid we discovered via dyld's information.
* Assumes that the dyld_cache_header grows in a binary compatible fashion.
*/
bool
get_uuid_from_shared_cache_mapping(const void *addr, size_t size, uuid_t out)
{
const struct copied_dyld_cache_header *ch = addr;
if (size < sizeof (*ch))
return false;
static const char prefix[] = "dyld_v";
if (strncmp(ch->magic, prefix, strlen(prefix)) != 0)
return false;
uuid_copy(out, ch->uuid);
return true;
}
/*
* Look in the known places to see if we can find this one ..
*/
char *
shared_cache_filename(const uuid_t uu)
{
assert(!uuid_is_null(uu));
static char *sc_argv[] = {
#if TARGET_OS_OSX
"/System/Library/dyld",
#elif TARGET_OS_IPHONE
"/System/Library/Caches/com.apple.dyld",
#else
#error undefined
#endif
NULL
};
char *nm = NULL;
FTS *fts = fts_open(sc_argv, FTS_NOCHDIR | FTS_LOGICAL | FTS_XDEV, NULL);
if (NULL != fts) {
FTSENT *fe;
while (NULL != (fe = fts_read(fts))) {
if ((fe->fts_info & FTS_F) == 0 ||
(fe->fts_info & FTS_ERR) != 0)
continue;
static const char prefix[] = "dyld_shared_cache_";
if (strncmp(fe->fts_name, prefix, strlen(prefix)) != 0)
continue;
if (fe->fts_statp->st_size < (off_t)dyld_cache_header_size)
continue;
int d = open(fe->fts_accpath, O_RDONLY);
if (-1 == d) {
if (OPTIONS_DEBUG(opt, 1))
printf("%s: cannot open - %s\n", fe->fts_accpath, strerror(errno));
continue;
}
void *addr = mmap(NULL, dyld_cache_header_size, PROT_READ, MAP_PRIVATE, d, 0);
close(d);
if ((void *)-1 == addr) {
if (OPTIONS_DEBUG(opt, 1))
printf("%s: cannot mmap - %s\n", fe->fts_accpath, strerror(errno));
continue;
}
uuid_t scuuid;
uuid_clear(scuuid);
if (get_uuid_from_shared_cache_mapping(addr, dyld_cache_header_size, scuuid)) {
if (uuid_compare(uu, scuuid) == 0)
nm = strdup(fe->fts_accpath);
else if (OPTIONS_DEBUG(opt, 3)) {
uuid_string_t scstr;
uuid_unparse_lower(scuuid, scstr);
printf("%s: shared cache mismatch (%s)\n", fe->fts_accpath, scstr);
}
}
munmap(addr, dyld_cache_header_size);
if (NULL != nm)
break;
}
}
if (fts)
fts_close(fts);
return nm;
}
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