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introduce safety limit on total number of items in bencoded trees in lazy_bdecode. Document lazy_bdecode and its error codes. Make dump_torrent able to change the decoding limits

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Arvid Norberg
2010-11-25 02:49:50 +00:00
parent 26a2beee5e
commit faccbd8ae3
7 changed files with 88 additions and 19 deletions
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17
examples/dump_torrent.cpp
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@@ -40,14 +40,18 @@ int main(int argc, char* argv[])
{
using namespace libtorrent;
printf("sizeof(file_entry): %d\n", int(sizeof(file_entry)));
if (argc != 2)
if (argc < 2 || argc > 4)
{
fputs("usage: dump_torrent torrent-file\n", stderr);
fputs("usage: dump_torrent torrent-file [total-items-limit] [recursion-limit]\n", stderr);
return 1;
}
int item_limit = 100000;
int depth_limit = 1000;
if (argc > 2) item_limit = atoi(argv[2]);
if (argc > 3) depth_limit = atoi(argv[3]);
int size = file_size(argv[1]);
if (size > 10 * 1000000)
{
@@ -64,7 +68,10 @@ int main(int argc, char* argv[])
lazy_entry e;
error_code ec;
int pos;
ret = lazy_bdecode(&buf[0], &buf[0] + buf.size(), e, ec, &pos);
printf("decoding. recursion limit: %d total item count limit: %d\n"
, depth_limit, item_limit);
ret = lazy_bdecode(&buf[0], &buf[0] + buf.size(), e, ec, &pos
, depth_limit, item_limit);
if (ret != 0)
{