diff options
Diffstat (limited to 'evutil.c')
| -rw-r--r-- | evutil.c | 14 |
1 files changed, 12 insertions, 2 deletions
@@ -212,11 +212,21 @@ create_tmpfile(char tmpfile[MAX_PATH]) { char short_path[MAX_PATH] = {0}; char long_path[MAX_PATH] = {0}; - char *tmp_file = tmpfile; + char prefix[4] = {0}; + // GetTempFileNameA() uses up to the first three characters of the prefix + // and windows filesystems are case-insensitive + const char *base32set = "abcdefghijklmnopqrstuvwxyz012345"; + ev_uint16_t rnd; + + evutil_secure_rng_get_bytes(&rnd, sizeof(rnd)); + prefix[0] = base32set[(rnd ) & 31]; + prefix[1] = base32set[(rnd >> 5) & 31]; + prefix[2] = base32set[(rnd >> 10) & 31]; + prefix[3] = '\0'; GetTempPathA(MAX_PATH, short_path); GetLongPathNameA(short_path, long_path, MAX_PATH); - if (!GetTempFileNameA(long_path, NULL, 0, tmp_file)) { + if (!GetTempFileNameA(long_path, prefix, 0, tmpfile)) { event_warnx("GetTempFileName failed: %d", EVUTIL_SOCKET_ERROR()); return -1; } |