From 89bc0b6cae6e40e9247bf911162b0aee0c818c4c Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Mon, 23 Nov 2015 15:24:50 +0000 Subject: util: add base64 decoding function The standard glib provided g_base64_decode doesn't provide any kind of sensible error checking on its input. Add a QEMU custom wrapper qbase64_decode which can be used with untrustworthy input that can contain invalid base64 characters, embedded NUL characters, or not be NUL terminated at all. Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrange --- include/qemu/base64.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 include/qemu/base64.h (limited to 'include/qemu') diff --git a/include/qemu/base64.h b/include/qemu/base64.h new file mode 100644 index 0000000..793708d --- /dev/null +++ b/include/qemu/base64.h @@ -0,0 +1,58 @@ +/* + * QEMU base64 helpers + * + * Copyright (c) 2015 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#ifndef QEMU_BASE64_H__ +#define QEMU_BASE64_H__ + +#include "qemu-common.h" + + +/** + * qbase64_decode: + * @input: the (possibly) base64 encoded text + * @in_len: length of @input or -1 if NUL terminated + * @out_len: filled with length of decoded data + * @errp: pointer to a NULL-initialized error object + * + * Attempt to decode the (possibly) base64 encoded + * text provided in @input. If the @input text may + * contain embedded NUL characters, or may not be + * NUL terminated, then @in_len must be set to the + * known size of the @input buffer. + * + * Note that embedded NULs, or lack of a NUL terminator + * are considered invalid base64 data and errors + * will be reported to this effect. + * + * If decoding is successful, the decoded data will + * be returned and @out_len set to indicate the + * number of bytes in the decoded data. The caller + * must use g_free() to free the returned data when + * it is no longer required. + * + * Returns: the decoded data or NULL + */ +uint8_t *qbase64_decode(const char *input, + size_t in_len, + size_t *out_len, + Error **errp); + + +#endif /* QEMU_BUFFER_H__ */ -- cgit v1.1