avformat/ip: factorize some IP filtering and resolving functions to a new file

These are based on the very similar UDP and RTP protocol functions.

Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 72 insertions, 0 deletions

diff --git a/libavformat/ip.h b/libavformat/ip.h
new file mode 100644
index 0000000..b76cdab
--- /dev/null
+++ b/libavformat/ip.h
@@ -0,0 +1,72 @@
+/*
+ * IP common code
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_IP_H
+#define AVFORMAT_IP_H
+
+#include "network.h"
+
+/**
+ * Structure for storing IP (UDP) source filters or block lists.
+ */
+typedef struct IPSourceFilters {
+    int nb_include_addrs;
+    int nb_exclude_addrs;
+    struct sockaddr_storage *include_addrs;
+    struct sockaddr_storage *exclude_addrs;
+} IPSourceFilters;
+
+/**
+ * Checks the source address against a given IP source filter.
+ * @return 0 if packet should be processed based on the filter, 1 if the packet
+ *         can be dropped.
+ */
+int ff_ip_check_source_lists(struct sockaddr_storage *source_addr_ptr, IPSourceFilters *s);
+
+/**
+ * Resolves hostname into an addrinfo structure.
+ * @return addrinfo structure which should be freed by the user, NULL in case
+ *         of error.
+ */
+struct addrinfo *ff_ip_resolve_host(void *log_ctx,
+                                    const char *hostname, int port,
+                                    int type, int family, int flags);
+
+/**
+ * Parses the address[,address] source list in buf and adds it to the filters
+ * in the IPSourceFilters structure.
+ * @return 0 on success, < 0 AVERROR code on error.
+ */
+int ff_ip_parse_sources(void *log_ctx, const char *buf, IPSourceFilters *filters);
+
+/**
+ * Parses the address[,address] source block list in buf and adds it to the
+ * filters in the IPSourceFilters structure.
+ * @return 0 on success, < 0 AVERROR code on error.
+ */
+int ff_ip_parse_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters);
+
+/**
+ * Resets the IP filter list and frees the internal fields of an
+ * IPSourceFilters structure.
+ */
+void ff_ip_reset_filters(IPSourceFilters *filters);
+
+#endif /* AVFORMAT_IP_H */