[FFmpeg-cvslog] avformat/options: log filename on open

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jun  2 14:47:16 2017 +0200| [4e6de49a5a4a9269db88825ca06f24a2e522add5] | committer: Michael Niedermayer

avformat/options: log filename on open

The loglevel is choosen so that the main filename and any images of
multi image sequences are shown only at debug level to avoid
clutter.

This makes exploits in playlists more visible. As they would show
accesses to private/sensitive files

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 53e0d5d7247548743e13c59c35e59fc2161e9582)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4e6de49a5a4a9269db88825ca06f24a2e522add5
---

 libavformat/options.c | 12 ++++++++++++
 libavformat/utils.c   |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/libavformat/options.c b/libavformat/options.c
index 25a506eef8..9371c72667 100644
--- a/libavformat/options.c
+++ b/libavformat/options.c
@@ -102,6 +102,18 @@ static const AVClass av_format_context_class = {
 static int io_open_default(AVFormatContext *s, AVIOContext **pb,
                            const char *url, int flags, AVDictionary **options)
 {
+    int loglevel;
+
+    if (!strcmp(url, s->filename) ||
+        s->iformat && !strcmp(s->iformat->name, "image2") ||
+        s->oformat && !strcmp(s->oformat->name, "image2")
+    ) {
+        loglevel = AV_LOG_DEBUG;
+    } else
+        loglevel = AV_LOG_INFO;
+
+    av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
+
 #if FF_API_OLD_OPEN_CALLBACKS
 FF_DISABLE_DEPRECATION_WARNINGS
     if (s->open_cb)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index a82bbc702d..a9f8cf6f84 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -533,6 +533,7 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
     if ((ret = av_opt_set_dict(s, &tmp)) < 0)
         goto fail;
 
+    av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
     if ((ret = init_input(s, filename, &tmp)) < 0)
         goto fail;
     s->probe_score = ret;
@@ -570,7 +571,6 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
     }
 
     s->duration = s->start_time = AV_NOPTS_VALUE;
-    av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
 
     /* Allocate private data. */
     if (s->iformat->priv_data_size > 0) {