[FFmpeg-devel] [PATCH v4] avformat/http, icecast, rtsp: Add option to disable send-100-continue
Michael Niedermayer
michael at niedermayer.cc
Sun Mar 31 04:13:58 EEST 2019
On Fri, Mar 29, 2019 at 03:59:21PM -0700, Jun Li wrote:
> On Wed, Mar 27, 2019 at 11:27 PM Jun Li <junli1026 at gmail.com> wrote:
>
> >
> >
> > On Mon, Mar 25, 2019 at 2:42 PM Jun Li <junli1026 at gmail.com> wrote:
> >
> >>
> >>
> >> On Fri, Mar 22, 2019 at 4:12 PM Jun Li <junli1026 at gmail.com> wrote:
> >>
> >>> The current setting for send-100-continue option is either
> >>> enabled if applicable or forced enabled, no option to force
> >>> disable the header. This change is to expand the option setting
> >>> to provide more flexibility, which is useful for rstp case.
> >>> ---
> >>> libavformat/http.c | 28 +++++++++++++++++-----------
> >>> libavformat/icecast.c | 2 +-
> >>> libavformat/rtsp.c | 1 +
> >>> 3 files changed, 19 insertions(+), 12 deletions(-)
> >>>
> >>> diff --git a/libavformat/http.c b/libavformat/http.c
> >>> index 74d743850d..5a937994cf 100644
> >>> --- a/libavformat/http.c
> >>> +++ b/libavformat/http.c
> >>> @@ -113,6 +113,7 @@ typedef struct HTTPContext {
> >>> uint8_t *inflate_buffer;
> >>> #endif /* CONFIG_ZLIB */
> >>> AVDictionary *chained_options;
> >>> + /* -1 = try to send if applicable, 0 = always disabled, 1 = always
> >>> enabled */
> >>> int send_expect_100;
> >>> char *method;
> >>> int reconnect;
> >>> @@ -155,7 +156,7 @@ static const AVOption options[] = {
> >>> { "auth_type", "HTTP authentication type",
> >>> OFFSET(auth_state.auth_type), AV_OPT_TYPE_INT, { .i64 = HTTP_AUTH_NONE },
> >>> HTTP_AUTH_NONE, HTTP_AUTH_BASIC, D | E, "auth_type"},
> >>> { "none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, {
> >>> .i64 = HTTP_AUTH_NONE }, 0, 0, D | E, "auth_type"},
> >>> { "basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, {
> >>> .i64 = HTTP_AUTH_BASIC }, 0, 0, D | E, "auth_type"},
> >>> - { "send_expect_100", "Force sending an Expect: 100-continue header
> >>> for POST", OFFSET(send_expect_100), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E
> >>> },
> >>> + { "send_expect_100", "Force sending an Expect: 100-continue header
> >>> for POST", OFFSET(send_expect_100), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1,
> >>> E },
> >>> { "location", "The actual location of the data received",
> >>> OFFSET(location), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D | E },
> >>> { "offset", "initial byte offset", OFFSET(off), AV_OPT_TYPE_INT64,
> >>> { .i64 = 0 }, 0, INT64_MAX, D },
> >>> { "end_offset", "try to limit the request to bytes preceding this
> >>> offset", OFFSET(end_off), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, D
> >>> },
> >>> @@ -1179,16 +1180,21 @@ static int http_connect(URLContext *h, const
> >>> char *path, const char *local_path,
> >>> local_path, method);
> >>> proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state,
> >>> proxyauth,
> >>> local_path, method);
> >>> - if (post && !s->post_data) {
> >>> - send_expect_100 = s->send_expect_100;
> >>> - /* The user has supplied authentication but we don't know the
> >>> auth type,
> >>> - * send Expect: 100-continue to get the 401 response including
> >>> the
> >>> - * WWW-Authenticate header, or an 100 continue if no auth
> >>> actually
> >>> - * is needed. */
> >>> - if (auth && *auth &&
> >>> - s->auth_state.auth_type == HTTP_AUTH_NONE &&
> >>> - s->http_code != 401)
> >>> - send_expect_100 = 1;
> >>> +
> >>> + if (post && !s->post_data) {
> >>> + if (s->send_expect_100 != -1) {
> >>> + send_expect_100 = s->send_expect_100;
> >>> + } else {
> >>> + send_expect_100 = 0;
> >>> + /* The user has supplied authentication but we don't know
> >>> the auth type,
> >>> + * send Expect: 100-continue to get the 401 response
> >>> including the
> >>> + * WWW-Authenticate header, or an 100 continue if no auth
> >>> actually
> >>> + * is needed. */
> >>> + if (auth && *auth &&
> >>> + s->auth_state.auth_type == HTTP_AUTH_NONE &&
> >>> + s->http_code != 401)
> >>> + send_expect_100 = 1;
> >>> + }
> >>> }
> >>>
> >>> #if FF_API_HTTP_USER_AGENT
> >>> diff --git a/libavformat/icecast.c b/libavformat/icecast.c
> >>> index c93b06b553..d2198b78ec 100644
> >>> --- a/libavformat/icecast.c
> >>> +++ b/libavformat/icecast.c
> >>> @@ -115,7 +115,7 @@ static int icecast_open(URLContext *h, const char
> >>> *uri, int flags)
> >>> av_dict_set(&opt_dict, "auth_type", "basic", 0);
> >>> av_dict_set(&opt_dict, "headers", headers, 0);
> >>> av_dict_set(&opt_dict, "chunked_post", "0", 0);
> >>> - av_dict_set(&opt_dict, "send_expect_100", s->legacy_icecast ? "0" :
> >>> "1", 0);
> >>> + av_dict_set(&opt_dict, "send_expect_100", s->legacy_icecast ? "-1"
> >>> : "1", 0);
> >>> if (NOT_EMPTY(s->content_type))
> >>> av_dict_set(&opt_dict, "content_type", s->content_type, 0);
> >>> else
> >>> diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
> >>> index ae8811234a..6e67e411b9 100644
> >>> --- a/libavformat/rtsp.c
> >>> +++ b/libavformat/rtsp.c
> >>> @@ -1793,6 +1793,7 @@ redirect:
> >>> sessioncookie);
> >>> av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
> >>> av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
> >>> + av_opt_set(rt->rtsp_hd_out->priv_data, "send_expect_100", "0",
> >>> 0);
> >>>
> >>> /* Initialize the authentication state for the POST session.
> >>> The HTTP
> >>> * protocol implementation doesn't properly handle multi-pass
> >>> --
> >>> 2.17.1
> >>>
> >>
> >>
> >> Ping.
> >> The current setting for send_100_expect in http.c is applicable only when
> >> request is POST
> >> and post body is empty. The code checks the post body as this:
> >> * + if (post && !s->post_data) { *
> >> ......
> >>
> >> This is absolutely correct. But rtsp tunnel in http is a special case. It
> >> post the http header
> >> without any post_data, and then write the tunneled data into the tcp file
> >> descriptor -- that is
> >> two steps and skips the s->post_data.
> >>
> >> So in the case, it exactly falls into the send_100_expect condition
> >> although the real post data
> >> will be written to fd later. It is also an issue when I test it with IP
> >> cameras because they don't
> >> support "Expect: 100-continue".
> >>
> >> I don't see a smart fix in http.c because whoever use http.c can skip the
> >> http API and write
> >> to the TCP fd directly. This kind of behavior will create a a valid post
> >> operation but http.c
> >> would never get any information of post_data. It kind of skips the http
> >> layer and directly talk
> >> to the tcp.
> >>
> >> So the patch here I proposed another path --- trust the user who is using
> >> http.c. In this specific
> >> case, it is rtsp.c who is using http.c, so it is rtsp's obligation to
> >> configure the correct header since
> >> it choose to skip http and write post data directly to the file
> >> descriptor.
> >>
> >> This is how this patch comes out.
> >>
> >> Thanks
> >> -Jun
> >>
> >
> >
> > Ping x 2
> > Someone met the same issue with me, ticket 7297 --
> > https://trac.ffmpeg.org/ticket/7297
> >
> > This patch is to fix the rtsp tunnel http issue. The root cause is the
> > "Expect:100-continue" in the http header, it is applicable only when
> > request is POST and post body is empty. The code checks the post body is as
> > following in http.c:
> > * + if (post && !s->post_data) { *
> > ......
> >
> > This is correct in most cases but rtsp tunnel in http is special. It post
> > the http header WITHOUT any post_data, and then write the post data into
> > the tcp file descriptor directly.
> >
> > So in the case, it exactly falls into the send_100_expect condition
> > although the real post data will be written to fd later. It is also an
> > issue when I test it with IP cameras because they don't support "Expect:
> > 100-continue".
> >
> > So this patch is for fixing the rtsp tunnel http issue.
> >
> > Thanks
> > -Jun
> >
>
>
> Ping x 3.
> Could someone take a look at this patch please ? This is for addressing
> this ticket https://trac.ffmpeg.org/ticket/7297
If this patch fixes ticket 7297 then the commit message should say so
the option also may need documentation unless its private (which it is not
currently) its listed in -h full
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
"You are 36 times more likely to die in a bathtub than at the hands of a
terrorist. Also, you are 2.5 times more likely to become a president and
2 times more likely to become an astronaut, than to die in a terrorist
attack." -- Thoughty2
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