[FFmpeg-devel] [PATCH v3 2/3] avformat/udp: Fix IP_MULTICAST_TTL for BSD compatibility

lance.lmwang at gmail.com lance.lmwang at gmail.com
Sat Feb 12 02:39:57 EET 2022


On Fri, Feb 11, 2022 at 10:05:19PM +0100, Marton Balint wrote:
> 
> 
> On Sat, 5 Feb 2022, lance.lmwang at gmail.com wrote:
> 
> > From: Limin Wang <lance.lmwang at gmail.com>
> > 
> > Suggested by zhilizhao, vlc project has solved the compatibility by
> > the same way, so I borrowed the comments from vlc project.
> > 
> > Fix #ticket9449
> > 
> > Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> > ---
> > libavformat/udp.c | 15 +++++++++++++--
> > 1 file changed, 13 insertions(+), 2 deletions(-)
> > 
> > diff --git a/libavformat/udp.c b/libavformat/udp.c
> > index 8178d0e..1871acf 100644
> > --- a/libavformat/udp.c
> > +++ b/libavformat/udp.c
> > @@ -164,6 +164,10 @@ static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
> > {
> >     int protocol, cmd;
> > 
> > +    /* There is some confusion in the world whether IP_MULTICAST_TTL
> > +     * takes a byte or an int as an argument.
> > +     * BSD seems to indicate byte so we are going with that and use
> > +     * int and fall back to byte to be safe */
> >     switch (addr->sa_family) {
> > #ifdef IP_MULTICAST_TTL
> >         case AF_INET:
> > @@ -182,8 +186,15 @@ static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
> >     }
> > 
> >     if (setsockopt(sockfd, protocol, cmd, &mcastTTL, sizeof(mcastTTL)) < 0) {
> > -        ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IPV4/IPV6 MULTICAST TTL)");
> > -        return ff_neterrno();
> > +        /* BSD compatibility */
> > +        unsigned char ttl;
> > +
> > +        ff_log_net_error(logctx, AV_LOG_DEBUG, "setsockopt(IPV4/IPV6 MULTICAST TTL)");
> > +        ttl = (unsigned char)(( mcastTTL > 255 ) ? 255 : mcastTTL);
> 
> I guess this limit check here is no longer needed after the range checking
> patches, so just remove. Otherwise LGTM.

Yes, I have replied to Chad Fraleigh in another email and have removed the check already.

> 
> Thanks,
> Marton
> 
> > +        if (setsockopt(sockfd, protocol, cmd, &ttl, sizeof(ttl)) < 0) {
> > +            ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IPV4/IPV6 MULTICAST TTL)");
> > +            return ff_neterrno();
> > +        }
> >     }
> > 
> >     return 0;
> > -- 
> > 1.8.3.1
> > 
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-- 
Thanks,
Limin Wang


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