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

Message ID 1644064308-21729-2-git-send-email-lance.lmwang@gmail.com
State New
Headers show
Series [FFmpeg-devel,v3,1/3] avformat/udp: use one setsockopt for ipv4/ipv6 | expand

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Commit Message

Lance Wang Feb. 5, 2022, 12:31 p.m. UTC 
From: Limin Wang <lance.lmwang@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@gmail.com>
---
 libavformat/udp.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Comments

Marton Balint Feb. 11, 2022, 9:05 p.m. UTC | #1 
On Sat, 5 Feb 2022, lance.lmwang@gmail.com wrote:

> From: Limin Wang <lance.lmwang@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@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.

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
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
Lance Wang Feb. 12, 2022, 12:39 a.m. UTC | #2 
On Fri, Feb 11, 2022 at 10:05:19PM +0100, Marton Balint wrote:
> 
> 
> On Sat, 5 Feb 2022, lance.lmwang@gmail.com wrote:
> 
> > From: Limin Wang <lance.lmwang@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@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
> > 
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> > 
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> > 
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> 
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
diff mbox series

Patch

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);
+        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;