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[lwip-devel] [patch #9169] Allows multicast packets through udp input la
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From: |
David van Moolenbroek |
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Subject: |
[lwip-devel] [patch #9169] Allows multicast packets through udp input layer |
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Date: |
Sat, 17 Dec 2016 20:38:16 -0000 |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0 |
Follow-up Comment #8, patch #9169 (project lwip):
> Am I missing something?
You really are confusing bind and connect. If you want to receive multicast
packets sent *to* 239.1.80.1, you bind the socket to 239.1.80.1 (along with
the destination port), in addition to joining the multicast group. If you want
to receive such packets sent *from* 192.168.1.2 or 192.168.1.3 only, you will
have to perform such source-IP checks in the application - but that does not
seem to be what you want anyway. In other words, to achieve what you
originally wanted, you can simply do this:
struct ip_addr multicast_addr;
IP4_ADDR(&multicast_addr, 239, 1, 80, 1);
int mPort= 12032;
udp_bind(this->pcb, &multicast_addr, mPort);
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