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res_rtp_asterisk: Add support for DTLS packet fragmentation.

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This change adds support for larger TLS certificates by allowing
OpenSSL to fragment the DTLS packets according to the configured
MTU. By default this is set to 1200.

This is accomplished by implementing our own BIO method that
supports MTU querying. The configured MTU is returned to OpenSSL
which fragments the packet accordingly. When a packet is to be
sent it is done directly out the RTP instance.

ASTERISK-28018

Change-Id: If2d5032019a28ffd48f43e9e93ed71dbdbf39c06
This commit is contained in:
Joshua Colp
2019-06-11 09:26:42 -03:00
parent ca462f6e15
commit 82789aafd6
7 changed files with 284 additions and 54 deletions
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5
doc/CHANGES-staging/res_rtp_asterisk_dtls_fragmentation.txt Normal file
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Subject: res_rtp_asterisk
DTLS packets will now be fragmented according to the MTU as set in rtp.conf. This
allows larger certificates to be used for the DTLS negotiation. By default this value
is 1200.