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[nsapi] Refactor dns-query #2497

Merged
merged 7 commits into from
Aug 26, 2016
Merged

[nsapi] Refactor dns-query #2497

merged 7 commits into from
Aug 26, 2016

Commits on Aug 26, 2016

  1. [nsapi] Refactored dns-query to match style of the rest of the nsapi 

    Internal API changes:
dnsQuery -> nsapi_dns_query

Additionally restructured query code to emit/parse network structures
in stream form to hopefully document the underlying structure more
explicitly.
    @geky
    geky committed Aug 26, 2016
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  2. [nsapi] Added support for multiple results in a dns-query 

    Internal API changes:
+ nsapi_dns_query_multiple

Note, dns_query_multiple takes a buffer of nsapi_addr_t to fill. This is
less dynamic than the linked-list method used in linux's gethostbyname,
but is easier to manage and more constrained.
    @geky
    geky committed Aug 26, 2016
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  3. [nsapi] Added IPv6 support to DNS query 

    To avoid complications with unexpected IP versions, the wanted
IP version was added as an extra argument to DNS query functions
(defaults to NSAPI_IPv4).

Internal API changes:
m nsapi_dns_query
m nsapi_dns_query_multiple

Interestingly, though multiple questions can be encoded in a single
DNS packet, few, if any, nameservers respect any but the first
question. This makes support for coelescing DNS queries useless.
    @geky
    geky committed Aug 26, 2016
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  4. [nsapi] Removed unnecessary dns_query functions

    @geky
    geky committed Aug 26, 2016
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  5. [nsapi] Add support for implementation-provided DNS servers 

    Support intended for DNS servers provided by DHCP requests.
    @geky
    geky committed Aug 26, 2016
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  6. [nsapi] Adopted netconn_gethostbyname in the lwip interface 

    Provides proper integration with DHCP through lwip
    @geky
    geky committed Aug 26, 2016
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  7. [nsapi] Restructured nsapi_dns.h to have clear separation between C/C++ 

    - Separated overloads based on language
- Removed NSAPI_C_LINKAGE definition
    @geky
    geky committed Aug 26, 2016
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