dkim_dns_set_nslist()

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SYNOPSIS 
#include <dkim.h>
int dkim_dns_set_nslist(
	DKIM_LIB *libopendkim,
        int (*func)(void *, const char *)
);
Declares the function to be used by a libopendkim instance when it needs to replace the set of nameservers used by a DNS resolver. By default, a stub function that configures the standard system resolver (when supported) is set.

The function will be passed the following arguments:

  1. A pointer to a handle that refers to the instantiated resolver service, via a prior call to to the initialization function defined by dkim_dns_set_init().
  2. A pointer to NULL-terminated, comma-separated list of nameservers to be used. The underlying implementation may not use all of the ones provided as it might have a fixed limit. Consult your resolver's documentation.
The function is expected to return one of the following:
  • DKIM_DNS_SUCCESS -- query was successfully canceled
  • DKIM_DNS_ERROR -- an error occurred
DESCRIPTION
Called When dkim_dns_set_nslist() can be called at any time, but is presumably most useful prior to doing any DNS operations such as are done during dkim_eoh() when verifying. The function will be called implicitly if no service handle has been stored and a query is ready to be started.
ARGUMENTS
ArgumentDescription
libopendkim The library instantiation handle, returned by dkim_init().
func A pointer to a function that should be used to change the list of nameservers to be queried by the DNS resolver.
RETURN VALUES
  • DKIM_DNS_SUCCESS -- successful operation
  • DKIM_DNS_ERROR -- an error occurred
NOTES
  • None.
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