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#include <dnswire/writer.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "create_dnstap.c"
int main(int argc, const char* argv[])
{
if (argc < 2) {
fprintf(stderr, "usage: writer <file>\n");
return 1;
}
/*
* We start by opening the output file for writing.
*/
FILE* fp = fopen(argv[1], "w");
if (!fp) {
fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
return 1;
}
/*
* We first initialize the writer and check that it can allocate the
* buffers it needs.
*/
struct dnswire_writer writer;
if (dnswire_writer_init(&writer) != dnswire_ok) {
fprintf(stderr, "Unable to initialize dnswire writer\n");
return 1;
}
/*
* Now we create a DNSTAP message.
*/
struct dnstap d = create_dnstap("writer");
/*
* We set the DNSTAP message the writer should write.
*/
dnswire_writer_set_dnstap(writer, &d);
/*
* We now loop and wait for the DNSTAP message to be written.
*/
int done = 0;
while (!done) {
switch (dnswire_writer_fwrite(&writer, fp)) {
case dnswire_ok:
/*
* The DNSTAP message was written successfully, we can now set
* a new DNSTAP message for the writer or stop the stream.
*
* This stops the stream, loop again until it's stopped.
*/
dnswire_writer_stop(&writer);
break;
case dnswire_again:
break;
case dnswire_endofdata:
/*
* The stream is stopped, we're done!
*/
done = 1;
break;
default:
fprintf(stderr, "dnswire_writer_fwrite() error\n");
done = 1;
}
}
dnswire_writer_destroy(writer);
fclose(fp);
return 0;
}
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