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Reverse example

This commit is contained in:
Willem Toorop 2015-10-06 23:07:57 +02:00
parent 820a657297
commit 5e269b69fa
2 changed files with 118 additions and 2 deletions
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10
spec/example/Makefile.in
View File

@ -48,9 +48,9 @@ LDFLAGS=@LDFLAGS@ -L../../src
LDLIBS=../../src/libgetdns.la @LIBS@
OBJS=example-all-functions.lo example-simple-answers.lo example-tree.lo example-synchronous.lo example-reverse.lo synchronous-json-pointer.lo simple-json-pointer.lo tree-json-pointer.lo
OBJS=example-all-functions.lo example-simple-answers.lo example-tree.lo example-synchronous.lo example-reverse.lo synchronous-json-pointer.lo simple-json-pointer.lo tree-json-pointer.lo reverse-json-pointer.lo
PROGRAMS=example-all-functions example-synchronous example-simple-answers example-tree example-reverse synchronous-json-pointer simple-json-pointer tree-json-pointer
PROGRAMS=example-all-functions example-synchronous example-simple-answers example-tree example-reverse synchronous-json-pointer simple-json-pointer tree-json-pointer reverse-json-pointer
.SUFFIXES: .c .o .a .lo .h
@ -83,6 +83,9 @@ simple-json-pointer: simple-json-pointer.lo
tree-json-pointer: tree-json-pointer.lo
$(LIBTOOL) --tag=CC --mode=link $(CC) $(CFLAGS) $(LDFLAGS) $(LDLIBS) $(EXTENSION_LIBEVENT_LIB) $(EXTENSION_LIBEVENT_LDFLAGS) $(EXTENSION_LIBEVENT_EXT_LIBS) -o $@ tree-json-pointer.lo
reverse-json-pointer: reverse-json-pointer.lo
$(LIBTOOL) --tag=CC --mode=link $(CC) $(CFLAGS) $(LDFLAGS) $(LDLIBS) $(EXTENSION_LIBEVENT_LIB) $(EXTENSION_LIBEVENT_LDFLAGS) $(EXTENSION_LIBEVENT_EXT_LIBS) -o $@ reverse-json-pointer.lo
$(EXTENSION_LIBEVENT_LIB):
@echo "***"
@echo "*** Three examples from the specification need libevent."
@ -169,6 +172,9 @@ example-synchronous.lo example-synchronous.o: $(srcdir)/example-synchronous.c $(
example-tree.lo example-tree.o: $(srcdir)/example-tree.c $(srcdir)/getdns_libevent.h ../../src/config.h \
../../src/getdns/getdns.h $(srcdir)/../../src/getdns/getdns_ext_libevent.h \
$(srcdir)/../../src/getdns/getdns_extra.h
reverse-json-pointer.lo reverse-json-pointer.o: $(srcdir)/reverse-json-pointer.c $(srcdir)/getdns_libevent.h \
../../src/config.h ../../src/getdns/getdns.h \
$(srcdir)/../../src/getdns/getdns_ext_libevent.h $(srcdir)/../../src/getdns/getdns_extra.h
simple-concise.lo simple-concise.o: $(srcdir)/simple-concise.c $(srcdir)/getdns_libevent.h ../../src/config.h \
../../src/getdns/getdns.h $(srcdir)/../../src/getdns/getdns_ext_libevent.h \
$(srcdir)/../../src/getdns/getdns_extra.h

110
spec/example/reverse-json-pointer.c Normal file
View File

@ -0,0 +1,110 @@
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <getdns_libevent.h>
/* Set up the callback function, which will also do the processing of the results */
void callback(getdns_context *context,
getdns_callback_type_t callback_type,
getdns_dict *response,
void *userarg,
getdns_transaction_t transaction_id)
{
getdns_return_t r; /* Holder for all function returns */
getdns_list *answer;
size_t n_answers, i;
switch(callback_type) {
case GETDNS_CALLBACK_CANCEL:
printf("Transaction with ID %"PRIu64" was cancelled.\n", transaction_id);
return;
case GETDNS_CALLBACK_TIMEOUT:
printf("Transaction with ID %"PRIu64" timed out.\n", transaction_id);
return;
case GETDNS_CALLBACK_ERROR:
printf("An error occurred for transaction ID %"PRIu64".\n", transaction_id);
return;
default: break;
}
assert( callback_type == GETDNS_CALLBACK_COMPLETE );
if ((r = getdns_dict_get_list(response, "/replies_tree/0/answer", &answer)))
fprintf(stderr, "Could not get \"answer\" section from first reply in the reponse");
else if ((r = getdns_list_get_length(answer, &n_answers)))
fprintf(stderr, "Could not get replies_tree\'s length");
else for (i = 0; i < n_answers && r == GETDNS_RETURN_GOOD; i++) {
getdns_dict *rr;
getdns_bindata *dname;
char *dname_str;
if ((r = getdns_list_get_dict(answer, i, &rr)))
fprintf(stderr, "Could not get rr %zu from answer section", i);
else if (getdns_dict_get_bindata(rr, "/rdata/ptrdname", &dname))
continue; /* Not a PTR */
else if ((r = getdns_convert_dns_name_to_fqdn(dname, &dname_str)))
fprintf(stderr, "Could not convert PTR dname to string");
else {
printf("The dname is %s\n", dname_str);
free(dname_str);
}
}
if (r) {
assert( r != GETDNS_RETURN_GOOD );
fprintf(stderr, ": %d\n", r);
}
getdns_dict_destroy(response);
}
int main()
{
getdns_return_t r; /* Holder for all function returns */
getdns_context *context = NULL;
struct event_base *event_base = NULL;
getdns_bindata address_type = { 4, (void *)"IPv4" };
getdns_bindata address_data = { 4, (void *)"\x08\x08\x08\x08" };
getdns_dict *address = NULL;
getdns_dict *extensions = NULL;
/* Could add things here to help identify this call */
char *userarg = NULL;
getdns_transaction_t transaction_id;
if ((r = getdns_context_create(&context, 1)))
fprintf(stderr, "Trying to create the context failed");
else if (!(event_base = event_base_new()))
fprintf(stderr, "Trying to create the event base failed.\n");
else if ((r = getdns_extension_set_libevent_base(context, event_base)))
fprintf(stderr, "Setting the event base failed");
else if (!(address = getdns_dict_create()))
fprintf(stderr, "Could not create address dict.\n");
else if ((r = getdns_dict_set_bindata(address, "address_type", &address_type)))
fprintf(stderr, "Could not set address_type in address dict.\n");
else if ((r = getdns_dict_set_bindata(address, "address_data", &address_data)))
fprintf(stderr, "Could not set address_data in address dict.\n");
else if ((r = getdns_hostname( context, address, extensions
, userarg, &transaction_id, callback)))
fprintf(stderr, "Error scheduling asynchronous request");
else if (event_base_dispatch(event_base) < 0)
fprintf(stderr, "Error dispatching events\n");
/* Clean up */
if (event_base)
event_base_free(event_base);
if (context)
getdns_context_destroy(context);
/* Assuming we get here, leave gracefully */
exit(EXIT_SUCCESS);
}