Пример #1
0
int
lwres_getrrsetbyname_read(struct lwres_async_state **plas,
			  lwres_context_t *ctx,
			  struct rrsetinfo **res)
{
	lwres_result_t lwresult;
	lwres_grbnresponse_t *response = NULL;
	char *buffer;
	struct rrsetinfo *rrset = NULL;
	int recvlen;
	int ret, result;
	unsigned int i;
	lwres_buffer_t            b_in;
	struct lwres_async_state *las;
	struct lwres_async_state **las_prev;
	lwres_lwpacket_t pkt;

	buffer = NULL;
	buffer = CTXMALLOC(LWRES_RECVLENGTH);
	if (buffer == NULL) {
		return ERRSET_NOMEMORY;
	}

	ret = LWRES_R_SUCCESS;
	lwresult = lwres_context_recv(ctx, buffer, LWRES_RECVLENGTH, &recvlen);
	if (lwresult == LWRES_R_RETRY) {
		ret = LWRES_R_RETRY;
		goto out;
	}
	
	if (ret != LWRES_R_SUCCESS) 
		goto out;

	lwres_buffer_init(&b_in, buffer, recvlen);
	b_in.used = recvlen;

	/*
	 * Parse the packet header.
	 */
	ret = lwres_lwpacket_parseheader(&b_in, &pkt);
	if (ret != LWRES_R_SUCCESS)
		goto out;

	/*
	 * find an appropriate waiting las entry. This is a linear search.
	 * we can do MUCH better, since we control the serial number!
	 * do that later.
	 */
	las_prev = &ctx->pending;
	las = ctx->pending;
	while(las && las->serial != pkt.serial) {
		las_prev=&las->next;
		las=las->next;
	}

	if(las == NULL) {
		/* no matching serial number! */
		return(LWRES_R_RETRY);
	}

	/* okay, remove it from the receive queue */
	*las_prev = las->next;
	las->next = NULL;
	las->inqueue = 0;

	*plas = las;

	/*
	 * Free what we've transmitted, long ago.
	 */
	CTXFREE(las->b_out.base, las->b_out.length);
	las->b_out.base = NULL;
	las->b_out.length = 0;

	if (pkt.result != LWRES_R_SUCCESS) {
		ret = pkt.result;
		goto out;
	}

	/*
	 * Parse the response.
	 */
	ret = lwres_grbnresponse_parse(ctx, &b_in, &pkt, &response);
	if (ret != LWRES_R_SUCCESS) {
	out:
		if (buffer != NULL)
			CTXFREE(buffer, LWRES_RECVLENGTH);
		if (response != NULL)
			lwres_grbnresponse_free(ctx, &response);
		result = lwresult_to_result(ret);
		goto fail;
	}

	response->base = buffer;
	response->baselen = LWRES_RECVLENGTH;
	buffer = NULL; /* don't free this below */

	lwresult = LWRES_R_SUCCESS;

	rrset = sane_malloc(sizeof(struct rrsetinfo));
	if (rrset == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	rrset->rri_name = NULL;
	rrset->rri_rdclass = response->rdclass;
	rrset->rri_rdtype = response->rdtype;
	rrset->rri_ttl = response->ttl;
	rrset->rri_flags = 0;
	rrset->rri_nrdatas = 0;
	rrset->rri_rdatas = NULL;
	rrset->rri_nsigs = 0;
	rrset->rri_sigs = NULL;

	rrset->rri_name = sane_malloc(response->realnamelen + 1);
	if (rrset->rri_name == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	strncpy(rrset->rri_name, response->realname, response->realnamelen);
	rrset->rri_name[response->realnamelen] = 0;

	if ((response->flags & LWRDATA_VALIDATED) != 0)
		rrset->rri_flags |= RRSET_VALIDATED;

	rrset->rri_nrdatas = response->nrdatas;
	rrset->rri_rdatas = sane_calloc(rrset->rri_nrdatas,
				   sizeof(struct rdatainfo));
	if (rrset->rri_rdatas == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	for (i = 0; i < rrset->rri_nrdatas; i++) {
		rrset->rri_rdatas[i].rdi_length = response->rdatalen[i];
		rrset->rri_rdatas[i].rdi_data =
				sane_malloc(rrset->rri_rdatas[i].rdi_length);
		if (rrset->rri_rdatas[i].rdi_data == NULL) {
			result = ERRSET_NOMEMORY;
			goto fail;
		}
		memcpy(rrset->rri_rdatas[i].rdi_data, response->rdatas[i],
		       rrset->rri_rdatas[i].rdi_length);
	}
	rrset->rri_nsigs = response->nsigs;
	rrset->rri_sigs = sane_calloc(rrset->rri_nsigs,
				      sizeof(struct rdatainfo));
	if (rrset->rri_sigs == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	for (i = 0; i < rrset->rri_nsigs; i++) {
		rrset->rri_sigs[i].rdi_length = response->siglen[i];
		rrset->rri_sigs[i].rdi_data =
				sane_malloc(rrset->rri_sigs[i].rdi_length);
		if (rrset->rri_sigs[i].rdi_data == NULL) {
			result = ERRSET_NOMEMORY;
			goto fail;
		}
		memcpy(rrset->rri_sigs[i].rdi_data, response->sigs[i],
		       rrset->rri_sigs[i].rdi_length);
	}

	lwres_grbnresponse_free(ctx, &response);

	*res = rrset;
	return (ERRSET_SUCCESS);
 fail:
	if (rrset != NULL)
		lwres_freerrset(rrset);
	if (response != NULL)
		lwres_grbnresponse_free(ctx, &response);
	return (result);

}
Пример #2
0
/*% Returns a set of resource records associated with a hostname, class, and type. hostname is a pointer a to null-terminated string. */
int
lwres_getrrsetbyname(const char *hostname, unsigned int rdclass,
		     unsigned int rdtype, unsigned int flags,
		     struct rrsetinfo **res)
{
	lwres_context_t *lwrctx = NULL;
	lwres_result_t lwresult;
	lwres_grbnresponse_t *response = NULL;
	struct rrsetinfo *rrset = NULL;
	unsigned int i;
	unsigned int lwflags;
	unsigned int result;

	if (rdclass > 0xffff || rdtype > 0xffff) {
		result = ERRSET_INVAL;
		goto fail;
	}

	/*
	 * Don't allow queries of class or type ANY
	 */
	if (rdclass == 0xff || rdtype == 0xff) {
		result = ERRSET_INVAL;
		goto fail;
	}

	lwresult = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
	if (lwresult != LWRES_R_SUCCESS) {
		result = lwresult_to_result(lwresult);
		goto fail;
	}
	(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);

	/*
	 * If any input flags were defined, lwflags would be set here
	 * based on them
	 */
	UNUSED(flags);
	lwflags = 0;

	lwresult = lwres_getrdatabyname(lwrctx, hostname,
					(lwres_uint16_t)rdclass, 
					(lwres_uint16_t)rdtype,
					lwflags, &response);
	if (lwresult != LWRES_R_SUCCESS) {
		result = lwresult_to_result(lwresult);
		goto fail;
	}

	rrset = sane_malloc(sizeof(struct rrsetinfo));
	if (rrset == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	rrset->rri_name = NULL;
	rrset->rri_rdclass = response->rdclass;
	rrset->rri_rdtype = response->rdtype;
	rrset->rri_ttl = response->ttl;
	rrset->rri_flags = 0;
	rrset->rri_nrdatas = 0;
	rrset->rri_rdatas = NULL;
	rrset->rri_nsigs = 0;
	rrset->rri_sigs = NULL;

	rrset->rri_name = sane_malloc(response->realnamelen + 1);
	if (rrset->rri_name == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	strncpy(rrset->rri_name, response->realname, response->realnamelen);
	rrset->rri_name[response->realnamelen] = 0;

	if ((response->flags & LWRDATA_VALIDATED) != 0)
		rrset->rri_flags |= RRSET_VALIDATED;

	rrset->rri_nrdatas = response->nrdatas;
	rrset->rri_rdatas = sane_calloc(rrset->rri_nrdatas,
				   sizeof(struct rdatainfo));
	if (rrset->rri_rdatas == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	for (i = 0; i < rrset->rri_nrdatas; i++) {
		rrset->rri_rdatas[i].rdi_length = response->rdatalen[i];
		rrset->rri_rdatas[i].rdi_data =
				sane_malloc(rrset->rri_rdatas[i].rdi_length);
		if (rrset->rri_rdatas[i].rdi_data == NULL) {
			result = ERRSET_NOMEMORY;
			goto fail;
		}
		memcpy(rrset->rri_rdatas[i].rdi_data, response->rdatas[i],
		       rrset->rri_rdatas[i].rdi_length);
	}
	rrset->rri_nsigs = response->nsigs;
	rrset->rri_sigs = sane_calloc(rrset->rri_nsigs,
				      sizeof(struct rdatainfo));
	if (rrset->rri_sigs == NULL) {
		result = ERRSET_NOMEMORY;
		goto fail;
	}
	for (i = 0; i < rrset->rri_nsigs; i++) {
		rrset->rri_sigs[i].rdi_length = response->siglen[i];
		rrset->rri_sigs[i].rdi_data =
				sane_malloc(rrset->rri_sigs[i].rdi_length);
		if (rrset->rri_sigs[i].rdi_data == NULL) {
			result = ERRSET_NOMEMORY;
			goto fail;
		}
		memcpy(rrset->rri_sigs[i].rdi_data, response->sigs[i],
		       rrset->rri_sigs[i].rdi_length);
	}

	lwres_grbnresponse_free(lwrctx, &response);
	lwres_conf_clear(lwrctx);
	lwres_context_destroy(&lwrctx);
	*res = rrset;
	return (ERRSET_SUCCESS);
 fail:
	if (rrset != NULL)
		lwres_freerrset(rrset);
	if (response != NULL)
		lwres_grbnresponse_free(lwrctx, &response);
	if (lwrctx != NULL) {
		lwres_conf_clear(lwrctx);
		lwres_context_destroy(&lwrctx);
	}
	return (result);
}