Adding upstream version 1.1.0+debian.upstream/1.1.0+debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 384 insertions, 0 deletions

diff --git a/src/output/dnssim/common.c b/src/output/dnssim/common.c
new file mode 100644
index 0000000..e170aec
--- /dev/null
+++ b/src/output/dnssim/common.c
@@ -0,0 +1,384 @@
+/*
+ * Copyright (c) 2019-2020, CZ.NIC, z.s.p.o.
+ * All rights reserved.
+ *
+ * This file is part of dnsjit.
+ *
+ * dnsjit is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * dnsjit is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with dnsjit.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "output/dnssim.h"
+#include "output/dnssim/internal.h"
+#include "output/dnssim/ll.h"
+#include "core/assert.h"
+
+#include <string.h>
+
+#define MAX_LABELS 127
+
+static core_log_t _log = LOG_T_INIT("output.dnssim");
+
+static void _close_request(_output_dnssim_request_t* req);
+
+static void _on_request_timeout(uv_timer_t* handle)
+{
+    _close_request((_output_dnssim_request_t*)handle->data);
+}
+
+static ssize_t parse_qsection(core_object_dns_t* dns)
+{
+    core_object_dns_q_t            q;
+    static core_object_dns_label_t labels[MAX_LABELS];
+    const uint8_t*                 start;
+    int                            i;
+    int                            ret;
+
+    if (!dns || !dns->have_qdcount)
+        return -1;
+
+    start = dns->at;
+
+    for (i = 0; i < dns->qdcount; i++) {
+        ret = core_object_dns_parse_q(dns, &q, labels, MAX_LABELS);
+        if (ret < 0)
+            return -1;
+    }
+
+    return (dns->at - start);
+}
+
+int _output_dnssim_answers_request(_output_dnssim_request_t* req, core_object_dns_t* response)
+{
+    const uint8_t* question;
+    ssize_t        len;
+
+    if (!response->have_id || !response->have_qdcount)
+        return _ERR_MALFORMED;
+
+    if (req->dns_q->id != response->id)
+        return _ERR_MSGID;
+
+    if (req->dns_q->qdcount != response->qdcount)
+        return _ERR_QUESTION;
+
+    question = response->at;
+    len      = parse_qsection(response);
+
+    if (req->question_len != len)
+        return _ERR_QUESTION;
+
+    if (memcmp(req->question, question, len) != 0)
+        return _ERR_QUESTION;
+
+    return 0;
+}
+
+void _output_dnssim_create_request(output_dnssim_t* self, _output_dnssim_client_t* client, core_object_payload_t* payload)
+{
+    int                       ret;
+    _output_dnssim_request_t* req;
+    mlassert_self();
+    lassert(client, "client is nil");
+    lassert(payload, "payload is nil");
+
+    lfatal_oom(req = calloc(1, sizeof(_output_dnssim_request_t)));
+    req->dnssim          = self;
+    req->client          = client;
+    req->payload         = payload;
+    req->dns_q           = core_object_dns_new();
+    req->dns_q->obj_prev = (core_object_t*)req->payload;
+    req->dnssim->ongoing++;
+    req->state = _OUTPUT_DNSSIM_REQ_ONGOING;
+    req->stats = self->stats_current;
+
+    ret = core_object_dns_parse_header(req->dns_q);
+    if (ret != 0) {
+        ldebug("discarded malformed dns query: couldn't parse header");
+        goto failure;
+    }
+
+    req->question     = req->dns_q->at;
+    req->question_len = parse_qsection(req->dns_q);
+    if (req->question_len < 0) {
+        ldebug("discarded malformed dns query: invalid question");
+        goto failure;
+    }
+
+    req->dnssim->stats_sum->requests++;
+    req->stats->requests++;
+
+    switch (_self->transport) {
+    case OUTPUT_DNSSIM_TRANSPORT_UDP_ONLY:
+    case OUTPUT_DNSSIM_TRANSPORT_UDP:
+        ret = _output_dnssim_create_query_udp(self, req);
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_TCP:
+        ret = _output_dnssim_create_query_tcp(self, req);
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_TLS:
+#if GNUTLS_VERSION_NUMBER >= DNSSIM_MIN_GNUTLS_VERSION
+        ret = _output_dnssim_create_query_tls(self, req);
+#else
+        lfatal(DNSSIM_MIN_GNUTLS_ERRORMSG);
+#endif
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_HTTPS2:
+#if GNUTLS_VERSION_NUMBER >= DNSSIM_MIN_GNUTLS_VERSION
+        ret = _output_dnssim_create_query_https2(self, req);
+#else
+        lfatal(DNSSIM_MIN_GNUTLS_ERRORMSG);
+#endif
+        break;
+    default:
+        lfatal("unsupported dnssim transport");
+        break;
+    }
+    if (ret < 0) {
+        goto failure;
+    }
+
+    req->created_at = uv_now(&_self->loop);
+    req->ended_at   = req->created_at + self->timeout_ms;
+    lfatal_oom(req->timer = malloc(sizeof(uv_timer_t)));
+    uv_timer_init(&_self->loop, req->timer);
+    req->timer->data = req;
+    uv_timer_start(req->timer, _on_request_timeout, self->timeout_ms, 0);
+
+    return;
+failure:
+    self->discarded++;
+    _close_request(req);
+    return;
+}
+
+/* Bind before connect to be able to send from different source IPs. */
+int _output_dnssim_bind_before_connect(output_dnssim_t* self, uv_handle_t* handle)
+{
+    mlassert_self();
+    lassert(handle, "handle is nil");
+
+    if (_self->source != NULL) {
+        struct sockaddr* addr = (struct sockaddr*)&_self->source->addr;
+        struct sockaddr* dest = (struct sockaddr*)&_self->target;
+        int              ret  = -1;
+        if (addr->sa_family != dest->sa_family) {
+            lfatal("failed to bind: source/desitnation address family mismatch");
+        }
+        switch (handle->type) {
+        case UV_UDP:
+            ret = uv_udp_bind((uv_udp_t*)handle, addr, 0);
+            break;
+        case UV_TCP:
+            ret = uv_tcp_bind((uv_tcp_t*)handle, addr, 0);
+            break;
+        default:
+            lfatal("failed to bind: unsupported handle type");
+            break;
+        }
+        if (ret < 0) {
+            /* This typically happens when we run out of file descriptors.
+             * Quit to prevent skewed results or unexpected behaviour. */
+            lfatal("failed to bind: %s", uv_strerror(ret));
+            return ret;
+        }
+        _self->source = _self->source->next;
+    }
+    return 0;
+}
+
+void _output_dnssim_maybe_free_request(_output_dnssim_request_t* req)
+{
+    mlassert(req, "req is nil");
+
+    if (req->qry == NULL && req->timer == NULL) {
+        if (req->dnssim->free_after_use) {
+            core_object_payload_free(req->payload);
+        }
+        core_object_dns_free(req->dns_q);
+        free(req);
+    }
+}
+
+static void _close_query(_output_dnssim_query_t* qry)
+{
+    mlassert(qry, "qry is nil");
+
+    switch (qry->transport) {
+    case OUTPUT_DNSSIM_TRANSPORT_UDP:
+        _output_dnssim_close_query_udp((_output_dnssim_query_udp_t*)qry);
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_TCP:
+        _output_dnssim_close_query_tcp((_output_dnssim_query_tcp_t*)qry);
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_TLS:
+#if GNUTLS_VERSION_NUMBER >= DNSSIM_MIN_GNUTLS_VERSION
+        _output_dnssim_close_query_tls((_output_dnssim_query_tcp_t*)qry);
+#else
+        mlfatal(DNSSIM_MIN_GNUTLS_ERRORMSG);
+#endif
+        break;
+    case OUTPUT_DNSSIM_TRANSPORT_HTTPS2:
+#if GNUTLS_VERSION_NUMBER >= DNSSIM_MIN_GNUTLS_VERSION
+        _output_dnssim_close_query_https2((_output_dnssim_query_tcp_t*)qry);
+#else
+        mlfatal(DNSSIM_MIN_GNUTLS_ERRORMSG);
+#endif
+        break;
+    default:
+        mlfatal("invalid query transport");
+        break;
+    }
+}
+
+static void _on_request_timer_closed(uv_handle_t* handle)
+{
+    _output_dnssim_request_t* req = (_output_dnssim_request_t*)handle->data;
+    mlassert(req, "req is nil");
+    free(handle);
+    req->timer = NULL;
+    _output_dnssim_maybe_free_request(req);
+}
+
+static void _close_request(_output_dnssim_request_t* req)
+{
+    if (req == NULL || req->state == _OUTPUT_DNSSIM_REQ_CLOSING)
+        return;
+    mlassert(req->state == _OUTPUT_DNSSIM_REQ_ONGOING, "request to be closed must be ongoing");
+    req->state = _OUTPUT_DNSSIM_REQ_CLOSING;
+    req->dnssim->ongoing--;
+
+    /* Calculate latency. */
+    uint64_t latency;
+    req->ended_at = uv_now(&((_output_dnssim_t*)req->dnssim)->loop);
+    latency       = req->ended_at - req->created_at;
+    if (latency > req->dnssim->timeout_ms) {
+        req->ended_at = req->created_at + req->dnssim->timeout_ms;
+        latency       = req->dnssim->timeout_ms;
+    }
+    req->stats->latency[latency]++;
+    req->dnssim->stats_sum->latency[latency]++;
+
+    if (req->timer != NULL) {
+        uv_timer_stop(req->timer);
+        uv_close((uv_handle_t*)req->timer, _on_request_timer_closed);
+    }
+
+    /* Finish any queries in flight. */
+    _output_dnssim_query_t* qry = req->qry;
+    if (qry != NULL)
+        _close_query(qry);
+
+    _output_dnssim_maybe_free_request(req);
+}
+
+void _output_dnssim_request_answered(_output_dnssim_request_t* req, core_object_dns_t* msg)
+{
+    mlassert(req, "req is nil");
+    mlassert(msg, "msg is nil");
+
+    req->dnssim->stats_sum->answers++;
+    req->stats->answers++;
+
+    switch (msg->rcode) {
+    case CORE_OBJECT_DNS_RCODE_NOERROR:
+        req->dnssim->stats_sum->rcode_noerror++;
+        req->stats->rcode_noerror++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_FORMERR:
+        req->dnssim->stats_sum->rcode_formerr++;
+        req->stats->rcode_formerr++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_SERVFAIL:
+        req->dnssim->stats_sum->rcode_servfail++;
+        req->stats->rcode_servfail++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_NXDOMAIN:
+        req->dnssim->stats_sum->rcode_nxdomain++;
+        req->stats->rcode_nxdomain++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_NOTIMP:
+        req->dnssim->stats_sum->rcode_notimp++;
+        req->stats->rcode_notimp++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_REFUSED:
+        req->dnssim->stats_sum->rcode_refused++;
+        req->stats->rcode_refused++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_YXDOMAIN:
+        req->dnssim->stats_sum->rcode_yxdomain++;
+        req->stats->rcode_yxdomain++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_YXRRSET:
+        req->dnssim->stats_sum->rcode_yxrrset++;
+        req->stats->rcode_yxrrset++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_NXRRSET:
+        req->dnssim->stats_sum->rcode_nxrrset++;
+        req->stats->rcode_nxrrset++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_NOTAUTH:
+        req->dnssim->stats_sum->rcode_notauth++;
+        req->stats->rcode_notauth++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_NOTZONE:
+        req->dnssim->stats_sum->rcode_notzone++;
+        req->stats->rcode_notzone++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADVERS:
+        req->dnssim->stats_sum->rcode_badvers++;
+        req->stats->rcode_badvers++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADKEY:
+        req->dnssim->stats_sum->rcode_badkey++;
+        req->stats->rcode_badkey++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADTIME:
+        req->dnssim->stats_sum->rcode_badtime++;
+        req->stats->rcode_badtime++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADMODE:
+        req->dnssim->stats_sum->rcode_badmode++;
+        req->stats->rcode_badmode++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADNAME:
+        req->dnssim->stats_sum->rcode_badname++;
+        req->stats->rcode_badname++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADALG:
+        req->dnssim->stats_sum->rcode_badalg++;
+        req->stats->rcode_badalg++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADTRUNC:
+        req->dnssim->stats_sum->rcode_badtrunc++;
+        req->stats->rcode_badtrunc++;
+        break;
+    case CORE_OBJECT_DNS_RCODE_BADCOOKIE:
+        req->dnssim->stats_sum->rcode_badcookie++;
+        req->stats->rcode_badcookie++;
+        break;
+    default:
+        req->dnssim->stats_sum->rcode_other++;
+        req->stats->rcode_other++;
+    }
+
+    _close_request(req);
+}
+
+void _output_dnssim_on_uv_alloc(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf)
+{
+    mlfatal_oom(buf->base = malloc(suggested_size));
+    buf->len = suggested_size;
+}