From be956cd27353a4bb585b1a648e8469cf7adb5edf Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 14 Jan 2022 16:03:48 +0100
Subject: Adding upstream version 0.2.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 examples/client_receiver_uv.c | 134 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 examples/client_receiver_uv.c

(limited to 'examples/client_receiver_uv.c')

diff --git a/examples/client_receiver_uv.c b/examples/client_receiver_uv.c
new file mode 100644
index 0000000..0454ba2
--- /dev/null
+++ b/examples/client_receiver_uv.c
@@ -0,0 +1,134 @@
+#include <dnswire/reader.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <uv.h>
+#include <arpa/inet.h>
+#include <time.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "print_dnstap.c"
+
+#define BUF_SIZE 4096
+
+uv_loop_t*   loop;
+uv_tcp_t     sock;
+uv_connect_t conn;
+char         rbuf[BUF_SIZE];
+
+struct dnswire_reader reader;
+
+void client_alloc_buffer(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf)
+{
+    buf->base = rbuf;
+    buf->len  = sizeof(rbuf);
+}
+
+void client_read(uv_stream_t* handle, ssize_t nread, const uv_buf_t* buf)
+{
+    if (nread > 0) {
+        /*
+         * We now push all the data we got to the reader.
+         */
+        size_t pushed = 0;
+
+        while (pushed < nread) {
+            enum dnswire_result res = dnswire_reader_push(&reader, (uint8_t*)&buf->base[pushed], nread - pushed, 0, 0);
+
+            pushed += dnswire_reader_pushed(reader);
+
+            switch (res) {
+            case dnswire_have_dnstap:
+                /*
+                 * We got a DNSTAP message, lets print it!
+                 */
+                print_dnstap(dnswire_reader_dnstap(reader));
+                break;
+            case dnswire_again:
+            case dnswire_need_more:
+                break;
+            case dnswire_endofdata:
+                /*
+                 * The remote end sent a control stop or finish.
+                 */
+                uv_close((uv_handle_t*)handle, 0);
+                return;
+            default:
+                fprintf(stderr, "dnswire_reader_fread() error\n");
+                uv_close((uv_handle_t*)handle, 0);
+                return;
+            }
+        }
+    }
+    if (nread < 0) {
+        if (nread != UV_EOF) {
+            fprintf(stderr, "client_read() error: %s\n", uv_err_name(nread));
+        } else {
+            printf("disconnected\n");
+        }
+        uv_close((uv_handle_t*)handle, 0);
+    }
+}
+
+void on_connect(uv_connect_t* req, int status)
+{
+    /*
+     * We have connected to the sender, check that there was no errors
+     * and start receiving incoming frames.
+     */
+
+    if (status < 0) {
+        fprintf(stderr, "on_connect() error: %s\n", uv_strerror(status));
+        return;
+    }
+
+    uv_read_start((uv_stream_t*)&sock, client_alloc_buffer, client_read);
+}
+
+int main(int argc, const char* argv[])
+{
+    if (argc < 3) {
+        fprintf(stderr, "usage: client_receiver_uv <IP> <port>\n");
+        return 1;
+    }
+
+    /*
+     * We first initialize the reader and check that it can allocate the
+     * buffers it needs.
+     */
+
+    if (dnswire_reader_init(&reader) != dnswire_ok) {
+        fprintf(stderr, "Unable to initialize dnswire reader\n");
+        return 1;
+    }
+
+    /*
+     * We set this reader to reject bidirectional communication.
+     */
+    if (dnswire_reader_allow_bidirectional(&reader, false) != dnswire_ok) {
+        fprintf(stderr, "Unable to deny bidirectional communication\n");
+        return 1;
+    }
+
+    /*
+     * We setup a TCP client using libuv and connect to the given server.
+     */
+
+    struct sockaddr_storage addr;
+    int                     port = atoi(argv[2]);
+
+    if (strchr(argv[1], ':')) {
+        uv_ip6_addr(argv[1], port, (struct sockaddr_in6*)&addr);
+    } else {
+        uv_ip4_addr(argv[1], port, (struct sockaddr_in*)&addr);
+    }
+
+    loop = uv_default_loop();
+
+    uv_tcp_init(loop, &sock);
+    uv_tcp_connect(&conn, &sock, (const struct sockaddr*)&addr, on_connect);
+
+    return uv_run(loop, UV_RUN_DEFAULT);
+}
-- 
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