From db66484c4300f5f0e857eff01d15fd3593002a79 Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Fri, 5 Jun 2020 14:09:18 +0200
Subject: Initial commit

---
 stest.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 stest.c

(limited to 'stest.c')

diff --git a/stest.c b/stest.c
new file mode 100644
index 0000000..d60ae74
--- /dev/null
+++ b/stest.c
@@ -0,0 +1,102 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdbool.h>
+
+#define PIPE_RD 0
+#define PIPE_WR 1
+
+int
+main(int argc, char **argv) {
+	int sfd;
+	struct sockaddr_in addr;
+	socklen_t addrsz = sizeof(addr);
+	int pfd[2];
+	int r;
+	int cfd;
+	int zfd;
+	size_t total = 0;
+
+	if (argc != 3) {
+		fprintf(stderr, "Usage: %s <addr> <port>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	sfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (sfd < 0) {
+		perror("socket");
+		exit(EXIT_FAILURE);
+	}
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(atoi(argv[2]));
+	addr.sin_addr.s_addr = inet_addr(argv[1]);
+
+	int enable = 1;
+	if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
+		perror("setsockopt");
+		exit(EXIT_FAILURE);
+	}
+
+	r = bind(sfd, (struct sockaddr *)&addr, sizeof(addr));
+	if (r < 0) {
+		perror("bind");
+		exit(EXIT_FAILURE);
+	}
+
+	r = listen(sfd, 100);
+	if (r < 0) {
+		perror("listen");
+		exit(EXIT_FAILURE);
+	}
+
+	cfd = accept4(sfd, (struct sockaddr *)&addr, &addrsz, SOCK_CLOEXEC);
+	if (cfd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	zfd = open("/dev/null", O_WRONLY | O_CLOEXEC);
+	if (zfd < 0) {
+		perror("open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (pipe2(pfd, O_CLOEXEC) < 0) {
+		perror("pipe2");
+		exit(EXIT_FAILURE);
+	}
+
+	while (true) {
+		ssize_t r, w;
+
+		r = splice(cfd, NULL, pfd[PIPE_WR], NULL, 64 * 1024, SPLICE_F_MOVE);
+		if (r < 0)
+			perror("splice");
+		//fprintf(stderr, "Read %zi bytes from socket\n", r);
+		if (r == 0)
+			break;
+		w = splice(pfd[PIPE_RD], NULL, zfd, NULL, r, SPLICE_F_MOVE);
+		if (w < 0)
+			perror("splice");
+		if (w != r) {
+			fprintf(stderr, "Losing bytes\n");
+			exit(EXIT_FAILURE);
+		}
+		//fprintf(stderr, "Wrote %zi bytes to /dev/null\n", r);
+
+		total += w;
+	}
+
+	printf("Server: received %zu bytes\n", total);
+}
+
-- 
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