From 043c51c8992026d78d273158e418bec055d03365 Mon Sep 17 00:00:00 2001
From: mrbesen <y.g.2@gmx.de>
Date: Sat, 17 Apr 2021 19:51:08 +0200
Subject: [PATCH] added server

---
 server.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 server.c

diff --git a/server.c b/server.c
new file mode 100644
index 0000000..09aaf3c
--- /dev/null
+++ b/server.c
@@ -0,0 +1,103 @@
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+
+
+bool shouldrun = true;
+int fd = -1;
+
+void sighand(int sig) {
+	shouldrun = false;
+	close(fd);
+}
+
+int main(int argc, char** argv) {
+
+
+	int port = 2223;
+
+	if(argc < 2) {
+		fprintf(stderr, "Usage: %s <logfile> [port]", argv[0]);
+		return 1;
+	}
+
+	char* logfile = argv[1];
+
+	if(argc > 2) {
+		port = atoi(argv[2]);
+	}
+
+	//create socket
+	fd = socket(AF_INET, SOCK_STREAM, 0);
+	if(fd < 0) {
+		fprintf(stderr, "could not create socket\n");
+		return 1;
+	}
+
+	//ignore errors
+	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &(int){1}, sizeof(int));
+
+	struct sockaddr_in bindaddr;
+	bindaddr.sin_family = AF_INET;
+	bindaddr.sin_addr.s_addr = INADDR_ANY;
+	bindaddr.sin_port = htons( port );
+	if(bind(fd, &bindaddr, sizeof(struct sockaddr_in))) {
+		fprintf(stderr, "Bind failed\n");
+		return 1;
+	}
+
+	if(listen(fd, 5)) {
+		fprintf(stderr, "listen failed\n");
+		return 1;
+	}
+
+	signal(SIGINT, sighand);
+
+	while(shouldrun) {
+		struct sockaddr_in clientaddr;
+		socklen_t caddrlen = 0;
+		int client = accept(fd, (struct sockaddr *)&clientaddr, (socklen_t*)&caddrlen);
+		if(client < 0) {
+			fprintf(stderr, "accept failed\n");
+			continue;
+		}
+
+		//open THE file
+		int file = open(logfile, O_RDONLY);
+		if(file < 0) {
+			fprintf(stderr, "Cannot open logfile\n");
+			close(client);
+			continue;
+		}
+
+		//jump to the end
+		lseek(file, -sizeof(time_t), SEEK_END);
+
+		//read
+		time_t data;
+		size_t readc = read(file, &data, sizeof(time_t));
+		if(readc != sizeof(time_t)) {
+			fprintf(stderr, "could not read logfile\n");
+			close(file);
+			close(client);
+			continue;
+		}
+
+		size_t writec = write(client, &data, sizeof(time_t));
+		if(writec != sizeof(time_t)) {
+			fprintf(stderr, "could not read logfile\n");
+		}
+
+		close(file);
+		close(client);
+	}
+
+	return 0;
+}
\ No newline at end of file