From aa37c682e84e2734c32016160f37bd91b2d5bd14 Mon Sep 17 00:00:00 2001
From: rofl0r <retnyg@gmx.net>
Date: Wed, 1 Mar 2017 16:12:20 +0000
Subject: [PATCH] add reusable server component

---
 server.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 server.h | 28 ++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 server.c
 create mode 100644 server.h

diff --git a/server.c b/server.c
new file mode 100644
index 0000000..a71de3d
--- /dev/null
+++ b/server.c
@@ -0,0 +1,46 @@
+#include "server.h"
+#include <stdio.h>
+#include <unistd.h>
+
+int resolve(const char *host, unsigned short port, struct addrinfo** addr) {
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_STREAM,
+		.ai_flags = AI_PASSIVE,
+	};
+	char port_buf[8];
+	snprintf(port_buf, sizeof port_buf, "%u", port);
+	return getaddrinfo(host, port_buf, &hints, addr);
+}
+
+int server_waitclient(struct server *server, struct client* client) {
+	socklen_t clen = sizeof client->addr;
+	return ((client->fd = accept(server->fd, (void*)&client->addr, &clen)) == -1)*-1;
+}
+
+int server_setup(struct server *server, const char* listenip, unsigned short port) {
+	struct addrinfo *ainfo = 0;
+	if(resolve(listenip, port, &ainfo)) return -1;
+	struct addrinfo* p;
+	int listenfd;
+	for(p = ainfo; p; p = p->ai_next) {
+		if((listenfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) < 0)
+			continue;
+		int yes = 1;
+		setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
+		if(bind(listenfd, p->ai_addr, p->ai_addrlen) < 0) {
+			close(listenfd);
+			listenfd = -1;
+			continue;
+		}
+		break;
+	}
+	if(listenfd < 0) return -2;
+	freeaddrinfo(ainfo);
+	if(listen(listenfd, SOMAXCONN) < 0) {
+		close(listenfd);
+		return -3;
+	}
+	server->fd = listenfd;
+	return 0;
+}
diff --git a/server.h b/server.h
new file mode 100644
index 0000000..477052c
--- /dev/null
+++ b/server.h
@@ -0,0 +1,28 @@
+#ifndef SERVER_H
+#define SERVER_H
+
+#include <sys/socket.h>
+#include <netdb.h>
+
+//RcB: DEP "server.c"
+
+union sockaddr_union {
+	struct sockaddr_in  v4;
+	struct sockaddr_in6 v6;
+};
+
+struct client {
+	union sockaddr_union addr;
+	int fd;
+};
+
+struct server {
+	int fd;
+};
+
+int resolve(const char *host, unsigned short port, struct addrinfo** addr);
+int server_waitclient(struct server *server, struct client* client);
+int server_setup(struct server *server, const char* listenip, unsigned short port);
+
+#endif
+
-- 
2.11.4.GIT