Added basic template for server - accepting connnections, command line

arguments, etc

src/wstationd.c

@@ -0,0 +1,123 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <libgen.h>
+#include <getopt.h>
+#include "wstationd.h"
+
+
+static char *exec_name;
+
+
+static void print_help()
+{
+	fprintf(stdout, "usage: %s\n", exec_name);
+	fprintf(stdout, "  -p, --port <port>     Port to listen on (default: 10800)\n");
+	fprintf(stdout, "  -b, --bind <address>  Address to bind to (default: 0.0.0.0)\n");
+	fprintf(stdout, "  -h, --help            Print this message and exit\n");
+	fprintf(stdout, "  -v, --version         Print version and exit\n");
+}
+
+
+int main(int argc, char *argv[])
+{
+	const struct option longopts[] = {
+		{ "port", required_argument, NULL, 'p' },
+		{ "bind", required_argument, NULL, 'b' },
+		{ "version", no_argument, NULL, 'v' },
+		{ "help", no_argument, NULL, 'h' },
+		{ NULL, 0, NULL, 0 }
+	};
+
+	exec_name = basename(argv[0]);
+
+	int flag = 1;
+	int sockfd = 0, connfd = 0;
+	int port = 10800;
+	uint32_t addr = INADDR_ANY;
+
+	for(int ch; (ch = getopt_long(argc, argv, "b:p:vh", longopts, NULL)) != -1;){
+		switch(ch){
+			case 'p':
+				port = (int)strtol(optarg, NULL, 10);
+				if(port < 1 || port > 65535){
+					fprintf(stderr, "%s: invalid port number\n", exec_name);
+					print_help();
+					goto shutdown_error;
+				}
+			break;
+
+			case 'b':
+				if(inet_pton(AF_INET, optarg, &addr) == -1){
+					fprintf(stderr, "%s: invalid bind address\n", exec_name);
+					print_help();
+					goto shutdown_error;
+				}
+			break;
+
+			case 'v':
+				fprintf(stdout, "wstationd v%s (%s %s)\n", VERSION,__DATE__, __TIME__);
+			goto shutdown_clean;
+
+			case '?':
+			case 'h':
+				print_help();
+			goto shutdown_clean;
+		}
+	}
+
+	sockfd = socket(AF_INET, SOCK_STREAM, 0);
+	if(sockfd == -1){
+		fprintf(stderr, "%s: cannot open socket - %s\n",
+			exec_name, strerror(errno)
+		);
+		goto shutdown_error;
+	}
+
+	setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
+
+	struct sockaddr_in sockin;
+	memset(&sockin, 0, sizeof(sockin));
+	sockin.sin_family = AF_INET;
+	sockin.sin_addr.s_addr = addr;
+	sockin.sin_port = htons(port);
+
+	if(bind(sockfd, (struct sockaddr*)&sockin, sizeof(sockin)) < 0){
+		fprintf(stderr, "%s: cannot bind to port - %s\n",
+			exec_name, strerror(errno)
+		);
+		goto shutdown_error;
+	}
+
+	if(listen(sockfd, 10) != 0){
+		fprintf(stderr, "%s: cannot listen - %s\n",
+			exec_name, strerror(errno)
+		);
+		goto shutdown_error;
+	}
+
+	connfd = accept(sockfd, NULL, NULL);
+	if(connfd == -1){
+		fprintf(stderr, "%s: connection failed - %s\n",
+			exec_name, strerror(errno)
+		);
+		goto shutdown_error;
+	}
+
+	shutdown_clean:
+	if(connfd > 0) close(connfd);
+	if(sockfd > 0) close(sockfd);
+	return 0;
+
+	shutdown_error:
+	if(connfd > 0) close(connfd);
+	if(sockfd > 0) close(sockfd);
+	return 1;
+}

src/wstationd.h

@@ -0,0 +1 @@
+#define VERSION "0.1.0"