init project

1 files changed, 107 insertions, 0 deletions

diff --git a/src/client/client.cpp b/src/client/client.cpp
new file mode 100644
index 0000000..f09b349
--- /dev/null
+++ b/src/client/client.cpp
@@ -0,0 +1,107 @@
+#include <unistd.h> // for close
+#include <string>
+#include <cstring>
+#include <netinet/in.h> // sockaddr_in
+#include <sys/types.h> // for bind, connect
+#include <sys/socket.h> // for bind, connect
+#include <netinet/in.h> // for iten_aton, iten_ntoa
+#include <arpa/inet.h> // for iten_aton, iten_ntoa
+#include <fcntl.h> // for fcntl
+
+#define SERVER_IP "127.0.0.1"
+static int port = 7777;
+
+int main(int argc, char *argv[])
+{
+	int client = socket(AF_INET, SOCK_STREAM, 0);
+	if(client == -1) {
+		perror("socket");
+		return 1;
+	}
+
+	// remove "port sticking" aka socket in TIME_WAIT
+	int opt = 1;
+	setsockopt(client, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+	/* call bind optional, the system chooses
+		the address automatically */
+
+	struct sockaddr_in server_adress;
+	server_adress.sin_family = AF_INET;
+	server_adress.sin_port = htons(port);
+	if(!inet_aton(SERVER_IP, &(server_adress.sin_addr))) {
+		perror("inet_aton");
+		return 1;
+	}
+	
+	int res = connect(client, (struct sockaddr*) &server_adress,
+		sizeof(server_adress));
+	if(res == -1) {
+		perror("connect");
+		return 1;
+	}
+
+	printf("=> Connection to server %s with port number: %d\n",
+		inet_ntoa(server_adress.sin_addr), port);
+
+	// work with server
+	char buffer[1024];
+	memset(buffer, 0, sizeof(buffer)); // clear
+
+	int fd_stdin = STDIN_FILENO;
+	const int flags = fcntl(fd_stdin, F_GETFL, 0);
+	fcntl(fd_stdin, F_SETFL, flags | O_NONBLOCK);
+
+	bool exit = false;
+	do {
+		struct timeval *timeout;
+		timeout->tv_sec = 0;
+		timeout->tv_usec = 5000000;
+
+		fd_set rds, wrs;
+		FD_ZERO(&rds);
+		FD_ZERO(&wrs);
+
+		FD_SET(client, &rds);
+
+		int val = read(fd_stdin, buffer, sizeof(buffer));
+		if(val > 0) FD_SET(fd_stdin, &wrs);
+
+		res = select(client+1, &rds, &wrs, 0, timeout);
+		if(res < 0) {
+			if(errno == EINTR)
+				continue;
+			else {
+				perror("select");
+				break;
+			}
+		}
+
+		if(res > 0) {
+			if(FD_ISSET(fd_stdin, &wrs)) // if client want to send any message
+			{
+				if(buffer[0] == '#') // exit
+					exit = true;
+				else write(client, buffer, strlen(buffer)*sizeof(char));
+
+				memset(buffer, 0, sizeof(buffer)); // clear
+			}
+			if(FD_ISSET(client, &rds)) // if server want to send any message
+			{
+				read(client, buffer, sizeof(buffer));
+
+				printf("%s", buffer);
+				getchar(); /* FIXME: if you remove this thing,
+					then output will not be produced only
+					if you add '\n' to the end of the line */
+
+				memset(buffer, 0, sizeof(buffer)); // clear
+			}
+		}
+	} while (!exit);
+
+	printf("=> GoodBye...\n");
+
+	close(client);
+	return 0;
+}
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