First commit of Unix socket chat application

Author: ibipul

GPL-v2-license.txt

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+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+For the complete terms of the GNU General Public License, please see this URL:
+http://www.gnu.org/licenses/gpl-2.0.html

README.md

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+Author:
+
+ - Bipul Islam
+ 
+---
+##Unix Socet IPC Implementation
+
+We use socket programming for inter process communications to design a simple console based chat application.
+
+###Contents:
+ - chatserv.c (Contains server code, on execution sets up the server to listen for connections)
+ - charcli.c (Contains client code, set your server IP in the code it will connect to the server, use 127.0.0.1 to test on localhost)
+
+###Usage:
+```
+gcc chatserv.c -o serv
+gcc chatcli.c -o cli
+./serv
+```
+(in a new tab)
+```
+./cli
+```
+Then chat away!
+
+#####Notes: 
+*It's possible to generalize both server and client by accepting the ip of the machines in command line, or even supply server ip to client in commadline.*

chatcli.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+
+main()
+{
+	
+	struct sockaddr_in servaddr, myaddr;
+	struct sockaddr_in client;
+        int sockid;
+	int connectid;
+	int newsockid;
+	int clientlen;
+
+	char msg_snd[100];//="Indian Statistical Institute";
+	char msg_rcv[100];
+	int sendid,recvid;
+	int port_id = 6000;
+
+
+	sockid = socket(AF_INET, SOCK_STREAM, 0);
+
+	bzero((char*)&servaddr, sizeof(struct sockaddr_in));
+	servaddr.sin_family = AF_INET;
+	servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");// 192.168.23.44
+	servaddr.sin_port = htons(port_id);
+	
+	connectid = connect(sockid, (struct sockaddr*)&servaddr, sizeof(struct sockaddr_in));
+	if(connectid < 0)
+	 printf("error connecting \n");
+	while(1){
+	
+		printf("(you)Guest::\n");
+
+		gets(msg_snd);
+		sendid = sendto(sockid, msg_snd, 100, 0, (struct sockaddr*)&servaddr, sizeof(struct sockaddr_in));
+		if(sendid < 0)
+		printf("error sending\n");
+
+		recvid = recvfrom(sockid, msg_rcv, 100, 0, (struct sockaddr*)&servaddr, &clientlen);
+		if(recvid < 0)
+			printf("error recieving\n");
+
+		printf("server:: %s \n", msg_rcv);
+
+	}
+	return 0;
+}

chatserv.c

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+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+
+main()
+{
+	
+	struct sockaddr_in myaddr;
+	struct sockaddr_in client;
+        int sockid,sendid;
+	int bindid;
+	int newsockid;
+	int clientlen;
+
+	char msg_rcv[100];
+	char msg_snd[100];
+	int recvid;
+	int port_id = 6000;
+
+
+	sockid = socket(AF_INET, SOCK_STREAM, 0);
+
+	bzero((char*)&myaddr, sizeof(struct sockaddr));
+	myaddr.sin_family = AF_INET;
+	myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+	myaddr.sin_port = htons(port_id);
+	
+	bindid = bind(sockid, (struct sockaddr*)&myaddr, sizeof(struct sockaddr_in));
+	if(bindid < 0)
+		printf("error \n");
+
+	listen(sockid, 5);
+	clientlen = sizeof(struct sockaddr_in);
+
+		newsockid = accept(sockid, (struct sockaddr*)&myaddr, &clientlen);
+		if(newsockid < 0)
+			printf("error accepting\n");
+
+	while(1) {
+		
+		printf("(you)Server::\n");
+		recvid = recvfrom(newsockid, msg_rcv, 100, 0, (struct sockaddr*)&myaddr, &clientlen);
+		if(recvid < 0)
+			printf("error recieving\n");
+
+		printf("Guest:: %s \n", msg_rcv);
+		gets(msg_snd);
+		sendid = sendto(newsockid, msg_snd, 100, 0, (struct sockaddr*)&myaddr, sizeof(struct sockaddr_in));
+		if(sendid < 0)
+		printf("error Sending\n");
+		
+
+
+	}
+
+	return 0;
+}