nishidy/server.c

## server.c
#include <stdio.h> //printf(), fprintf(), perror()
#include <sys/socket.h> //socket(), connect(), recv()
#include <arpa/inet.h> // struct sockaddr_in, struct sockaddr, inet_ntoa(), inet_aton()
#include <stdlib.h> //atoi(), exit(), EXIT_FAILURE, EXIT_SUCCESS
#include <string.h> //memset()
#include <unistd.h> //close()
#include <linux/tcp.h> //TCP_DEFER_ACCEPT
#include <time.h> //

#define MSGSIZE 32
#define MAX_MSGSIZE 1024
#define BUFSIZE (MSGSIZE + 1)

#define QUEUELIMIT 5

int main(int argc, char *argv[]){

	int servSock;
	struct sockaddr_in servSockAddr;
	char recvBuffer[BUFSIZE];
	char sendBuffer[BUFSIZE];
	int byteRcvd;

	int clientSock;
	struct sockaddr_in clientSockAddr;
	unsigned int clientLen;

	unsigned int recvLen, sendLen;

	int defer = 1;

	time_t curtime;

	FILE *fp;
	char buf[BUFSIZE];

	if((servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
		perror("socket() failed");
		exit(EXIT_FAILURE);
	}

	memset(&servSockAddr, 0, sizeof(servSockAddr));

	servSockAddr.sin_family = AF_INET;
	servSockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servSockAddr.sin_port = htons(8080);

	if(bind(servSock, (struct sockaddr *) &servSockAddr, sizeof(servSockAddr)) < 0){
		perror("bind() failed.");
		exit(EXIT_FAILURE);
	}

	if(listen(servSock, QUEUELIMIT)<0){
		perror("listen() failed.");
		exit(EXIT_FAILURE);
	}

	setsockopt(servSock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &defer, sizeof(defer) );

	while(1){
		if((clientSock = accept(servSock, (struct sockaddr *) &clientSockAddr, &clientLen))<0){
			perror("accept() failed.");
			exit(EXIT_FAILURE);
		}

		curtime = time(NULL);
		//printf("[%s] accept() unblocked.\n",ctime(&curtime));
		if( (fp = popen("date +%T.%3N","r")) == NULL){
			perror("popen() failed.");
			exit(EXIT_FAILURE);
		}
		fgets(buf, BUFSIZE, fp);
		buf[strlen(buf)-1]='\0';
		printf("[%s] accept() unblocked.\n",buf);

		while(1){
			if((recvLen = recv(clientSock, recvBuffer, BUFSIZE, 0)) < 0){
				printf("recv() failed.");
				exit(EXIT_FAILURE);
			} else if (recvLen == 0){
				printf("connection closed by foreign host.\n");
				break;
			}

			if( (fp = popen("date +%T.%3N","r")) == NULL){
				perror("popen() failed.");
				exit(EXIT_FAILURE);
			}
			fgets(buf, BUFSIZE, fp);
			buf[strlen(buf)-1]='\0';
			printf("[%s] received: %s\n",buf,recvBuffer);

			sprintf(sendBuffer, "HTTP/1.1 200 OK");
			if((sendLen = send(clientSock, sendBuffer, strlen(sendBuffer), 0)) < 0){
				perror("send() failed.");
				exit(EXIT_FAILURE);
			} else if (sendLen == 0){
				printf("connection closed by foreign host.\n");
				break;
			}
		}

		close(clientSock);
	}

	return 0;
}
	#include <stdio.h> //printf(), fprintf(), perror()
	#include <sys/socket.h> //socket(), connect(), recv()
	#include <arpa/inet.h> // struct sockaddr_in, struct sockaddr, inet_ntoa(), inet_aton()
	#include <stdlib.h> //atoi(), exit(), EXIT_FAILURE, EXIT_SUCCESS
	#include <string.h> //memset()
	#include <unistd.h> //close()
	#include <linux/tcp.h> //TCP_DEFER_ACCEPT
	#include <time.h> //

	#define MSGSIZE 32
	#define MAX_MSGSIZE 1024
	#define BUFSIZE (MSGSIZE + 1)

	#define QUEUELIMIT 5

	int main(int argc, char *argv[]){

	int servSock;
	struct sockaddr_in servSockAddr;
	char recvBuffer[BUFSIZE];
	char sendBuffer[BUFSIZE];
	int byteRcvd;

	int clientSock;
	struct sockaddr_in clientSockAddr;
	unsigned int clientLen;

	unsigned int recvLen, sendLen;

	int defer = 1;

	time_t curtime;

	FILE *fp;
	char buf[BUFSIZE];

	if((servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
	perror("socket() failed");
	exit(EXIT_FAILURE);
	}

	memset(&servSockAddr, 0, sizeof(servSockAddr));

	servSockAddr.sin_family = AF_INET;
	servSockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servSockAddr.sin_port = htons(8080);

	if(bind(servSock, (struct sockaddr *) &servSockAddr, sizeof(servSockAddr)) < 0){
	perror("bind() failed.");
	exit(EXIT_FAILURE);
	}

	if(listen(servSock, QUEUELIMIT)<0){
	perror("listen() failed.");
	exit(EXIT_FAILURE);
	}

	setsockopt(servSock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &defer, sizeof(defer) );

	while(1){
	if((clientSock = accept(servSock, (struct sockaddr *) &clientSockAddr, &clientLen))<0){
	perror("accept() failed.");
	exit(EXIT_FAILURE);
	}

	curtime = time(NULL);
	//printf("[%s] accept() unblocked.\n",ctime(&curtime));
	if( (fp = popen("date +%T.%3N","r")) == NULL){
	perror("popen() failed.");
	exit(EXIT_FAILURE);
	}
	fgets(buf, BUFSIZE, fp);
	buf[strlen(buf)-1]='\0';
	printf("[%s] accept() unblocked.\n",buf);

	while(1){
	if((recvLen = recv(clientSock, recvBuffer, BUFSIZE, 0)) < 0){
	printf("recv() failed.");
	exit(EXIT_FAILURE);
	} else if (recvLen == 0){
	printf("connection closed by foreign host.\n");
	break;
	}

	if( (fp = popen("date +%T.%3N","r")) == NULL){
	perror("popen() failed.");
	exit(EXIT_FAILURE);
	}
	fgets(buf, BUFSIZE, fp);
	buf[strlen(buf)-1]='\0';
	printf("[%s] received: %s\n",buf,recvBuffer);

	sprintf(sendBuffer, "HTTP/1.1 200 OK");
	if((sendLen = send(clientSock, sendBuffer, strlen(sendBuffer), 0)) < 0){
	perror("send() failed.");
	exit(EXIT_FAILURE);
	} else if (sendLen == 0){
	printf("connection closed by foreign host.\n");
	break;
	}
	}

	close(clientSock);
	}

	return 0;
	}