《TCP/IP网络编程》第5章

• Linux计算器服务器端
• Linux计算器客户端
• Windows计算器服务器端
• Windows计算器客户端

Linux计算器服务器端

op_server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
#define OPSZ 4
void error_handling(char *message);
int calculate(int opnum, int opnds[], char oprator);

int main(int argc, char *argv[]) {
	int serv_sock;
	int clnt_sock;
	char opinfo[BUF_SIZE];
	int result;
	int opnc_cnt;
	int i;
	int recv_len;
	int recv_cnt;

	struct sockaddr_in serv_addr;
	struct sockaddr_in clnt_addr;
	socklen_t addr_size;

	if(argc!=2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	serv_sock = socket(PF_INET, SOCK_STREAM, 0);
	if(serv_sock==-1)
		error_handling("socket() error");

	addr_size = sizeof(struct sockaddr_in);
	
	memset(&serv_addr, 0, addr_size);
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	serv_addr.sin_port = htons(atoi(argv[1]));
	
	if(bind(serv_sock, (struct sockaddr*)&serv_addr, addr_size)==-1)
		error_handling("bind() error");
		
	if(listen(serv_sock, 5)==-1)
		error_handling("listen() error");
		
	for(i=0; i<5; i++) {
		opnd_cnt = 0;
		clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &addr_size);
		if(clnt_sock==-1)
			error_handling("accept() error");
		else
			printf("Connected client %d\n", i+1);
		
		//接收一个字节，数值个数
		read(clnt_sock, &opnd_cnt, 1);
			
		recv_len = 0;
		//接收opnd_cnt个数值+1个运算符
		while(recv_len<OPSZ*opnd_cnt+1) {
			recv_cnt = read(clnt_sock, &opinfo[recv_len], BUF_SIZE-1);
			recv_len += recv_cnt;
		}
	
		result = calculate(opnd_cnt, (int*)opinfo, opinfo[recv_len-1);
		write(clnt_sock, (char *)result, sizeof(result));
			
		close(clnt_sock);
	}
	
	close(serv_sock);
	return 0;
}

int calculate(int opnum, int opnds[], char op) {
	int result = opnds[0], i;
	switch(op) {
	case '+':
		for(i=1; i<opnum; i++)
			result += opnds[i];
		break;
	case '-':
		for(i=1; i<opnum; i++)
			result -= opnds[i];
		break;
	case '*':
		for(i=1; i<opnum; i++)
			result *= opnds[i];
		break;
	}
	return result;
}

void error_handling(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

gcc op_server.c -o opserver
./opserver 9190

Linux计算器客户端

op_client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
#define RLT_SIZE 4
#define OPSZ 4
void error_handling(char *message);

int main(int argc, char *argv[]) {
	int sock;
	char opmsg[BUF_SIZE];
	int result;
	int opnd_cnt;
	int i;

	struct sockaddr_in addr;
	socklen_t addr_size;
	
	if(argc!=3) {
		printf("Usage : %s <IP> <port>\n", argv[0]);
		exit(1);
	}

	sock = socket(PF_INET, SOCK_STREAM, 0);
	if(sock==-1)
		error_handling("socket() error");

	addr_size = sizeof(addr);
	
	memset(&addr, 0, addr_size);
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = inet_addr(argv[1]);
	addr.sin_port = htons(atoi(argv[2]));
	
	if(connect(sock, (struct sockaddr*)&addr, addr_size)==-1)
		error_handling("connect() error");
	else
		puts("Connected......");
	
	fputs("Operand count: ", stdout);
	scanf("%d", &opnd_cnt);
	mpmsg[0] = (char)opnd_cnt;
	
	for(i=0; i<opnd_cnt; i++) {
		printf("Operand %d: ", i+1);
		scanf("%d", (int*)&opmsg[1+OPSZ*i]);
	}
	
	fgetc(stdin); //'\n'

	fputs("Operator: ", stdout);
	scanf("%c", &opmsg[1+OPSZ*opnd_cnt]);
	
	write(sock, opmsg, 1+OPSZ*opnd_cnt+1);
	read(sock, &result, RLT_SIZE);
	printf("Operation result: %d\n", result);
	
	close(sock);
	return 0;
}


void error_handling(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

gcc op_client.c -o opclient
./eclient 127.0.0.1 9190

Windows计算器服务器端

op_server_win.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

#define BUF_SIZE 1024
#define OPSZ 4
void ErrorHanding(char *message);

int main(int argc, char *argv[]) {
	WSADATA wsaData;
	SOCKET hServSock;
	SOCKET hClntSock;
	char opinfo[BUF_SIZE];
	int result;
	int opnc_cnt;
	int i;
	int recv_len;
	int recv_cnt;
	SOCKADDR_IN servAddr;
	SOCKADDR_IN clntAddr;
	int szAddr;

	if(argc!=2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	if(WSAStartup(MAKEWORD(2, 2), &wsaData)!=0)
		ErrorHanding("WSAStartup() error!");
	
	hServSock = socket(PF_INET, SOCK_STREAM, 0);	
	if(hServSock==INVALID_SOCKET)
		ErrorHanding("socket() error");

	szAddr = sizeof(SOCKADDR_IN);

	memset(&servAddr, 0, szAddr);
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servAddr.sin_port = htons(atoi(argv[1]));
	
	if(bind(hServSock, (SOCKADDR *)&servAddr, szAddr)==SOCKET_ERROR)
		ErrorHanding("bind() error");
		
	if(listen(hServSock, 5)==SOCKET_ERROR)
		ErrorHanding("listen() error");

	for(i=0; i<5; i++) {
		opnd_cnt = 0;
		hClntSock = accept(hServSock, (SOCKADDR *)&clntAddr, &szAddr);	
		//if(hClntSock==INVALID_SOCKET)
		if(hClntSock==-1)
			ErrorHanding("accept() error");
		else
			printf("Connected client %d\n", i+1);
			
		//接收一个字节，数值个数
		recv(hClntSock, &opnd_cnt, 1, 0);
			
		recv_len = 0;
		//接收opnd_cnt个数值+1个运算符
		while(recv_len<OPSZ*opnd_cnt+1) {
			recv_cnt = recv(hClntSock, &opinfo[recv_len], BUF_SIZE-1, 0);
			recv_len += recv_cnt;
		}
	
		result = calculate(opnd_cnt, (int*)opinfo, opinfo[recv_len-1);
		send(hClntSock, (char *)&result, sizeof(result), 0);
		
		closesocket(hClntSock);
	}
	
	closesocket(hServSock);
	WSACleanup();
	return 0;
}

int calculate(int opnum, int opnds[], char op) {
	int result = opnds[0], i;
	switch(op) {
	case '+':
		for(i=1; i<opnum; i++)
			result += opnds[i];
		break;
	case '-':
		for(i=1; i<opnum; i++)
			result -= opnds[i];
		break;
	case '*':
		for(i=1; i<opnum; i++)
			result *= opnds[i];
		break;
	}
	return result;
}

void ErrorHanding(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

cl /EHsc op_server_win.c /Fe:opServerWin.exe /link ws2_32.lib
opServerWin 9190

Windows计算器客户端

op_client_win.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

#define BUF_SIZE 1024
#define RLT_SIZE 4
#define OPSZ 4
void ErrorHanding(char *message);

int main(int argc, char *argv[]) {
	WSADATA wsaData;
	SOCKET hSock;
	char opmsg[BUF_SIZE];
	int result;
	int opnd_cnt;
	int i;
	
	SOCKADDR_IN servAddr;
	int szAddr;

	if(argc!=3) {
		printf("Usage : %s <IP> <port>\n", argv[0]);
		exit(1);
	}

	if(WSAStartup(MAKEWORD(2, 2), &wsaData)!=0)
		ErrorHanding("WSAStartup() error!");
	
	hSock = socket(PF_INET, SOCK_STREAM, 0);	
	if(hSock==INVALID_SOCKET)
		ErrorHanding("socket() error");
		
	szAddr = sizeof(SOCKADDR_IN);
	
	memset(&servAddr, 0, szAddr);
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.s_addr = inet_addr(argv[1]);
	servAddr.sin_port = htons(atoi(argv[2]));
	
	if(connect(hSock, (SOCKADDR *)&servAddr, szAddr )==SOCKET_ERROR)
		ErrorHanding("connect() error");
	else
		puts("Connected.......");
		
	fputs("Operand count: ", stdout);
	scanf("%d", &opnd_cnt);
	mpmsg[0] = (char)opnd_cnt;
	
	for(i=0; i<opnd_cnt; i++) {
		printf("Operand %d: ", i+1);
		scanf("%d", (int*)&opmsg[1+OPSZ*i]);
	}
	
	fgetc(stdin); //'\n'

	fputs("Operator: ", stdout);
	scanf("%c", &opmsg[1+OPSZ*opnd_cnt]);
	
	send(hSock, opmsg, 1+OPSZ*opnd_cnt+1, 0);
	recv(hSock, &result, RLT_SIZE, 0);
	printf("Operation result: %d\n", result);
	
	closesocket(hSock);
	WSACleanup();
	return 0;
}

void ErrorHanding(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

cl /EHsc op_client_win.c /Fe:opClientWin.exe /link ws2_32.lib
opClientWin 127.0.0.1 9190