码迷，mamicode.com
首页 > 编程语言 > 详细

c语言的tcp和udp客户端和服务器

时间：2016-06-21 17:07:10      阅读：242      评论：0      收藏：0      [点我收藏+]

标签：

都是最简单的用来记忆。

this is my 的git地址：https://github.com/yanjinyun/cLanguageTcpUdp

tcp最简单的服务器：

int main(int argc, const char *argv[])
{
    int listenfd, acceptfd;
    struct sockaddr_in sin, cin;
    socklen_t clen;
    char buf[1024];

    signal(SIGCHLD, SIG_IGN);

    listenfd = socket(PF_INET, SOCK_STREAM, 0);

    sin.sin_family = PF_INET;
    sin.sin_port = htons(atoi(argv[2]));
    sin.sin_addr.s_addr = inet_addr(argv[1]);
    bind(listenfd, (struct sockaddr *)&sin, sizeof(sin));

    listen(listenfd, 5);

    while(1)
    {
        clen = sizeof(cin);
        printf("listen ......\n");
        acceptfd = accept(listenfd, (struct sockaddr *)&cin, &clen);
        printf("client %s %d connect\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));

        if(fork() == 0)
        {
            close(listenfd);

            while(1)
            {
                bzero(buf, sizeof(buf));
                if(recv(acceptfd, buf, sizeof(buf), 0) == 0)
                {
                    printf("client %s %d exit\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));
                    exit(0);
                }
                printf("recv(%s %d): %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf);
            }
        }

        close(acceptfd);
    }

    return 0;
}

tcp最简单的客户端：

int main(int argc, const char *argv[])
{
    int cfd = socket(PF_INET, SOCK_STREAM, 0);
    struct sockaddr_in cin;
    char buf[1024];

    cin.sin_family = PF_INET;
    cin.sin_port = htons(atoi(argv[2]));
    cin.sin_addr.s_addr = inet_addr(argv[1]);
    connect(cfd, (struct sockaddr *)&cin, sizeof(cin));

    printf("connect ip(%s) port(%s) server ok\n", argv[1], argv[2]);

    if(fork() == 0)
    {
        while(1)
        {
            bzero(buf, sizeof(buf));
            recv(cfd, buf, sizeof(buf), 0);
            printf("recv: %s\n", buf);
        }
    }

    while(1)
    {
        fgets(buf, sizeof(buf), stdin);
        buf[strlen(buf)-1] = ‘\0‘;
        send(cfd, buf, strlen(buf)+1, 0);
    }

    return 0;
}

udp的最简单的服务器：

int main(int argc, const char *argv[])
{
	int sfd;
	struct sockaddr_in sin, cin;
	char buf1[1024], buf2[1024], buf3[1024];
	socklen_t clen;

	sfd = socket(PF_INET, SOCK_DGRAM, 0);

	sin.sin_family = PF_INET;
	sin.sin_port = htons(atoi(argv[2]));
	sin.sin_addr.s_addr = inet_addr(argv[1]);
	bind(sfd, (struct sockaddr *)&sin, sizeof(sin));

	if(fork() == 0)
	{
		while(1)
		{
			clen = sizeof(cin);
			bzero(buf1, sizeof(buf1));
			recvfrom(sfd, buf1, sizeof(buf1), 0, (struct sockaddr *)&cin, &clen);
			printf("recvfrom: %s %d %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf1);
		}
	}

	while(1)
	{
		fscanf(stdin, "%s%s%s", buf1, buf2, buf3);
		cin.sin_family = PF_INET;
		cin.sin_port = htons(atoi(buf2));
		cin.sin_addr.s_addr = inet_addr(buf1);
		sendto(sfd, buf3, strlen(buf3)+1, 0, (struct sockaddr *)&cin, sizeof(cin));
	}

	return 0;
}

udp最简单的客户端：

int main(int argc, const char *argv[])
{
	int sfd;
	struct sockaddr_in cin;
	char buf1[1024], buf2[1024], buf3[1024];
	socklen_t clen;

	sfd = socket(PF_INET, SOCK_DGRAM, 0);

	if(fork() == 0)
	{
		while(1)
		{
			clen = sizeof(cin);
			bzero(buf1, sizeof(buf1));
			recvfrom(sfd, buf1, sizeof(buf1), 0, (struct sockaddr *)&cin, &clen);
			printf("recvfrom: %s %d %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf1);
		}
	}

	while(1)
	{
		fscanf(stdin, "%s%s%s", buf1, buf2, buf3);
		cin.sin_family = PF_INET;
		cin.sin_port = htons(atoi(buf2));
		cin.sin_addr.s_addr = inet_addr(buf1);
		sendto(sfd, buf3, strlen(buf3)+1, 0, (struct sockaddr *)&cin, sizeof(cin));
	}

	return 0;
}

ftp最简单的服务器器：

#define N 256

void list(int connectfd)
{
	DIR *dir;
	struct dirent *d;
	char buf[N];

	if((dir=opendir((const char *)get_current_dir_name())) == NULL)
	{
		perror("opendir");
		exit(1);
	}
	while((d=readdir(dir)) != NULL)
	{
		if(d->d_name[0] == ‘.‘)
		{
			continue;
		}
		strcpy(buf, d->d_name);
		send(connectfd, buf, N, 0);
	}

	closedir(dir);
}

void get(int connectfd, char *filename)
{
	char buf[N];
	FILE *fp;
	int n;

	if((fp=fopen(filename, "r")) == NULL)
	{
		strcpy(buf, "no");
		send(connectfd, buf, sizeof(buf), 0);
	}

	strcpy(buf, "yes");
	send(connectfd, buf, sizeof(buf), 0);

	while((n=fread(buf, 1, sizeof(buf), fp)) > 0)
	{
		send(connectfd, buf, n, 0);
	}

	fclose(fp);
}

void put(int connectfd, char *filename)
{
	char buf[N];
	FILE *fp;
	int n;

	if((fp=fopen(filename, "r")) == NULL)
	{
		strcpy(buf, "no");
		send(connectfd, buf, sizeof(buf), 0);
		fp = fopen(filename, "w");
		while((n=recv(connectfd, buf, sizeof(buf), 0)) > 0)
		{
			fwrite(buf, 1, n, fp);
		}
		fclose(fp);

		return;
	}

	strcpy(buf, "yes");
	send(connectfd, buf, sizeof(buf), 0);
}

int main(int argc, const char *argv[])
{
	FILE *fp;
	int n, listenfd, connectfd, i;
	struct sockaddr_in s, c;
	struct servent *sport;
	socklen_t clen;
	char *linep = NULL, buf[N], *arg[32];

	signal(SIGCHLD, SIG_IGN);

	if((fp=fopen("/etc/ftp.conf", "r")) == NULL)
	{
		perror("fopen");
		exit(1);
	}

	if(getline(&linep, &n, fp) == -1)
	{
		perror("getline");
		exit(0);
	}
	linep[strlen(linep)-1] = ‘\0‘;
	chdir(linep);

	if((sport=getservbyname("myftp", "tcp")) == NULL)
	{
		perror("getservbyname");
		exit(1);
	}

#ifdef DEBUG
	printf("%d %s\n", n, linep);
#endif

	if((listenfd=socket(PF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket");
		exit(1);
	}
	
	s.sin_family = PF_INET;
	s.sin_port = sport->s_port; 
	s.sin_addr.s_addr = htonl(INADDR_ANY);
	if(bind(listenfd, (struct sockaddr *)&s, sizeof(s)) == -1)
	{
		perror("bind");
		exit(1);
	}

	listen(listenfd, 5);

	while(1)
	{
		clen = sizeof(c);
		if((connectfd=accept(listenfd, (struct sockaddr *)&c, &clen)) == -1)
		{
			perror("accept");
			exit(1);
		}

		if(fork() == 0)
		{
			close(listenfd);

			recv(connectfd, buf, sizeof(buf), 0);

			arg[0] = strtok(buf, " ");
			for(i=1; arg[i-1]!=NULL; i++)
			{
				arg[i]=strtok(NULL, " ");
			}

			if(strcmp(arg[0], "list") == 0)
			{
				list(connectfd);
			}

			if(strcmp(arg[0], "get") == 0)
			{
				get(connectfd, arg[1]);
			}

			if(strcmp(arg[0], "put") == 0)
			{
				put(connectfd, arg[1]);
			}

			close(connectfd);
			exit(0);
		}

		close(connectfd);
	}
}

　　

　　

ftp最简单的客户端器：

#define N 256

void list(int connectfd)
{
	DIR *dir;
	struct dirent *d;
	char buf[N];

	if((dir=opendir((const char *)get_current_dir_name())) == NULL)
	{
		perror("opendir");
		exit(1);
	}
	while((d=readdir(dir)) != NULL)
	{
		if(d->d_name[0] == ‘.‘)
		{
			continue;
		}
		strcpy(buf, d->d_name);
		send(connectfd, buf, N, 0);
	}

	closedir(dir);
}

void get(int connectfd, char *filename)
{
	char buf[N];
	FILE *fp;
	int n;

	if((fp=fopen(filename, "r")) == NULL)
	{
		strcpy(buf, "no");
		send(connectfd, buf, sizeof(buf), 0);
	}

	strcpy(buf, "yes");
	send(connectfd, buf, sizeof(buf), 0);

	while((n=fread(buf, 1, sizeof(buf), fp)) > 0)
	{
		send(connectfd, buf, n, 0);
	}

	fclose(fp);
}

void put(int connectfd, char *filename)
{
	char buf[N];
	FILE *fp;
	int n;

	if((fp=fopen(filename, "r")) == NULL)
	{
		strcpy(buf, "no");
		send(connectfd, buf, sizeof(buf), 0);
		fp = fopen(filename, "w");
		while((n=recv(connectfd, buf, sizeof(buf), 0)) > 0)
		{
			fwrite(buf, 1, n, fp);
		}
		fclose(fp);

		return;
	}

	strcpy(buf, "yes");
	send(connectfd, buf, sizeof(buf), 0);
}

int main(int argc, const char *argv[])
{
	FILE *fp;
	int n, listenfd, connectfd, i;
	struct sockaddr_in s, c;
	struct servent *sport;
	socklen_t clen;
	char *linep = NULL, buf[N], *arg[32];

	signal(SIGCHLD, SIG_IGN);

	if((fp=fopen("/etc/ftp.conf", "r")) == NULL)
	{
		perror("fopen");
		exit(1);
	}

	if(getline(&linep, &n, fp) == -1)
	{
		perror("getline");
		exit(0);
	}
	linep[strlen(linep)-1] = ‘\0‘;
	chdir(linep);

	if((sport=getservbyname("myftp", "tcp")) == NULL)
	{
		perror("getservbyname");
		exit(1);
	}

#ifdef DEBUG
	printf("%d %s\n", n, linep);
#endif

	if((listenfd=socket(PF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket");
		exit(1);
	}
	
	s.sin_family = PF_INET;
	s.sin_port = sport->s_port; 
	s.sin_addr.s_addr = htonl(INADDR_ANY);
	if(bind(listenfd, (struct sockaddr *)&s, sizeof(s)) == -1)
	{
		perror("bind");
		exit(1);
	}

	listen(listenfd, 5);

	while(1)
	{
		clen = sizeof(c);
		if((connectfd=accept(listenfd, (struct sockaddr *)&c, &clen)) == -1)
		{
			perror("accept");
			exit(1);
		}

		if(fork() == 0)
		{
			close(listenfd);

			recv(connectfd, buf, sizeof(buf), 0);

			arg[0] = strtok(buf, " ");
			for(i=1; arg[i-1]!=NULL; i++)
			{
				arg[i]=strtok(NULL, " ");
			}

			if(strcmp(arg[0], "list") == 0)
			{
				list(connectfd);
			}

			if(strcmp(arg[0], "get") == 0)
			{
				get(connectfd, arg[1]);
			}

			if(strcmp(arg[0], "put") == 0)
			{
				put(connectfd, arg[1]);
			}

			close(connectfd);
			exit(0);
		}

		close(connectfd);
	}
}

 

c语言的tcp和udp客户端和服务器

标签：

原文地址：http://www.cnblogs.com/coding4/p/5603889.html
踩
(0)
赞
(0)
   
举报
评论 一句话评论（0）
登录后才能评论！
分享档案
更多>
2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)
周排行
mamicode.com排行更多图片
更多
友情链接
兰亭集智   国之画   百度统计   站长统计   阿里云   chrome插件   新版天听网
关于我们 - 联系我们 - 留言反馈
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码！