upd通信代码-linux版本

1.服务端代码

#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <errno.h>

#define SERV_PORT 8000
#define MAXLINE 1024
#define SA struct sockaddr

void dg_echo(int sockfd, SA* pcliaddr, socklen_t clilen);

int main(int argc, char* argv[])
{
    int sockfd, ret;
    struct sockaddr_in servaddr, cliaddr;
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        printf("socket error, %d:%s\n", errno, strerror(errno));
        return -1;
    }
    bzero(&servaddr, sizeof(servaddr));

    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(SERV_PORT);

    ret = bind(sockfd, (SA*)&servaddr, sizeof(servaddr));
    if (ret < 0)
    {
        printf("bind error, %d:%s\n", errno, strerror(errno));
        return -1;
    }
    dg_echo(sockfd, (SA*)&cliaddr, sizeof(cliaddr));

    return 0;
}

void dg_echo(int sockfd, SA* pcliaddr, socklen_t clilen)
{
    int n;
    socklen_t len;
    char mesg[MAXLINE];

    for (;;)
    {
        len = clilen;
        n = recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len);
        sendto(sockfd, mesg, n, 0, pcliaddr, len);
    }
}

#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <errno.h>
       
#define SERV_PORT 8000
#define MAXLINE 1024
#define SA struct sockaddr

void dg_echo(int sockfd, SA* pcliaddr, socklen_t clilen);

int main(int argc, char* argv[])
{
	int sockfd, ret;
	struct sockaddr_in servaddr, cliaddr;
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	if (sockfd < 0)
	{
		printf("socket error, %d:%s\n", errno, strerror(errno));
		return -1;
	}
	bzero(&servaddr, sizeof(servaddr));
	
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(SERV_PORT);
	
	ret = bind(sockfd, (SA*)&servaddr, sizeof(servaddr));
	if (ret < 0)
	{
		printf("bind error, %d:%s\n", errno, strerror(errno));
		return -1;
	}
	dg_echo(sockfd, (SA*)&cliaddr, sizeof(cliaddr));
	
	return 0;
}

void dg_echo(int sockfd, SA* pcliaddr, socklen_t clilen)
{
	int n;
	socklen_t len;
	char mesg[MAXLINE];
	
	for (;;)
	{
		len = clilen;
		n = recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len);
		sendto(sockfd, mesg, n, 0, pcliaddr, len);
	}
}

2.客户端代码

#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>

#define SERV_PORT 8000
#define MAXLINE 1024
#define SA struct sockaddr

void dg_echo(FILE*fp, int sockfd, const SA* pservaddr, socklen_t servlen);

int main(int argc, char* argv[])
{
    int sockfd;
    struct sockaddr_in servaddr;
    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(SERV_PORT);
    inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        printf("socket error, %d:%s\n", errno, strerror(errno));
        return -1;
    }

    dg_echo(stdin, sockfd, (SA*)&servaddr, sizeof(servaddr));

    return 0;
}

void dg_echo(FILE* fp, int sockfd, const SA* pservaddr, socklen_t servlen)
{
    int n;
    char sendline[MAXLINE], recvline[MAXLINE + 1];
    while(fgets(sendline, MAXLINE, fp) != NULL)
    {
        sendto(sockfd, sendline, strlen(sendline), 0, pservaddr, servlen);
        n = recvfrom(sockfd, recvline, MAXLINE, 0, NULL, NULL);
        recvline[n] = 0;
        fputs(recvline, stdout);
    }
}

#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
       
#define SERV_PORT 8000
#define MAXLINE 1024
#define SA struct sockaddr

void dg_echo(FILE*fp, int sockfd, const SA* pservaddr, socklen_t servlen);

int main(int argc, char* argv[])
{
	int sockfd;
	struct sockaddr_in servaddr;
	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(SERV_PORT);
	inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);
	
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	if (sockfd < 0)
	{
		printf("socket error, %d:%s\n", errno, strerror(errno));
		return -1;
	}

	dg_echo(stdin, sockfd, (SA*)&servaddr, sizeof(servaddr));
	
	return 0;
}

void dg_echo(FILE* fp, int sockfd, const SA* pservaddr, socklen_t servlen)
{
	int n;
	char sendline[MAXLINE], recvline[MAXLINE + 1];
	while(fgets(sendline, MAXLINE, fp) != NULL)
	{
		sendto(sockfd, sendline, strlen(sendline), 0, pservaddr, servlen);
		n = recvfrom(sockfd, recvline, MAXLINE, 0, NULL, NULL);
		recvline[n] = 0;
		fputs(recvline, stdout);
	}
}