如何进行Linux网络编程

mytomorrow · 发表于 2019-10-9 14:30

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1、 tcp程序设计

代码1 server：

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define portnumber 3333
int main(int argc, char *argv[])
{
int sockfd, new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int nbytes;
char buffer[1024];
//AF_INET: IPV4, SOCK_STREAM: TCP
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
fprintf(stderr, "Socket error:%s\n\a", strerror(errno));
exit(1);
}
bzero(&server_addr, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(portnumber);
if(bind(sockfd, (struct sockaddr *) (&server_addr), sizeof(structsockaddr)) == -1)
{
fprintf(stderr, "Bind error: %s\n\a", strerror(errno));
exit(1);
}
if(listen(sockfd, 5) == -1)
{
fprintf(stderr, "Listen error: %s\n\a", strerror(errno));
exit(1);
}
while(1)
{
sin_size = sizeof(struct sockaddr_in);
if((new_fd = accept(sockfd, (struct sockaddr *)(&client_addr),&sin_size)) == -1)
{
fprintf(stderr, "Accept error:%s\n\a", strerror(errno));
exit(1);
}
fprintf(stderr, "Server get connection from %s\n",(char*)inet_ntoa(client_addr.sin_addr));
if((nbytes = read(new_fd, buffer, 1024)) == -1)
{
fprintf(stderr, "Read Error: %s\n", strerror(errno));
exit(1);
}
buffer[nbytes] = '\0';
printf("Server received %s\n", buffer);
close(new_fd);
}
close(sockfd);
return 0;
}
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代码2 client：

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define portnumber 3333
int main(int argc, char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
if(argc != 2)
{
fprintf(stderr, "Usage: %s hostname \a\n", argv[0]);
exit(1);
}
if((host = gethostbyname(argv[1])) == NULL)
{
fprintf(stderr, "Gethostname Error:%s\a\n", strerror(errno));
exit(1);
}
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
fprintf(stderr, "Socket Error: %s\a\n", strerror(errno));
exit(1);
}
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(portnumber);
server_addr.sin_addr = *((struct in_addr *) host->h_addr);
if(connect(sockfd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr))== -1)
{
fprintf(stderr, "Connect Error: %s\a\n", strerror(errno));
exit(1);
}
printf("Please input char: \n");
fgets(buffer, 1024, stdin);
write(sockfd, buffer, strlen(buffer));
close(sockfd);
return 0;
}2 k+ W* B8 _* h2 a9 F

Makefile：
% _% m& v: P7 Y* y+ Q' U, Y: S

运行结果：

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Demyar · 发表于 2019-10-9 18:48

看看如何进行Linux网络编程。

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