{"id":5057,"date":"2024-01-13T19:29:49","date_gmt":"2024-01-13T11:29:49","guid":{"rendered":"https:\/\/www.kenpai.com\/cms\/5057\/"},"modified":"2024-01-13T19:29:49","modified_gmt":"2024-01-13T11:29:49","slug":"%e5%a4%9a%e8%bf%9b%e7%a8%8b%e5%a4%9a%e7%ba%bf%e7%a8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%88tcp_server%ef%bc%89%e7%bc%96%e5%86%99","status":"publish","type":"post","link":"https:\/\/www.kenpai.com\/cms\/5057\/","title":{"rendered":"\u591a\u8fdb\u7a0b\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\uff08tcp_server\uff09\u7f16\u5199"},"content":{"rendered":"<\/p>\n

\u7f16\u5199\u5ba2\u6237\/\u670d\u52a1\u5668<\/strong><\/p>\n

1.\u7f16\u5199\u5355\u8fdb\u7a0b\u5ba2\u6237\/\u670d\u52a1\u5668\uff08Version1\uff09<\/p>\n

\u4ee3\u7801\u6e05\u5355\uff1a
tcp_servet<\/strong><\/p>\n

#include<stdio.h>
#include<sys\/types.h>
#include<sys\/socket.h>
#include<stdlib.h>
#include<netinet\/in.h>
#include<arpa\/inet.h>
#include<string.h><\/p>\n

static void usage(const char* proc)
{
printf(\\”Usage: %s [local_ip] [local_port]\\”,proc);\/\/\u63d0\u793a\u8f93\u5165\u51fa\u9519\uff0c\u5e94\u8be5\u8f93\u5165.\/tcp_servet ip\u5730\u5740 \u7aef\u53e3\u53f7\uff08\u8fd0\u884c\u670d\u52a1\u5668\uff09
}<\/p>\n

int startup(const char* ip,int port)\/\/\u521b\u5efa\u5957\u63a5\u5b57
{
int sock = socket(AF_INET,SOCK_STREAM,0);\/\/socket\uff08\uff09\u521b\u5efa\u5957\u63a5\u5b57\u51fd\u6570
if(sock<0)
{
perror(\\”socket\\”);\/\/\u63d0\u793a\u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25
exit(2);
}<\/p>\n

\/\/socket\u7684\u8fd4\u56de\u503c\u53ea\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4e3a\u4e86\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\uff0c\u6211\u4eec\u8fd8\u9700\u5c06\u5176\u4e0e\u670d\u52a1\u5668 ip\u5730\u5740\u548c\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a<\/p>\n

struct sockaddr_in local;\/\/\u7ed3\u6784\u4f53struct sockaddr_in\u662fstruct sockaddr\u7684\u5177\u4f53\u5316
local.sin_family = AF_INET;
local.sin_port = htons(port);
local.sin_addr.s_addr = inet_addr(ip);<\/p>\n

if(bind(sock,(struct sockaddr*) &local,sizeof(local))<0){\/\/bind(\u7ed1\u5b9a\u51fd\u6570
perror(\\”bind\\”);
exit(3);
}
\/\/\u76d1\u542c
if(listen(sock,10)<0)\/\/\u670d\u52a1\u566824\u5c0f\u65f6\u76d1\u542c\uff0c\u7b49\u5f85\u8fde\u63a5\u8bf7\u6c42
{
perror(\\”listen\\”);
exit(4);
}
return sock;
}<\/p>\n

\/\/Version 1
\/\/.\/tcp_servet 127.0.0.1 8080 \u672c\u5730\u73af\u56de
int main(int argc,char* argv[])
{
if(argc!=3){
usage(argv[0]);
return 1;
}<\/p>\n

int listen_sock = startup(argv[1],atoi(argv[2]));\/\/create socket<\/p>\n

int new_sock;
while(1){
struct sockaddr_in client;
socklen_t len = sizeof(client);<\/p>\n

new_sock = accept(listen_sock,(struct sockaddr*)&client ,&len);\/\/accept\u521b\u5efa\u65b0\u7684socket,\u7528\u6765\u5904\u7406\u5ba2\u6237\u6bb5\u8bf7\u6c42\uff0clisten_sock\u53ea\u8d1f\u8d23\u76d1\u542c
if(new_sock<0)
{
perror(\\”accept\\”);
exit(5);
continue;
}
\/\/\u6210\u529f\u83b7\u53d6\u5230\u5ba2\u6237\u7aef\uff0c\u6253\u5370\u5ba2\u6237\u7aef\u7684 ip\u548c\u7aef\u53e3\u53f7\uff0caccept\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u7531\u5b83\u53ef\u5f97\u5ba2\u6237\u7aef\u7684ip\u548c\u7aef\u53e3\u53f7
printf(\\”get an new client: %s, %d\\\\n\\”,inet_ntoa(client.sin_addr),ntohs(client.sin_port));
break;
}<\/p>\n

\/\/\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u7684\u6570\u636e\u4f20\u8f93
char buf[1024];
while(1){
int r = read(new_sock,buf,sizeof(buf)-1);\/\/\u4ece\u7f51\u7edc\u4e2d\u8bfb\u53d6\u6570\u636e\uff08\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\uff09\u653e\u5165buf\u4e2d\uff1b
if(r<0){\/\/\u8bfb\u53d6\u5931\u8d25
perror(\\”read\\”);
close(new_sock);
break;
}else if(r==0){\/\/\u5ba2\u6237\u7aef\u5df2\u5173\u95ed
close(new_sock);
printf(\\”client qiuit…\\\\n\\”);
break;
}<\/p>\n

\/\/\u8bfb\u53d6\u6210\u529f
buf[r] = 0;
printf(\\”clinet: %s\\\\n\\”,buf);
write(new_sock,buf,strlen(buf));\/\/\u56de\u9001\u6570\u636e
}<\/p>\n

return 0;
}<\/pre>\n

tcp_client.c<\/strong>\u5ba2\u6237\u7aef<\/p>\n

#include<stdio.h>
#include<stdlib.h>
#include<sys\/types.h>
#include<sys\/socket.h>
#include<arpa\/inet.h>
#include<netinet\/in.h>
#include<string.h><\/p>\n

void static Usage(const char* proc)\/\/\u63d0\u793a\u6253\u5370\u683c\u5f0f
{
printf(\\”Usage: %s [local_ip] [local_port]\\\\n\\”,proc);\/\/\u8fd0\u884c\u5ba2\u6237\u7aef.\/tcp_servet \u670d\u52a1\u5668ip \u670d\u52a1\u5668\u7aef\u53e3\u53f7
}<\/p>\n

\/\/.\/tcp_clinet servet_ip servet_port
int main(int argc,char* argv[])
{
if(argc!=3){
Usage(argv[1]);
exit(1);
}<\/p>\n

int sock = socket(AF_INET,SOCK_STREAM,0);\/\/\u521b\u5efa\u5957\u63a5\u5b57
if(sock < 0 ){
perror(\\”socket\\”);
exit(2);
}
\/\/\u5ba2\u6237\u7aefsocket\u4e0d\u7ed1\u5b9a
struct sockaddr_in server;
server.sin_family = AF_INET;
server.sin_port = htons(atoi(argv[2]));\/\/htons\u5c06\u672c\u5730\u7aef\u53e3\u53f7\u8f6c\u4e3a\u7f51\u7edc\u7aef\u53e3\u53f7
server.sin_addr.s_addr = inet_addr(argv[1]); \/\/\u7ed9\u6570\u636e\u7ed3\u6784\u6210\u5458\u8d4b\u503c
\/\/connect()\u94fe\u63a5\u670d\u52a1\u5668
if(connect(sock,(struct sockaddr*)&server,sizeof(server))<0){
perror(\\”connect\\”);
exit(3);
}
\/\/\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e
char buf[1024];
while(1){
printf(\\”Please Enter$\\”);
fflush(stdout);<\/p>\n

ssize_t s = read(0,buf,sizeof(buf)-1);\/\/\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u6570\u636e\u5230buf
if(s>0){\/\/\u8bfb\u53d6\u6210\u529f
buf[s-1] = 0;
write(sock,buf,strlen(buf));\/\/\u5c06\u6570\u636e\u5199\u5230\u7f51\u7edc\u4e2d
s = read(sock,buf,sizeof(buf)-1);\/\/\u8bfb\u53d6\u56de\u663e\u6570\u636e
if(s>0){
buf[s] = 0;
printf(\\”servetr echo#:%s\\\\n\\”,buf);
}
}
return 0;
}<\/pre>\n

\u6ce8\u610f\u8981\u70b9<\/strong>\uff1a<\/p>\n

\u4e0a\u8ff0\u7684\u670d\u52a1\u5668\u5730\u5740\u91c7\u7528127.0.0.1\uff0c\u6545\u8be5\u670d\u52a1\u5668\u6ca1\u6709\u901a\u8fc7\u7f51\u7edc\u901a\u4fe1\uff0c\u8fd8\u662f\u4e00\u76f4\u76d1\u542c\u6240\u5728\u4e3b\u673a\u4e0a\u7684\u5ba2\u6237\u94fe\u63a5\u8bf7\u6c42\uff0c\u8fd9\u662f\u672c\u5730\u73af\u56de\uff1b<\/p>\n

\u8be5\u5ba2\u6237\/\u670d\u52a1\u5668\u662f\u4e00\u4e2a\u5355\u8fdb\u7a0b\u7684\u670d\u52a1\u5668\uff0c\u4e00\u6b21\u53ea\u80fd\u94fe\u63a5\u4e00\u4e2a\u5ba2\u6237\u8bf7\u6c42\uff0c\u56e0\u4e3a\u6211\u4eec\u5728\u6536\u5230\u4e00\u4e2a\u5ba2\u6237\u8bf7\u6c42\u540e\uff0c\u6267\u884c\u5b8c\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u624d\u63a5\u53d7\u4e0b\u4e00\u4e2a\u8bf7\u6c42\u7684\u94fe\u63a5<\/p>\n

\u5ba2\u6237\u7aef\u7684\u5957\u63a5\u5b57\u53ef\u4ee5\u7ed1\u5b9a\u4e5f\u53ef\u4ee5\u4e0d\u7ed1\u5b9a\uff0c\u4f46\u4e00\u822c\u4e0d\u8fdb\u884c\u7ed1\u5b9a\uff0c\u56e0\u4e3a\u4e00\u70b9\u7ed1\u5b9a\u670d\u52a1\u5668\u7684ip,\u90a3\u4e48\u82e5\u522b\u7684\u5ba2\u6237\u7aef\u60f3\u94fe\u63a5\uff0c\u94fe\u63a5\u4e0d\u4e0a<\/p>\n

\u6d89\u53ca\u51fd\u6570\u4ee5\u53ca\u547d\u4ee4<\/p>\n

\u521b\u5efasocket <\/p>\n

domain\u8868\u793a\u57df\uff0cipv4\u4e3aAF_INET;
type\u8868\u793a\u7c7b\u578b\uff0cSOCK_STREAM(\u9762\u5411\u5b57\u8282\u6d41)
protocal\u8868\u793a\u534f\u8bae\uff0c\u5355\u4e2a\u901a\u4fe1\u534f\u8bae\u60c5\u51b5\u4e0b\u4e3a0<\/p>\n

bind\u7ed1\u5b9a <\/p>\n

sockfd : socket()\u7684\u8fd4\u56de\u503c\uff0c\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26
addr\uff1a\u4e00\u4e2astruct sockaddr_in \u7684\u7ed3\u6784\u4f53 <\/p>\n

struct in_addr\u7ed3\u6784\u4f53\u6210\u5458\u662fs_addr,\u8868\u793aip\u5730\u5740\uff1b
addrlen\uff1a\u7ed3\u6784\u4f53\u5927\u5c0f<\/p>\n

accept\u521b\u5efa\u65b0\u7684socket <\/p>\n

addr\u662f\u4e00\u4e2a\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u8f93\u51fa\u7684\u662f\u5ba2\u6237\u7aef\u7684struct sockaddr_in \u7684\u5185\u5bb9
addrlen\u662f\u4e00\u4e2a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570
ip\u8f6c\u6362 <\/p>\n

\u672c\u5730\u7aef\u53e3\u53f7\u4e0e\u7f51\u7edc\u7aef\u53e3\u53f7\u7684\u4e92\u6362 <\/p>\n

\u76d1\u542c <\/p>\n

backlog : \u662f\u64cd\u4f5c\u7cfb\u7edf\u5e95\u5c42\u8fde\u63a5\u961f\u5217\uff0c\u4e0d\u80fd\u8bbe\u7f6e\u8fc7\u5927\uff1b
connect\u51fd\u6570\uff08\u5ba2\u6237\u7aef\u8fde\u63a5\u670d\u52a1\u5668\uff09 <\/p>\n

2.\u591a\u8fdb\u7a0b\u670d\u52a1\u5668\u7f16\u5199<\/p>\n

\u4ee3\u7801\u6e05\u5355\uff1a
tcp_servet.c<\/p>\n

#include<stdio.h>
#include<stdlib.h>
#include<sys\/types.h>
#include<sys\/socket.h>
#include<netinet\/in.h>
#include<arpa\/inet.h>
#include<string.h><\/p>\n

\/\/Version2<\/p>\n

void static usage(const char* proc)
{
printf(\\”Usage: %s [local_ip] [local_port]\\\\n\\”,proc);
}<\/p>\n

int startup(char* _ip,int _port)
{
int sock = socket(AF_INET,SOCK_STREAM,0);
if(sock<0){
perror(\\”socket\\”);
exit(2);
}
struct sockaddr_in local;
local.sin_family = AF_INET;
local.sin_port = htons(_port);
local.sin_addr.s_addr = inet_addr(_ip);<\/p>\n

if(bind(sock,(struct sockaddr*) &local,sizeof(local))<0){
perror(\\”bind\\”);
exit(3);
}<\/p>\n

if(listen(sock,10)<0){
perror(\\”listen\\”);
exit(4);
}
return sock;
}<\/p>\n

\/\/.\/tcp_servet local_ip local_port
int main(int argc,char* argv[]){
if(argc!=3){
usage(argv[0]);
return 1;
}<\/p>\n

int listen_sock = startup(argv[1],atoi(argv[2]));<\/p>\n

int new_sock;
while(1){
struct sockaddr_in client;
socklen_t len = sizeof(client);
new_sock = accept(listen_sock,(struct sockaddr*) &client,&len);
if(new_sock < 0){
perror(\\”accept\\”);
exit(5);
continue;
}
printf(\\”get an new client:%s,%d\\\\n\\”,inet_ntoa(client.sin_addr),ntohs(client.sin_port));
break;
}<\/p>\n

\/\/\u521b\u5efa\u4e86\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u4ee3\u66ff\u6211\u4eec\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42—\u4e0e\u4e0a\u8ff0\u5355\u8fdb\u7a0b\u7684\u4e0d\u540c\u4e4b\u5904
pid_t id = fork();
if(id<0){
perror(\\”fork\\”);
exit(6);
}else if(id==0){\/\/child
close(listen_sock);\/\/\u5173\u95ed\u4e0d\u5fc5\u8981\u7684\u6587\u4ef6
if(fork > 0){\/\/\u4e24\u6b21fork
exit(7);
}<\/p>\n

char buf[1024];
while(1){
int r= read(new_sock);
if(r<0){
perror(\\”read\\”);
close(new_sock);
break;
}else if(r==0){
close(new_sock);
printf(\\”clinet quit…\\\\n\\”);
break;
}
buf[r] = 0;
printf(\\”clien: %S\\\\n\\”,buf);
write(new_sock,buf,strlen(buf));
close(new_sock);
}<\/p>\n

}else{\/\/father
close(new_sock);\/\/\u7236\u8fdb\u7a0b\u7ee7\u7eed\u8d1f\u8d23\u76d1\u542c\u5ba2\u6237\u8bf7\u6c42\uff0c\u5fc5\u987b\u5173\u95ednew_sock\u6587\u4ef6
}
}<\/pre>\n

\u6ce8\u610f\u8981\u70b9<\/strong>\uff1a<\/p>\n

\u4e0e\u5355\u8fdb\u7a0b\u7684\u552f\u4e00\u4e0d\u540c\u7684\u662f\uff0c fork\u4e86\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u6bcf\u6b21\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u4ea4\u7ed9\u5b50\u8fdb\u7a0b\u5b8c\u6210\uff0c\u7236\u8fdb\u7a0b\u53ea\u8d1f\u8d23\u76d1\u542c \uff1b
\u4e24\u6b21 fork<\/strong>,\u4e3a\u4e86\u80fd\u591f\u8ba9\u7236\u8fdb\u7a0b\u53ea\u8d1f\u8d23\u76d1\u542c\uff0c\u800c\u4e0d\u963b\u585e\u5f0f\u7684\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\uff0c\u6211\u4eec\u91c7\u7528\u4e24\u6b21fork\uff0c\u6b64\u65f6\u5b58\u5728\u4e24\u4e2a\u8fdb\u7a0b\uff0c\u4e24\u4e2a\u8fdb\u7a0b\u5b58\u5728\u7237\u5b59\u5173\u7cfb\uff0c\u201c\u5b59\u5b50\u201d\u8fdb\u7a0b\u6b64\u65f6\u7531\u4e8e\u7236\u8fdb\u7a0b\u5df2\u7ecf\u9000\u51fa\uff0c\u6240\u4ee5\u5b83\u662f\u5b64\u513f\u8fdb\u7a0b\uff0c\u7531 init\u8fdb\u7a0b\u56de\u6536\uff0c\u4e0e\u6b64\u523b\u7684\u7236\u8fdb\u7a0b\u6ca1\u6709\u5173\u7cfb<\/p>\n

pid_t id = fork();
if(id<0){
perror(\\”fork\\”);
exit(6);
}else if(id==0){\/\/child
close(listen_sock);\/\/\u5173\u95ed\u4e0d\u5fc5\u8981\u7684\u6587\u4ef6
if(fork > 0){\/\/\u4e24\u6b21fork\uff0c\u7b2c\u4e8c\u6b21\u521b\u5efa\u5b8c\u5b50\u8fdb\u7a0b\u540e\u8be5\u7236\u8fdb\u7a0b\u9000\u51fa
exit(7);
}<\/pre>\n

\u7236\u8fdb\u7a0b\u5fc5\u987b\u5173\u95ednew_sock\u6587\u4ef6\uff0c\u56e0\u4e3a\u5b50\u8fdb\u7a0b\u62f7\u8d1d\u4e86\u7236\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\uff0c\u4e24\u8005\u8868\u662f\u4e00\u6837\u7684\uff0c\u82e5\u4e0d\u5173\u95ed\uff0c\u6bcf\u6b21\u5ba2\u6237\u7aef\u53d1\u9001\u6765\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5\uff0c\u5c31\u8981\u5728\u7236\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u8fd9\u6837\u6d6a\u8d39\u8d44\u6e90\uff0c\u800c\u4e14\u5f88\u5feb\u4f1a\u7528\u5b8c\uff1b\uff08\u5b50\u8fdb\u7a0b\u5904\u7406\u5b8c\u4fe1\u606f\u540e\u9000\u51fa\u65f6\u5173\u95ed\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\uff0c\u800c\u7236\u8fdb\u7a0b\u4e00\u76f4\u5904\u4e8e\u8fd0\u884c\u72b6\u6001\uff0c\u6240\u4ee5\u5fc5\u987b\u4e3b\u52a8\u5173\u95ed\uff09<\/p>\n

3.\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u7684\u7f16\u5199<\/p>\n

\u4ee3\u7801\uff1a <\/p>\n<\/p>\n

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