{"id":5047,"date":"2024-01-13T19:29:39","date_gmt":"2024-01-13T11:29:39","guid":{"rendered":"https:\/\/www.kenpai.com\/cms\/5047\/"},"modified":"2024-01-13T19:29:39","modified_gmt":"2024-01-13T11:29:39","slug":"tcp-server%e7%9a%84%e5%ae%9e%e7%8e%b0%ef%bc%8c%e5%92%8c%e5%a4%9a%e7%ba%bf%e7%a8%8b%ef%bc%8c%e5%a4%9a%e8%bf%9b%e7%a8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.kenpai.com\/cms\/5047\/","title":{"rendered":"TCP server\u7684\u5b9e\u73b0\uff0c\u548c\u591a\u7ebf\u7a0b\uff0c\u591a\u8fdb\u7a0b\u670d\u52a1\u5668"},"content":{"rendered":"<\/p>\n

socket<\/p>\n

\u5728TCP\/IP\u534f\u8bae\u4e2d\uff0c“IP\u5730\u5740 TCP\/UDP\u7aef\u53e3\u53f7”\u8868\u793a\u552f\u4e00\u7f51\u7edc\u901a\u4fe1\u4e2d\u7684\u4e00\u4e2a\u8fdb\u7a0b\uff0cIP\u5730\u5740 \u7aef\u53e3\u53f7\u79f0\u4e3asocket\u3002
\u6ce8\u610f\uff1a
\u5b57\u8282\u5e8f\u6709\u5927\u7aef\u548c\u5c0f\u7aef\uff0c\u5728\u4e24\u53f0\u4f7f\u7528\u4e0d\u540c\u5b57\u8282\u5e8f\u7684\u4e3b\u673a\u4e0a\u901a\u4fe1\uff0c\u4e3a\u4e86\u8ba9\u4e24\u53f0\u4e3b\u673a\u95f4\u80fd\u6b63\u786e\u7684\u901a\u4fe1\uff0c\u53d1\u9001\u7aef\u603b\u662f\u628a\u5b57\u8282\u5e8f\u8f6c\u6210\u5927\u7aef\u5b57\u8282\u5e8f\u6570\u636e\u540e\u5728\u53d1\u9001\uff0c\u63a5\u6536\u65b9\u77e5\u9053\u63a5\u53d7\u7684\u4e00\u5b9a\u662f\u5927\u7aef\u5b57\u8282\u5e8f\uff0c\u7136\u540e\u6839\u636e\u81ea\u5df1\u7684\u5b57\u8282\u5e8f\u8fdb\u884c\u8f6c\u5316\u5c31\u4e0d\u4f1a\u51fa\u9519\u3002<\/p>\n

\u8c03\u7528\u51fd\u6570<\/p>\n

int socket(int domain, int type, int protocol)<\/p>\n

\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u544a\u8bc9\u7cfb\u7edf\u4f7f\u7528\u54ea\u4e2a\u5e95\u5c42\u534f\u8bae\u65cf\u3002\u5bf9\u4e8eTCP\/IP\u534f\u8bae\u65cf\u8be5\u53c2\u6570\u5e94\u8be5\u8bbe\u7f6e\u4e3aAF_INET\/PF_INET\u7528\u4e8eIPV4\uff0c\u4e24\u4e2a\u503c\u76f8\u540c\u53ef\u4ee5\u6df7\u7528\u3002 \u7b2c\u4e8c\u4e2a\u53c2\u6570 SOCK_STREAM\u8868\u793a\u4f20\u8f93\u5c42\u4f7f\u7528TCP\uff0cSOCK_DGRAM\u8868\u5f0fUDP\u3002 \u7b2c\u4e09\u4e2a\u53c2\u6570\u901a\u5e38\u90fd\u8bbe\u4e3a0\uff0c\u4f7f\u7528\u9ed8\u8ba4\u534f\u8bae\u3002
int bind(int sockfd, struct sockaddr* my_addr, socklen_t len)
struct sockaddr_in
{
sa_family_t sin_family; \/\/\u5730\u5740\u65cf; AF_INET
u_int16_t sin_port; \/\/\u7aef\u53e3\u53f7
struct in_addr sin_addr; \/\/IPV4\u5730\u5740\u7ed3\u6784\u4f53
}
struct in_addr
{
u_int32_t s_addr; \/\/IPV4\u5730\u5740
} <\/p>\n

bind\u662f\u5c06my_addr\u6240\u6307\u7684socket\u5206\u914d\u5230\u672a\u547d\u540d\u7684sockfd\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n

int listen(int sockfd, int backlog)
socket\u88ab\u547d\u540d\u4e4b\u540e\u4e0d\u80fd\u9a6c\u4e0a\u8fde\u63a5\uff0c\u9700\u8981listen\u521b\u5efa\u4e00\u4e2a\u76d1\u542c\u961f\u5217\uff0csockfd\u662f\u6307\u88ab\u76d1\u542c\u7684socket\uff0cbacklog\u662f\u6307\u5904\u4e8e\u8fde\u63a5\u72b6\u6001\u548csocket\u7684\u4e0a\u9650\u3002<\/p>\n

int accept(int sockfd, struct sockaddr*addr, socklen_t *len)
\u4ecelisten\u76d1\u542c\u961f\u5217\u4e2d\u63a5\u53d7\u4e00\u4e2a\u8fde\u63a5\u3002sockfd\u662f\u6267\u884c\u8fc7linten\u63a5\u53d7\u76d1\u542c\u7684socket\u3002<\/p>\n

\u5355\u8fdb\u7a0b\u7684server<\/p>\n

\/************************************************************************* > File Name: tcp_server.c > Author: weierxiao > Mail: 1091868910@qq.com > Created Time: Sat 08 Jul 2017 05:15:29 PM CST ************************************************************************\/ #include<stdio.h> #include<sys\/socket.h> #include<netinet\/in.h> #include<errno.h> #include<sys\/types.h> #include<unistd.h> #include<string.h> #define _PORT_ 9999 #define _BACKLOG_ 10 int main() { int sock = socket(AF_INET, SOCK_STREAM,0); if (sock < 0) { printf("socket error, errno is %d, errstring is %sn", errno, strerror(errno)); } struct sockaddr_in server_sock; struct sockaddr_in client_sock; bzero(&server_sock, sizeof(server_sock)); server_sock.sin_family = AF_INET; server_sock.sin_addr.s_addr = htonl(INADDR_ANY); server_sock.sin_port = htons(_PORT_); if (bind(sock, (struct sockaddr*)&server_sock, sizeof(struct sockaddr_in))< 0) { printf("bind error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 1; } if (listen(sock, _BACKLOG_)< 0) { printf("listen error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 2; } printf("bind and listen success, wait accept!n"); while (1) { socklen_t len = 0; int client_socket = accept(sock, (struct sockaddr*)&client_sock,&len); if (client_socket < 0) { printf("accept error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 3; } char buf_ip[INET_ADDRSTRLEN]; memset(buf_ip, 0, sizeof(buf_ip)); inet_ntop(AF_INET, &client_sock.sin_addr, buf_ip, sizeof(buf_ip)); printf("get connection :ip is %s, port is %dn ",buf_ip, ntohs(client_sock.sin_port) ); while (1) { char buf[1024]; memset(buf, 0, sizeof(buf)); read(client_socket, buf, sizeof(buf)); printf("client# : %sn", buf); printf("server# :"); memset(buf, 0, sizeof(buf)); fgets(buf, sizeof(buf), stdin); buf[strlen(buf) – 1 ]= \\\\\\’?\\\\\\’; write(client_socket, buf, strlen(buf) 1); printf("please wait …n"); } } close(sock); return 0; } client\u5ba2\u6237\u7aef<\/p>\n

#include<stdio.h> #include<sys\/types.h> #include<sys\/socket.h> #include<netinet\/in.h> #include<unistd.h> #include<string.h> #include<errno.h> #include<arpa\/inet.h> #define SERVER_PORT 9999 #define SERVER_IP "192.168.2.103" int main(int argc, char *argv[]) { if (argc != 2) { printf("Usage : client IPn"); return 1; } char *ip = argv[1]; char buf[1024]; memset(buf,0,sizeof(buf)); struct sockaddr_in server_sock; int sock = socket(AF_INET, SOCK_STREAM, 0); if (sock < 0) { printf("socket error, errno is %d, errstring is %sn", errno, strerror(errno)); } bzero(&server_sock, sizeof(server_sock)); server_sock.sin_family = AF_INET; inet_pton(AF_INET, SERVER_IP, &server_sock.sin_addr); server_sock.sin_port = htons(SERVER_PORT); int ret = connect(sock, (struct sockaddr*)& server_sock, sizeof(server_sock)); if (ret < 0) { printf("connect error, errno is %d, errstring is %sn", errno, strerror(errno)); return 1; } printf("connect sucess!n"); while(1) { printf("client# :"); fgets(buf, sizeof(buf), stdin); buf[strlen(buf)-1] = \\\\\\’?\\\\\\’; write(sock, buf, sizeof(buf)); if (strncasecmp(buf,"quit", 4) == 0) { printf("quit !n"); break; } printf("please waitn"); read(sock, buf, sizeof(buf)); printf("server #:%sn", buf); } close(sock); return 0; }<\/p>\n

\u6211\u4e3b\u673a\u7684ip\u5730\u5740\u662f192.168.2.103.
\u8fd0\u884cserver <\/p>\n

\u7528\u547d\u4ee4netstat _nltp \u53ef\u4ee5\u67e5\u770b\u5f53\u524d\u4e3b\u673a\u7684tcp\u670d\u52a1 <\/p>\n

\u6211\u7ed1\u5b9a\u7684\u662f9999\u7aef\u53e3\uff0cip\u5730\u5740\u8fd8\u6ca1\u786e\u5b9a,\u8fd0\u884c\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1 <\/p>\n

\u591a\u8fdb\u7a0b\u670d\u52a1\u5668<\/p>\n

\u5c06\u901a\u4fe1\u90e8\u5206\u8ba9\u5b50\u8fdb\u7a0b\u53bb\u5904\u7406\uff0c\u5176\u4ed6\u8fc7\u7a0b\u8ba9\u7236\u8fdb\u7a0b\u6765\u5904\u7406\u3002\u4f46\u662f\u95ee\u9898\u6765\u4e86\uff0c\u53ea\u8981\u670d\u52a1\u5668\u4e00\u76f4\u8fd0\u884c\uff0c\u6211\u4eec\u7684\u7236\u8fdb\u7a0b\u5c31\u4e0d\u4f1a\u7ed3\u675f\uff0c\u800c\u5b50\u8fdb\u7a0b\u968f\u65f6\u53ef\u80fd\u7ed3\u675f\uff0c\u8fd9\u6837\u4e00\u6765\u5b50\u8fdb\u7a0b\u5c31\u53d8\u6210\u4e86\u50f5\u5c38\u8fdb\u7a0b\uff0c\u90a3\u4e48\u8fd9\u4e2a\u95ee\u9898\u600e\u4e48\u5904\u7406\u5462\uff1f\u5176\u5b9e\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\u975e\u5e38\u5de7\u5999\uff0c\u6211\u4eec\u8ba9\u5b50\u8fdb\u7a0b\u518dfork\u4e00\u6b21\uff0c\u5f97\u5230\u4e00\u4e2a\u5b59\u5b50\u8fdb\u7a0b\uff0c\u7136\u540e\u7ed3\u675f\u5b50\u8fdb\u7a0b\uff0c\u8fd9\u6837\u5b59\u5b50\u8fdb\u7a0b\u5c31\u6210\u4e86\u5b64\u513f\u8fdb\u7a0b\uff0c\u5b83\u4f1a\u88ab1\u53f7\u8fdb\u7a0b\u56de\u6536\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5e76\u6ca1\u6709\u4ea7\u751f\u50f5\u5c38\u8fdb\u7a0b\uff0c\u8fd9\u4e2a\u95ee\u9898\u5c31\u89e3\u51b3\u4e86\u3002<\/p>\n

#include<stdio.h> #include<sys\/socket.h> #include<netinet\/in.h> #include<errno.h> #include<sys\/types.h> #include<unistd.h> #include<string.h> #include<stdlib.h> #define _PORT_ 9999 #define _BACKLOG_ 10 int main() { int sock = socket(AF_INET, SOCK_STREAM,0); if (sock < 0) { printf("socket error, errno is %d, errstring is %sn", errno, strerror(errno)); } struct sockaddr_in server_sock; struct sockaddr_in client_sock; bzero(&server_sock, sizeof(server_sock)); server_sock.sin_family = AF_INET; server_sock.sin_addr.s_addr = htonl(INADDR_ANY); server_sock.sin_port = htons(_PORT_); if (bind(sock, (struct sockaddr*)&server_sock, sizeof(struct sockaddr_in))< 0) { printf("bind error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 1; } if (listen(sock, _BACKLOG_)< 0) { printf("listen error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 2; } printf("bind and listen success, wait accept!n"); while (1) { socklen_t len = 0; int client_socket = accept(sock, (struct sockaddr*)&client_sock,&len); if (client_socket < 0) { printf("accept error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 3; } char buf_ip[INET_ADDRSTRLEN]; memset(buf_ip, 0, sizeof(buf_ip)); inet_ntop(AF_INET, &client_sock.sin_addr, buf_ip, sizeof(buf_ip)); printf("get connection :ip is %s, port is %dn ",buf_ip, ntohs(client_sock.sin_port) ); pid_t id = fork(); if (id<0) { perror("fork"); } else if(id == 0) { close(sock); pid_t idd = fork(); if (idd < 0) { perror("second fork"); exit(5); } else if (idd == 0) { while (1) { char buf[1024]; memset(buf, 0, sizeof(buf)); read(client_socket, buf, sizeof(buf)); printf("client# : %sn", buf); printf("server# :"); memset(buf, 0, sizeof(buf)); fgets(buf, sizeof(buf), stdin); buf[strlen(buf) – 1 ]= \\\\\\’?\\\\\\’; write(client_socket, buf, strlen(buf) 1); printf("please wait …n"); } } else { exit(6); } } else { close(client_socket); waitpid(id, NULL,0); } } close(sock); return 0; } \u591a\u7ebf\u7a0b\u670d\u52a1\u5668<\/p>\n

\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5c31\u662f\u5c06\u901a\u4fe1\u90e8\u5206\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u5904\u7406\uff0c\u4e3a\u4e86\u907f\u514d\u7ebf\u7a0b\u9000\u51fa\u65f6\u6574\u4e2a\u8fdb\u7a0b\u9000\u51fa\uff0c\u6211\u4eec\u5c06\u7ebf\u7a0b\u5206\u79bb\u51fa\u53bb\u3002<\/p>\n

#include<stdio.h> #include<sys\/socket.h> #include<netinet\/in.h> #include<errno.h> #include<sys\/types.h> #include<unistd.h> #include<string.h> #define _PORT_ 9999 #define _BACKLOG_ 10 void request(void* arg) { int new_fd = (int )arg; char buf_ip[INET_ADDRSTRLEN]; memset(buf_ip, 0, sizeof(buf_ip)); inet_ntop(AF_INET, &client_sock.sin_addr, buf_ip, sizeof(buf_ip)); printf("get connection :ip is %s, port is %dn ",buf_ip, ntohs(client_sock.sin_port) ); while (1) { char buf[1024]; memset(buf, 0, sizeof(buf)); read(client_socket, buf, sizeof(buf)); printf("client# : %sn", buf); printf("server# :"); memset(buf, 0, sizeof(buf)); fgets(buf, sizeof(buf), stdin); buf[strlen(buf) – 1 ]= \\\\\\’?\\\\\\’; write(client_socket, buf, strlen(buf) 1); printf("please wait …n"); } } } int main() { int sock = socket(AF_INET, SOCK_STREAM,0); if (sock < 0) { printf("socket error, errno is %d, errstring is %sn", errno, strerror(errno)); } struct sockaddr_in server_sock; struct sockaddr_in client_sock; bzero(&server_sock, sizeof(server_sock)); server_sock.sin_family = AF_INET; server_sock.sin_addr.s_addr = htonl(INADDR_ANY); server_sock.sin_port = htons(_PORT_); if (bind(sock, (struct sockaddr*)&server_sock, sizeof(struct sockaddr_in))< 0) { printf("bind error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 1; } if (listen(sock, _BACKLOG_)< 0) { printf("listen error, errno is %d, errstring is %sn", errno, strerror(errno)); close(sock); return 2; } printf("bind and listen success, wait accept!n"); pthread_t id; pthread_create(&id, NULL, request, (void*)new_fd ); pthread_detach(id); close(sock); return 0; } bind\u5931\u8d25\u7684\u539f\u56e0<\/p>\n

\u5f53\u4e24\u4e2a socket \u7684 address \u548c port \u76f8\u51b2\u7a81\uff0c\u800c\u4f60\u53c8\u60f3\u91cd\u7528\u5730\u5740\u548c\u7aef\u53e3\uff0c\u5219\u65e7\u7684 socket \u548c\u65b0\u7684 socket \u90fd\u8981\u5df2\u7ecf\u88ab\u8bbe\u7f6e\u4e86 SO_REUSEADDR \u7279\u6027\uff0c\u53ea \u6709\u4e24\u8005\u4e4b\u4e00\u6709\u8fd9\u4e2a\u7279\u6027\u8fd8\u662f\u6709\u95ee\u9898\u7684\u3002
SO_REUSEADDR \u53ef\u4ee5\u7528\u5728\u4ee5\u4e0b\u56db\u79cd\u60c5\u51b5\u4e0b\u3002
( \u6458\u81ea\u300a Unix \u7f51\u7edc\u7f16\u7a0b\u300b\u5377\u4e00\uff0c\u5373 UNPv1)
1 \u3001\u5f53\u6709\u4e00\u4e2a\u6709\u76f8\u540c\u672c\u5730\u5730\u5740\u548c\u7aef\u53e3\u7684 socket1 \u5904\u4e8e TIME_WAIT \u72b6\u6001\u65f6\uff0c\u800c\u4f60\u542f
\u52a8\u7684\u7a0b\u5e8f\u7684 socket2 \u8981\u5360\u7528\u8be5\u5730\u5740\u548c\u7aef\u53e3\uff0c\u4f60\u7684\u7a0b\u5e8f\u5c31\u8981\u7528\u5230\u8be5\u9009\u9879\u3002
2 \u3001 SO_REUSEADDR \u5141\u8bb8\u540c\u4e00 port \u4e0a\u542f\u52a8\u540c\u4e00\u670d\u52a1\u5668\u7684\u591a\u4e2a\u5b9e\u4f8b ( \u591a\u4e2a\u8fdb\u7a0b ) \u3002\u4f46
\u6bcf\u4e2a\u5b9e\u4f8b\u7ed1\u5b9a\u7684 IP \u5730\u5740\u662f\u4e0d\u80fd\u76f8\u540c\u7684\u3002\u5728\u6709\u591a\u5757\u7f51\u5361\u6216\u7528 IP Alias \u6280\u672f\u7684\u673a\u5668\u53ef
\u4ee5\u6d4b\u8bd5\u8fd9\u79cd\u60c5\u51b5\u3002
3 \u3001 SO_REUSEADDR \u5141\u8bb8\u5355\u4e2a\u8fdb\u7a0b\u7ed1\u5b9a\u76f8\u540c\u7684\u7aef\u53e3\u5230\u591a\u4e2a socket \u4e0a\uff0c\u4f46\u6bcf\u4e2a soc
ket \u7ed1\u5b9a\u7684 ip \u5730\u5740\u4e0d\u540c\u3002\u8fd9\u548c 2 \u5f88\u76f8\u4f3c\uff0c\u533a\u522b\u8bf7\u770b UNPv1 \u3002
4 \u3001 SO_REUSEADDR \u5141\u8bb8\u5b8c\u5168\u76f8\u540c\u7684\u5730\u5740\u548c\u7aef\u53e3\u7684\u91cd\u590d\u7ed1\u5b9a\u3002\u4f46\u8fd9\u53ea\u7528\u4e8e UDP \u7684
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