{"id":43935,"date":"2025-06-16T08:15:55","date_gmt":"2025-06-16T00:15:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/43935.html"},"modified":"2025-06-16T08:15:55","modified_gmt":"2025-06-16T00:15:55","slug":"%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8btcp%e8%bf%9e%e6%8e%a5%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%8eudp%e8%bf%9e%e6%8e%a5%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/43935.html","title":{"rendered":"\u7f51\u7edc\u7f16\u7a0bTCP\u8fde\u63a5\u670d\u52a1\u5668\u4e0eUDP\u8fde\u63a5\u670d\u52a1\u5668"},"content":{"rendered":"

\u7f51\u7edc\u7f16\u7a0bTCP\u8fde\u63a5\u670d\u52a1\u5668\u4e0eUDP\u8fde\u63a5\u670d\u52a1\u5668<\/h2>\n

\u7f51\u7edc\u7f16\u7a0b\u76f8\u5173\u77e5\u8bc6<\/h3>\n

\u5c40\u57df\u7f51\u548c\u5e7f\u57df\u7f51\u7684\u6982\u5ff5<\/h4>\n

\u5c40\u57df\u7f51：<\/p>\n

\u4e00\u822c\u662f\u7531\u8fde\u5728\u4e00\u4e2a\u8def\u7531\u5668\u4e0b\u7684\u8bbe\u5907\u7ec4\u6210\u7684\u4e00\u4e2a\u7f51\u7edc<\/p>\n

\u5e7f\u57df\u7f51<\/p>\n

\u5c06\u4e00\u4e2a\u4e2a\u7684\u5c40\u57df\u7f51\u8fde\u63a5\u5728\u4e00\u5757\u7ec4\u6210\u7f51\u7edc<\/p>\n

\u94fe\u63a5\u4e00\u4e2a\u670d\u52a1\u5668\u7684\u6d41\u7a0b<\/h4>\n

1）\u5728\u6d4f\u89c8\u5668\u8f93\u5165\u8981\u8bbf\u95ee\u7684\u7f51\u5740https:\/\/github.com\/<\/p>\n

2）\u6d4f\u89c8\u5668\u4f1a\u5148\u53bb\u8bbf\u95ee dns \u5730\u5740\u89e3\u6790\u670d\u52a1\u5668\u62ff\u5230\u57df\u540d\u5bf9\u5e94\u7684 ip<\/p>\n

3）\u901a\u8fc7 ip \u5730\u5740\u627e\u5230\u670d\u52a1\u5668<\/p>\n

4）\u670d\u52a1\u5668\u4f1a\u56de\u6570\u636e\u7ed9\u6d4f\u89c8\u5668<\/p>\n

5）\u6d4f\u89c8\u5668\u4f1a\u5c06\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u8fdb\u884c\u6574\u7406<\/p>\n

ip \u5730\u5740\u7684\u5206\u7c7b<\/h4>\n

IPv4 \u51fa\u73b0\u7684\u65f6\u95f4\u6bd4\u8f83\u4e45 IPv4 \u5730\u5740\u7684\u6570\u76ee 2^32，ipv4 \u7684\u5730\u5740\u5927\u6982\u5728 2015 \u5e74\u5de6\u53f3\u5c31\u5206\u914d\u5b8c\u4e86<\/p>\n

IPv6 \u5171\u6709 16 \u5b57\u8282 128 \u4f4d 2^128，\u4e3a\u5730\u7403\u4e0a\u7684\u6bcf\u4e00\u7c92\u6c99\u5b50\u5206\u914d\u4e00\u4e2a ip \u5730\u5740<\/p>\n

IPv4 \u5730\u5740\u7684\u5206\u7c7b<\/h5>\n
A \u7c7b\u5730\u5740<\/h6>\n

\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f\u56fa\u5b9a\u7684\u540e\u4e09\u4e2a\u5b57\u8282\u662f\u53ef\u53d8\u7684<\/p>\n

1.0.0.0-127.255.255.255<\/p>\n

\u5171\u6709 127 \u4e2a A \u7c7b\u5730\u5740<\/p>\n

\u4e00\u4e2a A \u7c7b\u5730\u5740 \u53ef\u4ee5\u63a5 2^24 \u4e2a\u8bbe\u5907，\u4e00\u822c\u7528\u4e8e\u5927\u578b\u6216\u8005\u8d85\u5927\u578b\u7684\u516c\u53f8<\/p>\n

B \u7c7b\u5730\u5740<\/h6>\n

\u524d\u4e24\u4e2a\u5b57\u8282\u662f\u56fa\u5b9a\u7684 \u540e\u4e24\u4e2a\u5b57\u8282\u662f\u53ef\u53d8\u7684<\/p>\n

128.0.0.0-191.255.255.255<\/p>\n

\u4e00\u822c\u7528\u4e8e\u4e2d\u578b\u7684\u516c\u53f8，\u6bcf\u4e2a B \u7c7b\u5730\u5740\u53ef\u63a5 2^16 \u4e2a\u8bbe\u5907<\/p>\n

C \u7c7b\u5730\u5740<\/h6>\n

\u524d\u4e09\u4e2a\u5b57\u8282\u662f\u56fa\u5b9a\u7684\u540e\u4e00\u4e2a\u5b57\u8282\u662f\u53ef\u53d8\u7684<\/p>\n

192.0.0.0-223.255.255.255<\/p>\n

\u4e00\u822c\u7528\u4e8e\u5c40\u57df\u7f51 \u4e5f\u662f\u6211\u4eec\u65e5\u5e38\u751f\u6d3b\u4e2d\u6bd4\u8f83\u5e38\u89c1\u7684 ip \u5730\u5740<\/p>\n

D \u7c7b\u5730\u5740<\/h6>\n

224.0.0.0-239.255.255.255<\/p>\n

\u7ec4\u64ad\u5e7f\u64ad\u7684\u5730\u5740<\/p>\n

E \u7c7b\u5730\u5740<\/h6>\n

240.0.0.0-255.255.255.255 \u4fdd\u7559\u5730\u5740<\/p>\n

\u7aef\u53e3\u53f7<\/h4>\n

\u7528\u6765\u5bf9\u8fdb\u7a0b\u505a\u533a\u5206\u7684，\u7531\u4e8e\u7f51\u7edc\u7f16\u7a0b\u662f\u8de8\u4e3b\u673a\u7684\u8fdb\u7a0b\u95f4\u7684\u901a\u8baf，\u4e0d\u80fd\u7528\u8fdb\u7a0b\u53f7\u6765\u5bf9\u8fdb\u7a0b\u8fdb\u884c\u533a\u5206<\/p>\n

\u7aef\u53e3\u53f7\u662f\u4e00\u4e2a 16 \u4f4d\u65e0\u7b26\u53f7\u6574\u578b\u6570<\/p>\n

\u8303\u56f4：0-65535<\/p>\n

0-1023 ：\u88ab\u7cfb\u7edf\u5360\u7528<\/p>\n

1024 \u2013 65535：\u53ef\u4ee5\u4f7f\u7528\u7684<\/p>\n

\u7f51\u7edc\u5b57\u8282\u5e8f<\/h4>\n

\u5728\u6574\u4e2a\u7f16\u7a0b\u754c\u53ef\u4ee5\u63a5\u89e6\u5230\u7684\u5b57\u8282\u5e8f\u4e3b\u8981\u6709\u4e24\u79cd<\/p>\n

\u5927\u7aef\u6a21\u5f0f<\/p>\n

\u5728\u7f51\u7edc\u901a\u8baf\u91cc\u4e00\u822c\u4f7f\u7528\u7684\u662f\u5927\u7aef\u6a21\u5f0f<\/p>\n

\u9ad8\u5b57\u8282\u5b58\u653e\u5728\u4f4e\u5730\u5740\u4f4d<\/p>\n

\u4f4e\u5b57\u8282\u5b58\u653e\u5728\u9ad8\u5730\u5740\u4f4d<\/p>\n

\u5c0f\u7aef\u6a21\u5f0f<\/p>\n

\u5728 x86 \u4e3b\u673a\u4e0a\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662f\u5c0f\u7aef\u6a21\u5f0f<\/p>\n

\u9ad8\u5b57\u8282\u5b58\u5728\u9ad8\u5730\u5740\u4f4d<\/p>\n

\u4f4e\u5b57\u8282\u5b58\u653e\u5728\u4f4e\u5730\u5740\u4f4d<\/p>\n

\u5ba2\u6237\u7aef\u94fe\u63a5\u670d\u52a1\u7aef\u7684\u65b9\u5f0f<\/h4>\n

TCP：<\/p>\n

\u9762\u5411\u94fe\u63a5，\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93 \u4f20\u8f93\u901f\u5ea6\u76f8\u5bf9\u8f83\u6162<\/p>\n

UDP<\/p>\n

\u9762\u5411\u975e\u8fde\u63a5\u7684 \u4e0d\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93 \u4f20\u8f93\u901f\u5ea6\u76f8\u5bf9\u8f83\u5feb<\/p>\n

TCP \u7684\u4e09\u6b21\u63e1\u624b<\/h4>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u5957\u63a5\u5b57<\/h4>\n

\u5957\u63a5\u5b57\u7684\u672c\u8d28\u5c31\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

\u53ef\u4ee5\u8bfb\u4e5f\u53ef\u4ee5\u5199<\/p>\n

\u8bfb\u6216\u8005\u5199\u7684\u65f6\u5019\u53ef\u4ee5\u91c7\u7528 read \u548c write<\/p>\n

\u4e5f\u53ef\u4ee5\u91c7\u7528 \u5957\u63a5\u5b57\u4e13\u7528\u7684\u51fd\u6570 send \u548c recv<\/p>\n

\u7279\u6b8a\u5728\u5957\u63a5\u5b57\u53ef\u4ee5\u7ed1\u5b9a ip \u7aef\u53e3<\/p>\n

TCP \u7684\u670d\u52a1\u7aef\u6a21\u578b<\/h3>\n

\"\"<\/p>\n

\u521b\u5efa\u5957\u63a5\u5b57<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES *\/<\/p>\n

#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

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

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int domain, IP \u5730\u5740\u7684\u7c7b\u578b<\/p>\n

AF_INET ipv4<\/p>\n

AF_INET6 ipv6<\/p>\n

int type, \u5957\u63a5\u5b57\u7684\u7c7b\u578b<\/p>\n

SOCK_STREAM \u6d41\u5f0f\u5957\u63a5\u5b57 TCP<\/p>\n

SOCK_DGRAM \u6570\u636e\u62a5 UDP<\/p>\n

int protocol 0<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u5957\u63a5\u5b57<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u7ed1\u5b9a ip \u7aef\u53e3\u4fe1\u606f<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES <\/p>\n

#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

int bind(int sockfd, const struct sockaddr *addr,socklen_t addrlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u670d\u52a1\u7aef\u672c\u8eab\u5957\u63a5\u5b57<\/p>\n

const struct sockaddr *addr, \u670d\u52a1\u7aef\u7684 ip \u5730\u5740\u7aef\u53e3\u4fe1\u606f\u7ed3\u6784\u4f53<\/p>\n

socklen_t addrlen \u7ed3\u6784\u4f53\u7684\u957f\u5ea6<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de 0<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

struct sockaddr
\n{
\n sa_family_t sa_family; ip \u5730\u5740\u7684\u7c7b\u578b
\n char sa_data[14]; \u5305\u542b\u4e86 ip \u5730\u5740\u548c\u7aef\u53e3\u7684\u5b57\u7b26\u4e32
\n }<\/p>\n

struct sockaddr_in
\n{
\n sa_family_t sin_family; ip \u5730\u5740\u7684\u7c7b\u578b
\n in_port_t sin_port; \u7aef\u53e3\u53f7
\n struct in_addr sin_addr; ip \u5730\u5740\u7684\u7ed3\u6784\u4f53
\n };<\/p>\n

struct in_addr
\n{
\n uint32_t s_addr; ip \u5730\u5740
\n };<\/p>\n

\u5c06\u5c0f\u7aef\u7684\u7aef\u53e3\u53f7\u8f6c\u6362\u6210\u5927\u7aef<\/h4>\n

\u51fd\u6570\u7684\u529f\u80fd<\/p>\n

\u5c06\u5c0f\u7aef\u7684\u7aef\u53e3\u8f6c\u6362\u6210\u5927\u7aef<\/p>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <arpa\/inet.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

uint16_t htons(uint16_t hostshort);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

uint16_t hostshort：\u8981\u8f6c\u6362\u7684\u5c0f\u7aef\u7684\u7aef\u53e3<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u5927\u7aef\u7684\u7aef\u53e3\u53f7<\/p>\n

\u5c06\u5c0f\u7aef\u7684 ip \u5730\u5740\u8f6c\u6362\u6210\u5927\u7aef\u7684 ip \u5730\u5740<\/h4>\n

\u51fd\u6570\u7684\u529f\u80fd<\/p>\n

\u5c06\u5c0f\u7aef\u7684 ip \u8f6c\u6362\u6210\u5927\u7aef\u7684 ip<\/p>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/socket.h><\/p>\n

#include <netinet\/in.h><\/p>\n

#include <arpa\/inet.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

in_addr_t inet_addr(const char *cp);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

const char *cp：\u5c0f\u7aef\u7684 ip \u5730\u5740<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u5927\u7aef\u7684 ip \u5730\u5740<\/p>\n

\u76d1\u542c\u7f51\u7edc<\/h4>\n

\u51fd\u6570\u7684\u529f\u80fd<\/p>\n

\u76d1\u542c\u7f51\u7edc<\/p>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES *\/<\/p>\n

#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

int listen(int sockfd, int backlog);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u670d\u52a1\u7aef\u672c\u8eab\u7684\u5957\u63a5\u5b57<\/p>\n

int backlog \u6700\u5927\u76d1\u542c\u6570<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de 0<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u63a5\u53d7\u5ba2\u6237\u7aef\u7684\u94fe\u63a5<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES *\/<\/p>\n

#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u670d\u52a1\u7aef\u672c\u8eab\u7684\u5957\u63a5\u5b57<\/p>\n

struct sockaddr *addr, \u5ba2\u6237\u7aef\u7684 ip \u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53<\/p>\n

socklen_t *addrlen \u7ed3\u6784\u4f53\u957f\u5ea6\u7684\u6307\u9488<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u4e13\u95e8\u7528\u6765\u7ed9\u5ba2\u6237\u7aef\u901a\u8baf\u7684\u5957\u63a5\u5b57<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u6536\u53d1\u6d88\u606f<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

ssize_t send(int sockfd, const void *buf, size_t len, int flags);
\nssize_t recv(int sockfd, void *buf, size_t len, int flags);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

sockfd ： \u7528\u6765\u901a\u8baf\u7684\u5957\u63a5\u5b57<\/p>\n

buf： \u53d1\u9001\/\u63a5\u6536\u6d88\u606f\u7684\u5b58\u653e\u7684\u4f4d\u7f6e<\/p>\n

len： \u8981\u6536\u53d1\u7684\u6d88\u606f\u7684\u5927\u5c0f<\/p>\n

flags： \u6807\u5fd7 0 \u963b\u585e\u7684\u6536\u53d1<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u6210\u529f\u53d1\u9001\/\u63a5\u6536\u7684\u5b57\u8282\u6570<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u5c06\u5927\u7aef\u5730\u5740\u8f6c\u6362\u5c0f\u7aef\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 ip \u5730\u5740<\/h4>\n

\u5c06\u5927\u7aef\u7684\u5730\u5740\u8f6c\u6362\u6210\u5c0f\u7aef<\/p>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

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

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

char *inet_ntoa(struct in_addr in);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

struct in_addr in： \u7528\u6765\u5b58\u653e\u5927\u7aef\u7684 ip \u5730\u5740\u7684\u7ed3\u6784\u4f53<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u5c0f\u7aef\u7684 ip \u5730\u5740<\/p>\n

\u5931\u8d25\u8fd4\u56de NULL<\/p>\n

\u5b9e\u4f8b<\/h4>\n

#include <stdio.h>
\n#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <unistd.h>\/\/\u670d\u52a1\u7aef<\/p>\n

int sfd,cfd,ret;<\/p>\n

struct sockaddr_in seraddr;
\nstruct sockaddr_in cliaddr;
\nsocklen_t len=sizeof(cliaddr);
\nchar buf[10]={0};
\nint main()
\n{
\n sfd = socket(AF_INET,SOCK_STREAM,0);\/\/1.\u521b\u5efa\u5957\u63a5\u5b57
\n if(sfd < 0)
\n {
\n perror("socket");
\n return -1;
\n }<\/p>\n

seraddr.sin_family=AF_INET;\/\/\u5730\u5740\u7c7b\u578b
\n \/\/\u7aef\u53e3\u53f7\/\/\u8f6c\u6362\u5c0f\u7aef\u5230\u5927\u7aef
\n seraddr.sin_port=htons(4444);
\n \/\/\u5c06\u5c0f\u7aefIP\u8f6c\u6362\u4e3a\u5927\u7aefIP
\n seraddr.sin_addr.s_addr=inet_addr("192.168.39.201");
\n \/\/2.\u7ed1\u5b9a ip \u7aef\u53e3\u4fe1\u606f
\n ret= bind(sfd, (struct sockaddr *)&seraddr,sizeof(seraddr));
\n if(ret < 0)
\n {
\n perror("bind");
\n return -1;
\n }<\/p>\n

\/\/3.\u76d1\u542c\u7f51\u7edc
\n ret = listen(sfd,10);
\n if(ret < 0)
\n {
\n perror("listen");
\n return -1;
\n }<\/p>\n

\/\/4.\u63a5\u53d7\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42
\n cfd=accept(sfd,(struct sockaddr *)&cliaddr,&len);
\n if(cfd < 0)
\n {
\n perror("accept");
\n return -1;
\n }
\n \/\/\u5c06\u5927\u7aef\u7684\u5730\u5740\u8f6c\u6362\u4e3a\u5c0f\u7aef\u6a21\u5f0f
\n printf("\u5ba2\u6237\u7aefIP:%s\\\\n",inet_ntoa(cliaddr.sin_addr));<\/p>\n

\/\/ write(cfd,"LQHXX",6);
\n send(cfd,"LQHXXX",7,0);<\/p>\n

\/\/ read(cfd,buf,10);
\n recv(cfd,buf,10,0);
\n printf("buf=%s\\\\n",buf);<\/p>\n

close(cfd);\/\/\u5173\u95ed\u5957\u63a5\u5b57
\n close(sfd);
\n return 0;
\n}<\/p>\n

TCP \u7684\u5ba2\u6237\u7aef\u6a21\u578b<\/h3>\n

\u521b\u5efa\u5957\u63a5\u5b57<\/h4>\n

\u8fde\u63a5\u670d\u52a1\u5668<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES *\/
\n #include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u5957\u63a5\u5b57<\/p>\n

const struct sockaddr *addr, \u670d\u52a1\u5668\u7684 ip \u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53<\/p>\n

socklen_t addrlen \u7ed3\u6784\u4f53\u7684\u5927\u5c0f<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de 0<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u63a5\u6536\u6d88\u606f<\/h4>\n

\u53d1\u9001\u6d88\u606f<\/h4>\n

\u5173\u95ed\u5957\u63a5\u5b57<\/h4>\n

\u5b9e\u4f8b<\/h4>\n

#include <stdio.h>
\n#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <unistd.h>
\n\/\/\u5ba2\u6237\u7aef<\/p>\n

int fd,ret;
\nstruct sockaddr_in seraddr;\/\/\u670d\u52a1\u7aef\u5730\u5740\u4fe1\u606f<\/p>\n

char buf[10]={0};
\nint main()
\n{<\/p>\n

fd = socket(AF_INET,SOCK_STREAM,0);\/\/1.\u521b\u5efa\u5957\u63a5\u5b57
\n if(fd < 0)
\n {
\n perror("socket");
\n return -1;
\n }
\n \/\/ \u8fde\u63a5\u670d\u52a1\u5668
\n seraddr.sin_family = AF_INET;
\n seraddr.sin_port = htons(4444);\/\/\u670d\u52a1\u7aef\u7aef\u53e3
\n seraddr.sin_addr.s_addr = inet_addr("192.168.39.201");
\n ret = connect(fd,(struct sockaddr *)&seraddr,sizeof(seraddr));
\n if(ret < 0)
\n {
\n perror("connect");
\n return -1;
\n }
\n\/\/\u8bfb\u53d6\u6d88\u606f
\n read(fd,buf,10);
\n printf("buf=%s\\\\n",buf);
\n\/\/\u5199\u6d88\u606f
\n write(fd,"nihao\\\\n",6);<\/p>\n

\/\/\u5173\u95ed\u5957\u63a5\u5b57
\n close(fd);
\n return 0;
\n}<\/p>\n

UDP \u7684\u901a\u8baf\u6d41\u7a0b<\/h3>\n

\u521b\u5efa\u5957\u63a5\u5b57<\/h4>\n

\u7ed1\u5b9a\u81ea\u5df1\u7684\u4fe1\u606f<\/h4>\n

\u6536\u6d88\u606f<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h>
\n#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags,struct sockaddr *src_addr, socklen_t *addrlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u5957\u63a5\u5b57<\/p>\n

void *buf, \u63a5\u6536\u5230\u7684\u6d88\u606f\u5b58\u653e\u7684\u7f13\u51b2\u533a<\/p>\n

size_t len, \u8981\u63a5\u53d7\u7684\u6d88\u606f\u7684\u957f\u5ea6<\/p>\n

int flags, \u6807\u5fd7 0 \u963b\u585e\u7684\u6536<\/p>\n

struct sockaddr *src_addr, \u53d1\u6765\u6d88\u606f\u7684\u5bf9\u8c61\u7684 ip \u7aef\u53e3\u4fe1\u606f\u7ed3\u6784\u4f53<\/p>\n

socklen_t *addrlen \u5bf9\u65b9\u7684 ip \u5730\u5740\u4fe1\u606f\u7684\u957f\u5ea6<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de\u6210\u529f\u63a5\u6536\u7684\u5b57\u8282\u6570<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u53d1\u6d88\u606f<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,const struct sockaddr *dest_addr, socklen_t addrlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u5957\u63a5\u5b57<\/p>\n

const void *buf, \u8981\u53d1\u9001\u7684\u6d88\u606f\u5b58\u653e\u7684\u7f13\u51b2\u533a<\/p>\n

size_t len, \u8981\u53d1\u9001\u7684\u6d88\u606f\u7684\u957f\u5ea6<\/p>\n

int flags, 0 \u963b\u585e\u7684\u53d1<\/p>\n

const struct sockaddr *dest_addr, \u8981\u53d1\u9001\u7684\u5bf9\u8c61\u7684 ip \u5730\u5740\u4fe1\u606f\u7ed3\u6784\u4f53<\/p>\n

socklen_t addrlen \u4fe1\u606f\u7ed3\u6784\u4f53\u7684\u5927\u5c0f<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de \u6210\u529f\u53d1\u9001\u7684\u5b57\u8282\u6570<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u5173\u95ed\u5957\u63a5\u5b57<\/h4>\n

\u5b9e\u4f8b<\/h3>\n

#include <stdio.h>
\n#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <unistd.h><\/p>\n

int fd,ret;
\nstruct sockaddr_in seraddr,cliaddr;
\nsocklen_t len = sizeof(cliaddr);
\nchar buf[10]={0};
\nint main()
\n{<\/p>\n

\/\/1\u521b\u5efa\u5957\u63a5\u5b57
\n fd = socket(AF_INET,SOCK_DGRAM,0);
\n if(fd < 0)
\n {
\n perror("socket");
\n return -1;
\n }
\n\/\/\u7ed1\u5b9aIP\u4fe1\u606f
\nseraddr.sin_family = AF_INET;
\nseraddr.sin_port = htons(5555);
\nseraddr.sin_addr.s_addr = inet_addr("192.168.39.201");
\nret = bind(fd,(struct sockaddr *)&seraddr,sizeof(seraddr));
\n if(ret < 0)
\n {
\n perror("bind");
\n return -1;
\n }
\n \/\/ \u6536\u6d88\u606f
\n recvfrom(fd,buf,10,0,(struct sockaddr *)&cliaddr, &len);
\n printf("buf=%s\\\\n",buf);<\/p>\n

\/\/ \u53d1\u4fe1\u606f
\n sendto(fd,"LQHXX",6, 0,(struct sockaddr *)&cliaddr, sizeof(cliaddr));\/\/\u4f5c\u4e3a\u670d\u52a1\u7aef<\/p>\n

close(fd);
\n return 0;
\n}<\/p>\n

UDP \u7684\u7ec4\u64ad<\/h3>\n

\u7ec4\u64ad<\/h4>\n

\u4e00\u4e2a\u6d88\u606f\u7684\u53d1\u9001\u8005\u53d1\u9001\u6d88\u606f<\/p>\n

\u52a0\u5165\u5230\u591a\u64ad\u7ec4\u7684\u6240\u6709\u7528\u6237\u90fd\u80fd\u542c\u5230<\/p>\n

\u672c\u6765 udp \u901a\u8baf\u5c31\u652f\u6301\u7ec4\u64ad<\/p>\n

\u9ed8\u8ba4 udp \u7684\u7ec4\u64ad\u4ed6\u7684\u5c5e\u6027\u662f\u88ab\u5173\u95ed\u6389\u4e86<\/p>\n

\u8981\u60f3\u80fd\u591f\u4f7f\u7528\u7ec4\u64ad<\/p>\n

\u5c31\u9700\u8981\u5148\u5c06\u8fd9\u4e2a\u5c5e\u6027\u6253\u5f00<\/p>\n

\u8981\u60f3\u6253\u5f00\u8fd9\u4e2a\u5c5e\u6027\u5c31\u5fc5\u987b\u501f\u52a9\u4e8e\u4e00\u4e2a\u51fd\u6570<\/p>\n

setsockopt()<\/p>\n

\u7ec4\u64ad\u8fd8\u9700\u8981\u4e00\u4e2a\u7279\u6b8a\u7684 ip \u5730\u5740<\/p>\n

224.0.0.0-239.255.255.255<\/p>\n

\u8bbe\u7f6e\u5957\u63a5\u5b57\u7684\u5c5e\u6027<\/h4>\n

\u51fd\u6570\u7684\u5934\u6587\u4ef6<\/p>\n

#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h><\/p>\n

\u51fd\u6570\u7684\u539f\u578b<\/p>\n

int setsockopt(int sockfd, int level, int optname,
\n const void *optval, socklen_t optlen);<\/p>\n

\u51fd\u6570\u7684\u53c2\u6570<\/p>\n

int sockfd, \u8981\u8bbe\u7f6e\u5c5e\u6027\u7684\u5957\u63a5\u5b57<\/p>\n

int level, \u7f51\u7edc\u7684\u5c42<\/p>\n

IPPROTO_IP<\/p>\n

SOL_SOCKET<\/p>\n

int optname, \u8981\u8bbe\u7f6e\u7684\u5c5e\u6027\u7684\u540d\u5b57<\/p>\n

IP_ADD_MEMBERSHIP \u52a0\u5165\u591a\u64ad\u7ec4<\/p>\n

IP_MULTICAST_IF \u521b\u5efa\u591a\u64ad\u7ec4<\/p>\n

SO_BROADCAST \u6253\u5f00\u5e7f\u64ad<\/p>\n

SO_REUSEADDR ip \u5730\u5740\u590d\u7528<\/p>\n

const void *optval, \u5c5e\u6027\u76f8\u5173\u7684\u53c2\u6570<\/p>\n

socklen_t optlen \u53c2\u6570\u7684\u5927\u5c0f<\/p>\n

\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/p>\n

\u6210\u529f\u8fd4\u56de 0<\/p>\n

\u5931\u8d25\u8fd4\u56de -1<\/p>\n

\u5b9e\u4f8b<\/h4>\n

\u521b\u5efa\u591a\u64ad\u7ec4<\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <net\/if.h>
\n#include <unistd.h>
\n#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <unistd.h>
\n\/\/\u521b\u5efa\u591a\u64ad\u7ec4
\nint sfd,ret;
\nstruct ip_mreqn mygrop;
\nstruct sockaddr_in addr;
\nint main()<\/p>\n

{
\n sfd = socket(AF_INET,SOCK_DGRAM,0);\/\/1.\u521b\u5efa\u5957\u63a5\u5b57
\n if(sfd < 0)
\n {
\n perror("socket");
\n return -1;
\n }<\/p>\n

mygrop.imr_multiaddr.s_addr = inet_addr("224.224.224.224");\/\/\u7ec4\u64ad\u5730\u5740
\n mygrop.imr_address.s_addr = inet_addr("192.168.39.201"); \/\/\u670d\u52a1\u5668\u5730\u5740
\n mygrop.imr_ifindex= if_nametoindex("ens33");\/\/\u7f51\u5361<\/p>\n

ret = setsockopt(sfd, IPPROTO_IP, IP_MULTICAST_IF,
\n &mygrop,sizeof(mygrop));<\/p>\n

if(ret< 0)
\n {
\n perror("setsockopt");
\n return -1;
\n }<\/p>\n

while(1)
\n {
\n addr.sin_family = AF_INET;\/\/IPV4
\n addr.sin_port = htons(4444);
\n addr.sin_addr.s_addr = inet_addr("224.224.224.224");\/\/\u7ec4\u64ad\u5730\u5740
\n sendto(sfd,"LQHXX",6,0,(struct sockaddr *)&addr,sizeof(addr));
\n sleep(1);
\n }
\n return 0;<\/p>\n

}<\/p>\n

\u52a0\u5165\u4e00\u4e2a\u591a\u64ad\u7ec4<\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <net\/if.h>
\n#include <unistd.h>
\n#include <sys\/types.h> \/* See NOTES *\/
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <unistd.h>
\n\/\/\u52a0\u591a\u64ad\u7ec4
\nint sfd,ret;
\nstruct ip_mreqn mygrop;
\nstruct sockaddr_in cliaddr,addr;
\nsocklen_t len = sizeof(struct sockaddr_in);
\nint main()<\/p>\n

{
\n sfd = socket(AF_INET,SOCK_DGRAM,0);\/\/1.\u521b\u5efa\u5957\u63a5\u5b57
\n if(sfd < 0)
\n {
\n perror("socket");
\n return -1;
\n }<\/p>\n

\/\/\u7ed1\u5b9a\u81ea\u5df1\u7684IP\u4fe1\u606f
\n cliaddr.sin_family = AF_INET;
\n cliaddr.sin_port = htons(4444);
\n cliaddr.sin_addr.s_addr = inet_addr("0.0.0.0");
\n ret = bind(sfd ,(struct sockaddr *)&cliaddr,sizeof(cliaddr));<\/p>\n

\/\/\u52a0\u5165\u7ec4\u64ad
\n mygrop.imr_multiaddr.s_addr = inet_addr("224.224.224.224");\/\/\u7ec4\u64ad\u5730\u5740
\n mygrop.imr_address.s_addr = inet_addr("192.168.39.201"); \/\/\u670d\u52a1\u5668\u5730\u5740
\n mygrop.imr_ifindex= if_nametoindex("ens33");\/\/\u7f51\u5361
\n ret = setsockopt(sfd, IPPROTO_IP, IP_ADD_MEMBERSHIP,&mygrop,sizeof(mygrop));<\/p>\n

if(ret< 0)
\n {
\n perror("setsockopt");
\n return -1;
\n }<\/p>\n

while(1)
\n {
\n char buf[10]={0};
\n recvfrom(sfd,buf,10,0,(struct sockaddr *)&addr,&len);
\n printf("%s:%s\\\\n",inet_ntoa(addr.sin_addr),buf);
\n }
\n return 0;<\/p>\n

}<\/p>\n

\u73b0\u8c61<\/p>\n

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