{"id":26507,"date":"2025-04-19T15:51:30","date_gmt":"2025-04-19T07:51:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/26507.html"},"modified":"2025-04-19T15:51:30","modified_gmt":"2025-04-19T07:51:30","slug":"%ef%bc%88c%e8%af%ad%e8%a8%80%ef%bc%89%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e4%b9%8budp%e8%ae%a4%e8%af%86%e4%b8%8e%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/26507.html","title":{"rendered":"\uff08c\u8bed\u8a00\uff09\u7f51\u7edc\u7f16\u7a0b\u4e4bUDP\u8ba4\u8bc6\u4e0e\u5e76\u53d1\u670d\u52a1\u5668\u5b9e\u73b0"},"content":{"rendered":"

\u4e00\u3001\u6982\u8ff0<\/h2>\n

UDP(User Datagram Protocol) : \u7528\u6237\u6570\u636e\u62a5\u534f\u8bae，\u662f\u4e0d\u53ef\u9760\u7684\u65e0\u8fde\u63a5\u7684\u534f\u8bae\u3002\u5728\u6570\u636e\u53d1\u9001\u524d，\u56e0\u4e3a\u4e0d\u9700\u8981\u8fdb\u884c\u8fde\u63a5，\u6240\u4ee5\u53ef\u7528\u4e8e\u8fdb\u884c\u9ad8\u6548\u7387\u7684\u4f20\u8f93\u3002 \u4f46\u4e0d\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u6027\u3002<\/p>\n

\u7279\u70b9 UDP \u662f\u65e0\u8fde\u63a5\u7684\u534f\u8bae UDP \u4e0d\u4fdd\u8bc1\u6570\u636e\u53ef\u9760\u6027 UDP \u662f\u9762\u5411\u62a5\u6587\u7684 UDP\u901a\u4fe1\u7684\u5b9e\u65f6\u6027\u8f83\u9ad8<\/p>\n

\u7f3a\u70b9：\u6ca1\u6709\u6d41\u63a7\u5236，\u6ca1\u6709\u5e94\u7b54\u786e\u8ba4\u673a\u5236，\u4e0d\u80fd\u89e3\u51b3\u4e22\u5305\u3001\u91cd\u53d1\u3001\u9519\u5e8f\u95ee\u9898\u3002<\/p>\n

\u4f7f\u7528\u573a\u666f \u9002\u5408\u4e8e\u5e7f\u64ad\/\u7ec4\u64ad\u5f0f\u901a\u4fe1\u4e2d\u3002 MSN\/QQ\/Skype\u7b49\u5373\u65f6\u901a\u8baf\u8f6f\u4ef6\u7684\u70b9\u5bf9\u70b9\u6587\u672c\u901a\u8baf\u4ee5\u53ca\u97f3\u89c6\u9891\u901a\u8baf\u901a\u5e38\u91c7\u7528UDP\u534f\u8bae \u6d41\u5a92\u4f53\u3001VOD\u3001VoIP\u3001IPTV\u7b49\u7f51\u7edc\u591a\u5a92\u4f53\u670d\u52a1\u4e2d\u901a\u5e38\u91c7\u7528UDP\u65b9\u5f0f\u8fdb\u884c\u5b9e\u65f6\u6570\u636e\u4f20\u8f93<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u4e8c\u3001UDP\u534f\u8bae\u62a5\u6587<\/h2>\n

\u7528\u6237\u6570\u636e\u62a5\u7531\u4e24\u4e2a\u90e8\u5206\u7ec4\u6210：\u9996\u90e8 + \u6570\u636e\u90e8\u5206\u3002\u9996\u90e8\u90e8\u5206\u5f88\u7b80\u5355，\u53ea\u6709 8 \u4e2a\u5b57\u8282，\u7531\u56db\u4e2a\u5b57\u6bb5\u7ec4\u6210，\u6bcf\u4e2a\u5b57\u6bb5\u7684\u957f\u5ea6\u90fd\u662f\u4e24\u4e2a\u5b57\u8282\u3002<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u6e90\u7aef\u53e3\u53f7： \u6e90\u7aef\u53e3\u53f7，\u9700\u8981\u5bf9\u65b9\u56de\u4fe1\u65f6\u9009\u7528，\u4e0d\u9700\u8981\u65f6\u5168\u90e8\u7f6e0. \u76ee\u7684\u7aef\u53e3\u53f7：\u76ee\u7684\u7aef\u53e3\u53f7，\u5728\u7ec8\u70b9\u4ea4\u4ed8\u62a5\u6587\u7684\u65f6\u5019\u9700\u8981\u7528\u5230\u3002 \u957f\u5ea6：UDP\u7684\u6570\u636e\u62a5\u7684\u957f\u5ea6（\u5305\u62ec\u9996\u90e8\u548c\u6570\u636e）\u5176\u6700\u5c0f\u503c\u4e3a8（\u53ea\u6709\u9996\u90e8） \u6821\u9a8c\u548c：\u68c0\u6d4bUDP\u6570\u636e\u62a5\u5728\u4f20\u8f93\u4e2d\u662f\u5426\u6709\u9519，\u6709\u9519\u5219\u4e22\u5f03<\/p>\n

UDP\u548cTCP\u534f\u8bae\u5bf9\u6bd4 \u7279\u70b9： tcp\u534f\u8bae\u662f\u9762\u5411\u8fde\u63a5\u3001\u53ef\u9760\u3001\u57fa\u4e8e\u5b57\u8282\u6d41 udp\u534f\u8bae\u662f\u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u3001\u57fa\u4e8e\u6570\u636e\u62a5\u6587<\/p>\n

\u6027\u80fd： tcp\u534f\u8bae\u4f20\u8f93\u6548\u7387\u6162，\u6240\u9700\u8981\u8d44\u6e90\u591a udp\u534f\u8bae\u4f20\u8f93\u6548\u7387\u5feb，\u6240\u9700\u8981\u8d44\u6e90\u5c11<\/p>\n

\u5e94\u7528\u5e38\u7528： tcp\u534f\u8bae\u5e38\u7528\u4e8e\u6587\u4ef6，\u90ae\u4ef6\u4f20\u8f93 udp\u534f\u8bae\u5e38\u7528\u4e8e\u8bed\u97f3，\u89c6\u9891，\u76f4\u64ad\u7b49\u5b9e\u65f6\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u6240<\/p>\n

\u4e09\u3001C\u8bed\u8a00\u4e2dUDP\u5b9e\u73b0<\/h2>\n

\u5e38\u89c1\u670d\u52a1\u5668\u7c7b\u578b： \u5904\u7406\u591a\u5ba2\u6237\u7aef\u7684\u901a\u8baf\u5904\u7406\u65b9\u5f0f\u4e0d\u540c，\u5c31\u5bfc\u81f4\u670d\u52a1\u5668\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\u7c7b\u578b<\/p>\n

  • \u8fed\u4ee3\u670d\u52a1\u5668 \u5927\u591a\u6570UDP\u90fd\u662f\u8fed\u4ee3\u8fd0\u884c，\u670d\u52a1\u5668\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u6570\u636e，\u6536\u5230\u6570\u636e\u540e\u5904\u7406\u8be5\u6570\u636e，\u9001\u56de\u5176\u5e94\u7b54，\u5728\u7b49\u5f85\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42\u3002<\/li>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

  • \u5e76\u53d1\u670d\u52a1\u5668 \u5e76\u53d1\u670d\u52a1\u5668\u662f\u6307\u5728\u540c\u4e00\u4e2a\u65f6\u523b\u53ef\u4ee5\u54cd\u5e94\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42 \u672c\u8d28\u662f\u521b\u5efa \u591a\u8fdb\u7a0b\/\u591a\u7ebf\u7a0b ，\u5bf9\u591a\u6570\u7528\u6237\u7684\u4fe1\u606f\u8fdb\u884c\u5904\u7406 UDP\u534f\u8bae\u4e00\u822c\u9ed8\u8ba4\u662f\u4e0d\u652f\u6301\u591a\u7ebf\u7a0b\u5e76\u53d1\u7684 ，\u56e0\u4e3a\u9ed8\u8ba4UDP\u670d\u52a1\u5668\u53ea\u6709\u4e00\u4e2asockfd，\u6240\u6709\u7684\u5ba2\u6237\u7aef\u90fd\u662f\u901a\u8fc7\u540c\u4e00\u4e2asockfd\u8fdb\u884c\u901a\u4fe1\u7684\u3002udp\u4f7f\u7528\u4e00\u4e2asocket，\u5982\u4f55\u505a\u5230\u505a\u5e76\u53d1\u5462？（\u5b50\u8fdb\u7a0b\/\u5b50\u7ebf\u7a0b\u4e2d\u91cd\u65b0\u521b\u5efa）<\/li>\n

    （\u4e00）\u3001UDP\u5e76\u53d1\u670d\u52a1\u5668\u4e4b\u591a\u8fdb\u7a0b\u5e76\u53d1<\/h3>\n
  • \n

    \u573a\u666f\u8bbe\u8ba1 \u591a\u4e2audp\u5ba2\u6237\u7aef\u9700\u8981\u5148\u9a8c\u8bc1\u5bc6\u94a5\u662f\u5426\u6b63\u786e\u540e，\u624d\u5141\u8bb8\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\u3002\u5047\u8bbe\u5bc6\u94a5\u4e3a"root"\u3002（\u7c7b\u4f3c\u4e8e\u767b\u5f55\u529f\u80fd） \u670d\u52a1\u5668\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u4fe1\u606f，\u9700\u8981\u8003\u8651\u4e24\u79cd\u60c5\u51b5 <1>A\u7528\u6237\u7684\u5bc6\u94a5\u9a8c\u8bc1\u8bf7\u6c42\u6d88\u606f <2>B\u7528\u6237\u7684\u6570\u636e\u4ea4\u4e92\u63a5\u6536\u6d88\u606f<\/p>\n<\/li>\n

  • \n

    \u6846\u67b6\u56fe \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n<\/li>\n

  • \n

    \u4f7f\u7528\u573a\u666f \u5f53UDP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u4ea4\u4e92\u591a\u4e2a\u6570\u636e\u62a5\u3002\u95ee\u9898\u5728\u4e8e\u6bcf\u4e2a\u5ba2\u6237\u90fd\u662f\u5f80\u670d\u52a1\u5668\u7aef\u7684\u540c\u4e00\u4e2a\u7684\u7aef\u53e3\u53d1\u9001\u6570\u636e，\u5e76\u7528\u7684\u540c\u4e00\u4e2asockfd\u3002\u5e76\u53d1\u670d\u52a1\u5668\u7684\u6bcf\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u5982\u4f55\u6b63\u786e\u533a\u5206\u6bcf\u4e00\u4e2a\u5ba2\u6237\u7684\u6570\u636e\u62a5（\u6d89\u53ca\u5230\u8fdb\u7a0b\u7684\u8c03\u5ea6\u95ee\u9898，\u5982\u4f55\u907f\u514d\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u8bfb\u53d6\u5230\u4e0d\u8be5\u5b83\u670d\u52a1\u7684\u5ba2\u6237\u53d1\u9001\u6765\u7684\u6570\u636e\u62a5）\u3002 \u89e3\u51b3\u7684\u65b9\u6cd5\u662f\u670d\u52a1\u5668（\u77e5\u540d\u7aef\u53e3）\u7b49\u5f85\u5ba2\u6237\u7684\u5230\u6765，\u5f53\u4e00\u4e2a\u5ba2\u6237\u5230\u6765\u540e，\u8bb0\u4e0b\u5176IP\u548cport，\u7136\u540e\u670d\u52a1\u5668fork\u4e00\u4e2a\u5b50\u8fdb\u7a0b，\u5efa\u7acb\u4e00\u4e2asocket\u518dbind\u4e00\u4e2a\u968f\u673a\u7aef\u53e3，\u7136\u540e\u5efa\u7acb\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5，\u5e76\u5904\u7406\u8be5\u5ba2\u6237\u7684\u8bf7\u6c42\u3002\u7236\u8fdb\u7a0b\u7ee7\u7eed\u5faa\u73af，\u7b49\u5f85\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7684\u5230\u6765\u3002 \u5728tftpd\u4e2d\u5c31\u662f\u4f7f\u7528\u8fd9\u79cd\u6280\u672f\u7684 \u3002<\/p>\n<\/li>\n

    \u4ee3\u7801\u5b9e\u73b0<\/p>\n

    UDP\u670d\u52a1\u5668\u4ee3\u7801\u5b9e\u73b0<\/p>\n

    #<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdlib.h><\/span><\/span>
    \n#<\/span>include<\/span> <string.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/types.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/wait.h><\/span><\/span>
    \n#<\/span>include<\/span> <signal.h><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_KEY<\/span> "root"<\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_SUCCESS<\/span> 1<\/span><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_FAILURE<\/span> 0<\/span><\/span><\/span>
    \nint<\/span> init_socket<\/span>(<\/span>const<\/span> char<\/span>*<\/span> ip,<\/span>const<\/span> char<\/span>*<\/span> port)<\/span>
    \n{<\/span>
    \n\/\/ \u521b\u5efasocket<\/span>
    \nint<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span>SOCK_DGRAM,<\/span>0<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"socket"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u7ed1\u5b9aIP + \u7aef\u53e3<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nmemset<\/span>(<\/span>&<\/span>addr,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span>;<\/span>
    \naddr.<\/span>sin_family =<\/span>AF_INET;<\/span>
    \naddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>atoi<\/span>(<\/span>port)<\/span>)<\/span>;<\/span>
    \ninet_aton<\/span>(<\/span>ip,<\/span>&<\/span>(<\/span>addr.<\/span>sin_addr)<\/span>)<\/span>;<\/span>
    \nint<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>bind<\/span>(<\/span>sockfd,<\/span>(<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>addrlen)<\/span>==<\/span>–<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nfprintf<\/span>(<\/span>stderr<\/span>,<\/span>"bind failed\\\\n"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nreturn<\/span> sockfd;<\/span>
    \n}<\/span>
    \nint<\/span> authentication_key<\/span>(<\/span>const<\/span> char<\/span>*<\/span> ip,<\/span>const<\/span> char<\/span>*<\/span> port)<\/span>
    \n{<\/span>
    \nint<\/span> sockfd =<\/span> init_socket<\/span>(<\/span>ip,<\/span>port)<\/span>;<\/span>
    \nif<\/span>(<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nint<\/span> len =<\/span> sizeof<\/span>(<\/span>buf)<\/span>;<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nint<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>addr)<\/span>;<\/span>
    \nint<\/span> new_sockfd;<\/span>
    \n\/\/ \u5faa\u73af\u9a8c\u8bc1\u7528\u6237\u5bc6\u94a5<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n{<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>len)<\/span>;<\/span>
    \nssize_t<\/span> recvbytes =<\/span> recvfrom<\/span>(<\/span>sockfd,<\/span>buf,<\/span>len,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>&<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>recvbytes ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"redvfrom"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nunsigned<\/span> char<\/span> loginstatus =<\/span> (<\/span>strncmp<\/span>(<\/span>buf,<\/span>LOGIN_KEY,<\/span>4<\/span>)<\/span>==<\/span>0<\/span>)<\/span>?<\/span>
    \nLOGIN_SUCCESS:<\/span>LOGIN_FAILURE;<\/span>
    \nif<\/span>(<\/span>loginstatus ==<\/span> LOGIN_SUCCESS)<\/span>
    \n {<\/span>
    \npid_t<\/span> pid =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>pid ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"fork"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nelse<\/span> if<\/span>(<\/span>pid ==<\/span> 0<\/span>)<\/span>
    \n {<\/span>
    \n\/\/ \u6267\u884c\u7684\u662f\u5b50\u8fdb\u7a0b<\/span>
    \nclose<\/span>(<\/span>sockfd)<\/span>;<\/span>\/\/\u5bc6\u94a5\u9a8c\u8bc1\u6210\u529f，\u4e0d\u9700\u8981sockfd\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
    \nnew_sockfd =<\/span> init_socket<\/span>(<\/span>ip,<\/span>"0"<\/span>)<\/span>;<\/span>\/\/ \u7ed1\u5b9a0\u7aef\u53e3，\u7cfb\u7edf\u4f1a\u968f\u673a\u5206\u914d\u4e00\u4e2a\u53ef\u7528\u7684\u7aef\u53e3\u53f7<\/span>
    \nsendto<\/span>(<\/span>new_sockfd,<\/span>&<\/span>loginstatus,<\/span>sizeof<\/span>(<\/span>loginstatus)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>addrlen)<\/span>;<\/span>
    \nbreak<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \nelse<\/span>
    \n {<\/span>
    \n\/\/ \u767b\u5f55\u5931\u8d25，\u4f7f\u7528\u539f\u7aef\u53e3\u56de\u590d\u4fe1\u606f<\/span>
    \nssize_t<\/span> ret =<\/span>
    \nsendto<\/span>(<\/span>sockfd,<\/span>&<\/span>loginstatus,<\/span>sizeof<\/span>(<\/span>loginstatus)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>addrlen)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \nreturn<\/span> new_sockfd;<\/span>
    \n}<\/span>
    \n\/\/ \u63a5\u6536\u6570\u636e<\/span>
    \nvoid<\/span> recv_data<\/span>(<\/span>int<\/span> sockfd)<\/span>
    \n{<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nstruct<\/span> sockaddr_in<\/span> client_addr;<\/span>
    \nsocklen_t<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>client_addr)<\/span>;<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span>
    \nssize_t<\/span> recvbytes =<\/span> recvfrom<\/span>(<\/span>sockfd,<\/span>buf,<\/span>sizeof<\/span>(<\/span>buf)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>client_addr,<\/span>&<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>recvbytes==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"recvfrom"<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \nprintf<\/span>(<\/span>"client ip:%s\\\\n"<\/span>,<\/span>inet_ntoa<\/span>(<\/span>client_addr.<\/span>sin_addr)<\/span>)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"client port:%d\\\\n"<\/span>,<\/span>ntohs<\/span>(<\/span>client_addr.<\/span>sin_port)<\/span>)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"client content:%s\\\\n"<\/span>,<\/span>buf)<\/span>;<\/span>
    \nif<\/span>(<\/span>strncmp<\/span>(<\/span>buf,<\/span>"quit"<\/span>,<\/span>4<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
    \n {<\/span>
    \nbreak<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \nclose<\/span>(<\/span>sockfd)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_SUCCESS)<\/span>;<\/span>
    \n}<\/span>
    \nvoid<\/span> signal_handler<\/span>(<\/span>int<\/span> signum)<\/span>
    \n{<\/span>
    \n\/\/ \u56de\u6536\u5b50\u8fdb\u7a0b\u7684\u8d44\u6e90<\/span>
    \nwaitpid<\/span>(<\/span>–<\/span>1<\/span>,<\/span>NULL<\/span>,<\/span>WNOHANG)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"%s\\\\n"<\/span>,<\/span>strsignal<\/span>(<\/span>signum)<\/span>)<\/span>;<\/span>
    \n}<\/span>
    \nint<\/span> main<\/span>(<\/span>int<\/span> argc,<\/span>char<\/span>*<\/span> argv[<\/span>]<\/span>)<\/span>
    \n{<\/span>
    \nif<\/span>(<\/span>argc !=<\/span>3<\/span>)<\/span>
    \n {<\/span>
    \nfprintf<\/span>(<\/span>stderr<\/span>,<\/span>"%s ip port.\\\\n"<\/span>,<\/span>argv[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u56de\u6536\u50f5\u5c38\u6001\u7684\u5b50\u8fdb\u7a0b[\u5b50\u8fdb\u7a0b\u7ed3\u675f\u540e，\u4f1a\u53d1SIGCHLD\u4fe1\u53f7]<\/span>
    \nif<\/span>(<\/span>signal<\/span>(<\/span>SIGCHLD,<\/span>signal_handler)<\/span>==<\/span>SIG_ERR)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"signal error."<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u9a8c\u8bc1\u79d8\u94a5<\/span>
    \nint<\/span> sockfd =<\/span> authentication_key<\/span>(<\/span>argv[<\/span>1<\/span>]<\/span>,<\/span>argv[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
    \n\/\/ recv data<\/span>
    \nrecv_data<\/span>(<\/span>sockfd)<\/span>;<\/span>
    \nreturn<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    UDP\u5ba2\u6237\u7aef\u4ee3\u7801\u5b9e\u73b0<\/p>\n

    #<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdlib.h><\/span><\/span>
    \n#<\/span>include<\/span> <string.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/types.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_SUCCESS<\/span> 1<\/span><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_FAILURE<\/span> 0<\/span><\/span><\/span>
    \n\/\/ \u53d1\u9001\u4ea4\u4e92\u6d88\u606f<\/span>
    \nvoid<\/span> send_message<\/span>(<\/span>int<\/span> sockfd,<\/span>struct<\/span> sockaddr_in<\/span>*<\/span> addr,<\/span>int<\/span> addrlen)<\/span>
    \n{<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"client:"<\/span>)<\/span>;<\/span>
    \nfgets<\/span>(<\/span>buf,<\/span>sizeof<\/span>(<\/span>buf)<\/span>,<\/span>stdin<\/span>)<\/span>;<\/span>
    \nbuf[<\/span>strlen<\/span>(<\/span>buf)<\/span>–<\/span>1<\/span>]<\/span>=<\/span>'\\\\0'<\/span>;<\/span>
    \nint<\/span> ret =<\/span> sendto<\/span>(<\/span>sockfd,<\/span>buf,<\/span>strlen<\/span>(<\/span>buf)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>addr,<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>ret ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"client sendto"<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \nif<\/span>(<\/span>strncmp<\/span>(<\/span>buf,<\/span>"quit"<\/span>,<\/span>4<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
    \n {<\/span>
    \nbreak<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span>
    \nvoid<\/span> send_authentication_key<\/span>(<\/span>int<\/span> sockfd,<\/span>struct<\/span> sockaddr_in<\/span>*<\/span> addr,<\/span>struct<\/span>
    \nsockaddr_in<\/span>*<\/span> server_data_addr,<\/span>int<\/span> addrlen)<\/span>
    \n{<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nunsigned<\/span> char<\/span> flag =<\/span> LOGIN_FAILURE;<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nputchar<\/span>(<\/span>'>'<\/span>)<\/span>;<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span>
    \nfgets<\/span>(<\/span>buf,<\/span>sizeof<\/span>(<\/span>buf)<\/span>,<\/span>stdin<\/span>)<\/span>;<\/span> \/\/\u63a5\u6536\u7528\u6237\u7684\u8f93\u5165<\/span>
    \nbuf[<\/span>strlen<\/span>(<\/span>buf)<\/span>–<\/span>1<\/span>]<\/span>=<\/span>'\\\\0'<\/span>;<\/span>
    \nint<\/span> ret =<\/span> sendto<\/span>(<\/span>sockfd,<\/span>buf,<\/span>strlen<\/span>(<\/span>buf)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>addr,<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>ret ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"client sendto"<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n}<\/span>
    \n\/\/ \u63a5\u6536\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6d88\u606f<\/span>
    \nssize_t<\/span> recvbytes =<\/span> recvfrom<\/span>(<\/span>sockfd,<\/span>&<\/span>flag,<\/span>sizeof<\/span>(<\/span>flag)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>server_data_addr,<\/span>&<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>recvbytes ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"client recvfrom"<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \nif<\/span>(<\/span>flag ==<\/span> LOGIN_SUCCESS)<\/span>
    \n {<\/span>
    \nbreak<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span>
    \nint<\/span> main<\/span>(<\/span>int<\/span> argc,<\/span>char<\/span>*<\/span> argv[<\/span>]<\/span>)<\/span>
    \n{<\/span>
    \nif<\/span>(<\/span>argc !=<\/span>3<\/span>)<\/span>
    \n {<\/span>
    \nfprintf<\/span>(<\/span>stderr<\/span>,<\/span>"%s ip port.\\\\n"<\/span>,<\/span>argv[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u521b\u5efasocket<\/span>
    \nint<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span>SOCK_DGRAM,<\/span>0<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"socket"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u670d\u52a1\u5668\u7aef\u7684\u5730\u5740<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nmemset<\/span>(<\/span>&<\/span>addr,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span>;<\/span>
    \naddr.<\/span>sin_family =<\/span>AF_INET;<\/span>
    \naddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>atoi<\/span>(<\/span>argv[<\/span>2<\/span>]<\/span>)<\/span>)<\/span>;<\/span>
    \ninet_aton<\/span>(<\/span>argv[<\/span>1<\/span>]<\/span>,<\/span>&<\/span>(<\/span>addr.<\/span>sin_addr)<\/span>)<\/span>;<\/span>
    \nint<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>;<\/span>
    \n\/\/ \u5904\u7406\u6570\u636e\u7684\u670d\u52a1\u7aef\u4fe1\u606f<\/span>
    \nstruct<\/span> sockaddr_in<\/span> server_data_addr;<\/span>
    \nmemset<\/span>(<\/span>&<\/span>server_data_addr,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span>;<\/span>
    \nserver_data_addr.<\/span>sin_family =<\/span>AF_INET;<\/span>
    \n\/\/ \u53d1\u9001\u5bc6\u94a5\u4fe1\u606f<\/span>
    \nsend_authentication_key<\/span>(<\/span>sockfd,<\/span>&<\/span>addr,<\/span>&<\/span>server_data_addr,<\/span>addrlen)<\/span>;<\/span>
    \n\/\/ \u53d1\u9001\u4ea4\u4e92\u6d88\u606f<\/span>
    \nsend_message<\/span>(<\/span>sockfd,<\/span>&<\/span>server_data_addr,<\/span>addrlen)<\/span>;<\/span>
    \n\/\/\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
    \nclose<\/span>(<\/span>sockfd)<\/span>;<\/span>
    \nreturn<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    （\u4e8c）\u3001UDP\u5e76\u53d1\u670d\u52a1\u5668\u4e4b\u591a\u7ebf\u7a0b\u5e76\u53d1<\/h3>\n

    \u591a\u7ebf\u7a0b\u5e76\u53d1\u670d\u52a1\u5668\u548c\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668\u7684\u601d\u8def\u5927\u540c\u5c0f\u5f02，\u90fd\u662f\u670d\u52a1\u5668\u7aef\u7b49\u5f85\u5ba2\u6237\u7aef，\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u5230\u6765\u540e，\u8bb0\u5f55\u5176IP\u548cport，\u7136\u540e\u540c\u7406，\u521b\u5efa\u5b50\u7ebf\u7a0b，\u5efa\u7acb\u4e00\u4e2asocket\u518dbind\u4e00\u4e2a\u968f\u673a\u7aef\u53e3，\u7136\u540e\u5efa\u7acb\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5，\u5e76\u5904\u7406\u8be5\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002\u7236\u7ebf\u7a0b\u7ee7\u7eed\u5faa\u73af，\u7b49\u5f85\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u5230\u6765\u3002 \u4e00\u4e2a\u8fdb\u7a0b\u662f\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u7aef\u53e3\u3002<\/p>\n

  • \u6846\u67b6\u56fe \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/li>\n
  • \u4ee3\u7801\u5b9e\u73b0 \u670d\u52a1\u7aef\u4ee3\u7801：<\/li>\n

    #<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdlib.h><\/span><\/span>
    \n#<\/span>include<\/span> <string.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/types.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <netinet\/in.h><\/span><\/span>
    \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <pthread.h><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_KEY<\/span> "root"<\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_SUCCESS<\/span> 1<\/span><\/span><\/span>
    \n#<\/span>define<\/span> LOGIN_FAILURE<\/span> 0<\/span><\/span><\/span>
    \ntypedef<\/span> struct<\/span>{<\/span>
    \nchar<\/span> ip[<\/span>256<\/span>]<\/span>;<\/span>\/\/ ip<\/span>
    \nunsigned<\/span> char<\/span> flag;<\/span> \/\/ \u767b\u5f55\u6807\u8bc6<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>\/\/ \u6570\u636e\u4ea4\u4e92\u7684\u5730\u5740<\/span>
    \n}<\/span>packet_t<\/span>;<\/span>
    \nint<\/span> init_socket<\/span>(<\/span>const<\/span> char<\/span>*<\/span> ip,<\/span>const<\/span> char<\/span>*<\/span> port)<\/span>
    \n{<\/span>
    \n\/\/ \u521b\u5efasocket<\/span>
    \nint<\/span> sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span>SOCK_DGRAM,<\/span>0<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"socket"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u7ed1\u5b9aIP + \u7aef\u53e3<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nmemset<\/span>(<\/span>&<\/span>addr,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>)<\/span>;<\/span>
    \naddr.<\/span>sin_family =<\/span>AF_INET;<\/span>
    \naddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>atoi<\/span>(<\/span>port)<\/span>)<\/span>;<\/span>
    \ninet_aton<\/span>(<\/span>ip,<\/span>&<\/span>(<\/span>addr.<\/span>sin_addr)<\/span>)<\/span>;<\/span>
    \nint<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>struct<\/span> sockaddr_in<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>bind<\/span>(<\/span>sockfd,<\/span>(<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>addrlen)<\/span>==<\/span>–<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nfprintf<\/span>(<\/span>stderr<\/span>,<\/span>"bind failed\\\\n"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nreturn<\/span> sockfd;<\/span>
    \n}<\/span>
    \nvoid<\/span>*<\/span> message_handle<\/span>(<\/span>void<\/span>*<\/span> argv)<\/span>
    \n{<\/span>
    \nvoid<\/span> recv_data<\/span>(<\/span>int<\/span> sockfd)<\/span>;<\/span>
    \n\/\/ \u63a5\u6536\u53c2\u6570<\/span>
    \npacket_t<\/span>*<\/span> packet =<\/span> (<\/span>packet_t<\/span>*<\/span>)<\/span>argv;<\/span>
    \n\/\/\u521b\u5efa\u65b0\u7684socket<\/span>
    \nint<\/span> new_sockfd =<\/span> init_socket<\/span>(<\/span>packet-><\/span>ip,<\/span>"0"<\/span>)<\/span>;<\/span>
    \nif<\/span>(<\/span>new_sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"init_socket"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> NULL<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u7ed9\u5ba2\u6237\u7aef\u54cd\u5e94\u767b\u5f55\u6210\u529f<\/span>
    \nsendto<\/span>(<\/span>new_sockfd,<\/span>&<\/span>(<\/span>packet-><\/span>flag)<\/span>,<\/span>sizeof<\/span>(<\/span>packet-><\/span>flag)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>(<\/span>packet-><\/span>addr)<\/span>,<\/span>sizeof<\/span>(<\/span>struct<\/span> sockaddr<\/span>)<\/span>)<\/span>;<\/span>
    \n\/\/ \u6570\u636e\u4ea4\u4e92<\/span>
    \nrecv_data<\/span>(<\/span>new_sockfd)<\/span>;<\/span>
    \npthread_exit<\/span>(<\/span>NULL<\/span>)<\/span>;<\/span>
    \n}<\/span>
    \nvoid<\/span> authentication_key<\/span>(<\/span>const<\/span> char<\/span>*<\/span> ip,<\/span>const<\/span> char<\/span>*<\/span> port)<\/span>
    \n{<\/span>
    \nint<\/span> sockfd =<\/span> init_socket<\/span>(<\/span>ip,<\/span>port)<\/span>;<\/span>
    \nif<\/span>(<\/span>sockfd ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nint<\/span> len =<\/span> sizeof<\/span>(<\/span>buf)<\/span>;<\/span>
    \nstruct<\/span> sockaddr_in<\/span> addr;<\/span>
    \nint<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>addr)<\/span>;<\/span>
    \nint<\/span> new_sockfd;<\/span>
    \npthread_t<\/span> pid;<\/span>
    \n\/\/ \u5faa\u73af\u9a8c\u8bc1\u7528\u6237\u5bc6\u94a5<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>len)<\/span>;<\/span>
    \nssize_t<\/span> recvbytes =<\/span> recvfrom<\/span>(<\/span>sockfd,<\/span>buf,<\/span>len,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>&<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>recvbytes ==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"redvfrom"<\/span>)<\/span>;<\/span>
    \nreturn<\/span> –<\/span>1<\/span>;<\/span>
    \n }<\/span>
    \nunsigned<\/span> char<\/span> loginstatus =<\/span> (<\/span>strncmp<\/span>(<\/span>buf,<\/span>LOGIN_KEY,<\/span>4<\/span>)<\/span>==<\/span>0<\/span>)<\/span>?<\/span>
    \nLOGIN_SUCCESS:<\/span>LOGIN_FAILURE;<\/span>
    \nif<\/span>(<\/span>loginstatus ==<\/span> LOGIN_SUCCESS)<\/span>
    \n {<\/span>
    \n\/\/ \u521b\u5efa\u5b50\u7ebf\u7a0b<\/span>
    \npacket_t<\/span> packet;<\/span>
    \nstrcpy<\/span>(<\/span>packet.<\/span>ip,<\/span>ip)<\/span>;<\/span>
    \npacket.<\/span>flag =<\/span> loginstatus;<\/span>
    \npacket.<\/span>addr =<\/span> addr;<\/span>
    \npthread_create<\/span>(<\/span>&<\/span>pid,<\/span>NULL<\/span>,<\/span>message_handle,<\/span>&<\/span>packet)<\/span>;<\/span>
    \n\/\/ \u7ebf\u7a0b\u5206\u79bb<\/span>
    \npthread_detach<\/span>(<\/span>pid)<\/span>;<\/span>
    \n }<\/span>
    \nelse<\/span>
    \n {<\/span>
    \n\/\/ \u767b\u5f55\u5931\u8d25，\u4f7f\u7528\u539f\u7aef\u53e3\u56de\u590d\u4fe1\u606f<\/span>
    \nssize_t<\/span> ret =<\/span>
    \nsendto<\/span>(<\/span>sockfd,<\/span>&<\/span>loginstatus,<\/span>sizeof<\/span>(<\/span>loginstatus)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>addr,<\/span>addrlen)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span>
    \n\/\/ \u63a5\u6536\u6570\u636e<\/span>
    \nvoid<\/span> recv_data<\/span>(<\/span>int<\/span> sockfd)<\/span>
    \n{<\/span>
    \nchar<\/span> buf[<\/span>512<\/span>]<\/span>=<\/span>{<\/span>0<\/span>}<\/span>;<\/span>
    \nstruct<\/span> sockaddr_in<\/span> client_addr;<\/span>
    \nsocklen_t<\/span> addrlen =<\/span> sizeof<\/span>(<\/span>client_addr)<\/span>;<\/span>
    \nwhile<\/span>(<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nmemset<\/span>(<\/span>buf,<\/span>0<\/span>,<\/span>sizeof<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span>
    \nssize_t<\/span> recvbytes =<\/span> recvfrom<\/span>(<\/span>sockfd,<\/span>buf,<\/span>sizeof<\/span>(<\/span>buf)<\/span>,<\/span>0<\/span>,<\/span>(<\/span>struct<\/span>
    \nsockaddr<\/span>*<\/span>)<\/span>&<\/span>client_addr,<\/span>&<\/span>addrlen)<\/span>;<\/span>
    \nif<\/span>(<\/span>recvbytes==<\/span> –<\/span>1<\/span>)<\/span>
    \n {<\/span>
    \nperror<\/span>(<\/span>"recvfrom"<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \nprintf<\/span>(<\/span>"client ip:%s\\\\n"<\/span>,<\/span>inet_ntoa<\/span>(<\/span>client_addr.<\/span>sin_addr)<\/span>)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"client port:%d\\\\n"<\/span>,<\/span>ntohs<\/span>(<\/span>client_addr.<\/span>sin_port)<\/span>)<\/span>;<\/span>
    \nprintf<\/span>(<\/span>"client content:%s\\\\n"<\/span>,<\/span>buf)<\/span>;<\/span>
    \nif<\/span>(<\/span>strncmp<\/span>(<\/span>buf,<\/span>"quit"<\/span>,<\/span>4<\/span>)<\/span>==<\/span>0<\/span>)<\/span>
    \n {<\/span>
    \nbreak<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \nclose<\/span>(<\/span>sockfd)<\/span>;<\/span>
    \n}<\/span>
    \nint<\/span> main<\/span>(<\/span>int<\/span> argc,<\/span>char<\/span>*<\/span> argv[<\/span>]<\/span>)<\/span>
    \n{<\/span>
    \nif<\/span>(<\/span>argc !=<\/span>3<\/span>)<\/span>
    \n {<\/span>
    \nfprintf<\/span>(<\/span>stderr<\/span>,<\/span>"%s ip port.\\\\n"<\/span>,<\/span>argv[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
    \nexit<\/span>(<\/span>EXIT_FAILURE)<\/span>;<\/span>
    \n }<\/span>
    \n\/\/ \u9a8c\u8bc1\u79d8\u94a5<\/span>
    \nauthentication_key<\/span>(<\/span>argv[<\/span>1<\/span>]<\/span>,<\/span>argv[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
    \nreturn<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u5ba2\u6237\u7aef\u4ee3\u7801\u4e0e\u8fdb\u7a0b\u90a3\u5757\u4e00\u6837<\/p>\n

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