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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="15.htm">上一层</a>][<a href="555.htm">下一篇</a>]
<hr><p align="left"><small>发信人: cloudsky (小四), 信区: Security ;32mWWW-POSTm <br>
标 题: RPC/XDR/NFS系列之----RPC编程初战(1) <br>
发信站: 武汉白云黄鹤站 (Sun Feb 20 11:40:23 2000) , 站内信件 <br>
标题：RPC/XDR/NFS系列之----RPC编程初战(1) <br>
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原 作：Douglas E. Comer & David L. Stevens <br>
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<< Internetworking With TCP/IP Vol III >> <br>
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整理修改：scz < mailto: cloudsky@263.net > <br>
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概述： <br>
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所有关于原理的部分以后再贴，这里直奔程序设 <br>
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计而去。文章中的程序就是书中的程序，但原文 <br>
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针对Xinu系统来的，要不就针对Sun RPC来的， <br>
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我这里只有Redhat，改动是一定的，在后面的小 <br>
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节里我会指出改动过的地方。完整地演习过这个 <br>
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系列，你就不在畏惧RPC。计划在后面的灌水中 <br>
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讲述RPC远程过程调用发生缓冲区溢出的原理， <br>
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不过仅仅是计划，要看时间是否允许。 <br>
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下面的程序完成一个字典的常规维护工作，代码 <br>
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很简单，让我们开始。 <br>
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测试： <br>
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RedHat6.0测试，如果在solaris下，应该更容易实现， <br>
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因为Sun RPC是事实上的标准，rpcgen是Sun自己的工 <br>
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具嘛。 <br>
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目录： <br>
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★ 构建一个解决问题的常规应用程序 <br>
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★ 将该常规程序划分成两部分 <br>
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★ 创建一个rpcgen规格说明 <br>
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★ 运行rpcgen <br>
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★ rpcgen产生的.h文件 <br>
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★ rpcgen产生的XDR转换文件 <br>
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★ rpcgen产生的client代码 <br>
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★ rpcgen产生的server代码 <br>
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★ 编写stub接口过程 <br>
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★ 编译链接client程序 <br>
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★ 编译链接server程序 <br>
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★ 启动服务器执行客户机 <br>
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★ 分离服务器和客户机 <br>
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★ rpcinfo的使用以及portmap原理简介(重要) <br>
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★ RPC程序编译开关 <br>
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★ RPC编程小结 <br>
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★ 构建一个解决问题的常规应用程序 <br>
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下面这个程序很简单，实现一个字典的简单维护工作，不多解释了。 <br>
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/* dict.c -- main, initw, nextin, insertw, deletew, lookupw */ <br>
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#include <stdlib.h> <br>
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#include <stdio.h> <br>
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#include <ctype.h> <br>
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#include <string.h> <br>
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#define MAXWORD 50 /* maximum length of a command or word */ <br>
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#define DICTSIZ 100 /* maximum number of entries in dictionary. */ <br>
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char dict[ DICTSIZ ][ MAXWORD + 1 ]; /* storage for a dictionary of <br>
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words */ <br>
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int nwords = 0; /* number of words in the <br>
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dictionary */ <br>
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/* 函数原型 */ <br>
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int nextin ( char * cmd, char * word ); <br>
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int initw ( void ); <br>
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int insertw ( const char * word ); <br>
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int deletew ( const char * word ); <br>
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int lookupw ( const char * word ); <br>
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/* ------------------------------------------------------------------ <br>
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* main -- insert, delete, or lookup words in a dictionary as <br>
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specified <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int main ( int argc, char * argv[] ) <br>
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{ <br>
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char word[ MAXWORD + 1 ]; /* space to hold word from input line <br>
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*/ <br>
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char cmd; <br>
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int wordlen; /* length of input word */ <br>
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printf( "Please input:\n" ); <br>
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while ( 1 ) <br>
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{ <br>
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wordlen = nextin( &cmd, word ); <br>
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if ( wordlen < 0 ) <br>
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{ <br>
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exit( 0 ); <br>
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} <br>
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switch ( cmd ) <br>
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{ <br>
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case 'I': /* 初始化 */ <br>
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initw(); <br>
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printf( "Dictionary initialized to empty.\n" ); <br>
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break; <br>
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case 'i': /* 插入 */ <br>
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insertw( word ); <br>
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printf( "%s inserted.\n", word ); <br>
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break; <br>
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case 'd': /* 删除 */ <br>
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if ( deletew( word ) ) <br>
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{ <br>
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printf( "%s deleted.\n", word ); <br>
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} <br>
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else <br>
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{ <br>
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printf( "%s not found.\n", word ); <br>
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} <br>
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break; <br>
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case 'l': /* 查询 */ <br>
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if ( lookupw( word ) ) <br>
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{ <br>
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printf( "%s was found.\n", word ); <br>
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} <br>
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else <br>
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{ <br>
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printf( "%s was not found.\n", word ); <br>
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} <br>
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break; <br>
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case 'q': /* 退出 */ <br>
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printf( "Program quits.\n" ); <br>
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exit( 0 ); <br>
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break; <br>
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default: /* 非法输入 */ <br>
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printf( "command %c invalid.\n", cmd ); <br>
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break; <br>
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} /* end of switch */ <br>
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} /* end of while */ <br>
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return 0; <br>
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} /* end of main */ <br>
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/* ------------------------------------------------------------------ <br>
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* nextin -- read a command and(possibly) a word from the next input <br>
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line <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int nextin ( char * cmd, char * word ) <br>
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{ <br>
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int i, ch; <br>
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ch = getc( stdin ); <br>
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while ( isspace( ch ) ) <br>
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while ( !isspace( ch ) ) <br>
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{ <br>
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if ( ++i > MAXWORD ) <br>
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{ <br>
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printf( "error: word too long.\n" ); <br>
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exit( 1 ); <br>
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} <br>
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*word++ = ch; <br>
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ch = getc( stdin ); <br>
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} /* end of while */ <br>
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*word = '\0'; /* 原来的代码这里有问题 */ <br>
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return i; <br>
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} /* end of nextin */ <br>
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/* ------------------------------------------------------------------ <br>
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* initw -- initialize the dictionary to contain no words at all <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int initw ( void ) <br>
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{ <br>
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nwords = 0; <br>
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return 1; <br>
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} /* end of initw */ <br>
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/* ------------------------------------------------------------------ <br>
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* insertw -- insert a word in the dictionary <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int insertw ( const char * word ) <br>
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{ <br>
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strcpy( dict[nwords], word ); <br>
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nwords++; <br>
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return( nwords ); <br>
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} /* end of insertw */ <br>
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/* ------------------------------------------------------------------ <br>
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* deletew -- delete a word from the dictionary <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int deletew ( const char * word ) <br>
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{ <br>
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int i; <br>
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for ( i = 0; i < nwords; i++ ) <br>
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{ <br>
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if ( strcmp( word, dict[i] ) == 0 ) <br>
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{ <br>
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nwords--; <br>
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strcpy( dict[i], dict[nwords] ); <br>
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return( 1 ); <br>
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} <br>
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} /* end of for */ <br>
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return( 0 ); <br>
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} /* end of deletew */ <br>
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/* ------------------------------------------------------------------ <br>
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* lookupw -- look up a word in the dictionary <br>
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* ------------------------------------------------------------------ <br>
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*/ <br>
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int lookupw ( const char * word ) <br>
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{ <br>
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int i; <br>
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word2 inserted. <br>
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i word3 <br>
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word3 inserted. <br>
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l word2 <br>
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word2 was found. <br>
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d word2 <br>
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word2 deleted. <br>
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l word2 <br>
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word2 was not found. <br>
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qq < -- -- -- 问题同上，请仔细阅读nextin()函数的代码 <br>
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Program quits. <br>
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[scz@ /home/scz/src]> <br>
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现在我们拥有了一个解决的的常规程序，该程序不是分布式的。 <br>
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-- <br>
<br>
;34m※ 来源: 武汉白云黄鹤站 bbs.whnet.edu.cn. [FROM: 202.106.243. <br>
<br>
213] m <br>
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-- <br>
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</small><hr>
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