FastCgi不仅可以用于webserver与PHP的交互，也可用于任何两个应用之间的交互，PHPer用的比较多的应该就是用于两个子系统之间的交互。 比如A系统和B系统分部独立的部署在两台机器上，其之间通信用的比较多的http协议通信，但通过fastcgi协议通信可以更加简洁、高效。 下面将写个的程序模拟webserver与PHP交互： 首先我们看下webserver与fastcgi应用（如PHP）的交互过程：
PHP $_SERVER数组中变量都是webserver通过FCGI_PARAMS传递到PHP的，关于fastcgi协议详情请查看：fastcgi协议 下面的程序主要实现的是： 执行PHP所在机器/opt/data/www/index.php文件： Index.php文件的内容为：
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echo "Hollo World!\n"; echo $_SERVER[‘MY_NAME‘]."\n"; |
其中$_SERVER[‘MY_NAME‘]是我们通过程序传递过来的变量。 程序具体如下(只是简单模拟交互，程序可能不完善)： Fasctcgi.h:
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/** fastcgi.h --** Defines for the FastCGI protocol.*** Copyright (c) 1995-1996 Open Market, Inc.** See the file "LICENSE.TERMS" for information on usage and redistribution* of this file, and for a DISCLAIMER OF ALL WARRANTIES.** $Id: fastcgi.h,v 1.1.1.1 1997/09/16 15:36:32 stanleyg Exp $*/#ifndef _FASTCGI_H#define _FASTCGI_H/** Listening socket file number*/#define FCGI_LISTENSOCK_FILENO 0typedef
struct {unsigned char
version;unsigned char
type;unsigned char
requestIdB1;unsigned char
requestIdB0;unsigned char
contentLengthB1;unsigned char
contentLengthB0;unsigned char
paddingLength;unsigned char
reserved;} FCGI_Header;#define FCGI_MAX_LENGTH 0xffff/** Number of bytes in a FCGI_Header. Future versions of the protocol* will not reduce this number.*/#define FCGI_HEADER_LEN 8/** Value for version component of FCGI_Header*/#define FCGI_VERSION_1 1/** Values for type component of FCGI_Header*/#define FCGI_BEGIN_REQUEST 1#define FCGI_ABORT_REQUEST 2#define FCGI_END_REQUEST 3#define FCGI_PARAMS 4#define FCGI_STDIN 5#define FCGI_STDOUT 6#define FCGI_STDERR 7#define FCGI_DATA 8#define FCGI_GET_VALUES 9#define FCGI_GET_VALUES_RESULT 10#define FCGI_UNKNOWN_TYPE 11#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE)/** Value for requestId component of FCGI_Header*/#define FCGI_NULL_REQUEST_ID 0typedef
struct {unsigned char
roleB1;unsigned char
roleB0;unsigned char
flags;unsigned char
reserved[5];} FCGI_BeginRequestBody;typedef
struct {FCGI_Header header;FCGI_BeginRequestBody body;} FCGI_BeginRequestRecord;/** Mask for flags component of FCGI_BeginRequestBody*/#define FCGI_KEEP_CONN 1/** Values for role component of FCGI_BeginRequestBody*/#define FCGI_RESPONDER 1#define FCGI_AUTHORIZER 2#define FCGI_FILTER 3typedef
struct {unsigned char
appStatusB3;unsigned char
appStatusB2;unsigned char
appStatusB1;unsigned char
appStatusB0;unsigned char
protocolStatus;unsigned char
reserved[3];} FCGI_EndRequestBody;typedef
struct {FCGI_Header header;FCGI_EndRequestBody body;} FCGI_EndRequestRecord;/** Values for protocolStatus component of FCGI_EndRequestBody*/#define FCGI_REQUEST_COMPLETE 0#define FCGI_CANT_MPX_CONN 1#define FCGI_OVERLOADED 2#define FCGI_UNKNOWN_ROLE 3/** Variable names for FCGI_GET_VALUES / FCGI_GET_VALUES_RESULT records*/#define FCGI_MAX_CONNS "FCGI_MAX_CONNS"#define FCGI_MAX_REQS "FCGI_MAX_REQS"#define FCGI_MPXS_CONNS "FCGI_MPXS_CONNS"typedef
struct {unsigned char
type;unsigned char
reserved[7];} FCGI_UnknownTypeBody;typedef
struct {FCGI_Header header;FCGI_UnknownTypeBody body;} FCGI_UnknownTypeRecord;#endif /* _FASTCGI_H */ |
fastcgi
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#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>#include <netinet/in.h>#include <errno.h>#include "fastcgi.h"typedef
struct sockaddr SA;#define PARAMS_BUFF_LEN 1024#define CONTENT_BUFF_LEN 1024/**----------------------------------------------------------------------** MakeHeader --** Constructs an FCGI_Header struct.**----------------------------------------------------------------------*/static
FCGI_Header MakeHeader(int
type,int
requestId,int
contentLength,int
paddingLength){FCGI_Header header;header.version = FCGI_VERSION_1;header.type = (unsigned char) type;header.requestIdB1 = (unsigned char) ((requestId >> 8) & 0xff);header.requestIdB0 = (unsigned char) ((requestId ) & 0xff);header.contentLengthB1 = (unsigned char) ((contentLength >> 8) & 0xff);header.contentLengthB0 = (unsigned char) ((contentLength ) & 0xff);header.paddingLength = (unsigned char) paddingLength;header.reserved = 0;return
header;}/**----------------------------------------------------------------------** MakeBeginRequestBody --** Constructs an FCGI_BeginRequestBody record.**----------------------------------------------------------------------*/static
FCGI_BeginRequestBody MakeBeginRequestBody(int
role,int
keepConnection){FCGI_BeginRequestBody body;body.roleB1 = (unsigned char) ((role >> 8) & 0xff);body.roleB0 = (unsigned char) (role & 0xff);body.flags = (unsigned char) ((keepConnection) ? FCGI_KEEP_CONN : 0);memset(body.reserved, 0, sizeof(body.reserved));return
body;}static
void FCGI_BuildNameValueBody(char
*name,int
nameLen,char
*value,int
valueLen,unsigned char
*bodyBuffPtr,int
*bodyLenPtr) {unsigned char
*startBodyBuffPtr = bodyBuffPtr;if
(nameLen < 0x80) {*bodyBuffPtr++ = (unsigned char) nameLen;} else
{*bodyBuffPtr++ = (unsigned char) ((nameLen >> 24) | 0x80);*bodyBuffPtr++ = (unsigned char) (nameLen >> 16);*bodyBuffPtr++ = (unsigned char) (nameLen >> 8);*bodyBuffPtr++ = (unsigned char) nameLen;}if
(valueLen < 0x80) {*bodyBuffPtr++ = (unsigned char) valueLen;} else
{*bodyBuffPtr++ = (unsigned char) ((valueLen >> 24) | 0x80);*bodyBuffPtr++ = (unsigned char) (valueLen >> 16);*bodyBuffPtr++ = (unsigned char) (valueLen >> 8);*bodyBuffPtr++ = (unsigned char) valueLen;}while(*name != ‘\0‘){*bodyBuffPtr++ = *name++;}while(*value != ‘\0‘){*bodyBuffPtr++ = *value++;}*bodyLenPtr = bodyBuffPtr - startBodyBuffPtr;}int
main(){int
sockfd,count,requestId=1,result;struct
sockaddr_in serveraddr;if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){perror("socket");}bzero((char
*)&serveraddr, sizeof(serveraddr));serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");serveraddr.sin_port = htons((unsigned short) 9000);result = connect(sockfd ,(SA *)&serveraddr, sizeof(serveraddr));if(result < 0){perror("bind");exit(1);}FCGI_BeginRequestRecord beginRecord;beginRecord.header = MakeHeader(FCGI_BEGIN_REQUEST, requestId,sizeof(beginRecord.body), 0);beginRecord.body = MakeBeginRequestBody(FCGI_RESPONDER, 0);count = write(sockfd, (char
*)&beginRecord, sizeof(beginRecord));if(count != sizeof(beginRecord)) {printf("write error.len:%d,send:%d",sizeof(beginRecord),count);perror("write");exit(1);}//传递SCRIPT_FILENAME参数char
name1[] = "SCRIPT_FILENAME";char
value1[] = "/opt/data/www/index.php";unsigned char
bodyBuff[PARAMS_BUFF_LEN];bzero(bodyBuff,PARAMS_BUFF_LEN);int
nameLen, valueLen, bodyLen;nameLen = strlen(name1);valueLen = strlen(value1);FCGI_BuildNameValueBody(name1,nameLen,value1,valueLen,&bodyBuff[0],&bodyLen);FCGI_Header nameValueHeader;nameValueHeader = MakeHeader(FCGI_PARAMS, requestId,bodyLen, 0);int
valuenameRecordLen = bodyLen+FCGI_HEADER_LEN;char
valuenameRecord[valuenameRecordLen];memcpy(valuenameRecord, (char
*)&nameValueHeader, FCGI_HEADER_LEN);memcpy(valuenameRecord+FCGI_HEADER_LEN, bodyBuff, bodyLen);count = write(sockfd, (char
*)&valuenameRecord, valuenameRecordLen);if(count != valuenameRecordLen) {printf("write aluenameRecord error.len:%d,send:%d",valuenameRecordLen,count);perror("write");exit(1);}//传递MY_NAMEchar
name2[] = "MY_NAME";char
value2[] = "laiwenhui";bzero(bodyBuff,PARAMS_BUFF_LEN);nameLen = strlen(name2);valueLen = strlen(value2);FCGI_BuildNameValueBody(name2,nameLen,value2,valueLen,&bodyBuff[0],&bodyLen);nameValueHeader = MakeHeader(FCGI_PARAMS, requestId,bodyLen, 0);valuenameRecordLen = bodyLen+FCGI_HEADER_LEN;char
myvaluenameRecord[valuenameRecordLen];memcpy(myvaluenameRecord, (char
*)&nameValueHeader, FCGI_HEADER_LEN);memcpy(myvaluenameRecord+FCGI_HEADER_LEN, bodyBuff, bodyLen);count = write(sockfd, (char
*)&myvaluenameRecord, valuenameRecordLen);if(count != valuenameRecordLen) {printf("write aluenameRecord error.len:%d,send:%d",valuenameRecordLen,count);perror("write");exit(1);}//结束请求FCGI_Header endHeader;endHeader = MakeHeader(FCGI_PARAMS, requestId,0, 0);count = write(sockfd, (char
*)&endHeader, FCGI_HEADER_LEN);if(count != FCGI_HEADER_LEN){perror("write");exit(1);}//读取返回头信息FCGI_Header responderHeader;char
content[CONTENT_BUFF_LEN];int
contenLen;char
tmp[8];while(read(sockfd, &responderHeader, FCGI_HEADER_LEN)>0){if(responderHeader.type == FCGI_STDOUT){contenLen = (responderHeader.contentLengthB1<<8)+(responderHeader.contentLengthB0);bzero(content,CONTENT_BUFF_LEN);count = read(sockfd,content,contenLen);if(count != contenLen){perror("read");}fprintf(stdout,"%s",content);//跳过填充部分if(responderHeader.paddingLength>0){count = read(sockfd,tmp,responderHeader.paddingLength);if(count != responderHeader.paddingLength){perror("read");}}}else
if(responderHeader.type == FCGI_STDERR){contenLen = (responderHeader.contentLengthB1<<8)+(responderHeader.contentLengthB0);bzero(content,CONTENT_BUFF_LEN);count = read(sockfd,content,contenLen);if(count != contenLen){perror("read");}fprintf(stdout,"error:%s\n",content);//跳过填充部分if(responderHeader.paddingLength>0){//long int n=lseek(sockfd,responderHeader.paddingLength,SEEK_CUR);count = read(sockfd,tmp,responderHeader.paddingLength);if(count != responderHeader.paddingLength){perror("read");}}}else
if(responderHeader.type == FCGI_END_REQUEST){FCGI_EndRequestBody endRequest;count = read(sockfd,&endRequest,8);if(count != 8){perror("read");}fprintf(stdout,"\nendRequest:appStatus:%d,protocolStatus:%d\n",(endRequest.appStatusB3<<24)+(endRequest.appStatusB2<<16)+(endRequest.appStatusB1<<8)+(endRequest.appStatusB0),endRequest.protocolStatus);}}close(sockfd);return
0;} |
编译：gcc -Wall -g -o fastcgi fastcgi.c ./fastcgi执行结果为：
X-Powered-By: PHP/5.2.14 Content-type: text/html Hollo World! laiwenhui endRequest:appStatus:0,protocolStatus:0
转载自ITCoder
（转）fastcgi协议的简单实现,布布扣,bubuko.com
原文：http://www.cnblogs.com/fengwei/p/3641859.html