Linux CGI 上传程序

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最新推荐文章于 2024-04-26 11:05:39 发布

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本文介绍了一种利用标准输入读取并解析HTTP POST请求体中的文件内容，实现数据上传与数据库恢复的完整流程。通过代码示例，详细阐述了如何获取文件名、特征码、文件内容，并在接收到特定特征码后执行数据库恢复操作。

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define DEAL_BUF_LEN  1024
#define SIGN_CODE_LEN  100
#define FILE_NAME_LEN 64
#define FILE_SAVE_DIR "/tmp"

enum
{
	STATE_START,
	STATE_GET_SIGN_CODE,
	STATE_GET_FILE_NAME,
	STATE_GET_FILE_START,
	STATE_GET_FILE_CONTENT,
	STATE_CHECK_END,
	STATE_END
};
/***************************************************************************
ShowErrorInfo
****************************************************************************/
static void ShowErrorInfo(char * error)
{

	printf("Content-Type:text/html;charset=UTF-8\n\n");
	printf("<center><font color='red'>%s</font></center>" , error );
}

/* 主体从这里开始 */

int main(void)
{
	FILE *fp; /* 文件指针，保存我们要获得的文件 */
	int getState = STATE_START;
	int contentLength;/*标准输入内容长度*/
	int nowReadLen;
	int signCodeLen;
	int tmpLen;
	char *nowReadP;
	char *nowWriteP;
	char dealBuf[DEAL_BUF_LEN];
	char signCode[SIGN_CODE_LEN]; /*存储本次的特征码*/
	char tmpSignCode[SIGN_CODE_LEN];
	char fileName[FILE_NAME_LEN];
	memset(dealBuf,0,DEAL_BUF_LEN);
	memset(signCode,0,SIGN_CODE_LEN);
	memset(fileName,0,FILE_NAME_LEN);
	nowReadLen = 0;
	if((char *)getenv("CONTENT_LENGTH")!=NULL)
	{
		contentLength = atoi((char *)getenv("CONTENT_LENGTH"));
	}
	else
	{
		ShowErrorInfo("没有恢复数据!");
		exit(1);
	}
 
	while(contentLength > 0)
	{
		if(contentLength >= DEAL_BUF_LEN)
		{
			nowReadLen = DEAL_BUF_LEN;
		}
		else
		{
			nowReadLen = contentLength;
		}
		contentLength -= nowReadLen;
		if(fread(dealBuf,sizeof(char),nowReadLen,stdin) != nowReadLen)
		{
			ShowErrorInfo("读取恢复数据失败，请重试！");
			exit(1);
		}
		nowReadP = dealBuf;
		while(nowReadLen > 0)
		{
			switch (getState)
			{
				case STATE_START:
					nowWriteP = signCode;
					getState = STATE_GET_SIGN_CODE;
				case STATE_GET_SIGN_CODE:
					if(strncmp(nowReadP,"\r\n",2) == 0)
					{
						signCodeLen = nowWriteP - signCode;
						nowReadP++;
						nowReadLen--;
						*nowWriteP = 0;
						getState = STATE_GET_FILE_NAME;
						//ShowErrorInfo(signCode);
					}
					else
					{
						*nowWriteP = *nowReadP;
						nowWriteP++;
					}
					break;
				case STATE_GET_FILE_NAME:
					if(strncmp(nowReadP,"filename=",strlen("filename=")) == 0)
					{
						nowReadP += strlen("filename=");
						nowReadLen -= strlen("filename=");
						nowWriteP = fileName + strlen(FILE_SAVE_DIR);
						while(*nowReadP != '\r')
						{
							if(*nowReadP == '\\' || *nowReadP == '/')
							{
								nowWriteP = fileName + strlen(FILE_SAVE_DIR);
							}
							else if(*nowReadP != '\"')
							{
								*nowWriteP = *nowReadP;
								nowWriteP++;
							}
							nowReadP++;
							nowReadLen--;
						}
						*nowWriteP = 0;
						nowReadP++;
						nowReadLen--;
						getState = STATE_GET_FILE_START;
						memcpy(fileName,FILE_SAVE_DIR,strlen(FILE_SAVE_DIR));
						if((fp=fopen(fileName,"w"))==NULL)
						{
							fprintf(stderr,"open file error\n");
							exit(1);
						}
						//ShowErrorInfo(fileName);
					}
					break;
				case STATE_GET_FILE_START:
					if(strncmp(nowReadP,"\r\n\r\n",4) == 0)
					{
						nowReadP += 3;
						nowReadLen -= 3;
						getState = STATE_GET_FILE_CONTENT;
						//ShowErrorInfo("get");
					}
					break;
				case STATE_GET_FILE_CONTENT:
					if(*nowReadP != '\r')
					{
						fputc(*nowReadP,fp);
					}
					else
					{
						if(nowReadLen >= (signCodeLen + 2))
						{
							if(strncmp(nowReadP + 2,signCode,signCodeLen) == 0)
							{
								getState = STATE_END;
								nowReadLen = 1;
								ShowErrorInfo("数据上传成功");
								/*	if( system( "/var/landog/app/sniff/db_recover.sh" ) == 0 ){
										ShowErrorInfo( "数据库恢复完成，请重新启动landog" );	
									}else{
										ShowErrorInfo( "数据库恢复过程中出现错误，错误原因：恢复的文件已经损坏" );
									}
								*/
							}
							else
							{
								fputc(*nowReadP,fp);
							}
						}
						else
						{
							getState = STATE_CHECK_END;
							nowWriteP = tmpSignCode;
							*nowWriteP = *nowReadP;
							nowWriteP++;
							tmpLen = 1;
						}
					}
					break;
				case STATE_CHECK_END:
					if(*nowReadP != '\r')
					{
						if(tmpLen < signCodeLen + 2)
						{
							*nowWriteP = *nowReadP;
							nowWriteP++;
							tmpLen++;
							if(tmpLen == signCodeLen + 2)
							{
								*nowWriteP = 0;
								if((tmpSignCode[1] == '\n')&&(strncmp(tmpSignCode + 2,signCode,signCodeLen) == 0))
								{
									getState = STATE_END;
									nowReadLen = 1;
									ShowErrorInfo("数据上传成功");
									if( system( "/var/landog/app/sniff/db_recover.sh" ) == 0 ){
										ShowErrorInfo( "数据库恢复完成，请重新启动landog" );	
									}else{
										ShowErrorInfo( "数据库恢复过程中出现错误，错误原因：恢复的文件已经损坏" );
									}
									
								}
								else
								{
									//fprintf(fp,tmpSignCode);
									fwrite(tmpSignCode,sizeof(char),tmpLen,fp);
									getState = STATE_GET_FILE_CONTENT;
								}
							}
						}
					}
					else
					{
						*nowWriteP = 0;
						//fprintf(fp,tmpSignCode);
						fwrite(tmpSignCode,sizeof(char),tmpLen,fp);
						nowWriteP = tmpSignCode;
						*nowWriteP = *nowReadP;
						nowWriteP++;
						tmpLen = 1;
					}
					break;
				case STATE_END:
					nowReadLen = 1;
					break;
					default:break;
			}
			nowReadLen--;
			nowReadP++;
		}
	}
	if(fp != NULL)
	{
		fclose(fp);
	}
	return 0;
}