boa+cgi上传文件超过1M报错问题

写在前面
今天需要使用页面上传bin包，文件大概是3.9mb，结果一直报错
POST /cgi-bin/Upgrade.cgi undefined
Host: 192.168.137.200:8888
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------279364548015623859994223247018
Content-Length: 4102997
Origin: http://192.168.137.200:8888
Sec-GPC: 1
Connection: keep-alive
Referer: http://192.168.137.200:8888/system-upgrade.html
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache
可以看到是没有定位到cgi的程序，百思不得其解，但是又必须得使用method=“post” enctype=“multipart/form-data”，最后发现boa有文件上传限制，默认是1mb。。。。

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解决方法如下

1. 修改boa.conf配置文件

# SinglePostLimit: The maximum allowable number of bytes in 
# a single POST.  Default is normally 1MB.
SinglePostLimit 16777216 #16MB

这里把它改为16mb

之后使用ps -aux |grep boa kill -9 进程号
重启./boa即可，上传就没有问题了

2. 修改源码

如果是修改boa源码宏定义是修改src文件夹中define.h：

#define SINGLE_POST_LIMIT_DEFAULT 1024 * 1024 * 16 /* 16 MB */

然后重新编译代码即可

贴下cgi代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "cgic.h"#define BufferLen 4096static unsigned char xor_mask[] =
{
46,175,116,168,85,253,15,163,167,87,
121,198,175,136,79,125,156,10,72,135,
208,71,39,164,238,167,42,101,154,14, 
235,225,76,27,106,109,193,208,89,35,
101,37,12,121,241,205,7,227,169,30, 
109,80,203,49,245,169,26,111,218,156,
145,78,186,219,215,80,28,186,60,191,
33,23,109,144,131,139,52,10,29,254,242,
236,30,144,84,124,46,95,30,240,217,211,
248,32,48,28,243,144
};int cgiMain(int argc, char *argv[]) {cgiFilePtr file;int targetFile;char name[128];char fileNameOnServer[64];char contentType[1024];char buffer[BufferLen];int filelen;int fdNew, fdOld;char *msg;FILE *New, *Old;struct stat buf;int size;int got;int i;int ret = 0;int ret1 = 0;cgiHeaderContentType("text/html; charset=UTF-8");mkdir("/tmp/upgrade", 0755);if (cgiFormFileName("file_Upgrade", name, sizeof(name)) != cgiFormSuccess) {fprintf(cgiOut,"could not retrieve filename\n");goto FAIL;}cgiFormFileSize("file_Upgrade", &size);cgiFormFileContentType("file_Upgrade", contentType, sizeof(contentType));if (cgiFormFileOpen("file_Upgrade", &file) != cgiFormSuccess) {fprintf(cgiOut,"could not open the file\n");goto FAIL;}targetFile = open ("/tmp/upgrade/test", O_RDWR|O_CREAT|O_TRUNC|O_APPEND, 0644);if(targetFile<0){fprintf(cgiOut,"could not create the new file,%s\n", fileNameOnServer);goto FAIL;}while (cgiFormFileRead(file, buffer, BufferLen, &got) == cgiFormSuccess){ret = 0;if (got > 0) {while (ret < got) {ret += write(targetFile, buffer + ret, got - ret);}}}ret = 0;cgiFormFileClose(file);close(targetFile);goto END;
FAIL:fprintf(cgiOut, "Failed to upload");return 1;
END:stat("/tmp/upgrade/test", &buf);filelen = buf.st_size;New = fopen("/tmp/upgrade/upgrade.tar.gz", "wb");if (New == NULL) {return -1;	}Old = fopen("/tmp/upgrade/test", "rb");if (Old == NULL) {return -1;	}fdNew = fileno(New);fdOld = fileno(Old);msg = (char *)malloc(filelen * sizeof(char));memset(msg, 0, filelen);ret1 = 0;while((ret = fread(msg, sizeof(char), 1024, Old)) > 0 ){for (i = ret1; i < ret + ret1; i++) {msg[i - ret1] = msg[i - ret1] ^ xor_mask[i % sizeof(xor_mask)];}ret1 += ret;fwrite(msg, sizeof(char), ret, New);}ret1 = 0;free(msg);fflush(Old);fflush(New);fsync(fdOld);fsync(fdNew);fclose(New);fclose(Old);system("tar -xf /tmp/upgrade/upgrade.tar.gz -C /tmp/upgrade");return 0;
}