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解决boa网页操作出现502 Bad Gateway The CGI was not CGI/1.1 compliant的一种可能

分类: IT文章 • 2025-01-03 11:20:43

最近在把一套网页操作的接口从原来Android5.0上移植到Android7.0上。

客户端连接验证的时候主页显示异常

502 Bad Gateway The CGI was not CGI/1.1 compliant

从板子的串口上看到log显示为

[02/Jan/1970:17:13:49 +0000] cgi_header: unable to find LFLF

这部分log为boa里面打印出来的，跟踪源码在cgi_header.c关键函数如下

                                                                              
  45 /* TODO:                                                                      
  46  We still need to cycle through the data before the end of the headers,       
  47  line-by-line, and check for any problems with the CGI                        
  48  outputting overriding http responses, etc...                                 
  49  */                                                                           
  50                                                                               
  51 int process_cgi_header(request * req)                                         
  52 {                                                                             
  53     char *buf;                                                                
  54     char *c;                                                                  
  55                                                                               
  56     if (req->cgi_status != CGI_DONE)                                          
  57         req->cgi_status = CGI_BUFFER;                                         
  58                                                                               
  59     buf = req->header_line;                                                   
  60                                                                               
  61     c = strstr(buf, "

");                                                
  62     if (c == NULL) {                                                          
  63         c = strstr(buf, "

");                                              
  64         if (c == NULL) {                                                      
  65             log_error_time();                                                 
  66             fputs("cgi_header: unable to find LFLF
", stderr);               
  67 #ifdef FASCIST_LOGGING                                                        
  68             log_error_time();                                                 
  69             fprintf(stderr, ""%s"
", buf);                                 
  70 #endif                                                                        
  71             send_r_bad_gateway(req);                                          
  72             return 0;                                                         
  73         }                                                                     
  74     }                                                                         
  75     if (req->simple) {                                                        
  76         if (*(c + 1) == '
')                                                 
  77             req->header_line = c + 2;                                         
  78         else                                                                  
  79             req->header_line = c + 1;                                         
  80         return 1;                                                             
  81     }

该函数

process_cgi_header
是boa父进程fork出子进去去执行对应的cgi程序后，通过管道来获取cgi执行的输出内容进行解析，从而对客户端进行相应。
在src/pipe.c调用如下：
                                                                               
  27 /*                                                                            
  28  * Name: read_from_pipe                                                       
  29  * Description: Reads data from a pipe                                        
  30  *                                                                            
  31  * Return values:                                                             
  32  *  -1: request blocked, move to blocked queue                                
  33  *   0: EOF or error, close it down                                           
  34  *   1: successful read, recycle in ready queue                               
  35  */                                                                           
  36                                                                               
  37 int read_from_pipe(request * req)                                             
  38 {                                                                             
  39     int bytes_read, bytes_to_read =                                           
  40         BUFFER_SIZE - (req->header_end - req->buffer);                        
  41                                                                               
  42     if (bytes_to_read == 0) {   /* buffer full */                             
  43         if (req->cgi_status == CGI_PARSE) { /* got+parsed header */           
  44             req->cgi_status = CGI_BUFFER;                                     
  45             *req->header_end = '

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