通过socat bash Web服务器通过HTTP发送图像 [英] Send image over http via socat bash webserver

问题描述

我正在尝试使用socat在bash中编写Web服务器.我在处理图片请求时遇到问题.我正在像这样打开socat监听连接:

I am trying to write a webserver in bash using socat. I am having trouble serving image requests. I'm opening the socat listening connection like so:

socat -T 30 -d -d TCP-L:$LISTENIP,reuseaddr,fork,crlf SYSTEM:"$0 \"docroot=$DOCROOT\""

我使用以下内容提供图像，其中$ 1是docroot，$ 2是图像文件名.

I'm serving the image with the following, where $1 is the docroot and $2 is the image file name.

function serve_png {
  if [ -e $1$2 ]
  then
    SIZE=`stat -c '%s' $1$2`
    echo -ne "HTTP/1.1 200 OK\nContent-type: image/png\nContent-length: $SIZE\n\n"
    cat $1$2
  else
    echo -ne "HTTP/1.1 404 Not Found\nContent-type: text/html\n\n404 - Not found\n"
  fi
}

由于包含错误"，该图像无法在Firefox中显示.我在控制台上得到以下输出.

The image fails to display in firefox due to it "containing errors." I'm getting the following output at console.

2014/01/25 08:00:41 socat[11551] N listening on AF=2 0.0.0.0:8080
2014/01/25 08:00:45 socat[11551] N accepting connection from AF=2 $MYIP:55765 on AF=2 $SERVERIP:8080
2014/01/25 08:00:45 socat[11552] N forking off child, using socket for reading and writing
2014/01/25 08:00:45 socat[11551] N forked off child process 11552
2014/01/25 08:00:45 socat[11551] N listening on AF=2 0.0.0.0:8080
2014/01/25 08:00:45 socat[11552] N forked off child process 11553
2014/01/25 08:00:45 socat[11552] N forked off child process 11553
2014/01/25 08:00:45 socat[11552] N starting data transfer loop with FDs [4,4] and [3,3]
2014/01/25 08:00:45 socat[11552] W read(3, 0x8e2e388, 8192): Connection reset by peer
2014/01/25 08:00:45 socat[11552] N socket 2 to socket 1 is in error
2014/01/25 08:00:45 socat[11552] N socket 2 (fd 3) is at EOF
2014/01/25 08:00:45 socat[11552] N socket 1 (fd 4) is at EOF
2014/01/25 08:00:45 socat[11552] N socket 2 (fd 3) is at EOF
2014/01/25 08:00:45 socat[11552] N exiting with status 0

我已经使用netcat看到了类似的脚本，但是我无法使用socat使其运行.我想继续使用socat，因为它具有分叉和处理多个连接的功能.任何见解将不胜感激.

I have seen similar scripts using netcat, but I'm unable to get it working using socat. I'd like to keep using socat as it has the ability to fork and handle multiple connections. Any insights would be appreciated.

推荐答案

Steffen Ullrich在socat命令中省略了crlf标志.这导致socat自动将回车符/换行符插入流中(因此文件损坏).省略该选项后，一切都会按预期进行.

Steffen Ullrich had it with omitting the crlf flag from the socat command. It was causing Cariage Returns/Line Feeds to be inserted into the stream automatically by socat (hence the file corruption). After omitting that option, everything worked as expected.

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