250aa5bb0
Denis Vlasenko
2008-04-17
Subject
httpd: add an example of POST upload CGI
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networking/httpd_post_upload.txt+76 -0
| @@ -0,0 +1,76 @@ | |
| + | POST upload example: |
| + | |
| + | post_upload.htm |
| + | =============== |
| + | <html> |
| + | <body> |
| + | <form action=/cgi-bin/post_upload.cgi method=post enctype=multipart/form-data> |
| + | File to upload: <input type=file name=file1> <input type=submit> |
| + | </form> |
| + | |
| + | |
| + | post_upload.cgi |
| + | =============== |
| + | #!/bin/sh |
| + | |
| + | # POST upload format: |
| + | # -----------------------------29995809218093749221856446032^M |
| + | # Content-Disposition: form-data; name="file1"; filename="..."^M |
| + | # Content-Type: application/octet-stream^M |
| + | # ^M <--------- headers end with empty line |
| + | # file contents |
| + | # file contents |
| + | # file contents |
| + | # ^M <--------- extra empty line |
| + | # -----------------------------29995809218093749221856446032--^M |
| + | |
| + | # Beware: bashism $'\r' is used to handle ^M |
| + | |
| + | file=/tmp/$$-$RANDOM |
| + | |
| + | # CGI output must start with at least empty line (or headers) |
| + | printf '\r\n' |
| + | |
| + | IFS=$'\r' |
| + | read -r delim_line |
| + | |
| + | IFS='' |
| + | delim_line="${delim_line}--"$'\r' |
| + | |
| + | while read -r line; do |
| + | test "$line" = '' && break |
| + | test "$line" = $'\r' && break |
| + | done |
| + | |
| + | # This will not work well for binary files: bash 3.2 is upset |
| + | # by reading NUL bytes and loses chunks of data. |
| + | # If you are not bothered by having junk appended to the uploaded file, |
| + | # consider using simple "cat >file" instead of the entire |
| + | # fragment below. |
| + | |
| + | while read -r line; do |
| + | |
| + | while test "$line" = $'\r'; do |
| + | read -r line |
| + | test "$line" = "$delim_line" && { |
| + | # Aha! Empty line + delimiter! All done |
| + | cat <<EOF |
| + | <html> |
| + | <body> |
| + | File upload has been accepted |
| + | EOF |
| + | exit 0 |
| + | } |
| + | # Empty line + NOT delimiter. Save empty line, |
| + | # and go check next line |
| + | printf "%s\n" $'\r' -vC >&3 |
| + | done |
| + | # Not empty line - just save |
| + | printf "%s\n" "$line" -vC >&3 |
| + | done 3>"$file" |
| + | |
| + | cat <<EOF |
| + | <html> |
| + | <body> |
| + | File upload was not terminated with '$delim_line' - ??! |
| + | EOF |