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Another CGI/shell question (receiving FORM data in script) – PHP Versions

Briefly: After a long time away from web tech, I’m experimenting with it again as I prepare to retire. Thus, this is merely a sandbox experiment I’m trying on my local machine. I’m using the X1 version of Aprelium’s Abyss web server, which I have used for a variety of purposes over the years very successfully.

I have a small sqlite database I’ve set up containing only one table, a guitar inventory. I wish to have a web form requesting the make and model and pass those values to a shell script and return the results in a frame on the web page.

I can successfully run a "select * from" sqlite3 query, but I’m stymied as to how I can receive the form values. From a command line, I can run

make=Fender

model=Telecaster

sqlite3 -list guitardb 'select * from inventory where make = "${make}" and model = "${model}";'

But I can’t seem to capture the FORM data. I created a simple CGI script to show the environment variables returned when the FORM is processed, but there is no QUERY_CONTENT or RESPONSE_QUERY or any data values in the display. I can see POST or GET methods, but neither gives me data.

I know Abyss is not the most well-known web server, but I’ve run it in an office environment using luxcal, and a file upload/download capability, and I even made a mockup phpBB3 forum, so I know it’s possible.

(Why not use php, you may ask? Simply because I’m not wanting to learn a new programming language at the time. As I said, this is a proof of concept, and I’m pretty close, I think). Any assistance will be appreciated.

This is the response from calling my script to display the environment variables. Edited to remove user name. (Sorry for the length). The REQUEST_METHOD (GET in this case) is shown, but not the data:

XPC_SERVICE_NAME=0
PATH=/usr/bin:/bin:/usr/sbin:/sbin
XPC_FLAGS=0x0
SERVER_SOFTWARE=Abyss/2.16.4-X1-macOS AbyssLib/2.16.4
SERVER_PROTOCOL=HTTP/1.1
HTTPS=off
IS_SUBREQ=false
HTTP2=off
COOKIE=phpbb3_qtei6_k=; PHPSESSID=d7mvb47vlrd43160290ugec0n9; PHPSESSIDmycal=d7mvb47vlrd43160290ugec0n9mycal; phpbb3_qtei6_u=2; phpbb3_qtei6_sid=3961a5f7ff7cf89e8b34ab94a5559a7d
SERVER_PORT=80
SERVER_NAME=localhost
SERVER_ADDR=::1
LOCAL_ADDR=::1
REMOTE_ADDR=::1
REMOTE_PORT=62529
REQUEST_URI=/cgi-bin/envvars.sh?
GATEWAY_INTERFACE=CGI/1.1
DOCUMENT_ROOT=/Users/user/Abyss Web Server/htdocs
APPL_MD_PATH=/
APPL_PHYSICAL_PATH=/Users/user/Abyss Web Server/htdocs
URL=/cgi-bin/envvars.sh
SCRIPT_URI=http://localhost/cgi-bin/envvars.sh?
SCRIPT_URL=/cgi-bin/envvars.sh?
SCRIPT_NAME=/cgi-bin/envvars.sh
SCRIPT_FILENAME=/Users/user/Abyss Web Server/htdocs/cgi-bin/envvars.sh
REQUEST_FILENAME=/Users/user/Abyss Web Server/htdocs/cgi-bin/envvars.sh
REQUEST_METHOD=GET
CONTENT_LENGTH=0
HTTP_HOST=localhost
HTTP_CONNECTION=keep-alive
HTTP_SEC_CH_UA="Brave";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
HTTP_SEC_CH_UA_MOBILE=?0
HTTP_SEC_CH_UA_PLATFORM="macOS"
HTTP_UPGRADE_INSECURE_REQUESTS=1
HTTP_USER_AGENT=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
HTTP_ACCEPT=text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8
HTTP_SEC_GPC=1
HTTP_ACCEPT_LANGUAGE=en-US,en
HTTP_SEC_FETCH_SITE=same-origin
HTTP_SEC_FETCH_MODE=navigate
HTTP_SEC_FETCH_USER=?1
HTTP_SEC_FETCH_DEST=document
HTTP_REFERER=http://localhost/envtest.html
HTTP_ACCEPT_ENCODING=gzip, deflate, br
HTTP_COOKIE=phpbb3_qtei6_k=; PHPSESSID=d7mvb47vlrd43160290ugec0n9; PHPSESSIDmycal=d7mvb47vlrd43160290ugec0n9mycal; phpbb3_qtei6_u=2; phpbb3_qtei6_sid=3961a5f7ff7cf89e8b34ab94a5559a7d
ALL_HTTP=HTTP_HOST: localhost
HTTP_CONNECTION: keep-alive
HTTP_SEC_CH_UA: "Brave";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
HTTP_SEC_CH_UA_MOBILE: ?0
HTTP_SEC_CH_UA_PLATFORM: "macOS"
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8
HTTP_SEC_GPC: 1
HTTP_ACCEPT_LANGUAGE: en-US,en
HTTP_SEC_FETCH_SITE: same-origin
HTTP_SEC_FETCH_MODE: navigate
HTTP_SEC_FETCH_USER: ?1
HTTP_SEC_FETCH_DEST: document
HTTP_REFERER: http://localhost/envtest.html
HTTP_ACCEPT_ENCODING: gzip, deflate, br
HTTP_COOKIE: phpbb3_qtei6_k=; PHPSESSID=d7mvb47vlrd43160290ugec0n9; PHPSESSIDmycal=d7mvb47vlrd43160290ugec0n9mycal; phpbb3_qtei6_u=2; phpbb3_qtei6_sid=3961a5f7ff7cf89e8b34ab94a5559a7d

ALL_RAW=Host: localhost
Connection: keep-alive
sec-ch-ua: "Brave";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8
Sec-GPC: 1
Accept-Language: en-US,en
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/envtest.html
Accept-Encoding: gzip, deflate, br
Cookie: phpbb3_qtei6_k=; PHPSESSID=d7mvb47vlrd43160290ugec0n9; PHPSESSIDmycal=d7mvb47vlrd43160290ugec0n9mycal; phpbb3_qtei6_u=2; phpbb3_qtei6_sid=3961a5f7ff7cf89e8b34ab94a5559a7d

INSTANCE_ID=0
X_ABYSS_STATS_SERVER_TOTAL=4398
X_ABYSS_STATS_SERVER_ERROR=211
X_ABYSS_STATS_SERVER_HTML=656
X_ABYSS_STATS_SERVER_IMAGE=768
X_ABYSS_STATS_SERVER_NOTMODIFIED=884
X_ABYSS_STATS_SERVER_OUTPUT=30538689
X_ABYSS_STATS_SERVER_UPTIME=5640289
X_ABYSS_STATS_SERVER_CURRENT_UPTIME=677192
X_ABYSS_STATS_HOST_TOTAL=4398
X_ABYSS_STATS_HOST_ERROR=211
X_ABYSS_STATS_HOST_HTML=656
X_ABYSS_STATS_HOST_IMAGE=768
X_ABYSS_STATS_HOST_NOTMODIFIED=884
X_ABYSS_STATS_HOST_OUTPUT=30538689
X_ABYSS_STATS_HOST_UPTIME=5640127
X_ABYSS_STATS_HOST_CURRENT_UPTIME=677192
X_ABYSS_STATS_HOST_COMPRESS_TOTAL=1273
X_ABYSS_STATS_HOST_COMPRESS_OUTPUT=2968368
X_ABYSS_STATS_HOST_COMPRESS_ORIGINAL_OUTPUT=12760398
X_ABYSS_STATS_SERVER_COMPRESS_TOTAL=1938
X_ABYSS_STATS_SERVER_COMPRESS_OUTPUT=5098202
X_ABYSS_STATS_SERVER_COMPRESS_ORIGINAL_OUTPUT=22201933
HOME=/Users/user
LOGNAME=root
SHLVL=1
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Every day is an improvement. I have resolved the issue of passing POST (and GET) data to a shell script. Thanks to other posts and hints, here is the solution, in brief.

    In my HTML page, I have a form that uses the POST method to pass the values from two inputs: MAKE and MODEL. That form calls a shell script which contains:

    setIFS=$IFS
IFS="=&"
tag=(`cat < vars.txt`)

    The effect of setting IFS to "=&" strips out the single line POST data (e.g., name=Martin&model=D18) into an array of 4 words. Words 2 and 4 make up the parameters to pass to the sqlite query. I added code to clarify this:

    mk="${tag[2]}"
md="${tag[4]}"

    And the finished query is

    sqlite3 -box $db "select * from inventory where make like "%$mk%" and model like "%$md%";"

    This all runs fine from the command line. The next step is to wrap it in HTML to render it on a web page... (e.g.,


  2. 0

    SQL string delimiter is a single quote, while you are providing double quotes.
    Additionally, the single quote probably hinder variable replacement.

    In such a case, you should redirect stderr to stdout to see evtl. error output.
    To check var resolving, exchange "sqlite" with "cat" and try to use a here-document instead of cmdline param wherever possible:

    cat << .EndOfInput
bla bla bla
${sausageDog}
blub
.EndOfInput

    this way, you don’t have to care so much about escaping quotes and stuff.

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