This shit right here

import requests
from bs4 import BeautifulSoup
from os import walk

def main():
    thread="http://lupchan.org/b/res/535.html"
    directory = r"C:\Users\usernamegoeshere\Desktop\dump"
    args=read_fields(thread)
    print "Thread page read"

    c=0
    for file in walk(directory).next()[2]:
        upload_file(directory+'\\'+file, args)
        c += 1
        if c>=10: #get again
            args = read_fields(thread)
            c = 0



def upload_file(nom, args):
    args["name"]="Furfriend"
    args["password"]="12345678"
    args["subject"]="Testan"
    args["email"]=""
    args["body"]="Testing, testing, do you read me?"
    args["embed"]=""
    #args["spoiler"]="on"

    f = {'file': open(nom, 'rb')}
    response = requests.post("http://lupchan.org/post.php", data=args, files=f)    #does this go like this? No idea, requests has no proper documentation, but wireshark seems to confirm it works

    print response.content #"Error: you didn't make a post ha ha fuck you"

def read_fields(thread):
    """Gets a website, returns a dict with all inputs and textareas in the first <form>, just like they'd be sent if you submitted it:
    <input name="thread" value="8848" type="text">
    <textarea name="search" style="display:none">1234qwertyuiop</textarea>
    returns {"thread":"8848", "search":"1234qwertyuiop"}
    """
    r = {}
    t=requests.get(thread).text
    doc = BeautifulSoup(t)
    for input in doc.form.find_all("input"):
        if not input['type'] in ("text", "hidden", "password"):
            continue
        print "OK"
        assert input['name'] not in r
        if input.has_attr('value'):
            r[input['name']] = input['value']
        else:
            r[input['name']] = ""

    for textarea in doc.form.find_all("textarea"):
        if textarea.string: #actually a <class 'bs4.element.NavigableString'>
            r[textarea['name']] = unicode(textarea.string)
        else: # textarea.string == None
            r[textarea['name']] = ""
    return r


main()



"""
Important values:
"thread"="1234" (no need to change)
"board"="s4s"   (no need to change)
"name" =[name]
"email"=[email]
"subject"=[subject]
"spoiler" (checkbox, "on" or nothing)
"body"=[text]  (textarea)
"file"=[file]  (type=file)
"embed"=[embed]
"password"=[password]



<form name="post" onsubmit="return dopost(this);" enctype="multipart/form-data" action="/post.php" method="post">
<input type="hidden" name="thread" value="8848">
<input type="text" name="firstname" value="">
<input type="hidden" name="board" value="s4s">
<input style="display:none" type="text" name="url" value="">
<textarea name="search" style="display:none">'W&lt;JxUo+ENq QX\@&gt;w,D;O[u0c*(S.^YHpvBT3/t6hMKd29$P:=%|L?~rkeCimA-yb5lgsZa4I1n_&amp;#7G]F!{)z8</textarea>
<input type="text" name="name" size="25" maxlength="35" autocomplete="off">
<input type="text" name="message" value="N}K,{=:AbHr0V#mv5o9F3;e^+Mfh&gt;Z_).~L681]iks%q|WET$Rp&amp;[2@-4BwO7GudCxPSt">
<input style="display:none" type="text" name="text" value="">
<input type="text" name="email" size="25" maxlength="40" autocomplete="off">
<input style="float:left;" type="text" name="subject" size="25" maxlength="100" autocomplete="off">
<input accesskey="s" style="margin-left:2px;" type="submit" name="post" value="New Reply" />
<input id="spoiler" name="spoiler" type="checkbox">
<textarea name="body" id="body" rows="5" cols="35"></textarea>
<input type="file" name="file">
<input type="text" name="embed" size="30" maxlength="120" autocomplete="off">
<input type="password" name="password" size="12" maxlength="18" autocomplete="off">
<input type="hidden" name="hash" value="04fdae57d2a623c4c3445ae40492a6de6887fa60">

</form>
"""