mirror of
https://github.com/python/cpython.git
synced 2024-12-11 10:50:11 +08:00
321 lines
10 KiB
Python
321 lines
10 KiB
Python
"""CGI-savvy HTTP Server.
|
|
|
|
This module builds on SimpleHTTPServer by implementing GET and POST
|
|
requests to cgi-bin scripts.
|
|
|
|
If the os.fork() function is not present (e.g. on Windows),
|
|
os.popen2() is used as a fallback, with slightly altered semantics; if
|
|
that function is not present either (e.g. on Macintosh), only Python
|
|
scripts are supported, and they are executed by the current process.
|
|
|
|
In all cases, the implementation is intentionally naive -- all
|
|
requests are executed sychronously.
|
|
|
|
SECURITY WARNING: DON'T USE THIS CODE UNLESS YOU ARE INSIDE A FIREWALL
|
|
-- it may execute arbitrary Python code or external programs.
|
|
|
|
"""
|
|
|
|
|
|
__version__ = "0.4"
|
|
|
|
__all__ = ["CGIHTTPRequestHandler"]
|
|
|
|
import os
|
|
import sys
|
|
import urllib
|
|
import BaseHTTPServer
|
|
import SimpleHTTPServer
|
|
|
|
|
|
class CGIHTTPRequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
|
|
|
|
"""Complete HTTP server with GET, HEAD and POST commands.
|
|
|
|
GET and HEAD also support running CGI scripts.
|
|
|
|
The POST command is *only* implemented for CGI scripts.
|
|
|
|
"""
|
|
|
|
# Determine platform specifics
|
|
have_fork = hasattr(os, 'fork')
|
|
have_popen2 = hasattr(os, 'popen2')
|
|
have_popen3 = hasattr(os, 'popen3')
|
|
|
|
# Make rfile unbuffered -- we need to read one line and then pass
|
|
# the rest to a subprocess, so we can't use buffered input.
|
|
rbufsize = 0
|
|
|
|
def do_POST(self):
|
|
"""Serve a POST request.
|
|
|
|
This is only implemented for CGI scripts.
|
|
|
|
"""
|
|
|
|
if self.is_cgi():
|
|
self.run_cgi()
|
|
else:
|
|
self.send_error(501, "Can only POST to CGI scripts")
|
|
|
|
def send_head(self):
|
|
"""Version of send_head that support CGI scripts"""
|
|
if self.is_cgi():
|
|
return self.run_cgi()
|
|
else:
|
|
return SimpleHTTPServer.SimpleHTTPRequestHandler.send_head(self)
|
|
|
|
def is_cgi(self):
|
|
"""Test whether self.path corresponds to a CGI script.
|
|
|
|
Return a tuple (dir, rest) if self.path requires running a
|
|
CGI script, None if not. Note that rest begins with a
|
|
slash if it is not empty.
|
|
|
|
The default implementation tests whether the path
|
|
begins with one of the strings in the list
|
|
self.cgi_directories (and the next character is a '/'
|
|
or the end of the string).
|
|
|
|
"""
|
|
|
|
path = self.path
|
|
|
|
for x in self.cgi_directories:
|
|
i = len(x)
|
|
if path[:i] == x and (not path[i:] or path[i] == '/'):
|
|
self.cgi_info = path[:i], path[i+1:]
|
|
return 1
|
|
return 0
|
|
|
|
cgi_directories = ['/cgi-bin', '/htbin']
|
|
|
|
def is_executable(self, path):
|
|
"""Test whether argument path is an executable file."""
|
|
return executable(path)
|
|
|
|
def is_python(self, path):
|
|
"""Test whether argument path is a Python script."""
|
|
head, tail = os.path.splitext(path)
|
|
return tail.lower() in (".py", ".pyw")
|
|
|
|
def run_cgi(self):
|
|
"""Execute a CGI script."""
|
|
dir, rest = self.cgi_info
|
|
i = rest.rfind('?')
|
|
if i >= 0:
|
|
rest, query = rest[:i], rest[i+1:]
|
|
else:
|
|
query = ''
|
|
i = rest.find('/')
|
|
if i >= 0:
|
|
script, rest = rest[:i], rest[i:]
|
|
else:
|
|
script, rest = rest, ''
|
|
scriptname = dir + '/' + script
|
|
scriptfile = self.translate_path(scriptname)
|
|
if not os.path.exists(scriptfile):
|
|
self.send_error(404, "No such CGI script (%s)" % `scriptname`)
|
|
return
|
|
if not os.path.isfile(scriptfile):
|
|
self.send_error(403, "CGI script is not a plain file (%s)" %
|
|
`scriptname`)
|
|
return
|
|
ispy = self.is_python(scriptname)
|
|
if not ispy:
|
|
if not (self.have_fork or self.have_popen2 or self.have_popen3):
|
|
self.send_error(403, "CGI script is not a Python script (%s)" %
|
|
`scriptname`)
|
|
return
|
|
if not self.is_executable(scriptfile):
|
|
self.send_error(403, "CGI script is not executable (%s)" %
|
|
`scriptname`)
|
|
return
|
|
|
|
# Reference: http://hoohoo.ncsa.uiuc.edu/cgi/env.html
|
|
# XXX Much of the following could be prepared ahead of time!
|
|
env = {}
|
|
env['SERVER_SOFTWARE'] = self.version_string()
|
|
env['SERVER_NAME'] = self.server.server_name
|
|
env['GATEWAY_INTERFACE'] = 'CGI/1.1'
|
|
env['SERVER_PROTOCOL'] = self.protocol_version
|
|
env['SERVER_PORT'] = str(self.server.server_port)
|
|
env['REQUEST_METHOD'] = self.command
|
|
uqrest = urllib.unquote(rest)
|
|
env['PATH_INFO'] = uqrest
|
|
env['PATH_TRANSLATED'] = self.translate_path(uqrest)
|
|
env['SCRIPT_NAME'] = scriptname
|
|
if query:
|
|
env['QUERY_STRING'] = query
|
|
host = self.address_string()
|
|
if host != self.client_address[0]:
|
|
env['REMOTE_HOST'] = host
|
|
env['REMOTE_ADDR'] = self.client_address[0]
|
|
# XXX AUTH_TYPE
|
|
# XXX REMOTE_USER
|
|
# XXX REMOTE_IDENT
|
|
if self.headers.typeheader is None:
|
|
env['CONTENT_TYPE'] = self.headers.type
|
|
else:
|
|
env['CONTENT_TYPE'] = self.headers.typeheader
|
|
length = self.headers.getheader('content-length')
|
|
if length:
|
|
env['CONTENT_LENGTH'] = length
|
|
accept = []
|
|
for line in self.headers.getallmatchingheaders('accept'):
|
|
if line[:1] in "\t\n\r ":
|
|
accept.append(line.strip())
|
|
else:
|
|
accept = accept + line[7:].split(',')
|
|
env['HTTP_ACCEPT'] = ','.join(accept)
|
|
ua = self.headers.getheader('user-agent')
|
|
if ua:
|
|
env['HTTP_USER_AGENT'] = ua
|
|
co = filter(None, self.headers.getheaders('cookie'))
|
|
if co:
|
|
env['HTTP_COOKIE'] = ', '.join(co)
|
|
# XXX Other HTTP_* headers
|
|
if not self.have_fork:
|
|
# Since we're setting the env in the parent, provide empty
|
|
# values to override previously set values
|
|
for k in ('QUERY_STRING', 'REMOTE_HOST', 'CONTENT_LENGTH',
|
|
'HTTP_USER_AGENT', 'HTTP_COOKIE'):
|
|
env.setdefault(k, "")
|
|
|
|
self.send_response(200, "Script output follows")
|
|
|
|
decoded_query = query.replace('+', ' ')
|
|
|
|
if self.have_fork:
|
|
# Unix -- fork as we should
|
|
args = [script]
|
|
if '=' not in decoded_query:
|
|
args.append(decoded_query)
|
|
nobody = nobody_uid()
|
|
self.rfile.flush() # Always flush before forking
|
|
self.wfile.flush() # Always flush before forking
|
|
pid = os.fork()
|
|
if pid != 0:
|
|
# Parent
|
|
pid, sts = os.waitpid(pid, 0)
|
|
if sts:
|
|
self.log_error("CGI script exit status %#x", sts)
|
|
return
|
|
# Child
|
|
try:
|
|
try:
|
|
os.setuid(nobody)
|
|
except os.error:
|
|
pass
|
|
os.dup2(self.rfile.fileno(), 0)
|
|
os.dup2(self.wfile.fileno(), 1)
|
|
os.execve(scriptfile, args, env)
|
|
except:
|
|
self.server.handle_error(self.request, self.client_address)
|
|
os._exit(127)
|
|
|
|
elif self.have_popen2 or self.have_popen3:
|
|
# Windows -- use popen2 or popen3 to create a subprocess
|
|
import shutil
|
|
if self.have_popen3:
|
|
popenx = os.popen3
|
|
else:
|
|
popenx = os.popen2
|
|
os.environ.update(env)
|
|
cmdline = scriptfile
|
|
if self.is_python(scriptfile):
|
|
interp = sys.executable
|
|
if interp.lower().endswith("w.exe"):
|
|
# On Windows, use python.exe, not pythonw.exe
|
|
interp = interp[:-5] + interp[-4:]
|
|
cmdline = "%s -u %s" % (interp, cmdline)
|
|
if '=' not in query and '"' not in query:
|
|
cmdline = '%s "%s"' % (cmdline, query)
|
|
self.log_message("command: %s", cmdline)
|
|
try:
|
|
nbytes = int(length)
|
|
except ValueError:
|
|
nbytes = 0
|
|
files = popenx(cmdline, 'b')
|
|
fi = files[0]
|
|
fo = files[1]
|
|
if self.have_popen3:
|
|
fe = files[2]
|
|
if self.command.lower() == "post" and nbytes > 0:
|
|
data = self.rfile.read(nbytes)
|
|
fi.write(data)
|
|
fi.close()
|
|
shutil.copyfileobj(fo, self.wfile)
|
|
if self.have_popen3:
|
|
errors = fe.read()
|
|
fe.close()
|
|
if errors:
|
|
self.log_error('%s', errors)
|
|
sts = fo.close()
|
|
if sts:
|
|
self.log_error("CGI script exit status %#x", sts)
|
|
else:
|
|
self.log_message("CGI script exited OK")
|
|
|
|
else:
|
|
# Other O.S. -- execute script in this process
|
|
os.environ.update(env)
|
|
save_argv = sys.argv
|
|
save_stdin = sys.stdin
|
|
save_stdout = sys.stdout
|
|
save_stderr = sys.stderr
|
|
try:
|
|
try:
|
|
sys.argv = [scriptfile]
|
|
if '=' not in decoded_query:
|
|
sys.argv.append(decoded_query)
|
|
sys.stdout = self.wfile
|
|
sys.stdin = self.rfile
|
|
execfile(scriptfile, {"__name__": "__main__"})
|
|
finally:
|
|
sys.argv = save_argv
|
|
sys.stdin = save_stdin
|
|
sys.stdout = save_stdout
|
|
sys.stderr = save_stderr
|
|
except SystemExit, sts:
|
|
self.log_error("CGI script exit status %s", str(sts))
|
|
else:
|
|
self.log_message("CGI script exited OK")
|
|
|
|
|
|
nobody = None
|
|
|
|
def nobody_uid():
|
|
"""Internal routine to get nobody's uid"""
|
|
global nobody
|
|
if nobody:
|
|
return nobody
|
|
try:
|
|
import pwd
|
|
except ImportError:
|
|
return -1
|
|
try:
|
|
nobody = pwd.getpwnam('nobody')[2]
|
|
except KeyError:
|
|
nobody = 1 + max(map(lambda x: x[2], pwd.getpwall()))
|
|
return nobody
|
|
|
|
|
|
def executable(path):
|
|
"""Test for executable file."""
|
|
try:
|
|
st = os.stat(path)
|
|
except os.error:
|
|
return 0
|
|
return st[0] & 0111 != 0
|
|
|
|
|
|
def test(HandlerClass = CGIHTTPRequestHandler,
|
|
ServerClass = BaseHTTPServer.HTTPServer):
|
|
SimpleHTTPServer.test(HandlerClass, ServerClass)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test()
|