summaryrefslogtreecommitdiffstats
path: root/Demo/sockets/gopher.py
diff options
context:
space:
mode:
Diffstat (limited to 'Demo/sockets/gopher.py')
-rwxr-xr-xDemo/sockets/gopher.py352
1 files changed, 0 insertions, 352 deletions
diff --git a/Demo/sockets/gopher.py b/Demo/sockets/gopher.py
deleted file mode 100755
index bd29ec0..0000000
--- a/Demo/sockets/gopher.py
+++ /dev/null
@@ -1,352 +0,0 @@
-#! /usr/bin/env python3
-
-# A simple gopher client.
-#
-# Usage: gopher [ [selector] host [port] ]
-
-import sys
-import os
-import socket
-
-# Default selector, host and port
-DEF_SELECTOR = ''
-DEF_HOST = 'gopher.micro.umn.edu'
-DEF_PORT = 70
-
-# Recognized file types
-T_TEXTFILE = '0'
-T_MENU = '1'
-T_CSO = '2'
-T_ERROR = '3'
-T_BINHEX = '4'
-T_DOS = '5'
-T_UUENCODE = '6'
-T_SEARCH = '7'
-T_TELNET = '8'
-T_BINARY = '9'
-T_REDUNDANT = '+'
-T_SOUND = 's'
-
-# Dictionary mapping types to strings
-typename = {'0': '<TEXT>', '1': '<DIR>', '2': '<CSO>', '3': '<ERROR>', \
- '4': '<BINHEX>', '5': '<DOS>', '6': '<UUENCODE>', '7': '<SEARCH>', \
- '8': '<TELNET>', '9': '<BINARY>', '+': '<REDUNDANT>', 's': '<SOUND>'}
-
-# Oft-used characters and strings
-CRLF = '\r\n'
-TAB = '\t'
-
-# Open a TCP connection to a given host and port
-def open_socket(host, port):
- if not port:
- port = DEF_PORT
- elif type(port) == type(''):
- port = int(port)
- s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
- s.connect((host, port))
- return s
-
-# Send a selector to a given host and port, return a file with the reply
-def send_request(selector, host, port):
- s = open_socket(host, port)
- s.send(selector + CRLF)
- s.shutdown(1)
- return s.makefile('r')
-
-# Get a menu in the form of a list of entries
-def get_menu(selector, host, port):
- f = send_request(selector, host, port)
- list = []
- while 1:
- line = f.readline()
- if not line:
- print('(Unexpected EOF from server)')
- break
- if line[-2:] == CRLF:
- line = line[:-2]
- elif line[-1:] in CRLF:
- line = line[:-1]
- if line == '.':
- break
- if not line:
- print('(Empty line from server)')
- continue
- typechar = line[0]
- parts = line[1:].split(TAB)
- if len(parts) < 4:
- print('(Bad line from server: %r)' % (line,))
- continue
- if len(parts) > 4:
- print('(Extra info from server: %r)' % (parts[4:],))
- parts.insert(0, typechar)
- list.append(parts)
- f.close()
- return list
-
-# Get a text file as a list of lines, with trailing CRLF stripped
-def get_textfile(selector, host, port):
- list = []
- get_alt_textfile(selector, host, port, list.append)
- return list
-
-# Get a text file and pass each line to a function, with trailing CRLF stripped
-def get_alt_textfile(selector, host, port, func):
- f = send_request(selector, host, port)
- while 1:
- line = f.readline()
- if not line:
- print('(Unexpected EOF from server)')
- break
- if line[-2:] == CRLF:
- line = line[:-2]
- elif line[-1:] in CRLF:
- line = line[:-1]
- if line == '.':
- break
- if line[:2] == '..':
- line = line[1:]
- func(line)
- f.close()
-
-# Get a binary file as one solid data block
-def get_binary(selector, host, port):
- f = send_request(selector, host, port)
- data = f.read()
- f.close()
- return data
-
-# Get a binary file and pass each block to a function
-def get_alt_binary(selector, host, port, func, blocksize):
- f = send_request(selector, host, port)
- while 1:
- data = f.read(blocksize)
- if not data:
- break
- func(data)
-
-# A *very* simple interactive browser
-
-# Browser main command, has default arguments
-def browser(*args):
- selector = DEF_SELECTOR
- host = DEF_HOST
- port = DEF_PORT
- n = len(args)
- if n > 0 and args[0]:
- selector = args[0]
- if n > 1 and args[1]:
- host = args[1]
- if n > 2 and args[2]:
- port = args[2]
- if n > 3:
- raise RuntimeError('too many args')
- try:
- browse_menu(selector, host, port)
- except socket.error as msg:
- print('Socket error:', msg)
- sys.exit(1)
- except KeyboardInterrupt:
- print('\n[Goodbye]')
-
-# Browse a menu
-def browse_menu(selector, host, port):
- list = get_menu(selector, host, port)
- while 1:
- print('----- MENU -----')
- print('Selector:', repr(selector))
- print('Host:', host, ' Port:', port)
- print()
- for i in range(len(list)):
- item = list[i]
- typechar, description = item[0], item[1]
- print(repr(i+1).rjust(3) + ':', description, end=' ')
- if typechar in typename:
- print(typename[typechar])
- else:
- print('<TYPE=' + repr(typechar) + '>')
- print()
- while 1:
- try:
- str = input('Choice [CR == up a level]: ')
- except EOFError:
- print()
- return
- if not str:
- return
- try:
- choice = int(str)
- except ValueError:
- print('Choice must be a number; try again:')
- continue
- if not 0 < choice <= len(list):
- print('Choice out of range; try again:')
- continue
- break
- item = list[choice-1]
- typechar = item[0]
- [i_selector, i_host, i_port] = item[2:5]
- if typechar in typebrowser:
- browserfunc = typebrowser[typechar]
- try:
- browserfunc(i_selector, i_host, i_port)
- except (IOError, socket.error):
- t, v, tb = sys.exc_info()
- print('***', t, ':', v)
- else:
- print('Unsupported object type')
-
-# Browse a text file
-def browse_textfile(selector, host, port):
- x = None
- try:
- p = os.popen('${PAGER-more}', 'w')
- x = SaveLines(p)
- get_alt_textfile(selector, host, port, x.writeln)
- except IOError as msg:
- print('IOError:', msg)
- if x:
- x.close()
- f = open_savefile()
- if not f:
- return
- x = SaveLines(f)
- try:
- get_alt_textfile(selector, host, port, x.writeln)
- print('Done.')
- except IOError as msg:
- print('IOError:', msg)
- x.close()
-
-def raw_input(prompt):
- sys.stdout.write(prompt)
- sys.stdout.flush()
- return sys.stdin.readline()
-
-# Browse a search index
-def browse_search(selector, host, port):
- while 1:
- print('----- SEARCH -----')
- print('Selector:', repr(selector))
- print('Host:', host, ' Port:', port)
- print()
- try:
- query = input('Query [CR == up a level]: ')
- except EOFError:
- print()
- break
- query = query.strip()
- if not query:
- break
- if '\t' in query:
- print('Sorry, queries cannot contain tabs')
- continue
- browse_menu(selector + TAB + query, host, port)
-
-# "Browse" telnet-based information, i.e. open a telnet session
-def browse_telnet(selector, host, port):
- if selector:
- print('Log in as', repr(selector))
- if type(port) != type(''):
- port = repr(port)
- sts = os.system('set -x; exec telnet ' + host + ' ' + port)
- if sts:
- print('Exit status:', sts)
-
-# "Browse" a binary file, i.e. save it to a file
-def browse_binary(selector, host, port):
- f = open_savefile()
- if not f:
- return
- x = SaveWithProgress(f)
- get_alt_binary(selector, host, port, x.write, 8*1024)
- x.close()
-
-# "Browse" a sound file, i.e. play it or save it
-def browse_sound(selector, host, port):
- browse_binary(selector, host, port)
-
-# Dictionary mapping types to browser functions
-typebrowser = {'0': browse_textfile, '1': browse_menu, \
- '4': browse_binary, '5': browse_binary, '6': browse_textfile, \
- '7': browse_search, \
- '8': browse_telnet, '9': browse_binary, 's': browse_sound}
-
-# Class used to save lines, appending a newline to each line
-class SaveLines:
- def __init__(self, f):
- self.f = f
- def writeln(self, line):
- self.f.write(line + '\n')
- def close(self):
- sts = self.f.close()
- if sts:
- print('Exit status:', sts)
-
-# Class used to save data while showing progress
-class SaveWithProgress:
- def __init__(self, f):
- self.f = f
- def write(self, data):
- sys.stdout.write('#')
- sys.stdout.flush()
- self.f.write(data)
- def close(self):
- print()
- sts = self.f.close()
- if sts:
- print('Exit status:', sts)
-
-# Ask for and open a save file, or return None if not to save
-def open_savefile():
- try:
- savefile = input( \
- 'Save as file [CR == don\'t save; |pipeline or ~user/... OK]: ')
- except EOFError:
- print()
- return None
- savefile = savefile.strip()
- if not savefile:
- return None
- if savefile[0] == '|':
- cmd = savefile[1:].strip()
- try:
- p = os.popen(cmd, 'w')
- except IOError as msg:
- print(repr(cmd), ':', msg)
- return None
- print('Piping through', repr(cmd), '...')
- return p
- if savefile[0] == '~':
- savefile = os.path.expanduser(savefile)
- try:
- f = open(savefile, 'w')
- except IOError as msg:
- print(repr(savefile), ':', msg)
- return None
- print('Saving to', repr(savefile), '...')
- return f
-
-# Test program
-def test():
- if sys.argv[4:]:
- print('usage: gopher [ [selector] host [port] ]')
- sys.exit(2)
- elif sys.argv[3:]:
- browser(sys.argv[1], sys.argv[2], sys.argv[3])
- elif sys.argv[2:]:
- try:
- port = int(sys.argv[2])
- selector = ''
- host = sys.argv[1]
- except ValueError:
- selector = sys.argv[1]
- host = sys.argv[2]
- port = ''
- browser(selector, host, port)
- elif sys.argv[1:]:
- browser('', sys.argv[1])
- else:
- browser()
-
-# Call the test program as a main program
-test()
generated by cgit v0.12 at 2025-01-11 03:19:55 (GMT)