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#! /usr/bin/python2.7 # A simple gopher client. # # Usage: gopher [ [selector] host [port] ] import string 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 = string.atoi(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 = string.splitfields(line[1:], 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, 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 string.rjust(repr(i+1), 3) + ':', description, if typename.has_key(typechar): print typename[typechar] else: print '<TYPE=' + repr(typechar) + '>' print while 1: try: str = raw_input('Choice [CR == up a level]: ') except EOFError: print return if not str: return try: choice = string.atoi(str) except string.atoi_error: 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 typebrowser.has_key(typechar): browserfunc = typebrowser[typechar] try: browserfunc(i_selector, i_host, i_port) except (IOError, socket.error): print '***', sys.exc_type, ':', sys.exc_value 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, 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, msg: print 'IOError:', msg x.close() # 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 = raw_input('Query [CR == up a level]: ') except EOFError: print break query = string.strip(query) 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 = raw_input( \ 'Save as file [CR == don\'t save; |pipeline or ~user/... OK]: ') except EOFError: print return None savefile = string.strip(savefile) if not savefile: return None if savefile[0] == '|': cmd = string.strip(savefile[1:]) try: p = os.popen(cmd, 'w') except IOError, 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, 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 = string.atoi(sys.argv[2]) selector = '' host = sys.argv[1] except string.atoi_error: 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()