3096ed75 |
1 | #!/usr/bin/perl |
2 | # |
3 | # Script to retrieve a single article from a news server, either by |
4 | # message-id or by group name and article number. |
5 | # |
6 | # Usage: nntpid <messageid> |
7 | # or: nntpid messageid (angle brackets optional) |
8 | # or: nntpid news.group.name 1234 (group+number form) |
9 | # |
10 | # The name of your news server is obtained from the environment variable |
11 | # NNTPSERVER, or from the file /etc/nntpserver if that's not set. |
12 | # |
13 | # This script supports AUTHINFO GENERIC authentication using the |
14 | # environment variable NNTPAUTH. It will only attempt this if it receives |
15 | # a 480 response from the news server; if your news server isn't paranoid |
16 | # then the script will never need to look at NNTPAUTH. |
17 | |
18 | # Copyright 2000 Simon Tatham. All rights reserved. |
19 | # FIXME: put in a licence notice. |
20 | |
21 | require 5.002; |
22 | use Socket; |
23 | use FileHandle; |
24 | |
25 | $usage = |
26 | "usage: nntpid [ -v ] <message-id>\n" . |
27 | " or: nntpid [ -v ] <newsgroup> <article-number>\n" . |
28 | "where: -v verbose (print interaction with news server)\n" . |
29 | " also: nntpid --version report version number\n" . |
30 | " nntpid --help display this help text\n" . |
31 | " nntpid --licence display (MIT) licence text\n"; |
32 | |
33 | $licence = |
34 | "nntpid is copyright 2000,2004 Simon Tatham.\n" . |
35 | "\n" . |
36 | "Permission is hereby granted, free of charge, to any person\n" . |
37 | "obtaining a copy of this software and associated documentation files\n" . |
38 | "(the \"Software\"), to deal in the Software without restriction,\n" . |
39 | "including without limitation the rights to use, copy, modify, merge,\n" . |
40 | "publish, distribute, sublicense, and/or sell copies of the Software,\n" . |
41 | "and to permit persons to whom the Software is furnished to do so,\n" . |
42 | "subject to the following conditions:\n" . |
43 | "\n" . |
44 | "The above copyright notice and this permission notice shall be\n" . |
45 | "included in all copies or substantial portions of the Software.\n" . |
46 | "\n" . |
47 | "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n" . |
48 | "EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n" . |
49 | "MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\n" . |
50 | "NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS\n" . |
51 | "BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN\n" . |
52 | "ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\n" . |
53 | "CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n" . |
54 | "SOFTWARE.\n"; |
55 | |
56 | while ($ARGV[0] =~ /^-(.+)$/) { |
57 | shift @ARGV; |
58 | $verbose=1, next if $1 eq "v"; |
59 | if ($1 eq "-help") { |
60 | print STDERR $usage; |
61 | exit 0; |
62 | } elsif ($1 eq "-version") { |
63 | if ('$Revision$' =~ /Revision:\s+(\d+)/) { |
64 | print "nntpid revision $1\n"; |
65 | } else { |
66 | print "nntpid: unknown revision\n"; |
67 | } |
68 | exit 0; |
69 | } elsif ($1 eq "-licence" or $1 eq "-license") { |
70 | print $licence; |
71 | exit 0; |
72 | } |
73 | } |
74 | |
75 | die $usage if !defined $ARGV[0]; |
76 | |
77 | if (defined $ARGV[1]) { |
78 | $group = $ARGV[0]; |
79 | $mid = $ARGV[1]; |
80 | } else { |
81 | $group = "misc.misc"; |
82 | $mid = $ARGV[0]; |
83 | $mid =~ s/^<//; |
84 | $mid =~ s/>$//; |
85 | $mid = "<$mid>"; |
86 | } |
87 | |
88 | $ns=$ENV{'NNTPSERVER'}; |
89 | if (!defined $ns or !length $ns) { |
90 | $ns = `cat /etc/nntpserver`; |
91 | } |
92 | $port = (getservbyname("nntp", "tcp"))[2]; |
93 | $ns = inet_aton($ns); |
94 | $proto = getprotobyname("tcp"); |
95 | $paddr = sockaddr_in($port, $ns); |
96 | |
97 | socket(S,PF_INET,SOCK_STREAM,$proto) or die "socket: $!"; |
98 | connect(S,$paddr) or die "connect: $!"; |
99 | |
100 | S->autoflush(1); |
101 | |
102 | &getline; |
103 | $code =~ /^2\d\d/ or die "no initial greeting from server\n"; |
104 | |
105 | &docmd("MODE READER"); |
106 | # some servers require a GROUP before an ARTICLE command |
107 | &docmd("GROUP $group"); |
108 | &docmd("ARTICLE $mid"); |
109 | while (1) { |
110 | &getline; |
111 | s/[\r\n]//g; |
112 | last if /^\.$/; |
113 | s/^\.//; |
114 | print STDOUT "$_\n"; |
115 | } |
116 | &docmd("QUIT"); |
117 | close S; |
118 | |
119 | sub putline { |
120 | my ($line) = @_; |
121 | print STDERR ">>> $line\n" if $verbose; |
122 | print S "$line\r\n"; |
123 | } |
124 | |
125 | sub getline { |
126 | $_ = <S>; |
127 | s/[\r\n]*$//s; |
128 | $code = substr($_,0,3); |
129 | print STDERR "<<< $_\n" if $verbose; |
130 | } |
131 | |
132 | sub docmd { |
133 | my ($cmd) = @_; |
134 | while (1) { |
135 | &putline($cmd); |
136 | &getline; |
137 | if ($code eq "480") { &auth; } else { last; } |
138 | } |
139 | $code =~ /^2\d\d/ or die "failed on `$cmd':\n$_\n"; |
140 | } |
141 | |
142 | sub auth { |
143 | # Authentication. |
144 | if ($ENV{"NNTPAUTH"}) { |
145 | $auth = $ENV{"NNTPAUTH"}; |
146 | &putline("AUTHINFO GENERIC $auth"); |
147 | pipe AUTHSTDIN, TOAUTH or die "unable to create pipes"; |
148 | pipe FROMAUTH, AUTHSTDOUT or die "unable to create pipes"; |
149 | $pid = fork; |
150 | if (!defined $pid) { |
151 | die "unable to fork for authentication helper"; |
152 | } elsif ($pid == 0) { |
153 | # we are child |
154 | $ENV{"NNTP_AUTH_FDS"} = "0.1"; |
155 | open STDIN, "<&AUTHSTDIN"; |
156 | open STDOUT, ">&AUTHSTDOUT"; |
157 | close S; |
158 | exec $auth; |
159 | } |
160 | # we are parent |
161 | close AUTHSTDIN; |
162 | close AUTHSTDOUT; |
163 | autoflush TOAUTH 1; |
164 | &getline; print TOAUTH "$_\n"; |
165 | while (<FROMAUTH>) { |
166 | s/[\r\n]*$//s; |
167 | &putline($_); |
168 | &getline; |
169 | print TOAUTH "$_\n"; |
170 | } |
171 | die "failed authentication\n" unless $? == 0; |
172 | } |
173 | } |