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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 = |
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26 | "usage: nntpid [ -v ] [ -d ] <message-id>\n" . |
27 | " or: nntpid [ -v ] [ -d ] <newsgroup> <article-number>\n" . |
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28 | "where: -v verbose (print interaction with news server)\n" . |
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29 | " -d direct output (don't consider using PAGER)\n" . |
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30 | " also: nntpid --version report version number\n" . |
31 | " nntpid --help display this help text\n" . |
32 | " nntpid --licence display (MIT) licence text\n"; |
33 | |
34 | $licence = |
35 | "nntpid is copyright 2000,2004 Simon Tatham.\n" . |
36 | "\n" . |
37 | "Permission is hereby granted, free of charge, to any person\n" . |
38 | "obtaining a copy of this software and associated documentation files\n" . |
39 | "(the \"Software\"), to deal in the Software without restriction,\n" . |
40 | "including without limitation the rights to use, copy, modify, merge,\n" . |
41 | "publish, distribute, sublicense, and/or sell copies of the Software,\n" . |
42 | "and to permit persons to whom the Software is furnished to do so,\n" . |
43 | "subject to the following conditions:\n" . |
44 | "\n" . |
45 | "The above copyright notice and this permission notice shall be\n" . |
46 | "included in all copies or substantial portions of the Software.\n" . |
47 | "\n" . |
48 | "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n" . |
49 | "EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n" . |
50 | "MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\n" . |
51 | "NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS\n" . |
52 | "BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN\n" . |
53 | "ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\n" . |
54 | "CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n" . |
55 | "SOFTWARE.\n"; |
56 | |
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57 | $pager = 1; |
58 | $verbose = 0; |
59 | |
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60 | while ($ARGV[0] =~ /^-(.+)$/) { |
61 | shift @ARGV; |
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62 | $verbose = 1, next if $1 eq "v"; |
63 | $pager = 0, next if $1 eq "d"; |
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64 | if ($1 eq "-help") { |
65 | print STDERR $usage; |
66 | exit 0; |
67 | } elsif ($1 eq "-version") { |
68 | if ('$Revision$' =~ /Revision:\s+(\d+)/) { |
69 | print "nntpid revision $1\n"; |
70 | } else { |
71 | print "nntpid: unknown revision\n"; |
72 | } |
73 | exit 0; |
74 | } elsif ($1 eq "-licence" or $1 eq "-license") { |
75 | print $licence; |
76 | exit 0; |
77 | } |
78 | } |
79 | |
80 | die $usage if !defined $ARGV[0]; |
81 | |
82 | if (defined $ARGV[1]) { |
83 | $group = $ARGV[0]; |
84 | $mid = $ARGV[1]; |
85 | } else { |
86 | $group = "misc.misc"; |
87 | $mid = $ARGV[0]; |
88 | $mid =~ s/^<//; |
89 | $mid =~ s/>$//; |
90 | $mid = "<$mid>"; |
91 | } |
92 | |
93 | $ns=$ENV{'NNTPSERVER'}; |
94 | if (!defined $ns or !length $ns) { |
95 | $ns = `cat /etc/nntpserver`; |
96 | } |
97 | $port = (getservbyname("nntp", "tcp"))[2]; |
98 | $ns = inet_aton($ns); |
99 | $proto = getprotobyname("tcp"); |
100 | $paddr = sockaddr_in($port, $ns); |
101 | |
102 | socket(S,PF_INET,SOCK_STREAM,$proto) or die "socket: $!"; |
103 | connect(S,$paddr) or die "connect: $!"; |
104 | |
105 | S->autoflush(1); |
106 | |
107 | &getline; |
108 | $code =~ /^2\d\d/ or die "no initial greeting from server\n"; |
109 | |
110 | &docmd("MODE READER"); |
111 | # some servers require a GROUP before an ARTICLE command |
112 | &docmd("GROUP $group"); |
113 | &docmd("ARTICLE $mid"); |
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114 | $art = ""; |
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115 | while (1) { |
116 | &getline; |
117 | s/[\r\n]//g; |
118 | last if /^\.$/; |
119 | s/^\.//; |
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120 | $art .= "$_\n"; |
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121 | } |
122 | &docmd("QUIT"); |
123 | close S; |
124 | |
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125 | if ($pager and -t STDOUT) { |
126 | $pagername = $ENV{"PAGER"}; |
127 | $pagername = "more" unless defined $pagername; |
128 | open PAGER, "| $pagername"; |
129 | print PAGER $art; |
130 | close PAGER; |
131 | } else { |
132 | print $art; |
133 | } |
134 | |
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135 | sub putline { |
136 | my ($line) = @_; |
137 | print STDERR ">>> $line\n" if $verbose; |
138 | print S "$line\r\n"; |
139 | } |
140 | |
141 | sub getline { |
142 | $_ = <S>; |
143 | s/[\r\n]*$//s; |
144 | $code = substr($_,0,3); |
145 | print STDERR "<<< $_\n" if $verbose; |
146 | } |
147 | |
148 | sub docmd { |
149 | my ($cmd) = @_; |
150 | while (1) { |
151 | &putline($cmd); |
152 | &getline; |
153 | if ($code eq "480") { &auth; } else { last; } |
154 | } |
155 | $code =~ /^2\d\d/ or die "failed on `$cmd':\n$_\n"; |
156 | } |
157 | |
158 | sub auth { |
159 | # Authentication. |
160 | if ($ENV{"NNTPAUTH"}) { |
161 | $auth = $ENV{"NNTPAUTH"}; |
162 | &putline("AUTHINFO GENERIC $auth"); |
163 | pipe AUTHSTDIN, TOAUTH or die "unable to create pipes"; |
164 | pipe FROMAUTH, AUTHSTDOUT or die "unable to create pipes"; |
165 | $pid = fork; |
166 | if (!defined $pid) { |
167 | die "unable to fork for authentication helper"; |
168 | } elsif ($pid == 0) { |
169 | # we are child |
170 | $ENV{"NNTP_AUTH_FDS"} = "0.1"; |
171 | open STDIN, "<&AUTHSTDIN"; |
172 | open STDOUT, ">&AUTHSTDOUT"; |
173 | close S; |
174 | exec $auth; |
175 | } |
176 | # we are parent |
177 | close AUTHSTDIN; |
178 | close AUTHSTDOUT; |
179 | autoflush TOAUTH 1; |
180 | &getline; print TOAUTH "$_\n"; |
181 | while (<FROMAUTH>) { |
182 | s/[\r\n]*$//s; |
183 | &putline($_); |
184 | &getline; |
185 | print TOAUTH "$_\n"; |
186 | } |
187 | die "failed authentication\n" unless $? == 0; |
188 | } |
189 | } |