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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) |
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9 | # or: nntpid -a news.group.name (download all available articles) |
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10 | # |
11 | # The name of your news server is obtained from the environment variable |
12 | # NNTPSERVER, or from the file /etc/nntpserver if that's not set. |
13 | # |
14 | # This script supports AUTHINFO GENERIC authentication using the |
15 | # environment variable NNTPAUTH. It will only attempt this if it receives |
16 | # a 480 response from the news server; if your news server isn't paranoid |
17 | # then the script will never need to look at NNTPAUTH. |
18 | |
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19 | # Copyright 2000,2004 Simon Tatham. All rights reserved. |
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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 | " or: nntpid [ -v ] -a <newsgroup>\n" . |
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29 | "where: -v verbose (print interaction with news server)\n" . |
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30 | " -d direct output (don't consider using PAGER)\n" . |
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31 | " -a dump all articles in group to stdout as mbox\n" . |
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32 | " also: nntpid --version report version number\n" . |
33 | " nntpid --help display this help text\n" . |
34 | " nntpid --licence display (MIT) licence text\n"; |
35 | |
36 | $licence = |
37 | "nntpid is copyright 2000,2004 Simon Tatham.\n" . |
38 | "\n" . |
39 | "Permission is hereby granted, free of charge, to any person\n" . |
40 | "obtaining a copy of this software and associated documentation files\n" . |
41 | "(the \"Software\"), to deal in the Software without restriction,\n" . |
42 | "including without limitation the rights to use, copy, modify, merge,\n" . |
43 | "publish, distribute, sublicense, and/or sell copies of the Software,\n" . |
44 | "and to permit persons to whom the Software is furnished to do so,\n" . |
45 | "subject to the following conditions:\n" . |
46 | "\n" . |
47 | "The above copyright notice and this permission notice shall be\n" . |
48 | "included in all copies or substantial portions of the Software.\n" . |
49 | "\n" . |
50 | "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n" . |
51 | "EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n" . |
52 | "MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\n" . |
53 | "NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS\n" . |
54 | "BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN\n" . |
55 | "ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\n" . |
56 | "CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n" . |
57 | "SOFTWARE.\n"; |
58 | |
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59 | $pager = 1; |
60 | $verbose = 0; |
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61 | $all = 0; |
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62 | |
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63 | while ($ARGV[0] =~ /^-(.+)$/) { |
64 | shift @ARGV; |
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65 | $verbose = 1, next if $1 eq "v"; |
66 | $pager = 0, next if $1 eq "d"; |
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67 | $all = 1, next if $1 eq "a"; |
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68 | if ($1 eq "-help") { |
69 | print STDERR $usage; |
70 | exit 0; |
71 | } elsif ($1 eq "-version") { |
72 | if ('$Revision$' =~ /Revision:\s+(\d+)/) { |
73 | print "nntpid revision $1\n"; |
74 | } else { |
75 | print "nntpid: unknown revision\n"; |
76 | } |
77 | exit 0; |
78 | } elsif ($1 eq "-licence" or $1 eq "-license") { |
79 | print $licence; |
80 | exit 0; |
81 | } |
82 | } |
83 | |
84 | die $usage if !defined $ARGV[0]; |
85 | |
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86 | if ($all) { |
87 | $group = $ARGV[0]; |
88 | } elsif (defined $ARGV[1]) { |
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89 | $group = $ARGV[0]; |
90 | $mid = $ARGV[1]; |
91 | } else { |
92 | $group = "misc.misc"; |
93 | $mid = $ARGV[0]; |
94 | $mid =~ s/^<//; |
95 | $mid =~ s/>$//; |
96 | $mid = "<$mid>"; |
97 | } |
98 | |
99 | $ns=$ENV{'NNTPSERVER'}; |
100 | if (!defined $ns or !length $ns) { |
101 | $ns = `cat /etc/nntpserver`; |
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102 | chomp $ns; |
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103 | } |
104 | $port = (getservbyname("nntp", "tcp"))[2]; |
105 | $ns = inet_aton($ns); |
106 | $proto = getprotobyname("tcp"); |
107 | $paddr = sockaddr_in($port, $ns); |
108 | |
109 | socket(S,PF_INET,SOCK_STREAM,$proto) or die "socket: $!"; |
110 | connect(S,$paddr) or die "connect: $!"; |
111 | |
112 | S->autoflush(1); |
113 | |
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114 | $fatal = 1; # most errors need to be fatal |
115 | |
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116 | &getline; |
117 | $code =~ /^2\d\d/ or die "no initial greeting from server\n"; |
118 | |
119 | &docmd("MODE READER"); |
120 | # some servers require a GROUP before an ARTICLE command |
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121 | $numbers = &docmd("GROUP $group"); |
122 | if ($all) { |
123 | @numbers = split / /, $numbers; |
124 | $fatal = 0; # ignore failure to retrieve any given article |
125 | for ($mid = $numbers[1]; $mid <= $numbers[2]; $mid++) { |
126 | $art = &getart($mid); |
127 | $art =~ s/\n(>*From )/\n>$1/gs; |
128 | print "From nntpid ".(localtime)."\n".$art."\n"; |
129 | } |
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130 | } else { |
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131 | $art = &getart($mid); |
132 | &docmd("QUIT"); |
133 | close S; |
134 | |
135 | if ($pager and -t STDOUT) { |
136 | $pagername = $ENV{"PAGER"}; |
137 | $pagername = "more" unless defined $pagername; |
138 | open PAGER, "| $pagername"; |
139 | print PAGER $art; |
140 | close PAGER; |
141 | } else { |
142 | print $art; |
143 | } |
144 | } |
145 | |
146 | sub getart { |
147 | my ($mid) = @_; |
148 | $ret = &docmd("ARTICLE $mid"); |
149 | return undef if !defined $ret; |
150 | $art = ""; |
151 | while (1) { |
152 | &getline; |
153 | s/[\r\n]//g; |
154 | last if /^\.$/; |
155 | s/^\.//; |
156 | $art .= "$_\n"; |
157 | } |
158 | return $art; |
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159 | } |
160 | |
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161 | sub putline { |
162 | my ($line) = @_; |
163 | print STDERR ">>> $line\n" if $verbose; |
164 | print S "$line\r\n"; |
165 | } |
166 | |
167 | sub getline { |
168 | $_ = <S>; |
169 | s/[\r\n]*$//s; |
170 | $code = substr($_,0,3); |
171 | print STDERR "<<< $_\n" if $verbose; |
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172 | return substr($_,4); |
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173 | } |
174 | |
175 | sub docmd { |
176 | my ($cmd) = @_; |
177 | while (1) { |
178 | &putline($cmd); |
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179 | $line = &getline; |
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180 | if ($code eq "480") { &auth; } else { last; } |
181 | } |
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182 | if ($code !~ /^2\d\d/) { |
183 | die "failed on `$cmd':\n$_\n" if $fatal; |
184 | return undef; |
185 | } |
186 | return $line; |
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187 | } |
188 | |
189 | sub auth { |
190 | # Authentication. |
191 | if ($ENV{"NNTPAUTH"}) { |
192 | $auth = $ENV{"NNTPAUTH"}; |
193 | &putline("AUTHINFO GENERIC $auth"); |
194 | pipe AUTHSTDIN, TOAUTH or die "unable to create pipes"; |
195 | pipe FROMAUTH, AUTHSTDOUT or die "unable to create pipes"; |
196 | $pid = fork; |
197 | if (!defined $pid) { |
198 | die "unable to fork for authentication helper"; |
199 | } elsif ($pid == 0) { |
200 | # we are child |
201 | $ENV{"NNTP_AUTH_FDS"} = "0.1"; |
202 | open STDIN, "<&AUTHSTDIN"; |
203 | open STDOUT, ">&AUTHSTDOUT"; |
204 | close S; |
205 | exec $auth; |
206 | } |
207 | # we are parent |
208 | close AUTHSTDIN; |
209 | close AUTHSTDOUT; |
210 | autoflush TOAUTH 1; |
211 | &getline; print TOAUTH "$_\n"; |
212 | while (<FROMAUTH>) { |
213 | s/[\r\n]*$//s; |
214 | &putline($_); |
215 | &getline; |
216 | print TOAUTH "$_\n"; |
217 | } |
218 | die "failed authentication\n" unless $? == 0; |
219 | } |
220 | } |