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1.1 root 1: ALL command line arguments that are addresses will be !-format:
2: !-format addresses: h1!h2!u
3: means route to host h1, from there to h2, and user u there.
4: a "uucp" as host means the bangs on the right will remain
5: after translation to %@-format.
6:
7: 822-format: @h1,@h2:u%h5%h4@h3
8: means h1!h2!h3!h4!h5!u
9:
10: %@-format addresses: u%h3%h2@h1
11: 822-format without using the source-routing list at the beginning.
12: We understand the full 822-format coming in, but send out
13: only %@-format.
14:
15: remote-from-line: From fpath date remote from sys
16: where fpath, date, and sys are non-whitespace. fpath in !-format
17:
18: local-from-line: From fpath date
19:
20: Unix-mail-format: a remote-from-line followed by message
21:
22: 822-mail-format: group of headers (format "tag: stuff", stuff can go
23: over multiple lines), including at least "From:" and "Date:",
24: then blank line, then message. Addresses in headers are in
25: 822-format.
26:
27: rmail [-#] [-d] to1 to2 ...
28:
29: -# means just print action
30: -d means print rewrite actions
31: to1 to2 etc. are in !-format
32: stdin has Unix-mail-format
33:
34: reads stdin into message structure *mp
35: parses first line as remote-from-line
36: sets mp->sender=sys!fpath (or just fpath, if "remote from ")
37: and mp->date to date
38: if fails, uses "upasname" environment var, else
39: logname of caller, else Liz.Bimmler
40: (the send program is just like rmail, but doesn't expect a first
41: remote-from-line, so mp->sender is upasname or logname of caller)
42: gateway code changes a sender like a!b!c!d!u to c!d!u if
43: a and b are in /usr/lib/upas/equivlist or are equal
44: to the local system, and c is not. Then, if remainder
45: (say c!d!u) is such that rewriting u gives c!d!u, then
46: mp->sender will just be u.
47: mp->replyaddr set to copy of mp->sender, unless there
48: are shell characters in it: then "postmaster"
49: bind(to1, to2, ...) follows rewrite rules (see man 8 upas and
50: man 7 mail). \s in rules replaced by mp->sender.
51: forwarding allowed only if all machines on mp->sender
52: or all machines on dest are in /usr/lib/upas/forwardlist
53: (or if that file doesn't exist)
54: for each bound address, one of:
55: cat it to mbox, with local-from-line (fpath=mp->sender)
56: or pipe message (with remote-from-line, fpath=mp->sender,
57: sys=sysname_read(), changing "^From " to ">From ")
58: to a command
59: or complain about mail (if ontty, report error, else
60: make a message to mp->replyaddr from "postmaster"
61: with appropriate error message
62:
63:
64: fromsmtp [-h host] [-s defaultsender] [-d] to1 to2 ...
65:
66: -d means just print the command that will be piped to, and
67: the standard input that will be given to it
68: if no -h, host is NULL
69: if no -s, defaultsender is NULL
70: to1, to2, ... in !-format (shouldn't have cur host at beginning,
71: unless have upas rewrite rules to handle that)
72: stdin in 822-mail-format
73:
74: starts up
75: /bin/rmail to1 to2 ...
76: calls from822(host, pointer to rmail pipe, defaultsender) to filter the
77: stdin message into Unix-mail-format, and
78: into the rmail command
79:
80: from822(net, file pointer, defsender)
81: stdin in 822-mail-format or Unix-mail-format
82:
83: if first line is "From x y remote from z", then
84: unixfrom=z!x, unixdate=y
85: if it is "From x y" then unixfrom=x, unixdate=y
86: reads header lines (have ':' after only non-whitespace) from stdin
87: from is first non-null in this list:
88: unixfrom, Reply-To:-header', From:-header', Sender:-header',
89: defsender, "unknown"
90: (where header' means the value of the field modified as follows:
91: take first whitespace delimited token or the first thing
92: enclosed in <...>, and convert it to !-format from 822-format,
93: then prepend "net!" if net is non-NULL (i.e., if -h net was
94: given on command line to fromsmtp)
95: date is Date:-header (with juggled field order) or unixdate
96: write remote-from-line, with fpath=from, date=date, sys=""
97: write header lines, in order they were gotten, with no change
98: copy out the rest of stdin
99:
100: tosmtp [-d domain] [-H helohost] [-f] [-n] [-u] [tohost from to1 to2 ...]
101:
102: Pass -d, -H along along to smtp (if no -f)
103: if -f, just act as filter to stdout
104: from, to1, to2 in !-format (with current host, tohost respect.)
105: stdin in Unix-mail-format
106:
107: sender=from, or if from has no ! in it, then sysname_read()!from
108: if not -f, starts up
109: smtp [-d domain] [-H helohost] sender tohost from to1 to2 ...
110: if -u (unixformat) then copy stdin to smtp or stdout
111: else call to822(pointer to smtp pipe or stdout, sender, domain, rcvrs)
112: (where domain is NULL if no -d, and rcvrs is NULL if -n
113: else rcvrs is "to1', to2', ... ton'" and to1' is the
114: conversion of to1 to %@-format, etc.)
115:
116: to822(file pointer, sender, domain, rcvrs)
117: stdin in Unix-mail-format
118: output goes to file pointer
119:
120: read first line, parse as remote-from-line (fpath, date, sys)
121: (exit if couldn't parse as such)
122: read any 822 headers
123: caddr=sender converted to %@-format, with .domain added to end
124: if domain is non-NULL and sender's last component has
125: not '.' in it
126: if there's a From:-header, let faddr be the first token or
127: thing enclosed in <...>. If faddr ends doesn't end in
128: .domain (if domain!=NULL) and faddr isn't the same as caddr,
129: then print "From: caddr" and turn original into >From:
130: else (there's not From:-header)
131: print "From: caddr"
132: [we ignore fpath]
133: if there's no Date:-header, use date from above, juggled order
134: if there's no To:-header and rcvrs is non-NULL, use that
135: write the headers, in original order (perhaps changing From: to >From:)
136: write a newline
137: write rest of stdin
138:
139: smtpqer [-g] [-H helohost] [-d domain] [-u] from tohost to...
140:
141: from, to in !-format
142: stdin in Unix-mail-format
143:
144: unless -g, add HOSTNAME! to from address (HOSTNAME= this host)
145: unless -u, run
146: tosmtp [-H helohost] [-d domain] from tohost to...
147: > /usr/spool/smtpq/x.y.msg (x, y are numbers)
148: (to convert message into 822 format)
149: make a shell script called /usr/spool/smtpq/x.y.sh that:
150: runs smtp [-H helohost] [-d domain] from tohost to...
151: removes files if ok
152: runs returnsmtpmail if no such user or host
153: start runsmtpq to run all shell scripts in spool directory
154:
155: smtp [-H helohost] [-d domain] [-D] sender targethost to1 to2 ...
156:
157: if no -H, use sysname_read() is used for helohost
158: if no -d domain, use 0
159: -D for debugging
160: sender !-format (with cur host)
161: to1, to2, ... in !-format (with targethost)
162: stdin in any format that receiver can understand
163:
164: convert sender to %@-format, adding .domain if it is non-NULL and
165: the last component has no '.'
166: convert to1, to2, ... to %@-format
167: connect to smtp port on targethost
168: sends
169: HELO helohost
170: MAIL FROM:<sender'>
171: RCPT TO:<to1'>
172: RCPT TO:<to2'>
173: ...
174: DATA
175: stdin, adding \r after \n and making . transparent
176: .
177: QUIT
178:
179: smtpd [-d] [-H helohost] [-h thishost]
180:
181: -d sets socket debugging
182: if no -H, use sysname_read()
183: if no -h, NULL
184:
185: listens on smtp port for connections, forking when get one
186: expect send
187: HELO 250 helohost
188: MAIL FROM:<sender> 250 OK
189: RCPT TO:<to1> 250 OK
190: RCPT TO:<to2> 250 OK
191: ...
192: DATA 354 Start mail input; end with .
193: message in 822-format, with hidden dots
194: .
195: message gets put into a tmp file
196: sender and to's should be in 822-format
197: then runs
198: fromsmtp [-s sender] [-h thishost] to1' to2' ... < tmp file
199: and sends either 250 OK or 554 Transaction failed
200: where to1' to2' are gotten from to1 to2 by converting to
201: !-format, with the first machine stripped off
202: (since it should be the local machine)
203: the -s usually appears (unless there's an error parsing MAIL FROM)
204: [MISTAKE? should convert to !-format??]
205: the -h appears if it appeared in command line
206:
207:
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