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[type/__dma] Improve documentation

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This commit is contained in:
Dennis Camera 2020-06-11 17:01:22 +02:00
parent 193b1780de
commit 5513485097
3 changed files with 75 additions and 36 deletions
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8
type/__dma/explorer/conf
View file

@ -17,8 +17,12 @@
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
# This explorer looks for lines matching the server parameter in dma's auth.conf
# and reports the login and server fields (password is cksummed)
# This explorer returns a sorted list of "active" (= non-commented) lines
# in the dma.conf file.
# "Trailing" line comments are stripped off.
#
# NOTE: This explorer assumes that the sort(1) utility supports the non-POXIX
# -s (stable sort) option.
CONF_PATH=/etc/dma # set in Makefile
dma_conf="${CONF_PATH:?}/dma.conf"

96
type/__dma/gencode-remote
View file

@ -20,7 +20,7 @@ else
fi
# Generate config
# Generate "should" values for config
conf_should=$(
if test -s "${__object}/parameter/smarthost"
then
@ -60,7 +60,7 @@ conf_should=$(
if test -s "${__object}/parameter/port"
then
printf 'PORT %u\n' "$(cat "${__object}/parameter/port")"
elif test "${default_smtp_port}" -ne 25
elif test "${default_smtp_port}" -ne 25 # DMA uses port 25 by default
then
printf 'PORT %u\n' "${default_smtp_port}"
fi
@ -93,6 +93,7 @@ conf_should=$(
echo 'NULLCLIENT'
fi
)
# Sort conf_should to compare against "conf_is"
conf_should=$(echo "$conf_should" | sort -s -k 1,1)
config_updated=false
@ -100,24 +101,55 @@ if ! echo "$conf_should" | cmp -s "${__object}/explorer/conf" -
then
# config needs to be updated
echo "dma_conf='${CONF_PATH:?}/dma.conf'"
# The following AWK script will output the new config file to be stored on
# disk. To do so it reads the current dma.conf file and the config options
# that should be set (from stdin).
# Note that the path to the current dma.conf is passed to AWK twice, because
# the new file cannot be generated in one pass.
# The logic tries to place options at a sensible location, that is:
# a) if the option is already used in the config file:
# group all similar options (e.g. MASQUERADE) at one place in the order
# they are listed in stdin.
# b) if it is a new option and a "default comment" (e.g. "#PORT 25") exists:
# place options grouped directly after the comment (the comment is left
# alone)
# c) otherwise:
# options are grouped by word (the first word in the line) and appended
# at the end of the file.
cat <<'EOF'
awk -F '\n' '
function comment_line(line) { return match(line, /^[ \t]*#+[ \t]*/) }
function empty_line(line) { return match(line, /^[ \t]*$/) }
function is_word(s) { return s ~ /^[A-Z_]+$/ }
function comment_line(line) {
# returns the position in line at which the comment's text starts
# (0 if the line is not a comment)
match(line, /^[ \t]*\#+[ \t]*/)
return RSTART ? (RLENGTH + 1) : 0
}
function empty_line(line) { return line ~ /^[ \t]*$/ }
function is_word(s) { return s ~ /^[A-Z_]+$/ } # "looks like a plausible word"
function first(line, sep) {
# returns the part of the line until sep is found
# (or the whole line if sep is not found)
if (!sep) sep = SUBSEP
return index(line, sep) ? substr(line, 1, index(line, sep) - 1) : line
}
function rest(line, sep) {
# returns the part of the line after the first occurrence of sep is found.
# (or nothing if sep is not found)
if (!sep) sep = SUBSEP
if (index(line, sep))
return substr(line, index(line, sep) + 1)
}
function conf_pop(word, value) {
# returns the next value for the config `word` and delete it from the list.
# if value is set, this function will only return value if it is the first
# option in the list, otherwise it returns 0.
if (!(word in conf)) return 0
if (!value) {
if (index(conf[word], SUBSEP)) # more than one element?
@ -137,12 +169,14 @@ function conf_pop(word, value) {
}
function print_conf(word, value) {
# print a config line with the given parameters
printf "%s", word
if (value) printf " %s", value
printf "\n"
}
function print_confs(word, value) {
# print config lines for all values stored in conf[word].
if (!(word in conf)) return
if (conf[word]) {
while (value = conf_pop(word))
@ -154,6 +188,7 @@ function print_confs(word, value) {
}
BEGIN {
# read the "should" state into the `conf` array.
while (getline < "/dev/stdin") {
word = first($0, " ")
if ((word in conf))
@ -163,11 +198,12 @@ BEGIN {
}
}
# first pass, gather information
# first pass, gather information about where which information is stored in the
# current config file. This information will be used in the second pass.
NR == FNR {
if (comment_line($0)) {
# comment line
word = first(substr($0, RLENGTH + 1), " ")
word = first(substr($0, comment_line($0) + 1), " ")
if (is_word(word)) last_occ["#" word] = FNR
} else {
word = first($0, " ")
@ -175,19 +211,22 @@ NR == FNR {
}
}
# before second pass prepare hashes containing location information to be used
# in the second pass.
NR > FNR && FNR == 1 {
# before second pass prepare hashes
# First we drop the locations of commented-out options if a non-commented
# option is available. If a non-commented option is available, we will
# append new config options there to have them all at one place.
for (k in last_occ)
if (k ~ /^\#/ && (substr(k, 2) in last_occ))
delete last_occ[k]
for (k in last_occ) {
line_map[last_occ[k]] = k
}
# Reverse the option => line mapping. The line_map allows for easier lookups
# in the second pass.
for (k in last_occ) line_map[last_occ[k]] = k
}
# second pass, output new config
# second pass, generate and output new config
NR > FNR {
if (comment_line($0) || empty_line($0)) {
# comment or empty line
@ -195,21 +234,24 @@ NR > FNR {
if ((FNR in line_map)) {
if (line_map[FNR] ~ /^\#/) {
# the "matching" comment line is here
# This line contains a commented config option. If the conf hash
# contains options to be set, we output them here because this
# option is not used in the current config.
k = substr(line_map[FNR], 2)
if ((k in conf)) print_confs(k)
}
if (("INSECURE" in conf) && line_map[FNR] ~ /^\#?SECURE$/) {
# INSECURE goes where SECURE comment is
# INSECURE goes where SECURE comment is.
print_confs("INSECURE")
}
}
} else {
sub(/[ \t]*\#.*$/, "", $0) # ignore comments
word = first($0, " ")
value = rest($0, " ")
sub(/[ \t]*\#.*$/, "", value) # ignore comments in value
if ((word in conf) && rest($0, " ") == first(conf[word])) {
if ((word in conf) && value == first(conf[word])) {
# keep config options we want
conf_pop(word)
print
@ -223,12 +265,13 @@ NR > FNR {
}
END {
# print rest of config options
# print rest of config options (
for (word in conf) print_confs(word)
}
' "${dma_conf}" "${dma_conf}" <<'EOF' >"${dma_conf}.tmp" \
&& mv "${dma_conf}.tmp" "${dma_conf}"
EOF
# Pass in "conf_should" via stdin
echo "${conf_should}"
echo 'EOF'
@ -239,20 +282,9 @@ fi
if test -f "${__object}/parameter/send-test-email"
then
modified=false
if grep -q '^__mail_alias/root:' "${__messages_in}"
then
modified=true
elif grep -q '^__dma_auth/' "${__messages_in}"
then
modified=true
elif $config_updated
then
modified=true
fi
if $modified
if grep -q '^__mail_alias/root:' "${__messages_in}" \
|| grep -q '^__dma_auth/' "${__messages_in}" \
|| $config_updated
then
cat <<-EOF
sendmail root <<EOM

7
type/__dma/man.rst
View file

@ -44,9 +44,12 @@ OPTIONAL PARAMETERS
mailname
If present, this will be the hostname used to identify this host and the
remote part of the from addresses.
If not defined, it defaults to `/etc/mailname` on Debian-derived Operating
Systems and to `__target_host` otherwise.
If not defined, it defaults to `/etc/mailname` on Debian derivatives and to
`__target_fqdn` otherwise.
See `dma(8)` for more information.
Note: on Debian derivatives the `/etc/mailname` file should be updated
instead of using this parameter.
masquerade
Masquerade the envelope-from addresses with this address/hostname.
Use this setting if mails are not accepted by destination mail servers