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Diffstat (limited to 'src/share/common')
-rw-r--r-- | src/share/common | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/share/common b/src/share/common index 97f001a..0a7fe87 100644 --- a/src/share/common +++ b/src/share/common @@ -436,6 +436,28 @@ list_users() { fi } +# take one argument, a service name. in response, print a series of +# lines, each with a unique numeric port number that might be +# associated with that service name. (e.g. in: "https", out: "443") +# if nothing is found, print nothing, and return 0. +# +# return 1 if there was an error in the search somehow +get_port_for_service() { + + [[ "$1" =~ ^[a-z0-9]([a-z0-9-]*[a-z0-9])?$ ]] || \ + failure $(printf "This is not a valid service name: '%s'" "$1") + if type getent &>/dev/null ; then + # for linux and FreeBSD systems (getent returns 2 if not found, 0 on success, 1 or 3 on various failures) + (getent services "$service" || if [ "$?" -eq 2 ] ; then true ; else false; fi) | awk '{ print $2 }' | cut -f1 -d/ | sort -u + elif [ -r /etc/services ] ; then + # fall back to /etc/services for systems that don't have getent (MacOS?) + # FIXME: doesn't handle aliases like "null" (or "http"?), which don't show up at the beginning of the line. + awk $(printf '/^%s[[:space:]]/{ print $2 }' "$1") /etc/services | cut -f1 -d/ | sort -u + else + return 1 + fi +} + # return the path to the home directory of a user get_homedir() { local uname=${1:-`whoami`} |