diff options
Diffstat (limited to 'libpwdgrp/uidgid_get.c')
| -rw-r--r-- | libpwdgrp/uidgid_get.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libpwdgrp/uidgid_get.c b/libpwdgrp/uidgid_get.c index 69c228e..f10b406 100644 --- a/libpwdgrp/uidgid_get.c +++ b/libpwdgrp/uidgid_get.c @@ -27,6 +27,7 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include "busybox.h" +/* Always sets uid and gid */ int get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok) { struct passwd *pwd; @@ -53,6 +54,7 @@ int get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok) goto skip; } } + /* Either it is not numeric, or caller disallows numeric username */ pwd = getpwnam(user); if (!pwd) return 0; @@ -75,6 +77,40 @@ int get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok) return 1; } +/* chown-like: + * "user" sets uid only, + * ":group" sets gid only + * "user:" sets uid and gid (to user's primary group id) + * "user:group" sets uid and gid + * ('unset' uid or gid is actually set to -1) + */ +void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group) +{ + char *group; + + u->uid = -1; + u->gid = -1; + + /* Check if there is a group name */ + group = strchr(user_group, '.'); /* deprecated? */ + if (!group) + group = strchr(user_group, ':'); + else + *group = ':'; /* replace '.' with ':' */ + + /* Parse "user[:[group]]" */ + if (!group) { /* "user" */ + u->uid = get_ug_id(user_group, xuname2uid); + } else if (group == user_group) { /* ":group" */ + u->gid = get_ug_id(group + 1, xgroup2gid); + } else { + if (!group[1]) /* "user:" */ + *group = '\0'; + if (!get_uidgid(u, user_group, 1)) + bb_error_msg_and_die("unknown user/group %s", user_group); + } +} + #if 0 #include <stdio.h> int main() |