diff options
Diffstat (limited to 'utility.c')
| -rw-r--r-- | utility.c | 57 |
1 files changed, 42 insertions, 15 deletions
@@ -783,18 +783,27 @@ extern int parse_mode(const char *s, mode_t * theMode) +#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_PS || defined BB_LS || defined BB_TAR || defined BB_ID - -#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_PS || defined BB_LS || defined BB_TAR - -/* Use this to avoid needing the glibc NSS stuff - * This uses storage buf to hold things. - * */ -uid_t my_getid(const char *filename, char *name, uid_t id) +/* This parses entries in /etc/passwd and /etc/group. This is desirable + * for BusyBox, since we want to avoid using the glibc NSS stuff, which + * increases target size and is often not needed or wanted for embedded + * systems. + * + * /etc/passwd entries look like this: + * root:x:0:0:root:/root:/bin/bash + * and /etc/group entries look like this: + * root:x:0: + * + * This uses buf as storage to hold things. + * + */ +uid_t my_getid(const char *filename, char *name, uid_t id, gid_t *gid) { FILE *file; char *rname, *start, *end, buf[128]; - uid_t rid; + id_t rid; + gid_t rgid = 0; file = fopen(filename, "r"); if (file == NULL) { @@ -806,6 +815,7 @@ uid_t my_getid(const char *filename, char *name, uid_t id) if (buf[0] == '#') continue; + /* username/group name */ start = buf; end = strchr(start, ':'); if (end == NULL) @@ -813,24 +823,32 @@ uid_t my_getid(const char *filename, char *name, uid_t id) *end = '\0'; rname = start; + /* password */ start = end + 1; end = strchr(start, ':'); if (end == NULL) continue; + /* uid in passwd, gid in group */ start = end + 1; rid = (uid_t) strtol(start, &end, 10); if (end == start) continue; + /* gid in passwd */ + start = end + 1; + rgid = (gid_t) strtol(start, &end, 10); + if (name) { if (0 == strcmp(rname, name)) { + if (gid) *gid = rgid; fclose(file); return (rid); } } if (id != -1 && id == rid) { strncpy(name, rname, 8); + if (gid) *gid = rgid; fclose(file); return (TRUE); } @@ -839,30 +857,39 @@ uid_t my_getid(const char *filename, char *name, uid_t id) return (-1); } +/* returns a uid given a username */ uid_t my_getpwnam(char *name) { - return my_getid("/etc/passwd", name, -1); + return my_getid("/etc/passwd", name, -1, NULL); } +/* returns a gid given a group name */ gid_t my_getgrnam(char *name) { - return my_getid("/etc/group", name, -1); + return my_getid("/etc/group", name, -1, NULL); } +/* gets a username given a uid */ void my_getpwuid(char *name, uid_t uid) { - my_getid("/etc/passwd", name, uid); + my_getid("/etc/passwd", name, uid, NULL); } +/* gets a groupname given a gid */ void my_getgrgid(char *group, gid_t gid) { - my_getid("/etc/group", group, gid); + my_getid("/etc/group", group, gid, NULL); } +/* gets a gid given a user name */ +gid_t my_getpwnamegid(char *name) +{ + gid_t gid; + my_getid("/etc/passwd", name, -1, &gid); + return gid; +} -#endif /* BB_CHMOD_CHOWN_CHGRP || BB_PS || BB_LS || BB_TAR */ - - +#endif /* BB_CHMOD_CHOWN_CHGRP || BB_PS || BB_LS || BB_TAR || BB_ID */ #if (defined BB_CHVT) || (defined BB_DEALLOCVT) |