/* id.c - print real and effective user and group IDs * * Copyright 2012 Sony Network Entertainment, Inc. * * by Tim Bird <tim.bird@am.sony.com> * * See http://opengroup.org/onlinepubs/9699919799/utilities/id.html USE_ID(NEWTOY(id, ">1nGgru[!Ggu]", TOYFLAG_BIN)) USE_ID_GROUPS(OLDTOY(groups, id, NULL, TOYFLAG_USR|TOYFLAG_BIN)) config ID bool "id" default y help usage: id [-nGgru] Print user and group ID. -n print names instead of numeric IDs (to be used with -Ggu) -G Show only the group IDs -g Show only the effective group ID -r Show real ID instead of effective ID -u Show only the effective user ID config ID_GROUPS bool "groups" default y depends on ID help usage: groups [user] Print the groups a user is in. */ #define FOR_id #include "toys.h" static void s_or_u(char *s, unsigned u, int done) { if (toys.optflags & FLAG_n) printf("%s", s); else printf("%u", u); if (done) { xputc('\n'); exit(0); } } static void showid(char *header, unsigned u, char *s) { printf("%s%u(%s)", header, u, s); } void do_id(char *username) { int flags, i, ngroups, cmd_groups = toys.which->name[0] == 'g'; struct passwd *pw; struct group *grp; uid_t uid = getuid(), euid = geteuid(); gid_t gid = getgid(), egid = getegid(), *groups; if (cmd_groups) toys.optflags |= FLAG_G | FLAG_n; flags = toys.optflags; // check if a username is given if (username) { pw = xgetpwnam(username); uid = euid = pw->pw_uid; gid = egid = pw->pw_gid; if (cmd_groups) printf("%s : ", pw->pw_name); } i = flags & FLAG_r; pw = xgetpwuid(i ? uid : euid); if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1); grp = xgetgrgid(i ? gid : egid); if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1); if (!(flags & FLAG_G)) { showid("uid=", pw->pw_uid, pw->pw_name); showid(" gid=", grp->gr_gid, grp->gr_name); if (!i) { if (uid != euid) { pw = xgetpwuid(euid); showid(" euid=", pw->pw_uid, pw->pw_name); } if (gid != egid) { grp = xgetgrgid(egid); showid(" egid=", grp->gr_gid, grp->gr_name); } } showid(" groups=", grp->gr_gid, grp->gr_name); } groups = (gid_t *)toybuf; i = sizeof(toybuf)/sizeof(gid_t); ngroups = username ? getgrouplist(username, gid, groups, &i) : getgroups(i, groups); if (0 >= ngroups) perror_exit(0); for (i = 0;;) { if (!(grp = getgrgid(groups[i]))) perror_msg(0); else if (flags & FLAG_G) s_or_u(grp->gr_name, grp->gr_gid, 0); else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name); if (++i >= ngroups) break; xputc(' '); } xputc('\n'); } void id_main(void) { if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++); else do_id(NULL); }