/* * id - POSIX.2 user identity * * (INCOMPLETE -- supplementary groups for other users not yet done) * * usage: id [-Ggu] [-nr] [user] * * The default output format looks something like: * uid=xxx(chet) gid=xx groups=aa(aname), bb(bname), cc(cname) */ #include #include #include "bashtypes.h" #include #include #include "bashansi.h" #ifdef HAVE_LIMITS_H # include #else # include #endif #if !defined (HAVE_GETPW_DECLS) extern struct passwd *getpwuid (); #endif extern struct group *getgrgid (); #include "shell.h" #include "builtins.h" #include "stdc.h" #include "common.h" #include "bashgetopt.h" #define ID_ALLGROUPS 0x001 /* -G */ #define ID_GIDONLY 0x002 /* -g */ #define ID_USENAME 0x004 /* -n */ #define ID_USEREAL 0x008 /* -r */ #define ID_USERONLY 0x010 /* -u */ #define ID_FLAGSET(s) ((id_flags & (s)) != 0) static int id_flags; static uid_t ruid, euid; static gid_t rgid, egid; static char *id_user; static int inituser (); static int id_pruser (); static int id_prgrp (); static int id_prgroups (); static int id_prall (); int id_builtin (list) WORD_LIST *list; { int opt; char *user; id_flags = 0; reset_internal_getopt (); while ((opt = internal_getopt (list, "Ggnru")) != -1) { switch (opt) { case 'G': id_flags |= ID_ALLGROUPS; break; case 'g': id_flags |= ID_GIDONLY; break; case 'n': id_flags |= ID_USENAME; break; case 'r': id_flags |= ID_USEREAL; break; case 'u': id_flags |= ID_USERONLY; break; default: builtin_usage (); return (EX_USAGE); } } list = loptend; user = list ? list->word->word : (char *)NULL; /* Check for some invalid option combinations */ opt = ID_FLAGSET (ID_ALLGROUPS) + ID_FLAGSET (ID_GIDONLY) + ID_FLAGSET (ID_USERONLY); if (opt > 1 || (opt == 0 && ((id_flags & (ID_USEREAL|ID_USENAME)) != 0))) { builtin_usage (); return (EX_USAGE); } if (list && list->next) { builtin_usage (); return (EX_USAGE); } if (inituser (user) < 0) return (EXECUTION_FAILURE); opt = 0; if (id_flags & ID_USERONLY) opt += id_pruser ((id_flags & ID_USEREAL) ? ruid : euid); else if (id_flags & ID_GIDONLY) opt += id_prgrp ((id_flags & ID_USEREAL) ? rgid : egid); else if (id_flags & ID_ALLGROUPS) opt += id_prgroups (user); else opt += id_prall (user); putchar ('\n'); fflush (stdout); return (opt == 0 ? EXECUTION_SUCCESS : EXECUTION_FAILURE); } static int inituser (uname) char *uname; { struct passwd *pwd; if (uname) { pwd = getpwnam (uname); if (pwd == 0) { builtin_error ("%s: no such user", uname); return -1; } ruid = euid = pwd->pw_uid; rgid = egid = pwd->pw_gid; } else { ruid = current_user.uid; euid = current_user.euid; rgid = current_user.gid; egid = current_user.egid; } return 0; } /* Print the name or value of user ID UID. */ static int id_pruser (uid) int uid; { struct passwd *pwd = NULL; int r; r = 0; if (id_flags & ID_USENAME) { pwd = getpwuid (uid); if (pwd == NULL) r = 1; } if (pwd) printf ("%s", pwd->pw_name); else printf ("%u", (unsigned) uid); return r; } /* Print the name or value of group ID GID. */ static int id_prgrp (gid) int gid; { struct group *grp = NULL; int r; r = 0; if (id_flags & ID_USENAME) { grp = getgrgid (gid); if (grp == NULL) r = 1; } if (grp) printf ("%s", grp->gr_name); else printf ("%u", (unsigned) gid); return r; } static int id_prgroups (uname) char *uname; { int *glist, ng, i, r; r = 0; id_prgrp (rgid); if (egid != rgid) { putchar (' '); id_prgrp (egid); } if (uname) { builtin_error ("supplementary groups for other users not yet implemented"); glist = (int *)NULL; ng = 0; r = 1; } else glist = get_group_array (&ng); for (i = 0; i < ng; i++) if (glist[i] != rgid && glist[i] != egid) { putchar (' '); id_prgrp (glist[i]); } return r; } static int id_prall (uname) char *uname; { int r, i, ng, *glist; struct passwd *pwd; struct group *grp; r = 0; printf ("uid=%u", (unsigned) ruid); pwd = getpwuid (ruid); if (pwd == NULL) r = 1; else printf ("(%s)", pwd->pw_name); printf (" gid=%u", (unsigned) rgid); grp = getgrgid (rgid); if (grp == NULL) r = 1; else printf ("(%s)", grp->gr_name); if (euid != ruid) { printf (" euid=%u", (unsigned) euid); pwd = getpwuid (euid); if (pwd == NULL) r = 1; else printf ("(%s)", pwd->pw_name); } if (egid != rgid) { printf (" egid=%u", (unsigned) egid); grp = getgrgid (egid); if (grp == NULL) r = 1; else printf ("(%s)", grp->gr_name); } if (uname) { builtin_error ("supplementary groups for other users not yet implemented"); glist = (int *)NULL; ng = 0; r = 1; } else glist = get_group_array (&ng); if (ng > 0) printf (" groups="); for (i = 0; i < ng; i++) { if (i > 0) printf (", "); printf ("%u", (unsigned) glist[i]); grp = getgrgid (glist[i]); if (grp == NULL) r = 1; else printf ("(%s)", grp->gr_name); } return r; } char *id_doc[] = { "return information about user identity", (char *)NULL }; struct builtin id_struct = { "id", id_builtin, BUILTIN_ENABLED, id_doc, "id [user]\n\tid -G [-n] [user]\n\tid -g [-nr] [user]\n\tid -u [-nr] [user]", 0 };