1 /* id.c - print real and effective user and group IDs 2 * 3 * Copyright 2012 Sony Network Entertainment, Inc. 4 * 5 * by Tim Bird <tim.bird (at) am.sony.com> 6 * 7 * See http://opengroup.org/onlinepubs/9699919799/utilities/id.html 8 9 USE_ID(NEWTOY(id, ">1"USE_ID_Z("Z")"nGgru[!"USE_ID_Z("Z")"Ggu]", TOYFLAG_USR|TOYFLAG_BIN)) 10 USE_GROUPS(NEWTOY(groups, NULL, TOYFLAG_USR|TOYFLAG_BIN)) 11 USE_LOGNAME(NEWTOY(logname, ">0", TOYFLAG_USR|TOYFLAG_BIN)) 12 USE_WHOAMI(OLDTOY(whoami, logname, TOYFLAG_USR|TOYFLAG_BIN)) 13 14 config ID 15 bool "id" 16 default y 17 help 18 usage: id [-nGgru] 19 20 Print user and group ID. 21 22 -n print names instead of numeric IDs (to be used with -Ggu) 23 -G Show only the group IDs 24 -g Show only the effective group ID 25 -r Show real ID instead of effective ID 26 -u Show only the effective user ID 27 28 config ID_Z 29 bool 30 default y 31 depends on ID && !TOYBOX_LSM_NONE 32 help 33 usage: id [-Z] 34 35 -Z Show only security context 36 37 config GROUPS 38 bool "groups" 39 default y 40 help 41 usage: groups [user] 42 43 Print the groups a user is in. 44 45 config LOGNAME 46 bool "logname" 47 default y 48 help 49 usage: logname 50 51 Print the current user name. 52 53 config WHOAMI 54 bool "whoami" 55 default y 56 help 57 usage: whoami 58 59 Print the current user name. 60 */ 61 62 #define FOR_id 63 #define FORCE_FLAGS 64 #include "toys.h" 65 66 GLOBALS( 67 int is_groups; 68 ) 69 70 static void s_or_u(char *s, unsigned u, int done) 71 { 72 if (toys.optflags&FLAG_n) printf("%s", s); 73 else printf("%u", u); 74 if (done) { 75 xputc('\n'); 76 xexit(); 77 } 78 } 79 80 static void showid(char *header, unsigned u, char *s) 81 { 82 printf("%s%u(%s)", header, u, s); 83 } 84 85 static void do_id(char *username) 86 { 87 int flags, i, ngroups; 88 struct passwd *pw; 89 struct group *grp; 90 uid_t uid = getuid(), euid = geteuid(); 91 gid_t gid = getgid(), egid = getegid(), *groups; 92 93 flags = toys.optflags; 94 95 // check if a username is given 96 if (username) { 97 pw = xgetpwnam(username); 98 uid = euid = pw->pw_uid; 99 gid = egid = pw->pw_gid; 100 if (TT.is_groups) printf("%s : ", pw->pw_name); 101 } 102 103 i = flags & FLAG_r; 104 pw = xgetpwuid(i ? uid : euid); 105 if (toys.optflags&FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1); 106 107 grp = xgetgrgid(i ? gid : egid); 108 if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1); 109 110 if (!(toys.optflags&(FLAG_G|FLAG_g|FLAG_Z))) { 111 showid("uid=", pw->pw_uid, pw->pw_name); 112 showid(" gid=", grp->gr_gid, grp->gr_name); 113 114 if (!i) { 115 if (uid != euid) { 116 pw = xgetpwuid(euid); 117 showid(" euid=", pw->pw_uid, pw->pw_name); 118 } 119 if (gid != egid) { 120 grp = xgetgrgid(egid); 121 showid(" egid=", grp->gr_gid, grp->gr_name); 122 } 123 } 124 125 showid(" groups=", grp->gr_gid, grp->gr_name); 126 } 127 128 if (!(toys.optflags&FLAG_Z)) { 129 groups = (gid_t *)toybuf; 130 i = sizeof(toybuf)/sizeof(gid_t); 131 ngroups = username ? getgrouplist(username, gid, groups, &i) 132 : getgroups(i, groups); 133 if (ngroups<0) perror_exit(0); 134 135 int show_separator = !(toys.optflags&FLAG_G); 136 for (i = 0; i<ngroups; i++) { 137 if (show_separator) xputc((toys.optflags&FLAG_G) ? ' ' : ','); 138 show_separator = 1; 139 if (!(grp = getgrgid(groups[i]))) perror_msg(0); 140 else if (toys.optflags&FLAG_G) s_or_u(grp->gr_name, grp->gr_gid, 0); 141 else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name); 142 else show_separator = 0; // Because we didn't show anything this time. 143 } 144 if (toys.optflags&FLAG_G) { 145 xputc('\n'); 146 xexit(); 147 } 148 } 149 150 if (!CFG_TOYBOX_LSM_NONE) { 151 if (lsm_enabled()) { 152 char *context = lsm_context(); 153 154 printf(" context=%s"+!!(toys.optflags&FLAG_Z), context); 155 if (CFG_TOYBOX_FREE) free(context); 156 } else if (toys.optflags&FLAG_Z) error_exit("%s disabled", lsm_name()); 157 } 158 159 xputc('\n'); 160 } 161 162 void id_main(void) 163 { 164 if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++); 165 else do_id(NULL); 166 } 167 168 void groups_main(void) 169 { 170 TT.is_groups = 1; 171 toys.optflags = FLAG_G|FLAG_n; 172 id_main(); 173 } 174 175 void logname_main(void) 176 { 177 toys.optflags = FLAG_u|FLAG_n; 178 id_main(); 179 } 180
