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-rw-r--r--toys/posix/id.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/toys/posix/id.c b/toys/posix/id.c
new file mode 100644
index 00000000..973cda5a
--- /dev/null
+++ b/toys/posix/id.c
@@ -0,0 +1,119 @@
+/* vi: set sw=4 ts=4:
+ *
+ * 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://www.opengroup.org/onlinepubs/009695399/utilities/id.html
+
+USE_ID(NEWTOY(id, "nGgru", 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
+*/
+
+#include "toys.h"
+
+#define FLAG_n (1<<4)
+#define FLAG_G (1<<3)
+#define FLAG_g (1<<2)
+#define FLAG_r (1<<1)
+#define FLAG_u 1
+
+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);
+}
+
+struct passwd *xgetpwuid(uid_t uid)
+{
+ struct passwd *pwd = getpwuid(uid);
+ if (!pwd) error_exit(NULL);
+ return pwd;
+}
+
+struct group *xgetgrgid(gid_t gid)
+{
+ struct group *group = getgrgid(gid);
+ if (!group) error_exit(NULL);
+ return group;
+}
+
+void id_main(void)
+{
+ int flags = toys.optflags, i, ngroups;
+ struct passwd *pw;
+ struct group *grp;
+ uid_t uid = getuid(), euid = geteuid();
+ gid_t gid = getgid(), egid = getegid(), *groups;
+
+ /* check if a username is given */
+ if (*toys.optargs) {
+ if (!(pw = getpwnam(*toys.optargs)))
+ error_exit("no such user '%s'", *toys.optargs);
+ uid = euid = pw->pw_uid;
+ gid = egid = pw->pw_gid;
+ }
+
+ i = toys.optflags & 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;
+ if (0 >= (ngroups = getgroups(sizeof(toybuf)/sizeof(gid_t), groups)))
+ perror_exit(0);
+
+ for (i = 0; i < ngroups; i++) {
+ xputc(' ');
+ 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);
+ }
+ xputc('\n');
+}