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authorRob Landley <rob@landley.net>2012-03-12 23:00:28 -0500
committerRob Landley <rob@landley.net>2012-03-12 23:00:28 -0500
commit7fa9a05de2b79efe5e9c10986cbf1cb8f3abc068 (patch)
tree614e76a1a7c9752bcd90e58a2dda7323acf6dc7a /toys/id.c
parentcc0d4ab069d79510c387ffa53ca351a0acb4b61b (diff)
downloadtoybox-7fa9a05de2b79efe5e9c10986cbf1cb8f3abc068.tar.gz
Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
Diffstat (limited to 'toys/id.c')
-rw-r--r--toys/id.c129
1 files changed, 63 insertions, 66 deletions
diff --git a/toys/id.c b/toys/id.c
index 7436a75a..973cda5a 100644
--- a/toys/id.c
+++ b/toys/id.c
@@ -33,90 +33,87 @@ config ID
#define FLAG_r (1<<1)
#define FLAG_u 1
-void pretty_print(struct passwd *pw, struct group *grp, struct group **grps,
- int n)
+static void s_or_u(char *s, unsigned u, int done)
{
- int i = 0;
-
- printf("uid=%u(%s) gid=%u(%s)", pw->pw_uid, pw->pw_name,
- grp->gr_gid, grp->gr_name);
- if (n) printf(" groups=");
- while (i < n) {
- printf("%d(%s)", grps[i]->gr_gid, grps[i]->gr_name);
- if (++i<n) xputc(',');
+ if (toys.optflags & FLAG_n) printf("%s", s);
+ else printf("%u", u);
+ if (done) {
+ xputc('\n');
+ exit(0);
}
- xputc('\n');
+}
+
+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, **grps;
- uid_t uid;
- gid_t gid, *groups;
+ 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 = pw->pw_uid;
- gid = pw->pw_gid;
- } else {
- /* show effective, unless user specifies real */
- if (flags & FLAG_r) {
- uid = getuid();
- gid = getgid();
- } else {
- uid = geteuid();
- gid = getegid();
- }
+ uid = euid = pw->pw_uid;
+ gid = egid = pw->pw_gid;
}
- if (!(pw = getpwuid(uid)) || !(grp = getgrgid(gid)))
- perror_exit(0);
-
- if (flags & FLAG_u) {
- if (flags & FLAG_n) xputs(pw->pw_name);
- else printf("%d\n", pw->pw_uid);
- return;
- }
- if (flags & FLAG_g) {
- if (flags & FLAG_n) xputs(grp->gr_name);
- else printf("%d\n", grp->gr_gid);
- return;
- }
-
- ngroups = sysconf(_SC_NGROUPS_MAX);
- if (ngroups<1) ngroups = 32;
- groups = xmalloc(ngroups * sizeof(gid_t));
- if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) < 0)
- perror_exit(0);
+ i = toys.optflags & FLAG_r;
+ pw = xgetpwuid(i ? uid : euid);
+ if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1);
- grps = xmalloc(ngroups * sizeof(struct group *));
- for (i = 0; i < ngroups; i++) {
- struct group *tmp;
- grps[i] = xmalloc(sizeof(struct group));
- size_t f = sysconf(_SC_GETGR_R_SIZE_MAX);
- char *buf = xmalloc(f);
- if (getgrgid_r(groups[i], grps[i], buf, f, &tmp) < 0 || !tmp) {
- perror_msg(0);
- continue;
- }
- }
-
- if (flags & FLAG_G) {
- for (i = 0; i < ngroups; i++) {
- if (i) xputc(' ');
- if (flags & FLAG_n) printf("%s", grps[i]->gr_name);
- else printf("%d", grps[i]->gr_gid);
+ 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);
+ }
}
- printf("\n");
- return;
+
+ showid(" groups=", grp->gr_gid, grp->gr_name);
}
- pretty_print(pw, grp, grps, ngroups);
- for (i=0; i < ngroups; i++)
- free(grps[i]);
+ 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');
}