systemctl: split --help into multiple sections

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 328a1ead922b7e37778e4b93941d09b12f83894f..45b578bd03db2fa9db930bd8bdb7e4cddf6cbcd6 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -54,6 +54,7 @@
 #include <sys/time.h>
 #include <linux/rtc.h>
 #include <glob.h>
+#include <grp.h>
 
 #include "macro.h"
 #include "util.h"
@@ -317,6 +318,26 @@ int parse_pid(const char *s, pid_t* ret_pid) {
         return 0;
 }
 
+int parse_uid(const char *s, uid_t* ret_uid) {
+        unsigned long ul = 0;
+        uid_t uid;
+        int r;
+
+        assert(s);
+        assert(ret_uid);
+
+        if ((r = safe_atolu(s, &ul)) < 0)
+                return r;
+
+        uid = (uid_t) ul;
+
+        if ((unsigned long) uid != ul)
+                return -ERANGE;
+
+        *ret_uid = uid;
+        return 0;
+}
+
 int safe_atou(const char *s, unsigned *ret_u) {
         char *x = NULL;
         unsigned long l;
@@ -5242,28 +5263,31 @@ int socket_from_display(const char *display, char **path) {
 
 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
         struct passwd *p;
-        unsigned long lu;
+        uid_t u;
 
         assert(username);
         assert(*username);
-        assert(uid);
-        assert(gid);
-        assert(home);
 
         /* We enforce some special rules for uid=0: in order to avoid
          * NSS lookups for root we hardcode its data. */
 
         if (streq(*username, "root") || streq(*username, "0")) {
                 *username = "root";
-                *uid = 0;
-                *gid = 0;
-                *home = "/root";
+
+                if (uid)
+                        *uid = 0;
+
+                if (gid)
+                        *gid = 0;
+
+                if (home)
+                        *home = "/root";
                 return 0;
         }
 
-        if (safe_atolu(*username, &lu) >= 0) {
+        if (parse_uid(*username, &u) >= 0) {
                 errno = 0;
-                p = getpwuid((uid_t) lu);
+                p = getpwuid(u);
 
                 /* If there are multiple users with the same id, make
                  * sure to leave $USER to the configured value instead
@@ -5280,9 +5304,53 @@ int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **h
         if (!p)
                 return errno != 0 ? -errno : -ESRCH;
 
-        *uid = p->pw_uid;
-        *gid = p->pw_gid;
-        *home = p->pw_dir;
+        if (uid)
+                *uid = p->pw_uid;
+
+        if (gid)
+                *gid = p->pw_gid;
+
+        if (home)
+                *home = p->pw_dir;
+
+        return 0;
+}
+
+int get_group_creds(const char **groupname, gid_t *gid) {
+        struct group *g;
+        gid_t id;
+
+        assert(groupname);
+
+        /* We enforce some special rules for gid=0: in order to avoid
+         * NSS lookups for root we hardcode its data. */
+
+        if (streq(*groupname, "root") || streq(*groupname, "0")) {
+                *groupname = "root";
+
+                if (gid)
+                        *gid = 0;
+
+                return 0;
+        }
+
+        if (parse_gid(*groupname, &id) >= 0) {
+                errno = 0;
+                g = getgrgid(id);
+
+                if (g)
+                        *groupname = g->gr_name;
+        } else {
+                errno = 0;
+                g = getgrnam(*groupname);
+        }
+
+        if (!g)
+                return errno != 0 ? -errno : -ESRCH;
+
+        if (gid)
+                *gid = g->gr_gid;
+
         return 0;
 }
 
@@ -5357,6 +5425,70 @@ int in_search_path(const char *path, char **search) {
         return r;
 }
 
+int get_files_in_directory(const char *path, char ***list) {
+        DIR *d;
+        int r = 0;
+        unsigned n = 0;
+        char **l = NULL;
+
+        assert(path);
+        assert(list);
+
+        d = opendir(path);
+        for (;;) {
+                struct dirent buffer, *de;
+                int k;
+
+                k = readdir_r(d, &buffer, &de);
+                if (k != 0) {
+                        r = -k;
+                        goto finish;
+                }
+
+                if (!de)
+                        break;
+
+                dirent_ensure_type(d, de);
+
+                if (!dirent_is_file(de))
+                        continue;
+
+                if ((unsigned) r >= n) {
+                        char **t;
+
+                        n = MAX(16, 2*r);
+                        t = realloc(l, sizeof(char*) * n);
+                        if (!t) {
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+
+                        l = t;
+                }
+
+                assert((unsigned) r < n);
+
+                l[r] = strdup(de->d_name);
+                if (!l[r]) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                l[++r] = NULL;
+        }
+
+finish:
+        if (d)
+                closedir(d);
+
+        if (r >= 0)
+                *list = l;
+        else
+                strv_free(l);
+
+        return r;
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",