util: generalize is_localhost() and use it everywhere where applicable

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index fe05820395e58d2fcd051ea2ac0beeab177f92ef..ceafa019a83d60c90472e83edeed1a1ae7c13ec7 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -280,6 +280,14 @@ int parse_uid(const char *s, uid_t* ret_uid) {
         if ((unsigned long) uid != ul)
                 return -ERANGE;
 
+        /* Some libc APIs use (uid_t) -1 as special placeholder */
+        if (uid == (uid_t) 0xFFFFFFFF)
+                return -ENXIO;
+
+        /* A long time ago UIDs where 16bit, hence explicitly avoid the 16bit -1 too */
+        if (uid == (uid_t) 0xFFFF)
+                return -ENXIO;
+
         *ret_uid = uid;
         return 0;
 }
@@ -1440,7 +1448,7 @@ _pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) {
 }
 
 int close_all_fds(const int except[], unsigned n_except) {
-        DIR *d;
+        _cleanup_closedir_ DIR *d = NULL;
         struct dirent *de;
         int r = 0;
 
@@ -1495,7 +1503,6 @@ int close_all_fds(const int except[], unsigned n_except) {
                 }
         }
 
-        closedir(d);
         return r;
 }
 
@@ -1514,6 +1521,7 @@ bool fstype_is_network(const char *fstype) {
         static const char table[] =
                 "cifs\0"
                 "smbfs\0"
+                "sshfs\0"
                 "ncpfs\0"
                 "ncp\0"
                 "nfs\0"
@@ -2671,7 +2679,7 @@ finish:
 }
 
 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
-        DIR *d;
+        _cleanup_closedir_ DIR *d = NULL;
         int ret = 0;
 
         assert(fd >= 0);
@@ -2694,15 +2702,12 @@ int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct
 
                 errno = 0;
                 de = readdir(d);
-                if (!de && errno != 0) {
-                        if (ret == 0)
+                if (!de) {
+                        if (errno != 0 && ret == 0)
                                 ret = -errno;
-                        break;
+                        return ret;
                 }
 
-                if (!de)
-                        break;
-
                 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
                         continue;
 
@@ -2758,10 +2763,6 @@ int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct
                         }
                 }
         }
-
-        closedir(d);
-
-        return ret;
 }
 
 _pure_ static int is_temporary_fs(struct statfs *s) {
@@ -3481,6 +3482,17 @@ int wait_for_terminate(pid_t pid, siginfo_t *status) {
         }
 }
 
+/*
+ * Return values:
+ * < 0 : wait_for_terminate() failed to get the state of the
+ *       process, the process was terminated by a signal, or
+ *       failed for an unknown reason.
+ * >=0 : The process terminated normally, and its exit code is
+ *       returned.
+ *
+ * That is, success is indicated by a return value of zero, and an
+ * error is indicated by a non-zero value.
+ */
 int wait_for_terminate_and_warn(const char *name, pid_t pid) {
         int r;
         siginfo_t status;
@@ -3619,9 +3631,6 @@ char *fstab_node_to_udev_node(const char *p) {
 bool tty_is_vc(const char *tty) {
         assert(tty);
 
-        if (startswith(tty, "/dev/"))
-                tty += 5;
-
         return vtnr_from_tty(tty) >= 0;
 }
 
@@ -4145,6 +4154,46 @@ int symlink_atomic(const char *from, const char *to) {
         return 0;
 }
 
+int mknod_atomic(const char *path, mode_t mode, dev_t dev) {
+        _cleanup_free_ char *t = NULL;
+
+        assert(path);
+
+        t = tempfn_random(path);
+        if (!t)
+                return -ENOMEM;
+
+        if (mknod(t, mode, dev) < 0)
+                return -errno;
+
+        if (rename(t, path) < 0) {
+                unlink_noerrno(t);
+                return -errno;
+        }
+
+        return 0;
+}
+
+int mkfifo_atomic(const char *path, mode_t mode) {
+        _cleanup_free_ char *t = NULL;
+
+        assert(path);
+
+        t = tempfn_random(path);
+        if (!t)
+                return -ENOMEM;
+
+        if (mkfifo(t, mode) < 0)
+                return -errno;
+
+        if (rename(t, path) < 0) {
+                unlink_noerrno(t);
+                return -errno;
+        }
+
+        return 0;
+}
+
 bool display_is_local(const char *display) {
         assert(display);
 
@@ -5177,8 +5226,8 @@ int get_home_dir(char **_h) {
         assert(_h);
 
         /* Take the user specified one */
-        e = getenv("HOME");
-        if (e) {
+        e = secure_getenv("HOME");
+        if (e && path_is_absolute(e)) {
                 h = strdup(e);
                 if (!h)
                         return -ENOMEM;
@@ -5646,14 +5695,17 @@ static int search_and_fopen_internal(const char *path, const char *mode, const c
         assert(mode);
         assert(_f);
 
-        if (!path_strv_canonicalize_absolute_uniq(search, root))
+        if (!path_strv_resolve_uniq(search, root))
                 return -ENOMEM;
 
         STRV_FOREACH(i, search) {
                 _cleanup_free_ char *p = NULL;
                 FILE *f;
 
-                p = strjoin(*i, "/", path, NULL);
+                if (root)
+                        p = strjoin(root, *i, "/", path, NULL);
+                else
+                        p = strjoin(*i, "/", path, NULL);
                 if (!p)
                         return -ENOMEM;
 
@@ -6680,3 +6732,18 @@ char *tempfn_random(const char *p) {
 
         return t;
 }
+
+/* make sure the hostname is not "localhost" */
+bool is_localhost(const char *hostname) {
+        assert(hostname);
+
+        /* This tries to identify local hostnames described in RFC6761
+         * plus the redhatism of .localdomain */
+
+        return streq(hostname, "localhost") ||
+               streq(hostname, "localhost.") ||
+               endswith(hostname, ".localhost") ||
+               endswith(hostname, ".localhost.") ||
+               endswith(hostname, ".localdomain") ||
+               endswith(hostname, ".localdomain.");
+}