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From d3706690bf2953cb8e0362253dc68d77989de3be Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Fri, 11 Sep 2015 13:37:59 +0200
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Subject: [PATCH] loginctl: print nontrivial properties in logictl show-*
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Cherry-picked from: 2a998c74028a109d6bd8888951abfa8e25a15fb1
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Resolves: #1260465
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---
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 src/login/loginctl.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++-
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 src/shared/macro.h   |  13 +++++
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 2 files changed, 162 insertions(+), 3 deletions(-)
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diff --git a/src/login/loginctl.c b/src/login/loginctl.c
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index b0eede9a3..6c8a59e7c 100644
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--- a/src/login/loginctl.c
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+++ b/src/login/loginctl.c
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@@ -657,19 +657,165 @@ finish:
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         return r;
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 }
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+static int print_property(const char *name, sd_bus_message *m, const char *contents) {
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+        int r;
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+
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+        assert(name);
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+        assert(m);
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+        assert(contents);
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+
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+        if (arg_property && !strv_find(arg_property, name))
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+                /* skip what we didn't read */
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+                return sd_bus_message_skip(m, contents);
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+
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+        switch (contents[0]) {
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+
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+        case SD_BUS_TYPE_STRUCT_BEGIN:
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+
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+                if (contents[1] == SD_BUS_TYPE_STRING && STR_IN_SET(name, "Display", "Seat", "ActiveSession")) {
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+                        const char *s;
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+
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+                        r = sd_bus_message_read(m, "(so)", &s, NULL);
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+                        if (r < 0)
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+                                return bus_log_parse_error(r);
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+
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+                        if (arg_all || !isempty(s))
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+                                printf("%s=%s\n", name, s);
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+
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+                        return 0;
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+
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+                } else if (contents[1] == SD_BUS_TYPE_UINT32 && streq(name, "User")) {
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+                        uint32_t uid;
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+
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+                        r = sd_bus_message_read(m, "(uo)", &uid, NULL);
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+                        if (r < 0)
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+                                return bus_log_parse_error(r);
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+
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+                        if (UID_IS_INVALID(uid)) {
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+                                log_error("Invalid user ID: " UID_FMT, uid);
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+                                return -EINVAL;
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+                        }
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+
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+                        printf("%s=" UID_FMT "\n", name, uid);
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+
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+                        return 0;
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+                }
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+
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+                break;
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+
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+        case SD_BUS_TYPE_ARRAY:
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+
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+                if (contents[1] == SD_BUS_TYPE_STRUCT_BEGIN && streq(name, "Sessions")) {
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+                        const char *s;
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+                        bool space = false;
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+
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+                        r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(so)");
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+                        if (r < 0)
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+                                return bus_log_parse_error(r);
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+
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+                        printf("%s=", name);
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+
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+                        while ((r = sd_bus_message_read(m, "(so)", &s, NULL)) > 0) {
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+                                printf("%s%s", space ? " " : "", s);
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+                                space = true;
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+                        }
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+
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+                        printf("\n");
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+
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+                        if (r < 0)
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+                                return bus_log_parse_error(r);
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+
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+                        r = sd_bus_message_exit_container(m);
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+                        if (r < 0)
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+                                return bus_log_parse_error(r);
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+
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+                        return 0;
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+                }
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+
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+                break;
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+        }
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+
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+        r = bus_print_property(name, m, arg_all);
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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+        if (r == 0) {
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+                r = sd_bus_message_skip(m, contents);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+
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+                if (arg_all)
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+                        printf("%s=[unprintable]\n", name);
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+        }
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+
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+        return 0;
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+}
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+
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 static int show_properties(sd_bus *bus, const char *path, bool *new_line) {
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+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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+        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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         int r;
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+        assert(bus);
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+        assert(path);
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+        assert(new_line);
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+
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+        r = sd_bus_call_method(
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+                        bus,
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+                        "org.freedesktop.login1",
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+                        path,
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+                        "org.freedesktop.DBus.Properties",
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+                        "GetAll",
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+                        &error,
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+                        &reply,
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+                        "s", "");
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to get properties: %s", bus_error_message(&error, r));
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+
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+        r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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         if (*new_line)
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                 printf("\n");
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         *new_line = true;
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-        r = bus_print_all_properties(bus, "org.freedesktop.login1", path, arg_property, arg_all);
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+        while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
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+                const char *name, *contents;
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+
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+                r = sd_bus_message_read(reply, "s", &name);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+
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+                r = sd_bus_message_peek_type(reply, NULL, &contents);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+
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+                r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+
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+                r = print_property(name, reply, contents);
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+                if (r < 0)
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+                        return r;
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+
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+                r = sd_bus_message_exit_container(reply);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+
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+                r = sd_bus_message_exit_container(reply);
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+                if (r < 0)
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+                        return bus_log_parse_error(r);
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+        }
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         if (r < 0)
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-                log_error_errno(r, "Could not get properties: %m");
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+                return bus_log_parse_error(r);
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-        return r;
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+        r = sd_bus_message_exit_container(reply);
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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+        return 0;
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 }
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 static int show_session(int argc, char *argv[], void *userdata) {
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diff --git a/src/shared/macro.h b/src/shared/macro.h
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index 7f89951d6..9d857dc8d 100644
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--- a/src/shared/macro.h
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+++ b/src/shared/macro.h
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@@ -26,6 +26,7 @@
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 #include <sys/types.h>
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 #include <sys/uio.h>
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 #include <inttypes.h>
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+#include <stdbool.h>
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 #define _printf_(a,b) __attribute__ ((format (printf, a, b)))
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 #define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
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@@ -451,6 +452,18 @@ do {                                                                    \
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 #define GID_INVALID ((gid_t) -1)
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 #define MODE_INVALID ((mode_t) -1)
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+static inline bool UID_IS_INVALID(uid_t uid) {
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+        /* We consider both the old 16bit -1 user and the newer 32bit
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+         * -1 user invalid, since they are or used to be incompatible
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+         * with syscalls such as setresuid() or chown(). */
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+
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+        return uid == (uid_t) ((uint32_t) -1) || uid == (uid_t) ((uint16_t) -1);
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+}
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+
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+static inline bool GID_IS_INVALID(gid_t gid) {
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+        return gid == (gid_t) ((uint32_t) -1) || gid == (gid_t) ((uint16_t) -1);
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+}
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+
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 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
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         static inline void func##p(type *p) {                   \
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                 if (*p)                                         \