bus: add basic implementation of a native bus client library

1 files changed, 166 insertions, 0 deletions

diff --git a/src/libsystemd-bus/bus-error.c b/src/libsystemd-bus/bus-error.c
new file mode 100644
index 0000000000..0832022ee9
--- /dev/null
+++ b/src/libsystemd-bus/bus-error.c
@@ -0,0 +1,166 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "util.h"
+
+#include "sd-bus.h"
+#include "bus-error.h"
+
+void sd_bus_error_free(sd_bus_error *e) {
+        if (!e)
+                return;
+
+        if (e->need_free) {
+                free((void*) e->name);
+                free((void*) e->message);
+        }
+
+        e->name = e->message = NULL;
+        e->need_free = false;
+}
+
+int sd_bus_error_set(sd_bus_error *e, const char *name, const char *format, ...) {
+        char *n, *m = NULL;
+        va_list ap;
+        int r;
+
+        if (!e)
+                return 0;
+        if (sd_bus_error_is_set(e))
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+
+        n = strdup(name);
+        if (!n)
+                return -ENOMEM;
+
+        if (format) {
+                va_start(ap, format);
+                r = vasprintf(&m, format, ap);
+                va_end(ap);
+
+                if (r < 0) {
+                        free(n);
+                        return -ENOMEM;
+                }
+        }
+
+        e->name = n;
+        e->message = m;
+        e->need_free = true;
+
+        return 0;
+}
+
+int sd_bus_error_copy(sd_bus_error *dest, const sd_bus_error *e) {
+        if (!dest)
+                return 0;
+        if (sd_bus_error_is_set(dest))
+                return -EINVAL;
+        if (!sd_bus_error_is_set(e))
+                return 0;
+
+        if (e->need_free) {
+                char *x, *y = NULL;
+
+                x = strdup(e->name);
+                if (!x)
+                        return -ENOMEM;
+
+                if (e->message) {
+                        y = strdup(e->message);
+                        if (!y) {
+                                free(x);
+                                return -ENOMEM;
+                        }
+                }
+
+                dest->name = x;
+                dest->message = y;
+                dest->need_free = true;
+        } else
+                *dest = *e;
+
+        return 0;
+}
+
+void sd_bus_error_set_const(sd_bus_error *e, const char *name, const char *message) {
+        if (!e)
+                return;
+        if (sd_bus_error_is_set(e))
+                return;
+
+        e->name = name;
+        e->message = message;
+}
+
+int sd_bus_error_is_set(const sd_bus_error *e) {
+        if (!e)
+                return 0;
+
+        return e->name || e->message || e->need_free;
+}
+
+int sd_bus_error_has_name(const sd_bus_error *e, const char *name) {
+        if (!e)
+                return 0;
+
+        return streq_ptr(e->name, name);
+}
+
+int bus_error_to_errno(const sd_bus_error* e) {
+
+        /* Better replce this with a gperf table */
+
+        if (!e->name)
+                return -EIO;
+
+        if (streq(e->name, "org.freedesktop.DBus.Error.NoMemory"))
+                return -ENOMEM;
+
+        if (streq(e->name, "org.freedesktop.DBus.Error.AuthFailed") ||
+            streq(e->name, "org.freedesktop.DBus.Error.AccessDenied"))
+                return -EPERM;
+
+        return -EIO;
+}
+
+int bus_error_from_errno(sd_bus_error *e, int error) {
+        if (!e)
+                return error;
+
+        if (error == -ENOMEM)
+                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.NoMemory", strerror(-error));
+        else if (error == -EPERM || error == EACCES)
+                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.AccessDenied", strerror(-error));
+        else
+                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.Failed", "Operation failed");
+
+        return error;
+}