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Diffstat (limited to 'src/libsystemd/sd-bus/bus-error.c')
-rw-r--r--src/libsystemd/sd-bus/bus-error.c610
1 files changed, 610 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-error.c b/src/libsystemd/sd-bus/bus-error.c
new file mode 100644
index 0000000..dc95237
--- /dev/null
+++ b/src/libsystemd/sd-bus/bus-error.c
@@ -0,0 +1,610 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sd-bus.h"
+
+#include "alloc-util.h"
+#include "bus-error.h"
+#include "errno-list.h"
+#include "string-util.h"
+#include "util.h"
+
+BUS_ERROR_MAP_ELF_REGISTER const sd_bus_error_map bus_standard_errors[] = {
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.Failed", EACCES),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NoMemory", ENOMEM),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.ServiceUnknown", EHOSTUNREACH),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NameHasNoOwner", ENXIO),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NoReply", ETIMEDOUT),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.IOError", EIO),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.BadAddress", EADDRNOTAVAIL),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NotSupported", EOPNOTSUPP),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.LimitsExceeded", ENOBUFS),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.AccessDenied", EACCES),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.AuthFailed", EACCES),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.InteractiveAuthorizationRequired", EACCES),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NoServer", EHOSTDOWN),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.Timeout", ETIMEDOUT),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.NoNetwork", ENONET),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.AddressInUse", EADDRINUSE),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.Disconnected", ECONNRESET),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.InvalidArgs", EINVAL),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.FileNotFound", ENOENT),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.FileExists", EEXIST),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.UnknownMethod", EBADR),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.UnknownObject", EBADR),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.UnknownInterface", EBADR),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.UnknownProperty", EBADR),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.PropertyReadOnly", EROFS),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.UnixProcessIdUnknown", ESRCH),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.InvalidSignature", EINVAL),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.InconsistentMessage", EBADMSG),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.TimedOut", ETIMEDOUT),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.MatchRuleInvalid", EINVAL),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.InvalidFileContent", EINVAL),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.MatchRuleNotFound", ENOENT),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown", ESRCH),
+ SD_BUS_ERROR_MAP("org.freedesktop.DBus.Error.ObjectPathInUse", EBUSY),
+ SD_BUS_ERROR_MAP_END
+};
+
+/* GCC maps this magically to the beginning and end of the BUS_ERROR_MAP section */
+extern const sd_bus_error_map __start_SYSTEMD_BUS_ERROR_MAP[];
+extern const sd_bus_error_map __stop_SYSTEMD_BUS_ERROR_MAP[];
+
+/* Additional maps registered with sd_bus_error_add_map() are in this
+ * NULL terminated array */
+static const sd_bus_error_map **additional_error_maps = NULL;
+
+static int bus_error_name_to_errno(const char *name) {
+ const sd_bus_error_map **map, *m;
+ const char *p;
+ int r;
+
+ if (!name)
+ return EINVAL;
+
+ p = startswith(name, "System.Error.");
+ if (p) {
+ r = errno_from_name(p);
+ if (r < 0)
+ return EIO;
+
+ return r;
+ }
+
+ if (additional_error_maps)
+ for (map = additional_error_maps; *map; map++)
+ for (m = *map;; m++) {
+ /* For additional error maps the end marker is actually the end marker */
+ if (m->code == BUS_ERROR_MAP_END_MARKER)
+ break;
+
+ if (streq(m->name, name))
+ return m->code;
+ }
+
+ m = ALIGN_TO_PTR(__start_SYSTEMD_BUS_ERROR_MAP, sizeof(void*));
+ while (m < __stop_SYSTEMD_BUS_ERROR_MAP) {
+ /* For magic ELF error maps, the end marker might
+ * appear in the middle of things, since multiple maps
+ * might appear in the same section. Hence, let's skip
+ * over it, but realign the pointer to the next 8 byte
+ * boundary, which is the selected alignment for the
+ * arrays. */
+ if (m->code == BUS_ERROR_MAP_END_MARKER) {
+ m = ALIGN_TO_PTR(m + 1, sizeof(void*));
+ continue;
+ }
+
+ if (streq(m->name, name))
+ return m->code;
+
+ m++;
+ }
+
+ return EIO;
+}
+
+static sd_bus_error errno_to_bus_error_const(int error) {
+
+ if (error < 0)
+ error = -error;
+
+ switch (error) {
+
+ case ENOMEM:
+ return BUS_ERROR_OOM;
+
+ case EPERM:
+ case EACCES:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_ACCESS_DENIED, "Access denied");
+
+ case EINVAL:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid argument");
+
+ case ESRCH:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN, "No such process");
+
+ case ENOENT:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FILE_NOT_FOUND, "File not found");
+
+ case EEXIST:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FILE_EXISTS, "File exists");
+
+ case ETIMEDOUT:
+ case ETIME:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_TIMEOUT, "Timed out");
+
+ case EIO:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_IO_ERROR, "Input/output error");
+
+ case ENETRESET:
+ case ECONNABORTED:
+ case ECONNRESET:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_DISCONNECTED, "Disconnected");
+
+ case EOPNOTSUPP:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NOT_SUPPORTED, "Not supported");
+
+ case EADDRNOTAVAIL:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_BAD_ADDRESS, "Address not available");
+
+ case ENOBUFS:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_LIMITS_EXCEEDED, "Limits exceeded");
+
+ case EADDRINUSE:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_ADDRESS_IN_USE, "Address in use");
+
+ case EBADMSG:
+ return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Inconsistent message");
+ }
+
+ return SD_BUS_ERROR_NULL;
+}
+
+static int errno_to_bus_error_name_new(int error, char **ret) {
+ const char *name;
+ char *n;
+
+ if (error < 0)
+ error = -error;
+
+ name = errno_to_name(error);
+ if (!name)
+ return 0;
+
+ n = strappend("System.Error.", name);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 1;
+}
+
+bool bus_error_is_dirty(sd_bus_error *e) {
+ if (!e)
+ return false;
+
+ return e->name || e->message || e->_need_free != 0;
+}
+
+_public_ void sd_bus_error_free(sd_bus_error *e) {
+ if (!e)
+ return;
+
+ if (e->_need_free > 0) {
+ free((void*) e->name);
+ free((void*) e->message);
+ }
+
+ *e = SD_BUS_ERROR_NULL;
+}
+
+_public_ int sd_bus_error_set(sd_bus_error *e, const char *name, const char *message) {
+
+ if (!name)
+ return 0;
+ if (!e)
+ goto finish;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ e->name = strdup(name);
+ if (!e->name) {
+ *e = BUS_ERROR_OOM;
+ return -ENOMEM;
+ }
+
+ if (message)
+ e->message = strdup(message);
+
+ e->_need_free = 1;
+
+finish:
+ return -bus_error_name_to_errno(name);
+}
+
+int bus_error_setfv(sd_bus_error *e, const char *name, const char *format, va_list ap) {
+
+ if (!name)
+ return 0;
+
+ if (e) {
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ e->name = strdup(name);
+ if (!e->name) {
+ *e = BUS_ERROR_OOM;
+ return -ENOMEM;
+ }
+
+ /* If we hit OOM on formatting the pretty message, we ignore
+ * this, since we at least managed to write the error name */
+ if (format)
+ (void) vasprintf((char**) &e->message, format, ap);
+
+ e->_need_free = 1;
+ }
+
+ return -bus_error_name_to_errno(name);
+}
+
+_public_ int sd_bus_error_setf(sd_bus_error *e, const char *name, const char *format, ...) {
+
+ if (format) {
+ int r;
+ va_list ap;
+
+ va_start(ap, format);
+ r = bus_error_setfv(e, name, format, ap);
+ va_end(ap);
+
+ return r;
+ }
+
+ return sd_bus_error_set(e, name, NULL);
+}
+
+_public_ int sd_bus_error_copy(sd_bus_error *dest, const sd_bus_error *e) {
+
+ if (!sd_bus_error_is_set(e))
+ return 0;
+ if (!dest)
+ goto finish;
+
+ assert_return(!bus_error_is_dirty(dest), -EINVAL);
+
+ /*
+ * _need_free < 0 indicates that the error is temporarily const, needs deep copying
+ * _need_free == 0 indicates that the error is perpetually const, needs no deep copying
+ * _need_free > 0 indicates that the error is fully dynamic, needs deep copying
+ */
+
+ if (e->_need_free == 0)
+ *dest = *e;
+ else {
+ dest->name = strdup(e->name);
+ if (!dest->name) {
+ *dest = BUS_ERROR_OOM;
+ return -ENOMEM;
+ }
+
+ if (e->message)
+ dest->message = strdup(e->message);
+
+ dest->_need_free = 1;
+ }
+
+finish:
+ return -bus_error_name_to_errno(e->name);
+}
+
+_public_ int sd_bus_error_move(sd_bus_error *dest, sd_bus_error *e) {
+ int r;
+
+ if (!sd_bus_error_is_set(e)) {
+
+ if (dest)
+ *dest = SD_BUS_ERROR_NULL;
+
+ return 0;
+ }
+
+ r = -bus_error_name_to_errno(e->name);
+
+ if (dest) {
+ *dest = *e;
+ *e = SD_BUS_ERROR_NULL;
+ } else
+ sd_bus_error_free(e);
+
+ return r;
+}
+
+_public_ int sd_bus_error_set_const(sd_bus_error *e, const char *name, const char *message) {
+ if (!name)
+ return 0;
+ if (!e)
+ goto finish;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ *e = SD_BUS_ERROR_MAKE_CONST(name, message);
+
+finish:
+ return -bus_error_name_to_errno(name);
+}
+
+_public_ int sd_bus_error_is_set(const sd_bus_error *e) {
+ if (!e)
+ return 0;
+
+ return !!e->name;
+}
+
+_public_ int sd_bus_error_has_name(const sd_bus_error *e, const char *name) {
+ if (!e)
+ return 0;
+
+ return streq_ptr(e->name, name);
+}
+
+_public_ int sd_bus_error_get_errno(const sd_bus_error* e) {
+ if (!e)
+ return 0;
+
+ if (!e->name)
+ return 0;
+
+ return bus_error_name_to_errno(e->name);
+}
+
+static void bus_error_strerror(sd_bus_error *e, int error) {
+ size_t k = 64;
+ char *m;
+
+ assert(e);
+
+ for (;;) {
+ char *x;
+
+ m = new(char, k);
+ if (!m)
+ return;
+
+ errno = 0;
+ x = strerror_r(error, m, k);
+ if (errno == ERANGE || strlen(x) >= k - 1) {
+ free(m);
+ k *= 2;
+ continue;
+ }
+
+ if (errno) {
+ free(m);
+ return;
+ }
+
+ if (x == m) {
+ if (e->_need_free > 0) {
+ /* Error is already dynamic, let's just update the message */
+ free((char*) e->message);
+ e->message = x;
+
+ } else {
+ char *t;
+ /* Error was const so far, let's make it dynamic, if we can */
+
+ t = strdup(e->name);
+ if (!t) {
+ free(m);
+ return;
+ }
+
+ e->_need_free = 1;
+ e->name = t;
+ e->message = x;
+ }
+ } else {
+ free(m);
+
+ if (e->_need_free > 0) {
+ char *t;
+
+ /* Error is dynamic, let's hence make the message also dynamic */
+ t = strdup(x);
+ if (!t)
+ return;
+
+ free((char*) e->message);
+ e->message = t;
+ } else {
+ /* Error is const, hence we can just override */
+ e->message = x;
+ }
+ }
+
+ return;
+ }
+}
+
+_public_ int sd_bus_error_set_errno(sd_bus_error *e, int error) {
+
+ if (error < 0)
+ error = -error;
+
+ if (!e)
+ return -error;
+ if (error == 0)
+ return -error;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ /* First, try a const translation */
+ *e = errno_to_bus_error_const(error);
+
+ if (!sd_bus_error_is_set(e)) {
+ int k;
+
+ /* If that didn't work, try a dynamic one. */
+
+ k = errno_to_bus_error_name_new(error, (char**) &e->name);
+ if (k > 0)
+ e->_need_free = 1;
+ else if (k < 0) {
+ *e = BUS_ERROR_OOM;
+ return -error;
+ } else
+ *e = BUS_ERROR_FAILED;
+ }
+
+ /* Now, fill in the message from strerror() if we can */
+ bus_error_strerror(e, error);
+ return -error;
+}
+
+_public_ int sd_bus_error_set_errnofv(sd_bus_error *e, int error, const char *format, va_list ap) {
+ PROTECT_ERRNO;
+ int r;
+
+ if (error < 0)
+ error = -error;
+
+ if (!e)
+ return -error;
+ if (error == 0)
+ return 0;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ /* First, try a const translation */
+ *e = errno_to_bus_error_const(error);
+
+ if (!sd_bus_error_is_set(e)) {
+ int k;
+
+ /* If that didn't work, try a dynamic one */
+
+ k = errno_to_bus_error_name_new(error, (char**) &e->name);
+ if (k > 0)
+ e->_need_free = 1;
+ else if (k < 0) {
+ *e = BUS_ERROR_OOM;
+ return -ENOMEM;
+ } else
+ *e = BUS_ERROR_FAILED;
+ }
+
+ if (format) {
+ char *m;
+
+ /* Then, let's try to fill in the supplied message */
+
+ errno = error; /* Make sure that %m resolves to the specified error */
+ r = vasprintf(&m, format, ap);
+ if (r >= 0) {
+
+ if (e->_need_free <= 0) {
+ char *t;
+
+ t = strdup(e->name);
+ if (t) {
+ e->_need_free = 1;
+ e->name = t;
+ e->message = m;
+ return -error;
+ }
+
+ free(m);
+ } else {
+ free((char*) e->message);
+ e->message = m;
+ return -error;
+ }
+ }
+ }
+
+ /* If that didn't work, use strerror() for the message */
+ bus_error_strerror(e, error);
+ return -error;
+}
+
+_public_ int sd_bus_error_set_errnof(sd_bus_error *e, int error, const char *format, ...) {
+ int r;
+
+ if (error < 0)
+ error = -error;
+
+ if (!e)
+ return -error;
+ if (error == 0)
+ return 0;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ if (format) {
+ va_list ap;
+
+ va_start(ap, format);
+ r = sd_bus_error_set_errnofv(e, error, format, ap);
+ va_end(ap);
+
+ return r;
+ }
+
+ return sd_bus_error_set_errno(e, error);
+}
+
+const char *bus_error_message(const sd_bus_error *e, int error) {
+
+ if (e) {
+ /* Sometimes, the D-Bus server is a little bit too verbose with
+ * its error messages, so let's override them here */
+ if (sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED))
+ return "Access denied";
+
+ if (e->message)
+ return e->message;
+ }
+
+ if (error < 0)
+ error = -error;
+
+ return strerror(error);
+}
+
+static bool map_ok(const sd_bus_error_map *map) {
+ for (; map->code != BUS_ERROR_MAP_END_MARKER; map++)
+ if (!map->name || map->code <=0)
+ return false;
+ return true;
+}
+
+_public_ int sd_bus_error_add_map(const sd_bus_error_map *map) {
+ const sd_bus_error_map **maps = NULL;
+ unsigned n = 0;
+
+ assert_return(map, -EINVAL);
+ assert_return(map_ok(map), -EINVAL);
+
+ if (additional_error_maps)
+ for (; additional_error_maps[n] != NULL; n++)
+ if (additional_error_maps[n] == map)
+ return 0;
+
+ maps = reallocarray(additional_error_maps, n + 2, sizeof(struct sd_bus_error_map*));
+ if (!maps)
+ return -ENOMEM;
+
+ maps[n] = map;
+ maps[n+1] = NULL;
+
+ additional_error_maps = maps;
+ return 1;
+}