--- /dev/null
+/*-*- 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 "errno-list.h"
+
+#include "sd-bus.h"
+#include "bus-error.h"
+
+#define BUS_ERROR_OOM SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_MEMORY, "Out of memory")
+#define BUS_ERROR_FAILED SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FAILED, "Operation failed")
+
+static int bus_error_name_to_errno(const char *name) {
+ const char *p;
+ int r;
+ const name_error_mapping *m;
+
+ if (!name)
+ return EINVAL;
+
+ p = startswith(name, "System.Error.");
+ if (p) {
+ r = errno_from_name(p);
+ if (r <= 0)
+ return EIO;
+
+ return r;
+ }
+
+ m = bus_error_mapping_lookup(name, strlen(name));
+ if (m)
+ return m->code;
+
+ 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 ENOTSUP:
+ 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->name = e->message = NULL;
+ e->_need_free = 0;
+}
+
+_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)
+ goto finish;
+
+ assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+ e->name = strdup(name);
+ if (!e->name) {
+ *e = BUS_ERROR_OOM;
+ return -ENOMEM;
+ }
+
+ if (format)
+ vasprintf((char**) &e->message, format, ap);
+
+ e->_need_free = 1;
+
+finish:
+ 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_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 (!x || 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;
+}
+
+int bus_error_set_errnofv(sd_bus_error *e, int error, const char *format, va_list ap) {
+ 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;
+
+ /* First, let's try to fill in the supplied message */
+
+ 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 = 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);
+}
~ianmdlvl / elogind.git / blobdiff