505 lines
14 KiB
C
505 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include "util.h"
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#include "errno-list.h"
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#include "sd-bus.h"
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#include "bus-error.h"
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#define BUS_ERROR_OOM SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_MEMORY, "Out of memory")
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#define BUS_ERROR_FAILED SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FAILED, "Operation failed")
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static int bus_error_name_to_errno(const char *name) {
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const char *p;
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int r;
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const name_error_mapping *m;
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if (!name)
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return EINVAL;
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p = startswith(name, "System.Error.");
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if (p) {
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r = errno_from_name(p);
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if (r <= 0)
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return EIO;
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return r;
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}
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m = bus_error_mapping_lookup(name, strlen(name));
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if (m)
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return m->code;
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return EIO;
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}
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static sd_bus_error errno_to_bus_error_const(int error) {
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if (error < 0)
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error = -error;
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switch (error) {
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case ENOMEM:
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return BUS_ERROR_OOM;
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case EPERM:
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case EACCES:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_ACCESS_DENIED, "Access denied");
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case EINVAL:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid argument");
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case ESRCH:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN, "No such process");
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case ENOENT:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FILE_NOT_FOUND, "File not found");
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case EEXIST:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_FILE_EXISTS, "File exists");
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case ETIMEDOUT:
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case ETIME:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_TIMEOUT, "Timed out");
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case EIO:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_IO_ERROR, "Input/output error");
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case ENETRESET:
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case ECONNABORTED:
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case ECONNRESET:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_DISCONNECTED, "Disconnected");
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case ENOTSUP:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NOT_SUPPORTED, "Not supported");
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case EADDRNOTAVAIL:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_BAD_ADDRESS, "Address not available");
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case ENOBUFS:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_LIMITS_EXCEEDED, "Limits exceeded");
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case EADDRINUSE:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_ADDRESS_IN_USE, "Address in use");
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case EBADMSG:
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return SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Inconsistent message");
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}
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return SD_BUS_ERROR_NULL;
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}
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static int errno_to_bus_error_name_new(int error, char **ret) {
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const char *name;
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char *n;
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if (error < 0)
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error = -error;
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name = errno_to_name(error);
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if (!name)
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return 0;
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n = strappend("System.Error.", name);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 1;
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}
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bool bus_error_is_dirty(sd_bus_error *e) {
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if (!e)
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return false;
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return e->name || e->message || e->_need_free != 0;
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}
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_public_ void sd_bus_error_free(sd_bus_error *e) {
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if (!e)
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return;
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if (e->_need_free > 0) {
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free((void*) e->name);
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free((void*) e->message);
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}
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e->name = e->message = NULL;
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e->_need_free = 0;
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}
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_public_ int sd_bus_error_set(sd_bus_error *e, const char *name, const char *message) {
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if (!name)
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return 0;
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if (!e)
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goto finish;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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e->name = strdup(name);
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if (!e->name) {
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*e = BUS_ERROR_OOM;
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return -ENOMEM;
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}
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if (message)
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e->message = strdup(message);
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e->_need_free = 1;
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finish:
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return -bus_error_name_to_errno(name);
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}
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int bus_error_setfv(sd_bus_error *e, const char *name, const char *format, va_list ap) {
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if (!name)
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return 0;
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if (!e)
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goto finish;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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e->name = strdup(name);
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if (!e->name) {
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*e = BUS_ERROR_OOM;
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return -ENOMEM;
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}
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if (format)
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vasprintf((char**) &e->message, format, ap);
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e->_need_free = 1;
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finish:
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return -bus_error_name_to_errno(name);
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}
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_public_ int sd_bus_error_setf(sd_bus_error *e, const char *name, const char *format, ...) {
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if (format) {
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int r;
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va_list ap;
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va_start(ap, format);
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r = bus_error_setfv(e, name, format, ap);
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va_end(ap);
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return r;
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}
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return sd_bus_error_set(e, name, NULL);
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}
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_public_ int sd_bus_error_copy(sd_bus_error *dest, const sd_bus_error *e) {
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if (!sd_bus_error_is_set(e))
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return 0;
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if (!dest)
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goto finish;
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assert_return(!bus_error_is_dirty(dest), -EINVAL);
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/*
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* _need_free < 0 indicates that the error is temporarily const, needs deep copying
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* _need_free == 0 indicates that the error is perpetually const, needs no deep copying
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* _need_free > 0 indicates that the error is fully dynamic, needs deep copying
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*/
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if (e->_need_free == 0)
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*dest = *e;
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else {
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dest->name = strdup(e->name);
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if (!dest->name) {
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*dest = BUS_ERROR_OOM;
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return -ENOMEM;
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}
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if (e->message)
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dest->message = strdup(e->message);
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dest->_need_free = 1;
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}
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finish:
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return -bus_error_name_to_errno(e->name);
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}
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_public_ int sd_bus_error_set_const(sd_bus_error *e, const char *name, const char *message) {
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if (!name)
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return 0;
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if (!e)
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goto finish;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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*e = SD_BUS_ERROR_MAKE_CONST(name, message);
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finish:
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return -bus_error_name_to_errno(name);
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}
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_public_ int sd_bus_error_is_set(const sd_bus_error *e) {
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if (!e)
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return 0;
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return !!e->name;
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}
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_public_ int sd_bus_error_has_name(const sd_bus_error *e, const char *name) {
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if (!e)
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return 0;
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return streq_ptr(e->name, name);
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}
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_public_ int sd_bus_error_get_errno(const sd_bus_error* e) {
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if (!e)
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return 0;
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if (!e->name)
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return 0;
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return bus_error_name_to_errno(e->name);
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}
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static void bus_error_strerror(sd_bus_error *e, int error) {
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size_t k = 64;
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char *m;
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assert(e);
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for (;;) {
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char *x;
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m = new(char, k);
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if (!m)
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return;
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errno = 0;
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x = strerror_r(error, m, k);
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if (errno == ERANGE || strlen(x) >= k - 1) {
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free(m);
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k *= 2;
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continue;
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}
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if (!x || errno) {
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free(m);
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return;
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}
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if (x == m) {
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if (e->_need_free > 0) {
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/* Error is already dynamic, let's just update the message */
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free((char*) e->message);
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e->message = x;
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} else {
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char *t;
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/* Error was const so far, let's make it dynamic, if we can */
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t = strdup(e->name);
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if (!t) {
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free(m);
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return;
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}
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e->_need_free = 1;
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e->name = t;
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e->message = x;
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}
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} else {
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free(m);
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if (e->_need_free > 0) {
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char *t;
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/* Error is dynamic, let's hence make the message also dynamic */
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t = strdup(x);
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if (!t)
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return;
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free((char*) e->message);
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e->message = t;
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} else {
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/* Error is const, hence we can just override */
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e->message = x;
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}
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}
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return;
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}
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}
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_public_ int sd_bus_error_set_errno(sd_bus_error *e, int error) {
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if (error < 0)
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error = -error;
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if (!e)
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return -error;
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if (error == 0)
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return -error;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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/* First, try a const translation */
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*e = errno_to_bus_error_const(error);
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if (!sd_bus_error_is_set(e)) {
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int k;
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/* If that didn't work, try a dynamic one. */
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k = errno_to_bus_error_name_new(error, (char**) &e->name);
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if (k > 0)
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e->_need_free = 1;
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else if (k < 0) {
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*e = BUS_ERROR_OOM;
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return -error;
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} else
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*e = BUS_ERROR_FAILED;
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}
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/* Now, fill in the message from strerror() if we can */
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bus_error_strerror(e, error);
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return -error;
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}
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int bus_error_set_errnofv(sd_bus_error *e, int error, const char *format, va_list ap) {
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int r;
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if (error < 0)
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error = -error;
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if (!e)
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return -error;
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if (error == 0)
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return 0;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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/* First, try a const translation */
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*e = errno_to_bus_error_const(error);
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if (!sd_bus_error_is_set(e)) {
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int k;
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/* If that didn't work, try a dynamic one */
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k = errno_to_bus_error_name_new(error, (char**) &e->name);
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if (k > 0)
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e->_need_free = 1;
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else if (k < 0) {
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*e = BUS_ERROR_OOM;
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return -ENOMEM;
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} else
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*e = BUS_ERROR_FAILED;
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}
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if (format) {
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char *m;
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/* First, let's try to fill in the supplied message */
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r = vasprintf(&m, format, ap);
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if (r >= 0) {
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if (e->_need_free <= 0) {
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char *t;
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t = strdup(e->name);
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if (t) {
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e->_need_free = 1;
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e->name = t;
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e->message = m;
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return -error;
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}
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free(m);
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} else {
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free((char*) e->message);
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e->message = m;
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return -error;
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}
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}
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}
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/* If that didn't work, use strerror() for the message */
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bus_error_strerror(e, error);
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return -error;
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}
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_public_ int sd_bus_error_set_errnof(sd_bus_error *e, int error, const char *format, ...) {
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int r;
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if (error < 0)
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error = -error;
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if (!e)
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return -error;
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if (error == 0)
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return 0;
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assert_return(!bus_error_is_dirty(e), -EINVAL);
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if (format) {
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va_list ap;
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va_start(ap, format);
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r = bus_error_set_errnofv(e, error, format, ap);
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va_end(ap);
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return r;
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}
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return sd_bus_error_set_errno(e, error);
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}
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const char *bus_error_message(const sd_bus_error *e, int error) {
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if (e) {
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/* Sometimes the D-Bus server is a little bit too verbose with
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* its error messages, so let's override them here */
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if (sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED))
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return "Access denied";
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if (e->message)
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return e->message;
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}
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if (error < 0)
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error = -error;
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return strerror(error);
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}
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