diff options
Diffstat (limited to 'src/libsystemd/bus-error.c')
| -rw-r--r-- | src/libsystemd/bus-error.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/src/libsystemd/bus-error.c b/src/libsystemd/bus-error.c new file mode 100644 index 0000000000..c2e41fb016 --- /dev/null +++ b/src/libsystemd/bus-error.c @@ -0,0 +1,504 @@ +/*-*- 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); +} |