diff options
Diffstat (limited to '')
| -rw-r--r-- | src/libsystemd/sd-bus/bus-error.c | 610 |
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; +} |