timedated: use libsystemd-bus instead of libdbus for bus communication

Among other things this also adds a few things necessary for the change:

- Considerably more powerful error returning APIs in libsystemd-bus

- Adapter for connecting an sd_bus to an sd_event

- As I reworked the PolicyKit logic to the new library I also made it
  asynchronous, so that PolicyKit requests of one user cannot block out
  another user anymore.

- We always use the macro names for common bus error. That way it is
  harder to mistype them since the compiler will notice

1 files changed, 270 insertions, 82 deletions

diff --git a/src/libsystemd-bus/bus-error.c b/src/libsystemd-bus/bus-error.c
index 28fe15467f..c347b101bc 100644
--- a/src/libsystemd-bus/bus-error.c
+++ b/src/libsystemd-bus/bus-error.c
@@ -56,10 +56,9 @@ int sd_bus_error_set(sd_bus_error *e, const char *name, const char *message) {
 
         if (!e)
                 return 0;
-        if (bus_error_is_dirty(e))
-                return -EINVAL;
-        if (!name)
-                return -EINVAL;
+
+        assert_return(!bus_error_is_dirty(e), -EINVAL);
+        assert_return(name, -EINVAL);
 
         n = strdup(name);
         if (!n)
@@ -78,27 +77,22 @@ int sd_bus_error_set(sd_bus_error *e, const char *name, const char *message) {
         return 0;
 }
 
-int sd_bus_error_setf(sd_bus_error *e, const char *name, const char *format, ...) {
+int bus_error_setfv(sd_bus_error *e, const char *name, const char *format, va_list ap) {
         char *n, *m = NULL;
-        va_list ap;
         int r;
 
         if (!e)
                 return 0;
-        if (bus_error_is_dirty(e))
-                return -EINVAL;
-        if (!name)
-                return -EINVAL;
+
+        assert_return(!bus_error_is_dirty(e), -EINVAL);
+        assert_return(name, -EINVAL);
 
         n = strdup(name);
         if (!n)
                 return -ENOMEM;
 
         if (format) {
-                va_start(ap, format);
                 r = vasprintf(&m, format, ap);
-                va_end(ap);
-
                 if (r < 0) {
                         free(n);
                         return -ENOMEM;
@@ -112,16 +106,32 @@ int sd_bus_error_setf(sd_bus_error *e, const char *name, const char *format, ...
         return 0;
 }
 
+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);
+}
+
 int sd_bus_error_copy(sd_bus_error *dest, const sd_bus_error *e) {
         char *x, *y = NULL;
 
         if (!dest)
                 return 0;
-        if (bus_error_is_dirty(dest))
-                return -EINVAL;
         if (!sd_bus_error_is_set(e))
                 return 0;
 
+        assert_return(!bus_error_is_dirty(dest), -EINVAL);
+
         x = strdup(e->name);
         if (!x)
                 return -ENOMEM;
@@ -140,13 +150,15 @@ int sd_bus_error_copy(sd_bus_error *dest, const sd_bus_error *e) {
         return 0;
 }
 
-void sd_bus_error_set_const(sd_bus_error *e, const char *name, const char *message) {
+int sd_bus_error_set_const(sd_bus_error *e, const char *name, const char *message) {
         if (!e)
-                return;
-        if (bus_error_is_dirty(e))
-                return;
+                return 0;
+
+        assert_return(!bus_error_is_dirty(e), -EINVAL);
+        assert_return(name, -EINVAL);
 
         *e = SD_BUS_ERROR_MAKE(name, message);
+        return 0;
 }
 
 int sd_bus_error_is_set(const sd_bus_error *e) {
@@ -163,106 +175,282 @@ int sd_bus_error_has_name(const sd_bus_error *e, const char *name) {
         return streq_ptr(e->name, name);
 }
 
-int bus_error_to_errno(const sd_bus_error* e) {
+int sd_bus_error_get_errno(const sd_bus_error* e) {
 
         /* Better replce this with a gperf table */
 
         if (!e)
-                return -EIO;
+                return EIO;
 
         if (!e->name)
-                return -EIO;
+                return EIO;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.NoMemory"))
-                return -ENOMEM;
+        if (streq(e->name, SD_BUS_ERROR_NO_MEMORY))
+                return ENOMEM;
+
+        if (streq(e->name, SD_BUS_ERROR_SERVICE_UNKNOWN))
+                return EHOSTUNREACH;
+
+        if (streq(e->name, SD_BUS_ERROR_NAME_HAS_NO_OWNER))
+                return ENXIO;
+
+        if (streq(e->name, SD_BUS_ERROR_NO_REPLY) ||
+            streq(e->name, SD_BUS_ERROR_TIMEOUT) ||
+            streq(e->name, "org.freedesktop.DBus.Error.TimedOut"))
+                return ETIMEDOUT;
+
+        if (streq(e->name, SD_BUS_ERROR_IO_ERROR))
+                return EIO;
+
+        if (streq(e->name, SD_BUS_ERROR_BAD_ADDRESS))
+                return EADDRNOTAVAIL;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.AuthFailed") ||
-            streq(e->name, "org.freedesktop.DBus.Error.AccessDenied"))
-                return -EPERM;
+        if (streq(e->name, SD_BUS_ERROR_NOT_SUPPORTED))
+                return ENOTSUP;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.InvalidArgs"))
-                return -EINVAL;
+        if (streq(e->name, SD_BUS_ERROR_LIMITS_EXCEEDED))
+                return ENOBUFS;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.UnixProcessIdUnknown"))
-                return -ESRCH;
+        if (streq(e->name, SD_BUS_ERROR_ACCESS_DENIED) ||
+            streq(e->name, SD_BUS_ERROR_AUTH_FAILED))
+                return EACCES;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.FileNotFound"))
-                return -ENOENT;
+        if (streq(e->name, SD_BUS_ERROR_NO_SERVER))
+                return EHOSTDOWN;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.FileExists"))
-                return -EEXIST;
+        if (streq(e->name, SD_BUS_ERROR_NO_NETWORK))
+                return ENONET;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.Timeout"))
-                return -ETIMEDOUT;
+        if (streq(e->name, SD_BUS_ERROR_ADDRESS_IN_USE))
+                return EADDRINUSE;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.IOError"))
-                return -EIO;
+        if (streq(e->name, SD_BUS_ERROR_DISCONNECTED))
+                return ECONNRESET;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.Disconnected"))
-                return -ECONNRESET;
+        if (streq(e->name, SD_BUS_ERROR_INVALID_ARGS) ||
+            streq(e->name, SD_BUS_ERROR_INVALID_SIGNATURE) ||
+            streq(e->name, "org.freedesktop.DBus.Error.MatchRuleInvalid") ||
+            streq(e->name, "org.freedesktop.DBus.Error.InvalidFileContent"))
+                return EINVAL;
 
-        if (streq(e->name, "org.freedesktop.DBus.Error.NotSupported"))
-                return -ENOTSUP;
+        if (streq(e->name, SD_BUS_ERROR_FILE_NOT_FOUND) ||
+            streq(e->name, "org.freedesktop.DBus.Error.MatchRuleNotFound"))
+                return ENOENT;
 
-        return -EIO;
+        if (streq(e->name, SD_BUS_ERROR_FILE_EXISTS))
+                return EEXIST;
+
+        if (streq(e->name, SD_BUS_ERROR_UNKNOWN_METHOD) ||
+            streq(e->name, SD_BUS_ERROR_UNKNOWN_OBJECT) ||
+            streq(e->name, SD_BUS_ERROR_UNKNOWN_INTERFACE) ||
+            streq(e->name, SD_BUS_ERROR_UNKNOWN_PROPERTY))
+                return EBADR;
+
+        if (streq(e->name, SD_BUS_ERROR_PROPERTY_READ_ONLY))
+                return EROFS;
+
+        if (streq(e->name, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN) ||
+            streq(e->name, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
+                return ESRCH;
+
+        if (streq(e->name, SD_BUS_ERROR_INCONSISTENT_MESSAGE))
+                return EBADMSG;
+
+        if (streq(e->name, "org.freedesktop.DBus.Error.ObjectPathInUse"))
+                return EBUSY;
+
+        return EIO;
 }
 
-int bus_error_from_errno(sd_bus_error *e, int error) {
+static int bus_error_set_strerror_or_const(sd_bus_error *e, const char *name, int error, const char *fallback) {
+        size_t k = 64;
+        char *n = NULL, *m = NULL;
+
+        if (error < 0)
+                error = -error;
+
         if (!e)
-                return error;
+                return -error;
 
-        switch (error) {
+        assert_return(!bus_error_is_dirty(e), -EINVAL);
+        assert_return(name, -EINVAL);
 
-        case -ENOMEM:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.NoMemory", "Out of memory");
-                break;
+        for (;;) {
+                char *x;
 
-        case -EPERM:
-        case -EACCES:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.AccessDenied", "Access denied");
-                break;
+                m = new(char, k);
+                if (!m)
+                        goto use_fallback;
+
+                errno = 0;
+                x = strerror_r(error, m, k);
+                if (errno == ERANGE || strlen(x) >= k - 1) {
+                        free(m);
+                        k *= 2;
+                        continue;
+                }
 
-        case -EINVAL:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.InvalidArgs", "Invalid argument");
-                break;
+                if (!x || errno) {
+                        free(m);
+                        goto use_fallback;
+                }
 
-        case -ESRCH:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.UnixProcessIdUnknown", "No such process");
-                break;
 
-        case -ENOENT:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.FileNotFound", "File not found");
-                break;
+                if (x != m) {
+                        free(m);
+                        sd_bus_error_set_const(e, name, x);
+                        return -error;
+                }
 
-        case -EEXIST:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.FileExists", "File exists");
                 break;
+        }
 
-        case -ETIMEDOUT:
-        case -ETIME:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.Timeout", "Timed out");
-                break;
 
-        case -EIO:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.IOError", "Input/output error");
-                break;
+        n = strdup(name);
+        if (!n) {
+                free(m);
+                goto use_fallback;
+        }
 
-        case -ENETRESET:
-        case -ECONNABORTED:
-        case -ECONNRESET:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.Disconnected", "Disconnected");
-                break;
+        e->name = n;
+        e->message = m;
+        e->need_free = true;
 
-        case -ENOTSUP:
-                sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.NotSupported", "Not supported");
-                break;
+        return -error;
+
+use_fallback:
+        sd_bus_error_set_const(e, name, fallback);
+        return -error;
+}
+
+static sd_bus_error map_from_errno(int error) {
+
+        if (error < 0)
+                error = -error;
+
+        switch (error) {
+
+        case ENOMEM:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_NO_NETWORK, "Out of memory");
+
+        case EPERM:
+        case EACCES:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_ACCESS_DENIED, "Access denied");
+
+        case EINVAL:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_INVALID_ARGS, "Invalid argument");
+
+        case ESRCH:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN, "No such process");
+
+        case ENOENT:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_FILE_NOT_FOUND, "File not found");
+
+        case EEXIST:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_FILE_EXISTS, "File exists");
+
+        case ETIMEDOUT:
+        case ETIME:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_TIMEOUT, "Timed out");
+
+        case EIO:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_IO_ERROR, "Input/output error");
+
+        case ENETRESET:
+        case ECONNABORTED:
+        case ECONNRESET:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_DISCONNECTED, "Disconnected");
+
+        case ENOTSUP:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_NOT_SUPPORTED, "Not supported");
+
+        case EADDRNOTAVAIL:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_BAD_ADDRESS, "Address not available");
+
+        case ENOBUFS:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_LIMITS_EXCEEDED, "Limits exceeded");
+
+        case EADDRINUSE:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_ADDRESS_IN_USE, "Address in use");
+
+        case EBADMSG:
+                return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Inconsistent message");
+        }
+
+        return SD_BUS_ERROR_MAKE(SD_BUS_ERROR_FAILED, "Operation failed");
+}
+
+int sd_bus_error_set_errno(sd_bus_error *e, int error) {
+        sd_bus_error x;
+
+        x = map_from_errno(error);
+
+        return bus_error_set_strerror_or_const(e, x.name, error, x.message);
+}
+
+int bus_error_set_errnofv(sd_bus_error *e, int error, const char *format, va_list ap) {
+        sd_bus_error x;
+        int r;
+
+        if (error < 0)
+                error = -error;
+
+        if (!e)
+                return 0;
+
+        assert_return(!bus_error_is_dirty(e), -EINVAL);
+
+        x = map_from_errno(error);
+
+        if (format) {
+                char *n, *m;
+
+                r = vasprintf(&m, format, ap);
+                if (r < 0)
+                        goto fallback;
+
+                n = strdup(x.name);
+                if (!n) {
+                        free(m);
+                        goto fallback;
+                }
+
+                e->name = n;
+                e->message = m;
+                e->need_free = true;
+                return -error;
         }
 
-        sd_bus_error_set_const(e, "org.freedesktop.DBus.Error.Failed", "Operation failed");
-        return error;
+fallback:
+        return bus_error_set_strerror_or_const(e, x.name, error, x.message);
+}
+
+int sd_bus_error_set_errnof(sd_bus_error *e, int error, const char *format, ...) {
+        int r;
+
+        if (!e)
+                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 (error < 0)
+                error = -error;
+
         if (e && e->message)
                 return e->message;