1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-transport-kdbus.c kdbus subclasses of DBusTransport
4 * Copyright (C) 2002, 2003, 2004, 2006 Red Hat Inc
5 * Copyright (C) 2013 Samsung Electronics
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version and under the terms of the GNU
13 * Lesser General Public License as published by the
14 * Free Software Foundation; either version 2.1 of the License, or (at
15 * your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "dbus-transport.h"
28 #include "dbus-transport-kdbus.h"
29 #include "dbus-transport-protected.h"
30 #include "dbus-connection-internal.h"
32 #include "dbus-watch.h"
33 #include "dbus-errors.h"
35 #include "kdbus-common.h"
36 #include <linux/types.h>
40 #include <sys/ioctl.h>
50 * @defgroup DBusTransportKdbus DBusTransport implementations for kdbus
51 * @ingroup DBusInternals
52 * @brief Implementation details of DBusTransport on kdbus
57 /** Size of the memory area for received non-memfd messages. */
58 #define RECEIVE_POOL_SIZE (10 * 1024LU * 1024LU)
60 /** Over this memfd is used to send (if it is not broadcast). */
61 #define MEMFD_SIZE_THRESHOLD (2 * 1024 * 1024LU)
63 /** Define max bytes read or written in one iteration.
64 * This is to avoid blocking on reading or writing for too long. It is checked after each message is sent or received,
65 * so if message is bigger than MAX_BYTES_PER_ITERATION it will be handled in one iteration, but sending/writing
66 * will break after that message.
68 #define MAX_BYTES_PER_ITERATION 16384
70 #if (MEMFD_SIZE_THRESHOLD > KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE)
71 #error Memfd size threshold higher than max kdbus message payload vector size
74 /** Enables verbosing more information about kdbus message.
75 * Works only if DBUS_VERBOSE=1 is used.
77 #define KDBUS_MSG_DECODE_DEBUG 0
79 #define ITER_APPEND_STR(string) \
80 if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &string)) \
86 #define MSG_ITEM_BUILD_VEC(data, datasize) \
87 item->type = KDBUS_MSG_PAYLOAD_VEC; \
88 item->size = KDBUS_PART_HEADER_SIZE + sizeof(struct kdbus_vec); \
89 item->vec.address = (unsigned long) data; \
90 item->vec.size = datasize;
92 #define KDBUS_PART_FOREACH(part, head, first) \
93 for (part = (head)->first; \
94 (uint8_t *)(part) < (uint8_t *)(head) + (head)->size; \
95 part = KDBUS_PART_NEXT(part))
98 * Opaque object representing a transport.
100 typedef struct DBusTransportKdbus DBusTransportKdbus;
103 * Implementation details of DBusTransportKdbus. All members are private.
105 struct DBusTransportKdbus
107 DBusTransport base; /**< Parent instance */
108 int fd; /**< File descriptor. */
109 DBusWatch *read_watch; /**< Watch for readability. */
110 DBusWatch *write_watch; /**< Watch for writability. */
112 int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
113 int max_bytes_written_per_iteration; /**< To avoid blocking too long. */
115 void* kdbus_mmap_ptr; /**< Mapped memory where kdbus (kernel) writes
116 * messages incoming to us.
118 int memfd; /**< File descriptor to special
119 * memory pool for bulk data
120 * transfer. Retrieved from
121 * Kdbus kernel module.
123 __u64 bloom_size; /**< bloom filter field size */
124 char* sender; /**< unique name of the sender */
128 * Gets size in bytes of bloom filter field.
129 * This size is got from the bus during connection procedure.
130 * @param transport transport
131 * @returns size of bloom
133 __u64 dbus_transport_get_bloom_size(DBusTransport* transport)
135 return ((DBusTransportKdbus*)transport)->bloom_size;
139 * Puts locally generated message into received messages queue
140 * @param message message that will be added
141 * @param connection connection to which message will be added
142 * @returns TRUE on success, FALSE on memory allocation error
144 static dbus_bool_t add_message_to_received(DBusMessage *message, DBusConnection* connection)
146 DBusList *message_link;
148 message_link = _dbus_list_alloc_link (message);
149 if (message_link == NULL)
151 dbus_message_unref (message);
155 _dbus_connection_queue_synthesized_message_link(connection, message_link);
161 * Generates local error message as a reply to message given as parameter
162 * and adds generated error message to received messages queue.
163 * @param error_type type of error, preferably DBUS_ERROR_(...)
164 * @param template Template of error description. It can has formatting
165 * characters to print object string into it. Can be NULL.
166 * @param object String to print into error description. Can be NULL.
167 * If object is not NULL while template is NULL, the object string
168 * will be the only error description.
169 * @param message Message for which the error reply is generated.
170 * @param connection The connection.
171 * @returns 0 on success, otherwise -1
173 static int reply_with_error(char* error_type, const char* template, const char* object, DBusMessage *message, DBusConnection* connection)
175 DBusMessage *errMessage;
176 char* error_msg = "";
180 error_msg = alloca(strlen(template) + strlen(object));
181 sprintf(error_msg, template, object);
184 error_msg = (char*)object;
186 errMessage = generate_local_error_message(dbus_message_get_serial(message), error_type, error_msg);
187 if(errMessage == NULL)
189 if (add_message_to_received(errMessage, connection))
196 * Generates reply to the message given as a parameter with one item in the reply body
197 * and adds generated reply message to received messages queue.
198 * @param message The message we are replying to.
199 * @param data_type Type of data sent in the reply.Use DBUS_TYPE_(...)
200 * @param pData Address of data sent in the reply.
201 * @param connection The connection
202 * @returns 0 on success, otherwise -1
204 static int reply_1_data(DBusMessage *message, int data_type, void* pData, DBusConnection* connection)
206 DBusMessageIter args;
209 reply = dbus_message_new_method_return(message);
212 dbus_message_set_sender(reply, DBUS_SERVICE_DBUS);
213 dbus_message_iter_init_append(reply, &args);
214 if (!dbus_message_iter_append_basic(&args, data_type, pData))
216 dbus_message_unref(reply);
219 if(add_message_to_received(reply, connection))
226 static int reply_ack(DBusMessage *message, DBusConnection* connection)
230 reply = dbus_message_new_method_return(message);
233 if(add_message_to_received(reply, connection))
239 * Retrieves file descriptor to memory pool from kdbus module and stores
240 * it in kdbus_transport->memfd. It is then used to send large message.
241 * Triggered when message payload is over MEMFD_SIZE_THRESHOLD
242 * @param kdbus_transport DBusTransportKdbus transport structure
243 * @returns 0 on success, otherwise -1
245 static int kdbus_init_memfd(DBusTransportKdbus* kdbus_transport)
249 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MEMFD_NEW, &memfd) < 0) {
250 _dbus_verbose("KDBUS_CMD_MEMFD_NEW failed: \n");
254 kdbus_transport->memfd = memfd;
255 _dbus_verbose("kdbus_init_memfd: %d!!\n", kdbus_transport->memfd);
260 * Allocates and initializes kdbus message structure.
261 * @param name Well-known name or NULL. If NULL, dst_id must be supplied.
262 * @param dst_id Numeric id of recipient. Ignored if name is not NULL.
263 * @param body_size Size of message body (May be 0).
264 * @param use_memfd Flag to build memfd message.
265 * @param fds_count Number of file descriptors sent in the message.
266 * @param transport transport
267 * @returns initialized kdbus message or NULL if malloc failed
269 static struct kdbus_msg* kdbus_init_msg(const char* name, __u64 dst_id, uint64_t body_size, dbus_bool_t use_memfd, int fds_count, DBusTransportKdbus *transport)
271 struct kdbus_msg* msg;
274 msg_size = sizeof(struct kdbus_msg);
276 if(use_memfd == TRUE) // bulk data - memfd
277 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_memfd));
280 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec)); //header is a must
281 while(body_size > KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE)
283 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec));
284 body_size -= KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
287 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec));
291 msg_size += KDBUS_ITEM_SIZE(sizeof(int)*fds_count);
294 msg_size += KDBUS_ITEM_SIZE(strlen(name) + 1);
295 else if (dst_id == KDBUS_DST_ID_BROADCAST)
296 msg_size += KDBUS_PART_HEADER_SIZE + transport->bloom_size;
298 msg = malloc(msg_size);
301 _dbus_verbose("Error allocating memory for: %s,%s\n", _dbus_strerror (errno), _dbus_error_from_errno (errno));
305 memset(msg, 0, msg_size);
306 msg->size = msg_size;
307 msg->payload_type = KDBUS_PAYLOAD_DBUS1;
308 msg->dst_id = name ? 0 : dst_id;
309 msg->src_id = strtoull(dbus_bus_get_unique_name(transport->base.connection), NULL , 10);
315 * Sends DBus message using kdbus.
316 * Handles broadcasts and unicast messages, and passing of Unix fds.
317 * Also can locally generate error replies on some error returned by kernel.
319 * TODO refactor to be more compact - maybe we can send header always as a payload vector
320 * and only message body as memfd if needed.
322 * @param transport Transport.
323 * @param message DBus message to be sent
324 * @param destination Destination of the message.
325 * @returns bytes sent or -1 if sending failed
327 static int kdbus_write_msg(DBusTransportKdbus *transport, DBusMessage *message, const char* destination)
329 struct kdbus_msg *msg;
330 struct kdbus_item *item;
331 uint64_t dst_id = KDBUS_DST_ID_BROADCAST;
332 const DBusString *header;
333 const DBusString *body;
334 uint64_t ret_size = 0;
335 uint64_t body_size = 0;
336 uint64_t header_size = 0;
337 dbus_bool_t use_memfd = FALSE;
340 dbus_bool_t autostart;
342 // determine destination and destination id
345 dst_id = KDBUS_DST_ID_WELL_KNOWN_NAME;
346 if((destination[0] == ':') && (destination[1] == '1') && (destination[2] == '.')) /* if name starts with ":1." it is a unique name and should be send as number */
348 dst_id = strtoull(&destination[3], NULL, 10);
353 _dbus_message_get_network_data (message, &header, &body);
354 header_size = _dbus_string_get_length(header);
355 body_size = _dbus_string_get_length(body);
356 ret_size = header_size + body_size;
358 // check whether we can and should use memfd
359 if((dst_id != KDBUS_DST_ID_BROADCAST) && (ret_size > MEMFD_SIZE_THRESHOLD))
362 kdbus_init_memfd(transport);
365 _dbus_message_get_unix_fds(message, &unix_fds, &fds_count);
367 // init basic message fields
368 msg = kdbus_init_msg(destination, dst_id, body_size, use_memfd, fds_count, transport);
369 msg->cookie = dbus_message_get_serial(message);
370 autostart = dbus_message_get_auto_start (message);
372 msg->flags |= KDBUS_MSG_FLAGS_NO_AUTO_START;
374 // build message contents
381 if(ioctl(transport->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 0) < 0)
383 _dbus_verbose("memfd sealing failed: \n");
387 buf = mmap(NULL, ret_size, PROT_WRITE, MAP_SHARED, transport->memfd, 0);
388 if (buf == MAP_FAILED)
390 _dbus_verbose("mmap() fd=%i failed:%m", transport->memfd);
394 memcpy(buf, _dbus_string_get_const_data(header), header_size);
397 memcpy(buf, _dbus_string_get_const_data(body), body_size);
401 munmap(buf, ret_size);
403 // seal data - kdbus module needs it
404 if(ioctl(transport->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) < 0) {
405 _dbus_verbose("memfd sealing failed: %d (%m)\n", errno);
410 item->type = KDBUS_MSG_PAYLOAD_MEMFD;
411 item->size = KDBUS_PART_HEADER_SIZE + sizeof(struct kdbus_memfd);
412 item->memfd.size = ret_size;
413 item->memfd.fd = transport->memfd;
417 _dbus_verbose("sending normal vector data\n");
418 MSG_ITEM_BUILD_VEC(_dbus_string_get_const_data(header), header_size);
422 const char* body_data;
424 body_data = _dbus_string_get_const_data(body);
425 while(body_size > KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE)
427 _dbus_verbose("body attaching\n");
428 item = KDBUS_PART_NEXT(item);
429 MSG_ITEM_BUILD_VEC(body_data, KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE);
430 body_data += KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
431 body_size -= KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
435 _dbus_verbose("body attaching\n");
436 item = KDBUS_PART_NEXT(item);
437 MSG_ITEM_BUILD_VEC(body_data, body_size);
444 item = KDBUS_PART_NEXT(item);
445 item->type = KDBUS_MSG_FDS;
446 item->size = KDBUS_PART_HEADER_SIZE + (sizeof(int) * fds_count);
447 memcpy(item->fds, unix_fds, sizeof(int) * fds_count);
452 item = KDBUS_PART_NEXT(item);
453 item->type = KDBUS_MSG_DST_NAME;
454 item->size = KDBUS_PART_HEADER_SIZE + strlen(destination) + 1;
455 memcpy(item->str, destination, item->size - KDBUS_PART_HEADER_SIZE);
457 else if (dst_id == KDBUS_DST_ID_BROADCAST)
459 item = KDBUS_PART_NEXT(item);
460 item->type = KDBUS_MSG_BLOOM;
461 item->size = KDBUS_PART_HEADER_SIZE + transport->bloom_size;
462 strncpy(item->data, dbus_message_get_interface(message), transport->bloom_size);
466 if (ioctl(transport->fd, KDBUS_CMD_MSG_SEND, msg))
470 else if(errno == ENXIO) //no such id on the bus
472 if(!reply_with_error(DBUS_ERROR_NAME_HAS_NO_OWNER, "Name \"%s\" does not exist", dbus_message_get_destination(message), message, transport->base.connection))
475 else if((errno == ESRCH) || (errno = EADDRNOTAVAIL)) //when well known name is not available on the bus
479 if(!reply_with_error(DBUS_ERROR_SERVICE_UNKNOWN, "The name %s was not provided by any .service files", dbus_message_get_destination(message), message, transport->base.connection))
483 if(!reply_with_error(DBUS_ERROR_NAME_HAS_NO_OWNER, "Name \"%s\" does not exist", dbus_message_get_destination(message), message, transport->base.connection))
486 _dbus_verbose("kdbus error sending message: err %d (%m)\n", errno);
492 close(transport->memfd);
498 * Performs kdbus hello - registration on the kdbus bus
499 * needed to send and receive messages on the bus,
500 * and configures transport.
501 * As a result unique id on he bus is obtained.
503 * @param name place to print id given by bus
504 * @param transportS transport structure
505 * @returns #TRUE on success
507 static dbus_bool_t bus_register_kdbus(char* name, DBusTransportKdbus* transportS)
509 struct kdbus_cmd_hello __attribute__ ((__aligned__(8))) hello;
511 hello.conn_flags = KDBUS_HELLO_ACCEPT_FD/* |
512 KDBUS_HELLO_ATTACH_COMM |
513 KDBUS_HELLO_ATTACH_EXE |
514 KDBUS_HELLO_ATTACH_CMDLINE |
515 KDBUS_HELLO_ATTACH_CAPS |
516 KDBUS_HELLO_ATTACH_CGROUP |
517 KDBUS_HELLO_ATTACH_SECLABEL |
518 KDBUS_HELLO_ATTACH_AUDIT*/;
519 hello.size = sizeof(struct kdbus_cmd_hello);
520 hello.pool_size = RECEIVE_POOL_SIZE;
522 if (ioctl(transportS->fd, KDBUS_CMD_HELLO, &hello))
524 _dbus_verbose ("Failed to send hello: %m, %d",errno);
528 sprintf(name, "%llu", (unsigned long long)hello.id);
529 _dbus_verbose("-- Our peer ID is: %s\n", name);
530 transportS->bloom_size = hello.bloom_size;
532 transportS->kdbus_mmap_ptr = mmap(NULL, RECEIVE_POOL_SIZE, PROT_READ, MAP_SHARED, transportS->fd, 0);
533 if (transportS->kdbus_mmap_ptr == MAP_FAILED)
535 _dbus_verbose("Error when mmap: %m, %d",errno);
543 * Looks over messages sent to org.freedesktop.DBus. Hello message, which performs
544 * registration on the bus, is captured as it must be locally converted into
545 * appropriate ioctl. All the rest org.freedesktop.DBus methods are left untouched
546 * and they are sent to dbus-daemon in the same way as every other messages.
548 * @param transport Transport
549 * @param message Message being sent.
550 * @returns 1 if it is not Hello message and it should be passed to daemon
551 * 0 if Hello message was handled correctly,
552 * -1 if Hello message was not handle correctly.
554 static int capture_hello_message(DBusTransport *transport, const char* destination, DBusMessage *message)
556 if(!strcmp(destination, DBUS_SERVICE_DBUS))
558 if(!strcmp(dbus_message_get_interface(message), DBUS_INTERFACE_DBUS))
560 if(!strcmp(dbus_message_get_member(message), "Hello"))
564 name = malloc(snprintf(name, 0, ":1.%llu0", ULLONG_MAX));
568 if(!bus_register_kdbus(&name[3], (DBusTransportKdbus*)transport))
570 if(!register_kdbus_policy(&name[3], transport, geteuid()))
573 ((DBusTransportKdbus*)transport)->sender = name;
575 if(!reply_1_data(message, DBUS_TYPE_STRING, &name, transport->connection))
576 return 0; //on success we can not free name
585 return 1; //send message to daemon
588 #if KDBUS_MSG_DECODE_DEBUG == 1
589 static char *msg_id(uint64_t id, char *buf)
595 sprintf(buf, "%llu", (unsigned long long)id);
599 struct kdbus_enum_table {
603 #define _STRINGIFY(x) #x
604 #define STRINGIFY(x) _STRINGIFY(x)
605 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
606 #define TABLE(what) static struct kdbus_enum_table kdbus_table_##what[]
607 #define ENUM(_id) { .id=_id, .name=STRINGIFY(_id) }
608 #define LOOKUP(what) \
609 const char *enum_##what(long long id) { \
611 for (i = 0; i < ELEMENTSOF(kdbus_table_##what); i++) \
612 if (id == kdbus_table_##what[i].id) \
613 return kdbus_table_##what[i].name; \
616 const char *enum_MSG(long long id);
618 ENUM(_KDBUS_MSG_NULL),
619 ENUM(KDBUS_MSG_PAYLOAD_VEC),
620 ENUM(KDBUS_MSG_PAYLOAD_OFF),
621 ENUM(KDBUS_MSG_PAYLOAD_MEMFD),
623 ENUM(KDBUS_MSG_BLOOM),
624 ENUM(KDBUS_MSG_DST_NAME),
625 ENUM(KDBUS_MSG_SRC_CREDS),
626 ENUM(KDBUS_MSG_SRC_PID_COMM),
627 ENUM(KDBUS_MSG_SRC_TID_COMM),
628 ENUM(KDBUS_MSG_SRC_EXE),
629 ENUM(KDBUS_MSG_SRC_CMDLINE),
630 ENUM(KDBUS_MSG_SRC_CGROUP),
631 ENUM(KDBUS_MSG_SRC_CAPS),
632 ENUM(KDBUS_MSG_SRC_SECLABEL),
633 ENUM(KDBUS_MSG_SRC_AUDIT),
634 ENUM(KDBUS_MSG_SRC_NAMES),
635 ENUM(KDBUS_MSG_TIMESTAMP),
636 ENUM(KDBUS_MSG_NAME_ADD),
637 ENUM(KDBUS_MSG_NAME_REMOVE),
638 ENUM(KDBUS_MSG_NAME_CHANGE),
639 ENUM(KDBUS_MSG_ID_ADD),
640 ENUM(KDBUS_MSG_ID_REMOVE),
641 ENUM(KDBUS_MSG_REPLY_TIMEOUT),
642 ENUM(KDBUS_MSG_REPLY_DEAD),
645 const char *enum_PAYLOAD(long long id);
647 ENUM(KDBUS_PAYLOAD_KERNEL),
648 ENUM(KDBUS_PAYLOAD_DBUS1),
649 ENUM(KDBUS_PAYLOAD_GVARIANT),
654 * Finalizes locally generated DBus message
655 * and puts it into data buffer.
657 * @param message Message to load.
658 * @param data Place to load message.
659 * @returns Size of message loaded.
661 static int put_message_into_data(DBusMessage *message, char* data)
664 const DBusString *header;
665 const DBusString *body;
668 dbus_message_set_serial(message, 1);
669 dbus_message_lock (message);
670 _dbus_message_get_network_data (message, &header, &body);
671 ret_size = _dbus_string_get_length(header);
672 memcpy(data, _dbus_string_get_const_data(header), ret_size);
674 size = _dbus_string_get_length(body);
675 memcpy(data, _dbus_string_get_const_data(body), size);
682 * Calculates length of the kdbus message content (payload).
684 * @param msg kdbus message
685 * @return the length of the kdbus message's payload.
687 static int kdbus_message_size(const struct kdbus_msg* msg)
689 const struct kdbus_item *item;
692 KDBUS_PART_FOREACH(item, msg, items)
694 if (item->size <= KDBUS_PART_HEADER_SIZE)
696 _dbus_verbose(" +%s (%llu bytes) invalid data record\n", enum_MSG(item->type), item->size);
701 case KDBUS_MSG_PAYLOAD_OFF:
702 ret_size += item->vec.size;
704 case KDBUS_MSG_PAYLOAD_MEMFD:
705 ret_size += item->memfd.size;
716 * Decodes kdbus message in order to extract DBus message and puts it into received data buffer
717 * and file descriptor's buffer. Also captures kdbus error messages and kdbus kernel broadcasts
718 * and converts all of them into appropriate DBus messages.
720 * @param msg kdbus message
721 * @param data place to copy DBus message to
722 * @param kdbus_transport transport
723 * @param fds place to store file descriptors received
724 * @param n_fds place to store quantity of file descriptors received
725 * @return number of DBus message's bytes received or -1 on error
727 static int kdbus_decode_msg(const struct kdbus_msg* msg, char *data, DBusTransportKdbus* kdbus_transport, int* fds, int* n_fds)
729 const struct kdbus_item *item;
731 DBusMessage *message = NULL;
732 DBusMessageIter args;
733 const char* emptyString = "";
734 const char* pString = NULL;
735 char dbus_name[(unsigned int)(snprintf((char*)pString, 0, ":1.%llu0", ULLONG_MAX))];
736 const char* pDBusName = dbus_name;
737 #if KDBUS_MSG_DECODE_DEBUG == 1
741 #if KDBUS_MSG_DECODE_DEBUG == 1
742 _dbus_verbose("MESSAGE: %s (%llu bytes) flags=0x%llx, %s → %s, cookie=%llu, timeout=%llu\n",
743 enum_PAYLOAD(msg->payload_type), (unsigned long long) msg->size,
744 (unsigned long long) msg->flags,
745 msg_id(msg->src_id, buf), msg_id(msg->dst_id, buf),
746 (unsigned long long) msg->cookie, (unsigned long long) msg->timeout_ns);
751 KDBUS_PART_FOREACH(item, msg, items)
753 if (item->size <= KDBUS_PART_HEADER_SIZE)
755 _dbus_verbose(" +%s (%llu bytes) invalid data record\n", enum_MSG(item->type), item->size);
756 break; //??? continue (because dbus will find error) or break
761 case KDBUS_MSG_PAYLOAD_OFF:
762 memcpy(data, (char *)kdbus_transport->kdbus_mmap_ptr + item->vec.offset, item->vec.size);
763 data += item->vec.size;
764 ret_size += item->vec.size;
766 _dbus_verbose(" +%s (%llu bytes) off=%llu size=%llu\n",
767 enum_MSG(item->type), item->size,
768 (unsigned long long)item->vec.offset,
769 (unsigned long long)item->vec.size);
772 case KDBUS_MSG_PAYLOAD_MEMFD:
777 size = item->memfd.size;
778 _dbus_verbose("memfd.size : %llu\n", (unsigned long long)size);
780 buf = mmap(NULL, size, PROT_READ , MAP_SHARED, item->memfd.fd, 0);
781 if (buf == MAP_FAILED)
783 _dbus_verbose("mmap() fd=%i failed:%m", item->memfd.fd);
787 memcpy(data, buf, size);
793 _dbus_verbose(" +%s (%llu bytes) off=%llu size=%llu\n",
794 enum_MSG(item->type), item->size,
795 (unsigned long long)item->vec.offset,
796 (unsigned long long)item->vec.size);
804 *n_fds = (item->size - KDBUS_PART_HEADER_SIZE) / sizeof(int);
805 memcpy(fds, item->fds, *n_fds * sizeof(int));
806 for (i = 0; i < *n_fds; i++)
807 _dbus_fd_set_close_on_exec(fds[i]);
811 #if KDBUS_MSG_DECODE_DEBUG == 1
812 case KDBUS_MSG_SRC_CREDS:
813 _dbus_verbose(" +%s (%llu bytes) uid=%lld, gid=%lld, pid=%lld, tid=%lld, starttime=%lld\n",
814 enum_MSG(item->type), item->size,
815 item->creds.uid, item->creds.gid,
816 item->creds.pid, item->creds.tid,
817 item->creds.starttime);
820 case KDBUS_MSG_SRC_PID_COMM:
821 case KDBUS_MSG_SRC_TID_COMM:
822 case KDBUS_MSG_SRC_EXE:
823 case KDBUS_MSG_SRC_CGROUP:
824 case KDBUS_MSG_SRC_SECLABEL:
825 case KDBUS_MSG_DST_NAME:
826 _dbus_verbose(" +%s (%llu bytes) '%s' (%zu)\n",
827 enum_MSG(item->type), item->size, item->str, strlen(item->str));
830 case KDBUS_MSG_SRC_CMDLINE:
831 case KDBUS_MSG_SRC_NAMES: {
832 __u64 size = item->size - KDBUS_PART_HEADER_SIZE;
833 const char *str = item->str;
836 _dbus_verbose(" +%s (%llu bytes) ", enum_MSG(item->type), item->size);
838 _dbus_verbose("'%s' ", str);
839 size -= strlen(str) + 1;
840 str += strlen(str) + 1;
844 _dbus_verbose("(%d string%s)\n", count, (count == 1) ? "" : "s");
848 case KDBUS_MSG_SRC_AUDIT:
849 _dbus_verbose(" +%s (%llu bytes) loginuid=%llu sessionid=%llu\n",
850 enum_MSG(item->type), item->size,
851 (unsigned long long)item->data64[0],
852 (unsigned long long)item->data64[1]);
855 case KDBUS_MSG_SRC_CAPS: {
860 _dbus_verbose(" +%s (%llu bytes) len=%llu bytes)\n",
861 enum_MSG(item->type), item->size,
862 (unsigned long long)item->size - KDBUS_PART_HEADER_SIZE);
865 n = (item->size - KDBUS_PART_HEADER_SIZE) / 4 / sizeof(uint32_t);
867 _dbus_verbose(" CapInh=");
868 for (i = 0; i < n; i++)
869 _dbus_verbose("%08x", cap[(0 * n) + (n - i - 1)]);
871 _dbus_verbose(" CapPrm=");
872 for (i = 0; i < n; i++)
873 _dbus_verbose("%08x", cap[(1 * n) + (n - i - 1)]);
875 _dbus_verbose(" CapEff=");
876 for (i = 0; i < n; i++)
877 _dbus_verbose("%08x", cap[(2 * n) + (n - i - 1)]);
879 _dbus_verbose(" CapInh=");
880 for (i = 0; i < n; i++)
881 _dbus_verbose("%08x", cap[(3 * n) + (n - i - 1)]);
886 case KDBUS_MSG_TIMESTAMP:
887 _dbus_verbose(" +%s (%llu bytes) realtime=%lluns monotonic=%lluns\n",
888 enum_MSG(item->type), item->size,
889 (unsigned long long)item->timestamp.realtime_ns,
890 (unsigned long long)item->timestamp.monotonic_ns);
894 case KDBUS_MSG_REPLY_TIMEOUT:
895 _dbus_verbose(" +%s (%llu bytes) cookie=%llu\n",
896 enum_MSG(item->type), item->size, msg->cookie_reply);
898 message = generate_local_error_message(msg->cookie_reply, DBUS_ERROR_NO_REPLY, NULL);
905 ret_size = put_message_into_data(message, data);
908 case KDBUS_MSG_REPLY_DEAD:
909 _dbus_verbose(" +%s (%llu bytes) cookie=%llu\n",
910 enum_MSG(item->type), item->size, msg->cookie_reply);
912 message = generate_local_error_message(msg->cookie_reply, DBUS_ERROR_NAME_HAS_NO_OWNER, NULL);
919 ret_size = put_message_into_data(message, data);
922 case KDBUS_MSG_NAME_ADD:
923 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
924 enum_MSG(item->type), (unsigned long long) item->size,
925 item->name_change.name, item->name_change.old_id,
926 item->name_change.new_id, item->name_change.flags);
928 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
935 sprintf(dbus_name,":1.%llu",item->name_change.new_id);
936 pString = item->name_change.name;
937 _dbus_verbose ("Name added: %s\n", pString);
938 dbus_message_iter_init_append(message, &args);
939 ITER_APPEND_STR(pString)
940 ITER_APPEND_STR(emptyString)
941 ITER_APPEND_STR(pDBusName)
942 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
944 ret_size = put_message_into_data(message, data);
947 case KDBUS_MSG_NAME_REMOVE:
948 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
949 enum_MSG(item->type), (unsigned long long) item->size,
950 item->name_change.name, item->name_change.old_id,
951 item->name_change.new_id, item->name_change.flags);
953 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged"); // name of the signal
960 sprintf(dbus_name,":1.%llu",item->name_change.old_id);
961 pString = item->name_change.name;
962 _dbus_verbose ("Name removed: %s\n", pString);
963 dbus_message_iter_init_append(message, &args);
964 ITER_APPEND_STR(pString)
965 ITER_APPEND_STR(pDBusName)
966 ITER_APPEND_STR(emptyString)
967 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
969 ret_size = put_message_into_data(message, data);
972 case KDBUS_MSG_NAME_CHANGE:
973 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
974 enum_MSG(item->type), (unsigned long long) item->size,
975 item->name_change.name, item->name_change.old_id,
976 item->name_change.new_id, item->name_change.flags);
978 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
985 sprintf(dbus_name,":1.%llu",item->name_change.old_id);
986 pString = item->name_change.name;
987 _dbus_verbose ("Name changed: %s\n", pString);
988 dbus_message_iter_init_append(message, &args);
989 ITER_APPEND_STR(pString)
990 ITER_APPEND_STR(pDBusName)
991 sprintf(&dbus_name[3],"%llu",item->name_change.new_id);
992 _dbus_verbose ("New id: %s\n", pDBusName);
993 ITER_APPEND_STR(pDBusName)
994 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
996 ret_size = put_message_into_data(message, data);
999 case KDBUS_MSG_ID_ADD:
1000 _dbus_verbose(" +%s (%llu bytes) id=%llu flags=%llu\n",
1001 enum_MSG(item->type), (unsigned long long) item->size,
1002 (unsigned long long) item->id_change.id,
1003 (unsigned long long) item->id_change.flags);
1005 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
1012 sprintf(dbus_name,":1.%llu",item->id_change.id);
1013 dbus_message_iter_init_append(message, &args);
1014 ITER_APPEND_STR(pDBusName)
1015 ITER_APPEND_STR(emptyString)
1016 ITER_APPEND_STR(pDBusName)
1017 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
1019 ret_size = put_message_into_data(message, data);
1022 case KDBUS_MSG_ID_REMOVE:
1023 _dbus_verbose(" +%s (%llu bytes) id=%llu flags=%llu\n",
1024 enum_MSG(item->type), (unsigned long long) item->size,
1025 (unsigned long long) item->id_change.id,
1026 (unsigned long long) item->id_change.flags);
1028 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
1035 sprintf(dbus_name,":1.%llu",item->id_change.id);
1036 dbus_message_iter_init_append(message, &args);
1037 ITER_APPEND_STR(pDBusName)
1038 ITER_APPEND_STR(pDBusName)
1039 ITER_APPEND_STR(emptyString)
1040 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
1042 ret_size = put_message_into_data(message, data);
1044 #if KDBUS_MSG_DECODE_DEBUG == 1
1046 _dbus_verbose(" +%s (%llu bytes)\n", enum_MSG(item->type), item->size);
1052 #if KDBUS_MSG_DECODE_DEBUG == 1
1054 if ((char *)item - ((char *)msg + msg->size) >= 8)
1055 _dbus_verbose("invalid padding at end of message\n");
1060 dbus_message_unref(message);
1065 * Reads message from kdbus and puts it into DBus buffers
1067 * @param kdbus_transport transport
1068 * @param buffer place to copy received message to
1069 * @param fds place to store file descriptors received with the message
1070 * @param n_fds place to store quantity of file descriptors received
1071 * @return size of received message on success, -1 on error
1073 static int kdbus_read_message(DBusTransportKdbus *kdbus_transport, DBusString *buffer, int* fds, int* n_fds)
1075 int ret_size, buf_size;
1076 uint64_t __attribute__ ((__aligned__(8))) offset;
1077 struct kdbus_msg *msg;
1081 start = _dbus_string_get_length (buffer);
1084 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MSG_RECV, &offset) < 0)
1088 _dbus_verbose("kdbus error receiving message: %d (%m)\n", errno);
1089 _dbus_string_set_length (buffer, start);
1093 msg = (struct kdbus_msg *)((char*)kdbus_transport->kdbus_mmap_ptr + offset);
1095 buf_size = kdbus_message_size(msg);
1098 _dbus_verbose("kdbus error - too short message: %d (%m)\n", errno);
1102 /* What is the maximum size of the locally generated message?
1103 I just assume 2048 bytes */
1104 buf_size = MAX(buf_size, 2048);
1106 if (!_dbus_string_lengthen (buffer, buf_size))
1111 data = _dbus_string_get_data_len (buffer, start, buf_size);
1113 ret_size = kdbus_decode_msg(msg, data, kdbus_transport, fds, n_fds);
1115 if(ret_size == -1) /* error */
1117 _dbus_string_set_length (buffer, start);
1120 else if (buf_size != ret_size) /* case of locally generated message */
1122 _dbus_string_set_length (buffer, start + ret_size);
1126 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MSG_RELEASE, &offset) < 0)
1130 _dbus_verbose("kdbus error freeing message: %d (%m)\n", errno);
1138 * Copy-paste from socket transport. Only renames done.
1141 free_watches (DBusTransport *transport)
1143 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1145 _dbus_verbose ("start\n");
1147 if (kdbus_transport->read_watch)
1149 if (transport->connection)
1150 _dbus_connection_remove_watch_unlocked (transport->connection,
1151 kdbus_transport->read_watch);
1152 _dbus_watch_invalidate (kdbus_transport->read_watch);
1153 _dbus_watch_unref (kdbus_transport->read_watch);
1154 kdbus_transport->read_watch = NULL;
1157 if (kdbus_transport->write_watch)
1159 if (transport->connection)
1160 _dbus_connection_remove_watch_unlocked (transport->connection,
1161 kdbus_transport->write_watch);
1162 _dbus_watch_invalidate (kdbus_transport->write_watch);
1163 _dbus_watch_unref (kdbus_transport->write_watch);
1164 kdbus_transport->write_watch = NULL;
1167 _dbus_verbose ("end\n");
1171 * Copy-paste from socket transport. Only done needed renames and removed
1172 * lines related to encoded messages.
1175 transport_finalize (DBusTransport *transport)
1177 _dbus_verbose ("\n");
1179 free_watches (transport);
1181 _dbus_transport_finalize_base (transport);
1183 _dbus_assert (((DBusTransportKdbus*) transport)->read_watch == NULL);
1184 _dbus_assert (((DBusTransportKdbus*) transport)->write_watch == NULL);
1186 dbus_free (transport);
1190 * Copy-paste from socket transport. Removed code related to authentication,
1191 * socket_transport replaced by kdbus_transport.
1194 check_write_watch (DBusTransport *transport)
1196 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1199 if (transport->connection == NULL)
1202 if (transport->disconnected)
1204 _dbus_assert (kdbus_transport->write_watch == NULL);
1208 _dbus_transport_ref (transport);
1210 needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
1212 _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
1213 needed, transport->connection, kdbus_transport->write_watch,
1214 kdbus_transport->fd,
1215 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
1217 _dbus_connection_toggle_watch_unlocked (transport->connection,
1218 kdbus_transport->write_watch,
1221 _dbus_transport_unref (transport);
1225 * Copy-paste from socket transport. Removed code related to authentication,
1226 * socket_transport replaced by kdbus_transport.
1229 check_read_watch (DBusTransport *transport)
1231 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1232 dbus_bool_t need_read_watch;
1234 _dbus_verbose ("fd = %d\n",kdbus_transport->fd);
1236 if (transport->connection == NULL)
1239 if (transport->disconnected)
1241 _dbus_assert (kdbus_transport->read_watch == NULL);
1245 _dbus_transport_ref (transport);
1248 (_dbus_counter_get_size_value (transport->live_messages) < transport->max_live_messages_size) &&
1249 (_dbus_counter_get_unix_fd_value (transport->live_messages) < transport->max_live_messages_unix_fds);
1251 _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
1252 _dbus_connection_toggle_watch_unlocked (transport->connection,
1253 kdbus_transport->read_watch,
1256 _dbus_transport_unref (transport);
1260 * Copy-paste from socket transport.
1263 do_io_error (DBusTransport *transport)
1265 _dbus_transport_ref (transport);
1266 _dbus_transport_disconnect (transport);
1267 _dbus_transport_unref (transport);
1271 * Based on do_writing from socket transport.
1272 * Removed authentication code and code related to encoded messages
1273 * and adapted to kdbus transport.
1274 * In socket transport returns false on out-of-memory. Here this won't happen,
1275 * so it always returns TRUE.
1278 do_writing (DBusTransport *transport)
1280 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1283 if (transport->disconnected)
1285 _dbus_verbose ("Not connected, not writing anything\n");
1289 _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
1290 _dbus_connection_has_messages_to_send_unlocked (transport->connection),
1291 kdbus_transport->fd);
1293 while (!transport->disconnected && _dbus_connection_has_messages_to_send_unlocked (transport->connection))
1296 DBusMessage *message;
1297 const DBusString *header;
1298 const DBusString *body;
1299 int total_bytes_to_write;
1300 const char* pDestination;
1302 if (total > kdbus_transport->max_bytes_written_per_iteration)
1304 _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
1305 total, kdbus_transport->max_bytes_written_per_iteration);
1309 message = _dbus_connection_get_message_to_send (transport->connection);
1310 _dbus_assert (message != NULL);
1311 if(dbus_message_get_sender(message) == NULL) //needed for daemon to pass pending activation messages
1313 dbus_message_unlock(message);
1314 dbus_message_set_sender(message, kdbus_transport->sender);
1315 dbus_message_lock (message);
1317 _dbus_message_get_network_data (message, &header, &body);
1318 total_bytes_to_write = _dbus_string_get_length(header) + _dbus_string_get_length(body);
1319 pDestination = dbus_message_get_destination(message);
1325 ret = capture_hello_message(transport, pDestination, message);
1331 else if(ret == 0) //hello message captured and handled correctly
1333 bytes_written = total_bytes_to_write;
1336 //else send as regular message
1339 bytes_written = kdbus_write_msg(kdbus_transport, message, pDestination);
1342 if (bytes_written < 0)
1344 /* EINTR already handled for us */
1346 /* For some discussion of why we also ignore EPIPE here, see
1347 * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html
1350 if (_dbus_get_is_errno_eagain_or_ewouldblock () || _dbus_get_is_errno_epipe ())
1354 _dbus_verbose ("Error writing to remote app: %s\n", _dbus_strerror_from_errno ());
1355 do_io_error (transport);
1361 _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
1362 total_bytes_to_write);
1364 total += bytes_written;
1366 _dbus_assert (bytes_written == total_bytes_to_write);
1368 _dbus_connection_message_sent_unlocked (transport->connection,
1378 * Based on do_reading from socket transport.
1379 * Removed authentication code and code related to encoded messages
1380 * and adapted to kdbus transport.
1381 * returns false on out-of-memory
1384 do_reading (DBusTransport *transport)
1386 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1389 dbus_bool_t oom = FALSE;
1393 _dbus_verbose ("fd = %d\n",kdbus_transport->fd);
1397 /* See if we've exceeded max messages and need to disable reading */
1398 check_read_watch (transport);
1400 if (total > kdbus_transport->max_bytes_read_per_iteration)
1402 _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
1403 total, kdbus_transport->max_bytes_read_per_iteration);
1407 _dbus_assert (kdbus_transport->read_watch != NULL ||
1408 transport->disconnected);
1410 if (transport->disconnected)
1413 if (!dbus_watch_get_enabled (kdbus_transport->read_watch))
1416 if (!_dbus_message_loader_get_unix_fds(transport->loader, &fds, &n_fds))
1418 _dbus_verbose ("Out of memory reading file descriptors\n");
1422 _dbus_message_loader_get_buffer (transport->loader, &buffer);
1424 bytes_read = kdbus_read_message(kdbus_transport, buffer, fds, &n_fds);
1426 if (bytes_read >= 0 && n_fds > 0)
1427 _dbus_verbose("Read %i unix fds\n", n_fds);
1429 _dbus_message_loader_return_buffer (transport->loader,
1431 bytes_read < 0 ? 0 : bytes_read);
1432 _dbus_message_loader_return_unix_fds(transport->loader, fds, bytes_read < 0 ? 0 : n_fds);
1436 /* EINTR already handled for us */
1438 if (_dbus_get_is_errno_enomem ())
1440 _dbus_verbose ("Out of memory in read()/do_reading()\n");
1444 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
1448 _dbus_verbose ("Error reading from remote app: %s\n",
1449 _dbus_strerror_from_errno ());
1450 do_io_error (transport);
1454 else if (bytes_read == 0)
1456 _dbus_verbose ("Disconnected from remote app\n");
1457 do_io_error (transport);
1462 _dbus_verbose (" read %d bytes\n", bytes_read);
1464 total += bytes_read;
1466 if (!_dbus_transport_queue_messages (transport))
1469 _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
1473 /* Try reading more data until we get EAGAIN and return, or
1474 * exceed max bytes per iteration. If in blocking mode of
1475 * course we'll block instead of returning.
1487 * Copy-paste from socket transport, with socket replaced by kdbus.
1490 unix_error_with_read_to_come (DBusTransport *itransport,
1494 DBusTransportKdbus *transport = (DBusTransportKdbus *) itransport;
1496 if (!((flags & DBUS_WATCH_HANGUP) || (flags & DBUS_WATCH_ERROR)))
1499 /* If we have a read watch enabled ...
1500 we -might have data incoming ... => handle the HANGUP there */
1501 if (watch != transport->read_watch && _dbus_watch_get_enabled (transport->read_watch))
1508 * Copy-paste from socket transport. Removed authentication related code
1509 * and renamed socket_transport to kdbus_transport.
1512 kdbus_handle_watch (DBusTransport *transport,
1516 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1518 _dbus_assert (watch == kdbus_transport->read_watch ||
1519 watch == kdbus_transport->write_watch);
1520 _dbus_assert (watch != NULL);
1522 /* If we hit an error here on a write watch, don't disconnect the transport yet because data can
1523 * still be in the buffer and do_reading may need several iteration to read
1524 * it all (because of its max_bytes_read_per_iteration limit).
1526 if (!(flags & DBUS_WATCH_READABLE) && unix_error_with_read_to_come (transport, watch, flags))
1528 _dbus_verbose ("Hang up or error on watch\n");
1529 _dbus_transport_disconnect (transport);
1533 if (watch == kdbus_transport->read_watch &&
1534 (flags & DBUS_WATCH_READABLE))
1536 _dbus_verbose ("handling read watch %p flags = %x\n",
1539 if (!do_reading (transport))
1541 _dbus_verbose ("no memory to read\n");
1546 else if (watch == kdbus_transport->write_watch &&
1547 (flags & DBUS_WATCH_WRITABLE))
1549 _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
1550 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
1552 if (!do_writing (transport))
1554 _dbus_verbose ("no memory to write\n");
1558 /* See if we still need the write watch */
1559 check_write_watch (transport);
1566 * Copy-paste from socket transport, but socket_transport renamed to kdbus_transport
1567 * and _dbus_close_socket replaced with close().
1570 kdbus_disconnect (DBusTransport *transport)
1572 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1574 _dbus_verbose ("\n");
1576 free_watches (transport);
1579 if (close (kdbus_transport->fd) < 0)
1585 kdbus_transport->fd = -1;
1589 * Copy-paste from socket transport. Renamed socket_transport to
1590 * kdbus_transport and added dbus_connection_set_is_authenticated, because
1591 * we do not perform authentication in kdbus, so we have mark is as already done
1592 * to make everything work.
1595 kdbus_connection_set (DBusTransport *transport)
1597 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1599 dbus_connection_set_is_authenticated(transport->connection); //now we don't have authentication in kdbus, so mark it done
1601 _dbus_watch_set_handler (kdbus_transport->write_watch,
1602 _dbus_connection_handle_watch,
1603 transport->connection, NULL);
1605 _dbus_watch_set_handler (kdbus_transport->read_watch,
1606 _dbus_connection_handle_watch,
1607 transport->connection, NULL);
1609 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1610 kdbus_transport->write_watch))
1613 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1614 kdbus_transport->read_watch))
1616 _dbus_connection_remove_watch_unlocked (transport->connection,
1617 kdbus_transport->write_watch);
1621 check_read_watch (transport);
1622 check_write_watch (transport);
1628 * Copy-paste from socket_transport.
1629 * Socket_transport renamed to kdbus_transport
1631 * Original dbus copy-pasted @todo comment below.
1632 * @todo We need to have a way to wake up the select sleep if
1633 * a new iteration request comes in with a flag (read/write) that
1634 * we're not currently serving. Otherwise a call that just reads
1635 * could block a write call forever (if there are no incoming
1639 kdbus_do_iteration (DBusTransport *transport,
1641 int timeout_milliseconds)
1643 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1648 _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
1649 flags & DBUS_ITERATION_DO_READING ? "read" : "",
1650 flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
1651 timeout_milliseconds,
1652 kdbus_transport->read_watch,
1653 kdbus_transport->write_watch,
1654 kdbus_transport->fd);
1656 poll_fd.fd = kdbus_transport->fd;
1659 /* This is kind of a hack; if we have stuff to write, then try
1660 * to avoid the poll. This is probably about a 5% speedup on an
1661 * echo client/server.
1663 * If both reading and writing were requested, we want to avoid this
1664 * since it could have funky effects:
1665 * - both ends spinning waiting for the other one to read
1666 * data so they can finish writing
1667 * - prioritizing all writing ahead of reading
1669 if ((flags & DBUS_ITERATION_DO_WRITING) &&
1670 !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
1671 !transport->disconnected &&
1672 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
1674 do_writing (transport);
1676 if (transport->disconnected ||
1677 !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
1681 /* If we get here, we decided to do the poll() after all */
1682 _dbus_assert (kdbus_transport->read_watch);
1683 if (flags & DBUS_ITERATION_DO_READING)
1684 poll_fd.events |= _DBUS_POLLIN;
1686 _dbus_assert (kdbus_transport->write_watch);
1687 if (flags & DBUS_ITERATION_DO_WRITING)
1688 poll_fd.events |= _DBUS_POLLOUT;
1692 if (flags & DBUS_ITERATION_BLOCK)
1693 poll_timeout = timeout_milliseconds;
1697 /* For blocking selects we drop the connection lock here
1698 * to avoid blocking out connection access during a potentially
1699 * indefinite blocking call. The io path is still protected
1700 * by the io_path_cond condvar, so we won't reenter this.
1702 if (flags & DBUS_ITERATION_BLOCK)
1704 _dbus_verbose ("unlock pre poll\n");
1705 _dbus_connection_unlock (transport->connection);
1709 poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1711 if (poll_res < 0 && _dbus_get_is_errno_eintr ())
1714 if (flags & DBUS_ITERATION_BLOCK)
1716 _dbus_verbose ("lock post poll\n");
1717 _dbus_connection_lock (transport->connection);
1723 poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1724 * valgrind flags it as an error. though it probably
1725 * is guaranteed on linux at least.
1728 if (poll_fd.revents & _DBUS_POLLERR)
1729 do_io_error (transport);
1732 dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1733 dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1735 _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1736 need_read, need_write);
1738 if (need_read && (flags & DBUS_ITERATION_DO_READING))
1739 do_reading (transport);
1740 if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1741 do_writing (transport);
1745 _dbus_verbose ("Error from _dbus_poll(): %s\n", _dbus_strerror_from_errno ());
1749 /* We need to install the write watch only if we did not
1750 * successfully write everything. Note we need to be careful that we
1751 * don't call check_write_watch *before* do_writing, since it's
1752 * inefficient to add the write watch, and we can avoid it most of
1753 * the time since we can write immediately.
1755 * However, we MUST always call check_write_watch(); DBusConnection code
1756 * relies on the fact that running an iteration will notice that
1757 * messages are pending.
1759 check_write_watch (transport);
1761 _dbus_verbose (" ... leaving do_iteration()\n");
1765 * Copy-paste from socket transport.
1768 kdbus_live_messages_changed (DBusTransport *transport)
1770 /* See if we should look for incoming messages again */
1771 check_read_watch (transport);
1775 * Gets file descriptor of the kdbus bus.
1776 * @param transport transport
1777 * @param fd_p place to write fd to
1778 * @returns always TRUE
1781 kdbus_get_kdbus_fd (DBusTransport *transport,
1784 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1786 *fd_p = kdbus_transport->fd;
1791 static const DBusTransportVTable kdbus_vtable = {
1795 kdbus_connection_set,
1797 kdbus_live_messages_changed,
1802 * Copy-paste from dbus_transport_socket with needed changes.
1804 * Creates a new transport for the given kdbus file descriptor and address.
1805 * The file descriptor must be nonblocking.
1807 * @param fd the file descriptor.
1808 * @param address the transport's address
1809 * @returns the new transport, or #NULL if no memory.
1811 static DBusTransport*
1812 new_kdbus_transport (int fd, const DBusString *address)
1814 DBusTransportKdbus *kdbus_transport;
1816 kdbus_transport = dbus_new0 (DBusTransportKdbus, 1);
1817 if (kdbus_transport == NULL)
1820 kdbus_transport->write_watch = _dbus_watch_new (fd,
1821 DBUS_WATCH_WRITABLE,
1824 if (kdbus_transport->write_watch == NULL)
1827 kdbus_transport->read_watch = _dbus_watch_new (fd,
1828 DBUS_WATCH_READABLE,
1831 if (kdbus_transport->read_watch == NULL)
1834 if (!_dbus_transport_init_base (&kdbus_transport->base,
1839 kdbus_transport->fd = fd;
1841 /* These values should probably be tunable or something. */
1842 kdbus_transport->max_bytes_read_per_iteration = MAX_BYTES_PER_ITERATION;
1843 kdbus_transport->max_bytes_written_per_iteration = MAX_BYTES_PER_ITERATION;
1845 kdbus_transport->kdbus_mmap_ptr = NULL;
1846 kdbus_transport->memfd = -1;
1848 return (DBusTransport*) kdbus_transport;
1851 _dbus_watch_invalidate (kdbus_transport->read_watch);
1852 _dbus_watch_unref (kdbus_transport->read_watch);
1854 _dbus_watch_invalidate (kdbus_transport->write_watch);
1855 _dbus_watch_unref (kdbus_transport->write_watch);
1857 dbus_free (kdbus_transport);
1862 * Opens a connection to the kdbus bus
1864 * @param path the path to kdbus bus
1865 * @param error return location for error code
1866 * @returns connection file descriptor or -1 on error
1868 static int _dbus_connect_kdbus (const char *path, DBusError *error)
1872 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1873 _dbus_verbose ("connecting to kdbus bus %s\n", path);
1875 fd = open(path, O_RDWR|O_CLOEXEC|O_NONBLOCK);
1877 dbus_set_error(error, _dbus_error_from_errno (errno), "Failed to open file descriptor: %s", _dbus_strerror (errno));
1883 * Connects to kdbus, creates and sets-up transport.
1885 * @param path the path to the bus.
1886 * @param error address where an error can be returned.
1887 * @returns a new transport, or #NULL on failure.
1889 static DBusTransport* _dbus_transport_new_for_kdbus (const char *path, DBusError *error)
1892 DBusTransport *transport;
1895 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1897 if (!_dbus_string_init (&address))
1899 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1905 if ((!_dbus_string_append (&address, "kdbus:path=")) || (!_dbus_string_append (&address, path)))
1907 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1911 fd = _dbus_connect_kdbus (path, error);
1914 _DBUS_ASSERT_ERROR_IS_SET (error);
1918 _dbus_verbose ("Successfully connected to kdbus bus %s\n", path);
1920 transport = new_kdbus_transport (fd, &address);
1921 if (transport == NULL)
1923 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1927 _dbus_string_free (&address);
1939 _dbus_string_free (&address);
1945 * Opens kdbus transport if method from address entry is kdbus
1947 * @param entry the address entry to open
1948 * @param transport_p return location for the opened transport
1949 * @param error place to store error
1950 * @returns result of the attempt as a DBusTransportOpenResult enum
1952 DBusTransportOpenResult _dbus_transport_open_kdbus(DBusAddressEntry *entry,
1953 DBusTransport **transport_p,
1958 method = dbus_address_entry_get_method (entry);
1959 _dbus_assert (method != NULL);
1961 if (strcmp (method, "kdbus") == 0)
1963 const char *path = dbus_address_entry_get_value (entry, "path");
1967 _dbus_set_bad_address (error, "kdbus", "path", NULL);
1968 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1971 *transport_p = _dbus_transport_new_for_kdbus (path, error);
1973 if (*transport_p == NULL)
1975 _DBUS_ASSERT_ERROR_IS_SET (error);
1976 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1980 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1981 return DBUS_TRANSPORT_OPEN_OK;
1986 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1987 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;