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>
49 #define RECEIVE_POOL_SIZE (10 * 1024LU * 1024LU) //size of the memory area for received non-memfd messages
50 #define MEMFD_SIZE_THRESHOLD (2 * 1024 * 1024LU) // over this memfd is used to send (if it is not broadcast)
51 //todo add compilation-time check if MEMFD_SIZE_THERSHOLD is lower than max payload vector size defined in kdbus.h
53 #define KDBUS_MSG_DECODE_DEBUG 0
55 #define ITER_APPEND_STR(string) \
56 if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &string)) \
62 #define MSG_ITEM_BUILD_VEC(data, datasize) \
63 item->type = KDBUS_MSG_PAYLOAD_VEC; \
64 item->size = KDBUS_PART_HEADER_SIZE + sizeof(struct kdbus_vec); \
65 item->vec.address = (unsigned long) data; \
66 item->vec.size = datasize;
68 #define KDBUS_PART_FOREACH(part, head, first) \
69 for (part = (head)->first; \
70 (uint8_t *)(part) < (uint8_t *)(head) + (head)->size; \
71 part = KDBUS_PART_NEXT(part))
74 * Opaque object representing a transport.
76 typedef struct DBusTransportKdbus DBusTransportKdbus;
79 * Implementation details of DBusTransportKdbus. All members are private.
81 struct DBusTransportKdbus
83 DBusTransport base; /**< Parent instance */
84 int fd; /**< File descriptor. */
85 DBusWatch *read_watch; /**< Watch for readability. */
86 DBusWatch *write_watch; /**< Watch for writability. */
88 int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
89 int max_bytes_written_per_iteration; /**< To avoid blocking too long. */
91 void* kdbus_mmap_ptr; /**< Mapped memory where kdbus (kernel) writes
92 * messages incoming to us.
94 int memfd; /**< File descriptor to special
95 * memory pool for bulk data
96 * transfer. Retrieved from
97 * Kdbus kernel module.
99 __u64 bloom_size; /**< bloom filter field size */
100 char* sender; /**< unique name of the sender */
104 * Gets size in bytes of bloom filter field.
105 * This size is got from the bus during connection procedure.
106 * @param transport transport
107 * @returns size of bloom
109 __u64 dbus_transport_get_bloom_size(DBusTransport* transport)
111 return ((DBusTransportKdbus*)transport)->bloom_size;
115 * Puts locally generated message into received messages queue
116 * @param message message that will be added
117 * @param connection connection to which message will be added
118 * @returns TRUE on success, FALSE on memory allocation error
120 static dbus_bool_t add_message_to_received(DBusMessage *message, DBusConnection* connection)
122 DBusList *message_link;
124 message_link = _dbus_list_alloc_link (message);
125 if (message_link == NULL)
127 dbus_message_unref (message);
131 _dbus_connection_queue_synthesized_message_link(connection, message_link);
137 * Generates local error message as a reply to message given as parameter
138 * and adds generated error message to received messages queue.
139 * @param error_Type type of error, preferably DBUS_ERROR_(...)
140 * @param template Template of error description. It can has formatting
141 * characters to print object string into it. Can be NULL.
142 * @param object String to print into error description. Can be NULL.
143 * If object is not NULL while template is NULL, the object string
144 * will be the only error description.
145 * @param message Message for which the error reply is generated.
146 * @param connection The connection.
147 * @returns 0 on success, otherwise -1
149 static int reply_with_error(char* error_type, const char* template, const char* object, DBusMessage *message, DBusConnection* connection)
151 DBusMessage *errMessage;
152 char* error_msg = "";
156 error_msg = alloca(strlen(template) + strlen(object));
157 sprintf(error_msg, template, object);
160 error_msg = (char*)object;
162 errMessage = generate_local_error_message(dbus_message_get_serial(message), error_type, error_msg);
163 if(errMessage == NULL)
165 if (add_message_to_received(errMessage, connection))
172 * Generates reply to the message given as a parameter with one item in the reply body
173 * and adds generated reply message to received messages queue.
174 * @param message The message we are replying to.
175 * @param data_type Type of data sent in the reply.Use DBUS_TYPE_(...)
176 * @param pData Address of data sent in the reply.
177 * @param connection The connection
178 * @returns 0 on success, otherwise -1
180 static int reply_1_data(DBusMessage *message, int data_type, void* pData, DBusConnection* connection)
182 DBusMessageIter args;
185 reply = dbus_message_new_method_return(message);
188 dbus_message_set_sender(reply, DBUS_SERVICE_DBUS);
189 dbus_message_iter_init_append(reply, &args);
190 if (!dbus_message_iter_append_basic(&args, data_type, pData))
192 dbus_message_unref(reply);
195 if(add_message_to_received(reply, connection))
202 static int reply_ack(DBusMessage *message, DBusConnection* connection)
206 reply = dbus_message_new_method_return(message);
209 if(add_message_to_received(reply, connection))
215 * Retrieves file descriptor to memory pool from kdbus module and stores
216 * it in kdbus_transport->memfd. It is then used to send large message.
217 * Triggered when message payload is over MEMFD_SIZE_THRESHOLD
218 * @param kdbus_transport DBusTransportKdbus transport structure
219 * @returns 0 on success, otherwise -1
221 static int kdbus_init_memfd(DBusTransportKdbus* kdbus_transport)
225 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MEMFD_NEW, &memfd) < 0) {
226 _dbus_verbose("KDBUS_CMD_MEMFD_NEW failed: \n");
230 kdbus_transport->memfd = memfd;
231 _dbus_verbose("kdbus_init_memfd: %d!!\n", kdbus_transport->memfd);
236 * Allocates and initializes kdbus message structure.
237 * @param name Well-known name or NULL. If NULL, dst_id must be supplied.
238 * @param dst_id Numeric id of recipient. Ignored if name is not NULL.
239 * @param body_size Size of message body (May be 0).
240 * @param use_memfd Flag to build memfd message.
241 * @param fds_count Number of file descriptors sent in the message.
242 * @param transport transport
243 * @returns initialized kdbus message or NULL if malloc failed
245 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)
247 struct kdbus_msg* msg;
250 msg_size = sizeof(struct kdbus_msg);
252 if(use_memfd == TRUE) // bulk data - memfd
253 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_memfd));
256 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec)); //header is a must
257 while(body_size > KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE)
259 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec));
260 body_size -= KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
263 msg_size += KDBUS_ITEM_SIZE(sizeof(struct kdbus_vec));
267 msg_size += KDBUS_ITEM_SIZE(sizeof(int)*fds_count);
270 msg_size += KDBUS_ITEM_SIZE(strlen(name) + 1);
271 else if (dst_id == KDBUS_DST_ID_BROADCAST)
272 msg_size += KDBUS_PART_HEADER_SIZE + transport->bloom_size;
274 msg = malloc(msg_size);
277 _dbus_verbose("Error allocating memory for: %s,%s\n", _dbus_strerror (errno), _dbus_error_from_errno (errno));
281 memset(msg, 0, msg_size);
282 msg->size = msg_size;
283 msg->payload_type = KDBUS_PAYLOAD_DBUS1;
284 msg->dst_id = name ? 0 : dst_id;
285 msg->src_id = strtoull(dbus_bus_get_unique_name(transport->base.connection), NULL , 10);
291 * Sends DBus message using kdbus.
292 * Handles broadcasts and unicast messages, and passing of Unix fds.
293 * Also can locally generate error replies on some error returned by kernel.
295 * TODO refactor to be more compact - maybe we can send header always as a payload vector
296 * and only message body as memfd if needed.
298 * @param transport Transport.
299 * @param message DBus message to be sent
300 * @param destination Destination of the message.
301 * @returns bytes sent or -1 if sending failed
303 static int kdbus_write_msg(DBusTransportKdbus *transport, DBusMessage *message, const char* destination)
305 struct kdbus_msg *msg;
306 struct kdbus_item *item;
307 uint64_t dst_id = KDBUS_DST_ID_BROADCAST;
308 const DBusString *header;
309 const DBusString *body;
310 uint64_t ret_size = 0;
311 uint64_t body_size = 0;
312 uint64_t header_size = 0;
313 dbus_bool_t use_memfd = FALSE;
316 dbus_bool_t autostart;
318 // determine destination and destination id
321 dst_id = KDBUS_DST_ID_WELL_KNOWN_NAME;
322 if((destination[0] == ':') && (destination[1] == '1') && (destination[2] == '.')) /* if name starts with ":1." it is a unique name and should be send as number */
324 dst_id = strtoull(&destination[3], NULL, 10);
329 _dbus_message_get_network_data (message, &header, &body);
330 header_size = _dbus_string_get_length(header);
331 body_size = _dbus_string_get_length(body);
332 ret_size = header_size + body_size;
334 // check whether we can and should use memfd
335 if((dst_id != KDBUS_DST_ID_BROADCAST) && (ret_size > MEMFD_SIZE_THRESHOLD))
338 kdbus_init_memfd(transport);
341 _dbus_message_get_unix_fds(message, &unix_fds, &fds_count);
343 // init basic message fields
344 msg = kdbus_init_msg(destination, dst_id, body_size, use_memfd, fds_count, transport);
345 msg->cookie = dbus_message_get_serial(message);
346 autostart = dbus_message_get_auto_start (message);
348 msg->flags |= KDBUS_MSG_FLAGS_NO_AUTO_START;
350 // build message contents
357 if(ioctl(transport->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 0) < 0)
359 _dbus_verbose("memfd sealing failed: \n");
363 buf = mmap(NULL, ret_size, PROT_WRITE, MAP_SHARED, transport->memfd, 0);
364 if (buf == MAP_FAILED)
366 _dbus_verbose("mmap() fd=%i failed:%m", transport->memfd);
370 memcpy(buf, _dbus_string_get_const_data(header), header_size);
373 memcpy(buf, _dbus_string_get_const_data(body), body_size);
377 munmap(buf, ret_size);
379 // seal data - kdbus module needs it
380 if(ioctl(transport->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) < 0) {
381 _dbus_verbose("memfd sealing failed: %d (%m)\n", errno);
386 item->type = KDBUS_MSG_PAYLOAD_MEMFD;
387 item->size = KDBUS_PART_HEADER_SIZE + sizeof(struct kdbus_memfd);
388 item->memfd.size = ret_size;
389 item->memfd.fd = transport->memfd;
393 _dbus_verbose("sending normal vector data\n");
394 MSG_ITEM_BUILD_VEC(_dbus_string_get_const_data(header), header_size);
398 const char* body_data;
400 body_data = _dbus_string_get_const_data(body);
401 while(body_size > KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE)
403 _dbus_verbose("body attaching\n");
404 item = KDBUS_PART_NEXT(item);
405 MSG_ITEM_BUILD_VEC(body_data, KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE);
406 body_data += KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
407 body_size -= KDBUS_MSG_MAX_PAYLOAD_VEC_SIZE;
411 _dbus_verbose("body attaching\n");
412 item = KDBUS_PART_NEXT(item);
413 MSG_ITEM_BUILD_VEC(body_data, body_size);
420 item = KDBUS_PART_NEXT(item);
421 item->type = KDBUS_MSG_FDS;
422 item->size = KDBUS_PART_HEADER_SIZE + (sizeof(int) * fds_count);
423 memcpy(item->fds, unix_fds, sizeof(int) * fds_count);
428 item = KDBUS_PART_NEXT(item);
429 item->type = KDBUS_MSG_DST_NAME;
430 item->size = KDBUS_PART_HEADER_SIZE + strlen(destination) + 1;
431 memcpy(item->str, destination, item->size - KDBUS_PART_HEADER_SIZE);
433 else if (dst_id == KDBUS_DST_ID_BROADCAST)
435 item = KDBUS_PART_NEXT(item);
436 item->type = KDBUS_MSG_BLOOM;
437 item->size = KDBUS_PART_HEADER_SIZE + transport->bloom_size;
438 strncpy(item->data, dbus_message_get_interface(message), transport->bloom_size);
442 if (ioctl(transport->fd, KDBUS_CMD_MSG_SEND, msg))
446 else if(errno == ENXIO) //no such id on the bus
448 if(!reply_with_error(DBUS_ERROR_NAME_HAS_NO_OWNER, "Name \"%s\" does not exist", dbus_message_get_destination(message), message, transport->base.connection))
451 else if((errno == ESRCH) || (errno = EADDRNOTAVAIL)) //when well known name is not available on the bus
455 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))
459 if(!reply_with_error(DBUS_ERROR_NAME_HAS_NO_OWNER, "Name \"%s\" does not exist", dbus_message_get_destination(message), message, transport->base.connection))
462 _dbus_verbose("kdbus error sending message: err %d (%m)\n", errno);
468 close(transport->memfd);
474 * Performs kdbus hello - registration on the kdbus bus
475 * needed to send and receive messages on the bus,
476 * and configures transport.
477 * As a result unique id on he bus is obtained.
479 * @param name place to print id given by bus
480 * @param transportS transport structure
481 * @returns #TRUE on success
483 static dbus_bool_t bus_register_kdbus(char* name, DBusTransportKdbus* transportS)
485 struct kdbus_cmd_hello __attribute__ ((__aligned__(8))) hello;
487 hello.conn_flags = KDBUS_HELLO_ACCEPT_FD/* |
488 KDBUS_HELLO_ATTACH_COMM |
489 KDBUS_HELLO_ATTACH_EXE |
490 KDBUS_HELLO_ATTACH_CMDLINE |
491 KDBUS_HELLO_ATTACH_CAPS |
492 KDBUS_HELLO_ATTACH_CGROUP |
493 KDBUS_HELLO_ATTACH_SECLABEL |
494 KDBUS_HELLO_ATTACH_AUDIT*/;
495 hello.size = sizeof(struct kdbus_cmd_hello);
496 hello.pool_size = RECEIVE_POOL_SIZE;
498 if (ioctl(transportS->fd, KDBUS_CMD_HELLO, &hello))
500 _dbus_verbose ("Failed to send hello: %m, %d",errno);
504 sprintf(name, "%llu", (unsigned long long)hello.id);
505 _dbus_verbose("-- Our peer ID is: %s\n", name);
506 transportS->bloom_size = hello.bloom_size;
508 transportS->kdbus_mmap_ptr = mmap(NULL, RECEIVE_POOL_SIZE, PROT_READ, MAP_SHARED, transportS->fd, 0);
509 if (transportS->kdbus_mmap_ptr == MAP_FAILED)
511 _dbus_verbose("Error when mmap: %m, %d",errno);
519 * Looks over messages sent to org.freedesktop.DBus. Hello message, which performs
520 * registration on the bus, is captured as it must be locally converted into
521 * appropriate ioctl. All the rest org.freedesktop.DBus methods are left untouched
522 * and they are sent to dbus-daemon in the same way as every other messages.
524 * @param transport Transport
525 * @param message Message being sent.
526 * @returns 1 if it is not Hello message and it should be passed to daemon
527 * 0 if Hello message was handled correctly,
528 * -1 if Hello message was not handle correctly.
530 static int emulateOrgFreedesktopDBus(DBusTransport *transport, DBusMessage *message)
532 if(!strcmp(dbus_message_get_member(message), "Hello"))
536 name = malloc(snprintf(name, 0, ":1.%llu0", ULLONG_MAX));
540 if(!bus_register_kdbus(&name[3], (DBusTransportKdbus*)transport))
542 if(!register_kdbus_policy(&name[3], transport, geteuid()))
545 ((DBusTransportKdbus*)transport)->sender = name;
547 if(!reply_1_data(message, DBUS_TYPE_STRING, &name, transport->connection))
554 return 1; //send to daemon
559 #if KDBUS_MSG_DECODE_DEBUG == 1
560 static char *msg_id(uint64_t id, char *buf)
566 sprintf(buf, "%llu", (unsigned long long)id);
570 struct kdbus_enum_table {
574 #define _STRINGIFY(x) #x
575 #define STRINGIFY(x) _STRINGIFY(x)
576 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
577 #define TABLE(what) static struct kdbus_enum_table kdbus_table_##what[]
578 #define ENUM(_id) { .id=_id, .name=STRINGIFY(_id) }
579 #define LOOKUP(what) \
580 const char *enum_##what(long long id) { \
582 for (i = 0; i < ELEMENTSOF(kdbus_table_##what); i++) \
583 if (id == kdbus_table_##what[i].id) \
584 return kdbus_table_##what[i].name; \
587 const char *enum_MSG(long long id);
589 ENUM(_KDBUS_MSG_NULL),
590 ENUM(KDBUS_MSG_PAYLOAD_VEC),
591 ENUM(KDBUS_MSG_PAYLOAD_OFF),
592 ENUM(KDBUS_MSG_PAYLOAD_MEMFD),
594 ENUM(KDBUS_MSG_BLOOM),
595 ENUM(KDBUS_MSG_DST_NAME),
596 ENUM(KDBUS_MSG_SRC_CREDS),
597 ENUM(KDBUS_MSG_SRC_PID_COMM),
598 ENUM(KDBUS_MSG_SRC_TID_COMM),
599 ENUM(KDBUS_MSG_SRC_EXE),
600 ENUM(KDBUS_MSG_SRC_CMDLINE),
601 ENUM(KDBUS_MSG_SRC_CGROUP),
602 ENUM(KDBUS_MSG_SRC_CAPS),
603 ENUM(KDBUS_MSG_SRC_SECLABEL),
604 ENUM(KDBUS_MSG_SRC_AUDIT),
605 ENUM(KDBUS_MSG_SRC_NAMES),
606 ENUM(KDBUS_MSG_TIMESTAMP),
607 ENUM(KDBUS_MSG_NAME_ADD),
608 ENUM(KDBUS_MSG_NAME_REMOVE),
609 ENUM(KDBUS_MSG_NAME_CHANGE),
610 ENUM(KDBUS_MSG_ID_ADD),
611 ENUM(KDBUS_MSG_ID_REMOVE),
612 ENUM(KDBUS_MSG_REPLY_TIMEOUT),
613 ENUM(KDBUS_MSG_REPLY_DEAD),
616 const char *enum_PAYLOAD(long long id);
618 ENUM(KDBUS_PAYLOAD_KERNEL),
619 ENUM(KDBUS_PAYLOAD_DBUS1),
620 ENUM(KDBUS_PAYLOAD_GVARIANT),
625 * Finalizes locally generated DBus message
626 * and puts it into data buffer.
628 * @param message Message to load.
629 * @param data Place to load message.
630 * @returns Size of message loaded.
632 static int put_message_into_data(DBusMessage *message, char* data)
635 const DBusString *header;
636 const DBusString *body;
639 dbus_message_set_serial(message, 1);
640 dbus_message_lock (message);
641 _dbus_message_get_network_data (message, &header, &body);
642 ret_size = _dbus_string_get_length(header);
643 memcpy(data, _dbus_string_get_const_data(header), ret_size);
645 size = _dbus_string_get_length(body);
646 memcpy(data, _dbus_string_get_const_data(body), size);
653 * Calculates length of the kdbus message content (payload).
655 * @param msg kdbus message
656 * @return the length of the kdbus message's payload.
658 static int kdbus_message_size(const struct kdbus_msg* msg)
660 const struct kdbus_item *item;
663 KDBUS_PART_FOREACH(item, msg, items)
665 if (item->size <= KDBUS_PART_HEADER_SIZE)
667 _dbus_verbose(" +%s (%llu bytes) invalid data record\n", enum_MSG(item->type), item->size);
672 case KDBUS_MSG_PAYLOAD_OFF:
673 ret_size += item->vec.size;
675 case KDBUS_MSG_PAYLOAD_MEMFD:
676 ret_size += item->memfd.size;
687 * Decodes kdbus message in order to extract DBus message and puts it into received data buffer
688 * and file descriptor's buffer. Also captures kdbus error messages and kdbus kernel broadcasts
689 * and converts all of them into appropriate DBus messages.
691 * @param msg kdbus message
692 * @param data place to copy DBus message to
693 * @param kdbus_transport transport
694 * @param fds place to store file descriptors received
695 * @param n_fds place to store quantity of file descriptors received
696 * @return number of DBus message's bytes received or -1 on error
698 static int kdbus_decode_msg(const struct kdbus_msg* msg, char *data, DBusTransportKdbus* kdbus_transport, int* fds, int* n_fds)
700 const struct kdbus_item *item;
702 DBusMessage *message = NULL;
703 DBusMessageIter args;
704 const char* emptyString = "";
705 const char* pString = NULL;
706 char dbus_name[(unsigned int)(snprintf((char*)pString, 0, ":1.%llu0", ULLONG_MAX))];
707 const char* pDBusName = dbus_name;
708 #if KDBUS_MSG_DECODE_DEBUG == 1
712 #if KDBUS_MSG_DECODE_DEBUG == 1
713 _dbus_verbose("MESSAGE: %s (%llu bytes) flags=0x%llx, %s → %s, cookie=%llu, timeout=%llu\n",
714 enum_PAYLOAD(msg->payload_type), (unsigned long long) msg->size,
715 (unsigned long long) msg->flags,
716 msg_id(msg->src_id, buf), msg_id(msg->dst_id, buf),
717 (unsigned long long) msg->cookie, (unsigned long long) msg->timeout_ns);
722 KDBUS_PART_FOREACH(item, msg, items)
724 if (item->size <= KDBUS_PART_HEADER_SIZE)
726 _dbus_verbose(" +%s (%llu bytes) invalid data record\n", enum_MSG(item->type), item->size);
727 break; //??? continue (because dbus will find error) or break
732 case KDBUS_MSG_PAYLOAD_OFF:
733 memcpy(data, (char *)kdbus_transport->kdbus_mmap_ptr + item->vec.offset, item->vec.size);
734 data += item->vec.size;
735 ret_size += item->vec.size;
737 _dbus_verbose(" +%s (%llu bytes) off=%llu size=%llu\n",
738 enum_MSG(item->type), item->size,
739 (unsigned long long)item->vec.offset,
740 (unsigned long long)item->vec.size);
743 case KDBUS_MSG_PAYLOAD_MEMFD:
748 size = item->memfd.size;
749 _dbus_verbose("memfd.size : %llu\n", (unsigned long long)size);
751 buf = mmap(NULL, size, PROT_READ , MAP_SHARED, item->memfd.fd, 0);
752 if (buf == MAP_FAILED)
754 _dbus_verbose("mmap() fd=%i failed:%m", item->memfd.fd);
758 memcpy(data, buf, size);
764 _dbus_verbose(" +%s (%llu bytes) off=%llu size=%llu\n",
765 enum_MSG(item->type), item->size,
766 (unsigned long long)item->vec.offset,
767 (unsigned long long)item->vec.size);
775 *n_fds = (item->size - KDBUS_PART_HEADER_SIZE) / sizeof(int);
776 memcpy(fds, item->fds, *n_fds * sizeof(int));
777 for (i = 0; i < *n_fds; i++)
778 _dbus_fd_set_close_on_exec(fds[i]);
782 #if KDBUS_MSG_DECODE_DEBUG == 1
783 case KDBUS_MSG_SRC_CREDS:
784 _dbus_verbose(" +%s (%llu bytes) uid=%lld, gid=%lld, pid=%lld, tid=%lld, starttime=%lld\n",
785 enum_MSG(item->type), item->size,
786 item->creds.uid, item->creds.gid,
787 item->creds.pid, item->creds.tid,
788 item->creds.starttime);
791 case KDBUS_MSG_SRC_PID_COMM:
792 case KDBUS_MSG_SRC_TID_COMM:
793 case KDBUS_MSG_SRC_EXE:
794 case KDBUS_MSG_SRC_CGROUP:
795 case KDBUS_MSG_SRC_SECLABEL:
796 case KDBUS_MSG_DST_NAME:
797 _dbus_verbose(" +%s (%llu bytes) '%s' (%zu)\n",
798 enum_MSG(item->type), item->size, item->str, strlen(item->str));
801 case KDBUS_MSG_SRC_CMDLINE:
802 case KDBUS_MSG_SRC_NAMES: {
803 __u64 size = item->size - KDBUS_PART_HEADER_SIZE;
804 const char *str = item->str;
807 _dbus_verbose(" +%s (%llu bytes) ", enum_MSG(item->type), item->size);
809 _dbus_verbose("'%s' ", str);
810 size -= strlen(str) + 1;
811 str += strlen(str) + 1;
815 _dbus_verbose("(%d string%s)\n", count, (count == 1) ? "" : "s");
819 case KDBUS_MSG_SRC_AUDIT:
820 _dbus_verbose(" +%s (%llu bytes) loginuid=%llu sessionid=%llu\n",
821 enum_MSG(item->type), item->size,
822 (unsigned long long)item->data64[0],
823 (unsigned long long)item->data64[1]);
826 case KDBUS_MSG_SRC_CAPS: {
831 _dbus_verbose(" +%s (%llu bytes) len=%llu bytes)\n",
832 enum_MSG(item->type), item->size,
833 (unsigned long long)item->size - KDBUS_PART_HEADER_SIZE);
836 n = (item->size - KDBUS_PART_HEADER_SIZE) / 4 / sizeof(uint32_t);
838 _dbus_verbose(" CapInh=");
839 for (i = 0; i < n; i++)
840 _dbus_verbose("%08x", cap[(0 * n) + (n - i - 1)]);
842 _dbus_verbose(" CapPrm=");
843 for (i = 0; i < n; i++)
844 _dbus_verbose("%08x", cap[(1 * n) + (n - i - 1)]);
846 _dbus_verbose(" CapEff=");
847 for (i = 0; i < n; i++)
848 _dbus_verbose("%08x", cap[(2 * n) + (n - i - 1)]);
850 _dbus_verbose(" CapInh=");
851 for (i = 0; i < n; i++)
852 _dbus_verbose("%08x", cap[(3 * n) + (n - i - 1)]);
857 case KDBUS_MSG_TIMESTAMP:
858 _dbus_verbose(" +%s (%llu bytes) realtime=%lluns monotonic=%lluns\n",
859 enum_MSG(item->type), item->size,
860 (unsigned long long)item->timestamp.realtime_ns,
861 (unsigned long long)item->timestamp.monotonic_ns);
865 case KDBUS_MSG_REPLY_TIMEOUT:
866 _dbus_verbose(" +%s (%llu bytes) cookie=%llu\n",
867 enum_MSG(item->type), item->size, msg->cookie_reply);
869 message = generate_local_error_message(msg->cookie_reply, DBUS_ERROR_NO_REPLY, NULL);
876 ret_size = put_message_into_data(message, data);
879 case KDBUS_MSG_REPLY_DEAD:
880 _dbus_verbose(" +%s (%llu bytes) cookie=%llu\n",
881 enum_MSG(item->type), item->size, msg->cookie_reply);
883 message = generate_local_error_message(msg->cookie_reply, DBUS_ERROR_NAME_HAS_NO_OWNER, NULL);
890 ret_size = put_message_into_data(message, data);
893 case KDBUS_MSG_NAME_ADD:
894 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
895 enum_MSG(item->type), (unsigned long long) item->size,
896 item->name_change.name, item->name_change.old_id,
897 item->name_change.new_id, item->name_change.flags);
899 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
906 sprintf(dbus_name,":1.%llu",item->name_change.new_id);
907 pString = item->name_change.name;
908 _dbus_verbose ("Name added: %s\n", pString);
909 dbus_message_iter_init_append(message, &args);
910 ITER_APPEND_STR(pString)
911 ITER_APPEND_STR(emptyString)
912 ITER_APPEND_STR(pDBusName)
913 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
915 ret_size = put_message_into_data(message, data);
918 case KDBUS_MSG_NAME_REMOVE:
919 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
920 enum_MSG(item->type), (unsigned long long) item->size,
921 item->name_change.name, item->name_change.old_id,
922 item->name_change.new_id, item->name_change.flags);
924 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged"); // name of the signal
931 sprintf(dbus_name,":1.%llu",item->name_change.old_id);
932 pString = item->name_change.name;
933 _dbus_verbose ("Name removed: %s\n", pString);
934 dbus_message_iter_init_append(message, &args);
935 ITER_APPEND_STR(pString)
936 ITER_APPEND_STR(pDBusName)
937 ITER_APPEND_STR(emptyString)
938 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
940 ret_size = put_message_into_data(message, data);
943 case KDBUS_MSG_NAME_CHANGE:
944 _dbus_verbose(" +%s (%llu bytes) '%s', old id=%lld, new id=%lld, flags=0x%llx\n",
945 enum_MSG(item->type), (unsigned long long) item->size,
946 item->name_change.name, item->name_change.old_id,
947 item->name_change.new_id, item->name_change.flags);
949 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
956 sprintf(dbus_name,":1.%llu",item->name_change.old_id);
957 pString = item->name_change.name;
958 _dbus_verbose ("Name changed: %s\n", pString);
959 dbus_message_iter_init_append(message, &args);
960 ITER_APPEND_STR(pString)
961 ITER_APPEND_STR(pDBusName)
962 sprintf(&dbus_name[3],"%llu",item->name_change.new_id);
963 _dbus_verbose ("New id: %s\n", pDBusName);
964 ITER_APPEND_STR(pDBusName)
965 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
967 ret_size = put_message_into_data(message, data);
970 case KDBUS_MSG_ID_ADD:
971 _dbus_verbose(" +%s (%llu bytes) id=%llu flags=%llu\n",
972 enum_MSG(item->type), (unsigned long long) item->size,
973 (unsigned long long) item->id_change.id,
974 (unsigned long long) item->id_change.flags);
976 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
983 sprintf(dbus_name,":1.%llu",item->id_change.id);
984 dbus_message_iter_init_append(message, &args);
985 ITER_APPEND_STR(pDBusName)
986 ITER_APPEND_STR(emptyString)
987 ITER_APPEND_STR(pDBusName)
988 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
990 ret_size = put_message_into_data(message, data);
993 case KDBUS_MSG_ID_REMOVE:
994 _dbus_verbose(" +%s (%llu bytes) id=%llu flags=%llu\n",
995 enum_MSG(item->type), (unsigned long long) item->size,
996 (unsigned long long) item->id_change.id,
997 (unsigned long long) item->id_change.flags);
999 message = dbus_message_new_signal(DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "NameOwnerChanged");
1006 sprintf(dbus_name,":1.%llu",item->id_change.id);
1007 dbus_message_iter_init_append(message, &args);
1008 ITER_APPEND_STR(pDBusName)
1009 ITER_APPEND_STR(pDBusName)
1010 ITER_APPEND_STR(emptyString)
1011 dbus_message_set_sender(message, DBUS_SERVICE_DBUS);
1013 ret_size = put_message_into_data(message, data);
1015 #if KDBUS_MSG_DECODE_DEBUG == 1
1017 _dbus_verbose(" +%s (%llu bytes)\n", enum_MSG(item->type), item->size);
1023 #if KDBUS_MSG_DECODE_DEBUG == 1
1025 if ((char *)item - ((char *)msg + msg->size) >= 8)
1026 _dbus_verbose("invalid padding at end of message\n");
1031 dbus_message_unref(message);
1036 * Reads message from kdbus and puts it into DBus buffers
1038 * @param kdbus_transport transport
1039 * @param buffer place to copy received message to
1040 * @param fds place to store file descriptors received with the message
1041 * @param n_fds place to store quantity of file descriptors received
1042 * @return size of received message on success, -1 on error
1044 static int kdbus_read_message(DBusTransportKdbus *kdbus_transport, DBusString *buffer, int* fds, int* n_fds)
1046 int ret_size, buf_size;
1047 uint64_t __attribute__ ((__aligned__(8))) offset;
1048 struct kdbus_msg *msg;
1052 start = _dbus_string_get_length (buffer);
1055 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MSG_RECV, &offset) < 0)
1059 _dbus_verbose("kdbus error receiving message: %d (%m)\n", errno);
1060 _dbus_string_set_length (buffer, start);
1064 msg = (struct kdbus_msg *)((char*)kdbus_transport->kdbus_mmap_ptr + offset);
1066 buf_size = kdbus_message_size(msg);
1069 _dbus_verbose("kdbus error - too short message: %d (%m)\n", errno);
1073 /* What is the maximum size of the locally generated message?
1074 I just assume 2048 bytes */
1075 buf_size = MAX(buf_size, 2048);
1077 if (!_dbus_string_lengthen (buffer, buf_size))
1082 data = _dbus_string_get_data_len (buffer, start, buf_size);
1084 ret_size = kdbus_decode_msg(msg, data, kdbus_transport, fds, n_fds);
1086 if(ret_size == -1) /* error */
1088 _dbus_string_set_length (buffer, start);
1091 else if (buf_size != ret_size) /* case of locally generated message */
1093 _dbus_string_set_length (buffer, start + ret_size);
1097 if (ioctl(kdbus_transport->fd, KDBUS_CMD_MSG_RELEASE, &offset) < 0)
1101 _dbus_verbose("kdbus error freeing message: %d (%m)\n", errno);
1109 * Copy-paste from socket transport. Only renames done.
1112 free_watches (DBusTransport *transport)
1114 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1116 _dbus_verbose ("start\n");
1118 if (kdbus_transport->read_watch)
1120 if (transport->connection)
1121 _dbus_connection_remove_watch_unlocked (transport->connection,
1122 kdbus_transport->read_watch);
1123 _dbus_watch_invalidate (kdbus_transport->read_watch);
1124 _dbus_watch_unref (kdbus_transport->read_watch);
1125 kdbus_transport->read_watch = NULL;
1128 if (kdbus_transport->write_watch)
1130 if (transport->connection)
1131 _dbus_connection_remove_watch_unlocked (transport->connection,
1132 kdbus_transport->write_watch);
1133 _dbus_watch_invalidate (kdbus_transport->write_watch);
1134 _dbus_watch_unref (kdbus_transport->write_watch);
1135 kdbus_transport->write_watch = NULL;
1138 _dbus_verbose ("end\n");
1142 * Copy-paste from socket transport. Only done needed renames and removed
1143 * lines related to encoded messages.
1146 transport_finalize (DBusTransport *transport)
1148 _dbus_verbose ("\n");
1150 free_watches (transport);
1152 _dbus_transport_finalize_base (transport);
1154 _dbus_assert (((DBusTransportKdbus*) transport)->read_watch == NULL);
1155 _dbus_assert (((DBusTransportKdbus*) transport)->write_watch == NULL);
1157 dbus_free (transport);
1161 * Copy-paste from socket transport. Removed code related to authentication,
1162 * socket_transport replaced by kdbus_transport.
1165 check_write_watch (DBusTransport *transport)
1167 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1170 if (transport->connection == NULL)
1173 if (transport->disconnected)
1175 _dbus_assert (kdbus_transport->write_watch == NULL);
1179 _dbus_transport_ref (transport);
1181 needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
1183 _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
1184 needed, transport->connection, kdbus_transport->write_watch,
1185 kdbus_transport->fd,
1186 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
1188 _dbus_connection_toggle_watch_unlocked (transport->connection,
1189 kdbus_transport->write_watch,
1192 _dbus_transport_unref (transport);
1196 * Copy-paste from socket transport. Removed code related to authentication,
1197 * socket_transport replaced by kdbus_transport.
1200 check_read_watch (DBusTransport *transport)
1202 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1203 dbus_bool_t need_read_watch;
1205 _dbus_verbose ("fd = %d\n",kdbus_transport->fd);
1207 if (transport->connection == NULL)
1210 if (transport->disconnected)
1212 _dbus_assert (kdbus_transport->read_watch == NULL);
1216 _dbus_transport_ref (transport);
1219 (_dbus_counter_get_size_value (transport->live_messages) < transport->max_live_messages_size) &&
1220 (_dbus_counter_get_unix_fd_value (transport->live_messages) < transport->max_live_messages_unix_fds);
1222 _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
1223 _dbus_connection_toggle_watch_unlocked (transport->connection,
1224 kdbus_transport->read_watch,
1227 _dbus_transport_unref (transport);
1231 * Copy-paste from socket transport.
1234 do_io_error (DBusTransport *transport)
1236 _dbus_transport_ref (transport);
1237 _dbus_transport_disconnect (transport);
1238 _dbus_transport_unref (transport);
1242 * Based on do_writing from socket transport.
1243 * Removed authentication code and code related to encoded messages
1244 * and adapted to kdbus transport.
1245 * In socket transport returns false on out-of-memory. Here this won't happen,
1246 * so it always returns TRUE.
1249 do_writing (DBusTransport *transport)
1251 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1254 if (transport->disconnected)
1256 _dbus_verbose ("Not connected, not writing anything\n");
1260 _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
1261 _dbus_connection_has_messages_to_send_unlocked (transport->connection),
1262 kdbus_transport->fd);
1264 while (!transport->disconnected && _dbus_connection_has_messages_to_send_unlocked (transport->connection))
1267 DBusMessage *message;
1268 const DBusString *header;
1269 const DBusString *body;
1270 int total_bytes_to_write;
1271 const char* pDestination;
1273 if (total > kdbus_transport->max_bytes_written_per_iteration)
1275 _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
1276 total, kdbus_transport->max_bytes_written_per_iteration);
1280 message = _dbus_connection_get_message_to_send (transport->connection);
1281 _dbus_assert (message != NULL);
1282 if(dbus_message_get_sender(message) == NULL) //needed for daemon to pass pending activation messages
1284 dbus_message_unlock(message);
1285 dbus_message_set_sender(message, kdbus_transport->sender);
1286 dbus_message_lock (message);
1288 _dbus_message_get_network_data (message, &header, &body);
1289 total_bytes_to_write = _dbus_string_get_length(header) + _dbus_string_get_length(body);
1290 pDestination = dbus_message_get_destination(message);
1294 if(!strcmp(pDestination, DBUS_SERVICE_DBUS))
1296 if(!strcmp(dbus_message_get_interface(message), DBUS_INTERFACE_DBUS))
1300 ret = emulateOrgFreedesktopDBus(transport, message);
1308 bytes_written = total_bytes_to_write;
1311 //else send to "daemon" as to normal recipient
1316 bytes_written = kdbus_write_msg(kdbus_transport, message, pDestination);
1319 if (bytes_written < 0)
1321 /* EINTR already handled for us */
1323 /* For some discussion of why we also ignore EPIPE here, see
1324 * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html
1327 if (_dbus_get_is_errno_eagain_or_ewouldblock () || _dbus_get_is_errno_epipe ())
1331 _dbus_verbose ("Error writing to remote app: %s\n", _dbus_strerror_from_errno ());
1332 do_io_error (transport);
1338 _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
1339 total_bytes_to_write);
1341 total += bytes_written;
1343 _dbus_assert (bytes_written == total_bytes_to_write);
1345 _dbus_connection_message_sent_unlocked (transport->connection,
1355 * Based on do_reading from socket transport.
1356 * Removed authentication code and code related to encoded messages
1357 * and adapted to kdbus transport.
1358 * returns false on out-of-memory
1361 do_reading (DBusTransport *transport)
1363 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1366 dbus_bool_t oom = FALSE;
1370 _dbus_verbose ("fd = %d\n",kdbus_transport->fd);
1374 /* See if we've exceeded max messages and need to disable reading */
1375 check_read_watch (transport);
1377 if (total > kdbus_transport->max_bytes_read_per_iteration)
1379 _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
1380 total, kdbus_transport->max_bytes_read_per_iteration);
1384 _dbus_assert (kdbus_transport->read_watch != NULL ||
1385 transport->disconnected);
1387 if (transport->disconnected)
1390 if (!dbus_watch_get_enabled (kdbus_transport->read_watch))
1393 if (!_dbus_message_loader_get_unix_fds(transport->loader, &fds, &n_fds))
1395 _dbus_verbose ("Out of memory reading file descriptors\n");
1399 _dbus_message_loader_get_buffer (transport->loader, &buffer);
1401 bytes_read = kdbus_read_message(kdbus_transport, buffer, fds, &n_fds);
1403 if (bytes_read >= 0 && n_fds > 0)
1404 _dbus_verbose("Read %i unix fds\n", n_fds);
1406 _dbus_message_loader_return_buffer (transport->loader,
1408 bytes_read < 0 ? 0 : bytes_read);
1409 _dbus_message_loader_return_unix_fds(transport->loader, fds, bytes_read < 0 ? 0 : n_fds);
1413 /* EINTR already handled for us */
1415 if (_dbus_get_is_errno_enomem ())
1417 _dbus_verbose ("Out of memory in read()/do_reading()\n");
1421 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
1425 _dbus_verbose ("Error reading from remote app: %s\n",
1426 _dbus_strerror_from_errno ());
1427 do_io_error (transport);
1431 else if (bytes_read == 0)
1433 _dbus_verbose ("Disconnected from remote app\n");
1434 do_io_error (transport);
1439 _dbus_verbose (" read %d bytes\n", bytes_read);
1441 total += bytes_read;
1443 if (!_dbus_transport_queue_messages (transport))
1446 _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
1450 /* Try reading more data until we get EAGAIN and return, or
1451 * exceed max bytes per iteration. If in blocking mode of
1452 * course we'll block instead of returning.
1464 * Copy-paste from socket transport, with socket replaced by kdbus.
1467 unix_error_with_read_to_come (DBusTransport *itransport,
1471 DBusTransportKdbus *transport = (DBusTransportKdbus *) itransport;
1473 if (!((flags & DBUS_WATCH_HANGUP) || (flags & DBUS_WATCH_ERROR)))
1476 /* If we have a read watch enabled ...
1477 we -might have data incoming ... => handle the HANGUP there */
1478 if (watch != transport->read_watch && _dbus_watch_get_enabled (transport->read_watch))
1485 * Copy-paste from socket transport. Removed authentication related code
1486 * and renamed socket_transport to kdbus_transport.
1489 kdbus_handle_watch (DBusTransport *transport,
1493 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1495 _dbus_assert (watch == kdbus_transport->read_watch ||
1496 watch == kdbus_transport->write_watch);
1497 _dbus_assert (watch != NULL);
1499 /* If we hit an error here on a write watch, don't disconnect the transport yet because data can
1500 * still be in the buffer and do_reading may need several iteration to read
1501 * it all (because of its max_bytes_read_per_iteration limit).
1503 if (!(flags & DBUS_WATCH_READABLE) && unix_error_with_read_to_come (transport, watch, flags))
1505 _dbus_verbose ("Hang up or error on watch\n");
1506 _dbus_transport_disconnect (transport);
1510 if (watch == kdbus_transport->read_watch &&
1511 (flags & DBUS_WATCH_READABLE))
1513 _dbus_verbose ("handling read watch %p flags = %x\n",
1516 if (!do_reading (transport))
1518 _dbus_verbose ("no memory to read\n");
1523 else if (watch == kdbus_transport->write_watch &&
1524 (flags & DBUS_WATCH_WRITABLE))
1526 _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
1527 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
1529 if (!do_writing (transport))
1531 _dbus_verbose ("no memory to write\n");
1535 /* See if we still need the write watch */
1536 check_write_watch (transport);
1543 * Copy-paste from socket transport renamed to kdbus_transport.
1546 kdbus_disconnect (DBusTransport *transport)
1548 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1550 _dbus_verbose ("\n");
1552 free_watches (transport);
1554 _dbus_close_socket (kdbus_transport->fd, NULL);
1555 kdbus_transport->fd = -1;
1559 * Copy-paste from socket transport. Renamed socket_transport to
1560 * kdbus_transport and added dbus_connection_set_is_authenticated, because
1561 * we do not perform authentication in kdbus, so we have mark is as already done
1562 * to make everything work.
1565 kdbus_connection_set (DBusTransport *transport)
1567 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1569 dbus_connection_set_is_authenticated(transport->connection); //now we don't have authentication in kdbus, so mark it done
1571 _dbus_watch_set_handler (kdbus_transport->write_watch,
1572 _dbus_connection_handle_watch,
1573 transport->connection, NULL);
1575 _dbus_watch_set_handler (kdbus_transport->read_watch,
1576 _dbus_connection_handle_watch,
1577 transport->connection, NULL);
1579 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1580 kdbus_transport->write_watch))
1583 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1584 kdbus_transport->read_watch))
1586 _dbus_connection_remove_watch_unlocked (transport->connection,
1587 kdbus_transport->write_watch);
1591 check_read_watch (transport);
1592 check_write_watch (transport);
1598 * Copy-paste from socket_transport.
1599 * Socket_transport renamed to kdbus_transport
1601 * Original dbus copy-pasted @todo comment below.
1602 * @todo We need to have a way to wake up the select sleep if
1603 * a new iteration request comes in with a flag (read/write) that
1604 * we're not currently serving. Otherwise a call that just reads
1605 * could block a write call forever (if there are no incoming
1609 kdbus_do_iteration (DBusTransport *transport,
1611 int timeout_milliseconds)
1613 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1618 _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
1619 flags & DBUS_ITERATION_DO_READING ? "read" : "",
1620 flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
1621 timeout_milliseconds,
1622 kdbus_transport->read_watch,
1623 kdbus_transport->write_watch,
1624 kdbus_transport->fd);
1626 /* the passed in DO_READING/DO_WRITING flags indicate whether to
1627 * read/write messages, but regardless of those we may need to block
1628 * for reading/writing to do auth. But if we do reading for auth,
1629 * we don't want to read any messages yet if not given DO_READING.
1632 poll_fd.fd = kdbus_transport->fd;
1635 if (_dbus_transport_try_to_authenticate (transport))
1637 /* This is kind of a hack; if we have stuff to write, then try
1638 * to avoid the poll. This is probably about a 5% speedup on an
1639 * echo client/server.
1641 * If both reading and writing were requested, we want to avoid this
1642 * since it could have funky effects:
1643 * - both ends spinning waiting for the other one to read
1644 * data so they can finish writing
1645 * - prioritizing all writing ahead of reading
1647 if ((flags & DBUS_ITERATION_DO_WRITING) &&
1648 !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
1649 !transport->disconnected &&
1650 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
1652 do_writing (transport);
1654 if (transport->disconnected ||
1655 !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
1659 /* If we get here, we decided to do the poll() after all */
1660 _dbus_assert (kdbus_transport->read_watch);
1661 if (flags & DBUS_ITERATION_DO_READING)
1662 poll_fd.events |= _DBUS_POLLIN;
1664 _dbus_assert (kdbus_transport->write_watch);
1665 if (flags & DBUS_ITERATION_DO_WRITING)
1666 poll_fd.events |= _DBUS_POLLOUT;
1670 DBusAuthState auth_state;
1672 auth_state = _dbus_auth_do_work (transport->auth);
1674 if (transport->receive_credentials_pending || auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1675 poll_fd.events |= _DBUS_POLLIN;
1677 if (transport->send_credentials_pending || auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1678 poll_fd.events |= _DBUS_POLLOUT;
1683 if (flags & DBUS_ITERATION_BLOCK)
1684 poll_timeout = timeout_milliseconds;
1688 /* For blocking selects we drop the connection lock here
1689 * to avoid blocking out connection access during a potentially
1690 * indefinite blocking call. The io path is still protected
1691 * by the io_path_cond condvar, so we won't reenter this.
1693 if (flags & DBUS_ITERATION_BLOCK)
1695 _dbus_verbose ("unlock pre poll\n");
1696 _dbus_connection_unlock (transport->connection);
1700 poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1702 if (poll_res < 0 && _dbus_get_is_errno_eintr ())
1704 _dbus_verbose ("Error from _dbus_poll(): %s\n", _dbus_strerror_from_errno ());
1708 if (flags & DBUS_ITERATION_BLOCK)
1710 _dbus_verbose ("lock post poll\n");
1711 _dbus_connection_lock (transport->connection);
1717 poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1718 * valgrind flags it as an error. though it probably
1719 * is guaranteed on linux at least.
1722 if (poll_fd.revents & _DBUS_POLLERR)
1723 do_io_error (transport);
1726 dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1727 dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1729 _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1730 need_read, need_write);
1732 if (need_read && (flags & DBUS_ITERATION_DO_READING))
1733 do_reading (transport);
1734 if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1735 do_writing (transport);
1739 _dbus_verbose ("Error from _dbus_poll(): %s\n", _dbus_strerror_from_errno ());
1743 /* We need to install the write watch only if we did not
1744 * successfully write everything. Note we need to be careful that we
1745 * don't call check_write_watch *before* do_writing, since it's
1746 * inefficient to add the write watch, and we can avoid it most of
1747 * the time since we can write immediately.
1749 * However, we MUST always call check_write_watch(); DBusConnection code
1750 * relies on the fact that running an iteration will notice that
1751 * messages are pending.
1753 check_write_watch (transport);
1755 _dbus_verbose (" ... leaving do_iteration()\n");
1759 * Copy-paste from socket transport.
1762 kdbus_live_messages_changed (DBusTransport *transport)
1764 /* See if we should look for incoming messages again */
1765 check_read_watch (transport);
1769 * Gets file descriptor of the kdbus bus.
1770 * @param transport transport
1771 * @param fd_p place to write fd to
1772 * @returns always TRUE
1775 kdbus_get_kdbus_fd (DBusTransport *transport,
1778 DBusTransportKdbus *kdbus_transport = (DBusTransportKdbus*) transport;
1780 *fd_p = kdbus_transport->fd;
1785 static const DBusTransportVTable kdbus_vtable = {
1789 kdbus_connection_set,
1791 kdbus_live_messages_changed,
1796 * Copy-paste from dbus_transport_socket with needed changes.
1798 * Creates a new transport for the given kdbus file descriptor and address.
1799 * The file descriptor must be nonblocking.
1801 * @param fd the file descriptor.
1802 * @param address the transport's address
1803 * @returns the new transport, or #NULL if no memory.
1805 static DBusTransport*
1806 _dbus_transport_new_kdbus_transport (int fd, const DBusString *address)
1808 DBusTransportKdbus *kdbus_transport;
1810 kdbus_transport = dbus_new0 (DBusTransportKdbus, 1);
1811 if (kdbus_transport == NULL)
1814 kdbus_transport->write_watch = _dbus_watch_new (fd,
1815 DBUS_WATCH_WRITABLE,
1818 if (kdbus_transport->write_watch == NULL)
1821 kdbus_transport->read_watch = _dbus_watch_new (fd,
1822 DBUS_WATCH_READABLE,
1825 if (kdbus_transport->read_watch == NULL)
1828 if (!_dbus_transport_init_base (&kdbus_transport->base,
1833 kdbus_transport->fd = fd;
1835 /* These values should probably be tunable or something. */
1836 kdbus_transport->max_bytes_read_per_iteration = 16384;
1837 kdbus_transport->max_bytes_written_per_iteration = 16384;
1839 kdbus_transport->kdbus_mmap_ptr = NULL;
1840 kdbus_transport->memfd = -1;
1842 return (DBusTransport*) kdbus_transport;
1845 _dbus_watch_invalidate (kdbus_transport->read_watch);
1846 _dbus_watch_unref (kdbus_transport->read_watch);
1848 _dbus_watch_invalidate (kdbus_transport->write_watch);
1849 _dbus_watch_unref (kdbus_transport->write_watch);
1851 dbus_free (kdbus_transport);
1856 * Opens a connection to the kdbus bus
1858 * @param path the path to kdbus bus
1859 * @param error return location for error code
1860 * @returns connection file descriptor or -1 on error
1862 static int _dbus_connect_kdbus (const char *path, DBusError *error)
1866 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1867 _dbus_verbose ("connecting to kdbus bus %s\n", path);
1869 fd = open(path, O_RDWR|O_CLOEXEC|O_NONBLOCK);
1871 dbus_set_error(error, _dbus_error_from_errno (errno), "Failed to open file descriptor: %s", _dbus_strerror (errno));
1877 * Connects to kdbus, creates and sets-up transport.
1879 * @param path the path to the bus.
1880 * @param error address where an error can be returned.
1881 * @returns a new transport, or #NULL on failure.
1883 static DBusTransport* _dbus_transport_new_for_kdbus (const char *path, DBusError *error)
1886 DBusTransport *transport;
1889 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1891 if (!_dbus_string_init (&address))
1893 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1899 if ((!_dbus_string_append (&address, "kdbus:path=")) || (!_dbus_string_append (&address, path)))
1901 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1905 fd = _dbus_connect_kdbus (path, error);
1908 _DBUS_ASSERT_ERROR_IS_SET (error);
1912 _dbus_verbose ("Successfully connected to kdbus bus %s\n", path);
1914 transport = _dbus_transport_new_kdbus_transport (fd, &address);
1915 if (transport == NULL)
1917 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1921 _dbus_string_free (&address);
1926 _dbus_close_socket (fd, NULL);
1928 _dbus_string_free (&address);
1934 * Opens kdbus transport if method from address entry is kdbus
1936 * @param entry the address entry to open
1937 * @param transport_p return location for the opened transport
1938 * @param error place to store error
1939 * @returns result of the attempt as a DBusTransportOpenResult enum
1941 DBusTransportOpenResult _dbus_transport_open_kdbus(DBusAddressEntry *entry,
1942 DBusTransport **transport_p,
1947 method = dbus_address_entry_get_method (entry);
1948 _dbus_assert (method != NULL);
1950 if (strcmp (method, "kdbus") == 0)
1952 const char *path = dbus_address_entry_get_value (entry, "path");
1956 _dbus_set_bad_address (error, "kdbus", "path", NULL);
1957 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1960 *transport_p = _dbus_transport_new_for_kdbus (path, error);
1962 if (*transport_p == NULL)
1964 _DBUS_ASSERT_ERROR_IS_SET (error);
1965 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1969 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1970 return DBUS_TRANSPORT_OPEN_OK;
1975 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1976 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;