diff options
Diffstat (limited to 'src/libsystemd-bus/bus-kernel.c')
| -rw-r--r-- | src/libsystemd-bus/bus-kernel.c | 1345 |
1 files changed, 0 insertions, 1345 deletions
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c deleted file mode 100644 index e8f4c58110..0000000000 --- a/src/libsystemd-bus/bus-kernel.c +++ /dev/null @@ -1,1345 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2013 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#ifdef HAVE_VALGRIND_MEMCHECK_H -#include <valgrind/memcheck.h> -#endif - -#include <fcntl.h> -#include <malloc.h> -#include <sys/mman.h> - -#include "util.h" -#include "strv.h" - -#include "bus-internal.h" -#include "bus-message.h" -#include "bus-kernel.h" -#include "bus-bloom.h" -#include "bus-util.h" -#include "cgroup-util.h" - -#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) - -int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { - int r; - - assert(s); - assert(id); - - if (!startswith(s, ":1.")) - return 0; - - r = safe_atou64(s + 3, id); - if (r < 0) - return r; - - return 1; -} - -static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { - assert(d); - assert(sz > 0); - - *d = ALIGN8_PTR(*d); - - /* Note that p can be NULL, which encodes a region full of - * zeroes, which is useful to optimize certain padding - * conditions */ - - (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); - (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; - (*d)->vec.address = PTR_TO_UINT64(p); - (*d)->vec.size = sz; - - *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); -} - -static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { - assert(d); - assert(memfd >= 0); - assert(sz > 0); - - *d = ALIGN8_PTR(*d); - (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); - (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; - (*d)->memfd.fd = memfd; - (*d)->memfd.size = sz; - - *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); -} - -static void append_destination(struct kdbus_item **d, const char *s, size_t length) { - assert(d); - assert(s); - - *d = ALIGN8_PTR(*d); - - (*d)->size = offsetof(struct kdbus_item, str) + length + 1; - (*d)->type = KDBUS_ITEM_DST_NAME; - memcpy((*d)->str, s, length + 1); - - *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); -} - -static void* append_bloom(struct kdbus_item **d, size_t length) { - void *r; - - assert(d); - - *d = ALIGN8_PTR(*d); - - (*d)->size = offsetof(struct kdbus_item, data) + length; - (*d)->type = KDBUS_ITEM_BLOOM; - r = (*d)->data; - - *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); - - return r; -} - -static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { - assert(d); - assert(fds); - assert(n_fds > 0); - - *d = ALIGN8_PTR(*d); - (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; - (*d)->type = KDBUS_ITEM_FDS; - memcpy((*d)->fds, fds, sizeof(int) * n_fds); - - *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); -} - -static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) { - unsigned i; - int r; - - assert(m); - assert(bloom); - - memset(bloom, 0, BLOOM_SIZE); - - bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type)); - - if (m->interface) - bloom_add_pair(bloom, "interface", m->interface); - if (m->member) - bloom_add_pair(bloom, "member", m->member); - if (m->path) { - bloom_add_pair(bloom, "path", m->path); - bloom_add_pair(bloom, "path-slash-prefix", m->path); - bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/'); - } - - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - for (i = 0; i < 64; i++) { - char type; - const char *t; - char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; - char *e; - - r = sd_bus_message_peek_type(m, &type, NULL); - if (r < 0) - return r; - - if (type != SD_BUS_TYPE_STRING && - type != SD_BUS_TYPE_OBJECT_PATH && - type != SD_BUS_TYPE_SIGNATURE) - break; - - r = sd_bus_message_read_basic(m, type, &t); - if (r < 0) - return r; - - e = stpcpy(buf, "arg"); - if (i < 10) - *(e++) = '0' + (char) i; - else { - *(e++) = '0' + (char) (i / 10); - *(e++) = '0' + (char) (i % 10); - } - - *e = 0; - bloom_add_pair(bloom, buf, t); - - strcpy(e, "-dot-prefix"); - bloom_add_prefixes(bloom, buf, t, '.'); - strcpy(e, "-slash-prefix"); - bloom_add_prefixes(bloom, buf, t, '/'); - } - - return 0; -} - -static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { - struct bus_body_part *part; - struct kdbus_item *d; - bool well_known; - uint64_t unique; - size_t sz, dl; - unsigned i; - int r; - - assert(b); - assert(m); - assert(m->sealed); - - if (m->kdbus) - return 0; - - if (m->destination) { - r = bus_kernel_parse_unique_name(m->destination, &unique); - if (r < 0) - return r; - - well_known = r == 0; - } else - well_known = false; - - sz = offsetof(struct kdbus_msg, items); - - assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == - ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); - - /* Add in fixed header, fields header and payload */ - sz += (1 + m->n_body_parts) * - ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); - - /* Add space for bloom filter */ - sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE); - - /* Add in well-known destination header */ - if (well_known) { - dl = strlen(m->destination); - sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); - } - - /* Add space for unix fds */ - if (m->n_fds > 0) - sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); - - m->kdbus = memalign(8, sz); - if (!m->kdbus) { - r = -ENOMEM; - goto fail; - } - - m->free_kdbus = true; - memset(m->kdbus, 0, sz); - - m->kdbus->flags = - ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | - ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); - m->kdbus->dst_id = - well_known ? 0 : - m->destination ? unique : KDBUS_DST_ID_BROADCAST; - m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; - m->kdbus->cookie = m->header->serial; - - if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) - m->kdbus->cookie_reply = m->reply_cookie; - else - m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; - - d = m->kdbus->items; - - if (well_known) - append_destination(&d, m->destination, dl); - - append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); - - MESSAGE_FOREACH_PART(part, i, m) { - if (part->is_zero) { - /* If this is padding then simply send a - * vector with a NULL data pointer which the - * kernel will just pass through. This is the - * most efficient way to encode zeroes */ - - append_payload_vec(&d, NULL, part->size); - continue; - } - - if (part->memfd >= 0 && part->sealed && m->destination) { - /* Try to send a memfd, if the part is - * sealed and this is not a broadcast. Since we can only */ - - append_payload_memfd(&d, part->memfd, part->size); - continue; - } - - /* Otherwise let's send a vector to the actual data, - * for that we need to map it first. */ - r = bus_body_part_map(part); - if (r < 0) - goto fail; - - append_payload_vec(&d, part->data, part->size); - } - - if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { - void *p; - - p = append_bloom(&d, BLOOM_SIZE); - r = bus_message_setup_bloom(m, p); - if (r < 0) - goto fail; - } - - if (m->n_fds > 0) - append_fds(&d, m->fds, m->n_fds); - - m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; - assert(m->kdbus->size <= sz); - - return 0; - -fail: - m->poisoned = true; - return r; -} - -int bus_kernel_take_fd(sd_bus *b) { - struct kdbus_cmd_hello *hello; - struct kdbus_item *item; - size_t l = 0, sz; - int r; - - assert(b); - - if (b->is_server) - return -EINVAL; - - b->use_memfd = 1; - - sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)); - - if (b->fake_creds_valid) - sz += ALIGN8(offsetof(struct kdbus_item, creds)) + sizeof(struct kdbus_creds); - - if (b->fake_label) { - l = strlen(b->fake_label); - sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); - } - - hello = alloca0(sz); - hello->size = sz; - hello->conn_flags = b->hello_flags; - hello->attach_flags = b->attach_flags; - hello->pool_size = KDBUS_POOL_SIZE; - - item = hello->items; - - if (b->fake_creds_valid) { - item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); - item->type = KDBUS_ITEM_CREDS; - item->creds = b->fake_creds; - - item = KDBUS_ITEM_NEXT(item); - } - - if (b->fake_label) { - item->size = offsetof(struct kdbus_item, str) + l + 1; - memcpy(item->str, b->fake_label, l+1); - } - - r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); - if (r < 0) - return -errno; - - if (!b->kdbus_buffer) { - b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); - if (b->kdbus_buffer == MAP_FAILED) { - b->kdbus_buffer = NULL; - return -errno; - } - } - - /* The higher 32bit of both flags fields are considered - * 'incompatible flags'. Refuse them all for now. */ - if (hello->bus_flags > 0xFFFFFFFFULL || - hello->conn_flags > 0xFFFFFFFFULL) - return -ENOTSUP; - - if (hello->bloom_size != BLOOM_SIZE) - return -ENOTSUP; - - if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) - return -ENOMEM; - - b->unique_id = hello->id; - - b->is_kernel = true; - b->bus_client = true; - b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD); - b->message_version = 2; - b->message_endian = BUS_NATIVE_ENDIAN; - - /* the kernel told us the UUID of the underlying bus */ - memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); - - return bus_start_running(b); -} - -int bus_kernel_connect(sd_bus *b) { - assert(b); - assert(b->input_fd < 0); - assert(b->output_fd < 0); - assert(b->kernel); - - if (b->is_server) - return -EINVAL; - - b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (b->input_fd < 0) - return -errno; - - b->output_fd = b->input_fd; - - return bus_kernel_take_fd(b); -} - -int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m) { - int r; - - assert(bus); - assert(m); - assert(bus->state == BUS_RUNNING); - - /* If we can't deliver, we want room for the error message */ - r = bus_rqueue_make_room(bus); - if (r < 0) - return r; - - r = bus_message_setup_kmsg(bus, m); - if (r < 0) - return r; - - r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); - if (r < 0) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - sd_bus_message *reply; - - if (errno == EAGAIN || errno == EINTR) - return 0; - else if (errno == ENXIO || errno == ESRCH) { - - /* ENXIO: unique name not known - * ESRCH: well-known name not known */ - - if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) - sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); - else { - log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); - return 0; - } - - } else if (errno == EADDRNOTAVAIL) { - - /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ - - if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) - sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); - else { - log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); - return 0; - } - } else - return -errno; - - r = bus_message_new_synthetic_error( - bus, - BUS_MESSAGE_COOKIE(m), - &error, - &reply); - - if (r < 0) - return r; - - r = bus_seal_synthetic_message(bus, reply); - if (r < 0) - return r; - - bus->rqueue[bus->rqueue_size++] = reply; - - return 0; - } - - return 1; -} - -static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { - uint64_t off; - struct kdbus_item *d; - - assert(bus); - assert(k); - - off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; - ioctl(bus->input_fd, KDBUS_CMD_FREE, &off); - - KDBUS_ITEM_FOREACH(d, k, items) { - - if (d->type == KDBUS_ITEM_FDS) - close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); - else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) - close_nointr_nofail(d->memfd.fd); - } -} - -static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - assert(bus); - - r = sd_bus_message_new_signal( - bus, - "/org/freedesktop/DBus", - "org.freedesktop.DBus", - "NameOwnerChanged", - &m); - if (r < 0) - return r; - - r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); - if (r < 0) - return r; - - m->sender = "org.freedesktop.DBus"; - - r = bus_seal_synthetic_message(bus, m); - if (r < 0) - return r; - - bus->rqueue[bus->rqueue_size++] = m; - m = NULL; - - return 1; -} - -static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { - char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; - - assert(bus); - assert(k); - assert(d); - - if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) - old_owner[0] = 0; - else - sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id); - - if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { - - if (isempty(old_owner)) - return 0; - - new_owner[0] = 0; - } else - sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id); - - return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); -} - -static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { - char owner[UNIQUE_NAME_MAX]; - - assert(bus); - assert(k); - assert(d); - - sprintf(owner, ":1.%llu", d->id_change.id); - - return push_name_owner_changed( - bus, owner, - d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, - d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); -} - -static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - assert(bus); - assert(k); - assert(d); - - r = bus_message_new_synthetic_error( - bus, - k->cookie_reply, - d->type == KDBUS_ITEM_REPLY_TIMEOUT ? - &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : - &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), - &m); - if (r < 0) - return r; - - m->sender = "org.freedesktop.DBus"; - - r = bus_seal_synthetic_message(bus, m); - if (r < 0) - return r; - - bus->rqueue[bus->rqueue_size++] = m; - m = NULL; - - return 1; -} - -static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { - struct kdbus_item *d, *found = NULL; - - static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { - [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, - [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, - [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, - - [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, - [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, - - [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, - [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, - }; - - assert(bus); - assert(k); - assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); - - KDBUS_ITEM_FOREACH(d, k, items) { - if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { - if (found) - return -EBADMSG; - found = d; - } else - log_debug("Got unknown field from kernel %llu", d->type); - } - - if (!found) { - log_debug("Didn't find a kernel message to translate."); - return 0; - } - - return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); -} - -static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { - sd_bus_message *m = NULL; - struct kdbus_item *d; - unsigned n_fds = 0; - _cleanup_free_ int *fds = NULL; - struct bus_header *h = NULL; - size_t total, n_bytes = 0, idx = 0; - const char *destination = NULL, *seclabel = NULL; - int r; - - assert(bus); - assert(k); - assert(k->payload_type == KDBUS_PAYLOAD_DBUS); - - KDBUS_ITEM_FOREACH(d, k, items) { - size_t l; - - l = d->size - offsetof(struct kdbus_item, data); - - switch (d->type) { - - case KDBUS_ITEM_PAYLOAD_OFF: - if (!h) { - h = (struct bus_header *)((uint8_t *)k + d->vec.offset); - - if (!bus_header_is_complete(h, d->vec.size)) - return -EBADMSG; - } - - n_bytes += d->vec.size; - break; - - case KDBUS_ITEM_PAYLOAD_MEMFD: - if (!h) - return -EBADMSG; - - n_bytes += d->memfd.size; - break; - - case KDBUS_ITEM_FDS: { - int *f; - unsigned j; - - j = l / sizeof(int); - f = realloc(fds, sizeof(int) * (n_fds + j)); - if (!f) - return -ENOMEM; - - fds = f; - memcpy(fds + n_fds, d->fds, sizeof(int) * j); - n_fds += j; - break; - } - - case KDBUS_ITEM_SECLABEL: - seclabel = d->str; - break; - } - } - - if (!h) - return -EBADMSG; - - r = bus_header_message_size(h, &total); - if (r < 0) - return r; - - if (n_bytes != total) - return -EBADMSG; - - /* on kdbus we only speak native endian gvariant, never dbus1 - * marshalling or reverse endian */ - if (h->version != 2 || - h->endian != BUS_NATIVE_ENDIAN) - return -EPROTOTYPE; - - r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); - if (r < 0) - return r; - - /* The well-known names list is different from the other - credentials. If we asked for it, but nothing is there, this - means that the list of well-known names is simply empty, not - that we lack any data */ - - m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; - - KDBUS_ITEM_FOREACH(d, k, items) { - size_t l; - - l = d->size - offsetof(struct kdbus_item, data); - - switch (d->type) { - - case KDBUS_ITEM_PAYLOAD_OFF: { - size_t begin_body; - - begin_body = BUS_MESSAGE_BODY_BEGIN(m); - - if (idx + d->vec.size > begin_body) { - struct bus_body_part *part; - - /* Contains body material */ - - part = message_append_part(m); - if (!part) { - r = -ENOMEM; - goto fail; - } - - /* A -1 offset is NUL padding. */ - part->is_zero = d->vec.offset == ~0ULL; - - if (idx >= begin_body) { - if (!part->is_zero) - part->data = (uint8_t *)k + d->vec.offset; - part->size = d->vec.size; - } else { - if (!part->is_zero) - part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); - part->size = d->vec.size - (begin_body - idx); - } - - part->sealed = true; - } - - idx += d->vec.size; - break; - } - - case KDBUS_ITEM_PAYLOAD_MEMFD: { - struct bus_body_part *part; - - if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { - r = -EBADMSG; - goto fail; - } - - part = message_append_part(m); - if (!part) { - r = -ENOMEM; - goto fail; - } - - part->memfd = d->memfd.fd; - part->size = d->memfd.size; - part->sealed = true; - - idx += d->memfd.size; - break; - } - - case KDBUS_ITEM_CREDS: - /* UID/GID/PID are always valid */ - m->creds.uid = (uid_t) d->creds.uid; - m->creds.gid = (gid_t) d->creds.gid; - m->creds.pid = (pid_t) d->creds.pid; - m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; - - /* The PID starttime/TID might be missing - * however, when the data is faked by some - * data bus proxy and it lacks that - * information about the real client since - * SO_PEERCRED is used for that */ - - if (d->creds.starttime > 0) { - m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; - m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; - } - - if (d->creds.tid > 0) { - m->creds.tid = (pid_t) d->creds.tid; - m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; - } - break; - - case KDBUS_ITEM_TIMESTAMP: - m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; - m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; - break; - - case KDBUS_ITEM_PID_COMM: - m->creds.comm = d->str; - m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; - break; - - case KDBUS_ITEM_TID_COMM: - m->creds.tid_comm = d->str; - m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; - break; - - case KDBUS_ITEM_EXE: - m->creds.exe = d->str; - m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; - break; - - case KDBUS_ITEM_CMDLINE: - m->creds.cmdline = d->str; - m->creds.cmdline_size = l; - m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; - break; - - case KDBUS_ITEM_CGROUP: - m->creds.cgroup = d->str; - m->creds.mask |= (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID) & bus->creds_mask; - - if (!bus->cgroup_root) { - r = cg_get_root_path(&bus->cgroup_root); - if (r < 0) - goto fail; - } - - m->creds.cgroup_root = bus->cgroup_root; - - break; - - case KDBUS_ITEM_AUDIT: - m->creds.audit_session_id = (uint32_t) d->audit.sessionid; - m->creds.audit_login_uid = (uid_t) d->audit.loginuid; - m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; - break; - - case KDBUS_ITEM_CAPS: - m->creds.capability = d->data; - m->creds.capability_size = l; - m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask; - break; - - case KDBUS_ITEM_DST_NAME: - if (!service_name_is_valid(d->str)) - return -EBADMSG; - - destination = d->str; - break; - - case KDBUS_ITEM_NAME: - if (!service_name_is_valid(d->name.name)) - return -EBADMSG; - - r = strv_extend(&m->creds.well_known_names, d->name.name); - if (r < 0) - goto fail; - break; - - case KDBUS_ITEM_FDS: - case KDBUS_ITEM_SECLABEL: - break; - - default: - log_debug("Got unknown field from kernel %llu", d->type); - } - } - - r = bus_message_parse_fields(m); - if (r < 0) - goto fail; - - /* Override information from the user header with data from the kernel */ - if (k->src_id == KDBUS_SRC_ID_KERNEL) - m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; - else { - snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); - m->sender = m->creds.unique_name = m->sender_buffer; - } - - if (destination) - m->destination = destination; - else if (k->dst_id == KDBUS_DST_ID_BROADCAST) - m->destination = NULL; - else if (k->dst_id == KDBUS_DST_ID_NAME) - m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ - else { - snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); - m->destination = m->destination_buffer; - } - - /* We take possession of the kmsg struct now */ - m->kdbus = k; - m->release_kdbus = true; - m->free_fds = true; - fds = NULL; - - bus->rqueue[bus->rqueue_size++] = m; - - return 1; - -fail: - if (m) { - struct bus_body_part *part; - unsigned i; - - /* Make sure the memfds are not freed twice */ - MESSAGE_FOREACH_PART(part, i, m) - if (part->memfd >= 0) - part->memfd = -1; - - sd_bus_message_unref(m); - } - - return r; -} - -int bus_kernel_read_message(sd_bus *bus) { - struct kdbus_msg *k; - uint64_t off; - int r; - - assert(bus); - - r = bus_rqueue_make_room(bus); - if (r < 0) - return r; - - r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &off); - if (r < 0) { - if (errno == EAGAIN) - return 0; - - return -errno; - } - k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + off); - - if (k->payload_type == KDBUS_PAYLOAD_DBUS) { - r = bus_kernel_make_message(bus, k); - - /* Anybody can send us invalid messages, let's just drop them. */ - if (r == -EBADMSG || r == -EPROTOTYPE) { - log_debug("Ignoring invalid message: %s", strerror(-r)); - r = 0; - } - - } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) - r = bus_kernel_translate_message(bus, k); - else - r = 0; - - if (r <= 0) - close_kdbus_msg(bus, k); - - return r < 0 ? r : 1; -} - -int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { - struct memfd_cache *c; - int fd; - - assert(address); - assert(mapped); - assert(allocated); - - if (!bus || !bus->is_kernel) - return -ENOTSUP; - - assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); - - if (bus->n_memfd_cache <= 0) { - int r; - - assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); - - r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &fd); - if (r < 0) - return -errno; - - *address = NULL; - *mapped = 0; - *allocated = 0; - return fd; - } - - c = &bus->memfd_cache[--bus->n_memfd_cache]; - - assert(c->fd >= 0); - assert(c->mapped == 0 || c->address); - - *address = c->address; - *mapped = c->mapped; - *allocated = c->allocated; - fd = c->fd; - - assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); - - return fd; -} - -static void close_and_munmap(int fd, void *address, size_t size) { - if (size > 0) - assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); - - close_nointr_nofail(fd); -} - -void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { - struct memfd_cache *c; - uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); - - assert(fd >= 0); - assert(mapped == 0 || address); - - if (!bus || !bus->is_kernel) { - close_and_munmap(fd, address, mapped); - return; - } - - assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); - - if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { - assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); - - close_and_munmap(fd, address, mapped); - return; - } - - c = &bus->memfd_cache[bus->n_memfd_cache++]; - c->fd = fd; - c->address = address; - - /* If overly long, let's return a bit to the OS */ - if (mapped > max_mapped) { - assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0); - assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); - c->mapped = c->allocated = max_mapped; - } else { - c->mapped = mapped; - c->allocated = allocated; - } - - assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); -} - -void bus_kernel_flush_memfd(sd_bus *b) { - unsigned i; - - assert(b); - - for (i = 0; i < b->n_memfd_cache; i++) - close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); -} - -int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { - uint64_t f = 0; - - assert(kdbus_flags); - - if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) - f |= KDBUS_NAME_ALLOW_REPLACEMENT; - - if (flags & SD_BUS_NAME_REPLACE_EXISTING) - f |= KDBUS_NAME_REPLACE_EXISTING; - - if (flags & SD_BUS_NAME_QUEUE) - f |= KDBUS_NAME_QUEUE; - - *kdbus_flags = f; - return 0; -} - -int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { - uint64_t m = 0; - - assert(kdbus_mask); - - if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) - m |= KDBUS_ATTACH_CREDS; - - if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) - m |= KDBUS_ATTACH_COMM; - - if (mask & SD_BUS_CREDS_EXE) - m |= KDBUS_ATTACH_EXE; - - if (mask & SD_BUS_CREDS_CMDLINE) - m |= KDBUS_ATTACH_CMDLINE; - - if (mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID)) - m |= KDBUS_ATTACH_CGROUP; - - if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) - m |= KDBUS_ATTACH_CAPS; - - if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) - m |= KDBUS_ATTACH_SECLABEL; - - if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) - m |= KDBUS_ATTACH_AUDIT; - - if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) - m |= KDBUS_ATTACH_NAMES; - - *kdbus_mask = m; - return 0; -} - -int bus_kernel_create_bus(const char *name, bool world, char **s) { - struct kdbus_cmd_make *make; - struct kdbus_item *n; - int fd; - - assert(name); - assert(s); - - fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + - offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + - offsetof(struct kdbus_item, str) + - DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1)); - - make->size = offsetof(struct kdbus_cmd_make, items); - - n = make->items; - n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); - n->type = KDBUS_ITEM_BLOOM_SIZE; - n->data64[0] = BLOOM_SIZE; - assert_cc(BLOOM_SIZE % 8 == 0); - make->size += ALIGN8(n->size); - - n = KDBUS_ITEM_NEXT(n); - sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); - n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; - n->type = KDBUS_ITEM_MAKE_NAME; - make->size += ALIGN8(n->size); - - make->flags = KDBUS_MAKE_POLICY_OPEN | (world ? KDBUS_MAKE_ACCESS_WORLD : 0); - - if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { - close_nointr_nofail(fd); - return -errno; - } - - /* The higher 32bit of the flags field are considered - * 'incompatible flags'. Refuse them all for now. */ - if (make->flags > 0xFFFFFFFFULL) { - close_nointr_nofail(fd); - return -ENOTSUP; - } - - if (s) { - char *p; - - p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); - if (!p) { - close_nointr_nofail(fd); - return -ENOMEM; - } - - *s = p; - } - - return fd; -} - -int bus_kernel_create_starter(const char *bus, const char *name) { - struct kdbus_cmd_hello *hello; - struct kdbus_item *n; - char *p; - int fd; - - assert(bus); - assert(name); - - p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); - sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); - - fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) + - offsetof(struct kdbus_item, str) + - strlen(name) + 1)); - - n = hello->items; - strcpy(n->str, name); - n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; - n->type = KDBUS_ITEM_NAME; - - hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size); - hello->conn_flags = KDBUS_HELLO_ACTIVATOR; - hello->pool_size = KDBUS_POOL_SIZE; - - if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { - close_nointr_nofail(fd); - return -errno; - } - - /* The higher 32bit of both flags fields are considered - * 'incompatible flags'. Refuse them all for now. */ - if (hello->bus_flags > 0xFFFFFFFFULL || - hello->conn_flags > 0xFFFFFFFFULL) { - close_nointr_nofail(fd); - return -ENOTSUP; - } - - if (hello->bloom_size != BLOOM_SIZE) { - close_nointr_nofail(fd); - return -ENOTSUP; - } - - return fd; -} - -int bus_kernel_create_namespace(const char *name, char **s) { - struct kdbus_cmd_make *make; - struct kdbus_item *n; - int fd; - - assert(name); - assert(s); - - fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + - offsetof(struct kdbus_item, str) + - strlen(name) + 1)); - - n = make->items; - strcpy(n->str, name); - n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; - n->type = KDBUS_ITEM_MAKE_NAME; - - make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); - make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD; - - if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) { - close_nointr_nofail(fd); - return -errno; - } - - /* The higher 32bit of the flags field are considered - * 'incompatible flags'. Refuse them all for now. */ - if (make->flags > 0xFFFFFFFFULL) { - close_nointr_nofail(fd); - return -ENOTSUP; - } - - if (s) { - char *p; - - p = strappend("/dev/kdbus/ns/", name); - if (!p) { - close_nointr_nofail(fd); - return -ENOMEM; - } - - *s = p; - } - - return fd; -} - -int bus_kernel_create_monitor(const char *bus) { - struct kdbus_cmd_hello *hello; - char *p; - int fd; - - assert(bus); - - p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); - sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); - - fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - hello = alloca0(sizeof(struct kdbus_cmd_hello)); - hello->size = sizeof(struct kdbus_cmd_hello); - hello->conn_flags = KDBUS_HELLO_ACTIVATOR; - hello->pool_size = KDBUS_POOL_SIZE; - - if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { - close_nointr_nofail(fd); - return -errno; - } - - /* The higher 32bit of both flags fields are considered - * 'incompatible flags'. Refuse them all for now. */ - if (hello->bus_flags > 0xFFFFFFFFULL || - hello->conn_flags > 0xFFFFFFFFULL) { - close_nointr_nofail(fd); - return -ENOTSUP; - } - - return fd; -} - -int bus_kernel_try_close(sd_bus *bus) { - assert(bus); - assert(bus->is_kernel); - - if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) - return -errno; - - return 0; -} |