diff options
Diffstat (limited to 'src/libsystemd/sd-bus/bus-kernel.c')
| -rw-r--r-- | src/libsystemd/sd-bus/bus-kernel.c | 1782 |
1 files changed, 0 insertions, 1782 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c deleted file mode 100644 index 59398b841d..0000000000 --- a/src/libsystemd/sd-bus/bus-kernel.c +++ /dev/null @@ -1,1782 +0,0 @@ -/*** - 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 <sys/prctl.h> - -/* When we include libgen.h because we need dirname() we immediately - * undefine basename() since libgen.h defines it as a macro to the POSIX - * version which is really broken. We prefer GNU basename(). */ -#include <libgen.h> -#undef basename - -#include "alloc-util.h" -#include "bus-bloom.h" -#include "bus-internal.h" -#include "bus-kernel.h" -#include "bus-label.h" -#include "bus-message.h" -#include "bus-util.h" -#include "capability-util.h" -#include "fd-util.h" -#include "fileio.h" -#include "formats-util.h" -#include "memfd-util.h" -#include "parse-util.h" -#include "stdio-util.h" -#include "string-util.h" -#include "strv.h" -#include "user-util.h" -#include "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 start, 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.start = start; - (*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 struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { - struct kdbus_item *i; - - assert(d); - - i = ALIGN8_PTR(*d); - - i->size = offsetof(struct kdbus_item, bloom_filter) + - offsetof(struct kdbus_bloom_filter, data) + - length; - i->type = KDBUS_ITEM_BLOOM_FILTER; - - *d = (struct kdbus_item *) ((uint8_t*) i + i->size); - - return &i->bloom_filter; -} - -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 void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { - char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; - char *e; - - assert(data); - assert(size > 0); - assert(i < 64); - assert(t); - - 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(data, size, n_hash, buf, t); - - strcpy(e, "-dot-prefix"); - bloom_add_prefixes(data, size, n_hash, buf, t, '.'); - strcpy(e, "-slash-prefix"); - bloom_add_prefixes(data, size, n_hash, buf, t, '/'); -} - -static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { - char buf[sizeof("arg")-1 + 2 + sizeof("-has")]; - char *e; - - assert(data); - assert(size > 0); - assert(i < 64); - assert(t); - - e = stpcpy(buf, "arg"); - if (i < 10) - *(e++) = '0' + (char) i; - else { - *(e++) = '0' + (char) (i / 10); - *(e++) = '0' + (char) (i % 10); - } - - strcpy(e, "-has"); - bloom_add_pair(data, size, n_hash, buf, t); -} - -static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { - void *data; - unsigned i; - int r; - - assert(m); - assert(bloom); - - data = bloom->data; - memzero(data, m->bus->bloom_size); - bloom->generation = 0; - - bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type)); - - if (m->interface) - bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); - if (m->member) - bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); - if (m->path) { - bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); - bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); - bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); - } - - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - for (i = 0; i < 64; i++) { - const char *t, *contents; - char type; - - r = sd_bus_message_peek_type(m, &type, &contents); - if (r < 0) - return r; - - if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { - - /* The bloom filter includes simple strings of any kind */ - r = sd_bus_message_read_basic(m, type, &t); - if (r < 0) - return r; - - add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); - } - - if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { - - /* As well as array of simple strings of any kinds */ - r = sd_bus_message_enter_container(m, type, contents); - if (r < 0) - return r; - - while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) - add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); - if (r < 0) - return r; - - r = sd_bus_message_exit_container(m); - if (r < 0) - return r; - - } else - /* Stop adding to bloom filter as soon as we - * run into the first argument we cannot add - * to it. */ - break; - } - - return 0; -} - -static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { - struct bus_body_part *part; - struct kdbus_item *d; - const char *destination; - bool well_known = false; - uint64_t dst_id; - size_t sz, dl; - unsigned i; - int r; - - assert(b); - assert(m); - assert(m->sealed); - - /* We put this together only once, if this message is reused - * we reuse the earlier-built version */ - if (m->kdbus) - return 0; - - destination = m->destination ?: m->destination_ptr; - - if (destination) { - r = bus_kernel_parse_unique_name(destination, &dst_id); - if (r < 0) - return r; - if (r == 0) { - well_known = true; - - /* verify_destination_id will usually be 0, which makes the kernel - * driver only look at the provided well-known name. Otherwise, - * the kernel will make sure the provided destination id matches - * the owner of the provided well-known-name, and fail if they - * differ. Currently, this is only needed for bus-proxyd. */ - dst_id = m->verify_destination_id; - } - } else - dst_id = KDBUS_DST_ID_BROADCAST; - - sz = offsetof(struct kdbus_msg, items); - - /* Add in fixed header, fields header and payload */ - sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + - MAX(sizeof(struct kdbus_vec), - sizeof(struct kdbus_memfd))); - - /* Add space for bloom filter */ - sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + - offsetof(struct kdbus_bloom_filter, data) + - m->bus->bloom_size); - - /* Add in well-known destination header */ - if (well_known) { - dl = strlen(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; - memzero(m->kdbus, sz); - - m->kdbus->flags = - ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | - ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | - ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); - - m->kdbus->dst_id = dst_id; - m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; - m->kdbus->cookie = m->header->dbus2.cookie; - m->kdbus->priority = m->priority; - - if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) - m->kdbus->cookie_reply = m->reply_cookie; - else { - struct timespec now; - - assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); - m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + - m->timeout * NSEC_PER_USEC; - } - - d = m->kdbus->items; - - if (well_known) - append_destination(&d, 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 && 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->memfd_offset, 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->header->type == SD_BUS_MESSAGE_SIGNAL) { - struct kdbus_bloom_filter *bloom; - - bloom = append_bloom(&d, m->bus->bloom_size); - r = bus_message_setup_bloom(m, bloom); - 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; -} - -static void unset_memfds(struct sd_bus_message *m) { - struct bus_body_part *part; - unsigned i; - - assert(m); - - /* Make sure the memfds are not freed twice */ - MESSAGE_FOREACH_PART(part, i, m) - if (part->memfd >= 0) - part->memfd = -1; -} - -static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { - assert(bus); - assert(m); - - if (!ts) - return; - - if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) - return; - - m->realtime = ts->realtime_ns / NSEC_PER_USEC; - m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; - m->seqnum = ts->seqnum; -} - -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 *header = NULL; - void *footer = NULL; - size_t header_size = 0, footer_size = 0; - size_t n_bytes = 0, idx = 0; - const char *destination = NULL, *seclabel = NULL; - bool last_was_memfd = false; - 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 (!header) { - header = (struct bus_header*)((uint8_t*) k + d->vec.offset); - header_size = d->vec.size; - } - - footer = (uint8_t*) k + d->vec.offset; - footer_size = d->vec.size; - - n_bytes += d->vec.size; - last_was_memfd = false; - break; - - case KDBUS_ITEM_PAYLOAD_MEMFD: - if (!header) /* memfd cannot be first part */ - return -EBADMSG; - - n_bytes += d->memfd.size; - last_was_memfd = true; - 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 (last_was_memfd) /* memfd cannot be last part */ - return -EBADMSG; - - if (!header) - return -EBADMSG; - - if (header_size < sizeof(struct bus_header)) - return -EBADMSG; - - /* on kdbus we only speak native endian gvariant, never dbus1 - * marshalling or reverse endian */ - if (header->version != 2 || - header->endian != BUS_NATIVE_ENDIAN) - return -EPROTOTYPE; - - r = bus_message_from_header( - bus, - header, header_size, - footer, footer_size, - n_bytes, - fds, n_fds, - 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->memfd_offset = d->memfd.start; - part->size = d->memfd.size; - part->sealed = true; - - idx += d->memfd.size; - break; - } - - case KDBUS_ITEM_PIDS: - - /* The PID/TID might be missing, when the data - * is faked by a bus proxy and it lacks that - * information about the real client (since - * SO_PEERCRED is used for that). Also kernel - * namespacing might make some of this data - * unavailable when untranslatable. */ - - if (d->pids.pid > 0) { - m->creds.pid = (pid_t) d->pids.pid; - m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; - } - - if (d->pids.tid > 0) { - m->creds.tid = (pid_t) d->pids.tid; - m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; - } - - if (d->pids.ppid > 0) { - m->creds.ppid = (pid_t) d->pids.ppid; - m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; - } else if (d->pids.pid == 1) { - m->creds.ppid = 0; - m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; - } - - break; - - case KDBUS_ITEM_CREDS: - - /* EUID/SUID/FSUID/EGID/SGID/FSGID might be - * missing too (see above). */ - - if ((uid_t) d->creds.uid != UID_INVALID) { - m->creds.uid = (uid_t) d->creds.uid; - m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; - } - - if ((uid_t) d->creds.euid != UID_INVALID) { - m->creds.euid = (uid_t) d->creds.euid; - m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; - } - - if ((uid_t) d->creds.suid != UID_INVALID) { - m->creds.suid = (uid_t) d->creds.suid; - m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; - } - - if ((uid_t) d->creds.fsuid != UID_INVALID) { - m->creds.fsuid = (uid_t) d->creds.fsuid; - m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; - } - - if ((gid_t) d->creds.gid != GID_INVALID) { - m->creds.gid = (gid_t) d->creds.gid; - m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; - } - - if ((gid_t) d->creds.egid != GID_INVALID) { - m->creds.egid = (gid_t) d->creds.egid; - m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; - } - - if ((gid_t) d->creds.sgid != GID_INVALID) { - m->creds.sgid = (gid_t) d->creds.sgid; - m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; - } - - if ((gid_t) d->creds.fsgid != GID_INVALID) { - m->creds.fsgid = (gid_t) d->creds.fsgid; - m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; - } - - break; - - case KDBUS_ITEM_TIMESTAMP: - message_set_timestamp(bus, m, &d->timestamp); - 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; - - r = bus_get_root_path(bus); - 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.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; - - m->creds.audit_login_uid = (uid_t) d->audit.loginuid; - m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; - break; - - case KDBUS_ITEM_CAPS: - if (d->caps.last_cap != cap_last_cap() || - d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { - r = -EBADMSG; - goto fail; - } - - m->creds.capability = d->caps.caps; - 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)) { - r = -EBADMSG; - goto fail; - } - - destination = d->str; - break; - - case KDBUS_ITEM_OWNED_NAME: - if (!service_name_is_valid(d->name.name)) { - r = -EBADMSG; - goto fail; - } - - if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { - char **wkn; - size_t n; - - /* We just extend the array here, but - * do not allocate the strings inside - * of it, instead we just point to our - * buffer directly. */ - n = strv_length(m->creds.well_known_names); - wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); - if (!wkn) { - r = -ENOMEM; - goto fail; - } - - wkn[n] = d->name.name; - wkn[n+1] = NULL; - m->creds.well_known_names = wkn; - - m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; - } - break; - - case KDBUS_ITEM_CONN_DESCRIPTION: - m->creds.description = d->str; - m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; - break; - - case KDBUS_ITEM_AUXGROUPS: - - if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { - size_t i, n; - gid_t *g; - - n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); - g = new(gid_t, n); - if (!g) { - r = -ENOMEM; - goto fail; - } - - for (i = 0; i < n; i++) - g[i] = d->data64[i]; - - m->creds.supplementary_gids = g; - m->creds.n_supplementary_gids = n; - m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; - } - - break; - - case KDBUS_ITEM_FDS: - case KDBUS_ITEM_SECLABEL: - case KDBUS_ITEM_BLOOM_FILTER: - break; - - default: - log_debug("Got unknown field from kernel %llu", d->type); - } - } - - /* If we requested the list of well-known names to be appended - * and the sender had none no item for it will be - * attached. However, this does *not* mean that the kernel - * didn't want to provide this information to us. Hence, let's - * explicitly mark this information as available if it was - * requested. */ - m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; - - r = bus_message_parse_fields(m); - if (r < 0) - goto fail; - - /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ - if ((uint64_t) m->header->dbus2.cookie != k->cookie) { - r = -EBADMSG; - goto fail; - } - - /* Refuse messages where the reply flag doesn't match up */ - if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { - r = -EBADMSG; - goto fail; - } - - /* Refuse reply messages where the reply cookie doesn't match up */ - if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { - r = -EBADMSG; - goto fail; - } - - /* Refuse messages where the autostart flag doesn't match up */ - if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { - r = -EBADMSG; - goto fail; - } - - /* Override information from the user header with data from the kernel */ - if (k->src_id == KDBUS_SRC_ID_KERNEL) - bus_message_set_sender_driver(bus, m); - else { - xsprintf(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 { - xsprintf(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: - unset_memfds(m); - sd_bus_message_unref(m); - - return r; -} - -int bus_kernel_take_fd(sd_bus *b) { - struct kdbus_bloom_parameter *bloom = NULL; - struct kdbus_item *items, *item; - struct kdbus_cmd_hello *hello; - _cleanup_free_ char *g = NULL; - const char *name; - size_t l = 0, m = 0, sz; - int r; - - assert(b); - - if (b->is_server) - return -EINVAL; - - b->use_memfd = 1; - - if (b->description) { - g = bus_label_escape(b->description); - if (!g) - return -ENOMEM; - - name = g; - } else { - char pr[17] = {}; - - /* If no name is explicitly set, we'll include a hint - * indicating the library implementation, a hint which - * kind of bus this is and the thread name */ - - assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); - - if (isempty(pr)) { - name = b->is_system ? "sd-system" : - b->is_user ? "sd-user" : "sd"; - } else { - _cleanup_free_ char *e = NULL; - - e = bus_label_escape(pr); - if (!e) - return -ENOMEM; - - g = strappend(b->is_system ? "sd-system-" : - b->is_user ? "sd-user-" : "sd-", - e); - if (!g) - return -ENOMEM; - - name = g; - } - - b->description = bus_label_unescape(name); - if (!b->description) - return -ENOMEM; - } - - m = strlen(name); - - sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + - ALIGN8(offsetof(struct kdbus_item, str) + m + 1); - - if (b->fake_creds_valid) - sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); - - if (b->fake_pids_valid) - sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); - - if (b->fake_label) { - l = strlen(b->fake_label); - sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); - } - - hello = alloca0_align(sz, 8); - hello->size = sz; - hello->flags = b->hello_flags; - hello->attach_flags_send = _KDBUS_ATTACH_ANY; - hello->attach_flags_recv = b->attach_flags; - hello->pool_size = KDBUS_POOL_SIZE; - - item = hello->items; - - item->size = offsetof(struct kdbus_item, str) + m + 1; - item->type = KDBUS_ITEM_CONN_DESCRIPTION; - memcpy(item->str, name, m + 1); - item = KDBUS_ITEM_NEXT(item); - - 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_pids_valid) { - item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); - item->type = KDBUS_ITEM_PIDS; - item->pids = b->fake_pids; - - item = KDBUS_ITEM_NEXT(item); - } - - if (b->fake_label) { - item->size = offsetof(struct kdbus_item, str) + l + 1; - item->type = KDBUS_ITEM_SECLABEL; - memcpy(item->str, b->fake_label, l+1); - } - - r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); - if (r < 0) { - if (errno == ENOTTY) - /* If the ioctl is not supported we assume that the - * API version changed in a major incompatible way, - * let's indicate an API incompatibility in this - * case. */ - return -ESOCKTNOSUPPORT; - - 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; - r = -errno; - goto fail; - } - } - - /* The higher 32bit of the bus_flags fields are considered - * 'incompatible flags'. Refuse them all for now. */ - if (hello->bus_flags > 0xFFFFFFFFULL) { - r = -ESOCKTNOSUPPORT; - goto fail; - } - - /* extract bloom parameters from items */ - items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); - KDBUS_FOREACH(item, items, hello->items_size) { - switch (item->type) { - case KDBUS_ITEM_BLOOM_PARAMETER: - bloom = &item->bloom_parameter; - break; - } - } - - if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { - r = -EOPNOTSUPP; - goto fail; - } - - b->bloom_size = (size_t) bloom->size; - b->bloom_n_hash = (unsigned) bloom->n_hash; - - if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { - r = -ENOMEM; - goto fail; - } - - b->unique_id = hello->id; - - b->is_kernel = true; - b->bus_client = true; - b->can_fds = !!(hello->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)); - - /* free returned items */ - (void) bus_kernel_cmd_free(b, hello->offset); - return bus_start_running(b); - -fail: - (void) bus_kernel_cmd_free(b, hello->offset); - return r; -} - -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_cmd_free(sd_bus *bus, uint64_t offset) { - struct kdbus_cmd_free cmd = { - .size = sizeof(cmd), - .offset = offset, - }; - int r; - - assert(bus); - assert(bus->is_kernel); - - r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); - if (r < 0) - return -errno; - - return 0; -} - -static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { - struct kdbus_item *d; - - assert(bus); - assert(k); - - 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) - safe_close(d->memfd.fd); - } - - bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); -} - -int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { - struct kdbus_cmd_send cmd = { }; - 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; - - cmd.size = sizeof(cmd); - cmd.msg_address = (uintptr_t)m->kdbus; - - /* If this is a synchronous method call, then let's tell the - * kernel, so that it can pass CPU time/scheduling to the - * destination for the time, if it wants to. If we - * synchronously wait for the result anyway, we won't need CPU - * anyway. */ - if (hint_sync_call) { - m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; - cmd.flags |= KDBUS_SEND_SYNC_REPLY; - } - - r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); - if (r < 0) { - _cleanup_(sd_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; - - } else if (hint_sync_call) { - struct kdbus_msg *k; - - k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); - assert(k); - - if (k->payload_type == KDBUS_PAYLOAD_DBUS) { - - r = bus_kernel_make_message(bus, k); - if (r < 0) { - close_kdbus_msg(bus, k); - - /* Anybody can send us invalid messages, let's just drop them. */ - if (r == -EBADMSG || r == -EPROTOTYPE) - log_debug_errno(r, "Ignoring invalid synchronous reply: %m"); - else - return r; - } - } else { - log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); - close_kdbus_msg(bus, k); - } - } - - return 1; -} - -static int push_name_owner_changed( - sd_bus *bus, - const char *name, - const char *old_owner, - const char *new_owner, - const struct kdbus_timestamp *ts) { - - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; - int r; - - assert(bus); - - r = sd_bus_message_new_signal( - bus, - &m, - "/org/freedesktop/DBus", - "org.freedesktop.DBus", - "NameOwnerChanged"); - if (r < 0) - return r; - - r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); - if (r < 0) - return r; - - bus_message_set_sender_driver(bus, m); - message_set_timestamp(bus, m, ts); - - 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, - const struct kdbus_msg *k, - const struct kdbus_item *d, - const struct kdbus_timestamp *ts) { - - 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_id.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.id); - - if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.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.id); - - return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); -} - -static int translate_id_change( - sd_bus *bus, - const struct kdbus_msg *k, - const struct kdbus_item *d, - const struct kdbus_timestamp *ts) { - - 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, - ts); -} - -static int translate_reply( - sd_bus *bus, - const struct kdbus_msg *k, - const struct kdbus_item *d, - const struct kdbus_timestamp *ts) { - - _cleanup_(sd_bus_message_unrefp) 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; - - message_set_timestamp(bus, m, ts); - - 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) { - static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { - [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, - }; - - struct kdbus_item *d, *found = NULL; - struct kdbus_timestamp *ts = NULL; - - assert(bus); - assert(k); - assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); - - KDBUS_ITEM_FOREACH(d, k, items) { - if (d->type == KDBUS_ITEM_TIMESTAMP) - ts = &d->timestamp; - else 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, ts); -} - -int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { - struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; - struct kdbus_msg *k; - int r; - - assert(bus); - - r = bus_rqueue_make_room(bus); - if (r < 0) - return r; - - if (hint_priority) { - recv.flags |= KDBUS_RECV_USE_PRIORITY; - recv.priority = priority; - } - - r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); - if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS) - log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); - if (r < 0) { - if (errno == EAGAIN) - return 0; - - return -errno; - } - - k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); - 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_errno(r, "Ignoring invalid message: %m"); - r = 0; - } - - if (r <= 0) - close_kdbus_msg(bus, k); - } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) { - r = bus_kernel_translate_message(bus, k); - close_kdbus_msg(bus, k); - } else { - log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); - 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 -EOPNOTSUPP; - - 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 = memfd_new(bus->description); - if (r < 0) - return r; - - *address = NULL; - *mapped = 0; - *allocated = 0; - return r; - } - - 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); - - safe_close(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(memfd_set_size(fd, 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); -} - -uint64_t request_name_flags_to_kdbus(uint64_t flags) { - uint64_t f = 0; - - 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; - - return f; -} - -uint64_t attach_flags_to_kdbus(uint64_t mask) { - uint64_t m = 0; - - if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| - SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) - m |= KDBUS_ATTACH_CREDS; - - if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID)) - m |= KDBUS_ATTACH_PIDS; - - if (mask & SD_BUS_CREDS_COMM) - m |= KDBUS_ATTACH_PID_COMM; - - if (mask & SD_BUS_CREDS_TID_COMM) - m |= KDBUS_ATTACH_TID_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; - - if (mask & SD_BUS_CREDS_DESCRIPTION) - m |= KDBUS_ATTACH_CONN_DESCRIPTION; - - if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) - m |= KDBUS_ATTACH_AUXGROUPS; - - return m; -} - -int bus_kernel_create_bus(const char *name, bool world, char **s) { - struct kdbus_cmd *make; - struct kdbus_item *n; - size_t l; - int fd; - - assert(name); - assert(s); - - fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - l = strlen(name); - make = alloca0_align(offsetof(struct kdbus_cmd, items) + - ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + - ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + - ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), - 8); - - make->size = offsetof(struct kdbus_cmd, items); - - /* Set the bloom parameters */ - n = make->items; - n->size = offsetof(struct kdbus_item, bloom_parameter) + - sizeof(struct kdbus_bloom_parameter); - n->type = KDBUS_ITEM_BLOOM_PARAMETER; - n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; - n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; - - assert_cc(DEFAULT_BLOOM_SIZE > 0); - assert_cc(DEFAULT_BLOOM_N_HASH > 0); - - make->size += ALIGN8(n->size); - - /* Provide all metadata via bus-owner queries */ - n = KDBUS_ITEM_NEXT(n); - n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; - n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); - n->data64[0] = _KDBUS_ATTACH_ANY; - make->size += ALIGN8(n->size); - - /* Set the a good name */ - n = KDBUS_ITEM_NEXT(n); - sprintf(n->str, UID_FMT "-%s", 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 = world ? KDBUS_MAKE_ACCESS_WORLD : 0; - - if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { - safe_close(fd); - - /* Major API change? then the ioctls got shuffled around. */ - if (errno == ENOTTY) - return -ESOCKTNOSUPPORT; - - return -errno; - } - - if (s) { - char *p; - - p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); - if (!p) { - safe_close(fd); - return -ENOMEM; - } - - *s = p; - } - - return fd; -} - -int bus_kernel_open_bus_fd(const char *bus, char **path) { - char *p; - int fd; - size_t len; - - assert(bus); - - len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; - - if (path) { - p = new(char, len); - if (!p) - return -ENOMEM; - } else - p = newa(char, len); - - sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); - - fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) { - if (path) - free(p); - - return -errno; - } - - if (path) - *path = p; - - return fd; -} - -int bus_kernel_try_close(sd_bus *bus) { - struct kdbus_cmd byebye = { .size = sizeof(byebye) }; - - assert(bus); - assert(bus->is_kernel); - - if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) - return -errno; - - return 0; -} - -int bus_kernel_drop_one(int fd) { - struct kdbus_cmd_recv recv = { - .size = sizeof(recv), - .flags = KDBUS_RECV_DROP, - }; - - assert(fd >= 0); - - if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) - return -errno; - - return 0; -} - -int bus_kernel_realize_attach_flags(sd_bus *bus) { - struct kdbus_cmd *update; - struct kdbus_item *n; - - assert(bus); - assert(bus->is_kernel); - - update = alloca0_align(offsetof(struct kdbus_cmd, items) + - ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), - 8); - - n = update->items; - n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; - n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); - n->data64[0] = bus->attach_flags; - - update->size = - offsetof(struct kdbus_cmd, items) + - ALIGN8(n->size); - - if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) - return -errno; - - return 0; -} - -int bus_kernel_get_bus_name(sd_bus *bus, char **name) { - struct kdbus_cmd_info cmd = { - .size = sizeof(struct kdbus_cmd_info), - }; - struct kdbus_info *info; - struct kdbus_item *item; - char *n = NULL; - int r; - - assert(bus); - assert(name); - assert(bus->is_kernel); - - r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); - if (r < 0) - return -errno; - - info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); - - KDBUS_ITEM_FOREACH(item, info, items) - if (item->type == KDBUS_ITEM_MAKE_NAME) { - r = free_and_strdup(&n, item->str); - break; - } - - bus_kernel_cmd_free(bus, cmd.offset); - - if (r < 0) - return r; - if (!n) - return -EIO; - - *name = n; - return 0; -} |