bus-message.c revision 9bcbce4201afada1c0ad8ada0cbfbbf58a52a6a7
/*-*- 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/>.
***/
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "util.h"
#include "utf8.h"
#include "strv.h"
#include "time-util.h"
#include "cgroup-util.h"
#include "sd-bus.h"
#include "bus-message.h"
#include "bus-internal.h"
#include "bus-type.h"
#include "bus-signature.h"
static int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored);
static void *adjust_pointer(const void *p, void *old_base, size_t sz, void *new_base) {
if (p == NULL)
return NULL;
if (old_base == new_base)
return (void*) p;
if ((uint8_t*) p < (uint8_t*) old_base)
return (void*) p;
if ((uint8_t*) p >= (uint8_t*) old_base + sz)
return (void*) p;
return (uint8_t*) new_base + ((uint8_t*) p - (uint8_t*) old_base);
}
static void message_free_part(sd_bus_message *m, struct bus_body_part *part) {
assert(m);
assert(part);
if (part->memfd >= 0) {
/* If we can reuse the memfd, try that. For that it
* can't be sealed yet. */
if (!part->sealed)
bus_kernel_push_memfd(m->bus, part->memfd, part->data, part->mapped);
else {
if (part->mapped > 0)
assert_se(munmap(part->data, part->mapped) == 0);
close_nointr_nofail(part->memfd);
}
} else if (part->munmap_this)
munmap(part->data, part->mapped);
else if (part->free_this)
free(part->data);
if (part != &m->body)
free(part);
}
static void message_reset_parts(sd_bus_message *m) {
struct bus_body_part *part;
assert(m);
part = &m->body;
while (m->n_body_parts > 0) {
struct bus_body_part *next = part->next;
message_free_part(m, part);
part = next;
m->n_body_parts--;
}
m->body_end = NULL;
m->cached_rindex_part = NULL;
m->cached_rindex_part_begin = 0;
}
static void message_reset_containers(sd_bus_message *m) {
unsigned i;
assert(m);
for (i = 0; i < m->n_containers; i++)
free(m->containers[i].signature);
free(m->containers);
m->containers = NULL;
m->n_containers = 0;
m->root_container.index = 0;
}
static void message_free(sd_bus_message *m) {
assert(m);
if (m->free_header)
free(m->header);
message_reset_parts(m);
if (m->free_kdbus)
free(m->kdbus);
if (m->release_kdbus) {
uint64_t off;
off = (uint8_t *)m->kdbus - (uint8_t *)m->bus->kdbus_buffer;
ioctl(m->bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off);
}
if (m->bus)
sd_bus_unref(m->bus);
if (m->free_fds) {
close_many(m->fds, m->n_fds);
free(m->fds);
}
if (m->iovec != m->iovec_fixed)
free(m->iovec);
free(m->cmdline_array);
message_reset_containers(m);
free(m->root_container.signature);
free(m->peeked_signature);
free(m->unit);
free(m->user_unit);
free(m->session);
free(m);
}
static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz) {
void *op, *np;
size_t old_size, new_size, start;
assert(m);
if (m->poisoned)
return NULL;
old_size = sizeof(struct bus_header) + m->header->fields_size;
start = ALIGN_TO(old_size, align);
new_size = start + sz;
if (old_size == new_size)
return (uint8_t*) m->header + old_size;
if (new_size > (size_t) ((uint32_t) -1))
goto poison;
if (m->free_header) {
np = realloc(m->header, ALIGN8(new_size));
if (!np)
goto poison;
} else {
/* Initially, the header is allocated as part of of
* the sd_bus_message itself, let's replace it by
* dynamic data */
np = malloc(ALIGN8(new_size));
if (!np)
goto poison;
memcpy(np, m->header, sizeof(struct bus_header));
}
/* Zero out padding */
if (start > old_size)
memset((uint8_t*) np + old_size, 0, start - old_size);
op = m->header;
m->header = np;
m->header->fields_size = new_size - sizeof(struct bus_header);
/* Adjust quick access pointers */
m->path = adjust_pointer(m->path, op, old_size, m->header);
m->interface = adjust_pointer(m->interface, op, old_size, m->header);
m->member = adjust_pointer(m->member, op, old_size, m->header);
m->destination = adjust_pointer(m->destination, op, old_size, m->header);
m->sender = adjust_pointer(m->sender, op, old_size, m->header);
m->error.name = adjust_pointer(m->error.name, op, old_size, m->header);
m->free_header = true;
return (uint8_t*) np + start;
poison:
m->poisoned = true;
return NULL;
}
static int message_append_field_string(
sd_bus_message *m,
uint8_t h,
char type,
const char *s,
const char **ret) {
size_t l;
uint8_t *p;
assert(m);
l = strlen(s);
if (l > (size_t) (uint32_t) -1)
return -EINVAL;
/* field id byte + signature length + signature 's' + NUL + string length + string + NUL */
p = message_extend_fields(m, 8, 4 + 4 + l + 1);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = type;
p[3] = 0;
((uint32_t*) p)[1] = l;
memcpy(p + 8, s, l + 1);
if (ret)
*ret = (char*) p + 8;
return 0;
}
static int message_append_field_signature(
sd_bus_message *m,
uint8_t h,
const char *s,
const char **ret) {
size_t l;
uint8_t *p;
assert(m);
l = strlen(s);
if (l > 255)
return -EINVAL;
/* field id byte + signature length + signature 'g' + NUL + string length + string + NUL */
p = message_extend_fields(m, 8, 4 + 1 + l + 1);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = SD_BUS_TYPE_SIGNATURE;
p[3] = 0;
p[4] = l;
memcpy(p + 5, s, l + 1);
if (ret)
*ret = (const char*) p + 5;
return 0;
}
static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x) {
uint8_t *p;
assert(m);
/* field id byte + signature length + signature 'u' + NUL + value */
p = message_extend_fields(m, 8, 4 + 4);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = SD_BUS_TYPE_UINT32;
p[3] = 0;
((uint32_t*) p)[1] = x;
return 0;
}
int bus_message_from_header(
void *buffer,
size_t length,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
const char *label,
size_t extra,
sd_bus_message **ret) {
sd_bus_message *m;
struct bus_header *h;
size_t a, label_sz;
assert(buffer || length <= 0);
assert(fds || n_fds <= 0);
assert(ret);
if (length < sizeof(struct bus_header))
return -EBADMSG;
h = buffer;
if (h->version != 1)
return -EBADMSG;
if (h->serial == 0)
return -EBADMSG;
if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
return -EBADMSG;
if (h->endian != SD_BUS_LITTLE_ENDIAN &&
h->endian != SD_BUS_BIG_ENDIAN)
return -EBADMSG;
a = ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
if (label) {
label_sz = strlen(label);
a += label_sz + 1;
}
m = malloc0(a);
if (!m)
return -ENOMEM;
m->n_ref = 1;
m->sealed = true;
m->header = h;
m->fds = fds;
m->n_fds = n_fds;
if (ucred) {
m->uid = ucred->uid;
m->pid = ucred->pid;
m->gid = ucred->gid;
m->uid_valid = m->gid_valid = true;
}
if (label) {
m->label = (char*) m + ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
memcpy(m->label, label, label_sz + 1);
}
*ret = m;
return 0;
}
int bus_message_from_malloc(
void *buffer,
size_t length,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
const char *label,
sd_bus_message **ret) {
sd_bus_message *m;
int r;
r = bus_message_from_header(buffer, length, fds, n_fds, ucred, label, 0, &m);
if (r < 0)
return r;
if (length != BUS_MESSAGE_SIZE(m)) {
r = -EBADMSG;
goto fail;
}
m->n_body_parts = 1;
m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
m->body.size = length - sizeof(struct bus_header) - ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
m->body.sealed = true;
m->body.memfd = -1;
m->n_iovec = 1;
m->iovec = m->iovec_fixed;
m->iovec[0].iov_base = buffer;
m->iovec[0].iov_len = length;
r = bus_message_parse_fields(m);
if (r < 0)
goto fail;
/* We take possession of the memory and fds now */
m->free_header = true;
m->free_fds = true;
*ret = m;
return 0;
fail:
message_free(m);
return r;
}
static sd_bus_message *message_new(sd_bus *bus, uint8_t type) {
sd_bus_message *m;
m = malloc0(ALIGN(sizeof(sd_bus_message)) + sizeof(struct bus_header));
if (!m)
return NULL;
m->n_ref = 1;
m->header = (struct bus_header*) ((uint8_t*) m + ALIGN(sizeof(struct sd_bus_message)));
m->header->endian = SD_BUS_NATIVE_ENDIAN;
m->header->type = type;
m->header->version = bus ? bus->message_version : 1;
m->allow_fds = !bus || bus->can_fds || (bus->state != BUS_HELLO && bus->state != BUS_RUNNING);
if (bus)
m->bus = sd_bus_ref(bus);
return m;
}
int sd_bus_message_new_signal(
sd_bus *bus,
const char *path,
const char *interface,
const char *member,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!path)
return -EINVAL;
if (!interface)
return -EINVAL;
if (!member)
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_SIGNAL);
if (!t)
return -ENOMEM;
t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
if (r < 0)
goto fail;
*m = t;
return 0;
fail:
sd_bus_message_unref(t);
return r;
}
int sd_bus_message_new_method_call(
sd_bus *bus,
const char *destination,
const char *path,
const char *interface,
const char *member,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (destination && !service_name_is_valid(destination))
return -EINVAL;
if (!object_path_is_valid(path))
return -EINVAL;
if (interface && !interface_name_is_valid(interface))
return -EINVAL;
if (!member_name_is_valid(member))
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_METHOD_CALL);
if (!t)
return -ENOMEM;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
if (r < 0)
goto fail;
if (interface) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
}
if (destination) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &t->destination);
if (r < 0)
goto fail;
}
*m = t;
return 0;
fail:
message_free(t);
return r;
}
static int message_new_reply(
sd_bus *bus,
sd_bus_message *call,
uint8_t type,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!call)
return -EINVAL;
if (!call->sealed)
return -EPERM;
if (call->header->type != SD_BUS_MESSAGE_METHOD_CALL)
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, type);
if (!t)
return -ENOMEM;
t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_serial = BUS_MESSAGE_SERIAL(call);
r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
if (r < 0)
goto fail;
if (call->sender) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->destination);
if (r < 0)
goto fail;
}
t->dont_send = !!(call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED);
*m = t;
return 0;
fail:
message_free(t);
return r;
}
int sd_bus_message_new_method_return(
sd_bus *bus,
sd_bus_message *call,
sd_bus_message **m) {
return message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_RETURN, m);
}
int sd_bus_message_new_method_error(
sd_bus *bus,
sd_bus_message *call,
const sd_bus_error *e,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!sd_bus_error_is_set(e))
return -EINVAL;
if (!m)
return -EINVAL;
r = message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_ERROR, &t);
if (r < 0)
return r;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
if (r < 0)
goto fail;
if (e->message) {
r = message_append_basic(t, SD_BUS_TYPE_STRING, e->message, (const void**) &t->error.message);
if (r < 0)
goto fail;
}
*m = t;
return 0;
fail:
message_free(t);
return r;
}
int sd_bus_message_new_method_errorf(
sd_bus *bus,
sd_bus_message *call,
sd_bus_message **m,
const char *name,
const char *format,
...) {
_cleanup_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
va_list ap;
int r;
assert_return(name, -EINVAL);
assert_return(m, -EINVAL);
va_start(ap, format);
r = bus_error_setfv(&error, name, format, ap);
va_end(ap);
if (r < 0)
return r;
return sd_bus_message_new_method_error(bus, call, &error, m);
}
int sd_bus_message_new_method_errno(
sd_bus *bus,
sd_bus_message *call,
int error,
const sd_bus_error *p,
sd_bus_message **m) {
_cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
if (sd_bus_error_is_set(p))
return sd_bus_message_new_method_error(bus, call, p, m);
sd_bus_error_set_errno(&berror, error);
return sd_bus_message_new_method_error(bus, call, &berror, m);
}
int sd_bus_message_new_method_errnof(
sd_bus *bus,
sd_bus_message *call,
sd_bus_message **m,
int error,
const char *format,
...) {
_cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
va_list ap;
int r;
va_start(ap, format);
r = bus_error_set_errnofv(&berror, error, format, ap);
va_end(ap);
if (r < 0)
return r;
return sd_bus_message_new_method_error(bus, call, &berror, m);
}
int bus_message_new_synthetic_error(
sd_bus *bus,
uint64_t serial,
const sd_bus_error *e,
sd_bus_message **m) {
sd_bus_message *t;
int r;
assert(sd_bus_error_is_set(e));
assert(m);
t = message_new(bus, SD_BUS_MESSAGE_METHOD_ERROR);
if (!t)
return -ENOMEM;
t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_serial = serial;
r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
if (r < 0)
goto fail;
if (bus && bus->unique_name) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, bus->unique_name, &t->destination);
if (r < 0)
goto fail;
}
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
if (r < 0)
goto fail;
if (e->message) {
r = message_append_basic(t, SD_BUS_TYPE_STRING, e->message, (const void**) &t->error.message);
if (r < 0)
goto fail;
}
*m = t;
return 0;
fail:
message_free(t);
return r;
}
sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
if (!m)
return NULL;
assert(m->n_ref > 0);
m->n_ref++;
return m;
}
sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
if (!m)
return NULL;
assert(m->n_ref > 0);
m->n_ref--;
if (m->n_ref <= 0)
message_free(m);
return NULL;
}
int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
if (!m)
return -EINVAL;
if (!type)
return -EINVAL;
*type = m->header->type;
return 0;
}
int sd_bus_message_get_serial(sd_bus_message *m, uint64_t *serial) {
if (!m)
return -EINVAL;
if (!serial)
return -EINVAL;
if (m->header->serial == 0)
return -ENOENT;
*serial = BUS_MESSAGE_SERIAL(m);
return 0;
}
int sd_bus_message_get_reply_serial(sd_bus_message *m, uint64_t *serial) {
if (!m)
return -EINVAL;
if (!serial)
return -EINVAL;
if (m->reply_serial == 0)
return -ENOENT;
*serial = m->reply_serial;
return 0;
}
int sd_bus_message_get_no_reply(sd_bus_message *m) {
if (!m)
return -EINVAL;
return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
}
const char *sd_bus_message_get_path(sd_bus_message *m) {
if (!m)
return NULL;
return m->path;
}
const char *sd_bus_message_get_interface(sd_bus_message *m) {
if (!m)
return NULL;
return m->interface;
}
const char *sd_bus_message_get_member(sd_bus_message *m) {
if (!m)
return NULL;
return m->member;
}
const char *sd_bus_message_get_destination(sd_bus_message *m) {
if (!m)
return NULL;
return m->destination;
}
const char *sd_bus_message_get_sender(sd_bus_message *m) {
if (!m)
return NULL;
return m->sender;
}
const sd_bus_error *sd_bus_message_get_error(sd_bus_message *m) {
if (!m)
return NULL;
if (!sd_bus_error_is_set(&m->error))
return NULL;
return &m->error;
}
int sd_bus_message_get_uid(sd_bus_message *m, uid_t *uid) {
if (!m)
return -EINVAL;
if (!uid)
return -EINVAL;
if (!m->uid_valid)
return -ESRCH;
*uid = m->uid;
return 0;
}
int sd_bus_message_get_gid(sd_bus_message *m, gid_t *gid) {
if (!m)
return -EINVAL;
if (!gid)
return -EINVAL;
if (!m->gid_valid)
return -ESRCH;
*gid = m->gid;
return 0;
}
int sd_bus_message_get_pid(sd_bus_message *m, pid_t *pid) {
if (!m)
return -EINVAL;
if (!pid)
return -EINVAL;
if (m->pid <= 0)
return -ESRCH;
*pid = m->pid;
return 0;
}
int sd_bus_message_get_tid(sd_bus_message *m, pid_t *tid) {
if (!m)
return -EINVAL;
if (!tid)
return -EINVAL;
if (m->tid <= 0)
return -ESRCH;
*tid = m->tid;
return 0;
}
int sd_bus_message_get_pid_starttime(sd_bus_message *m, uint64_t *usec) {
if (!m)
return -EINVAL;
if (!usec)
return -EINVAL;
if (m->pid_starttime <= 0)
return -ESRCH;
*usec = m->pid_starttime;
return 0;
}
int sd_bus_message_get_selinux_context(sd_bus_message *m, const char **ret) {
if (!m)
return -EINVAL;
if (!m->label)
return -ESRCH;
*ret = m->label;
return 0;
}
int sd_bus_message_get_monotonic_timestamp(sd_bus_message *m, uint64_t *usec) {
if (!m)
return -EINVAL;
if (!usec)
return -EINVAL;
if (m->monotonic <= 0)
return -ESRCH;
*usec = m->monotonic;
return 0;
}
int sd_bus_message_get_realtime_timestamp(sd_bus_message *m, uint64_t *usec) {
if (!m)
return -EINVAL;
if (!usec)
return -EINVAL;
if (m->realtime <= 0)
return -ESRCH;
*usec = m->realtime;
return 0;
}
int sd_bus_message_get_comm(sd_bus_message *m, const char **ret) {
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->comm)
return -ESRCH;
*ret = m->comm;
return 0;
}
int sd_bus_message_get_tid_comm(sd_bus_message *m, const char **ret) {
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->tid_comm)
return -ESRCH;
*ret = m->tid_comm;
return 0;
}
int sd_bus_message_get_exe(sd_bus_message *m, const char **ret) {
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->exe)
return -ESRCH;
*ret = m->exe;
return 0;
}
int sd_bus_message_get_cgroup(sd_bus_message *m, const char **ret) {
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->cgroup)
return -ESRCH;
*ret = m->cgroup;
return 0;
}
int sd_bus_message_get_unit(sd_bus_message *m, const char **ret) {
int r;
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->cgroup)
return -ESRCH;
if (!m->unit) {
r = cg_path_get_unit(m->cgroup, &m->unit);
if (r < 0)
return r;
}
*ret = m->unit;
return 0;
}
int sd_bus_message_get_user_unit(sd_bus_message *m, const char **ret) {
int r;
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->cgroup)
return -ESRCH;
if (!m->user_unit) {
r = cg_path_get_user_unit(m->cgroup, &m->user_unit);
if (r < 0)
return r;
}
*ret = m->user_unit;
return 0;
}
int sd_bus_message_get_session(sd_bus_message *m, const char **ret) {
int r;
if (!m)
return -EINVAL;
if (!ret)
return -EINVAL;
if (!m->cgroup)
return -ESRCH;
if (!m->session) {
r = cg_path_get_session(m->cgroup, &m->session);
if (r < 0)
return r;
}
*ret = m->session;
return 0;
}
int sd_bus_message_get_owner_uid(sd_bus_message *m, uid_t *uid) {
if (!m)
return -EINVAL;
if (!uid)
return -EINVAL;
if (!m->cgroup)
return -ESRCH;
return cg_path_get_owner_uid(m->cgroup, uid);
}
int sd_bus_message_get_cmdline(sd_bus_message *m, char ***cmdline) {
size_t n, i;
const char *p;
bool first;
if (!m)
return -EINVAL;
if (!m->cmdline)
return -ENOENT;
for (p = m->cmdline, n = 0; p < m->cmdline + m->cmdline_length; p++)
if (*p == 0)
n++;
m->cmdline_array = new(char*, n + 1);
if (!m->cmdline_array)
return -ENOMEM;
for (p = m->cmdline, i = 0, first = true; p < m->cmdline + m->cmdline_length; p++) {
if (first)
m->cmdline_array[i++] = (char*) p;
first = *p == 0;
}
m->cmdline_array[i] = NULL;
*cmdline = m->cmdline_array;
return 0;
}
int sd_bus_message_get_audit_sessionid(sd_bus_message *m, uint32_t *sessionid) {
if (!m)
return -EINVAL;
if (!sessionid)
return -EINVAL;
if (!m->audit)
return -ESRCH;
*sessionid = m->audit->sessionid;
return 0;
}
int sd_bus_message_get_audit_loginuid(sd_bus_message *m, uid_t *uid) {
if (!m)
return -EINVAL;
if (!uid)
return -EINVAL;
if (!m->audit)
return -ESRCH;
*uid = m->audit->loginuid;
return 0;
}
int sd_bus_message_has_effective_cap(sd_bus_message *m, int capability) {
unsigned sz;
if (!m)
return -EINVAL;
if (capability < 0)
return -EINVAL;
if (!m->capability)
return -ESRCH;
sz = m->capability_size / 4;
if ((unsigned) capability >= sz*8)
return 0;
return !!(m->capability[2 * sz + (capability / 8)] & (1 << (capability % 8)));
}
int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_SIGNAL)
return 0;
if (interface && (!m->interface || !streq(m->interface, interface)))
return 0;
if (member && (!m->member || !streq(m->member, member)))
return 0;
return 1;
}
int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
return 0;
if (interface && (!m->interface || !streq(m->interface, interface)))
return 0;
if (member && (!m->member || !streq(m->member, member)))
return 0;
return 1;
}
int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
return 0;
if (name && (!m->error.name || !streq(m->error.name, name)))
return 0;
return 1;
}
int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
return -EPERM;
if (b)
m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
else
m->header->flags &= ~SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
return 0;
}
static struct bus_container *message_get_container(sd_bus_message *m) {
assert(m);
if (m->n_containers == 0)
return &m->root_container;
assert(m->containers);
return m->containers + m->n_containers - 1;
}
struct bus_body_part *message_append_part(sd_bus_message *m) {
struct bus_body_part *part;
assert(m);
if (m->poisoned)
return NULL;
if (m->n_body_parts <= 0) {
part = &m->body;
zero(*part);
} else {
assert(m->body_end);
part = new0(struct bus_body_part, 1);
if (!part) {
m->poisoned = true;
return NULL;
}
m->body_end->next = part;
}
part->memfd = -1;
m->body_end = part;
m->n_body_parts ++;
return part;
}
static void part_zero(struct bus_body_part *part, size_t sz) {
assert(part);
assert(sz > 0);
assert(sz < 8);
/* All other fields can be left in their defaults */
assert(!part->data);
assert(part->memfd < 0);
part->size = sz;
part->is_zero = true;
part->sealed = true;
}
static int part_make_space(
struct sd_bus_message *m,
struct bus_body_part *part,
size_t sz,
void **q) {
void *n;
int r;
assert(m);
assert(part);
assert(!part->sealed);
if (m->poisoned)
return -ENOMEM;
if (!part->data && part->memfd < 0)
part->memfd = bus_kernel_pop_memfd(m->bus, &part->data, &part->mapped);
if (part->memfd >= 0) {
uint64_t u = sz;
r = ioctl(part->memfd, KDBUS_CMD_MEMFD_SIZE_SET, &u);
if (r < 0) {
m->poisoned = true;
return -errno;
}
if (!part->data || sz > part->mapped) {
size_t psz = PAGE_ALIGN(sz > 0 ? sz : 1);
if (part->mapped <= 0)
n = mmap(NULL, psz, PROT_READ|PROT_WRITE, MAP_SHARED, part->memfd, 0);
else
n = mremap(part->data, part->mapped, psz, MREMAP_MAYMOVE);
if (n == MAP_FAILED) {
m->poisoned = true;
return -errno;
}
part->mapped = psz;
part->data = n;
}
part->munmap_this = true;
} else {
n = realloc(part->data, MAX(sz, 1u));
if (!n) {
m->poisoned = true;
return -ENOMEM;
}
part->data = n;
part->free_this = true;
}
if (q)
*q = part->data ? (uint8_t*) part->data + part->size : NULL;
part->size = sz;
return 0;
}
static void message_extend_containers(sd_bus_message *m, size_t expand) {
struct bus_container *c;
assert(m);
if (expand <= 0)
return;
/* Update counters */
for (c = m->containers; c < m->containers + m->n_containers; c++)
if (c->array_size)
*c->array_size += expand;
}
static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz) {
struct bus_body_part *part = NULL;
size_t start_body, end_body, padding, start_part, end_part, added;
bool add_new_part;
void *p;
int r;
assert(m);
assert(align > 0);
assert(!m->sealed);
if (m->poisoned)
return NULL;
start_body = ALIGN_TO((size_t) m->header->body_size, align);
end_body = start_body + sz;
padding = start_body - m->header->body_size;
added = padding + sz;
/* Check for 32bit overflows */
if (end_body > (size_t) ((uint32_t) -1)) {
m->poisoned = true;
return NULL;
}
add_new_part =
m->n_body_parts <= 0 ||
m->body_end->sealed ||
padding != ALIGN_TO(m->body_end->size, align) - m->body_end->size;
if (add_new_part) {
if (padding > 0) {
part = message_append_part(m);
if (!part)
return NULL;
part_zero(part, padding);
}
part = message_append_part(m);
if (!part)
return NULL;
r = part_make_space(m, part, sz, &p);
if (r < 0)
return NULL;
} else {
struct bus_container *c;
void *op;
size_t os;
part = m->body_end;
op = part->data;
os = part->size;
start_part = ALIGN_TO(part->size, align);
end_part = start_part + sz;
r = part_make_space(m, part, end_part, &p);
if (r < 0)
return NULL;
if (padding > 0) {
memset(p, 0, padding);
p = (uint8_t*) p + padding;
}
/* Readjust pointers */
for (c = m->containers; c < m->containers + m->n_containers; c++)
c->array_size = adjust_pointer(c->array_size, op, os, part->data);
m->error.message = (const char*) adjust_pointer(m->error.message, op, os, part->data);
}
m->header->body_size = end_body;
message_extend_containers(m, added);
return p;
}
int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored) {
struct bus_container *c;
ssize_t align, sz;
uint32_t k;
void *a;
int fd = -1;
uint32_t fdi = 0;
int r;
if (!m)
return -EINVAL;
if (!p)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!bus_type_is_basic(type))
return -EINVAL;
if (m->poisoned)
return -ESTALE;
c = message_get_container(m);
if (c->signature && c->signature[c->index]) {
/* Container signature is already set */
if (c->signature[c->index] != type)
return -ENXIO;
} else {
char *e;
/* Maybe we can append to the signature? But only if this is the top-level container*/
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(type), NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
}
switch (type) {
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
align = 4;
sz = 4 + strlen(p) + 1;
break;
case SD_BUS_TYPE_SIGNATURE:
align = 1;
sz = 1 + strlen(p) + 1;
break;
case SD_BUS_TYPE_BOOLEAN:
align = sz = 4;
assert_cc(sizeof(int) == sizeof(uint32_t));
memcpy(&k, p, 4);
k = !!k;
p = &k;
break;
case SD_BUS_TYPE_UNIX_FD: {
int z, *f;
if (!m->allow_fds) {
r = -ENOTSUP;
goto fail;
}
align = sz = 4;
z = *(int*) p;
if (z < 0) {
r = -EINVAL;
goto fail;
}
fd = fcntl(z, F_DUPFD_CLOEXEC, 3);
if (fd < 0) {
r = -errno;
goto fail;
}
f = realloc(m->fds, sizeof(int) * (m->n_fds + 1));
if (!f) {
m->poisoned = true;
r = -ENOMEM;
goto fail;
}
fdi = m->n_fds;
f[fdi] = fd;
m->fds = f;
m->free_fds = true;
break;
}
default:
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
break;
}
assert(align > 0);
assert(sz > 0);
a = message_extend_body(m, align, sz);
if (!a) {
r = -ENOMEM;
goto fail;
}
if (type == SD_BUS_TYPE_STRING || type == SD_BUS_TYPE_OBJECT_PATH) {
*(uint32_t*) a = sz - 5;
memcpy((uint8_t*) a + 4, p, sz - 4);
if (stored)
*stored = (const uint8_t*) a + 4;
} else if (type == SD_BUS_TYPE_SIGNATURE) {
*(uint8_t*) a = sz - 1;
memcpy((uint8_t*) a + 1, p, sz - 1);
if (stored)
*stored = (const uint8_t*) a + 1;
} else if (type == SD_BUS_TYPE_UNIX_FD) {
*(uint32_t*) a = fdi;
if (stored)
*stored = a;
m->n_fds ++;
} else {
memcpy(a, p, sz);
if (stored)
*stored = a;
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
fail:
if (fd >= 0)
close_nointr_nofail(fd);
return r;
}
int sd_bus_message_append_basic(sd_bus_message *m, char type, const void *p) {
return message_append_basic(m, type, p, NULL);
}
int sd_bus_message_append_string_space(sd_bus_message *m, size_t size, char **s) {
struct bus_container *c;
void *a;
if (!m)
return -EINVAL;
if (!s)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->poisoned)
return -ESTALE;
c = message_get_container(m);
if (c->signature && c->signature[c->index]) {
/* Container signature is already set */
if (c->signature[c->index] != SD_BUS_TYPE_STRING)
return -ENXIO;
} else {
char *e;
/* Maybe we can append to the signature? But only if this is the top-level container*/
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRING), NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
}
a = message_extend_body(m, 4, 4 + size + 1);
if (!a)
return -ENOMEM;
*(uint32_t*) a = size;
*s = (char*) a + 4;
(*s)[size] = 0;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
}
static int bus_message_open_array(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
uint32_t **array_size) {
unsigned nindex;
void *a, *op;
int alignment;
size_t os;
struct bus_body_part *o;
assert(m);
assert(c);
assert(contents);
assert(array_size);
if (!signature_is_single(contents, true))
return -EINVAL;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
if (c->signature && c->signature[c->index]) {
/* Verify the existing signature */
if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!startswith(c->signature + c->index + 1, contents))
return -ENXIO;
nindex = c->index + 1 + strlen(contents);
} else {
char *e;
if (c->enclosing != 0)
return -ENXIO;
/* Extend the existing signature */
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_ARRAY), contents, NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
nindex = e - c->signature;
}
a = message_extend_body(m, 4, 4);
if (!a)
return -ENOMEM;
o = m->body_end;
op = m->body_end->data;
os = m->body_end->size;
/* Add alignment between size and first element */
if (!message_extend_body(m, alignment, 0))
return -ENOMEM;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
/* location of array size might have changed so let's readjust a */
if (o == m->body_end)
a = adjust_pointer(a, op, os, m->body_end->data);
*(uint32_t*) a = 0;
*array_size = a;
return 0;
}
static int bus_message_open_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t l;
void *a;
assert(m);
assert(c);
assert(contents);
if (!signature_is_single(contents, false))
return -EINVAL;
if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
return -EINVAL;
if (c->signature && c->signature[c->index]) {
if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
return -ENXIO;
} else {
char *e;
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_VARIANT), NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
}
l = strlen(contents);
a = message_extend_body(m, 1, 1 + l + 1);
if (!a)
return -ENOMEM;
*(uint8_t*) a = l;
memcpy((uint8_t*) a + 1, contents, l + 1);
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
}
static int bus_message_open_struct(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t nindex;
assert(m);
assert(c);
assert(contents);
if (!signature_is_valid(contents, false))
return -EINVAL;
if (c->signature && c->signature[c->index]) {
size_t l;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
return -ENXIO;
nindex = c->index + 1 + l + 1;
} else {
char *e;
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRUCT_BEGIN), contents, CHAR_TO_STR(SD_BUS_TYPE_STRUCT_END), NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
nindex = e - c->signature;
}
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0))
return -ENOMEM;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
return 0;
}
static int bus_message_open_dict_entry(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t nindex;
assert(m);
assert(c);
assert(contents);
if (!signature_is_pair(contents))
return -EINVAL;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (c->signature && c->signature[c->index]) {
size_t l;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
return -ENXIO;
nindex = c->index + 1 + l + 1;
} else
return -ENXIO;
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0))
return -ENOMEM;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
return 0;
}
int sd_bus_message_open_container(
sd_bus_message *m,
char type,
const char *contents) {
struct bus_container *c, *w;
uint32_t *array_size = NULL;
char *signature;
size_t before;
int r;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!contents)
return -EINVAL;
if (m->poisoned)
return -ESTALE;
/* Make sure we have space for one more container */
w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
if (!w) {
m->poisoned = true;
return -ENOMEM;
}
m->containers = w;
c = message_get_container(m);
signature = strdup(contents);
if (!signature) {
m->poisoned = true;
return -ENOMEM;
}
/* Save old index in the parent container, in case we have to
* abort this container */
c->saved_index = c->index;
before = m->header->body_size;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_open_array(m, c, contents, &array_size);
else if (type == SD_BUS_TYPE_VARIANT)
r = bus_message_open_variant(m, c, contents);
else if (type == SD_BUS_TYPE_STRUCT)
r = bus_message_open_struct(m, c, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_open_dict_entry(m, c, contents);
else
r = -EINVAL;
if (r < 0) {
free(signature);
return r;
}
/* OK, let's fill it in */
w += m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->index = 0;
w->array_size = array_size;
w->before = before;
w->begin = m->rindex;
return 0;
}
int sd_bus_message_close_container(sd_bus_message *m) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->n_containers <= 0)
return -EINVAL;
if (m->poisoned)
return -ESTALE;
c = message_get_container(m);
if (c->enclosing != SD_BUS_TYPE_ARRAY)
if (c->signature && c->signature[c->index] != 0)
return -EINVAL;
free(c->signature);
m->n_containers--;
return 0;
}
typedef struct {
const char *types;
unsigned n_struct;
unsigned n_array;
} TypeStack;
static int type_stack_push(TypeStack *stack, unsigned max, unsigned *i, const char *types, unsigned n_struct, unsigned n_array) {
assert(stack);
assert(max > 0);
if (*i >= max)
return -EINVAL;
stack[*i].types = types;
stack[*i].n_struct = n_struct;
stack[*i].n_array = n_array;
(*i)++;
return 0;
}
static int type_stack_pop(TypeStack *stack, unsigned max, unsigned *i, const char **types, unsigned *n_struct, unsigned *n_array) {
assert(stack);
assert(max > 0);
assert(types);
assert(n_struct);
assert(n_array);
if (*i <= 0)
return 0;
(*i)--;
*types = stack[*i].types;
*n_struct = stack[*i].n_struct;
*n_array = stack[*i].n_array;
return 1;
}
int bus_message_append_ap(
sd_bus_message *m,
const char *types,
va_list ap) {
unsigned n_array, n_struct;
TypeStack stack[BUS_CONTAINER_DEPTH];
unsigned stack_ptr = 0;
int r;
assert(m);
if (!types)
return 0;
n_array = (unsigned) -1;
n_struct = strlen(types);
for (;;) {
const char *t;
if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
if (r < 0)
return r;
if (r == 0)
break;
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
continue;
}
t = types;
if (n_array != (unsigned) -1)
n_array --;
else {
types ++;
n_struct--;
}
switch (*t) {
case SD_BUS_TYPE_BYTE: {
uint8_t x;
x = (uint8_t) va_arg(ap, int);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_UNIX_FD: {
uint32_t x;
/* We assume a boolean is the same as int32_t */
assert_cc(sizeof(int32_t) == sizeof(int));
x = va_arg(ap, uint32_t);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16: {
uint16_t x;
x = (uint16_t) va_arg(ap, int);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE: {
uint64_t x;
x = va_arg(ap, uint64_t);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE: {
const char *x;
x = va_arg(ap, const char*);
r = sd_bus_message_append_basic(m, *t, x);
break;
}
case SD_BUS_TYPE_ARRAY: {
size_t k;
r = signature_element_length(t + 1, &k);
if (r < 0)
return r;
{
char s[k + 1];
memcpy(s, t + 1, k);
s[k] = 0;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, s);
if (r < 0)
return r;
}
if (n_array == (unsigned) -1) {
types += k;
n_struct -= k;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k;
n_array = va_arg(ap, unsigned);
break;
}
case SD_BUS_TYPE_VARIANT: {
const char *s;
s = va_arg(ap, const char*);
if (!s)
return -EINVAL;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_VARIANT, s);
if (r < 0)
return r;
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = s;
n_struct = strlen(s);
n_array = (unsigned) -1;
break;
}
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
size_t k;
r = signature_element_length(t, &k);
if (r < 0)
return r;
{
char s[k - 1];
memcpy(s, t + 1, k - 2);
s[k - 2] = 0;
r = sd_bus_message_open_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
if (r < 0)
return r;
}
if (n_array == (unsigned) -1) {
types += k - 1;
n_struct -= k - 1;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k - 2;
n_array = (unsigned) -1;
break;
}
default:
r = -EINVAL;
}
if (r < 0)
return r;
}
return 0;
}
int sd_bus_message_append(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->poisoned)
return -ESTALE;
if (!types)
return 0;
va_start(ap, types);
r = bus_message_append_ap(m, types, ap);
va_end(ap);
return r;
}
int sd_bus_message_append_array_space(sd_bus_message *m, char type, size_t size, void **ptr) {
ssize_t align, sz;
void *a;
int r;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!bus_type_is_trivial(type))
return -EINVAL;
if (!ptr && size > 0)
return -EINVAL;
if (m->poisoned)
return -ESTALE;
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
assert_se(align > 0);
assert_se(sz > 0);
if (size % sz != 0)
return -EINVAL;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
if (r < 0)
return r;
a = message_extend_body(m, align, size);
if (!a)
return -ENOMEM;
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
*ptr = a;
return 0;
}
int sd_bus_message_append_array(sd_bus_message *m, char type, const void *ptr, size_t size) {
int r;
void *p;
if (!ptr && size > 0)
return -EINVAL;
r = sd_bus_message_append_array_space(m, type, size, &p);
if (r < 0)
return r;
if (size > 0)
memcpy(p, ptr, size);
return 0;
}
int sd_bus_message_append_array_memfd(sd_bus_message *m, char type, sd_memfd *memfd) {
_cleanup_close_ int copy_fd = -1;
struct bus_body_part *part;
ssize_t align, sz;
uint64_t size;
void *a;
int r;
if (!m)
return -EINVAL;
if (!memfd)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!bus_type_is_trivial(type))
return -EINVAL;
if (m->poisoned)
return -ESTALE;
r = sd_memfd_set_sealed(memfd, true);
if (r < 0)
return r;
copy_fd = sd_memfd_dup_fd(memfd);
if (copy_fd < 0)
return copy_fd;
r = sd_memfd_get_size(memfd, &size);
if (r < 0)
return r;
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
assert_se(align > 0);
assert_se(sz > 0);
if (size % sz != 0)
return -EINVAL;
if (size > (uint64_t) (uint32_t) -1)
return -EINVAL;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
if (r < 0)
return r;
a = message_extend_body(m, align, 0);
if (!a)
return -ENOMEM;
part = message_append_part(m);
if (!part)
return -ENOMEM;
part->memfd = copy_fd;
part->sealed = true;
part->size = size;
copy_fd = -1;
message_extend_containers(m, size);
m->header->body_size += size;
return sd_bus_message_close_container(m);
}
int sd_bus_message_append_string_memfd(sd_bus_message *m, sd_memfd *memfd) {
_cleanup_close_ int copy_fd = -1;
struct bus_body_part *part;
struct bus_container *c;
uint64_t size;
void *a;
int r;
assert_return(m, -EINVAL);
assert_return(memfd, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -ESTALE);
r = sd_memfd_set_sealed(memfd, true);
if (r < 0)
return r;
copy_fd = sd_memfd_dup_fd(memfd);
if (copy_fd < 0)
return copy_fd;
r = sd_memfd_get_size(memfd, &size);
if (r < 0)
return r;
/* We require this to be NUL terminated */
if (size == 0)
return -EINVAL;
if (size > (uint64_t) (uint32_t) -1)
return -EINVAL;
c = message_get_container(m);
if (c->signature && c->signature[c->index]) {
/* Container signature is already set */
if (c->signature[c->index] != SD_BUS_TYPE_STRING)
return -ENXIO;
} else {
char *e;
/* Maybe we can append to the signature? But only if this is the top-level container*/
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRING), NULL);
if (!e) {
m->poisoned = true;
return -ENOMEM;
}
}
a = message_extend_body(m, 4, 4);
if (!a)
return -ENOMEM;
*(uint32_t*) a = size - 1;
part = message_append_part(m);
if (!part)
return -ENOMEM;
part->memfd = copy_fd;
part->sealed = true;
part->size = size;
copy_fd = -1;
message_extend_containers(m, size);
m->header->body_size += size;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
}
int sd_bus_message_append_strv(sd_bus_message *m, char **l) {
char **i;
int r;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -ESTALE);
r = sd_bus_message_open_container(m, 'a', "s");
if (r < 0)
return r;
STRV_FOREACH(i, l) {
r = sd_bus_message_append_basic(m, 's', *i);
if (r < 0)
return r;
}
return sd_bus_message_close_container(m);
}
int bus_body_part_map(struct bus_body_part *part) {
void *p;
size_t psz;
assert_se(part);
if (part->data)
return 0;
if (part->size <= 0)
return 0;
/* For smaller zero parts (as used for padding) we don't need to map anything... */
if (part->memfd < 0 && part->is_zero && part->size < 8) {
static const uint8_t zeroes[7] = { };
part->data = (void*) zeroes;
return 0;
}
psz = PAGE_ALIGN(part->size);
if (part->memfd >= 0)
p = mmap(NULL, psz, PROT_READ, MAP_SHARED, part->memfd, 0);
else if (part->is_zero)
p = mmap(NULL, psz, PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
else
return -EINVAL;
if (p == MAP_FAILED)
return -errno;
part->mapped = psz;
part->data = p;
part->munmap_this = true;
return 0;
}
void bus_body_part_unmap(struct bus_body_part *part) {
assert_se(part);
if (part->memfd < 0)
return;
if (!part->data)
return;
if (!part->munmap_this)
return;
assert_se(munmap(part->data, part->mapped) == 0);
part->data = NULL;
part->mapped = 0;
part->munmap_this = false;
return;
}
static int buffer_peek(const void *p, uint32_t sz, size_t *rindex, size_t align, size_t nbytes, void **r) {
size_t k, start, end;
assert(rindex);
assert(align > 0);
start = ALIGN_TO((size_t) *rindex, align);
end = start + nbytes;
if (end > sz)
return -EBADMSG;
/* Verify that padding is 0 */
for (k = *rindex; k < start; k++)
if (((const uint8_t*) p)[k] != 0)
return -EBADMSG;
if (r)
*r = (uint8_t*) p + start;
*rindex = end;
return 1;
}
static bool message_end_of_array(sd_bus_message *m, size_t index) {
struct bus_container *c;
assert(m);
c = message_get_container(m);
if (!c->array_size)
return false;
return index >= c->begin + BUS_MESSAGE_BSWAP32(m, *c->array_size);
}
static struct bus_body_part* find_part(sd_bus_message *m, size_t index, size_t sz, void **p) {
struct bus_body_part *part;
size_t begin;
int r;
assert(m);
if (m->cached_rindex_part && index >= m->cached_rindex_part_begin) {
part = m->cached_rindex_part;
begin = m->cached_rindex_part_begin;
} else {
part = &m->body;
begin = 0;
}
while (part) {
if (index < begin)
return NULL;
if (index + sz <= begin + part->size) {
r = bus_body_part_map(part);
if (r < 0)
return NULL;
if (p)
*p = (uint8_t*) part->data + index - begin;
m->cached_rindex_part = part;
m->cached_rindex_part_begin = begin;
return part;
}
begin += part->size;
part = part->next;
}
return NULL;
}
static int message_peek_body(
sd_bus_message *m,
size_t *rindex,
size_t align,
size_t nbytes,
void **ret) {
size_t k, start, end, padding;
struct bus_body_part *part;
uint8_t *q;
assert(m);
assert(rindex);
assert(align > 0);
if (message_end_of_array(m, *rindex))
return 0;
start = ALIGN_TO((size_t) *rindex, align);
padding = start - *rindex;
end = start + nbytes;
if (end > BUS_MESSAGE_BODY_SIZE(m))
return -EBADMSG;
part = find_part(m, *rindex, padding, (void**) &q);
if (!part)
return -EBADMSG;
if (q) {
/* Verify padding */
for (k = 0; k < padding; k++)
if (q[k] != 0)
return -EBADMSG;
}
part = find_part(m, start, nbytes, (void**) &q);
if (!part || !q)
return -EBADMSG;
*rindex = end;
if (ret)
*ret = q;
return 1;
}
static bool validate_nul(const char *s, size_t l) {
/* Check for NUL chars in the string */
if (memchr(s, 0, l))
return false;
/* Check for NUL termination */
if (s[l] != 0)
return false;
return true;
}
static bool validate_string(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
/* Check if valid UTF8 */
if (!utf8_is_valid(s))
return false;
return true;
}
static bool validate_signature(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
/* Check if valid signature */
if (!signature_is_valid(s, true))
return false;
return true;
}
static bool validate_object_path(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
if (!object_path_is_valid(s))
return false;
return true;
}
int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
struct bus_container *c;
int r;
void *q;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!bus_type_is_basic(type))
return -EINVAL;
if (!p)
return -EINVAL;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (message_end_of_array(m, m->rindex))
return 0;
if (c->signature[c->index] != type)
return -ENXIO;
switch (type) {
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH: {
uint32_t l;
size_t rindex;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 4, 4, &q);
if (r <= 0)
return r;
l = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (type == SD_BUS_TYPE_OBJECT_PATH) {
if (!validate_object_path(q, l))
return -EBADMSG;
} else {
if (!validate_string(q, l))
return -EBADMSG;
}
m->rindex = rindex;
*(const char**) p = q;
break;
}
case SD_BUS_TYPE_SIGNATURE: {
uint8_t l;
size_t rindex;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r <= 0)
return r;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
m->rindex = rindex;
*(const char**) p = q;
break;
}
default: {
ssize_t sz, align;
size_t rindex;
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
assert(align > 0 && sz > 0);
rindex = m->rindex;
r = message_peek_body(m, &rindex, align, sz, &q);
if (r <= 0)
return r;
switch (type) {
case SD_BUS_TYPE_BYTE:
*(uint8_t*) p = *(uint8_t*) q;
break;
case SD_BUS_TYPE_BOOLEAN:
*(unsigned*) p = !!*(uint32_t*) q;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
*(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
*(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
break;
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
*(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
break;
case SD_BUS_TYPE_UNIX_FD: {
uint32_t j;
j = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
if (j >= m->n_fds)
return -EBADMSG;
*(int*) p = m->fds[j];
break;
}
default:
assert_not_reached("Unknown basic type...");
}
m->rindex = rindex;
break;
}
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 1;
}
static int bus_message_enter_array(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
uint32_t **array_size) {
size_t rindex;
void *q;
int r, alignment;
assert(m);
assert(c);
assert(contents);
assert(array_size);
if (!signature_is_single(contents, true))
return -EINVAL;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!startswith(c->signature + c->index + 1, contents))
return -ENXIO;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 4, 4, &q);
if (r <= 0)
return r;
if (BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q) > BUS_ARRAY_MAX_SIZE)
return -EBADMSG;
r = message_peek_body(m, &rindex, alignment, 0, NULL);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + strlen(contents);
m->rindex = rindex;
*array_size = (uint32_t*) q;
return 1;
}
static int bus_message_enter_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t rindex;
uint8_t l;
void *q;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_single(contents, false))
return -EINVAL;
if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
return -ENXIO;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r <= 0)
return r;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
if (!streq(q, contents))
return -ENXIO;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
m->rindex = rindex;
return 1;
}
static int bus_message_enter_struct(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t l;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_valid(contents, false))
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return 0;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
return -ENXIO;
r = message_peek_body(m, &m->rindex, 8, 0, NULL);
if (r <= 0)
return r;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + l + 1;
return 1;
}
static int bus_message_enter_dict_entry(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t l;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_pair(contents))
return -EINVAL;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!c->signature || c->signature[c->index] == 0)
return 0;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
return -ENXIO;
r = message_peek_body(m, &m->rindex, 8, 0, NULL);
if (r <= 0)
return r;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + l + 1;
return 1;
}
int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *contents) {
struct bus_container *c, *w;
uint32_t *array_size = NULL;
char *signature;
size_t before;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!contents)
return -EINVAL;
/*
* We enforce a global limit on container depth, that is much
* higher than the 32 structs and 32 arrays the specification
* mandates. This is simpler to implement for us, and we need
* this only to ensure our container array doesn't grow
* without bounds. We are happy to return any data from a
* message as long as the data itself is valid, even if the
* overall message might be not.
*
* Note that the message signature is validated when
* parsing the headers, and that validation does check the
* 32/32 limit.
*
* Note that the specification defines no limits on the depth
* of stacked variants, but we do.
*/
if (m->n_containers >= BUS_CONTAINER_DEPTH)
return -EBADMSG;
w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
if (!w)
return -ENOMEM;
m->containers = w;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (message_end_of_array(m, m->rindex))
return 0;
signature = strdup(contents);
if (!signature)
return -ENOMEM;
c->saved_index = c->index;
before = m->rindex;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_enter_array(m, c, contents, &array_size);
else if (type == SD_BUS_TYPE_VARIANT)
r = bus_message_enter_variant(m, c, contents);
else if (type == SD_BUS_TYPE_STRUCT)
r = bus_message_enter_struct(m, c, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_enter_dict_entry(m, c, contents);
else
r = -EINVAL;
if (r <= 0) {
free(signature);
return r;
}
/* OK, let's fill it in */
w += m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->index = 0;
w->array_size = array_size;
w->before = before;
w->begin = m->rindex;
return 1;
}
int sd_bus_message_exit_container(sd_bus_message *m) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (m->n_containers <= 0)
return -EINVAL;
c = message_get_container(m);
if (c->enclosing == SD_BUS_TYPE_ARRAY) {
uint32_t l;
l = BUS_MESSAGE_BSWAP32(m, *c->array_size);
if (c->begin + l != m->rindex)
return -EBUSY;
} else {
if (c->signature && c->signature[c->index] != 0)
return -EINVAL;
}
free(c->signature);
m->n_containers--;
return 1;
}
static void message_quit_container(sd_bus_message *m) {
struct bus_container *c;
assert(m);
assert(m->sealed);
assert(m->n_containers > 0);
c = message_get_container(m);
/* Undo seeks */
assert(m->rindex >= c->before);
m->rindex = c->before;
/* Free container */
free(c->signature);
m->n_containers--;
/* Correct index of new top-level container */
c = message_get_container(m);
c->index = c->saved_index;
}
int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
struct bus_container *c;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
goto eof;
if (message_end_of_array(m, m->rindex))
goto eof;
if (bus_type_is_basic(c->signature[c->index])) {
if (contents)
*contents = NULL;
if (type)
*type = c->signature[c->index];
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_ARRAY) {
if (contents) {
size_t l;
char *sig;
r = signature_element_length(c->signature+c->index+1, &l);
if (r < 0)
return r;
assert(l >= 1);
sig = strndup(c->signature + c->index + 1, l);
if (!sig)
return -ENOMEM;
free(m->peeked_signature);
m->peeked_signature = sig;
*contents = sig;
}
if (type)
*type = SD_BUS_TYPE_ARRAY;
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ||
c->signature[c->index] == SD_BUS_TYPE_DICT_ENTRY_BEGIN) {
if (contents) {
size_t l;
char *sig;
r = signature_element_length(c->signature+c->index, &l);
if (r < 0)
return r;
assert(l >= 2);
sig = strndup(c->signature + c->index + 1, l - 2);
if (!sig)
return -ENOMEM;
free(m->peeked_signature);
m->peeked_signature = sig;
*contents = sig;
}
if (type)
*type = c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_VARIANT) {
if (contents) {
size_t rindex, l;
void *q;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r < 0)
return r;
if (r == 0)
goto eof;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
*contents = q;
}
if (type)
*type = SD_BUS_TYPE_VARIANT;
return 1;
}
return -EINVAL;
eof:
if (type)
*type = c->enclosing;
if (contents)
*contents = NULL;
return 0;
}
int sd_bus_message_rewind(sd_bus_message *m, int complete) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (complete) {
message_reset_containers(m);
m->rindex = 0;
m->root_container.index = 0;
c = message_get_container(m);
} else {
c = message_get_container(m);
c->index = 0;
m->rindex = c->begin;
}
return !isempty(c->signature);
}
static int message_read_ap(
sd_bus_message *m,
const char *types,
va_list ap) {
unsigned n_array, n_struct;
TypeStack stack[BUS_CONTAINER_DEPTH];
unsigned stack_ptr = 0;
int r;
assert(m);
if (!types)
return 0;
/* Ideally, we'd just call ourselves recursively on every
* complex type. However, the state of a va_list that is
* passed to a function is undefined after that function
* returns. This means we need to docode the va_list linearly
* in a single stackframe. We hence implement our own
* home-grown stack in an array. */
n_array = (unsigned) -1;
n_struct = strlen(types);
for (;;) {
const char *t;
if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
if (r < 0)
return r;
if (r == 0)
break;
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
continue;
}
t = types;
if (n_array != (unsigned) -1)
n_array --;
else {
types ++;
n_struct--;
}
switch (*t) {
case SD_BUS_TYPE_BYTE:
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE:
case SD_BUS_TYPE_UNIX_FD: {
void *p;
p = va_arg(ap, void*);
r = sd_bus_message_read_basic(m, *t, p);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
break;
}
case SD_BUS_TYPE_ARRAY: {
size_t k;
r = signature_element_length(t + 1, &k);
if (r < 0)
return r;
{
char s[k + 1];
memcpy(s, t + 1, k);
s[k] = 0;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
}
if (n_array == (unsigned) -1) {
types += k;
n_struct -= k;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k;
n_array = va_arg(ap, unsigned);
break;
}
case SD_BUS_TYPE_VARIANT: {
const char *s;
s = va_arg(ap, const char *);
if (!s)
return -EINVAL;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = s;
n_struct = strlen(s);
n_array = (unsigned) -1;
break;
}
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
size_t k;
r = signature_element_length(t, &k);
if (r < 0)
return r;
{
char s[k - 1];
memcpy(s, t + 1, k - 2);
s[k - 2] = 0;
r = sd_bus_message_enter_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
}
if (n_array == (unsigned) -1) {
types += k - 1;
n_struct -= k - 1;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k - 2;
n_array = (unsigned) -1;
break;
}
default:
return -EINVAL;
}
}
return 1;
}
int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!types)
return -EINVAL;
va_start(ap, types);
r = message_read_ap(m, types, ap);
va_end(ap);
return r;
}
int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size) {
struct bus_container *c;
void *p;
size_t sz;
ssize_t align;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!bus_type_is_trivial(type))
return -EINVAL;
if (!ptr)
return -EINVAL;
if (!size)
return -EINVAL;
if (BUS_MESSAGE_NEED_BSWAP(m))
return -ENOTSUP;
align = bus_type_get_alignment(type);
if (align < 0)
return align;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
if (r <= 0)
return r;
c = message_get_container(m);
sz = BUS_MESSAGE_BSWAP32(m, *c->array_size);
r = message_peek_body(m, &m->rindex, align, sz, &p);
if (r < 0)
goto fail;
if (r == 0) {
r = -EBADMSG;
goto fail;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
goto fail;
*ptr = (const void*) p;
*size = sz;
return 1;
fail:
message_quit_container(m);
return r;
}
static int message_peek_fields(
sd_bus_message *m,
size_t *rindex,
size_t align,
size_t nbytes,
void **ret) {
assert(m);
assert(rindex);
assert(align > 0);
return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
}
static int message_peek_field_uint32(
sd_bus_message *m,
size_t *ri,
uint32_t *ret) {
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_fields(m, ri, 4, 4, &q);
if (r < 0)
return r;
if (ret)
*ret = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
return 0;
}
static int message_peek_field_string(
sd_bus_message *m,
bool (*validate)(const char *p),
size_t *ri,
const char **ret) {
uint32_t l;
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_field_uint32(m, ri, &l);
if (r < 0)
return r;
r = message_peek_fields(m, ri, 1, l+1, &q);
if (r < 0)
return r;
if (validate) {
if (!validate_nul(q, l))
return -EBADMSG;
if (!validate(q))
return -EBADMSG;
} else {
if (!validate_string(q, l))
return -EBADMSG;
}
if (ret)
*ret = q;
return 0;
}
static int message_peek_field_signature(
sd_bus_message *m,
size_t *ri,
const char **ret) {
size_t l;
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_fields(m, ri, 1, 1, &q);
if (r < 0)
return r;
l = *(uint8_t*) q;
r = message_peek_fields(m, ri, 1, l+1, &q);
if (r < 0)
return r;
if (!validate_signature(q, l))
return -EBADMSG;
if (ret)
*ret = q;
return 0;
}
static int message_skip_fields(
sd_bus_message *m,
size_t *ri,
uint32_t array_size,
const char **signature) {
size_t original_index;
int r;
assert(m);
assert(ri);
assert(signature);
original_index = *ri;
for (;;) {
char t;
size_t l;
if (array_size != (uint32_t) -1 &&
array_size <= *ri - original_index)
return 0;
t = **signature;
if (!t)
return 0;
if (t == SD_BUS_TYPE_STRING) {
r = message_peek_field_string(m, NULL, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_OBJECT_PATH) {
r = message_peek_field_string(m, object_path_is_valid, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_SIGNATURE) {
r = message_peek_field_signature(m, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (bus_type_is_basic(t)) {
ssize_t align, k;
align = bus_type_get_alignment(t);
k = bus_type_get_size(t);
assert(align > 0 && k > 0);
r = message_peek_fields(m, ri, align, k, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_ARRAY) {
r = signature_element_length(*signature+1, &l);
if (r < 0)
return r;
assert(l >= 1);
{
char sig[l-1], *s;
uint32_t nas;
int alignment;
strncpy(sig, *signature + 1, l-1);
s = sig;
alignment = bus_type_get_alignment(sig[0]);
if (alignment < 0)
return alignment;
r = message_peek_field_uint32(m, ri, &nas);
if (r < 0)
return r;
if (nas > BUS_ARRAY_MAX_SIZE)
return -EBADMSG;
r = message_peek_fields(m, ri, alignment, 0, NULL);
if (r < 0)
return r;
r = message_skip_fields(m, ri, nas, (const char**) &s);
if (r < 0)
return r;
}
(*signature) += 1 + l;
} else if (t == SD_BUS_TYPE_VARIANT) {
const char *s;
r = message_peek_field_signature(m, ri, &s);
if (r < 0)
return r;
r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_STRUCT ||
t == SD_BUS_TYPE_DICT_ENTRY) {
r = signature_element_length(*signature, &l);
if (r < 0)
return r;
assert(l >= 2);
{
char sig[l-1], *s;
strncpy(sig, *signature + 1, l-1);
s = sig;
r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
if (r < 0)
return r;
}
*signature += l;
} else
return -EINVAL;
}
}
int bus_message_parse_fields(sd_bus_message *m) {
size_t ri;
int r;
uint32_t unix_fds = 0;
assert(m);
for (ri = 0; ri < BUS_MESSAGE_FIELDS_SIZE(m); ) {
const char *signature;
uint8_t *header;
r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
if (r < 0)
return r;
r = message_peek_field_signature(m, &ri, &signature);
if (r < 0)
return r;
switch (*header) {
case _SD_BUS_MESSAGE_HEADER_INVALID:
return -EBADMSG;
case SD_BUS_MESSAGE_HEADER_PATH:
if (m->path)
return -EBADMSG;
if (!streq(signature, "o"))
return -EBADMSG;
r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
break;
case SD_BUS_MESSAGE_HEADER_INTERFACE:
if (m->interface)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
break;
case SD_BUS_MESSAGE_HEADER_MEMBER:
if (m->member)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
break;
case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
if (m->error.name)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, error_name_is_valid, &ri, &m->error.name);
break;
case SD_BUS_MESSAGE_HEADER_DESTINATION:
if (m->destination)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
break;
case SD_BUS_MESSAGE_HEADER_SENDER:
if (m->sender)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, service_name_is_valid, &ri, &m->sender);
break;
case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
const char *s;
char *c;
if (m->root_container.signature)
return -EBADMSG;
if (!streq(signature, "g"))
return -EBADMSG;
r = message_peek_field_signature(m, &ri, &s);
if (r < 0)
return r;
c = strdup(s);
if (!c)
return -ENOMEM;
free(m->root_container.signature);
m->root_container.signature = c;
break;
}
case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
if (m->reply_serial != 0)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, &m->reply_serial);
if (r < 0)
return r;
if (m->reply_serial == 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
if (unix_fds != 0)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, &unix_fds);
if (r < 0)
return -EBADMSG;
if (unix_fds == 0)
return -EBADMSG;
break;
default:
r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
}
if (r < 0)
return r;
}
if (m->n_fds != unix_fds)
return -EBADMSG;
if (isempty(m->root_container.signature) != (BUS_MESSAGE_BODY_SIZE(m) == 0))
return -EBADMSG;
switch (m->header->type) {
case SD_BUS_MESSAGE_SIGNAL:
if (!m->path || !m->interface || !m->member)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_CALL:
if (!m->path || !m->member)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_RETURN:
if (m->reply_serial == 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_ERROR:
if (m->reply_serial == 0 || !m->error.name)
return -EBADMSG;
break;
}
/* Try to read the error message, but if we can't it's a non-issue */
if (m->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
sd_bus_message_read(m, "s", &m->error.message);
return 0;
}
int bus_message_seal(sd_bus_message *m, uint64_t serial) {
struct bus_body_part *part;
size_t l, a;
unsigned i;
int r;
assert(m);
if (m->sealed)
return -EPERM;
if (m->n_containers > 0)
return -EBADMSG;
if (m->poisoned)
return -ESTALE;
/* If there's a non-trivial signature set, then add it in here */
if (!isempty(m->root_container.signature)) {
r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
if (r < 0)
return r;
}
if (m->n_fds > 0) {
r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
if (r < 0)
return r;
}
/* Add padding at the end of the fields part, since we know
* the body needs to start at an 8 byte alignment. We made
* sure we allocated enough space for this, so all we need to
* do here is to zero it out. */
l = BUS_MESSAGE_FIELDS_SIZE(m);
a = ALIGN8(l) - l;
if (a > 0)
memset((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 0, a);
/* If this is something we can send as memfd, then let's seal
the memfd now. Note that we can send memfds as payload only
for directed messages, and not for broadcasts. */
if (m->destination && m->bus && m->bus->use_memfd) {
MESSAGE_FOREACH_PART(part, i, m)
if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
bus_body_part_unmap(part);
if (ioctl(part->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) >= 0)
part->sealed = true;
}
}
m->header->serial = serial;
m->sealed = true;
return 0;
}
int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
if (!m)
return -EINVAL;
if (!destination)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->destination)
return -EEXIST;
return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
}
int bus_message_dump(sd_bus_message *m) {
const char *u = NULL, *uu = NULL, *s = NULL;
char **cmdline = NULL;
unsigned level = 1;
int r;
uid_t owner, audit_loginuid;
uint32_t audit_sessionid;
assert(m);
printf("Message %p\n"
"\tn_ref=%u\n"
"\tendian=%c\n"
"\ttype=%i\n"
"\tflags=%u\n"
"\tversion=%u\n"
"\tserial=%u\n"
"\tfields_size=%u\n"
"\tbody_size=%u\n"
"\tpath=%s\n"
"\tinterface=%s\n"
"\tmember=%s\n"
"\tdestination=%s\n"
"\tsender=%s\n"
"\tsignature=%s\n"
"\treply_serial=%u\n"
"\terror.name=%s\n"
"\terror.message=%s\n"
"\tsealed=%s\n"
"\tn_body_parts=%u\n",
m,
m->n_ref,
m->header->endian,
m->header->type,
m->header->flags,
m->header->version,
BUS_MESSAGE_SERIAL(m),
BUS_MESSAGE_FIELDS_SIZE(m),
BUS_MESSAGE_BODY_SIZE(m),
strna(m->path),
strna(m->interface),
strna(m->member),
strna(m->destination),
strna(m->sender),
strna(m->root_container.signature),
m->reply_serial,
strna(m->error.name),
strna(m->error.message),
yes_no(m->sealed),
m->n_body_parts);
if (m->pid != 0)
printf("\tpid=%lu\n", (unsigned long) m->pid);
if (m->tid != 0)
printf("\ttid=%lu\n", (unsigned long) m->tid);
if (m->uid_valid)
printf("\tuid=%lu\n", (unsigned long) m->uid);
if (m->gid_valid)
printf("\tgid=%lu\n", (unsigned long) m->gid);
if (m->pid_starttime != 0)
printf("\tpid_starttime=%llu\n", (unsigned long long) m->pid_starttime);
if (m->monotonic != 0)
printf("\tmonotonic=%llu\n", (unsigned long long) m->monotonic);
if (m->realtime != 0)
printf("\trealtime=%llu\n", (unsigned long long) m->realtime);
if (m->exe)
printf("\texe=[%s]\n", m->exe);
if (m->comm)
printf("\tcomm=[%s]\n", m->comm);
if (m->tid_comm)
printf("\ttid_comm=[%s]\n", m->tid_comm);
if (m->label)
printf("\tlabel=[%s]\n", m->label);
if (m->cgroup)
printf("\tcgroup=[%s]\n", m->cgroup);
sd_bus_message_get_unit(m, &u);
if (u)
printf("\tunit=[%s]\n", u);
sd_bus_message_get_user_unit(m, &uu);
if (uu)
printf("\tuser_unit=[%s]\n", uu);
sd_bus_message_get_session(m, &s);
if (s)
printf("\tsession=[%s]\n", s);
if (sd_bus_message_get_owner_uid(m, &owner) >= 0)
printf("\towner_uid=%lu\n", (unsigned long) owner);
if (sd_bus_message_get_audit_loginuid(m, &audit_loginuid) >= 0)
printf("\taudit_loginuid=%lu\n", (unsigned long) audit_loginuid);
if (sd_bus_message_get_audit_sessionid(m, &audit_sessionid) >= 0)
printf("\taudit_sessionid=%lu\n", (unsigned long) audit_sessionid);
printf("\tCAP_KILL=%i\n", sd_bus_message_has_effective_cap(m, 5));
if (sd_bus_message_get_cmdline(m, &cmdline) >= 0) {
char **c;
fputs("\tcmdline=[", stdout);
STRV_FOREACH(c, cmdline) {
if (c != cmdline)
putchar(' ');
fputs(*c, stdout);
}
fputs("]\n", stdout);
}
r = sd_bus_message_rewind(m, true);
if (r < 0) {
log_error("Failed to rewind: %s", strerror(-r));
return r;
}
printf("BEGIN_MESSAGE \"%s\" {\n", strempty(m->root_container.signature));
for(;;) {
_cleanup_free_ char *prefix = NULL;
const char *contents = NULL;
char type;
union {
uint8_t u8;
uint16_t u16;
int16_t s16;
uint32_t u32;
int32_t s32;
uint64_t u64;
int64_t s64;
double d64;
const char *string;
int i;
} basic;
r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0) {
log_error("Failed to peek type: %s", strerror(-r));
return r;
}
if (r == 0) {
if (level <= 1)
break;
r = sd_bus_message_exit_container(m);
if (r < 0) {
log_error("Failed to exit container: %s", strerror(-r));
return r;
}
level--;
prefix = strrep("\t", level);
if (!prefix)
return log_oom();
if (type == SD_BUS_TYPE_ARRAY)
printf("%s} END_ARRAY \n", prefix);
else if (type == SD_BUS_TYPE_VARIANT)
printf("%s} END_VARIANT\n", prefix);
else if (type == SD_BUS_TYPE_STRUCT)
printf("%s} END_STRUCT\n", prefix);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
printf("%s} END_DICT_ENTRY\n", prefix);
continue;
}
prefix = strrep("\t", level);
if (!prefix)
return log_oom();
if (bus_type_is_container(type) > 0) {
r = sd_bus_message_enter_container(m, type, contents);
if (r < 0) {
log_error("Failed to enter container: %s", strerror(-r));
return r;
}
if (type == SD_BUS_TYPE_ARRAY)
printf("%sBEGIN_ARRAY \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_VARIANT)
printf("%sBEGIN_VARIANT \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_STRUCT)
printf("%sBEGIN_STRUCT \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
printf("%sBEGIN_DICT_ENTRY \"%s\" {\n", prefix, contents);
level ++;
continue;
}
r = sd_bus_message_read_basic(m, type, &basic);
if (r < 0) {
log_error("Failed to get basic: %s", strerror(-r));
return r;
}
switch (type) {
case SD_BUS_TYPE_BYTE:
printf("%sBYTE: %u\n", prefix, basic.u8);
break;
case SD_BUS_TYPE_BOOLEAN:
printf("%sBOOLEAN: %s\n", prefix, yes_no(basic.i));
break;
case SD_BUS_TYPE_INT16:
printf("%sINT16: %i\n", prefix, basic.s16);
break;
case SD_BUS_TYPE_UINT16:
printf("%sUINT16: %u\n", prefix, basic.u16);
break;
case SD_BUS_TYPE_INT32:
printf("%sINT32: %i\n", prefix, basic.s32);
break;
case SD_BUS_TYPE_UINT32:
printf("%sUINT32: %u\n", prefix, basic.u32);
break;
case SD_BUS_TYPE_INT64:
printf("%sINT64: %lli\n", prefix, (long long) basic.s64);
break;
case SD_BUS_TYPE_UINT64:
printf("%sUINT64: %llu\n", prefix, (unsigned long long) basic.u64);
break;
case SD_BUS_TYPE_DOUBLE:
printf("%sDOUBLE: %g\n", prefix, basic.d64);
break;
case SD_BUS_TYPE_STRING:
printf("%sSTRING: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_OBJECT_PATH:
printf("%sOBJECT_PATH: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_SIGNATURE:
printf("%sSIGNATURE: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_UNIX_FD:
printf("%sUNIX_FD: %i\n", prefix, basic.i);
break;
default:
assert_not_reached("Unknown basic type.");
}
}
printf("} END_MESSAGE\n");
return 0;
}
int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
size_t total;
void *p, *e;
unsigned i;
struct bus_body_part *part;
assert(m);
assert(buffer);
assert(sz);
total = BUS_MESSAGE_SIZE(m);
p = malloc(total);
if (!p)
return -ENOMEM;
e = mempcpy(p, m->header, BUS_MESSAGE_BODY_BEGIN(m));
MESSAGE_FOREACH_PART(part, i, m)
e = mempcpy(e, part->data, part->size);
assert(total == (size_t) ((uint8_t*) e - (uint8_t*) p));
*buffer = p;
*sz = total;
return 0;
}
int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
int r;
assert(m);
assert(l);
r = sd_bus_message_enter_container(m, 'a', "s");
if (r < 0)
return r;
for (;;) {
const char *s;
r = sd_bus_message_read_basic(m, 's', &s);
if (r < 0)
return r;
if (r == 0)
break;
r = strv_extend(l, s);
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
return 0;
}
const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
int r;
const char *t = NULL;
unsigned j;
assert(m);
r = sd_bus_message_rewind(m, true);
if (r < 0)
return NULL;
for (j = 0; j <= i; j++) {
char type;
r = sd_bus_message_peek_type(m, &type, NULL);
if (r < 0)
return NULL;
if (type != SD_BUS_TYPE_STRING &&
type != SD_BUS_TYPE_OBJECT_PATH &&
type != SD_BUS_TYPE_SIGNATURE)
return NULL;
r = sd_bus_message_read_basic(m, type, &t);
if (r < 0)
return NULL;
}
return t;
}
bool bus_header_is_complete(struct bus_header *h, size_t size) {
size_t full;
assert(h);
assert(size);
if (size < sizeof(struct bus_header))
return false;
full = sizeof(struct bus_header) +
(h->endian == SD_BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
return size >= full;
}
int bus_header_message_size(struct bus_header *h, size_t *sum) {
size_t fs, bs;
assert(h);
assert(sum);
if (h->endian == SD_BUS_NATIVE_ENDIAN) {
fs = h->fields_size;
bs = h->body_size;
} else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
fs = bswap_32(h->fields_size);
bs = bswap_32(h->body_size);
} else
return -EBADMSG;
*sum = sizeof(struct bus_header) + ALIGN8(fs) + bs;
return 0;
}
int sd_bus_message_get_errno(sd_bus_message *m) {
assert_return(m, -EINVAL);
if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
return 0;
return sd_bus_error_get_errno(&m->error);
}
const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
struct bus_container *c;
if (!m)
return NULL;
c = complete ? &m->root_container : message_get_container(m);
return c->signature ?: "";
}