bus-message.c revision 6cd37a5e59e01f4a2b3f02d9746b3e7417d424e6
/*-*- 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 "memfd-util.h"
#include "sd-bus.h"
#include "bus-message.h"
#include "bus-internal.h"
#include "bus-type.h"
#include "bus-signature.h"
#include "bus-gvariant.h"
#include "bus-util.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) {
assert(part->memfd_offset == 0);
assert(part->data == part->mmap_begin);
bus_kernel_push_memfd(m->bus, part->memfd, part->data, part->mapped, part->allocated);
} else {
if (part->mapped > 0)
assert_se(munmap(part->mmap_begin, part->mapped) == 0);
safe_close(part->memfd);
}
} else if (part->munmap_this)
munmap(part->mmap_begin, 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[i].offsets);
}
free(m->containers);
m->containers = NULL;
m->n_containers = m->containers_allocated = 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->release_kdbus) {
struct kdbus_cmd_free cmd_free = { };
cmd_free.size = sizeof(cmd_free);
cmd_free.flags = 0;
cmd_free.offset = (uint8_t *)m->kdbus - (uint8_t *)m->bus->kdbus_buffer;
(void) ioctl(m->bus->input_fd, KDBUS_CMD_FREE, &cmd_free);
}
if (m->free_kdbus)
free(m->kdbus);
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);
if (m->destination_ptr) {
free(m->destination_ptr);
m->destination_ptr = NULL;
}
message_reset_containers(m);
free(m->root_container.signature);
free(m->root_container.offsets);
free(m->root_container.peeked_signature);
bus_creds_done(&m->creds);
free(m);
}
static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz, bool add_offset) {
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)
memzero((uint8_t*) np + old_size, 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;
if (add_offset) {
if (m->n_header_offsets >= ELEMENTSOF(m->header_offsets))
goto poison;
m->header_offsets[m->n_header_offsets++] = new_size - sizeof(struct bus_header);
}
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);
/* dbus1 doesn't allow strings over 32bit, let's enforce this
* globally, to not risk convertability */
l = strlen(s);
if (l > (size_t) (uint32_t) -1)
return -EINVAL;
/* Signature "(yv)" where the variant contains "s" */
if (BUS_MESSAGE_IS_GVARIANT(m)) {
/* (field id byte + 7x padding, ((string + NUL) + NUL + signature string 's') */
p = message_extend_fields(m, 8, 1 + 7 + l + 1 + 1 + 1, true);
if (!p)
return -ENOMEM;
p[0] = h;
memzero(p+1, 7);
memcpy(p+8, s, l);
p[8+l] = 0;
p[8+l+1] = 0;
p[8+l+2] = type;
if (ret)
*ret = (char*) p + 8;
} else {
/* (field id byte + (signature length + signature 's' + NUL) + (string length + string + NUL)) */
p = message_extend_fields(m, 8, 4 + 4 + l + 1, false);
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);
/* dbus1 doesn't allow signatures over 32bit, let's enforce
* this globally, to not risk convertability */
l = strlen(s);
if (l > 255)
return -EINVAL;
/* Signature "(yv)" where the variant contains "g" */
if (BUS_MESSAGE_IS_GVARIANT(m))
/* For gvariant the serialization is the same as for normal strings */
return message_append_field_string(m, h, 'g', s, ret);
else {
/* (field id byte + (signature length + signature 'g' + NUL) + (string length + string + NUL)) */
p = message_extend_fields(m, 8, 4 + 1 + l + 1, false);
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);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
/* (field id byte + 7x padding + ((value + NUL + signature string 'u') */
p = message_extend_fields(m, 8, 1 + 7 + 4 + 1 + 1, true);
if (!p)
return -ENOMEM;
p[0] = h;
memzero(p+1, 7);
*((uint32_t*) (p + 8)) = x;
p[12] = 0;
p[13] = 'u';
} else {
/* (field id byte + (signature length + signature 'u' + NUL) + value) */
p = message_extend_fields(m, 8, 4 + 4, false);
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(
sd_bus *bus,
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(bus);
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 &&
h->version != 2)
return -EBADMSG;
if (h->serial == 0)
return -EBADMSG;
if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
return -EBADMSG;
if (h->endian != BUS_LITTLE_ENDIAN &&
h->endian != 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->creds.pid = ucred->pid;
m->creds.euid = ucred->uid;
m->creds.egid = ucred->gid;
/* Due to namespace translations some data might be
* missing from this ucred record. */
if (m->creds.pid > 0)
m->creds.mask |= SD_BUS_CREDS_PID;
if (m->creds.euid != UID_INVALID)
m->creds.mask |= SD_BUS_CREDS_EUID;
if (m->creds.egid != GID_INVALID)
m->creds.mask |= SD_BUS_CREDS_EGID;
}
if (label) {
m->creds.label = (char*) m + ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
memcpy(m->creds.label, label, label_sz + 1);
m->creds.mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
}
m->bus = sd_bus_ref(bus);
*ret = m;
return 0;
}
int bus_message_from_malloc(
sd_bus *bus,
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;
size_t sz;
int r;
r = bus_message_from_header(bus, buffer, length, fds, n_fds, ucred, label, 0, &m);
if (r < 0)
return r;
if (length != BUS_MESSAGE_SIZE(m)) {
r = -EBADMSG;
goto fail;
}
sz = length - sizeof(struct bus_header) - ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
if (sz > 0) {
m->n_body_parts = 1;
m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
m->body.size = sz;
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;
assert(bus);
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 = 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);
m->root_container.need_offsets = BUS_MESSAGE_IS_GVARIANT(m);
m->bus = sd_bus_ref(bus);
return m;
}
_public_ int sd_bus_message_new_signal(
sd_bus *bus,
sd_bus_message **m,
const char *path,
const char *interface,
const char *member) {
sd_bus_message *t;
int r;
assert_return(bus, -ENOTCONN);
assert_return(bus->state != BUS_UNSET, -ENOTCONN);
assert_return(object_path_is_valid(path), -EINVAL);
assert_return(interface_name_is_valid(interface), -EINVAL);
assert_return(member_name_is_valid(member), -EINVAL);
assert_return(m, -EINVAL);
t = message_new(bus, SD_BUS_MESSAGE_SIGNAL);
if (!t)
return -ENOMEM;
t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
r = message_append_field_string(t, BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
r = message_append_field_string(t, 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;
}
_public_ int sd_bus_message_new_method_call(
sd_bus *bus,
sd_bus_message **m,
const char *destination,
const char *path,
const char *interface,
const char *member) {
sd_bus_message *t;
int r;
assert_return(bus, -ENOTCONN);
assert_return(bus->state != BUS_UNSET, -ENOTCONN);
assert_return(!destination || service_name_is_valid(destination), -EINVAL);
assert_return(object_path_is_valid(path), -EINVAL);
assert_return(!interface || interface_name_is_valid(interface), -EINVAL);
assert_return(member_name_is_valid(member), -EINVAL);
assert_return(m, -EINVAL);
t = message_new(bus, SD_BUS_MESSAGE_METHOD_CALL);
if (!t)
return -ENOMEM;
r = message_append_field_string(t, BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
if (r < 0)
goto fail;
if (interface) {
r = message_append_field_string(t, BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
}
if (destination) {
r = message_append_field_string(t, 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_message *call,
uint8_t type,
sd_bus_message **m) {
sd_bus_message *t;
int r;
assert_return(call, -EINVAL);
assert_return(call->sealed, -EPERM);
assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
assert_return(call->bus->state != BUS_UNSET, -ENOTCONN);
assert_return(m, -EINVAL);
t = message_new(call->bus, type);
if (!t)
return -ENOMEM;
t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_cookie = BUS_MESSAGE_COOKIE(call);
r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) t->reply_cookie);
if (r < 0)
goto fail;
if (call->sender) {
r = message_append_field_string(t, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->destination);
if (r < 0)
goto fail;
}
t->dont_send = !!(call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED);
t->enforced_reply_signature = call->enforced_reply_signature;
*m = t;
return 0;
fail:
message_free(t);
return r;
}
_public_ int sd_bus_message_new_method_return(
sd_bus_message *call,
sd_bus_message **m) {
return message_new_reply(call, SD_BUS_MESSAGE_METHOD_RETURN, m);
}
_public_ int sd_bus_message_new_method_error(
sd_bus_message *call,
sd_bus_message **m,
const sd_bus_error *e) {
sd_bus_message *t;
int r;
assert_return(sd_bus_error_is_set(e), -EINVAL);
assert_return(m, -EINVAL);
r = message_new_reply(call, SD_BUS_MESSAGE_METHOD_ERROR, &t);
if (r < 0)
return r;
r = message_append_field_string(t, 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;
}
t->error._need_free = -1;
*m = t;
return 0;
fail:
message_free(t);
return r;
}
_public_ int sd_bus_message_new_method_errorf(
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;
assert_return(name, -EINVAL);
assert_return(m, -EINVAL);
va_start(ap, format);
bus_error_setfv(&error, name, format, ap);
va_end(ap);
return sd_bus_message_new_method_error(call, m, &error);
}
_public_ int sd_bus_message_new_method_errno(
sd_bus_message *call,
sd_bus_message **m,
int error,
const sd_bus_error *p) {
_cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
if (sd_bus_error_is_set(p))
return sd_bus_message_new_method_error(call, m, p);
sd_bus_error_set_errno(&berror, error);
return sd_bus_message_new_method_error(call, m, &berror);
}
_public_ int sd_bus_message_new_method_errnof(
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;
va_start(ap, format);
bus_error_set_errnofv(&berror, error, format, ap);
va_end(ap);
return sd_bus_message_new_method_error(call, m, &berror);
}
void bus_message_set_sender_local(sd_bus *bus, sd_bus_message *m) {
assert(bus);
assert(m);
m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus.Local";
m->creds.well_known_names_local = true;
m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
}
void bus_message_set_sender_driver(sd_bus *bus, sd_bus_message *m) {
assert(bus);
assert(m);
m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
m->creds.well_known_names_driver = true;
m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
}
int bus_message_new_synthetic_error(
sd_bus *bus,
uint64_t cookie,
const sd_bus_error *e,
sd_bus_message **m) {
sd_bus_message *t;
int r;
assert(bus);
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 |= BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_cookie = cookie;
r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) t->reply_cookie);
if (r < 0)
goto fail;
if (bus && bus->unique_name) {
r = message_append_field_string(t, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, bus->unique_name, &t->destination);
if (r < 0)
goto fail;
}
r = message_append_field_string(t, 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;
}
t->error._need_free = -1;
bus_message_set_sender_driver(bus, t);
*m = t;
return 0;
fail:
message_free(t);
return r;
}
_public_ sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
assert_return(m, NULL);
assert(m->n_ref > 0);
m->n_ref++;
return m;
}
_public_ 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)
return NULL;
message_free(m);
return NULL;
}
_public_ int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
assert_return(m, -EINVAL);
assert_return(type, -EINVAL);
*type = m->header->type;
return 0;
}
_public_ int sd_bus_message_get_cookie(sd_bus_message *m, uint64_t *cookie) {
assert_return(m, -EINVAL);
assert_return(cookie, -EINVAL);
assert_return(m->header->serial != 0, -ENODATA);
*cookie = BUS_MESSAGE_COOKIE(m);
return 0;
}
_public_ int sd_bus_message_get_reply_cookie(sd_bus_message *m, uint64_t *cookie) {
assert_return(m, -EINVAL);
assert_return(cookie, -EINVAL);
assert_return(m->reply_cookie != 0, -ENODATA);
*cookie = m->reply_cookie;
return 0;
}
_public_ int sd_bus_message_get_expect_reply(sd_bus_message *m) {
assert_return(m, -EINVAL);
return m->header->type == SD_BUS_MESSAGE_METHOD_CALL &&
!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED);
}
_public_ int sd_bus_message_get_auto_start(sd_bus_message *m) {
assert_return(m, -EINVAL);
return !(m->header->flags & BUS_MESSAGE_NO_AUTO_START);
}
_public_ int sd_bus_message_get_allow_interactive_authorization(sd_bus_message *m) {
assert_return(m, -EINVAL);
return m->header->type == SD_BUS_MESSAGE_METHOD_CALL &&
(m->header->flags & BUS_MESSAGE_ALLOW_INTERACTIVE_AUTHORIZATION);
}
_public_ const char *sd_bus_message_get_path(sd_bus_message *m) {
assert_return(m, NULL);
return m->path;
}
_public_ const char *sd_bus_message_get_interface(sd_bus_message *m) {
assert_return(m, NULL);
return m->interface;
}
_public_ const char *sd_bus_message_get_member(sd_bus_message *m) {
assert_return(m, NULL);
return m->member;
}
_public_ const char *sd_bus_message_get_destination(sd_bus_message *m) {
assert_return(m, NULL);
return m->destination;
}
_public_ const char *sd_bus_message_get_sender(sd_bus_message *m) {
assert_return(m, NULL);
return m->sender;
}
_public_ const sd_bus_error *sd_bus_message_get_error(sd_bus_message *m) {
assert_return(m, NULL);
assert_return(sd_bus_error_is_set(&m->error), NULL);
return &m->error;
}
_public_ int sd_bus_message_get_monotonic_usec(sd_bus_message *m, uint64_t *usec) {
assert_return(m, -EINVAL);
assert_return(usec, -EINVAL);
if (m->monotonic <= 0)
return -ENODATA;
*usec = m->monotonic;
return 0;
}
_public_ int sd_bus_message_get_realtime_usec(sd_bus_message *m, uint64_t *usec) {
assert_return(m, -EINVAL);
assert_return(usec, -EINVAL);
if (m->realtime <= 0)
return -ENODATA;
*usec = m->realtime;
return 0;
}
_public_ int sd_bus_message_get_seqnum(sd_bus_message *m, uint64_t *seqnum) {
assert_return(m, -EINVAL);
assert_return(seqnum, -EINVAL);
if (m->seqnum <= 0)
return -ENODATA;
*seqnum = m->seqnum;
return 0;
}
_public_ sd_bus_creds *sd_bus_message_get_creds(sd_bus_message *m) {
assert_return(m, NULL);
if (m->creds.mask == 0)
return NULL;
return &m->creds;
}
_public_ int sd_bus_message_is_signal(sd_bus_message *m,
const char *interface,
const char *member) {
assert_return(m, -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;
}
_public_ int sd_bus_message_is_method_call(sd_bus_message *m,
const char *interface,
const char *member) {
assert_return(m, -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;
}
_public_ int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
assert_return(m, -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;
}
_public_ int sd_bus_message_set_expect_reply(sd_bus_message *m, int b) {
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EPERM);
if (b)
m->header->flags &= ~BUS_MESSAGE_NO_REPLY_EXPECTED;
else
m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
return 0;
}
_public_ int sd_bus_message_set_auto_start(sd_bus_message *m, int b) {
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
if (b)
m->header->flags &= ~BUS_MESSAGE_NO_AUTO_START;
else
m->header->flags |= BUS_MESSAGE_NO_AUTO_START;
return 0;
}
_public_ int sd_bus_message_set_allow_interactive_authorization(sd_bus_message *m, int b) {
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
if (b)
m->header->flags |= BUS_MESSAGE_ALLOW_INTERACTIVE_AUTHORIZATION;
else
m->header->flags &= ~BUS_MESSAGE_ALLOW_INTERACTIVE_AUTHORIZATION;
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, &part->allocated);
part->mmap_begin = part->data;
}
if (part->memfd >= 0) {
if (part->allocated == 0 || sz > part->allocated) {
uint64_t new_allocated;
new_allocated = PAGE_ALIGN(sz > 0 ? 2 * sz : 1);
r = memfd_set_size(part->memfd, new_allocated);
if (r < 0) {
m->poisoned = true;
return r;
}
part->allocated = new_allocated;
}
if (!part->data || sz > part->mapped) {
size_t psz;
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->mmap_begin, part->mapped, psz, MREMAP_MAYMOVE);
if (n == MAP_FAILED) {
m->poisoned = true;
return -errno;
}
part->mmap_begin = part->data = n;
part->mapped = psz;
part->memfd_offset = 0;
}
part->munmap_this = true;
} else {
if (part->allocated == 0 || sz > part->allocated) {
size_t new_allocated;
new_allocated = sz > 0 ? 2 * sz : 64;
n = realloc(part->data, new_allocated);
if (!n) {
m->poisoned = true;
return -ENOMEM;
}
part->data = n;
part->allocated = new_allocated;
part->free_this = true;
}
}
if (q)
*q = part->data ? (uint8_t*) part->data + part->size : NULL;
part->size = sz;
return 0;
}
static int message_add_offset(sd_bus_message *m, size_t offset) {
struct bus_container *c;
assert(m);
assert(BUS_MESSAGE_IS_GVARIANT(m));
/* Add offset to current container, unless this is the first
* item in it, which will have the 0 offset, which we can
* ignore. */
c = message_get_container(m);
if (!c->need_offsets)
return 0;
if (!GREEDY_REALLOC(c->offsets, c->offsets_allocated, c->n_offsets + 1))
return -ENOMEM;
c->offsets[c->n_offsets++] = offset;
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, bool add_offset) {
size_t start_body, end_body, padding, added;
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;
}
if (added > 0) {
struct bus_body_part *part = NULL;
bool add_new_part;
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, start_part, end_part;
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) {
memzero(p, 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);
}
} else
/* Return something that is not NULL and is aligned */
p = (uint8_t *) NULL + align;
m->header->body_size = end_body;
message_extend_containers(m, added);
if (add_offset) {
r = message_add_offset(m, end_body);
if (r < 0) {
m->poisoned = true;
return NULL;
}
}
return p;
}
static int message_push_fd(sd_bus_message *m, int fd) {
int *f, copy;
assert(m);
if (fd < 0)
return -EINVAL;
if (!m->allow_fds)
return -ENOTSUP;
copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
if (copy < 0)
return -errno;
f = realloc(m->fds, sizeof(int) * (m->n_fds + 1));
if (!f) {
m->poisoned = true;
safe_close(copy);
return -ENOMEM;
}
m->fds = f;
m->fds[m->n_fds] = copy;
m->free_fds = true;
return copy;
}
int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored) {
_cleanup_close_ int fd = -1;
struct bus_container *c;
ssize_t align, sz;
void *a;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(bus_type_is_basic(type), -EINVAL);
assert_return(!m->poisoned, -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;
}
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
uint8_t u8;
uint32_t u32;
switch (type) {
case SD_BUS_TYPE_SIGNATURE:
case SD_BUS_TYPE_STRING:
p = strempty(p);
/* Fall through... */
case SD_BUS_TYPE_OBJECT_PATH:
if (!p)
return -EINVAL;
align = 1;
sz = strlen(p) + 1;
break;
case SD_BUS_TYPE_BOOLEAN:
u8 = p && *(int*) p;
p = &u8;
align = sz = 1;
break;
case SD_BUS_TYPE_UNIX_FD:
if (!p)
return -EINVAL;
fd = message_push_fd(m, *(int*) p);
if (fd < 0)
return fd;
u32 = m->n_fds;
p = &u32;
align = sz = 4;
break;
default:
align = bus_gvariant_get_alignment(CHAR_TO_STR(type));
sz = bus_gvariant_get_size(CHAR_TO_STR(type));
break;
}
assert(align > 0);
assert(sz > 0);
a = message_extend_body(m, align, sz, true);
if (!a)
return -ENOMEM;
memcpy(a, p, sz);
if (stored)
*stored = (const uint8_t*) a;
} else {
uint32_t u32;
switch (type) {
case SD_BUS_TYPE_STRING:
/* To make things easy we'll serialize a NULL string
* into the empty string */
p = strempty(p);
/* Fall through... */
case SD_BUS_TYPE_OBJECT_PATH:
if (!p)
return -EINVAL;
align = 4;
sz = 4 + strlen(p) + 1;
break;
case SD_BUS_TYPE_SIGNATURE:
p = strempty(p);
align = 1;
sz = 1 + strlen(p) + 1;
break;
case SD_BUS_TYPE_BOOLEAN:
u32 = p && *(int*) p;
p = &u32;
align = sz = 4;
break;
case SD_BUS_TYPE_UNIX_FD:
if (!p)
return -EINVAL;
fd = message_push_fd(m, *(int*) p);
if (fd < 0)
return fd;
u32 = m->n_fds;
p = &u32;
align = sz = 4;
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, false);
if (!a)
return -ENOMEM;
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 - 2;
memcpy((uint8_t*) a + 1, p, sz - 1);
if (stored)
*stored = (const uint8_t*) a + 1;
} else {
memcpy(a, p, sz);
if (stored)
*stored = a;
}
}
if (type == SD_BUS_TYPE_UNIX_FD)
m->n_fds ++;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
fd = -1;
return 0;
}
_public_ int sd_bus_message_append_basic(sd_bus_message *m, char type, const void *p) {
return message_append_basic(m, type, p, NULL);
}
_public_ int sd_bus_message_append_string_space(
sd_bus_message *m,
size_t size,
char **s) {
struct bus_container *c;
void *a;
assert_return(m, -EINVAL);
assert_return(s, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -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;
}
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
a = message_extend_body(m, 1, size + 1, true);
if (!a)
return -ENOMEM;
*s = a;
} else {
a = message_extend_body(m, 4, 4 + size + 1, false);
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;
}
_public_ int sd_bus_message_append_string_iovec(
sd_bus_message *m,
const struct iovec *iov,
unsigned n) {
size_t size;
unsigned i;
char *p;
int r;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(iov || n == 0, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
size = IOVEC_TOTAL_SIZE(iov, n);
r = sd_bus_message_append_string_space(m, size, &p);
if (r < 0)
return r;
for (i = 0; i < n; i++) {
if (iov[i].iov_base)
memcpy(p, iov[i].iov_base, iov[i].iov_len);
else
memset(p, ' ', iov[i].iov_len);
p += iov[i].iov_len;
}
return 0;
}
static int bus_message_open_array(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
uint32_t **array_size,
size_t *begin,
bool *need_offsets) {
unsigned nindex;
int alignment, r;
assert(m);
assert(c);
assert(contents);
assert(array_size);
assert(begin);
assert(need_offsets);
if (!signature_is_single(contents, true))
return -EINVAL;
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;
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
alignment = bus_gvariant_get_alignment(contents);
if (alignment < 0)
return alignment;
/* Add alignment padding and add to offset list */
if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
*begin = m->header->body_size;
*need_offsets = r == 0;
} else {
void *a, *op;
size_t os;
struct bus_body_part *o;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
a = message_extend_body(m, 4, 4, false);
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, false))
return -ENOMEM;
/* 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;
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
return 0;
}
static int bus_message_open_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
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;
}
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
/* Variants are always aligned to 8 */
if (!message_extend_body(m, 8, 0, false))
return -ENOMEM;
} else {
size_t l;
void *a;
l = strlen(contents);
a = message_extend_body(m, 1, 1 + l + 1, false);
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 *begin,
bool *need_offsets) {
size_t nindex;
int r;
assert(m);
assert(c);
assert(contents);
assert(begin);
assert(need_offsets);
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;
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
int alignment;
alignment = bus_gvariant_get_alignment(contents);
if (alignment < 0)
return alignment;
if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
*begin = m->header->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0, false))
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 *begin,
bool *need_offsets) {
int r;
assert(m);
assert(c);
assert(contents);
assert(begin);
assert(need_offsets);
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;
} else
return -ENXIO;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
int alignment;
alignment = bus_gvariant_get_alignment(contents);
if (alignment < 0)
return alignment;
if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
*begin = m->header->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0, false))
return -ENOMEM;
}
return 0;
}
_public_ 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, begin = 0;
bool need_offsets = false;
int r;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(contents, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
/* Make sure we have space for one more container */
if (!GREEDY_REALLOC(m->containers, m->containers_allocated, m->n_containers + 1)) {
m->poisoned = true;
return -ENOMEM;
}
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, &begin, &need_offsets);
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, &begin, &need_offsets);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_open_dict_entry(m, c, contents, &begin, &need_offsets);
else
r = -EINVAL;
if (r < 0) {
free(signature);
return r;
}
/* OK, let's fill it in */
w = m->containers + m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->index = 0;
w->array_size = array_size;
w->before = before;
w->begin = begin;
w->n_offsets = w->offsets_allocated = 0;
w->offsets = NULL;
w->need_offsets = need_offsets;
return 0;
}
static size_t determine_word_size(size_t sz, size_t extra) {
if (sz + extra <= 0xFF)
return 1;
else if (sz + extra*2 <= 0xFFFF)
return 2;
else if (sz + extra*4 <= 0xFFFFFFFF)
return 4;
else
return 8;
}
static size_t read_word_le(void *p, size_t sz) {
union {
uint16_t u16;
uint32_t u32;
uint64_t u64;
} x;
assert(p);
if (sz == 1)
return *(uint8_t*) p;
memcpy(&x, p, sz);
if (sz == 2)
return le16toh(x.u16);
else if (sz == 4)
return le32toh(x.u32);
else if (sz == 8)
return le64toh(x.u64);
assert_not_reached("unknown word width");
}
static void write_word_le(void *p, size_t sz, size_t value) {
union {
uint16_t u16;
uint32_t u32;
uint64_t u64;
} x;
assert(p);
assert(sz == 8 || (value < (1ULL << (sz*8))));
if (sz == 1) {
*(uint8_t*) p = value;
return;
} else if (sz == 2)
x.u16 = htole16((uint16_t) value);
else if (sz == 4)
x.u32 = htole32((uint32_t) value);
else if (sz == 8)
x.u64 = htole64((uint64_t) value);
else
assert_not_reached("unknown word width");
memcpy(p, &x, sz);
}
static int bus_message_close_array(sd_bus_message *m, struct bus_container *c) {
assert(m);
assert(c);
if (!BUS_MESSAGE_IS_GVARIANT(m))
return 0;
if (c->need_offsets) {
size_t payload, sz, i;
uint8_t *a;
/* Variable-width arrays */
payload = c->n_offsets > 0 ? c->offsets[c->n_offsets-1] - c->begin : 0;
sz = determine_word_size(payload, c->n_offsets);
a = message_extend_body(m, 1, sz * c->n_offsets, true);
if (!a)
return -ENOMEM;
for (i = 0; i < c->n_offsets; i++)
write_word_le(a + sz*i, sz, c->offsets[i] - c->begin);
} else {
void *a;
/* Fixed-width or empty arrays */
a = message_extend_body(m, 1, 0, true); /* let's add offset to parent */
if (!a)
return -ENOMEM;
}
return 0;
}
static int bus_message_close_variant(sd_bus_message *m, struct bus_container *c) {
uint8_t *a;
size_t l;
assert(m);
assert(c);
assert(c->signature);
if (!BUS_MESSAGE_IS_GVARIANT(m))
return 0;
l = strlen(c->signature);
a = message_extend_body(m, 1, 1 + l, true);
if (!a)
return -ENOMEM;
a[0] = 0;
memcpy(a+1, c->signature, l);
return 0;
}
static int bus_message_close_struct(sd_bus_message *m, struct bus_container *c, bool add_offset) {
size_t n_variable = 0;
unsigned i = 0;
const char *p;
uint8_t *a;
int r;
assert(m);
assert(c);
if (!BUS_MESSAGE_IS_GVARIANT(m))
return 0;
p = strempty(c->signature);
while (*p != 0) {
size_t n;
r = signature_element_length(p, &n);
if (r < 0)
return r;
else {
char t[n+1];
memcpy(t, p, n);
t[n] = 0;
r = bus_gvariant_is_fixed_size(t);
if (r < 0)
return r;
}
assert(!c->need_offsets || i <= c->n_offsets);
/* We need to add an offset for each item that has a
* variable size and that is not the last one in the
* list */
if (r == 0 && p[n] != 0)
n_variable++;
i++;
p += n;
}
assert(!c->need_offsets || i == c->n_offsets);
assert(c->need_offsets || n_variable == 0);
if (n_variable <= 0) {
a = message_extend_body(m, 1, 0, add_offset);
if (!a)
return -ENOMEM;
} else {
size_t sz;
unsigned j;
assert(c->offsets[c->n_offsets-1] == m->header->body_size);
sz = determine_word_size(m->header->body_size - c->begin, n_variable);
a = message_extend_body(m, 1, sz * n_variable, add_offset);
if (!a)
return -ENOMEM;
p = strempty(c->signature);
for (i = 0, j = 0; i < c->n_offsets; i++) {
unsigned k;
size_t n;
r = signature_element_length(p, &n);
if (r < 0)
return r;
else {
char t[n+1];
memcpy(t, p, n);
t[n] = 0;
p += n;
r = bus_gvariant_is_fixed_size(t);
if (r < 0)
return r;
if (r > 0 || p[0] == 0)
continue;
}
k = n_variable - 1 - j;
write_word_le(a + k * sz, sz, c->offsets[i] - c->begin);
j++;
}
}
return 0;
}
_public_ int sd_bus_message_close_container(sd_bus_message *m) {
struct bus_container *c;
int r;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(m->n_containers > 0, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
c = message_get_container(m);
if (c->enclosing != SD_BUS_TYPE_ARRAY)
if (c->signature && c->signature[c->index] != 0)
return -EINVAL;
m->n_containers--;
if (c->enclosing == SD_BUS_TYPE_ARRAY)
r = bus_message_close_array(m, c);
else if (c->enclosing == SD_BUS_TYPE_VARIANT)
r = bus_message_close_variant(m, c);
else if (c->enclosing == SD_BUS_TYPE_STRUCT || c->enclosing == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_close_struct(m, c, true);
else
assert_not_reached("Unknown container type");
free(c->signature);
free(c->offsets);
return r;
}
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: {
uint64_t x;
x = va_arg(ap, uint64_t);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_DOUBLE: {
double x;
x = va_arg(ap, double);
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 1;
}
_public_ int sd_bus_message_append(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
assert_return(m, -EINVAL);
assert_return(types, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -ESTALE);
va_start(ap, types);
r = bus_message_append_ap(m, types, ap);
va_end(ap);
return r;
}
_public_ 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;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(bus_type_is_trivial(type) && type != SD_BUS_TYPE_BOOLEAN, -EINVAL);
assert_return(ptr || size == 0, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
/* alignment and size of the trivial types (except bool) is
* identical for gvariant and dbus1 marshalling */
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, false);
if (!a)
return -ENOMEM;
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
*ptr = a;
return 0;
}
_public_ int sd_bus_message_append_array(
sd_bus_message *m,
char type,
const void *ptr,
size_t size) {
int r;
void *p;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(bus_type_is_trivial(type), -EINVAL);
assert_return(ptr || size == 0, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
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;
}
_public_ int sd_bus_message_append_array_iovec(
sd_bus_message *m,
char type,
const struct iovec *iov,
unsigned n) {
size_t size;
unsigned i;
void *p;
int r;
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(bus_type_is_trivial(type), -EINVAL);
assert_return(iov || n == 0, -EINVAL);
assert_return(!m->poisoned, -ESTALE);
size = IOVEC_TOTAL_SIZE(iov, n);
r = sd_bus_message_append_array_space(m, type, size, &p);
if (r < 0)
return r;
for (i = 0; i < n; i++) {
if (iov[i].iov_base)
memcpy(p, iov[i].iov_base, iov[i].iov_len);
else
memzero(p, iov[i].iov_len);
p = (uint8_t*) p + iov[i].iov_len;
}
return 0;
}
_public_ int sd_bus_message_append_array_memfd(
sd_bus_message *m,
char type,
int memfd,
uint64_t offset,
uint64_t size) {
_cleanup_close_ int copy_fd = -1;
struct bus_body_part *part;
ssize_t align, sz;
uint64_t real_size;
void *a;
int r;
assert_return(m, -EINVAL);
assert_return(memfd >= 0, -EINVAL);
assert_return(bus_type_is_trivial(type), -EINVAL);
assert_return(size > 0, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -ESTALE);
r = memfd_set_sealed(memfd);
if (r < 0)
return r;
copy_fd = dup(memfd);
if (copy_fd < 0)
return copy_fd;
r = memfd_get_size(memfd, &real_size);
if (r < 0)
return r;
if (offset == 0 && size == (uint64_t) -1)
size = real_size;
else if (offset + size > real_size)
return -EMSGSIZE;
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
assert_se(align > 0);
assert_se(sz > 0);
if (offset % align != 0)
return -EINVAL;
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, false);
if (!a)
return -ENOMEM;
part = message_append_part(m);
if (!part)
return -ENOMEM;
part->memfd = copy_fd;
part->memfd_offset = offset;
part->sealed = true;
part->size = size;
copy_fd = -1;
m->header->body_size += size;
message_extend_containers(m, size);
return sd_bus_message_close_container(m);
}
_public_ int sd_bus_message_append_string_memfd(
sd_bus_message *m,
int memfd,
uint64_t offset,
uint64_t size) {
_cleanup_close_ int copy_fd = -1;
struct bus_body_part *part;
struct bus_container *c;
uint64_t real_size;
void *a;
int r;
assert_return(m, -EINVAL);
assert_return(memfd >= 0, -EINVAL);
assert_return(size > 0, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->poisoned, -ESTALE);
r = memfd_set_sealed(memfd);
if (r < 0)
return r;
copy_fd = dup(memfd);
if (copy_fd < 0)
return copy_fd;
r = memfd_get_size(memfd, &real_size);
if (r < 0)
return r;
if (offset == 0 && size == (uint64_t) -1)
size = real_size;
else if (offset + size > real_size)
return -EMSGSIZE;
/* 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;
}
}
if (!BUS_MESSAGE_IS_GVARIANT(m)) {
a = message_extend_body(m, 4, 4, false);
if (!a)
return -ENOMEM;
*(uint32_t*) a = size - 1;
}
part = message_append_part(m);
if (!part)
return -ENOMEM;
part->memfd = copy_fd;
part->memfd_offset = offset;
part->sealed = true;
part->size = size;
copy_fd = -1;
m->header->body_size += size;
message_extend_containers(m, size);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
r = message_add_offset(m, m->header->body_size);
if (r < 0) {
m->poisoned = true;
return -ENOMEM;
}
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
}
_public_ 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);
}
static int bus_message_close_header(sd_bus_message *m) {
uint8_t *a;
size_t sz, i;
assert(m);
if (!BUS_MESSAGE_IS_GVARIANT(m))
return 0;
if (m->n_header_offsets < 1)
return 0;
assert(m->header->fields_size == m->header_offsets[m->n_header_offsets-1]);
sz = determine_word_size(m->header->fields_size, m->n_header_offsets);
a = message_extend_fields(m, 1, sz * m->n_header_offsets, false);
if (!a)
return -ENOMEM;
for (i = 0; i < m->n_header_offsets; i++)
write_word_le(a + sz*i, sz, m->header_offsets[i]);
return 0;
}
int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
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;
/* In vtables the return signature of method calls is listed,
* let's check if they match if this is a response */
if (m->header->type == SD_BUS_MESSAGE_METHOD_RETURN &&
m->enforced_reply_signature &&
!streq(strempty(m->root_container.signature), m->enforced_reply_signature))
return -ENOMSG;
/* If gvariant marshalling is used we need to close the body structure */
r = bus_message_close_struct(m, &m->root_container, false);
if (r < 0)
return r;
/* 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, 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, BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
if (r < 0)
return r;
}
r = bus_message_close_header(m);
if (r < 0)
return r;
m->header->serial = (uint32_t) cookie;
m->timeout = m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED ? 0 : timeout;
/* 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)
memzero((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 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->use_memfd) {
MESSAGE_FOREACH_PART(part, i, m)
if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
uint64_t sz;
/* Try to seal it if that makes
* sense. First, unmap our own map to
* make sure we don't keep it busy. */
bus_body_part_unmap(part);
/* Then, sync up real memfd size */
sz = part->size;
r = memfd_set_size(part->memfd, sz);
if (r < 0)
return r;
/* Finally, try to seal */
if (memfd_set_sealed(part->memfd) >= 0)
part->sealed = true;
}
}
m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
m->root_container.index = 0;
m->root_container.offset_index = 0;
m->root_container.item_size = m->root_container.n_offsets > 0 ? m->root_container.offsets[0] : 0;
m->sealed = true;
return 0;
}
int bus_body_part_map(struct bus_body_part *part) {
void *p;
size_t psz, shift;
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;
}
shift = part->memfd_offset - ((part->memfd_offset / page_size()) * page_size());
psz = PAGE_ALIGN(part->size + shift);
if (part->memfd >= 0)
p = mmap(NULL, psz, PROT_READ, MAP_PRIVATE, part->memfd, part->memfd_offset - shift);
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->mmap_begin = p;
part->data = (uint8_t*) p + shift;
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->mmap_begin)
return;
if (!part->munmap_this)
return;
assert_se(munmap(part->mmap_begin, part->mapped) == 0);
part->mmap_begin = NULL;
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_signature(sd_bus_message *m) {
struct bus_container *c;
assert(m);
c = message_get_container(m);
return !c->signature || c->signature[c->index] == 0;
}
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->enclosing != SD_BUS_TYPE_ARRAY)
return false;
if (BUS_MESSAGE_IS_GVARIANT(m))
return index >= c->end;
else {
assert(c->array_size);
return index >= c->begin + BUS_MESSAGE_BSWAP32(m, *c->array_size);
}
}
_public_ int sd_bus_message_at_end(sd_bus_message *m, int complete) {
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
if (complete && m->n_containers > 0)
return false;
if (message_end_of_signature(m))
return true;
if (message_end_of_array(m, m->rindex))
return true;
return false;
}
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 container_next_item(sd_bus_message *m, struct bus_container *c, size_t *rindex) {
int r;
assert(m);
assert(c);
assert(rindex);
if (!BUS_MESSAGE_IS_GVARIANT(m))
return 0;
if (c->enclosing == SD_BUS_TYPE_ARRAY) {
int sz;
sz = bus_gvariant_get_size(c->signature);
if (sz < 0) {
int alignment;
if (c->offset_index+1 >= c->n_offsets)
goto end;
/* Variable-size array */
alignment = bus_gvariant_get_alignment(c->signature);
assert(alignment > 0);
*rindex = ALIGN_TO(c->offsets[c->offset_index], alignment);
c->item_size = c->offsets[c->offset_index+1] - *rindex;
} else {
if (c->offset_index+1 >= (c->end-c->begin)/sz)
goto end;
/* Fixed-size array */
*rindex = c->begin + (c->offset_index+1) * sz;
c->item_size = sz;
}
c->offset_index++;
} else if (c->enclosing == 0 ||
c->enclosing == SD_BUS_TYPE_STRUCT ||
c->enclosing == SD_BUS_TYPE_DICT_ENTRY) {
int alignment;
size_t n, j;
if (c->offset_index+1 >= c->n_offsets)
goto end;
r = signature_element_length(c->signature + c->index, &n);
if (r < 0)
return r;
r = signature_element_length(c->signature + c->index + n, &j);
if (r < 0)
return r;
else {
char t[j+1];
memcpy(t, c->signature + c->index + n, j);
t[j] = 0;
alignment = bus_gvariant_get_alignment(t);
}
assert(alignment > 0);
*rindex = ALIGN_TO(c->offsets[c->offset_index], alignment);
c->item_size = c->offsets[c->offset_index+1] - *rindex;
c->offset_index++;
} else if (c->enclosing == SD_BUS_TYPE_VARIANT)
goto end;
else
assert_not_reached("Unknown container type");
return 0;
end:
/* Reached the end */
*rindex = c->end;
c->item_size = 0;
return 0;
}
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);
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 || (nbytes > 0 && !q))
return -EBADMSG;
*rindex = end;
if (ret)
*ret = q;
return 0;
}
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;
}
_public_ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
struct bus_container *c;
size_t rindex;
void *q;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(bus_type_is_basic(type), -EINVAL);
if (message_end_of_signature(m))
return -ENXIO;
if (message_end_of_array(m, m->rindex))
return 0;
c = message_get_container(m);
if (c->signature[c->index] != type)
return -ENXIO;
rindex = m->rindex;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
bool ok;
r = message_peek_body(m, &rindex, 1, c->item_size, &q);
if (r < 0)
return r;
if (type == SD_BUS_TYPE_STRING)
ok = validate_string(q, c->item_size-1);
else if (type == SD_BUS_TYPE_OBJECT_PATH)
ok = validate_object_path(q, c->item_size-1);
else
ok = validate_signature(q, c->item_size-1);
if (!ok)
return -EBADMSG;
if (p)
*(const char**) p = q;
} else {
int sz, align;
sz = bus_gvariant_get_size(CHAR_TO_STR(type));
assert(sz > 0);
if ((size_t) sz != c->item_size)
return -EBADMSG;
align = bus_gvariant_get_alignment(CHAR_TO_STR(type));
assert(align > 0);
r = message_peek_body(m, &rindex, align, c->item_size, &q);
if (r < 0)
return r;
switch (type) {
case SD_BUS_TYPE_BYTE:
if (p)
*(uint8_t*) p = *(uint8_t*) q;
break;
case SD_BUS_TYPE_BOOLEAN:
if (p)
*(int*) p = !!*(uint8_t*) q;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
if (p)
*(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
if (p)
*(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:
if (p)
*(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;
if (p)
*(int*) p = m->fds[j];
break;
}
default:
assert_not_reached("unexpected type");
}
}
r = container_next_item(m, c, &rindex);
if (r < 0)
return r;
} else {
rindex = m->rindex;
if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH)) {
uint32_t l;
bool ok;
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 (type == SD_BUS_TYPE_OBJECT_PATH)
ok = validate_object_path(q, l);
else
ok = validate_string(q, l);
if (!ok)
return -EBADMSG;
if (p)
*(const char**) p = q;
} else if (type == SD_BUS_TYPE_SIGNATURE) {
uint8_t l;
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 (!validate_signature(q, l))
return -EBADMSG;
if (p)
*(const char**) p = q;
} else {
ssize_t sz, align;
align = bus_type_get_alignment(type);
assert(align > 0);
sz = bus_type_get_size(type);
assert(sz > 0);
r = message_peek_body(m, &rindex, align, sz, &q);
if (r < 0)
return r;
switch (type) {
case SD_BUS_TYPE_BYTE:
if (p)
*(uint8_t*) p = *(uint8_t*) q;
break;
case SD_BUS_TYPE_BOOLEAN:
if (p)
*(int*) p = !!*(uint32_t*) q;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
if (p)
*(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
if (p)
*(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:
if (p)
*(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;
if (p)
*(int*) p = m->fds[j];
break;
}
default:
assert_not_reached("Unknown basic type...");
}
}
}
m->rindex = rindex;
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 *item_size,
size_t **offsets,
size_t *n_offsets) {
size_t rindex;
void *q;
int r, alignment;
assert(m);
assert(c);
assert(contents);
assert(array_size);
assert(item_size);
assert(offsets);
assert(n_offsets);
if (!signature_is_single(contents, true))
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return -ENXIO;
if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!startswith(c->signature + c->index + 1, contents))
return -ENXIO;
rindex = m->rindex;
if (!BUS_MESSAGE_IS_GVARIANT(m)) {
/* dbus1 */
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;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
r = message_peek_body(m, &rindex, alignment, 0, NULL);
if (r < 0)
return r;
*array_size = (uint32_t*) q;
} else if (c->item_size <= 0) {
/* gvariant: empty array */
*item_size = 0;
*offsets = NULL;
*n_offsets = 0;
} else if (bus_gvariant_is_fixed_size(contents)) {
/* gvariant: fixed length array */
*item_size = bus_gvariant_get_size(contents);
*offsets = NULL;
*n_offsets = 0;
} else {
size_t where, p = 0, framing, sz;
unsigned i;
/* gvariant: variable length array */
sz = determine_word_size(c->item_size, 0);
where = rindex + c->item_size - sz;
r = message_peek_body(m, &where, 1, sz, &q);
if (r < 0)
return r;
framing = read_word_le(q, sz);
if (framing > c->item_size - sz)
return -EBADMSG;
if ((c->item_size - framing) % sz != 0)
return -EBADMSG;
*n_offsets = (c->item_size - framing) / sz;
where = rindex + framing;
r = message_peek_body(m, &where, 1, *n_offsets * sz, &q);
if (r < 0)
return r;
*offsets = new(size_t, *n_offsets);
if (!*offsets)
return -ENOMEM;
for (i = 0; i < *n_offsets; i++) {
size_t x;
x = read_word_le((uint8_t*) q + i * sz, sz);
if (x > c->item_size - sz)
return -EBADMSG;
if (x < p)
return -EBADMSG;
(*offsets)[i] = rindex + x;
p = x;
}
*item_size = (*offsets)[0] - rindex;
}
m->rindex = rindex;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + strlen(contents);
return 1;
}
static int bus_message_enter_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
size_t *item_size) {
size_t rindex;
uint8_t l;
void *q;
int r;
assert(m);
assert(c);
assert(contents);
assert(item_size);
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 -ENXIO;
if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
return -ENXIO;
rindex = m->rindex;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
size_t k, where;
k = strlen(contents);
if (1+k > c->item_size)
return -EBADMSG;
where = rindex + c->item_size - (1+k);
r = message_peek_body(m, &where, 1, 1+k, &q);
if (r < 0)
return r;
if (*(char*) q != 0)
return -EBADMSG;
if (memcmp((uint8_t*) q+1, contents, k))
return -ENXIO;
*item_size = c->item_size - (1+k);
} else {
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 (!validate_signature(q, l))
return -EBADMSG;
if (!streq(q, contents))
return -ENXIO;
}
m->rindex = rindex;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 1;
}
static int build_struct_offsets(
sd_bus_message *m,
const char *signature,
size_t size,
size_t *item_size,
size_t **offsets,
size_t *n_offsets) {
unsigned n_variable = 0, n_total = 0, v;
size_t previous = 0, where;
const char *p;
size_t sz;
void *q;
int r;
assert(m);
assert(item_size);
assert(offsets);
assert(n_offsets);
if (isempty(signature)) {
*item_size = 0;
*offsets = NULL;
*n_offsets = 0;
return 0;
}
sz = determine_word_size(size, 0);
if (sz <= 0)
return -EBADMSG;
/* First, loop over signature and count variable elements and
* elements in general. We use this to know how large the
* offset array is at the end of the structure. Note that
* GVariant only stores offsets for all variable size elements
* that are not the last item. */
p = signature;
while (*p != 0) {
size_t n;
r = signature_element_length(p, &n);
if (r < 0)
return r;
else {
char t[n+1];
memcpy(t, p, n);
t[n] = 0;
r = bus_gvariant_is_fixed_size(t);
}
if (r < 0)
return r;
if (r == 0 && p[n] != 0) /* except the last item */
n_variable ++;
n_total++;
p += n;
}
if (size < n_variable * sz)
return -EBADMSG;
where = m->rindex + size - (n_variable * sz);
r = message_peek_body(m, &where, 1, n_variable * sz, &q);
if (r < 0)
return r;
v = n_variable;
*offsets = new(size_t, n_total);
if (!*offsets)
return -ENOMEM;
*n_offsets = 0;
/* Second, loop again and build an offset table */
p = signature;
while (*p != 0) {
size_t n, offset;
int k;
r = signature_element_length(p, &n);
if (r < 0)
return r;
else {
char t[n+1];
memcpy(t, p, n);
t[n] = 0;
k = bus_gvariant_get_size(t);
if (k < 0) {
size_t x;
/* variable size */
if (v > 0) {
v--;
x = read_word_le((uint8_t*) q + v*sz, sz);
if (x >= size)
return -EBADMSG;
if (m->rindex + x < previous)
return -EBADMSG;
} else
/* The last item's end
* is determined from
* the start of the
* offset array */
x = size - (n_variable * sz);
offset = m->rindex + x;
} else {
size_t align;
/* fixed size */
align = bus_gvariant_get_alignment(t);
assert(align > 0);
offset = (*n_offsets == 0 ? m->rindex : ALIGN_TO((*offsets)[*n_offsets-1], align)) + k;
}
}
previous = (*offsets)[(*n_offsets)++] = offset;
p += n;
}
assert(v == 0);
assert(*n_offsets == n_total);
*item_size = (*offsets)[0] - m->rindex;
return 0;
}
static int enter_struct_or_dict_entry(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
size_t *item_size,
size_t **offsets,
size_t *n_offsets) {
int r;
assert(m);
assert(c);
assert(contents);
assert(item_size);
assert(offsets);
assert(n_offsets);
if (!BUS_MESSAGE_IS_GVARIANT(m)) {
/* dbus1 */
r = message_peek_body(m, &m->rindex, 8, 0, NULL);
if (r < 0)
return r;
} else if (c->item_size <= 0) {
/* gvariant empty struct */
*item_size = 0;
*offsets = NULL;
*n_offsets = 0;
} else
/* gvariant with contents */
return build_struct_offsets(m, contents, c->item_size, item_size, offsets, n_offsets);
return 0;
}
static int bus_message_enter_struct(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
size_t *item_size,
size_t **offsets,
size_t *n_offsets) {
size_t l;
int r;
assert(m);
assert(c);
assert(contents);
assert(item_size);
assert(offsets);
assert(n_offsets);
if (!signature_is_valid(contents, false))
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return -ENXIO;
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 = enter_struct_or_dict_entry(m, c, contents, item_size, offsets, n_offsets);
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 *item_size,
size_t **offsets,
size_t *n_offsets) {
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 = enter_struct_or_dict_entry(m, c, contents, item_size, offsets, n_offsets);
if (r < 0)
return r;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + l + 1;
return 1;
}
_public_ 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;
size_t *offsets = NULL;
size_t n_offsets = 0, item_size = 0;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(type != 0 || !contents, -EINVAL);
if (type == 0 || !contents) {
const char *cc;
char tt;
/* Allow entering into anonymous containers */
r = sd_bus_message_peek_type(m, &tt, &cc);
if (r < 0)
return r;
if (type != 0 && type != tt)
return -ENXIO;
if (contents && !streq(contents, cc))
return -ENXIO;
type = tt;
contents = cc;
}
/*
* 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;
if (!GREEDY_REALLOC(m->containers, m->containers_allocated, m->n_containers + 1))
return -ENOMEM;
if (message_end_of_signature(m))
return -ENXIO;
if (message_end_of_array(m, m->rindex))
return 0;
c = message_get_container(m);
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, &item_size, &offsets, &n_offsets);
else if (type == SD_BUS_TYPE_VARIANT)
r = bus_message_enter_variant(m, c, contents, &item_size);
else if (type == SD_BUS_TYPE_STRUCT)
r = bus_message_enter_struct(m, c, contents, &item_size, &offsets, &n_offsets);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_enter_dict_entry(m, c, contents, &item_size, &offsets, &n_offsets);
else
r = -EINVAL;
if (r <= 0) {
free(signature);
free(offsets);
return r;
}
/* OK, let's fill it in */
w = m->containers + m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->peeked_signature = NULL;
w->index = 0;
w->before = before;
w->begin = m->rindex;
w->end = m->rindex + c->item_size;
w->array_size = array_size;
w->item_size = item_size;
w->offsets = offsets;
w->n_offsets = n_offsets;
w->offset_index = 0;
return 1;
}
_public_ int sd_bus_message_exit_container(sd_bus_message *m) {
struct bus_container *c;
unsigned saved;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(m->n_containers > 0, -ENXIO);
c = message_get_container(m);
if (c->enclosing != SD_BUS_TYPE_ARRAY) {
if (c->signature && c->signature[c->index] != 0)
return -EBUSY;
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
if (m->rindex < c->end)
return -EBUSY;
} else 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;
}
free(c->signature);
free(c->peeked_signature);
free(c->offsets);
m->n_containers--;
c = message_get_container(m);
saved = c->index;
c->index = c->saved_index;
r = container_next_item(m, c, &m->rindex);
c->index = saved;
if (r < 0)
return r;
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);
free(c->offsets);
m->n_containers--;
/* Correct index of new top-level container */
c = message_get_container(m);
c->index = c->saved_index;
}
_public_ int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
struct bus_container *c;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
if (message_end_of_signature(m))
goto eof;
if (message_end_of_array(m, m->rindex))
goto eof;
c = message_get_container(m);
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(c->peeked_signature);
*contents = c->peeked_signature = 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(c->peeked_signature);
*contents = c->peeked_signature = 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) {
void *q;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
size_t k;
if (c->item_size < 2)
return -EBADMSG;
/* Look for the NUL delimiter that
separates the payload from the
signature. Since the body might be
in a different part that then the
signature we map byte by byte. */
for (k = 2; k <= c->item_size; k++) {
size_t where;
where = m->rindex + c->item_size - k;
r = message_peek_body(m, &where, 1, k, &q);
if (r < 0)
return r;
if (*(char*) q == 0)
break;
}
if (k > c->item_size)
return -EBADMSG;
free(c->peeked_signature);
c->peeked_signature = strndup((char*) q + 1, k - 1);
if (!c->peeked_signature)
return -ENOMEM;
if (!signature_is_valid(c->peeked_signature, true))
return -EBADMSG;
*contents = c->peeked_signature;
} else {
size_t rindex, l;
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 (!validate_signature(q, l))
return -EBADMSG;
*contents = q;
}
}
if (type)
*type = SD_BUS_TYPE_VARIANT;
return 1;
}
return -EINVAL;
eof:
if (type)
*type = 0;
if (contents)
*contents = NULL;
return 0;
}
_public_ int sd_bus_message_rewind(sd_bus_message *m, int complete) {
struct bus_container *c;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
if (complete) {
message_reset_containers(m);
m->rindex = 0;
c = message_get_container(m);
} else {
c = message_get_container(m);
c->offset_index = 0;
c->index = 0;
m->rindex = c->begin;
}
c->offset_index = 0;
c->item_size = (c->n_offsets > 0 ? c->offsets[0] : c->end) - 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;
unsigned n_loop = 0;
int r;
assert(m);
if (isempty(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; /* length of current array entries */
n_struct = strlen(types); /* length of current struct contents signature */
for (;;) {
const char *t;
n_loop++;
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) {
if (n_loop <= 1)
return 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) {
if (n_loop <= 1)
return 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) {
if (n_loop <= 1)
return 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) {
if (n_loop <= 1)
return 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;
}
_public_ int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(types, -EINVAL);
va_start(ap, types);
r = message_read_ap(m, types, ap);
va_end(ap);
return r;
}
_public_ int sd_bus_message_skip(sd_bus_message *m, const char *types) {
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
/* If types is NULL, read exactly one element */
if (!types) {
struct bus_container *c;
size_t l;
if (message_end_of_signature(m))
return -ENXIO;
if (message_end_of_array(m, m->rindex))
return 0;
c = message_get_container(m);
r = signature_element_length(c->signature + c->index, &l);
if (r < 0)
return r;
types = strndupa(c->signature + c->index, l);
}
switch (*types) {
case 0: /* Nothing to drop */
return 0;
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:
r = sd_bus_message_read_basic(m, *types, NULL);
if (r <= 0)
return r;
r = sd_bus_message_skip(m, types + 1);
if (r < 0)
return r;
return 1;
case SD_BUS_TYPE_ARRAY: {
size_t k;
r = signature_element_length(types + 1, &k);
if (r < 0)
return r;
{
char s[k+1];
memcpy(s, types+1, k);
s[k] = 0;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
if (r <= 0)
return r;
for (;;) {
r = sd_bus_message_skip(m, s);
if (r < 0)
return r;
if (r == 0)
break;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
}
r = sd_bus_message_skip(m, types + 1 + k);
if (r < 0)
return r;
return 1;
}
case SD_BUS_TYPE_VARIANT: {
const char *contents;
char x;
r = sd_bus_message_peek_type(m, &x, &contents);
if (r <= 0)
return r;
if (x != SD_BUS_TYPE_VARIANT)
return -ENXIO;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
if (r <= 0)
return r;
r = sd_bus_message_skip(m, contents);
if (r < 0)
return r;
assert(r != 0);
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
r = sd_bus_message_skip(m, types + 1);
if (r < 0)
return r;
return 1;
}
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
size_t k;
r = signature_element_length(types, &k);
if (r < 0)
return r;
{
char s[k-1];
memcpy(s, types+1, k-2);
s[k-2] = 0;
r = sd_bus_message_enter_container(m, *types == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
if (r <= 0)
return r;
r = sd_bus_message_skip(m, s);
if (r < 0)
return r;
assert(r != 0);
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
}
r = sd_bus_message_skip(m, types + k);
if (r < 0)
return r;
return 1;
}
default:
return -EINVAL;
}
}
_public_ 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;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(bus_type_is_trivial(type), -EINVAL);
assert_return(ptr, -EINVAL);
assert_return(size, -EINVAL);
assert_return(!BUS_MESSAGE_NEED_BSWAP(m), -ENOTSUP);
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);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
align = bus_gvariant_get_alignment(CHAR_TO_STR(type));
if (align < 0)
return align;
sz = c->end - c->begin;
} else {
align = bus_type_get_alignment(type);
if (align < 0)
return align;
sz = BUS_MESSAGE_BSWAP32(m, *c->array_size);
}
if (sz == 0)
/* Zero length array, let's return some aligned
* pointer that is not NULL */
p = (uint8_t*) NULL + align;
else {
r = message_peek_body(m, &m->rindex, align, sz, &p);
if (r < 0)
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,
size_t item_size,
uint32_t *ret) {
int r;
void *q;
assert(m);
assert(ri);
if (BUS_MESSAGE_IS_GVARIANT(m) && item_size != 4)
return -EBADMSG;
/* identical for gvariant and dbus1 */
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,
size_t item_size,
const char **ret) {
uint32_t l;
int r;
void *q;
assert(m);
assert(ri);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
if (item_size <= 0)
return -EBADMSG;
r = message_peek_fields(m, ri, 1, item_size, &q);
if (r < 0)
return r;
l = item_size - 1;
} else {
r = message_peek_field_uint32(m, ri, 4, &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,
size_t item_size,
const char **ret) {
size_t l;
int r;
void *q;
assert(m);
assert(ri);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
if (item_size <= 0)
return -EBADMSG;
r = message_peek_fields(m, ri, 1, item_size, &q);
if (r < 0)
return r;
l = item_size - 1;
} else {
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);
assert(!BUS_MESSAGE_IS_GVARIANT(m));
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, 0, 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, 0, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_SIGNATURE) {
r = message_peek_field_signature(m, ri, 0, 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, 0, &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, 0, &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;
bool unix_fds_set = false;
void *offsets = NULL;
unsigned n_offsets = 0;
size_t sz = 0;
unsigned i = 0;
assert(m);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
void *q;
sz = determine_word_size(BUS_MESSAGE_FIELDS_SIZE(m), 0);
if (sz > 0) {
size_t framing;
ri = BUS_MESSAGE_FIELDS_SIZE(m) - sz;
r = message_peek_fields(m, &ri, 1, sz, &q);
if (r < 0)
return r;
framing = read_word_le(q, sz);
if (framing >= BUS_MESSAGE_FIELDS_SIZE(m) - sz)
return -EBADMSG;
if ((BUS_MESSAGE_FIELDS_SIZE(m) - framing) % sz != 0)
return -EBADMSG;
ri = framing;
r = message_peek_fields(m, &ri, 1, BUS_MESSAGE_FIELDS_SIZE(m) - framing, &offsets);
if (r < 0)
return r;
n_offsets = (BUS_MESSAGE_FIELDS_SIZE(m) - framing) / sz;
}
}
ri = 0;
while (ri < BUS_MESSAGE_FIELDS_SIZE(m)) {
_cleanup_free_ char *sig = NULL;
const char *signature;
uint8_t *header;
size_t item_size = (size_t) -1;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
if (i >= n_offsets)
break;
if (i == 0)
ri = 0;
else
ri = ALIGN_TO(read_word_le((uint8_t*) offsets + (i-1)*sz, sz), 8);
}
r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
if (r < 0)
return r;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
size_t where, end;
char *b;
void *q;
end = read_word_le((uint8_t*) offsets + i*sz, sz);
if (end < ri)
return -EBADMSG;
where = ri = ALIGN_TO(ri, 8);
item_size = end - ri;
r = message_peek_fields(m, &where, 1, item_size, &q);
if (r < 0)
return r;
b = memrchr(q, 0, item_size);
if (!b)
return -EBADMSG;
sig = strndup(b+1, item_size - (b+1-(char*) q));
if (!sig)
return -ENOMEM;
signature = sig;
item_size = b - (char*) q;
} else {
r = message_peek_field_signature(m, &ri, 0, &signature);
if (r < 0)
return r;
}
switch (*header) {
case _BUS_MESSAGE_HEADER_INVALID:
return -EBADMSG;
case 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, item_size, &m->path);
break;
case 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, item_size, &m->interface);
break;
case 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, item_size, &m->member);
break;
case 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, item_size, &m->error.name);
if (r >= 0)
m->error._need_free = -1;
break;
case 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, item_size, &m->destination);
break;
case 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, item_size, &m->sender);
if (r >= 0 && m->sender[0] == ':' && m->bus->bus_client && !m->bus->is_kernel) {
m->creds.unique_name = (char*) m->sender;
m->creds.mask |= SD_BUS_CREDS_UNIQUE_NAME & m->bus->creds_mask;
}
break;
case 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, item_size, &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 BUS_MESSAGE_HEADER_REPLY_SERIAL: {
uint32_t serial;
if (m->reply_cookie != 0)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, item_size, &serial);
if (r < 0)
return r;
m->reply_cookie = serial;
if (m->reply_cookie == 0)
return -EBADMSG;
break;
}
case BUS_MESSAGE_HEADER_UNIX_FDS:
if (unix_fds_set)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, item_size, &unix_fds);
if (r < 0)
return -EBADMSG;
unix_fds_set = true;
break;
default:
if (!BUS_MESSAGE_IS_GVARIANT(m))
r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
}
if (r < 0)
return r;
i++;
}
if (m->n_fds != unix_fds)
return -EBADMSG;
switch (m->header->type) {
case SD_BUS_MESSAGE_SIGNAL:
if (!m->path || !m->interface || !m->member)
return -EBADMSG;
if (m->reply_cookie != 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_CALL:
if (!m->path || !m->member)
return -EBADMSG;
if (m->reply_cookie != 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_RETURN:
if (m->reply_cookie == 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_METHOD_ERROR:
if (m->reply_cookie == 0 || !m->error.name)
return -EBADMSG;
break;
}
/* Refuse non-local messages that claim they are local */
if (streq_ptr(m->path, "/org/freedesktop/DBus/Local"))
return -EBADMSG;
if (streq_ptr(m->interface, "org.freedesktop.DBus.Local"))
return -EBADMSG;
if (streq_ptr(m->sender, "org.freedesktop.DBus.Local"))
return -EBADMSG;
m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
r = build_struct_offsets(
m,
m->root_container.signature,
BUS_MESSAGE_BODY_SIZE(m),
&m->root_container.item_size,
&m->root_container.offsets,
&m->root_container.n_offsets);
if (r < 0)
return r;
}
/* 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;
}
_public_ int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
assert_return(m, -EINVAL);
assert_return(destination, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(!m->destination, -EEXIST);
return message_append_field_string(m, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
}
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 1;
}
_public_ int sd_bus_message_read_strv(sd_bus_message *m, char ***l) {
char **strv = NULL;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(l, -EINVAL);
r = bus_message_read_strv_extend(m, &strv);
if (r <= 0) {
strv_free(strv);
return r;
}
*l = strv;
return 1;
}
int bus_message_get_arg(sd_bus_message *m, unsigned i, const char **str, char ***strv) {
const char *contents;
unsigned j;
char type;
int r;
assert(m);
assert(str);
assert(strv);
r = sd_bus_message_rewind(m, true);
if (r < 0)
return r;
for (j = 0;; j++) {
r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
/* Don't match against arguments after the first one we don't understand */
if (!IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE) &&
!(type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")))
return -ENXIO;
if (j >= i)
break;
r = sd_bus_message_skip(m, NULL);
if (r < 0)
return r;
}
if (type == SD_BUS_TYPE_ARRAY) {
r = sd_bus_message_read_strv(m, strv);
if (r < 0)
return r;
*str = NULL;
} else {
r = sd_bus_message_read_basic(m, type, str);
if (r < 0)
return r;
*strv = NULL;
}
return 0;
}
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 == 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 == BUS_NATIVE_ENDIAN) {
fs = h->fields_size;
bs = h->body_size;
} else if (h->endian == 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;
}
_public_ 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);
}
_public_ const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
struct bus_container *c;
assert_return(m, NULL);
c = complete ? &m->root_container : message_get_container(m);
return strempty(c->signature);
}
_public_ int sd_bus_message_is_empty(sd_bus_message *m) {
assert_return(m, -EINVAL);
return isempty(m->root_container.signature);
}
_public_ int sd_bus_message_has_signature(sd_bus_message *m, const char *signature) {
assert_return(m, -EINVAL);
return streq(strempty(m->root_container.signature), strempty(signature));
}
_public_ int sd_bus_message_copy(sd_bus_message *m, sd_bus_message *source, int all) {
bool done_something = false;
int r;
assert_return(m, -EINVAL);
assert_return(source, -EINVAL);
assert_return(!m->sealed, -EPERM);
assert_return(source->sealed, -EPERM);
do {
const char *contents;
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(source, &type, &contents);
if (r < 0)
return r;
if (r == 0)
break;
done_something = true;
if (bus_type_is_container(type) > 0) {
r = sd_bus_message_enter_container(source, type, contents);
if (r < 0)
return r;
r = sd_bus_message_open_container(m, type, contents);
if (r < 0)
return r;
r = sd_bus_message_copy(m, source, true);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
r = sd_bus_message_exit_container(source);
if (r < 0)
return r;
continue;
}
r = sd_bus_message_read_basic(source, type, &basic);
if (r < 0)
return r;
assert(r > 0);
if (type == SD_BUS_TYPE_OBJECT_PATH ||
type == SD_BUS_TYPE_SIGNATURE ||
type == SD_BUS_TYPE_STRING)
r = sd_bus_message_append_basic(m, type, basic.string);
else
r = sd_bus_message_append_basic(m, type, &basic);
if (r < 0)
return r;
} while (all);
return done_something;
}
_public_ int sd_bus_message_verify_type(sd_bus_message *m, char type, const char *contents) {
const char *c;
char t;
int r;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(!type || bus_type_is_valid(type), -EINVAL);
assert_return(!contents || signature_is_valid(contents, true), -EINVAL);
assert_return(type || contents, -EINVAL);
assert_return(!contents || !type || bus_type_is_container(type), -EINVAL);
r = sd_bus_message_peek_type(m, &t, &c);
if (r <= 0)
return r;
if (type != 0 && type != t)
return 0;
if (contents && !streq_ptr(contents, c))
return 0;
return 1;
}
_public_ sd_bus *sd_bus_message_get_bus(sd_bus_message *m) {
assert_return(m, NULL);
return m->bus;
}
int bus_message_remarshal(sd_bus *bus, sd_bus_message **m) {
_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
usec_t timeout;
int r;
assert(bus);
assert(m);
assert(*m);
switch ((*m)->header->type) {
case SD_BUS_MESSAGE_SIGNAL:
r = sd_bus_message_new_signal(bus, &n, (*m)->path, (*m)->interface, (*m)->member);
if (r < 0)
return r;
break;
case SD_BUS_MESSAGE_METHOD_CALL:
r = sd_bus_message_new_method_call(bus, &n, (*m)->destination, (*m)->path, (*m)->interface, (*m)->member);
if (r < 0)
return r;
break;
case SD_BUS_MESSAGE_METHOD_RETURN:
case SD_BUS_MESSAGE_METHOD_ERROR:
n = message_new(bus, (*m)->header->type);
if (!n)
return -ENOMEM;
n->reply_cookie = (*m)->reply_cookie;
r = message_append_field_uint32(n, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) n->reply_cookie);
if (r < 0)
return r;
if ((*m)->header->type == SD_BUS_MESSAGE_METHOD_ERROR && (*m)->error.name) {
r = message_append_field_string(n, BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, (*m)->error.name, &n->error.message);
if (r < 0)
return r;
n->error._need_free = -1;
}
break;
default:
return -EINVAL;
}
if ((*m)->destination && !n->destination) {
r = message_append_field_string(n, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, (*m)->destination, &n->destination);
if (r < 0)
return r;
}
if ((*m)->sender && !n->sender) {
r = message_append_field_string(n, BUS_MESSAGE_HEADER_SENDER, SD_BUS_TYPE_STRING, (*m)->sender, &n->sender);
if (r < 0)
return r;
}
n->header->flags |= (*m)->header->flags & (BUS_MESSAGE_NO_REPLY_EXPECTED|BUS_MESSAGE_NO_AUTO_START);
r = sd_bus_message_copy(n, *m, true);
if (r < 0)
return r;
timeout = (*m)->timeout;
if (timeout == 0 && !((*m)->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED))
timeout = BUS_DEFAULT_TIMEOUT;
r = bus_message_seal(n, BUS_MESSAGE_COOKIE(*m), timeout);
if (r < 0)
return r;
sd_bus_message_unref(*m);
*m = n;
n = NULL;
return 0;
}
int bus_message_append_sender(sd_bus_message *m, const char *sender) {
assert(m);
assert(sender);
assert_return(!m->sealed, -EPERM);
assert_return(!m->sender, -EPERM);
return message_append_field_string(m, BUS_MESSAGE_HEADER_SENDER, SD_BUS_TYPE_STRING, sender, &m->sender);
}
_public_ int sd_bus_message_get_priority(sd_bus_message *m, int64_t *priority) {
assert_return(m, -EINVAL);
assert_return(priority, -EINVAL);
*priority = m->priority;
return 0;
}
_public_ int sd_bus_message_set_priority(sd_bus_message *m, int64_t priority) {
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
m->priority = priority;
return 0;
}