bus-message.c revision 392d5b378ceae5e1fd7c91ca545fcf4cd105744a
/*-*- 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 "util.h"
#include "utf8.h"
#include "strv.h"
#include "sd-bus.h"
#include "bus-message.h"
#include "bus-internal.h"
#include "bus-type.h"
#include "bus-signature.h"
static int message_parse_fields(sd_bus_message *m);
static int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored);
static void reset_containers(sd_bus_message *m) {
unsigned i;
assert(m);
for (i = 0; i < m->n_containers; i++)
free(m->containers[i].signature);
free(m->containers);
m->containers = NULL;
m->n_containers = 0;
m->root_container.index = 0;
}
static void message_free(sd_bus_message *m) {
assert(m);
if (m->free_header)
free(m->header);
if (m->free_fields)
free(m->fields);
if (m->free_body)
free(m->body);
if (m->free_fds) {
close_many(m->fds, m->n_fds);
free(m->fds);
}
reset_containers(m);
free(m->root_container.signature);
free(m->peeked_signature);
free(m);
}
static void* buffer_extend(void **p, uint32_t *sz, size_t align, size_t extend) {
size_t start, n;
void *k;
assert(p);
assert(sz);
assert(align > 0);
start = ALIGN_TO((size_t) *sz, align);
n = start + extend;
if (n == *sz)
return (uint8_t*) *p + start;
if (n > (size_t) ((uint32_t) -1))
return NULL;
k = realloc(*p, n);
if (!k)
return NULL;
/* Zero out padding */
if (start > *sz)
memset((uint8_t*) k + *sz, 0, start - *sz);
*p = k;
*sz = n;
return (uint8_t*) k + start;
}
static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz) {
void *p, *o;
assert(m);
o = m->fields;
p = buffer_extend(&m->fields, &m->header->fields_size, align, sz);
if (!p)
return NULL;
if (o != m->fields) {
/* Adjust quick access pointers */
if (m->path)
m->path = (const char*) m->fields + (m->path - (const char*) o);
if (m->interface)
m->interface = (const char*) m->fields + (m->interface - (const char*) o);
if (m->member)
m->member = (const char*) m->fields + (m->member - (const char*) o);
if (m->destination)
m->destination = (const char*) m->fields + (m->destination - (const char*) o);
if (m->sender)
m->sender = (const char*) m->fields + (m->sender - (const char*) o);
if (m->error.name)
m->error.name = (const char*) m->fields + (m->error.name - (const char*) o);
}
m->free_fields = true;
return p;
}
static int message_append_field_string(
sd_bus_message *m,
uint8_t h,
char type,
const char *s,
const char **ret) {
size_t l;
uint8_t *p;
assert(m);
l = strlen(s);
if (l > (size_t) (uint32_t) -1)
return -EINVAL;
/* field id byte + signature length + signature 's' + NUL + string length + string + NUL */
p = message_extend_fields(m, 8, 4 + 4 + l + 1);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = type;
p[3] = 0;
((uint32_t*) p)[1] = l;
memcpy(p + 8, s, l + 1);
if (ret)
*ret = (const char*) p + 8;
return 0;
}
static int message_append_field_signature(
sd_bus_message *m,
uint8_t h,
const char *s,
const char **ret) {
size_t l;
uint8_t *p;
assert(m);
l = strlen(s);
if (l > 255)
return -EINVAL;
/* field id byte + signature length + signature 'g' + NUL + string length + string + NUL */
p = message_extend_fields(m, 8, 4 + 1 + l + 1);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = SD_BUS_TYPE_SIGNATURE;
p[3] = 0;
p[4] = l;
memcpy(p + 5, s, l + 1);
if (ret)
*ret = (const char*) p + 5;
return 0;
}
static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x) {
uint8_t *p;
assert(m);
/* field id byte + signature length + signature 'u' + NUL + value */
p = message_extend_fields(m, 8, 4 + 4);
if (!p)
return -ENOMEM;
p[0] = h;
p[1] = 1;
p[2] = SD_BUS_TYPE_UINT32;
p[3] = 0;
((uint32_t*) p)[1] = x;
return 0;
}
int bus_message_from_malloc(
void *buffer,
size_t length,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
const char *label,
sd_bus_message **ret) {
sd_bus_message *m;
struct bus_header *h;
size_t total, fs, bs, label_sz, a;
int r;
assert(buffer || length <= 0);
assert(fds || n_fds <= 0);
assert(ret);
if (length < sizeof(struct bus_header))
return -EBADMSG;
h = buffer;
if (h->version != 1)
return -EBADMSG;
if (h->serial == 0)
return -EBADMSG;
if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
return -EBADMSG;
if (h->endian == SD_BUS_NATIVE_ENDIAN) {
fs = h->fields_size;
bs = h->body_size;
} else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
fs = bswap_32(h->fields_size);
bs = bswap_32(h->body_size);
} else
return -EBADMSG;
total = sizeof(struct bus_header) + ALIGN_TO(fs, 8) + bs;
if (length != total)
return -EBADMSG;
if (label) {
label_sz = strlen(label);
a = ALIGN(sizeof(sd_bus_message)) + label_sz + 1;
} else
a = sizeof(sd_bus_message);
m = malloc0(a);
if (!m)
return -ENOMEM;
m->n_ref = 1;
m->sealed = true;
m->header = h;
m->fields = (uint8_t*) buffer + sizeof(struct bus_header);
m->body = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN_TO(fs, 8);
m->fds = fds;
m->n_fds = n_fds;
if (ucred) {
m->uid = ucred->uid;
m->pid = ucred->pid;
m->gid = ucred->gid;
m->uid_valid = m->gid_valid = true;
}
if (label) {
m->label = (char*) m + ALIGN(sizeof(sd_bus_message));
memcpy(m->label, label, label_sz + 1);
}
m->n_iovec = 1;
m->iovec[0].iov_base = buffer;
m->iovec[0].iov_len = length;
r = message_parse_fields(m);
if (r < 0)
goto fail;
/* We take possession of the memory and fds now */
m->free_header = true;
m->free_fds = true;
*ret = m;
return 0;
fail:
message_free(m);
return r;
}
static sd_bus_message *message_new(sd_bus *bus, uint8_t type) {
sd_bus_message *m;
m = malloc0(ALIGN(sizeof(sd_bus_message)) + sizeof(struct bus_header));
if (!m)
return NULL;
m->n_ref = 1;
m->header = (struct bus_header*) ((uint8_t*) m + ALIGN(sizeof(struct sd_bus_message)));
m->header->endian = SD_BUS_NATIVE_ENDIAN;
m->header->type = type;
m->header->version = bus ? bus->message_version : 1;
m->allow_fds = !bus || bus->can_fds || (bus->state != BUS_HELLO && bus->state != BUS_RUNNING);
return m;
}
int sd_bus_message_new_signal(
sd_bus *bus,
const char *path,
const char *interface,
const char *member,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!path)
return -EINVAL;
if (!interface)
return -EINVAL;
if (!member)
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_TYPE_SIGNAL);
if (!t)
return -ENOMEM;
t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
if (r < 0)
goto fail;
*m = t;
return 0;
fail:
sd_bus_message_unref(t);
return r;
}
int sd_bus_message_new_method_call(
sd_bus *bus,
const char *destination,
const char *path,
const char *interface,
const char *member,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!path)
return -EINVAL;
if (!member)
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_TYPE_METHOD_CALL);
if (!t)
return -ENOMEM;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
if (r < 0)
goto fail;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
if (r < 0)
goto fail;
if (interface) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
if (r < 0)
goto fail;
}
if (destination) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &t->destination);
if (r < 0)
goto fail;
}
*m = t;
return 0;
fail:
message_free(t);
return r;
}
static int message_new_reply(
sd_bus *bus,
sd_bus_message *call,
uint8_t type,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!call)
return -EINVAL;
if (!call->sealed)
return -EPERM;
if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, type);
if (!t)
return -ENOMEM;
t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_serial = BUS_MESSAGE_SERIAL(call);
r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
if (r < 0)
goto fail;
if (call->sender) {
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->sender);
if (r < 0)
goto fail;
}
t->dont_send = !!(call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED);
*m = t;
return 0;
fail:
message_free(t);
return r;
}
int sd_bus_message_new_method_return(
sd_bus *bus,
sd_bus_message *call,
sd_bus_message **m) {
return message_new_reply(bus, call, SD_BUS_MESSAGE_TYPE_METHOD_RETURN, m);
}
int sd_bus_message_new_method_error(
sd_bus *bus,
sd_bus_message *call,
const sd_bus_error *e,
sd_bus_message **m) {
sd_bus_message *t;
int r;
if (!sd_bus_error_is_set(e))
return -EINVAL;
if (!m)
return -EINVAL;
r = message_new_reply(bus, call, SD_BUS_MESSAGE_TYPE_METHOD_ERROR, &t);
if (r < 0)
return r;
r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
if (r < 0)
goto fail;
if (e->message) {
r = message_append_basic(t, SD_BUS_TYPE_STRING, e->message, (const void**) &t->error.message);
if (r < 0)
goto fail;
}
*m = t;
return 0;
fail:
message_free(t);
return r;
}
sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
if (!m)
return NULL;
assert(m->n_ref > 0);
m->n_ref++;
return m;
}
sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
if (!m)
return NULL;
assert(m->n_ref > 0);
m->n_ref--;
if (m->n_ref <= 0)
message_free(m);
return NULL;
}
int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
if (!m)
return -EINVAL;
if (!type)
return -EINVAL;
*type = m->header->type;
return 0;
}
int sd_bus_message_get_serial(sd_bus_message *m, uint64_t *serial) {
if (!m)
return -EINVAL;
if (!serial)
return -EINVAL;
if (m->header->serial == 0)
return -ENOENT;
*serial = BUS_MESSAGE_SERIAL(m);
return 0;
}
int sd_bus_message_get_reply_serial(sd_bus_message *m, uint64_t *serial) {
if (!m)
return -EINVAL;
if (!serial)
return -EINVAL;
if (m->reply_serial == 0)
return -ENOENT;
*serial = m->reply_serial;
return 0;
}
int sd_bus_message_get_no_reply(sd_bus_message *m) {
if (!m)
return -EINVAL;
return m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
}
const char *sd_bus_message_get_path(sd_bus_message *m) {
if (!m)
return NULL;
return m->path;
}
const char *sd_bus_message_get_interface(sd_bus_message *m) {
if (!m)
return NULL;
return m->interface;
}
const char *sd_bus_message_get_member(sd_bus_message *m) {
if (!m)
return NULL;
return m->member;
}
const char *sd_bus_message_get_destination(sd_bus_message *m) {
if (!m)
return NULL;
return m->destination;
}
const char *sd_bus_message_get_sender(sd_bus_message *m) {
if (!m)
return NULL;
return m->sender;
}
const sd_bus_error *sd_bus_message_get_error(sd_bus_message *m) {
if (!m)
return NULL;
if (!sd_bus_error_is_set(&m->error))
return NULL;
return &m->error;
}
int sd_bus_message_get_uid(sd_bus_message *m, uid_t *uid) {
if (!m)
return -EINVAL;
if (!m->uid_valid)
return -ENOENT;
*uid = m->uid;
return 0;
}
int sd_bus_message_get_gid(sd_bus_message *m, gid_t *gid) {
if (!m)
return -EINVAL;
if (!m->gid_valid)
return -ENOENT;
*gid = m->gid;
return 0;
}
int sd_bus_message_get_pid(sd_bus_message *m, pid_t *pid) {
if (!m)
return -EINVAL;
if (m->pid <= 0)
return -ENOENT;
*pid = m->pid;
return 0;
}
int sd_bus_message_get_tid(sd_bus_message *m, pid_t *tid) {
if (!m)
return -EINVAL;
if (m->tid <= 0)
return -ENOENT;
*tid = m->tid;
return 0;
}
const char *sd_bus_message_get_label(sd_bus_message *m) {
if (!m)
return NULL;
return m->label;
}
int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_TYPE_SIGNAL)
return 0;
if (interface && (!m->interface || !streq(m->interface, interface)))
return 0;
if (member && (!m->member || !streq(m->member, member)))
return 0;
return 1;
}
int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
return 0;
if (interface && (!m->interface || !streq(m->interface, interface)))
return 0;
if (member && (!m->member || !streq(m->member, member)))
return 0;
return 1;
}
int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
return 0;
if (name && (!m->error.name || !streq(m->error.name, name)))
return 0;
return 1;
}
int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
return -EPERM;
if (b)
m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
else
m->header->flags &= ~SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
return 0;
}
static struct bus_container *message_get_container(sd_bus_message *m) {
assert(m);
if (m->n_containers == 0)
return &m->root_container;
assert(m->containers);
return m->containers + m->n_containers - 1;
}
static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz) {
void *p, *o;
size_t added;
struct bus_container *c;
assert(m);
assert(align > 0);
o = m->body;
added = m->header->body_size;
p = buffer_extend(&m->body, &m->header->body_size, align, sz);
if (!p)
return NULL;
added = m->header->body_size - added;
for (c = m->containers; c < m->containers + m->n_containers; c++)
if (c->array_size) {
c->array_size = (uint32_t*) ((uint8_t*) m->body + ((uint8_t*) c->array_size - (uint8_t*) o));
*c->array_size += added;
}
if (o != m->body) {
if (m->error.message)
m->error.message = (const char*) m->body + (m->error.message - (const char*) o);
}
m->free_body = true;
return p;
}
int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored) {
struct bus_container *c;
size_t sz, align;
uint32_t k;
void *a;
char *e = NULL;
int fd = -1;
uint32_t fdi = 0;
int r;
if (!m)
return -EINVAL;
if (!p)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!bus_type_is_basic(type))
return -EINVAL;
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 {
/* 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)
return -ENOMEM;
}
switch (type) {
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
align = 4;
sz = 4 + strlen(p) + 1;
break;
case SD_BUS_TYPE_SIGNATURE:
align = 1;
sz = 1 + strlen(p) + 1;
break;
case SD_BUS_TYPE_BOOLEAN:
align = sz = 4;
assert_cc(sizeof(int) == sizeof(uint32_t));
memcpy(&k, p, 4);
k = !!k;
p = &k;
break;
case SD_BUS_TYPE_UNIX_FD: {
int z, *f;
if (!m->allow_fds) {
r = -ENOTSUP;
goto fail;
}
align = sz = 4;
z = *(int*) p;
if (z < 0) {
r = -EINVAL;
goto fail;
}
fd = fcntl(z, F_DUPFD_CLOEXEC, 3);
if (fd < 0) {
r = -errno;
goto fail;
}
f = realloc(m->fds, sizeof(int) * (m->n_fds + 1));
if (!f) {
r = -ENOMEM;
goto fail;
}
fdi = m->n_fds;
f[fdi] = fd;
m->fds = f;
m->free_fds = true;
break;
}
default:
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
break;
}
assert(align > 0);
assert(sz > 0);
a = message_extend_body(m, align, sz);
if (!a) {
r = -ENOMEM;
goto fail;
}
if (type == SD_BUS_TYPE_STRING || type == SD_BUS_TYPE_OBJECT_PATH) {
*(uint32_t*) a = sz - 5;
memcpy((uint8_t*) a + 4, p, sz - 4);
if (stored)
*stored = (const uint8_t*) a + 4;
} else if (type == SD_BUS_TYPE_SIGNATURE) {
*(uint8_t*) a = sz - 1;
memcpy((uint8_t*) a + 1, p, sz - 1);
if (stored)
*stored = (const uint8_t*) a + 1;
} else if (type == SD_BUS_TYPE_UNIX_FD) {
*(uint32_t*) a = fdi;
if (stored)
*stored = a;
m->n_fds ++;
} else {
memcpy(a, p, sz);
if (stored)
*stored = a;
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
fail:
/* Truncate extended signature again */
if (e)
c->signature[c->index] = 0;
if (fd >= 0)
close_nointr_nofail(fd);
return r;
}
int sd_bus_message_append_basic(sd_bus_message *m, char type, const void *p) {
return message_append_basic(m, type, p, NULL);
}
static int bus_message_open_array(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
uint32_t **array_size) {
unsigned nindex;
char *e = NULL;
void *a, *b;
int alignment;
size_t saved;
assert(m);
assert(c);
assert(contents);
assert(array_size);
if (!signature_is_single(contents))
return -EINVAL;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
if (c->signature && c->signature[c->index]) {
/* Verify the existing signature */
if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!startswith(c->signature + c->index + 1, contents))
return -ENXIO;
nindex = c->index + 1 + strlen(contents);
} else {
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)
return -ENOMEM;
nindex = e - c->signature;
}
saved = m->header->body_size;
a = message_extend_body(m, 4, 4);
if (!a) {
/* Truncate extended signature again */
if (e)
c->signature[c->index] = 0;
return -ENOMEM;
}
b = m->body;
if (!message_extend_body(m, alignment, 0)) {
/* Add alignment between size and first element */
if (e)
c->signature[c->index] = 0;
m->header->body_size = saved;
return -ENOMEM;
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
/* m->body might have changed so let's readjust a */
a = (uint8_t*) m->body + ((uint8_t*) a - (uint8_t*) b);
*(uint32_t*) a = 0;
*array_size = a;
return 0;
}
static int bus_message_open_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
char *e = NULL;
size_t l;
void *a;
assert(m);
assert(c);
assert(contents);
if (!signature_is_single(contents))
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 {
if (c->enclosing != 0)
return -ENXIO;
e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_VARIANT), NULL);
if (!e)
return -ENOMEM;
}
l = strlen(contents);
a = message_extend_body(m, 1, 1 + l + 1);
if (!a) {
/* Truncate extended signature again */
if (e)
c->signature[c->index] = 0;
return -ENOMEM;
}
*(uint8_t*) a = l;
memcpy((uint8_t*) a + 1, contents, l + 1);
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 0;
}
static int bus_message_open_struct(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t nindex;
char *e = NULL;
assert(m);
assert(c);
assert(contents);
if (!signature_is_valid(contents, false))
return -EINVAL;
if (c->signature && c->signature[c->index]) {
size_t l;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
return -ENXIO;
nindex = c->index + 1 + l + 1;
} else {
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)
return -ENOMEM;
nindex = e - c->signature;
}
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0)) {
if (e)
c->signature[c->index] = 0;
return -ENOMEM;
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
return 0;
}
static int bus_message_open_dict_entry(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t nindex;
assert(m);
assert(c);
assert(contents);
if (!signature_is_pair(contents))
return -EINVAL;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (c->signature && c->signature[c->index]) {
size_t l;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
return -ENXIO;
nindex = c->index + 1 + l + 1;
} else
return -ENXIO;
/* Align contents to 8 byte boundary */
if (!message_extend_body(m, 8, 0))
return -ENOMEM;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index = nindex;
return 0;
}
int sd_bus_message_open_container(
sd_bus_message *m,
char type,
const char *contents) {
struct bus_container *c, *w;
uint32_t *array_size = NULL;
char *signature;
int r;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!contents)
return -EINVAL;
/* Make sure we have space for one more container */
w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
if (!w)
return -ENOMEM;
m->containers = w;
c = message_get_container(m);
signature = strdup(contents);
if (!signature)
return -ENOMEM;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_open_array(m, c, contents, &array_size);
else if (type == SD_BUS_TYPE_VARIANT)
r = bus_message_open_variant(m, c, contents);
else if (type == SD_BUS_TYPE_STRUCT)
r = bus_message_open_struct(m, c, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_open_dict_entry(m, c, contents);
else
r = -EINVAL;
if (r < 0) {
free(signature);
return r;
}
/* OK, let's fill it in */
w += m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->index = 0;
w->array_size = array_size;
w->begin = 0;
return 0;
}
int sd_bus_message_close_container(sd_bus_message *m) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->n_containers <= 0)
return -EINVAL;
c = message_get_container(m);
if (c->enclosing != SD_BUS_TYPE_ARRAY)
if (c->signature && c->signature[c->index] != 0)
return -EINVAL;
free(c->signature);
m->n_containers--;
return 0;
}
static int message_append_ap(
sd_bus_message *m,
const char *types,
va_list ap) {
const char *t;
int r;
assert(m);
assert(types);
for (t = types; *t; t++) {
switch (*t) {
case SD_BUS_TYPE_BYTE: {
uint8_t x;
x = (uint8_t) va_arg(ap, int);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_UNIX_FD: {
uint32_t x;
/* We assume a boolean is the same as int32_t */
assert_cc(sizeof(int32_t) == sizeof(int));
x = va_arg(ap, uint32_t);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16: {
uint16_t x;
x = (uint16_t) va_arg(ap, int);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE: {
uint64_t x;
x = va_arg(ap, uint64_t);
r = sd_bus_message_append_basic(m, *t, &x);
break;
}
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE: {
const char *x;
x = va_arg(ap, const char*);
r = sd_bus_message_append_basic(m, *t, x);
break;
}
case SD_BUS_TYPE_ARRAY: {
size_t k;
r = signature_element_length(t + 1, &k);
if (r < 0)
return r;
{
unsigned i, n;
char s[k + 1];
memcpy(s, t + 1, k);
s[k] = 0;
t += k;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, s);
if (r < 0)
return r;
n = va_arg(ap, unsigned);
for (i = 0; i < n; i++) {
r = message_append_ap(m, s, ap);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(m);
}
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 = message_append_ap(m, s, ap);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
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;
t += k - 1;
r = message_append_ap(m, s, ap);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
}
break;
}
default:
r = -EINVAL;
}
if (r < 0)
return r;
}
return 0;
}
int sd_bus_message_append(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
if (!m)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (!types)
return -EINVAL;
va_start(ap, types);
r = message_append_ap(m, types, ap);
va_end(ap);
return r;
}
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, n;
assert(rindex);
assert(align > 0);
start = ALIGN_TO((size_t) *rindex, align);
n = start + nbytes;
if (n > 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 = n;
return 1;
}
static bool message_end_of_array(sd_bus_message *m, size_t index) {
struct bus_container *c;
assert(m);
c = message_get_container(m);
if (!c->array_size)
return false;
return index >= c->begin + BUS_MESSAGE_BSWAP32(m, *c->array_size);
}
static int message_peek_body(sd_bus_message *m, size_t *rindex, size_t align, size_t nbytes, void **ret) {
assert(m);
assert(rindex);
assert(align > 0);
if (message_end_of_array(m, *rindex))
return 0;
return buffer_peek(m->body, BUS_MESSAGE_BODY_SIZE(m), rindex, align, nbytes, ret);
}
static bool validate_nul(const char *s, size_t l) {
/* Check for NUL chars in the string */
if (memchr(s, 0, l))
return false;
/* Check for NUL termination */
if (s[l] != 0)
return false;
return true;
}
static bool validate_string(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
/* Check if valid UTF8 */
if (!utf8_is_valid(s))
return false;
return true;
}
static bool validate_signature(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
/* Check if valid signature */
if (!signature_is_valid(s, true))
return false;
return true;
}
static bool validate_object_path(const char *s, size_t l) {
if (!validate_nul(s, l))
return false;
if (!object_path_is_valid(s))
return false;
return true;
}
int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
struct bus_container *c;
int r;
void *q;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!bus_type_is_basic(type))
return -EINVAL;
if (!p)
return -EINVAL;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (c->signature[c->index] != type)
return -ENXIO;
switch (type) {
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH: {
uint32_t l;
size_t rindex;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 4, 4, &q);
if (r <= 0)
return r;
l = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (type == SD_BUS_TYPE_OBJECT_PATH) {
if (!validate_object_path(q, l))
return -EBADMSG;
} else {
if (!validate_string(q, l))
return -EBADMSG;
}
m->rindex = rindex;
*(const char**) p = q;
break;
}
case SD_BUS_TYPE_SIGNATURE: {
uint8_t l;
size_t rindex;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r <= 0)
return r;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
m->rindex = rindex;
*(const char**) p = q;
break;
}
default: {
size_t sz, align, rindex;
align = bus_type_get_alignment(type);
sz = bus_type_get_size(type);
rindex = m->rindex;
r = message_peek_body(m, &rindex, align, sz, &q);
if (r <= 0)
return r;
switch (type) {
case SD_BUS_TYPE_BYTE:
*(uint8_t*) p = *(uint8_t*) q;
break;
case SD_BUS_TYPE_BOOLEAN:
*(int*) p = !!*(uint32_t*) q;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
*(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
*(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
break;
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
*(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
break;
case SD_BUS_TYPE_UNIX_FD: {
int copy;
uint32_t j;
j = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
if (j >= m->n_fds)
return -EBADMSG;
copy = fcntl(m->fds[j], F_DUPFD_CLOEXEC, 3);
if (copy < 0)
return -errno;
*(int*) p = copy;
break;
}
default:
assert_not_reached("Unknown basic type...");
}
m->rindex = rindex;
break;
}
}
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
return 1;
}
static int bus_message_enter_array(
sd_bus_message *m,
struct bus_container *c,
const char *contents,
uint32_t **array_size) {
size_t rindex;
void *q;
int r, alignment;
assert(m);
assert(c);
assert(contents);
assert(array_size);
if (!signature_is_single(contents))
return -EINVAL;
alignment = bus_type_get_alignment(contents[0]);
if (alignment < 0)
return alignment;
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!startswith(c->signature + c->index + 1, contents))
return -ENXIO;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 4, 4, &q);
if (r <= 0)
return r;
if (BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q) > BUS_ARRAY_MAX_SIZE)
return -EBADMSG;
r = message_peek_body(m, &rindex, alignment, 0, NULL);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + strlen(contents);
m->rindex = rindex;
*array_size = (uint32_t*) q;
return 1;
}
static int bus_message_enter_variant(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t rindex;
uint8_t l;
void *q;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_single(contents))
return -EINVAL;
if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return 0;
if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
return -ENXIO;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r <= 0)
return r;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
if (!streq(q, contents))
return -ENXIO;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index++;
m->rindex = rindex;
return 1;
}
static int bus_message_enter_struct(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t l;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_valid(contents, false))
return -EINVAL;
if (!c->signature || c->signature[c->index] == 0)
return 0;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
return -ENXIO;
r = message_peek_body(m, &m->rindex, 8, 0, NULL);
if (r <= 0)
return r;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + l + 1;
return 1;
}
static int bus_message_enter_dict_entry(
sd_bus_message *m,
struct bus_container *c,
const char *contents) {
size_t l;
int r;
assert(m);
assert(c);
assert(contents);
if (!signature_is_pair(contents))
return -EINVAL;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
return -ENXIO;
if (!c->signature || c->signature[c->index] == 0)
return 0;
l = strlen(contents);
if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
!startswith(c->signature + c->index + 1, contents) ||
c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
return -ENXIO;
r = message_peek_body(m, &m->rindex, 8, 0, NULL);
if (r <= 0)
return r;
if (c->enclosing != SD_BUS_TYPE_ARRAY)
c->index += 1 + l + 1;
return 1;
}
int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *contents) {
struct bus_container *c, *w;
uint32_t *array_size = NULL;
char *signature;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!contents)
return -EINVAL;
/*
* We enforce a global limit on container depth, that is much
* higher than the 32 structs and 32 arrays the specification
* mandates. This is simpler to implement for us, and we need
* this only to ensure our container array doesn't grow
* without bounds. We are happy to return any data from a
* message as long as the data itself is valid, even if the
* overall message might be not.
*
* Note that the message signature is validated when
* parsing the headers, and that validation does check the
* 32/32 limit.
*
* Note that the specification defines no limits on the depth
* of stacked variants, but we do.
*/
if (m->n_containers >= BUS_CONTAINER_DEPTH)
return -EBADMSG;
w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
if (!w)
return -ENOMEM;
m->containers = w;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
return 0;
signature = strdup(contents);
if (!signature)
return -ENOMEM;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_enter_array(m, c, contents, &array_size);
else if (type == SD_BUS_TYPE_VARIANT)
r = bus_message_enter_variant(m, c, contents);
else if (type == SD_BUS_TYPE_STRUCT)
r = bus_message_enter_struct(m, c, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
r = bus_message_enter_dict_entry(m, c, contents);
else
r = -EINVAL;
if (r <= 0) {
free(signature);
return r;
}
/* OK, let's fill it in */
w += m->n_containers++;
w->enclosing = type;
w->signature = signature;
w->index = 0;
w->array_size = array_size;
w->begin = m->rindex;
return 1;
}
int sd_bus_message_exit_container(sd_bus_message *m) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (m->n_containers <= 0)
return -EINVAL;
c = message_get_container(m);
if (c->enclosing == SD_BUS_TYPE_ARRAY) {
uint32_t l;
l = BUS_MESSAGE_BSWAP32(m, *c->array_size);
if (c->begin + l != m->rindex)
return -EBUSY;
} else {
if (c->signature && c->signature[c->index] != 0)
return -EINVAL;
}
free(c->signature);
m->n_containers--;
return 1;
}
int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
struct bus_container *c;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
c = message_get_container(m);
if (!c->signature || c->signature[c->index] == 0)
goto eof;
if (message_end_of_array(m, m->rindex))
goto eof;
if (bus_type_is_basic(c->signature[c->index])) {
if (contents)
*contents = NULL;
if (type)
*type = c->signature[c->index];
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_ARRAY) {
if (contents) {
size_t l;
char *sig;
r = signature_element_length(c->signature+c->index+1, &l);
if (r < 0)
return r;
assert(l >= 1);
sig = strndup(c->signature + c->index + 1, l);
if (!sig)
return -ENOMEM;
free(m->peeked_signature);
m->peeked_signature = sig;
*contents = sig;
}
if (type)
*type = SD_BUS_TYPE_ARRAY;
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ||
c->signature[c->index] == SD_BUS_TYPE_DICT_ENTRY_BEGIN) {
if (contents) {
size_t l;
char *sig;
r = signature_element_length(c->signature+c->index, &l);
if (r < 0)
return r;
assert(l >= 2);
sig = strndup(c->signature + c->index + 1, l - 2);
if (!sig)
return -ENOMEM;
free(m->peeked_signature);
m->peeked_signature = sig;
*contents = sig;
}
if (type)
*type = c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
return 1;
}
if (c->signature[c->index] == SD_BUS_TYPE_VARIANT) {
if (contents) {
size_t rindex, l;
void *q;
rindex = m->rindex;
r = message_peek_body(m, &rindex, 1, 1, &q);
if (r < 0)
return r;
if (r == 0)
goto eof;
l = *(uint8_t*) q;
r = message_peek_body(m, &rindex, 1, l+1, &q);
if (r < 0)
return r;
if (r == 0)
return -EBADMSG;
if (!validate_signature(q, l))
return -EBADMSG;
*contents = q;
}
if (type)
*type = SD_BUS_TYPE_VARIANT;
return 1;
}
return -EINVAL;
eof:
if (type)
*type = c->enclosing;
if (contents)
*contents = NULL;
return 0;
}
int sd_bus_message_rewind(sd_bus_message *m, int complete) {
struct bus_container *c;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (complete) {
reset_containers(m);
m->rindex = 0;
m->root_container.index = 0;
c = message_get_container(m);
} else {
c = message_get_container(m);
c->index = 0;
m->rindex = c->begin;
}
return !isempty(c->signature);
}
static int message_read_ap(sd_bus_message *m, const char *types, va_list ap) {
const char *t;
int r;
assert(m);
assert(types);
for (t = types; *t; t++) {
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);
break;
}
case SD_BUS_TYPE_ARRAY: {
size_t k;
r = signature_element_length(t + 1, &k);
if (r < 0)
return r;
{
unsigned i, n;
char s[k + 1];
memcpy(s, t + 1, k);
s[k] = 0;
t += k;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
n = va_arg(ap, unsigned);
for (i = 0; i < n; i++) {
r = message_read_ap(m, s, ap);
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
}
break;
}
case SD_BUS_TYPE_VARIANT: {
const char *s;
s = va_arg(ap, const char *);
if (!s)
return -EINVAL;
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
r = message_read_ap(m, s, ap);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
r = sd_bus_message_exit_container(m);
break;
}
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
size_t k;
r = signature_element_length(t, &k);
if (r < 0)
return r;
{
char s[k - 1];
memcpy(s, t + 1, k - 2);
s[k - 2] = 0;
r = sd_bus_message_enter_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
t += k - 1;
r = message_read_ap(m, s, ap);
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
r = sd_bus_message_exit_container(m);
}
break;
}
default:
r = -EINVAL;
}
if (r < 0)
return r;
if (r == 0)
return -ENXIO;
}
return 1;
}
int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
va_list ap;
int r;
if (!m)
return -EINVAL;
if (!m->sealed)
return -EPERM;
if (!types)
return -EINVAL;
va_start(ap, types);
r = message_read_ap(m, types, ap);
va_end(ap);
return r;
}
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(m->fields, BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
}
static int message_peek_field_uint32(
sd_bus_message *m,
size_t *ri,
uint32_t *ret) {
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_fields(m, ri, 4, 4, &q);
if (r < 0)
return r;
if (ret)
*ret = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
return 0;
}
static int message_peek_field_string(
sd_bus_message *m,
bool (*validate)(const char *p),
size_t *ri,
const char **ret) {
uint32_t l;
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_field_uint32(m, ri, &l);
if (r < 0)
return r;
r = message_peek_fields(m, ri, 1, l+1, &q);
if (r < 0)
return r;
if (validate) {
if (!validate_nul(q, l))
return -EBADMSG;
if (!validate(q))
return -EBADMSG;
} else {
if (!validate_string(q, l))
return -EBADMSG;
}
if (ret)
*ret = q;
return 0;
}
static int message_peek_field_signature(
sd_bus_message *m,
size_t *ri,
const char **ret) {
size_t l;
int r;
void *q;
assert(m);
assert(ri);
r = message_peek_fields(m, ri, 1, 1, &q);
if (r < 0)
return r;
l = *(uint8_t*) q;
r = message_peek_fields(m, ri, 1, l+1, &q);
if (r < 0)
return r;
if (!validate_signature(q, l))
return -EBADMSG;
if (ret)
*ret = q;
return 0;
}
static int message_skip_fields(
sd_bus_message *m,
size_t *ri,
uint32_t array_size,
const char **signature) {
size_t original_index;
int r;
assert(m);
assert(ri);
assert(signature);
original_index = *ri;
for (;;) {
char t;
size_t l;
if (array_size != (uint32_t) -1 &&
array_size <= *ri - original_index)
return 0;
t = **signature;
if (!t)
return 0;
if (t == SD_BUS_TYPE_STRING) {
r = message_peek_field_string(m, NULL, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_OBJECT_PATH) {
r = message_peek_field_string(m, object_path_is_valid, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_SIGNATURE) {
r = message_peek_field_signature(m, ri, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (bus_type_is_basic(t)) {
size_t align, k;
align = bus_type_get_alignment(t);
k = bus_type_get_size(t);
r = message_peek_fields(m, ri, align, k, NULL);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_ARRAY) {
r = signature_element_length(*signature+1, &l);
if (r < 0)
return r;
assert(l >= 1);
{
char sig[l-1], *s;
uint32_t nas;
int alignment;
strncpy(sig, *signature + 1, l-1);
s = sig;
alignment = bus_type_get_alignment(sig[0]);
if (alignment < 0)
return alignment;
r = message_peek_field_uint32(m, ri, &nas);
if (r < 0)
return r;
if (nas > BUS_ARRAY_MAX_SIZE)
return -EBADMSG;
r = message_peek_fields(m, ri, alignment, 0, NULL);
if (r < 0)
return r;
r = message_skip_fields(m, ri, nas, (const char**) &s);
if (r < 0)
return r;
}
(*signature) += 1 + l;
} else if (t == SD_BUS_TYPE_VARIANT) {
const char *s;
r = message_peek_field_signature(m, ri, &s);
if (r < 0)
return r;
r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
if (r < 0)
return r;
(*signature)++;
} else if (t == SD_BUS_TYPE_STRUCT ||
t == SD_BUS_TYPE_DICT_ENTRY) {
r = signature_element_length(*signature, &l);
if (r < 0)
return r;
assert(l >= 2);
{
char sig[l-1], *s;
strncpy(sig, *signature + 1, l-1);
s = sig;
r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
if (r < 0)
return r;
}
*signature += l;
} else
return -EINVAL;
}
}
static int message_parse_fields(sd_bus_message *m) {
size_t ri;
int r;
uint32_t unix_fds = 0;
assert(m);
for (ri = 0; ri < BUS_MESSAGE_FIELDS_SIZE(m); ) {
const char *signature;
uint8_t *header;
r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
if (r < 0)
return r;
r = message_peek_field_signature(m, &ri, &signature);
if (r < 0)
return r;
switch (*header) {
case _SD_BUS_MESSAGE_HEADER_INVALID:
return -EBADMSG;
case SD_BUS_MESSAGE_HEADER_PATH:
if (m->path)
return -EBADMSG;
if (!streq(signature, "o"))
return -EBADMSG;
r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
break;
case SD_BUS_MESSAGE_HEADER_INTERFACE:
if (m->interface)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
break;
case SD_BUS_MESSAGE_HEADER_MEMBER:
if (m->member)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
break;
case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
if (m->error.name)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, error_name_is_valid, &ri, &m->error.name);
break;
case SD_BUS_MESSAGE_HEADER_DESTINATION:
if (m->destination)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
break;
case SD_BUS_MESSAGE_HEADER_SENDER:
if (m->sender)
return -EBADMSG;
if (!streq(signature, "s"))
return -EBADMSG;
r = message_peek_field_string(m, service_name_is_valid, &ri, &m->sender);
break;
case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
const char *s;
char *c;
if (m->root_container.signature)
return -EBADMSG;
if (!streq(signature, "g"))
return -EBADMSG;
r = message_peek_field_signature(m, &ri, &s);
if (r < 0)
return r;
c = strdup(s);
if (!c)
return -ENOMEM;
free(m->root_container.signature);
m->root_container.signature = c;
break;
}
case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
if (m->reply_serial != 0)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, &m->reply_serial);
if (r < 0)
return r;
if (m->reply_serial == 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
if (unix_fds != 0)
return -EBADMSG;
if (!streq(signature, "u"))
return -EBADMSG;
r = message_peek_field_uint32(m, &ri, &unix_fds);
if (r < 0)
return -EBADMSG;
if (unix_fds == 0)
return -EBADMSG;
break;
default:
r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
}
if (r < 0)
return r;
}
if (m->n_fds != unix_fds)
return -EBADMSG;
if (isempty(m->root_container.signature) != (BUS_MESSAGE_BODY_SIZE(m) == 0))
return -EBADMSG;
switch (m->header->type) {
case SD_BUS_MESSAGE_TYPE_SIGNAL:
if (!m->path || !m->interface || !m->member)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_TYPE_METHOD_CALL:
if (!m->path || !m->member)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_TYPE_METHOD_RETURN:
if (m->reply_serial == 0)
return -EBADMSG;
break;
case SD_BUS_MESSAGE_TYPE_METHOD_ERROR:
if (m->reply_serial == 0 || !m->error.name)
return -EBADMSG;
break;
}
/* Try to read the error message, but if we can't it's a non-issue */
if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
sd_bus_message_read(m, "s", &m->error.message);
return 0;
}
static void setup_iovec(sd_bus_message *m) {
assert(m);
assert(m->sealed);
m->n_iovec = 0;
m->size = 0;
m->iovec[m->n_iovec].iov_base = m->header;
m->iovec[m->n_iovec].iov_len = sizeof(*m->header);
m->size += m->iovec[m->n_iovec].iov_len;
m->n_iovec++;
if (m->fields) {
m->iovec[m->n_iovec].iov_base = m->fields;
m->iovec[m->n_iovec].iov_len = m->header->fields_size;
m->size += m->iovec[m->n_iovec].iov_len;
m->n_iovec++;
if (m->header->fields_size % 8 != 0) {
static const uint8_t padding[7] = { 0, 0, 0, 0, 0, 0, 0 };
m->iovec[m->n_iovec].iov_base = (void*) padding;
m->iovec[m->n_iovec].iov_len = 8 - m->header->fields_size % 8;
m->size += m->iovec[m->n_iovec].iov_len;
m->n_iovec++;
}
}
if (m->body) {
m->iovec[m->n_iovec].iov_base = m->body;
m->iovec[m->n_iovec].iov_len = m->header->body_size;
m->size += m->iovec[m->n_iovec].iov_len;
m->n_iovec++;
}
}
int bus_message_seal(sd_bus_message *m, uint64_t serial) {
int r;
assert(m);
if (m->sealed)
return -EPERM;
if (m->n_containers > 0)
return -EBADMSG;
/* If there's a non-trivial signature set, then add it in here */
if (!isempty(m->root_container.signature)) {
r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
if (r < 0)
return r;
}
if (m->n_fds > 0) {
r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
if (r < 0)
return r;
}
m->header->serial = serial;
m->sealed = true;
setup_iovec(m);
return 0;
}
int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
if (!m)
return -EINVAL;
if (!destination)
return -EINVAL;
if (m->sealed)
return -EPERM;
if (m->destination)
return -EEXIST;
return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
}
int bus_message_dump(sd_bus_message *m) {
unsigned level = 1;
int r;
assert(m);
printf("Message %p\n"
"\tn_ref=%u\n"
"\tendian=%c\n"
"\ttype=%i\n"
"\tflags=%u\n"
"\tversion=%u\n"
"\tserial=%u\n"
"\tfields_size=%u\n"
"\tbody_size=%u\n"
"\tpath=%s\n"
"\tinterface=%s\n"
"\tmember=%s\n"
"\tdestination=%s\n"
"\tsender=%s\n"
"\tsignature=%s\n"
"\treply_serial=%u\n"
"\terror.name=%s\n"
"\terror.message=%s\n"
"\tsealed=%s\n",
m,
m->n_ref,
m->header->endian,
m->header->type,
m->header->flags,
m->header->version,
BUS_MESSAGE_SERIAL(m),
BUS_MESSAGE_FIELDS_SIZE(m),
BUS_MESSAGE_BODY_SIZE(m),
strna(m->path),
strna(m->interface),
strna(m->member),
strna(m->destination),
strna(m->sender),
strna(m->root_container.signature),
m->reply_serial,
strna(m->error.name),
strna(m->error.message),
yes_no(m->sealed));
r = sd_bus_message_rewind(m, true);
if (r < 0) {
log_error("Failed to rewind: %s", strerror(-r));
return r;
}
printf("BEGIN_MESSAGE \"%s\" {\n", strempty(m->root_container.signature));
for(;;) {
_cleanup_free_ char *prefix = NULL;
const char *contents = NULL;
char type;
union {
uint8_t u8;
uint16_t u16;
int16_t s16;
uint32_t u32;
int32_t s32;
uint64_t u64;
int64_t s64;
double d64;
const char *string;
int i;
} basic;
r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0) {
log_error("Failed to peek type: %s", strerror(-r));
return r;
}
if (r == 0) {
if (level <= 1)
break;
r = sd_bus_message_exit_container(m);
if (r < 0) {
log_error("Failed to exit container: %s", strerror(-r));
return r;
}
level--;
prefix = strrep("\t", level);
if (!prefix)
return log_oom();
if (type == SD_BUS_TYPE_ARRAY)
printf("%s} END_ARRAY \n", prefix);
else if (type == SD_BUS_TYPE_VARIANT)
printf("%s} END_VARIANT\n", prefix);
else if (type == SD_BUS_TYPE_STRUCT)
printf("%s} END_STRUCT\n", prefix);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
printf("%s} END_DICT_ENTRY\n", prefix);
continue;
}
prefix = strrep("\t", level);
if (!prefix)
return log_oom();
if (bus_type_is_container(type) > 0) {
r = sd_bus_message_enter_container(m, type, contents);
if (r < 0) {
log_error("Failed to enter container: %s", strerror(-r));
return r;
}
if (type == SD_BUS_TYPE_ARRAY)
printf("%sBEGIN_ARRAY \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_VARIANT)
printf("%sBEGIN_VARIANT \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_STRUCT)
printf("%sBEGIN_STRUCT \"%s\" {\n", prefix, contents);
else if (type == SD_BUS_TYPE_DICT_ENTRY)
printf("%sBEGIN_DICT_ENTRY \"%s\" {\n", prefix, contents);
level ++;
continue;
}
r = sd_bus_message_read_basic(m, type, &basic);
if (r < 0) {
log_error("Failed to get basic: %s", strerror(-r));
return r;
}
switch (type) {
case SD_BUS_TYPE_BYTE:
printf("%sBYTE: %u\n", prefix, basic.u8);
break;
case SD_BUS_TYPE_BOOLEAN:
printf("%sBOOLEAN: %s\n", prefix, yes_no(basic.i));
break;
case SD_BUS_TYPE_INT16:
printf("%sINT16: %i\n", prefix, basic.s16);
break;
case SD_BUS_TYPE_UINT16:
printf("%sUINT16: %u\n", prefix, basic.u16);
break;
case SD_BUS_TYPE_INT32:
printf("%sINT32: %i\n", prefix, basic.s32);
break;
case SD_BUS_TYPE_UINT32:
printf("%sUINT32: %u\n", prefix, basic.u32);
break;
case SD_BUS_TYPE_INT64:
printf("%sINT64: %lli\n", prefix, (long long) basic.s64);
break;
case SD_BUS_TYPE_UINT64:
printf("%sUINT64: %llu\n", prefix, (unsigned long long) basic.u64);
break;
case SD_BUS_TYPE_DOUBLE:
printf("%sDOUBLE: %g\n", prefix, basic.d64);
break;
case SD_BUS_TYPE_STRING:
printf("%sSTRING: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_OBJECT_PATH:
printf("%sOBJECT_PATH: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_SIGNATURE:
printf("%sSIGNATURE: \"%s\"\n", prefix, basic.string);
break;
case SD_BUS_TYPE_UNIX_FD:
printf("%sUNIX_FD: %i\n", prefix, basic.i);
break;
default:
assert_not_reached("Unknown basic type.");
}
}
printf("} END_MESSAGE\n");
return 0;
}
int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
size_t total;
unsigned i;
void *p, *e;
assert(m);
assert(buffer);
assert(sz);
for (i = 0, total = 0; i < m->n_iovec; i++)
total += m->iovec[i].iov_len;
p = malloc(total);
if (!p)
return -ENOMEM;
for (i = 0, e = p; i < m->n_iovec; i++)
e = mempcpy(e, m->iovec[i].iov_base, m->iovec[i].iov_len);
*buffer = p;
*sz = total;
return 0;
}
int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
int r;
assert(m);
assert(l);
r = sd_bus_message_enter_container(m, 'a', "s");
if (r < 0)
return r;
for (;;) {
const char *s;
r = sd_bus_message_read_basic(m, 's', &s);
if (r < 0)
return r;
if (r == 0)
break;
r = strv_extend(l, s);
if (r < 0)
return r;
}
r = sd_bus_message_exit_container(m);
if (r < 0)
return r;
return 0;
}
const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
int r;
const char *t;
char type;
assert(m);
r = sd_bus_message_rewind(m, true);
if (r < 0)
return NULL;
while (i > 0) {
r = sd_bus_message_peek_type(m, &type, NULL);
if (r < 0)
return NULL;
if (type != SD_BUS_TYPE_STRING &&
type != SD_BUS_TYPE_OBJECT_PATH &&
type != SD_BUS_TYPE_SIGNATURE)
return NULL;
r = sd_bus_message_read_basic(m, type, &t);
if (r < 0)
return NULL;
i--;
}
r = sd_bus_message_rewind(m, true);
if (r < 0)
return NULL;
return t;
}