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Systemd/src/libsystemd-bus/test-bus-chat.c
Lennart Poettering 5b12334d35 bus: add new sd_bus_creds object to encapsulate process credentials 
This way we can unify handling of credentials that are attached to
messages, or can be queried for bus name owners or connection peers.

This also adds the ability to extend incomplete credential information
with data from /proc,

Also, provide a convenience call that will automatically determine the
most appropriate credential object for an incoming message, by using the
the attached information if possible, the sending name information if
available and otherwise the peer's credentials.
2013-11-28 18:42:18 +01:00

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/*-*- 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 <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include "log.h"
#include "util.h"
#include "macro.h"
#include "sd-bus.h"
#include "bus-message.h"
#include "bus-error.h"
#include "bus-match.h"
#include "bus-internal.h"
#include "bus-util.h"
static int match_callback(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
log_info("Match triggered! interface=%s member=%s", strna(sd_bus_message_get_interface(m)), strna(sd_bus_message_get_member(m)));
return 0;
}
static int object_callback(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
int r;
assert(bus);
if (sd_bus_message_is_method_error(m, NULL))
return 0;
if (sd_bus_message_is_method_call(m, "org.object.test", "Foobar")) {
log_info("Invoked Foobar() on %s", sd_bus_message_get_path(m));
r = sd_bus_reply_method_return(m, NULL);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
return r;
}
return 1;
}
return 0;
}
static int server_init(sd_bus **_bus) {
sd_bus *bus = NULL;
sd_id128_t id;
int r;
const char *unique;
assert(_bus);
r = sd_bus_open_user(&bus);
if (r < 0) {
log_error("Failed to connect to user bus: %s", strerror(-r));
goto fail;
}
r = sd_bus_get_server_id(bus, &id);
if (r < 0) {
log_error("Failed to get server ID: %s", strerror(-r));
goto fail;
}
r = sd_bus_get_unique_name(bus, &unique);
if (r < 0) {
log_error("Failed to get unique name: %s", strerror(-r));
goto fail;
}
log_info("Peer ID is " SD_ID128_FORMAT_STR ".", SD_ID128_FORMAT_VAL(id));
log_info("Unique ID: %s", unique);
log_info("Can send file handles: %i", sd_bus_can_send(bus, 'h'));
r = sd_bus_request_name(bus, "org.freedesktop.systemd.test", 0);
if (r < 0) {
log_error("Failed to acquire name: %s", strerror(-r));
goto fail;
}
r = sd_bus_add_fallback(bus, "/foo/bar", object_callback, NULL);
if (r < 0) {
log_error("Failed to add object: %s", strerror(-r));
goto fail;
}
r = sd_bus_add_match(bus, "type='signal',interface='foo.bar',member='Notify'", match_callback, NULL);
if (r < 0) {
log_error("Failed to add match: %s", strerror(-r));
goto fail;
}
r = sd_bus_add_match(bus, "type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged'", match_callback, NULL);
if (r < 0) {
log_error("Failed to add match: %s", strerror(-r));
goto fail;
}
bus_match_dump(&bus->match_callbacks, 0);
*_bus = bus;
return 0;
fail:
if (bus)
sd_bus_unref(bus);
return r;
}
static int server(sd_bus *bus) {
int r;
bool client1_gone = false, client2_gone = false;
while (!client1_gone || !client2_gone) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
pid_t pid = 0;
const char *label = NULL;
r = sd_bus_process(bus, &m);
if (r < 0) {
log_error("Failed to process requests: %s", strerror(-r));
goto fail;
}
if (r == 0) {
r = sd_bus_wait(bus, (uint64_t) -1);
if (r < 0) {
log_error("Failed to wait: %s", strerror(-r));
goto fail;
}
continue;
}
if (!m)
continue;
sd_bus_creds_get_pid(sd_bus_message_get_creds(m), &pid);
sd_bus_creds_get_selinux_context(sd_bus_message_get_creds(m), &label);
log_info("Got message! member=%s pid=%lu label=%s",
strna(sd_bus_message_get_member(m)),
(unsigned long) pid,
strna(label));
/* bus_message_dump(m); */
/* sd_bus_message_rewind(m, true); */
if (sd_bus_message_is_method_call(m, "org.freedesktop.systemd.test", "LowerCase")) {
const char *hello;
_cleanup_free_ char *lowercase = NULL;
r = sd_bus_message_read(m, "s", &hello);
if (r < 0) {
log_error("Failed to get parameter: %s", strerror(-r));
goto fail;
}
lowercase = strdup(hello);
if (!lowercase) {
r = log_oom();
goto fail;
}
ascii_strlower(lowercase);
r = sd_bus_reply_method_return(m, "s", lowercase);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.systemd.test", "ExitClient1")) {
r = sd_bus_reply_method_return(m, NULL);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
client1_gone = true;
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.systemd.test", "ExitClient2")) {
r = sd_bus_reply_method_return(m, NULL);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
client2_gone = true;
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.systemd.test", "Slow")) {
sleep(1);
r = sd_bus_reply_method_return(m, NULL);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.systemd.test", "FileDescriptor")) {
int fd;
static const char x = 'X';
r = sd_bus_message_read(m, "h", &fd);
if (r < 0) {
log_error("Failed to get parameter: %s", strerror(-r));
goto fail;
}
log_info("Received fd=%d", fd);
if (write(fd, &x, 1) < 0) {
log_error("Failed to write to fd: %m");
close_nointr_nofail(fd);
goto fail;
}
r = sd_bus_reply_method_return(m, NULL);
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
} else if (sd_bus_message_is_method_call(m, NULL, NULL)) {
r = sd_bus_reply_method_error(
m,
&SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method."));
if (r < 0) {
log_error("Failed to send reply: %s", strerror(-r));
goto fail;
}
}
}
r = 0;
fail:
if (bus) {
sd_bus_flush(bus);
sd_bus_unref(bus);
}
return r;
}
static void* client1(void*p) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
sd_bus *bus = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
const char *hello;
int r;
int pp[2] = { -1, -1 };
char x;
r = sd_bus_open_user(&bus);
if (r < 0) {
log_error("Failed to connect to user bus: %s", strerror(-r));
goto finish;
}
r = sd_bus_call_method(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"LowerCase",
&error,
&reply,
"s",
"HELLO");
if (r < 0) {
log_error("Failed to issue method call: %s", strerror(-r));
goto finish;
}
r = sd_bus_message_read(reply, "s", &hello);
if (r < 0) {
log_error("Failed to get string: %s", strerror(-r));
goto finish;
}
assert(streq(hello, "hello"));
if (pipe2(pp, O_CLOEXEC|O_NONBLOCK) < 0) {
log_error("Failed to allocate pipe: %m");
r = -errno;
goto finish;
}
log_info("Sending fd=%d", pp[1]);
r = sd_bus_call_method(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"FileDescriptor",
&error,
NULL,
"h",
pp[1]);
if (r < 0) {
log_error("Failed to issue method call: %s", strerror(-r));
goto finish;
}
errno = 0;
if (read(pp[0], &x, 1) <= 0) {
log_error("Failed to read from pipe: %s", errno ? strerror(errno) : "early read");
goto finish;
}
r = 0;
finish:
if (bus) {
_cleanup_bus_message_unref_ sd_bus_message *q;
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"ExitClient1",
&q);
if (r < 0)
log_error("Failed to allocate method call: %s", strerror(-r));
else
sd_bus_send(bus, q, NULL);
sd_bus_flush(bus);
sd_bus_unref(bus);
}
sd_bus_error_free(&error);
close_pipe(pp);
return INT_TO_PTR(r);
}
static int quit_callback(sd_bus *b, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
bool *x = userdata;
log_error("Quit callback: %s", strerror(sd_bus_message_get_errno(m)));
*x = 1;
return 1;
}
static void* client2(void*p) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
sd_bus *bus = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
bool quit = false;
const char *mid;
int r;
r = sd_bus_open_user(&bus);
if (r < 0) {
log_error("Failed to connect to user bus: %s", strerror(-r));
goto finish;
}
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/foo/bar/waldo/piep",
"org.object.test",
"Foobar",
&m);
if (r < 0) {
log_error("Failed to allocate method call: %s", strerror(-r));
goto finish;
}
r = sd_bus_send(bus, m, NULL);
if (r < 0) {
log_error("Failed to issue method call: %s", bus_error_message(&error, -r));
goto finish;
}
sd_bus_message_unref(m);
m = NULL;
r = sd_bus_message_new_signal(
bus,
"/foobar",
"foo.bar",
"Notify",
&m);
if (r < 0) {
log_error("Failed to allocate signal: %s", strerror(-r));
goto finish;
}
r = sd_bus_send(bus, m, NULL);
if (r < 0) {
log_error("Failed to issue signal: %s", bus_error_message(&error, -r));
goto finish;
}
sd_bus_message_unref(m);
m = NULL;
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId",
&m);
if (r < 0) {
log_error("Failed to allocate method call: %s", strerror(-r));
goto finish;
}
r = sd_bus_call(bus, m, 0, &error, &reply);
if (r < 0) {
log_error("Failed to issue method call: %s", bus_error_message(&error, -r));
goto finish;
}
r = sd_bus_message_read(reply, "s", &mid);
if (r < 0) {
log_error("Failed to parse machine ID: %s", strerror(-r));
goto finish;
}
log_info("Machine ID is %s.", mid);
sd_bus_message_unref(m);
m = NULL;
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"Slow",
&m);
if (r < 0) {
log_error("Failed to allocate method call: %s", strerror(-r));
goto finish;
}
sd_bus_message_unref(reply);
reply = NULL;
r = sd_bus_call(bus, m, 200 * USEC_PER_MSEC, &error, &reply);
if (r < 0)
log_info("Failed to issue method call: %s", bus_error_message(&error, -r));
else
log_info("Slow call succeed.");
sd_bus_message_unref(m);
m = NULL;
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"Slow",
&m);
if (r < 0) {
log_error("Failed to allocate method call: %s", strerror(-r));
goto finish;
}
r = sd_bus_call_async(bus, m, quit_callback, &quit, 200 * USEC_PER_MSEC, NULL);
if (r < 0) {
log_info("Failed to issue method call: %s", bus_error_message(&error, -r));
goto finish;
}
while (!quit) {
r = sd_bus_process(bus, NULL);
if (r < 0) {
log_error("Failed to process requests: %s", strerror(-r));
goto finish;
}
if (r == 0) {
r = sd_bus_wait(bus, (uint64_t) -1);
if (r < 0) {
log_error("Failed to wait: %s", strerror(-r));
goto finish;
}
}
}
r = 0;
finish:
if (bus) {
_cleanup_bus_message_unref_ sd_bus_message *q;
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
"/",
"org.freedesktop.systemd.test",
"ExitClient2",
&q);
if (r < 0) {
log_error("Failed to allocate method call: %s", strerror(-r));
goto finish;
}
sd_bus_send(bus, q, NULL);
sd_bus_flush(bus);
sd_bus_unref(bus);
}
sd_bus_error_free(&error);
return INT_TO_PTR(r);
}
int main(int argc, char *argv[]) {
pthread_t c1, c2;
sd_bus *bus;
void *p;
int q, r;
r = server_init(&bus);
if (r < 0) {
log_info("Failed to connect to bus, skipping tests.");
return EXIT_TEST_SKIP;
}
log_info("Initialized...");
r = pthread_create(&c1, NULL, client1, bus);
if (r != 0)
return EXIT_FAILURE;
r = pthread_create(&c2, NULL, client2, bus);
if (r != 0)
return EXIT_FAILURE;
r = server(bus);
q = pthread_join(c1, &p);
if (q != 0)
return EXIT_FAILURE;
if (PTR_TO_INT(p) < 0)
return EXIT_FAILURE;
q = pthread_join(c2, &p);
if (q != 0)
return EXIT_FAILURE;
if (PTR_TO_INT(p) < 0)
return EXIT_FAILURE;
if (r < 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
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