/
test_udevd.c
770 lines (605 loc) · 13.9 KB
/
test_udevd.c
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#include <sys/types.h>
#include <sys/device.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <sys/queue.h>
#include <sys/un.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <libprop/proplib.h>
#include <sys/udev.h>
#define LISTEN_SOCKET_FILE "/tmp/udevd.socket"
#define SOCKFILE_NAMELEN strlen(LISTEN_SOCKET_FILE)+1
int conn_local_server(const char *sockfile, int socktype, int nonblock,
int *retsock);
prop_dictionary_t udevd_get_command_dict(char *command);
void udevd_request_devs(int s);
struct udev {
int gp_fd;
int monitor_fd;
int refs;
void *userdata;
};
struct udev_enumerate {
struct udev *udev_ctx;
prop_array_t pa;
int refs;
TAILQ_HEAD(, udev_list_entry) list_entries;
};
struct udev_list_entry {
prop_dictionary_t dict;
TAILQ_ENTRY(udev_list_entry) link;
};
struct udev_monitor {
struct udev *udev_ctx;
prop_array_t ev_filt;
int socket;
int user_socket; /* maybe... one day... */
int refs;
};
struct udev_device {
struct udev *udev_ctx;
prop_dictionary_t dict;
int ev_type;
int refs;
};
struct udev *
udev_ref(struct udev *udev_ctx)
{
atomic_add_int(&udev_ctx->refs, 1);
return udev_ctx;
}
void
udev_unref(struct udev *udev_ctx)
{
int refcount;
refcount = atomic_fetchadd_int(&udev_ctx->refs, -1);
if (refcount == 1) {
atomic_subtract_int(&udev_ctx->refs, 0x400); /* in destruction */
if (udev_ctx->gp_fd != -1)
close (udev_ctx->gp_fd);
if (udev_ctx->monitor_fd != -1)
close (udev_ctx->monitor_fd);
free(udev_ctx);
}
}
struct udev *
udev_new()
{
struct udev *udev_ctx;
udev_ctx = malloc(sizeof(struct udev));
udev_ctx->refs = 1;
udev_ctx->gp_fd = -1;
udev_ctx->monitor_fd = -1;
udev_ctx->userdata = NULL;
return udev_ctx;
}
const char *udev_get_dev_path(struct udev *udev_ctx __unused)
{
return "/dev";
}
void *
udev_get_userdata(struct udev *udev_ctx)
{
return udev_ctx->userdata;
}
void
udev_set_userdata(struct udev *udev_ctx, void *userdata)
{
udev_ctx->userdata = userdata;
}
struct udev_enumerate *
udev_enumerate_new(struct udev *udev_ctx)
{
struct udev_enumerate *udev_enum;
udev_enum = malloc(sizeof(struct udev_enumerate));
udev_enum->refs = 1;
udev_enum->pa = NULL;
TAILQ_INIT(&udev_enum->list_entries);
udev_enum->udev_ctx = udev_ref(udev_ctx);
}
struct udev_enumerate *
udev_enumerate_ref(struct udev_enumerate *udev_enum)
{
atomic_add_int(&udev_enum->refs, 1);
return udev_enum;
}
void
udev_enumerate_unref(struct udev_enumerate *udev_enum)
{
struct udev_list_entry *le;
int refcount;
refcount = atomic_fetchadd_int(&udev_enum->refs, -1);
if (refcount == 1) {
atomic_subtract_int(&udev_enum->refs, 0x400); /* in destruction */
if (udev_enum->pa != NULL)
prop_object_release(udev_enum->pa);
while (!TAILQ_EMPTY(&udev_enum->list_entries)) {
le = TAILQ_FIRST(&udev_enum->list_entries);
TAILQ_REMOVE(&udev_enum->list_entries, le, link);
prop_object_release(le->dict);
free(le);
}
udev_unref(udev_enum->udev_ctx);
free(udev_enum);
}
}
struct udev *
udev_enumerate_get_udev(struct udev_enumerate *udev_enum)
{
return udev_enum->udev_ctx;
}
int
udev_enumerate_scan_devices(struct udev_enumerate *udev_enum)
{
prop_array_t pa;
if (udev_enum->udev_ctx->gp_fd == -1)
return -1;
pa = udevd_request_devs(udev_enum->udev_ctx->gp_fd);
if (pa == NULL)
return -1;
prop_object_retain(pa);
if (udev_enum->pa != NULL)
prop_object_release(udev_enum->pa);
udev_enum->iter = NULL;
udev_enum->pa = pa;
return 0;
}
struct udev_list_entry *
udev_enumerate_get_list_entry(struct udev_enumerate *udev_enum)
{
struct udev_list_entry *le;
prop_object_iterator_t iter;
/* If the list is not empty, assume it was populated in an earlier call */
if (!TAILQ_EMPTY(&udev_enum->list_entries))
return TAILQ_FIRST(&udev_enum->list_entries);
iter = prop_array_iterator(udev_enum->pa);
if (iter == NULL)
return NULL;
while ((dict = prop_object_iterator_next(iter)) != NULL) {
le = malloc(sizeof(struct udev_list_entry));
if (le == NULL)
goto out;
prop_object_retain(dict);
le->dict = dict;
TAILQ_INSERT_TAIL(&udev_enum->list_entries, le, link);
}
le = TAILQ_FIRST(&udev_enum->list_entries);
out:
prop_object_iterator_release(iter);
return le;
}
prop_array_t
udev_enumerate_get_array(struct udev_enumerate *udev_enum)
{
return udev_enum->pa;
}
struct udev_list_entry *
udev_list_entry_get_next(struct udev_list_entry *list_entry)
{
return TAILQ_NEXT(list_entry, link);
}
prop_dictionary_t
udev_list_entry_get_dictionary(struct udev_list_entry *list_entry)
{
return list_entry->dict;
}
#define udev_list_entry_foreach(list_entry, first_entry) \
for(list_entry = first_entry; \
list_entry != NULL; \
list_entry = udev_list_entry_get_next(list_entry))
struct udev_monitor *
udev_monitor_new(struct udev *udev_ctx)
{
struct udev_monitor *udev_monitor;
int ret, s;
ret = conn_local_server(LISTEN_SOCKET_FILE, SOCK_STREAM, 0, &s);
if (ret < 0)
return NULL;
udev_monitor = malloc(sizeof(struct udev_monitor));
if (udev_monitor == NULL)
return NULL;
udev_monitor->refs = 1;
udev_monitor->ev_filt = NULL;
udev_monitor->socket = s;
udev_monitor->user_socket = 1;
udev_monitor->udev_ctx = udev_ref(udev_ctx);
return udev_monitor;
}
struct udev_monitor *
udev_monitor_ref(struct udev_monitor *udev_monitor)
{
atomic_add_int(&udev_monitor->refs, 1);
return udev_monitor;
}
void
udev_monitor_unref(struct udev_monitor *udev_monitor)
{
int refcount;
refcount = atomic_fetchadd_int(&udev_monitor->refs, -1);
if (refcount == 1) {
atomic_subtract_int(&udev_monitor->refs, 0x400); /* in destruction */
if (udev_monitor->ev_filt != NULL)
prop_object_release(udev_monitor->ev_filt);
if (udev_monitor->socket != -1)
close(udev_monitor->socket);
if (udev_monitor->user_socket != -1)
close(udev_monitor->user_socket);
udev_unref(udev_monitor->udev_ctx);
free(udev_monitor);
}
}
struct udev *
udev_monitor_get_udev(struct udev_monitor *udev_monitor)
{
return udev_monitor->udev_ctx;
}
int
udev_monitor_get_fd(struct udev_monitor *udev_monitor)
{
return udev_monitor->socket;
}
struct udev_device *
udev_monitor_receive_device(struct udev_monitor *udev_monitor)
{
struct udev_device *udev_dev;
prop_dictionary_t dict;
prop_number_t pn;
char *xml;
int n, evtype;
xml = malloc(12*1024*1024);
if (xml == NULL)
return NULL;
if ((n = read_xml(udev_monitor->socket, xml, 12*1024*1024)) <= 0) {
free(xml);
return NULL;
}
xml[n+1] = '\0';
dict = prop_dictionary_internalize(xml);
free(xml);
if (dict == NULL)
return NULL;
pn = prop_dictionary_get(dict, "evtype");
if (pn == NULL) {
prop_object_release(dict);
return NULL;
}
udev_dev = malloc(sizeof(struct udev_dev));
if (udev_dev == NULL) {
prop_object_release(dict);
return NULL;
}
udev_dev->refs = 1;
udev_dev->ev_type = prop_number_integer_value(pn);
udev_dev->dict = prop_dictionary_get(dict, "evdict");
if (udev_dev->dict == NULL) {
free(udev_dev);
return NULL;
}
udev_dev->udev_ctx = udev_ref(udev_monitor->udev_ctx);
out:
return udev_dev;
}
int
udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
{
prop_dictionary_t dict;
char *xml;
/* ->socket, ->user_socket, ->ev_filt */
dict = udevd_get_command_dict(__DECONST(char *, "monitor"));
if (dict == NULL)
return -1;
/* Add event filters to message, if available */
if (udev_monitor->ev_filt != NULL) {
if (prop_dictionary_set(dict, "filters",
udev_monitor->ev_filt) == false) {
prop_object_release(dict);
return -1;
}
}
xml = prop_dictionary_externalize(dict);
prop_object_release(dict);
if (xml == NULL)
return -1;
n = send_xml(udev_monitor->socket, xml);
free(xml);
if (n <= 0)
return NULL;
return 0;
}
int
udev_monitor_filter_add_match_subsystem_devtype(struct udev_monitor *udev_monitor,
const char *subsystem,
const char *devtype __unused)
{
int ret;
ret = _udev_monitor_filter_add_match_gen(udev_monitor,
EVENT_FILTER_TYPE_WILDCARD,
0,
"subsystem",
subsystem);
return ret;
}
int
udev_monitor_filter_add_match_expr(struct udev_monitor *udev_monitor,
const char *key,
char *expr)
{
int ret;
ret = _udev_monitor_filter_add_match_gen(udev_monitor,
EVENT_FILTER_TYPE_WILDCARD,
0,
key,
expr);
return ret;
}
int
udev_monitor_filter_add_nomatch_expr(struct udev_monitor *udev_monitor,
const char *key,
char *expr)
{
int ret;
ret = _udev_monitor_filter_add_match_gen(udev_monitor,
EVENT_FILTER_TYPE_WILDCARD,
1,
key,
expr);
return ret;
}
int
udev_monitor_filter_add_match_regex(struct udev_monitor *udev_monitor,
const char *key,
char *expr)
{
int ret;
ret = _udev_monitor_filter_add_match_gen(udev_monitor,
EVENT_FILTER_TYPE_REGEX,
0,
key,
expr);
return ret;
}
int
udev_monitor_filter_add_nomatch_regex(struct udev_monitor *udev_monitor,
const char *key,
char *expr)
{
int ret;
ret = _udev_monitor_filter_add_match_gen(udev_monitor,
EVENT_FILTER_TYPE_REGEX,
1,
key,
expr);
return ret;
}
int
_udev_monitor_filter_add_match_gen(struct udev_monitor *udev_monitor,
int type,
int neg,
const char *key,
char *expr)
{
prop_array_t pa;
prop_dictionary_t dict;
int error;
if (subsystem == NULL)
return NULL;
dict = prop_dictionary_create();
if (dict == NULL)
return -1;
error = _udev_dict_set_cstr(dict, "key", key);
if (error != 0)
goto error_out;
error = _udev_dict_set_int(dict, "type", type);
if (error != 0)
goto error_out;
error = _udev_dict_set_int(dict, "expr", expr);
if (error != 0)
goto error_out;
if (neg) {
error = _udev_dict_set_int(dict, "negative", 1);
if (error != 0)
goto error_out;
}
if (udev_monitor->ev_filt == NULL) {
pa = prop_array_create();
if (pa == NULL)
goto error_out;
udev_monitor->ev_filt = pa;
}
if (prop_array_add(udev_monitor->ev_filt, dict) == false)
goto error_out;
return 0;
error_out:
prop_object_release(dict);
return -1;
}
struct udev_device *
udev_device_ref(struct udev_device *udev_device)
{
atomic_add_int(&udev_device->refs, 1);
return udev_device;
}
void
udev_device_unref(struct udev_device *udev_device)
{
int refcount;
refcount = atomic_fetchadd_int(&udev_device->refs, -1);
if (refcount == 1) {
atomic_subtract_int(&udev_device->refs, 0x400); /* in destruction */
if (udev_device->dict != NULL)
prop_object_release(udev_device->dict);
udev_unref(udev_device->udev_ctx);
free(udev_device);
}
}
prop_dictionary_t
udev_device_get_dictionary(struct udev_device *udev_device)
{
return udev_device->dict;
}
struct udev *
udev_device_get_udev(struct udev_device *udev_device)
{
return udev_device->udev_ctx;
}
int
send_xml(int s, char *xml)
{
ssize_t r,n;
size_t sz;
sz = strlen(xml) + 1;
r = send(s, &sz, sizeof(sz), 0);
if (r <= 0)
return r;
r = 0;
while (r < (ssize_t)sz) {
n = send(s, xml+r, sz-r, 0);
if (n <= 0)
return n;
r += n;
}
return r;
}
int
read_xml(int s, char *buf, size_t buf_sz)
{
size_t sz;
int n, r;
n = recv(s, &sz, sizeof(sz), MSG_WAITALL);
if (n <= 0)
return n;
r = 0;
while ((r < (ssize_t)sz) && (r < (ssize_t)buf_sz)) {
n = recv(s, buf+r, sz-r, MSG_WAITALL);
if (n <= 0)
return n;
r += n;
}
return r;
}
static int
_udev_dict_set_cstr(prop_dictionary_t dict, const char *key, char *str)
{
prop_string_t ps;
ps = prop_string_create_cstring(str);
if (ps == NULL)
return ENOMEM;
if (prop_dictionary_set(dict, key, ps) == false) {
prop_object_release(ps);
return ENOMEM;
}
prop_object_release(ps);
return 0;
}
static int
_udev_dict_set_int(prop_dictionary_t dict, const char *key, int64_t val)
{
prop_number_t pn;
pn = prop_number_create_integer(val);
if (pn == NULL)
return ENOMEM;
if (prop_dictionary_set(dict, key, pn) == false) {
prop_object_release(pn);
return ENOMEM;
}
prop_object_release(pn);
return 0;
}
static int
_udev_dict_set_uint(prop_dictionary_t dict, const char *key, uint64_t val)
{
prop_number_t pn;
pn = prop_number_create_unsigned_integer(val);
if (pn == NULL)
return ENOMEM;
if (prop_dictionary_set(dict, key, pn) == false) {
prop_object_release(pn);
return ENOMEM;
}
prop_object_release(pn);
return 0;
}
int
conn_local_server(const char *sockfile, int socktype, int nonblock,
int *retsock)
{
int s;
struct sockaddr_un serv_addr;
*retsock = -1;
if ((s = socket(AF_UNIX, socktype, 0)) < 0)
return -1;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sun_family = AF_UNIX;
strncpy(serv_addr.sun_path, sockfile, SOCKFILE_NAMELEN);
serv_addr.sun_path[SOCKFILE_NAMELEN - 1] = '\0';
if (nonblock && unblock_descriptor(s) < 0) {
close(s);
return -1;
}
*retsock = s;
return connect(s, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
}
prop_dictionary_t
udevd_get_command_dict(char *command)
{
prop_dictionary_t dict;
int error;
dict = prop_dictionary_create();
if (dict == NULL)
return NULL;
if ((error = _udev_dict_set_cstr(dict, "command", command)))
goto error_out;
return dict;
error_out:
prop_object_release(dict);
return NULL;
}
prop_array_t
udevd_request_devs(int s)
{
prop_array_t pa;
prop_dictionary_t dict;
char *xml;
int n, t;
dict = udevd_get_command_dict(__DECONST(char *, "getdevs"));
if (dict == NULL)
return NULL;
xml = prop_dictionary_externalize(dict);
prop_object_release(dict);
if (xml == NULL)
return NULL;
n = send_xml(s, xml);
free(xml);
if (n <= 0)
return NULL;
xml = malloc(12*1024*1024); /* generous 12 MB */
if ((n = read_xml(s, xml, 12*1024*1024)) <= 0) {
free(xml);
return NULL;
}
xml[n+1] = '\0';
pa = prop_array_internalize(xml);
free(xml);
return (pa);
}
int
main(void)
{
int ret, s;
ret = conn_local_server(LISTEN_SOCKET_FILE, SOCK_STREAM, 0, &s);
if (ret < 0)
err(1, "conn_local_server");
udevd_request_devs(s);
return 0;
}