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transmission/gtk/ipc.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2006-2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include "transmission.h"
#include "bencode.h"
#include "conf.h"
#include "io.h"
#include "ipc.h"
#include "tr_prefs.h"
#include "util.h"
/* IPC protocol version */
#define PROTO_VERS_MIN ( 1 )
#define PROTO_VERS_MAX ( 1 )
/* int, IPC protocol version */
#define MSG_VERSION ("version")
/* list of strings, full paths to torrent files to load */
#define MSG_ADDFILES ("addfiles")
/* request that the server quit */
#define MSG_QUIT ("quit")
enum contype { CON_SERV, CON_CLIENT };
struct constate_serv {
void *wind;
add_torrents_func_t addfunc;
callbackfunc_t quitfunc;
void *cbdata;
};
enum client_cmd { CCMD_ADD, CCMD_QUIT };
struct constate_client {
GMainLoop *loop;
enum client_cmd cmd;
GList *files;
gboolean *succeeded;
unsigned int msgid;
};
struct constate;
typedef void (*handler_func_t)(struct constate*, const char*, benc_val_t *);
struct handlerdef {char *name; handler_func_t func;};
struct constate {
GSource *source;
int fd;
int vers;
const struct handlerdef *funcs;
enum contype type;
union {
struct constate_serv serv;
struct constate_client client;
} u;
};
static void
serv_bind(struct constate *con);
static void
rmsock(void);
static gboolean
client_connect(char *path, struct constate *con);
static void
srv_io_accept(GSource *source, int fd, struct sockaddr *sa, socklen_t len,
void *vdata);
static int
send_msg(struct constate *con, const char *name, benc_val_t *val);
static int
send_msg_vers_new(struct constate *con);
static int
send_msg_vers_old(struct constate *con);
static unsigned int
all_io_received(GSource *source, char *data, unsigned int len, void *vdata);
static void
destroycon(struct constate *con);
static void
all_io_closed(GSource *source, void *vdata);
static void
srv_vers(struct constate *con, const char *name, benc_val_t *val);
static void
srv_addfile(struct constate *con, const char *name, benc_val_t *val);
static void
srv_quit( struct constate * con, const char * name, benc_val_t * val );
static void
afc_version(struct constate *con, const char *name, benc_val_t *val);
static void
afc_io_sent(GSource *source, unsigned int id, void *vdata);
static int
ipc_checkversion( benc_val_t * vers );
static int
getvers( benc_val_t * dict, const char * key );
static const struct handlerdef gl_funcs_serv[] = {
{MSG_VERSION, srv_vers},
{MSG_ADDFILES, srv_addfile},
{MSG_QUIT, srv_quit},
{NULL, NULL}
};
static const struct handlerdef gl_funcs_client[] = {
{MSG_VERSION, afc_version},
{NULL, NULL}
};
/* this is only used on the server */
static char *gl_sockpath = NULL;
void
ipc_socket_setup( void * parent, add_torrents_func_t addfunc,
callbackfunc_t quitfunc, void * cbdata )
{
struct constate *con;
con = g_new0(struct constate, 1);
con->source = NULL;
con->fd = -1;
con->vers = -1;
con->funcs = gl_funcs_serv;
con->type = CON_SERV;
con->u.serv.wind = parent;
con->u.serv.addfunc = addfunc;
con->u.serv.quitfunc = quitfunc;
con->u.serv.cbdata = cbdata;
serv_bind(con);
}
static gboolean
blocking_client( enum client_cmd cmd, GList * files )
{
struct constate *con;
char *path;
gboolean ret = FALSE;
con = g_new0(struct constate, 1);
con->source = NULL;
con->fd = -1;
con->vers = -1;
con->funcs = gl_funcs_client;
con->type = CON_CLIENT;
con->u.client.loop = g_main_loop_new(NULL, TRUE);
con->u.client.cmd = cmd;
con->u.client.files = files;
con->u.client.succeeded = &ret;
con->u.client.msgid = 0;
path = cf_sockname();
if(!client_connect(path, con)) {
g_free(path);
destroycon(con);
return FALSE;
}
g_main_loop_run(con->u.client.loop);
return ret;
}
gboolean
ipc_sendfiles_blocking( GList * files )
{
return blocking_client( CCMD_ADD, files );
}
gboolean
ipc_sendquit_blocking( void )
{
return blocking_client( CCMD_QUIT, NULL );
}
/* open a local socket for clients connections */
static void
serv_bind(struct constate *con) {
struct sockaddr_un sa;
rmsock();
gl_sockpath = cf_sockname();
if(0 > (con->fd = socket(AF_LOCAL, SOCK_STREAM, 0)))
goto fail;
bzero(&sa, sizeof(sa));
sa.sun_family = AF_LOCAL;
strncpy(sa.sun_path, gl_sockpath, sizeof(sa.sun_path) - 1);
/* unlink any existing socket file before trying to create ours */
unlink(gl_sockpath);
if(0 > bind(con->fd, (struct sockaddr *)&sa, SUN_LEN(&sa))) {
/* bind may fail if there was already a socket, so try twice */
unlink(gl_sockpath);
if(0 > bind(con->fd, (struct sockaddr *)&sa, SUN_LEN(&sa)))
goto fail;
}
if(0 > listen(con->fd, 5))
goto fail;
con->source = io_new_listening(con->fd, sizeof(struct sockaddr_un),
srv_io_accept, all_io_closed, con);
g_atexit(rmsock);
return;
fail:
errmsg(con->u.serv.wind, _("Failed to set up socket:\n%s"),
strerror(errno));
if(0 <= con->fd)
close(con->fd);
con->fd = -1;
rmsock();
}
static void
rmsock(void) {
if(NULL != gl_sockpath) {
unlink(gl_sockpath);
g_free(gl_sockpath);
}
}
static gboolean
client_connect(char *path, struct constate *con) {
struct sockaddr_un addr;
if(0 > (con->fd = socket(AF_UNIX, SOCK_STREAM, 0))) {
fprintf(stderr, _("failed to create socket: %s\n"), strerror(errno));
return FALSE;
}
bzero(&addr, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
if(0 > connect(con->fd, (struct sockaddr*)&addr, SUN_LEN(&addr))) {
fprintf(stderr, _("failed to connect to %s: %s\n"), path, strerror(errno));
return FALSE;
}
con->source = io_new(con->fd, afc_io_sent, all_io_received,
all_io_closed, con);
if( NULL != con->source )
{
send_msg_vers_new( con );
}
return TRUE;
}
static void
srv_io_accept(GSource *source SHUTUP, int fd, struct sockaddr *sa SHUTUP,
socklen_t len SHUTUP, void *vdata) {
struct constate *con = vdata;
struct constate *newcon;
newcon = g_new(struct constate, 1);
memcpy(newcon, con, sizeof(*newcon));
newcon->fd = fd;
newcon->source = io_new(fd, NULL, all_io_received, all_io_closed, newcon);
/* XXX need to check for incoming version from client */
if(NULL != newcon->source)
/* XXX need to switch to new version scheme after the next release */
send_msg_vers_old( newcon );
else {
g_free(newcon);
close(fd);
}
}
static int
send_msg(struct constate *con, const char *name, benc_val_t *val) {
char *buf;
int used, total;
benc_val_t dict;
char stupid;
/* construct a dictionary value */
/* XXX I shouldn't be constructing benc_val_t's by hand */
bzero(&dict, sizeof(dict));
dict.type = TYPE_DICT;
dict.val.l.alloc = 2;
dict.val.l.count = 2;
dict.val.l.vals = g_new0(benc_val_t, 2);
dict.val.l.vals[0].type = TYPE_STR;
dict.val.l.vals[0].val.s.i = strlen(name);
dict.val.l.vals[0].val.s.s = (char*)name;
dict.val.l.vals[1] = *val;
/* bencode the dictionary, starting at offset 8 in the buffer */
buf = malloc(9);
g_assert(NULL != buf);
total = 9;
used = 8;
if(tr_bencSave(&dict, &buf, &used, &total)) {
g_assert_not_reached();
}
g_free(dict.val.l.vals);
/* write the bencoded data length into the first 8 bytes of the buffer */
stupid = buf[8];
snprintf(buf, 9, "%08X", (unsigned int)used - 8);
buf[8] = stupid;
/* send the data */
return io_send_keepdata(con->source, buf, used);
}
static int
send_msg_vers_new( struct constate * con )
{
benc_val_t dict;
/* XXX ugh, I need to merge the pex branch and use it's benc funcs */
bzero( &dict, sizeof dict );
dict.type = TYPE_DICT;
dict.val.l.alloc = 4;
dict.val.l.count = 4;
dict.val.l.vals = g_new0( benc_val_t, 4 );
dict.val.l.vals[0].type = TYPE_STR;
dict.val.l.vals[0].val.s.i = 3;
dict.val.l.vals[0].val.s.s = "min";
dict.val.l.vals[1].type = TYPE_INT;
dict.val.l.vals[1].val.i = PROTO_VERS_MIN;
dict.val.l.vals[2].type = TYPE_STR;
dict.val.l.vals[2].val.s.i = 3;
dict.val.l.vals[2].val.s.s = "max";
dict.val.l.vals[3].type = TYPE_INT;
dict.val.l.vals[3].val.i = PROTO_VERS_MAX;
return send_msg( con, MSG_VERSION, &dict );
}
static int
send_msg_vers_old( struct constate * con )
{
benc_val_t val;
bzero( &val, sizeof val );
val.type = TYPE_INT;
val.val.i = PROTO_VERS_MIN;
return send_msg( con, MSG_VERSION, &val );
}
static unsigned int
all_io_received(GSource *source, char *data, unsigned int len, void *vdata) {
struct constate *con = vdata;
size_t size;
char stupid;
char *end;
benc_val_t msgs;
int ii, jj;
if(9 > len)
return 0;
stupid = data[8];
data[8] = '\0';
size = strtoul(data, NULL, 16);
data[8] = stupid;
if(size + 8 > len)
return 0;
if(!tr_bencLoad(data + 8, size, &msgs, &end) && TYPE_DICT == msgs.type) {
for(ii = 0; msgs.val.l.count > ii + 1; ii += 2)
if(TYPE_STR == msgs.val.l.vals[ii].type)
for(jj = 0; NULL != con->funcs[jj].name; jj++)
if(0 == strcmp(msgs.val.l.vals[ii].val.s.s, con->funcs[jj].name)) {
con->funcs[jj].func(con, msgs.val.l.vals[ii].val.s.s,
msgs.val.l.vals + ii + 1);
break;
}
tr_bencFree(&msgs);
}
return size + 8 +
all_io_received(source, data + size + 8, len - size - 8, con);
}
static void
destroycon(struct constate *con) {
con->source = NULL;
if(0 <= con->fd)
close(con->fd);
con->fd = -1;
switch(con->type) {
case CON_SERV:
break;
case CON_CLIENT:
freestrlist(con->u.client.files);
g_main_loop_quit(con->u.client.loop);
break;
}
}
static void
all_io_closed(GSource *source SHUTUP, void *vdata) {
struct constate *con = vdata;
destroycon(con);
}
static void
srv_vers( struct constate * con, const char * name SHUTUP, benc_val_t * val )
{
if( 0 > con->vers )
{
con->vers = ipc_checkversion( val );
if( 0 > con->vers )
{
fprintf( stderr, _("bad IPC protocol version\n") );
destroycon( con );
return;
}
}
}
static void
srv_addfile(struct constate *con, const char *name SHUTUP, benc_val_t *val) {
struct constate_serv *srv = &con->u.serv;
GList *files;
int ii;
guint flags;
if(TYPE_LIST == val->type) {
files = NULL;
for(ii = 0; ii < val->val.l.count; ii++)
if(TYPE_STR == val->val.l.vals[ii].type &&
/* XXX somehow escape invalid utf-8 */
g_utf8_validate(val->val.l.vals[ii].val.s.s, -1, NULL))
files = g_list_append(files, val->val.l.vals[ii].val.s.s);
flags = addactionflag( tr_prefs_get( PREF_ID_ADDIPC ) );
srv->addfunc( srv->cbdata, NULL, files, NULL, flags );
g_list_free(files);
}
}
static void
srv_quit( struct constate * con, const char * name SHUTUP,
benc_val_t * val SHUTUP )
{
struct constate_serv * srv;
srv = &con->u.serv;
srv->quitfunc( srv->cbdata );
}
static void
afc_version(struct constate *con, const char *name SHUTUP, benc_val_t *val) {
struct constate_client *afc = &con->u.client;
GList *file;
benc_val_t list, *str;
if( 0 > con->vers )
{
con->vers = ipc_checkversion( val );
if( 0 > con->vers )
{
fprintf( stderr, _("bad IPC protocol version\n") );
destroycon( con );
return;
}
}
else
{
return;
}
/* XXX handle getting a non-version tag, invalid data,
or nothing (read timeout) */
switch( afc->cmd )
{
case CCMD_ADD:
list.type = TYPE_LIST;
list.val.l.alloc = g_list_length(afc->files);
list.val.l.count = 0;
list.val.l.vals = g_new0(benc_val_t, list.val.l.alloc);
for(file = afc->files; NULL != file; file = file->next) {
str = list.val.l.vals + list.val.l.count;
str->type = TYPE_STR;
str->val.s.i = strlen(file->data);
str->val.s.s = file->data;
list.val.l.count++;
}
g_list_free(afc->files);
afc->files = NULL;
afc->msgid = send_msg(con, MSG_ADDFILES, &list);
tr_bencFree(&list);
break;
case CCMD_QUIT:
bzero( &list, sizeof( list ) );
list.type = TYPE_STR;
afc->msgid = send_msg( con, MSG_QUIT, &list );
break;
}
}
static void
afc_io_sent(GSource *source SHUTUP, unsigned int id, void *vdata) {
struct constate_client *afc = &((struct constate*)vdata)->u.client;
if(0 < id && afc->msgid == id) {
*(afc->succeeded) = TRUE;
destroycon(vdata);
}
}
int
ipc_checkversion( benc_val_t * vers )
{
int min, max;
if( TYPE_INT == vers->type )
{
if( 0 > vers->val.i )
{
return -1;
}
min = max = vers->val.i;
}
else if( TYPE_DICT == vers->type )
{
min = getvers( vers, "min" );
max = getvers( vers, "max" );
if( 0 > min || 0 > max )
{
return -1;
}
}
else
{
return -1;
}
g_assert( PROTO_VERS_MIN <= PROTO_VERS_MAX );
if( min > max || PROTO_VERS_MAX < min || PROTO_VERS_MIN > max )
{
return -1;
}
return MIN( PROTO_VERS_MAX, max );
}
int
getvers( benc_val_t * dict, const char * key )
{
benc_val_t * val;
val = tr_bencDictFind( dict, key );
if( NULL == val || TYPE_INT != val->type || 0 > val->val.i )
{
return -1;
}
return val->val.i;
}
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