1 /* Copyright (C) 2009 Pierre-Marc Fournier
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include <sys/types.h>
22 #include <sys/socket.h>
35 #define UNIX_PATH_MAX 108
39 /* FIXME: ustcomm blocks on message sending, which might be problematic in
40 * some cases. Fix the poll() usage so sends are buffered until they don't
44 //static void bt(void)
49 // result = backtrace(&buffer, 100);
50 // backtrace_symbols_fd(buffer, result, STDERR_FILENO);
53 char *strdup_malloc(const char *s
)
60 retval
= (char *) malloc(strlen(s
)+1);
67 static int signal_process(pid_t pid
)
71 result
= kill(pid
, UST_SIGNAL
);
77 /* FIXME: should wait in a better way */
83 int pid_is_online(pid_t pid
) {
84 return kill(pid
, UST_SIGNAL
) != -1;
87 static int send_message_fd(int fd
, const char *msg
)
91 result
= send(fd
, msg
, strlen(msg
), 0);
96 else if(result
== 0) {
103 /* Called by an app to ask the consumer daemon to connect to it. */
105 int ustcomm_request_consumer(pid_t pid
, const char *channel
)
107 char path
[UNIX_PATH_MAX
];
111 struct ustcomm_connection conn
;
113 result
= snprintf(path
, UNIX_PATH_MAX
, "%s/ustd", SOCK_DIR
);
114 if(result
>= UNIX_PATH_MAX
) {
115 ERR("string overflow allocating socket name");
119 asprintf(&msg
, "collect %d %s", pid
, channel
);
121 /* don't signal it because it's the daemon */
122 result
= ustcomm_connect_path(path
, &conn
, -1);
124 WARN("ustcomm_connect_path failed");
129 result
= ustcomm_send_request(&conn
, msg
, NULL
);
131 WARN("ustcomm_send_request failed");
137 ustcomm_disconnect(&conn
);
144 /* returns 1 to indicate a message was received
145 * returns 0 to indicate no message was received (cannot happen)
146 * returns -1 to indicate an error
149 static int recv_message_fd(int fd
, char **msg
, struct ustcomm_source
*src
)
153 *msg
= (char *) malloc(MSG_MAX
+1);
155 result
= recv(fd
, *msg
, MSG_MAX
, 0);
161 (*msg
)[result
] = '\0';
163 DBG("ustcomm_app_recv_message: result is %d, message is %s", result
, (*msg
));
171 int ustcomm_send_reply(struct ustcomm_server
*server
, char *msg
, struct ustcomm_source
*src
)
175 result
= send_message_fd(src
->fd
, msg
);
177 ERR("error in send_message_fd");
184 /* @timeout: max blocking time in milliseconds, -1 means infinity
186 * returns 1 to indicate a message was received
187 * returns 0 to indicate no message was received
188 * returns -1 to indicate an error
191 int ustcomm_recv_message(struct ustcomm_server
*server
, char **msg
, struct ustcomm_source
*src
, int timeout
)
194 struct ustcomm_connection
*conn
;
202 list_for_each_entry(conn
, &server
->connections
, list
) {
206 fds
= (struct pollfd
*) malloc(n_fds
* sizeof(struct pollfd
));
208 ERR("malloc returned NULL");
212 /* special idx 0 is for listening socket */
213 fds
[idx
].fd
= server
->listen_fd
;
214 fds
[idx
].events
= POLLIN
;
217 list_for_each_entry(conn
, &server
->connections
, list
) {
218 fds
[idx
].fd
= conn
->fd
;
219 fds
[idx
].events
= POLLIN
;
223 while((result
= poll(fds
, n_fds
, timeout
)) == -1 && errno
== EINTR
)
234 struct ustcomm_connection
*newconn
;
237 result
= newfd
= accept(server
->listen_fd
, NULL
, NULL
);
243 newconn
= (struct ustcomm_connection
*) malloc(sizeof(struct ustcomm_connection
));
244 if(newconn
== NULL
) {
245 ERR("malloc returned NULL");
251 list_add(&newconn
->list
, &server
->connections
);
254 for(idx
=1; idx
<n_fds
; idx
++) {
255 if(fds
[idx
].revents
) {
256 retval
= recv_message_fd(fds
[idx
].fd
, msg
, src
);
258 /* connection finished */
261 list_for_each_entry(conn
, &server
->connections
, list
) {
262 if(conn
->fd
== fds
[idx
].fd
) {
263 list_del(&conn
->list
);
269 goto free_fds_return
;
282 int ustcomm_ustd_recv_message(struct ustcomm_ustd
*ustd
, char **msg
, struct ustcomm_source
*src
, int timeout
)
284 return ustcomm_recv_message(&ustd
->server
, msg
, src
, timeout
);
287 int ustcomm_app_recv_message(struct ustcomm_app
*app
, char **msg
, struct ustcomm_source
*src
, int timeout
)
289 return ustcomm_recv_message(&app
->server
, msg
, src
, timeout
);
292 /* This removes src from the list of active connections of app.
295 int ustcomm_app_detach_client(struct ustcomm_app
*app
, struct ustcomm_source
*src
)
297 struct ustcomm_server
*server
= (struct ustcomm_server
*)app
;
298 struct ustcomm_connection
*conn
;
300 list_for_each_entry(conn
, &server
->connections
, list
) {
301 if(conn
->fd
== src
->fd
) {
302 list_del(&conn
->list
);
312 static int init_named_socket(const char *name
, char **path_out
)
317 struct sockaddr_un addr
;
319 result
= fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
325 addr
.sun_family
= AF_UNIX
;
327 strncpy(addr
.sun_path
, name
, UNIX_PATH_MAX
);
328 addr
.sun_path
[UNIX_PATH_MAX
-1] = '\0';
330 result
= access(name
, F_OK
);
333 result
= unlink(name
);
335 PERROR("unlink of socket file");
338 WARN("socket already exists; overwriting");
341 result
= bind(fd
, (struct sockaddr
*)&addr
, sizeof(addr
));
347 result
= listen(fd
, 1);
355 *path_out
= strdupa(addr
.sun_path
);
366 int ustcomm_send_request(struct ustcomm_connection
*conn
, const char *req
, char **reply
)
370 result
= send(conn
->fd
, req
, strlen(req
), 0);
379 *reply
= (char *) malloc(MSG_MAX
+1);
380 result
= recv(conn
->fd
, *reply
, MSG_MAX
, 0);
385 else if(result
== 0) {
389 (*reply
)[result
] = '\0';
394 int ustcomm_connect_path(const char *path
, struct ustcomm_connection
*conn
, pid_t signalpid
)
398 struct sockaddr_un addr
;
400 result
= fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
406 addr
.sun_family
= AF_UNIX
;
408 result
= snprintf(addr
.sun_path
, UNIX_PATH_MAX
, "%s", path
);
409 if(result
>= UNIX_PATH_MAX
) {
410 ERR("string overflow allocating socket name");
415 result
= signal_process(signalpid
);
417 ERR("could not signal process");
422 result
= connect(fd
, (struct sockaddr
*)&addr
, sizeof(addr
));
433 int ustcomm_disconnect(struct ustcomm_connection
*conn
)
435 return close(conn
->fd
);
438 int ustcomm_connect_app(pid_t pid
, struct ustcomm_connection
*conn
)
441 char path
[UNIX_PATH_MAX
];
444 result
= snprintf(path
, UNIX_PATH_MAX
, "%s/%d", SOCK_DIR
, pid
);
445 if(result
>= UNIX_PATH_MAX
) {
446 ERR("string overflow allocating socket name");
450 return ustcomm_connect_path(path
, conn
, pid
);
453 /* Called by an application to initialize its server so daemons can
457 int ustcomm_init_app(pid_t pid
, struct ustcomm_app
*handle
)
462 result
= asprintf(&name
, "%s/%d", SOCK_DIR
, (int)pid
);
463 if(result
>= UNIX_PATH_MAX
) {
464 ERR("string overflow allocating socket name");
468 handle
->server
.listen_fd
= init_named_socket(name
, &(handle
->server
.socketpath
));
469 if(handle
->server
.listen_fd
< 0) {
470 ERR("error initializing named socket");
475 INIT_LIST_HEAD(&handle
->server
.connections
);
484 /* Used by the daemon to initialize its server so applications
488 int ustcomm_init_ustd(struct ustcomm_ustd
*handle
)
493 result
= asprintf(&name
, "%s/%s", SOCK_DIR
, "ustd");
494 if(result
>= UNIX_PATH_MAX
) {
495 ERR("string overflow allocating socket name");
499 handle
->server
.listen_fd
= init_named_socket(name
, &handle
->server
.socketpath
);
500 if(handle
->server
.listen_fd
< 0) {
501 ERR("error initializing named socket at %s", name
);
506 INIT_LIST_HEAD(&handle
->server
.connections
);
515 static char *find_tok(char *str
)
527 static char *find_sep(char *str
)
539 int nth_token_is(char *str
, char *token
, int tok_no
)
545 for(i
=0; i
<=tok_no
; i
++) {
559 if(end
-start
!= strlen(token
))
562 if(strncmp(start
, token
, end
-start
))
568 char *nth_token(char *str
, int tok_no
)
570 static char *retval
= NULL
;
575 for(i
=0; i
<=tok_no
; i
++) {
594 asprintf(&retval
, "%.*s", (int)(end
-start
), start
);
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