afs.c: Introduce client list for afs (fixes dosable bug).
[paraslash.git] / afs.c
diff --git a/afs.c b/afs.c
index c726f35..f6d6b8d 100644 (file)
--- a/afs.c
+++ b/afs.c
@@ -6,6 +6,8 @@
 
 /** \file afs.c Paraslash's audio file selector. */
 
+#include <signal.h>
+#include <fnmatch.h>
 #include "server.cmdline.h"
 #include "para.h"
 #include "afh.h"
@@ -144,11 +146,12 @@ int send_callback_request(callback_function *f, struct osl_object *query,
        int ret, fd = -1, query_shmid, result_shmid;
        void *query_shm, *result_shm;
        char buf[sizeof(afs_socket_cookie) + sizeof(int)];
-//     char *tmpsocket_name;
        struct sockaddr_un unix_addr;
+       size_t query_shm_size = sizeof(*cq);
 
-       assert(query->data && query->size);
-       ret = shm_new(query->size + sizeof(*cq));
+       if (query)
+               query_shm_size += query->size;
+       ret = shm_new(query_shm_size);
        if (ret < 0)
                return ret;
        query_shmid = ret;
@@ -157,9 +160,10 @@ int send_callback_request(callback_function *f, struct osl_object *query,
                goto out;
        cq = query_shm;
        cq->handler = f;
-       cq->query_size = query->size;
+       cq->query_size = query_shm_size - sizeof(*cq);
 
-       memcpy(query_shm + sizeof(*cq), query->data, query->size);
+       if (query)
+               memcpy(query_shm + sizeof(*cq), query->data, query->size);
        ret = shm_detach(query_shm);
        if (ret < 0)
                goto out;
@@ -174,15 +178,13 @@ int send_callback_request(callback_function *f, struct osl_object *query,
        ret = init_unix_addr(&unix_addr, conf.afs_socket_arg);
        if (ret < 0)
                goto out;
-       ret = -E_CONNECT;
-       if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) /* FIXME: Use para_connect() */
+       ret = PARA_CONNECT(fd, &unix_addr);
+       if (ret < 0)
                goto out;
        ret = send_bin_buffer(fd, buf, sizeof(buf));
-       PARA_NOTICE_LOG("bin buffer ret: %d\n", ret);
        if (ret < 0)
                goto out;
        ret = recv_bin_buffer(fd, buf, sizeof(buf));
-       PARA_NOTICE_LOG("ret: %d\n", ret);
        if (ret < 0)
                goto out;
        if (ret != sizeof(int)) {
@@ -190,7 +192,6 @@ int send_callback_request(callback_function *f, struct osl_object *query,
                goto out;
        }
        ret = *(int *) buf;
-       PARA_NOTICE_LOG("result_shmid: %d\n", ret);
        if (ret <= 0)
                goto out;
        result_shmid = ret;
@@ -214,7 +215,7 @@ out:
                PARA_ERROR_LOG("%s\n", "shm destroy error");
        if (fd >= 0)
                close(fd);
-       PARA_DEBUG_LOG("callback_ret: %d\n", ret);
+//     PARA_DEBUG_LOG("callback_ret: %d\n", ret);
        return ret;
 }
 
@@ -235,7 +236,7 @@ out:
  * \sa send_standard_callback_request(), send_callback_request().
  */
 int send_option_arg_callback_request(struct osl_object *options,
-               int argc, const char **argv, callback_function *f,
+               int argc,  char * const * const argv, callback_function *f,
                struct osl_object *result)
 {
        char *p;
@@ -273,12 +274,48 @@ int send_option_arg_callback_request(struct osl_object *options,
  * \return The return value of the underlying call to
  * send_option_arg_callback_request().
  */
-int send_standard_callback_request(int argc, const char **argv,
+int send_standard_callback_request(int argc,  char * const * const argv,
                callback_function *f, struct osl_object *result)
 {
        return send_option_arg_callback_request(NULL, argc, argv, f, result);
 }
 
+static int action_if_pattern_matches(struct osl_row *row, void *data)
+{
+       struct pattern_match_data *pmd = data;
+       struct osl_object name_obj;
+       const char *p, *name;
+       int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
+       const char *pattern_txt = (const char *)pmd->patterns.data;
+
+       if (ret < 0)
+               return ret;
+       name = (char *)name_obj.data;
+       if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
+               return 1;
+       if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
+               return pmd->action(pmd->table, row, name, pmd->data);
+       for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
+                       p += strlen(p) + 1) {
+               ret = fnmatch(p, name, pmd->fnmatch_flags);
+               if (ret == FNM_NOMATCH)
+                       continue;
+               if (ret)
+                       return -E_FNMATCH;
+               return pmd->action(pmd->table, row, name, pmd->data);
+       }
+       return 1;
+}
+
+int for_each_matching_row(struct pattern_match_data *pmd)
+{
+       if (pmd->pm_flags & PM_REVERSE_LOOP)
+               return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
+                       action_if_pattern_matches);
+       return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
+                       action_if_pattern_matches);
+}
+
 /**
  * Compare two osl objects of string type.
  *
@@ -301,82 +338,41 @@ int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
        return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
 }
 
-/**
- * A wrapper for strtol(3).
- *
- * \param str The string to be converted to a long integer.
- * \param result The converted value is stored here.
- *
- * \return Positive on success, -E_ATOL on errors.
- *
- * \sa strtol(3), atoi(3).
- */
-int para_atol(const char *str, long *result)
-{
-       char *endptr;
-       long val;
-       int ret, base = 10;
-
-       errno = 0; /* To distinguish success/failure after call */
-       val = strtol(str, &endptr, base);
-       ret = -E_ATOL;
-       if (errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
-               goto out; /* overflow */
-       if (errno != 0 && val == 0)
-               goto out; /* other error */
-       if (endptr == str)
-               goto out; /* No digits were found */
-       if (*endptr != '\0')
-               goto out; /* Further characters after number */
-       *result = val;
-       ret = 1;
-out:
-       return ret;
-}
-
-
 /*
- * write input from fd to dynamically allocated char array,
- * but maximal max_size byte. Return size.
+ * write input from fd to dynamically allocated buffer,
+ * but maximal max_size byte.
  */
-static int fd2buf(int fd, char **buf, int max_size)
+static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
 {
        const size_t chunk_size = 1024;
-       size_t size = 2048;
-       char *p;
+       size_t size = 2048, received = 0;
        int ret;
+       char *buf = para_malloc(size);
 
-       *buf = para_malloc(size * sizeof(char));
-       p = *buf;
-       while ((ret = read(fd, p, chunk_size)) > 0) {
-               p += ret;
-               if ((p - *buf) + chunk_size >= size) {
-                       char *tmp;
-
+       for (;;) {
+               ret = recv_bin_buffer(fd, buf + received, chunk_size);
+               if (ret <= 0)
+                       break;
+               received += ret;
+               if (received + chunk_size >= size) {
                        size *= 2;
-                       if (size > max_size) {
-                               ret = -E_INPUT_TOO_LARGE;
-                               goto out;
-                       }
-                       tmp = para_realloc(*buf, size);
-                       p = (p - *buf) + tmp;
-                       *buf = tmp;
+                       ret = -E_INPUT_TOO_LARGE;
+                       if (size > max_size)
+                               break;
+                       buf = para_realloc(buf, size);
                }
        }
-       if (ret < 0) {
-               ret = -E_READ;
-               goto out;
-       }
-       ret = p - *buf;
-out:
-       if (ret < 0 && *buf)
-               free(*buf);
+       obj->data = buf;
+       obj->size = received;
+       if (ret < 0)
+               free(buf);
        return ret;
 }
 
 /**
- * Read from stdin, and send the result to the parent process.
+ * Read data from a file descriptor, and send it to the afs process.
  *
+ * \param fd File descriptor to read data from.
  * \param arg_obj Pointer to the arguments to \a f.
  * \param f The callback function.
  * \param max_len Don't read more than that many bytes from stdin.
@@ -384,29 +380,30 @@ out:
  *
  * This function is used by commands that wish to let para_server store
  * arbitrary data specified by the user (for instance the add_blob family of
- * commands). First, at most \a max_len bytes are read from stdin, the result
+ * commands). First, at most \a max_len bytes are read from \a fd, the result
  * is concatenated with the buffer given by \a arg_obj, and the combined buffer
  * is made available to the parent process via shared memory.
  *
  * \return Negative on errors, the return value of the underlying call to
  * send_callback_request() otherwise.
  */
-int stdin_command(struct osl_object *arg_obj, callback_function *f,
+int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
                unsigned max_len, struct osl_object *result)
 {
-       char *stdin_buf;
-       size_t stdin_len;
-       struct osl_object query;
-       int ret = fd2buf(STDIN_FILENO, &stdin_buf, max_len);
+       struct osl_object query, stdin_obj;
+       int ret;
 
+       ret = send_buffer(fd, AWAITING_DATA_MSG);
+       if (ret < 0)
+               return ret;
+       ret = fd2buf(fd, max_len, &stdin_obj);
        if (ret < 0)
                return ret;
-       stdin_len = ret;
-       query.size = arg_obj->size + stdin_len;
+       query.size = arg_obj->size + stdin_obj.size;
        query.data = para_malloc(query.size);
        memcpy(query.data, arg_obj->data, arg_obj->size);
-       memcpy((char *)query.data + arg_obj->size, stdin_buf, stdin_len);
-       free(stdin_buf);
+       memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
+       free(stdin_obj.data);
        ret = send_callback_request(f, &query, result);
        free(query.data);
        return ret;
@@ -483,7 +480,7 @@ static enum play_mode init_admissible_files(void)
        given_playlist = "given_playlist";
 
        if (given_mood) {
-               ret = mood_open(given_mood);
+               ret = change_current_mood(given_mood);
                if (ret >= 0) {
                        if (given_playlist)
                                PARA_WARNING_LOG("ignoring playlist %s\n",
@@ -496,10 +493,10 @@ static enum play_mode init_admissible_files(void)
                if (ret >= 0)
                        return PLAY_MODE_PLAYLIST;
        }
-       ret = mood_open(NULL); /* open first available mood */
+       ret = change_current_mood(NULL); /* open first available mood */
        if (ret >= 0)
                return PLAY_MODE_MOOD;
-       mood_open(""); /* open dummy mood, always successful */
+       change_current_mood(""); /* open dummy mood, always successful */
        return PLAY_MODE_MOOD;
 }
 
@@ -512,8 +509,10 @@ static int setup_command_socket_or_die(void)
        unlink(socket_name);
        ret = create_local_socket(socket_name, &unix_addr,
                S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
-       if (ret < 0)
+       if (ret < 0) {
+               PARA_EMERG_LOG("%s: %s\n", PARA_STRERROR(-ret), socket_name);
                exit(EXIT_FAILURE);
+       }
        if (listen(ret , 5) < 0) {
                PARA_EMERG_LOG("%s", "can not listen on socket\n");
                exit(EXIT_FAILURE);
@@ -524,19 +523,21 @@ static int setup_command_socket_or_die(void)
 }
 
 static int server_socket;
+static struct command_task command_task_struct;
+static struct signal_task signal_task_struct;
 
-void loop(void)
+static void unregister_tasks(void)
 {
-       for (;;)
-               sleep(1);
+       unregister_task(&command_task_struct.task);
+       unregister_task(&signal_task_struct.task);
 }
 
-static void afs_shutdown(enum osl_close_flags flags)
+static void close_afs_tables(enum osl_close_flags flags)
 {
-       PARA_NOTICE_LOG("cleaning up\n");
+       PARA_NOTICE_LOG("closing afs_tables\n");
        score_shutdown(flags);
        attribute_shutdown(flags);
-       mood_close();
+       close_current_mood();
        playlist_close();
        moods_shutdown(flags);
        playlists_shutdown(flags);
@@ -559,17 +560,16 @@ static void signal_post_select(struct sched *s, struct task *t)
        if (!FD_ISSET(st->fd, &s->rfds))
                return;
        st->signum = para_next_signal();
-       PARA_NOTICE_LOG("caught signal %d\n", st->signum);
        t->ret = 1;
        if (st->signum == SIGUSR1)
                return; /* ignore SIGUSR1 */
-       afs_shutdown(OSL_MARK_CLEAN);
+       PARA_NOTICE_LOG("caught signal %d\n", st->signum);
        t->ret = -E_SIGNAL_CAUGHT;
+       unregister_tasks();
 }
 
 static void register_signal_task(void)
 {
-       static struct signal_task signal_task_struct;
        struct signal_task *st = &signal_task_struct;
        st->fd = para_signal_init();
        PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
@@ -584,11 +584,23 @@ static void register_signal_task(void)
        register_task(&st->task);
 }
 
+static struct list_head afs_client_list;
+
+struct afs_client {
+       struct list_head node;
+       int fd;
+       struct timeval connect_time;
+};
+
 static void command_pre_select(struct sched *s, struct task *t)
 {
        struct command_task *ct = t->private_data;
-       t->ret = 1;
+       struct afs_client *client;
+
        para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
+       list_for_each_entry(client, &afs_client_list, node)
+               para_fd_set(client->fd, &s->rfds, &s->max_fileno);
+       t->ret = 1;
 }
 
 /*
@@ -646,66 +658,79 @@ out:
        return ret;
 }
 
-static void command_post_select(struct sched *s, struct task *t)
+static void execute_afs_command(int fd, uint32_t expected_cookie)
 {
-       struct command_task *ct = t->private_data;
-       struct sockaddr_un unix_addr;
-       char buf[sizeof(uint32_t) + sizeof(int)];
        uint32_t cookie;
-       int query_shmid, fd;
+       int query_shmid;
+       char buf[sizeof(cookie) + sizeof(query_shmid)];
+       int ret = recv_bin_buffer(fd, buf, sizeof(buf));
 
-       t->ret = 1;
-       if (!FD_ISSET(ct->fd, &s->rfds))
-               return;
-       t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
-       if (t->ret < 0)
+       if (ret < 0) {
+               PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
                return;
-       /*
-        * The following errors may be caused by a malicious local user. So do
-        * not return an error in this case as this would terminate  para_afs
-        * and para_server.
-        */
-       fd = t->ret;
-       /* FIXME: This is easily dosable (peer doesn't send data) */
-       t->ret = recv_bin_buffer(fd, buf, sizeof(buf));
-       if (t->ret < 0) {
-               PARA_NOTICE_LOG("%s (%d)\n", PARA_STRERROR(-t->ret), t->ret);
-               t->ret = 1;
-               goto out;
        }
-       if (t->ret != sizeof(buf)) {
-               PARA_NOTICE_LOG("short read (%d bytes, expected %d)\n",
-                       t->ret, sizeof(buf));
-               t->ret = 1;
-               goto out;
+       if (ret != sizeof(buf)) {
+               PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
+                       ret, (long unsigned) sizeof(buf));
+               return;
        }
        cookie = *(uint32_t *)buf;
-       if (cookie != ct->cookie) {
+       if (cookie != expected_cookie) {
                PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
-                       (unsigned)cookie, (unsigned)ct->cookie);
-               t->ret = 1;
-               goto out;
+                       (unsigned)cookie, (unsigned)expected_cookie);
+               return;
        }
        query_shmid = *(int *)(buf + sizeof(cookie));
        if (query_shmid < 0) {
                PARA_WARNING_LOG("received invalid query shmid %d)\n",
                        query_shmid);
-               t->ret = 1;
-               goto out;
+               return;
        }
-       t->ret = call_callback(fd, query_shmid);
+       /* Ignore return value: Errors might be ok here. */
+       call_callback(fd, query_shmid);
+}
+
+#define AFS_CLIENT_TIMEOUT 3
+
+static void command_post_select(struct sched *s, struct task *t)
+{
+       struct command_task *ct = t->private_data;
+       struct sockaddr_un unix_addr;
+       struct afs_client *client, *tmp;
+
+       /* First, check the list of connected clients. */
+       list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
+               if (FD_ISSET(client->fd, &s->rfds))
+                       execute_afs_command(client->fd, ct->cookie);
+               else { /* prevent bogus connection flodding */
+                       struct timeval diff;
+                       tv_diff(now, &client->connect_time, &diff);
+                       if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
+                               continue;
+                       PARA_WARNING_LOG("connection timeout\n");
+               }
+               close(client->fd);
+               list_del(&client->node);
+               free(client);
+       }
+       /* Next, accept connections on the local socket. */
+       if (!FD_ISSET(ct->fd, &s->rfds))
+               goto out;
+       t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
        if (t->ret < 0) {
                PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
-               t->ret = 1;
                goto out;
        }
+       client = para_malloc(sizeof(*client));
+       client->fd = t->ret;
+       client->connect_time = *now;
+       para_list_add(&client->node, &afs_client_list);
 out:
-       close(fd);
+       t->ret = 1;
 }
 
 static void register_command_task(uint32_t cookie)
 {
-       static struct command_task command_task_struct;
        struct command_task *ct = &command_task_struct;
        ct->fd = setup_command_socket_or_die();
        ct->cookie = cookie;
@@ -723,43 +748,59 @@ void register_tasks(uint32_t cookie)
        register_command_task(cookie);
 }
 
-__noreturn int afs_init(uint32_t cookie, int socket_fd)
+static char *database_dir;
+
+static int make_database_dir(void)
 {
        int ret;
-       enum play_mode current_play_mode;
-       struct sched s;
 
-       server_socket = socket_fd;
-       PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
-               server_socket, (unsigned) cookie);
+       if (!database_dir) {
+               if (conf.afs_database_dir_given)
+                       database_dir = para_strdup(conf.afs_database_dir_arg);
+               else {
+                       char *home = para_homedir();
+                       database_dir = make_message(
+                               "%s/.paraslash/afs_database", home);
+                       free(home);
+               }
+       }
+       PARA_INFO_LOG("afs_database dir %s\n", database_dir);
+       ret = para_mkdir(database_dir, 0777);
+       if (ret >= 0 || ret == -E_EXIST)
+               return 1;
+       free(database_dir);
+       database_dir = NULL;
+       return ret;
+}
+
+static int open_afs_tables(void)
+{
+       int ret = make_database_dir();
 
-       ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES]);
        if (ret < 0)
-               goto attribute_init_error;
-       ret = moods_init(&afs_tables[TBLNUM_MOODS]);
+               return ret;
+       ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES], database_dir);
+       if (ret < 0)
+               return ret;
+       ret = moods_init(&afs_tables[TBLNUM_MOODS], database_dir);
        if (ret < 0)
                goto moods_init_error;
-       ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST]);
+       ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST], database_dir);
        if (ret < 0)
                goto playlists_init_error;
-       ret = lyrics_init(&afs_tables[TBLNUM_LYRICS]);
+       ret = lyrics_init(&afs_tables[TBLNUM_LYRICS], database_dir);
        if (ret < 0)
                goto lyrics_init_error;
-       ret = images_init(&afs_tables[TBLNUM_IMAGES]);
+       ret = images_init(&afs_tables[TBLNUM_IMAGES], database_dir);
        if (ret < 0)
                goto images_init_error;
-       ret = score_init(&afs_tables[TBLNUM_SCORES]);
+       ret = score_init(&afs_tables[TBLNUM_SCORES], database_dir);
        if (ret < 0)
                goto score_init_error;
-       ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES]);
+       ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES], database_dir);
        if (ret < 0)
                goto aft_init_error;
-
-       current_play_mode = init_admissible_files();
-       register_tasks(cookie);
-       s.default_timeout.tv_sec = 0;
-       s.default_timeout.tv_usec = 99 * 1000;
-       sched(&s);
+       return 1;
 
 aft_init_error:
        score_shutdown(OSL_MARK_CLEAN);
@@ -773,48 +814,161 @@ playlists_init_error:
        moods_shutdown(OSL_MARK_CLEAN);
 moods_init_error:
        attribute_shutdown(OSL_MARK_CLEAN);
-attribute_init_error:
+       return ret;
+}
+
+__noreturn int afs_init(uint32_t cookie, int socket_fd)
+{
+       enum play_mode current_play_mode;
+       struct sched s;
+       int ret;
+
+       INIT_LIST_HEAD(&afs_client_list);
+       ret = open_afs_tables();
+
+       if (ret < 0) {
+               PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
+               exit(EXIT_FAILURE);
+       }
+       server_socket = socket_fd;
+       ret = mark_fd_nonblock(server_socket);
+       if (ret < 0)
+               exit(EXIT_FAILURE);
+       PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
+               server_socket, (unsigned) cookie);
+       current_play_mode = init_admissible_files();
+       register_tasks(cookie);
+       s.default_timeout.tv_sec = 0;
+       s.default_timeout.tv_usec = 99 * 1000;
+       ret = sched(&s);
+       if (ret < 0)
+               PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
+       close_afs_tables(OSL_MARK_CLEAN);
        exit(EXIT_FAILURE);
 }
 
-static int create_all_tables(void)
+static int create_tables_callback(const struct osl_object *query,
+               __a_unused struct osl_object *result)
 {
+       uint32_t table_mask = *(uint32_t *)query->data;
        int i, ret;
 
+       close_afs_tables(OSL_MARK_CLEAN);
        for (i = 0; i < NUM_AFS_TABLES; i++) {
                struct table_info *ti = afs_tables + i;
 
                if (ti->flags & TBLFLAG_SKIP_CREATE)
                        continue;
+               if (!(table_mask & (1 << i)))
+                       continue;
                ret = osl_create_table(ti->desc);
                if (ret < 0)
                        return ret;
        }
-       return 1;
+       ret = open_afs_tables();
+       return ret < 0? ret: 0;
 }
 
-/* TODO load tables after init */
-int com_init(__a_unused int fd, int argc, const char **argv)
+int com_init(int fd, int argc, char * const * const argv)
 {
        int i, j, ret;
-       if (argc == 1)
-               return create_all_tables();
-       for (i = 1; i < argc; i++) {
-               for (j = 0; j < NUM_AFS_TABLES; j++) {
-                       struct table_info *ti = afs_tables + j;
+       uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
+       struct osl_object query = {.data = &table_mask,
+               .size = sizeof(table_mask)};
+
+       if (argc != 1) {
+               table_mask = 0;
+               for (i = 1; i < argc; i++) {
+                       for (j = 0; j < NUM_AFS_TABLES; j++) {
+                               struct table_info *ti = afs_tables + j;
+
+                               if (ti->flags & TBLFLAG_SKIP_CREATE)
+                                       continue;
+                               if (strcmp(argv[i], ti->desc->name))
+                                       continue;
+                               table_mask |= (1 << j);
+                               break;
+                       }
+                       if (j == NUM_AFS_TABLES)
+                               return -E_BAD_TABLE_NAME;
+               }
+       }
+       ret = send_callback_request(create_tables_callback, &query, NULL);
+       if (ret < 0)
+               return ret;
+       return send_va_buffer(fd, "successfully created afs table(s)\n");
+}
 
-                       if (ti->flags & TBLFLAG_SKIP_CREATE)
-                               continue;
-                       if (strcmp(argv[i], ti->desc->name))
-                               continue;
-                       PARA_NOTICE_LOG("creating table %s\n", argv[i]);
-                       ret = osl_create_table(ti->desc);
+enum com_check_flags {
+       CHECK_AFT = 1,
+       CHECK_MOODS = 2,
+       CHECK_PLAYLISTS = 4
+};
+
+int com_check(int fd, int argc, char * const * const argv)
+{
+       unsigned flags = 0;
+       int i, ret;
+       struct osl_object result;
+
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+               if (arg[0] != '-')
+                       break;
+               if (!strcmp(arg, "--")) {
+                       i++;
+                       break;
+               }
+               if (!strcmp(arg, "-a")) {
+                       flags |= CHECK_AFT;
+                       continue;
+               }
+               if (!strcmp(arg, "-p")) {
+                       flags |= CHECK_PLAYLISTS;
+                       continue;
+               }
+               if (!strcmp(arg, "-m")) {
+                       flags |= CHECK_MOODS;
+                       continue;
+               }
+               return -E_AFS_SYNTAX;
+       }
+       if (i < argc)
+               return -E_AFS_SYNTAX;
+       if (!flags)
+               flags = ~0U;
+       if (flags & CHECK_AFT) {
+               ret = send_callback_request(aft_check_callback, NULL, &result);
+               if (ret < 0)
+                       return ret;
+               if (ret > 0) {
+                       ret = send_buffer(fd, (char *) result.data);
+                       free(result.data);
+                       if (ret < 0)
+                               return ret;
+               }
+       }
+       if (flags & CHECK_PLAYLISTS) {
+               ret = send_callback_request(playlist_check_callback, NULL, &result);
+               if (ret < 0)
+                       return ret;
+               if (ret > 0) {
+                       ret = send_buffer(fd, (char *) result.data);
+                       free(result.data);
+                       if (ret < 0)
+                               return ret;
+               }
+       }
+       if (flags & CHECK_MOODS) {
+               ret = send_callback_request(mood_check_callback, NULL, &result);
+               if (ret < 0)
+                       return ret;
+               if (ret > 0) {
+                       ret = send_buffer(fd, (char *) result.data);
+                       free(result.data);
                        if (ret < 0)
                                return ret;
-                       break;
                }
-               if (j == NUM_AFS_TABLES)
-                       return -E_BAD_TABLE_NAME;
        }
        return 1;
 }