d15e1e09a2
This saves one level of indent.
798 lines
20 KiB
C
798 lines
20 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "client.h"
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#include "command.h"
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#include "conf.h"
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#include "log.h"
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#include "listen.h"
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#include "permission.h"
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#include "sllist.h"
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#include "utils.h"
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#include "ioops.h"
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#include "myfprintf.h"
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#include "os_compat.h"
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#include "main_notify.h"
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#include "../config.h"
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#define GREETING "OK MPD " PROTOCOL_VERSION "\n"
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#define CLIENT_MAX_BUFFER_LENGTH (40960)
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#define CLIENT_LIST_MODE_BEGIN "command_list_begin"
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#define CLIENT_LIST_OK_MODE_BEGIN "command_list_ok_begin"
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#define CLIENT_LIST_MODE_END "command_list_end"
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#define CLIENT_DEFAULT_OUT_BUFFER_SIZE (4096)
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#define CLIENT_TIMEOUT_DEFAULT (60)
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#define CLIENT_MAX_CONNECTIONS_DEFAULT (10)
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#define CLIENT_MAX_COMMAND_LIST_DEFAULT (2048*1024)
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#define CLIENT_MAX_OUTPUT_BUFFER_SIZE_DEFAULT (8192*1024)
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/* set this to zero to indicate we have no possible clients */
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static unsigned int client_max_connections; /*CLIENT_MAX_CONNECTIONS_DEFAULT; */
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static int client_timeout = CLIENT_TIMEOUT_DEFAULT;
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static size_t client_max_command_list_size =
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CLIENT_MAX_COMMAND_LIST_DEFAULT;
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static size_t client_max_output_buffer_size =
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CLIENT_MAX_OUTPUT_BUFFER_SIZE_DEFAULT;
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/* maybe make conf option for this, or... 32 might be good enough */
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static long int client_list_cache_size = 32;
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/* shared globally between all clients: */
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static struct strnode *list_cache;
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static struct strnode *list_cache_head;
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static struct strnode *list_cache_tail;
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struct client {
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char buffer[CLIENT_MAX_BUFFER_LENGTH];
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size_t bufferLength;
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size_t bufferPos;
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int fd; /* file descriptor */
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int permission;
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time_t lastTime;
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struct strnode *cmd_list; /* for when in list mode */
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struct strnode *cmd_list_tail; /* for when in list mode */
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int cmd_list_OK; /* print OK after each command execution */
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size_t cmd_list_size; /* mem cmd_list consumes */
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int cmd_list_dup; /* has the cmd_list been copied to private space? */
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struct sllnode *deferred_send; /* for output if client is slow */
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size_t deferred_bytes; /* mem deferred_send consumes */
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int expired; /* set whether this client should be closed on next
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check of old clients */
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unsigned int num; /* client number */
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char *send_buf;
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size_t send_buf_used; /* bytes used this instance */
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size_t send_buf_size; /* bytes usable this instance */
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size_t send_buf_alloc; /* bytes actually allocated */
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};
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static struct client *clients;
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static void client_write_deferred(struct client *client);
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static void client_write_output(struct client *client);
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#ifdef SO_SNDBUF
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static size_t get_default_snd_buf_size(struct client *client)
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{
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int new_size;
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socklen_t sockOptLen = sizeof(int);
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if (getsockopt(client->fd, SOL_SOCKET, SO_SNDBUF,
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(char *)&new_size, &sockOptLen) < 0) {
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DEBUG("problem getting sockets send buffer size\n");
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return CLIENT_DEFAULT_OUT_BUFFER_SIZE;
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}
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if (new_size > 0)
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return (size_t)new_size;
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DEBUG("sockets send buffer size is not positive\n");
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return CLIENT_DEFAULT_OUT_BUFFER_SIZE;
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}
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#else /* !SO_SNDBUF */
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static size_t get_default_snd_buf_size(struct client *client)
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{
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return CLIENT_DEFAULT_OUT_BUFFER_SIZE;
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}
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#endif /* !SO_SNDBUF */
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static void set_send_buf_size(struct client *client)
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{
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size_t new_size = get_default_snd_buf_size(client);
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if (client->send_buf_size != new_size) {
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client->send_buf_size = new_size;
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/* don't resize to get smaller, only bigger */
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if (client->send_buf_alloc < new_size) {
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if (client->send_buf)
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free(client->send_buf);
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client->send_buf = xmalloc(new_size);
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client->send_buf_alloc = new_size;
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}
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}
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}
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static void client_init(struct client *client, int fd)
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{
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assert(client->fd < 0);
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client->cmd_list_size = 0;
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client->cmd_list_dup = 0;
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client->cmd_list_OK = -1;
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client->bufferLength = 0;
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client->bufferPos = 0;
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client->fd = fd;
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set_nonblocking(fd);
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client->lastTime = time(NULL);
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client->cmd_list = NULL;
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client->cmd_list_tail = NULL;
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client->deferred_send = NULL;
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client->expired = 0;
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client->deferred_bytes = 0;
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client->send_buf_used = 0;
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client->permission = getDefaultPermissions();
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set_send_buf_size(client);
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xwrite(fd, GREETING, strlen(GREETING));
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}
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static void free_cmd_list(struct strnode *list)
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{
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struct strnode *tmp = list;
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while (tmp) {
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struct strnode *next = tmp->next;
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if (tmp >= list_cache_head && tmp <= list_cache_tail) {
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/* inside list_cache[] array */
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tmp->data = NULL;
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tmp->next = NULL;
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} else
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free(tmp);
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tmp = next;
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}
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}
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static void cmd_list_clone(struct client *client)
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{
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struct strnode *new = dup_strlist(client->cmd_list);
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free_cmd_list(client->cmd_list);
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client->cmd_list = new;
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client->cmd_list_dup = 1;
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/* new tail */
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while (new && new->next)
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new = new->next;
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client->cmd_list_tail = new;
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}
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static void new_cmd_list_ptr(struct client *client, char *s, const int size)
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{
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int i;
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struct strnode *new;
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if (!client->cmd_list_dup) {
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for (i = client_list_cache_size - 1; i >= 0; --i) {
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if (list_cache[i].data)
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continue;
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new = &(list_cache[i]);
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new->data = s;
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/* implied in free_cmd_list() and init: */
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/* last->next->next = NULL; */
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goto out;
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}
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}
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/* allocate from the heap */
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new = client->cmd_list_dup ? new_strnode_dup(s, size)
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: new_strnode(s);
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out:
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if (client->cmd_list) {
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client->cmd_list_tail->next = new;
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client->cmd_list_tail = new;
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} else
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client->cmd_list = client->cmd_list_tail = new;
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}
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static void client_close(struct client *client)
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{
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struct sllnode *buf;
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if (client->fd < 0)
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return;
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xclose(client->fd);
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client->fd = -1;
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if (client->cmd_list) {
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free_cmd_list(client->cmd_list);
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client->cmd_list = NULL;
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}
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if ((buf = client->deferred_send)) {
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do {
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struct sllnode *prev = buf;
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buf = buf->next;
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free(prev);
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} while (buf);
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client->deferred_send = NULL;
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}
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SECURE("client %i: closed\n", client->num);
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}
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void client_new(int fd, const struct sockaddr *addr)
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{
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unsigned int i;
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const char *hostname;
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for (i = 0; i < client_max_connections
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&& clients[i].fd >= 0; i++) /* nothing */ ;
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if (i == client_max_connections) {
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ERROR("Max Connections Reached!\n");
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xclose(fd);
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return;
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}
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switch (addr->sa_family) {
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#ifdef HAVE_TCP
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case AF_INET:
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hostname = (const char *)inet_ntoa(((const struct sockaddr_in *)
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addr)->sin_addr);
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if (!hostname)
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hostname = "error getting ipv4 address";
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break;
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#ifdef HAVE_IPV6
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case AF_INET6:
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{
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static char host[INET6_ADDRSTRLEN + 1];
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memset(host, 0, INET6_ADDRSTRLEN + 1);
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if (inet_ntop(AF_INET6, (const void *)
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&(((const struct sockaddr_in6 *)addr)->
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sin6_addr), host,
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INET6_ADDRSTRLEN)) {
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hostname = (const char *)host;
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} else {
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hostname = "error getting ipv6 address";
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}
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}
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break;
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#endif
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#endif /* HAVE_TCP */
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#ifdef HAVE_UN
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case AF_UNIX:
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hostname = "local connection";
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break;
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#endif /* HAVE_UN */
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default:
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hostname = "unknown";
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}
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SECURE("client %i: opened from %s\n", i, hostname);
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client_init(&(clients[i]), fd);
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}
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static int client_process_line(struct client *client)
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{
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int ret = 1;
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char *line = client->buffer + client->bufferPos;
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if (client->cmd_list_OK >= 0) {
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if (strcmp(line, CLIENT_LIST_MODE_END) == 0) {
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DEBUG("client %i: process command "
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"list\n", client->num);
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ret = processListOfCommands(client->fd,
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&(client->permission),
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&(client->expired),
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client->cmd_list_OK,
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client->cmd_list);
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DEBUG("client %i: process command "
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"list returned %i\n", client->num, ret);
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if (ret == 0)
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commandSuccess(client->fd);
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else if (ret == COMMAND_RETURN_CLOSE
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|| client->expired)
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client_close(client);
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client_write_output(client);
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free_cmd_list(client->cmd_list);
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client->cmd_list = NULL;
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client->cmd_list_OK = -1;
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} else {
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size_t len = strlen(line) + 1;
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client->cmd_list_size += len;
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if (client->cmd_list_size >
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client_max_command_list_size) {
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ERROR("client %i: command "
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"list size (%lu) is "
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"larger than the max "
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"(%lu)\n",
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client->num,
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(unsigned long)client->cmd_list_size,
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(unsigned long)
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client_max_command_list_size);
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client_close(client);
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ret = COMMAND_RETURN_CLOSE;
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} else
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new_cmd_list_ptr(client, line, len);
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}
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} else {
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if (strcmp(line, CLIENT_LIST_MODE_BEGIN) == 0) {
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client->cmd_list_OK = 0;
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ret = 1;
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} else if (strcmp(line, CLIENT_LIST_OK_MODE_BEGIN) == 0) {
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client->cmd_list_OK = 1;
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ret = 1;
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} else {
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DEBUG("client %i: process command \"%s\"\n",
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client->num, line);
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ret = processCommand(client->fd,
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&(client->permission), line);
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DEBUG("client %i: command returned %i\n",
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client->num, ret);
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if (ret == 0)
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commandSuccess(client->fd);
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else if (ret == COMMAND_RETURN_CLOSE
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|| client->expired) {
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client_close(client);
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}
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client_write_output(client);
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}
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}
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return ret;
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}
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static int client_input_received(struct client *client, int bytesRead)
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{
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int ret = 0;
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char *buf_tail = &(client->buffer[client->bufferLength - 1]);
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while (bytesRead > 0) {
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client->bufferLength++;
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bytesRead--;
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buf_tail++;
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if (*buf_tail == '\n') {
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*buf_tail = '\0';
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if (client->bufferLength > client->bufferPos) {
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if (*(buf_tail - 1) == '\r')
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*(buf_tail - 1) = '\0';
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}
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ret = client_process_line(client);
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if (client->expired)
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return ret;
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client->bufferPos = client->bufferLength;
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}
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if (client->bufferLength == CLIENT_MAX_BUFFER_LENGTH) {
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if (client->bufferPos == 0) {
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ERROR("client %i: buffer overflow\n",
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client->num);
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client_close(client);
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return 1;
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}
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if (client->cmd_list_OK >= 0 &&
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client->cmd_list &&
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!client->cmd_list_dup)
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cmd_list_clone(client);
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assert(client->bufferLength >= client->bufferPos
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&& "bufferLength >= bufferPos");
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client->bufferLength -= client->bufferPos;
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memmove(client->buffer,
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client->buffer + client->bufferPos,
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client->bufferLength);
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client->bufferPos = 0;
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}
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if (ret == COMMAND_RETURN_KILL || ret == COMMAND_RETURN_CLOSE) {
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return ret;
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}
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}
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return ret;
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}
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static int client_read(struct client *client)
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{
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int bytesRead;
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bytesRead = read(client->fd,
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client->buffer + client->bufferLength,
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CLIENT_MAX_BUFFER_LENGTH - client->bufferLength);
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if (bytesRead > 0)
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return client_input_received(client, bytesRead);
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else if (bytesRead == 0 || (bytesRead < 0 && errno != EINTR)) {
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client_close(client);
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} else
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return 0;
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return 1;
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}
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static void client_manager_register_read_fd(fd_set * fds, int *fdmax)
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{
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unsigned int i;
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FD_ZERO(fds);
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addListenSocketsToFdSet(fds, fdmax);
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for (i = 0; i < client_max_connections; i++) {
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if (clients[i].fd >= 0 && !clients[i].expired
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&& !clients[i].deferred_send) {
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FD_SET(clients[i].fd, fds);
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if (*fdmax < clients[i].fd)
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*fdmax = clients[i].fd;
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}
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}
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}
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static void client_manager_register_write_fd(fd_set * fds, int *fdmax)
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{
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unsigned int i;
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FD_ZERO(fds);
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for (i = 0; i < client_max_connections; i++) {
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if (clients[i].fd >= 0 && !clients[i].expired
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&& clients[i].deferred_send) {
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FD_SET(clients[i].fd, fds);
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if (*fdmax < clients[i].fd)
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*fdmax = clients[i].fd;
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}
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}
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}
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static void closeNextErroredInterface(void)
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{
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fd_set fds;
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struct timeval tv;
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unsigned int i;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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for (i = 0; i < client_max_connections; i++) {
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if (clients[i].fd >= 0) {
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FD_ZERO(&fds);
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FD_SET(clients[i].fd, &fds);
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if (select(clients[i].fd + 1,
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&fds, NULL, NULL, &tv) < 0) {
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client_close(&clients[i]);
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return;
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}
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}
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}
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}
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int client_manager_io(void)
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{
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fd_set rfds;
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fd_set wfds;
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fd_set efds;
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unsigned int i;
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int selret;
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int fdmax;
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while (1) {
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fdmax = 0;
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FD_ZERO( &efds );
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client_manager_register_read_fd(&rfds, &fdmax);
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client_manager_register_write_fd(&wfds, &fdmax);
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registered_IO_add_fds(&fdmax, &rfds, &wfds, &efds);
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main_notify_lock();
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selret = select(fdmax + 1, &rfds, &wfds, &efds, NULL);
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main_notify_unlock();
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if (selret < 0 && errno == EINTR)
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break;
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registered_IO_consume_fds(&selret, &rfds, &wfds, &efds);
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if (selret == 0)
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break;
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if (selret < 0) {
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closeNextErroredInterface();
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continue;
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}
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getConnections(&rfds);
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for (i = 0; i < client_max_connections; i++) {
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if (clients[i].fd >= 0
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&& FD_ISSET(clients[i].fd, &rfds)) {
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if (COMMAND_RETURN_KILL ==
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client_read(&(clients[i]))) {
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return COMMAND_RETURN_KILL;
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}
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clients[i].lastTime = time(NULL);
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}
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if (clients[i].fd >= 0
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&& FD_ISSET(clients[i].fd, &wfds)) {
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client_write_deferred(&clients[i]);
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clients[i].lastTime = time(NULL);
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}
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}
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|
break;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void client_manager_init(void)
|
|
{
|
|
unsigned int i;
|
|
char *test;
|
|
ConfigParam *param;
|
|
|
|
param = getConfigParam(CONF_CONN_TIMEOUT);
|
|
|
|
if (param) {
|
|
client_timeout = strtol(param->value, &test, 10);
|
|
if (*test != '\0' || client_timeout <= 0) {
|
|
FATAL("connection timeout \"%s\" is not a positive "
|
|
"integer, line %i\n", CONF_CONN_TIMEOUT,
|
|
param->line);
|
|
}
|
|
}
|
|
|
|
param = getConfigParam(CONF_MAX_CONN);
|
|
|
|
if (param) {
|
|
client_max_connections = strtol(param->value, &test, 10);
|
|
if (*test != '\0' || client_max_connections <= 0) {
|
|
FATAL("max connections \"%s\" is not a positive integer"
|
|
", line %i\n", param->value, param->line);
|
|
}
|
|
} else
|
|
client_max_connections = CLIENT_MAX_CONNECTIONS_DEFAULT;
|
|
|
|
param = getConfigParam(CONF_MAX_COMMAND_LIST_SIZE);
|
|
|
|
if (param) {
|
|
long tmp = strtol(param->value, &test, 10);
|
|
if (*test != '\0' || tmp <= 0) {
|
|
FATAL("max command list size \"%s\" is not a positive "
|
|
"integer, line %i\n", param->value, param->line);
|
|
}
|
|
client_max_command_list_size = tmp * 1024;
|
|
}
|
|
|
|
param = getConfigParam(CONF_MAX_OUTPUT_BUFFER_SIZE);
|
|
|
|
if (param) {
|
|
long tmp = strtol(param->value, &test, 10);
|
|
if (*test != '\0' || tmp <= 0) {
|
|
FATAL("max output buffer size \"%s\" is not a positive "
|
|
"integer, line %i\n", param->value, param->line);
|
|
}
|
|
client_max_output_buffer_size = tmp * 1024;
|
|
}
|
|
|
|
clients = xmalloc(sizeof(clients[0]) * client_max_connections);
|
|
|
|
list_cache = xcalloc(client_list_cache_size, sizeof(struct strnode));
|
|
list_cache_head = &(list_cache[0]);
|
|
list_cache_tail = &(list_cache[client_list_cache_size - 1]);
|
|
|
|
for (i = 0; i < client_max_connections; i++) {
|
|
clients[i].fd = -1;
|
|
clients[i].send_buf = NULL;
|
|
clients[i].send_buf_size = 0;
|
|
clients[i].send_buf_alloc = 0;
|
|
clients[i].num = i;
|
|
}
|
|
}
|
|
|
|
static void client_close_all(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < client_max_connections; i++) {
|
|
if (clients[i].fd >= 0)
|
|
client_close(&(clients[i]));
|
|
if (clients[i].send_buf)
|
|
free(clients[i].send_buf);
|
|
}
|
|
free(list_cache);
|
|
}
|
|
|
|
void client_manager_deinit(void)
|
|
{
|
|
client_close_all();
|
|
|
|
free(clients);
|
|
|
|
client_max_connections = 0;
|
|
}
|
|
|
|
void client_manager_expire(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < client_max_connections; i++) {
|
|
if (clients[i].fd >= 0) {
|
|
if (clients[i].expired) {
|
|
DEBUG("client %i: expired\n", i);
|
|
client_close(&(clients[i]));
|
|
} else if (time(NULL) - clients[i].lastTime >
|
|
client_timeout) {
|
|
DEBUG("client %i: timeout\n", i);
|
|
client_close(&(clients[i]));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void client_write_deferred(struct client *client)
|
|
{
|
|
struct sllnode *buf;
|
|
ssize_t ret = 0;
|
|
|
|
buf = client->deferred_send;
|
|
while (buf) {
|
|
ret = write(client->fd, buf->data, buf->size);
|
|
if (ret < 0)
|
|
break;
|
|
else if ((size_t)ret < buf->size) {
|
|
assert(client->deferred_bytes >= (size_t)ret);
|
|
client->deferred_bytes -= ret;
|
|
buf->data = (char *)buf->data + ret;
|
|
buf->size -= ret;
|
|
} else {
|
|
struct sllnode *tmp = buf;
|
|
size_t decr = (buf->size + sizeof(struct sllnode));
|
|
|
|
assert(client->deferred_bytes >= decr);
|
|
client->deferred_bytes -= decr;
|
|
buf = buf->next;
|
|
free(tmp);
|
|
client->deferred_send = buf;
|
|
}
|
|
client->lastTime = time(NULL);
|
|
}
|
|
|
|
if (!client->deferred_send) {
|
|
DEBUG("client %i: buffer empty %lu\n", client->num,
|
|
(unsigned long)client->deferred_bytes);
|
|
assert(client->deferred_bytes == 0);
|
|
} else if (ret < 0 && errno != EAGAIN && errno != EINTR) {
|
|
/* cause client to close */
|
|
DEBUG("client %i: problems flushing buffer\n",
|
|
client->num);
|
|
buf = client->deferred_send;
|
|
do {
|
|
struct sllnode *prev = buf;
|
|
buf = buf->next;
|
|
free(prev);
|
|
} while (buf);
|
|
client->deferred_send = NULL;
|
|
client->deferred_bytes = 0;
|
|
client->expired = 1;
|
|
}
|
|
}
|
|
|
|
int client_print(int fd, const char *buffer, size_t buflen)
|
|
{
|
|
static unsigned int i;
|
|
size_t copylen;
|
|
struct client *client;
|
|
|
|
assert(fd >= 0);
|
|
|
|
if (i >= client_max_connections ||
|
|
clients[i].fd < 0 || clients[i].fd != fd) {
|
|
for (i = 0; i < client_max_connections; i++) {
|
|
if (clients[i].fd == fd)
|
|
break;
|
|
}
|
|
if (i == client_max_connections)
|
|
return -1;
|
|
}
|
|
|
|
/* if fd isn't found or client is going to be closed, do nothing */
|
|
if (clients[i].expired)
|
|
return 0;
|
|
|
|
client = clients + i;
|
|
|
|
while (buflen > 0 && !client->expired) {
|
|
size_t left;
|
|
|
|
assert(client->send_buf_size >= client->send_buf_used);
|
|
left = client->send_buf_size - client->send_buf_used;
|
|
|
|
copylen = buflen > left ? left : buflen;
|
|
memcpy(client->send_buf + client->send_buf_used, buffer,
|
|
copylen);
|
|
buflen -= copylen;
|
|
client->send_buf_used += copylen;
|
|
buffer += copylen;
|
|
if (client->send_buf_used >= client->send_buf_size)
|
|
client_write_output(client);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void client_write_output(struct client *client)
|
|
{
|
|
ssize_t ret;
|
|
struct sllnode *buf;
|
|
|
|
if (client->fd < 0 || client->expired ||
|
|
!client->send_buf_used)
|
|
return;
|
|
|
|
if ((buf = client->deferred_send)) {
|
|
client->deferred_bytes += sizeof(struct sllnode)
|
|
+ client->send_buf_used;
|
|
if (client->deferred_bytes >
|
|
client_max_output_buffer_size) {
|
|
ERROR("client %i: output buffer size (%lu) is "
|
|
"larger than the max (%lu)\n",
|
|
client->num,
|
|
(unsigned long)client->deferred_bytes,
|
|
(unsigned long)client_max_output_buffer_size);
|
|
/* cause client to close */
|
|
client->expired = 1;
|
|
do {
|
|
struct sllnode *prev = buf;
|
|
buf = buf->next;
|
|
free(prev);
|
|
} while (buf);
|
|
client->deferred_send = NULL;
|
|
client->deferred_bytes = 0;
|
|
} else {
|
|
while (buf->next)
|
|
buf = buf->next;
|
|
buf->next = new_sllnode(client->send_buf,
|
|
client->send_buf_used);
|
|
}
|
|
} else {
|
|
if ((ret = write(client->fd, client->send_buf,
|
|
client->send_buf_used)) < 0) {
|
|
if (errno == EAGAIN || errno == EINTR) {
|
|
client->deferred_send =
|
|
new_sllnode(client->send_buf,
|
|
client->send_buf_used);
|
|
} else {
|
|
DEBUG("client %i: problems writing\n",
|
|
client->num);
|
|
client->expired = 1;
|
|
return;
|
|
}
|
|
} else if ((size_t)ret < client->send_buf_used) {
|
|
client->deferred_send =
|
|
new_sllnode(client->send_buf + ret,
|
|
client->send_buf_used - ret);
|
|
}
|
|
if (client->deferred_send) {
|
|
DEBUG("client %i: buffer created\n", client->num);
|
|
client->deferred_bytes =
|
|
client->deferred_send->size
|
|
+ sizeof(struct sllnode);
|
|
}
|
|
}
|
|
|
|
client->send_buf_used = 0;
|
|
}
|
|
|