2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file http_send.c paraslash's http sender */
13 #include "server.cmdline.h"
20 #include "close_on_fork.h"
25 #include "chunk_queue.h"
27 /** \cond convert sock_addr_in to ascii */
28 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
29 /* get the port number of a struct http_client */
30 #define CLIENT_PORT(hc) (hc)->addr.sin_port
31 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
34 /** The possible states of a client from the server's POV. */
36 /** We accepted the connection on the tcp socket. */
38 /** Successfully received the get request. */
40 /** We sent the OK message back to the client. */
42 /** Connection established, we might need to send the audio file header. */
44 /** Connection is ready for sending audio data. */
46 /** We didn't receive a valid get request. */
47 HTTP_INVALID_GET_REQUEST
50 /** Clients will be kicked if there are more than that many bytes pending. */
51 #define MAX_BACKLOG 400000
52 /** The list of connected clients. */
53 static struct list_head clients
;
54 /** The whitelist/blacklist. */
55 static struct list_head access_perm_list
;
57 /** Describes one client that connected the tcp port of the http sender. */
59 /** The file descriptor of the client. */
61 /** Address information about the client. */
62 struct sockaddr_in addr
;
63 /** The client's current status. */
64 enum http_status status
;
65 /** Non-zero if we included \a fd in the read set.*/
67 /** Non-zero if we included \a fd in the write set. */
69 /** The position of this client in the client list. */
70 struct list_head node
;
71 /** The list of pending chunks for this client. */
72 struct chunk_queue
*cq
;
76 * Describes one entry in the blacklist/whitelist of the http sender.
79 /** The address to be black/whitelisted. */
81 /** The netmask for this entry. */
83 /** The position of this entry in the access_perm_list. */
84 struct list_head node
;
87 static int server_fd
= -1, numclients
;
88 static struct sender
*self
;
91 static void http_shutdown_client(struct http_client
*hc
, const char *msg
)
93 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc
),
97 del_close_on_fork_list(hc
->fd
);
103 static void http_shutdown_clients(void)
105 struct http_client
*hc
, *tmp
;
106 list_for_each_entry_safe(hc
, tmp
, &clients
, node
)
107 http_shutdown_client(hc
, "vss request");
110 static int http_send_msg(struct http_client
*hc
, const char *msg
)
112 int ret
= send_buffer(hc
->fd
, msg
);
115 http_shutdown_client(hc
, "send msg failed");
119 static void http_send_ok_msg(struct http_client
*hc
)
121 PARA_INFO_LOG("sending http ok message to fd %d\n", hc
->fd
);
122 http_send_msg(hc
, HTTP_OK_MSG
);
125 static int http_send_err_msg(struct http_client
*hc
)
127 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc
->fd
);
128 return http_send_msg(hc
, HTTP_ERR_MSG
);
131 static int send_queued_chunks(struct http_client
*hc
)
133 struct queued_chunk
*qc
;
134 while ((qc
= cq_peek(hc
->cq
))) {
137 int ret
= write_ok(hc
->fd
);
139 return ret
? -E_WRITE_OK
: 0;
140 cq_get(qc
, &buf
, &len
);
141 ret
= write(hc
->fd
, buf
, len
);
143 return -E_SEND_QUEUED_CHUNK
;
144 cq_update(hc
->cq
, ret
);
152 static int queue_chunk_or_shutdown(struct http_client
*hc
, long unsigned chunk_num
,
155 int ret
= cq_enqueue(hc
->cq
, chunk_num
, sent
);
157 http_shutdown_client(hc
, "queue error");
161 static void http_send( long unsigned current_chunk
,
162 __a_unused
long unsigned chunks_sent
, const char *buf
, size_t len
)
164 struct http_client
*hc
, *tmp
;
167 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
168 if (hc
->status
!= HTTP_STREAMING
&&
169 hc
->status
!= HTTP_READY_TO_STREAM
)
171 if (hc
->status
== HTTP_READY_TO_STREAM
) {
173 char *hbuf
= vss_get_header(&hlen
);
174 if (hbuf
&& hlen
> 0 && current_chunk
) {
175 /* need to send header */
176 PARA_INFO_LOG("queueing header: %zu\n", hlen
);
177 if (queue_chunk_or_shutdown(hc
, -1U, 0) < 0)
180 PARA_INFO_LOG("no need to queue header\n");
181 hc
->status
= HTTP_STREAMING
;
183 ret
= send_queued_chunks(hc
);
185 http_shutdown_client(hc
, "queue send error");
190 if (!ret
|| write_ok(hc
->fd
) <= 0) {
191 queue_chunk_or_shutdown(hc
, current_chunk
, 0);
194 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
195 ret
= write(hc
->fd
, buf
, len
);
196 // PARA_DEBUG_LOG("ret: %d\n", ret);
198 http_shutdown_client(hc
, "send error");
202 queue_chunk_or_shutdown(hc
, current_chunk
, ret
);
206 static int host_in_access_perm_list(struct http_client
*hc
)
208 struct access_info
*ai
, *tmp
;
209 list_for_each_entry_safe(ai
, tmp
, &access_perm_list
, node
) {
210 unsigned mask
= ((~0U) >> ai
->netmask
);
211 if ((hc
->addr
.sin_addr
.s_addr
& mask
) == (ai
->addr
.s_addr
& mask
))
217 static void http_post_select(fd_set
*rfds
, fd_set
*wfds
)
220 struct http_client
*hc
, *tmp
;
223 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
225 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
226 switch (hc
->status
) {
227 case HTTP_STREAMING
: /* nothing to do */
228 case HTTP_READY_TO_STREAM
:
230 case HTTP_CONNECTED
: /* need to recv get request */
231 if (hc
->check_r
&& FD_ISSET(hc
->fd
, rfds
)) {
232 if (recv_pattern(hc
->fd
, HTTP_GET_MSG
, MAXLINE
)
234 hc
->status
= HTTP_INVALID_GET_REQUEST
;
236 hc
->status
= HTTP_GOT_GET_REQUEST
;
238 "received get request\n");
242 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
243 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
244 hc
->status
= HTTP_SENT_OK_MSG
;
245 http_send_ok_msg(hc
);
248 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
249 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
)) {
250 if (http_send_err_msg(hc
) >= 0)
251 http_shutdown_client(hc
,
252 "invalid get request");
255 case HTTP_SENT_OK_MSG
: /* need to send header? */
256 if (hc
->check_w
&& FD_ISSET(hc
->fd
, wfds
))
257 hc
->status
= HTTP_READY_TO_STREAM
;
261 if (!FD_ISSET(server_fd
, rfds
))
263 hc
= para_calloc(sizeof(struct http_client
));
264 err_msg
= "accept error";
265 hc
->fd
= para_accept(server_fd
, &hc
->addr
, sizeof(struct sockaddr_in
));
268 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc
), hc
->fd
);
269 if (conf
.http_max_clients_arg
> 0 && numclients
>=
270 conf
.http_max_clients_arg
) {
271 err_msg
= "server full";
274 match
= host_in_access_perm_list(hc
);
275 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match
);
276 if ((match
&& !conf
.http_default_deny_given
) ||
277 (!match
&& conf
.http_default_deny_given
)) {
278 err_msg
= "permission denied";
281 hc
->status
= HTTP_CONNECTED
;
282 hc
->cq
= cq_new(MAX_BACKLOG
);
283 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients
,
284 CLIENT_ADDR(hc
), hc
->fd
);
286 para_list_add(&hc
->node
, &clients
);
287 add_close_on_fork_list(hc
->fd
);
288 mark_fd_nonblock(hc
->fd
);
291 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
292 CLIENT_ADDR(hc
), err_msg
);
298 static void http_pre_select(int *max_fileno
, fd_set
*rfds
, fd_set
*wfds
)
300 struct http_client
*hc
, *tmp
;
304 para_fd_set(server_fd
, rfds
, max_fileno
);
305 list_for_each_entry_safe(hc
, tmp
, &clients
, node
) {
306 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
309 switch (hc
->status
) {
311 case HTTP_READY_TO_STREAM
:
313 case HTTP_CONNECTED
: /* need to recv get request */
314 para_fd_set(hc
->fd
, rfds
, max_fileno
);
317 case HTTP_GOT_GET_REQUEST
: /* need to send ok msg */
318 case HTTP_INVALID_GET_REQUEST
: /* need to send err msg */
319 para_fd_set(hc
->fd
, wfds
, max_fileno
);
322 case HTTP_SENT_OK_MSG
:
324 break; /* wait until server starts playing */
325 para_fd_set(hc
->fd
, wfds
, max_fileno
);
332 static int open_tcp_port(int port
)
336 server_fd
= init_tcp_socket(port
);
338 http_shutdown_clients();
339 self
->status
= SENDER_OFF
;
342 ret
= mark_fd_nonblock(server_fd
);
344 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
347 self
->status
= SENDER_ON
;
348 add_close_on_fork_list(server_fd
);
352 static int http_com_on(__a_unused
struct sender_command_data
*scd
)
354 if (self
->status
== SENDER_ON
)
356 return open_tcp_port(conf
.http_port_arg
);
359 static int http_com_off(__a_unused
struct sender_command_data
*scd
)
361 self
->status
= SENDER_OFF
;
364 del_close_on_fork_list(server_fd
);
367 http_shutdown_clients();
371 static void del_perm_list_entry(struct sender_command_data
*scd
)
373 struct access_info
*ai
, *tmp
;
375 list_for_each_entry_safe(ai
, tmp
, &access_perm_list
, node
) {
376 char *nad
= para_strdup(inet_ntoa(ai
->addr
));
377 if (!strcmp(nad
, inet_ntoa(scd
->addr
)) &&
378 ai
->netmask
== scd
->netmask
) {
379 PARA_NOTICE_LOG("removing %s/%i from access list\n",
388 static void add_perm_list_entry(struct sender_command_data
*scd
)
390 struct access_info
*ai
= para_malloc(sizeof(struct access_info
));
391 ai
->addr
= scd
->addr
;
392 ai
->netmask
= scd
->netmask
;
393 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai
->addr
),
395 para_list_add(&ai
->node
, &access_perm_list
);
398 static int http_com_deny(struct sender_command_data
*scd
)
400 if (conf
.http_default_deny_given
)
401 del_perm_list_entry(scd
);
403 add_perm_list_entry(scd
);
407 static int http_com_allow(struct sender_command_data
*scd
)
409 if (conf
.http_default_deny_given
)
410 add_perm_list_entry(scd
);
412 del_perm_list_entry(scd
);
416 static char *http_info(void)
418 char *clnts
= NULL
, *ap
= NULL
, *ret
;
419 struct access_info
*ai
, *tmp_ai
;
420 struct http_client
*hc
, *tmp_hc
;
422 list_for_each_entry_safe(ai
, tmp_ai
, &access_perm_list
, node
) {
423 char *tmp
= make_message("%s%s/%d ", ap
? ap
: "",
424 inet_ntoa(ai
->addr
), ai
->netmask
);
428 list_for_each_entry_safe(hc
, tmp_hc
, &clients
, node
) {
429 char *tmp
= make_message("%s%s:%d ", clnts
? clnts
: "",
430 CLIENT_ADDR(hc
), CLIENT_PORT(hc
));
436 "http tcp port: %d\n"
438 "http maximal number of clients: %d%s\n"
439 "http connected clients: %s\n"
440 "http access %s list: %s\n",
441 (self
->status
== SENDER_ON
)? "on" : "off",
444 conf
.http_max_clients_arg
,
445 conf
.http_max_clients_arg
> 0? "" : " (unlimited)",
446 clnts
? clnts
: "(none)",
447 conf
.http_default_deny_given
? "allow" : "deny",
455 static void init_access_control_list(void)
458 struct sender_command_data scd
;
460 INIT_LIST_HEAD(&access_perm_list
);
461 for (i
= 0; i
< conf
.http_access_given
; i
++) {
462 char *arg
= para_strdup(conf
.http_access_arg
[i
]);
463 char *p
= strchr(arg
, '/');
467 if (!inet_aton(arg
, &scd
.addr
))
469 scd
.netmask
= atoi(++p
);
470 if (scd
.netmask
< 0 || scd
.netmask
> 32)
472 add_perm_list_entry(&scd
);
475 PARA_CRIT_LOG("syntax error for http_access option "
476 "#%d, ignoring\n", i
);
483 static char *http_help(void)
487 "usage: {allow|deny} IP mask\n"
488 "example: allow 127.0.0.1 32\n"
493 * The init function of the http sender.
495 * \param s Pointer to the http sender struct.
497 * It initializes all function pointers of \a s, the client list and the access
498 * control list. If the autostart option was given, the tcp port is opened.
500 void http_send_init(struct sender
*s
)
502 INIT_LIST_HEAD(&clients
);
505 s
->pre_select
= http_pre_select
;
506 s
->post_select
= http_post_select
;
507 s
->shutdown_clients
= http_shutdown_clients
;
509 s
->client_cmds
[SENDER_ON
] = http_com_on
;
510 s
->client_cmds
[SENDER_OFF
] = http_com_off
;
511 s
->client_cmds
[SENDER_DENY
] = http_com_deny
;
512 s
->client_cmds
[SENDER_ALLOW
] = http_com_allow
;
513 s
->client_cmds
[SENDER_ADD
] = NULL
;
514 s
->client_cmds
[SENDER_DELETE
] = NULL
;
516 init_access_control_list();
517 if (!conf
.http_no_autostart_given
)
518 open_tcp_port(conf
.http_port_arg
); /* ignore errors */
519 PARA_DEBUG_LOG("%s", "http sender init complete\n");