2597066a2a329787ba713f4c48146818d7abd56a
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file http_send.c paraslash's http sender */
8
9
10 #include "server.cmdline.h"
11 #include "server.h"
12 #include "http.h"
13 #include "vss.h"
14 #include "send.h"
15 #include "list.h"
16 #include "close_on_fork.h"
17 #include "error.h"
18 #include "net.h"
19 #include "string.h"
20 #include "fd.h"
21
22 /** \cond convert sock_addr_in to ascii */
23 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
24 /* get the port number of a struct http_client */
25 #define CLIENT_PORT(hc) (hc)->addr.sin_port
26 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
27 /** \endcond */
28
29 /** The possible states of a client from the server's POV. */
30 enum http_status {
31 /** We accepted the connection on the tcp socket. */
32 HTTP_CONNECTED,
33 /** Successfully received the get request. */
34 HTTP_GOT_GET_REQUEST,
35 /** We sent the OK message back to the client. */
36 HTTP_SENT_OK_MSG,
37 /** Connection established, we might need to send the audio file header. */
38 HTTP_READY_TO_STREAM,
39 /** Connection is ready for sending audio data. */
40 HTTP_STREAMING,
41 /** We didn't receive a valid get request. */
42 HTTP_INVALID_GET_REQUEST
43 };
44
45 /** Clients will be kicked if there are more than that many bytes pending. */
46 #define MAX_BACKLOG 400000
47 /** The list of connected clients. */
48 static struct list_head clients;
49 /** The whitelist/blacklist. */
50 static struct list_head access_perm_list;
51
52 struct chunk_queue{
53 /** The list of pending chunks for this client. */
54 struct list_head q;
55 /** The number of pending bytes for this client. */
56 unsigned long num_pending;
57 unsigned long max_pending;
58 };
59
60 /** Describes one client that connected the tcp port of the http sender. */
61 struct http_client {
62 /** The file descriptor of the client. */
63 int fd;
64 /** Address information about the client. */
65 struct sockaddr_in addr;
66 /** The client's current status. */
67 enum http_status status;
68 /** Non-zero if we included \a fd in the read set.*/
69 int check_r;
70 /** Non-zero if we included \a fd in the write set. */
71 int check_w;
72 /** The position of this client in the client list. */
73 struct list_head node;
74 /** The list of pending chunks for this client. */
75 struct chunk_queue cq;
76 };
77
78 /**
79 * Describes one queued chunk of the chunk queue.
80 *
81 * The send function of the http sender checks each client fd for writing. If a
82 * client fd is not ready, it tries to queue that chunk for this client until
83 * the number of queued bytes exceeds \p MAX_BACKLOG.
84 */
85 struct queued_chunk {
86 /** The number of the queued chunk, -1U means header. */
87 unsigned chunk_num;
88 /** The number of bytes already sent. */
89 unsigned sent;
90 /** Position of the chunk in the chunk queue. */
91 struct list_head node;
92 };
93
94 /**
95 * Describes one entry in the blacklist/whitelist of the http sender.
96 */
97 struct access_info {
98 /** The address to be black/whitelisted. */
99 struct in_addr addr;
100 /** The netmask for this entry. */
101 unsigned netmask;
102 /** The position of this entry in the access_perm_list. */
103 struct list_head node;
104 };
105
106 static int server_fd = -1, numclients;
107 static struct sender *self;
108
109 static void http_shutdown_client(struct http_client *hc, const char *msg)
110 {
111 struct queued_chunk *qc, *tmp;
112 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
113 hc->fd, msg);
114 numclients--;
115 close(hc->fd);
116 del_close_on_fork_list(hc->fd);
117 list_for_each_entry_safe(qc, tmp, &hc->cq.q, node) {
118 list_del(&qc->node);
119 free(qc);
120 }
121 list_del(&hc->node);
122 free(hc);
123 }
124
125 static void http_shutdown_clients(void)
126 {
127 struct http_client *hc, *tmp;
128 list_for_each_entry_safe(hc, tmp, &clients, node)
129 http_shutdown_client(hc, "vss request");
130 }
131
132 static int http_send_msg(struct http_client *hc, const char *msg)
133 {
134 int ret = send_buffer(hc->fd, msg);
135
136 if (ret < 0)
137 http_shutdown_client(hc, "send msg failed");
138 return ret;
139 }
140
141 static void http_send_ok_msg(struct http_client *hc)
142 {
143 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
144 http_send_msg(hc, HTTP_OK_MSG);
145 }
146
147 static int http_send_err_msg(struct http_client *hc)
148 {
149 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
150 return http_send_msg(hc, HTTP_ERR_MSG);
151 }
152
153 static int enqueue_chunk(struct chunk_queue *cq, long unsigned chunk_num,
154 size_t sent)
155 {
156 struct queued_chunk *qc;
157 char *buf;
158 size_t len;
159 int ret;
160
161 if (chunk_num != -1U) {
162 ret = vss_get_chunk(chunk_num, &buf, &len);
163 if (ret < 0)
164 return ret;
165 } else
166 buf = vss_get_header(&len);
167 if (cq->num_pending + len > MAX_BACKLOG)
168 return -E_QUEUE;
169 qc = para_malloc(sizeof(struct queued_chunk));
170 cq->num_pending += len;
171 qc->chunk_num = chunk_num;
172 qc->sent = sent;
173 list_add_tail(&qc->node, &cq->q);
174 PARA_INFO_LOG("%lu bytes queued for q %p\n", cq->num_pending, &cq->q);
175 return 1;
176 }
177
178 static int send_queued_chunks(struct http_client *hc)
179 {
180 int ret;
181 struct queued_chunk *qc, *tmp;
182
183 if (list_empty(&hc->cq.q))
184 return 1;
185 list_for_each_entry_safe(qc, tmp, &hc->cq.q, node) {
186 char *buf;
187 size_t len;
188 ret = write_ok(hc->fd);
189 if (ret <= 0)
190 return ret? -E_WRITE_OK : 0;
191 if (qc->chunk_num != -1U) {
192 ret = vss_get_chunk(qc->chunk_num, &buf, &len);
193 if (ret < 0)
194 return ret;
195 } else
196 buf = vss_get_header(&len);
197 assert(len && len > qc->sent);
198 ret = write(hc->fd, buf + qc->sent, len - qc->sent);
199 if (ret < 0)
200 return -1; /* FIXME */
201 hc->cq.num_pending -= ret;
202 if (ret != len - qc->sent) {
203 qc->sent += ret;
204 return 0;
205 }
206 list_del(&qc->node);
207 free(qc);
208 }
209 return 1;
210 }
211
212 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
213 size_t sent)
214 {
215 int ret = enqueue_chunk(&hc->cq, chunk_num, sent);
216 if (ret < 0)
217 http_shutdown_client(hc, "queue error");
218 return ret;
219 }
220
221 static void http_send( long unsigned current_chunk,
222 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
223 {
224 struct http_client *hc, *tmp;
225 int ret;
226
227 list_for_each_entry_safe(hc, tmp, &clients, node) {
228 if (hc->status != HTTP_STREAMING &&
229 hc->status != HTTP_READY_TO_STREAM)
230 continue;
231 if (hc->status == HTTP_READY_TO_STREAM) {
232 unsigned hlen;
233 char *hbuf = vss_get_header(&hlen);
234 if (hbuf && hlen > 0 && current_chunk) {
235 /* need to send header */
236 PARA_INFO_LOG("queueing header: %d\n", hlen);
237 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
238 continue;
239 } else
240 PARA_INFO_LOG("no need to queue header\n");
241 hc->status = HTTP_STREAMING;
242 }
243 ret = send_queued_chunks(hc);
244 if (ret < 0) {
245 http_shutdown_client(hc, "queue send error");
246 continue;
247 }
248 if (!len)
249 continue;
250 if (!ret || write_ok(hc->fd) <= 0) {
251 PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
252 " trying to queue chunk\n", hc->fd,
253 hc->cq.num_pending);
254 queue_chunk_or_shutdown(hc, current_chunk, 0);
255 continue;
256 }
257 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
258 ret = write(hc->fd, buf, len);
259 // PARA_DEBUG_LOG("ret: %d\n", ret);
260 if (ret < 0) {
261 http_shutdown_client(hc, "send error");
262 continue;
263 }
264 if (ret != len)
265 queue_chunk_or_shutdown(hc, current_chunk, ret);
266 }
267 }
268
269 static int host_in_access_perm_list(struct http_client *hc)
270 {
271 struct access_info *ai, *tmp;
272 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
273 unsigned mask = ((~0U) >> ai->netmask);
274 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
275 return 1;
276 }
277 return 0;
278 }
279
280 static void http_post_select(fd_set *rfds, fd_set *wfds)
281 {
282 int i = -1, match;
283 struct http_client *hc, *tmp;
284 const char *err_msg;
285
286 list_for_each_entry_safe(hc, tmp, &clients, node) {
287 i++;
288 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
289 switch (hc->status) {
290 case HTTP_STREAMING: /* nothing to do */
291 case HTTP_READY_TO_STREAM:
292 break;
293 case HTTP_CONNECTED: /* need to recv get request */
294 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
295 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
296 < 0) {
297 hc->status = HTTP_INVALID_GET_REQUEST;
298 } else {
299 hc->status = HTTP_GOT_GET_REQUEST;
300 PARA_INFO_LOG("%s",
301 "received get request\n");
302 }
303 }
304 break;
305 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
306 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
307 hc->status = HTTP_SENT_OK_MSG;
308 http_send_ok_msg(hc);
309 }
310 break;
311 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
312 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
313 if (http_send_err_msg(hc) >= 0)
314 http_shutdown_client(hc,
315 "invalid get request");
316 }
317 break;
318 case HTTP_SENT_OK_MSG: /* need to send header? */
319 if (hc->check_w && FD_ISSET(hc->fd, wfds))
320 hc->status = HTTP_READY_TO_STREAM;
321 break;
322 }
323 }
324 if (!FD_ISSET(server_fd, rfds))
325 return;
326 hc = para_calloc(sizeof(struct http_client));
327 err_msg = "accept error";
328 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
329 if (hc->fd <= 0)
330 goto err_out;
331 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
332 if (conf.http_max_clients_arg > 0 && numclients >=
333 conf.http_max_clients_arg) {
334 err_msg = "server full";
335 goto err_out;
336 }
337 match = host_in_access_perm_list(hc);
338 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
339 if ((match && !conf.http_default_deny_given) ||
340 (!match && conf.http_default_deny_given)) {
341 err_msg = "permission denied";
342 goto err_out;
343 }
344 hc->status = HTTP_CONNECTED;
345 INIT_LIST_HEAD(&hc->cq.q);
346 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
347 CLIENT_ADDR(hc), hc->fd);
348 numclients++;
349 para_list_add(&hc->node, &clients);
350 add_close_on_fork_list(hc->fd);
351 mark_fd_nonblock(hc->fd);
352 return;
353 err_out:
354 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
355 CLIENT_ADDR(hc), err_msg);
356 if (hc->fd > 0)
357 close(hc->fd);
358 free(hc);
359 }
360
361 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
362 {
363 struct http_client *hc, *tmp;
364
365 if (server_fd < 0)
366 return;
367 para_fd_set(server_fd, rfds, max_fileno);
368 list_for_each_entry_safe(hc, tmp, &clients, node) {
369 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
370 hc->check_r = 0;
371 hc->check_w = 0;
372 switch (hc->status) {
373 case HTTP_STREAMING:
374 case HTTP_READY_TO_STREAM:
375 break;
376 case HTTP_CONNECTED: /* need to recv get request */
377 para_fd_set(hc->fd, rfds, max_fileno);
378 hc->check_r = 1;
379 break;
380 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
381 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
382 para_fd_set(hc->fd, wfds, max_fileno);
383 hc->check_w = 1;
384 break;
385 case HTTP_SENT_OK_MSG:
386 if (!vss_playing())
387 break; /* wait until server starts playing */
388 para_fd_set(hc->fd, wfds, max_fileno);
389 hc->check_w = 1;
390 break;
391 }
392 }
393 }
394
395 static int open_tcp_port(int port)
396 {
397 int ret;
398
399 server_fd = init_tcp_socket(port);
400 if (server_fd < 0) {
401 http_shutdown_clients();
402 self->status = SENDER_OFF;
403 return server_fd;
404 }
405 ret = mark_fd_nonblock(server_fd);
406 if (ret < 0) {
407 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
408 exit(EXIT_FAILURE);
409 }
410 self->status = SENDER_ON;
411 add_close_on_fork_list(server_fd);
412 return 1;
413 }
414
415 static int http_com_on(__a_unused struct sender_command_data *scd)
416 {
417 if (self->status == SENDER_ON)
418 return 1;
419 return open_tcp_port(conf.http_port_arg);
420 }
421
422 static int http_com_off(__a_unused struct sender_command_data *scd)
423 {
424 self->status = SENDER_OFF;
425 if (server_fd > 0) {
426 close(server_fd);
427 del_close_on_fork_list(server_fd);
428 server_fd = -1;
429 }
430 http_shutdown_clients();
431 return 1;
432 }
433
434 static void del_perm_list_entry(struct sender_command_data *scd)
435 {
436 struct access_info *ai, *tmp;
437
438 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
439 char *nad = para_strdup(inet_ntoa(ai->addr));
440 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
441 ai->netmask == scd->netmask) {
442 PARA_NOTICE_LOG("removing %s/%i from access list\n",
443 nad, ai->netmask);
444 list_del(&ai->node);
445 free(ai);
446 }
447 free(nad);
448 }
449 }
450
451 static void add_perm_list_entry(struct sender_command_data *scd)
452 {
453 struct access_info *ai = para_malloc(sizeof(struct access_info));
454 ai->addr = scd->addr;
455 ai->netmask = scd->netmask;
456 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
457 ai->netmask);
458 para_list_add(&ai->node, &access_perm_list);
459 }
460
461 static int http_com_deny(struct sender_command_data *scd)
462 {
463 if (conf.http_default_deny_given)
464 del_perm_list_entry(scd);
465 else
466 add_perm_list_entry(scd);
467 return 1;
468 }
469
470 static int http_com_allow(struct sender_command_data *scd)
471 {
472 if (conf.http_default_deny_given)
473 add_perm_list_entry(scd);
474 else
475 del_perm_list_entry(scd);
476 return 1;
477 }
478
479 static char *http_info(void)
480 {
481 char *clnts = NULL, *ap = NULL, *ret;
482 struct access_info *ai, *tmp_ai;
483 struct http_client *hc, *tmp_hc;
484
485 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
486 char *tmp = make_message("%s%s/%d ", ap? ap : "",
487 inet_ntoa(ai->addr), ai->netmask);
488 free(ap);
489 ap = tmp;
490 }
491 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
492 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
493 CLIENT_ADDR(hc), CLIENT_PORT(hc));
494 free(clnts);
495 clnts = tmp;
496 }
497 ret = make_message(
498 "http status: %s\n"
499 "http tcp port: %d\n"
500 "http clients: %d\n"
501 "http maximal number of clients: %d%s\n"
502 "http connected clients: %s\n"
503 "http access %s list: %s\n",
504 (self->status == SENDER_ON)? "on" : "off",
505 conf.http_port_arg,
506 numclients,
507 conf.http_max_clients_arg,
508 conf.http_max_clients_arg > 0? "" : " (unlimited)",
509 clnts? clnts : "(none)",
510 conf.http_default_deny_given? "allow" : "deny",
511 ap? ap : "(none)"
512 );
513 free(ap);
514 free(clnts);
515 return ret;
516 }
517
518 static void init_access_control_list(void)
519 {
520 int i;
521 struct sender_command_data scd;
522
523 INIT_LIST_HEAD(&access_perm_list);
524 for (i = 0; i < conf.http_access_given; i++) {
525 char *arg = para_strdup(conf.http_access_arg[i]);
526 char *p = strchr(arg, '/');
527 if (!p)
528 goto err;
529 *p = '\0';
530 if (!inet_aton(arg, &scd.addr))
531 goto err;
532 scd.netmask = atoi(++p);
533 if (scd.netmask < 0 || scd.netmask > 32)
534 goto err;
535 add_perm_list_entry(&scd);
536 goto success;
537 err:
538 PARA_CRIT_LOG("syntax error for http_access option "
539 "#%d, ignoring\n", i);
540 success:
541 free(arg);
542 continue;
543 }
544 }
545
546 static char *http_help(void)
547 {
548 return make_message(
549 "usage: {on|off}\n"
550 "usage: {allow|deny} IP mask\n"
551 "example: allow 127.0.0.1 32\n"
552 );
553 }
554
555 /**
556 * The init function of the http sender.
557 *
558 * \param s Pointer to the http sender struct.
559 *
560 * It initializes all function pointers of \a s, the client list and the access
561 * control list. If the autostart option was given, the tcp port is opened.
562 */
563 void http_send_init(struct sender *s)
564 {
565 INIT_LIST_HEAD(&clients);
566 s->info = http_info;
567 s->send = http_send;
568 s->pre_select = http_pre_select;
569 s->post_select = http_post_select;
570 s->shutdown_clients = http_shutdown_clients;
571 s->help = http_help;
572 s->client_cmds[SENDER_ON] = http_com_on;
573 s->client_cmds[SENDER_OFF] = http_com_off;
574 s->client_cmds[SENDER_DENY] = http_com_deny;
575 s->client_cmds[SENDER_ALLOW] = http_com_allow;
576 s->client_cmds[SENDER_ADD] = NULL;
577 s->client_cmds[SENDER_DELETE] = NULL;
578 self = s;
579 init_access_control_list();
580 if (!conf.http_no_autostart_given)
581 open_tcp_port(conf.http_port_arg); /* ignore errors */
582 PARA_DEBUG_LOG("%s", "http sender init complete\n");
583 }