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[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file http_send.c paraslash's http sender */
20
21
22 #include "server.cmdline.h"
23 #include "server.h"
24 #include "http.h"
25 #include "afs.h"
26 #include "send.h"
27 #include "list.h"
28 #include "close_on_fork.h"
29 #include "error.h"
30 #include "net.h"
31 #include "string.h"
32
33 /** \cond convert sock_addr_in to ascii */
34 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
35 /* get the port number of a struct http_client */
36 #define CLIENT_PORT(hc) (hc)->addr.sin_port
37 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
38 /** \endcond */
39
40 extern struct gengetopt_args_info conf;
41
42 /** the possible states of a client from the server's POV */
43 enum http_status {
44 HTTP_CONNECTED,
45 HTTP_GOT_GET_REQUEST,
46 HTTP_SENT_OK_MSG,
47 HTTP_READY_TO_STREAM,
48 HTTP_STREAMING,
49 HTTP_INVALID_GET_REQUEST
50 };
51
52 /** clients will be kicked if there are more than that many bytes pending */
53 #define MAX_BACKLOG 40000
54 /** the list of connected clients **/
55 static struct list_head clients;
56 /** the whitelist/blacklist */
57 static struct list_head access_perm_list;
58
59 /** describes one client that connected the tcp port of the http sender */
60 struct http_client {
61 /** the file descriptor of the client */
62 int fd;
63 /** address information about the client */
64 struct sockaddr_in addr;
65 /** the client's current status */
66 enum http_status status;
67 /** non-zero if we included \a fd in the read set */
68 int check_r;
69 /** non-zero if we included \a fd in the write set */
70 int check_w;
71 /** the position of this client in the client list */
72 struct list_head node;
73 /** the list of pending packets for this client */
74 struct list_head packet_queue;
75 /** the number of pending bytes for this client */
76 unsigned long pq_bytes;
77 };
78
79 /**
80 * describes one queued data packet for a client
81 *
82 * The send function of the http sender checks each client fd for writing. If a
83 * client fd is not ready, it tries to queue that packet for this client until
84 * the number of queued bytes exceeds \p MAX_BACKLOG.
85 */
86 struct queued_packet {
87 /** the length of the packet in bytes */
88 unsigned int len;
89 /** pointer to the packet data */
90 char *packet;
91 /** position of the packet in the packet list */
92 struct list_head node;
93 };
94
95 /**
96 * describes one entry in the blacklist/whitelist of the http sender
97 */
98 struct access_info {
99 /** the address to be black/whitelisted */
100 struct in_addr addr;
101 /** the netmask for this entry */
102 int netmask;
103 /** the position of this entry in the access_perm_list */
104 struct list_head node;
105 };
106
107 static int server_fd = -1, numclients;
108 static struct sender *self;
109
110
111 static void http_shutdown_client(struct http_client *hc, const char *msg)
112 {
113 struct queued_packet *qp, *tmp;
114 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
115 hc->fd, msg);
116 numclients--;
117 close(hc->fd);
118
119 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
120 free(qp->packet);
121 list_del(&qp->node);
122 free(qp);
123 }
124 list_del(&hc->node);
125 free(hc);
126 return;
127 }
128
129 static void http_shutdown_clients_real(void)
130 {
131 struct http_client *hc, *tmp;
132 list_for_each_entry_safe(hc, tmp, &clients, node)
133 http_shutdown_client(hc, "afs request");
134 }
135 static void http_shutdown_clients(void)
136 {
137 struct http_client *hc, *tmp;
138 list_for_each_entry_safe(hc, tmp, &clients, node)
139 if (hc->status == HTTP_STREAMING)
140 http_shutdown_client(hc, "afs request");
141 }
142
143 static int http_send_msg(struct http_client *hc, const char *msg)
144 {
145 int ret = send_buffer(hc->fd, msg);
146
147 if (ret < 0)
148 http_shutdown_client(hc, "send msg failed");
149 return ret;
150 }
151
152 static void http_send_ok_msg(struct http_client *hc)
153 {
154 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
155 http_send_msg(hc, HTTP_OK_MSG);
156 }
157
158 static int http_send_err_msg(struct http_client *hc)
159 {
160 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
161 return http_send_msg(hc, HTTP_ERR_MSG);
162 }
163
164 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
165 {
166 struct queued_packet *qp;
167 if (hc->pq_bytes + len > MAX_BACKLOG) {
168 http_shutdown_client(hc, "packet queue overrun");
169 return -E_QUEUE;
170 }
171 qp = para_malloc(sizeof(struct queued_packet));
172 hc->pq_bytes += len;
173 qp->packet = para_malloc(len);
174 memcpy(qp->packet, buf, len);
175 qp->len = len;
176 list_add_tail(&qp->node, &hc->packet_queue);
177 PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
178 return 1;
179 }
180
181 static int write_ok(int fd)
182 {
183 struct timeval tv = {0, 0};
184 fd_set wfds;
185 int ret;
186 again:
187 FD_ZERO(&wfds);
188 FD_SET(fd, &wfds);
189 ret = select(fd + 1, NULL, &wfds, NULL, &tv);
190 if (ret < 0 && errno == EINTR)
191 goto again;
192 if (ret < 0)
193 ret = -E_WRITE_OK;
194 return ret;
195 }
196
197
198 static int send_queued_packets(struct http_client *hc)
199 {
200 int ret;
201 struct queued_packet *qp, *tmp;
202
203 if (list_empty(&hc->packet_queue))
204 return 1;
205 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
206 ret = write_ok(hc->fd);
207 if (ret <= 0)
208 return ret;
209 ret = write(hc->fd, qp->packet, qp->len);
210 if (ret < 0)
211 return ret;
212 if (ret != qp->len) {
213 qp->len -= ret;
214 memmove(qp->packet, qp->packet + ret, qp->len);
215 return 0;
216 }
217 hc->pq_bytes -= qp->len;
218 free(qp->packet);
219 list_del(&qp->node);
220 free(qp);
221 }
222 return 1;
223 }
224
225 static void http_send(__unused struct audio_format *af,
226 long unsigned current_chunk,
227 __unused long unsigned chunks_sent, const char *buf, size_t len)
228 {
229 struct http_client *hc, *tmp;
230 int ret;
231
232 list_for_each_entry_safe(hc, tmp, &clients, node) {
233 if (hc->status != HTTP_STREAMING &&
234 hc->status != HTTP_READY_TO_STREAM)
235 continue;
236 if (hc->status == HTTP_READY_TO_STREAM) {
237 if (af->get_header_info && current_chunk) {
238 /* need to send header */
239 int hlen;
240 char *buf = af->get_header_info(&hlen);
241 if (!buf || hlen <= 0)
242 continue; /* header not yet available */
243 PARA_INFO_LOG("queueing header: %d\n", hlen);
244 if (queue_packet(hc, buf, hlen) < 0)
245 continue;
246 } else
247 PARA_INFO_LOG("%s", "no need to queue header\n");
248 hc->status = HTTP_STREAMING;
249 }
250 ret = send_queued_packets(hc);
251 if (ret < 0) {
252 http_shutdown_client(hc, "send error");
253 continue;
254 }
255 if (!len)
256 continue;
257 if (!ret || write_ok(hc->fd) <= 0) {
258 PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
259 " trying to queue packet\n", hc->fd,
260 hc->pq_bytes);
261 queue_packet(hc, buf, len);
262 continue;
263 }
264 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
265 ret = write(hc->fd, buf, len);
266 if (ret < 0) {
267 http_shutdown_client(hc, "send error");
268 continue;
269 }
270 if (ret != len)
271 queue_packet(hc, buf + ret, len - ret);
272 }
273 }
274
275 static int host_in_access_perm_list(struct http_client *hc)
276 {
277 struct access_info *ai, *tmp;
278 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
279 unsigned mask = ((~0) >> ai->netmask);
280 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
281 return 1;
282 }
283 return 0;
284 }
285
286 static void http_post_select(__unused struct audio_format *af, fd_set *rfds,
287 fd_set *wfds)
288 {
289 int i = -1, match;
290 struct http_client *hc, *tmp;
291 char *err_msg;
292
293 list_for_each_entry_safe(hc, tmp, &clients, node) {
294 i++;
295 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
296 switch (hc->status) {
297 case HTTP_STREAMING: /* nothing to do */
298 case HTTP_READY_TO_STREAM:
299 break;
300 case HTTP_CONNECTED: /* need to recv get request */
301 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
302 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
303 < 0) {
304 hc->status = HTTP_INVALID_GET_REQUEST;
305 } else {
306 hc->status = HTTP_GOT_GET_REQUEST;
307 PARA_INFO_LOG("%s",
308 "received get request\n");
309 }
310 }
311 break;
312 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
313 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
314 hc->status = HTTP_SENT_OK_MSG;
315 http_send_ok_msg(hc);
316 }
317 break;
318 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
319 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
320 if (http_send_err_msg(hc) >= 0)
321 http_shutdown_client(hc,
322 "invalid get request");
323 }
324 break;
325 case HTTP_SENT_OK_MSG: /* need to send header? */
326 if (hc->check_w && FD_ISSET(hc->fd, wfds))
327 hc->status = HTTP_READY_TO_STREAM;
328 break;
329 }
330 }
331 if (!FD_ISSET(server_fd, rfds))
332 return;
333 hc = para_calloc(sizeof(struct http_client));
334 err_msg = "accept error";
335 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
336 if (hc->fd <= 0)
337 goto err_out;
338 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
339 if (conf.http_max_clients_arg > 0 && numclients >=
340 conf.http_max_clients_arg) {
341 err_msg = "server full";
342 goto err_out;
343 }
344 match = host_in_access_perm_list(hc);
345 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
346 if ((match && !conf.http_default_deny_given) ||
347 (!match && conf.http_default_deny_given)) {
348 err_msg = "permission denied";
349 goto err_out;
350 }
351 hc->status = HTTP_CONNECTED;
352 INIT_LIST_HEAD(&hc->packet_queue);
353 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
354 CLIENT_ADDR(hc), hc->fd);
355 numclients++;
356 list_add(&hc->node, &clients);
357 return;
358 err_out:
359 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
360 CLIENT_ADDR(hc), err_msg);
361 if (hc->fd > 0)
362 close(hc->fd);
363 free(hc);
364 }
365
366 static void http_pre_select(struct audio_format *af, int *max_fileno, fd_set *rfds,
367 fd_set *wfds)
368 {
369 struct http_client *hc, *tmp;
370
371 if (server_fd < 0)
372 return;
373 FD_SET(server_fd, rfds);
374 *max_fileno = MAX(*max_fileno, server_fd);
375 list_for_each_entry_safe(hc, tmp, &clients, node) {
376 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
377 hc->check_r = 0;
378 hc->check_w = 0;
379 switch (hc->status) {
380 case HTTP_STREAMING:
381 case HTTP_READY_TO_STREAM:
382 break;
383 case HTTP_CONNECTED: /* need to recv get request */
384 FD_SET(hc->fd, rfds);
385 *max_fileno = MAX(*max_fileno, hc->fd);
386 hc->check_r = 1;
387 break;
388 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
389 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
390 FD_SET(hc->fd, wfds);
391 *max_fileno = MAX(*max_fileno, hc->fd);
392 hc->check_w = 1;
393 break;
394 case HTTP_SENT_OK_MSG:
395 if (!af || !afs_playing())
396 break; /* wait until server starts playing */
397 FD_SET(hc->fd, wfds);
398 *max_fileno = MAX(*max_fileno, hc->fd);
399 hc->check_w = 1;
400 break;
401 }
402 }
403 }
404
405 static int open_tcp_port(int port)
406 {
407 server_fd = init_tcp_socket(port);
408 if (server_fd < 0) {
409 http_shutdown_clients_real();
410 self->status = SENDER_OFF;
411 return server_fd;
412 }
413 self->status = SENDER_ON;
414 add_close_on_fork_list(server_fd);
415 return 1;
416 }
417
418 static int http_com_on(__unused struct sender_command_data *scd)
419 {
420 if (self->status == SENDER_ON)
421 return 1;
422 return open_tcp_port(conf.http_port_arg);
423 }
424
425 static int http_com_off(__unused struct sender_command_data *scd)
426 {
427 self->status = SENDER_OFF;
428 if (server_fd > 0) {
429 close(server_fd);
430 del_close_on_fork_list(server_fd);
431 server_fd = -1;
432 }
433 http_shutdown_clients_real();
434 return 1;
435 }
436
437 static void del_perm_list_entry(struct sender_command_data *scd)
438 {
439 struct access_info *ai, *tmp;
440
441 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
442 char *nad = para_strdup(inet_ntoa(ai->addr));
443 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
444 ai->netmask == scd->netmask) {
445 PARA_NOTICE_LOG("removing %s/%i from access list\n",
446 nad, ai->netmask);
447 list_del(&ai->node);
448 free(ai);
449 }
450 free(nad);
451 }
452 }
453
454 static void add_perm_list_entry(struct sender_command_data *scd)
455 {
456 struct access_info *ai = para_malloc(sizeof(struct access_info));
457 ai->addr = scd->addr;
458 ai->netmask = scd->netmask;
459 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
460 ai->netmask);
461 list_add(&ai->node, &access_perm_list);
462 }
463
464 static int http_com_deny(struct sender_command_data *scd)
465 {
466 if (conf.http_default_deny_given)
467 del_perm_list_entry(scd);
468 else
469 add_perm_list_entry(scd);
470 return 1;
471 }
472
473 static int http_com_allow(struct sender_command_data *scd)
474 {
475 if (conf.http_default_deny_given)
476 add_perm_list_entry(scd);
477 else
478 del_perm_list_entry(scd);
479 return 1;
480 }
481
482 static char *http_info(void)
483 {
484 char *clnts = NULL, *ap = NULL, *ret;
485 struct access_info *ai, *tmp_ai;
486 struct http_client *hc, *tmp_hc;
487
488 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
489 char *tmp = make_message("%s%s/%d ", ap? ap : "",
490 inet_ntoa(ai->addr), ai->netmask);
491 free(ap);
492 ap = tmp;
493 }
494 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
495 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
496 CLIENT_ADDR(hc), CLIENT_PORT(hc));
497 free(clnts);
498 clnts = tmp;
499 }
500 ret = make_message(
501 "http status: %s\n"
502 "http tcp port: %d\n"
503 "http clients: %d\n"
504 "http maximal number of clients: %d%s\n"
505 "http connected clients: %s\n"
506 "http access %s list: %s\n",
507 (self->status == SENDER_ON)? "on" : "off",
508 conf.http_port_arg,
509 numclients,
510 conf.http_max_clients_arg,
511 conf.http_max_clients_arg > 0? "" : " (unlimited)",
512 clnts? clnts : "(none)",
513 conf.http_default_deny_given? "allow" : "deny",
514 ap? ap : "(none)"
515 );
516 free(ap);
517 free(clnts);
518 return ret;
519 }
520
521 static void init_access_control_list(void)
522 {
523 int i;
524 struct sender_command_data scd;
525
526 INIT_LIST_HEAD(&access_perm_list);
527 for (i = 0; i < conf.http_access_given; i++) {
528 char *arg = para_strdup(conf.http_access_arg[i]);
529 char *p = strchr(arg, '/');
530 if (!p)
531 goto err;
532 *p = '\0';
533 if (!inet_aton(arg, &scd.addr))
534 goto err;
535 scd.netmask = atoi(++p);
536 if (scd.netmask < 0 || scd.netmask > 32)
537 goto err;
538 add_perm_list_entry(&scd);
539 goto success;
540 err:
541 PARA_CRIT_LOG("syntax error for http_access option "
542 "#%d, ignoring\n", i);
543 success:
544 free(arg);
545 continue;
546 }
547 }
548
549 static char *http_help(void)
550 {
551 return make_message(
552 "usage: {on|off}\n"
553 "usage: {allow|deny} IP mask\n"
554 "example: allow 127.0.0.1 32\n"
555 );
556 }
557
558 /**
559 * the init function of the http sender
560 *
561 * \param s pointer to the http sender struct
562 *
563 * It initializes all function pointers of \a s, init the client list and the
564 * acess control list as well. If autostart is wanted, open the tcp port.
565 */
566 void http_send_init(struct sender *s)
567 {
568 INIT_LIST_HEAD(&clients);
569 s->info = http_info;
570 s->send = http_send;
571 s->pre_select = http_pre_select;
572 s->post_select = http_post_select;
573 s->shutdown_clients = http_shutdown_clients;
574 s->help = http_help;
575 s->client_cmds[SENDER_ON] = http_com_on;
576 s->client_cmds[SENDER_OFF] = http_com_off;
577 s->client_cmds[SENDER_DENY] = http_com_deny;
578 s->client_cmds[SENDER_ALLOW] = http_com_allow;
579 s->client_cmds[SENDER_ADD] = NULL;
580 s->client_cmds[SENDER_DELETE] = NULL;
581 self = s;
582 init_access_control_list();
583 if (!conf.http_no_autostart_given)
584 open_tcp_port(conf.http_port_arg);
585 PARA_DEBUG_LOG("%s", "http sender init complete\n");
586 }