33d5ed934dc3cfc05117a991be02dc9f1d2cfc6c
[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 #include <sys/types.h>
10 #include <dirent.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "string.h"
15 #include "server.cmdline.h"
16 #include "afh.h"
17 #include "afs.h"
18 #include "server.h"
19 #include "http.h"
20 #include "vss.h"
21 #include "send.h"
22 #include "list.h"
23 #include "close_on_fork.h"
24 #include "net.h"
25 #include "fd.h"
26 #include "chunk_queue.h"
27
28 /** Message sent to clients that do not send a valid get request. */
29 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
30
31
32 /** The possible states of a client from the server's POV. */
33 enum http_status {
34 /** We accepted the connection on the tcp socket. */
35 HTTP_CONNECTED,
36 /** Successfully received the get request. */
37 HTTP_GOT_GET_REQUEST,
38 /** We sent the OK message back to the client. */
39 HTTP_SENT_OK_MSG,
40 /** Connection established, we might need to send the audio file header. */
41 HTTP_READY_TO_STREAM,
42 /** Connection is ready for sending audio data. */
43 HTTP_STREAMING,
44 /** We didn't receive a valid get request. */
45 HTTP_INVALID_GET_REQUEST
46 };
47
48 /** Clients will be kicked if there are more than that many bytes pending. */
49 #define MAX_BACKLOG 400000
50 /** The list of connected clients. */
51 static struct list_head clients;
52 /** The whitelist/blacklist. */
53 static struct list_head access_perm_list;
54
55 /** Describes one client that connected the tcp port of the http sender. */
56 struct http_client {
57 /** The file descriptor of the client. */
58 int fd;
59 /** The socket `name' of the client. */
60 char *name;
61 /** The client's current status. */
62 enum http_status status;
63 /** Non-zero if we included \a fd in the read set.*/
64 int check_r;
65 /** Non-zero if we included \a fd in the write set. */
66 int check_w;
67 /** The position of this client in the client list. */
68 struct list_head node;
69 /** The list of pending chunks for this client. */
70 struct chunk_queue *cq;
71 };
72
73 /**
74 * Describes one entry in the blacklist/whitelist of the http sender.
75 */
76 struct access_info {
77 /** The address to be black/whitelisted. */
78 struct in_addr addr;
79 /** The netmask for this entry. */
80 unsigned netmask;
81 /** The position of this entry in the access_perm_list. */
82 struct list_head node;
83 };
84
85 static int server_fd = -1, numclients;
86 static struct sender *self;
87
88
89 static void http_shutdown_client(struct http_client *hc, const char *msg)
90 {
91 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc->name, hc->fd,
92 msg);
93 numclients--;
94 free(hc->name);
95 close(hc->fd);
96 del_close_on_fork_list(hc->fd);
97 cq_destroy(hc->cq);
98 list_del(&hc->node);
99 free(hc);
100 }
101
102 static void http_shutdown_clients(void)
103 {
104 struct http_client *hc, *tmp;
105 list_for_each_entry_safe(hc, tmp, &clients, node)
106 http_shutdown_client(hc, "vss request");
107 }
108
109 static int http_send_msg(struct http_client *hc, const char *msg)
110 {
111 int ret = send_buffer(hc->fd, msg);
112
113 if (ret < 0)
114 http_shutdown_client(hc, "send msg failed");
115 return ret;
116 }
117
118 static void http_send_ok_msg(struct http_client *hc)
119 {
120 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
121 http_send_msg(hc, HTTP_OK_MSG);
122 }
123
124 static int http_send_err_msg(struct http_client *hc)
125 {
126 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
127 return http_send_msg(hc, HTTP_ERR_MSG);
128 }
129
130 static int send_queued_chunks(struct http_client *hc)
131 {
132 struct queued_chunk *qc;
133 while ((qc = cq_peek(hc->cq))) {
134 char *buf;
135 size_t len;
136 int ret = write_ok(hc->fd);
137 if (ret <= 0)
138 return ret? -E_WRITE_OK : 0;
139 cq_get(qc, &buf, &len);
140 ret = write(hc->fd, buf, len);
141 if (ret < 0)
142 return -E_SEND_QUEUED_CHUNK;
143 cq_update(hc->cq, ret);
144 if (ret != len)
145 return 1;
146 cq_dequeue(hc->cq);
147 }
148 return 1;
149 }
150
151 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
152 size_t sent)
153 {
154 int ret = cq_enqueue(hc->cq, chunk_num, sent);
155 if (ret < 0)
156 http_shutdown_client(hc, "queue error");
157 return ret;
158 }
159
160 static void http_send( long unsigned current_chunk,
161 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
162 {
163 struct http_client *hc, *tmp;
164 int ret;
165
166 list_for_each_entry_safe(hc, tmp, &clients, node) {
167 if (hc->status != HTTP_STREAMING &&
168 hc->status != HTTP_READY_TO_STREAM)
169 continue;
170 if (hc->status == HTTP_READY_TO_STREAM) {
171 size_t hlen;
172 char *hbuf = vss_get_header(&hlen);
173 if (hbuf && hlen > 0 && current_chunk) {
174 /* need to send header */
175 PARA_INFO_LOG("queueing header: %zu\n", hlen);
176 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
177 continue;
178 } else
179 PARA_INFO_LOG("no need to queue header\n");
180 hc->status = HTTP_STREAMING;
181 }
182 ret = send_queued_chunks(hc);
183 if (ret < 0) {
184 http_shutdown_client(hc, "queue send error");
185 continue;
186 }
187 if (!len)
188 continue;
189 if (!ret || write_ok(hc->fd) <= 0) {
190 queue_chunk_or_shutdown(hc, current_chunk, 0);
191 continue;
192 }
193 // PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
194 ret = write(hc->fd, buf, len);
195 // PARA_DEBUG_LOG("ret: %d\n", ret);
196 if (ret < 0) {
197 http_shutdown_client(hc, "send error");
198 continue;
199 }
200 if (ret != len)
201 queue_chunk_or_shutdown(hc, current_chunk, ret);
202 }
203 }
204
205 static int host_in_access_perm_list(struct http_client *hc)
206 {
207 struct sockaddr_storage ss;
208 socklen_t sslen = sizeof(ss);
209
210 if (getpeername(hc->fd, (struct sockaddr *)&ss, &sslen) < 0) {
211 PARA_ERROR_LOG("can not determine address family: %s\n", strerror(errno));
212 } else if (ss.ss_family == AF_INET) {
213 /* FIXME: access restriction is (currently) only supported for IPv4 */
214 struct access_info *ai, *tmp;
215 struct in_addr client_addr = ((struct sockaddr_in *)&ss)->sin_addr;
216
217 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
218 unsigned mask = ((~0U) >> ai->netmask);
219 if ((client_addr.s_addr & mask) == (ai->addr.s_addr & mask))
220 return 1;
221 }
222 }
223 return 0;
224 }
225
226 static void http_post_select(fd_set *rfds, fd_set *wfds)
227 {
228 int i = -1, match;
229 struct http_client *hc, *tmp;
230 const char *err_msg;
231
232 list_for_each_entry_safe(hc, tmp, &clients, node) {
233 i++;
234 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
235 switch (hc->status) {
236 case HTTP_STREAMING: /* nothing to do */
237 case HTTP_READY_TO_STREAM:
238 break;
239 case HTTP_CONNECTED: /* need to recv get request */
240 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
241 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
242 < 0) {
243 hc->status = HTTP_INVALID_GET_REQUEST;
244 } else {
245 hc->status = HTTP_GOT_GET_REQUEST;
246 PARA_INFO_LOG("%s",
247 "received get request\n");
248 }
249 }
250 break;
251 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
252 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
253 hc->status = HTTP_SENT_OK_MSG;
254 http_send_ok_msg(hc);
255 }
256 break;
257 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
258 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
259 if (http_send_err_msg(hc) >= 0)
260 http_shutdown_client(hc,
261 "invalid get request");
262 }
263 break;
264 case HTTP_SENT_OK_MSG: /* need to send header? */
265 if (hc->check_w && FD_ISSET(hc->fd, wfds))
266 hc->status = HTTP_READY_TO_STREAM;
267 break;
268 }
269 }
270 if (!FD_ISSET(server_fd, rfds))
271 return;
272 hc = para_calloc(sizeof(struct http_client));
273 err_msg = "accept error";
274 hc->fd = para_accept(server_fd, NULL, 0);
275 if (hc->fd <= 0)
276 goto err_out;
277 hc->name = make_message("%s", remote_name(hc->fd));
278 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
279 if (conf.http_max_clients_arg > 0 && numclients >=
280 conf.http_max_clients_arg) {
281 err_msg = "server full";
282 goto err_out;
283 }
284 match = host_in_access_perm_list(hc);
285 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
286 if ((match && !conf.http_default_deny_given) ||
287 (!match && conf.http_default_deny_given)) {
288 err_msg = "permission denied";
289 goto err_out;
290 }
291 hc->status = HTTP_CONNECTED;
292 hc->cq = cq_new(MAX_BACKLOG);
293 numclients++;
294 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
295 hc->name, hc->fd);
296 para_list_add(&hc->node, &clients);
297 add_close_on_fork_list(hc->fd);
298 mark_fd_nonblocking(hc->fd);
299 return;
300 err_out:
301 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
302 hc->name, err_msg);
303 if (hc->fd > 0)
304 close(hc->fd);
305 free(hc);
306 }
307
308 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
309 {
310 struct http_client *hc, *tmp;
311
312 if (server_fd < 0)
313 return;
314 para_fd_set(server_fd, rfds, max_fileno);
315 list_for_each_entry_safe(hc, tmp, &clients, node) {
316 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
317 hc->check_r = 0;
318 hc->check_w = 0;
319 switch (hc->status) {
320 case HTTP_STREAMING:
321 case HTTP_READY_TO_STREAM:
322 break;
323 case HTTP_CONNECTED: /* need to recv get request */
324 para_fd_set(hc->fd, rfds, max_fileno);
325 hc->check_r = 1;
326 break;
327 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
328 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
329 para_fd_set(hc->fd, wfds, max_fileno);
330 hc->check_w = 1;
331 break;
332 case HTTP_SENT_OK_MSG:
333 if (!vss_playing())
334 break; /* wait until server starts playing */
335 para_fd_set(hc->fd, wfds, max_fileno);
336 hc->check_w = 1;
337 break;
338 }
339 }
340 }
341
342 static int open_tcp_port(int port)
343 {
344 int ret;
345
346 server_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
347 if (server_fd < 0) {
348 http_shutdown_clients();
349 self->status = SENDER_OFF;
350 return server_fd;
351 }
352 ret = mark_fd_nonblocking(server_fd);
353 if (ret < 0) {
354 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
355 exit(EXIT_FAILURE);
356 }
357 self->status = SENDER_ON;
358 add_close_on_fork_list(server_fd);
359 return 1;
360 }
361
362 static int http_com_on(__a_unused struct sender_command_data *scd)
363 {
364 if (self->status == SENDER_ON)
365 return 1;
366 return open_tcp_port(conf.http_port_arg);
367 }
368
369 static int http_com_off(__a_unused struct sender_command_data *scd)
370 {
371 self->status = SENDER_OFF;
372 if (server_fd > 0) {
373 close(server_fd);
374 del_close_on_fork_list(server_fd);
375 server_fd = -1;
376 }
377 http_shutdown_clients();
378 return 1;
379 }
380
381 static void del_perm_list_entry(struct sender_command_data *scd)
382 {
383 struct access_info *ai, *tmp;
384
385 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
386 char *nad = para_strdup(inet_ntoa(ai->addr));
387 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
388 ai->netmask == scd->netmask) {
389 PARA_NOTICE_LOG("removing %s/%i from access list\n",
390 nad, ai->netmask);
391 list_del(&ai->node);
392 free(ai);
393 }
394 free(nad);
395 }
396 }
397
398 static void add_perm_list_entry(struct sender_command_data *scd)
399 {
400 struct access_info *ai = para_malloc(sizeof(struct access_info));
401 ai->addr = scd->addr;
402 ai->netmask = scd->netmask;
403 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
404 ai->netmask);
405 para_list_add(&ai->node, &access_perm_list);
406 }
407
408 static int http_com_deny(struct sender_command_data *scd)
409 {
410 if (conf.http_default_deny_given)
411 del_perm_list_entry(scd);
412 else
413 add_perm_list_entry(scd);
414 return 1;
415 }
416
417 static int http_com_allow(struct sender_command_data *scd)
418 {
419 if (conf.http_default_deny_given)
420 add_perm_list_entry(scd);
421 else
422 del_perm_list_entry(scd);
423 return 1;
424 }
425
426 static char *http_info(void)
427 {
428 char *clnts = NULL, *ap = NULL, *ret;
429 struct access_info *ai, *tmp_ai;
430 struct http_client *hc, *tmp_hc;
431
432 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
433 char *tmp = make_message("%s%s/%d ", ap? ap : "",
434 inet_ntoa(ai->addr), ai->netmask);
435 free(ap);
436 ap = tmp;
437 }
438 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
439 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
440 free(clnts);
441 clnts = tmp;
442 }
443 ret = make_message(
444 "http status: %s\n"
445 "http tcp port: %d\n"
446 "http clients: %d\n"
447 "http maximal number of clients: %d%s\n"
448 "http connected clients: %s\n"
449 "http access %s list: %s\n",
450 (self->status == SENDER_ON)? "on" : "off",
451 conf.http_port_arg,
452 numclients,
453 conf.http_max_clients_arg,
454 conf.http_max_clients_arg > 0? "" : " (unlimited)",
455 clnts? clnts : "(none)",
456 conf.http_default_deny_given? "allow" : "deny",
457 ap? ap : "(none)"
458 );
459 free(ap);
460 free(clnts);
461 return ret;
462 }
463
464 static void init_access_control_list(void)
465 {
466 int i;
467 struct sender_command_data scd;
468
469 INIT_LIST_HEAD(&access_perm_list);
470 for (i = 0; i < conf.http_access_given; i++) {
471 char *arg = para_strdup(conf.http_access_arg[i]);
472 char *p = strchr(arg, '/');
473 if (!p)
474 goto err;
475 *p = '\0';
476 if (!inet_pton(AF_INET, arg, &scd.addr))
477 goto err;
478 scd.netmask = atoi(++p);
479 if (scd.netmask < 0 || scd.netmask > 32)
480 goto err;
481 add_perm_list_entry(&scd);
482 goto success;
483 err:
484 PARA_CRIT_LOG("syntax error for http_access option "
485 "#%d, ignoring\n", i);
486 success:
487 free(arg);
488 continue;
489 }
490 }
491
492 static char *http_help(void)
493 {
494 return make_message(
495 "usage: {on|off}\n"
496 "usage: {allow|deny} IP mask\n"
497 "example: allow 127.0.0.1 32\n"
498 );
499 }
500
501 /**
502 * The init function of the http sender.
503 *
504 * \param s Pointer to the http sender struct.
505 *
506 * It initializes all function pointers of \a s, the client list and the access
507 * control list. If the autostart option was given, the tcp port is opened.
508 */
509 void http_send_init(struct sender *s)
510 {
511 INIT_LIST_HEAD(&clients);
512 s->info = http_info;
513 s->send = http_send;
514 s->pre_select = http_pre_select;
515 s->post_select = http_post_select;
516 s->shutdown_clients = http_shutdown_clients;
517 s->help = http_help;
518 s->client_cmds[SENDER_ON] = http_com_on;
519 s->client_cmds[SENDER_OFF] = http_com_off;
520 s->client_cmds[SENDER_DENY] = http_com_deny;
521 s->client_cmds[SENDER_ALLOW] = http_com_allow;
522 s->client_cmds[SENDER_ADD] = NULL;
523 s->client_cmds[SENDER_DELETE] = NULL;
524 self = s;
525 init_access_control_list();
526 if (!conf.http_no_autostart_given)
527 open_tcp_port(conf.http_port_arg); /* ignore errors */
528 PARA_DEBUG_LOG("%s", "http sender init complete\n");
529 }