Merge commit 'remotes/fml/master'
[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 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
29 /** \endcond */
30
31 /** The possible states of a client from the server's POV. */
32 enum http_status {
33 /** We accepted the connection on the tcp socket. */
34 HTTP_CONNECTED,
35 /** Successfully received the get request. */
36 HTTP_GOT_GET_REQUEST,
37 /** We sent the OK message back to the client. */
38 HTTP_SENT_OK_MSG,
39 /** Connection established, we might need to send the audio file header. */
40 HTTP_READY_TO_STREAM,
41 /** Connection is ready for sending audio data. */
42 HTTP_STREAMING,
43 /** We didn't receive a valid get request. */
44 HTTP_INVALID_GET_REQUEST
45 };
46
47 /** Clients will be kicked if there are more than that many bytes pending. */
48 #define MAX_BACKLOG 400000
49 /** The list of connected clients. */
50 static struct list_head clients;
51 /** The whitelist/blacklist. */
52 static struct list_head access_perm_list;
53
54 /** Describes one client that connected the tcp port of the http sender. */
55 struct http_client {
56 /** The file descriptor of the client. */
57 int fd;
58 /** The socket `name' of the client. */
59 char *name;
60 /** The client's current status. */
61 enum http_status status;
62 /** Non-zero if we included \a fd in the read set.*/
63 int check_r;
64 /** Non-zero if we included \a fd in the write set. */
65 int check_w;
66 /** The position of this client in the client list. */
67 struct list_head node;
68 /** The list of pending chunks for this client. */
69 struct chunk_queue *cq;
70 };
71
72 /**
73 * Describes one entry in the blacklist/whitelist of the http sender.
74 */
75 struct access_info {
76 /** The address to be black/whitelisted. */
77 struct in_addr addr;
78 /** The netmask for this entry. */
79 unsigned netmask;
80 /** The position of this entry in the access_perm_list. */
81 struct list_head node;
82 };
83
84 static int server_fd = -1, numclients;
85 static struct sender *self;
86
87
88 static void http_shutdown_client(struct http_client *hc, const char *msg)
89 {
90 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n",
91 hc->name, hc->fd, msg);
92 numclients--;
93 free(hc->name);
94 close(hc->fd);
95 del_close_on_fork_list(hc->fd);
96 cq_destroy(hc->cq);
97 list_del(&hc->node);
98 free(hc);
99 }
100
101 static void http_shutdown_clients(void)
102 {
103 struct http_client *hc, *tmp;
104 list_for_each_entry_safe(hc, tmp, &clients, node)
105 http_shutdown_client(hc, "vss request");
106 }
107
108 static int http_send_msg(struct http_client *hc, const char *msg)
109 {
110 int ret = send_buffer(hc->fd, msg);
111
112 if (ret < 0)
113 http_shutdown_client(hc, "send msg failed");
114 return ret;
115 }
116
117 static void http_send_ok_msg(struct http_client *hc)
118 {
119 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
120 http_send_msg(hc, HTTP_OK_MSG);
121 }
122
123 static int http_send_err_msg(struct http_client *hc)
124 {
125 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
126 return http_send_msg(hc, HTTP_ERR_MSG);
127 }
128
129 static int send_queued_chunks(struct http_client *hc)
130 {
131 struct queued_chunk *qc;
132 while ((qc = cq_peek(hc->cq))) {
133 char *buf;
134 size_t len;
135 int ret = write_ok(hc->fd);
136 if (ret <= 0)
137 return ret? -E_WRITE_OK : 0;
138 cq_get(qc, &buf, &len);
139 ret = write(hc->fd, buf, len);
140 if (ret < 0)
141 return -E_SEND_QUEUED_CHUNK;
142 cq_update(hc->cq, ret);
143 if (ret != len)
144 return 1;
145 cq_dequeue(hc->cq);
146 }
147 return 1;
148 }
149
150 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
151 size_t sent)
152 {
153 int ret = cq_enqueue(hc->cq, chunk_num, sent);
154 if (ret < 0)
155 http_shutdown_client(hc, "queue error");
156 return ret;
157 }
158
159 static void http_send( long unsigned current_chunk,
160 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
161 {
162 struct http_client *hc, *tmp;
163 int ret;
164
165 list_for_each_entry_safe(hc, tmp, &clients, node) {
166 if (hc->status != HTTP_STREAMING &&
167 hc->status != HTTP_READY_TO_STREAM)
168 continue;
169 if (hc->status == HTTP_READY_TO_STREAM) {
170 size_t hlen;
171 char *hbuf = vss_get_header(&hlen);
172 if (hbuf && hlen > 0 && current_chunk) {
173 /* need to send header */
174 PARA_INFO_LOG("queueing header: %zu\n", hlen);
175 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
176 continue;
177 } else
178 PARA_INFO_LOG("no need to queue header\n");
179 hc->status = HTTP_STREAMING;
180 }
181 ret = send_queued_chunks(hc);
182 if (ret < 0) {
183 http_shutdown_client(hc, "queue send error");
184 continue;
185 }
186 if (!len)
187 continue;
188 if (!ret || write_ok(hc->fd) <= 0) {
189 queue_chunk_or_shutdown(hc, current_chunk, 0);
190 continue;
191 }
192 // PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
193 ret = write(hc->fd, buf, len);
194 // PARA_DEBUG_LOG("ret: %d\n", ret);
195 if (ret < 0) {
196 http_shutdown_client(hc, "send error");
197 continue;
198 }
199 if (ret != len)
200 queue_chunk_or_shutdown(hc, current_chunk, ret);
201 }
202 }
203
204 static int host_in_access_perm_list(struct http_client *hc)
205 {
206 struct sockaddr_storage ss;
207 socklen_t sslen = sizeof(ss);
208
209 if (getpeername(hc->fd, (struct sockaddr *)&ss, &sslen) < 0) {
210 PARA_ERROR_LOG("can not determine address family: %s\n", strerror(errno));
211 } else if (ss.ss_family == AF_INET) {
212 /* FIXME: access restriction is (currently) only supported for IPv4 */
213 struct access_info *ai, *tmp;
214 struct in_addr client_addr = ((struct sockaddr_in *)&ss)->sin_addr;
215
216 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
217 unsigned mask = ((~0U) >> ai->netmask);
218 if ((client_addr.s_addr & mask) == (ai->addr.s_addr & mask))
219 return 1;
220 }
221 }
222 return 0;
223 }
224
225 static void http_post_select(fd_set *rfds, fd_set *wfds)
226 {
227 int i = -1, match;
228 struct http_client *hc, *tmp;
229 const char *err_msg;
230
231 list_for_each_entry_safe(hc, tmp, &clients, node) {
232 i++;
233 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
234 switch (hc->status) {
235 case HTTP_STREAMING: /* nothing to do */
236 case HTTP_READY_TO_STREAM:
237 break;
238 case HTTP_CONNECTED: /* need to recv get request */
239 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
240 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
241 < 0) {
242 hc->status = HTTP_INVALID_GET_REQUEST;
243 } else {
244 hc->status = HTTP_GOT_GET_REQUEST;
245 PARA_INFO_LOG("%s",
246 "received get request\n");
247 }
248 }
249 break;
250 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
251 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
252 hc->status = HTTP_SENT_OK_MSG;
253 http_send_ok_msg(hc);
254 }
255 break;
256 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
257 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
258 if (http_send_err_msg(hc) >= 0)
259 http_shutdown_client(hc,
260 "invalid get request");
261 }
262 break;
263 case HTTP_SENT_OK_MSG: /* need to send header? */
264 if (hc->check_w && FD_ISSET(hc->fd, wfds))
265 hc->status = HTTP_READY_TO_STREAM;
266 break;
267 }
268 }
269 if (!FD_ISSET(server_fd, rfds))
270 return;
271 hc = para_calloc(sizeof(struct http_client));
272 err_msg = "accept error";
273 hc->fd = para_accept(server_fd, NULL, 0);
274 if (hc->fd <= 0)
275 goto err_out;
276 hc->name = make_message("%s", remote_name(hc->fd));
277 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
278 if (conf.http_max_clients_arg > 0 && numclients >=
279 conf.http_max_clients_arg) {
280 err_msg = "server full";
281 goto err_out;
282 }
283 match = host_in_access_perm_list(hc);
284 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
285 if ((match && !conf.http_default_deny_given) ||
286 (!match && conf.http_default_deny_given)) {
287 err_msg = "permission denied";
288 goto err_out;
289 }
290 hc->status = HTTP_CONNECTED;
291 hc->cq = cq_new(MAX_BACKLOG);
292 numclients++;
293 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
294 hc->name, hc->fd);
295 para_list_add(&hc->node, &clients);
296 add_close_on_fork_list(hc->fd);
297 mark_fd_nonblocking(hc->fd);
298 return;
299 err_out:
300 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
301 hc->name, err_msg);
302 if (hc->fd > 0)
303 close(hc->fd);
304 free(hc);
305 }
306
307 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
308 {
309 struct http_client *hc, *tmp;
310
311 if (server_fd < 0)
312 return;
313 para_fd_set(server_fd, rfds, max_fileno);
314 list_for_each_entry_safe(hc, tmp, &clients, node) {
315 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
316 hc->check_r = 0;
317 hc->check_w = 0;
318 switch (hc->status) {
319 case HTTP_STREAMING:
320 case HTTP_READY_TO_STREAM:
321 break;
322 case HTTP_CONNECTED: /* need to recv get request */
323 para_fd_set(hc->fd, rfds, max_fileno);
324 hc->check_r = 1;
325 break;
326 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
327 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
328 para_fd_set(hc->fd, wfds, max_fileno);
329 hc->check_w = 1;
330 break;
331 case HTTP_SENT_OK_MSG:
332 if (!vss_playing())
333 break; /* wait until server starts playing */
334 para_fd_set(hc->fd, wfds, max_fileno);
335 hc->check_w = 1;
336 break;
337 }
338 }
339 }
340
341 static int open_tcp_port(int port)
342 {
343 int ret;
344
345 server_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
346 if (server_fd < 0) {
347 http_shutdown_clients();
348 self->status = SENDER_OFF;
349 return server_fd;
350 }
351 ret = mark_fd_nonblocking(server_fd);
352 if (ret < 0) {
353 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
354 exit(EXIT_FAILURE);
355 }
356 self->status = SENDER_ON;
357 add_close_on_fork_list(server_fd);
358 return 1;
359 }
360
361 static int http_com_on(__a_unused struct sender_command_data *scd)
362 {
363 if (self->status == SENDER_ON)
364 return 1;
365 return open_tcp_port(conf.http_port_arg);
366 }
367
368 static int http_com_off(__a_unused struct sender_command_data *scd)
369 {
370 self->status = SENDER_OFF;
371 if (server_fd > 0) {
372 close(server_fd);
373 del_close_on_fork_list(server_fd);
374 server_fd = -1;
375 }
376 http_shutdown_clients();
377 return 1;
378 }
379
380 static void del_perm_list_entry(struct sender_command_data *scd)
381 {
382 struct access_info *ai, *tmp;
383
384 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
385 char *nad = para_strdup(inet_ntoa(ai->addr));
386 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
387 ai->netmask == scd->netmask) {
388 PARA_NOTICE_LOG("removing %s/%i from access list\n",
389 nad, ai->netmask);
390 list_del(&ai->node);
391 free(ai);
392 }
393 free(nad);
394 }
395 }
396
397 static void add_perm_list_entry(struct sender_command_data *scd)
398 {
399 struct access_info *ai = para_malloc(sizeof(struct access_info));
400 ai->addr = scd->addr;
401 ai->netmask = scd->netmask;
402 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
403 ai->netmask);
404 para_list_add(&ai->node, &access_perm_list);
405 }
406
407 static int http_com_deny(struct sender_command_data *scd)
408 {
409 if (conf.http_default_deny_given)
410 del_perm_list_entry(scd);
411 else
412 add_perm_list_entry(scd);
413 return 1;
414 }
415
416 static int http_com_allow(struct sender_command_data *scd)
417 {
418 if (conf.http_default_deny_given)
419 add_perm_list_entry(scd);
420 else
421 del_perm_list_entry(scd);
422 return 1;
423 }
424
425 static char *http_info(void)
426 {
427 char *clnts = NULL, *ap = NULL, *ret;
428 struct access_info *ai, *tmp_ai;
429 struct http_client *hc, *tmp_hc;
430
431 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
432 char *tmp = make_message("%s%s/%d ", ap? ap : "",
433 inet_ntoa(ai->addr), ai->netmask);
434 free(ap);
435 ap = tmp;
436 }
437 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
438 char *tmp = make_message("%s%s ", clnts? clnts : "",
439 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 }