http_send: Make add_perm_list_entry() and del_perm_list_entry() generic.
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2008 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 http_acl;
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 acl. */
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 /**
206 * Return true if addr_1 matches addr_2 in the first `netmask' bits.
207 */
208 static int v4_addr_match(uint32_t addr_1, uint32_t addr_2, uint8_t netmask)
209 {
210 uint32_t mask = ~0U;
211
212 if (netmask < 32)
213 mask <<= (32 - netmask);
214 return (htonl(addr_1) & mask) == (htonl(addr_2) & mask);
215 }
216
217 static int host_in_acl(int fd, struct list_head *acl)
218 {
219 struct access_info *ai, *tmp;
220 struct sockaddr_storage ss;
221 socklen_t sslen = sizeof(ss);
222 struct in_addr v4_addr;
223
224 if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
225 PARA_ERROR_LOG("Can not determine peer address: %s\n", strerror(errno));
226 goto no_match;
227 }
228 v4_addr = extract_v4_addr(&ss);
229 if (!v4_addr.s_addr)
230 goto no_match;
231
232 list_for_each_entry_safe(ai, tmp, acl, node)
233 if (v4_addr_match(v4_addr.s_addr, ai->addr.s_addr, ai->netmask))
234 return 1;
235 no_match:
236 return 0;
237 }
238
239 static void http_post_select(fd_set *rfds, fd_set *wfds)
240 {
241 int i = -1, match;
242 struct http_client *hc, *tmp;
243 const char *err_msg;
244
245 list_for_each_entry_safe(hc, tmp, &clients, node) {
246 i++;
247 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
248 switch (hc->status) {
249 case HTTP_STREAMING: /* nothing to do */
250 case HTTP_READY_TO_STREAM:
251 break;
252 case HTTP_CONNECTED: /* need to recv get request */
253 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
254 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
255 < 0) {
256 hc->status = HTTP_INVALID_GET_REQUEST;
257 } else {
258 hc->status = HTTP_GOT_GET_REQUEST;
259 PARA_INFO_LOG("%s",
260 "received get request\n");
261 }
262 }
263 break;
264 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
265 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
266 hc->status = HTTP_SENT_OK_MSG;
267 http_send_ok_msg(hc);
268 }
269 break;
270 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
271 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
272 if (http_send_err_msg(hc) >= 0)
273 http_shutdown_client(hc,
274 "invalid get request");
275 }
276 break;
277 case HTTP_SENT_OK_MSG: /* need to send header? */
278 if (hc->check_w && FD_ISSET(hc->fd, wfds))
279 hc->status = HTTP_READY_TO_STREAM;
280 break;
281 }
282 }
283 if (!FD_ISSET(server_fd, rfds))
284 return;
285 hc = para_calloc(sizeof(struct http_client));
286 err_msg = "accept error";
287 hc->fd = para_accept(server_fd, NULL, 0);
288 if (hc->fd <= 0)
289 goto err_out;
290 hc->name = make_message("%s", remote_name(hc->fd));
291 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
292 if (conf.http_max_clients_arg > 0 && numclients >=
293 conf.http_max_clients_arg) {
294 err_msg = "server full";
295 goto err_out;
296 }
297 match = host_in_acl(hc->fd, &http_acl);
298 PARA_DEBUG_LOG("host_in_acl: %d\n", match);
299 if ((match && !conf.http_default_deny_given) ||
300 (!match && conf.http_default_deny_given)) {
301 err_msg = "permission denied";
302 goto err_out;
303 }
304 hc->status = HTTP_CONNECTED;
305 hc->cq = cq_new(MAX_BACKLOG);
306 numclients++;
307 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
308 hc->name, hc->fd);
309 para_list_add(&hc->node, &clients);
310 add_close_on_fork_list(hc->fd);
311 mark_fd_nonblocking(hc->fd);
312 return;
313 err_out:
314 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
315 hc->name, err_msg);
316 if (hc->fd > 0)
317 close(hc->fd);
318 free(hc);
319 }
320
321 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
322 {
323 struct http_client *hc, *tmp;
324
325 if (server_fd < 0)
326 return;
327 para_fd_set(server_fd, rfds, max_fileno);
328 list_for_each_entry_safe(hc, tmp, &clients, node) {
329 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
330 hc->check_r = 0;
331 hc->check_w = 0;
332 switch (hc->status) {
333 case HTTP_STREAMING:
334 case HTTP_READY_TO_STREAM:
335 break;
336 case HTTP_CONNECTED: /* need to recv get request */
337 para_fd_set(hc->fd, rfds, max_fileno);
338 hc->check_r = 1;
339 break;
340 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
341 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
342 para_fd_set(hc->fd, wfds, max_fileno);
343 hc->check_w = 1;
344 break;
345 case HTTP_SENT_OK_MSG:
346 if (!vss_playing())
347 break; /* wait until server starts playing */
348 para_fd_set(hc->fd, wfds, max_fileno);
349 hc->check_w = 1;
350 break;
351 }
352 }
353 }
354
355 static int open_tcp_port(int port)
356 {
357 int ret;
358
359 server_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
360 if (server_fd < 0) {
361 http_shutdown_clients();
362 self->status = SENDER_OFF;
363 return server_fd;
364 }
365 ret = mark_fd_nonblocking(server_fd);
366 if (ret < 0) {
367 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
368 exit(EXIT_FAILURE);
369 }
370 self->status = SENDER_ON;
371 add_close_on_fork_list(server_fd);
372 return 1;
373 }
374
375 static int http_com_on(__a_unused struct sender_command_data *scd)
376 {
377 if (self->status == SENDER_ON)
378 return 1;
379 return open_tcp_port(conf.http_port_arg);
380 }
381
382 static int http_com_off(__a_unused struct sender_command_data *scd)
383 {
384 self->status = SENDER_OFF;
385 if (server_fd > 0) {
386 close(server_fd);
387 del_close_on_fork_list(server_fd);
388 server_fd = -1;
389 }
390 http_shutdown_clients();
391 return 1;
392 }
393
394 static void del_acl_entry(struct list_head *acl, struct in_addr addr,
395 int netmask)
396 {
397 struct access_info *ai, *tmp;
398
399 list_for_each_entry_safe(ai, tmp, acl, node) {
400 char *nad = para_strdup(inet_ntoa(ai->addr));
401 if (!strcmp(nad, inet_ntoa(addr)) &&
402 ai->netmask == netmask) {
403 PARA_NOTICE_LOG("removing %s/%i from access list\n",
404 nad, ai->netmask);
405 list_del(&ai->node);
406 free(ai);
407 }
408 free(nad);
409 }
410 }
411
412 static void add_acl_entry(struct list_head *acl, struct in_addr addr,
413 int netmask)
414 {
415 struct access_info *ai = para_malloc(sizeof(struct access_info));
416 ai->addr = addr;
417 ai->netmask = netmask;
418 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
419 ai->netmask);
420 para_list_add(&ai->node, acl);
421 }
422
423 static int http_com_deny(struct sender_command_data *scd)
424 {
425 if (conf.http_default_deny_given)
426 del_acl_entry(&http_acl, scd->addr, scd->netmask);
427 else
428 add_acl_entry(&http_acl, scd->addr, scd->netmask);
429 return 1;
430 }
431
432 static int http_com_allow(struct sender_command_data *scd)
433 {
434 if (conf.http_default_deny_given)
435 add_acl_entry(&http_acl, scd->addr, scd->netmask);
436 else
437 del_acl_entry(&http_acl, scd->addr, scd->netmask);
438 return 1;
439 }
440
441 static char *get_acl_contents(struct list_head *acl)
442 {
443 struct access_info *ai, *tmp_ai;
444 char *ret = NULL;
445
446 list_for_each_entry_safe(ai, tmp_ai, acl, node) {
447 char *tmp = make_message("%s%s/%d ", ret? ret : "",
448 inet_ntoa(ai->addr), ai->netmask);
449 free(ret);
450 ret = tmp;
451 }
452 return ret;
453 }
454
455 static char *http_info(void)
456 {
457 char *clnts = NULL, *ret;
458 struct http_client *hc, *tmp_hc;
459
460 char *acl_contents = get_acl_contents(&http_acl);
461 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
462 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
463 free(clnts);
464 clnts = tmp;
465 }
466 ret = make_message(
467 "http status: %s\n"
468 "http tcp port: %d\n"
469 "http clients: %d\n"
470 "http maximal number of clients: %d%s\n"
471 "http connected clients: %s\n"
472 "http access %s list: %s\n",
473 (self->status == SENDER_ON)? "on" : "off",
474 conf.http_port_arg,
475 numclients,
476 conf.http_max_clients_arg,
477 conf.http_max_clients_arg > 0? "" : " (unlimited)",
478 clnts? clnts : "(none)",
479 conf.http_default_deny_given? "allow" : "deny",
480 acl_contents? acl_contents : "(none)"
481 );
482 free(acl_contents);
483 free(clnts);
484 return ret;
485 }
486
487 static void init_acl(struct list_head *acl, char * const *acl_info, int num)
488 {
489 int i;
490
491 INIT_LIST_HEAD(acl);
492 for (i = 0; i < num; i++) {
493 char *arg = para_strdup(acl_info[i]);
494 char *p = strchr(arg, '/');
495 struct in_addr addr;
496 int netmask;
497
498 if (!p)
499 goto err;
500 *p = '\0';
501 if (!inet_pton(AF_INET, arg, &addr))
502 goto err;
503 netmask = atoi(++p);
504 if (netmask < 0 || netmask > 32)
505 goto err;
506 add_acl_entry(acl, addr, netmask);
507 goto success;
508 err:
509 PARA_CRIT_LOG("syntax error: %s\n", acl_info[i]);
510 success:
511 free(arg);
512 continue;
513 }
514 }
515
516 static char *http_help(void)
517 {
518 return make_message(
519 "usage: {on|off}\n"
520 "usage: {allow|deny} IP mask\n"
521 "example: allow 127.0.0.1 32\n"
522 );
523 }
524
525 /**
526 * The init function of the http sender.
527 *
528 * \param s Pointer to the http sender struct.
529 *
530 * It initializes all function pointers of \a s, the client list and the access
531 * control list. If the autostart option was given, the tcp port is opened.
532 */
533 void http_send_init(struct sender *s)
534 {
535 INIT_LIST_HEAD(&clients);
536 s->info = http_info;
537 s->send = http_send;
538 s->pre_select = http_pre_select;
539 s->post_select = http_post_select;
540 s->shutdown_clients = http_shutdown_clients;
541 s->help = http_help;
542 s->client_cmds[SENDER_ON] = http_com_on;
543 s->client_cmds[SENDER_OFF] = http_com_off;
544 s->client_cmds[SENDER_DENY] = http_com_deny;
545 s->client_cmds[SENDER_ALLOW] = http_com_allow;
546 s->client_cmds[SENDER_ADD] = NULL;
547 s->client_cmds[SENDER_DELETE] = NULL;
548 self = s;
549 init_acl(&http_acl, conf.http_access_arg, conf.http_access_given);
550 if (!conf.http_no_autostart_given)
551 open_tcp_port(conf.http_port_arg); /* ignore errors */
552 PARA_DEBUG_LOG("%s", "http sender init complete\n");
553 }