329071502f92f30d087bf2a5d62e466522d3e7f7
[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 #include "acl.h"
28
29 /** Message sent to clients that do not send a valid get request. */
30 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
31
32
33 /** The possible states of a client from the server's POV. */
34 enum http_status {
35 /** We accepted the connection on the tcp socket. */
36 HTTP_CONNECTED,
37 /** Successfully received the get request. */
38 HTTP_GOT_GET_REQUEST,
39 /** We sent the OK message back to the client. */
40 HTTP_SENT_OK_MSG,
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 http_acl;
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 /** non-zero if audio file header has been sent */
69 int header_sent;
70 /** The list of pending chunks for this client. */
71 struct chunk_queue *cq;
72 };
73
74 static int listen_fd = -1, numclients;
75 static struct sender *self;
76
77
78 static void http_shutdown_client(struct http_client *hc, const char *msg)
79 {
80 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc->name, hc->fd,
81 msg);
82 numclients--;
83 free(hc->name);
84 close(hc->fd);
85 del_close_on_fork_list(hc->fd);
86 cq_destroy(hc->cq);
87 list_del(&hc->node);
88 free(hc);
89 }
90
91 static void http_shutdown_clients(void)
92 {
93 struct http_client *hc, *tmp;
94 list_for_each_entry_safe(hc, tmp, &clients, node)
95 http_shutdown_client(hc, "vss request");
96 }
97
98 static int http_send_msg(struct http_client *hc, const char *msg)
99 {
100 int ret = send_buffer(hc->fd, msg);
101
102 if (ret < 0)
103 http_shutdown_client(hc, "send msg failed");
104 return ret;
105 }
106
107 static void http_send_ok_msg(struct http_client *hc)
108 {
109 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
110 http_send_msg(hc, HTTP_OK_MSG);
111 }
112
113 static int http_send_err_msg(struct http_client *hc)
114 {
115 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
116 return http_send_msg(hc, HTTP_ERR_MSG);
117 }
118
119 /*
120 * ret: Negative on errors, zero if nothing was written and write returned
121 * EAGAIN, number of bytes written else.
122 */
123 static int http_write(int fd, const char *buf, size_t len)
124 {
125 size_t written = 0;
126
127 while (written < len) {
128 int ret = write(fd, buf + written, len - written);
129 if (ret < 0 && errno == EAGAIN)
130 return written;
131 if (ret < 0)
132 return -ERRNO_TO_PARA_ERROR(errno);
133 written += ret;
134 }
135 return written;
136 }
137
138
139 static int send_queued_chunks(struct http_client *hc)
140 {
141 struct queued_chunk *qc;
142 while ((qc = cq_peek(hc->cq))) {
143 char *buf;
144 size_t len;
145 int ret;
146 cq_get(qc, &buf, &len);
147 ret = http_write(hc->fd, buf, len);
148 if (ret < 0)
149 return ret;
150 cq_update(hc->cq, ret);
151 if (ret != len)
152 return 1;
153 cq_dequeue(hc->cq);
154 }
155 return 1;
156 }
157
158 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
159 size_t sent)
160 {
161 int ret = cq_enqueue(hc->cq, chunk_num, sent);
162 if (ret < 0)
163 http_shutdown_client(hc, "queue error");
164 return ret;
165 }
166
167 static void http_send( long unsigned current_chunk,
168 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
169 {
170 struct http_client *hc, *tmp;
171 int ret;
172
173 list_for_each_entry_safe(hc, tmp, &clients, node) {
174 if (hc->status != HTTP_STREAMING)
175 continue;
176 if (!hc->header_sent && current_chunk) {
177 size_t hlen;
178 char *hbuf = vss_get_header(&hlen);
179 if (hbuf && hlen > 0) { /* need to send header */
180 PARA_INFO_LOG("queueing header: %zu\n", hlen);
181 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
182 continue;
183 } else
184 PARA_INFO_LOG("no need to queue header\n");
185 hc->header_sent = 1;
186 }
187 ret = send_queued_chunks(hc);
188 if (ret < 0) {
189 http_shutdown_client(hc, "queue send error");
190 continue;
191 }
192 if (!len)
193 continue;
194 if (!ret || write_ok(hc->fd) <= 0) {
195 queue_chunk_or_shutdown(hc, current_chunk, 0);
196 continue;
197 }
198 // PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
199 ret = write(hc->fd, buf, len);
200 // PARA_DEBUG_LOG("ret: %d\n", ret);
201 if (ret < 0) {
202 http_shutdown_client(hc, "send error");
203 continue;
204 }
205 if (ret != len)
206 queue_chunk_or_shutdown(hc, current_chunk, ret);
207 }
208 }
209
210 static void http_post_select(fd_set *rfds, fd_set *wfds)
211 {
212 int i = -1, match;
213 struct http_client *hc, *tmp;
214 const char *err_msg;
215
216 if (listen_fd < 0)
217 return;
218 list_for_each_entry_safe(hc, tmp, &clients, node) {
219 i++;
220 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
221 switch (hc->status) {
222 case HTTP_STREAMING: /* nothing to do */
223 break;
224 case HTTP_CONNECTED: /* need to recv get request */
225 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
226 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
227 < 0) {
228 hc->status = HTTP_INVALID_GET_REQUEST;
229 } else {
230 hc->status = HTTP_GOT_GET_REQUEST;
231 PARA_INFO_LOG("%s",
232 "received get request\n");
233 }
234 }
235 break;
236 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
237 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
238 hc->status = HTTP_SENT_OK_MSG;
239 http_send_ok_msg(hc);
240 }
241 break;
242 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
243 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
244 if (http_send_err_msg(hc) >= 0)
245 http_shutdown_client(hc,
246 "invalid get request");
247 }
248 break;
249 case HTTP_SENT_OK_MSG: /* need to send header? */
250 if (hc->check_w && FD_ISSET(hc->fd, wfds))
251 hc->status = HTTP_STREAMING;
252 break;
253 }
254 }
255 if (!FD_ISSET(listen_fd, rfds))
256 return;
257 hc = para_calloc(sizeof(struct http_client));
258 err_msg = "accept error";
259 hc->fd = para_accept(listen_fd, NULL, 0);
260 if (hc->fd <= 0)
261 goto err_out;
262 hc->name = make_message("%s", remote_name(hc->fd));
263 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
264 if (conf.http_max_clients_arg > 0 && numclients >=
265 conf.http_max_clients_arg) {
266 err_msg = "server full";
267 goto err_out;
268 }
269 match = acl_lookup(hc->fd, &http_acl);
270 PARA_DEBUG_LOG("acl lookup returned %d\n", match);
271 if ((match && !conf.http_default_deny_given) ||
272 (!match && conf.http_default_deny_given)) {
273 err_msg = "permission denied";
274 goto err_out;
275 }
276 err_msg = "failed to mark fd non-blocking";
277 if (mark_fd_nonblocking(hc->fd) < 0)
278 goto err_out;
279 hc->status = HTTP_CONNECTED;
280 hc->cq = cq_new(MAX_BACKLOG);
281 numclients++;
282 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
283 hc->name, hc->fd);
284 para_list_add(&hc->node, &clients);
285 add_close_on_fork_list(hc->fd);
286 return;
287 err_out:
288 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
289 hc->name, err_msg);
290 if (hc->fd > 0)
291 close(hc->fd);
292 free(hc);
293 }
294
295 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
296 {
297 struct http_client *hc, *tmp;
298
299 if (listen_fd < 0)
300 return;
301 para_fd_set(listen_fd, rfds, max_fileno);
302 list_for_each_entry_safe(hc, tmp, &clients, node) {
303 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
304 hc->check_r = 0;
305 hc->check_w = 0;
306 switch (hc->status) {
307 case HTTP_STREAMING:
308 break;
309 case HTTP_CONNECTED: /* need to recv get request */
310 para_fd_set(hc->fd, rfds, max_fileno);
311 hc->check_r = 1;
312 break;
313 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
314 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
315 para_fd_set(hc->fd, wfds, max_fileno);
316 hc->check_w = 1;
317 break;
318 case HTTP_SENT_OK_MSG:
319 if (!vss_playing())
320 break; /* wait until server starts playing */
321 para_fd_set(hc->fd, wfds, max_fileno);
322 hc->check_w = 1;
323 break;
324 }
325 }
326 }
327
328 static int http_open(void)
329 {
330 int ret;
331
332 listen_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, conf.http_port_arg);
333 if (listen_fd < 0)
334 return listen_fd;
335 ret = mark_fd_nonblocking(listen_fd);
336 if (ret < 0) {
337 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
338 exit(EXIT_FAILURE);
339 }
340 add_close_on_fork_list(listen_fd);
341 return 1;
342 }
343
344 static int http_com_on(__a_unused struct sender_command_data *scd)
345 {
346 if (listen_fd >= 0)
347 return 1;
348 return http_open();
349 }
350
351 static int http_com_off(__a_unused struct sender_command_data *scd)
352 {
353 if (listen_fd < 0)
354 return 1;
355 PARA_NOTICE_LOG("closing http port %d\n", conf.http_port_arg);
356 close(listen_fd);
357 del_close_on_fork_list(listen_fd);
358 http_shutdown_clients();
359 listen_fd = -1;
360 return 1;
361 }
362
363 static int http_com_deny(struct sender_command_data *scd)
364 {
365 if (conf.http_default_deny_given)
366 acl_del_entry(&http_acl, scd->addr, scd->netmask);
367 else
368 acl_add_entry(&http_acl, scd->addr, scd->netmask);
369 return 1;
370 }
371
372 static int http_com_allow(struct sender_command_data *scd)
373 {
374 if (conf.http_default_deny_given)
375 acl_add_entry(&http_acl, scd->addr, scd->netmask);
376 else
377 acl_del_entry(&http_acl, scd->addr, scd->netmask);
378 return 1;
379 }
380
381 static char *http_info(void)
382 {
383 char *clnts = NULL, *ret;
384 struct http_client *hc, *tmp_hc;
385
386 char *acl_contents = acl_get_contents(&http_acl);
387 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
388 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
389 free(clnts);
390 clnts = tmp;
391 }
392 ret = make_message(
393 "http status: %s\n"
394 "http tcp port: %d\n"
395 "http clients: %d\n"
396 "http maximal number of clients: %d%s\n"
397 "http connected clients: %s\n"
398 "http access %s list: %s\n",
399 (listen_fd >= 0)? "on" : "off",
400 conf.http_port_arg,
401 numclients,
402 conf.http_max_clients_arg,
403 conf.http_max_clients_arg > 0? "" : " (unlimited)",
404 clnts? clnts : "(none)",
405 conf.http_default_deny_given? "allow" : "deny",
406 acl_contents? acl_contents : "(none)"
407 );
408 free(acl_contents);
409 free(clnts);
410 return ret;
411 }
412
413 static char *http_help(void)
414 {
415 return make_message(
416 "usage: {on|off}\n"
417 "usage: {allow|deny} IP mask\n"
418 "example: allow 127.0.0.1 32\n"
419 );
420 }
421
422 /**
423 * The init function of the http sender.
424 *
425 * \param s Pointer to the http sender struct.
426 *
427 * It initializes all function pointers of \a s, the client list and the access
428 * control list. If the autostart option was given, the tcp port is opened.
429 */
430 void http_send_init(struct sender *s)
431 {
432 INIT_LIST_HEAD(&clients);
433 s->info = http_info;
434 s->send = http_send;
435 s->pre_select = http_pre_select;
436 s->post_select = http_post_select;
437 s->shutdown_clients = http_shutdown_clients;
438 s->help = http_help;
439 s->client_cmds[SENDER_ON] = http_com_on;
440 s->client_cmds[SENDER_OFF] = http_com_off;
441 s->client_cmds[SENDER_DENY] = http_com_deny;
442 s->client_cmds[SENDER_ALLOW] = http_com_allow;
443 s->client_cmds[SENDER_ADD] = NULL;
444 s->client_cmds[SENDER_DELETE] = NULL;
445 self = s;
446 acl_init(&http_acl, conf.http_access_arg, conf.http_access_given);
447 if (!conf.http_no_autostart_given)
448 http_open(); /* ignore errors */
449 PARA_DEBUG_LOG("%s", "http sender init complete\n");
450 }