69e75ccb80eddd0badfdf49aadaadcf6e75e8417
[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 established, we might need to send the audio file header. */
42 HTTP_READY_TO_STREAM,
43 /** Connection is ready for sending audio data. */
44 HTTP_STREAMING,
45 /** We didn't receive a valid get request. */
46 HTTP_INVALID_GET_REQUEST
47 };
48
49 /** Clients will be kicked if there are more than that many bytes pending. */
50 #define MAX_BACKLOG 400000
51 /** The list of connected clients. */
52 static struct list_head clients;
53 /** The whitelist/blacklist. */
54 static struct list_head http_acl;
55
56 /** Describes one client that connected the tcp port of the http sender. */
57 struct http_client {
58 /** The file descriptor of the client. */
59 int fd;
60 /** The socket `name' of the client. */
61 char *name;
62 /** The client's current status. */
63 enum http_status status;
64 /** Non-zero if we included \a fd in the read set.*/
65 int check_r;
66 /** Non-zero if we included \a fd in the write set. */
67 int check_w;
68 /** The position of this client in the client list. */
69 struct list_head node;
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 static int send_queued_chunks(struct http_client *hc)
120 {
121 struct queued_chunk *qc;
122 while ((qc = cq_peek(hc->cq))) {
123 char *buf;
124 size_t len;
125 int ret = write_ok(hc->fd);
126 if (ret <= 0)
127 return ret? -E_WRITE_OK : 0;
128 cq_get(qc, &buf, &len);
129 ret = write(hc->fd, buf, len);
130 if (ret < 0)
131 return -E_SEND_QUEUED_CHUNK;
132 cq_update(hc->cq, ret);
133 if (ret != len)
134 return 1;
135 cq_dequeue(hc->cq);
136 }
137 return 1;
138 }
139
140 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
141 size_t sent)
142 {
143 int ret = cq_enqueue(hc->cq, chunk_num, sent);
144 if (ret < 0)
145 http_shutdown_client(hc, "queue error");
146 return ret;
147 }
148
149 static void http_send( long unsigned current_chunk,
150 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
151 {
152 struct http_client *hc, *tmp;
153 int ret;
154
155 list_for_each_entry_safe(hc, tmp, &clients, node) {
156 if (hc->status != HTTP_STREAMING &&
157 hc->status != HTTP_READY_TO_STREAM)
158 continue;
159 if (hc->status == HTTP_READY_TO_STREAM) {
160 size_t hlen;
161 char *hbuf = vss_get_header(&hlen);
162 if (hbuf && hlen > 0 && current_chunk) {
163 /* need to send header */
164 PARA_INFO_LOG("queueing header: %zu\n", hlen);
165 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
166 continue;
167 } else
168 PARA_INFO_LOG("no need to queue header\n");
169 hc->status = HTTP_STREAMING;
170 }
171 ret = send_queued_chunks(hc);
172 if (ret < 0) {
173 http_shutdown_client(hc, "queue send error");
174 continue;
175 }
176 if (!len)
177 continue;
178 if (!ret || write_ok(hc->fd) <= 0) {
179 queue_chunk_or_shutdown(hc, current_chunk, 0);
180 continue;
181 }
182 // PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
183 ret = write(hc->fd, buf, len);
184 // PARA_DEBUG_LOG("ret: %d\n", ret);
185 if (ret < 0) {
186 http_shutdown_client(hc, "send error");
187 continue;
188 }
189 if (ret != len)
190 queue_chunk_or_shutdown(hc, current_chunk, ret);
191 }
192 }
193
194 static void http_post_select(fd_set *rfds, fd_set *wfds)
195 {
196 int i = -1, match;
197 struct http_client *hc, *tmp;
198 const char *err_msg;
199
200 if (listen_fd < 0)
201 return;
202 list_for_each_entry_safe(hc, tmp, &clients, node) {
203 i++;
204 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
205 switch (hc->status) {
206 case HTTP_STREAMING: /* nothing to do */
207 case HTTP_READY_TO_STREAM:
208 break;
209 case HTTP_CONNECTED: /* need to recv get request */
210 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
211 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
212 < 0) {
213 hc->status = HTTP_INVALID_GET_REQUEST;
214 } else {
215 hc->status = HTTP_GOT_GET_REQUEST;
216 PARA_INFO_LOG("%s",
217 "received get request\n");
218 }
219 }
220 break;
221 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
222 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
223 hc->status = HTTP_SENT_OK_MSG;
224 http_send_ok_msg(hc);
225 }
226 break;
227 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
228 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
229 if (http_send_err_msg(hc) >= 0)
230 http_shutdown_client(hc,
231 "invalid get request");
232 }
233 break;
234 case HTTP_SENT_OK_MSG: /* need to send header? */
235 if (hc->check_w && FD_ISSET(hc->fd, wfds))
236 hc->status = HTTP_READY_TO_STREAM;
237 break;
238 }
239 }
240 if (!FD_ISSET(listen_fd, rfds))
241 return;
242 hc = para_calloc(sizeof(struct http_client));
243 err_msg = "accept error";
244 hc->fd = para_accept(listen_fd, NULL, 0);
245 if (hc->fd <= 0)
246 goto err_out;
247 hc->name = make_message("%s", remote_name(hc->fd));
248 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
249 if (conf.http_max_clients_arg > 0 && numclients >=
250 conf.http_max_clients_arg) {
251 err_msg = "server full";
252 goto err_out;
253 }
254 match = acl_lookup(hc->fd, &http_acl);
255 PARA_DEBUG_LOG("acl lookup returned %d\n", match);
256 if ((match && !conf.http_default_deny_given) ||
257 (!match && conf.http_default_deny_given)) {
258 err_msg = "permission denied";
259 goto err_out;
260 }
261 err_msg = "failed to mark fd non-blocking";
262 if (mark_fd_nonblocking(hc->fd) < 0)
263 goto err_out;
264 hc->status = HTTP_CONNECTED;
265 hc->cq = cq_new(MAX_BACKLOG);
266 numclients++;
267 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
268 hc->name, hc->fd);
269 para_list_add(&hc->node, &clients);
270 add_close_on_fork_list(hc->fd);
271 return;
272 err_out:
273 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
274 hc->name, err_msg);
275 if (hc->fd > 0)
276 close(hc->fd);
277 free(hc);
278 }
279
280 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
281 {
282 struct http_client *hc, *tmp;
283
284 if (listen_fd < 0)
285 return;
286 para_fd_set(listen_fd, rfds, max_fileno);
287 list_for_each_entry_safe(hc, tmp, &clients, node) {
288 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
289 hc->check_r = 0;
290 hc->check_w = 0;
291 switch (hc->status) {
292 case HTTP_STREAMING:
293 case HTTP_READY_TO_STREAM:
294 break;
295 case HTTP_CONNECTED: /* need to recv get request */
296 para_fd_set(hc->fd, rfds, max_fileno);
297 hc->check_r = 1;
298 break;
299 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
300 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
301 para_fd_set(hc->fd, wfds, max_fileno);
302 hc->check_w = 1;
303 break;
304 case HTTP_SENT_OK_MSG:
305 if (!vss_playing())
306 break; /* wait until server starts playing */
307 para_fd_set(hc->fd, wfds, max_fileno);
308 hc->check_w = 1;
309 break;
310 }
311 }
312 }
313
314 static int http_open(void)
315 {
316 int ret;
317
318 listen_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, conf.http_port_arg);
319 if (listen_fd < 0)
320 return listen_fd;
321 ret = mark_fd_nonblocking(listen_fd);
322 if (ret < 0) {
323 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
324 exit(EXIT_FAILURE);
325 }
326 add_close_on_fork_list(listen_fd);
327 return 1;
328 }
329
330 static int http_com_on(__a_unused struct sender_command_data *scd)
331 {
332 if (listen_fd >= 0)
333 return 1;
334 return http_open();
335 }
336
337 static int http_com_off(__a_unused struct sender_command_data *scd)
338 {
339 if (listen_fd < 0)
340 return 1;
341 PARA_NOTICE_LOG("closing http port %d\n", conf.http_port_arg);
342 close(listen_fd);
343 del_close_on_fork_list(listen_fd);
344 http_shutdown_clients();
345 listen_fd = -1;
346 return 1;
347 }
348
349 static int http_com_deny(struct sender_command_data *scd)
350 {
351 if (conf.http_default_deny_given)
352 acl_del_entry(&http_acl, scd->addr, scd->netmask);
353 else
354 acl_add_entry(&http_acl, scd->addr, scd->netmask);
355 return 1;
356 }
357
358 static int http_com_allow(struct sender_command_data *scd)
359 {
360 if (conf.http_default_deny_given)
361 acl_add_entry(&http_acl, scd->addr, scd->netmask);
362 else
363 acl_del_entry(&http_acl, scd->addr, scd->netmask);
364 return 1;
365 }
366
367 static char *http_info(void)
368 {
369 char *clnts = NULL, *ret;
370 struct http_client *hc, *tmp_hc;
371
372 char *acl_contents = acl_get_contents(&http_acl);
373 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
374 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
375 free(clnts);
376 clnts = tmp;
377 }
378 ret = make_message(
379 "http status: %s\n"
380 "http tcp port: %d\n"
381 "http clients: %d\n"
382 "http maximal number of clients: %d%s\n"
383 "http connected clients: %s\n"
384 "http access %s list: %s\n",
385 (listen_fd >= 0)? "on" : "off",
386 conf.http_port_arg,
387 numclients,
388 conf.http_max_clients_arg,
389 conf.http_max_clients_arg > 0? "" : " (unlimited)",
390 clnts? clnts : "(none)",
391 conf.http_default_deny_given? "allow" : "deny",
392 acl_contents? acl_contents : "(none)"
393 );
394 free(acl_contents);
395 free(clnts);
396 return ret;
397 }
398
399 static char *http_help(void)
400 {
401 return make_message(
402 "usage: {on|off}\n"
403 "usage: {allow|deny} IP mask\n"
404 "example: allow 127.0.0.1 32\n"
405 );
406 }
407
408 /**
409 * The init function of the http sender.
410 *
411 * \param s Pointer to the http sender struct.
412 *
413 * It initializes all function pointers of \a s, the client list and the access
414 * control list. If the autostart option was given, the tcp port is opened.
415 */
416 void http_send_init(struct sender *s)
417 {
418 INIT_LIST_HEAD(&clients);
419 s->info = http_info;
420 s->send = http_send;
421 s->pre_select = http_pre_select;
422 s->post_select = http_post_select;
423 s->shutdown_clients = http_shutdown_clients;
424 s->help = http_help;
425 s->client_cmds[SENDER_ON] = http_com_on;
426 s->client_cmds[SENDER_OFF] = http_com_off;
427 s->client_cmds[SENDER_DENY] = http_com_deny;
428 s->client_cmds[SENDER_ALLOW] = http_com_allow;
429 s->client_cmds[SENDER_ADD] = NULL;
430 s->client_cmds[SENDER_DELETE] = NULL;
431 self = s;
432 acl_init(&http_acl, conf.http_access_arg, conf.http_access_given);
433 if (!conf.http_no_autostart_given)
434 http_open(); /* ignore errors */
435 PARA_DEBUG_LOG("%s", "http sender init complete\n");
436 }