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