http_send: shutdown clients even if status is not yet HTTP_STREAMING
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file http_send.c paraslash's http sender */
20
21
22 #include "server.cmdline.h"
23 #include "server.h"
24 #include "http.h"
25 #include "afs.h"
26 #include "send.h"
27 #include "list.h"
28 #include "close_on_fork.h"
29 #include "error.h"
30 #include "net.h"
31 #include "string.h"
32 #include "fd.h"
33
34 /** \cond convert sock_addr_in to ascii */
35 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
36 /* get the port number of a struct http_client */
37 #define CLIENT_PORT(hc) (hc)->addr.sin_port
38 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
39 /** \endcond */
40
41 extern struct gengetopt_args_info conf;
42
43 /** the possible states of a client from the server's POV */
44 enum http_status {
45 HTTP_CONNECTED,
46 HTTP_GOT_GET_REQUEST,
47 HTTP_SENT_OK_MSG,
48 HTTP_READY_TO_STREAM,
49 HTTP_STREAMING,
50 HTTP_INVALID_GET_REQUEST
51 };
52
53 /** clients will be kicked if there are more than that many bytes pending */
54 #define MAX_BACKLOG 40000
55 /** the list of connected clients **/
56 static struct list_head clients;
57 /** the whitelist/blacklist */
58 static struct list_head access_perm_list;
59
60 /** describes one client that connected the tcp port of the http sender */
61 struct http_client {
62 /** the file descriptor of the client */
63 int fd;
64 /** address information about the client */
65 struct sockaddr_in addr;
66 /** the client's current status */
67 enum http_status status;
68 /** non-zero if we included \a fd in the read set */
69 int check_r;
70 /** non-zero if we included \a fd in the write set */
71 int check_w;
72 /** the position of this client in the client list */
73 struct list_head node;
74 /** the list of pending packets for this client */
75 struct list_head packet_queue;
76 /** the number of pending bytes for this client */
77 unsigned long pq_bytes;
78 };
79
80 /**
81 * describes one queued data packet for a client
82 *
83 * The send function of the http sender checks each client fd for writing. If a
84 * client fd is not ready, it tries to queue that packet for this client until
85 * the number of queued bytes exceeds \p MAX_BACKLOG.
86 */
87 struct queued_packet {
88 /** the length of the packet in bytes */
89 unsigned int len;
90 /** pointer to the packet data */
91 char *packet;
92 /** position of the packet in the packet list */
93 struct list_head node;
94 };
95
96 /**
97 * describes one entry in the blacklist/whitelist of the http sender
98 */
99 struct access_info {
100 /** the address to be black/whitelisted */
101 struct in_addr addr;
102 /** the netmask for this entry */
103 int netmask;
104 /** the position of this entry in the access_perm_list */
105 struct list_head node;
106 };
107
108 static int server_fd = -1, numclients;
109 static struct sender *self;
110
111
112 static void http_shutdown_client(struct http_client *hc, const char *msg)
113 {
114 struct queued_packet *qp, *tmp;
115 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
116 hc->fd, msg);
117 numclients--;
118 close(hc->fd);
119
120 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
121 free(qp->packet);
122 list_del(&qp->node);
123 free(qp);
124 }
125 list_del(&hc->node);
126 free(hc);
127 }
128
129 static void http_shutdown_clients_real(void)
130 {
131 struct http_client *hc, *tmp;
132 list_for_each_entry_safe(hc, tmp, &clients, node)
133 http_shutdown_client(hc, "afs request");
134 }
135 static void http_shutdown_clients(void)
136 {
137 struct http_client *hc, *tmp;
138 list_for_each_entry_safe(hc, tmp, &clients, node)
139 http_shutdown_client(hc, "afs request");
140 }
141
142 static int http_send_msg(struct http_client *hc, const char *msg)
143 {
144 int ret = send_buffer(hc->fd, msg);
145
146 if (ret < 0)
147 http_shutdown_client(hc, "send msg failed");
148 return ret;
149 }
150
151 static void http_send_ok_msg(struct http_client *hc)
152 {
153 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
154 http_send_msg(hc, HTTP_OK_MSG);
155 }
156
157 static int http_send_err_msg(struct http_client *hc)
158 {
159 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
160 return http_send_msg(hc, HTTP_ERR_MSG);
161 }
162
163 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
164 {
165 struct queued_packet *qp;
166 if (hc->pq_bytes + len > MAX_BACKLOG) {
167 http_shutdown_client(hc, "packet queue overrun");
168 return -E_QUEUE;
169 }
170 qp = para_malloc(sizeof(struct queued_packet));
171 hc->pq_bytes += len;
172 qp->packet = para_malloc(len);
173 memcpy(qp->packet, buf, len);
174 qp->len = len;
175 list_add_tail(&qp->node, &hc->packet_queue);
176 PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
177 return 1;
178 }
179
180 static int send_queued_packets(struct http_client *hc)
181 {
182 int ret;
183 struct queued_packet *qp, *tmp;
184
185 if (list_empty(&hc->packet_queue))
186 return 1;
187 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
188 ret = write_ok(hc->fd);
189 if (ret <= 0)
190 return ret? -E_WRITE_OK : 0;
191 ret = write(hc->fd, qp->packet, qp->len);
192 if (ret < 0)
193 return ret;
194 if (ret != qp->len) {
195 qp->len -= ret;
196 memmove(qp->packet, qp->packet + ret, qp->len);
197 return 0;
198 }
199 hc->pq_bytes -= qp->len;
200 free(qp->packet);
201 list_del(&qp->node);
202 free(qp);
203 }
204 return 1;
205 }
206
207 static void http_send( long unsigned current_chunk,
208 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
209 {
210 struct http_client *hc, *tmp;
211 int ret;
212
213 list_for_each_entry_safe(hc, tmp, &clients, node) {
214 if (hc->status != HTTP_STREAMING &&
215 hc->status != HTTP_READY_TO_STREAM)
216 continue;
217 if (hc->status == HTTP_READY_TO_STREAM) {
218 int hlen;
219 char *buf = afs_get_header(&hlen);
220 if (buf && hlen > 0 && current_chunk) {
221 /* need to send header */
222 PARA_INFO_LOG("queueing header: %d\n", hlen);
223 if (queue_packet(hc, buf, hlen) < 0)
224 continue;
225 } else
226 PARA_INFO_LOG("%s", "no need to queue header\n");
227 hc->status = HTTP_STREAMING;
228 }
229 ret = send_queued_packets(hc);
230 if (ret < 0) {
231 http_shutdown_client(hc, "send error");
232 continue;
233 }
234 if (!len)
235 continue;
236 if (!ret || write_ok(hc->fd) <= 0) {
237 PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
238 " trying to queue packet\n", hc->fd,
239 hc->pq_bytes);
240 queue_packet(hc, buf, len);
241 continue;
242 }
243 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
244 ret = write(hc->fd, buf, len);
245 if (ret < 0) {
246 http_shutdown_client(hc, "send error");
247 continue;
248 }
249 if (ret != len)
250 queue_packet(hc, buf + ret, len - ret);
251 }
252 }
253
254 static int host_in_access_perm_list(struct http_client *hc)
255 {
256 struct access_info *ai, *tmp;
257 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
258 unsigned mask = ((~0) >> ai->netmask);
259 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
260 return 1;
261 }
262 return 0;
263 }
264
265 static void http_post_select(fd_set *rfds, fd_set *wfds)
266 {
267 int i = -1, match;
268 struct http_client *hc, *tmp;
269 const char *err_msg;
270
271 list_for_each_entry_safe(hc, tmp, &clients, node) {
272 i++;
273 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
274 switch (hc->status) {
275 case HTTP_STREAMING: /* nothing to do */
276 case HTTP_READY_TO_STREAM:
277 break;
278 case HTTP_CONNECTED: /* need to recv get request */
279 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
280 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
281 < 0) {
282 hc->status = HTTP_INVALID_GET_REQUEST;
283 } else {
284 hc->status = HTTP_GOT_GET_REQUEST;
285 PARA_INFO_LOG("%s",
286 "received get request\n");
287 }
288 }
289 break;
290 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
291 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
292 hc->status = HTTP_SENT_OK_MSG;
293 http_send_ok_msg(hc);
294 }
295 break;
296 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
297 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
298 if (http_send_err_msg(hc) >= 0)
299 http_shutdown_client(hc,
300 "invalid get request");
301 }
302 break;
303 case HTTP_SENT_OK_MSG: /* need to send header? */
304 if (hc->check_w && FD_ISSET(hc->fd, wfds))
305 hc->status = HTTP_READY_TO_STREAM;
306 break;
307 }
308 }
309 if (!FD_ISSET(server_fd, rfds))
310 return;
311 hc = para_calloc(sizeof(struct http_client));
312 err_msg = "accept error";
313 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
314 if (hc->fd <= 0)
315 goto err_out;
316 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
317 if (conf.http_max_clients_arg > 0 && numclients >=
318 conf.http_max_clients_arg) {
319 err_msg = "server full";
320 goto err_out;
321 }
322 match = host_in_access_perm_list(hc);
323 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
324 if ((match && !conf.http_default_deny_given) ||
325 (!match && conf.http_default_deny_given)) {
326 err_msg = "permission denied";
327 goto err_out;
328 }
329 hc->status = HTTP_CONNECTED;
330 INIT_LIST_HEAD(&hc->packet_queue);
331 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
332 CLIENT_ADDR(hc), hc->fd);
333 numclients++;
334 list_add(&hc->node, &clients);
335 return;
336 err_out:
337 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
338 CLIENT_ADDR(hc), err_msg);
339 if (hc->fd > 0)
340 close(hc->fd);
341 free(hc);
342 }
343
344 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
345 {
346 struct http_client *hc, *tmp;
347
348 if (server_fd < 0)
349 return;
350 para_fd_set(server_fd, rfds, max_fileno);
351 list_for_each_entry_safe(hc, tmp, &clients, node) {
352 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
353 hc->check_r = 0;
354 hc->check_w = 0;
355 switch (hc->status) {
356 case HTTP_STREAMING:
357 case HTTP_READY_TO_STREAM:
358 break;
359 case HTTP_CONNECTED: /* need to recv get request */
360 para_fd_set(hc->fd, rfds, max_fileno);
361 hc->check_r = 1;
362 break;
363 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
364 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
365 para_fd_set(hc->fd, wfds, max_fileno);
366 hc->check_w = 1;
367 break;
368 case HTTP_SENT_OK_MSG:
369 if (!afs_playing())
370 break; /* wait until server starts playing */
371 para_fd_set(hc->fd, wfds, max_fileno);
372 hc->check_w = 1;
373 break;
374 }
375 }
376 }
377
378 static int open_tcp_port(int port)
379 {
380 server_fd = init_tcp_socket(port);
381 if (server_fd < 0) {
382 http_shutdown_clients_real();
383 self->status = SENDER_OFF;
384 return server_fd;
385 }
386 self->status = SENDER_ON;
387 add_close_on_fork_list(server_fd);
388 return 1;
389 }
390
391 static int http_com_on(__a_unused struct sender_command_data *scd)
392 {
393 if (self->status == SENDER_ON)
394 return 1;
395 return open_tcp_port(conf.http_port_arg);
396 }
397
398 static int http_com_off(__a_unused struct sender_command_data *scd)
399 {
400 self->status = SENDER_OFF;
401 if (server_fd > 0) {
402 close(server_fd);
403 del_close_on_fork_list(server_fd);
404 server_fd = -1;
405 }
406 http_shutdown_clients_real();
407 return 1;
408 }
409
410 static void del_perm_list_entry(struct sender_command_data *scd)
411 {
412 struct access_info *ai, *tmp;
413
414 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
415 char *nad = para_strdup(inet_ntoa(ai->addr));
416 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
417 ai->netmask == scd->netmask) {
418 PARA_NOTICE_LOG("removing %s/%i from access list\n",
419 nad, ai->netmask);
420 list_del(&ai->node);
421 free(ai);
422 }
423 free(nad);
424 }
425 }
426
427 static void add_perm_list_entry(struct sender_command_data *scd)
428 {
429 struct access_info *ai = para_malloc(sizeof(struct access_info));
430 ai->addr = scd->addr;
431 ai->netmask = scd->netmask;
432 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
433 ai->netmask);
434 list_add(&ai->node, &access_perm_list);
435 }
436
437 static int http_com_deny(struct sender_command_data *scd)
438 {
439 if (conf.http_default_deny_given)
440 del_perm_list_entry(scd);
441 else
442 add_perm_list_entry(scd);
443 return 1;
444 }
445
446 static int http_com_allow(struct sender_command_data *scd)
447 {
448 if (conf.http_default_deny_given)
449 add_perm_list_entry(scd);
450 else
451 del_perm_list_entry(scd);
452 return 1;
453 }
454
455 static char *http_info(void)
456 {
457 char *clnts = NULL, *ap = NULL, *ret;
458 struct access_info *ai, *tmp_ai;
459 struct http_client *hc, *tmp_hc;
460
461 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
462 char *tmp = make_message("%s%s/%d ", ap? ap : "",
463 inet_ntoa(ai->addr), ai->netmask);
464 free(ap);
465 ap = tmp;
466 }
467 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
468 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
469 CLIENT_ADDR(hc), CLIENT_PORT(hc));
470 free(clnts);
471 clnts = tmp;
472 }
473 ret = make_message(
474 "http status: %s\n"
475 "http tcp port: %d\n"
476 "http clients: %d\n"
477 "http maximal number of clients: %d%s\n"
478 "http connected clients: %s\n"
479 "http access %s list: %s\n",
480 (self->status == SENDER_ON)? "on" : "off",
481 conf.http_port_arg,
482 numclients,
483 conf.http_max_clients_arg,
484 conf.http_max_clients_arg > 0? "" : " (unlimited)",
485 clnts? clnts : "(none)",
486 conf.http_default_deny_given? "allow" : "deny",
487 ap? ap : "(none)"
488 );
489 free(ap);
490 free(clnts);
491 return ret;
492 }
493
494 static void init_access_control_list(void)
495 {
496 int i;
497 struct sender_command_data scd;
498
499 INIT_LIST_HEAD(&access_perm_list);
500 for (i = 0; i < conf.http_access_given; i++) {
501 char *arg = para_strdup(conf.http_access_arg[i]);
502 char *p = strchr(arg, '/');
503 if (!p)
504 goto err;
505 *p = '\0';
506 if (!inet_aton(arg, &scd.addr))
507 goto err;
508 scd.netmask = atoi(++p);
509 if (scd.netmask < 0 || scd.netmask > 32)
510 goto err;
511 add_perm_list_entry(&scd);
512 goto success;
513 err:
514 PARA_CRIT_LOG("syntax error for http_access option "
515 "#%d, ignoring\n", i);
516 success:
517 free(arg);
518 continue;
519 }
520 }
521
522 static char *http_help(void)
523 {
524 return make_message(
525 "usage: {on|off}\n"
526 "usage: {allow|deny} IP mask\n"
527 "example: allow 127.0.0.1 32\n"
528 );
529 }
530
531 /**
532 * the init function of the http sender
533 *
534 * \param s pointer to the http sender struct
535 *
536 * It initializes all function pointers of \a s, init the client list and the
537 * acess control list as well. If autostart is wanted, open the tcp port.
538 */
539 void http_send_init(struct sender *s)
540 {
541 INIT_LIST_HEAD(&clients);
542 s->info = http_info;
543 s->send = http_send;
544 s->pre_select = http_pre_select;
545 s->post_select = http_post_select;
546 s->shutdown_clients = http_shutdown_clients;
547 s->help = http_help;
548 s->client_cmds[SENDER_ON] = http_com_on;
549 s->client_cmds[SENDER_OFF] = http_com_off;
550 s->client_cmds[SENDER_DENY] = http_com_deny;
551 s->client_cmds[SENDER_ALLOW] = http_com_allow;
552 s->client_cmds[SENDER_ADD] = NULL;
553 s->client_cmds[SENDER_DELETE] = NULL;
554 self = s;
555 init_access_control_list();
556 if (!conf.http_no_autostart_given)
557 open_tcp_port(conf.http_port_arg); /* ignore errors */
558 PARA_DEBUG_LOG("%s", "http sender init complete\n");
559 }