dccp_send/http_send: add all fds to close_on_fork_list
[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 del_close_on_fork_list(hc->fd);
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(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
136 static int http_send_msg(struct http_client *hc, const char *msg)
137 {
138 int ret = send_buffer(hc->fd, msg);
139
140 if (ret < 0)
141 http_shutdown_client(hc, "send msg failed");
142 return ret;
143 }
144
145 static void http_send_ok_msg(struct http_client *hc)
146 {
147 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
148 http_send_msg(hc, HTTP_OK_MSG);
149 }
150
151 static int http_send_err_msg(struct http_client *hc)
152 {
153 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
154 return http_send_msg(hc, HTTP_ERR_MSG);
155 }
156
157 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
158 {
159 struct queued_packet *qp;
160 if (hc->pq_bytes + len > MAX_BACKLOG) {
161 http_shutdown_client(hc, "packet queue overrun");
162 return -E_QUEUE;
163 }
164 qp = para_malloc(sizeof(struct queued_packet));
165 hc->pq_bytes += len;
166 qp->packet = para_malloc(len);
167 memcpy(qp->packet, buf, len);
168 qp->len = len;
169 list_add_tail(&qp->node, &hc->packet_queue);
170 PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
171 return 1;
172 }
173
174 static int send_queued_packets(struct http_client *hc)
175 {
176 int ret;
177 struct queued_packet *qp, *tmp;
178
179 if (list_empty(&hc->packet_queue))
180 return 1;
181 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
182 ret = write_ok(hc->fd);
183 if (ret <= 0)
184 return ret? -E_WRITE_OK : 0;
185 ret = write(hc->fd, qp->packet, qp->len);
186 if (ret < 0)
187 return ret;
188 if (ret != qp->len) {
189 qp->len -= ret;
190 memmove(qp->packet, qp->packet + ret, qp->len);
191 return 0;
192 }
193 hc->pq_bytes -= qp->len;
194 free(qp->packet);
195 list_del(&qp->node);
196 free(qp);
197 }
198 return 1;
199 }
200
201 static void http_send( long unsigned current_chunk,
202 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
203 {
204 struct http_client *hc, *tmp;
205 int ret;
206
207 list_for_each_entry_safe(hc, tmp, &clients, node) {
208 if (hc->status != HTTP_STREAMING &&
209 hc->status != HTTP_READY_TO_STREAM)
210 continue;
211 if (hc->status == HTTP_READY_TO_STREAM) {
212 int hlen;
213 char *buf = afs_get_header(&hlen);
214 if (buf && hlen > 0 && current_chunk) {
215 /* need to send header */
216 PARA_INFO_LOG("queueing header: %d\n", hlen);
217 if (queue_packet(hc, buf, hlen) < 0)
218 continue;
219 } else
220 PARA_INFO_LOG("%s", "no need to queue header\n");
221 hc->status = HTTP_STREAMING;
222 }
223 ret = send_queued_packets(hc);
224 if (ret < 0) {
225 http_shutdown_client(hc, "send error");
226 continue;
227 }
228 if (!len)
229 continue;
230 if (!ret || write_ok(hc->fd) <= 0) {
231 PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
232 " trying to queue packet\n", hc->fd,
233 hc->pq_bytes);
234 queue_packet(hc, buf, len);
235 continue;
236 }
237 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
238 ret = write(hc->fd, buf, len);
239 if (ret < 0) {
240 http_shutdown_client(hc, "send error");
241 continue;
242 }
243 if (ret != len)
244 queue_packet(hc, buf + ret, len - ret);
245 }
246 }
247
248 static int host_in_access_perm_list(struct http_client *hc)
249 {
250 struct access_info *ai, *tmp;
251 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
252 unsigned mask = ((~0) >> ai->netmask);
253 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
254 return 1;
255 }
256 return 0;
257 }
258
259 static void http_post_select(fd_set *rfds, fd_set *wfds)
260 {
261 int i = -1, match;
262 struct http_client *hc, *tmp;
263 const char *err_msg;
264
265 list_for_each_entry_safe(hc, tmp, &clients, node) {
266 i++;
267 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
268 switch (hc->status) {
269 case HTTP_STREAMING: /* nothing to do */
270 case HTTP_READY_TO_STREAM:
271 break;
272 case HTTP_CONNECTED: /* need to recv get request */
273 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
274 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
275 < 0) {
276 hc->status = HTTP_INVALID_GET_REQUEST;
277 } else {
278 hc->status = HTTP_GOT_GET_REQUEST;
279 PARA_INFO_LOG("%s",
280 "received get request\n");
281 }
282 }
283 break;
284 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
285 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
286 hc->status = HTTP_SENT_OK_MSG;
287 http_send_ok_msg(hc);
288 }
289 break;
290 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
291 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
292 if (http_send_err_msg(hc) >= 0)
293 http_shutdown_client(hc,
294 "invalid get request");
295 }
296 break;
297 case HTTP_SENT_OK_MSG: /* need to send header? */
298 if (hc->check_w && FD_ISSET(hc->fd, wfds))
299 hc->status = HTTP_READY_TO_STREAM;
300 break;
301 }
302 }
303 if (!FD_ISSET(server_fd, rfds))
304 return;
305 hc = para_calloc(sizeof(struct http_client));
306 err_msg = "accept error";
307 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
308 if (hc->fd <= 0)
309 goto err_out;
310 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
311 if (conf.http_max_clients_arg > 0 && numclients >=
312 conf.http_max_clients_arg) {
313 err_msg = "server full";
314 goto err_out;
315 }
316 match = host_in_access_perm_list(hc);
317 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
318 if ((match && !conf.http_default_deny_given) ||
319 (!match && conf.http_default_deny_given)) {
320 err_msg = "permission denied";
321 goto err_out;
322 }
323 hc->status = HTTP_CONNECTED;
324 INIT_LIST_HEAD(&hc->packet_queue);
325 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
326 CLIENT_ADDR(hc), hc->fd);
327 numclients++;
328 list_add(&hc->node, &clients);
329 add_close_on_fork_list(hc->fd);
330 mark_fd_nonblock(hc->fd);
331 return;
332 err_out:
333 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
334 CLIENT_ADDR(hc), err_msg);
335 if (hc->fd > 0)
336 close(hc->fd);
337 free(hc);
338 }
339
340 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
341 {
342 struct http_client *hc, *tmp;
343
344 if (server_fd < 0)
345 return;
346 para_fd_set(server_fd, rfds, max_fileno);
347 list_for_each_entry_safe(hc, tmp, &clients, node) {
348 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
349 hc->check_r = 0;
350 hc->check_w = 0;
351 switch (hc->status) {
352 case HTTP_STREAMING:
353 case HTTP_READY_TO_STREAM:
354 break;
355 case HTTP_CONNECTED: /* need to recv get request */
356 para_fd_set(hc->fd, rfds, max_fileno);
357 hc->check_r = 1;
358 break;
359 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
360 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
361 para_fd_set(hc->fd, wfds, max_fileno);
362 hc->check_w = 1;
363 break;
364 case HTTP_SENT_OK_MSG:
365 if (!afs_playing())
366 break; /* wait until server starts playing */
367 para_fd_set(hc->fd, wfds, max_fileno);
368 hc->check_w = 1;
369 break;
370 }
371 }
372 }
373
374 static int open_tcp_port(int port)
375 {
376 server_fd = init_tcp_socket(port);
377 if (server_fd < 0) {
378 http_shutdown_clients();
379 self->status = SENDER_OFF;
380 return server_fd;
381 }
382 self->status = SENDER_ON;
383 add_close_on_fork_list(server_fd);
384 return 1;
385 }
386
387 static int http_com_on(__a_unused struct sender_command_data *scd)
388 {
389 if (self->status == SENDER_ON)
390 return 1;
391 return open_tcp_port(conf.http_port_arg);
392 }
393
394 static int http_com_off(__a_unused struct sender_command_data *scd)
395 {
396 self->status = SENDER_OFF;
397 if (server_fd > 0) {
398 close(server_fd);
399 del_close_on_fork_list(server_fd);
400 server_fd = -1;
401 }
402 http_shutdown_clients();
403 return 1;
404 }
405
406 static void del_perm_list_entry(struct sender_command_data *scd)
407 {
408 struct access_info *ai, *tmp;
409
410 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
411 char *nad = para_strdup(inet_ntoa(ai->addr));
412 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
413 ai->netmask == scd->netmask) {
414 PARA_NOTICE_LOG("removing %s/%i from access list\n",
415 nad, ai->netmask);
416 list_del(&ai->node);
417 free(ai);
418 }
419 free(nad);
420 }
421 }
422
423 static void add_perm_list_entry(struct sender_command_data *scd)
424 {
425 struct access_info *ai = para_malloc(sizeof(struct access_info));
426 ai->addr = scd->addr;
427 ai->netmask = scd->netmask;
428 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
429 ai->netmask);
430 list_add(&ai->node, &access_perm_list);
431 }
432
433 static int http_com_deny(struct sender_command_data *scd)
434 {
435 if (conf.http_default_deny_given)
436 del_perm_list_entry(scd);
437 else
438 add_perm_list_entry(scd);
439 return 1;
440 }
441
442 static int http_com_allow(struct sender_command_data *scd)
443 {
444 if (conf.http_default_deny_given)
445 add_perm_list_entry(scd);
446 else
447 del_perm_list_entry(scd);
448 return 1;
449 }
450
451 static char *http_info(void)
452 {
453 char *clnts = NULL, *ap = NULL, *ret;
454 struct access_info *ai, *tmp_ai;
455 struct http_client *hc, *tmp_hc;
456
457 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
458 char *tmp = make_message("%s%s/%d ", ap? ap : "",
459 inet_ntoa(ai->addr), ai->netmask);
460 free(ap);
461 ap = tmp;
462 }
463 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
464 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
465 CLIENT_ADDR(hc), CLIENT_PORT(hc));
466 free(clnts);
467 clnts = tmp;
468 }
469 ret = make_message(
470 "http status: %s\n"
471 "http tcp port: %d\n"
472 "http clients: %d\n"
473 "http maximal number of clients: %d%s\n"
474 "http connected clients: %s\n"
475 "http access %s list: %s\n",
476 (self->status == SENDER_ON)? "on" : "off",
477 conf.http_port_arg,
478 numclients,
479 conf.http_max_clients_arg,
480 conf.http_max_clients_arg > 0? "" : " (unlimited)",
481 clnts? clnts : "(none)",
482 conf.http_default_deny_given? "allow" : "deny",
483 ap? ap : "(none)"
484 );
485 free(ap);
486 free(clnts);
487 return ret;
488 }
489
490 static void init_access_control_list(void)
491 {
492 int i;
493 struct sender_command_data scd;
494
495 INIT_LIST_HEAD(&access_perm_list);
496 for (i = 0; i < conf.http_access_given; i++) {
497 char *arg = para_strdup(conf.http_access_arg[i]);
498 char *p = strchr(arg, '/');
499 if (!p)
500 goto err;
501 *p = '\0';
502 if (!inet_aton(arg, &scd.addr))
503 goto err;
504 scd.netmask = atoi(++p);
505 if (scd.netmask < 0 || scd.netmask > 32)
506 goto err;
507 add_perm_list_entry(&scd);
508 goto success;
509 err:
510 PARA_CRIT_LOG("syntax error for http_access option "
511 "#%d, ignoring\n", i);
512 success:
513 free(arg);
514 continue;
515 }
516 }
517
518 static char *http_help(void)
519 {
520 return make_message(
521 "usage: {on|off}\n"
522 "usage: {allow|deny} IP mask\n"
523 "example: allow 127.0.0.1 32\n"
524 );
525 }
526
527 /**
528 * the init function of the http sender
529 *
530 * \param s pointer to the http sender struct
531 *
532 * It initializes all function pointers of \a s, init the client list and the
533 * acess control list as well. If autostart is wanted, open the tcp port.
534 */
535 void http_send_init(struct sender *s)
536 {
537 INIT_LIST_HEAD(&clients);
538 s->info = http_info;
539 s->send = http_send;
540 s->pre_select = http_pre_select;
541 s->post_select = http_post_select;
542 s->shutdown_clients = http_shutdown_clients;
543 s->help = http_help;
544 s->client_cmds[SENDER_ON] = http_com_on;
545 s->client_cmds[SENDER_OFF] = http_com_off;
546 s->client_cmds[SENDER_DENY] = http_com_deny;
547 s->client_cmds[SENDER_ALLOW] = http_com_allow;
548 s->client_cmds[SENDER_ADD] = NULL;
549 s->client_cmds[SENDER_DELETE] = NULL;
550 self = s;
551 init_access_control_list();
552 if (!conf.http_no_autostart_given)
553 open_tcp_port(conf.http_port_arg); /* ignore errors */
554 PARA_DEBUG_LOG("%s", "http sender init complete\n");
555 }