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