2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 /** \file http_send.c paraslash's http sender */
22 #include "server.cmdline.h"
28 #include "close_on_fork.h"
33 /** \cond convert sock_addr_in to ascii */
34 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
35 /* get the port number of a struct http_client */
36 #define CLIENT_PORT(hc) (hc)->addr.sin_port
37 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
40 extern struct gengetopt_args_info conf;
42 /** the possible states of a client from the server's POV */
49 HTTP_INVALID_GET_REQUEST
52 /** clients will be kicked if there are more than that many bytes pending */
53 #define MAX_BACKLOG 40000
54 /** the list of connected clients **/
55 static struct list_head clients;
56 /** the whitelist/blacklist */
57 static struct list_head access_perm_list;
59 /** describes one client that connected the tcp port of the http sender */
61 /** the file descriptor of the client */
63 /** address information about the client */
64 struct sockaddr_in addr;
65 /** the client's current status */
66 enum http_status status;
67 /** non-zero if we included \a fd in the read set */
69 /** non-zero if we included \a fd in the write set */
71 /** the position of this client in the client list */
72 struct list_head node;
73 /** the list of pending packets for this client */
74 struct list_head packet_queue;
75 /** the number of pending bytes for this client */
76 unsigned long pq_bytes;
80 * describes one queued data packet for a client
82 * The send function of the http sender checks each client fd for writing. If a
83 * client fd is not ready, it tries to queue that packet for this client until
84 * the number of queued bytes exceeds \p MAX_BACKLOG.
86 struct queued_packet {
87 /** the length of the packet in bytes */
89 /** pointer to the packet data */
91 /** position of the packet in the packet list */
92 struct list_head node;
96 * describes one entry in the blacklist/whitelist of the http sender
99 /** the address to be black/whitelisted */
101 /** the netmask for this entry */
103 /** the position of this entry in the access_perm_list */
104 struct list_head node;
107 static int server_fd = -1, numclients;
108 static struct sender *self;
111 static void http_shutdown_client(struct http_client *hc, const char *msg)
113 struct queued_packet *qp, *tmp;
114 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
119 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
129 static void http_shutdown_clients_real(void)
131 struct http_client *hc, *tmp;
132 list_for_each_entry_safe(hc, tmp, &clients, node)
133 http_shutdown_client(hc, "afs request");
135 static void http_shutdown_clients(void)
137 struct http_client *hc, *tmp;
138 list_for_each_entry_safe(hc, tmp, &clients, node)
139 if (hc->status == HTTP_STREAMING)
140 http_shutdown_client(hc, "afs request");
143 static int http_send_msg(struct http_client *hc, const char *msg)
145 int ret = send_buffer(hc->fd, msg);
148 http_shutdown_client(hc, "send msg failed");
152 static void http_send_ok_msg(struct http_client *hc)
154 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
155 http_send_msg(hc, HTTP_OK_MSG);
158 static int http_send_err_msg(struct http_client *hc)
160 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
161 return http_send_msg(hc, HTTP_ERR_MSG);
164 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
166 struct queued_packet *qp;
167 if (hc->pq_bytes + len > MAX_BACKLOG) {
168 http_shutdown_client(hc, "packet queue overrun");
171 qp = para_malloc(sizeof(struct queued_packet));
173 qp->packet = para_malloc(len);
174 memcpy(qp->packet, buf, len);
176 list_add_tail(&qp->node, &hc->packet_queue);
177 PARA_INFO_LOG("%lu bytes queued for fd %d\n", hc->pq_bytes, hc->fd);
181 static int write_ok(int fd)
183 struct timeval tv = {0, 0};
189 ret = select(fd + 1, NULL, &wfds, NULL, &tv);
190 if (ret < 0 && errno == EINTR)
198 static int send_queued_packets(struct http_client *hc)
201 struct queued_packet *qp, *tmp;
203 if (list_empty(&hc->packet_queue))
205 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
206 ret = write_ok(hc->fd);
209 ret = write(hc->fd, qp->packet, qp->len);
212 if (ret != qp->len) {
214 memmove(qp->packet, qp->packet + ret, qp->len);
217 hc->pq_bytes -= qp->len;
225 static void http_send(__unused struct audio_format *af,
226 long unsigned current_chunk,
227 __unused long unsigned chunks_sent, const char *buf, size_t len)
229 struct http_client *hc, *tmp;
232 list_for_each_entry_safe(hc, tmp, &clients, node) {
233 if (hc->status != HTTP_STREAMING &&
234 hc->status != HTTP_READY_TO_STREAM)
236 if (hc->status == HTTP_READY_TO_STREAM) {
237 if (af->get_header_info && current_chunk) {
238 /* need to send header */
240 char *buf = af->get_header_info(&hlen);
241 if (!buf || hlen <= 0)
242 continue; /* header not yet available */
243 PARA_INFO_LOG("queueing header: %d\n", hlen);
244 if (queue_packet(hc, buf, hlen) < 0)
247 PARA_INFO_LOG("%s", "no need to queue header\n");
248 hc->status = HTTP_STREAMING;
250 ret = send_queued_packets(hc);
252 http_shutdown_client(hc, "send error");
257 if (!ret || write_ok(hc->fd) <= 0) {
258 PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
259 " trying to queue packet\n", hc->fd,
261 queue_packet(hc, buf, len);
264 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
265 ret = write(hc->fd, buf, len);
267 http_shutdown_client(hc, "send error");
271 queue_packet(hc, buf + ret, len - ret);
275 static int host_in_access_perm_list(struct http_client *hc)
277 struct access_info *ai, *tmp;
278 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
279 unsigned mask = ((~0) >> ai->netmask);
280 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
286 static void http_post_select(__unused struct audio_format *af, fd_set *rfds,
290 struct http_client *hc, *tmp;
293 list_for_each_entry_safe(hc, tmp, &clients, node) {
295 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
296 switch (hc->status) {
297 case HTTP_STREAMING: /* nothing to do */
298 case HTTP_READY_TO_STREAM:
300 case HTTP_CONNECTED: /* need to recv get request */
301 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
302 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
304 hc->status = HTTP_INVALID_GET_REQUEST;
306 hc->status = HTTP_GOT_GET_REQUEST;
308 "received get request\n");
312 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
313 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
314 hc->status = HTTP_SENT_OK_MSG;
315 http_send_ok_msg(hc);
318 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
319 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
320 if (http_send_err_msg(hc) >= 0)
321 http_shutdown_client(hc,
322 "invalid get request");
325 case HTTP_SENT_OK_MSG: /* need to send header? */
326 if (hc->check_w && FD_ISSET(hc->fd, wfds))
327 hc->status = HTTP_READY_TO_STREAM;
331 if (!FD_ISSET(server_fd, rfds))
333 hc = para_calloc(sizeof(struct http_client));
334 err_msg = "accept error";
335 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
338 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
339 if (conf.http_max_clients_arg > 0 && numclients >=
340 conf.http_max_clients_arg) {
341 err_msg = "server full";
344 match = host_in_access_perm_list(hc);
345 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
346 if ((match && !conf.http_default_deny_given) ||
347 (!match && conf.http_default_deny_given)) {
348 err_msg = "permission denied";
351 hc->status = HTTP_CONNECTED;
352 INIT_LIST_HEAD(&hc->packet_queue);
353 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
354 CLIENT_ADDR(hc), hc->fd);
356 list_add(&hc->node, &clients);
359 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
360 CLIENT_ADDR(hc), err_msg);
366 static void http_pre_select(struct audio_format *af, int *max_fileno, fd_set *rfds,
369 struct http_client *hc, *tmp;
373 FD_SET(server_fd, rfds);
374 *max_fileno = MAX(*max_fileno, server_fd);
375 list_for_each_entry_safe(hc, tmp, &clients, node) {
376 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
379 switch (hc->status) {
381 case HTTP_READY_TO_STREAM:
383 case HTTP_CONNECTED: /* need to recv get request */
384 FD_SET(hc->fd, rfds);
385 *max_fileno = MAX(*max_fileno, hc->fd);
388 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
389 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
390 FD_SET(hc->fd, wfds);
391 *max_fileno = MAX(*max_fileno, hc->fd);
394 case HTTP_SENT_OK_MSG:
395 if (!af || !afs_playing())
396 break; /* wait until server starts playing */
397 FD_SET(hc->fd, wfds);
398 *max_fileno = MAX(*max_fileno, hc->fd);
405 static int open_tcp_port(int port)
407 server_fd = init_tcp_socket(port);
409 http_shutdown_clients_real();
410 self->status = SENDER_OFF;
413 self->status = SENDER_ON;
414 add_close_on_fork_list(server_fd);
418 static int http_com_on(__unused struct sender_command_data *scd)
420 if (self->status == SENDER_ON)
422 return open_tcp_port(conf.http_port_arg);
425 static int http_com_off(__unused struct sender_command_data *scd)
427 self->status = SENDER_OFF;
430 del_close_on_fork_list(server_fd);
433 http_shutdown_clients_real();
437 static void del_perm_list_entry(struct sender_command_data *scd)
439 struct access_info *ai, *tmp;
441 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
442 char *nad = para_strdup(inet_ntoa(ai->addr));
443 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
444 ai->netmask == scd->netmask) {
445 PARA_NOTICE_LOG("removing %s/%i from access list\n",
454 static void add_perm_list_entry(struct sender_command_data *scd)
456 struct access_info *ai = para_malloc(sizeof(struct access_info));
457 ai->addr = scd->addr;
458 ai->netmask = scd->netmask;
459 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
461 list_add(&ai->node, &access_perm_list);
464 static int http_com_deny(struct sender_command_data *scd)
466 if (conf.http_default_deny_given)
467 del_perm_list_entry(scd);
469 add_perm_list_entry(scd);
473 static int http_com_allow(struct sender_command_data *scd)
475 if (conf.http_default_deny_given)
476 add_perm_list_entry(scd);
478 del_perm_list_entry(scd);
482 static char *http_info(void)
484 char *clnts = NULL, *ap = NULL, *ret;
485 struct access_info *ai, *tmp_ai;
486 struct http_client *hc, *tmp_hc;
488 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
489 char *tmp = make_message("%s%s/%d ", ap? ap : "",
490 inet_ntoa(ai->addr), ai->netmask);
494 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
495 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
496 CLIENT_ADDR(hc), CLIENT_PORT(hc));
502 "http tcp port: %d\n"
504 "http maximal number of clients: %d%s\n"
505 "http connected clients: %s\n"
506 "http access %s list: %s\n",
507 (self->status == SENDER_ON)? "on" : "off",
510 conf.http_max_clients_arg,
511 conf.http_max_clients_arg > 0? "" : " (unlimited)",
512 clnts? clnts : "(none)",
513 conf.http_default_deny_given? "allow" : "deny",
521 static void init_access_control_list(void)
524 struct sender_command_data scd;
526 INIT_LIST_HEAD(&access_perm_list);
527 for (i = 0; i < conf.http_access_given; i++) {
528 char *arg = para_strdup(conf.http_access_arg[i]);
529 char *p = strchr(arg, '/');
533 if (!inet_aton(arg, &scd.addr))
535 scd.netmask = atoi(++p);
536 if (scd.netmask < 0 || scd.netmask > 32)
538 add_perm_list_entry(&scd);
541 PARA_CRIT_LOG("syntax error for http_access option "
542 "#%d, ignoring\n", i);
549 static char *http_help(void)
553 "usage: {allow|deny} IP mask\n"
554 "example: allow 127.0.0.1 32\n"
559 * the init function of the http sender
561 * \param s pointer to the http sender struct
563 * It initializes all function pointers of \a s, init the client list and the
564 * acess control list as well. If autostart is wanted, open the tcp port.
566 void http_send_init(struct sender *s)
568 INIT_LIST_HEAD(&clients);
571 s->pre_select = http_pre_select;
572 s->post_select = http_post_select;
573 s->shutdown_clients = http_shutdown_clients;
575 s->client_cmds[SENDER_ON] = http_com_on;
576 s->client_cmds[SENDER_OFF] = http_com_off;
577 s->client_cmds[SENDER_DENY] = http_com_deny;
578 s->client_cmds[SENDER_ALLOW] = http_com_allow;
579 s->client_cmds[SENDER_ADD] = NULL;
580 s->client_cmds[SENDER_DELETE] = NULL;
582 init_access_control_list();
583 if (!conf.http_no_autostart_given)
584 open_tcp_port(conf.http_port_arg);
585 PARA_DEBUG_LOG("%s", "http sender init complete\n");