2 * Copyright (C) 2005-2007 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"
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"
41 /** the possible states of a client from the server's POV */
48 HTTP_INVALID_GET_REQUEST
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;
58 /** describes one client that connected the tcp port of the http sender */
60 /** the file descriptor of the client */
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 */
68 /** non-zero if we included \a fd in the write set */
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;
79 * describes one queued data packet for a client
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.
85 struct queued_packet {
86 /** the length of the packet in bytes */
88 /** pointer to the packet data */
90 /** position of the packet in the packet list */
91 struct list_head node;
95 * describes one entry in the blacklist/whitelist of the http sender
98 /** the address to be black/whitelisted */
100 /** the netmask for this entry */
102 /** the position of this entry in the access_perm_list */
103 struct list_head node;
106 static int server_fd = -1, numclients;
107 static struct sender *self;
110 static void http_shutdown_client(struct http_client *hc, const char *msg)
112 struct queued_packet *qp, *tmp;
113 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
117 del_close_on_fork_list(hc->fd);
118 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
127 static void http_shutdown_clients(void)
129 struct http_client *hc, *tmp;
130 list_for_each_entry_safe(hc, tmp, &clients, node)
131 http_shutdown_client(hc, "vss request");
134 static int http_send_msg(struct http_client *hc, const char *msg)
136 int ret = send_buffer(hc->fd, msg);
139 http_shutdown_client(hc, "send msg failed");
143 static void http_send_ok_msg(struct http_client *hc)
145 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
146 http_send_msg(hc, HTTP_OK_MSG);
149 static int http_send_err_msg(struct http_client *hc)
151 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
152 return http_send_msg(hc, HTTP_ERR_MSG);
155 static int queue_packet(struct http_client *hc, const char *buf, size_t len)
157 struct queued_packet *qp;
158 if (hc->pq_bytes + len > MAX_BACKLOG) {
159 http_shutdown_client(hc, "packet queue overrun");
162 qp = para_malloc(sizeof(struct queued_packet));
164 qp->packet = para_malloc(len);
165 memcpy(qp->packet, buf, 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);
172 static int send_queued_packets(struct http_client *hc)
175 struct queued_packet *qp, *tmp;
177 if (list_empty(&hc->packet_queue))
179 list_for_each_entry_safe(qp, tmp, &hc->packet_queue, node) {
180 ret = write_ok(hc->fd);
182 return ret? -E_WRITE_OK : 0;
183 ret = write(hc->fd, qp->packet, qp->len);
186 if (ret != qp->len) {
188 memmove(qp->packet, qp->packet + ret, qp->len);
191 hc->pq_bytes -= qp->len;
199 static void http_send( long unsigned current_chunk,
200 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
202 struct http_client *hc, *tmp;
205 list_for_each_entry_safe(hc, tmp, &clients, node) {
206 if (hc->status != HTTP_STREAMING &&
207 hc->status != HTTP_READY_TO_STREAM)
209 if (hc->status == HTTP_READY_TO_STREAM) {
211 char *hbuf = vss_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)
218 PARA_INFO_LOG("%s", "no need to queue header\n");
219 hc->status = HTTP_STREAMING;
221 ret = send_queued_packets(hc);
223 http_shutdown_client(hc, "send error");
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,
232 queue_packet(hc, buf, len);
235 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
236 ret = write(hc->fd, buf, len);
238 http_shutdown_client(hc, "send error");
242 queue_packet(hc, buf + ret, len - ret);
246 static int host_in_access_perm_list(struct http_client *hc)
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))
257 static void http_post_select(fd_set *rfds, fd_set *wfds)
260 struct http_client *hc, *tmp;
263 list_for_each_entry_safe(hc, tmp, &clients, node) {
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:
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)
274 hc->status = HTTP_INVALID_GET_REQUEST;
276 hc->status = HTTP_GOT_GET_REQUEST;
278 "received get request\n");
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);
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");
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;
301 if (!FD_ISSET(server_fd, rfds))
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));
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";
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";
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);
326 para_list_add(&hc->node, &clients);
327 add_close_on_fork_list(hc->fd);
328 mark_fd_nonblock(hc->fd);
331 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
332 CLIENT_ADDR(hc), err_msg);
338 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
340 struct http_client *hc, *tmp;
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);
349 switch (hc->status) {
351 case HTTP_READY_TO_STREAM:
353 case HTTP_CONNECTED: /* need to recv get request */
354 para_fd_set(hc->fd, rfds, max_fileno);
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);
362 case HTTP_SENT_OK_MSG:
364 break; /* wait until server starts playing */
365 para_fd_set(hc->fd, wfds, max_fileno);
372 static int open_tcp_port(int port)
376 server_fd = init_tcp_socket(port);
378 http_shutdown_clients();
379 self->status = SENDER_OFF;
382 ret = mark_fd_nonblock(server_fd);
384 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
387 self->status = SENDER_ON;
388 add_close_on_fork_list(server_fd);
392 static int http_com_on(__a_unused struct sender_command_data *scd)
394 if (self->status == SENDER_ON)
396 return open_tcp_port(conf.http_port_arg);
399 static int http_com_off(__a_unused struct sender_command_data *scd)
401 self->status = SENDER_OFF;
404 del_close_on_fork_list(server_fd);
407 http_shutdown_clients();
411 static void del_perm_list_entry(struct sender_command_data *scd)
413 struct access_info *ai, *tmp;
415 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
416 char *nad = para_strdup(inet_ntoa(ai->addr));
417 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
418 ai->netmask == scd->netmask) {
419 PARA_NOTICE_LOG("removing %s/%i from access list\n",
428 static void add_perm_list_entry(struct sender_command_data *scd)
430 struct access_info *ai = para_malloc(sizeof(struct access_info));
431 ai->addr = scd->addr;
432 ai->netmask = scd->netmask;
433 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
435 para_list_add(&ai->node, &access_perm_list);
438 static int http_com_deny(struct sender_command_data *scd)
440 if (conf.http_default_deny_given)
441 del_perm_list_entry(scd);
443 add_perm_list_entry(scd);
447 static int http_com_allow(struct sender_command_data *scd)
449 if (conf.http_default_deny_given)
450 add_perm_list_entry(scd);
452 del_perm_list_entry(scd);
456 static char *http_info(void)
458 char *clnts = NULL, *ap = NULL, *ret;
459 struct access_info *ai, *tmp_ai;
460 struct http_client *hc, *tmp_hc;
462 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
463 char *tmp = make_message("%s%s/%d ", ap? ap : "",
464 inet_ntoa(ai->addr), ai->netmask);
468 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
469 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
470 CLIENT_ADDR(hc), CLIENT_PORT(hc));
476 "http tcp port: %d\n"
478 "http maximal number of clients: %d%s\n"
479 "http connected clients: %s\n"
480 "http access %s list: %s\n",
481 (self->status == SENDER_ON)? "on" : "off",
484 conf.http_max_clients_arg,
485 conf.http_max_clients_arg > 0? "" : " (unlimited)",
486 clnts? clnts : "(none)",
487 conf.http_default_deny_given? "allow" : "deny",
495 static void init_access_control_list(void)
498 struct sender_command_data scd;
500 INIT_LIST_HEAD(&access_perm_list);
501 for (i = 0; i < conf.http_access_given; i++) {
502 char *arg = para_strdup(conf.http_access_arg[i]);
503 char *p = strchr(arg, '/');
507 if (!inet_aton(arg, &scd.addr))
509 scd.netmask = atoi(++p);
510 if (scd.netmask < 0 || scd.netmask > 32)
512 add_perm_list_entry(&scd);
515 PARA_CRIT_LOG("syntax error for http_access option "
516 "#%d, ignoring\n", i);
523 static char *http_help(void)
527 "usage: {allow|deny} IP mask\n"
528 "example: allow 127.0.0.1 32\n"
533 * the init function of the http sender
535 * \param s pointer to the http sender struct
537 * It initializes all function pointers of \a s, init the client list and the
538 * acess control list as well. If autostart is wanted, open the tcp port.
540 void http_send_init(struct sender *s)
542 INIT_LIST_HEAD(&clients);
545 s->pre_select = http_pre_select;
546 s->post_select = http_post_select;
547 s->shutdown_clients = http_shutdown_clients;
549 s->client_cmds[SENDER_ON] = http_com_on;
550 s->client_cmds[SENDER_OFF] = http_com_off;
551 s->client_cmds[SENDER_DENY] = http_com_deny;
552 s->client_cmds[SENDER_ALLOW] = http_com_allow;
553 s->client_cmds[SENDER_ADD] = NULL;
554 s->client_cmds[SENDER_DELETE] = NULL;
556 init_access_control_list();
557 if (!conf.http_no_autostart_given)
558 open_tcp_port(conf.http_port_arg); /* ignore errors */
559 PARA_DEBUG_LOG("%s", "http sender init complete\n");