2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file http_send.c paraslash's http sender */
15 #include "server.cmdline.h"
23 #include "close_on_fork.h"
26 #include "chunk_queue.h"
28 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
31 /** The possible states of a client from the server's POV. */
33 /** We accepted the connection on the tcp socket. */
35 /** Successfully received the get request. */
37 /** We sent the OK message back to the client. */
39 /** Connection established, we might need to send the audio file header. */
41 /** Connection is ready for sending audio data. */
43 /** We didn't receive a valid get request. */
44 HTTP_INVALID_GET_REQUEST
47 /** Clients will be kicked if there are more than that many bytes pending. */
48 #define MAX_BACKLOG 400000
49 /** The list of connected clients. */
50 static struct list_head clients;
51 /** The whitelist/blacklist. */
52 static struct list_head access_perm_list;
54 /** Describes one client that connected the tcp port of the http sender. */
56 /** The file descriptor of the client. */
58 /** The socket `name' of the client. */
60 /** The client's current status. */
61 enum http_status status;
62 /** Non-zero if we included \a fd in the read set.*/
64 /** Non-zero if we included \a fd in the write set. */
66 /** The position of this client in the client list. */
67 struct list_head node;
68 /** The list of pending chunks for this client. */
69 struct chunk_queue *cq;
73 * Describes one entry in the blacklist/whitelist of the http sender.
76 /** The address to be black/whitelisted. */
78 /** The netmask for this entry. */
80 /** The position of this entry in the access_perm_list. */
81 struct list_head node;
84 static int server_fd = -1, numclients;
85 static struct sender *self;
88 static void http_shutdown_client(struct http_client *hc, const char *msg)
90 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc->name, hc->fd,
95 del_close_on_fork_list(hc->fd);
101 static void http_shutdown_clients(void)
103 struct http_client *hc, *tmp;
104 list_for_each_entry_safe(hc, tmp, &clients, node)
105 http_shutdown_client(hc, "vss request");
108 static int http_send_msg(struct http_client *hc, const char *msg)
110 int ret = send_buffer(hc->fd, msg);
113 http_shutdown_client(hc, "send msg failed");
117 static void http_send_ok_msg(struct http_client *hc)
119 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
120 http_send_msg(hc, HTTP_OK_MSG);
123 static int http_send_err_msg(struct http_client *hc)
125 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
126 return http_send_msg(hc, HTTP_ERR_MSG);
129 static int send_queued_chunks(struct http_client *hc)
131 struct queued_chunk *qc;
132 while ((qc = cq_peek(hc->cq))) {
135 int ret = write_ok(hc->fd);
137 return ret? -E_WRITE_OK : 0;
138 cq_get(qc, &buf, &len);
139 ret = write(hc->fd, buf, len);
141 return -E_SEND_QUEUED_CHUNK;
142 cq_update(hc->cq, ret);
150 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
153 int ret = cq_enqueue(hc->cq, chunk_num, sent);
155 http_shutdown_client(hc, "queue error");
159 static void http_send( long unsigned current_chunk,
160 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
162 struct http_client *hc, *tmp;
165 list_for_each_entry_safe(hc, tmp, &clients, node) {
166 if (hc->status != HTTP_STREAMING &&
167 hc->status != HTTP_READY_TO_STREAM)
169 if (hc->status == HTTP_READY_TO_STREAM) {
171 char *hbuf = vss_get_header(&hlen);
172 if (hbuf && hlen > 0 && current_chunk) {
173 /* need to send header */
174 PARA_INFO_LOG("queueing header: %zu\n", hlen);
175 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
178 PARA_INFO_LOG("no need to queue header\n");
179 hc->status = HTTP_STREAMING;
181 ret = send_queued_chunks(hc);
183 http_shutdown_client(hc, "queue send error");
188 if (!ret || write_ok(hc->fd) <= 0) {
189 queue_chunk_or_shutdown(hc, current_chunk, 0);
192 // PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
193 ret = write(hc->fd, buf, len);
194 // PARA_DEBUG_LOG("ret: %d\n", ret);
196 http_shutdown_client(hc, "send error");
200 queue_chunk_or_shutdown(hc, current_chunk, ret);
204 static int host_in_access_perm_list(struct http_client *hc)
206 struct sockaddr_storage ss;
207 socklen_t sslen = sizeof(ss);
209 if (getpeername(hc->fd, (struct sockaddr *)&ss, &sslen) < 0) {
210 PARA_ERROR_LOG("can not determine address family: %s\n", strerror(errno));
211 } else if (ss.ss_family == AF_INET) {
212 /* FIXME: access restriction is (currently) only supported for IPv4 */
213 struct access_info *ai, *tmp;
214 struct in_addr client_addr = ((struct sockaddr_in *)&ss)->sin_addr;
216 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
217 unsigned mask = ((~0U) >> ai->netmask);
218 if ((client_addr.s_addr & mask) == (ai->addr.s_addr & mask))
225 static void http_post_select(fd_set *rfds, fd_set *wfds)
228 struct http_client *hc, *tmp;
231 list_for_each_entry_safe(hc, tmp, &clients, node) {
233 // PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
234 switch (hc->status) {
235 case HTTP_STREAMING: /* nothing to do */
236 case HTTP_READY_TO_STREAM:
238 case HTTP_CONNECTED: /* need to recv get request */
239 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
240 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
242 hc->status = HTTP_INVALID_GET_REQUEST;
244 hc->status = HTTP_GOT_GET_REQUEST;
246 "received get request\n");
250 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
251 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
252 hc->status = HTTP_SENT_OK_MSG;
253 http_send_ok_msg(hc);
256 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
257 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
258 if (http_send_err_msg(hc) >= 0)
259 http_shutdown_client(hc,
260 "invalid get request");
263 case HTTP_SENT_OK_MSG: /* need to send header? */
264 if (hc->check_w && FD_ISSET(hc->fd, wfds))
265 hc->status = HTTP_READY_TO_STREAM;
269 if (!FD_ISSET(server_fd, rfds))
271 hc = para_calloc(sizeof(struct http_client));
272 err_msg = "accept error";
273 hc->fd = para_accept(server_fd, NULL, 0);
276 hc->name = make_message("%s", remote_name(hc->fd));
277 PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
278 if (conf.http_max_clients_arg > 0 && numclients >=
279 conf.http_max_clients_arg) {
280 err_msg = "server full";
283 match = host_in_access_perm_list(hc);
284 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
285 if ((match && !conf.http_default_deny_given) ||
286 (!match && conf.http_default_deny_given)) {
287 err_msg = "permission denied";
290 hc->status = HTTP_CONNECTED;
291 hc->cq = cq_new(MAX_BACKLOG);
293 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
295 para_list_add(&hc->node, &clients);
296 add_close_on_fork_list(hc->fd);
297 mark_fd_nonblocking(hc->fd);
300 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
307 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
309 struct http_client *hc, *tmp;
313 para_fd_set(server_fd, rfds, max_fileno);
314 list_for_each_entry_safe(hc, tmp, &clients, node) {
315 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
318 switch (hc->status) {
320 case HTTP_READY_TO_STREAM:
322 case HTTP_CONNECTED: /* need to recv get request */
323 para_fd_set(hc->fd, rfds, max_fileno);
326 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
327 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
328 para_fd_set(hc->fd, wfds, max_fileno);
331 case HTTP_SENT_OK_MSG:
333 break; /* wait until server starts playing */
334 para_fd_set(hc->fd, wfds, max_fileno);
341 static int open_tcp_port(int port)
345 server_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
347 http_shutdown_clients();
348 self->status = SENDER_OFF;
351 ret = mark_fd_nonblocking(server_fd);
353 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
356 self->status = SENDER_ON;
357 add_close_on_fork_list(server_fd);
361 static int http_com_on(__a_unused struct sender_command_data *scd)
363 if (self->status == SENDER_ON)
365 return open_tcp_port(conf.http_port_arg);
368 static int http_com_off(__a_unused struct sender_command_data *scd)
370 self->status = SENDER_OFF;
373 del_close_on_fork_list(server_fd);
376 http_shutdown_clients();
380 static void del_perm_list_entry(struct sender_command_data *scd)
382 struct access_info *ai, *tmp;
384 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
385 char *nad = para_strdup(inet_ntoa(ai->addr));
386 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
387 ai->netmask == scd->netmask) {
388 PARA_NOTICE_LOG("removing %s/%i from access list\n",
397 static void add_perm_list_entry(struct sender_command_data *scd)
399 struct access_info *ai = para_malloc(sizeof(struct access_info));
400 ai->addr = scd->addr;
401 ai->netmask = scd->netmask;
402 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
404 para_list_add(&ai->node, &access_perm_list);
407 static int http_com_deny(struct sender_command_data *scd)
409 if (conf.http_default_deny_given)
410 del_perm_list_entry(scd);
412 add_perm_list_entry(scd);
416 static int http_com_allow(struct sender_command_data *scd)
418 if (conf.http_default_deny_given)
419 add_perm_list_entry(scd);
421 del_perm_list_entry(scd);
425 static char *http_info(void)
427 char *clnts = NULL, *ap = NULL, *ret;
428 struct access_info *ai, *tmp_ai;
429 struct http_client *hc, *tmp_hc;
431 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
432 char *tmp = make_message("%s%s/%d ", ap? ap : "",
433 inet_ntoa(ai->addr), ai->netmask);
437 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
438 char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
444 "http tcp port: %d\n"
446 "http maximal number of clients: %d%s\n"
447 "http connected clients: %s\n"
448 "http access %s list: %s\n",
449 (self->status == SENDER_ON)? "on" : "off",
452 conf.http_max_clients_arg,
453 conf.http_max_clients_arg > 0? "" : " (unlimited)",
454 clnts? clnts : "(none)",
455 conf.http_default_deny_given? "allow" : "deny",
463 static void init_access_control_list(void)
466 struct sender_command_data scd;
468 INIT_LIST_HEAD(&access_perm_list);
469 for (i = 0; i < conf.http_access_given; i++) {
470 char *arg = para_strdup(conf.http_access_arg[i]);
471 char *p = strchr(arg, '/');
475 if (!inet_pton(AF_INET, arg, &scd.addr))
477 scd.netmask = atoi(++p);
478 if (scd.netmask < 0 || scd.netmask > 32)
480 add_perm_list_entry(&scd);
483 PARA_CRIT_LOG("syntax error for http_access option "
484 "#%d, ignoring\n", i);
491 static char *http_help(void)
495 "usage: {allow|deny} IP mask\n"
496 "example: allow 127.0.0.1 32\n"
501 * The init function of the http sender.
503 * \param s Pointer to the http sender struct.
505 * It initializes all function pointers of \a s, the client list and the access
506 * control list. If the autostart option was given, the tcp port is opened.
508 void http_send_init(struct sender *s)
510 INIT_LIST_HEAD(&clients);
513 s->pre_select = http_pre_select;
514 s->post_select = http_post_select;
515 s->shutdown_clients = http_shutdown_clients;
517 s->client_cmds[SENDER_ON] = http_com_on;
518 s->client_cmds[SENDER_OFF] = http_com_off;
519 s->client_cmds[SENDER_DENY] = http_com_deny;
520 s->client_cmds[SENDER_ALLOW] = http_com_allow;
521 s->client_cmds[SENDER_ADD] = NULL;
522 s->client_cmds[SENDER_DELETE] = NULL;
524 init_access_control_list();
525 if (!conf.http_no_autostart_given)
526 open_tcp_port(conf.http_port_arg); /* ignore errors */
527 PARA_DEBUG_LOG("%s", "http sender init complete\n");