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 */
10 #include "server.cmdline.h"
16 #include "close_on_fork.h"
21 #include "chunk_queue.h"
23 /** \cond convert sock_addr_in to ascii */
24 #define CLIENT_ADDR(hc) inet_ntoa((hc)->addr.sin_addr)
25 /* get the port number of a struct http_client */
26 #define CLIENT_PORT(hc) (hc)->addr.sin_port
27 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
30 /** The possible states of a client from the server's POV. */
32 /** We accepted the connection on the tcp socket. */
34 /** Successfully received the get request. */
36 /** We sent the OK message back to the client. */
38 /** Connection established, we might need to send the audio file header. */
40 /** Connection is ready for sending audio data. */
42 /** We didn't receive a valid get request. */
43 HTTP_INVALID_GET_REQUEST
46 /** Clients will be kicked if there are more than that many bytes pending. */
47 #define MAX_BACKLOG 400000
48 /** The list of connected clients. */
49 static struct list_head clients;
50 /** The whitelist/blacklist. */
51 static struct list_head access_perm_list;
53 /** Describes one client that connected the tcp port of the http sender. */
55 /** The file descriptor of the client. */
57 /** Address information about the client. */
58 struct sockaddr_in addr;
59 /** The client's current status. */
60 enum http_status status;
61 /** Non-zero if we included \a fd in the read set.*/
63 /** Non-zero if we included \a fd in the write set. */
65 /** The position of this client in the client list. */
66 struct list_head node;
67 /** The list of pending chunks for this client. */
68 struct chunk_queue *cq;
72 * Describes one entry in the blacklist/whitelist of the http sender.
75 /** The address to be black/whitelisted. */
77 /** The netmask for this entry. */
79 /** The position of this entry in the access_perm_list. */
80 struct list_head node;
83 static int server_fd = -1, numclients;
84 static struct sender *self;
87 static void http_shutdown_client(struct http_client *hc, const char *msg)
89 PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
93 del_close_on_fork_list(hc->fd);
99 static void http_shutdown_clients(void)
101 struct http_client *hc, *tmp;
102 list_for_each_entry_safe(hc, tmp, &clients, node)
103 http_shutdown_client(hc, "vss request");
106 static int http_send_msg(struct http_client *hc, const char *msg)
108 int ret = send_buffer(hc->fd, msg);
111 http_shutdown_client(hc, "send msg failed");
115 static void http_send_ok_msg(struct http_client *hc)
117 PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
118 http_send_msg(hc, HTTP_OK_MSG);
121 static int http_send_err_msg(struct http_client *hc)
123 PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
124 return http_send_msg(hc, HTTP_ERR_MSG);
127 static int send_queued_chunks(struct http_client *hc)
129 struct queued_chunk *qc;
130 while ((qc = cq_peek(hc->cq))) {
133 int ret = write_ok(hc->fd);
135 return ret? -E_WRITE_OK : 0;
136 cq_get(qc, &buf, &len);
137 ret = write(hc->fd, buf, len);
139 return -E_SEND_QUEUED_CHUNK;
140 cq_update(hc->cq, ret);
148 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
151 int ret = cq_enqueue(hc->cq, chunk_num, sent);
153 http_shutdown_client(hc, "queue error");
157 static void http_send( long unsigned current_chunk,
158 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
160 struct http_client *hc, *tmp;
163 list_for_each_entry_safe(hc, tmp, &clients, node) {
164 if (hc->status != HTTP_STREAMING &&
165 hc->status != HTTP_READY_TO_STREAM)
167 if (hc->status == HTTP_READY_TO_STREAM) {
169 char *hbuf = vss_get_header(&hlen);
170 if (hbuf && hlen > 0 && current_chunk) {
171 /* need to send header */
172 PARA_INFO_LOG("queueing header: %zu\n", hlen);
173 if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
176 PARA_INFO_LOG("no need to queue header\n");
177 hc->status = HTTP_STREAMING;
179 ret = send_queued_chunks(hc);
181 http_shutdown_client(hc, "queue send error");
186 if (!ret || write_ok(hc->fd) <= 0) {
187 queue_chunk_or_shutdown(hc, current_chunk, 0);
190 // PARA_DEBUG_LOG("sending %d -> %s\n", len, CLIENT_ADDR(hc));
191 ret = write(hc->fd, buf, len);
192 // PARA_DEBUG_LOG("ret: %d\n", ret);
194 http_shutdown_client(hc, "send error");
198 queue_chunk_or_shutdown(hc, current_chunk, ret);
202 static int host_in_access_perm_list(struct http_client *hc)
204 struct access_info *ai, *tmp;
205 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
206 unsigned mask = ((~0U) >> ai->netmask);
207 if ((hc->addr.sin_addr.s_addr & mask) == (ai->addr.s_addr & mask))
213 static void http_post_select(fd_set *rfds, fd_set *wfds)
216 struct http_client *hc, *tmp;
219 list_for_each_entry_safe(hc, tmp, &clients, node) {
221 // PARA_DEBUG_LOG("handling client %d: %s\n", i, CLIENT_ADDR(hc));
222 switch (hc->status) {
223 case HTTP_STREAMING: /* nothing to do */
224 case HTTP_READY_TO_STREAM:
226 case HTTP_CONNECTED: /* need to recv get request */
227 if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
228 if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
230 hc->status = HTTP_INVALID_GET_REQUEST;
232 hc->status = HTTP_GOT_GET_REQUEST;
234 "received get request\n");
238 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
239 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
240 hc->status = HTTP_SENT_OK_MSG;
241 http_send_ok_msg(hc);
244 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
245 if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
246 if (http_send_err_msg(hc) >= 0)
247 http_shutdown_client(hc,
248 "invalid get request");
251 case HTTP_SENT_OK_MSG: /* need to send header? */
252 if (hc->check_w && FD_ISSET(hc->fd, wfds))
253 hc->status = HTTP_READY_TO_STREAM;
257 if (!FD_ISSET(server_fd, rfds))
259 hc = para_calloc(sizeof(struct http_client));
260 err_msg = "accept error";
261 hc->fd = para_accept(server_fd, &hc->addr, sizeof(struct sockaddr_in));
264 PARA_NOTICE_LOG("connection from %s (fd %d)\n", CLIENT_ADDR(hc), hc->fd);
265 if (conf.http_max_clients_arg > 0 && numclients >=
266 conf.http_max_clients_arg) {
267 err_msg = "server full";
270 match = host_in_access_perm_list(hc);
271 PARA_DEBUG_LOG("host_in_access_perm_list: %d\n", match);
272 if ((match && !conf.http_default_deny_given) ||
273 (!match && conf.http_default_deny_given)) {
274 err_msg = "permission denied";
277 hc->status = HTTP_CONNECTED;
278 hc->cq = cq_new(MAX_BACKLOG);
279 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
280 CLIENT_ADDR(hc), hc->fd);
282 para_list_add(&hc->node, &clients);
283 add_close_on_fork_list(hc->fd);
284 mark_fd_nonblock(hc->fd);
287 PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
288 CLIENT_ADDR(hc), err_msg);
294 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
296 struct http_client *hc, *tmp;
300 para_fd_set(server_fd, rfds, max_fileno);
301 list_for_each_entry_safe(hc, tmp, &clients, node) {
302 //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
305 switch (hc->status) {
307 case HTTP_READY_TO_STREAM:
309 case HTTP_CONNECTED: /* need to recv get request */
310 para_fd_set(hc->fd, rfds, max_fileno);
313 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
314 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
315 para_fd_set(hc->fd, wfds, max_fileno);
318 case HTTP_SENT_OK_MSG:
320 break; /* wait until server starts playing */
321 para_fd_set(hc->fd, wfds, max_fileno);
328 static int open_tcp_port(int port)
332 server_fd = init_tcp_socket(port);
334 http_shutdown_clients();
335 self->status = SENDER_OFF;
338 ret = mark_fd_nonblock(server_fd);
340 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
343 self->status = SENDER_ON;
344 add_close_on_fork_list(server_fd);
348 static int http_com_on(__a_unused struct sender_command_data *scd)
350 if (self->status == SENDER_ON)
352 return open_tcp_port(conf.http_port_arg);
355 static int http_com_off(__a_unused struct sender_command_data *scd)
357 self->status = SENDER_OFF;
360 del_close_on_fork_list(server_fd);
363 http_shutdown_clients();
367 static void del_perm_list_entry(struct sender_command_data *scd)
369 struct access_info *ai, *tmp;
371 list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
372 char *nad = para_strdup(inet_ntoa(ai->addr));
373 if (!strcmp(nad, inet_ntoa(scd->addr)) &&
374 ai->netmask == scd->netmask) {
375 PARA_NOTICE_LOG("removing %s/%i from access list\n",
384 static void add_perm_list_entry(struct sender_command_data *scd)
386 struct access_info *ai = para_malloc(sizeof(struct access_info));
387 ai->addr = scd->addr;
388 ai->netmask = scd->netmask;
389 PARA_INFO_LOG("adding %s/%i to access list\n", inet_ntoa(ai->addr),
391 para_list_add(&ai->node, &access_perm_list);
394 static int http_com_deny(struct sender_command_data *scd)
396 if (conf.http_default_deny_given)
397 del_perm_list_entry(scd);
399 add_perm_list_entry(scd);
403 static int http_com_allow(struct sender_command_data *scd)
405 if (conf.http_default_deny_given)
406 add_perm_list_entry(scd);
408 del_perm_list_entry(scd);
412 static char *http_info(void)
414 char *clnts = NULL, *ap = NULL, *ret;
415 struct access_info *ai, *tmp_ai;
416 struct http_client *hc, *tmp_hc;
418 list_for_each_entry_safe(ai, tmp_ai, &access_perm_list, node) {
419 char *tmp = make_message("%s%s/%d ", ap? ap : "",
420 inet_ntoa(ai->addr), ai->netmask);
424 list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
425 char *tmp = make_message("%s%s:%d ", clnts? clnts : "",
426 CLIENT_ADDR(hc), CLIENT_PORT(hc));
432 "http tcp port: %d\n"
434 "http maximal number of clients: %d%s\n"
435 "http connected clients: %s\n"
436 "http access %s list: %s\n",
437 (self->status == SENDER_ON)? "on" : "off",
440 conf.http_max_clients_arg,
441 conf.http_max_clients_arg > 0? "" : " (unlimited)",
442 clnts? clnts : "(none)",
443 conf.http_default_deny_given? "allow" : "deny",
451 static void init_access_control_list(void)
454 struct sender_command_data scd;
456 INIT_LIST_HEAD(&access_perm_list);
457 for (i = 0; i < conf.http_access_given; i++) {
458 char *arg = para_strdup(conf.http_access_arg[i]);
459 char *p = strchr(arg, '/');
463 if (!inet_aton(arg, &scd.addr))
465 scd.netmask = atoi(++p);
466 if (scd.netmask < 0 || scd.netmask > 32)
468 add_perm_list_entry(&scd);
471 PARA_CRIT_LOG("syntax error for http_access option "
472 "#%d, ignoring\n", i);
479 static char *http_help(void)
483 "usage: {allow|deny} IP mask\n"
484 "example: allow 127.0.0.1 32\n"
489 * The init function of the http sender.
491 * \param s Pointer to the http sender struct.
493 * It initializes all function pointers of \a s, the client list and the access
494 * control list. If the autostart option was given, the tcp port is opened.
496 void http_send_init(struct sender *s)
498 INIT_LIST_HEAD(&clients);
501 s->pre_select = http_pre_select;
502 s->post_select = http_post_select;
503 s->shutdown_clients = http_shutdown_clients;
505 s->client_cmds[SENDER_ON] = http_com_on;
506 s->client_cmds[SENDER_OFF] = http_com_off;
507 s->client_cmds[SENDER_DENY] = http_com_deny;
508 s->client_cmds[SENDER_ALLOW] = http_com_allow;
509 s->client_cmds[SENDER_ADD] = NULL;
510 s->client_cmds[SENDER_DELETE] = NULL;
512 init_access_control_list();
513 if (!conf.http_no_autostart_given)
514 open_tcp_port(conf.http_port_arg); /* ignore errors */
515 PARA_DEBUG_LOG("%s", "http sender init complete\n");