-/*
- * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file http_send.c paraslash's http sender */
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <regex.h>
#include <sys/types.h>
-#include <dirent.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <netdb.h>
+#include <lopsub.h>
+#include "server.lsg.h"
#include "para.h"
#include "error.h"
#include "string.h"
-#include "server.cmdline.h"
#include "afh.h"
-#include "afs.h"
+#include "net.h"
#include "server.h"
#include "http.h"
-#include "vss.h"
-#include "send.h"
#include "list.h"
+#include "send.h"
+#include "sched.h"
+#include "vss.h"
#include "close_on_fork.h"
-#include "net.h"
#include "fd.h"
#include "chunk_queue.h"
-#include "acl.h"
/** Message sent to clients that do not send a valid get request. */
#define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
-
/** The possible states of a client from the server's POV. */
-enum http_status {
+enum http_client_status {
/** We accepted the connection on the tcp socket. */
HTTP_CONNECTED,
/** Successfully received the get request. */
HTTP_GOT_GET_REQUEST,
- /** We sent the OK message back to the client. */
- HTTP_SENT_OK_MSG,
- /** Connection established, we might need to send the audio file header. */
- HTTP_READY_TO_STREAM,
/** Connection is ready for sending audio data. */
HTTP_STREAMING,
/** We didn't receive a valid get request. */
HTTP_INVALID_GET_REQUEST
};
-/** Clients will be kicked if there are more than that many bytes pending. */
-#define MAX_BACKLOG 400000
-/** The list of connected clients. */
-static struct list_head clients;
-/** The whitelist/blacklist. */
-static struct list_head http_acl;
-
-/** Describes one client that connected the tcp port of the http sender. */
-struct http_client {
- /** The file descriptor of the client. */
- int fd;
- /** The socket `name' of the client. */
- char *name;
- /** The client's current status. */
- enum http_status status;
- /** Non-zero if we included \a fd in the read set.*/
- int check_r;
- /** Non-zero if we included \a fd in the write set. */
- int check_w;
- /** The position of this client in the client list. */
- struct list_head node;
- /** The list of pending chunks for this client. */
- struct chunk_queue *cq;
+/** For each connected client, a structure of this type is maintained. */
+struct private_http_sender_data {
+ /** The current state of this client. */
+ enum http_client_status status;
};
-static int listen_fd = -1, numclients;
-static struct sender *self;
+static struct sender_status http_sender_status, *hss = &http_sender_status;
-
-static void http_shutdown_client(struct http_client *hc, const char *msg)
+static int http_send_msg(struct sender_client *sc, const char *msg)
{
- PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", hc->name, hc->fd,
- msg);
- numclients--;
- free(hc->name);
- close(hc->fd);
- del_close_on_fork_list(hc->fd);
- cq_destroy(hc->cq);
- list_del(&hc->node);
- free(hc);
-}
+ int ret = write_buffer(sc->fd, msg);
-static void http_shutdown_clients(void)
-{
- struct http_client *hc, *tmp;
- list_for_each_entry_safe(hc, tmp, &clients, node)
- http_shutdown_client(hc, "vss request");
+ if (ret < 0)
+ shutdown_client(sc, hss);
+ return ret;
}
-static int http_send_msg(struct http_client *hc, const char *msg)
+static void http_send_ok_msg(struct sender_client *sc)
{
- int ret = send_buffer(hc->fd, msg);
-
- if (ret < 0)
- http_shutdown_client(hc, "send msg failed");
- return ret;
+ PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
+ http_send_msg(sc, HTTP_OK_MSG);
}
-static void http_send_ok_msg(struct http_client *hc)
+static int http_send_err_msg(struct sender_client *sc)
{
- PARA_INFO_LOG("sending http ok message to fd %d\n", hc->fd);
- http_send_msg(hc, HTTP_OK_MSG);
+ PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
+ return http_send_msg(sc, HTTP_ERR_MSG);
}
-static int http_send_err_msg(struct http_client *hc)
+static void http_shutdown_clients(void)
{
- PARA_NOTICE_LOG("sending bad request message to fd %d\n", hc->fd);
- return http_send_msg(hc, HTTP_ERR_MSG);
+ shutdown_clients(hss);
}
-static int send_queued_chunks(struct http_client *hc)
+static void http_shutdown(void)
{
- struct queued_chunk *qc;
- while ((qc = cq_peek(hc->cq))) {
- char *buf;
- size_t len;
- int ret = write_ok(hc->fd);
- if (ret <= 0)
- return ret? -E_WRITE_OK : 0;
- cq_get(qc, &buf, &len);
- ret = write(hc->fd, buf, len);
- if (ret < 0)
- return -E_SEND_QUEUED_CHUNK;
- cq_update(hc->cq, ret);
- if (ret != len)
- return 1;
- cq_dequeue(hc->cq);
- }
- return 1;
+ http_shutdown_clients();
+ generic_acl_deplete(&hss->acl);
}
-static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
- size_t sent)
+static int queue_chunk_or_shutdown(struct sender_client *sc,
+ struct sender_status *ss, const char *buf, size_t num_bytes)
{
- int ret = cq_enqueue(hc->cq, chunk_num, sent);
+ int ret = cq_enqueue(sc->cq, buf, num_bytes);
if (ret < 0)
- http_shutdown_client(hc, "queue error");
+ shutdown_client(sc, ss);
return ret;
}
-static void http_send( long unsigned current_chunk,
- __a_unused long unsigned chunks_sent, const char *buf, size_t len)
+/**
+ * Send one chunk of audio data to a connected client.
+ *
+ * \param sc The client.
+ * \param ss The sender.
+ * \param current_chunk The number of the chunk to write.
+ * \param buf The data to write.
+ * \param len The number of bytes of \a buf.
+ * \param header_buf The audio file header.
+ * \param header_len The number of bytes of \a header_buf.
+ *
+ * On errors, the client is shut down. If only a part of the buffer could be
+ * written, the remainder is put into the chunk queue for that client.
+ */
+static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
+ long unsigned current_chunk, const char *buf, size_t len,
+ const char *header_buf, size_t header_len)
{
- struct http_client *hc, *tmp;
int ret;
- list_for_each_entry_safe(hc, tmp, &clients, node) {
- if (hc->status != HTTP_STREAMING &&
- hc->status != HTTP_READY_TO_STREAM)
- continue;
- if (hc->status == HTTP_READY_TO_STREAM) {
- size_t hlen;
- char *hbuf = vss_get_header(&hlen);
- if (hbuf && hlen > 0 && current_chunk) {
- /* need to send header */
- PARA_INFO_LOG("queueing header: %zu\n", hlen);
- if (queue_chunk_or_shutdown(hc, -1U, 0) < 0)
- continue;
- } else
- PARA_INFO_LOG("no need to queue header\n");
- hc->status = HTTP_STREAMING;
- }
- ret = send_queued_chunks(hc);
- if (ret < 0) {
- http_shutdown_client(hc, "queue send error");
- continue;
+ if (!sc->header_sent && current_chunk) {
+ if (header_buf && header_len > 0) {
+ ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
+ if (ret < 0)
+ goto out;
}
- if (!len)
- continue;
- if (!ret || write_ok(hc->fd) <= 0) {
- queue_chunk_or_shutdown(hc, current_chunk, 0);
- continue;
- }
-// PARA_DEBUG_LOG("sending %d -> %s\n", len, remote_name(hc->fd));
- ret = write(hc->fd, buf, len);
-// PARA_DEBUG_LOG("ret: %d\n", ret);
- if (ret < 0) {
- http_shutdown_client(hc, "send error");
- continue;
- }
- if (ret != len)
- queue_chunk_or_shutdown(hc, current_chunk, ret);
}
+ sc->header_sent = 1;
+ ret = send_queued_chunks(sc->fd, sc->cq);
+ if (ret < 0) {
+ shutdown_client(sc, ss);
+ goto out;
+ }
+ if (!len)
+ goto out;
+ if (!ret) { /* still data left in the queue */
+ ret = queue_chunk_or_shutdown(sc, ss, buf, len);
+ goto out;
+ }
+ ret = xwrite(sc->fd, buf, len);
+ if (ret < 0) {
+ shutdown_client(sc, ss);
+ goto out;
+ }
+ if (ret != len)
+ ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
+out:
+ if (ret < 0)
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
}
-static void http_post_select(fd_set *rfds, fd_set *wfds)
+static void http_send(long unsigned current_chunk,
+ __a_unused long unsigned chunks_sent, const char *buf, size_t len,
+ const char *header_buf, size_t header_len)
{
- int i = -1, match;
- struct http_client *hc, *tmp;
- const char *err_msg;
+ struct sender_client *sc, *tmp;
- if (listen_fd < 0)
- return;
- list_for_each_entry_safe(hc, tmp, &clients, node) {
- i++;
-// PARA_DEBUG_LOG("handling client %d: %s\n", i, remote_name(hc->fd));
- switch (hc->status) {
- case HTTP_STREAMING: /* nothing to do */
- case HTTP_READY_TO_STREAM:
- break;
- case HTTP_CONNECTED: /* need to recv get request */
- if (hc->check_r && FD_ISSET(hc->fd, rfds)) {
- if (recv_pattern(hc->fd, HTTP_GET_MSG, MAXLINE)
- < 0) {
- hc->status = HTTP_INVALID_GET_REQUEST;
- } else {
- hc->status = HTTP_GOT_GET_REQUEST;
- PARA_INFO_LOG("%s",
- "received get request\n");
- }
- }
- break;
- case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
- if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
- hc->status = HTTP_SENT_OK_MSG;
- http_send_ok_msg(hc);
- }
- break;
- case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
- if (hc->check_w && FD_ISSET(hc->fd, wfds)) {
- if (http_send_err_msg(hc) >= 0)
- http_shutdown_client(hc,
- "invalid get request");
- }
- break;
- case HTTP_SENT_OK_MSG: /* need to send header? */
- if (hc->check_w && FD_ISSET(hc->fd, wfds))
- hc->status = HTTP_READY_TO_STREAM;
- break;
- }
- }
- if (!FD_ISSET(listen_fd, rfds))
- return;
- hc = para_calloc(sizeof(struct http_client));
- err_msg = "accept error";
- hc->fd = para_accept(listen_fd, NULL, 0);
- if (hc->fd <= 0)
- goto err_out;
- hc->name = make_message("%s", remote_name(hc->fd));
- PARA_NOTICE_LOG("connection from %s (fd %d)\n", hc->name, hc->fd);
- if (conf.http_max_clients_arg > 0 && numclients >=
- conf.http_max_clients_arg) {
- err_msg = "server full";
- goto err_out;
- }
- match = acl_lookup(hc->fd, &http_acl);
- PARA_DEBUG_LOG("acl lookup returned %d\n", match);
- if ((match && !conf.http_default_deny_given) ||
- (!match && conf.http_default_deny_given)) {
- err_msg = "permission denied";
- goto err_out;
+ list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
+ struct private_http_sender_data *phsd = sc->private_data;
+
+ if (phsd->status == HTTP_STREAMING)
+ http_send_chunk(sc, hss, current_chunk, buf, len,
+ header_buf, header_len);
}
- hc->status = HTTP_CONNECTED;
- hc->cq = cq_new(MAX_BACKLOG);
- numclients++;
- PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
- hc->name, hc->fd);
- para_list_add(&hc->node, &clients);
- add_close_on_fork_list(hc->fd);
- mark_fd_nonblocking(hc->fd);
- return;
-err_out:
- PARA_WARNING_LOG("ignoring connect request from %s (%s)\n",
- hc->name, err_msg);
- if (hc->fd > 0)
- close(hc->fd);
- free(hc);
}
-static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
+static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
{
- struct http_client *hc, *tmp;
+ struct sender_client *sc, *tmp;
+ struct private_http_sender_data *phsd;
+ int ret;
- if (listen_fd < 0)
- return;
- para_fd_set(listen_fd, rfds, max_fileno);
- list_for_each_entry_safe(hc, tmp, &clients, node) {
- //PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
- hc->check_r = 0;
- hc->check_w = 0;
- switch (hc->status) {
- case HTTP_STREAMING:
- case HTTP_READY_TO_STREAM:
+ list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
+ phsd = sc->private_data;
+ switch (phsd->status) {
+ case HTTP_STREAMING: /* nothing to do */
break;
case HTTP_CONNECTED: /* need to recv get request */
- para_fd_set(hc->fd, rfds, max_fileno);
- hc->check_r = 1;
+ ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
+ if (ret < 0)
+ phsd->status = HTTP_INVALID_GET_REQUEST;
+ else if (ret > 0) {
+ phsd->status = HTTP_GOT_GET_REQUEST;
+ PARA_INFO_LOG("received get request\n");
+ }
break;
case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
- case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
- para_fd_set(hc->fd, wfds, max_fileno);
- hc->check_w = 1;
+ phsd->status = HTTP_STREAMING;
+ http_send_ok_msg(sc);
break;
- case HTTP_SENT_OK_MSG:
- if (!vss_playing())
- break; /* wait until server starts playing */
- para_fd_set(hc->fd, wfds, max_fileno);
- hc->check_w = 1;
+ case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
+ if (http_send_err_msg(sc) >= 0)
+ shutdown_client(sc, hss);
break;
}
}
+ sc = accept_sender_client(hss, rfds);
+ if (!sc)
+ return;
+ phsd = para_malloc(sizeof(*phsd));
+ sc->private_data = phsd;
+ phsd->status = HTTP_CONNECTED;
}
-static int http_open(int port)
+static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
{
- int ret;
+ struct sender_client *sc, *tmp;
+ unsigned n;
- listen_fd = para_listen(AF_UNSPEC, IPPROTO_TCP, port);
- if (listen_fd < 0) {
- http_shutdown_clients();
- return listen_fd;
+ FOR_EACH_LISTEN_FD(n, hss) {
+ if (hss->listen_fds[n] < 0)
+ continue;
+ para_fd_set(hss->listen_fds[n], rfds, max_fileno);
}
- ret = mark_fd_nonblocking(listen_fd);
- if (ret < 0) {
- PARA_EMERG_LOG("%s\n", para_strerror(-ret));
- exit(EXIT_FAILURE);
+ list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
+ struct private_http_sender_data *phsd = sc->private_data;
+ if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
+ para_fd_set(sc->fd, rfds, max_fileno);
+ if (phsd->status == HTTP_GOT_GET_REQUEST ||
+ phsd->status == HTTP_INVALID_GET_REQUEST)
+ para_fd_set(sc->fd, wfds, max_fileno);
}
- add_close_on_fork_list(listen_fd);
- return 1;
}
static int http_com_on(__a_unused struct sender_command_data *scd)
{
- if (listen_fd >= 0)
- return 1;
- return http_open(conf.http_port_arg);
+ generic_com_on(hss, IPPROTO_TCP);
+ return 1;
}
static int http_com_off(__a_unused struct sender_command_data *scd)
{
- if (listen_fd < 0)
- return 1;
- PARA_NOTICE_LOG("closing http port %d\n", conf.http_port_arg);
- close(listen_fd);
- del_close_on_fork_list(listen_fd);
- http_shutdown_clients();
- listen_fd = -1;
+ generic_com_off(hss);
return 1;
}
static int http_com_deny(struct sender_command_data *scd)
{
- if (conf.http_default_deny_given)
- acl_del_entry(&http_acl, scd->addr, scd->netmask);
- else
- acl_add_entry(&http_acl, scd->addr, scd->netmask);
+ generic_com_deny(scd, hss);
return 1;
}
static int http_com_allow(struct sender_command_data *scd)
{
- if (conf.http_default_deny_given)
- acl_add_entry(&http_acl, scd->addr, scd->netmask);
- else
- acl_del_entry(&http_acl, scd->addr, scd->netmask);
+ generic_com_allow(scd, hss);
return 1;
}
-static char *http_info(void)
+static char *http_status(void)
{
- char *clnts = NULL, *ret;
- struct http_client *hc, *tmp_hc;
-
- char *acl_contents = acl_get_contents(&http_acl);
- list_for_each_entry_safe(hc, tmp_hc, &clients, node) {
- char *tmp = make_message("%s%s ", clnts? clnts : "", hc->name);
- free(clnts);
- clnts = tmp;
- }
- ret = make_message(
- "http status: %s\n"
- "http tcp port: %d\n"
- "http clients: %d\n"
- "http maximal number of clients: %d%s\n"
- "http connected clients: %s\n"
- "http access %s list: %s\n",
- (listen_fd >= 0)? "on" : "off",
- conf.http_port_arg,
- numclients,
- conf.http_max_clients_arg,
- conf.http_max_clients_arg > 0? "" : " (unlimited)",
- clnts? clnts : "(none)",
- conf.http_default_deny_given? "allow" : "deny",
- acl_contents? acl_contents : "(none)"
- );
- free(acl_contents);
- free(clnts);
- return ret;
+ return generic_sender_status(hss, "http");
}
-static char *http_help(void)
+/*
+ * Initialize the client list and the access control list, and optionally
+ * listen on the tcp port.
+ */
+static void http_send_init(void)
{
- return make_message(
- "usage: {on|off}\n"
- "usage: {allow|deny} IP mask\n"
- "example: allow 127.0.0.1 32\n"
- );
+ init_sender_status(hss, OPT_RESULT(HTTP_ACCESS),
+ OPT_RESULT(HTTP_LISTEN_ADDRESS),
+ OPT_UINT32_VAL(HTTP_PORT), OPT_UINT32_VAL(HTTP_MAX_CLIENTS),
+ OPT_GIVEN(HTTP_DEFAULT_DENY));
+ if (OPT_GIVEN(HTTP_NO_AUTOSTART))
+ return;
+ generic_com_on(hss, IPPROTO_TCP);
}
/**
- * The init function of the http sender.
- *
- * \param s Pointer to the http sender struct.
+ * The HTTP sender.
*
- * It initializes all function pointers of \a s, the client list and the access
- * control list. If the autostart option was given, the tcp port is opened.
+ * This is the only sender which does not FEC-encode the stream. This is not
+ * necessary because HTTP sits on top of TCP, a reliable transport which
+ * retransmits lost packets automatically. The sender employs per-client queues
+ * which queue chunks of audio data if they can not be sent immediately because
+ * the write operation would block. Most methods of the sender are implemented
+ * as wrappers for the generic functions defined in \ref send_common.c.
*/
-void http_send_init(struct sender *s)
-{
- INIT_LIST_HEAD(&clients);
- s->info = http_info;
- s->send = http_send;
- s->pre_select = http_pre_select;
- s->post_select = http_post_select;
- s->shutdown_clients = http_shutdown_clients;
- s->help = http_help;
- s->client_cmds[SENDER_ON] = http_com_on;
- s->client_cmds[SENDER_OFF] = http_com_off;
- s->client_cmds[SENDER_DENY] = http_com_deny;
- s->client_cmds[SENDER_ALLOW] = http_com_allow;
- s->client_cmds[SENDER_ADD] = NULL;
- s->client_cmds[SENDER_DELETE] = NULL;
- self = s;
- acl_init(&http_acl, conf.http_access_arg, conf.http_access_given);
- if (!conf.http_no_autostart_given)
- http_open(conf.http_port_arg); /* ignore errors */
- PARA_DEBUG_LOG("%s", "http sender init complete\n");
-}
+const struct sender http_sender = {
+ .name = "http",
+ .init = http_send_init,
+ .shutdown = http_shutdown,
+ .pre_select = http_pre_select,
+ .post_select = http_post_select,
+ .send = http_send,
+ .shutdown_clients = http_shutdown_clients,
+ .client_cmds = {
+ [SENDER_on] = http_com_on,
+ [SENDER_off] = http_com_off,
+ [SENDER_deny] = http_com_deny,
+ [SENDER_allow] = http_com_allow,
+ },
+ .help = generic_sender_help,
+ .status = http_status,
+};
projects / paraslash.git / blobdiff