http_send.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file http_send.c paraslash's http sender */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "string.h"
  16 #include "server.cmdline.h"
  17 #include "afh.h"
  18 #include "afs.h"
  19 #include "server.h"
  20 #include "http.h"
  21 #include "vss.h"
  22 #include "list.h"
  23 #include "send.h"
  24 #include "close_on_fork.h"
  25 #include "net.h"
  26 #include "fd.h"
  27 #include "chunk_queue.h"
  28 #include "acl.h"
  29
  30 /** Message sent to clients that do not send a valid get request. */
  31 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  32
  33 /** The possible states of a client from the server's POV. */
  34 enum http_client_status {
  35         /** We accepted the connection on the tcp socket. */
  36         HTTP_CONNECTED,
  37         /** Successfully received the get request. */
  38         HTTP_GOT_GET_REQUEST,
  39         /** Connection is ready for sending audio data. */
  40         HTTP_STREAMING,
  41         /** We didn't receive a valid get request. */
  42         HTTP_INVALID_GET_REQUEST
  43 };
  44
  45 /** For each connected client, a structure of this type is maintained. */
  46 struct private_http_sender_data {
  47         /** The current state of this client. */
  48         enum http_client_status status;
  49 };
  50
  51 static struct sender_status http_sender_status, *hss = &http_sender_status;
  52
  53 static int http_send_msg(struct sender_client *sc, const char *msg)
  54 {
  55         int ret = send_buffer(sc->fd, msg);
  56
  57         if (ret < 0)
  58                 shutdown_client(sc, hss);
  59         return ret;
  60 }
  61
  62 static void http_send_ok_msg(struct sender_client *sc)
  63 {
  64         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  65         http_send_msg(sc, HTTP_OK_MSG);
  66 }
  67
  68 static int http_send_err_msg(struct sender_client *sc)
  69 {
  70         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  71         return http_send_msg(sc, HTTP_ERR_MSG);
  72 }
  73
  74 static void http_shutdown_clients(void)
  75 {
  76         shutdown_clients(hss);
  77 }
  78
  79 static void http_send(long unsigned current_chunk,
  80         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
  81         const char *header_buf, size_t header_len)
  82 {
  83         struct sender_client *sc, *tmp;
  84
  85         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  86                 struct private_http_sender_data *phsd = sc->private_data;
  87                 if (phsd->status != HTTP_STREAMING)
  88                         continue;
  89                 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
  90                         header_len);
  91         }
  92 }
  93
  94 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  95 {
  96         struct sender_client *sc, *tmp;
  97         struct private_http_sender_data *phsd;
  98
  99         if (hss->listen_fd < 0)
 100                 return;
 101         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 102                 phsd = sc->private_data;
 103                 switch (phsd->status) {
 104                 case HTTP_STREAMING: /* nothing to do */
 105                         break;
 106                 case HTTP_CONNECTED: /* need to recv get request */
 107                         if (FD_ISSET(sc->fd, rfds)) {
 108                                 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
 109                                                 < 0) {
 110                                         phsd->status = HTTP_INVALID_GET_REQUEST;
 111                                 } else {
 112                                         phsd->status = HTTP_GOT_GET_REQUEST;
 113                                         PARA_INFO_LOG("received get request\n");
 114                                 }
 115                         }
 116                         break;
 117                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 118                         phsd->status = HTTP_STREAMING;
 119                         http_send_ok_msg(sc);
 120                         break;
 121                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 122                         if (http_send_err_msg(sc) >= 0)
 123                                 shutdown_client(sc, hss);
 124                         break;
 125                 }
 126         }
 127         if (!FD_ISSET(hss->listen_fd, rfds))
 128                 return;
 129         sc = accept_sender_client(hss);
 130         if (!sc)
 131                 return;
 132         phsd = para_malloc(sizeof(*phsd));
 133         sc->private_data = phsd;
 134         phsd->status = HTTP_CONNECTED;
 135 }
 136
 137 static void http_pre_select(int *max_fileno, fd_set *rfds, __a_unused fd_set *wfds)
 138 {
 139         struct sender_client *sc, *tmp;
 140
 141         if (hss->listen_fd < 0)
 142                 return;
 143         para_fd_set(hss->listen_fd, rfds, max_fileno);
 144         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 145                 struct private_http_sender_data *phsd = sc->private_data;
 146                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 147                         para_fd_set(sc->fd, rfds, max_fileno);
 148         }
 149 }
 150
 151 static int http_com_on(__a_unused struct sender_command_data *scd)
 152 {
 153         return generic_com_on(hss, IPPROTO_TCP);
 154 }
 155
 156 static int http_com_off(__a_unused struct sender_command_data *scd)
 157 {
 158         generic_com_off(hss);
 159         return 1;
 160 }
 161
 162 static int http_com_deny(struct sender_command_data *scd)
 163 {
 164         generic_com_deny(scd, hss);
 165         return 1;
 166 }
 167
 168 static int http_com_allow(struct sender_command_data *scd)
 169 {
 170         generic_com_allow(scd, hss);
 171         return 1;
 172 }
 173
 174 static char *http_info(void)
 175 {
 176         return get_sender_info(hss, "http");
 177 }
 178
 179 /**
 180  * The init function of the http sender.
 181  *
 182  * \param s Pointer to the http sender struct.
 183  *
 184  * It initializes all function pointers of \a s, the client list and the access
 185  * control list. If the autostart option was given, the tcp port is opened.
 186  */
 187 void http_send_init(struct sender *s)
 188 {
 189         int ret;
 190         s->info = http_info;
 191         s->send = http_send;
 192         s->pre_select = http_pre_select;
 193         s->post_select = http_post_select;
 194         s->shutdown_clients = http_shutdown_clients;
 195         s->help = generic_sender_help;
 196         s->client_cmds[SENDER_ON] = http_com_on;
 197         s->client_cmds[SENDER_OFF] = http_com_off;
 198         s->client_cmds[SENDER_DENY] = http_com_deny;
 199         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 200         s->client_cmds[SENDER_ADD] = NULL;
 201         s->client_cmds[SENDER_DELETE] = NULL;
 202
 203         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 204                 conf.http_port_arg, conf.http_max_clients_arg,
 205                 conf.http_default_deny_given);
 206         if (conf.http_no_autostart_given)
 207                 return;
 208         ret = generic_com_on(hss, IPPROTO_TCP);
 209         if (ret < 0)
 210                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 211 }