http_send.c

   1 /*
   2  * Copyright (C) 2005-2010 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 <regex.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include <osl.h>
  13
  14 #include "para.h"
  15 #include "error.h"
  16 #include "string.h"
  17 #include "server.cmdline.h"
  18 #include "afh.h"
  19 #include "afs.h"
  20 #include "server.h"
  21 #include "http.h"
  22 #include "vss.h"
  23 #include "list.h"
  24 #include "send.h"
  25 #include "close_on_fork.h"
  26 #include "net.h"
  27 #include "fd.h"
  28 #include "chunk_queue.h"
  29 #include "acl.h"
  30
  31 /** Message sent to clients that do not send a valid get request. */
  32 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  33
  34 /** The possible states of a client from the server's POV. */
  35 enum http_client_status {
  36         /** We accepted the connection on the tcp socket. */
  37         HTTP_CONNECTED,
  38         /** Successfully received the get request. */
  39         HTTP_GOT_GET_REQUEST,
  40         /** Connection is ready for sending audio data. */
  41         HTTP_STREAMING,
  42         /** We didn't receive a valid get request. */
  43         HTTP_INVALID_GET_REQUEST
  44 };
  45
  46 /** For each connected client, a structure of this type is maintained. */
  47 struct private_http_sender_data {
  48         /** The current state of this client. */
  49         enum http_client_status status;
  50 };
  51
  52 static struct sender_status http_sender_status, *hss = &http_sender_status;
  53
  54 static int http_send_msg(struct sender_client *sc, const char *msg)
  55 {
  56         int ret = send_buffer(sc->fd, msg);
  57
  58         if (ret < 0)
  59                 shutdown_client(sc, hss);
  60         return ret;
  61 }
  62
  63 static void http_send_ok_msg(struct sender_client *sc)
  64 {
  65         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  66         http_send_msg(sc, HTTP_OK_MSG);
  67 }
  68
  69 static int http_send_err_msg(struct sender_client *sc)
  70 {
  71         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  72         return http_send_msg(sc, HTTP_ERR_MSG);
  73 }
  74
  75 static void http_shutdown_clients(void)
  76 {
  77         shutdown_clients(hss);
  78 }
  79
  80 static void http_send(long unsigned current_chunk,
  81         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
  82         const char *header_buf, size_t header_len)
  83 {
  84         struct sender_client *sc, *tmp;
  85
  86         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  87                 struct private_http_sender_data *phsd = sc->private_data;
  88                 if (phsd->status != HTTP_STREAMING)
  89                         continue;
  90                 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
  91                         header_len);
  92         }
  93 }
  94
  95 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  96 {
  97         struct sender_client *sc, *tmp;
  98         struct private_http_sender_data *phsd;
  99         int ret;
 100
 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                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 108                         if (ret < 0)
 109                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 110                         else if (ret > 0) {
 111                                 phsd->status = HTTP_GOT_GET_REQUEST;
 112                                 PARA_INFO_LOG("received get request\n");
 113                         }
 114                         break;
 115                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 116                         phsd->status = HTTP_STREAMING;
 117                         http_send_ok_msg(sc);
 118                         break;
 119                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 120                         if (http_send_err_msg(sc) >= 0)
 121                                 shutdown_client(sc, hss);
 122                         break;
 123                 }
 124         }
 125         sc = accept_sender_client(hss, rfds);
 126         if (!sc)
 127                 return;
 128         phsd = para_malloc(sizeof(*phsd));
 129         sc->private_data = phsd;
 130         phsd->status = HTTP_CONNECTED;
 131 }
 132
 133 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 134 {
 135         struct sender_client *sc, *tmp;
 136
 137         if (hss->listen_fd < 0)
 138                 return;
 139         para_fd_set(hss->listen_fd, rfds, max_fileno);
 140         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 141                 struct private_http_sender_data *phsd = sc->private_data;
 142                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 143                         para_fd_set(sc->fd, rfds, max_fileno);
 144                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 145                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 146                         para_fd_set(sc->fd, wfds, max_fileno);
 147         }
 148 }
 149
 150 static int http_com_on(__a_unused struct sender_command_data *scd)
 151 {
 152         return generic_com_on(hss, IPPROTO_TCP);
 153 }
 154
 155 static int http_com_off(__a_unused struct sender_command_data *scd)
 156 {
 157         generic_com_off(hss);
 158         return 1;
 159 }
 160
 161 static int http_com_deny(struct sender_command_data *scd)
 162 {
 163         generic_com_deny(scd, hss);
 164         return 1;
 165 }
 166
 167 static int http_com_allow(struct sender_command_data *scd)
 168 {
 169         generic_com_allow(scd, hss);
 170         return 1;
 171 }
 172
 173 static char *http_info(void)
 174 {
 175         return get_sender_info(hss, "http");
 176 }
 177
 178 /**
 179  * The init function of the http sender.
 180  *
 181  * \param s Pointer to the http sender struct.
 182  *
 183  * It initializes all function pointers of \a s, the client list and the access
 184  * control list. If the autostart option was given, the tcp port is opened.
 185  */
 186 void http_send_init(struct sender *s)
 187 {
 188         int ret;
 189         s->info = http_info;
 190         s->send = http_send;
 191         s->pre_select = http_pre_select;
 192         s->post_select = http_post_select;
 193         s->shutdown_clients = http_shutdown_clients;
 194         s->help = generic_sender_help;
 195         s->client_cmds[SENDER_ON] = http_com_on;
 196         s->client_cmds[SENDER_OFF] = http_com_off;
 197         s->client_cmds[SENDER_DENY] = http_com_deny;
 198         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 199         s->client_cmds[SENDER_ADD] = NULL;
 200         s->client_cmds[SENDER_DELETE] = NULL;
 201
 202         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 203                 conf.http_port_arg, conf.http_max_clients_arg,
 204                 conf.http_default_deny_given);
 205         if (conf.http_no_autostart_given)
 206                 return;
 207         ret = generic_com_on(hss, IPPROTO_TCP);
 208         if (ret < 0)
 209                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 210 }