http_send.c

   1 /*
   2  * Copyright (C) 2005-2008 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
  12 #include "para.h"
  13 #include "error.h"
  14 #include "string.h"
  15 #include "server.cmdline.h"
  16 #include "afh.h"
  17 #include "afs.h"
  18 #include "server.h"
  19 #include "http.h"
  20 #include "vss.h"
  21 #include "list.h"
  22 #include "send.h"
  23 #include "close_on_fork.h"
  24 #include "net.h"
  25 #include "fd.h"
  26 #include "chunk_queue.h"
  27 #include "acl.h"
  28
  29 /** Message sent to clients that do not send a valid get request. */
  30 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  31
  32 /** The possible states of a client from the server's POV. */
  33 enum http_client_status {
  34         /** We accepted the connection on the tcp socket. */
  35         HTTP_CONNECTED,
  36         /** Successfully received the get request. */
  37         HTTP_GOT_GET_REQUEST,
  38         /** Connection is ready for sending audio data. */
  39         HTTP_STREAMING,
  40         /** We didn't receive a valid get request. */
  41         HTTP_INVALID_GET_REQUEST
  42 };
  43
  44 struct private_http_sender_data {
  45         enum http_client_status status;
  46 };
  47
  48 static struct sender_status http_sender_status, *hss = &http_sender_status;
  49
  50 static int http_send_msg(struct sender_client *sc, const char *msg)
  51 {
  52         int ret = send_buffer(sc->fd, msg);
  53
  54         if (ret < 0)
  55                 shutdown_client(sc, hss);
  56         return ret;
  57 }
  58
  59 static void http_send_ok_msg(struct sender_client *sc)
  60 {
  61         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  62         http_send_msg(sc, HTTP_OK_MSG);
  63 }
  64
  65 static int http_send_err_msg(struct sender_client *sc)
  66 {
  67         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  68         return http_send_msg(sc, HTTP_ERR_MSG);
  69 }
  70
  71 static void http_shutdown_clients(void)
  72 {
  73         shutdown_clients(hss);
  74 }
  75
  76 static void http_send(long unsigned current_chunk,
  77         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
  78 {
  79         struct sender_client *sc, *tmp;
  80
  81         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  82                 struct private_http_sender_data *phsd = sc->private_data;
  83                 if (phsd->status != HTTP_STREAMING)
  84                         continue;
  85                 send_chunk(sc, hss, 0, current_chunk, buf, len);
  86         }
  87 }
  88
  89 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  90 {
  91         struct sender_client *sc, *tmp;
  92         struct private_http_sender_data *phsd;
  93
  94         if (hss->listen_fd < 0)
  95                 return;
  96         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  97                 phsd = sc->private_data;
  98                 switch (phsd->status) {
  99                 case HTTP_STREAMING: /* nothing to do */
 100                         break;
 101                 case HTTP_CONNECTED: /* need to recv get request */
 102                         if (FD_ISSET(sc->fd, rfds)) {
 103                                 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
 104                                                 < 0) {
 105                                         phsd->status = HTTP_INVALID_GET_REQUEST;
 106                                 } else {
 107                                         phsd->status = HTTP_GOT_GET_REQUEST;
 108                                         PARA_INFO_LOG("received get request\n");
 109                                 }
 110                         }
 111                         break;
 112                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 113                         phsd->status = HTTP_STREAMING;
 114                         http_send_ok_msg(sc);
 115                         break;
 116                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 117                         if (http_send_err_msg(sc) >= 0)
 118                                 shutdown_client(sc, hss);
 119                         break;
 120                 }
 121         }
 122         if (!FD_ISSET(hss->listen_fd, rfds))
 123                 return;
 124         sc = accept_sender_client(hss);
 125         if (!sc)
 126                 return;
 127         phsd = para_malloc(sizeof(*phsd));
 128         sc->private_data = phsd;
 129         phsd->status = HTTP_CONNECTED;
 130 }
 131
 132 static void http_pre_select(int *max_fileno, fd_set *rfds, __a_unused fd_set *wfds)
 133 {
 134         struct sender_client *sc, *tmp;
 135
 136         if (hss->listen_fd < 0)
 137                 return;
 138         para_fd_set(hss->listen_fd, rfds, max_fileno);
 139         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 140                 struct private_http_sender_data *phsd = sc->private_data;
 141                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 142                         para_fd_set(sc->fd, rfds, max_fileno);
 143         }
 144 }
 145
 146 static int http_com_on(__a_unused struct sender_command_data *scd)
 147 {
 148         return generic_com_on(hss, IPPROTO_TCP);
 149 }
 150
 151 static int http_com_off(__a_unused struct sender_command_data *scd)
 152 {
 153         generic_com_off(hss);
 154         return 1;
 155 }
 156
 157 static int http_com_deny(struct sender_command_data *scd)
 158 {
 159         generic_com_deny(scd, hss);
 160         return 1;
 161 }
 162
 163 static int http_com_allow(struct sender_command_data *scd)
 164 {
 165         generic_com_allow(scd, hss);
 166         return 1;
 167 }
 168
 169 static char *http_info(void)
 170 {
 171         return get_sender_info(hss, "http");
 172 }
 173
 174 /**
 175  * The init function of the http sender.
 176  *
 177  * \param s Pointer to the http sender struct.
 178  *
 179  * It initializes all function pointers of \a s, the client list and the access
 180  * control list. If the autostart option was given, the tcp port is opened.
 181  */
 182 void http_send_init(struct sender *s)
 183 {
 184         int ret;
 185         s->info = http_info;
 186         s->send = http_send;
 187         s->pre_select = http_pre_select;
 188         s->post_select = http_post_select;
 189         s->shutdown_clients = http_shutdown_clients;
 190         s->help = generic_sender_help;
 191         s->client_cmds[SENDER_ON] = http_com_on;
 192         s->client_cmds[SENDER_OFF] = http_com_off;
 193         s->client_cmds[SENDER_DENY] = http_com_deny;
 194         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 195         s->client_cmds[SENDER_ADD] = NULL;
 196         s->client_cmds[SENDER_DELETE] = NULL;
 197
 198         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 199                 conf.http_port_arg, conf.http_max_clients_arg,
 200                 conf.http_default_deny_given);
 201         if (conf.http_no_autostart_given)
 202                 return;
 203         ret = generic_com_on(hss, IPPROTO_TCP);
 204         if (ret < 0)
 205                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 206 }