http_send.c

   1 /*
   2  * Copyright (C) 2005-2013 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 <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 "list.h"
  22 #include "send.h"
  23 #include "sched.h"
  24 #include "vss.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 = write_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 int queue_chunk_or_shutdown(struct sender_client *sc,
  81                 struct sender_status *ss, const char *buf, size_t num_bytes)
  82 {
  83         int ret = cq_enqueue(sc->cq, buf, num_bytes);
  84         if (ret < 0)
  85                 shutdown_client(sc, ss);
  86         return ret;
  87 }
  88
  89 /**
  90  * Send one chunk of audio data to a connected client.
  91  *
  92  * \param sc The client.
  93  * \param ss The sender.
  94  * \param current_chunk The number of the chunk to write.
  95  * \param buf The data to write.
  96  * \param len The number of bytes of \a buf.
  97  * \param header_buf The audio file header.
  98  * \param header_len The number of bytes of \a header_buf.
  99  *
 100  * On errors, the client is shut down. If only a part of the buffer could be
 101  * written, the remainder is put into the chunk queue for that client.
 102  */
 103 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
 104                 long unsigned current_chunk, const char *buf, size_t len,
 105                 const char *header_buf, size_t header_len)
 106 {
 107         int ret;
 108
 109         if (!sc->header_sent && current_chunk) {
 110                 if (header_buf && header_len > 0) {
 111                         ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
 112                         if (ret < 0)
 113                                 goto out;
 114                 }
 115         }
 116         sc->header_sent = 1;
 117         ret = send_queued_chunks(sc->fd, sc->cq);
 118         if (ret < 0) {
 119                 shutdown_client(sc, ss);
 120                 goto out;
 121         }
 122         if (!len)
 123                 goto out;
 124         if (!ret) { /* still data left in the queue */
 125                 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
 126                 goto out;
 127         }
 128         ret = xwrite(sc->fd, buf, len);
 129         if (ret < 0) {
 130                 shutdown_client(sc, ss);
 131                 goto out;
 132         }
 133         if (ret != len)
 134                 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
 135 out:
 136         if (ret < 0)
 137                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 138 }
 139
 140 static void http_send(long unsigned current_chunk,
 141         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
 142         const char *header_buf, size_t header_len)
 143 {
 144         struct sender_client *sc, *tmp;
 145
 146         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 147                 struct private_http_sender_data *phsd = sc->private_data;
 148
 149                 if (phsd->status == HTTP_STREAMING)
 150                         http_send_chunk(sc, hss, current_chunk, buf, len,
 151                                    header_buf, header_len);
 152         }
 153 }
 154
 155 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 156 {
 157         struct sender_client *sc, *tmp;
 158         struct private_http_sender_data *phsd;
 159         int ret;
 160
 161         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 162                 phsd = sc->private_data;
 163                 switch (phsd->status) {
 164                 case HTTP_STREAMING: /* nothing to do */
 165                         break;
 166                 case HTTP_CONNECTED: /* need to recv get request */
 167                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 168                         if (ret < 0)
 169                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 170                         else if (ret > 0) {
 171                                 phsd->status = HTTP_GOT_GET_REQUEST;
 172                                 PARA_INFO_LOG("received get request\n");
 173                         }
 174                         break;
 175                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 176                         phsd->status = HTTP_STREAMING;
 177                         http_send_ok_msg(sc);
 178                         break;
 179                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 180                         if (http_send_err_msg(sc) >= 0)
 181                                 shutdown_client(sc, hss);
 182                         break;
 183                 }
 184         }
 185         sc = accept_sender_client(hss, rfds);
 186         if (!sc)
 187                 return;
 188         phsd = para_malloc(sizeof(*phsd));
 189         sc->private_data = phsd;
 190         phsd->status = HTTP_CONNECTED;
 191 }
 192
 193 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 194 {
 195         struct sender_client *sc, *tmp;
 196
 197         if (hss->listen_fd < 0)
 198                 return;
 199         para_fd_set(hss->listen_fd, rfds, max_fileno);
 200         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 201                 struct private_http_sender_data *phsd = sc->private_data;
 202                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 203                         para_fd_set(sc->fd, rfds, max_fileno);
 204                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 205                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 206                         para_fd_set(sc->fd, wfds, max_fileno);
 207         }
 208 }
 209
 210 static int http_com_on(__a_unused struct sender_command_data *scd)
 211 {
 212         return generic_com_on(hss, IPPROTO_TCP);
 213 }
 214
 215 static int http_com_off(__a_unused struct sender_command_data *scd)
 216 {
 217         generic_com_off(hss);
 218         return 1;
 219 }
 220
 221 static int http_com_deny(struct sender_command_data *scd)
 222 {
 223         generic_com_deny(scd, hss);
 224         return 1;
 225 }
 226
 227 static int http_com_allow(struct sender_command_data *scd)
 228 {
 229         generic_com_allow(scd, hss);
 230         return 1;
 231 }
 232
 233 static char *http_info(void)
 234 {
 235         return get_sender_info(hss, "http");
 236 }
 237
 238 /**
 239  * The init function of the http sender.
 240  *
 241  * \param s Pointer to the http sender struct.
 242  *
 243  * It initializes all function pointers of \a s, the client list and the access
 244  * control list. If the autostart option was given, the tcp port is opened.
 245  */
 246 void http_send_init(struct sender *s)
 247 {
 248         int ret;
 249         s->info = http_info;
 250         s->send = http_send;
 251         s->pre_select = http_pre_select;
 252         s->post_select = http_post_select;
 253         s->shutdown_clients = http_shutdown_clients;
 254         s->resolve_target = NULL;
 255         s->help = generic_sender_help;
 256         s->client_cmds[SENDER_ON] = http_com_on;
 257         s->client_cmds[SENDER_OFF] = http_com_off;
 258         s->client_cmds[SENDER_DENY] = http_com_deny;
 259         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 260         s->client_cmds[SENDER_ADD] = NULL;
 261         s->client_cmds[SENDER_DELETE] = NULL;
 262
 263         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 264                 conf.http_port_arg, conf.http_max_clients_arg,
 265                 conf.http_default_deny_given);
 266         if (conf.http_no_autostart_given)
 267                 return;
 268         ret = generic_com_on(hss, IPPROTO_TCP);
 269         if (ret < 0)
 270                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 271 }