http_send.c

   1 /*
   2  * Copyright (C) 2005-2011 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 #include <stdbool.h>
  14
  15 #include "para.h"
  16 #include "error.h"
  17 #include "string.h"
  18 #include "server.cmdline.h"
  19 #include "afh.h"
  20 #include "afs.h"
  21 #include "server.h"
  22 #include "http.h"
  23 #include "list.h"
  24 #include "send.h"
  25 #include "vss.h"
  26 #include "close_on_fork.h"
  27 #include "net.h"
  28 #include "fd.h"
  29 #include "chunk_queue.h"
  30 #include "acl.h"
  31
  32 /** Message sent to clients that do not send a valid get request. */
  33 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  34
  35 /** The possible states of a client from the server's POV. */
  36 enum http_client_status {
  37         /** We accepted the connection on the tcp socket. */
  38         HTTP_CONNECTED,
  39         /** Successfully received the get request. */
  40         HTTP_GOT_GET_REQUEST,
  41         /** Connection is ready for sending audio data. */
  42         HTTP_STREAMING,
  43         /** We didn't receive a valid get request. */
  44         HTTP_INVALID_GET_REQUEST
  45 };
  46
  47 /** For each connected client, a structure of this type is maintained. */
  48 struct private_http_sender_data {
  49         /** The current state of this client. */
  50         enum http_client_status status;
  51 };
  52
  53 static struct sender_status http_sender_status, *hss = &http_sender_status;
  54
  55 static int http_send_msg(struct sender_client *sc, const char *msg)
  56 {
  57         int ret = send_buffer(sc->fd, msg);
  58
  59         if (ret < 0)
  60                 shutdown_client(sc, hss);
  61         return ret;
  62 }
  63
  64 static void http_send_ok_msg(struct sender_client *sc)
  65 {
  66         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  67         http_send_msg(sc, HTTP_OK_MSG);
  68 }
  69
  70 static int http_send_err_msg(struct sender_client *sc)
  71 {
  72         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  73         return http_send_msg(sc, HTTP_ERR_MSG);
  74 }
  75
  76 static void http_shutdown_clients(void)
  77 {
  78         shutdown_clients(hss);
  79 }
  80
  81 static int queue_chunk_or_shutdown(struct sender_client *sc,
  82                 struct sender_status *ss, const char *buf, size_t num_bytes)
  83 {
  84         int ret = cq_enqueue(sc->cq, buf, num_bytes);
  85         if (ret < 0)
  86                 shutdown_client(sc, ss);
  87         return ret;
  88 }
  89
  90 /**
  91  * Send one chunk of audio data to a connected client.
  92  *
  93  * \param sc The client.
  94  * \param ss The sender.
  95  * \param current_chunk The number of the chunk to write.
  96  * \param buf The data to write.
  97  * \param len The number of bytes of \a buf.
  98  * \param header_buf The audio file header.
  99  * \param header_len The number of bytes of \a header_buf.
 100  *
 101  * On errors, the client is shut down. If only a part of the buffer could be
 102  * written, the remainder is put into the chunk queue for that client.
 103  */
 104 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
 105                 long unsigned current_chunk, const char *buf, size_t len,
 106                 const char *header_buf, size_t header_len)
 107 {
 108         int ret;
 109
 110         if (!sc->header_sent && current_chunk) {
 111                 if (header_buf && header_len > 0) {
 112                         ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
 113                         if (ret < 0)
 114                                 goto out;
 115                 }
 116         }
 117         sc->header_sent = 1;
 118         ret = send_queued_chunks(sc->fd, sc->cq);
 119         if (ret < 0) {
 120                 shutdown_client(sc, ss);
 121                 goto out;
 122         }
 123         if (!len)
 124                 goto out;
 125         if (!ret) { /* still data left in the queue */
 126                 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
 127                 goto out;
 128         }
 129         ret = write_nonblock(sc->fd, buf, len);
 130         if (ret < 0) {
 131                 shutdown_client(sc, ss);
 132                 goto out;
 133         }
 134         if (ret != len)
 135                 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
 136 out:
 137         if (ret < 0)
 138                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 139 }
 140
 141 static void http_send(long unsigned current_chunk,
 142         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
 143         const char *header_buf, size_t header_len)
 144 {
 145         struct sender_client *sc, *tmp;
 146
 147         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 148                 struct private_http_sender_data *phsd = sc->private_data;
 149
 150                 if (phsd->status == HTTP_STREAMING)
 151                         http_send_chunk(sc, hss, current_chunk, buf, len,
 152                                    header_buf, header_len);
 153         }
 154 }
 155
 156 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 157 {
 158         struct sender_client *sc, *tmp;
 159         struct private_http_sender_data *phsd;
 160         int ret;
 161
 162         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 163                 phsd = sc->private_data;
 164                 switch (phsd->status) {
 165                 case HTTP_STREAMING: /* nothing to do */
 166                         break;
 167                 case HTTP_CONNECTED: /* need to recv get request */
 168                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 169                         if (ret < 0)
 170                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 171                         else if (ret > 0) {
 172                                 phsd->status = HTTP_GOT_GET_REQUEST;
 173                                 PARA_INFO_LOG("received get request\n");
 174                         }
 175                         break;
 176                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 177                         phsd->status = HTTP_STREAMING;
 178                         http_send_ok_msg(sc);
 179                         break;
 180                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 181                         if (http_send_err_msg(sc) >= 0)
 182                                 shutdown_client(sc, hss);
 183                         break;
 184                 }
 185         }
 186         sc = accept_sender_client(hss, rfds);
 187         if (!sc)
 188                 return;
 189         phsd = para_malloc(sizeof(*phsd));
 190         sc->private_data = phsd;
 191         phsd->status = HTTP_CONNECTED;
 192 }
 193
 194 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 195 {
 196         struct sender_client *sc, *tmp;
 197
 198         if (hss->listen_fd < 0)
 199                 return;
 200         para_fd_set(hss->listen_fd, rfds, max_fileno);
 201         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 202                 struct private_http_sender_data *phsd = sc->private_data;
 203                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 204                         para_fd_set(sc->fd, rfds, max_fileno);
 205                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 206                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 207                         para_fd_set(sc->fd, wfds, max_fileno);
 208         }
 209 }
 210
 211 static int http_com_on(__a_unused struct sender_command_data *scd)
 212 {
 213         return generic_com_on(hss, IPPROTO_TCP);
 214 }
 215
 216 static int http_com_off(__a_unused struct sender_command_data *scd)
 217 {
 218         generic_com_off(hss);
 219         return 1;
 220 }
 221
 222 static int http_com_deny(struct sender_command_data *scd)
 223 {
 224         generic_com_deny(scd, hss);
 225         return 1;
 226 }
 227
 228 static int http_com_allow(struct sender_command_data *scd)
 229 {
 230         generic_com_allow(scd, hss);
 231         return 1;
 232 }
 233
 234 static char *http_info(void)
 235 {
 236         return get_sender_info(hss, "http");
 237 }
 238
 239 /**
 240  * The init function of the http sender.
 241  *
 242  * \param s Pointer to the http sender struct.
 243  *
 244  * It initializes all function pointers of \a s, the client list and the access
 245  * control list. If the autostart option was given, the tcp port is opened.
 246  */
 247 void http_send_init(struct sender *s)
 248 {
 249         int ret;
 250         s->info = http_info;
 251         s->send = http_send;
 252         s->pre_select = http_pre_select;
 253         s->post_select = http_post_select;
 254         s->shutdown_clients = http_shutdown_clients;
 255         s->resolve_target = NULL;
 256         s->help = generic_sender_help;
 257         s->client_cmds[SENDER_ON] = http_com_on;
 258         s->client_cmds[SENDER_OFF] = http_com_off;
 259         s->client_cmds[SENDER_DENY] = http_com_deny;
 260         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 261         s->client_cmds[SENDER_ADD] = NULL;
 262         s->client_cmds[SENDER_DELETE] = NULL;
 263
 264         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 265                 conf.http_port_arg, conf.http_max_clients_arg,
 266                 conf.http_default_deny_given);
 267         if (conf.http_no_autostart_given)
 268                 return;
 269         ret = generic_com_on(hss, IPPROTO_TCP);
 270         if (ret < 0)
 271                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 272 }