http_send.c

   1 /*
   2  * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
   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 <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16
  17 #include "para.h"
  18 #include "error.h"
  19 #include "string.h"
  20 #include "server.cmdline.h"
  21 #include "afh.h"
  22 #include "server.h"
  23 #include "http.h"
  24 #include "list.h"
  25 #include "send.h"
  26 #include "sched.h"
  27 #include "vss.h"
  28 #include "close_on_fork.h"
  29 #include "net.h"
  30 #include "fd.h"
  31 #include "chunk_queue.h"
  32 #include "acl.h"
  33
  34 /** Message sent to clients that do not send a valid get request. */
  35 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  36
  37 /** The possible states of a client from the server's POV. */
  38 enum http_client_status {
  39         /** We accepted the connection on the tcp socket. */
  40         HTTP_CONNECTED,
  41         /** Successfully received the get request. */
  42         HTTP_GOT_GET_REQUEST,
  43         /** Connection is ready for sending audio data. */
  44         HTTP_STREAMING,
  45         /** We didn't receive a valid get request. */
  46         HTTP_INVALID_GET_REQUEST
  47 };
  48
  49 /** For each connected client, a structure of this type is maintained. */
  50 struct private_http_sender_data {
  51         /** The current state of this client. */
  52         enum http_client_status status;
  53 };
  54
  55 static struct sender_status http_sender_status, *hss = &http_sender_status;
  56
  57 static int http_send_msg(struct sender_client *sc, const char *msg)
  58 {
  59         int ret = write_buffer(sc->fd, msg);
  60
  61         if (ret < 0)
  62                 shutdown_client(sc, hss);
  63         return ret;
  64 }
  65
  66 static void http_send_ok_msg(struct sender_client *sc)
  67 {
  68         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  69         http_send_msg(sc, HTTP_OK_MSG);
  70 }
  71
  72 static int http_send_err_msg(struct sender_client *sc)
  73 {
  74         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  75         return http_send_msg(sc, HTTP_ERR_MSG);
  76 }
  77
  78 static void http_shutdown_clients(void)
  79 {
  80         shutdown_clients(hss);
  81 }
  82
  83 static int queue_chunk_or_shutdown(struct sender_client *sc,
  84                 struct sender_status *ss, const char *buf, size_t num_bytes)
  85 {
  86         int ret = cq_enqueue(sc->cq, buf, num_bytes);
  87         if (ret < 0)
  88                 shutdown_client(sc, ss);
  89         return ret;
  90 }
  91
  92 /**
  93  * Send one chunk of audio data to a connected client.
  94  *
  95  * \param sc The client.
  96  * \param ss The sender.
  97  * \param current_chunk The number of the chunk to write.
  98  * \param buf The data to write.
  99  * \param len The number of bytes of \a buf.
 100  * \param header_buf The audio file header.
 101  * \param header_len The number of bytes of \a header_buf.
 102  *
 103  * On errors, the client is shut down. If only a part of the buffer could be
 104  * written, the remainder is put into the chunk queue for that client.
 105  */
 106 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
 107                 long unsigned current_chunk, const char *buf, size_t len,
 108                 const char *header_buf, size_t header_len)
 109 {
 110         int ret;
 111
 112         if (!sc->header_sent && current_chunk) {
 113                 if (header_buf && header_len > 0) {
 114                         ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
 115                         if (ret < 0)
 116                                 goto out;
 117                 }
 118         }
 119         sc->header_sent = 1;
 120         ret = send_queued_chunks(sc->fd, sc->cq);
 121         if (ret < 0) {
 122                 shutdown_client(sc, ss);
 123                 goto out;
 124         }
 125         if (!len)
 126                 goto out;
 127         if (!ret) { /* still data left in the queue */
 128                 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
 129                 goto out;
 130         }
 131         ret = xwrite(sc->fd, buf, len);
 132         if (ret < 0) {
 133                 shutdown_client(sc, ss);
 134                 goto out;
 135         }
 136         if (ret != len)
 137                 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
 138 out:
 139         if (ret < 0)
 140                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 141 }
 142
 143 static void http_send(long unsigned current_chunk,
 144         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
 145         const char *header_buf, size_t header_len)
 146 {
 147         struct sender_client *sc, *tmp;
 148
 149         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 150                 struct private_http_sender_data *phsd = sc->private_data;
 151
 152                 if (phsd->status == HTTP_STREAMING)
 153                         http_send_chunk(sc, hss, current_chunk, buf, len,
 154                                    header_buf, header_len);
 155         }
 156 }
 157
 158 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 159 {
 160         struct sender_client *sc, *tmp;
 161         struct private_http_sender_data *phsd;
 162         int ret;
 163
 164         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 165                 phsd = sc->private_data;
 166                 switch (phsd->status) {
 167                 case HTTP_STREAMING: /* nothing to do */
 168                         break;
 169                 case HTTP_CONNECTED: /* need to recv get request */
 170                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 171                         if (ret < 0)
 172                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 173                         else if (ret > 0) {
 174                                 phsd->status = HTTP_GOT_GET_REQUEST;
 175                                 PARA_INFO_LOG("received get request\n");
 176                         }
 177                         break;
 178                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 179                         phsd->status = HTTP_STREAMING;
 180                         http_send_ok_msg(sc);
 181                         break;
 182                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 183                         if (http_send_err_msg(sc) >= 0)
 184                                 shutdown_client(sc, hss);
 185                         break;
 186                 }
 187         }
 188         sc = accept_sender_client(hss, rfds);
 189         if (!sc)
 190                 return;
 191         phsd = para_malloc(sizeof(*phsd));
 192         sc->private_data = phsd;
 193         phsd->status = HTTP_CONNECTED;
 194 }
 195
 196 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 197 {
 198         struct sender_client *sc, *tmp;
 199
 200         if (hss->listen_fd < 0)
 201                 return;
 202         para_fd_set(hss->listen_fd, rfds, max_fileno);
 203         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 204                 struct private_http_sender_data *phsd = sc->private_data;
 205                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 206                         para_fd_set(sc->fd, rfds, max_fileno);
 207                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 208                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 209                         para_fd_set(sc->fd, wfds, max_fileno);
 210         }
 211 }
 212
 213 static int http_com_on(__a_unused struct sender_command_data *scd)
 214 {
 215         return generic_com_on(hss, IPPROTO_TCP);
 216 }
 217
 218 static int http_com_off(__a_unused struct sender_command_data *scd)
 219 {
 220         generic_com_off(hss);
 221         return 1;
 222 }
 223
 224 static int http_com_deny(struct sender_command_data *scd)
 225 {
 226         generic_com_deny(scd, hss);
 227         return 1;
 228 }
 229
 230 static int http_com_allow(struct sender_command_data *scd)
 231 {
 232         generic_com_allow(scd, hss);
 233         return 1;
 234 }
 235
 236 static char *http_status(void)
 237 {
 238         return generic_sender_status(hss, "http");
 239 }
 240
 241 /**
 242  * The init function of the http sender.
 243  *
 244  * \param s Pointer to the http sender struct.
 245  *
 246  * It initializes all function pointers of \a s, the client list and the access
 247  * control list. If the autostart option was given, the tcp port is opened.
 248  */
 249 void http_send_init(struct sender *s)
 250 {
 251         int ret;
 252         s->status = http_status;
 253         s->send = http_send;
 254         s->pre_select = http_pre_select;
 255         s->post_select = http_post_select;
 256         s->shutdown_clients = http_shutdown_clients;
 257         s->resolve_target = NULL;
 258         s->help = generic_sender_help;
 259         s->client_cmds[SENDER_ON] = http_com_on;
 260         s->client_cmds[SENDER_OFF] = http_com_off;
 261         s->client_cmds[SENDER_DENY] = http_com_deny;
 262         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 263         s->client_cmds[SENDER_ADD] = NULL;
 264         s->client_cmds[SENDER_DELETE] = NULL;
 265
 266         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 267                 conf.http_port_arg, conf.http_max_clients_arg,
 268                 conf.http_default_deny_given);
 269         if (conf.http_no_autostart_given)
 270                 return;
 271         ret = generic_com_on(hss, IPPROTO_TCP);
 272         if (ret < 0)
 273                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 274 }