http_recv.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file http_recv.c paraslash's http receiver */
  20
  21 #include "para.h"
  22
  23 #include "http.h"
  24 #include "recv.h"
  25 #include "http_recv.cmdline.h"
  26 #include "error.h"
  27 #include "net.h"
  28 #include "string.h"
  29
  30 /** the output buffer size of the http receiver */
  31 #define BUFSIZE (32 * 1024)
  32
  33 /**
  34  * the possible states of a http receiver node
  35  *
  36  * \sa receiver_node
  37  */
  38 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  39
  40 /**
  41  * data specific to the http receiver
  42  *
  43  * Each running instance of the http receiver reserves space for one such struct.
  44  */
  45 struct private_http_recv_data {
  46 /**
  47  *
  48  *
  49  * the current status of the http receiver node
  50  *
  51  * It gets initialized to #HTTP_CONNECTED by the open function of the
  52  * http receiver.
  53  *
  54  * \sa receiver::open, receiver_node.
  55  */
  56         enum http_recv_status status;
  57 /**
  58  *
  59  *
  60  * the file descriptor used for receiving the http stream
  61  *
  62  * The pre_select function of the http receiver adds this file descriptor to
  63  * the set of file decriptors which are checked for reading/writing (depending
  64  * on the current status) by the select loop of the application (para_audiod or
  65  * para_recv).
  66  *
  67  * The post_select function of the http receiver uses \a fd, if ready, to
  68  * establish the http connection, and updates \a status according to the new
  69  * state of the connection.  As soon as \a status is #HTTP_STREAMING, \a fd is
  70  * going to be only checked for reading. If data is available, it is read into
  71  * the output buffer of the receiver node by post_select.
  72  *
  73  * \sa receiver::pre_select receiver::post_select receiver_node
  74  */
  75         int fd;
  76 };
  77
  78 static void http_shutdown(void)
  79 {
  80         return;
  81 }
  82
  83 static char *make_request_msg(void)
  84 {
  85         char *ret, *hn = para_hostname();
  86         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  87                 HTTP_GET_MSG, hn, VERSION);
  88         free(hn);
  89         return ret;
  90 }
  91
  92 static int http_pre_select(struct receiver_node *rn, fd_set *rfds, fd_set *wfds,
  93         __a_unused struct timeval *timeout)
  94 {
  95         struct private_http_recv_data *phd = rn->private_data;
  96
  97         if  (phd->status == HTTP_CONNECTED)
  98                 FD_SET(phd->fd, wfds);
  99         else
 100                 FD_SET(phd->fd, rfds);
 101         return phd->fd;
 102 }
 103
 104 static int http_post_select(struct receiver_node *rn, int select_ret,
 105                 fd_set *rfds, fd_set *wfds)
 106 {
 107         int ret;
 108         struct private_http_recv_data *phd = rn->private_data;
 109
 110         if (!select_ret) /* we're not interested in timeouts */
 111                 return 1;
 112         if  (phd->status == HTTP_CONNECTED) {
 113                 char *rq;
 114                 if (!FD_ISSET(phd->fd, wfds))
 115                         return 1; /* nothing to do */
 116                 rq = make_request_msg();
 117                 PARA_NOTICE_LOG("%s", "sending http request\n");
 118                 ret = send_va_buffer(phd->fd, "%s", rq);
 119                 free(rq);
 120                 if (ret < 0)
 121                         return E_SEND_HTTP_REQUEST;
 122                 phd->status = HTTP_SENT_GET_REQUEST;
 123                 return 1;
 124         }
 125         if (!FD_ISSET(phd->fd, rfds))
 126                 return 1; /* nothing to do */
 127         if (phd->status == HTTP_SENT_GET_REQUEST) {
 128                 ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
 129                 if (ret < 0)
 130                         return -E_MISSING_OK;
 131                 PARA_NOTICE_LOG("%s", "received ok msg, streaming\n");
 132                 phd->status = HTTP_STREAMING;
 133                 return 1;
 134         }
 135         /* already streaming */
 136         if (rn->loaded >= BUFSIZE) {
 137                 PARA_ERROR_LOG("%s", "buffer overrun\n");
 138                 return -E_OVERRUN;
 139         }
 140         ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded, BUFSIZE - rn->loaded);
 141         if (ret <= 0) {
 142                 PARA_NOTICE_LOG("recv returned %d/%zd\n", ret, BUFSIZE - rn->loaded);
 143                 return ret < 0? -E_HTTP_RECV_BUF : 0;
 144         }
 145         rn->loaded += ret;
 146         return 1;
 147 }
 148
 149 static void http_recv_close(struct receiver_node *rn)
 150 {
 151         struct private_http_recv_data *phd = rn->private_data;
 152         close(phd->fd);
 153         free(rn->buf);
 154         free(rn->private_data);
 155 }
 156
 157 static void *http_recv_parse_config(int argc, char **argv)
 158 {
 159         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 160
 161         if (!http_recv_cmdline_parser(argc, argv, tmp))
 162                 return tmp;
 163         free(tmp);
 164         return NULL;
 165 }
 166
 167 static int http_recv_open(struct receiver_node *rn)
 168 {
 169         struct private_http_recv_data *phd;
 170         struct hostent *he;
 171         struct http_recv_args_info *conf = rn->conf;
 172         struct sockaddr_in their_addr;
 173         int ret;
 174
 175         rn->buf = para_calloc(BUFSIZE);
 176         rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
 177         phd = rn->private_data;
 178         ret = -E_HOST_INFO;
 179         if (!(he = get_host_info(conf->host_arg)))
 180                 goto err_out;
 181         /* get new socket */
 182         ret = -E_SOCKET;
 183         if ((phd->fd = get_socket()) < 0)
 184                 goto err_out;
 185         /* init their_addr */
 186         init_sockaddr(&their_addr, conf->port_arg, he);
 187         /* connect */
 188         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
 189                 conf->port_arg);
 190         ret = para_connect(phd->fd, &their_addr);
 191         if (ret < 0)
 192                 goto err_out;
 193         phd->status = HTTP_CONNECTED;
 194         return 1;
 195 err_out:
 196         free(rn->private_data);
 197         free(rn->buf);
 198         return ret;
 199 }
 200
 201 /**
 202  * the init function of the http receiver
 203  *
 204  * \param r pointer to the receiver struct to initialize
 205  *
 206  * Just initialize all function pointers of \a r.
 207  */
 208 void http_recv_init(struct receiver *r)
 209 {
 210         r->open = http_recv_open;
 211         r->close = http_recv_close;
 212         r->pre_select = http_pre_select;
 213         r->post_select = http_post_select;
 214         r->shutdown = http_shutdown;
 215         r->parse_config = http_recv_parse_config;
 216 }