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 "list.h"
  25 #include "sched.h"
  26 #include "recv.h"
  27 #include "http_recv.cmdline.h"
  28 #include "error.h"
  29 #include "net.h"
  30 #include "string.h"
  31 #include "fd.h"
  32
  33 /** the output buffer size of the http receiver */
  34 #define BUFSIZE (32 * 1024)
  35
  36 /**
  37  * the possible states of a http receiver node
  38  *
  39  * \sa receiver_node
  40  */
  41 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  42
  43 /**
  44  * data specific to the http receiver
  45  *
  46  * Each running instance of the http receiver reserves space for one such struct.
  47  */
  48 struct private_http_recv_data {
  49 /**
  50  *
  51  *
  52  * the current status of the http receiver node
  53  *
  54  * It gets initialized to #HTTP_CONNECTED by the open function of the
  55  * http receiver.
  56  *
  57  * \sa receiver::open, receiver_node.
  58  */
  59         enum http_recv_status status;
  60 /**
  61  *
  62  *
  63  * the file descriptor used for receiving the http stream
  64  *
  65  * The pre_select function of the http receiver adds this file descriptor to
  66  * the set of file decriptors which are checked for reading/writing (depending
  67  * on the current status) by the select loop of the application (para_audiod or
  68  * para_recv).
  69  *
  70  * The post_select function of the http receiver uses \a fd, if ready, to
  71  * establish the http connection, and updates \a status according to the new
  72  * state of the connection.  As soon as \a status is #HTTP_STREAMING, \a fd is
  73  * going to be only checked for reading. If data is available, it is read into
  74  * the output buffer of the receiver node by post_select.
  75  *
  76  * \sa receiver::pre_select receiver::post_select receiver_node
  77  */
  78         int fd;
  79 };
  80
  81 static void http_shutdown(void)
  82 {
  83         return;
  84 }
  85
  86 static char *make_request_msg(void)
  87 {
  88         char *ret, *hn = para_hostname();
  89         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  90                 HTTP_GET_MSG, hn, VERSION);
  91         free(hn);
  92         return ret;
  93 }
  94
  95 static void http_recv_pre_select(struct sched *s, struct task *t)
  96 {
  97         struct receiver_node *rn = t->private_data;
  98         struct private_http_recv_data *phd = rn->private_data;
  99
 100         t->ret = 1;
 101         if  (phd->status == HTTP_CONNECTED)
 102                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
 103         else
 104                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
 105 }
 106
 107
 108 static void http_recv_post_select(struct sched *s, struct task *t)
 109 {
 110         struct receiver_node *rn = t->private_data;
 111         struct private_http_recv_data *phd = rn->private_data;
 112
 113         t->ret = 1;
 114         if (!s->select_ret) /* we're not interested in timeouts */
 115                 return;
 116         if  (phd->status == HTTP_CONNECTED) {
 117                 char *rq;
 118                 if (!FD_ISSET(phd->fd, &s->wfds))
 119                         return; /* nothing to do */
 120                 rq = make_request_msg();
 121                 PARA_NOTICE_LOG("%s", "sending http request\n");
 122                 t->ret = send_va_buffer(phd->fd, "%s", rq);
 123                 free(rq);
 124                 if (t->ret > 0)
 125                         phd->status = HTTP_SENT_GET_REQUEST;
 126                 return;
 127         }
 128         if (!FD_ISSET(phd->fd, &s->rfds))
 129                 return; /* nothing to do */
 130         if (phd->status == HTTP_SENT_GET_REQUEST) {
 131                 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
 132                 if (t->ret < 0)
 133                         return;
 134                 PARA_NOTICE_LOG("%s", "received ok msg, streaming\n");
 135                 phd->status = HTTP_STREAMING;
 136                 return;
 137         }
 138         t->ret = -E_OVERRUN;
 139         /* already streaming */
 140         if (rn->loaded >= BUFSIZE)
 141                 return;
 142         t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 143                 BUFSIZE - rn->loaded);
 144         if (t->ret <= 0) {
 145                 rn->eof = 1;
 146                 if (!t->ret)
 147                         t->ret = -E_HTTP_RECV_EOF;
 148                 return;
 149         }
 150         rn->loaded += t->ret;
 151 }
 152
 153 static void http_recv_close(struct receiver_node *rn)
 154 {
 155         struct private_http_recv_data *phd = rn->private_data;
 156         close(phd->fd);
 157         free(rn->buf);
 158         free(rn->private_data);
 159 }
 160
 161 static void *http_recv_parse_config(int argc, char **argv)
 162 {
 163         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 164
 165         if (!http_recv_cmdline_parser(argc, argv, tmp))
 166                 return tmp;
 167         free(tmp);
 168         return NULL;
 169 }
 170
 171 static int http_recv_open(struct receiver_node *rn)
 172 {
 173         struct private_http_recv_data *phd;
 174         struct hostent *he;
 175         struct http_recv_args_info *conf = rn->conf;
 176         struct sockaddr_in their_addr;
 177         int ret;
 178
 179         rn->buf = para_calloc(BUFSIZE);
 180         rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
 181         phd = rn->private_data;
 182         ret = -E_HOST_INFO;
 183         if (!(he = get_host_info(conf->host_arg)))
 184                 goto err_out;
 185         /* get new socket */
 186         ret = -E_SOCKET;
 187         if ((phd->fd = get_socket()) < 0)
 188                 goto err_out;
 189         /* init their_addr */
 190         init_sockaddr(&their_addr, conf->port_arg, he);
 191         /* connect */
 192         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
 193                 conf->port_arg);
 194         ret = para_connect(phd->fd, &their_addr);
 195         if (ret < 0)
 196                 goto err_out;
 197         phd->status = HTTP_CONNECTED;
 198         return 1;
 199 err_out:
 200         free(rn->private_data);
 201         free(rn->buf);
 202         return ret;
 203 }
 204
 205 /**
 206  * the init function of the http receiver
 207  *
 208  * \param r pointer to the receiver struct to initialize
 209  *
 210  * Just initialize all function pointers of \a r.
 211  */
 212 void http_recv_init(struct receiver *r)
 213 {
 214         r->open = http_recv_open;
 215         r->close = http_recv_close;
 216         r->pre_select = http_recv_pre_select;
 217         r->post_select = http_recv_post_select;
 218         r->shutdown = http_shutdown;
 219         r->parse_config = http_recv_parse_config;
 220 }