http_recv.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file http_recv.c paraslash's http receiver */
   8
   9 #include "para.h"
  10
  11 #include "http.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "recv.h"
  15 #include "http_recv.cmdline.h"
  16 #include "error.h"
  17 #include "net.h"
  18 #include "string.h"
  19 #include "fd.h"
  20
  21 /** the output buffer size of the http receiver */
  22 #define BUFSIZE (32 * 1024)
  23
  24 /**
  25  * the possible states of a http receiver node
  26  *
  27  * \sa receiver_node
  28  */
  29 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  30
  31 /**
  32  * data specific to the http receiver
  33  *
  34  * Each running instance of the http receiver reserves space for one such struct.
  35  */
  36 struct private_http_recv_data {
  37 /**
  38  *
  39  *
  40  * the current status of the http receiver node
  41  *
  42  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  43  * http receiver.
  44  *
  45  * \sa receiver::open, receiver_node.
  46  */
  47         enum http_recv_status status;
  48 /**
  49  *
  50  *
  51  * the file descriptor used for receiving the http stream
  52  *
  53  * The pre_select function of the http receiver adds this file descriptor to
  54  * the set of file decriptors which are checked for reading/writing (depending
  55  * on the current status) by the select loop of the application (para_audiod or
  56  * para_recv).
  57  *
  58  * The post_select function of the http receiver uses \a fd, if ready, to
  59  * establish the http connection, and updates \a status according to the new
  60  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  61  * going to be only checked for reading. If data is available, it is read into
  62  * the output buffer of the receiver node by post_select.
  63  *
  64  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  65  */
  66         int fd;
  67 };
  68
  69 static void http_shutdown(void)
  70 {
  71         return;
  72 }
  73
  74 static char *make_request_msg(void)
  75 {
  76         char *ret, *hn = para_hostname();
  77         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  78                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  79         free(hn);
  80         return ret;
  81 }
  82
  83 static void http_recv_pre_select(struct sched *s, struct task *t)
  84 {
  85         struct receiver_node *rn = t->private_data;
  86         struct private_http_recv_data *phd = rn->private_data;
  87
  88         t->ret = 1;
  89         if  (phd->status == HTTP_CONNECTED)
  90                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  91         else
  92                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  93 }
  94
  95
  96 static void http_recv_post_select(struct sched *s, struct task *t)
  97 {
  98         struct receiver_node *rn = t->private_data;
  99         struct private_http_recv_data *phd = rn->private_data;
 100
 101         t->ret = -E_HTTP_RECV_EOF;
 102         if (rn->output_eof && *rn->output_eof)
 103                 goto out;
 104         t->ret = 1;
 105         if (!s->select_ret)
 106                 goto out;
 107         if  (phd->status == HTTP_CONNECTED) {
 108                 char *rq;
 109                 if (!FD_ISSET(phd->fd, &s->wfds))
 110                         goto out;
 111                 rq = make_request_msg();
 112                 PARA_INFO_LOG("%s", "sending http request\n");
 113                 t->ret = send_va_buffer(phd->fd, "%s", rq);
 114                 free(rq);
 115                 if (t->ret > 0)
 116                         phd->status = HTTP_SENT_GET_REQUEST;
 117                 goto out;
 118         }
 119         if (!FD_ISSET(phd->fd, &s->rfds))
 120                 goto out;
 121         if (phd->status == HTTP_SENT_GET_REQUEST) {
 122                 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
 123                 if (t->ret < 0)
 124                         goto out;
 125                 PARA_INFO_LOG("%s", "received ok msg, streaming\n");
 126                 t->ret = 1;
 127                 phd->status = HTTP_STREAMING;
 128                 goto out;
 129         }
 130         t->ret = -E_HTTP_RECV_OVERRUN;
 131         if (rn->loaded >= BUFSIZE)
 132                 goto out;
 133         t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 134                 BUFSIZE - rn->loaded);
 135         if (t->ret <= 0) {
 136                 if (!t->ret)
 137                         t->ret = -E_HTTP_RECV_EOF;
 138                 goto out;
 139         }
 140         rn->loaded += t->ret;
 141 out:
 142         if (t->ret < 0)
 143                 rn->eof = 1;
 144 }
 145
 146 static void http_recv_close(struct receiver_node *rn)
 147 {
 148         struct private_http_recv_data *phd = rn->private_data;
 149         close(phd->fd);
 150         free(rn->buf);
 151         free(rn->private_data);
 152 }
 153
 154 static void *http_recv_parse_config(int argc, char **argv)
 155 {
 156         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 157
 158         if (!http_recv_cmdline_parser(argc, argv, tmp))
 159                 return tmp;
 160         free(tmp);
 161         return NULL;
 162 }
 163
 164 static int http_recv_open(struct receiver_node *rn)
 165 {
 166         struct private_http_recv_data *phd;
 167         struct hostent *he;
 168         struct http_recv_args_info *conf = rn->conf;
 169         struct sockaddr_in their_addr;
 170         int ret;
 171
 172         rn->buf = para_calloc(BUFSIZE);
 173         rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
 174         phd = rn->private_data;
 175         ret = get_host_info(conf->host_arg, &he);
 176         if (ret < 0)
 177                 goto err_out;
 178         ret = get_stream_socket(AF_INET);
 179         if (ret < 0)
 180                 goto err_out;
 181         phd->fd = ret;
 182         /* init their_addr */
 183         init_sockaddr(&their_addr, conf->port_arg, he);
 184         /* connect */
 185         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
 186                 conf->port_arg);
 187         ret = para_connect(phd->fd, &their_addr);
 188         if (ret < 0) {
 189                 close(phd->fd);
 190                 goto err_out;
 191         }
 192         mark_fd_nonblock(phd->fd);
 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_recv_pre_select;
 213         r->post_select = http_recv_post_select;
 214         r->shutdown = http_shutdown;
 215         r->parse_config = http_recv_parse_config;
 216 }