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 #include "error.h"
  11 #include "http.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "recv.h"
  15 #include "http_recv.cmdline.h"
  16 #include "net.h"
  17 #include "string.h"
  18 #include "fd.h"
  19
  20 /** the output buffer size of the http receiver */
  21 #define BUFSIZE (32 * 1024)
  22
  23 /**
  24  * the possible states of a http receiver node
  25  *
  26  * \sa receiver_node
  27  */
  28 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  29
  30 /**
  31  * data specific to the http receiver
  32  *
  33  * Each running instance of the http receiver reserves space for one such struct.
  34  */
  35 struct private_http_recv_data {
  36 /**
  37  *
  38  *
  39  * the current status of the http receiver node
  40  *
  41  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  42  * http receiver.
  43  *
  44  * \sa receiver::open, receiver_node.
  45  */
  46         enum http_recv_status status;
  47 /**
  48  *
  49  *
  50  * the file descriptor used for receiving the http stream
  51  *
  52  * The pre_select function of the http receiver adds this file descriptor to
  53  * the set of file decriptors which are checked for reading/writing (depending
  54  * on the current status) by the select loop of the application (para_audiod or
  55  * para_recv).
  56  *
  57  * The post_select function of the http receiver uses \a fd, if ready, to
  58  * establish the http connection, and updates \a status according to the new
  59  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  60  * going to be only checked for reading. If data is available, it is read into
  61  * the output buffer of the receiver node by post_select.
  62  *
  63  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  64  */
  65         int fd;
  66 };
  67
  68 static void http_shutdown(void)
  69 {
  70         return;
  71 }
  72
  73 static char *make_request_msg(void)
  74 {
  75         char *ret, *hn = para_hostname();
  76         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  77                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  78         free(hn);
  79         return ret;
  80 }
  81
  82 static void http_recv_pre_select(struct sched *s, struct task *t)
  83 {
  84         struct receiver_node *rn = t->private_data;
  85         struct private_http_recv_data *phd = rn->private_data;
  86
  87         t->ret = 1;
  88         if  (phd->status == HTTP_CONNECTED)
  89                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  90         else
  91                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  92 }
  93
  94
  95 static void http_recv_post_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 = -E_HTTP_RECV_EOF;
 101         if (rn->output_eof && *rn->output_eof)
 102                 goto out;
 103         t->ret = 1;
 104         if (!s->select_ret)
 105                 goto out;
 106         if  (phd->status == HTTP_CONNECTED) {
 107                 char *rq;
 108                 if (!FD_ISSET(phd->fd, &s->wfds))
 109                         goto out;
 110                 rq = make_request_msg();
 111                 PARA_INFO_LOG("%s", "sending http request\n");
 112                 t->ret = send_va_buffer(phd->fd, "%s", rq);
 113                 free(rq);
 114                 if (t->ret > 0)
 115                         phd->status = HTTP_SENT_GET_REQUEST;
 116                 goto out;
 117         }
 118         if (!FD_ISSET(phd->fd, &s->rfds))
 119                 goto out;
 120         if (phd->status == HTTP_SENT_GET_REQUEST) {
 121                 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
 122                 if (t->ret < 0)
 123                         goto out;
 124                 PARA_INFO_LOG("%s", "received ok msg, streaming\n");
 125                 t->ret = 1;
 126                 phd->status = HTTP_STREAMING;
 127                 goto out;
 128         }
 129         t->ret = -E_HTTP_RECV_OVERRUN;
 130         if (rn->loaded >= BUFSIZE)
 131                 goto out;
 132         t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 133                 BUFSIZE - rn->loaded);
 134         if (t->ret <= 0) {
 135                 if (!t->ret)
 136                         t->ret = -E_HTTP_RECV_EOF;
 137                 goto out;
 138         }
 139         rn->loaded += t->ret;
 140 out:
 141         if (t->ret < 0)
 142                 rn->eof = 1;
 143 }
 144
 145 static void http_recv_close(struct receiver_node *rn)
 146 {
 147         struct private_http_recv_data *phd = rn->private_data;
 148         close(phd->fd);
 149         free(rn->buf);
 150         free(rn->private_data);
 151 }
 152
 153 static void *http_recv_parse_config(int argc, char **argv)
 154 {
 155         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 156
 157         if (!http_recv_cmdline_parser(argc, argv, tmp))
 158                 return tmp;
 159         free(tmp);
 160         return NULL;
 161 }
 162
 163 static int http_recv_open(struct receiver_node *rn)
 164 {
 165         struct private_http_recv_data *phd;
 166         struct hostent *he;
 167         struct http_recv_args_info *conf = rn->conf;
 168         struct sockaddr_in their_addr;
 169         int ret;
 170
 171         rn->buf = para_calloc(BUFSIZE);
 172         rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
 173         phd = rn->private_data;
 174         ret = get_host_info(conf->host_arg, &he);
 175         if (ret < 0)
 176                 goto err_out;
 177         ret = get_stream_socket(AF_INET);
 178         if (ret < 0)
 179                 goto err_out;
 180         phd->fd = ret;
 181         /* init their_addr */
 182         init_sockaddr(&their_addr, conf->port_arg, he);
 183         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
 184                 conf->port_arg);
 185         ret = PARA_CONNECT(phd->fd, &their_addr);
 186         if (ret < 0) {
 187                 close(phd->fd);
 188                 goto err_out;
 189         }
 190         mark_fd_nonblock(phd->fd);
 191         phd->status = HTTP_CONNECTED;
 192         return 1;
 193 err_out:
 194         free(rn->private_data);
 195         free(rn->buf);
 196         return ret;
 197 }
 198
 199 /**
 200  * the init function of the http receiver
 201  *
 202  * \param r pointer to the receiver struct to initialize
 203  *
 204  * Just initialize all function pointers of \a r.
 205  */
 206 void http_recv_init(struct receiver *r)
 207 {
 208         r->open = http_recv_open;
 209         r->close = http_recv_close;
 210         r->pre_select = http_recv_pre_select;
 211         r->post_select = http_recv_post_select;
 212         r->shutdown = http_shutdown;
 213         r->parse_config = http_recv_parse_config;
 214 }