http_recv.c

   1 /*
   2  * Copyright (C) 2005-2009 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 <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "http.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "recv.h"
  19 #include "http_recv.cmdline.h"
  20 #include "net.h"
  21 #include "string.h"
  22 #include "fd.h"
  23
  24 /** the output buffer size of the http receiver */
  25 #define BUFSIZE (32 * 1024)
  26
  27 /**
  28  * the possible states of a http receiver node
  29  *
  30  * \sa receiver_node
  31  */
  32 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  33
  34 /**
  35  * data specific to the http receiver
  36  *
  37  * Each running instance of the http receiver reserves space for one such struct.
  38  */
  39 struct private_http_recv_data {
  40 /**
  41  *
  42  *
  43  * the current status of the http receiver node
  44  *
  45  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  46  * http receiver.
  47  *
  48  * \sa receiver::open, receiver_node.
  49  */
  50         enum http_recv_status status;
  51 /**
  52  *
  53  *
  54  * the file descriptor used for receiving the http stream
  55  *
  56  * The pre_select function of the http receiver adds this file descriptor to
  57  * the set of file decriptors which are checked for reading/writing (depending
  58  * on the current status) by the select loop of the application (para_audiod or
  59  * para_recv).
  60  *
  61  * The post_select function of the http receiver uses \a fd, if ready, to
  62  * establish the http connection, and updates \a status according to the new
  63  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  64  * going to be only checked for reading. If data is available, it is read into
  65  * the output buffer of the receiver node by post_select.
  66  *
  67  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  68  */
  69         int fd;
  70 };
  71
  72 static void http_shutdown(void)
  73 {
  74         return;
  75 }
  76
  77 static char *make_request_msg(void)
  78 {
  79         char *ret, *hn = para_hostname();
  80         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  81                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  82         free(hn);
  83         return ret;
  84 }
  85
  86 static void http_recv_pre_select(struct sched *s, struct task *t)
  87 {
  88         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  89         struct private_http_recv_data *phd = rn->private_data;
  90
  91         t->error = 0;
  92         if  (phd->status == HTTP_CONNECTED)
  93                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  94         else
  95                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  96 }
  97
  98
  99 static void http_recv_post_select(struct sched *s, struct task *t)
 100 {
 101         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 102         struct private_http_recv_data *phd = rn->private_data;
 103
 104         if (rn->output_error && *rn->output_error < 0) {
 105                 t->error = *rn->output_error;
 106                 return;
 107         }
 108         if  (phd->status == HTTP_CONNECTED) {
 109                 char *rq;
 110                 if (!FD_ISSET(phd->fd, &s->wfds))
 111                         return;
 112                 rq = make_request_msg();
 113                 PARA_INFO_LOG("sending http request\n");
 114                 t->error = send_va_buffer(phd->fd, "%s", rq);
 115                 free(rq);
 116                 if (t->error >= 0)
 117                         phd->status = HTTP_SENT_GET_REQUEST;
 118                 return;
 119         }
 120         if (!FD_ISSET(phd->fd, &s->rfds))
 121                 return;
 122         if (phd->status == HTTP_SENT_GET_REQUEST) {
 123                 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 124                 if (t->error >= 0) {
 125                         PARA_INFO_LOG("received ok msg, streaming\n");
 126                         phd->status = HTTP_STREAMING;
 127                 }
 128                 return;
 129         }
 130         if (rn->loaded >= BUFSIZE) {
 131                 t->error = -E_HTTP_RECV_OVERRUN;
 132                 return;
 133         }
 134         t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 135                 BUFSIZE - rn->loaded);
 136         if (t->error > 0) {
 137                 rn->loaded += t->error;
 138                 return;
 139         }
 140         if (!t->error)
 141                 t->error = -E_RECV_EOF;
 142 }
 143
 144 static void http_recv_close(struct receiver_node *rn)
 145 {
 146         struct private_http_recv_data *phd = rn->private_data;
 147         close(phd->fd);
 148         free(rn->buf);
 149         free(rn->private_data);
 150 }
 151
 152 static void *http_recv_parse_config(int argc, char **argv)
 153 {
 154         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 155
 156         if (!http_recv_cmdline_parser(argc, argv, tmp))
 157                 return tmp;
 158         free(tmp);
 159         return NULL;
 160 }
 161
 162 static int http_recv_open(struct receiver_node *rn)
 163 {
 164         struct private_http_recv_data *phd;
 165         struct http_recv_args_info *conf = rn->conf;
 166         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 167                 conf->port_arg);
 168
 169         if (ret < 0)
 170                 return ret;
 171         fd = ret;
 172         ret = mark_fd_nonblocking(fd);
 173         if (ret < 0) {
 174                 close(fd);
 175                 return ret;
 176         }
 177         rn->buf = para_calloc(BUFSIZE);
 178         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 179         phd->fd = fd;
 180         phd->status = HTTP_CONNECTED;
 181         return 1;
 182 }
 183
 184 /**
 185  * the init function of the http receiver
 186  *
 187  * \param r pointer to the receiver struct to initialize
 188  *
 189  * Just initialize all function pointers of \a r.
 190  */
 191 void http_recv_init(struct receiver *r)
 192 {
 193         struct http_recv_args_info dummy;
 194
 195         http_recv_cmdline_parser_init(&dummy);
 196         r->open = http_recv_open;
 197         r->close = http_recv_close;
 198         r->pre_select = http_recv_pre_select;
 199         r->post_select = http_recv_post_select;
 200         r->shutdown = http_shutdown;
 201         r->parse_config = http_recv_parse_config;
 202         r->help = (struct ggo_help) {
 203                 .short_help = http_recv_args_info_help,
 204                 .detailed_help = http_recv_args_info_detailed_help
 205         };
 206         http_recv_cmdline_parser_free(&dummy);
 207 }