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 <regex.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "http.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "recv.h"
  20 #include "http_recv.cmdline.h"
  21 #include "net.h"
  22 #include "string.h"
  23 #include "fd.h"
  24
  25 /** the output buffer size of the http receiver */
  26 #define BUFSIZE (32 * 1024)
  27
  28 /**
  29  * the possible states of a http receiver node
  30  *
  31  * \sa receiver_node
  32  */
  33 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  34
  35 /**
  36  * data specific to the http receiver
  37  *
  38  * Each running instance of the http receiver reserves space for one such struct.
  39  */
  40 struct private_http_recv_data {
  41 /**
  42  *
  43  *
  44  * the current status of the http receiver node
  45  *
  46  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  47  * http receiver.
  48  *
  49  * \sa receiver::open, receiver_node.
  50  */
  51         enum http_recv_status status;
  52 /**
  53  *
  54  *
  55  * the file descriptor used for receiving the http stream
  56  *
  57  * The pre_select function of the http receiver adds this file descriptor to
  58  * the set of file decriptors which are checked for reading/writing (depending
  59  * on the current status) by the select loop of the application (para_audiod or
  60  * para_recv).
  61  *
  62  * The post_select function of the http receiver uses \a fd, if ready, to
  63  * establish the http connection, and updates \a status according to the new
  64  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  65  * going to be only checked for reading. If data is available, it is read into
  66  * the output buffer of the receiver node by post_select.
  67  *
  68  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  69  */
  70         int fd;
  71 };
  72
  73 static void http_shutdown(void)
  74 {
  75         return;
  76 }
  77
  78 static char *make_request_msg(void)
  79 {
  80         char *ret, *hn = para_hostname();
  81         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  82                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  83         free(hn);
  84         return ret;
  85 }
  86
  87 static void http_recv_pre_select(struct sched *s, struct task *t)
  88 {
  89         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  90         struct private_http_recv_data *phd = rn->private_data;
  91
  92         t->error = 0;
  93         if  (phd->status == HTTP_CONNECTED)
  94                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  95         else
  96                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  97 }
  98
  99
 100 static void http_recv_post_select(struct sched *s, struct task *t)
 101 {
 102         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 103         struct private_http_recv_data *phd = rn->private_data;
 104
 105         if (rn->output_error && *rn->output_error < 0) {
 106                 t->error = *rn->output_error;
 107                 return;
 108         }
 109         if  (phd->status == HTTP_CONNECTED) {
 110                 char *rq;
 111                 if (!FD_ISSET(phd->fd, &s->wfds))
 112                         return;
 113                 rq = make_request_msg();
 114                 PARA_INFO_LOG("sending http request\n");
 115                 t->error = send_va_buffer(phd->fd, "%s", rq);
 116                 free(rq);
 117                 if (t->error >= 0)
 118                         phd->status = HTTP_SENT_GET_REQUEST;
 119                 return;
 120         }
 121         if (!FD_ISSET(phd->fd, &s->rfds))
 122                 return;
 123         if (phd->status == HTTP_SENT_GET_REQUEST) {
 124                 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 125                 if (t->error >= 0) {
 126                         PARA_INFO_LOG("received ok msg, streaming\n");
 127                         phd->status = HTTP_STREAMING;
 128                 }
 129                 return;
 130         }
 131         if (rn->loaded >= BUFSIZE) {
 132                 t->error = -E_HTTP_RECV_OVERRUN;
 133                 return;
 134         }
 135         t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 136                 BUFSIZE - rn->loaded);
 137         if (t->error > 0) {
 138                 rn->loaded += t->error;
 139                 return;
 140         }
 141         if (!t->error)
 142                 t->error = -E_RECV_EOF;
 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 http_recv_args_info *conf = rn->conf;
 167         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 168                 conf->port_arg);
 169
 170         if (ret < 0)
 171                 return ret;
 172         fd = ret;
 173         ret = mark_fd_nonblocking(fd);
 174         if (ret < 0) {
 175                 close(fd);
 176                 return ret;
 177         }
 178         rn->buf = para_calloc(BUFSIZE);
 179         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 180         phd->fd = fd;
 181         phd->status = HTTP_CONNECTED;
 182         return 1;
 183 }
 184
 185 /**
 186  * the init function of the http receiver
 187  *
 188  * \param r pointer to the receiver struct to initialize
 189  *
 190  * Just initialize all function pointers of \a r.
 191  */
 192 void http_recv_init(struct receiver *r)
 193 {
 194         struct http_recv_args_info dummy;
 195
 196         http_recv_cmdline_parser_init(&dummy);
 197         r->open = http_recv_open;
 198         r->close = http_recv_close;
 199         r->pre_select = http_recv_pre_select;
 200         r->post_select = http_recv_post_select;
 201         r->shutdown = http_shutdown;
 202         r->parse_config = http_recv_parse_config;
 203         r->help = (struct ggo_help) {
 204                 .short_help = http_recv_args_info_help,
 205                 .detailed_help = http_recv_args_info_detailed_help
 206         };
 207         http_recv_cmdline_parser_free(&dummy);
 208 }