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 #include "buffer_tree.h"
  25
  26 /** the output buffer size of the http receiver */
  27 #define BUFSIZE (32 * 1024)
  28
  29 /**
  30  * the possible states of a http receiver node
  31  *
  32  * \sa receiver_node
  33  */
  34 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  35
  36 /**
  37  * data specific to the http receiver
  38  *
  39  * Each running instance of the http receiver reserves space for one such struct.
  40  */
  41 struct private_http_recv_data {
  42 /**
  43  *
  44  *
  45  * the current status of the http receiver node
  46  *
  47  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  48  * http receiver.
  49  *
  50  * \sa receiver::open, receiver_node.
  51  */
  52         enum http_recv_status status;
  53 /**
  54  *
  55  *
  56  * the file descriptor used for receiving the http stream
  57  *
  58  * The pre_select function of the http receiver adds this file descriptor to
  59  * the set of file decriptors which are checked for reading/writing (depending
  60  * on the current status) by the select loop of the application (para_audiod or
  61  * para_recv).
  62  *
  63  * The post_select function of the http receiver uses \a fd, if ready, to
  64  * establish the http connection, and updates \a status according to the new
  65  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  66  * going to be only checked for reading. If data is available, it is read into
  67  * the output buffer of the receiver node by post_select.
  68  *
  69  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  70  */
  71         int fd;
  72 };
  73
  74 static void http_shutdown(void)
  75 {
  76         return;
  77 }
  78
  79 static char *make_request_msg(void)
  80 {
  81         char *ret, *hn = para_hostname();
  82         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  83                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  84         free(hn);
  85         return ret;
  86 }
  87
  88 static void http_recv_pre_select(struct sched *s, struct task *t)
  89 {
  90         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  91         struct private_http_recv_data *phd = rn->private_data;
  92
  93         t->error = 0;
  94         if  (phd->status == HTTP_CONNECTED)
  95                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  96         else
  97                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  98 }
  99
 100 #define HTTP_RECV_MAX_PENDING (1024 * 1024)
 101 #define HTTP_RECV_READ_BUF_SIZE 4096
 102
 103 static void http_recv_post_select(struct sched *s, struct task *t)
 104 {
 105         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 106         struct private_http_recv_data *phd = rn->private_data;
 107         struct http_recv_args_info *conf = rn->conf;
 108
 109         if (rn->output_error && *rn->output_error < 0) {
 110                 t->error = *rn->output_error;
 111                 return;
 112         }
 113         if  (phd->status == HTTP_CONNECTED) {
 114                 char *rq;
 115                 if (!FD_ISSET(phd->fd, &s->wfds))
 116                         return;
 117                 rq = make_request_msg();
 118                 PARA_INFO_LOG("sending http request\n");
 119                 t->error = send_va_buffer(phd->fd, "%s", rq);
 120                 free(rq);
 121                 if (t->error >= 0)
 122                         phd->status = HTTP_SENT_GET_REQUEST;
 123                 return;
 124         }
 125         if (!FD_ISSET(phd->fd, &s->rfds))
 126                 return;
 127         if (phd->status == HTTP_SENT_GET_REQUEST) {
 128                 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 129                 if (t->error >= 0) {
 130                         PARA_INFO_LOG("received ok msg, streaming\n");
 131                         phd->status = HTTP_STREAMING;
 132                 }
 133                 return;
 134         }
 135         if (conf->buffer_tree_given) {
 136                 char *buf;
 137                 if (btr_bytes_pending(rn->btrn) > HTTP_RECV_MAX_PENDING) {
 138                         t->error = -E_HTTP_RECV_OVERRUN;
 139                         return;
 140                 }
 141                 buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
 142                 t->error = recv_bin_buffer(phd->fd, buf, HTTP_RECV_READ_BUF_SIZE);
 143                 if (t->error == 0)
 144                         t->error = -E_RECV_EOF;
 145                 if (t->error < 0) {
 146                         free(buf);
 147                         return;
 148                 }
 149                 btr_add_output(buf, t->error, rn->btrn);
 150                 return;
 151         }
 152         t->error = -E_HTTP_RECV_OVERRUN;
 153         if (rn->loaded >= BUFSIZE)
 154                 return;
 155         t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 156                 BUFSIZE - rn->loaded);
 157         if (t->error == 0)
 158                 t->error = -E_RECV_EOF;
 159 }
 160
 161 static void http_recv_close(struct receiver_node *rn)
 162 {
 163         struct private_http_recv_data *phd = rn->private_data;
 164         close(phd->fd);
 165         free(rn->buf);
 166         free(rn->private_data);
 167 }
 168
 169 static void *http_recv_parse_config(int argc, char **argv)
 170 {
 171         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 172
 173         if (!http_recv_cmdline_parser(argc, argv, tmp))
 174                 return tmp;
 175         free(tmp);
 176         return NULL;
 177 }
 178
 179 static int http_recv_open(struct receiver_node *rn)
 180 {
 181         struct private_http_recv_data *phd;
 182         struct http_recv_args_info *conf = rn->conf;
 183         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 184                 conf->port_arg);
 185
 186         if (ret < 0)
 187                 return ret;
 188         fd = ret;
 189         ret = mark_fd_nonblocking(fd);
 190         if (ret < 0) {
 191                 close(fd);
 192                 return ret;
 193         }
 194         rn->buf = para_calloc(BUFSIZE);
 195         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 196         phd->fd = fd;
 197         phd->status = HTTP_CONNECTED;
 198         return 1;
 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         struct http_recv_args_info dummy;
 211
 212         http_recv_cmdline_parser_init(&dummy);
 213         r->open = http_recv_open;
 214         r->close = http_recv_close;
 215         r->pre_select = http_recv_pre_select;
 216         r->post_select = http_recv_post_select;
 217         r->shutdown = http_shutdown;
 218         r->parse_config = http_recv_parse_config;
 219         r->help = (struct ggo_help) {
 220                 .short_help = http_recv_args_info_help,
 221                 .detailed_help = http_recv_args_info_detailed_help
 222         };
 223         http_recv_cmdline_parser_free(&dummy);
 224 }