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         int ret;
  93
  94         if (rn->btrn) {
  95                 ret = generic_recv_pre_select(s, t);
  96                 if (ret <= 0)
  97                         return;
  98         }
  99         t->error = 0;
 100         if  (phd->status == HTTP_CONNECTED)
 101                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
 102         else
 103                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
 104 }
 105
 106 #define HTTP_RECV_READ_BUF_SIZE 16384
 107
 108 static void http_recv_post_select(struct sched *s, struct task *t)
 109 {
 110         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 111         struct private_http_recv_data *phd = rn->private_data;
 112         struct btr_node *btrn = rn->btrn;
 113         int ret;
 114
 115         t->error = 0;
 116         if (btrn) {
 117                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 118                 if (ret < 0)
 119                         goto err;
 120                 if (ret == 0)
 121                         return;
 122         } else {
 123                 if (rn->output_error && *rn->output_error < 0) {
 124                         ret = *rn->output_error;
 125                         goto err;
 126                 }
 127         }
 128         if (phd->status == HTTP_CONNECTED) {
 129                 char *rq;
 130                 if (!FD_ISSET(phd->fd, &s->wfds))
 131                         return;
 132                 rq = make_request_msg();
 133                 PARA_INFO_LOG("sending http request\n");
 134                 ret = send_va_buffer(phd->fd, "%s", rq);
 135                 free(rq);
 136                 if (ret < 0)
 137                         goto err;
 138                 phd->status = HTTP_SENT_GET_REQUEST;
 139                 return;
 140         }
 141         if (!FD_ISSET(phd->fd, &s->rfds))
 142                 return;
 143         if (phd->status == HTTP_SENT_GET_REQUEST) {
 144                 ret = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 145                 if (ret < 0)
 146                         goto err;
 147                 PARA_INFO_LOG("received ok msg, streaming\n");
 148                 phd->status = HTTP_STREAMING;
 149                 return;
 150         }
 151         if (btrn) {
 152                 char *buf;
 153
 154                 buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
 155                 ret = recv_bin_buffer(phd->fd, buf, HTTP_RECV_READ_BUF_SIZE);
 156                 if (ret == 0)
 157                         ret = -E_RECV_EOF;
 158                 if (ret < 0) {
 159                         free(buf);
 160                         goto err;
 161                 }
 162                 btr_add_output(buf, ret, btrn);
 163                 return;
 164         }
 165         ret = -E_HTTP_RECV_OVERRUN;
 166         if (rn->loaded >= BUFSIZE)
 167                 goto err;
 168         ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 169                 BUFSIZE - rn->loaded);
 170         if (ret == 0)
 171                 ret = -E_RECV_EOF;
 172         if (ret < 0)
 173                 goto err;
 174         rn->loaded += ret;
 175         return;
 176 err:
 177         if (btrn)
 178                 btr_remove_node(rn->btrn);
 179         t->error = ret;
 180 }
 181
 182 static void http_recv_close(struct receiver_node *rn)
 183 {
 184         struct private_http_recv_data *phd = rn->private_data;
 185
 186         close(phd->fd);
 187         free(rn->buf);
 188         free(rn->private_data);
 189 }
 190
 191 static void *http_recv_parse_config(int argc, char **argv)
 192 {
 193         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 194
 195         if (!http_recv_cmdline_parser(argc, argv, tmp))
 196                 return tmp;
 197         free(tmp);
 198         return NULL;
 199 }
 200
 201 static int http_recv_open(struct receiver_node *rn)
 202 {
 203         struct private_http_recv_data *phd;
 204         struct http_recv_args_info *conf = rn->conf;
 205         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 206                 conf->port_arg);
 207
 208         if (ret < 0)
 209                 return ret;
 210         fd = ret;
 211         ret = mark_fd_nonblocking(fd);
 212         if (ret < 0) {
 213                 close(fd);
 214                 return ret;
 215         }
 216         rn->buf = para_calloc(BUFSIZE);
 217         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 218         phd->fd = fd;
 219         phd->status = HTTP_CONNECTED;
 220         return 1;
 221 }
 222
 223 static void http_recv_free_config(void *conf)
 224 {
 225         http_recv_cmdline_parser_free(conf);
 226 }
 227
 228 /**
 229  * The init function of the http receiver.
 230  *
 231  * \param r Pointer to the receiver struct to initialize.
 232  *
 233  * This initializes all function pointers of \a r.
 234  */
 235 void http_recv_init(struct receiver *r)
 236 {
 237         struct http_recv_args_info dummy;
 238
 239         http_recv_cmdline_parser_init(&dummy);
 240         r->open = http_recv_open;
 241         r->close = http_recv_close;
 242         r->pre_select = http_recv_pre_select;
 243         r->post_select = http_recv_post_select;
 244         r->shutdown = http_shutdown;
 245         r->parse_config = http_recv_parse_config;
 246         r->free_config = http_recv_free_config;
 247         r->help = (struct ggo_help) {
 248                 .short_help = http_recv_args_info_help,
 249                 .detailed_help = http_recv_args_info_detailed_help
 250         };
 251         http_recv_cmdline_parser_free(&dummy);
 252 }