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                 goto err;
 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                         goto err;
 123                 phd->status = HTTP_SENT_GET_REQUEST;
 124                 return;
 125         }
 126         if (!FD_ISSET(phd->fd, &s->rfds))
 127                 return;
 128         if (phd->status == HTTP_SENT_GET_REQUEST) {
 129                 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 130                 if (t->error < 0)
 131                         goto err;
 132                 PARA_INFO_LOG("received ok msg, streaming\n");
 133                 phd->status = HTTP_STREAMING;
 134                 return;
 135         }
 136         if (conf->buffer_tree_given) {
 137                 char *buf;
 138
 139                 if (btr_no_children(rn->btrn)) {
 140                         t->error = -E_HTTP_RECV_NO_CHILD;
 141                         goto err;
 142                 }
 143                 if (btr_bytes_pending(rn->btrn) > HTTP_RECV_MAX_PENDING) {
 144                         t->error = -E_HTTP_RECV_OVERRUN;
 145                         goto err;
 146                 }
 147                 buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
 148                 t->error = recv_bin_buffer(phd->fd, buf, HTTP_RECV_READ_BUF_SIZE);
 149                 if (t->error == 0)
 150                         t->error = -E_RECV_EOF;
 151                 if (t->error < 0) {
 152                         free(buf);
 153                         goto err;
 154                 }
 155                 btr_add_output(buf, t->error, rn->btrn);
 156                 return;
 157         }
 158         t->error = -E_HTTP_RECV_OVERRUN;
 159         if (rn->loaded >= BUFSIZE)
 160                 goto err;
 161         t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 162                 BUFSIZE - rn->loaded);
 163         if (t->error == 0)
 164                 t->error = -E_RECV_EOF;
 165         if (t->error < 0)
 166                 goto err;
 167         rn->loaded += t->error;
 168         return;
 169 err:
 170         if (conf->buffer_tree_given) {
 171                 btr_del_node(rn->btrn);
 172                 rn->btrn = NULL;
 173         }
 174 }
 175
 176 static void http_recv_close(struct receiver_node *rn)
 177 {
 178         struct private_http_recv_data *phd = rn->private_data;
 179         struct http_recv_args_info *conf = rn->conf;
 180
 181         if (conf->buffer_tree_given)
 182                 btr_del_node(rn->btrn);
 183         close(phd->fd);
 184         free(rn->buf);
 185         free(rn->private_data);
 186 }
 187
 188 static void *http_recv_parse_config(int argc, char **argv)
 189 {
 190         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 191
 192         if (!http_recv_cmdline_parser(argc, argv, tmp))
 193                 return tmp;
 194         free(tmp);
 195         return NULL;
 196 }
 197
 198 static int http_recv_open(struct receiver_node *rn)
 199 {
 200         struct private_http_recv_data *phd;
 201         struct http_recv_args_info *conf = rn->conf;
 202         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 203                 conf->port_arg);
 204
 205         if (ret < 0)
 206                 return ret;
 207         fd = ret;
 208         ret = mark_fd_nonblocking(fd);
 209         if (ret < 0) {
 210                 close(fd);
 211                 return ret;
 212         }
 213         rn->buf = para_calloc(BUFSIZE);
 214         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 215         phd->fd = fd;
 216         phd->status = HTTP_CONNECTED;
 217         if (conf->buffer_tree_given)
 218                 rn->btrn = btr_new_node("receiver", NULL, NULL, NULL);
 219         return 1;
 220 }
 221
 222 /**
 223  * the init function of the http receiver
 224  *
 225  * \param r pointer to the receiver struct to initialize
 226  *
 227  * Just initialize all function pointers of \a r.
 228  */
 229 void http_recv_init(struct receiver *r)
 230 {
 231         struct http_recv_args_info dummy;
 232
 233         http_recv_cmdline_parser_init(&dummy);
 234         r->open = http_recv_open;
 235         r->close = http_recv_close;
 236         r->pre_select = http_recv_pre_select;
 237         r->post_select = http_recv_post_select;
 238         r->shutdown = http_shutdown;
 239         r->parse_config = http_recv_parse_config;
 240         r->help = (struct ggo_help) {
 241                 .short_help = http_recv_args_info_help,
 242                 .detailed_help = http_recv_args_info_detailed_help
 243         };
 244         http_recv_cmdline_parser_free(&dummy);
 245 }