http_recv.c

   1 /*
   2  * Copyright (C) 2005-2013 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
  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 "buffer_tree.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 /**
  26  * the possible states of a http receiver node
  27  *
  28  * \sa receiver_node
  29  */
  30 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  31
  32 /**
  33  * Data specific to the http receiver.
  34  *
  35  * Each running instance of the http receiver reserves space for one such struct.
  36  */
  37 struct private_http_recv_data {
  38         /**
  39          * The current status of the http receiver node.
  40          *
  41          * It gets initialized to \p HTTP_CONNECTED by the open function of the
  42          * http receiver.
  43          *
  44          * \sa receiver::open, receiver_node.
  45          */
  46         enum http_recv_status status;
  47 };
  48
  49 static char *make_request_msg(void)
  50 {
  51         char *ret, *hn = para_hostname();
  52         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  53                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  54         free(hn);
  55         return ret;
  56 }
  57
  58 static void http_recv_pre_select(struct sched *s, struct task *t)
  59 {
  60         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  61         struct private_http_recv_data *phd = rn->private_data;
  62
  63         if (generic_recv_pre_select(s, t) <= 0)
  64                 return;
  65         if  (phd->status == HTTP_CONNECTED)
  66                 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
  67         else
  68                 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
  69 }
  70
  71 /*
  72  * Establish the http connection. If already established, fill the buffer pool
  73  * area with data read from the socket. In any case, update the state of the
  74  * connection if necessary.
  75  */
  76 static int http_recv_post_select(struct sched *s, struct task *t)
  77 {
  78         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  79         struct private_http_recv_data *phd = rn->private_data;
  80         struct btr_node *btrn = rn->btrn;
  81         int ret, iovcnt;
  82         struct iovec iov[2];
  83         size_t num_bytes;
  84
  85         ret = task_get_notification(t);
  86         if (ret < 0)
  87                 goto out;
  88         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
  89         if (ret < 0)
  90                 goto out;
  91         if (ret == 0)
  92                 return 0;
  93         if (phd->status == HTTP_CONNECTED) {
  94                 char *rq;
  95                 if (!FD_ISSET(rn->fd, &s->wfds))
  96                         return 0;
  97                 rq = make_request_msg();
  98                 PARA_INFO_LOG("sending http request\n");
  99                 ret = write_va_buffer(rn->fd, "%s", rq);
 100                 free(rq);
 101                 if (ret < 0)
 102                         goto out;
 103                 phd->status = HTTP_SENT_GET_REQUEST;
 104                 return 0;
 105         }
 106         if (phd->status == HTTP_SENT_GET_REQUEST) {
 107                 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 108                 if (ret < 0)
 109                         goto out;
 110                 if (ret == 0)
 111                         return 0;
 112                 PARA_INFO_LOG("received ok msg, streaming\n");
 113                 phd->status = HTTP_STREAMING;
 114                 return 0;
 115         }
 116         ret = -E_HTTP_RECV_OVERRUN;
 117         iovcnt = btr_pool_get_buffers(rn->btrp, iov);
 118         if (iovcnt == 0)
 119                 goto out;
 120         ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
 121         if (num_bytes == 0)
 122                 goto out;
 123         if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
 124                 btr_add_output_pool(rn->btrp, num_bytes, btrn);
 125         else { /* both buffers contain data */
 126                 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
 127                 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
 128         }
 129 out:
 130         if (ret < 0)
 131                 btr_remove_node(&rn->btrn);
 132         return ret;
 133 }
 134
 135 static void http_recv_close(struct receiver_node *rn)
 136 {
 137         close(rn->fd);
 138         btr_pool_free(rn->btrp);
 139         free(rn->private_data);
 140 }
 141
 142 static void *http_recv_parse_config(int argc, char **argv)
 143 {
 144         struct http_recv_args_info *tmp = para_calloc(sizeof(*tmp));
 145
 146         http_recv_cmdline_parser(argc, argv, tmp);
 147         return tmp;
 148 }
 149
 150 static int http_recv_open(struct receiver_node *rn)
 151 {
 152         struct private_http_recv_data *phd;
 153         struct http_recv_args_info *conf = rn->conf;
 154         int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
 155                                                        conf->port_arg);
 156
 157         if (ret < 0)
 158                 return ret;
 159         fd = ret;
 160         ret = mark_fd_nonblocking(fd);
 161         if (ret < 0) {
 162                 close(fd);
 163                 return ret;
 164         }
 165         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 166         rn->fd = fd;
 167         phd->status = HTTP_CONNECTED;
 168         rn->btrp = btr_pool_new("http_recv", 320 * 1024);
 169         return 1;
 170 }
 171
 172 static void http_recv_free_config(void *conf)
 173 {
 174         http_recv_cmdline_parser_free(conf);
 175         free(conf);
 176 }
 177
 178 /**
 179  * The init function of the http receiver.
 180  *
 181  * \param r Pointer to the receiver struct to initialize.
 182  *
 183  * This initializes all function pointers of \a r.
 184  */
 185 void http_recv_init(struct receiver *r)
 186 {
 187         struct http_recv_args_info dummy;
 188
 189         http_recv_cmdline_parser_init(&dummy);
 190         r->open = http_recv_open;
 191         r->close = http_recv_close;
 192         r->pre_select = http_recv_pre_select;
 193         r->post_select = http_recv_post_select;
 194         r->parse_config = http_recv_parse_config;
 195         r->free_config = http_recv_free_config;
 196         r->help = (struct ggo_help)DEFINE_GGO_HELP(http_recv);
 197         http_recv_cmdline_parser_free(&dummy);
 198 }