http_recv.c

   1 /*
   2  * Copyright (C) 2005-2012 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 "recv.h"
  19 #include "http_recv.cmdline.h"
  20 #include "net.h"
  21 #include "string.h"
  22 #include "fd.h"
  23 #include "buffer_tree.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         t->error = 0;
  64         if (generic_recv_pre_select(s, t) <= 0)
  65                 return;
  66         if  (phd->status == HTTP_CONNECTED)
  67                 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
  68         else
  69                 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
  70 }
  71
  72 /*
  73  * Establish the http connection. If already established, fill the buffer pool
  74  * area with data read from the socket. In any case, update the state of the
  75  * connection if necessary.
  76  */
  77 static void http_recv_post_select(struct sched *s, struct task *t)
  78 {
  79         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  80         struct private_http_recv_data *phd = rn->private_data;
  81         struct btr_node *btrn = rn->btrn;
  82         int ret, iovcnt;
  83         struct iovec iov[2];
  84         size_t num_bytes;
  85
  86         t->error = 0;
  87         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
  88         if (ret < 0)
  89                 goto out;
  90         if (ret == 0)
  91                 return;
  92         if (phd->status == HTTP_CONNECTED) {
  93                 char *rq;
  94                 if (!FD_ISSET(rn->fd, &s->wfds))
  95                         return;
  96                 rq = make_request_msg();
  97                 PARA_INFO_LOG("sending http request\n");
  98                 ret = write_va_buffer(rn->fd, "%s", rq);
  99                 free(rq);
 100                 if (ret < 0)
 101                         goto out;
 102                 phd->status = HTTP_SENT_GET_REQUEST;
 103                 return;
 104         }
 105         if (phd->status == HTTP_SENT_GET_REQUEST) {
 106                 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 107                 if (ret < 0)
 108                         goto out;
 109                 if (ret == 0)
 110                         return;
 111                 PARA_INFO_LOG("received ok msg, streaming\n");
 112                 phd->status = HTTP_STREAMING;
 113                 return;
 114         }
 115         ret = -E_HTTP_RECV_OVERRUN;
 116         iovcnt = btr_pool_get_buffers(rn->btrp, iov);
 117         if (iovcnt == 0)
 118                 goto out;
 119         ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
 120         if (num_bytes == 0)
 121                 goto out;
 122         if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
 123                 btr_add_output_pool(rn->btrp, num_bytes, btrn);
 124         else { /* both buffers contain data */
 125                 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
 126                 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
 127         }
 128 out:
 129         if (ret >= 0)
 130                 return;
 131         btr_remove_node(&rn->btrn);
 132         t->error = 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         if (!http_recv_cmdline_parser(argc, argv, tmp))
 147                 return tmp;
 148         free(tmp);
 149         return NULL;
 150 }
 151
 152 static int http_recv_open(struct receiver_node *rn)
 153 {
 154         struct private_http_recv_data *phd;
 155         struct http_recv_args_info *conf = rn->conf;
 156         int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
 157                                                        conf->port_arg);
 158
 159         if (ret < 0)
 160                 return ret;
 161         fd = ret;
 162         ret = mark_fd_nonblocking(fd);
 163         if (ret < 0) {
 164                 close(fd);
 165                 return ret;
 166         }
 167         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 168         rn->fd = fd;
 169         phd->status = HTTP_CONNECTED;
 170         rn->btrp = btr_pool_new("http_recv", 320 * 1024);
 171         return 1;
 172 }
 173
 174 static void http_recv_free_config(void *conf)
 175 {
 176         http_recv_cmdline_parser_free(conf);
 177         free(conf);
 178 }
 179
 180 /**
 181  * The init function of the http receiver.
 182  *
 183  * \param r Pointer to the receiver struct to initialize.
 184  *
 185  * This initializes all function pointers of \a r.
 186  */
 187 void http_recv_init(struct receiver *r)
 188 {
 189         struct http_recv_args_info dummy;
 190
 191         http_recv_cmdline_parser_init(&dummy);
 192         r->open = http_recv_open;
 193         r->close = http_recv_close;
 194         r->pre_select = http_recv_pre_select;
 195         r->post_select = http_recv_post_select;
 196         r->parse_config = http_recv_parse_config;
 197         r->free_config = http_recv_free_config;
 198         r->help = (struct ggo_help) {
 199                 .short_help = http_recv_args_info_help,
 200                 .detailed_help = http_recv_args_info_detailed_help
 201         };
 202         http_recv_cmdline_parser_free(&dummy);
 203 }