http_recv.c

   1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file http_recv.c paraslash's http receiver */
   4
   5 #include <regex.h>
   6 #include <netinet/in.h>
   7 #include <sys/socket.h>
   8 #include <sys/types.h>
   9 #include <arpa/inet.h>
  10 #include <sys/un.h>
  11 #include <netdb.h>
  12 #include <lopsub.h>
  13
  14 #include "recv_cmd.lsg.h"
  15 #include "para.h"
  16 #include "error.h"
  17 #include "http.h"
  18 #include "list.h"
  19 #include "sched.h"
  20 #include "buffer_tree.h"
  21 #include "recv.h"
  22 #include "net.h"
  23 #include "string.h"
  24 #include "fd.h"
  25
  26 /**
  27  * the possible states of a http receiver node
  28  *
  29  * \sa \ref receiver_node.
  30  */
  31 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  32
  33 /**
  34  * Data specific to the http receiver.
  35  *
  36  * Each running instance of the http receiver reserves space for one such struct.
  37  */
  38 struct private_http_recv_data {
  39         /**
  40          * The current status of the http receiver node.
  41          *
  42          * It gets initialized to \p HTTP_CONNECTED by the open function of the
  43          * http receiver.
  44          *
  45          * \sa \ref receiver::open, \ref receiver_node.
  46          */
  47         enum http_recv_status status;
  48 };
  49
  50 static char *make_request_msg(void)
  51 {
  52         char *ret, *hn = para_hostname();
  53         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  54                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  55         free(hn);
  56         return ret;
  57 }
  58
  59 static void http_recv_pre_select(struct sched *s, void *context)
  60 {
  61         struct receiver_node *rn = context;
  62         struct private_http_recv_data *phd = rn->private_data;
  63
  64         if (generic_recv_pre_select(s, rn) <= 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 int http_recv_post_select(struct sched *s, void *context)
  78 {
  79         struct receiver_node *rn = context;
  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         ret = task_get_notification(rn->task);
  87         if (ret < 0)
  88                 goto out;
  89         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
  90         if (ret < 0)
  91                 goto out;
  92         if (ret == 0)
  93                 return 0;
  94         if (phd->status == HTTP_CONNECTED) {
  95                 char *rq;
  96                 if (!FD_ISSET(rn->fd, &s->wfds))
  97                         return 0;
  98                 rq = make_request_msg();
  99                 PARA_INFO_LOG("sending http request\n");
 100                 ret = write_va_buffer(rn->fd, "%s", rq);
 101                 free(rq);
 102                 if (ret < 0)
 103                         goto out;
 104                 phd->status = HTTP_SENT_GET_REQUEST;
 105                 return 0;
 106         }
 107         if (phd->status == HTTP_SENT_GET_REQUEST) {
 108                 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 109                 if (ret < 0)
 110                         goto out;
 111                 if (ret == 0)
 112                         return 0;
 113                 PARA_INFO_LOG("received ok msg, streaming\n");
 114                 phd->status = HTTP_STREAMING;
 115                 return 0;
 116         }
 117         ret = -E_HTTP_RECV_OVERRUN;
 118         iovcnt = btr_pool_get_buffers(rn->btrp, iov);
 119         if (iovcnt == 0)
 120                 goto out;
 121         ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
 122         if (num_bytes == 0)
 123                 goto out;
 124         if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
 125                 btr_add_output_pool(rn->btrp, num_bytes, btrn);
 126         else { /* both buffers contain data */
 127                 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
 128                 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
 129         }
 130 out:
 131         if (ret < 0)
 132                 btr_remove_node(&rn->btrn);
 133         return ret;
 134 }
 135
 136 static void http_recv_close(struct receiver_node *rn)
 137 {
 138         close(rn->fd);
 139         btr_pool_free(rn->btrp);
 140         free(rn->private_data);
 141 }
 142
 143 static int http_recv_open(struct receiver_node *rn)
 144 {
 145         struct private_http_recv_data *phd;
 146         struct lls_parse_result *lpr = rn->lpr;
 147         const char *r_i = RECV_CMD_OPT_STRING_VAL(HTTP, HOST, lpr);
 148         uint32_t r_p = RECV_CMD_OPT_UINT32_VAL(HTTP, PORT, lpr);
 149         int fd, ret = para_connect_simple(IPPROTO_TCP, r_i, r_p);
 150
 151         if (ret < 0)
 152                 return ret;
 153         fd = ret;
 154         ret = mark_fd_nonblocking(fd);
 155         if (ret < 0) {
 156                 close(fd);
 157                 return ret;
 158         }
 159         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 160         rn->fd = fd;
 161         phd->status = HTTP_CONNECTED;
 162         rn->btrp = btr_pool_new("http_recv", 320 * 1024);
 163         return 1;
 164 }
 165
 166 /** See \ref recv_init(). */
 167 const struct receiver lsg_recv_cmd_com_http_user_data = {
 168         .open = http_recv_open,
 169         .close = http_recv_close,
 170         .pre_select = http_recv_pre_select,
 171         .post_select = http_recv_post_select,
 172 };