dccp_recv.c

   1 /*
   2  * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file dccp_recv.c paraslash's dccp receiver */
   8
   9 /*
  10  * based on client.c of dccp-cs-0.01.tar.bz2,
  11  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  12  */
  13
  14 #include <sys/types.h>
  15 #include <dirent.h>
  16
  17 #include "para.h"
  18 #include "error.h"
  19 #include "dccp.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "recv.h"
  23 #include "string.h"
  24 #include "net.h"
  25 #include "fd.h"
  26
  27 #include "dccp_recv.cmdline.h"
  28
  29 /** the size of the output buffer */
  30 #define DCCP_BUFSIZE 40960
  31
  32 /**
  33  * data specific to the dccp receiver
  34  *
  35  * \sa receiver receiver_node
  36  */
  37 struct private_dccp_recv_data {
  38         /** the file descriptor for the dccp socket */
  39         int fd;
  40 };
  41
  42
  43 static void dccp_recv_close(struct receiver_node *rn)
  44 {
  45
  46         struct private_dccp_recv_data *pdd = rn->private_data;
  47
  48         if (pdd && pdd->fd > 0)
  49                 close(pdd->fd);
  50         free(rn->buf);
  51         rn->buf = NULL;
  52         free(rn->private_data);
  53         rn->private_data = NULL;
  54 }
  55
  56
  57 static int dccp_recv_open(struct receiver_node *rn)
  58 {
  59         struct private_dccp_recv_data *pdd;
  60         struct dccp_recv_args_info *conf = rn->conf;
  61         int ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg, conf->port_arg);
  62
  63         if (ret < 0)
  64                 return ret;
  65
  66         rn->buf = para_calloc(DCCP_BUFSIZE);
  67         rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
  68
  69         pdd->fd = ret;
  70         mark_fd_nonblocking(pdd->fd);
  71         return 1;
  72 }
  73
  74 static void dccp_shutdown(void)
  75 {
  76         ; /* nothing to do */
  77 }
  78
  79 static void *dccp_recv_parse_config(int argc, char **argv)
  80 {
  81         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
  82
  83         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
  84                 return tmp;
  85         free(tmp);
  86         return NULL;
  87 }
  88
  89 static void dccp_recv_pre_select(struct sched *s, struct task *t)
  90 {
  91         struct receiver_node *rn = t->private_data;
  92         struct private_dccp_recv_data *pdd = rn->private_data;
  93
  94         t->ret = 1;
  95         para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
  96 }
  97
  98 static void dccp_recv_post_select(struct sched *s, struct task *t)
  99 {
 100         struct receiver_node *rn = t->private_data;
 101         struct private_dccp_recv_data *pdd = rn->private_data;
 102
 103         t->ret = -E_DCCP_RECV_EOF;
 104         if (rn->output_eof && *rn->output_eof)
 105                 goto out;
 106         t->ret = 1;
 107         if (!s->select_ret || !FD_ISSET(pdd->fd, &s->rfds))
 108                 goto out; /* nothing to do */
 109         t->ret = -E_DCCP_OVERRUN;
 110         if (rn->loaded >= DCCP_BUFSIZE)
 111                 goto out;
 112         t->ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 113                 DCCP_BUFSIZE - rn->loaded);
 114         if (t->ret <= 0) {
 115                 if (!t->ret)
 116                         t->ret = -E_DCCP_RECV_EOF;
 117                 goto out;
 118         }
 119         rn->loaded += t->ret;
 120         return;
 121 out:
 122         if (t->ret < 0)
 123                 rn->eof = 1;
 124 }
 125
 126 /**
 127  * the init function of the dccp receiver
 128  *
 129  * \param r pointer to the receiver struct to initialize
 130  *
 131  * Initialize all function pointers of \a r
 132  */
 133 void dccp_recv_init(struct receiver *r)
 134 {
 135         r->shutdown = dccp_shutdown;
 136         r->open = dccp_recv_open;
 137         r->close = dccp_recv_close;
 138         r->pre_select = dccp_recv_pre_select;
 139         r->post_select = dccp_recv_post_select;
 140         r->parse_config = dccp_recv_parse_config;
 141 }