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 "para.h"
  15 #include "error.h"
  16 #include "dccp.h"
  17 #include "list.h"
  18 #include "sched.h"
  19 #include "recv.h"
  20 #include "string.h"
  21 #include "net.h"
  22 #include "fd.h"
  23
  24 #include "dccp_recv.cmdline.h"
  25
  26 /* needed by getaddrinfo */
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <netdb.h>
  30
  31 /** the size of the output buffer */
  32 #define DCCP_BUFSIZE 40960
  33
  34 /**
  35  * data specific to the dccp receiver
  36  *
  37  * \sa receiver receiver_node
  38  */
  39 struct private_dccp_recv_data {
  40         /** the file descriptor for the dccp socket */
  41         int fd;
  42 };
  43
  44
  45 static void dccp_recv_close(struct receiver_node *rn)
  46 {
  47
  48         struct private_dccp_recv_data *pdd = rn->private_data;
  49
  50         if (pdd && pdd->fd > 0)
  51                 close(pdd->fd);
  52         free(rn->buf);
  53         rn->buf = NULL;
  54         free(rn->private_data);
  55         rn->private_data = NULL;
  56 }
  57
  58
  59 static int dccp_recv_open(struct receiver_node *rn)
  60 {
  61         struct private_dccp_recv_data *pdd;
  62         struct dccp_recv_args_info *conf = rn->conf;
  63         int ret;
  64         struct addrinfo *ai;
  65         char *tmp;
  66
  67         rn->buf = para_calloc(DCCP_BUFSIZE);
  68         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  69         pdd = rn->private_data;
  70         ret = dccp_get_socket();
  71         if (ret < 0)
  72                 goto err_out;
  73         pdd->fd = ret;
  74
  75         tmp = make_message("%d", conf->port_arg);
  76         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  77         free(tmp);
  78         if (ret) {
  79                 ret = -E_ADDR_INFO;
  80                 goto err_out;
  81         }
  82         ret = dccp_set_socket(pdd->fd);
  83         if (ret < 0)
  84                 goto err_out;
  85         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  86         ret = connect(pdd->fd, ai->ai_addr, ai->ai_addrlen);
  87         freeaddrinfo(ai);
  88         if (ret < 0) {
  89                 ret = -E_DCCP_CONNECT;
  90                 goto err_out;
  91         }
  92         mark_fd_nonblock(pdd->fd);
  93         return 1;
  94 err_out:
  95         dccp_recv_close(rn);
  96         return ret;
  97 }
  98
  99 static void dccp_shutdown(void)
 100 {
 101         ; /* nothing to do */
 102 }
 103
 104 static void *dccp_recv_parse_config(int argc, char **argv)
 105 {
 106         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
 107
 108         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 109                 return tmp;
 110         free(tmp);
 111         return NULL;
 112 }
 113
 114 static void dccp_recv_pre_select(struct sched *s, struct task *t)
 115 {
 116         struct receiver_node *rn = t->private_data;
 117         struct private_dccp_recv_data *pdd = rn->private_data;
 118
 119         t->ret = 1;
 120         para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
 121 }
 122
 123 static void dccp_recv_post_select(struct sched *s, struct task *t)
 124 {
 125         struct receiver_node *rn = t->private_data;
 126         struct private_dccp_recv_data *pdd = rn->private_data;
 127
 128         t->ret = -E_DCCP_RECV_EOF;
 129         if (rn->output_eof && *rn->output_eof)
 130                 goto out;
 131         t->ret = 1;
 132         if (!s->select_ret || !FD_ISSET(pdd->fd, &s->rfds))
 133                 goto out; /* nothing to do */
 134         t->ret = -E_DCCP_OVERRUN;
 135         if (rn->loaded >= DCCP_BUFSIZE)
 136                 goto out;
 137         t->ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 138                 DCCP_BUFSIZE - rn->loaded);
 139         if (t->ret <= 0) {
 140                 if (!t->ret)
 141                         t->ret = -E_DCCP_RECV_EOF;
 142                 goto out;
 143         }
 144         rn->loaded += t->ret;
 145         return;
 146 out:
 147         if (t->ret < 0)
 148                 rn->eof = 1;
 149 }
 150
 151 /**
 152  * the init function of the dccp receiver
 153  *
 154  * \param r pointer to the receiver struct to initialize
 155  *
 156  * Initialize all function pointers of \a r
 157  */
 158 void dccp_recv_init(struct receiver *r)
 159 {
 160         r->shutdown = dccp_shutdown;
 161         r->open = dccp_recv_open;
 162         r->close = dccp_recv_close;
 163         r->pre_select = dccp_recv_pre_select;
 164         r->post_select = dccp_recv_post_select;
 165         r->parse_config = dccp_recv_parse_config;
 166 }