dccp_recv.c

   1 /*
   2  * Copyright (C) 2006-2009 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 <regex.h>
  15 #include <sys/types.h>
  16 #include <dirent.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "ggo.h"
  23 #include "recv.h"
  24 #include "string.h"
  25 #include "net.h"
  26 #include "fd.h"
  27 #include "buffer_tree.h"
  28
  29 #include "dccp_recv.cmdline.h"
  30
  31 /**
  32  * data specific to the dccp receiver
  33  *
  34  * \sa receiver receiver_node
  35  */
  36 struct private_dccp_recv_data {
  37         /** the file descriptor for the dccp socket */
  38         int fd;
  39         struct btr_pool *btrp;
  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         btr_pool_free(pdd->btrp);
  51         free(rn->private_data);
  52         rn->private_data = NULL;
  53 }
  54
  55
  56 static int dccp_recv_open(struct receiver_node *rn)
  57 {
  58         struct private_dccp_recv_data *pdd;
  59         struct dccp_recv_args_info *conf = rn->conf;
  60         int fd, ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg,
  61                 conf->port_arg);
  62
  63         if (ret < 0)
  64                 return ret;
  65         fd = ret;
  66         /*
  67          * Disable unused CCIDs: the receiver does not send any application
  68          * data to the server. By shutting down this unused path we reduce
  69          * internal processing costs, as the unused CCIDs (in the kernel) are
  70          * then bypassed.
  71          */
  72         if (shutdown(fd, SHUT_WR) < 0) {
  73                 ret = -ERRNO_TO_PARA_ERROR(errno);
  74                 goto err;
  75         }
  76         ret = mark_fd_nonblocking(fd);
  77         if (ret < 0)
  78                 goto err;
  79         rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
  80         pdd->btrp = btr_pool_new("dccp_recv", 320 * 1024);
  81         pdd->fd = fd;
  82         return 1;
  83 err:
  84         close(fd);
  85         return ret;
  86 }
  87
  88 static void *dccp_recv_parse_config(int argc, char **argv)
  89 {
  90         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
  91
  92         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
  93                 return tmp;
  94         free(tmp);
  95         return NULL;
  96 }
  97
  98 static void dccp_recv_pre_select(struct sched *s, struct task *t)
  99 {
 100         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 101         struct private_dccp_recv_data *pdd = rn->private_data;
 102
 103         t->error = 0;
 104         if (generic_recv_pre_select(s, t) <= 0)
 105                 return;
 106         para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
 107 }
 108
 109 static void dccp_recv_post_select(struct sched *s, struct task *t)
 110 {
 111         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 112         struct private_dccp_recv_data *pdd = rn->private_data;
 113         struct btr_node *btrn = rn->btrn;
 114         struct iovec iov[2];
 115         int ret, iovcnt;
 116
 117         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 118         if (ret < 0)
 119                 goto err;
 120         if (ret == 0)
 121                 return;
 122         if (!FD_ISSET(pdd->fd, &s->rfds))
 123                 return; /* nothing to do */
 124         iovcnt = btr_pool_get_buffers(pdd->btrp, iov);
 125         ret = -E_DCCP_OVERRUN;
 126         if (iovcnt == 0)
 127                 goto err;
 128         ret = para_readv(pdd->fd, iov, iovcnt);
 129         if (ret == 0)
 130                 ret = -E_RECV_EOF;
 131         if (ret < 0)
 132                 goto err;
 133         if (ret <= iov[0].iov_len) /* only the first buffer was filled */
 134                 btr_add_output_pool(pdd->btrp, ret, btrn);
 135         else { /* both buffers contain data */
 136                 btr_add_output_pool(pdd->btrp, iov[0].iov_len, btrn);
 137                 btr_add_output_pool(pdd->btrp, ret - iov[0].iov_len, btrn);
 138         }
 139         return;
 140 err:
 141         btr_remove_node(rn->btrn);
 142         t->error = ret;
 143 }
 144
 145 static void dccp_recv_free_config(void *conf)
 146 {
 147         dccp_recv_cmdline_parser_free(conf);
 148         free(conf);
 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         struct dccp_recv_args_info dummy;
 161
 162         dccp_recv_cmdline_parser_init(&dummy);
 163         r->open = dccp_recv_open;
 164         r->close = dccp_recv_close;
 165         r->pre_select = dccp_recv_pre_select;
 166         r->post_select = dccp_recv_post_select;
 167         r->parse_config = dccp_recv_parse_config;
 168         r->free_config = dccp_recv_free_config;
 169         r->help = (struct ggo_help) {
 170                 .short_help = dccp_recv_args_info_help,
 171                 .detailed_help = dccp_recv_args_info_detailed_help
 172         };
 173         dccp_recv_cmdline_parser_free(&dummy);
 174 }