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 /** 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         struct btr_pool *btrp;
  43 };
  44
  45
  46 static void dccp_recv_close(struct receiver_node *rn)
  47 {
  48
  49         struct private_dccp_recv_data *pdd = rn->private_data;
  50
  51         if (pdd && pdd->fd > 0)
  52                 close(pdd->fd);
  53         free(rn->buf);
  54         rn->buf = NULL;
  55         free(rn->private_data);
  56         rn->private_data = NULL;
  57 }
  58
  59
  60 static int dccp_recv_open(struct receiver_node *rn)
  61 {
  62         struct private_dccp_recv_data *pdd;
  63         struct dccp_recv_args_info *conf = rn->conf;
  64         int fd, ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg,
  65                 conf->port_arg);
  66
  67         if (ret < 0)
  68                 return ret;
  69         fd = ret;
  70         /*
  71          * Disable unused CCIDs: the receiver does not send any application
  72          * data to the server. By shutting down this unused path we reduce
  73          * internal processing costs, as the unused CCIDs (in the kernel) are
  74          * then bypassed.
  75          */
  76         if (shutdown(fd, SHUT_WR) < 0) {
  77                 ret = -ERRNO_TO_PARA_ERROR(errno);
  78                 goto err;
  79         }
  80         ret = mark_fd_nonblocking(fd);
  81         if (ret < 0)
  82                 goto err;
  83         rn->buf = para_calloc(DCCP_BUFSIZE);
  84         rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
  85         pdd->btrp = btr_pool_new("dccp_recv", 320 * 1024);
  86         pdd->fd = fd;
  87         return 1;
  88 err:
  89         close(fd);
  90         return ret;
  91 }
  92
  93 static void *dccp_recv_parse_config(int argc, char **argv)
  94 {
  95         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
  96
  97         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
  98                 return tmp;
  99         free(tmp);
 100         return NULL;
 101 }
 102
 103 static void dccp_recv_pre_select(struct sched *s, struct task *t)
 104 {
 105         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 106         struct private_dccp_recv_data *pdd = rn->private_data;
 107
 108         t->error = 0;
 109         if (generic_recv_pre_select(s, t) <= 0)
 110                 return;
 111         para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
 112 }
 113
 114 static void dccp_recv_post_select(struct sched *s, struct task *t)
 115 {
 116         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 117         struct private_dccp_recv_data *pdd = rn->private_data;
 118         struct btr_node *btrn = rn->btrn;
 119         int ret;
 120         char *buf;
 121         size_t sz;
 122
 123         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 124         if (ret < 0)
 125                 goto err;
 126         if (ret == 0)
 127                 return;
 128         if (!FD_ISSET(pdd->fd, &s->rfds))
 129                 return; /* nothing to do */
 130         if (rn->loaded >= DCCP_BUFSIZE) {
 131                 t->error = -E_DCCP_OVERRUN;
 132                 return;
 133         }
 134         ret = -E_DCCP_OVERRUN;
 135         sz = btr_pool_get_buffer(pdd->btrp, &buf);
 136         if (sz == 0)
 137                 goto err;
 138         ret = recv_bin_buffer(pdd->fd, buf, sz);
 139         if (ret == 0)
 140                 ret = -E_RECV_EOF;
 141         if (ret < 0)
 142                 goto err;
 143         btr_add_output_pool(pdd->btrp, ret, btrn);
 144         return;
 145 err:
 146         btr_remove_node(rn->btrn);
 147         t->error = ret;
 148 }
 149
 150 static void dccp_recv_free_config(void *conf)
 151 {
 152         dccp_recv_cmdline_parser_free(conf);
 153 }
 154
 155 /**
 156  * The init function of the dccp receiver.
 157  *
 158  * \param r Pointer to the receiver struct to initialize.
 159  *
 160  * Initialize all function pointers of \a r.
 161  */
 162 void dccp_recv_init(struct receiver *r)
 163 {
 164         struct dccp_recv_args_info dummy;
 165
 166         dccp_recv_cmdline_parser_init(&dummy);
 167         r->open = dccp_recv_open;
 168         r->close = dccp_recv_close;
 169         r->pre_select = dccp_recv_pre_select;
 170         r->post_select = dccp_recv_post_select;
 171         r->parse_config = dccp_recv_parse_config;
 172         r->free_config = dccp_recv_free_config;
 173         r->help = (struct ggo_help) {
 174                 .short_help = dccp_recv_args_info_help,
 175                 .detailed_help = dccp_recv_args_info_detailed_help
 176         };
 177         dccp_recv_cmdline_parser_free(&dummy);
 178 }