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
  28 #include "dccp_recv.cmdline.h"
  29
  30 /** the size of the output buffer */
  31 #define DCCP_BUFSIZE 40960
  32
  33 /**
  34  * data specific to the dccp receiver
  35  *
  36  * \sa receiver receiver_node
  37  */
  38 struct private_dccp_recv_data {
  39         /** the file descriptor for the dccp socket */
  40         int fd;
  41 };
  42
  43
  44 static void dccp_recv_close(struct receiver_node *rn)
  45 {
  46
  47         struct private_dccp_recv_data *pdd = rn->private_data;
  48
  49         if (pdd && pdd->fd > 0)
  50                 close(pdd->fd);
  51         free(rn->buf);
  52         rn->buf = NULL;
  53         free(rn->private_data);
  54         rn->private_data = NULL;
  55 }
  56
  57
  58 static int dccp_recv_open(struct receiver_node *rn)
  59 {
  60         struct private_dccp_recv_data *pdd;
  61         struct dccp_recv_args_info *conf = rn->conf;
  62         int fd, ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg,
  63                 conf->port_arg);
  64
  65         if (ret < 0)
  66                 return ret;
  67         fd = ret;
  68         /*
  69          * Disable unused CCIDs: the receiver does not send any application
  70          * data to the server. By shutting down this unused path we reduce
  71          * internal processing costs, as the unused CCIDs (in the kernel) are
  72          * then bypassed.
  73          */
  74         if (shutdown(fd, SHUT_WR) < 0) {
  75                 ret = -ERRNO_TO_PARA_ERROR(errno);
  76                 goto err;
  77         }
  78         ret = mark_fd_nonblocking(fd);
  79         if (ret < 0)
  80                 goto err;
  81         rn->buf = para_calloc(DCCP_BUFSIZE);
  82         rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
  83         pdd->fd = fd;
  84         return 1;
  85 err:
  86         close(fd);
  87         return ret;
  88 }
  89
  90 static void dccp_shutdown(void)
  91 {
  92         ; /* nothing to do */
  93 }
  94
  95 static void *dccp_recv_parse_config(int argc, char **argv)
  96 {
  97         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
  98
  99         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 100                 return tmp;
 101         free(tmp);
 102         return NULL;
 103 }
 104
 105 static void dccp_recv_pre_select(struct sched *s, struct task *t)
 106 {
 107         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 108         struct private_dccp_recv_data *pdd = rn->private_data;
 109
 110         t->error = 0;
 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
 119         if (rn->output_error && *rn->output_error < 0) {
 120                 t->error = *rn->output_error;
 121                 return;
 122         }
 123         if (!FD_ISSET(pdd->fd, &s->rfds))
 124                 return; /* nothing to do */
 125         if (rn->loaded >= DCCP_BUFSIZE) {
 126                 t->error = -E_DCCP_OVERRUN;
 127                 return;
 128         }
 129         t->error = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 130                 DCCP_BUFSIZE - rn->loaded);
 131         if (t->error > 0) {
 132                 rn->loaded += t->error;
 133                 return;
 134         }
 135         if (!t->error)
 136                 t->error = -E_RECV_EOF;
 137 }
 138
 139 static void dccp_recv_free_config(void *conf)
 140 {
 141         dccp_recv_cmdline_parser_free(conf);
 142 }
 143
 144 /**
 145  * The init function of the dccp receiver.
 146  *
 147  * \param r Pointer to the receiver struct to initialize.
 148  *
 149  * Initialize all function pointers of \a r.
 150  */
 151 void dccp_recv_init(struct receiver *r)
 152 {
 153         struct dccp_recv_args_info dummy;
 154
 155         dccp_recv_cmdline_parser_init(&dummy);
 156         r->shutdown = dccp_shutdown;
 157         r->open = dccp_recv_open;
 158         r->close = dccp_recv_close;
 159         r->pre_select = dccp_recv_pre_select;
 160         r->post_select = dccp_recv_post_select;
 161         r->parse_config = dccp_recv_parse_config;
 162         r->free_config = dccp_recv_free_config;
 163         r->help = (struct ggo_help) {
 164                 .short_help = dccp_recv_args_info_help,
 165                 .detailed_help = dccp_recv_args_info_detailed_help
 166         };
 167         dccp_recv_cmdline_parser_free(&dummy);
 168 }