dccp_send.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_send.c Paraslash's dccp sender. */
   8
   9 /*
  10  * based on server.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 #include <osl.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "string.h"
  21 #include "afh.h"
  22 #include "afs.h"
  23 #include "server.h"
  24 #include "net.h"
  25 #include "list.h"
  26 #include "vss.h"
  27 #include "send.h"
  28 #include "fd.h"
  29 #include "close_on_fork.h"
  30 #include "chunk_queue.h"
  31 #include "server.cmdline.h"
  32 #include "acl.h"
  33
  34 /** Do not write more than that many bytes at once. */
  35 #define DCCP_MAX_BYTES_PER_WRITE 1024
  36
  37 static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
  38
  39 static void dccp_pre_select(int *max_fileno, fd_set *rfds,
  40                 __a_unused fd_set *wfds)
  41 {
  42         if (dss->listen_fd >= 0)
  43                 para_fd_set(dss->listen_fd, rfds, max_fileno);
  44 }
  45
  46 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  47 {
  48         struct sender_client *sc;
  49
  50         if (dss->listen_fd < 0 || !FD_ISSET(dss->listen_fd, rfds))
  51                 return;
  52         sc = accept_sender_client(dss);
  53         if (!sc)
  54                 return;
  55         /*
  56          * Bypass unused CCID paths: the sender does not receive application data
  57          * from the client; by shutting down this unused communication path we can
  58          * reduce processing costs a bit. See analogous comment in dccp_recv.c.
  59          */
  60         if (shutdown(sc->fd, SHUT_RD) >= 0)
  61                 return;
  62         PARA_WARNING_LOG("%s\n", strerror(errno));
  63         shutdown_client(sc, dss);
  64 }
  65
  66 static void dccp_send(long unsigned current_chunk,
  67                 __a_unused long unsigned chunks_sent, const char *buf,
  68                 size_t len, const char *header_buf, size_t header_len)
  69 {
  70         struct sender_client *sc, *tmp;
  71
  72         list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
  73                 send_chunk(sc, dss, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf,
  74                         len, header_buf, header_len);
  75 }
  76
  77 static void dccp_shutdown_clients(void)
  78 {
  79         shutdown_clients(dss);
  80 }
  81
  82 static int dccp_com_on(__a_unused struct sender_command_data *scd)
  83 {
  84         return generic_com_on(dss, IPPROTO_DCCP);
  85 }
  86
  87 static int dccp_com_off(__a_unused struct sender_command_data *scd)
  88 {
  89         generic_com_off(dss);
  90         return 1;
  91 }
  92
  93
  94 static int dccp_com_deny(struct sender_command_data *scd)
  95 {
  96         generic_com_deny(scd, dss);
  97         return 1;
  98 }
  99
 100 static int dccp_com_allow(struct sender_command_data *scd)
 101 {
 102         generic_com_allow(scd, dss);
 103         return 1;
 104 }
 105
 106 static char *dccp_info(void)
 107 {
 108         return get_sender_info(dss, "dccp");
 109 }
 110
 111 /**
 112  * The init function of the dccp sender.
 113  *
 114  * \param s pointer to the dccp sender struct.
 115  *
 116  * It initializes all function pointers of \a s and starts
 117  * listening on the given port.
 118  */
 119 void dccp_send_init(struct sender *s)
 120 {
 121         int ret;
 122
 123         s->info = dccp_info;
 124         s->send = dccp_send;
 125         s->pre_select = dccp_pre_select;
 126         s->post_select = dccp_post_select;
 127         s->shutdown_clients = dccp_shutdown_clients;
 128         s->help = generic_sender_help;
 129         s->client_cmds[SENDER_ON] = dccp_com_on;
 130         s->client_cmds[SENDER_OFF] = dccp_com_off;
 131         s->client_cmds[SENDER_DENY] = dccp_com_deny;
 132         s->client_cmds[SENDER_ALLOW] = dccp_com_allow;
 133         s->client_cmds[SENDER_ADD] = NULL;
 134         s->client_cmds[SENDER_DELETE] = NULL;
 135
 136         init_sender_status(dss, conf.dccp_access_arg, conf.dccp_access_given,
 137                 conf.dccp_port_arg, conf.dccp_max_clients_arg,
 138                 conf.dccp_default_deny_given);
 139         ret = generic_com_on(dss, IPPROTO_DCCP);
 140         if (ret < 0)
 141                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 142 }