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