ipstreams/wvunixsocket.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * WvStream-based Unix domain socket connection class.  See wvunixsocket.h.
   6  */
   7 #include "wvistreamlist.h"
   8 #include "wvunixlistener.h"
   9 #include "wvunixsocket.h"
  10 #include "wvstringmask.h"
  11 #include "wvmoniker.h"
  12 #include "wvlinkerhack.h"
  13
  14 #if HAVE_ERRNO_H
  15 # include <errno.h>
  16 #endif
  17 #include <stdio.h>
  18 #if HAVE_SYS_TYPES_H
  19 # include <sys/types.h>
  20 #endif
  21 #if STDC_HEADERS
  22 # include <stdlib.h>
  23 # include <stddef.h>
  24 #else
  25 # if HAVE_STDLIB_H
  26 #  include <stdlib.h>
  27 # endif
  28 #endif
  29 #if HAVE_SYS_STAT_H
  30 # include <sys/stat.h>
  31 #endif
  32 #if HAVE_SYS_SOCKET_H
  33 # include <sys/socket.h>
  34 #endif
  35 #if HAVE_NETDB_H
  36 # include <netdb.h>
  37 #endif
  38 #if HAVE_NETINET_IN_H
  39 # include <netinet/in.h>
  40 #endif
  41 #if HAVE_NETINET_IP_H
  42 # if HAVE_NETINET_IN_SYSTM_H
  43 #  include <netinet/in_systm.h>
  44 # endif
  45 # include <netinet/ip.h>
  46 #endif
  47 #if HAVE_NETINET_TCP_H
  48 # include <netinet/tcp.h>
  49 #endif
  50
  51 #include <fcntl.h>
  52 #include <sys/un.h>
  53
  54 WV_LINK(WvUnixConn);
  55 WV_LINK(WvUnixListener);
  56
  57 static IWvStream *creator(WvStringParm s, IObject*)
  58 {
  59     return new WvUnixConn(s);
  60 }
  61
  62 static WvMoniker<IWvStream> reg("unix", creator);
  63
  64
  65 static IWvListener *listener(WvStringParm s, IObject *)
  66 {
  67     WvConstStringBuffer b(s);
  68     WvString path = wvtcl_getword(b);
  69     WvString wrapper = b.getstr();
  70     IWvListener *l = new WvUnixListener(path, 0777);
  71     if (l && !!wrapper)
  72         l->addwrap(wv::bind(&IWvStream::create, wrapper, _1));
  73     return l;
  74 }
  75
  76 static IWvListener *modelistener(WvStringParm s, IObject *)
  77 {
  78     WvConstStringBuffer b(s);
  79
  80     // strtoul knows how to interpret octal if it starts with '0'
  81     int mode = strtoul(wvtcl_getword(b, WvStringMask(":")), NULL, 0);
  82     if (b.peekch() == ':')
  83         b.get(1);
  84     WvString path = wvtcl_getword(b);
  85     WvString wrapper = b.getstr();
  86     IWvListener *l = new WvUnixListener(path, mode);
  87     if (l && !!wrapper)
  88         l->addwrap(wv::bind(&IWvStream::create, wrapper, _1));
  89     return l;
  90 }
  91
  92 static WvMoniker<IWvListener> lreg("unix", listener);
  93 static WvMoniker<IWvListener> lmodereg("unixmode", modelistener);
  94
  95
  96 WvUnixConn::WvUnixConn(int _fd, const WvUnixAddr &_addr)
  97     : WvFDStream(_fd), addr(_addr)
  98 {
  99     // all is well and we're connected.
 100     set_nonblock(true);
 101     set_close_on_exec(true);
 102 }
 103
 104
 105 WvUnixConn::WvUnixConn(const WvUnixAddr &_addr)
 106     : addr(_addr)
 107 {
 108     setfd(socket(PF_UNIX, SOCK_STREAM, 0));
 109     if (getfd() < 0)
 110     {
 111         seterr(errno);
 112         return;
 113     }
 114
 115     // Make the socket non-blocking and close-on-exec.
 116     fcntl(getfd(), F_SETFD, FD_CLOEXEC);
 117     fcntl(getfd(), F_SETFL, O_RDWR|O_NONBLOCK);
 118
 119     sockaddr *sa = addr.sockaddr();
 120     if (connect(getfd(), sa, addr.sockaddr_len()) < 0)
 121         seterr(errno);
 122     delete sa;
 123
 124     // all is well and we're connected.
 125     set_nonblock(true);
 126     set_close_on_exec(true);
 127 }
 128
 129
 130 WvUnixConn::~WvUnixConn()
 131 {
 132     // we don't want to delete the socket file here; that's a job for the
 133     // listener class.
 134
 135     // close the socket
 136     close();
 137 }
 138
 139
 140 const WvUnixAddr *WvUnixConn::src() const
 141 {
 142     return &addr;
 143 }
 144
 145
 146 WvUnixListener::WvUnixListener(const WvUnixAddr &_addr, int create_mode)
 147         : WvListener(new WvFdStream(socket(PF_UNIX, SOCK_STREAM, 0))),
 148           addr(_addr)
 149 {
 150     WvFdStream *fds = (WvFdStream *)cloned;
 151
 152     mode_t oldmask;
 153     bound_okay = false;
 154
 155     if (getfd() < 0)
 156     {
 157         // error inherited from substream
 158         return;
 159     }
 160
 161     fds->set_close_on_exec(true);
 162     fds->set_nonblock(true);
 163
 164     sockaddr *sa = addr.sockaddr();
 165     size_t salen = addr.sockaddr_len();
 166
 167     if (connect(getfd(), sa, salen) == 0) // successful connect?!
 168         seterr(EADDRINUSE); // someone is using this already!
 169     else
 170     {
 171         // unfortunately we have to change the umask here to make the
 172         // create_mode work, because bind() doesn't take extra arguments
 173         // like open() does. However, we don't actually want to _cancel_
 174         // the effects of umask, only add to them; so the original umask is
 175         // or'ed into ~create_mode.  This way it acts like open().
 176         oldmask = umask(0777); // really just reading the old umask here
 177         umask(oldmask | ((~create_mode) & 0777));
 178
 179         ::unlink(WvString(addr));
 180
 181         if (bind(getfd(), sa, salen) || listen(getfd(), 50))
 182             seterr(errno);
 183         else
 184             bound_okay = true;
 185
 186         umask(oldmask);
 187     }
 188
 189     delete sa;
 190 }
 191
 192
 193 WvUnixListener::~WvUnixListener()
 194 {
 195     close();
 196 }
 197
 198
 199 void WvUnixListener::close()
 200 {
 201     // delete the socket _before_ closing it.  Unix will keep
 202     // existing connections around anyway (if any), but if it's idle, then
 203     // we never have an existing not-in-use socket inode.
 204     if (bound_okay)
 205     {
 206         WvString filename(addr);
 207         ::unlink(filename);
 208     }
 209
 210     WvListener::close();
 211 }
 212
 213
 214 IWvStream *WvUnixListener::accept()
 215 {
 216     struct sockaddr_un saun;
 217     socklen_t len = sizeof(saun);
 218
 219     if (!isok()) return NULL;
 220
 221     int newfd = ::accept(getfd(), (struct sockaddr *)&saun, &len);
 222     if (newfd >= 0)
 223         return wrap(new WvUnixConn(newfd, addr));
 224     else if (errno == EAGAIN || errno == EINTR)
 225         return NULL; // this listener is doing weird stuff
 226     else
 227     {
 228         seterr(errno);
 229         return NULL;
 230     }
 231 }
 232
 233
 234 void WvUnixListener::accept_callback(WvIStreamList *list,
 235                                     wv::function<void(IWvStream*)> cb,
 236                                     IWvStream *_conn)
 237 {
 238     WvStreamClone *conn = new WvStreamClone(_conn);
 239     conn->setcallback(wv::bind(cb, conn));
 240     list->append(conn, true, "WvUnixConn");
 241 }
 242
 243
 244 const WvUnixAddr *WvUnixListener::src() const
 245 {
 246     return &addr;
 247 }
 248