| 1 |
// sockstream.C -*- C++ -*- socket library |
| 2 |
// Copyright (C) 1992,1993,1994 Gnanasekaran Swaminathan <gs4t@virginia.edu> |
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// |
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// Permission is granted to use at your own risk and distribute this software |
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// in source and binary forms provided the above copyright |
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// notice and this paragraph are preserved on all copies. |
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// This software is provided "as is" with no express or implied warranty. |
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// |
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// Version: 17Oct95 1.10 |
| 10 |
// |
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// You can simultaneously read and write into |
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// a sockbuf just like you can listen and talk |
| 13 |
// through a telephone. Hence, the read and the |
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// write buffers are different. That is, they do not |
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// share the same memory. |
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// |
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// Read: |
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// gptr() points to the start of the get area. |
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// The unread chars are gptr() - egptr(). |
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// base() points to the read buffer |
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// |
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// eback() is set to base() so that pbackfail() |
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// is called only when there is no place to |
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// putback a char. And pbackfail() always returns EOF. |
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// |
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// Write: |
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// pptr() points to the start of the put area |
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// The unflushed chars are pbase() - pptr() |
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// pbase() points to the write buffer. |
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// epptr() points to the end of the write buffer. |
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// |
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// Output is flushed whenever one of the following conditions |
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// holds: |
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// (1) pptr() == epptr() |
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// (2) EOF is written |
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// (3) linebuffered and '\n' is written |
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// |
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// Unbuffered: |
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// Input buffer size is assumed to be of size 1 and output |
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// buffer is of size 0. That is, egptr() <= base()+1 and |
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// epptr() == pbase(). |
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|
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|
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#include <config.h> |
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#include <sockstream.h> |
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|
| 47 |
EXTERN_C_BEGIN |
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#include <sys/time.h> |
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#include <sys/socket.h> |
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#include <unistd.h> |
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#include <errno.h> |
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EXTERN_C_END |
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|
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#ifndef BUFSIZ |
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# define BUFSIZ 1024 |
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#endif |
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|
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#ifdef FD_ZERO |
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# undef FD_ZERO // bzero causes so much trouble to us |
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#endif |
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#define FD_ZERO(p) (memset ((p), 0, sizeof *(p))) |
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|
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void sock_error (const char* classname, const char* msg) |
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{ |
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if (errno) |
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perror (msg); |
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cerr << classname << ' ' << msg << endl; |
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errno = 0; |
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} |
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|
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void sockAddr::error (const char* msg) const |
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{ |
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sock_error ("class sockAddr ", msg); |
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} |
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|
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sockbuf::sockbuf (int soc) |
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: rep (new sockcnt (soc, 1)), |
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stmo (-1), rtmo (-1) |
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{ |
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#ifdef _S_NOLIBGXX |
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xflags (0); |
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#endif |
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xsetflags (_S_LINE_BUF); |
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} |
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|
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sockbuf::sockbuf (int domain, sockbuf::type st, int proto) |
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: rep (0), stmo (-1), rtmo (-1) |
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{ |
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int soc = ::socket (domain, st, proto); |
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rep = new sockcnt (soc, 1); |
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#ifdef _S_NOLIBGXX |
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xflags (0); |
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#endif |
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if (rep->sock == -1) perror ("sockbuf::sockbuf"); |
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xsetflags (_S_LINE_BUF); |
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} |
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|
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sockbuf::sockbuf (const sockbuf& sb) |
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: rep (sb.rep), stmo (sb.stmo), rtmo (sb.rtmo) |
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{ |
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#ifdef _S_NOLIBGXX |
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xflags (0); |
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#endif |
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rep->cnt++; |
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xsetflags (_S_LINE_BUF); |
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} |
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|
| 108 |
sockbuf& sockbuf::operator = (const sockbuf& sb) |
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{ |
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if (this != &sb && rep != sb.rep && rep->sock != sb.rep->sock) { |
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this->sockbuf::~sockbuf(); |
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rep = sb.rep; stmo = sb.stmo; rtmo = sb.rtmo; |
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rep->cnt++; |
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#ifdef _S_NOLIBGXX |
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xflags (sb.xflags ()); |
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#else |
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// xflags () is a non-const member function in libg++. |
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xflags (((sockbuf&)sb).xflags ()); |
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#endif |
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} |
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return *this; |
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} |
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|
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sockbuf::~sockbuf () |
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{ |
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overflow (EOF); |
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if (rep->cnt == 1 && !(xflags () & _S_DELETE_DONT_CLOSE)) close (); |
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delete [] base (); |
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if (--rep->cnt == 0) delete rep; |
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} |
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|
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sockbuf* sockbuf::open (type, int) |
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{ |
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return 0; |
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} |
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|
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sockbuf* sockbuf::close() |
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{ |
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if (rep->sock >= 0) { |
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if (::close (rep->sock) == -1) return this; |
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rep->sock = -1; |
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} |
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return 0; |
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} |
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|
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_G_ssize_t sockbuf::sys_read (char* buf, _G_ssize_t len) |
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// return EOF on eof, 0 on timeout, and # of chars read on success |
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{ |
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return read (buf, len); |
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} |
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|
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_G_ssize_t sockbuf::sys_write (const void* buf, long len) |
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// return written_length; < len indicates error |
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{ |
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return write (buf, (int) len); |
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} |
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|
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int sockbuf::flush_output() |
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// return 0 when there is nothing to flush or when the flush is a success |
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// return EOF when it could not flush |
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{ |
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if (pptr () <= pbase ()) return 0; |
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if (!(xflags () & _S_NO_WRITES)) { |
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int wlen = pptr () - pbase (); |
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int wval = sys_write (pbase (), wlen); |
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int status = (wval == wlen)? 0: EOF; |
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if (unbuffered()) setp (pbase (), pbase ()); |
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else setp (pbase (), pbase () + BUFSIZ); |
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return status; |
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} |
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return EOF; |
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} |
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|
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int sockbuf::sync () |
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{ |
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return flush_output (); |
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} |
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|
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int sockbuf::doallocate () |
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// return 1 on allocation and 0 if there is no need |
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{ |
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if (!base ()) { |
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char* buf = new char[2*BUFSIZ]; |
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setb (buf, buf+BUFSIZ, 0); |
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setg (buf, buf, buf); |
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|
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buf += BUFSIZ; |
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setp (buf, buf+BUFSIZ); |
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return 1; |
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} |
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return 0; |
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} |
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|
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int sockbuf::underflow () |
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{ |
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if (xflags () & _S_NO_READS) return EOF; |
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|
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if (gptr () < egptr ()) return *(unsigned char*)gptr (); |
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|
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if (base () == 0 && doallocate () == 0) return EOF; |
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|
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int bufsz = unbuffered () ? 1: BUFSIZ; |
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int rval = sys_read (base (), bufsz); |
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if (rval == EOF) { |
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xsetflags (_S_EOF_SEEN); |
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return EOF; |
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}else if (rval == 0) |
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return EOF; |
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setg (eback (), base (), base () + rval); |
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return *(unsigned char*)gptr (); |
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} |
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|
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int sockbuf::overflow (int c) |
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// if c == EOF, return flush_output(); |
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// if c == '\n' and linebuffered, insert c and |
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// return (flush_output()==EOF)? EOF: c; |
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// otherwise insert c into the buffer and return c |
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{ |
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if (c == EOF) return flush_output (); |
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|
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if (xflags () & _S_NO_WRITES) return EOF; |
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|
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if (pbase () == 0 && doallocate () == 0) return EOF; |
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|
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if (pptr () >= epptr() && flush_output () == EOF) |
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return EOF; |
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|
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xput_char (c); |
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if ((unbuffered () || linebuffered () && c == '\n' || pptr () >= epptr ()) |
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&& flush_output () == EOF) |
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return EOF; |
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|
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return c; |
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} |
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|
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int sockbuf::xsputn (const char* s, int n) |
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{ |
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if (n <= 0) return 0; |
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const unsigned char* p = (const unsigned char*)s; |
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|
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for (int i=0; i<n; i++, p++) { |
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if (*p == '\n') { |
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if (overflow (*p) == EOF) return i; |
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} else |
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if (sputc (*p) == EOF) return i; |
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} |
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return n; |
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} |
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|
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int sockbuf::bind (sockAddr& sa) |
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{ |
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if (::bind (rep->sock, sa.addr (), sa.size ()) == -1) { |
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// error ("sockbuf::bind"); |
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return errno; |
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} |
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return 0; |
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} |
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|
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int sockbuf::connect (sockAddr& sa) |
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{ |
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if (::connect(rep->sock, sa.addr (), sa.size()) == -1) { |
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// error ("sockbuf::connect"); |
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return errno; |
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} |
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return 0; |
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} |
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|
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void sockbuf::listen (int num) |
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{ |
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if (::listen (rep->sock, num) == -1) |
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error ("sockbuf::listen"); |
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} |
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|
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sockbuf sockbuf::accept (sockAddr& sa) |
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{ |
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int len = sa.size (); |
| 277 |
int soc = -1; |
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while ((soc = ::accept (rep->sock, sa.addr (), &len)) == -1 |
| 279 |
&& errno == EINTR) |
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errno = 0; |
| 281 |
if (soc == -1) |
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error ("sockbuf::accept"); |
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return soc; |
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} |
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|
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sockbuf sockbuf::accept () |
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{ |
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int soc = -1; |
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while ((soc = ::accept (rep->sock, 0, 0)) == -1 |
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&& errno == EINTR) |
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errno = 0; |
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if (soc == -1) |
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error ("sockbuf::accept"); |
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return soc; |
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} |
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|
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int sockbuf::read (void* buf, int len) |
| 298 |
{ |
| 299 |
if (rtmo != -1 && is_readready (rtmo)==0) return 0; |
| 300 |
|
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int rval; |
| 302 |
if ((rval = ::read (rep->sock, (char*) buf, len)) == -1) |
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error("sockbuf::read"); |
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return (rval==0) ? EOF: rval; |
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} |
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|
| 307 |
int sockbuf::recv (void* buf, int len, int msgf) |
| 308 |
{ |
| 309 |
if (rtmo != -1 && is_readready (rtmo)==0) return 0; |
| 310 |
|
| 311 |
int rval; |
| 312 |
if ((rval = ::recv (rep->sock, (char*) buf, len, msgf)) == -1) |
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error ("sockbuf::recv"); |
| 314 |
return (rval==0) ? EOF: rval; |
| 315 |
} |
| 316 |
|
| 317 |
int sockbuf::recvfrom (sockAddr& sa, void* buf, int len, int msgf) |
| 318 |
{ |
| 319 |
if (rtmo != -1 && is_readready (rtmo)==0) return 0; |
| 320 |
|
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int rval; |
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int sa_len = sa.size (); |
| 323 |
|
| 324 |
if ((rval = ::recvfrom (rep->sock, (char*) buf, len, |
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msgf, sa.addr (), &sa_len)) == -1) |
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error ("sockbuf::recvfrom"); |
| 327 |
return (rval==0) ? EOF: rval; |
| 328 |
} |
| 329 |
|
| 330 |
int sockbuf::write(const void* buf, int len) |
| 331 |
{ |
| 332 |
if (stmo != -1 && is_writeready (stmo)==0) return 0; |
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|
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int wlen=0; |
| 335 |
while(len>0) { |
| 336 |
int wval; |
| 337 |
if ((wval = ::write (rep->sock, (char*) buf, len)) == -1) { |
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error ("sockbuf::write"); |
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return wval; |
| 340 |
} |
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len -= wval; |
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wlen += wval; |
| 343 |
} |
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return wlen; // == len if every thing is all right |
| 345 |
} |
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|
| 347 |
int sockbuf::send (const void* buf, int len, int msgf) |
| 348 |
{ |
| 349 |
if (stmo != -1 && is_writeready (stmo)==0) return 0; |
| 350 |
|
| 351 |
int wlen=0; |
| 352 |
while(len>0) { |
| 353 |
int wval; |
| 354 |
if ((wval = ::send (rep->sock, (char*) buf, len, msgf)) == -1) { |
| 355 |
error ("sockbuf::send"); |
| 356 |
return wval; |
| 357 |
} |
| 358 |
len -= wval; |
| 359 |
wlen += wval; |
| 360 |
} |
| 361 |
return wlen; |
| 362 |
} |
| 363 |
|
| 364 |
int sockbuf::sendto (sockAddr& sa, const void* buf, int len, int msgf) |
| 365 |
{ |
| 366 |
if (stmo != -1 && is_writeready (stmo)==0) return 0; |
| 367 |
|
| 368 |
int wlen=0; |
| 369 |
while(len>0) { |
| 370 |
int wval; |
| 371 |
if ((wval = ::sendto (rep->sock, (char*) buf, len, |
| 372 |
msgf, sa.addr (), sa.size())) == -1) { |
| 373 |
error ("sockbuf::sendto"); |
| 374 |
return wval; |
| 375 |
} |
| 376 |
len -= wval; |
| 377 |
wlen += wval; |
| 378 |
} |
| 379 |
return wlen; |
| 380 |
} |
| 381 |
|
| 382 |
#ifndef __linux__ |
| 383 |
// linux does not have sendmsg or recvmsg |
| 384 |
|
| 385 |
int sockbuf::recvmsg (msghdr* msg, int msgf) |
| 386 |
{ |
| 387 |
if (rtmo != -1 && is_readready (rtmo)==0) return 0; |
| 388 |
|
| 389 |
int rval; |
| 390 |
if ((rval = ::recvmsg(rep->sock, msg, msgf)) == -1) |
| 391 |
error ("sockbuf::recvmsg"); |
| 392 |
return (rval==0)? EOF: rval; |
| 393 |
} |
| 394 |
|
| 395 |
int sockbuf::sendmsg (msghdr* msg, int msgf) |
| 396 |
{ |
| 397 |
if (stmo != -1 && is_writeready (stmo)==0) return 0; |
| 398 |
|
| 399 |
int wval; |
| 400 |
if ((wval = ::sendmsg (rep->sock, msg, msgf)) == -1) |
| 401 |
error("sockbuf::sendmsg"); |
| 402 |
return wval; |
| 403 |
} |
| 404 |
#endif //!__linux__ |
| 405 |
|
| 406 |
int sockbuf::sendtimeout (int wp) |
| 407 |
{ |
| 408 |
int oldstmo = stmo; |
| 409 |
stmo = (wp < 0) ? -1: wp; |
| 410 |
return oldstmo; |
| 411 |
} |
| 412 |
|
| 413 |
int sockbuf::recvtimeout (int wp) |
| 414 |
{ |
| 415 |
int oldrtmo = rtmo; |
| 416 |
rtmo = (wp < 0) ? -1: wp; |
| 417 |
return oldrtmo; |
| 418 |
} |
| 419 |
|
| 420 |
int sockbuf::is_readready (int wp_sec, int wp_usec) const |
| 421 |
{ |
| 422 |
fd_set fds; |
| 423 |
FD_ZERO (&fds); |
| 424 |
FD_SET (rep->sock, &fds); |
| 425 |
|
| 426 |
timeval tv; |
| 427 |
tv.tv_sec = wp_sec; |
| 428 |
tv.tv_usec = wp_usec; |
| 429 |
|
| 430 |
int ret = select (rep->sock+1, &fds, 0, 0, (wp_sec == -1) ? 0: &tv); |
| 431 |
if (ret == -1) { |
| 432 |
error ("sockbuf::readready"); |
| 433 |
return 0; |
| 434 |
} |
| 435 |
return ret; |
| 436 |
} |
| 437 |
|
| 438 |
int sockbuf::is_writeready (int wp_sec, int wp_usec) const |
| 439 |
{ |
| 440 |
fd_set fds; |
| 441 |
FD_ZERO (&fds); |
| 442 |
FD_SET (rep->sock, &fds); |
| 443 |
|
| 444 |
timeval tv; |
| 445 |
tv.tv_sec = wp_sec; |
| 446 |
tv.tv_usec = wp_usec; |
| 447 |
|
| 448 |
int ret = select (rep->sock+1, 0, &fds, 0, (wp_sec == -1) ? 0: &tv); |
| 449 |
if (ret == -1) { |
| 450 |
error ("Select::operator ()"); |
| 451 |
return 0; |
| 452 |
} |
| 453 |
return ret; |
| 454 |
} |
| 455 |
|
| 456 |
int sockbuf::is_exceptionpending (int wp_sec, int wp_usec) const |
| 457 |
{ |
| 458 |
fd_set fds; |
| 459 |
FD_ZERO (&fds); |
| 460 |
FD_SET (rep->sock, &fds); |
| 461 |
|
| 462 |
timeval tv; |
| 463 |
tv.tv_sec = wp_sec; |
| 464 |
tv.tv_usec = wp_usec; |
| 465 |
|
| 466 |
int ret = select (rep->sock+1, 0, 0, &fds, (wp_sec == -1) ? 0: &tv); |
| 467 |
if (ret == -1) { |
| 468 |
error ("Select::operator ()"); |
| 469 |
return 0; |
| 470 |
} |
| 471 |
return ret; |
| 472 |
} |
| 473 |
|
| 474 |
void sockbuf::shutdown (shuthow sh) |
| 475 |
{ |
| 476 |
switch (sh) { |
| 477 |
case shut_read: |
| 478 |
xsetflags(_S_NO_READS); |
| 479 |
break; |
| 480 |
case shut_write: |
| 481 |
xsetflags(_S_NO_WRITES); |
| 482 |
break; |
| 483 |
case shut_readwrite: |
| 484 |
xsetflags(_S_NO_READS|_S_NO_WRITES); |
| 485 |
break; |
| 486 |
} |
| 487 |
if (::shutdown(rep->sock, sh) == -1) |
| 488 |
error("sockbuf::shutdown"); |
| 489 |
} |
| 490 |
|
| 491 |
int sockbuf::getopt (option op, void* buf, int len, level l) const |
| 492 |
{ |
| 493 |
int rlen = len; |
| 494 |
if (::getsockopt (rep->sock, l, op, (char*) buf, &rlen) == -1) |
| 495 |
perror ("sockbuf::getopt"); |
| 496 |
return rlen; |
| 497 |
} |
| 498 |
|
| 499 |
void sockbuf::setopt (option op, void* buf, int len, level l) const |
| 500 |
{ |
| 501 |
if (::setsockopt (rep->sock, l, op, (char*) buf, len) == -1) |
| 502 |
perror ("sockbuf::setopt"); |
| 503 |
} |
| 504 |
|
| 505 |
sockbuf::type sockbuf::gettype () const |
| 506 |
{ |
| 507 |
int ty=0; |
| 508 |
getopt (so_type, &ty, sizeof (ty)); |
| 509 |
return sockbuf::type(ty); |
| 510 |
} |
| 511 |
|
| 512 |
int sockbuf::clearerror () const |
| 513 |
{ |
| 514 |
int err=0; |
| 515 |
getopt (so_error, &err, sizeof (err)); |
| 516 |
return err; |
| 517 |
} |
| 518 |
|
| 519 |
int sockbuf::debug (int opt) const |
| 520 |
{ |
| 521 |
int old=0; |
| 522 |
getopt (so_debug, &old, sizeof (old)); |
| 523 |
if (opt != -1) |
| 524 |
setopt (so_debug, &opt, sizeof (opt)); |
| 525 |
return old; |
| 526 |
} |
| 527 |
|
| 528 |
int sockbuf::reuseaddr (int opt) const |
| 529 |
{ |
| 530 |
int old=0; |
| 531 |
getopt (so_reuseaddr, &old, sizeof (old)); |
| 532 |
if (opt != -1) |
| 533 |
setopt (so_reuseaddr, &opt, sizeof (opt)); |
| 534 |
return old; |
| 535 |
} |
| 536 |
|
| 537 |
int sockbuf::keepalive (int opt) const |
| 538 |
{ |
| 539 |
int old=0; |
| 540 |
getopt (so_keepalive, &old, sizeof (old)); |
| 541 |
if (opt != -1) |
| 542 |
setopt (so_keepalive, &opt, sizeof (opt)); |
| 543 |
return old; |
| 544 |
} |
| 545 |
|
| 546 |
int sockbuf::dontroute (int opt) const |
| 547 |
{ |
| 548 |
int old=0; |
| 549 |
getopt (so_dontroute, &old, sizeof (old)); |
| 550 |
if (opt != -1) |
| 551 |
setopt (so_dontroute, &opt, sizeof (opt)); |
| 552 |
return old; |
| 553 |
} |
| 554 |
|
| 555 |
int sockbuf::broadcast (int opt) const |
| 556 |
{ |
| 557 |
int old=0; |
| 558 |
getopt (so_broadcast, &old, sizeof (old)); |
| 559 |
if (opt != -1) |
| 560 |
setopt (so_broadcast, &opt, sizeof (opt)); |
| 561 |
return old; |
| 562 |
} |
| 563 |
|
| 564 |
int sockbuf::oobinline (int opt) const |
| 565 |
{ |
| 566 |
int old=0; |
| 567 |
getopt (so_oobinline, &old, sizeof (old)); |
| 568 |
if (opt != -1) |
| 569 |
setopt (so_oobinline, &opt, sizeof (opt)); |
| 570 |
return old; |
| 571 |
} |
| 572 |
|
| 573 |
int sockbuf::linger (int opt) const |
| 574 |
{ |
| 575 |
socklinger old (0, 0); |
| 576 |
getopt (so_linger, &old, sizeof (old)); |
| 577 |
if (opt > 0) { |
| 578 |
socklinger nw (1, opt); |
| 579 |
setopt (so_linger, &nw, sizeof (nw)); |
| 580 |
}else if (opt == 0) { |
| 581 |
socklinger nw (0, old.l_linger); |
| 582 |
setopt (so_linger, &nw, sizeof (nw)); |
| 583 |
} |
| 584 |
return old.l_onoff ? old.l_linger: -1; |
| 585 |
} |
| 586 |
|
| 587 |
int sockbuf::sendbufsz (int sz) const |
| 588 |
{ |
| 589 |
int old=0; |
| 590 |
getopt (so_sndbuf, &old, sizeof (old)); |
| 591 |
if (sz >= 0) |
| 592 |
setopt (so_sndbuf, &sz, sizeof (sz)); |
| 593 |
return old; |
| 594 |
} |
| 595 |
|
| 596 |
int sockbuf::recvbufsz (int sz) const |
| 597 |
{ |
| 598 |
int old=0; |
| 599 |
getopt (so_rcvbuf, &old, sizeof (old)); |
| 600 |
if (sz >= 0) |
| 601 |
setopt (so_rcvbuf, &sz, sizeof (sz)); |
| 602 |
return old; |
| 603 |
} |
| 604 |
|
| 605 |
void sockbuf::error (const char* msg) const |
| 606 |
{ |
| 607 |
sock_error ("class sockbuf: ", msg); |
| 608 |
} |
| 609 |
|
| 610 |
isockstream::~isockstream () |
| 611 |
{ |
| 612 |
delete ios::rdbuf (); |
| 613 |
init (0); |
| 614 |
} |
| 615 |
|
| 616 |
void isockstream::error (const char* msg) const |
| 617 |
{ |
| 618 |
sock_error ("class isockstream: ", msg); |
| 619 |
} |
| 620 |
|
| 621 |
osockstream::~osockstream () |
| 622 |
{ |
| 623 |
delete ios::rdbuf (); |
| 624 |
init (0); |
| 625 |
} |
| 626 |
|
| 627 |
void osockstream::error (const char* msg) const |
| 628 |
{ |
| 629 |
sock_error ("class osockstream: ", msg); |
| 630 |
} |
| 631 |
|
| 632 |
iosockstream::~iosockstream () |
| 633 |
{ |
| 634 |
delete ios::rdbuf (); |
| 635 |
init (0); |
| 636 |
} |
| 637 |
|
| 638 |
void iosockstream::error (const char* msg) const |
| 639 |
{ |
| 640 |
sock_error ("class iosockstream: ", msg); |
| 641 |
} |
| 642 |
|
