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101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* Copyright (c) 1987 by Sun Microsystems, Inc.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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/*
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* Bind a socket to a privileged IP port
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*/
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int
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bindresvport (int sd, struct sockaddr_in *sin)
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{
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static short port;
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struct sockaddr_in myaddr;
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int i;
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#define STARTPORT 600
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#define LOWPORT 512
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#define ENDPORT (IPPORT_RESERVED - 1)
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#define NPORTS (ENDPORT - STARTPORT + 1)
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static short startport = STARTPORT;
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if (sin == (struct sockaddr_in *) 0)
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{
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sin = &myaddr;
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__bzero (sin, sizeof (*sin));
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sin->sin_family = AF_INET;
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}
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else if (sin->sin_family != AF_INET)
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{
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__set_errno (EPFNOSUPPORT);
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return -1;
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}
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if (port == 0)
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{
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port = (__getpid () % NPORTS) + STARTPORT;
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}
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/* Initialize to make gcc happy. */
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int res = -1;
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int nports = ENDPORT - startport + 1;
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int endport = ENDPORT;
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again:
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for (i = 0; i < nports; ++i)
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{
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sin->sin_port = htons (port++);
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if (port > endport)
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port = startport;
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res = __bind (sd, sin, sizeof (struct sockaddr_in));
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if (res >= 0 || errno != EADDRINUSE)
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break;
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}
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if (i == nports && startport != LOWPORT)
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{
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startport = LOWPORT;
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endport = STARTPORT - 1;
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nports = STARTPORT - LOWPORT;
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port = LOWPORT + port % (STARTPORT - LOWPORT);
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goto again;
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}
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return res;
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}
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libc_hidden_def (bindresvport)
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