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If port=0, UDP should select a port number

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1625 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-03-19 00:18:21 +00:00
parent 8f2bf0bf97
commit 8a850fb963
1 changed files with 73 additions and 32 deletions
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101
net/uip/uip_udpconn.c
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@ -1,7 +1,7 @@
/****************************************************************************
* net/uip/uip_udpconn.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Large parts of this file were leveraged from uIP logic:
@ -137,6 +137,62 @@ static struct uip_udp_conn *uip_find_conn(uint16 portno)
return NULL;
}
/****************************************************************************
* Name: uip_selectport()
*
* Description:
* Select an unused port number.
*
* NOTE that in prinicple this function could fail if there is no available
* port number. There is no check for that case and it would actually
* in an infinite loop if that were the case. In this simple, small UDP
* implementation, it is reasonable to assume that that error cannot happen
* and that a port number will always be available.
*
* Input Parameters:
* None
*
* Return:
* Next available port number
*
****************************************************************************/
static uint16 uip_selectport(void)
{
uint16 portno;
/* Find an unused local port number. Loop until we find a valid
* listen port number that is not being used by any other connection.
*/
irqstate_t flags = irqsave();
do
{
/* Guess that the next available port number will be the one after
* the last port number assigned.
*/
++g_last_udp_port;
/* Make sure that the port number is within range */
if (g_last_udp_port >= 32000)
{
g_last_udp_port = 4096;
}
}
while (uip_find_conn(htons(g_last_udp_port)));
/* Initialize and return the connection structure, bind it to the
* port number
*/
portno = g_last_udp_port;
irqrestore(flags);
return portno;
}
/****************************************************************************
* Public Functions
****************************************************************************/
@ -311,9 +367,16 @@ int uip_udpbind(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
int ret = -EADDRINUSE;
irqstate_t flags;
/* Never set lport to zero! */
/* Is the user requesting to bind to any port? */
if (addr->sin_port)
if (!addr->sin_port)
{
/* Yes.. Find an unused local port number */
conn->lport = htons(uip_selectport());
ret = OK;
}
else
{
/* Interrupts must be disabled while access the UDP connection list */
@ -331,7 +394,6 @@ int uip_udpbind(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
irqrestore(flags);
}
return ret;
}
@ -361,39 +423,18 @@ int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in6 *addr)
int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
#endif
{
/* Has this structure already been bound to a local port? */
/* Has this address already been bound to a local port (lport)? */
if (!conn->lport)
{
/* No..Find an unused local port number. Loop until we find a valid
* listen port number that is not being used by any other connection.
/* No.. Find an unused local port number and bind it to the
* connection structure.
*/
irqstate_t flags = irqsave();
do
{
/* Guess that the next available port number will be the one after
* the last port number assigned.
*/
++g_last_udp_port;
/* Make sure that the port number is within range */
if (g_last_udp_port >= 32000)
{
g_last_udp_port = 4096;
conn->lport = htons(uip_selectport());
}
}
while (uip_find_conn(htons(g_last_udp_port)));
/* Initialize and return the connection structure, bind it to the
* port number
*/
conn->lport = HTONS(g_last_udp_port);
irqrestore(flags);
}
/* Is there a remote port (rport) */
if (addr)
{