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CentOS 7.0 - man page for ipsec_portof (centos section 3)

IPSEC_PORTOF(3) 			       Library Functions Manual 			      IPSEC_PORTOF(3)

NAME
ipsec_portof, ipsec_setportof, ipsec_sockaddrof, ipsec_sockaddrlenof - get port field of an ip_address, set port field of an ip_address, get pointer to internal sockaddr of an ip_address, get length of internal sock- addr of an ip_address
SYNOPSIS
#include <libreswan.h> int portof(const ip_address *src); void setportof(int port, ip_address *dst); struct sockaddr *sockaddrof(ip_address *src); size_t sockaddrlenof(const ip_address *src);
DESCRIPTION
The <libreswan.h> internal type ip_address contains one of the sockaddr types internally. Reliance on this feature is discouraged, but it may occasionally be necessary. These functions provide low-level tools for this purpose. Portof and setportof respectively read and write the port-number field of the internal sockaddr. The values are in network byte order. Sockaddrof returns a pointer to the internal sockaddr, for passing to other functions. Sockaddrlenof reports the size of the internal sockaddr, for use in storage allocation.
SEE ALSO
inet(3), ipsec_initaddr(3)
DIAGNOSTICS
Portof returns -1, sockaddrof returns NULL, and sockaddrlenof returns 0 if an unknown address family is found within the ip_address.
HISTORY
Written for the FreeS/WAN project by Henry Spencer.
BUGS
These functions all depend on low-level details of the ip_address type, which are in principle subject to change. Avoid using them unless really necessary. 8 Sept 2000 IPSEC_PORTOF(3)


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