Re: getifaddrs

["H . J . Lu" <hjl at lucon dot org>]

I don't think any glibc supports it. But it seems that someone is
working on it for ipv6:

http://www.linux-ipv6.org/
http://oss.sgi.com/projects/netdev/mail/netdev/msg00431.html
http://www2.linux-ipv6.org/ml/usagi-users/msg00416.html


H.J.
---
On Mon, Jun 18, 2001 at 11:19:43AM -0700, Ron Guilmette wrote:
> 
> Can you tell me if the following function from FreeBSD is available in
> Linix libc, and if so, which version of Linux libc it first appeared in?
> 
> 
> ===========================================================================
> GETIFADDRS(3)	       FreeBSD Library Functions Manual 	 GETIFADDRS(3)
> 
> NNAAMMEE
>      ggeettiiffaaddddrrss - get interface addresses
> 
> SSYYNNOOPPSSIISS
>      ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>
>      ##iinncclluuddee <<ssyyss//ssoocckkeett..hh>>
>      ##iinncclluuddee <<iiffaaddddrrss..hh>>
> 
>      _i_n_t
>      ggeettiiffaaddddrrss(_s_t_r_u_c_t _i_f_a_d_d_r_s _*_*_i_f_a_p)
> 
>      _v_o_i_d
>      ffrreeeeiiffaaddddrrss(_s_t_r_u_c_t _i_f_a_d_d_r_s _*_i_f_p)
> 
> DDEESSCCRRIIPPTTIIOONN
>      The ggeettiiffaaddddrrss() function stores a reference to a linked list of the net-
>      work interfaces on the local machine in the memory referenced by _i_f_a_p.
>      The list consists of iiffaaddddrrss structures, as defined in the include file
>      <_i_f_a_d_d_r_s_._h>. The iiffaaddddrrss structure contains at least the following en-
>      tries:
> 
> 	 struct ifaddrs   *ifa_next;	     /* Pointer to next struct */
> 	 char		  *ifa_name;	     /* Interface name */
> 	 u_int		   ifa_flags;	     /* Interface flags */
> 	 struct sockaddr  *ifa_addr;	     /* Interface address */
> 	 struct sockaddr  *ifa_netmask;      /* Interface netmask */
> 	 struct sockaddr  *ifa_broadaddr;    /* Interface broadcast address */
> 	 struct sockaddr  *ifa_dstaddr;      /* P2P interface destination */
> 	 void		  *ifa_data;	     /* Address specific data */
> 
>      The ifa_next field contains a pointer to the next structure on the list.
>      This field is NULL in last structure on the list.
> 
>      The ifa_name field contains the interface name.
> 
>      The ifa_flags field contains the interface flags, as set by ifconfig(8)
>      utility.
> 
>      The ifa_addr field references either the address of the interface or the
>      link level address of the interface, if one exists, otherwise it is NULL.
>      (The sa_family field of the ifa_addr field should be consulted to deter-
>      mine the format of the ifa_addr address.)
> 
>      The ifa_netmask field references the netmask associated with ifa_addr, if
>      one is set, otherwise it is NULL.
> 
>      The ifa_broadaddr field, which should only be referenced for non-P2P in-
>      terfaces, references the broadcast address associated with ifa_addr, if
>      one exists, otherwise it is NULL.
> 
>      The ifa_dstaddr field references the destination address on a P2P inter-
>      face, if one exists, otherwise it is NULL.
> 
>      The ifa_data field references address family specific data.  For AF_LINK
>      addresses it contains a pointer to the _s_t_r_u_c_t _i_f___d_a_t_a (as defined in
>      include file <_n_e_t_/_i_f_._h>) which contains various interface attributes and
>      statistics.  For all other address families, it contains a pointer to the
>      _s_t_r_u_c_t _i_f_a___d_a_t_a (as defined in include file <_n_e_t_/_i_f_._h>) which contains
>      per-address interface statistics.
> 
>      The data returned by ggeettiiffaaddddrrss() is dynamically allocated and should be
>      freed using ffrreeeeiiffaaddddrrss() when no longer needed.
> 
> RREETTUURRNN VVAALLUUEESS
>      Upon successful completion, a value of 0 is returned.  Otherwise, a value
>      of -1 is returned and _e_r_r_n_o is set to indicate the error.
> 
> EERRRROORRSS
>      The ggeettiiffaaddddrrss() may fail and set _e_r_r_n_o for any of the errors specified
>      for the library routines ioctl(2),  socket(2),  malloc(3) or sysctl(3).
> 
> BBUUGGSS
>      If both <_n_e_t_/_i_f_._h> and <_i_f_a_d_d_r_s_._h> are being included, <_n_e_t_/_i_f_._h> _m_u_s_t be
>      included before <_i_f_a_d_d_r_s_._h>.
> 
> SSEEEE AALLSSOO
>      ioctl(2),	socket(2),  sysctl(3),	networking(4),	ifconfig(8)
> 
> HHIISSTTOORRYY
>      The ggeettiiffaaddddrrss implementation first appeared in BSDI BSD/OS.
> 
> 				 June 18, 2001				     2