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/*
* Network interface functions for CUPS.
*
* Copyright © 2007-2018 by Apple Inc.
* Copyright © 1997-2006 by Easy Software Products, all rights reserved.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers.
*/
#include "getifaddrs-internal.h"
#ifndef HAVE_GETIFADDRS
/*
* '_cups_getifaddrs()' - Get a list of network interfaces on the system.
*/
int /* O - 0 on success, -1 on error */
_cups_getifaddrs(struct ifaddrs **addrs)/* O - List of interfaces */
{
int sock; /* Socket */
char buffer[65536], /* Buffer for address info */
*bufptr, /* Pointer into buffer */
*bufend; /* End of buffer */
struct ifconf conf; /* Interface configurations */
struct sockaddr addr; /* Address data */
struct ifreq *ifp; /* Interface data */
int ifpsize; /* Size of interface data */
struct ifaddrs *temp; /* Pointer to current interface */
struct ifreq request; /* Interface request */
/*
* Start with an empty list...
*/
if (addrs == NULL)
return (-1);
*addrs = NULL;
/*
* Create a UDP socket to get the interface data...
*/
memset (&addr, 0, sizeof(addr));
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
return (-1);
/*
* Try to get the list of interfaces...
*/
conf.ifc_len = sizeof(buffer);
conf.ifc_buf = buffer;
if (ioctl(sock, SIOCGIFCONF, &conf) < 0)
{
/*
* Couldn't get the list of interfaces...
*/
close(sock);
return (-1);
}
/*
* OK, got the list of interfaces, now lets step through the
* buffer to pull them out...
*/
# ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
# define sockaddr_len(a) ((a)->sa_len)
# else
# define sockaddr_len(a) (sizeof(struct sockaddr))
# endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
for (bufptr = buffer, bufend = buffer + conf.ifc_len;
bufptr < bufend;
bufptr += ifpsize)
{
/*
* Get the current interface information...
*/
ifp = (struct ifreq *)bufptr;
ifpsize = sizeof(ifp->ifr_name) + sockaddr_len(&(ifp->ifr_addr));
if (ifpsize < sizeof(struct ifreq))
ifpsize = sizeof(struct ifreq);
memset(&request, 0, sizeof(request));
memcpy(request.ifr_name, ifp->ifr_name, sizeof(ifp->ifr_name));
/*
* Check the status of the interface...
*/
if (ioctl(sock, SIOCGIFFLAGS, &request) < 0)
continue;
/*
* Allocate memory for a single interface record...
*/
if ((temp = calloc(1, sizeof(struct ifaddrs))) == NULL)
{
/*
* Unable to allocate memory...
*/
close(sock);
return (-1);
}
/*
* Add this record to the front of the list and copy the name, flags,
* and network address...
*/
temp->ifa_next = *addrs;
*addrs = temp;
temp->ifa_name = strdup(ifp->ifr_name);
temp->ifa_flags = request.ifr_flags;
if ((temp->ifa_addr = calloc(1, sockaddr_len(&(ifp->ifr_addr)))) != NULL)
memcpy(temp->ifa_addr, &(ifp->ifr_addr), sockaddr_len(&(ifp->ifr_addr)));
/*
* Try to get the netmask for the interface...
*/
if (!ioctl(sock, SIOCGIFNETMASK, &request))
{
/*
* Got it, make a copy...
*/
if ((temp->ifa_netmask = calloc(1, sizeof(request.ifr_netmask))) != NULL)
memcpy(temp->ifa_netmask, &(request.ifr_netmask),
sizeof(request.ifr_netmask));
}
/*
* Then get the broadcast or point-to-point (destination) address,
* if applicable...
*/
if (temp->ifa_flags & IFF_BROADCAST)
{
/*
* Have a broadcast address, so get it!
*/
if (!ioctl(sock, SIOCGIFBRDADDR, &request))
{
/*
* Got it, make a copy...
*/
if ((temp->ifa_broadaddr =
calloc(1, sizeof(request.ifr_broadaddr))) != NULL)
memcpy(temp->ifa_broadaddr, &(request.ifr_broadaddr),
sizeof(request.ifr_broadaddr));
}
}
else if (temp->ifa_flags & IFF_POINTOPOINT)
{
/*
* Point-to-point interface; grab the remote address...
*/
if (!ioctl(sock, SIOCGIFDSTADDR, &request))
{
temp->ifa_dstaddr = malloc(sizeof(request.ifr_dstaddr));
memcpy(temp->ifa_dstaddr, &(request.ifr_dstaddr),
sizeof(request.ifr_dstaddr));
}
}
}
/*
* OK, we're done with the socket, close it and return 0...
*/
close(sock);
return (0);
}
/*
* '_cups_freeifaddrs()' - Free an interface list...
*/
void
_cups_freeifaddrs(struct ifaddrs *addrs)/* I - Interface list to free */
{
struct ifaddrs *next; /* Next interface in list */
while (addrs != NULL)
{
/*
* Make a copy of the next interface pointer...
*/
next = addrs->ifa_next;
/*
* Free data values as needed...
*/
if (addrs->ifa_name)
{
free(addrs->ifa_name);
addrs->ifa_name = NULL;
}
if (addrs->ifa_addr)
{
free(addrs->ifa_addr);
addrs->ifa_addr = NULL;
}
if (addrs->ifa_netmask)
{
free(addrs->ifa_netmask);
addrs->ifa_netmask = NULL;
}
if (addrs->ifa_dstaddr)
{
free(addrs->ifa_dstaddr);
addrs->ifa_dstaddr = NULL;
}
/*
* Free this node and continue to the next...
*/
free(addrs);
addrs = next;
}
}
#endif /* !HAVE_GETIFADDRS */
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