2 * "$Id: getifaddrs.c 9042 2010-03-24 00:45:34Z mike $"
4 * Network interface functions for CUPS.
6 * Copyright 2007-2010 by Apple Inc.
7 * Copyright 1997-2006 by Easy Software Products, all rights reserved.
9 * These coded instructions, statements, and computer programs are the
10 * property of Apple Inc. and are protected by Federal copyright
11 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
12 * "LICENSE" which should have been included with this file. If this
13 * file is missing or damaged, see the license at "http://www.cups.org/".
17 * _cups_getifaddrs() - Get a list of network interfaces on the system.
18 * _cups_freeifaddrs() - Free an interface list...
22 * Include necessary headers.
25 #include "http-private.h"
28 #ifndef HAVE_GETIFADDRS
30 * '_cups_getifaddrs()' - Get a list of network interfaces on the system.
33 int /* O - 0 on success, -1 on error */
34 _cups_getifaddrs(struct ifaddrs **addrs)/* O - List of interfaces */
36 int sock; /* Socket */
37 char buffer[65536], /* Buffer for address info */
38 *bufptr, /* Pointer into buffer */
39 *bufend; /* End of buffer */
40 struct ifconf conf; /* Interface configurations */
41 struct sockaddr addr; /* Address data */
42 struct ifreq *ifp; /* Interface data */
43 int ifpsize; /* Size of interface data */
44 struct ifaddrs *temp; /* Pointer to current interface */
45 struct ifreq request; /* Interface request */
49 * Start with an empty list...
58 * Create a UDP socket to get the interface data...
61 memset (&addr, 0, sizeof(addr));
62 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
66 * Try to get the list of interfaces...
69 conf.ifc_len = sizeof(buffer);
70 conf.ifc_buf = buffer;
72 if (ioctl(sock, SIOCGIFCONF, &conf) < 0)
75 * Couldn't get the list of interfaces...
83 * OK, got the list of interfaces, now lets step through the
84 * buffer to pull them out...
87 # ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
88 # define sockaddr_len(a) ((a)->sa_len)
90 # define sockaddr_len(a) (sizeof(struct sockaddr))
91 # endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
93 for (bufptr = buffer, bufend = buffer + conf.ifc_len;
98 * Get the current interface information...
101 ifp = (struct ifreq *)bufptr;
102 ifpsize = sizeof(ifp->ifr_name) + sockaddr_len(&(ifp->ifr_addr));
104 if (ifpsize < sizeof(struct ifreq))
105 ifpsize = sizeof(struct ifreq);
107 memset(&request, 0, sizeof(request));
108 memcpy(request.ifr_name, ifp->ifr_name, sizeof(ifp->ifr_name));
111 * Check the status of the interface...
114 if (ioctl(sock, SIOCGIFFLAGS, &request) < 0)
118 * Allocate memory for a single interface record...
121 if ((temp = calloc(1, sizeof(struct ifaddrs))) == NULL)
124 * Unable to allocate memory...
132 * Add this record to the front of the list and copy the name, flags,
133 * and network address...
136 temp->ifa_next = *addrs;
138 temp->ifa_name = strdup(ifp->ifr_name);
139 temp->ifa_flags = request.ifr_flags;
140 if ((temp->ifa_addr = calloc(1, sockaddr_len(&(ifp->ifr_addr)))) != NULL)
141 memcpy(temp->ifa_addr, &(ifp->ifr_addr), sockaddr_len(&(ifp->ifr_addr)));
144 * Try to get the netmask for the interface...
147 if (!ioctl(sock, SIOCGIFNETMASK, &request))
150 * Got it, make a copy...
153 if ((temp->ifa_netmask = calloc(1, sizeof(request.ifr_netmask))) != NULL)
154 memcpy(temp->ifa_netmask, &(request.ifr_netmask),
155 sizeof(request.ifr_netmask));
159 * Then get the broadcast or point-to-point (destination) address,
163 if (temp->ifa_flags & IFF_BROADCAST)
166 * Have a broadcast address, so get it!
169 if (!ioctl(sock, SIOCGIFBRDADDR, &request))
172 * Got it, make a copy...
175 if ((temp->ifa_broadaddr =
176 calloc(1, sizeof(request.ifr_broadaddr))) != NULL)
177 memcpy(temp->ifa_broadaddr, &(request.ifr_broadaddr),
178 sizeof(request.ifr_broadaddr));
181 else if (temp->ifa_flags & IFF_POINTOPOINT)
184 * Point-to-point interface; grab the remote address...
187 if (!ioctl(sock, SIOCGIFDSTADDR, &request))
189 temp->ifa_dstaddr = malloc(sizeof(request.ifr_dstaddr));
190 memcpy(temp->ifa_dstaddr, &(request.ifr_dstaddr),
191 sizeof(request.ifr_dstaddr));
197 * OK, we're done with the socket, close it and return 0...
207 * '_cups_freeifaddrs()' - Free an interface list...
211 _cups_freeifaddrs(struct ifaddrs *addrs)/* I - Interface list to free */
213 struct ifaddrs *next; /* Next interface in list */
216 while (addrs != NULL)
219 * Make a copy of the next interface pointer...
222 next = addrs->ifa_next;
225 * Free data values as needed...
230 free(addrs->ifa_name);
231 addrs->ifa_name = NULL;
236 free(addrs->ifa_addr);
237 addrs->ifa_addr = NULL;
240 if (addrs->ifa_netmask)
242 free(addrs->ifa_netmask);
243 addrs->ifa_netmask = NULL;
246 if (addrs->ifa_dstaddr)
248 free(addrs->ifa_dstaddr);
249 addrs->ifa_dstaddr = NULL;
253 * Free this node and continue to the next...
261 #endif /* !HAVE_GETIFADDRS */
265 * End of "$Id: getifaddrs.c 9042 2010-03-24 00:45:34Z mike $".