summaryrefslogtreecommitdiff
path: root/services/getifaddrs.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'services/getifaddrs.cpp')
-rw-r--r--services/getifaddrs.cpp270
1 files changed, 270 insertions, 0 deletions
diff --git a/services/getifaddrs.cpp b/services/getifaddrs.cpp
new file mode 100644
index 0000000..b4edb68
--- /dev/null
+++ b/services/getifaddrs.cpp
@@ -0,0 +1,270 @@
+/* getifaddrs -- get names and addresses of all network interfaces
+ Copyright (C) 1999,2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/**
+ * 02-12-26, tim@tjansen.de: put in kde_ namespace, C++ fixes,
+ * included ifreq.h
+ * removed glibc dependencies
+ */
+
+#include "config.h"
+
+#ifndef HAVE_IFADDRS_H
+
+#include "getifaddrs.h"
+#include <net/if.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <stdio.h>
+
+#ifndef IF_NAMESIZE
+#define IF_NAMESIZE IFNAMSIZ
+#endif
+
+#ifdef SIOCGIFCONF
+
+#define old_siocgifconf 0
+
+static inline void
+__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
+{
+ int fd = sockfd;
+ struct ifconf ifc;
+ int rq_len;
+ int nifs;
+# define RQ_IFS 4
+
+ if (fd < 0)
+ fd = socket (AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0)
+ {
+ *num_ifs = 0;
+ *ifreqs = NULL;
+ return;
+ }
+
+ ifc.ifc_buf = NULL;
+
+ /* We may be able to get the needed buffer size directly, rather than
+ guessing. */
+ if (! old_siocgifconf)
+ {
+ ifc.ifc_buf = NULL;
+ ifc.ifc_len = 0;
+ if (ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
+ {
+ rq_len = RQ_IFS * sizeof (struct ifreq);
+ }
+ else
+ rq_len = ifc.ifc_len;
+ }
+ else
+ rq_len = RQ_IFS * sizeof (struct ifreq);
+
+ /* Read all the interfaces out of the kernel. */
+ while (1)
+ {
+ ifc.ifc_len = rq_len;
+ ifc.ifc_buf = (char*) realloc (ifc.ifc_buf, ifc.ifc_len);
+ if (ifc.ifc_buf == NULL || ioctl (fd, SIOCGIFCONF, &ifc) < 0)
+ {
+ if (ifc.ifc_buf)
+ free (ifc.ifc_buf);
+
+ if (fd != sockfd)
+ close (fd);
+
+ *num_ifs = 0;
+ *ifreqs = NULL;
+ return;
+ }
+
+ if (!old_siocgifconf || ifc.ifc_len < rq_len)
+ break;
+
+ rq_len *= 2;
+ }
+
+ nifs = ifc.ifc_len / sizeof (struct ifreq);
+
+ if (fd != sockfd)
+ close (fd);
+
+ *num_ifs = nifs;
+ *ifreqs = (ifreq*)realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
+}
+
+static inline struct ifreq *
+__if_nextreq (struct ifreq *ifr)
+{
+ return ifr + 1;
+}
+
+static inline void
+__if_freereq (struct ifreq *ifreqs, int num_ifs)
+{
+ free (ifreqs);
+}
+
+/* Create a linked list of `struct kde_ifaddrs' structures, one for each
+ network interface on the host machine. If successful, store the
+ list in *IFAP and return 0. On errors, return -1 and set `errno'. */
+int
+kde_getifaddrs (struct kde_ifaddrs **ifap)
+{
+ /* This implementation handles only IPv4 interfaces.
+ The various ioctls below will only work on an AF_INET socket.
+ Some different mechanism entirely must be used for IPv6. */
+ int fd = socket (AF_INET, SOCK_DGRAM, 0);
+ struct ifreq *ifreqs;
+ int nifs;
+
+ if (fd < 0)
+ return -1;
+
+ __ifreq (&ifreqs, &nifs, fd);
+ if (ifreqs == NULL) /* XXX doesn't distinguish error vs none */
+ {
+ close (fd);
+ return -1;
+ }
+
+ /* Now we have the list of interfaces and each one's address.
+ Put it into the expected format and fill in the remaining details. */
+ if (nifs == 0)
+ *ifap = NULL;
+ else
+ {
+ struct Storage
+ {
+ struct kde_ifaddrs ia;
+ struct sockaddr addr, netmask, broadaddr;
+ char name[IF_NAMESIZE];
+ } *storage;
+ struct ifreq *ifr;
+ int i;
+
+ storage = (Storage*) malloc (nifs * sizeof storage[0]);
+ if (storage == NULL)
+ {
+ close (fd);
+ __if_freereq (ifreqs, nifs);
+ return -1;
+ }
+
+ i = 0;
+ ifr = ifreqs;
+ do
+ {
+ /* Fill in all pointers to the storage we've already allocated. */
+ storage[i].ia.ifa_next = &storage[i + 1].ia;
+ storage[i].ia.ifa_addr = &storage[i].addr;
+ storage[i].ia.ifa_netmask = &storage[i].netmask;
+ storage[i].ia.ifa_broadaddr = &storage[i].broadaddr; /* & dstaddr */
+
+ /* Now copy the information we already have from SIOCGIFCONF. */
+ storage[i].ia.ifa_name = strncpy (storage[i].name, ifr->ifr_name,
+ sizeof storage[i].name);
+ storage[i].addr = ifr->ifr_addr;
+
+ /* The SIOCGIFCONF call filled in only the name and address.
+ Now we must also ask for the other information we need. */
+
+ if (ioctl (fd, SIOCGIFFLAGS, ifr) < 0)
+ break;
+ storage[i].ia.ifa_flags = ifr->ifr_flags;
+
+ ifr->ifr_addr = storage[i].addr;
+
+ if (ioctl (fd, SIOCGIFNETMASK, ifr) < 0)
+ break;
+ storage[i].netmask = ifr->ifr_netmask;
+
+ if (ifr->ifr_flags & IFF_BROADCAST)
+ {
+ ifr->ifr_addr = storage[i].addr;
+ if (ioctl (fd, SIOCGIFBRDADDR, ifr) < 0)
+ break;
+ storage[i].broadaddr = ifr->ifr_broadaddr;
+ }
+ else if (ifr->ifr_flags & IFF_POINTOPOINT)
+ {
+ ifr->ifr_addr = storage[i].addr;
+// Needed on Cygwin
+#ifndef SIOCGIFDSTADDR
+ #define SIOCGIFDSTADDR 0x8917
+#endif
+ if (ioctl (fd, SIOCGIFDSTADDR, ifr) < 0)
+ break;
+#if HAVE_IFR_DSTADDR
+ storage[i].broadaddr = ifr->ifr_dstaddr;
+#else
+ // Fix for Cygwin
+ storage[i].broadaddr = ifr->ifr_broadaddr;
+#endif
+ }
+ else
+ /* Just 'cause. */
+ memset (&storage[i].broadaddr, 0, sizeof storage[i].broadaddr);
+
+ storage[i].ia.ifa_data = NULL; /* Nothing here for now. */
+
+ ifr = __if_nextreq (ifr);
+ } while (++i < nifs);
+ if (i < nifs) /* Broke out early on error. */
+ {
+ close (fd);
+ free (storage);
+ __if_freereq (ifreqs, nifs);
+ return -1;
+ }
+
+ storage[i - 1].ia.ifa_next = NULL;
+
+ *ifap = &storage[0].ia;
+
+ close (fd);
+ __if_freereq (ifreqs, nifs);
+ }
+
+ return 0;
+}
+
+void
+kde_freeifaddrs (struct kde_ifaddrs *ifa)
+{
+ free (ifa);
+}
+
+#else
+int kde_getifaddrs(struct kde_ifaddrs **) {
+ return 1;
+}
+void kde_freeifaddrs(struct kde_ifaddrs *) {
+}
+struct { } kde_ifaddrs;
+
+#endif
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 03:26:37 +0000