r26467: Use getifaddrs() for interface enumeration and provide replacements for platforms that don't have it in lib/replace.

(This used to be commit 9b4924fbd8619033c55b4c6e2589da247332e7db)

1 files changed, 391 insertions, 0 deletions

diff --git a/source4/lib/replace/getifaddrs.c b/source4/lib/replace/getifaddrs.c
new file mode 100644
index 0000000000..3969535a0b
--- /dev/null
+++ b/source4/lib/replace/getifaddrs.c
@@ -0,0 +1,391 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Andrew Tridgell 1998
+   Copyright (C) Jeremy Allison 2007
+   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program 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 General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#ifndef SIOCGIFCONF
+#ifdef HAVE_SYS_SOCKIO_H
+#include <sys/sockio.h>
+#endif
+#endif
+
+#ifdef HAVE_IFACE_GETIFADDRS
+#define _FOUND_IFACE_ANY
+#else
+
+void freeifaddrs(struct ifaddrs *ifp)
+{
+	free(ifp->ifa_name);
+	free(ifp->ifa_addr);
+	free(ifp->ifa_netmask);
+	free(ifp->ifa_dstaddr);
+	if (ifp->ifa_next != NULL)
+		freeifaddrs(ifp->ifa_next);
+	free(ifp);
+}
+
+struct sockaddr *sockaddr_dup(struct sockaddr *sa)
+{
+	struct sockaddr *ret = calloc(1, sa->sa_len);
+	if (ret == NULL)
+		return NULL;
+	memcpy(ret, sa, sa->sa_len);
+	return ret;
+}
+#endif
+
+#if HAVE_IFACE_IFCONF
+
+/* this works for Linux 2.2, Solaris 2.5, SunOS4, HPUX 10.20, OSF1
+   V4.0, Ultrix 4.4, SCO Unix 3.2, IRIX 6.4 and FreeBSD 3.2.
+
+   It probably also works on any BSD style system.  */
+
+int getifaddrs(struct ifaddrs **ifap)
+{
+	struct ifconf ifc;
+	char buff[8192];
+	int fd, i, n;
+	struct ifreq *ifr=NULL;
+	int total = 0;
+	struct in_addr ipaddr;
+	struct in_addr nmask;
+	char *iname;
+	struct ifaddrs *curif, *lastif;
+
+	*ifap = NULL;
+
+	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		return -1;
+	}
+  
+	ifc.ifc_len = sizeof(buff);
+	ifc.ifc_buf = buff;
+
+	if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
+		close(fd);
+		return -1;
+	} 
+
+	ifr = ifc.ifc_req;
+  
+	n = ifc.ifc_len / sizeof(struct ifreq);
+
+	/* Loop through interfaces, looking for given IP address */
+	for (i=n-1;i>=0 && total < max_interfaces;i--) {
+		if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) {
+			freeifaddrs(*ifap);
+		}
+
+		curif = calloc(1, sizeof(struct ifaddrs));
+		if (lastif == NULL) {
+			*ifap = curif;
+		} else {
+			lastif->ifa_next = (*ifap);
+		}
+
+		curif->ifa_name = strdup(ifr[i].ifr_name);
+		curif->ifa_flags = ifreq.ifr_flags;
+		curif->ifa_addr = sockaddr_dup(&ifr[i].ifr_addr);
+		curif->ifa_dstaddr = NULL;
+		curif->ifa_data = NULL;
+		curif->ifa_next = NULL;
+		curif->ifa_netmask = NULL;
+
+		if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) != 0) {
+			freeifaddrs(*ifap);
+			return -1;
+		}  
+
+		if (!(ifr[i].ifr_flags & IFF_UP)) {
+			freeifaddrs(curif);
+			continue;
+		}
+
+		if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) {
+			freeifaddrs(*ifap);
+			return -1;
+		}  
+
+		curif->ifa_netmask = sockaddr_dup(&ifr[i].ifr_addr);
+
+		lastif = curif;
+	}
+
+	close(fd);
+
+	return 0;
+}  
+
+#define _FOUND_IFACE_ANY
+#endif /* HAVE_IFACE_IFCONF */
+#ifdef HAVE_IFACE_IFREQ
+
+#ifndef I_STR
+#include <sys/stropts.h>
+#endif
+
+/****************************************************************************
+this should cover most of the streams based systems
+Thanks to Andrej.Borsenkow@mow.siemens.ru for several ideas in this code
+****************************************************************************/
+int getifaddrs(struct ifaddrs **ifap)
+{
+	struct ifreq ifreq;
+	struct strioctl strioctl;
+	char buff[8192];
+	int fd, i, n;
+	struct ifreq *ifr=NULL;
+	int total = 0;
+	struct in_addr ipaddr;
+	struct in_addr nmask;
+	char *iname;
+	struct ifaddrs *curif;
+
+	*ifap = NULL;
+
+	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		return -1;
+	}
+  
+	strioctl.ic_cmd = SIOCGIFCONF;
+	strioctl.ic_dp  = buff;
+	strioctl.ic_len = sizeof(buff);
+	if (ioctl(fd, I_STR, &strioctl) < 0) {
+		close(fd);
+		return -1;
+	} 
+
+	/* we can ignore the possible sizeof(int) here as the resulting
+	   number of interface structures won't change */
+	n = strioctl.ic_len / sizeof(struct ifreq);
+
+	/* we will assume that the kernel returns the length as an int
+           at the start of the buffer if the offered size is a
+           multiple of the structure size plus an int */
+	if (n*sizeof(struct ifreq) + sizeof(int) == strioctl.ic_len) {
+		ifr = (struct ifreq *)(buff + sizeof(int));  
+	} else {
+		ifr = (struct ifreq *)buff;  
+	}
+
+	/* Loop through interfaces */
+
+	for (i = 0; i<n && total < max_interfaces; i++) {
+		ifreq = ifr[i];
+  
+		strioctl.ic_cmd = SIOCGIFFLAGS;
+		strioctl.ic_dp  = (char *)&ifreq;
+		strioctl.ic_len = sizeof(struct ifreq);
+		if (ioctl(fd, I_STR, &strioctl) != 0) {
+			freeifaddrs(*ifap);
+			return -1;
+		}
+		
+		if (!(ifreq.ifr_flags & IFF_UP)) {
+			continue;
+		}
+
+		strioctl.ic_cmd = SIOCGIFADDR;
+		strioctl.ic_dp  = (char *)&ifreq;
+		strioctl.ic_len = sizeof(struct ifreq);
+		if (ioctl(fd, I_STR, &strioctl) != 0) {
+			freeifaddrs(*ifap);
+			return -1;
+		}
+
+		curif = calloc(1, sizeof(struct ifaddrs));
+		if (lastif == NULL) {
+			*ifap = curif;
+		} else {
+			lastif->ifa_next = (*ifap);
+		}
+
+		curif->ifa_name = strdup(ifreq.ifr_name);
+		curif->ifa_flags = ifreq.ifr_flags;
+		curif->ifa_addr = sockaddr_dup(&ifreq.ifr_addr);
+		curif->ifa_dstaddr = NULL;
+		curif->ifa_data = NULL;
+		curif->ifa_next = NULL;
+		curif->ifa_netmask = NULL;
+
+		strioctl.ic_cmd = SIOCGIFNETMASK;
+		strioctl.ic_dp  = (char *)&ifreq;
+		strioctl.ic_len = sizeof(struct ifreq);
+		if (ioctl(fd, I_STR, &strioctl) != 0) {
+			freeifaddrs(*ifap);
+			return -1;
+		}
+
+		curif->ifa_netmask = sockaddr_dup(&ifreq.ifr_addr);
+
+		lastif = curif;
+	}
+
+	close(fd);
+
+	return 0;
+}
+
+#define _FOUND_IFACE_ANY
+#endif /* HAVE_IFACE_IFREQ */
+#ifdef HAVE_IFACE_AIX
+
+/****************************************************************************
+this one is for AIX (tested on 4.2)
+****************************************************************************/
+int getifaddrs(struct ifaddrs **ifap)
+{
+	char buff[8192];
+	int fd, i;
+	struct ifconf ifc;
+	struct ifreq *ifr=NULL;
+	struct in_addr ipaddr;
+	struct in_addr nmask;
+	char *iname;
+	int total = 0;
+	struct ifaddrs *curif, *lastif;
+
+	*ifap = NULL;
+
+	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		return -1;
+	}
+
+	ifc.ifc_len = sizeof(buff);
+	ifc.ifc_buf = buff;
+
+	if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
+		close(fd);
+		return -1;
+	}
+
+	ifr = ifc.ifc_req;
+
+	/* Loop through interfaces */
+	i = ifc.ifc_len;
+
+	while (i > 0) {
+		uint_t inc;
+
+		inc = ifr->ifr_addr.sa_len;
+
+		if (ioctl(fd, SIOCGIFADDR, ifr) != 0) {
+			freeaddrinfo(*ifap);
+			return -1;
+		}
+
+		curif = calloc(1, sizeof(struct ifaddrs));
+		if (lastif == NULL) {
+			*ifap = curif;
+		} else {
+			lastif->ifa_next = (*ifap);
+		}
+
+		curif->ifa_name = strdup(ifr->ifr_name);
+		curif->ifa_flags = ifr->ifr_flags;
+		curif->ifa_addr = sockaddr_dup(&ifr->ifr_addr);
+		curif->ifa_dstaddr = NULL;
+		curif->ifa_data = NULL;
+		curif->ifa_netmask = NULL;
+		curif->ifa_next = NULL;
+
+		if (ioctl(fd, SIOCGIFFLAGS, ifr) != 0) {
+			freeaddrinfo(*ifap);
+			return -1;
+		}
+
+		if (!(ifr->ifr_flags & IFF_UP)) {
+			freeaddrinfo(curif);
+			continue;
+		}
+
+		if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) {
+			freeaddrinfo(*ifap);
+			return -1;
+		}
+
+		curif->ifa_netmask = sockaddr_dup(&ifr->ifr_addr);
+
+		lastif = curif;
+
+	next:
+		/*
+		 * Patch from Archie Cobbs (archie@whistle.com).  The
+		 * addresses in the SIOCGIFCONF interface list have a
+		 * minimum size. Usually this doesn't matter, but if
+		 * your machine has tunnel interfaces, etc. that have
+		 * a zero length "link address", this does matter.  */
+
+		if (inc < sizeof(ifr->ifr_addr))
+			inc = sizeof(ifr->ifr_addr);
+		inc += IFNAMSIZ;
+
+		ifr = (struct ifreq*) (((char*) ifr) + inc);
+		i -= inc;
+	}
+
+	close(fd);
+	return 0;
+}
+
+#define _FOUND_IFACE_ANY
+#endif /* HAVE_IFACE_AIX */
+#ifndef _FOUND_IFACE_ANY
+int getifaddrs(struct ifaddrs **ifap)
+{
+	errno = ENOSYS;
+	return -1;
+}
+#endif
+
+#ifdef AUTOCONF_TEST
+/* this is the autoconf driver to test get_interfaces() */
+
+ int main()
+{
+	struct ifaddrs *ifs;
+	int total = get_interfaces(ifaces, MAX_INTERFACES);
+	int i;
+
+	int ret = getifaddrs(&ifs);
+	if (ret != 0) {
+		perror("getifaddrs() failed");
+		return 1;
+	}
+
+	while (ifs) {
+		printf("%-10s ", ifs->ifr_name);
+		printf("IP=%s ", inet_ntoa(((struct sockaddr_in *)ifs->ifr_addr)->sin_addr));
+		printf("NETMASK=%s\n", inet_ntoa(((struct sockaddr_in *)ifs->ifr_netmask)->sin_addr));
+	}
+	return 0;
+}
+#endif