1 files changed, 183 insertions, 0 deletions
diff --git a/rfc1035/rfc1035ifconf.c b/rfc1035/rfc1035ifconf.c
new file mode 100644
index 0000000..47b24b2
--- /dev/null
+++ b/rfc1035/rfc1035ifconf.c
@@ -0,0 +1,183 @@
+/*
+** Copyright 2002 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#include "rfc1035.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+
+#if HAVE_SIOCGIFCONF
+
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+static int getifconf(int fd, struct rfc1035_ifconf **ifconf_ptr)
+{
+	struct ifreq ifreq_buf[64];
+	struct ifconf ifc;
+	int i;
+	const struct sockaddr_in *sin;
+	RFC1035_ADDR addr;
+	char ipaddr[RFC1035_NTOABUFSIZE];
+	struct rfc1035_ifconf *ifcptr;
+	struct rfc1035_ifconf **ifconf;
+
+	ifc.ifc_len=sizeof(ifreq_buf);
+	ifc.ifc_req=ifreq_buf;
+
+	if (ioctl(fd, SIOCGIFCONF, &ifc) < 0)
+		return (0);
+
+	for (i=0; i * sizeof(struct ifreq) < ifc.ifc_len; i++)
+	{
+		sin=(const struct sockaddr_in *)&ifreq_buf[i].ifr_addr;
+
+#if RFC1035_IPV6
+		if (sin->sin_family == AF_INET6)
+		{
+			struct sockaddr_in6 sin6;
+
+			memcpy(&sin6, sin, sizeof(sin6));
+			addr=sin6.sin6_addr;
+		}
+		else if (sin->sin_family == AF_INET)
+			rfc1035_ipv4to6(&addr, &sin->sin_addr);
+		else
+			continue;
+#else
+		if (sin->sin_family == AF_INET)
+			addr=sin->sin_addr;
+		else
+			continue;
+#endif
+
+		rfc1035_ntoa(&addr, ipaddr);
+
+		/*
+		** Eliminate any dupes.
+		*/
+
+		ifconf=ifconf_ptr;
+
+		while ( *ifconf )
+		{
+			char ipaddr2[RFC1035_NTOABUFSIZE];
+
+			rfc1035_ntoa(&(*ifconf)->ifaddr, ipaddr2);
+
+			if (strcmp(ipaddr, ipaddr2) == 0)
+				break;
+
+			ifconf= &(*ifconf)->next;
+		}
+
+		if ( *ifconf )
+			continue;	/* Already have this IP addr */
+
+		if ( (ifcptr=malloc(sizeof(struct rfc1035_ifconf))) == NULL ||
+		     (ifcptr->ifname=strdup(ifreq_buf[i].ifr_name)) == NULL)
+		{
+			if (ifcptr)
+				free(ifcptr);
+			return (-1);
+		}
+
+		ifcptr->ifaddr=addr;
+		ifcptr->next=NULL;
+
+		*ifconf= ifcptr;
+	}
+	return (0);
+}
+
+/*
+** On systems that support IPv6, issue an SIOCGIFCONF on both an IPv4 and
+** an IPv6 socket, for good measure.
+*/
+
+static int doifconf(struct rfc1035_ifconf **ifconf_list)
+{
+	int fd;
+
+	fd=socket(PF_INET, SOCK_STREAM, 0);
+
+	if (fd >= 0)
+	{
+		if (getifconf(fd, ifconf_list))
+		{
+			close(fd);
+			return (-1);
+		}
+		close(fd);
+	}
+
+#if RFC1035_IPV6
+
+	fd=socket(PF_INET6, SOCK_STREAM, 0);
+
+	if (fd >= 0)
+	{
+		if (getifconf(fd, ifconf_list))
+		{
+			close(fd);
+			return (-1);
+		}
+		close(fd);
+	}
+#endif
+	return (0);
+}
+
+struct rfc1035_ifconf *rfc1035_ifconf(int *errflag)
+{
+	struct rfc1035_ifconf *ifconf_list=NULL;
+	int dummy;
+
+	if (!errflag)
+		errflag= &dummy;
+
+	*errflag= -1;
+	if (doifconf(&ifconf_list))
+	{
+		rfc1035_ifconf_free(ifconf_list);
+		return (NULL);
+	}
+
+	*errflag=0;
+	return ifconf_list;
+}
+
+#else
+
+struct rfc1035_ifconf *rfc1035_ifconf(int *errflag)
+{
+	if (errflag)
+		*errflag=0;
+	return NULL;
+}
+#endif
+
+void rfc1035_ifconf_free(struct rfc1035_ifconf *ifconf_list)
+{
+	while (ifconf_list)
+	{
+		struct rfc1035_ifconf *p=ifconf_list->next;
+
+		free(ifconf_list->ifname);
+		free(ifconf_list);
+		ifconf_list=p;
+	}
+}
+