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-rw-r--r--lib/libc/net/getifaddrs.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/lib/libc/net/getifaddrs.c b/lib/libc/net/getifaddrs.c
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--- /dev/null
+++ b/lib/libc/net/getifaddrs.c
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+/* $KAME: getifaddrs.c,v 1.9 2001/08/20 02:31:20 itojun Exp $ */
+
+/*
+ * Copyright (c) 1995, 1999
+ * Berkeley Software Design, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
+ */
+/*
+ * NOTE: SIOCGIFCONF case is not LP64 friendly. it also does not perform
+ * try-and-error for region size.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#ifdef NET_RT_IFLIST
+#include <sys/param.h>
+#include <net/route.h>
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#endif
+
+#include <errno.h>
+#include <ifaddrs.h>
+#include <stdlib.h>
+#include <string.h>
+#include "un-namespace.h"
+
+#if !defined(AF_LINK)
+#define SA_LEN(sa) sizeof(struct sockaddr)
+#endif
+
+#if !defined(SA_LEN)
+#define SA_LEN(sa) (sa)->sa_len
+#endif
+
+#define SALIGN (sizeof(long) - 1)
+#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
+
+#ifndef ALIGNBYTES
+/*
+ * On systems with a routing socket, ALIGNBYTES should match the value
+ * that the kernel uses when building the messages.
+ */
+#define ALIGNBYTES XXX
+#endif
+#ifndef ALIGN
+#define ALIGN(p) (((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
+#endif
+
+#define MAX_SYSCTL_TRY 5
+
+int
+getifaddrs(struct ifaddrs **pif)
+{
+ int icnt = 1;
+ int dcnt = 0;
+ int ncnt = 0;
+ int ntry = 0;
+ int mib[6];
+ size_t needed;
+ char *buf;
+ char *next;
+ struct ifaddrs *cif = 0;
+ char *p, *p0;
+ struct rt_msghdr *rtm;
+ struct if_msghdrl *ifm;
+ struct ifa_msghdrl *ifam;
+ struct sockaddr_dl *dl;
+ struct sockaddr *sa;
+ struct ifaddrs *ifa, *ift;
+ struct if_data *if_data;
+ u_short idx = 0;
+ int i;
+ size_t len, alen;
+ char *data;
+ char *names;
+
+ mib[0] = CTL_NET;
+ mib[1] = PF_ROUTE;
+ mib[2] = 0; /* protocol */
+ mib[3] = 0; /* wildcard address family */
+ mib[4] = NET_RT_IFLISTL;/* extra fields for extensible msghdr structs */
+ mib[5] = 0; /* no flags */
+ do {
+ /*
+ * We'll try to get addresses several times in case that
+ * the number of addresses is unexpectedly increased during
+ * the two sysctl calls. This should rarely happen, but we'll
+ * try to do our best for applications that assume success of
+ * this library (which should usually be the case).
+ * Portability note: since FreeBSD does not add margin of
+ * memory at the first sysctl, the possibility of failure on
+ * the second sysctl call is a bit higher.
+ */
+
+ if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+ return (-1);
+ if ((buf = malloc(needed)) == NULL)
+ return (-1);
+ if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+ if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
+ free(buf);
+ return (-1);
+ }
+ free(buf);
+ buf = NULL;
+ }
+ } while (buf == NULL);
+
+ for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
+ rtm = (struct rt_msghdr *)(void *)next;
+ if (rtm->rtm_version != RTM_VERSION)
+ continue;
+ switch (rtm->rtm_type) {
+ case RTM_IFINFO:
+ ifm = (struct if_msghdrl *)(void *)rtm;
+ if (ifm->ifm_addrs & RTA_IFP) {
+ idx = ifm->ifm_index;
+ ++icnt;
+ if_data = IF_MSGHDRL_IFM_DATA(ifm);
+ dcnt += if_data->ifi_datalen;
+ dl = (struct sockaddr_dl *)IF_MSGHDRL_RTA(ifm);
+ dcnt += SA_RLEN((struct sockaddr *)(void*)dl) +
+ ALIGNBYTES;
+ ncnt += dl->sdl_nlen + 1;
+ } else
+ idx = 0;
+ break;
+
+ case RTM_NEWADDR:
+ ifam = (struct ifa_msghdrl *)(void *)rtm;
+ if (idx && ifam->ifam_index != idx)
+ abort(); /* this cannot happen */
+
+#define RTA_MASKS (RTA_NETMASK | RTA_IFA | RTA_BRD)
+ if (idx == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
+ break;
+ p = (char *)IFA_MSGHDRL_RTA(ifam);
+ ++icnt;
+ if_data = IFA_MSGHDRL_IFAM_DATA(ifam);
+ dcnt += if_data->ifi_datalen + ALIGNBYTES;
+
+ /* Scan to look for length of address */
+ alen = 0;
+ for (p0 = p, i = 0; i < RTAX_MAX; i++) {
+ if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
+ == 0)
+ continue;
+ sa = (struct sockaddr *)(void *)p;
+ len = SA_RLEN(sa);
+ if (i == RTAX_IFA) {
+ alen = len;
+ break;
+ }
+ p += len;
+ }
+ for (p = p0, i = 0; i < RTAX_MAX; i++) {
+ if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
+ == 0)
+ continue;
+ sa = (struct sockaddr *)(void *)p;
+ len = SA_RLEN(sa);
+ if (i == RTAX_NETMASK && SA_LEN(sa) == 0)
+ dcnt += alen;
+ else
+ dcnt += len;
+ p += len;
+ }
+ break;
+ }
+ }
+
+ if (icnt + dcnt + ncnt == 1) {
+ *pif = NULL;
+ free(buf);
+ return (0);
+ }
+ data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
+ if (data == NULL) {
+ free(buf);
+ return(-1);
+ }
+
+ ifa = (struct ifaddrs *)(void *)data;
+ data += sizeof(struct ifaddrs) * icnt;
+ names = data + dcnt;
+
+ memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
+ ift = ifa;
+
+ idx = 0;
+ for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
+ rtm = (struct rt_msghdr *)(void *)next;
+ if (rtm->rtm_version != RTM_VERSION)
+ continue;
+ switch (rtm->rtm_type) {
+ case RTM_IFINFO:
+ ifm = (struct if_msghdrl *)(void *)rtm;
+ if ((ifm->ifm_addrs & RTA_IFP) == 0) {
+ idx = 0;
+ break;
+ }
+
+ idx = ifm->ifm_index;
+ dl = (struct sockaddr_dl *)IF_MSGHDRL_RTA(ifm);
+
+ cif = ift;
+ ift->ifa_name = names;
+ ift->ifa_flags = (int)ifm->ifm_flags;
+ memcpy(names, dl->sdl_data, (size_t)dl->sdl_nlen);
+ names[dl->sdl_nlen] = 0;
+ names += dl->sdl_nlen + 1;
+
+ ift->ifa_addr = (struct sockaddr *)(void *)data;
+ memcpy(data, dl, (size_t)SA_LEN((struct sockaddr *)
+ (void *)dl));
+ data += SA_RLEN((struct sockaddr *)(void *)dl);
+
+ if_data = IF_MSGHDRL_IFM_DATA(ifm);
+ /* ifm_data needs to be aligned */
+ ift->ifa_data = data = (void *)ALIGN(data);
+ memcpy(data, if_data, if_data->ifi_datalen);
+ data += if_data->ifi_datalen;
+
+ ift = (ift->ifa_next = ift + 1);
+ break;
+
+ case RTM_NEWADDR:
+ ifam = (struct ifa_msghdrl *)(void *)rtm;
+ if (idx && ifam->ifam_index != idx)
+ abort(); /* this cannot happen */
+
+ if (idx == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
+ break;
+ ift->ifa_name = cif->ifa_name;
+ ift->ifa_flags = cif->ifa_flags;
+ ift->ifa_data = NULL;
+
+ p = (char *)IFA_MSGHDRL_RTA(ifam);
+ /* Scan to look for length of address */
+ alen = 0;
+ for (p0 = p, i = 0; i < RTAX_MAX; i++) {
+ if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
+ == 0)
+ continue;
+ sa = (struct sockaddr *)(void *)p;
+ len = SA_RLEN(sa);
+ if (i == RTAX_IFA) {
+ alen = len;
+ break;
+ }
+ p += len;
+ }
+ for (p = p0, i = 0; i < RTAX_MAX; i++) {
+ if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
+ == 0)
+ continue;
+ sa = (struct sockaddr *)(void *)p;
+ len = SA_RLEN(sa);
+ switch (i) {
+ case RTAX_IFA:
+ ift->ifa_addr =
+ (struct sockaddr *)(void *)data;
+ memcpy(data, p, len);
+ data += len;
+ break;
+
+ case RTAX_NETMASK:
+ ift->ifa_netmask =
+ (struct sockaddr *)(void *)data;
+ if (SA_LEN(sa) == 0) {
+ memset(data, 0, alen);
+ data += alen;
+ break;
+ }
+ memcpy(data, p, len);
+ data += len;
+ break;
+
+ case RTAX_BRD:
+ ift->ifa_broadaddr =
+ (struct sockaddr *)(void *)data;
+ memcpy(data, p, len);
+ data += len;
+ break;
+ }
+ p += len;
+ }
+
+ if_data = IFA_MSGHDRL_IFAM_DATA(ifam);
+ /* ifam_data needs to be aligned */
+ ift->ifa_data = data = (void *)ALIGN(data);
+ memcpy(data, if_data, if_data->ifi_datalen);
+ data += if_data->ifi_datalen;
+
+ ift = (ift->ifa_next = ift + 1);
+ break;
+ }
+ }
+
+ free(buf);
+
+ if (--ift >= ifa) {
+ ift->ifa_next = NULL;
+ *pif = ifa;
+ } else {
+ *pif = NULL;
+ free(ifa);
+ }
+ return (0);
+}
+
+void
+freeifaddrs(struct ifaddrs *ifp)
+{
+
+ free(ifp);
+}
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