getifaddrs implementation using SIOCGIFCONFIG etc
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9255 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
261
lib/roken/getifaddrs.c
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261
lib/roken/getifaddrs.c
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/*
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* Copyright (c) 2000 Kungliga Tekniska H<>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id$");
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#endif
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#include "roken.h"
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#ifdef __osf__
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/* hate */
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struct rtentry;
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struct mbuf;
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif /* HAVE_SYS_SOCKIO_H */
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#ifdef HAVE_NETINET_IN6_VAR_H
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#include <netinet/in6_var.h>
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#endif /* HAVE_NETINET_IN6_VAR_H */
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#include <ifaddrs.h>
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static int
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getifaddrs2(struct ifaddrs **ifap,
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int af, int siocgifconf, int siocgifflags,
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size_t ifreq_sz)
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{
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int ret;
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int fd;
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size_t buf_size;
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char *buf;
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struct ifconf ifconf;
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int num, j = 0;
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char *p;
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size_t sz;
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struct sockaddr sa_zero;
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struct ifreq *ifr;
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struct ifaddrs *start, **end = &start;
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buf = NULL;
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memset (&sa_zero, 0, sizeof(sa_zero));
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fd = socket(af, SOCK_DGRAM, 0);
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if (fd < 0)
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return -1;
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buf_size = 8192;
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for (;;) {
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buf = calloc(1, buf_size);
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if (buf == NULL) {
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ret = ENOMEM;
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goto error_out;
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}
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ifconf.ifc_len = buf_size;
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ifconf.ifc_buf = buf;
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/*
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* Solaris returns EINVAL when the buffer is too small.
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*/
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if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
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ret = errno;
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goto error_out;
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}
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/*
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* Can the difference between a full and a overfull buf
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* be determined?
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*/
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if (ifconf.ifc_len < buf_size)
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break;
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free (buf);
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buf_size *= 2;
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}
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num = ifconf.ifc_len / ifreq_sz;
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j = 0;
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for (p = ifconf.ifc_buf;
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p < ifconf.ifc_buf + ifconf.ifc_len;
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p += sz) {
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struct ifreq ifreq;
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struct sockaddr *sa;
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ifr = (struct ifreq *)p;
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sa = &ifr->ifr_addr;
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sz = ifreq_sz;
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#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
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sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
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#endif
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#ifdef SA_LEN
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sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
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#endif
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memset (&ifreq, 0, sizeof(ifreq));
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memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
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if (ioctl(fd, siocgifflags, &ifreq) < 0) {
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ret = errno;
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goto error_out;
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}
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*end = malloc(sizeof(**end));
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(*end)->ifa_next = NULL;
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(*end)->ifa_name = strdup(ifr->ifr_name);
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(*end)->ifa_flags = ifreq.ifr_flags;
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(*end)->ifa_addr = malloc(sizeof(*sa));
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memcpy((*end)->ifa_addr, sa, sizeof(*sa));
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(*end)->ifa_netmask = NULL;
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#if 0
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/* fix these when we actually need them */
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if(ifreq.ifr_flags & IFF_BROADCAST) {
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(*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr));
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memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
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sizeof(ifr->ifr_broadaddr));
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} else if(ifreq.ifr_flags & IFF_POINTOPOINT) {
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(*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
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memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
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sizeof(ifr->ifr_dstaddr));
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} else
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(*end)->ifa_dstaddr = NULL;
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#else
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(*end)->ifa_dstaddr = NULL;
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#endif
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(*end)->ifa_data = NULL;
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end = &(*end)->ifa_next;
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}
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*ifap = start;
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return 0;
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error_out:
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errno = ret;
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return -1;
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}
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int
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getifaddrs(struct ifaddrs **ifap)
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{
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int ret = -1;
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errno = ENXIO;
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#if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)
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if (ret)
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ret = getifaddrs2 (ifap, AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS,
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sizeof(struct in6_ifreq));
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#endif
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#if defined(HAVE_IPV6) && defined(SIOCGIFCONF)
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if (ret)
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ret = getifaddrs2 (ifap, AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS,
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sizeof(struct ifreq));
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#endif
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#if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)
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if (ret)
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ret = getifaddrs2 (ifap, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
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sizeof(struct ifreq));
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#endif
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return ret;
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}
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void
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freeifaddrs(struct ifaddrs *ifp)
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{
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struct ifaddrs *p, *q;
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for(p = ifp; p; ) {
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free(p->ifa_name);
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if(p->ifa_addr)
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free(p->ifa_addr);
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if(p->ifa_dstaddr)
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free(p->ifa_dstaddr);
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if(p->ifa_netmask)
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free(p->ifa_netmask);
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if(p->ifa_data)
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free(p->ifa_data);
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q = p;
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p = p->ifa_next;
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free(q);
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}
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}
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#ifdef TEST
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void
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print_addr(const char *s, struct sockaddr *sa)
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{
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int i;
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printf(" %s=%d/", s, sa->sa_family);
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for(i = 0; i < sa->sa_len - ((long)sa->sa_data - (long)&sa->sa_family); i++) {
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printf("%02x", ((unsigned char*)sa->sa_data)[i]);
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}
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printf("\n");
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}
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void
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print_ifaddrs(struct ifaddrs *x)
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{
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struct ifaddrs *p;
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for(p = x; p; p = p->ifa_next) {
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printf("%s\n", p->ifa_name);
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printf(" flags=%x\n", p->ifa_flags);
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if(p->ifa_addr)
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print_addr("addr", p->ifa_addr);
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if(p->ifa_dstaddr)
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print_addr("dstaddr", p->ifa_dstaddr);
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if(p->ifa_netmask)
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print_addr("netmask", p->ifa_netmask);
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printf(" %p\n", p->ifa_data);
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}
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}
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int
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main()
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{
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struct ifaddrs *a = NULL, *b;
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getifaddrs2(&a, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, sizeof(struct ifreq));
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print_ifaddrs(a);
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printf("---\n");
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getifaddrs(&b);
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print_ifaddrs(b);
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return 0;
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}
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#endif
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