--- getifaddrs.c.orig 1970-01-01 01:00:00.000000000 +0100 +++ getifaddrs.c 2011-07-07 23:19:33.000000000 +0200 @@ -0,0 +1,275 @@ +/* downloaded from http://ftp.uninett.no/pub/OpenBSD/src/kerberosV/src/lib/roken/getifaddrs.c */ +#if !HAVE_GETIFADDRS +/* + * Copyright (c) 2000 - 2001 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 THE INSTITUTE OR CONTRIBUTORS 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef HAVE_SYS_SOCKIO_H +#include +#endif + +#ifdef HAVE_NETINET_IN6_VAR_H +#include +#endif + +#ifndef max +#define max(a,b) ((a)>(b)?(a):(b)) +#endif + +#include "ifaddrs.h" + +static int +getifaddrs2(struct ifaddrs **ifap, + int af, int siocgifconf, int siocgifflags, + size_t ifreq_sz) +{ + int ret; + int fd; + size_t buf_size; + char *buf; + struct ifconf ifconf; + int num, j = 0; + char *p; + size_t sz; + struct sockaddr sa_zero; + struct ifreq *ifr; + + struct ifaddrs *start, **end = &start; + + buf = NULL; + + memset (&sa_zero, 0, sizeof(sa_zero)); + fd = socket(af, SOCK_DGRAM, 0); + if (fd < 0) + return -1; + + buf_size = 8192; + for (;;) { + buf = calloc(1, buf_size); + if (buf == NULL) { + ret = ENOMEM; + goto error_out; + } + ifconf.ifc_len = buf_size; + ifconf.ifc_buf = buf; + + /* + * Solaris returns EINVAL when the buffer is too small. + */ + if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) { + ret = errno; + goto error_out; + } + /* + * Can the difference between a full and a overfull buf + * be determined? + */ + + if (ifconf.ifc_len < (int)buf_size) + break; + free (buf); + buf_size *= 2; + } + + num = ifconf.ifc_len / ifreq_sz; + j = 0; + for (p = ifconf.ifc_buf; + p < ifconf.ifc_buf + ifconf.ifc_len; + p += sz) { + struct ifreq ifreq; + struct sockaddr *sa; + size_t salen; + + ifr = (struct ifreq *)p; + sa = &ifr->ifr_addr; + + sz = ifreq_sz; + salen = sizeof(struct sockaddr); +#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN + salen = sa->sa_len; + sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len); +#endif +#ifdef SA_LEN + salen = SA_LEN(sa); + sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa)); +#endif + memset (&ifreq, 0, sizeof(ifreq)); + memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name)); + + if (ioctl(fd, siocgifflags, &ifreq) < 0) { + ret = errno; + goto error_out; + } + + *end = malloc(sizeof(**end)); + + (*end)->ifa_next = NULL; + (*end)->ifa_name = strdup(ifr->ifr_name); + (*end)->ifa_flags = ifreq.ifr_flags; + (*end)->ifa_addr = malloc(salen); + memcpy((*end)->ifa_addr, sa, salen); + (*end)->ifa_netmask = NULL; + +#if 0 + /* fix these when we actually need them */ + if(ifreq.ifr_flags & IFF_BROADCAST) { + (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr)); + memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr, + sizeof(ifr->ifr_broadaddr)); + } else if(ifreq.ifr_flags & IFF_POINTOPOINT) { + (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr)); + memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr, + sizeof(ifr->ifr_dstaddr)); + } else + (*end)->ifa_dstaddr = NULL; +#else + (*end)->ifa_dstaddr = NULL; +#endif + + (*end)->ifa_data = NULL; + + end = &(*end)->ifa_next; + + } + *ifap = start; + close(fd); + free(buf); + return 0; + error_out: + close(fd); + free(buf); + errno = ret; + return -1; +} + +int +getifaddrs(struct ifaddrs **ifap) +{ + int ret = -1; + errno = ENXIO; +#if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS) + if (ret) + ret = getifaddrs2 (ifap, AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS, + sizeof(struct in6_ifreq)); +#endif +#if defined(HAVE_IPV6) && defined(SIOCGIFCONF) + if (ret) + ret = getifaddrs2 (ifap, AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS, + sizeof(struct ifreq)); +#endif +#if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS) + if (ret) + ret = getifaddrs2 (ifap, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, + sizeof(struct ifreq)); +#endif + return ret; +} + +void +freeifaddrs(struct ifaddrs *ifp) +{ + struct ifaddrs *p, *q; + + for(p = ifp; p; ) { + free(p->ifa_name); + if(p->ifa_addr) + free(p->ifa_addr); + if(p->ifa_dstaddr) + free(p->ifa_dstaddr); + if(p->ifa_netmask) + free(p->ifa_netmask); + if(p->ifa_data) + free(p->ifa_data); + q = p; + p = p->ifa_next; + free(q); + } +} + +#ifdef TEST + +void +print_addr(const char *s, struct sockaddr *sa) +{ + int i; + printf(" %s=%d/", s, sa->sa_family); +#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN + for(i = 0; i < sa->sa_len - ((long)sa->sa_data - (long)&sa->sa_family); i++) + printf("%02x", ((unsigned char*)sa->sa_data)[i]); +#else + for(i = 0; i < sizeof(sa->sa_data); i++) + printf("%02x", ((unsigned char*)sa->sa_data)[i]); +#endif + printf("\n"); +} + +void +print_ifaddrs(struct ifaddrs *x) +{ + struct ifaddrs *p; + + for(p = x; p; p = p->ifa_next) { + printf("%s\n", p->ifa_name); + printf(" flags=%x\n", p->ifa_flags); + if(p->ifa_addr) + print_addr("addr", p->ifa_addr); + if(p->ifa_dstaddr) + print_addr("dstaddr", p->ifa_dstaddr); + if(p->ifa_netmask) + print_addr("netmask", p->ifa_netmask); + printf(" %p\n", p->ifa_data); + } +} + +int +main() +{ + struct ifaddrs *a = NULL, *b; + getifaddrs2(&a, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, sizeof(struct ifreq)); + print_ifaddrs(a); + printf("---\n"); + getifaddrs(&b); + print_ifaddrs(b); + return 0; +} +#endif +#endif +