getifaddrs.c revision 78527
172445Sassar/* 272445Sassar * Copyright (c) 2000 - 2001 Kungliga Tekniska H�gskolan 372445Sassar * (Royal Institute of Technology, Stockholm, Sweden). 472445Sassar * All rights reserved. 572445Sassar * 672445Sassar * Redistribution and use in source and binary forms, with or without 772445Sassar * modification, are permitted provided that the following conditions 872445Sassar * are met: 972445Sassar * 1072445Sassar * 1. Redistributions of source code must retain the above copyright 1172445Sassar * notice, this list of conditions and the following disclaimer. 1272445Sassar * 1372445Sassar * 2. Redistributions in binary form must reproduce the above copyright 1472445Sassar * notice, this list of conditions and the following disclaimer in the 1572445Sassar * documentation and/or other materials provided with the distribution. 1672445Sassar * 1772445Sassar * 3. Neither the name of the Institute nor the names of its contributors 1872445Sassar * may be used to endorse or promote products derived from this software 1972445Sassar * without specific prior written permission. 2072445Sassar * 2172445Sassar * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2272445Sassar * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2372445Sassar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2472445Sassar * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2572445Sassar * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2672445Sassar * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2772445Sassar * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2872445Sassar * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2972445Sassar * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3072445Sassar * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3172445Sassar * SUCH DAMAGE. 3272445Sassar */ 3372445Sassar 3472445Sassar#ifdef HAVE_CONFIG_H 3572445Sassar#include <config.h> 3678527SassarRCSID("$Id: getifaddrs.c,v 1.5 2001/04/17 08:27:47 joda Exp $"); 3772445Sassar#endif 3872445Sassar#include "roken.h" 3972445Sassar 4072445Sassar#ifdef __osf__ 4172445Sassar/* hate */ 4272445Sassarstruct rtentry; 4372445Sassarstruct mbuf; 4472445Sassar#endif 4572445Sassar#ifdef HAVE_NET_IF_H 4672445Sassar#include <net/if.h> 4772445Sassar#endif 4872445Sassar 4972445Sassar#ifdef HAVE_SYS_SOCKIO_H 5072445Sassar#include <sys/sockio.h> 5172445Sassar#endif /* HAVE_SYS_SOCKIO_H */ 5272445Sassar 5372445Sassar#ifdef HAVE_NETINET_IN6_VAR_H 5472445Sassar#include <netinet/in6_var.h> 5572445Sassar#endif /* HAVE_NETINET_IN6_VAR_H */ 5672445Sassar 5772445Sassar#include <ifaddrs.h> 5872445Sassar 5972445Sassarstatic int 6072445Sassargetifaddrs2(struct ifaddrs **ifap, 6172445Sassar int af, int siocgifconf, int siocgifflags, 6272445Sassar size_t ifreq_sz) 6372445Sassar{ 6472445Sassar int ret; 6572445Sassar int fd; 6672445Sassar size_t buf_size; 6772445Sassar char *buf; 6872445Sassar struct ifconf ifconf; 6972445Sassar int num, j = 0; 7072445Sassar char *p; 7172445Sassar size_t sz; 7272445Sassar struct sockaddr sa_zero; 7372445Sassar struct ifreq *ifr; 7472445Sassar 7572445Sassar struct ifaddrs *start, **end = &start; 7672445Sassar 7772445Sassar buf = NULL; 7872445Sassar 7972445Sassar memset (&sa_zero, 0, sizeof(sa_zero)); 8072445Sassar fd = socket(af, SOCK_DGRAM, 0); 8172445Sassar if (fd < 0) 8272445Sassar return -1; 8372445Sassar 8472445Sassar buf_size = 8192; 8572445Sassar for (;;) { 8672445Sassar buf = calloc(1, buf_size); 8772445Sassar if (buf == NULL) { 8872445Sassar ret = ENOMEM; 8972445Sassar goto error_out; 9072445Sassar } 9172445Sassar ifconf.ifc_len = buf_size; 9272445Sassar ifconf.ifc_buf = buf; 9372445Sassar 9472445Sassar /* 9572445Sassar * Solaris returns EINVAL when the buffer is too small. 9672445Sassar */ 9772445Sassar if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) { 9872445Sassar ret = errno; 9972445Sassar goto error_out; 10072445Sassar } 10172445Sassar /* 10272445Sassar * Can the difference between a full and a overfull buf 10372445Sassar * be determined? 10472445Sassar */ 10572445Sassar 10672445Sassar if (ifconf.ifc_len < buf_size) 10772445Sassar break; 10872445Sassar free (buf); 10972445Sassar buf_size *= 2; 11072445Sassar } 11172445Sassar 11272445Sassar num = ifconf.ifc_len / ifreq_sz; 11372445Sassar j = 0; 11472445Sassar for (p = ifconf.ifc_buf; 11572445Sassar p < ifconf.ifc_buf + ifconf.ifc_len; 11672445Sassar p += sz) { 11772445Sassar struct ifreq ifreq; 11872445Sassar struct sockaddr *sa; 11972445Sassar size_t salen; 12072445Sassar 12172445Sassar ifr = (struct ifreq *)p; 12272445Sassar sa = &ifr->ifr_addr; 12372445Sassar 12472445Sassar sz = ifreq_sz; 12572445Sassar salen = sizeof(struct sockaddr); 12672445Sassar#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN 12772445Sassar salen = sa->sa_len; 12872445Sassar sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len); 12972445Sassar#endif 13072445Sassar#ifdef SA_LEN 13172445Sassar salen = SA_LEN(sa); 13272445Sassar sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa)); 13372445Sassar#endif 13472445Sassar memset (&ifreq, 0, sizeof(ifreq)); 13572445Sassar memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name)); 13672445Sassar 13772445Sassar if (ioctl(fd, siocgifflags, &ifreq) < 0) { 13872445Sassar ret = errno; 13972445Sassar goto error_out; 14072445Sassar } 14172445Sassar 14272445Sassar *end = malloc(sizeof(**end)); 14372445Sassar 14472445Sassar (*end)->ifa_next = NULL; 14572445Sassar (*end)->ifa_name = strdup(ifr->ifr_name); 14672445Sassar (*end)->ifa_flags = ifreq.ifr_flags; 14772445Sassar (*end)->ifa_addr = malloc(salen); 14872445Sassar memcpy((*end)->ifa_addr, sa, salen); 14972445Sassar (*end)->ifa_netmask = NULL; 15072445Sassar 15172445Sassar#if 0 15272445Sassar /* fix these when we actually need them */ 15372445Sassar if(ifreq.ifr_flags & IFF_BROADCAST) { 15472445Sassar (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr)); 15572445Sassar memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr, 15672445Sassar sizeof(ifr->ifr_broadaddr)); 15772445Sassar } else if(ifreq.ifr_flags & IFF_POINTOPOINT) { 15872445Sassar (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr)); 15972445Sassar memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr, 16072445Sassar sizeof(ifr->ifr_dstaddr)); 16172445Sassar } else 16272445Sassar (*end)->ifa_dstaddr = NULL; 16372445Sassar#else 16472445Sassar (*end)->ifa_dstaddr = NULL; 16572445Sassar#endif 16672445Sassar 16772445Sassar (*end)->ifa_data = NULL; 16872445Sassar 16972445Sassar end = &(*end)->ifa_next; 17072445Sassar 17172445Sassar } 17272445Sassar *ifap = start; 17378527Sassar close(fd); 17472445Sassar free(buf); 17572445Sassar return 0; 17672445Sassar error_out: 17778527Sassar close(fd); 17872445Sassar free(buf); 17972445Sassar errno = ret; 18072445Sassar return -1; 18172445Sassar} 18272445Sassar 18372445Sassarint 18472445Sassargetifaddrs(struct ifaddrs **ifap) 18572445Sassar{ 18672445Sassar int ret = -1; 18772445Sassar errno = ENXIO; 18872445Sassar#if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS) 18972445Sassar if (ret) 19072445Sassar ret = getifaddrs2 (ifap, AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS, 19172445Sassar sizeof(struct in6_ifreq)); 19272445Sassar#endif 19372445Sassar#if defined(HAVE_IPV6) && defined(SIOCGIFCONF) 19472445Sassar if (ret) 19572445Sassar ret = getifaddrs2 (ifap, AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS, 19672445Sassar sizeof(struct ifreq)); 19772445Sassar#endif 19872445Sassar#if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS) 19972445Sassar if (ret) 20072445Sassar ret = getifaddrs2 (ifap, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, 20172445Sassar sizeof(struct ifreq)); 20272445Sassar#endif 20372445Sassar return ret; 20472445Sassar} 20572445Sassar 20672445Sassarvoid 20772445Sassarfreeifaddrs(struct ifaddrs *ifp) 20872445Sassar{ 20972445Sassar struct ifaddrs *p, *q; 21072445Sassar 21172445Sassar for(p = ifp; p; ) { 21272445Sassar free(p->ifa_name); 21372445Sassar if(p->ifa_addr) 21472445Sassar free(p->ifa_addr); 21572445Sassar if(p->ifa_dstaddr) 21672445Sassar free(p->ifa_dstaddr); 21772445Sassar if(p->ifa_netmask) 21872445Sassar free(p->ifa_netmask); 21972445Sassar if(p->ifa_data) 22072445Sassar free(p->ifa_data); 22172445Sassar q = p; 22272445Sassar p = p->ifa_next; 22372445Sassar free(q); 22472445Sassar } 22572445Sassar} 22672445Sassar 22772445Sassar#ifdef TEST 22872445Sassar 22972445Sassarvoid 23072445Sassarprint_addr(const char *s, struct sockaddr *sa) 23172445Sassar{ 23272445Sassar int i; 23372445Sassar printf(" %s=%d/", s, sa->sa_family); 23472445Sassar#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN 23572445Sassar for(i = 0; i < sa->sa_len - ((long)sa->sa_data - (long)&sa->sa_family); i++) 23672445Sassar printf("%02x", ((unsigned char*)sa->sa_data)[i]); 23772445Sassar#else 23872445Sassar for(i = 0; i < sizeof(sa->sa_data); i++) 23972445Sassar printf("%02x", ((unsigned char*)sa->sa_data)[i]); 24072445Sassar#endif 24172445Sassar printf("\n"); 24272445Sassar} 24372445Sassar 24472445Sassarvoid 24572445Sassarprint_ifaddrs(struct ifaddrs *x) 24672445Sassar{ 24772445Sassar struct ifaddrs *p; 24872445Sassar 24972445Sassar for(p = x; p; p = p->ifa_next) { 25072445Sassar printf("%s\n", p->ifa_name); 25172445Sassar printf(" flags=%x\n", p->ifa_flags); 25272445Sassar if(p->ifa_addr) 25372445Sassar print_addr("addr", p->ifa_addr); 25472445Sassar if(p->ifa_dstaddr) 25572445Sassar print_addr("dstaddr", p->ifa_dstaddr); 25672445Sassar if(p->ifa_netmask) 25772445Sassar print_addr("netmask", p->ifa_netmask); 25872445Sassar printf(" %p\n", p->ifa_data); 25972445Sassar } 26072445Sassar} 26172445Sassar 26272445Sassarint 26372445Sassarmain() 26472445Sassar{ 26572445Sassar struct ifaddrs *a = NULL, *b; 26672445Sassar getifaddrs2(&a, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, sizeof(struct ifreq)); 26772445Sassar print_ifaddrs(a); 26872445Sassar printf("---\n"); 26972445Sassar getifaddrs(&b); 27072445Sassar print_ifaddrs(b); 27172445Sassar return 0; 27272445Sassar} 27372445Sassar#endif 274