1/* 2 * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ |
3 * $FreeBSD: head/usr.sbin/rpcbind/util.c 293229 2016-01-06 00:00:11Z asomers $ |
4 */ 5 6/*- 7 * Copyright (c) 2000 The NetBSD Foundation, Inc. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Frank van der Linden. --- 39 unchanged lines hidden (view full) --- 51 52#include "rpcbind.h" 53 54static struct sockaddr_in *local_in4; 55#ifdef INET6 56static struct sockaddr_in6 *local_in6; 57#endif 58 |
59static int bitmaskcmp(struct sockaddr *, struct sockaddr *, struct sockaddr *); |
60 61/* 62 * For all bits set in "mask", compare the corresponding bits in 63 * "dst" and "src", and see if they match. Returns 0 if the addresses 64 * match. 65 */ 66static int |
67bitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask) |
68{ 69 int i; |
70 u_int8_t *p1, *p2, *netmask; 71 int bytelen; |
72 |
73 if (dst->sa_family != src->sa_family || 74 dst->sa_family != mask->sa_family) 75 return (1); 76 77 switch (dst->sa_family) { 78 case AF_INET: 79 p1 = (uint8_t*) &SA2SINADDR(dst); 80 p2 = (uint8_t*) &SA2SINADDR(src); 81 netmask = (uint8_t*) &SA2SINADDR(mask); 82 bytelen = sizeof(struct in_addr); 83 break; 84#ifdef INET6 85 case AF_INET6: 86 p1 = (uint8_t*) &SA2SIN6ADDR(dst); 87 p2 = (uint8_t*) &SA2SIN6ADDR(src); 88 netmask = (uint8_t*) &SA2SIN6ADDR(mask); 89 bytelen = sizeof(struct in6_addr); 90 break; 91#endif 92 default: 93 return (1); 94 } 95 |
96 for (i = 0; i < bytelen; i++) 97 if ((p1[i] & netmask[i]) != (p2[i] & netmask[i])) 98 return (1); 99 return (0); 100} 101 102/* 103 * Find a server address that can be used by `caller' to contact 104 * the local service specified by `serv_uaddr'. If `clnt_uaddr' is 105 * non-NULL, it is used instead of `caller' as a hint suggesting 106 * the best address (e.g. the `r_addr' field of an rpc, which 107 * contains the rpcbind server address that the caller used). 108 * 109 * Returns the best server address as a malloc'd "universal address" 110 * string which should be freed by the caller. On error, returns NULL. 111 */ 112char * |
113addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr, 114 const char *netid) |
115{ 116 struct ifaddrs *ifap, *ifp = NULL, *bestif; 117 struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf; 118 struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa; 119 struct sockaddr_storage ss; 120 struct netconfig *nconf; |
121 char *caller_uaddr = NULL; 122 const char *hint_uaddr = NULL; |
123 char *ret = NULL; |
124 int bestif_goodness; |
125 126#ifdef ND_DEBUG 127 if (debugging) 128 fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 129 clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); 130#endif 131 caller_sa = caller->buf; 132 if ((nconf = rpcbind_get_conf(netid)) == NULL) --- 27 unchanged lines hidden (view full) --- 160 ret = strdup(serv_uaddr); 161 goto freeit; 162 } 163 164 if (getifaddrs(&ifp) < 0) 165 goto freeit; 166 167 /* |
168 * Loop through all interface addresses. We are listening to an address 169 * if any of the following are true: 170 * a) It's a loopback address 171 * b) It was specified with the -h command line option 172 * c) There were no -h command line options. 173 * 174 * Among addresses on which we are listening, choose in order of 175 * preference an address that is: 176 * 177 * a) Equal to the hint 178 * b) A link local address with the same scope ID as the client's 179 * address, if the client's address is also link local 180 * c) An address on the same subnet as the client's address 181 * d) A non-localhost, non-p2p address 182 * e) Any usable address |
183 */ 184 bestif = NULL; |
185 bestif_goodness = 0; |
186 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 187 ifsa = ifap->ifa_addr; 188 ifmasksa = ifap->ifa_netmask; 189 |
190 /* Skip addresses where we don't listen */ |
191 if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || 192 !(ifap->ifa_flags & IFF_UP)) 193 continue; 194 195 if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) 196 continue; 197 |
198 if ((hint_sa->sa_family == AF_INET) && 199 ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr == 200 ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) { 201 const int goodness = 4; 202 203 bestif_goodness = goodness; 204 bestif = ifap; 205 goto found; 206 } |
207#ifdef INET6 |
208 if ((hint_sa->sa_family == AF_INET6) && 209 (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr, 210 &((struct sockaddr_in6*)ifsa)->sin6_addr, 211 sizeof(struct in6_addr))) && 212 (((struct sockaddr_in6*)hint_sa)->sin6_scope_id == 213 (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) { 214 const int goodness = 4; 215 216 bestif_goodness = goodness; 217 bestif = ifap; 218 goto found; 219 } 220 if (hint_sa->sa_family == AF_INET6) { |
221 /* 222 * For v6 link local addresses, if the caller is on 223 * a link-local address then use the scope id to see 224 * which one. 225 */ 226 if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && 227 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && 228 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { 229 if (SA2SIN6(ifsa)->sin6_scope_id == 230 SA2SIN6(caller_sa)->sin6_scope_id) { |
231 const int goodness = 3; 232 233 if (bestif_goodness < goodness) { 234 bestif = ifap; 235 bestif_goodness = goodness; 236 } |
237 } |
238 } 239 } 240#endif /* INET6 */ 241 if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) { 242 const int goodness = 2; 243 244 if (bestif_goodness < goodness) { |
245 bestif = ifap; |
246 bestif_goodness = goodness; |
247 } |
248 } |
249 if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 250 const int goodness = 1; |
251 |
252 if (bestif_goodness < goodness) { 253 bestif = ifap; 254 bestif_goodness = goodness; 255 } 256 } 257 if (bestif == NULL) |
258 bestif = ifap; 259 } 260 if (bestif == NULL) 261 goto freeit; 262 263found: 264 /* 265 * Construct the new address using the address from --- 136 unchanged lines hidden --- |