1/* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996,1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#if defined(LIBC_SCCS) && !defined(lint) 19static const char rcsid[] = "$Id: nis_nw.c,v 1.4 2005/04/27 04:56:33 sra Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21 22/* Imports */ 23 24#include "port_before.h" 25 26#ifndef WANT_IRS_NIS 27static int __bind_irs_nis_unneeded; 28#else 29 30#include <sys/types.h> 31#include <sys/socket.h> 32 33#include <netinet/in.h> 34#include <arpa/inet.h> 35#include <arpa/nameser.h> 36#ifdef T_NULL 37#undef T_NULL /* Silence re-definition warning of T_NULL. */ 38#endif 39#include <rpc/rpc.h> 40#include <rpc/xdr.h> 41#include <rpcsvc/yp_prot.h> 42#include <rpcsvc/ypclnt.h> 43 44#include <errno.h> 45#include <resolv.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49 50#include <isc/memcluster.h> 51#include <irs.h> 52 53#include "port_after.h" 54 55#include "irs_p.h" 56#include "nis_p.h" 57 58/* Definitions */ 59 60#define MAXALIASES 35 61#define MAXADDRSIZE 4 62 63struct pvt { 64 int needrewind; 65 char * nis_domain; 66 char * curkey_data; 67 int curkey_len; 68 char * curval_data; 69 int curval_len; 70 71 struct nwent nwent; 72 char * nwbuf; 73 74 char * aliases[MAXALIASES + 1]; 75 u_char addr[MAXADDRSIZE]; 76 77 struct __res_state * res; 78 void (*free_res)(void *); 79}; 80 81enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 }; 82 83static /*const*/ char networks_byname[] = "networks.byname"; 84static /*const*/ char networks_byaddr[] = "networks.byaddr"; 85 86/* Forward */ 87 88static void nw_close(struct irs_nw *); 89static struct nwent * nw_byname(struct irs_nw *, const char *, int); 90static struct nwent * nw_byaddr(struct irs_nw *, void *, int, int); 91static struct nwent * nw_next(struct irs_nw *); 92static void nw_rewind(struct irs_nw *); 93static void nw_minimize(struct irs_nw *); 94static struct __res_state * nw_res_get(struct irs_nw *this); 95static void nw_res_set(struct irs_nw *this, 96 struct __res_state *res, 97 void (*free_res)(void *)); 98 99static struct nwent * makenwent(struct irs_nw *this); 100static void nisfree(struct pvt *, enum do_what); 101static int init(struct irs_nw *this); 102 103/* Public */ 104 105struct irs_nw * 106irs_nis_nw(struct irs_acc *this) { 107 struct irs_nw *nw; 108 struct pvt *pvt; 109 110 if (!(pvt = memget(sizeof *pvt))) { 111 errno = ENOMEM; 112 return (NULL); 113 } 114 memset(pvt, 0, sizeof *pvt); 115 if (!(nw = memget(sizeof *nw))) { 116 memput(pvt, sizeof *pvt); 117 errno = ENOMEM; 118 return (NULL); 119 } 120 memset(nw, 0x5e, sizeof *nw); 121 pvt->needrewind = 1; 122 pvt->nis_domain = ((struct nis_p *)this->private)->domain; 123 nw->private = pvt; 124 nw->close = nw_close; 125 nw->byname = nw_byname; 126 nw->byaddr = nw_byaddr; 127 nw->next = nw_next; 128 nw->rewind = nw_rewind; 129 nw->minimize = nw_minimize; 130 nw->res_get = nw_res_get; 131 nw->res_set = nw_res_set; 132 return (nw); 133} 134 135/* Methods */ 136 137static void 138nw_close(struct irs_nw *this) { 139 struct pvt *pvt = (struct pvt *)this->private; 140 141 nw_minimize(this); 142 if (pvt->res && pvt->free_res) 143 (*pvt->free_res)(pvt->res); 144 if (pvt->nwbuf) 145 free(pvt->nwbuf); 146 memput(pvt, sizeof *pvt); 147 memput(this, sizeof *this); 148} 149 150static struct nwent * 151nw_byaddr(struct irs_nw *this, void *net, int length, int af) { 152 struct pvt *pvt = (struct pvt *)this->private; 153 char tmp[sizeof "255.255.255.255/32"], *t; 154 int r; 155 156 if (init(this) == -1) 157 return (NULL); 158 159 if (af != AF_INET) { 160 RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL); 161 errno = EAFNOSUPPORT; 162 return (NULL); 163 } 164 nisfree(pvt, do_val); 165 /* Try it with /CIDR first. */ 166 if (inet_net_ntop(AF_INET, net, length, tmp, sizeof tmp) == NULL) { 167 RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL); 168 return (NULL); 169 } 170 r = yp_match(pvt->nis_domain, networks_byaddr, tmp, strlen(tmp), 171 &pvt->curval_data, &pvt->curval_len); 172 if (r != 0) { 173 /* Give it a shot without the /CIDR. */ 174 if ((t = strchr(tmp, '/')) != NULL) { 175 *t = '\0'; 176 r = yp_match(pvt->nis_domain, networks_byaddr, 177 tmp, strlen(tmp), 178 &pvt->curval_data, &pvt->curval_len); 179 } 180 if (r != 0) { 181 RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND); 182 return (NULL); 183 } 184 } 185 return (makenwent(this)); 186} 187 188static struct nwent * 189nw_byname(struct irs_nw *this, const char *name, int af) { 190 struct pvt *pvt = (struct pvt *)this->private; 191 int r; 192 char *tmp; 193 194 if (init(this) == -1) 195 return (NULL); 196 197 if (af != AF_INET) { 198 RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL); 199 errno = EAFNOSUPPORT; 200 return (NULL); 201 } 202 nisfree(pvt, do_val); 203 DE_CONST(name, tmp); 204 r = yp_match(pvt->nis_domain, networks_byname, tmp, 205 strlen(tmp), &pvt->curval_data, &pvt->curval_len); 206 if (r != 0) { 207 RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND); 208 return (NULL); 209 } 210 return (makenwent(this)); 211} 212 213static void 214nw_rewind(struct irs_nw *this) { 215 struct pvt *pvt = (struct pvt *)this->private; 216 217 pvt->needrewind = 1; 218} 219 220static struct nwent * 221nw_next(struct irs_nw *this) { 222 struct pvt *pvt = (struct pvt *)this->private; 223 struct nwent *rval; 224 int r; 225 226 if (init(this) == -1) 227 return (NULL); 228 229 do { 230 if (pvt->needrewind) { 231 nisfree(pvt, do_all); 232 r = yp_first(pvt->nis_domain, networks_byaddr, 233 &pvt->curkey_data, &pvt->curkey_len, 234 &pvt->curval_data, &pvt->curval_len); 235 pvt->needrewind = 0; 236 } else { 237 char *newkey_data; 238 int newkey_len; 239 240 nisfree(pvt, do_val); 241 r = yp_next(pvt->nis_domain, networks_byaddr, 242 pvt->curkey_data, pvt->curkey_len, 243 &newkey_data, &newkey_len, 244 &pvt->curval_data, &pvt->curval_len); 245 nisfree(pvt, do_key); 246 pvt->curkey_data = newkey_data; 247 pvt->curkey_len = newkey_len; 248 } 249 if (r != 0) { 250 RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND); 251 return (NULL); 252 } 253 rval = makenwent(this); 254 } while (rval == NULL); 255 return (rval); 256} 257 258static void 259nw_minimize(struct irs_nw *this) { 260 struct pvt *pvt = (struct pvt *)this->private; 261 262 if (pvt->res) 263 res_nclose(pvt->res); 264} 265 266static struct __res_state * 267nw_res_get(struct irs_nw *this) { 268 struct pvt *pvt = (struct pvt *)this->private; 269 270 if (!pvt->res) { 271 struct __res_state *res; 272 res = (struct __res_state *)malloc(sizeof *res); 273 if (!res) { 274 errno = ENOMEM; 275 return (NULL); 276 } 277 memset(res, 0, sizeof *res); 278 nw_res_set(this, res, free); 279 } 280 281 return (pvt->res); 282} 283 284static void 285nw_res_set(struct irs_nw *this, struct __res_state *res, 286 void (*free_res)(void *)) { 287 struct pvt *pvt = (struct pvt *)this->private; 288 289 if (pvt->res && pvt->free_res) { 290 res_nclose(pvt->res); 291 (*pvt->free_res)(pvt->res); 292 } 293 294 pvt->res = res; 295 pvt->free_res = free_res; 296} 297 298/* Private */ 299 300static struct nwent * 301makenwent(struct irs_nw *this) { 302 struct pvt *pvt = (struct pvt *)this->private; 303 static const char spaces[] = " \t"; 304 char *t, *cp, **ap; 305 306 if (pvt->nwbuf) 307 free(pvt->nwbuf); 308 pvt->nwbuf = pvt->curval_data; 309 pvt->curval_data = NULL; 310 311 if ((cp = strpbrk(pvt->nwbuf, "#\n")) != NULL) 312 *cp = '\0'; 313 cp = pvt->nwbuf; 314 315 /* Name */ 316 pvt->nwent.n_name = cp; 317 cp += strcspn(cp, spaces); 318 if (!*cp) 319 goto cleanup; 320 *cp++ = '\0'; 321 cp += strspn(cp, spaces); 322 323 /* Network */ 324 pvt->nwent.n_addrtype = AF_INET; 325 t = cp + strcspn(cp, spaces); 326 if (*t) 327 *t++ = '\0'; 328 pvt->nwent.n_length = inet_net_pton(AF_INET, cp, 329 pvt->addr, sizeof pvt->addr); 330 if (pvt->nwent.n_length < 0) 331 goto cleanup; 332 pvt->nwent.n_addr = pvt->addr; 333 cp = t; 334 335 /* Aliases */ 336 ap = pvt->nwent.n_aliases = pvt->aliases; 337 while (*cp) { 338 if (ap >= &pvt->aliases[MAXALIASES]) 339 break; 340 *ap++ = cp; 341 cp += strcspn(cp, spaces); 342 if (!*cp) 343 break; 344 *cp++ = '\0'; 345 cp += strspn(cp, spaces); 346 } 347 *ap = NULL; 348 349 return (&pvt->nwent); 350 351 cleanup: 352 if (pvt->nwbuf) { 353 free(pvt->nwbuf); 354 pvt->nwbuf = NULL; 355 } 356 return (NULL); 357} 358 359static void 360nisfree(struct pvt *pvt, enum do_what do_what) { 361 if ((do_what & do_key) && pvt->curkey_data) { 362 free(pvt->curkey_data); 363 pvt->curkey_data = NULL; 364 } 365 if ((do_what & do_val) && pvt->curval_data) { 366 free(pvt->curval_data); 367 pvt->curval_data = NULL; 368 } 369} 370 371static int 372init(struct irs_nw *this) { 373 struct pvt *pvt = (struct pvt *)this->private; 374 375 if (!pvt->res && !nw_res_get(this)) 376 return (-1); 377 if (((pvt->res->options & RES_INIT) == 0) && 378 res_ninit(pvt->res) == -1) 379 return (-1); 380 return (0); 381} 382 383#endif /*WANT_IRS_NIS*/ 384 385/*! \file */ 386