1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user or with the express written consent of 8 * Sun Microsystems, Inc. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 * 30 * $FreeBSD: src/lib/libc/rpc/netnamer.c,v 1.3.6.1 2000/09/20 04:43:11 jkh Exp $ 31 * $DragonFly: src/lib/libc/rpc/netnamer.c,v 1.3 2003/11/12 20:21:25 eirikn Exp $ 32 * 33 * @(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro 34 */ 35 /* 36 * netname utility routines convert from unix names to network names and 37 * vice-versa This module is operating system dependent! What we define here 38 * will work with any unix system that has adopted the sun NIS domain 39 * architecture. 40 */ 41 #include <sys/param.h> 42 #include <rpc/rpc.h> 43 #include <rpc/rpc_com.h> 44 #ifdef YP 45 #include <rpcsvc/yp_prot.h> 46 #include <rpcsvc/ypclnt.h> 47 #endif 48 #include <ctype.h> 49 #include <stdio.h> 50 #include <grp.h> 51 #include <pwd.h> 52 #include <string.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 static char *OPSYS = "unix"; 57 static char *NETID = "netid.byname"; 58 static char *NETIDFILE = "/etc/netid"; 59 60 static int getnetid ( char *, char * ); 61 static int _getgroups ( char *, gid_t * ); 62 63 #ifndef NGROUPS 64 #define NGROUPS 16 65 #endif 66 67 /* 68 * Convert network-name into unix credential 69 */ 70 int 71 netname2user(netname, uidp, gidp, gidlenp, gidlist) 72 char netname[MAXNETNAMELEN + 1]; 73 uid_t *uidp; 74 gid_t *gidp; 75 int *gidlenp; 76 gid_t *gidlist; 77 { 78 char *p; 79 int gidlen; 80 uid_t uid; 81 long luid; 82 struct passwd *pwd; 83 char val[1024]; 84 char *val1, *val2; 85 char *domain; 86 int vallen; 87 int err; 88 89 if (getnetid(netname, val)) { 90 char *res = val; 91 92 p = strsep(&res, ":"); 93 if (p == NULL) 94 return (0); 95 *uidp = (uid_t) atol(p); 96 p = strsep(&res, "\n,"); 97 if (p == NULL) { 98 return (0); 99 } 100 *gidp = (gid_t) atol(p); 101 gidlen = 0; 102 for (gidlen = 0; gidlen < NGROUPS; gidlen++) { 103 p = strsep(&res, "\n,"); 104 if (p == NULL) 105 break; 106 gidlist[gidlen] = (gid_t) atol(p); 107 } 108 *gidlenp = gidlen; 109 110 return (1); 111 } 112 val1 = strchr(netname, '.'); 113 if (val1 == NULL) 114 return (0); 115 if (strncmp(netname, OPSYS, (val1-netname))) 116 return (0); 117 val1++; 118 val2 = strchr(val1, '@'); 119 if (val2 == NULL) 120 return (0); 121 vallen = val2 - val1; 122 if (vallen > (1024 - 1)) 123 vallen = 1024 - 1; 124 (void) strncpy(val, val1, 1024); 125 val[vallen] = 0; 126 127 err = _rpc_get_default_domain(&domain); /* change to rpc */ 128 if (err) 129 return (0); 130 131 if (strcmp(val2 + 1, domain)) 132 return (0); /* wrong domain */ 133 134 if (sscanf(val, "%ld", &luid) != 1) 135 return (0); 136 uid = luid; 137 138 /* use initgroups method */ 139 pwd = getpwuid(uid); 140 if (pwd == NULL) 141 return (0); 142 *uidp = pwd->pw_uid; 143 *gidp = pwd->pw_gid; 144 *gidlenp = _getgroups(pwd->pw_name, gidlist); 145 return (1); 146 } 147 148 /* 149 * initgroups 150 */ 151 152 static int 153 _getgroups(uname, groups) 154 char *uname; 155 gid_t groups[NGROUPS]; 156 { 157 gid_t ngroups = 0; 158 register struct group *grp; 159 register int i; 160 register int j; 161 int filter; 162 163 setgrent(); 164 while ((grp = getgrent())) { 165 for (i = 0; grp->gr_mem[i]; i++) 166 if (!strcmp(grp->gr_mem[i], uname)) { 167 if (ngroups == NGROUPS) { 168 #ifdef DEBUG 169 fprintf(stderr, 170 "initgroups: %s is in too many groups\n", uname); 171 #endif 172 goto toomany; 173 } 174 /* filter out duplicate group entries */ 175 filter = 0; 176 for (j = 0; j < ngroups; j++) 177 if (groups[j] == grp->gr_gid) { 178 filter++; 179 break; 180 } 181 if (!filter) 182 groups[ngroups++] = grp->gr_gid; 183 } 184 } 185 toomany: 186 endgrent(); 187 return (ngroups); 188 } 189 190 /* 191 * Convert network-name to hostname 192 */ 193 int 194 netname2host(netname, hostname, hostlen) 195 char netname[MAXNETNAMELEN + 1]; 196 char *hostname; 197 int hostlen; 198 { 199 int err; 200 char valbuf[1024]; 201 char *val; 202 char *val2; 203 int vallen; 204 char *domain; 205 206 if (getnetid(netname, valbuf)) { 207 val = valbuf; 208 if ((*val == '0') && (val[1] == ':')) { 209 (void) strncpy(hostname, val + 2, hostlen); 210 return (1); 211 } 212 } 213 val = strchr(netname, '.'); 214 if (val == NULL) 215 return (0); 216 if (strncmp(netname, OPSYS, (val - netname))) 217 return (0); 218 val++; 219 val2 = strchr(val, '@'); 220 if (val2 == NULL) 221 return (0); 222 vallen = val2 - val; 223 if (vallen > (hostlen - 1)) 224 vallen = hostlen - 1; 225 (void) strncpy(hostname, val, vallen); 226 hostname[vallen] = 0; 227 228 err = _rpc_get_default_domain(&domain); /* change to rpc */ 229 if (err) 230 return (0); 231 232 if (strcmp(val2 + 1, domain)) 233 return (0); /* wrong domain */ 234 else 235 return (1); 236 } 237 238 /* 239 * reads the file /etc/netid looking for a + to optionally go to the 240 * network information service. 241 */ 242 int 243 getnetid(key, ret) 244 char *key, *ret; 245 { 246 char buf[1024]; /* big enough */ 247 char *res; 248 char *mkey; 249 char *mval; 250 FILE *fd; 251 #ifdef YP 252 char *domain; 253 int err; 254 char *lookup; 255 int len; 256 #endif 257 258 fd = fopen(NETIDFILE, "r"); 259 if (fd == NULL) { 260 #ifdef YP 261 res = "+"; 262 goto getnetidyp; 263 #else 264 return (0); 265 #endif 266 } 267 for (;;) { 268 if (fd == NULL) 269 return (0); /* getnetidyp brings us here */ 270 res = fgets(buf, sizeof(buf), fd); 271 if (res == NULL) { 272 fclose(fd); 273 return (0); 274 } 275 if (res[0] == '#') 276 continue; 277 else if (res[0] == '+') { 278 #ifdef YP 279 getnetidyp: 280 err = yp_get_default_domain(&domain); 281 if (err) { 282 continue; 283 } 284 lookup = NULL; 285 err = yp_match(domain, NETID, key, 286 strlen(key), &lookup, &len); 287 if (err) { 288 #ifdef DEBUG 289 fprintf(stderr, "match failed error %d\n", err); 290 #endif 291 continue; 292 } 293 lookup[len] = 0; 294 strcpy(ret, lookup); 295 free(lookup); 296 if (fd != NULL) 297 fclose(fd); 298 return (2); 299 #else /* YP */ 300 #ifdef DEBUG 301 fprintf(stderr, 302 "Bad record in %s '+' -- NIS not supported in this library copy\n", 303 NETIDFILE); 304 #endif 305 continue; 306 #endif /* YP */ 307 } else { 308 mkey = strsep(&res, "\t "); 309 if (mkey == NULL) { 310 fprintf(stderr, 311 "Bad record in %s -- %s", NETIDFILE, buf); 312 continue; 313 } 314 do { 315 mval = strsep(&res, " \t#\n"); 316 } while (mval != NULL && !*mval); 317 if (mval == NULL) { 318 fprintf(stderr, 319 "Bad record in %s val problem - %s", NETIDFILE, buf); 320 continue; 321 } 322 if (strcmp(mkey, key) == 0) { 323 strcpy(ret, mval); 324 fclose(fd); 325 return (1); 326 327 } 328 } 329 } 330 } 331