1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getservent.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/types.h> 41 #include <sys/socket.h> 42 #include <arpa/inet.h> 43 #include <netdb.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <stdlib.h> 47 #ifdef YP 48 #include <rpc/rpc.h> 49 #include <rpcsvc/yp_prot.h> 50 #include <rpcsvc/ypclnt.h> 51 static int serv_stepping_yp = 0; 52 extern int _yp_check( char ** ); 53 #endif 54 55 56 #define MAXALIASES 35 57 58 static FILE *servf = NULL; 59 static char line[BUFSIZ+1]; 60 static struct servent serv; 61 static char *serv_aliases[MAXALIASES]; 62 int _serv_stayopen; 63 64 #ifdef YP 65 char *___getservbyname_yp = NULL; 66 char *___getservbyproto_yp = NULL; 67 int ___getservbyport_yp = 0; 68 static char *yp_domain = NULL; 69 70 static int 71 _getservbyport_yp(line) 72 char *line; 73 { 74 char *result; 75 int resultlen; 76 char buf[YPMAXRECORD + 2]; 77 int rv; 78 79 snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp), 80 ___getservbyproto_yp); 81 82 ___getservbyport_yp = 0; 83 ___getservbyproto_yp = NULL; 84 85 if(!yp_domain) { 86 if(yp_get_default_domain(&yp_domain)) 87 return (0); 88 } 89 90 /* 91 * We have to be a little flexible here. Ideally you're supposed 92 * to have both a services.byname and a services.byport map, but 93 * some systems have only services.byname. FreeBSD cheats a little 94 * by putting the services.byport information in the same map as 95 * services.byname so that either case will work. We allow for both 96 * possibilities here: if there is no services.byport map, we try 97 * services.byname instead. 98 */ 99 if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf), 100 &result, &resultlen))) { 101 if (rv == YPERR_MAP) { 102 if (yp_match(yp_domain, "services.byname", buf, 103 strlen(buf), &result, &resultlen)) 104 return(0); 105 } else 106 return(0); 107 } 108 109 /* getservent() expects lines terminated with \n -- make it happy */ 110 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 111 112 free(result); 113 return(1); 114 } 115 116 static int 117 _getservbyname_yp(line) 118 char *line; 119 { 120 char *result; 121 int resultlen; 122 char buf[YPMAXRECORD + 2]; 123 124 if(!yp_domain) { 125 if(yp_get_default_domain(&yp_domain)) 126 return (0); 127 } 128 129 snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp, 130 ___getservbyproto_yp); 131 132 ___getservbyname_yp = 0; 133 ___getservbyproto_yp = NULL; 134 135 if (yp_match(yp_domain, "services.byname", buf, strlen(buf), 136 &result, &resultlen)) { 137 return(0); 138 } 139 140 /* getservent() expects lines terminated with \n -- make it happy */ 141 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 142 143 free(result); 144 return(1); 145 } 146 147 static int 148 _getservent_yp(line) 149 char *line; 150 { 151 static char *key = NULL; 152 static int keylen; 153 char *lastkey, *result; 154 int resultlen; 155 int rv; 156 157 if(!yp_domain) { 158 if(yp_get_default_domain(&yp_domain)) 159 return (0); 160 } 161 162 if (!serv_stepping_yp) { 163 if (key) 164 free(key); 165 if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen, 166 &result, &resultlen))) { 167 serv_stepping_yp = 0; 168 return(0); 169 } 170 serv_stepping_yp = 1; 171 } else { 172 lastkey = key; 173 rv = yp_next(yp_domain, "services.byname", key, keylen, &key, 174 &keylen, &result, &resultlen); 175 free(lastkey); 176 if (rv) { 177 serv_stepping_yp = 0; 178 return (0); 179 } 180 } 181 182 /* getservent() expects lines terminated with \n -- make it happy */ 183 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 184 185 free(result); 186 187 return(1); 188 } 189 #endif 190 191 void 192 setservent(f) 193 int f; 194 { 195 if (servf == NULL) 196 servf = fopen(_PATH_SERVICES, "r" ); 197 else 198 rewind(servf); 199 _serv_stayopen |= f; 200 } 201 202 void 203 endservent() 204 { 205 if (servf) { 206 fclose(servf); 207 servf = NULL; 208 } 209 _serv_stayopen = 0; 210 } 211 212 struct servent * 213 getservent() 214 { 215 char *p; 216 char *cp, **q; 217 218 #ifdef YP 219 if (serv_stepping_yp && _getservent_yp(line)) { 220 p = (char *)&line; 221 goto unpack; 222 } 223 tryagain: 224 #endif 225 if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) 226 return (NULL); 227 again: 228 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 229 return (NULL); 230 #ifdef YP 231 if (*p == '+' && _yp_check(NULL)) { 232 if (___getservbyname_yp != NULL) { 233 if (!_getservbyname_yp(line)) 234 goto tryagain; 235 } 236 else if (___getservbyport_yp != 0) { 237 if (!_getservbyport_yp(line)) 238 goto tryagain; 239 } 240 else if (!_getservent_yp(line)) 241 goto tryagain; 242 } 243 unpack: 244 #endif 245 if (*p == '#') 246 goto again; 247 cp = strpbrk(p, "#\n"); 248 if (cp == NULL) 249 goto again; 250 *cp = '\0'; 251 serv.s_name = p; 252 p = strpbrk(p, " \t"); 253 if (p == NULL) 254 goto again; 255 *p++ = '\0'; 256 while (*p == ' ' || *p == '\t') 257 p++; 258 cp = strpbrk(p, ",/"); 259 if (cp == NULL) 260 goto again; 261 *cp++ = '\0'; 262 serv.s_port = htons((u_short)atoi(p)); 263 serv.s_proto = cp; 264 q = serv.s_aliases = serv_aliases; 265 cp = strpbrk(cp, " \t"); 266 if (cp != NULL) 267 *cp++ = '\0'; 268 while (cp && *cp) { 269 if (*cp == ' ' || *cp == '\t') { 270 cp++; 271 continue; 272 } 273 if (q < &serv_aliases[MAXALIASES - 1]) 274 *q++ = cp; 275 cp = strpbrk(cp, " \t"); 276 if (cp != NULL) 277 *cp++ = '\0'; 278 } 279 *q = NULL; 280 return (&serv); 281 } 282