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 0 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)getservent.c 8.1 (Berkeley) 6/4/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #endif 0 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/types.h> 44 #include <sys/socket.h> 45 #include <arpa/inet.h> 46 #include <netdb.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <stdlib.h> 50 #ifdef YP 51 #include <rpc/rpc.h> 52 #include <rpcsvc/yp_prot.h> 53 #include <rpcsvc/ypclnt.h> 54 static int serv_stepping_yp = 0; 55 extern int _yp_check __P(( char ** )); 56 #endif 57 58 59 #define MAXALIASES 35 60 61 static FILE *servf = NULL; 62 static char line[BUFSIZ+1]; 63 static struct servent serv; 64 static char *serv_aliases[MAXALIASES]; 65 int _serv_stayopen; 66 67 #ifdef YP 68 char *___getservbyname_yp = NULL; 69 char *___getservbyproto_yp = NULL; 70 int ___getservbyport_yp = 0; 71 static char *yp_domain = NULL; 72 73 static int 74 _getservbyport_yp(line) 75 char *line; 76 { 77 char *result; 78 int resultlen; 79 char buf[YPMAXRECORD + 2]; 80 int rv; 81 82 snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp), 83 ___getservbyproto_yp); 84 85 ___getservbyport_yp = 0; 86 ___getservbyproto_yp = NULL; 87 88 if(!yp_domain) { 89 if(yp_get_default_domain(&yp_domain)) 90 return (0); 91 } 92 93 /* 94 * We have to be a little flexible here. Ideally you're supposed 95 * to have both a services.byname and a services.byport map, but 96 * some systems have only services.byname. FreeBSD cheats a little 97 * by putting the services.byport information in the same map as 98 * services.byname so that either case will work. We allow for both 99 * possibilities here: if there is no services.byport map, we try 100 * services.byname instead. 101 */ 102 if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf), 103 &result, &resultlen))) { 104 if (rv == YPERR_MAP) { 105 if (yp_match(yp_domain, "services.byname", buf, 106 strlen(buf), &result, &resultlen)) 107 return(0); 108 } else 109 return(0); 110 } 111 112 /* getservent() expects lines terminated with \n -- make it happy */ 113 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 114 115 free(result); 116 return(1); 117 } 118 119 static int 120 _getservbyname_yp(line) 121 char *line; 122 { 123 char *result; 124 int resultlen; 125 char buf[YPMAXRECORD + 2]; 126 127 if(!yp_domain) { 128 if(yp_get_default_domain(&yp_domain)) 129 return (0); 130 } 131 132 snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp, 133 ___getservbyproto_yp); 134 135 ___getservbyname_yp = 0; 136 ___getservbyproto_yp = NULL; 137 138 if (yp_match(yp_domain, "services.byname", buf, strlen(buf), 139 &result, &resultlen)) { 140 return(0); 141 } 142 143 /* getservent() expects lines terminated with \n -- make it happy */ 144 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 145 146 free(result); 147 return(1); 148 } 149 150 static int 151 _getservent_yp(line) 152 char *line; 153 { 154 static char *key = NULL; 155 static int keylen; 156 char *lastkey, *result; 157 int resultlen; 158 int rv; 159 160 if(!yp_domain) { 161 if(yp_get_default_domain(&yp_domain)) 162 return (0); 163 } 164 165 if (!serv_stepping_yp) { 166 if (key) 167 free(key); 168 if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen, 169 &result, &resultlen))) { 170 serv_stepping_yp = 0; 171 return(0); 172 } 173 serv_stepping_yp = 1; 174 } else { 175 lastkey = key; 176 rv = yp_next(yp_domain, "services.byname", key, keylen, &key, 177 &keylen, &result, &resultlen); 178 free(lastkey); 179 if (rv) { 180 serv_stepping_yp = 0; 181 return (0); 182 } 183 } 184 185 /* getservent() expects lines terminated with \n -- make it happy */ 186 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 187 188 free(result); 189 190 return(1); 191 } 192 #endif 193 194 void 195 setservent(f) 196 int f; 197 { 198 if (servf == NULL) 199 servf = fopen(_PATH_SERVICES, "r" ); 200 else 201 rewind(servf); 202 _serv_stayopen |= f; 203 } 204 205 void 206 endservent() 207 { 208 if (servf) { 209 fclose(servf); 210 servf = NULL; 211 } 212 _serv_stayopen = 0; 213 } 214 215 struct servent * 216 getservent() 217 { 218 char *p; 219 register char *cp, **q; 220 221 #ifdef YP 222 if (serv_stepping_yp && _getservent_yp(line)) { 223 p = (char *)&line; 224 goto unpack; 225 } 226 tryagain: 227 #endif 228 if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) 229 return (NULL); 230 again: 231 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 232 return (NULL); 233 #ifdef YP 234 if (*p == '+' && _yp_check(NULL)) { 235 if (___getservbyname_yp != NULL) { 236 if (!_getservbyname_yp(line)) 237 goto tryagain; 238 } 239 else if (___getservbyport_yp != 0) { 240 if (!_getservbyport_yp(line)) 241 goto tryagain; 242 } 243 else if (!_getservent_yp(line)) 244 goto tryagain; 245 } 246 unpack: 247 #endif 248 if (*p == '#') 249 goto again; 250 cp = strpbrk(p, "#\n"); 251 if (cp == NULL) 252 goto again; 253 *cp = '\0'; 254 serv.s_name = p; 255 p = strpbrk(p, " \t"); 256 if (p == NULL) 257 goto again; 258 *p++ = '\0'; 259 while (*p == ' ' || *p == '\t') 260 p++; 261 cp = strpbrk(p, ",/"); 262 if (cp == NULL) 263 goto again; 264 *cp++ = '\0'; 265 serv.s_port = htons((u_short)atoi(p)); 266 serv.s_proto = cp; 267 q = serv.s_aliases = serv_aliases; 268 cp = strpbrk(cp, " \t"); 269 if (cp != NULL) 270 *cp++ = '\0'; 271 while (cp && *cp) { 272 if (*cp == ' ' || *cp == '\t') { 273 cp++; 274 continue; 275 } 276 if (q < &serv_aliases[MAXALIASES - 1]) 277 *q++ = cp; 278 cp = strpbrk(cp, " \t"); 279 if (cp != NULL) 280 *cp++ = '\0'; 281 } 282 *q = NULL; 283 return (&serv); 284 } 285