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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getservent.c 8.1 (Berkeley) 6/4/93 30 * $DragonFly: src/lib/libc/net/getservent.c,v 1.6 2005/09/19 09:34:53 asmodai Exp $ 31 */ 32 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <netdb.h> 36 #include <stdio.h> 37 #include <string.h> 38 #include <stdlib.h> 39 #ifdef YP 40 #include <rpc/rpc.h> 41 #include <rpcsvc/yp_prot.h> 42 #include <rpcsvc/ypclnt.h> 43 static int serv_stepping_yp = 0; 44 extern int _yp_check ( char ** ); 45 #endif 46 47 48 #define MAXALIASES 35 49 50 static FILE *servf = NULL; 51 static char line[BUFSIZ+1]; 52 static struct servent serv; 53 static char *serv_aliases[MAXALIASES]; 54 int _serv_stayopen; 55 56 #ifdef YP 57 char *___getservbyname_yp = NULL; 58 char *___getservbyproto_yp = NULL; 59 int ___getservbyport_yp = 0; 60 static char *yp_domain = NULL; 61 62 static int 63 _getservbyport_yp(line) 64 char *line; 65 { 66 char *result; 67 int resultlen; 68 char buf[YPMAXRECORD + 2]; 69 int rv; 70 71 snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp), 72 ___getservbyproto_yp); 73 74 ___getservbyport_yp = 0; 75 ___getservbyproto_yp = NULL; 76 77 if(!yp_domain) { 78 if(yp_get_default_domain(&yp_domain)) 79 return (0); 80 } 81 82 /* 83 * We have to be a little flexible here. Ideally you're supposed 84 * to have both a services.byname and a services.byport map, but 85 * some systems have only services.byname. FreeBSD cheats a little 86 * by putting the services.byport information in the same map as 87 * services.byname so that either case will work. We allow for both 88 * possibilities here: if there is no services.byport map, we try 89 * services.byname instead. 90 */ 91 if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf), 92 &result, &resultlen))) { 93 if (rv == YPERR_MAP) { 94 if (yp_match(yp_domain, "services.byname", buf, 95 strlen(buf), &result, &resultlen)) 96 return(0); 97 } else 98 return(0); 99 } 100 101 /* getservent() expects lines terminated with \n -- make it happy */ 102 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 103 104 free(result); 105 return(1); 106 } 107 108 static int 109 _getservbyname_yp(line) 110 char *line; 111 { 112 char *result; 113 int resultlen; 114 char buf[YPMAXRECORD + 2]; 115 116 if(!yp_domain) { 117 if(yp_get_default_domain(&yp_domain)) 118 return (0); 119 } 120 121 snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp, 122 ___getservbyproto_yp); 123 124 ___getservbyname_yp = 0; 125 ___getservbyproto_yp = NULL; 126 127 if (yp_match(yp_domain, "services.byname", buf, strlen(buf), 128 &result, &resultlen)) { 129 return(0); 130 } 131 132 /* getservent() expects lines terminated with \n -- make it happy */ 133 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 134 135 free(result); 136 return(1); 137 } 138 139 static int 140 _getservent_yp(line) 141 char *line; 142 { 143 static char *key = NULL; 144 static int keylen; 145 char *lastkey, *result; 146 int resultlen; 147 int rv; 148 149 if(!yp_domain) { 150 if(yp_get_default_domain(&yp_domain)) 151 return (0); 152 } 153 154 if (!serv_stepping_yp) { 155 if (key) 156 free(key); 157 if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen, 158 &result, &resultlen))) { 159 serv_stepping_yp = 0; 160 return(0); 161 } 162 serv_stepping_yp = 1; 163 } else { 164 lastkey = key; 165 rv = yp_next(yp_domain, "services.byname", key, keylen, &key, 166 &keylen, &result, &resultlen); 167 free(lastkey); 168 if (rv) { 169 serv_stepping_yp = 0; 170 return (0); 171 } 172 } 173 174 /* getservent() expects lines terminated with \n -- make it happy */ 175 snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); 176 177 free(result); 178 179 return(1); 180 } 181 #endif 182 183 void 184 setservent(f) 185 int f; 186 { 187 if (servf == NULL) 188 servf = fopen(_PATH_SERVICES, "r" ); 189 else 190 rewind(servf); 191 _serv_stayopen |= f; 192 } 193 194 void 195 endservent() 196 { 197 if (servf) { 198 fclose(servf); 199 servf = NULL; 200 } 201 _serv_stayopen = 0; 202 } 203 204 struct servent * 205 getservent() 206 { 207 char *p; 208 char *cp, **q; 209 210 #ifdef YP 211 if (serv_stepping_yp && _getservent_yp(line)) { 212 p = (char *)&line; 213 goto unpack; 214 } 215 tryagain: 216 #endif 217 if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) 218 return (NULL); 219 again: 220 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 221 return (NULL); 222 #ifdef YP 223 if (*p == '+' && _yp_check(NULL)) { 224 if (___getservbyname_yp != NULL) { 225 if (!_getservbyname_yp(line)) 226 goto tryagain; 227 } 228 else if (___getservbyport_yp != 0) { 229 if (!_getservbyport_yp(line)) 230 goto tryagain; 231 } 232 else if (!_getservent_yp(line)) 233 goto tryagain; 234 } 235 unpack: 236 #endif 237 if (*p == '#') 238 goto again; 239 cp = strpbrk(p, "#\n"); 240 if (cp == NULL) 241 goto again; 242 *cp = '\0'; 243 serv.s_name = p; 244 p = strpbrk(p, " \t"); 245 if (p == NULL) 246 goto again; 247 *p++ = '\0'; 248 while (*p == ' ' || *p == '\t') 249 p++; 250 cp = strpbrk(p, ",/"); 251 if (cp == NULL) 252 goto again; 253 *cp++ = '\0'; 254 serv.s_port = htons((u_short)atoi(p)); 255 serv.s_proto = cp; 256 q = serv.s_aliases = serv_aliases; 257 cp = strpbrk(cp, " \t"); 258 if (cp != NULL) 259 *cp++ = '\0'; 260 while (cp && *cp) { 261 if (*cp == ' ' || *cp == '\t') { 262 cp++; 263 continue; 264 } 265 if (q < &serv_aliases[MAXALIASES - 1]) 266 *q++ = cp; 267 cp = strpbrk(cp, " \t"); 268 if (cp != NULL) 269 *cp++ = '\0'; 270 } 271 *q = NULL; 272 return (&serv); 273 } 274