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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: getservent.c,v 1.6 2003/06/02 20:18:35 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 #include <netdb.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 41 #define MAXALIASES 35 42 43 static FILE *servf = NULL; 44 static char line[BUFSIZ+1]; 45 static struct servent serv; 46 static char *serv_aliases[MAXALIASES]; 47 int _serv_stayopen; 48 49 void 50 setservent(f) 51 int f; 52 { 53 if (servf == NULL) 54 servf = fopen(_PATH_SERVICES, "r" ); 55 else 56 rewind(servf); 57 _serv_stayopen |= f; 58 } 59 60 void 61 endservent() 62 { 63 if (servf) { 64 fclose(servf); 65 servf = NULL; 66 } 67 _serv_stayopen = 0; 68 } 69 70 struct servent * 71 getservent() 72 { 73 char *p, *cp, **q, *endp; 74 long l; 75 size_t len; 76 77 if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) 78 return (NULL); 79 again: 80 if ((p = fgetln(servf, &len)) == NULL) 81 return (NULL); 82 if (p[len-1] == '\n') 83 len--; 84 if (len >= sizeof(line) || len == 0) 85 goto again; 86 p = memcpy(line, p, len); 87 line[len] = '\0'; 88 if (*p == '#') 89 goto again; 90 if ((cp = strchr(p, '#')) != NULL) 91 *cp = '\0'; 92 serv.s_name = p; 93 p = strpbrk(p, " \t"); 94 if (p == NULL) 95 goto again; 96 *p++ = '\0'; 97 while (*p == ' ' || *p == '\t') 98 p++; 99 cp = strpbrk(p, ",/"); 100 if (cp == NULL) 101 goto again; 102 *cp++ = '\0'; 103 l = strtol(p, &endp, 10); 104 if (endp == p || *endp != '\0' || l < 0 || l > USHRT_MAX) 105 goto again; 106 serv.s_port = htons((in_port_t)l); 107 serv.s_proto = cp; 108 q = serv.s_aliases = serv_aliases; 109 cp = strpbrk(cp, " \t"); 110 if (cp != NULL) 111 *cp++ = '\0'; 112 while (cp && *cp) { 113 if (*cp == ' ' || *cp == '\t') { 114 cp++; 115 continue; 116 } 117 if (q < &serv_aliases[MAXALIASES - 1]) 118 *q++ = cp; 119 cp = strpbrk(cp, " \t"); 120 if (cp != NULL) 121 *cp++ = '\0'; 122 } 123 *q = NULL; 124 return (&serv); 125 } 126