1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)getservent.c 5.1 (Berkeley) 05/30/85"; 9 #endif not lint 10 11 #include <stdio.h> 12 #include <sys/types.h> 13 #include <sys/socket.h> 14 #include <netdb.h> 15 #include <ctype.h> 16 17 #define MAXALIASES 35 18 19 static char SERVDB[] = "/etc/services"; 20 static FILE *servf = NULL; 21 static char line[BUFSIZ+1]; 22 static struct servent serv; 23 static char *serv_aliases[MAXALIASES]; 24 static int stayopen = 0; 25 static char *any(); 26 27 setservent(f) 28 int f; 29 { 30 if (servf == NULL) 31 servf = fopen(SERVDB, "r" ); 32 else 33 rewind(servf); 34 stayopen |= f; 35 } 36 37 endservent() 38 { 39 if (servf && !stayopen) { 40 fclose(servf); 41 servf = NULL; 42 } 43 } 44 45 struct servent * 46 getservent() 47 { 48 char *p; 49 register char *cp, **q; 50 51 if (servf == NULL && (servf = fopen(SERVDB, "r" )) == NULL) 52 return (NULL); 53 again: 54 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 55 return (NULL); 56 if (*p == '#') 57 goto again; 58 cp = any(p, "#\n"); 59 if (cp == NULL) 60 goto again; 61 *cp = '\0'; 62 serv.s_name = p; 63 p = any(p, " \t"); 64 if (p == NULL) 65 goto again; 66 *p++ = '\0'; 67 while (*p == ' ' || *p == '\t') 68 p++; 69 cp = any(p, ",/"); 70 if (cp == NULL) 71 goto again; 72 *cp++ = '\0'; 73 serv.s_port = htons((u_short)atoi(p)); 74 serv.s_proto = cp; 75 q = serv.s_aliases = serv_aliases; 76 cp = any(cp, " \t"); 77 if (cp != NULL) 78 *cp++ = '\0'; 79 while (cp && *cp) { 80 if (*cp == ' ' || *cp == '\t') { 81 cp++; 82 continue; 83 } 84 if (q < &serv_aliases[MAXALIASES - 1]) 85 *q++ = cp; 86 cp = any(cp, " \t"); 87 if (cp != NULL) 88 *cp++ = '\0'; 89 } 90 *q = NULL; 91 return (&serv); 92 } 93 94 static char * 95 any(cp, match) 96 register char *cp; 97 char *match; 98 { 99 register char *mp, c; 100 101 while (c = *cp) { 102 for (mp = match; *mp; mp++) 103 if (*mp == c) 104 return (cp); 105 cp++; 106 } 107 return ((char *)0); 108 } 109