/* * Copyright (c) 1985, 1988 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that: (1) source distributions retain this entire copyright * notice and comment, and (2) distributions including binaries display * the following acknowledgement: ``This product includes software * developed by the University of California, Berkeley and its contributors'' * in the documentation or other materials provided with the distribution * and in all advertising materials mentioning features or use of this * software. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)gethostnamadr.c 6.41 (Berkeley) 6/1/90"; #endif /* LIBC_SCCS and not lint */ /* Prefix the functions defined here with underscores to distinguish them * from the newer replacements in the resolver library. */ #define sethostent _sethostent #define endhostent _endhostent #define gethostent _gethostent #define gethostbyname _gethostbyname #define gethostbyaddr _gethostbyaddr #ifdef _MINIX #include <sys/types.h> #include <ctype.h> #include <errno.h> #include <stdio.h> #include <string.h> #include <net/hton.h> #include <net/gen/nameser.h> #include <net/gen/netdb.h> #include <net/gen/in.h> #include <net/gen/inet.h> #include <net/gen/resolv.h> #include <net/gen/socket.h> #else #include <sys/param.h> #include <sys/socket.h> #include <netinet/in.h> #include <ctype.h> #include <netdb.h> #include <stdio.h> #include <errno.h> #include <arpa/inet.h> #include <arpa/nameser.h> #include <resolv.h> #endif /* !_MINIX */ #define MAXALIASES 35 #define MAXADDRS 35 #ifdef _MINIX typedef u32_t u_long; typedef u16_t u_short; typedef u8_t u_char; #define bcmp memcmp #endif /* _MINIX */ static struct hostent host; static char *host_aliases[MAXALIASES]; static char hostbuf[BUFSIZ+1]; static FILE *hostf = NULL; static u_long hostaddr[(MAXADDRS+sizeof(u_long)-1)/sizeof(u_long)]; static char *host_addrs[2]; static int stayopen = 0; #ifndef _MINIX char *strpbrk(); #endif /* !_MINIX */ void sethostent(f) int f; { if (hostf == NULL) hostf = fopen(_PATH_HOSTS, "r" ); else rewind(hostf); stayopen |= f; } void endhostent() { if (hostf && !stayopen) { (void) fclose(hostf); hostf = NULL; } } struct hostent * gethostent() { char *p; register char *cp, **q; if (hostf == NULL && (hostf = fopen(_PATH_HOSTS, "r" )) == NULL) return (NULL); again: if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL) return (NULL); if (*p == '#') goto again; cp = strpbrk(p, "#\n"); if (cp == NULL) goto again; *cp = '\0'; cp = strpbrk(p, " \t"); if (cp == NULL) goto again; *cp++ = '\0'; /* THIS STUFF IS INTERNET SPECIFIC */ #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ host.h_addr_list = host_addrs; #endif host.h_addr = (char *) hostaddr; *((u_long *)host.h_addr) = inet_addr(p); host.h_length = sizeof (u_long); host.h_addrtype = AF_INET; while (*cp == ' ' || *cp == '\t') cp++; host.h_name = cp; q = host.h_aliases = host_aliases; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q < &host_aliases[MAXALIASES - 1]) *q++ = cp; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; } *q = NULL; return (&host); } struct hostent * gethostbyname(name) char *name; { register struct hostent *p; register char **cp; sethostent(0); while (p = gethostent()) { if (strcasecmp(p->h_name, name) == 0) break; for (cp = p->h_aliases; *cp != 0; cp++) if (strcasecmp(*cp, name) == 0) goto found; } found: endhostent(); return (p); } struct hostent * gethostbyaddr(addr, len, type) const char *addr; int len, type; { register struct hostent *p; sethostent(0); while (p = gethostent()) if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len)) break; endhostent(); return (p); }