/* $XConsortium: xhost.c,v 11.62 94/04/17 20:23:18 rws Exp $ */ /* $XFree86: xc/programs/xhost/xhost.c,v 3.0 1994/04/28 12:45:28 dawes Exp $ */ /* Copyright (c) 1985, 1986, 1987 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. */ #if defined(TCPCONN) || defined(STREAMSCONN) || defined(AMTCPCONN) #define NEEDSOCKETS #endif #ifdef UNIXCONN #define NEEDSOCKETS #endif #ifdef DNETCONN #define NEEDSOCKETS #endif #include #include #include #include #include #include #include #include #include #include #ifdef NEEDSOCKETS #ifdef att typedef unsigned short unsign16; typedef unsigned long unsign32; typedef short sign16; typedef long sign32; #include #include #include #else #ifndef AMOEBA #include #include #include #else #include #include #include #include #include #endif #endif #endif /* NEEDSOCKETS */ #ifdef notdef #include bogus definition of inet_makeaddr() in BSD 4.2 and Ultrix #else #if !defined(hpux) && !defined(NCR) extern unsigned long inet_makeaddr(); #endif #endif #ifdef DNETCONN #include #include #endif #ifdef SECURE_RPC #include #include #ifdef X_POSIX_C_SOURCE #define _POSIX_C_SOURCE X_POSIX_C_SOURCE #include #undef _POSIX_C_SOURCE #else #if defined(X_NOT_POSIX) || defined(_POSIX_SOURCE) #include #else #define _POSIX_SOURCE #include #undef _POSIX_SOURCE #endif #endif #ifndef NGROUPS_MAX #include #define NGROUPS_MAX NGROUPS #endif #endif static int local_xerror(); static char *get_hostname(); #ifdef SIGNALRETURNSINT #define signal_t int #else #define signal_t void #endif static signal_t nameserver_lost(); #define NAMESERVER_TIMEOUT 5 /* time to wait for nameserver */ int nameserver_timedout; char *ProgramName; #ifdef NEEDSOCKETS static int XFamily(af) int af; { int i; static struct _familyMap { int af, xf; } familyMap[] = { #ifdef AF_DECnet { AF_DECnet, FamilyDECnet }, #endif #ifdef AF_CHAOS { AF_CHAOS, FamilyChaos }, #endif #ifdef AF_INET { AF_INET, FamilyInternet }, #endif }; #define FAMILIES ((sizeof familyMap)/(sizeof familyMap[0])) for (i = 0; i < FAMILIES; i++) if (familyMap[i].af == af) return familyMap[i].xf; return -1; } #endif /* NEEDSOCKETS */ Display *dpy; main(argc, argv) int argc; char **argv; { register char *arg; int i, nhosts; char *hostname; int nfailed = 0; XHostAddress *list; Bool enabled = False; #ifdef DNETCONN char *dnet_htoa(); struct nodeent *np; struct dn_naddr *nlist, dnaddr, *dnaddrp, *dnet_addr(); char *cp; #endif ProgramName = argv[0]; if ((dpy = XOpenDisplay(NULL)) == NULL) { fprintf(stderr, "%s: unable to open display \"%s\"\n", ProgramName, XDisplayName (NULL)); exit(1); } XSetErrorHandler(local_xerror); if (argc == 1) { #ifdef DNETCONN setnodeent(1); /* keep the database accessed */ #endif sethostent(1); /* don't close the data base each time */ list = XListHosts(dpy, &nhosts, &enabled); if (enabled) printf ("access control enabled, only authorized clients can connect\n"); else printf ("access control disabled, clients can connect from any host\n"); if (nhosts != 0) { for (i = 0; i < nhosts; i++ ) { hostname = get_hostname(&list[i]); if (hostname) { switch (list[i].family) { case FamilyInternet: printf("INET:"); break; case FamilyDECnet: printf("DNET:"); break; case FamilyNetname: printf("NIS:"); break; case FamilyKrb5Principal: printf("KRB:"); break; case FamilyLocalHost: printf("LOCAL:"); break; } printf ("%s", hostname); } else { printf ("", list[i].family); } if (nameserver_timedout) { printf("\t(no nameserver response within %d seconds)\n", NAMESERVER_TIMEOUT); nameserver_timedout = 0; } else printf("\n"); } free(list); endhostent(); } exit(0); } if (argc == 2 && !strcmp(argv[1], "-help")) { fprintf(stderr, "usage: %s [[+-]hostname ...]\n", argv[0]); exit(1); } for (i = 1; i < argc; i++) { arg = argv[i]; if (*arg == '-') { if (!argv[i][1] && ((i+1) == argc)) { printf ("access control enabled, only authorized clients can connect\n"); XEnableAccessControl(dpy); } else { arg = argv[i][1]? &argv[i][1] : argv[++i]; if (!change_host (dpy, arg, False)) { fprintf (stderr, "%s: bad hostname \"%s\"\n", ProgramName, arg); nfailed++; } } } else { if (*arg == '+' && !argv[i][1] && ((i+1) == argc)) { printf ("access control disabled, clients can connect from any host\n"); XDisableAccessControl(dpy); } else { if (*arg == '+') { arg = argv[i][1]? &argv[i][1] : argv[++i]; } if (!change_host (dpy, arg, True)) { fprintf (stderr, "%s: bad hostname \"%s\"\n", ProgramName, arg); nfailed++; } } } } XCloseDisplay (dpy); /* does an XSync first */ exit(nfailed); } /* * change_host - edit the list of hosts that may connect to the server; * it parses DECnet names (expo::), Internet addresses (18.30.0.212), or * Internet names (expo.lcs.mit.edu); if 4.3bsd macro h_addr is defined * (from ), it will add or remove all addresses with the given * address. */ int change_host (dpy, name, add) Display *dpy; char *name; Bool add; { struct hostent *hp; XHostAddress ha; char *lname; int namelen, i, family = FamilyWild; #ifdef K5AUTH krb5_principal princ; krb5_data kbuf; #endif #ifdef NEEDSOCKETS #ifndef AMTCPCONN static struct in_addr addr; /* so we can point at it */ #else static ipaddr_t addr; #endif #endif char *cp; #ifdef DNETCONN struct dn_naddr *dnaddrp; struct nodeent *np; static struct dn_naddr dnaddr; #endif /* DNETCONN */ static char *add_msg = "being added to access control list"; static char *remove_msg = "being removed from access control list"; namelen = strlen(name); if ((lname = (char *)malloc(namelen)) == NULL) { fprintf (stderr, "%s: malloc bombed in change_host\n", ProgramName); exit (1); } for (i = 0; i < namelen; i++) { lname[i] = tolower(name[i]); } if (!strncmp("inet:", lname, 5)) { #if defined(TCPCONN) || defined(STREAMSCONN) || defined(AMTCPCONN) family = FamilyInternet; name += 5; #else fprintf (stderr, "%s: not compiled for TCP/IP\n", ProgramName); return 0; #endif } if (!strncmp("dnet:", lname, 5)) { #ifdef DNETCONN family = FamilyDECnet; name += 5; #else fprintf (stderr, "%s: not compiled for DECnet\n", ProgramName); return 0; #endif } if (!strncmp("nis:", lname, 4)) { #ifdef SECURE_RPC family = FamilyNetname; name += 4; #else fprintf (stderr, "%s: not compiled for Secure RPC\n", ProgramName); return 0; #endif } if (!strncmp("krb:", lname, 4)) { #ifdef K5AUTH family = FamilyKrb5Principal; name +=4; #else fprintf (stderr, "%s: not compiled for Kerberos 5\n", ProgramName); return 0; #endif } if (!strncmp("local:", lname, 6)) { family = FamilyLocalHost; } if (family == FamilyWild && (cp = strchr(lname, ':'))) { *cp = '\0'; fprintf (stderr, "%s: unknown address family \"%s\"\n", ProgramName, lname); return 0; } free(lname); #ifdef DNETCONN if (family == FamilyDECnet || (cp = strchr(name, ':')) && (*(cp + 1) == ':') && !(*cp = '\0')) { ha.family = FamilyDECnet; if (dnaddrp = dnet_addr(name)) { dnaddr = *dnaddrp; } else { if ((np = getnodebyname (name)) == NULL) { fprintf (stderr, "%s: unable to get node name for \"%s::\"\n", ProgramName, name); return 0; } dnaddr.a_len = np->n_length; memmove( dnaddr.a_addr, np->n_addr, np->n_length); } ha.length = sizeof(struct dn_naddr); ha.address = (char *)&dnaddr; if (add) { XAddHost (dpy, &ha); printf ("%s:: %s\n", name, add_msg); } else { XRemoveHost (dpy, &ha); printf ("%s:: %s\n", name, remove_msg); } return 1; } #endif /* DNETCONN */ #ifdef K5AUTH if (family == FamilyKrb5Principal) { krb5_error_code retval; retval = krb5_parse_name(name, &princ); if (retval) { krb5_init_ets(); /* init krb errs for error_message() */ fprintf(stderr, "%s: cannot parse Kerberos name: %s\n", ProgramName, error_message(retval)); return 0; } XauKrb5Encode(princ, &kbuf); ha.length = kbuf.length; ha.address = kbuf.data; ha.family = family; if (add) XAddHost(dpy, &ha); else XRemoveHost(dpy, &ha); krb5_free_principal(princ); free(kbuf.data); printf( "%s %s\n", name, add ? add_msg : remove_msg); return 1; } #endif if (family == FamilyLocalHost) { ha.length = 0; ha.address = ""; ha.family = family; if (add) XAddHost(dpy, &ha); else XRemoveHost(dpy, &ha); printf( "non-network local connections %s\n", add ? add_msg : remove_msg); return 1; } /* * If it has an '@', it's a netname */ if ((family == FamilyNetname && (cp = strchr(name, '@'))) || (cp = strchr(name, '@'))) { char *netname = name; #ifdef SECURE_RPC static char username[MAXNETNAMELEN]; if (!cp[1]) { struct passwd *pwd; static char domainname[128]; *cp = '\0'; pwd = getpwnam(name); if (!pwd) { fprintf(stderr, "no such user \"%s\"\n", name); return 0; } getdomainname(domainname, sizeof(domainname)); if (!user2netname(username, pwd->pw_uid, domainname)) { fprintf(stderr, "failed to get netname for \"%s\"\n", name); return 0; } netname = username; } #endif ha.family = FamilyNetname; ha.length = strlen(netname); ha.address = netname; if (add) XAddHost (dpy, &ha); else XRemoveHost (dpy, &ha); if (netname != name) printf ("%s@ (%s) %s\n", name, netname, add ? add_msg : remove_msg); else printf ("%s %s\n", netname, add ? add_msg : remove_msg); return 1; } #ifdef NEEDSOCKETS /* * First see if inet_addr() can grok the name; if so, then use it. */ #ifndef AMTCPCONN if ((addr.s_addr = inet_addr(name)) != -1) { #else if ((addr = inet_addr(name)) != -1) { #endif ha.family = FamilyInternet; ha.length = 4; /* but for Cray would be sizeof(addr.s_addr) */ ha.address = (char *)&addr; /* but for Cray would be &addr.s_addr */ if (add) { XAddHost (dpy, &ha); printf ("%s %s\n", name, add_msg); } else { XRemoveHost (dpy, &ha); printf ("%s %s\n", name, remove_msg); } return 1; } /* * Is it in the namespace? */ else if (((hp = gethostbyname(name)) == (struct hostent *)NULL) || hp->h_addrtype != AF_INET) { return 0; } else { ha.family = XFamily(hp->h_addrtype); ha.length = hp->h_length; #ifdef h_addr /* new 4.3bsd version of gethostent */ { char **list; /* iterate over the hosts */ for (list = hp->h_addr_list; *list; list++) { ha.address = *list; if (add) { XAddHost (dpy, &ha); } else { XRemoveHost (dpy, &ha); } } } #else ha.address = hp->h_addr; if (add) { XAddHost (dpy, &ha); } else { XRemoveHost (dpy, &ha); } #endif printf ("%s %s\n", name, add ? add_msg : remove_msg); return 1; } #else /* NEEDSOCKETS */ return 0; #endif /* NEEDSOCKETS */ } /* * get_hostname - Given an internet address, return a name (CHARON.MIT.EDU) * or a string representing the address (18.58.0.13) if the name cannot * be found. */ jmp_buf env; static char *get_hostname (ha) XHostAddress *ha; { #if defined(TCPCONN) || defined(STREAMSCONN) || defined(AMTCPCONN) struct hostent *hp = NULL; char *inet_ntoa(); #endif #ifdef DNETCONN struct nodeent *np; static char nodeaddr[5 + 2 * DN_MAXADDL]; #endif /* DNETCONN */ #ifdef K5AUTH krb5_principal princ; krb5_data kbuf; char *kname; static char kname_out[255]; #endif #if defined(TCPCONN) || defined(STREAMSCONN) || defined(AMTCPCONN) if (ha->family == FamilyInternet) { #ifdef CRAY struct in_addr t_addr; bzero((char *)&t_addr, sizeof(t_addr)); bcopy(ha->address, (char *)&t_addr, 4); ha->address = (char *)&t_addr; #endif /* gethostbyaddr can take a LONG time if the host does not exist. Assume that if it does not respond in NAMESERVER_TIMEOUT seconds that something is wrong and do not make the user wait. gethostbyaddr will continue after a signal, so we have to jump out of it. */ signal(SIGALRM, nameserver_lost); alarm(4); if (setjmp(env) == 0) { hp = gethostbyaddr (ha->address, ha->length, AF_INET); } alarm(0); if (hp) return (hp->h_name); #ifndef AMTCPCONN else return (inet_ntoa(*((struct in_addr *)(ha->address)))); #else else return (inet_ntoa(*((ipaddr_t *)(ha->address)))); #endif } #endif if (ha->family == FamilyNetname) { static char netname[512]; int len; #ifdef SECURE_RPC int uid, gid, gidlen, gidlist[NGROUPS_MAX]; #endif if (ha->length < sizeof(netname) - 1) len = ha->length; else len = sizeof(netname) - 1; memmove( netname, ha->address, len); netname[len] = '\0'; #ifdef SECURE_RPC if (netname2user(netname, &uid, &gid, &gidlen, gidlist)) { struct passwd *pwd; char *cp; pwd = getpwuid(uid); if (pwd) sprintf(netname, "%s@ (%*.*s)", pwd->pw_name, ha->length, ha->length, ha->address); } #endif return (netname); } #ifdef DNETCONN if (ha->family == FamilyDECnet) { struct dn_naddr *addr_ptr = (struct dn_naddr *) ha->address; if (np = getnodebyaddr(addr_ptr->a_addr, addr_ptr->a_len, AF_DECnet)) { sprintf(nodeaddr, "%s", np->n_name); } else { sprintf(nodeaddr, "%s", dnet_htoa(ha->address)); } return(nodeaddr); } #endif #ifdef K5AUTH if (ha->family == FamilyKrb5Principal) { kbuf.data = ha->address; kbuf.length = ha->length; XauKrb5Decode(kbuf, &princ); krb5_unparse_name(princ, &kname); krb5_free_principal(princ); strncpy(kname_out, kname, sizeof (kname_out)); free(kname); return kname_out; } #endif if (ha->family == FamilyLocalHost) { return ""; } return (NULL); } static signal_t nameserver_lost() { nameserver_timedout = 1; longjmp(env, -1); } /* * local_xerror - local non-fatal error handling routine. If the error was * that an X_GetHosts request for an unknown address format was received, just * return, otherwise print the normal error message and continue. */ static int local_xerror (dpy, rep) Display *dpy; XErrorEvent *rep; { if ((rep->error_code == BadAccess) && (rep->request_code == X_ChangeHosts)) { fprintf (stderr, "%s: must be on local machine to add or remove hosts.\n", ProgramName); return 1; } else if ((rep->error_code == BadAccess) && (rep->request_code == X_SetAccessControl)) { fprintf (stderr, "%s: must be on local machine to enable or disable access control.\n", ProgramName); return 1; } else if ((rep->error_code == BadValue) && (rep->request_code == X_ListHosts)) { return 1; } XmuPrintDefaultErrorMessage (dpy, rep, stderr); return 0; }