/* * $Xorg: gethost.c,v 1.4 2000/08/17 19:54:11 cpqbld Exp $ * * Copyright 1989, 1998 The Open Group All Rights Reserved. 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 OPEN GROUP 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 Open Group 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 Open Group. * * * Author: Jim Fulton, MIT X Consortium */ /* $XFree86: xc/programs/xauth/gethost.c,v 3.15 2001/07/25 15:05:16 dawes Exp $ */ /* sorry, streams support does not really work yet */ #if defined(STREAMSCONN) && defined(SVR4) #undef STREAMSCONN #define TCPCONN #endif #ifdef WIN32 #include #define EPROTOTYPE WSAEPROTOTYPE #endif #include #include #include #include #ifndef __TYPES__ #include #define __TYPES__ #endif #ifndef WIN32 #ifndef STREAMSCONN #ifndef Lynx #include #else #include #endif #include #include #include #ifdef SYSV #ifdef i386 #ifndef sco #include #endif /* !sco */ #endif /* i386 */ #endif /* SYSV */ #endif /* !STREAMSCONN */ #endif /* !WIN32 */ #include #include "xauth.h" #ifdef DNETCONN #include #include #endif #ifdef SIGALRM Bool nameserver_timedout = False; /* * 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. Stolen from xhost. */ static jmp_buf env; static #ifdef SIGNALRETURNSINT int #else void #endif nameserver_lost(int sig) { nameserver_timedout = True; longjmp (env, -1); /* NOTREACHED */ #ifdef SIGNALRETURNSINT return -1; /* for picky compilers */ #endif } #endif char * get_hostname (auth) Xauth *auth; { static struct hostent *hp = NULL; #ifdef DNETCONN struct nodeent *np; static char nodeaddr[4 + 2 * DN_MAXADDL]; #endif /* DNETCONN */ if (auth->address_length == 0) return "Illegal Address"; #ifdef TCPCONN if (auth->family == FamilyInternet) { #ifdef SIGALRM /* 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. */ nameserver_timedout = False; signal (SIGALRM, nameserver_lost); alarm (4); if (setjmp(env) == 0) { #endif hp = gethostbyaddr (auth->address, auth->address_length, AF_INET); #ifdef SIGALRM } alarm (0); #endif if (hp) return (hp->h_name); else return (inet_ntoa(*((struct in_addr *)(auth->address)))); } #endif #ifdef DNETCONN if (auth->family == FamilyDECnet) { struct dn_naddr *addr_ptr = (struct dn_naddr *) auth->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(auth->address)); } return(nodeaddr); } #endif return (NULL); } #ifdef TCPCONN /* * cribbed from lib/X/XConnDis.c */ static Bool get_inet_address(char *name, unsigned int *resultp) { unsigned int hostinetaddr = inet_addr (name); struct hostent *host_ptr; struct sockaddr_in inaddr; /* dummy variable for size calcs */ #ifndef INADDR_NONE #define INADDR_NONE -1 #endif if (hostinetaddr == INADDR_NONE) { if ((host_ptr = gethostbyname (name)) == NULL) { /* No such host! */ errno = EINVAL; return False; } /* Check the address type for an internet host. */ if (host_ptr->h_addrtype != AF_INET) { /* Not an Internet host! */ errno = EPROTOTYPE; return False; } memmove( (char *)&hostinetaddr, (char *)host_ptr->h_addr, sizeof(inaddr.sin_addr)); } *resultp = hostinetaddr; return True; } #endif #ifdef DNETCONN static Bool get_dnet_address (name, resultp) char *name; struct dn_naddr *resultp; { struct dn_naddr *dnaddrp, dnaddr; struct nodeent *np; if (dnaddrp = dnet_addr (name)) { /* stolen from xhost */ dnaddr = *dnaddrp; } else { if ((np = getnodebyname (name)) == NULL) return False; dnaddr.a_len = np->n_length; memmove( dnaddr.a_addr, np->n_addr, np->n_length); } *resultp = dnaddr; return True; } #endif char *get_address_info (family, fulldpyname, prefix, host, lenp) int family; char *fulldpyname; int prefix; char *host; int *lenp; { char *retval = NULL; int len = 0; char *src = NULL; #ifdef TCPCONN unsigned int hostinetaddr; #endif #ifdef DNETCONN struct dn_naddr dnaddr; #endif char buf[255]; /* * based on the family, set the pointer src to the start of the address * information to be copied and set len to the number of bytes. */ switch (family) { case FamilyLocal: /* hostname/unix:0 */ /* handle unix:0 and :0 specially */ if (prefix == 0 && (strncmp (fulldpyname, "unix:", 5) == 0 || fulldpyname[0] == ':')) { if (!get_local_hostname (buf, sizeof buf)) { len = 0; } else { src = buf; len = strlen (buf); } } else { src = fulldpyname; len = prefix; } break; case FamilyInternet: /* host:0 */ #ifdef TCPCONN if (!get_inet_address (host, &hostinetaddr)) return NULL; src = (char *) &hostinetaddr; len = 4; /* sizeof inaddr.sin_addr, would fail on Cray */ break; #else return NULL; #endif case FamilyDECnet: /* host::0 */ #ifdef DNETCONN if (!get_dnet_address (host, &dnaddr)) return NULL; src = (char *) &dnaddr; len = (sizeof dnaddr); break; #else /* fall through since we don't have code for it */ #endif default: src = NULL; len = 0; } /* * if source was provided, allocate space and copy it */ if (len == 0 || !src) return NULL; retval = malloc (len); if (retval) { memmove( retval, src, len); *lenp = len; } return retval; }