/* $Xorg: Xtransutil.c,v 1.4 2001/02/09 02:04:07 xorgcvs Exp $ */ /* Copyright 1993, 1994, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. 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. */ /* $XFree86: xc/lib/xtrans/Xtransutil.c,v 3.26 2003/07/09 15:27:30 tsi Exp $ */ /* Copyright 1993, 1994 NCR Corporation - Dayton, Ohio, USA * * All Rights Reserved * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose and without fee is hereby granted, provided * that the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the name NCR not be used in advertising * or publicity pertaining to distribution of the software without specific, * written prior permission. NCR makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. * * NCRS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN * NO EVENT SHALL NCR BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * These are some utility functions created for convenience or to provide * an interface that is similar to an existing interface. These are built * only using the Transport Independant API, and have no knowledge of * the internal implementation. */ #ifdef XTHREADS #include <X11/Xthreads.h> #endif #ifdef X11_t /* * These values come from X.h and Xauth.h, and MUST match them. Some * of these values are also defined by the ChangeHost protocol message. */ #define FamilyInternet 0 /* IPv4 */ #define FamilyDECnet 1 #define FamilyChaos 2 #define FamilyInternet6 6 #define FamilyAmoeba 33 #define FamilyLocalHost 252 #define FamilyKrb5Principal 253 #define FamilyNetname 254 #define FamilyLocal 256 #define FamilyWild 65535 /* * TRANS(ConvertAddress) converts a sockaddr based address to an * X authorization based address. Some of this is defined as part of * the ChangeHost protocol. The rest is just done in a consistent manner. */ int TRANS(ConvertAddress)(int *familyp, int *addrlenp, Xtransaddr **addrp) { PRMSG(2,"ConvertAddress(%d,%d,%x)\n",*familyp,*addrlenp,*addrp); switch( *familyp ) { #if defined(TCPCONN) || defined(STREAMSCONN) case AF_INET: { /* * Check for the BSD hack localhost address 127.0.0.1. * In this case, we are really FamilyLocal. */ struct sockaddr_in saddr; int len = sizeof(saddr.sin_addr.s_addr); char *cp = (char *) &saddr.sin_addr.s_addr; memcpy (&saddr, *addrp, sizeof (struct sockaddr_in)); if ((len == 4) && (cp[0] == 127) && (cp[1] == 0) && (cp[2] == 0) && (cp[3] == 1)) { *familyp=FamilyLocal; } else { *familyp=FamilyInternet; *addrlenp=len; memcpy(*addrp,&saddr.sin_addr,len); } break; } #if defined(IPv6) && defined(AF_INET6) case AF_INET6: { struct sockaddr_in6 saddr6; memcpy (&saddr6, *addrp, sizeof (struct sockaddr_in6)); if (IN6_IS_ADDR_LOOPBACK(&saddr6.sin6_addr)) { *familyp=FamilyLocal; } else if (IN6_IS_ADDR_V4MAPPED(&(saddr6.sin6_addr))) { char *cp = (char *) &saddr6.sin6_addr.s6_addr[12]; if ((cp[0] == 127) && (cp[1] == 0) && (cp[2] == 0) && (cp[3] == 1)) { *familyp=FamilyLocal; } else { *familyp=FamilyInternet; *addrlenp = sizeof (struct in_addr); memcpy(*addrp,cp,*addrlenp); } } else { *familyp=FamilyInternet6; *addrlenp=sizeof(saddr6.sin6_addr); memcpy(*addrp,&saddr6.sin6_addr,sizeof(saddr6.sin6_addr)); } break; } #endif /* IPv6 */ #endif /* defined(TCPCONN) || defined(STREAMSCONN) */ #if defined(DNETCONN) case AF_DECnet: { struct sockaddr_dn saddr; memcpy (&saddr, *addrp, sizeof (struct sockaddr_dn)); *familyp=FamilyDECnet; *addrlenp=sizeof(struct dn_naddr); memcpy(*addrp,&saddr.sdn_add,*addrlenp); break; } #endif /* defined(DNETCONN) */ #if defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) case AF_UNIX: { *familyp=FamilyLocal; break; } #endif /* defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN)*/ #if (defined(__SCO__) || defined(__UNIXWARE__)) && defined(LOCALCONN) case 0: { *familyp=FamilyLocal; break; } #endif default: PRMSG(1,"ConvertAddress: Unknown family type %d\n", *familyp, 0,0 ); return -1; } if (*familyp == FamilyLocal) { /* * In the case of a local connection, we need to get the * host name for authentication. */ char hostnamebuf[256]; int len = TRANS(GetHostname) (hostnamebuf, sizeof hostnamebuf); if (len > 0) { if (*addrp && *addrlenp < (len + 1)) { xfree ((char *) *addrp); *addrp = NULL; } if (!*addrp) *addrp = (Xtransaddr *) xalloc (len + 1); if (*addrp) { strcpy ((char *) *addrp, hostnamebuf); *addrlenp = len; } else { *addrlenp = 0; } } else { if (*addrp) xfree ((char *) *addrp); *addrp = NULL; *addrlenp = 0; } } return 0; } #endif /* X11_t */ #ifdef ICE_t #include <signal.h> char * TRANS(GetMyNetworkId) (XtransConnInfo ciptr) { int family = ciptr->family; char *addr = ciptr->addr; char hostnamebuf[256]; char *networkId = NULL; char *transName = ciptr->transptr->TransName; if (gethostname (hostnamebuf, sizeof (hostnamebuf)) < 0) { return (NULL); } switch (family) { #if defined(UNIXCONN) || defined(STREAMSCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) case AF_UNIX: { struct sockaddr_un *saddr = (struct sockaddr_un *) addr; networkId = (char *) xalloc (3 + strlen (transName) + strlen (hostnamebuf) + strlen (saddr->sun_path)); sprintf (networkId, "%s/%s:%s", transName, hostnamebuf, saddr->sun_path); break; } #endif /* defined(UNIXCONN) || defined(STREAMSCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) */ #if defined(TCPCONN) || defined(STREAMSCONN) case AF_INET: #if defined(IPv6) && defined(AF_INET6) case AF_INET6: #endif { struct sockaddr_in *saddr = (struct sockaddr_in *) addr; #if defined(IPv6) && defined(AF_INET6) struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) addr; #endif int portnum; char portnumbuf[10]; #if defined(IPv6) && defined(AF_INET6) if (family == AF_INET6) portnum = ntohs (saddr6->sin6_port); else #endif portnum = ntohs (saddr->sin_port); sprintf (portnumbuf, "%d", portnum); networkId = (char *) xalloc (3 + strlen (transName) + strlen (hostnamebuf) + strlen (portnumbuf)); sprintf (networkId, "%s/%s:%s", transName, hostnamebuf, portnumbuf); break; } #endif /* defined(TCPCONN) || defined(STREAMSCONN) */ #if defined(DNETCONN) case AF_DECnet: { struct sockaddr_dn *saddr = (struct sockaddr_dn *) addr; networkId = (char *) xalloc ( 13 + strlen (hostnamebuf) + saddr->sdn_objnamel); sprintf (networkId, "dnet/%s::%s", hostnamebuf, saddr->sdn_objname); break; } #endif /* defined(DNETCONN) */ default: break; } return (networkId); } #include <setjmp.h> static jmp_buf env; #ifdef SIGALRM static volatile int nameserver_timedout = 0; static #ifdef RETSIGTYPE /* set by autoconf AC_TYPE_SIGNAL */ RETSIGTYPE #else /* Imake */ #ifdef SIGNALRETURNSINT int #else void #endif #endif nameserver_lost(int sig) { nameserver_timedout = 1; longjmp (env, -1); /* NOTREACHED */ #ifdef SIGNALRETURNSINT return -1; /* for picky compilers */ #endif } #endif /* SIGALARM */ char * TRANS(GetPeerNetworkId) (XtransConnInfo ciptr) { int family = ciptr->family; char *peer_addr = ciptr->peeraddr; char *hostname; char addrbuf[256]; const char *addr = NULL; switch (family) { case AF_UNSPEC: #if defined(UNIXCONN) || defined(STREAMSCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) case AF_UNIX: { if (gethostname (addrbuf, sizeof (addrbuf)) == 0) addr = addrbuf; break; } #endif /* defined(UNIXCONN) || defined(STREAMSCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) */ #if defined(TCPCONN) || defined(STREAMSCONN) case AF_INET: #if defined(IPv6) && defined(AF_INET6) case AF_INET6: #endif { struct sockaddr_in *saddr = (struct sockaddr_in *) peer_addr; #if defined(IPv6) && defined(AF_INET6) struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) peer_addr; #endif char *address; int addresslen; #ifdef XTHREADS_NEEDS_BYNAMEPARAMS _Xgethostbynameparams hparams; #endif struct hostent * volatile hostp = NULL; #if defined(IPv6) && defined(AF_INET6) if (family == AF_INET6) { address = (char *) &saddr6->sin6_addr; addresslen = sizeof (saddr6->sin6_addr); } else #endif { address = (char *) &saddr->sin_addr; addresslen = sizeof (saddr->sin_addr); } #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 = 0; signal (SIGALRM, nameserver_lost); alarm (4); if (setjmp(env) == 0) { #endif hostp = _XGethostbyaddr (address, addresslen, family, hparams); #ifdef SIGALRM } alarm (0); #endif if (hostp != NULL) addr = hostp->h_name; else #if defined(IPv6) && defined(AF_INET6) addr = inet_ntop (family, address, addrbuf, sizeof (addrbuf)); #else addr = inet_ntoa (saddr->sin_addr); #endif break; } #endif /* defined(TCPCONN) || defined(STREAMSCONN) */ #if defined(DNETCONN) case AF_DECnet: { struct sockaddr_dn *saddr = (struct sockaddr_dn *) peer_addr; struct nodeent *np; if (np = getnodebyaddr(saddr->sdn_add.a_addr, saddr->sdn_add.a_len, AF_DECnet)) { sprintf(addrbuf, "%s:", np->n_name); } else { sprintf(addrbuf, "%s:", dnet_htoa(&saddr->sdn_add)); } addr = addrbuf; break; } #endif /* defined(DNETCONN) */ default: return (NULL); } hostname = (char *) xalloc ( strlen (ciptr->transptr->TransName) + strlen (addr) + 2); strcpy (hostname, ciptr->transptr->TransName); strcat (hostname, "/"); if (addr) strcat (hostname, addr); return (hostname); } #endif /* ICE_t */ #if defined(WIN32) && (defined(TCPCONN) || defined(DNETCONN)) int TRANS(WSAStartup) (void) { static WSADATA wsadata; PRMSG (2,"WSAStartup()\n", 0, 0, 0); if (!wsadata.wVersion && WSAStartup(0x0101, &wsadata)) return 1; return 0; } #endif static int is_numeric (char *str) { int i; for (i = 0; i < (int) strlen (str); i++) if (!isdigit (str[i])) return (0); return (1); } #ifdef TRANS_SERVER #include <sys/types.h> #include <sys/stat.h> #include <errno.h> #if !defined(S_IFLNK) && !defined(S_ISLNK) #undef lstat #define lstat(a,b) stat(a,b) #endif #define FAIL_IF_NOMODE 1 #define FAIL_IF_NOT_ROOT 2 #define WARN_NO_ACCESS 4 /* * We make the assumption that when the 'sticky' (t) bit is requested * it's not save if the directory has non-root ownership or the sticky * bit cannot be set and fail. */ static int trans_mkdir(char *path, int mode) { struct stat buf; if (lstat(path, &buf) != 0) { if (errno != ENOENT) { PRMSG(1, "mkdir: ERROR: (l)stat failed for %s (%d)\n", path, errno, 0); return -1; } /* Dir doesn't exist. Try to create it */ #ifndef WIN32 /* * 'sticky' bit requested: assume application makes * certain security implications. If effective user ID * is != 0: fail as we may not be able to meet them. */ if (geteuid() != 0) { if (mode & 01000) { PRMSG(1, "mkdir: ERROR: euid != 0," "directory %s will not be created.\n", path, 0, 0); #ifdef FAIL_HARD return -1; #endif } else { PRMSG(1, "mkdir: Cannot create %s with root ownership\n", path, 0, 0); } } #endif #ifndef WIN32 if (mkdir(path, mode) == 0) { if (chmod(path, mode)) { PRMSG(1, "mkdir: ERROR: Mode of %s should be set to %04o\n", path, mode, 0); #ifdef FAIL_HARD return -1; #endif } #else if (mkdir(path) == 0) { #endif } else { PRMSG(1, "mkdir: ERROR: Cannot create %s\n", path, 0, 0); return -1; } return 0; } else { if (S_ISDIR(buf.st_mode)) { int updateOwner = 0; int updateMode = 0; int updatedOwner = 0; int updatedMode = 0; int status = 0; /* Check if the directory's ownership is OK. */ if (buf.st_uid != 0) updateOwner = 1; /* * Check if the directory's mode is OK. An exact match isn't * required, just a mode that isn't more permissive than the * one requested. */ if ((~mode) & 0077 & buf.st_mode) updateMode = 1; /* * If the directory is not writeable not everybody may * be able to create sockets. Therefore warn if mode * cannot be fixed. */ if ((~buf.st_mode) & 0022 & mode) { updateMode = 1; status |= WARN_NO_ACCESS; } /* * If 'sticky' bit is requested fail if owner isn't root * as we assume the caller makes certain security implications */ if (mode & 01000) { status |= FAIL_IF_NOT_ROOT; if (!(buf.st_mode & 01000)) { status |= FAIL_IF_NOMODE; updateMode = 1; } } #ifdef HAS_FCHOWN /* * If fchown(2) and fchmod(2) are available, try to correct the * directory's owner and mode. Otherwise it isn't safe to attempt * to do this. */ if (updateMode || updateOwner) { int fd = -1; struct stat fbuf; if ((fd = open(path, O_RDONLY)) != -1) { if (fstat(fd, &fbuf) == -1) { PRMSG(1, "mkdir: ERROR: fstat failed for %s (%d)\n", path, errno, 0); return -1; } /* * Verify that we've opened the same directory as was * checked above. */ if (!S_ISDIR(fbuf.st_mode) || buf.st_dev != fbuf.st_dev || buf.st_ino != fbuf.st_ino) { PRMSG(1, "mkdir: ERROR: inode for %s changed\n", path, 0, 0); return -1; } if (updateOwner && fchown(fd, 0, 0) == 0) updatedOwner = 1; if (updateMode && fchmod(fd, mode) == 0) updatedMode = 1; close(fd); } } #endif if (updateOwner && !updatedOwner) { #ifdef FAIL_HARD if (status & FAIL_IF_NOT_ROOT) { PRMSG(1, "mkdir: ERROR: Owner of %s must be set to root\n", path, 0, 0); return -1; } #endif PRMSG(1, "mkdir: Owner of %s should be set to root\n", path, 0, 0); } if (updateMode && !updatedMode) { #ifdef FAIL_HARD if (status & FAIL_IF_NOMODE) { PRMSG(1, "mkdir: ERROR: Mode of %s must be set to %04o\n", path, mode, 0); return -1; } #endif PRMSG(1, "mkdir: Mode of %s should be set to %04o\n", path, mode, 0); if (status & WARN_NO_ACCESS) { PRMSG(1, "mkdir: this may cause subsequent errors\n", 0, 0, 0); } } return 0; } return -1; } /* In all other cases, fail */ return -1; } #endif /* TRANS_SERVER */