Edit
IABSD.fr/xenocara/app/xauth/gethost.c
matthieu
- app/xauth/gethost.c
-
/* * Copyright 1989, 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. * * * Author: Jim Fulton, MIT X Consortium */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef WIN32 #include <X11/Xwinsock.h> #define EPROTOTYPE WSAEPROTOTYPE #endif #include <X11/X.h> #include <signal.h> #include <setjmp.h> #include <ctype.h> #ifndef __TYPES__ #include <sys/types.h> #define __TYPES__ #endif #ifndef WIN32 #ifndef Lynx #include <sys/socket.h> #else #include <socket.h> #endif #include <netdb.h> #include <netinet/in.h> #include <arpa/inet.h> #ifdef HAVE_NET_ERRNO_H #include <net/errno.h> #endif /* HAVE_NET_ERRNO_H */ #endif /* !WIN32 */ #include <errno.h> #include "xauth.h" #include <sys/stat.h> #include <limits.h> #ifndef WIN32 #include <arpa/inet.h> #endif const char * get_hostname (Xauth *auth) { #ifdef TCPCONN static struct hostent *hp; int af; hp = NULL; #endif if (auth->address_length == 0) return "Illegal Address"; #ifdef TCPCONN if (auth->family == FamilyInternet #if defined(IPv6) && defined(AF_INET6) || auth->family == FamilyInternet6 #endif ) { #if defined(IPv6) && defined(AF_INET6) if (auth->family == FamilyInternet6) af = AF_INET6; else #endif af = AF_INET; if (no_name_lookups == False) { hp = gethostbyaddr (auth->address, auth->address_length, af); } if (hp) return (hp->h_name); #if defined(IPv6) && defined(AF_INET6) else if (af == AF_INET6) { static char addr[INET6_ADDRSTRLEN+2]; /* Add [] for clarity to distinguish between address & display, like RFC 2732 for URL's. Not required, since X display syntax always ends in :<display>, but makes it easier for people to read and less confusing to those who expect the RFC 2732 style. */ addr[0] = '['; if (inet_ntop(af, auth->address, addr + 1, INET6_ADDRSTRLEN) == NULL) return NULL; strcat(addr, "]"); return addr; } #endif else { return (inet_ntoa(*((struct in_addr *)(auth->address)))); } } #endif return (NULL); } #if defined(TCPCONN) && (!defined(IPv6) || !defined(AF_INET6)) /* * 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 struct addrlist *get_address_info ( int family, const char *fulldpyname, int prefix, char *host) { struct addrlist *retval = NULL; int len = 0; const void *src = NULL; #ifdef TCPCONN #if defined(IPv6) && defined(AF_INET6) struct addrlist *lastrv = NULL; struct addrinfo *firstai = NULL; struct addrinfo *ai = NULL; struct addrinfo hints; #else unsigned int hostinetaddr; #endif #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 { char path[PATH_MAX]; struct stat sbuf; int is_path_to_socket = 0; #ifdef HAVE_STRLCPY strlcpy(path, fulldpyname, sizeof(path)); #else strncpy(path, fulldpyname, sizeof(path) - 1); path[sizeof(path) - 1] = '\0'; #endif if (0 == stat(path, &sbuf) && S_ISSOCK(sbuf.st_mode) ) { is_path_to_socket = 1; } else { char *dot = strrchr(path, '.'); if (dot) { *dot = '\0'; /* screen = atoi(dot + 1); */ if (0 == stat(path, &sbuf) && S_ISSOCK(sbuf.st_mode)) { is_path_to_socket = 1; } } } if (is_path_to_socket) { /* Use the bundle id (part preceding : in the basename) as our src id */ char *c; c = strrchr(fulldpyname, '/'); #ifdef HAVE_STRLCPY strlcpy(buf, (NULL != c) ? c + 1 : fulldpyname, sizeof(buf)); #else strncpy(buf, (NULL != c) ? c + 1 : fulldpyname, sizeof(buf) - 1); buf[sizeof(buf) - 1] = '\0'; #endif c = strchr(buf, ':'); /* In the legacy case with no bundle id, use the full path */ if(c == buf) { src = fulldpyname; } else { *c = '\0'; src = buf; } len = strlen(src); } else { src = fulldpyname; len = prefix; } } break; case FamilyInternet: /* host:0 */ #ifdef TCPCONN #if defined(IPv6) && defined(AF_INET6) case FamilyInternet6: memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; /* IPv4 or IPv6 */ hints.ai_socktype = SOCK_STREAM; /* only interested in TCP */ hints.ai_protocol = 0; if (getaddrinfo(host,NULL,&hints,&firstai) !=0) return NULL; for (ai = firstai; ai != NULL; ai = ai->ai_next) { struct addrlist *duplicate; len = 0; if (ai->ai_family == AF_INET) { struct sockaddr_in *sin = (struct sockaddr_in *)ai->ai_addr; src = &(sin->sin_addr); if (*(const in_addr_t *) src == htonl(INADDR_LOOPBACK)) { family = FamilyLocal; if (get_local_hostname (buf, sizeof buf)) { src = buf; len = strlen (buf); } else src = NULL; } else { len = sizeof(sin->sin_addr); family = FamilyInternet; } } else if (ai->ai_family == AF_INET6) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai->ai_addr; src = &(sin6->sin6_addr); if (!IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)src)) { if (IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)src)) { family = FamilyLocal; if (get_local_hostname (buf, sizeof buf)) { src = buf; len = strlen (buf); } else src = NULL; } else { len = sizeof(sin6->sin6_addr); family = FamilyInternet6; } } else { src = &(sin6->sin6_addr.s6_addr[12]); len = sizeof(((struct sockaddr_in *) ai->ai_addr)->sin_addr); family = FamilyInternet; } } for(duplicate = retval; duplicate != NULL; duplicate = duplicate->next) { if(duplicate->family == family && duplicate->len == len && memcmp(duplicate->address, src, len) == 0) { break; } } if (len > 0 && src != NULL && duplicate == NULL) { struct addrlist *newrv = malloc (sizeof(struct addrlist)); if (newrv) { newrv->address = malloc (len); if (newrv->address) { memcpy(newrv->address, src, len); newrv->next = NULL; newrv->family = family; newrv->len = len; if (retval == NULL) { lastrv = retval = newrv; } else { lastrv->next = newrv; lastrv = newrv; } } else { free(newrv); } } } /* reset to avoid copying into list twice */ len = 0; src = NULL; } freeaddrinfo(firstai); break; #else if (!get_inet_address (host, &hostinetaddr)) return NULL; src = (char *) &hostinetaddr; if (*(const in_addr_t *) src == htonl(INADDR_LOOPBACK)) { family = FamilyLocal; if (get_local_hostname (buf, sizeof buf)) { src = buf; len = strlen (buf); } else { len = 0; src = NULL; } } else len = 4; /* sizeof inaddr.sin_addr, would fail on Cray */ break; #endif /* IPv6 */ #else return NULL; #endif case FamilyDECnet: /* host::0 */ /* fall through since we don't have code for it */ default: src = NULL; len = 0; } /* * if source was provided, allocate space and copy it */ if (len > 0 && src != NULL) { retval = malloc (sizeof(struct addrlist)); if (retval) { retval->address = malloc (len); if (retval->address) { memcpy(retval->address, src, len); retval->next = NULL; retval->family = family; retval->len = len; } else { free(retval); retval = NULL; } } } return retval; }