Edit
IABSD.fr/xenocara/lib/libICE/src/authutil.c
matthieu
- lib/libICE/src/authutil.c
-
/****************************************************************************** Copyright 1993, 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: Ralph Mor, X Consortium ******************************************************************************/ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <X11/ICE/ICElib.h> #include "ICElibint.h" #include <X11/ICE/ICEutil.h> #include <X11/Xos.h> #include <sys/stat.h> #include <errno.h> #include <limits.h> #include <time.h> #ifndef X_NOT_POSIX #include <unistd.h> #else #ifndef WIN32 extern unsigned sleep (); #else #define link rename #endif #endif static Status read_short (FILE *file, unsigned short *shortp); static Status read_string (FILE *file, char **stringp); static Status read_counted_string (FILE *file, unsigned short *countp, char **stringp); static Status write_short (FILE *file, unsigned short s); static Status write_string (FILE *file, const char *string); static Status write_counted_string (FILE *file, unsigned short count, const char *string); /* * The following routines are for manipulating the .ICEauthority file * These are utility functions - they are not part of the standard * ICE library specification. */ char * IceAuthFileName (void) { const char *ICEauthority_name = ".ICEauthority"; char *name; static char *buf; static size_t bsize; size_t size; #ifdef WIN32 #ifndef PATH_MAX #define PATH_MAX 512 #endif char dir[PATH_MAX]; #endif if ((name = getenv ("ICEAUTHORITY"))) return (name); /* If it's in the XDG_RUNTIME_DIR, don't use a dotfile */ if ((name = getenv ("XDG_RUNTIME_DIR"))) ICEauthority_name++; if (!name || !name[0]) name = getenv ("HOME"); if (!name || !name[0]) { #ifdef WIN32 register char *ptr1; register char *ptr2; int len1 = 0, len2 = 0; if ((ptr1 = getenv("HOMEDRIVE")) && (ptr2 = getenv("HOMEDIR"))) { len1 = strlen (ptr1); len2 = strlen (ptr2); } else if ((ptr2 = getenv("USERNAME"))) { len1 = strlen (ptr1 = "/users/"); len2 = strlen (ptr2); } if ((len1 + len2 + 1) < PATH_MAX) { snprintf (dir, sizeof(dir), "%s%s", ptr1, (ptr2) ? ptr2 : ""); name = dir; } if (!name || !name[0]) #endif return (NULL); } /* Special case for "/". We will add our own '/' later. */ if (name[1] == '\0') name++; size = strlen (name) + 1 + strlen (ICEauthority_name) + 1; if (size > bsize) { free (buf); buf = malloc (size); if (!buf) { bsize = 0; return (NULL); } bsize = size; } snprintf (buf, bsize, "%s/%s", name, ICEauthority_name); return (buf); } int IceLockAuthFile ( const char *file_name, int retries, int timeout, long dead ) { char creat_name[1025], link_name[1025]; struct stat statb; time_t now; int creat_fd = -1; if ((int) strlen (file_name) > 1022) return (IceAuthLockError); snprintf (creat_name, sizeof(creat_name), "%s-c", file_name); snprintf (link_name, sizeof(link_name), "%s-l", file_name); if (stat (creat_name, &statb) != -1) { now = time ((time_t *) 0); /* * NFS may cause ctime to be before now, special * case a 0 deadtime to force lock removal */ if (dead == 0 || now - statb.st_ctime > dead) { unlink (creat_name); unlink (link_name); } } while (retries > 0) { if (creat_fd == -1) { creat_fd = open (creat_name, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0666); if (creat_fd == -1) { if (errno != EACCES) return (IceAuthLockError); } else close (creat_fd); } if (creat_fd != -1) { if (link (creat_name, link_name) != -1) return (IceAuthLockSuccess); if (errno == ENOENT) { creat_fd = -1; /* force re-creat next time around */ continue; } if (errno != EEXIST) return (IceAuthLockError); } sleep ((unsigned) timeout); --retries; } return (IceAuthLockTimeout); } void IceUnlockAuthFile ( const char *file_name ) { #ifndef WIN32 char creat_name[1025]; #endif char link_name[1025]; if ((int) strlen (file_name) > 1022) return; #ifndef WIN32 snprintf (creat_name, sizeof(creat_name), "%s-c", file_name); unlink (creat_name); #endif snprintf (link_name, sizeof(link_name), "%s-l", file_name); unlink (link_name); } IceAuthFileEntry * IceReadAuthFileEntry ( FILE *auth_file ) { IceAuthFileEntry local; IceAuthFileEntry *ret; local.protocol_name = NULL; local.protocol_data = NULL; local.network_id = NULL; local.auth_name = NULL; local.auth_data = NULL; if (!read_string (auth_file, &local.protocol_name)) return (NULL); if (!read_counted_string (auth_file, &local.protocol_data_length, &local.protocol_data)) goto bad; if (!read_string (auth_file, &local.network_id)) goto bad; if (!read_string (auth_file, &local.auth_name)) goto bad; if (!read_counted_string (auth_file, &local.auth_data_length, &local.auth_data)) goto bad; if (!(ret = malloc (sizeof (IceAuthFileEntry)))) goto bad; *ret = local; return (ret); bad: free (local.protocol_name); free (local.protocol_data); free (local.network_id); free (local.auth_name); free (local.auth_data); return (NULL); } void IceFreeAuthFileEntry ( IceAuthFileEntry *auth ) { if (auth) { free (auth->protocol_name); free (auth->protocol_data); free (auth->network_id); free (auth->auth_name); free (auth->auth_data); free (auth); } } Status IceWriteAuthFileEntry ( FILE *auth_file, IceAuthFileEntry *auth ) { if (!write_string (auth_file, auth->protocol_name)) return (0); if (!write_counted_string (auth_file, auth->protocol_data_length, auth->protocol_data)) return (0); if (!write_string (auth_file, auth->network_id)) return (0); if (!write_string (auth_file, auth->auth_name)) return (0); if (!write_counted_string (auth_file, auth->auth_data_length, auth->auth_data)) return (0); return (1); } IceAuthFileEntry * IceGetAuthFileEntry ( const char *protocol_name, const char *network_id, const char *auth_name ) { FILE *auth_file; char *filename; IceAuthFileEntry *entry; if (!(filename = IceAuthFileName ())) return (NULL); if (access (filename, R_OK) != 0) /* checks REAL id */ return (NULL); if (!(auth_file = fopen (filename, "rb" FOPEN_CLOEXEC))) return (NULL); for (;;) { if (!(entry = IceReadAuthFileEntry (auth_file))) break; if (strcmp (protocol_name, entry->protocol_name) == 0 && strcmp (network_id, entry->network_id) == 0 && strcmp (auth_name, entry->auth_name) == 0) { break; } IceFreeAuthFileEntry (entry); } fclose (auth_file); return (entry); } /* * local routines */ static Status read_short (FILE *file, unsigned short *shortp) { unsigned char file_short[2]; if (fread (file_short, sizeof (file_short), 1, file) != 1) return (0); *shortp = file_short[0] * 256 + file_short[1]; return (1); } static Status read_string (FILE *file, char **stringp) { unsigned short len; char *data; if (!read_short (file, &len)) return (0); data = malloc ((unsigned) len + 1); if (!data) return (0); if (len != 0) { if (fread (data, sizeof (char), len, file) != len) { free (data); return (0); } } data[len] = '\0'; *stringp = data; return (1); } static Status read_counted_string (FILE *file, unsigned short *countp, char **stringp) { unsigned short len; char *data; if (!read_short (file, &len)) return (0); if (len == 0) { data = NULL; } else { data = malloc ((unsigned) len); if (!data) return (0); if (fread (data, sizeof (char), len, file) != len) { free (data); return (0); } } *stringp = data; *countp = len; return (1); } static Status write_short (FILE *file, unsigned short s) { unsigned char file_short[2]; file_short[0] = (s & (unsigned) 0xff00) >> 8; file_short[1] = s & 0xff; if (fwrite (file_short, sizeof (file_short), 1, file) != 1) return (0); return (1); } static Status write_string (FILE *file, const char *string) { size_t count = strlen (string); if (count > USHRT_MAX) return (0); return write_counted_string (file, (unsigned short) count, string); } static Status write_counted_string (FILE *file, unsigned short count, const char *string) { if (!write_short (file, count)) return (0); if ((count > 0) && (fwrite (string, sizeof (char), count, file) != count)) return (0); return (1); }