/* devfsd implementation for busybox Copyright (C) 2003 by Tito Ragusa Busybox version is based on some previous work and ideas Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it> devfsd.c Main file for devfsd (devfs daemon for Linux). Copyright (C) 1998-2002 Richard Gooch devfsd.h Header file for devfsd (devfs daemon for Linux). Copyright (C) 1998-2000 Richard Gooch compat_name.c Compatibility name file for devfsd (build compatibility names). Copyright (C) 1998-2002 Richard Gooch expression.c This code provides Borne Shell-like expression expansion. Copyright (C) 1997-1999 Richard Gooch This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Richard Gooch may be reached by email at rgooch@atnf.csiro.au The postal address is: Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia. */ #include "libbb.h" #include "busybox.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef IDE6_MAJOR /* In case we're building with an ancient kernel */ # define IDE6_MAJOR 88 # define IDE7_MAJOR 89 # define IDE8_MAJOR 90 # define IDE9_MAJOR 91 #endif /* These are now in Config.in */ /* define this if you want to have more output on stderr and syslog at the same time */ /*#define CONFIG_DEVFSD_VERBOSE*/ /* define this if you want to have the function names in output */ /*#define CONFIG_DEVFSD_DEBUG*/ #define BUFFER_SIZE 16384 #define DEVFSD_VERSION "1.3.25" #define CONFIG_FILE "/etc/devfsd.conf" #define MAX_ARGS (6 + 1) #define MAX_SUBEXPR 10 #define STRING_LENGTH 255 /* for get_uid_gid() */ #define UID 0 #define GID 1 /* for msg_logger(), do_ioctl(), fork_and_execute() and xopendir(). */ # define DIE 1 # define NO_DIE 0 /* Update only after changing code to reflect new protocol */ #define DEVFSD_PROTOCOL_REVISION_DAEMON 5 /* Compile-time check */ #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON #error protocol version mismatch. Update your kernel headers #endif #define AC_PERMISSIONS 0 #define AC_MODLOAD 1 /* not supported by busybox */ #define AC_EXECUTE 2 #define AC_MFUNCTION 3 /* not supported by busybox */ #define AC_CFUNCTION 4 /* not supported by busybox */ #define AC_COPY 5 #define AC_IGNORE 6 #define AC_MKOLDCOMPAT 7 #define AC_MKNEWCOMPAT 8 #define AC_RMOLDCOMPAT 9 #define AC_RMNEWCOMPAT 10 #define AC_RESTORE 11 struct permissions_type { mode_t mode; uid_t uid; gid_t gid; }; struct execute_type { char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */ }; struct copy_type { const char *source; const char *destination; }; struct action_type { unsigned int what; unsigned int when; }; struct config_entry_struct { struct action_type action; regex_t preg; union { struct permissions_type permissions; struct execute_type execute; struct copy_type copy; } u; struct config_entry_struct *next; }; struct get_variable_info { const struct devfsd_notify_struct *info; const char *devname; char devpath[STRING_LENGTH]; }; static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *); static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned); static int mksymlink (const char *oldpath, const char *newpath); static void read_config_file (const char *path, int optional, unsigned long *event_mask); static void process_config_line (const char *, unsigned long *); static int do_servicing (int, unsigned long); static void service_name (const struct devfsd_notify_struct *); static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *); static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *, const regmatch_t *, unsigned); static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *, const regmatch_t *, unsigned); static void action_compat (const struct devfsd_notify_struct *, unsigned); static void free_config (void); static void do_restore (const char *, int); static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *); static mode_t get_mode (const char *); static void signal_handler (int); static const char *get_variable (const char *, void *); static void do_scan_and_service (const char *); static int make_dir_tree (const char *); static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *, const char *, const regmatch_t *, unsigned ); static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned ); static const char *expand_variable( char *, unsigned, unsigned *, const char *, const char *(*) (const char *, void *), void * ); static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *); static char get_old_ide_name (unsigned , unsigned); static char *write_old_sd_name (char *, unsigned, unsigned, char *); /* busybox functions */ static void msg_logger(int die, int pri, const char * fmt, ... ); static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag); static void fork_and_execute(int die, char *arg0, char **arg ); DIR * xopendir(int die, const char * dir_name); static int get_uid_gid ( int, const char *); static void safe_memcpy( char * dest, const char * src, int len); /* Structs and vars */ static struct config_entry_struct *first_config = NULL; static struct config_entry_struct *last_config = NULL; static const char *mount_point = NULL; static volatile int caught_signal = FALSE; static volatile int caught_sighup = FALSE; static struct initial_symlink_struct { char *dest; char *name; } initial_symlinks[] = { {"/proc/self/fd", "fd"}, {"fd/0", "stdin"}, {"fd/1", "stdout"}, {"fd/2", "stderr"}, {NULL, NULL}, }; static struct event_type { unsigned int type; /* The DEVFSD_NOTIFY_* value */ const char *config_name; /* The name used in the config file */ } event_types[] = { {DEVFSD_NOTIFY_REGISTERED, "REGISTER"}, {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"}, {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"}, {DEVFSD_NOTIFY_CLOSE, "CLOSE"}, {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"}, {DEVFSD_NOTIFY_CHANGE, "CHANGE"}, {DEVFSD_NOTIFY_CREATE, "CREATE"}, {DEVFSD_NOTIFY_DELETE, "DELETE"}, {0xffffffff, NULL} }; /* busybox functions and messages */ extern void xregcomp(regex_t * preg, const char *regex, int cflags); const char * const bb_msg_bad_config = "bad %s config file: %s\n"; const char * const bb_msg_proto_rev = "protocol revision"; #ifdef CONFIG_DEVFSD_VERBOSE const char * const bb_msg_small_buffer = "buffer too small\n"; const char * const bb_msg_variable_not_found= "variable: %s not found\n"; #endif static void msg_logger(int die, int pri, const char * fmt, ... ) { va_list ap; va_start(ap, fmt); if (access ("/dev/log", F_OK) == 0) { openlog(bb_applet_name, 0, LOG_DAEMON); vsyslog( pri , fmt , ap); closelog(); } #ifndef CONFIG_DEVFSD_VERBOSE else #endif bb_verror_msg(fmt, ap); va_end(ap); if(die==DIE) exit(EXIT_FAILURE); } static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag) { if (ioctl (fd, request, event_mask_flag) != 0) msg_logger(die, LOG_ERR, "ioctl() failed: %m\n"); } static void fork_and_execute(int die, char *arg0, char **arg ) { switch ( fork () ) { case 0: /* Child */ break; case -1: /* Parent: Error : die or return */ msg_logger(die, LOG_ERR,(char *) bb_msg_memory_exhausted); return; default: /* Parent : ok : return or exit */ if(arg0 != NULL) { wait (NULL); return; } exit (EXIT_SUCCESS); } /* Child : if arg0 != NULL do execvp */ if(arg0 != NULL ) { execvp (arg0, arg); msg_logger(DIE, LOG_ERR, "execvp() failed: %s: %m\n", arg0); } } DIR * xopendir(int die, const char * dir_name) { DIR *dp; if ( ( dp = opendir (dir_name) ) == NULL ) msg_logger( die, LOG_ERR, "opendir() failed: %s: %m\n", dir_name); /* if die == DIE not reached else return NULL */ return dp; } static void safe_memcpy( char *dest, const char *src, int len) { memcpy (dest , src , len ); dest[len] = '\0'; } /* Public functions follow */ int devfsd_main (int argc, char **argv) { int print_version = FALSE; int do_daemon = TRUE; int no_polling = FALSE; int fd, proto_rev, count; unsigned long event_mask = 0; struct sigaction new_action; struct initial_symlink_struct *curr; if (argc < 2) bb_show_usage(); for (count = 2; count < argc; ++count) { if (strcmp (argv[count], "-v") == 0) print_version = TRUE; else if (strcmp (argv[count], "-fg") == 0) do_daemon = FALSE; else if (strcmp (argv[count], "-np") == 0) no_polling = TRUE; else bb_show_usage(); } mount_point = argv[1]; if (chdir (mount_point) != 0) bb_error_msg_and_die( " %s: %m", mount_point); fd = bb_xopen (".devfsd", O_RDONLY); if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0) bb_error_msg( "FD_CLOEXEC"); do_ioctl(DIE, fd, DEVFSDIOC_GET_PROTO_REV,(int )&proto_rev); /*setup initial entries */ for (curr = initial_symlinks; curr->dest != NULL; ++curr) symlink (curr->dest, curr->name); /* NB: The check for CONFIG_FILE is done in read_config_file() */ if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) ) { bb_printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n", bb_applet_name,DEVFSD_VERSION,bb_msg_proto_rev, DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev); if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev); exit(EXIT_SUCCESS); /* -v */ } /* Tell kernel we are special (i.e. we get to see hidden entries) */ do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, 0); sigemptyset (&new_action.sa_mask); new_action.sa_flags = 0; /* Set up SIGHUP and SIGUSR1 handlers */ new_action.sa_handler = signal_handler; if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 ) bb_error_msg_and_die( "sigaction()"); bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point); /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */ umask (0); read_config_file (CONFIG_FILE, FALSE, &event_mask); /* Do the scan before forking, so that boot scripts see the finished product */ do_scan_and_service (mount_point); if (no_polling) exit (0); if (do_daemon) { /* Release so that the child can grab it */ do_ioctl(DIE, fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0); fork_and_execute(DIE, NULL, NULL); setsid (); /* Prevent hangups and become pgrp leader */ } else setpgid (0, 0); /* Become process group leader */ while (TRUE) { int do_scan = do_servicing (fd, event_mask); free_config (); read_config_file (CONFIG_FILE, FALSE, &event_mask); if (do_scan) do_scan_and_service (mount_point); } } /* End Function main */ /* Private functions follow */ static void read_config_file (const char *path, int optional, unsigned long *event_mask) /* [SUMMARY] Read a configuration database. The path to read the database from. If this is a directory, all entries in that directory will be read (except hidden entries). If TRUE, the routine will silently ignore a missing config file. The event mask is written here. This is not initialised. [RETURNS] Nothing. */ { struct stat statbuf; FILE *fp; char buf[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "read_config_file()\n"); #endif if (stat (path, &statbuf) != 0 || statbuf.st_size == 0 ) msg_logger((optional == 0 )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path); if ( S_ISDIR (statbuf.st_mode) ) { DIR *dp; struct dirent *de; dp = xopendir(DIE, path); while ( ( de = readdir (dp) ) != NULL ) { char fname[STRING_LENGTH]; if (de->d_name[0] == '.') continue; snprintf (fname, STRING_LENGTH, "%s/%s", path, de->d_name); read_config_file (fname, optional, event_mask); } closedir (dp); return; } if ( ( fp = fopen (path, "r") ) != NULL ) { while (fgets (buf, STRING_LENGTH, fp) != NULL) { char *line; buf[strlen (buf) - 1] = '\0'; /* Skip whitespace */ for (line = buf; isspace (*line); ++line) /*VOID*/; if (line[0] == '\0' || line[0] == '#' ) continue; process_config_line (line, event_mask); } fclose (fp); #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, "read config file: %s\n", path); #endif return; } msg_logger(( (optional == 0) && (errno == ENOENT) )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path); } /* End Function read_config_file */ static void process_config_line (const char *line, unsigned long *event_mask) /* [SUMMARY] Process a line from a configuration file. The configuration line. The event mask is written here. This is not initialised. [RETURNS] Nothing. */ { int num_args, count; struct config_entry_struct *new; char p[MAX_ARGS][STRING_LENGTH]; char when[STRING_LENGTH], what[STRING_LENGTH]; char name[STRING_LENGTH]; char * msg=""; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "process_config_line()\n"); #endif for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0'; num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s", when, name, what, p[0], p[1], p[2], p[3], p[4], p[5], p[6]); if (strcasecmp (when, "CLEAR_CONFIG") == 0) { free_config (); *event_mask = 0; return; } if (num_args < 2) goto process_config_line_err; if ( (strcasecmp (when, "INCLUDE") == 0) || (strcasecmp (when, "OPTIONAL_INCLUDE") == 0) ) { st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL ); read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask); return; } if (strcasecmp (when, "RESTORE") == 0) { do_restore ( name, strlen (name) ); return; } if (num_args < 3) goto process_config_line_err; new = xmalloc (sizeof *new); memset (new, 0, sizeof *new); for (count = 0; event_types[count].config_name != NULL; ++count) { if (strcasecmp (when, event_types[count].config_name) != 0) continue; new->action.when = event_types[count].type; break; } if (event_types[count].config_name == NULL) { msg="WHEN in"; goto process_config_line_err; } if (strcasecmp (what, "PERMISSIONS") == 0) { char *ptr; new->action.what = AC_PERMISSIONS; /* Get user and group */ if ( ( ptr = strchr (p[0], '.') ) == NULL ) { msg="UID.GID"; goto process_config_line_err; /*"missing '.' in UID.GID */ } *ptr++ = '\0'; new->u.permissions.uid = get_uid_gid (UID, p[0]); new->u.permissions.gid = get_uid_gid (GID, ptr); /* Get mode */ new->u.permissions.mode = get_mode (p[1]); } else if (strcasecmp (what, "EXECUTE") == 0) { new->action.what = AC_EXECUTE; num_args -= 3; for (count = 0; count < num_args; ++count) new->u.execute.argv[count] = bb_xstrdup (p[count]); new->u.execute.argv[num_args] = NULL; } else if (strcasecmp (what, "COPY") == 0) { new->action.what = AC_COPY; num_args -= 3; if (num_args != 2) goto process_config_line_err; /* missing path and function in line */ new->u.copy.source = bb_xstrdup (p[0]); new->u.copy.destination = bb_xstrdup (p[1]); } else if (strcasecmp (what, "IGNORE") == 0) new->action.what = AC_IGNORE; else if (strcasecmp (what, "MKOLDCOMPAT") == 0) new->action.what = AC_MKOLDCOMPAT; else if (strcasecmp (what, "MKNEWCOMPAT") == 0) new->action.what = AC_MKNEWCOMPAT; else if (strcasecmp (what, "RMOLDCOMPAT") == 0) new->action.what = AC_RMOLDCOMPAT; else if (strcasecmp (what, "RMNEWCOMPAT") == 0) new->action.what = AC_RMNEWCOMPAT; else { msg ="WHAT in"; goto process_config_line_err; } xregcomp( &new->preg, name, REG_EXTENDED); *event_mask |= 1 << new->action.when; new->next = NULL; if (first_config == NULL) first_config = new; else last_config->next = new; last_config = new; return; process_config_line_err: msg_logger( DIE, LOG_ERR, bb_msg_bad_config, msg , line); } /* End Function process_config_line */ static int do_servicing (int fd, unsigned long event_mask) /* [SUMMARY] Service devfs changes until a signal is received. The open control file. The event mask. [RETURNS] TRUE if SIGHUP was caught, else FALSE. */ { ssize_t bytes; struct devfsd_notify_struct info; unsigned long tmp_event_mask; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "do_servicing()\n"); #endif /* Tell devfs what events we care about */ tmp_event_mask = event_mask; /* May need to trap inode creates to watch for syslogd(8) starting */ /*if (!syslog_is_open && !no_syslog) { tmp_event_mask |= 1 << DEVFSD_NOTIFY_CREATE; *//*FIXME I'm not sure if this line is needed. TITO */ /*}*/ do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask); while (!caught_signal) { errno = 0; bytes = read (fd, (char *) &info, sizeof info); if (caught_signal) break; /* Must test for this first */ if (errno == EINTR) continue; /* Yes, the order is important */ if (bytes < 1) break; /* Special trap for "/dev/log" creation */ /* Open syslog, now that "/dev/log" exists */ /*if (!syslog_is_open && !no_syslog && (info.type == DEVFSD_NOTIFY_CREATE) &&(strcmp (info.devname, "log") == 0) ) { do_open_syslog (); do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, event_mask);*/ /*FIXME I'm not sure if this line is needed. TITO */ /*}*/ service_name (&info); } if (caught_signal) { int c_sighup = caught_sighup; caught_signal = FALSE; caught_sighup = FALSE; return (c_sighup); } #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_ERR, "read error on control file: %m\n"); #endif /* This is to shut up a compiler warning */ exit(1); } /* End Function do_servicing */ static void service_name (const struct devfsd_notify_struct *info) /* [SUMMARY] Service a single devfs change. The devfs change. [RETURNS] Nothing. */ { unsigned int n; regmatch_t mbuf[MAX_SUBEXPR]; struct config_entry_struct *entry; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "service_name()\n"); #endif #ifdef CONFIG_DEVFSD_VERBOSE if (info->overrun_count > 0) msg_logger( NO_DIE, LOG_ERR, "lost %u events\n", info->overrun_count); #endif /* Discard lookups on "/dev/log" and "/dev/initctl" */ if (info->type == DEVFSD_NOTIFY_LOOKUP && (( (strcmp (info->devname, "log") == 0) || (strcmp (info->devname, "initctl") == 0)))) return; for (entry = first_config; entry != NULL; entry = entry->next) { /* First check if action matches the type, then check if name matches */ if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 ) continue; for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n) /* VOID */; switch (entry->action.what) { case AC_PERMISSIONS: #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "AC_PERMISSIONS\n"); #endif action_permissions (info, entry); break; case AC_EXECUTE: #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "AC_EXECUTE\n"); #endif action_execute (info, entry, mbuf, n); break; case AC_COPY: #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "AC_COPY\n"); #endif action_copy (info, entry, mbuf, n); break; case AC_IGNORE: #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "AC_IGNORE\n"); #endif return; /*break;*/ case AC_MKOLDCOMPAT: case AC_MKNEWCOMPAT: case AC_RMOLDCOMPAT: case AC_RMNEWCOMPAT: #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "AC_COMPAT\n"); #endif action_compat (info, entry->action.what); break; default: msg_logger( DIE, LOG_ERR, "Unknown action\n"); /*break;*/ } } } /* End Function service_name */ static void action_permissions (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry) /* [SUMMARY] Update permissions for a device entry. The devfs change. The config file entry. [RETURNS] Nothing. */ { struct stat statbuf; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "action_permission()\n"); #endif if ( stat (info->devname, &statbuf) != 0 || chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 || chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_ERR, "chmod() or chown() error for: %s: %m\n",info->devname); #endif return; } } /* End Function action_permissions */ static void action_execute (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry, const regmatch_t *regexpr, unsigned int numexpr) /* [SUMMARY] Execute a programme. The devfs change. The config file entry. The number of subexpression (start, end) offsets within the device name. The number of elements within <>. [RETURNS] Nothing. */ { unsigned int count; struct get_variable_info gv_info; char *argv[MAX_ARGS + 1]; char largv[MAX_ARGS + 1][STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "action_execute()\n"); #endif gv_info.info = info; gv_info.devname = info->devname; snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname); for (count = 0; entry->u.execute.argv[count] != NULL; ++count) { expand_expression (largv[count], STRING_LENGTH, entry->u.execute.argv[count], get_variable, &gv_info, gv_info.devname, regexpr, numexpr ); argv[count] = largv[count]; } argv[count] = NULL; #ifdef CONFIG_DEVFSD_DEBUG int i; char buff[1024]; buff[0]='\0'; for(i=0;argv[i]!=NULL;i++) /* argv[i] < MAX_ARGS + 1 */ { strcat(buff," "); if( (strlen(buff)+ 1 + strlen(argv[i])) >= 1024) break; strcat(buff,argv[i]); } strcat(buff,"\n"); msg_logger( NO_DIE, LOG_INFO, "action_execute(): %s",buff); #endif fork_and_execute(NO_DIE, argv[0], argv); } /* End Function action_execute */ static void action_copy (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry, const regmatch_t *regexpr, unsigned int numexpr) /* [SUMMARY] Copy permissions. The devfs change. The config file entry. This list of subexpression (start, end) offsets within the device name. The number of elements in <>. [RETURNS] Nothing. */ { mode_t new_mode; struct get_variable_info gv_info; struct stat source_stat, dest_stat; char source[STRING_LENGTH], destination[STRING_LENGTH]; dest_stat.st_mode = 0; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "action_copy()\n"); #endif if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) ) return; gv_info.info = info; gv_info.devname = info->devname; snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname); expand_expression (source, STRING_LENGTH, entry->u.copy.source, get_variable, &gv_info, gv_info.devname, regexpr, numexpr); expand_expression (destination, STRING_LENGTH, entry->u.copy.destination, get_variable, &gv_info, gv_info.devname, regexpr, numexpr); if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0) goto action_copy_error; lstat (destination, &dest_stat); new_mode = source_stat.st_mode & ~S_ISVTX; if (info->type == DEVFSD_NOTIFY_CREATE) new_mode |= S_ISVTX; else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) ) new_mode |= S_ISVTX; #ifdef CONFIG_DEVFSD_VERBOSE if ( !copy_inode (destination, &dest_stat, new_mode, source, &source_stat) ) action_copy_error: msg_logger( NO_DIE, LOG_ERR, "error copying: %s to %s: %m\n", source, destination); #else copy_inode (destination, &dest_stat, new_mode, source,&source_stat); action_copy_error: return; #endif } /* End Function action_copy */ static void action_compat (const struct devfsd_notify_struct *info, unsigned int action) /* [SUMMARY] Process a compatibility request. The devfs change. The action to take. [RETURNS] Nothing. */ { const char *compat_name = NULL; const char *dest_name = info->devname; char *ptr; char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "action_compat()\n"); #endif /* First construct compatibility name */ switch (action) { case AC_MKOLDCOMPAT: case AC_RMOLDCOMPAT: compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor); break; case AC_MKNEWCOMPAT: case AC_RMNEWCOMPAT: if (strncmp (info->devname, "scsi/", 5) == 0) { int mode, host, bus, target, lun; sscanf (info->devname + 5, "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun); compat_name = compat_buf; snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname); dest_name = dest_buf; if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2)== 0) { char rewind_ = info->devname[info->namelen - 1]; if (rewind_ != 'n') rewind_ = '\0'; switch (ptr[2]) { default: mode = 0; break; case 'l': mode = 1; break; case 'm': mode = 2; break; case 'a': mode = 3; break; } sprintf (compat_buf, "st/c%db%dt%du%dm%d%c", host, bus, target, lun, mode, rewind_); } else if (strcmp (info->devname + info->namelen - 7,"generic") == 0) sprintf (compat_buf, "sg/c%db%dt%du%d", host, bus, target, lun); else if (strcmp (info->devname + info->namelen - 2, "cd") == 0) sprintf (compat_buf, "sr/c%db%dt%du%d", host, bus, target, lun); else if (strcmp (info->devname + info->namelen - 4, "disc") == 0) sprintf (compat_buf, "sd/c%db%dt%du%d", host, bus, target, lun); else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0) sprintf ( compat_buf, "sd/c%db%dt%du%dp%d", host, bus, target, lun, atoi (ptr + 4) ); else compat_name = NULL; } else if (strncmp (info->devname, "ide/host", 8) == 0) { int host, bus, target, lun; sscanf (info->devname + 4, "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun); compat_name = compat_buf; snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + 4); dest_name = dest_buf; if (strcmp (info->devname + info->namelen - 4, "disc") == 0) sprintf (compat_buf, "ide/hd/c%db%dt%du%d", host, bus, target, lun); else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0) sprintf ( compat_buf, "ide/hd/c%db%dt%du%dp%d", host, bus, target, lun, atoi (ptr + 4) ); else if (strcmp (info->devname + info->namelen - 2, "cd") == 0) sprintf (compat_buf, "ide/cd/c%db%dt%du%d", host, bus, target,lun); else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2) == 0) snprintf (compat_buf, sizeof (compat_buf), "ide/mt/c%db%dt%du%d%s", host, bus, target, lun, ptr + 2); else compat_name = NULL; } break; } if (compat_name == NULL) return; /* Now decide what to do with it */ switch (action) { case AC_MKOLDCOMPAT: case AC_MKNEWCOMPAT: mksymlink (dest_name, compat_name); break; case AC_RMOLDCOMPAT: case AC_RMNEWCOMPAT: #ifdef CONFIG_DEVFSD_VERBOSE if (unlink (compat_name) != 0) msg_logger( NO_DIE, LOG_ERR, "unlink(): %s: %m\n", compat_name); #else unlink (compat_name); #endif break; } } /* End Function action_compat */ static void do_restore (const char *dir_name, int rootlen) /* [SUMMARY] Restore state from a directory. The directory containing the backing store. The length of the root of the state directory hierarchy. [RETURNS] Nothing. */ { DIR *dp; struct dirent *de; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "do_restore()\n"); #endif if( (dp = xopendir(NO_DIE, dir_name))== NULL) return; while ( (de = readdir (dp) ) != NULL ) { char spath[STRING_LENGTH], dpath[STRING_LENGTH]; struct stat source_stat, dest_stat; dest_stat.st_mode = 0; if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) ) continue; snprintf (spath, sizeof spath, "%s/%s", dir_name, de->d_name); if (lstat (spath, &source_stat) != 0) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", spath); #endif continue; } snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen); lstat (dpath, &dest_stat); if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) ) copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat); if ( S_ISDIR (source_stat.st_mode) ) do_restore (spath, rootlen); } closedir (dp); } /* End Function do_restore */ static int copy_inode (const char *destpath, const struct stat *dest_stat, mode_t new_mode, const char *sourcepath, const struct stat *source_stat) /* [SUMMARY] Copy an inode. The destination path. An existing inode may be deleted. The destination stat(2) information. The desired new mode for the destination. The source path. The source stat(2) information. [RETURNS] TRUE on success, else FALSE. */ { #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "copy_inode()\n"); #endif if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) ) { /* Same type */ if ( S_ISLNK (source_stat->st_mode) ) { int source_len, dest_len; char source_link[STRING_LENGTH], dest_link[STRING_LENGTH]; if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 || ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 ) return (FALSE); source_link[source_len] = '\0'; dest_link[dest_len] = '\0'; if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) ) { unlink (destpath); symlink (source_link, destpath); } return (TRUE); } /* Else not a symlink */ chmod (destpath, new_mode & ~S_IFMT); chown (destpath, source_stat->st_uid, source_stat->st_gid); return (TRUE); } /* Different types: unlink and create */ unlink (destpath); switch (source_stat->st_mode & S_IFMT) { int fd, val; struct sockaddr_un un_addr; char symlink_val[STRING_LENGTH]; case S_IFSOCK: if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 ) break; un_addr.sun_family = AF_UNIX; snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath); val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr); close (fd); if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0) break; if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) return (TRUE); break; case S_IFLNK: if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 ) break; symlink_val[val] = '\0'; if (symlink (symlink_val, destpath) == 0) return (TRUE); break; case S_IFREG: if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 ) break; close (fd); if (chmod (destpath, new_mode & ~S_IFMT) != 0) break; if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) return (TRUE); break; case S_IFBLK: case S_IFCHR: case S_IFIFO: if (mknod (destpath, new_mode, source_stat->st_rdev) != 0) break; if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) return (TRUE); break; case S_IFDIR: if (mkdir (destpath, new_mode & ~S_IFMT) != 0) break; if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) return (TRUE); return (TRUE); /*break;*/ } return (FALSE); } /* End Function copy_inode */ static void free_config () /* [SUMMARY] Free the configuration information. [RETURNS] Nothing. */ { struct config_entry_struct *c_entry; void *next; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "free_config()\n"); #endif for (c_entry = first_config; c_entry != NULL; c_entry = next) { unsigned int count; next = c_entry->next; regfree (&c_entry->preg); if (c_entry->action.what == AC_EXECUTE) { for (count = 0; count < MAX_ARGS; ++count) { if (c_entry->u.execute.argv[count] == NULL) break; free (c_entry->u.execute.argv[count]); } } free (c_entry); } first_config = NULL; last_config = NULL; } /* End Function free_config */ static int get_uid_gid (int flag, const char *string) /* [SUMMARY] Convert a string to a UID or GID value. "UID" or "GID". The string. [RETURNS] The UID or GID value. */ { struct passwd *pw_ent; struct group *grp_ent; char * msg_a="user"; char * msg_b="U"; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_uid_gid()\n"); if(flag != UID && flag != GID ) msg_logger( DIE, LOG_ERR,"flag != UID && flag != GID\n"); #endif if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) ) return atoi (string); if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL ) return (pw_ent->pw_uid); if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL ) return (grp_ent->gr_gid); else { msg_a="group"; msg_b="G"; } msg_logger( NO_DIE, LOG_ERR,"unknown %s: %s, defaulting to %cID=0\n", msg_a, string, msg_b); return (0); }/* End Function get_uid_gid */ static mode_t get_mode (const char *string) /* [SUMMARY] Convert a string to a mode value. The string. [RETURNS] The mode value. */ { mode_t mode; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_mode()\n"); #endif if ( isdigit (string[0]) ) return strtoul (string, NULL, 8); if (strlen (string) != 9) msg_logger( DIE, LOG_ERR, "bad mode: %s\n", string); mode = 0; if (string[0] == 'r') mode |= S_IRUSR; if (string[1] == 'w') mode |= S_IWUSR; if (string[2] == 'x') mode |= S_IXUSR; if (string[3] == 'r') mode |= S_IRGRP; if (string[4] == 'w') mode |= S_IWGRP; if (string[5] == 'x') mode |= S_IXGRP; if (string[6] == 'r') mode |= S_IROTH; if (string[7] == 'w') mode |= S_IWOTH; if (string[8] == 'x') mode |= S_IXOTH; return (mode); } /* End Function get_mode */ static void signal_handler (int sig) { #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "signal_handler()\n"); #endif caught_signal = TRUE; if (sig == SIGHUP) caught_sighup = TRUE; #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, "Caught %s\n",(sig == SIGHUP)?"SIGHUP" : "SIGUSR1"); #endif } /* End Function signal_handler */ static const char *get_variable (const char *variable, void *info) { struct get_variable_info *gv_info = info; static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_variable()\n"); #endif if (gethostname (hostname, STRING_LENGTH - 1) != 0) msg_logger( DIE, LOG_ERR, "gethostname(): %m\n"); /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */ hostname[STRING_LENGTH - 1] = '\0'; if (strcmp (variable, "hostname") == 0) return (hostname); if (strcmp (variable, "mntpnt") == 0) return (mount_point); if (gv_info == NULL) return (NULL); if (strcmp (variable, "devpath") == 0) return (gv_info->devpath); if (strcmp (variable, "devname") == 0) return (gv_info->devname); if (strcmp (variable, "mode") == 0) { sprintf (sbuf, "%o", gv_info->info->mode); return (sbuf); } if (strcmp (variable, "uid") == 0) { sprintf (sbuf, "%u", gv_info->info->uid); return (sbuf); } if (strcmp (variable, "gid") == 0) { sprintf (sbuf, "%u", gv_info->info->gid); return (sbuf); } return (NULL); } /* End Function get_variable */ static void do_scan_and_service (const char *dir_name) /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes. The directory pointer. This is closed upon completion. The name of the directory. [RETURNS] Nothing. */ { struct stat statbuf; DIR *dp; struct dirent *de; char path[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "do_scan_and_service ()\n"); #endif if((dp = xopendir(NO_DIE, dir_name))==NULL) return; while ( (de = readdir (dp) ) != NULL ) { struct devfsd_notify_struct info; if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) ) continue; snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name); if (lstat (path, &statbuf) != 0) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", path); #endif continue; } memset (&info, 0, sizeof info); info.type = DEVFSD_NOTIFY_REGISTERED; info.mode = statbuf.st_mode; info.major = MAJOR (statbuf.st_rdev); info.minor = MINOR (statbuf.st_rdev); info.uid = statbuf.st_uid; info.gid = statbuf.st_gid; snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1); info.namelen = strlen (info.devname); service_name (&info); if ( S_ISDIR (statbuf.st_mode) ) do_scan_and_service (path); } closedir (dp); } /* End Function do_scan_and_service */ static int mksymlink (const char *oldpath, const char *newpath) /* [SUMMARY] Create a symlink, creating intervening directories as required. The string contained in the symlink. The name of the new symlink. [RETURNS] 0 on success, else -1. */ { #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "mksymlink()\n", newpath); #endif if ( !make_dir_tree (newpath) ) return (-1); if (symlink (oldpath, newpath) != 0) { #ifdef CONFIG_DEVFSD_VERBOSE if (errno == EEXIST) msg_logger( NO_DIE, LOG_INFO, "symlink(): %s: already exists\n", newpath); else { msg_logger( NO_DIE, LOG_ERR, "symlink(): %s: %m\n", newpath); return (-1); } #else if (errno != EEXIST) return (-1); #endif } return (0); } /* End Function mksymlink */ static int make_dir_tree (const char *path) /* [SUMMARY] Creating intervening directories for a path as required. The full pathname (including he leaf node). [RETURNS] TRUE on success, else FALSE. */ { #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "make_dir_tree()\n"); #endif if (bb_make_directory( (char *)path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH , FILEUTILS_RECUR )==-1) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_ERR, "make_dir_tree(): %s: %m\n", path); #endif return (FALSE); } return(TRUE); } /* End Function make_dir_tree */ static int expand_expression(char *output, unsigned int outsize, const char *input, const char *(*get_variable_func)(const char *variable, void *info), void *info, const char *devname, const regmatch_t *ex, unsigned int numexp) /* [SUMMARY] Expand enviroment variables and regular subexpressions in string. The output expanded expression is written here. The size of the output buffer. The input expression. This may equal <>. A function which will be used to get variable values. If this returns NULL, the environment is searched instead. If this is NULL, only the environment is searched. An arbitrary pointer passed to <>. Device name; specifically, this is the string that contains all of the regular subexpressions. Array of start / end offsets into info->devname for each subexpression Number of regular subexpressions found in <>. [RETURNS] TRUE on success, else FALSE. */ { char temp[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "expand_expression()\n"); #endif if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) ) return (FALSE); expand_regexp (output, outsize, temp, devname, ex, numexp); return (TRUE); } /* End Function expand_expression */ static void expand_regexp (char *output, size_t outsize, const char *input, const char *devname, const regmatch_t *ex, unsigned int numex ) /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9. The output expanded expression is written here. The size of the output buffer. The input expression. This may NOT equal <>, because supporting that would require yet another string-copy. However, it's not hard to write a simple wrapper function to add this functionality for those few cases that need it. Device name; specifically, this is the string that contains all of the regular subexpressions. An array of start and end offsets into <>, one for each subexpression Number of subexpressions in the offset-array <>. [RETURNS] Nothing. */ { const char last_exp = '0' - 1 + numex; int c = -1; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "expand_regexp()\n"); #endif /* Guarantee NULL termination by writing an explicit '\0' character into the very last byte */ if (outsize) output[--outsize] = '\0'; /* Copy the input string into the output buffer, replacing '\\' with '\' and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x codes are deleted */ while ( (c != '\0') && (outsize != 0) ) { c = *input; ++input; if (c == '\\') { c = *input; ++input; if (c != '\\') { if ((c >= '0') && (c <= last_exp)) { const regmatch_t *subexp = ex + (c - '0'); unsigned int sublen = subexp->rm_eo - subexp->rm_so; /* Range checking */ if (sublen > outsize) sublen = outsize; strncpy (output, devname + subexp->rm_so, sublen); output += sublen; outsize -= sublen; } continue; } } *output = c; ++output; --outsize; } /* while */ } /* End Function expand_regexp */ /* from compat_name.c */ struct translate_struct { char *match; /* The string to match to (up to length) */ char *format; /* Format of output, "%s" takes data past match string, NULL is effectively "%s" (just more efficient) */ }; static struct translate_struct translate_table[] = { {"sound/", NULL}, {"printers/", "lp%s"}, {"v4l/", NULL}, {"parports/", "parport%s"}, {"fb/", "fb%s"}, {"netlink/", NULL}, {"loop/", "loop%s"}, {"floppy/", "fd%s"}, {"rd/", "ram%s"}, {"md/", "md%s"}, /* Meta-devices */ {"vc/", "tty%s"}, {"misc/", NULL}, {"isdn/", NULL}, {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/ {"i2c/", "i2c-%s"}, {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */ {"tts/E", "ttyE%s"}, /* Stallion serial driver */ {"cua/E", "cue%s"}, /* Stallion serial driver callout */ {"tts/R", "ttyR%s"}, /* Rocketport serial driver */ {"cua/R", "cur%s"}, /* Rocketport serial driver callout */ {"ip2/", "ip2%s"}, /* Computone serial driver control */ {"tts/F", "ttyF%s"}, /* Computone serial driver */ {"cua/F", "cuf%s"}, /* Computone serial driver callout */ {"tts/C", "ttyC%s"}, /* Cyclades serial driver */ {"cua/C", "cub%s"}, /* Cyclades serial driver callout */ {"tts/", "ttyS%s"}, /* Generic serial: must be after others */ {"cua/", "cua%s"}, /* Generic serial: must be after others */ {"input/js", "js%s"}, /* Joystick driver */ {NULL, NULL} }; const char *get_old_name (const char *devname, unsigned int namelen, char *buffer, unsigned int major, unsigned int minor) /* [SUMMARY] Translate a kernel-supplied name into an old name. The device name provided by the kernel. The length of the name. A buffer that may be used. This should be at least 128 bytes long. The major number for the device. The minor number for the device. [RETURNS] A pointer to the old name if known, else NULL. */ { const char *compat_name = NULL; char *ptr; struct translate_struct *trans; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_old_name()\n"); #endif for (trans = translate_table; trans->match != NULL; ++trans) { size_t len = strlen (trans->match); if (strncmp (devname, trans->match, len) == 0) { if (trans->format == NULL) return (devname + len); sprintf (buffer, trans->format, devname + len); return (buffer); } } if (strncmp (devname, "sbp/", 4) == 0) { sprintf (buffer, "sbpcd%u", minor); compat_name = buffer; } else if (strncmp (devname, "scsi/", 5) == 0) { /* All SCSI devices */ if (strcmp (devname + namelen - 7, "generic") == 0) { sprintf (buffer, "sg%u", minor); compat_name = buffer; } else if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0) { char mode = ptr[2]; if (mode == 'n') mode = '\0'; sprintf (buffer, "nst%u%c", minor & 0x1f, mode); compat_name = buffer; if (devname[namelen - 1] != 'n') ++compat_name; } else if (strcmp (devname + namelen - 2, "cd") == 0) { sprintf (buffer, "sr%u", minor); compat_name = buffer; } else if (strcmp (devname + namelen - 4, "disc") == 0) compat_name = write_old_sd_name (buffer, major, minor, ""); else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0) compat_name = write_old_sd_name (buffer, major, minor, ptr + 4); return (compat_name); } else if (strncmp (devname, "ide/host", 8) == 0) { /* All IDE devices */ if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0) { sprintf (buffer, "%sht%d", ptr + 2, minor & 0x7f); compat_name = buffer; } else if (strcmp (devname + namelen - 4, "disc") == 0) { sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) ); compat_name = buffer; } else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0) { sprintf (buffer, "hd%c%s", get_old_ide_name (major, minor), ptr + 4); compat_name = buffer; } else if (strcmp (devname + namelen - 2, "cd") == 0) { sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) ); compat_name = buffer; } return (compat_name); } else if (strncmp (devname, "vcc/", 4) == 0) { sprintf (buffer, "vcs%s", devname + 4); if (buffer[3] == '0') buffer[3] = '\0'; compat_name = buffer; } else if (strncmp (devname, "pty/", 4) == 0) { int indexx = atoi (devname + 5); const char *pty1 = "pqrstuvwxyzabcde"; const char *pty2 = "0123456789abcdef"; sprintf (buffer, "%cty%c%c", (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]); compat_name = buffer; } return (compat_name); } /* End Function get_old_name */ static char get_old_ide_name (unsigned int major, unsigned int minor) /* [SUMMARY] Get the old IDE name for a device. The major number for the device. The minor number for the device. [RETURNS] The drive letter. */ { char letter='y'; /* 121 */ char c='a'; /* 97 */ int i=IDE0_MAJOR; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_old_ide_name()\n"); #endif /* I hope it works like the previous code as it saves a few bytes. Tito ;P */ do { if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR || i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR || i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR || i==IDE9_MAJOR ) { if(i==major) { letter=c; break; } c+=2; } i++; } while(i<=IDE9_MAJOR); if (minor > 63) ++letter; return (letter); } /* End Function get_old_ide_name */ static char *write_old_sd_name (char *buffer, unsigned int major, unsigned int minor, char *part) /* [SUMMARY] Write the old SCSI disc name to a buffer. The buffer to write to. The major number for the device. The minor number for the device. The partition string. Must be "" for a whole-disc entry. [RETURNS] A pointer to the buffer on success, else NULL. */ { unsigned int disc_index; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "write_old_sd_name()\n"); #endif if (major == 8) { sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part); return (buffer); } if ( (major > 64) && (major < 72) ) { disc_index = ( (major - 64) << 4 ) + (minor >> 4); if (disc_index < 26) sprintf (buffer, "sd%c%s", 'a' + disc_index, part); else sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part); return (buffer); } return (NULL); } /* End Function write_old_sd_name */ /* expression.c */ /*EXPERIMENTAL_FUNCTION*/ int st_expr_expand (char *output, unsigned int length, const char *input, const char *(*get_variable_func) (const char *variable, void *info), void *info) /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules. The output expanded expression is written here. The size of the output buffer. The input expression. This may equal <>. A function which will be used to get variable values. If this returns NULL, the environment is searched instead. If this is NULL, only the environment is searched. An arbitrary pointer passed to <>. [RETURNS] TRUE on success, else FALSE. */ { char ch; unsigned int len; unsigned int out_pos = 0; const char *env; const char *ptr; struct passwd *pwent; char buffer[BUFFER_SIZE], tmp[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "st_expr_expand()\n"); #endif if (length > BUFFER_SIZE) length = BUFFER_SIZE; for (; TRUE; ++input) { switch (ch = *input) { case '$': /* Variable expansion */ input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info); if (input == NULL) return (FALSE); break; case '~': /* Home directory expansion */ ch = input[1]; if ( isspace (ch) || (ch == '/') || (ch == '\0') ) { /* User's own home directory: leave separator for next time */ if ( ( env = getenv ("HOME") ) == NULL ) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, "HOME"); #endif return (FALSE); } len = strlen (env); if (len + out_pos >= length) goto st_expr_expand_out; memcpy (buffer + out_pos, env, len + 1); out_pos += len; continue; } /* Someone else's home directory */ for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr) /* VOID */ ; len = ptr - input; if (len >= sizeof tmp) goto st_expr_expand_out; safe_memcpy (tmp, input, len); input = ptr - 1; if ( ( pwent = getpwnam (tmp) ) == NULL ) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, "getpwnam(): %s\n", tmp); #endif return (FALSE); } len = strlen (pwent->pw_dir); if (len + out_pos >= length) goto st_expr_expand_out; memcpy (buffer + out_pos, pwent->pw_dir, len + 1); out_pos += len; break; case '\0': /* Falltrough */ default: if (out_pos >= length) goto st_expr_expand_out; buffer[out_pos++] = ch; if (ch == '\0') { memcpy (output, buffer, out_pos); return (TRUE); } break; /* esac */ } } return (FALSE); st_expr_expand_out: #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer); #endif return (FALSE); } /* End Function st_expr_expand */ /* Private functions follow */ static const char *expand_variable (char *buffer, unsigned int length, unsigned int *out_pos, const char *input, const char *(*func) (const char *variable, void *info), void *info) /* [SUMMARY] Expand a variable. The buffer to write to. The length of the output buffer. The current output position. This is updated. A pointer to the input character pointer. A function which will be used to get variable values. If this returns NULL, the environment is searched instead. If this is NULL, only the environment is searched. An arbitrary pointer passed to <>. Diagnostic messages are written here. [RETURNS] A pointer to the end of this subexpression on success, else NULL. */ { char ch; int len; unsigned int open_braces; const char *env, *ptr; char tmp[STRING_LENGTH]; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "expand_variable()\n"); #endif ch = input[0]; if (ch == '$') { /* Special case for "$$": PID */ sprintf ( tmp, "%d", (int) getpid () ); len = strlen (tmp); if (len + *out_pos >= length) goto expand_variable_out; memcpy (buffer + *out_pos, tmp, len + 1); out_pos += len; return (input); } /* Ordinary variable expansion, possibly in braces */ if (ch != '{') { /* Simple variable expansion */ for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr) /* VOID */ ; len = ptr - input; if (len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); input = ptr - 1; if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL ) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, tmp); #endif return (NULL); } len = strlen (env); if (len + *out_pos >= length) goto expand_variable_out; memcpy (buffer + *out_pos, env, len + 1); *out_pos += len; return (input); } /* Variable in braces: check for ':' tricks */ ch = *++input; for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr) /* VOID */; if (ch == '}') { /* Must be simple variable expansion with "${var}" */ len = ptr - input; if (len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); ptr = expand_variable (buffer, length, out_pos, tmp, func, info ); if (ptr == NULL) return (NULL); return (input + len); } if (ch != ':' || ptr[1] != '-' ) { #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO,"illegal char in var name\n"); #endif return (NULL); } /* It's that handy "${var:-word}" expression. Check if var is defined */ len = ptr - input; if (len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); /* Move input pointer to ':' */ input = ptr; /* First skip to closing brace, taking note of nested expressions */ ptr += 2; ch = ptr[0]; for (open_braces = 1; open_braces > 0; ch = *++ptr) { switch (ch) { case '{': ++open_braces; break; case '}': --open_braces; break; case '\0': #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO,"\"}\" not found in: %s\n", input); #endif return (NULL); default: break; } } --ptr; /* At this point ptr should point to closing brace of "${var:-word}" */ if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL ) { /* Found environment variable, so skip the input to the closing brace and return the variable */ input = ptr; len = strlen (env); if (len + *out_pos >= length) goto expand_variable_out; memcpy (buffer + *out_pos, env, len + 1); *out_pos += len; return (input); } /* Environment variable was not found, so process word. Advance input pointer to start of word in "${var:-word}" */ input += 2; len = ptr - input; if (len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); input = ptr; if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) ) return (NULL); len = strlen (tmp); if (len + *out_pos >= length) goto expand_variable_out; memcpy (buffer + *out_pos, tmp, len + 1); *out_pos += len; return (input); expand_variable_out: #ifdef CONFIG_DEVFSD_VERBOSE msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer); #endif return (NULL); } /* End Function expand_variable */ static const char *get_variable_v2 (const char *variable, const char *(*func) (const char *variable, void *info), void *info) /* [SUMMARY] Get a variable from the environment or . The variable name. A function which will be used to get the variable. If this returns NULL, the environment is searched instead. If this is NULL, only the environment is searched. [RETURNS] The value of the variable on success, else NULL. */ { const char *value; #ifdef CONFIG_DEVFSD_DEBUG msg_logger( NO_DIE, LOG_INFO, "get_variable_v2()\n"); #endif if (func != NULL) { value = (*func) (variable, info); if (value != NULL) return (value); } return getenv (variable); } /* End Function get_variable */ /* END OF CODE */