/* vi: set sw=4 ts=4: */ /* * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ /* devfsd implementation for busybox Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it> 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 <sys/wait.h> //#include <sys/ioctl.h> //#include <sys/socket.h> #include <sys/un.h> #include <dirent.h> #include <syslog.h> #include <sys/sysmacros.h> #include "libbb.h" #include "xregex.h" /* Various defines taken from linux/major.h */ #define IDE0_MAJOR 3 #define IDE1_MAJOR 22 #define IDE2_MAJOR 33 #define IDE3_MAJOR 34 #define IDE4_MAJOR 56 #define IDE5_MAJOR 57 #define IDE6_MAJOR 88 #define IDE7_MAJOR 89 #define IDE8_MAJOR 90 #define IDE9_MAJOR 91 /* Various defines taken from linux/devfs_fs.h */ #define DEVFSD_PROTOCOL_REVISION_KERNEL 5 #define DEVFSD_IOCTL_BASE 'd' /* These are the various ioctls */ #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int) #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int) #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int) #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int) #define DEVFSD_NOTIFY_REGISTERED 0 #define DEVFSD_NOTIFY_UNREGISTERED 1 #define DEVFSD_NOTIFY_ASYNC_OPEN 2 #define DEVFSD_NOTIFY_CLOSE 3 #define DEVFSD_NOTIFY_LOOKUP 4 #define DEVFSD_NOTIFY_CHANGE 5 #define DEVFSD_NOTIFY_CREATE 6 #define DEVFSD_NOTIFY_DELETE 7 #define DEVFS_PATHLEN 1024 /* Never change this otherwise the binary interface will change */ struct devfsd_notify_struct { /* Use native C types to ensure same types in kernel and user space */ unsigned int type; /* DEVFSD_NOTIFY_* value */ unsigned int mode; /* Mode of the inode or device entry */ unsigned int major; /* Major number of device entry */ unsigned int minor; /* Minor number of device entry */ unsigned int uid; /* Uid of process, inode or device entry */ unsigned int gid; /* Gid of process, inode or device entry */ unsigned int overrun_count; /* Number of lost events */ unsigned int namelen; /* Number of characters not including '\0' */ /* The device name MUST come last */ char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */ }; #define BUFFER_SIZE 16384 #define DEVFSD_VERSION "1.3.25" #define CONFIG_FILE "/etc/devfsd.conf" #define MODPROBE "/sbin/modprobe" #define MODPROBE_SWITCH_1 "-k" #define MODPROBE_SWITCH_2 "-C" #define CONFIG_MODULES_DEVFS "/etc/modules.devfs" #define MAX_ARGS (6 + 1) #define MAX_SUBEXPR 10 #define STRING_LENGTH 255 /* for get_uid_gid() */ #define UID 0 #define GID 1 /* fork_and_execute() */ # define DIE 1 # define NO_DIE 0 /* for dir_operation() */ #define RESTORE 0 #define SERVICE 1 #define READ_CONFIG 2 /* 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 #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 void dir_operation(int , const char * , int, unsigned long* ); static void service(struct stat statbuf, char *path); 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 (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_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry); 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 restore(char *spath, struct stat source_stat, int rootlen); 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 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, const char *); /* busybox functions */ static void msg_logger(int pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3))); static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3))); static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag); static void fork_and_execute(int die, char *arg0, char **arg ); static int get_uid_gid ( int, const char *); static void safe_memcpy( char * dest, const char * src, int len); static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr); static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr); /* 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 { const char *dest; const 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 messages */ static const char * const bb_msg_proto_rev = "protocol revision"; static const char * const bb_msg_bad_config = "bad %s config file: %s"; static const char * const bb_msg_small_buffer = "buffer too small"; static const char * const bb_msg_variable_not_found = "variable: %s not found"; /* Busybox functions */ static void msg_logger(int pri, const char * fmt, ... ) { va_list ap; int ret; va_start(ap, fmt); ret = access ("/dev/log", F_OK); if (ret == 0) { openlog(applet_name, 0, LOG_DAEMON); vsyslog( pri , fmt, ap); /* Man: A trailing newline is added when needed. */ closelog(); } /* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */ if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) { bb_error_msg(fmt, ap); } va_end(ap); } static void msg_logger_and_die(int pri, const char* fmt, ...) { va_list ap; va_start(ap, fmt); msg_logger(pri, fmt, ap); va_end(ap); exit(EXIT_FAILURE); } /* Busybox stuff */ #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG) #define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args) #define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args) #define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args) #if defined(CONFIG_DEBUG) #define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args) #else #define debug_msg_logger(x, fmt, args...) #endif #else #define debug_msg_logger(x, fmt, args...) #define msg_logger(p, fmt, args...) #define msg_logger_and_die(p, fmt, args...) exit(1) #define devfsd_perror_msg_and_die(fmt, args...) exit(1) #define devfsd_error_msg_and_die(fmt, args...) exit(1) #define devfsd_error_msg(fmt, args...) #endif static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag) { if (ioctl (fd, request, event_mask_flag) == -1) msg_logger_and_die(LOG_ERR, "ioctl"); } 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(LOG_ERR,(char *) bb_msg_memory_exhausted); if(die) exit(EXIT_FAILURE); 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 ) { BB_EXECVP(arg0, arg); msg_logger_and_die(LOG_ERR, "execvp"); } } static void safe_memcpy( char *dest, const char *src, int len) { memcpy (dest , src , len ); dest[len] = '\0'; } static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr) { if(d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c') return 2 + addendum; if(d[n - 2]=='c' && d[n - 1]=='d') return 3 + addendum; if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t') return 4 + addendum; if(ptr[n - 2]=='m' && ptr[n - 1]=='t') return 5 + addendum; return 0; } static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr) { if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/') { if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' && d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' && d[n - 1]=='c' ) return 1; return scan_dev_name_common(d, n, 0, ptr); } if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' && d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t') return scan_dev_name_common(d, n, 4, ptr); if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/') return 10; if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/') return 11; if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/') return 12; return 0; } /* Public functions follow */ int devfsd_main (int argc, char **argv); int devfsd_main (int argc, char **argv) { int print_version = FALSE; int do_daemon = TRUE; int no_polling = FALSE; int do_scan; 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(argv[count][0] == '-') { if(argv[count][1]=='v' && !argv[count][2]) /* -v */ print_version = TRUE; else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f' && argv[count][2]=='g' && !argv[count][3]) /* -fg */ do_daemon = FALSE; else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n' && argv[count][2]=='p' && !argv[count][3]) /* -np */ no_polling = TRUE; else bb_show_usage(); } } /* strip last / from mount point, so we don't need to check for it later */ while (argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' ) argv[1][strlen(argv[1]) -1] = '\0'; mount_point = argv[1]; if (chdir (mount_point) != 0) devfsd_perror_msg_and_die(mount_point); fd = xopen (".devfsd", O_RDONLY); if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0) devfsd_perror_msg_and_die("FD_CLOEXEC"); if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1) msg_logger_and_die(LOG_ERR, "ioctl"); /*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)) { printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n", 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_and_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 ) devfsd_error_msg_and_die( "sigaction"); printf("%s v%s started for %s\n",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((char*)CONFIG_FILE, FALSE, &event_mask); /* Do the scan before forking, so that boot scripts see the finished product */ dir_operation(SERVICE,mount_point,0,NULL); if (ENABLE_DEVFSD_FG_NP && no_polling) exit (0); if (do_daemon) { /* Release so that the child can grab it */ do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0); fork_and_execute(DIE, NULL, NULL); setsid (); /* Prevent hangups and become pgrp leader */ } else if(ENABLE_DEVFSD_FG_NP) { setpgid (0, 0); /* Become process group leader */ } while (TRUE) { do_scan = do_servicing (fd, event_mask); free_config (); read_config_file ((char*)CONFIG_FILE, FALSE, &event_mask); if (do_scan) dir_operation(SERVICE,mount_point,0,NULL); } } /* End Function main */ /* Private functions follow */ static void read_config_file (char *path, int optional, unsigned long *event_mask) /* [SUMMARY] Read a configuration database. <path> The path to read the database from. If this is a directory, all entries in that directory will be read (except hidden entries). <optional> If TRUE, the routine will silently ignore a missing config file. <event_mask> The event mask is written here. This is not initialised. [RETURNS] Nothing. */ { struct stat statbuf; FILE *fp; char buf[STRING_LENGTH]; char *line = NULL; debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path); if (stat (path, &statbuf) == 0 ) { /* Don't read 0 length files: ignored */ /*if( statbuf.st_size == 0 ) return;*/ if ( S_ISDIR (statbuf.st_mode) ) { /* strip last / from dirname so we don't need to check for it later */ while (path && path[1]!='\0' && path[strlen(path)-1] == '/') path[strlen(path) -1] = '\0'; dir_operation(READ_CONFIG, path, 0, event_mask); return; } if ( ( fp = fopen (path, "r") ) != NULL ) { while (fgets (buf, STRING_LENGTH, fp) != NULL) { /* Skip whitespace */ for (line = buf; isspace (*line); ++line) /*VOID*/; if (line[0] == '\0' || line[0] == '#' ) continue; process_config_line (line, event_mask); } fclose (fp); } else { goto read_config_file_err; } } else { read_config_file_err: if(optional == 0 && errno == ENOENT) msg_logger_and_die(LOG_ERR, "read config file: %s: %m", 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. <line> The configuration line. <event_mask> 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]; const char *msg = ""; char *ptr; int i; /* !!!! Only Uppercase Keywords in devsfd.conf */ static const char *const options[] = { "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE", "RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE", "COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT", "RMOLDCOMPAT", "RMNEWCOMPAT", 0 }; debug_msg_logger(LOG_INFO, __FUNCTION__); 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]); i = index_in_str_array(options, when ); /*"CLEAR_CONFIG"*/ if( i == 0) { free_config (); *event_mask = 0; return; } if ( num_args < 2) goto process_config_line_err; /* "INCLUDE" & "OPTIONAL_INCLUDE" */ if( i == 1 || i == 2 ) { st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL ); msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name); read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask); return; } /* "RESTORE" */ if( i == 3) { dir_operation(RESTORE,name, strlen (name),NULL); 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; } i = index_in_str_array(options, what ); switch (i) { case 4: /* "PERMISSIONS" */ 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]); break; case 5: /* MODLOAD */ /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to the device name) to the module loading facility. In addition, the /etc/modules.devfs configuration file is used.*/ if (ENABLE_DEVFSD_MODLOAD) new->action.what = AC_MODLOAD; break; case 6: /* EXECUTE */ new->action.what = AC_EXECUTE; num_args -= 3; for (count = 0; count < num_args; ++count) new->u.execute.argv[count] = xstrdup (p[count]); new->u.execute.argv[num_args] = NULL; break; case 7: /* COPY */ 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 = xstrdup (p[0]); new->u.copy.destination = xstrdup (p[1]); break; case 8: /* IGNORE */ /* FALLTROUGH */ case 9: /* MKOLDCOMPAT */ /* FALLTROUGH */ case 10: /* MKNEWCOMPAT */ /* FALLTROUGH */ case 11:/* RMOLDCOMPAT */ /* FALLTROUGH */ case 12: /* RMNEWCOMPAT */ /* AC_IGNORE 6 AC_MKOLDCOMPAT 7 AC_MKNEWCOMPAT 8 AC_RMOLDCOMPAT 9 AC_RMNEWCOMPAT 10*/ new->action.what = i - 2; break; default: msg ="WHAT in"; goto process_config_line_err; /*esac*/ } /* switch (i) */ 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_and_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. <fd> The open control file. <event_mask> The event mask. [RETURNS] TRUE if SIGHUP was caught, else FALSE. */ { ssize_t bytes; struct devfsd_notify_struct info; unsigned long tmp_event_mask; debug_msg_logger(LOG_INFO, __FUNCTION__); /* Tell devfs what events we care about */ tmp_event_mask = event_mask; do_ioctl_and_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; service_name (&info); } if (caught_signal) { int c_sighup = caught_sighup; caught_signal = FALSE; caught_sighup = FALSE; return c_sighup; } msg_logger_and_die(LOG_ERR, "read error on control file"); } /* End Function do_servicing */ static void service_name (const struct devfsd_notify_struct *info) /* [SUMMARY] Service a single devfs change. <info> The devfs change. [RETURNS] Nothing. */ { unsigned int n; regmatch_t mbuf[MAX_SUBEXPR]; struct config_entry_struct *entry; debug_msg_logger(LOG_INFO, __FUNCTION__); if (ENABLE_DEBUG && info->overrun_count > 0) debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count); /* Discard lookups on "/dev/log" and "/dev/initctl" */ if( info->type == DEVFSD_NOTIFY_LOOKUP && ((info->devname[0]=='l' && info->devname[1]=='o' && info->devname[2]=='g' && !info->devname[3]) || ( info->devname[0]=='i' && info->devname[1]=='n' && info->devname[2]=='i' && info->devname[3]=='t' && info->devname[4]=='c' && info->devname[5]=='t' && info->devname[6]=='l' && !info->devname[7]))) 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 */; debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what); switch (entry->action.what) { case AC_PERMISSIONS: action_permissions (info, entry); break; case AC_MODLOAD: if(ENABLE_DEVFSD_MODLOAD) action_modload (info, entry); break; case AC_EXECUTE: action_execute (info, entry, mbuf, n); break; case AC_COPY: action_copy (info, entry, mbuf, n); break; case AC_IGNORE: return; /*break;*/ case AC_MKOLDCOMPAT: case AC_MKNEWCOMPAT: case AC_RMOLDCOMPAT: case AC_RMNEWCOMPAT: action_compat (info, entry->action.what); break; default: msg_logger_and_die(LOG_ERR, "Unknown action"); } } } /* 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. <info> The devfs change. <entry> The config file entry. [RETURNS] Nothing. */ { struct stat statbuf; debug_msg_logger(LOG_INFO, __FUNCTION__); 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) { msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname); } } /* End Function action_permissions */ static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry ATTRIBUTE_UNUSED) /* [SUMMARY] Load a module. <info> The devfs change. <entry> The config file entry. [RETURNS] Nothing. */ { char *argv[6]; char device[STRING_LENGTH]; argv[0] = (char*)MODPROBE; argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */ argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */ argv[3] = (char*)CONFIG_MODULES_DEVFS; argv[4] = device; argv[5] = NULL; snprintf (device, sizeof (device), "/dev/%s", info->devname); debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]); fork_and_execute(DIE, argv[0], argv); } /* End Function action_modload */ 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. <info> The devfs change. <entry> The config file entry. <regexpr> The number of subexpression (start, end) offsets within the device name. <numexpr> The number of elements within <<regexpr>>. [RETURNS] Nothing. */ { unsigned int count; struct get_variable_info gv_info; char *argv[MAX_ARGS + 1]; char largv[MAX_ARGS + 1][STRING_LENGTH]; debug_msg_logger(LOG_INFO ,__FUNCTION__); 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; 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. <info> The devfs change. <entry> The config file entry. <regexpr> This list of subexpression (start, end) offsets within the device name. <numexpr> The number of elements in <<regexpr>>. [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]; int ret = 0; debug_msg_logger(LOG_INFO, __FUNCTION__); dest_stat.st_mode = 0; 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) return; 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; ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat); if (ENABLE_DEBUG && ret && (errno != EEXIST)) debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination); } /* End Function action_copy */ static void action_compat (const struct devfsd_notify_struct *info, unsigned int action) /* [SUMMARY] Process a compatibility request. <info> The devfs change. <action> The action to take. [RETURNS] Nothing. */ { int ret; const char *compat_name = NULL; const char *dest_name = info->devname; char *ptr=NULL; char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH]; int mode, host, bus, target, lun; unsigned int i; char rewind_; /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */ static const char *const fmt[] = { NULL , "sg/c%db%dt%du%d", /* scsi/generic */ "sd/c%db%dt%du%d", /* scsi/disc */ "sr/c%db%dt%du%d", /* scsi/cd */ "sd/c%db%dt%du%dp%d", /* scsi/part */ "st/c%db%dt%du%dm%d%c", /* scsi/mt */ "ide/hd/c%db%dt%du%d", /* ide/host/disc */ "ide/cd/c%db%dt%du%d", /* ide/host/cd */ "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */ "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */ NULL }; /* 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: ptr = strrchr (info->devname, '/') + 1; i=scan_dev_name(info->devname, info->namelen, ptr); debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i); /* nothing found */ if(i==0 || i > 9) return; sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun); snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0)); dest_name = dest_buf; compat_name = compat_buf; /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */ if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 ) sprintf ( compat_buf, fmt[i], host, bus, target, lun); /* 4 == scsi/part 8 == ide/host/part */ if( i == 4 || i == 8) sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) ); /* 5 == scsi/mt */ if( i == 5) { rewind_ = info->devname[info->namelen - 1]; if (rewind_ != 'n') rewind_ = '\0'; mode=0; if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/) mode = ptr[2] - 107; /* 1 or 2 */ if(ptr[2] == 'a') mode = 3; sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_); } /* 9 == ide/host/mt */ if( i == 9 ) snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2); /* esac */ } /* switch (action) */ if(compat_name == NULL ) return; debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name); /* 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: ret = unlink (compat_name); if (ENABLE_DEBUG && ret) debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name); break; /*esac*/ } /* switch (action) */ } /* End Function action_compat */ static void restore(char *spath, struct stat source_stat, int rootlen) { char dpath[STRING_LENGTH]; struct stat dest_stat; debug_msg_logger(LOG_INFO, __FUNCTION__); dest_stat.st_mode = 0; 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) ) dir_operation(RESTORE, spath, rootlen,NULL); } 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. <destpath> The destination path. An existing inode may be deleted. <dest_stat> The destination stat(2) information. <new_mode> The desired new mode for the destination. <sourcepath> The source path. <source_stat> The source stat(2) information. [RETURNS] TRUE on success, else FALSE. */ { int source_len, dest_len; char source_link[STRING_LENGTH], dest_link[STRING_LENGTH]; int fd, val; struct sockaddr_un un_addr; char symlink_val[STRING_LENGTH]; debug_msg_logger(LOG_INFO, __FUNCTION__); if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) ) { /* Same type */ if ( S_ISLNK (source_stat->st_mode) ) { 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) { 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; goto do_chown; 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; goto do_chown; case S_IFBLK: case S_IFCHR: case S_IFIFO: if (mknod (destpath, new_mode, source_stat->st_rdev) != 0) break; goto do_chown; case S_IFDIR: if (mkdir (destpath, new_mode & ~S_IFMT) != 0) break; do_chown: if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) return TRUE; /*break;*/ } return FALSE; } /* End Function copy_inode */ static void free_config (void) /* [SUMMARY] Free the configuration information. [RETURNS] Nothing. */ { struct config_entry_struct *c_entry; void *next; debug_msg_logger(LOG_INFO, __FUNCTION__); 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. <flag> "UID" or "GID". <string> The string. [RETURNS] The UID or GID value. */ { struct passwd *pw_ent; struct group *grp_ent; static const char *msg; if (ENABLE_DEVFSD_VERBOSE) msg="user"; debug_msg_logger(LOG_INFO, __FUNCTION__); if(ENABLE_DEBUG && flag != UID && flag != GID) msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__); 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 if(ENABLE_DEVFSD_VERBOSE) msg="group"; if(ENABLE_DEVFSD_VERBOSE) msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]); return 0; }/* End Function get_uid_gid */ static mode_t get_mode (const char *string) /* [SUMMARY] Convert a string to a mode value. <string> The string. [RETURNS] The mode value. */ { mode_t mode; int i; debug_msg_logger(LOG_INFO, __FUNCTION__); if ( isdigit (string[0]) ) return strtoul(string, NULL, 8); if (strlen (string) != 9) msg_logger_and_die(LOG_ERR, "bad mode: %s", string); mode = 0; i= S_IRUSR; while (i>0) { if(string[0]=='r'||string[0]=='w'||string[0]=='x') mode+=i; i=i/2; string++; } return mode; } /* End Function get_mode */ static void signal_handler (int sig) { debug_msg_logger(LOG_INFO, __FUNCTION__); caught_signal = TRUE; if (sig == SIGHUP) caught_sighup = TRUE; msg_logger(LOG_INFO, "Caught signal %d", sig); } /* 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]; const char *field_names[] = { "hostname", "mntpt", "devpath", "devname", "uid", "gid", "mode", hostname, mount_point, gv_info->devpath, gv_info->devname, 0 }; int i; debug_msg_logger(LOG_INFO, __FUNCTION__); if (gethostname (hostname, STRING_LENGTH - 1) != 0) msg_logger_and_die(LOG_ERR, "gethostname: %m"); /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */ hostname[STRING_LENGTH - 1] = '\0'; /* index_in_str_array returns i>=0 */ i=index_in_str_array(field_names, variable); if ( i > 6 || i < 0 || (i > 1 && gv_info == NULL)) return NULL; if( i >= 0 && i <= 3) { debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]); return field_names[i+7]; } if(i == 4 ) sprintf (sbuf, "%u", gv_info->info->uid); else if(i == 5) sprintf (sbuf, "%u", gv_info->info->gid); else if(i == 6) sprintf (sbuf, "%o", gv_info->info->mode); debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf); return sbuf; } /* End Function get_variable */ static void service(struct stat statbuf, char *path) { struct devfsd_notify_struct info; debug_msg_logger(LOG_INFO, __FUNCTION__); 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) ) dir_operation(SERVICE,path,0,NULL); } static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask) /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes. <flag> To choose which function to perform <dp> The directory pointer. This is closed upon completion. <dir_name> The name of the directory. <rootlen> string length parameter. [RETURNS] Nothing. */ { struct stat statbuf; DIR *dp; struct dirent *de; char path[STRING_LENGTH]; debug_msg_logger(LOG_INFO, __FUNCTION__); if((dp = opendir( dir_name))==NULL) { debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name); return; } while ( (de = readdir (dp) ) != NULL ) { if(de->d_name && DOT_OR_DOTDOT(de->d_name)) continue; snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name); debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path); if (lstat (path, &statbuf) != 0) { debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path); continue; } switch (type) { case SERVICE: service(statbuf,path); break; case RESTORE: restore(path, statbuf, var); break; case READ_CONFIG: read_config_file (path, var, event_mask); break; } } 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. <oldpath> The string contained in the symlink. <newpath> The name of the new symlink. [RETURNS] 0 on success, else -1. */ { debug_msg_logger(LOG_INFO, __FUNCTION__); if ( !make_dir_tree (newpath) ) return -1; if (symlink (oldpath, newpath) != 0) { if (errno != EEXIST) { debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath); return -1; } } return 0; } /* End Function mksymlink */ static int make_dir_tree (const char *path) /* [SUMMARY] Creating intervening directories for a path as required. <path> The full pathname (including the leaf node). [RETURNS] TRUE on success, else FALSE. */ { debug_msg_logger(LOG_INFO, __FUNCTION__); if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1) { debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path); 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 environment variables and regular subexpressions in string. <output> The output expanded expression is written here. <length> The size of the output buffer. <input> The input expression. This may equal <<output>>. <get_variable> 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. <info> An arbitrary pointer passed to <<get_variable>>. <devname> Device name; specifically, this is the string that contains all of the regular subexpressions. <ex> Array of start / end offsets into info->devname for each subexpression <numexp> Number of regular subexpressions found in <<devname>>. [RETURNS] TRUE on success, else FALSE. */ { char temp[STRING_LENGTH]; debug_msg_logger(LOG_INFO, __FUNCTION__); 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. <output> The output expanded expression is written here. <outsize> The size of the output buffer. <input> The input expression. This may NOT equal <<output>>, 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. <devname> Device name; specifically, this is the string that contains all of the regular subexpressions. <ex> An array of start and end offsets into <<devname>>, one for each subexpression <numex> Number of subexpressions in the offset-array <<ex>>. [RETURNS] Nothing. */ { const char last_exp = '0' - 1 + numex; int c = -1; debug_msg_logger(LOG_INFO, __FUNCTION__); /* 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 { const char *match; /* The string to match to (up to length) */ const 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. <devname> The device name provided by the kernel. <namelen> The length of the name. <buffer> A buffer that may be used. This should be at least 128 bytes long. <major> The major number for the device. <minor> 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; unsigned int i; char mode; int indexx; const char *pty1; const char *pty2; size_t len; /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */ static const char *const fmt[] = { NULL , "sg%u", /* scsi/generic */ NULL, /* scsi/disc */ "sr%u", /* scsi/cd */ NULL, /* scsi/part */ "nst%u%c", /* scsi/mt */ "hd%c" , /* ide/host/disc */ "hd%c" , /* ide/host/cd */ "hd%c%s", /* ide/host/part */ "%sht%d", /* ide/host/mt */ "sbpcd%u", /* sbp/ */ "vcs%s", /* vcc/ */ "%cty%c%c", /* pty/ */ NULL }; debug_msg_logger(LOG_INFO, __FUNCTION__); for (trans = translate_table; trans->match != NULL; ++trans) { 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; } } ptr = (strrchr (devname, '/') + 1); i = scan_dev_name(devname, namelen, ptr); if( i > 0 && i < 13) compat_name = buffer; else return NULL; debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i); /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */ if( i == 1 || i == 3 || i == 10 ) sprintf (buffer, fmt[i], minor); /* 2 ==scsi/disc, 4 == scsi/part */ if( i == 2 || i == 4) compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4))); /* 5 == scsi/mt */ if( i == 5) { mode = ptr[2]; if (mode == 'n') mode = '\0'; sprintf (buffer, fmt[i], minor & 0x1f, mode); if (devname[namelen - 1] != 'n') ++compat_name; } /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */ if( i == 6 || i == 7 || i == 8 ) /* last arg should be ignored for i == 6 or i== 7 */ sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4); /* 9 == ide/host/mt */ if( i == 9 ) sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f); /* 11 == vcc/ */ if( i == 11 ) { sprintf (buffer, fmt[i], devname + 4); if (buffer[3] == '0') buffer[3] = '\0'; } /* 12 == pty/ */ if( i == 12 ) { pty1 = "pqrstuvwxyzabcde"; pty2 = "0123456789abcdef"; indexx = atoi (devname + 5); sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]); } if(ENABLE_DEBUG && compat_name!=NULL) msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name); 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. <major> The major number for the device. <minor> The minor number for the device. [RETURNS] The drive letter. */ { char letter='y'; /* 121 */ char c='a'; /* 97 */ int i=IDE0_MAJOR; debug_msg_logger(LOG_INFO, __FUNCTION__); /* 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((unsigned int)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, const char *part) /* [SUMMARY] Write the old SCSI disc name to a buffer. <buffer> The buffer to write to. <major> The major number for the device. <minor> The minor number for the device. <part> The partition string. Must be "" for a whole-disc entry. [RETURNS] A pointer to the buffer on success, else NULL. */ { unsigned int disc_index; debug_msg_logger(LOG_INFO, __FUNCTION__); 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. <output> The output expanded expression is written here. <length> The size of the output buffer. <input> The input expression. This may equal <<output>>. <get_variable> 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. <info> An arbitrary pointer passed to <<get_variable>>. [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]; debug_msg_logger(LOG_INFO, __FUNCTION__); 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 ) { msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME"); 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 ) { msg_logger(LOG_INFO, "no pwent for: %s", tmp); 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: msg_logger(LOG_INFO, bb_msg_small_buffer); 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. <buffer> The buffer to write to. <length> The length of the output buffer. <out_pos> The current output position. This is updated. <input> A pointer to the input character pointer. <func> 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. <info> An arbitrary pointer passed to <<func>>. <errfp> 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]; debug_msg_logger(LOG_INFO, __FUNCTION__); 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 ((size_t)len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); input = ptr - 1; if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL ) { msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp); 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 "${var}" */ len = ptr - input; if ((size_t)len >= sizeof tmp) goto expand_variable_out; safe_memcpy (tmp, input, len); ptr = expand_variable (buffer, length, out_pos, tmp, func, info ); if (ptr == NULL) return NULL; return input + len; } if (ch != ':' || ptr[1] != '-' ) { msg_logger(LOG_INFO, "illegal char in var name"); return NULL; } /* It's that handy "${var:-word}" expression. Check if var is defined */ len = ptr - input; if ((size_t)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': msg_logger(LOG_INFO,"\"}\" not found in: %s", input); 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 ((size_t)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: msg_logger(LOG_INFO, bb_msg_small_buffer); 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 . <variable> The variable name. <func> 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; debug_msg_logger(LOG_INFO, __FUNCTION__); if (func != NULL) { value = (*func) (variable, info); if (value != NULL) return value; } return getenv(variable); } /* End Function get_variable */ /* END OF CODE */