/* vi: set sw=4 ts=4: */ /* * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ /* 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. */ //usage:#define devfsd_trivial_usage //usage: "mntpnt [-v]" IF_DEVFSD_FG_NP("[-fg][-np]") //usage:#define devfsd_full_usage "\n\n" //usage: "Manage devfs permissions and old device name symlinks\n" //usage: "\n mntpnt The mount point where devfs is mounted" //usage: "\n -v Print the protocol version numbers for devfsd" //usage: "\n and the kernel-side protocol version and exit" //usage: IF_DEVFSD_FG_NP( //usage: "\n -fg Run in foreground" //usage: "\n -np Exit after parsing the configuration file" //usage: "\n and processing synthetic REGISTER events," //usage: "\n don't poll for events" //usage: ) #include "libbb.h" #include "xregex.h" #include <syslog.h> #include <sys/un.h> #include <sys/sysmacros.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 int get_uid_gid(int flag, const char *string); 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, const char *ptr); static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr); /* Structs and vars */ static struct config_entry_struct *first_config = NULL; static struct config_entry_struct *last_config = NULL; static 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 bb_msg_proto_rev[] ALIGN1 = "protocol revision"; static const char bb_msg_bad_config[] ALIGN1 = "bad %s config file: %s"; static const char bb_msg_small_buffer[] ALIGN1 = "buffer too small"; static const char bb_msg_variable_not_found[] ALIGN1 = "variable: %s not found"; /* Busybox stuff */ #if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG #define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args) #define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args) #define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args) #define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args) #define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args) #else #define info_logger(p, fmt, args...) #define msg_logger(p, fmt, args...) #define msg_logger_and_die(p, fmt, args...) exit(EXIT_FAILURE) #define error_logger(p, fmt, args...) #define error_logger_and_die(p, fmt, args...) exit(EXIT_FAILURE) #endif 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, const 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, const 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) MAIN_EXTERNALLY_VISIBLE; 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(); } } mount_point = bb_simplify_path(argv[1]); xchdir(mount_point); fd = xopen(".devfsd", O_RDONLY); close_on_exec_on(fd); xioctl(fd, DEVFSDIOC_GET_PROTO_REV, &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)) { 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) */ xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, 0); /* Set up SIGHUP and SIGUSR1 handlers */ sigemptyset(&new_action.sa_mask); new_action.sa_flags = 0; new_action.sa_handler = signal_handler; sigaction_set(SIGHUP, &new_action); sigaction_set(SIGUSR1, &new_action); 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(EXIT_SUCCESS); if (ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG) logmode = LOGMODE_BOTH; else if (do_daemon == TRUE) logmode = LOGMODE_SYSLOG; /* This is the default */ /*else logmode = LOGMODE_STDIO; */ if (do_daemon) { /* Release so that the child can grab it */ xioctl(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0); bb_daemonize_or_rexec(0, argv); } 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); } if (ENABLE_FEATURE_CLEAN_UP) free(mount_point); } /* 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; char *p; if (stat(path, &statbuf) == 0) { /* Don't read 0 length files: ignored */ /*if (statbuf.st_size == 0) return;*/ if (S_ISDIR(statbuf.st_mode)) { p = bb_simplify_path(path); dir_operation(READ_CONFIG, p, 0, event_mask); free(p); return; } fp = fopen_for_read(path); if (fp != NULL) { while (fgets(buf, STRING_LENGTH, fp) != NULL) { /* Skip whitespace */ line = buf; line = skip_whitespace(line); 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) error_logger_and_die(LOG_ERR, "read config file: %s", 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 options[] ALIGN1 = "CLEAR_CONFIG\0""INCLUDE\0""OPTIONAL_INCLUDE\0" "RESTORE\0""PERMISSIONS\0""MODLOAD\0""EXECUTE\0" "COPY\0""IGNORE\0""MKOLDCOMPAT\0""MKNEWCOMPAT\0" "RMOLDCOMPAT\0""RMNEWCOMPAT\0"; 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_strings(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); info_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 = xzalloc(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_strings(options, what); switch (i) { case 4: /* "PERMISSIONS" */ new->action.what = AC_PERMISSIONS; /* Get user and group */ ptr = strchr(p[0], '.'); if (ptr == 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; /* (void*) cast is only in order to match prototype */ xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, (void*)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; if (ENABLE_DEBUG && info->overrun_count > 0) 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 */; 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; 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 ) error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname); } /* End Function action_permissions */ static void action_modload(const struct devfsd_notify_struct *info, const struct config_entry_struct *entry UNUSED_PARAM) /* [SUMMARY] Load a module. <info> The devfs change. <entry> The config file entry. [RETURNS] Nothing. */ { char *argv[6]; 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] = concat_path_file("/dev", info->devname); /* device */ argv[5] = NULL; spawn_and_wait(argv); free(argv[4]); } /* 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]; 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; spawn_and_wait(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; 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)) error_logger(LOG_ERR, "copy_inode: %s to %s", 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; const char *ptr; 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 = bb_basename(info->devname); i = scan_dev_name(info->devname, info->namelen, ptr); /* 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; /* 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) error_logger(LOG_ERR, "unlink: %s", compat_name); break; /*esac*/ } /* switch (action) */ } /* End Function action_compat */ static void restore(char *spath, struct stat source_stat, int rootlen) { char *dpath; struct stat dest_stat; dest_stat.st_mode = 0; dpath = concat_path_file(mount_point, spath + rootlen); lstat(dpath, &dest_stat); free(dpath); 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]; if ((source_stat->st_mode & S_IFMT) ==(dest_stat->st_mode & S_IFMT)) { /* Same type */ if (S_ISLNK(source_stat->st_mode)) { source_len = readlink(sourcepath, source_link, STRING_LENGTH - 1); if ((source_len < 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: fd = socket(AF_UNIX, SOCK_STREAM, 0); if (fd < 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: val = readlink(sourcepath, symlink_val, STRING_LENGTH - 1); if (val < 0) break; symlink_val[val] = '\0'; if (symlink(symlink_val, destpath) == 0) return TRUE; break; case S_IFREG: fd = open(destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT); if (fd < 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; 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"; 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; 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) { caught_signal = TRUE; if (sig == SIGHUP) caught_sighup = TRUE; info_logger(LOG_INFO, "Caught signal %d", sig); } /* End Function signal_handler */ static const char *get_variable(const char *variable, void *info) { static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */ static char *hostname; struct get_variable_info *gv_info = info; const char *field_names[] = { "hostname", "mntpt", "devpath", "devname", "uid", "gid", "mode", hostname, mount_point, gv_info->devpath, gv_info->devname, NULL }; int i; if (!hostname) hostname = safe_gethostname(); /* 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) 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); return sbuf; } /* End Function get_variable */ static void service(struct stat statbuf, char *path) { struct devfsd_notify_struct info; 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; dp = warn_opendir(dir_name); if (dp == NULL) return; while ((de = readdir(dp)) != NULL) { if (de->d_name && DOT_OR_DOTDOT(de->d_name)) continue; path = concat_path_file(dir_name, de->d_name); if (lstat(path, &statbuf) == 0) { 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; } } free(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. <oldpath> The string contained in the symlink. <newpath> The name of the new symlink. [RETURNS] 0 on success, else -1. */ { if (!make_dir_tree(newpath)) return -1; if (symlink(oldpath, newpath) != 0) { if (errno != EEXIST) 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. */ { if (bb_make_directory(dirname((char *)path), -1, FILEUTILS_RECUR) == -1) 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]; 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; /* 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; const 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 }; 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 = bb_basename(devname); i = scan_dev_name(devname, namelen, ptr); if (i > 0 && i < 13) compat_name = buffer; else return NULL; /* 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]); } 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; /* 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; 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]; 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 */ env = getenv("HOME"); if (env == NULL) { info_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; pwent = getpwnam(tmp); if (pwent == NULL) { info_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: info_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]; 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; env = get_variable_v2(tmp, func, info); if (env == NULL) { info_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 "${var}" */ len = ptr - input; if ((size_t)len >= sizeof tmp) goto expand_variable_out; safe_memcpy(tmp, input, len); ptr = expand_variable(buffer, length, out_pos, tmp, func, info); if (ptr == NULL) return NULL; return input + len; } if (ch != ':' || ptr[1] != '-') { info_logger(LOG_INFO, "illegal char in var name"); return NULL; } /* It's that handy "${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': info_logger(LOG_INFO, "\"}\" not found in: %s", input); return NULL; default: break; } } --ptr; /* At this point ptr should point to closing brace of "${var:-word}" */ env = get_variable_v2(tmp, func, info); if (env != NULL) { /* Found environment variable, so skip the input to the closing brace and return the variable */ input = ptr; len = strlen(env); if (len + *out_pos >= length) goto expand_variable_out; memcpy(buffer + *out_pos, env, len + 1); *out_pos += len; return input; } /* Environment variable was not found, so process word. Advance input pointer to start of word in "${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: info_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; if (func != NULL) { value = (*func)(variable, info); if (value != NULL) return value; } return getenv(variable); } /* End Function get_variable */ /* END OF CODE */