diff options
Diffstat (limited to 'release/src/router/busybox/miscutils/devfsd.c')
| -rw-r--r-- | release/src/router/busybox/miscutils/devfsd.c | 1801 |
1 files changed, 1801 insertions, 0 deletions
diff --git a/release/src/router/busybox/miscutils/devfsd.c b/release/src/router/busybox/miscutils/devfsd.c new file mode 100644 index 00000000..61b97dce --- /dev/null +++ b/release/src/router/busybox/miscutils/devfsd.c @@ -0,0 +1,1801 @@ +/* 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 "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; + + wait4pid(xspawn(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; + wait4pid(spawn(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 */ |