| /* vi: set sw=4 ts=4: */ |
| /* |
| * Modprobe written from scratch for BusyBox |
| * |
| * Copyright (c) 2002 by Robert Griebl, griebl@gmx.de |
| * Copyright (c) 2003 by Andrew Dennison, andrew.dennison@motec.com.au |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <sys/utsname.h> |
| #include <getopt.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <syslog.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <fcntl.h> |
| #include "busybox.h" |
| |
| |
| |
| struct dep_t { |
| char * m_module; |
| char * m_options; |
| |
| int m_isalias : 1; |
| int m_reserved : 15; |
| |
| int m_depcnt : 16; |
| char ** m_deparr; |
| |
| struct dep_t * m_next; |
| }; |
| |
| struct mod_list_t { |
| char * m_module; |
| char * m_options; |
| |
| struct mod_list_t * m_prev; |
| struct mod_list_t * m_next; |
| }; |
| |
| |
| static struct dep_t *depend; |
| static int autoclean, show_only, quiet, do_syslog, verbose; |
| |
| int parse_tag_value ( char *buffer, char **ptag, char **pvalue ) |
| { |
| char *tag, *value; |
| |
| while ( isspace ( *buffer )) |
| buffer++; |
| tag = value = buffer; |
| while ( !isspace ( *value )) |
| value++; |
| *value++ = 0; |
| while ( isspace ( *value )) |
| value++; |
| |
| *ptag = tag; |
| *pvalue = value; |
| |
| return bb_strlen( tag ) && bb_strlen( value ); |
| } |
| |
| /* Jump through hoops to simulate how fgets() grabs just one line at a |
| * time... Don't use any stdio since modprobe gets called from a kernel |
| * thread and stdio junk can overflow the limited stack... |
| */ |
| static char *reads ( int fd, char *buffer, size_t len ) |
| { |
| int n = read ( fd, buffer, len ); |
| |
| if ( n > 0 ) { |
| char *p; |
| |
| buffer [len-1] = 0; |
| p = strchr ( buffer, '\n' ); |
| |
| if ( p ) { |
| off_t offset; |
| |
| offset = lseek ( fd, 0L, SEEK_CUR ); // Get the current file descriptor offset |
| lseek ( fd, offset-n + (p-buffer) + 1, SEEK_SET ); // Set the file descriptor offset to right after the \n |
| |
| p[1] = 0; |
| } |
| return buffer; |
| } |
| |
| else |
| return 0; |
| } |
| |
| static struct dep_t *build_dep ( void ) |
| { |
| int fd; |
| struct utsname un; |
| struct dep_t *first = 0; |
| struct dep_t *current = 0; |
| char buffer[256]; |
| char *filename = buffer; |
| int continuation_line = 0; |
| |
| if ( uname ( &un )) |
| return 0; |
| |
| // check for buffer overflow in following code |
| if ( bb_strlen ( un.release ) > ( sizeof( buffer ) - 64 )) { |
| return 0; |
| } |
| |
| strcpy ( filename, "/lib/modules/" ); |
| strcat ( filename, un.release ); |
| strcat ( filename, "/modules.dep" ); |
| |
| if (( fd = open ( filename, O_RDONLY )) < 0 ) { |
| |
| /* Ok, that didn't work. Fall back to looking in /lib/modules */ |
| if (( fd = open ( "/lib/modules/modules.dep", O_RDONLY )) < 0 ) { |
| return 0; |
| } |
| } |
| |
| while ( reads ( fd, buffer, sizeof( buffer ))) { |
| int l = bb_strlen ( buffer ); |
| char *p = 0; |
| |
| while ( isspace ( buffer [l-1] )) { |
| buffer [l-1] = 0; |
| l--; |
| } |
| |
| if ( l == 0 ) { |
| continuation_line = 0; |
| continue; |
| } |
| |
| if ( !continuation_line ) { |
| char *col = strchr ( buffer, ':' ); |
| |
| if ( col ) { |
| char *mods; |
| char *mod; |
| int ext = 0; |
| |
| *col = 0; |
| mods = strrchr ( buffer, '/' ); |
| |
| if ( !mods ) |
| mods = buffer; |
| else |
| mods++; |
| |
| if (( *(col-2) == '.' ) && ( *(col-1) == 'o' )) |
| ext = 2; |
| |
| mod = bb_xstrndup ( mods, col - mods - ext ); |
| |
| if ( !current ) { |
| first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t )); |
| } |
| else { |
| current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t )); |
| current = current-> m_next; |
| } |
| current-> m_module = mod; |
| current-> m_options = 0; |
| current-> m_isalias = 0; |
| current-> m_depcnt = 0; |
| current-> m_deparr = 0; |
| current-> m_next = 0; |
| |
| //printf ( "%s:\n", mod ); |
| |
| p = col + 1; |
| } |
| else |
| p = 0; |
| } |
| else |
| p = buffer; |
| |
| if ( p && *p ) { |
| char *end = &buffer [l-1]; |
| char *deps = strrchr ( end, '/' ); |
| char *dep; |
| int ext = 0; |
| |
| while ( isblank ( *end ) || ( *end == '\\' )) |
| end--; |
| |
| deps = strrchr ( p, '/' ); |
| |
| if ( !deps || ( deps < p )) { |
| deps = p; |
| |
| while ( isblank ( *deps )) |
| deps++; |
| } |
| else |
| deps++; |
| |
| if (( *(end-1) == '.' ) && ( *end == 'o' )) |
| ext = 2; |
| |
| /* Cope with blank lines */ |
| if ((end-deps-ext+1) <= 0) |
| continue; |
| |
| dep = bb_xstrndup ( deps, end - deps - ext + 1 ); |
| |
| current-> m_depcnt++; |
| current-> m_deparr = (char **) xrealloc ( current-> m_deparr, sizeof ( char *) * current-> m_depcnt ); |
| current-> m_deparr [current-> m_depcnt - 1] = dep; |
| |
| //printf ( " %d) %s\n", current-> m_depcnt, current-> m_deparr [current-> m_depcnt -1] ); |
| } |
| |
| if ( buffer [l-1] == '\\' ) |
| continuation_line = 1; |
| else |
| continuation_line = 0; |
| } |
| close ( fd ); |
| |
| // alias parsing is not 100% correct (no correct handling of continuation lines within an alias) ! |
| |
| if (( fd = open ( "/etc/modules.conf", O_RDONLY )) < 0 ) |
| if (( fd = open ( "/etc/conf.modules", O_RDONLY )) < 0 ) |
| return first; |
| |
| continuation_line = 0; |
| while ( reads ( fd, buffer, sizeof( buffer ))) { |
| int l; |
| char *p; |
| |
| p = strchr ( buffer, '#' ); |
| if ( p ) |
| *p = 0; |
| |
| l = bb_strlen ( buffer ); |
| |
| while ( l && isspace ( buffer [l-1] )) { |
| buffer [l-1] = 0; |
| l--; |
| } |
| |
| if ( l == 0 ) { |
| continuation_line = 0; |
| continue; |
| } |
| |
| if ( !continuation_line ) { |
| if (( strncmp ( buffer, "alias", 5 ) == 0 ) && isspace ( buffer [5] )) { |
| char *alias, *mod; |
| |
| if ( parse_tag_value ( buffer + 6, &alias, &mod )) { |
| // fprintf ( stderr, "ALIAS: '%s' -> '%s'\n", alias, mod ); |
| |
| if ( !current ) { |
| first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t )); |
| } |
| else { |
| current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t )); |
| current = current-> m_next; |
| } |
| current-> m_module = bb_xstrdup ( alias ); |
| current-> m_isalias = 1; |
| |
| if (( strcmp ( alias, "off" ) == 0 ) || ( strcmp ( alias, "null" ) == 0 )) { |
| current-> m_depcnt = 0; |
| current-> m_deparr = 0; |
| } |
| else { |
| current-> m_depcnt = 1; |
| current-> m_deparr = xmalloc ( 1 * sizeof( char * )); |
| current-> m_deparr[0] = bb_xstrdup ( mod ); |
| } |
| current-> m_next = 0; |
| } |
| } |
| else if (( strncmp ( buffer, "options", 7 ) == 0 ) && isspace ( buffer [7] )) { |
| char *mod, *opt; |
| |
| if ( parse_tag_value ( buffer + 8, &mod, &opt )) { |
| struct dep_t *dt; |
| |
| for ( dt = first; dt; dt = dt-> m_next ) { |
| if ( strcmp ( dt-> m_module, mod ) == 0 ) |
| break; |
| } |
| if ( dt ) { |
| dt-> m_options = xrealloc ( dt-> m_options, bb_strlen( opt ) + 1 ); |
| strcpy ( dt-> m_options, opt ); |
| |
| // fprintf ( stderr, "OPTION: '%s' -> '%s'\n", dt-> m_module, dt-> m_options ); |
| } |
| } |
| } |
| } |
| } |
| close ( fd ); |
| |
| return first; |
| } |
| |
| |
| static int mod_process ( struct mod_list_t *list, int do_insert ) |
| { |
| char lcmd [256]; |
| int rc = 1; |
| |
| while ( list ) { |
| if ( do_insert ) |
| snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s %s 2>/dev/null", do_syslog ? "-s" : "", autoclean ? "-k" : "", quiet ? "-q" : "", list-> m_module, list-> m_options ? list-> m_options : "" ); |
| else |
| snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s 2>/dev/null", do_syslog ? "-s" : "", list-> m_module ); |
| |
| if ( verbose ) |
| printf ( "%s\n", lcmd ); |
| if ( !show_only ) { |
| int rc2 = system ( lcmd ); |
| if (do_insert) rc = rc2; /* only last module matters */ |
| else if (!rc2) rc = 0; /* success if remove any mod */ |
| } |
| |
| list = do_insert ? list-> m_prev : list-> m_next; |
| } |
| return (show_only) ? 0 : rc; |
| } |
| |
| static void check_dep ( char *mod, struct mod_list_t **head, struct mod_list_t **tail ) |
| { |
| struct mod_list_t *find; |
| struct dep_t *dt; |
| char *opt = 0; |
| int lm; |
| |
| // remove .o extension |
| lm = bb_strlen ( mod ); |
| if (( mod [lm-2] == '.' ) && ( mod [lm-1] == 'o' )) |
| mod [lm-2] = 0; |
| |
| // check dependencies |
| for ( dt = depend; dt; dt = dt-> m_next ) { |
| if ( strcmp ( dt-> m_module, mod ) == 0 ) { |
| opt = dt-> m_options; |
| break; |
| } |
| } |
| |
| // resolve alias names |
| while ( dt && dt-> m_isalias ) { |
| if ( dt-> m_depcnt == 1 ) { |
| struct dep_t *adt; |
| |
| for ( adt = depend; adt; adt = adt-> m_next ) { |
| if ( strcmp ( adt-> m_module, dt-> m_deparr [0] ) == 0 ) |
| break; |
| } |
| if ( adt ) { |
| dt = adt; |
| mod = dt-> m_module; |
| if ( !opt ) |
| opt = dt-> m_options; |
| } |
| else |
| return; |
| } |
| else |
| return; |
| } |
| |
| // search for duplicates |
| for ( find = *head; find; find = find-> m_next ) { |
| if ( !strcmp ( mod, find-> m_module )) { |
| // found -> dequeue it |
| |
| if ( find-> m_prev ) |
| find-> m_prev-> m_next = find-> m_next; |
| else |
| *head = find-> m_next; |
| |
| if ( find-> m_next ) |
| find-> m_next-> m_prev = find-> m_prev; |
| else |
| *tail = find-> m_prev; |
| |
| break; // there can be only one duplicate |
| } |
| } |
| |
| if ( !find ) { // did not find a duplicate |
| find = (struct mod_list_t *) xmalloc ( sizeof(struct mod_list_t)); |
| find-> m_module = mod; |
| find-> m_options = opt; |
| } |
| |
| // enqueue at tail |
| if ( *tail ) |
| (*tail)-> m_next = find; |
| find-> m_prev = *tail; |
| find-> m_next = 0; |
| |
| if ( !*head ) |
| *head = find; |
| *tail = find; |
| |
| if ( dt ) { |
| int i; |
| |
| for ( i = 0; i < dt-> m_depcnt; i++ ) |
| check_dep ( dt-> m_deparr [i], head, tail ); |
| } |
| } |
| |
| |
| |
| static int mod_insert ( char *mod, int argc, char **argv ) |
| { |
| struct mod_list_t *tail = 0; |
| struct mod_list_t *head = 0; |
| int rc; |
| |
| // get dep list for module mod |
| check_dep ( mod, &head, &tail ); |
| |
| if ( head && tail ) { |
| if ( argc ) { |
| int i; |
| int l = 0; |
| |
| // append module args |
| for ( i = 0; i < argc; i++ ) |
| l += ( bb_strlen ( argv [i] ) + 1 ); |
| |
| head-> m_options = xrealloc ( head-> m_options, l + 1 ); |
| head-> m_options [0] = 0; |
| |
| for ( i = 0; i < argc; i++ ) { |
| strcat ( head-> m_options, argv [i] ); |
| strcat ( head-> m_options, " " ); |
| } |
| } |
| |
| // process tail ---> head |
| rc = mod_process ( tail, 1 ); |
| } |
| else |
| rc = 1; |
| |
| return rc; |
| } |
| |
| static int mod_remove ( char *mod ) |
| { |
| int rc; |
| static struct mod_list_t rm_a_dummy = { "-a", 0, 0 }; |
| |
| struct mod_list_t *head = 0; |
| struct mod_list_t *tail = 0; |
| |
| if ( mod ) |
| check_dep ( mod, &head, &tail ); |
| else // autoclean |
| head = tail = &rm_a_dummy; |
| |
| if ( head && tail ) |
| rc = mod_process ( head, 0 ); // process head ---> tail |
| else |
| rc = 1; |
| return rc; |
| |
| } |
| |
| |
| |
| extern int modprobe_main(int argc, char** argv) |
| { |
| int opt; |
| int remove_opt = 0; |
| |
| autoclean = show_only = quiet = do_syslog = verbose = 0; |
| |
| while ((opt = getopt(argc, argv, "acdklnqrst:vVC:")) != -1) { |
| switch(opt) { |
| case 'c': // no config used |
| case 'l': // no pattern matching |
| return EXIT_SUCCESS; |
| break; |
| case 'C': // no config used |
| case 't': // no pattern matching |
| bb_error_msg_and_die("-t and -C not supported"); |
| |
| case 'a': // ignore |
| case 'd': // ignore |
| break; |
| case 'k': |
| autoclean++; |
| break; |
| case 'n': |
| show_only++; |
| break; |
| case 'q': |
| quiet++; |
| break; |
| case 'r': |
| remove_opt++; |
| break; |
| case 's': |
| do_syslog++; |
| break; |
| case 'v': |
| verbose++; |
| break; |
| case 'V': |
| default: |
| bb_show_usage(); |
| break; |
| } |
| } |
| |
| depend = build_dep ( ); |
| |
| if ( !depend ) |
| bb_error_msg_and_die ( "could not parse modules.dep\n" ); |
| |
| if (remove_opt) { |
| int rc = EXIT_SUCCESS; |
| do { |
| if (mod_remove ( optind < argc ? |
| bb_xstrdup (argv [optind]) : NULL )) { |
| bb_error_msg ("failed to remove module %s", |
| argv [optind] ); |
| rc = EXIT_FAILURE; |
| } |
| } while ( ++optind < argc ); |
| |
| return rc; |
| } |
| |
| if (optind >= argc) |
| bb_error_msg_and_die ( "No module or pattern provided\n" ); |
| |
| if ( mod_insert ( bb_xstrdup ( argv [optind] ), argc - optind - 1, argv + optind + 1 )) |
| bb_error_msg_and_die ( "failed to load module %s", argv [optind] ); |
| |
| return EXIT_SUCCESS; |
| } |
| |
| |