/* vi: set sw=4 ts=4: */
/*
- * really dumb modprobe implementation for busybox
- * Copyright (C) 2001 Lineo, davidm@lineo.com
+ * Modprobe written from scratch for BusyBox
*
- * dependency specific stuff completly rewritten and
- * copyright (c) 2002 by Robert Griebl, griebl@gmx.de
+ * 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 <stdio.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;
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;
- FILE *f;
struct dep_t *first = 0;
struct dep_t *current = 0;
- char buffer [4096];
+ char buffer[256];
char *filename = buffer;
int continuation_line = 0;
return 0;
// check for buffer overflow in following code
- if ( xstrlen ( un. release ) > ( sizeof( buffer ) - 64 ))
+ if ( bb_strlen ( un.release ) > ( sizeof( buffer ) - 64 )) {
return 0;
+ }
strcpy ( filename, "/lib/modules/" );
- strcat ( filename, un. release );
+ strcat ( filename, un.release );
strcat ( filename, "/modules.dep" );
- f = fopen ( filename, "r" );
- if ( !f )
- return 0;
-
- while ( fgets ( buffer, sizeof( buffer), f )) {
- int l = xstrlen ( buffer );
+ 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] )) {
if (( *(col-2) == '.' ) && ( *(col-1) == 'o' ))
ext = 2;
- mod = xstrndup ( mods, col - mods - ext );
+ mod = bb_xstrndup ( mods, col - mods - ext );
if ( !current ) {
- first = current = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
+ first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
}
else {
- current-> m_next = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
+ 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;
if (( *(end-1) == '.' ) && ( *end == 'o' ))
ext = 2;
+
+ /* Cope with blank lines */
+ if ((end-deps-ext+1) <= 0)
+ continue;
- dep = xstrndup ( deps, end - deps - ext + 1 );
+ dep = bb_xstrndup ( deps, end - deps - ext + 1 );
current-> m_depcnt++;
current-> m_deparr = (char **) xrealloc ( current-> m_deparr, sizeof ( char *) * current-> m_depcnt );
else
continuation_line = 0;
}
- fclose ( f );
+ close ( fd );
// alias parsing is not 100% correct (no correct handling of continuation lines within an alias) !
- f = fopen ( "/etc/modules.conf", "r" );
- if ( !f )
- f = fopen ( "/etc/conf.modules", "r" );
- if ( f ) {
- continuation_line = 0;
+ if (( fd = open ( "/etc/modules.conf", O_RDONLY )) < 0 )
+ if (( fd = open ( "/etc/conf.modules", O_RDONLY )) < 0 )
+ return first;
- while ( fgets ( buffer, sizeof( buffer), f )) {
- int l;
- char *p;
-
- p = strchr ( buffer, '#' );
- if ( p )
- *p = 0;
-
- l = xstrlen ( buffer );
+ continuation_line = 0;
+ while ( reads ( fd, buffer, sizeof( buffer ))) {
+ int l;
+ char *p;
- while ( l && isspace ( buffer [l-1] )) {
- buffer [l-1] = 0;
- l--;
- }
+ p = strchr ( buffer, '#' );
+ if ( p )
+ *p = 0;
- if ( l == 0 ) {
- continuation_line = 0;
- continue;
- }
-
- if ( !continuation_line ) {
- if (( strncmp ( buffer, "alias", 5 ) == 0 ) && isspace ( buffer [5] )) {
- char *alias, *mod;
+ 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;
- alias = buffer + 6;
-
- while ( isspace ( *alias ))
- alias++;
- mod = alias;
- while ( !isspace ( *mod ))
- mod++;
- *mod = 0;
- mod++;
- while ( isspace ( *mod ))
- mod++;
-
-// fprintf ( stderr, "ALIAS: '%s' -> '%s'\n", 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 *) malloc ( sizeof ( struct dep_t ));
+ first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
}
else {
- current-> m_next = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
+ current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
current = current-> m_next;
}
- current-> m_module = xstrdup ( alias );
+ current-> m_module = bb_xstrdup ( alias );
current-> m_isalias = 1;
if (( strcmp ( alias, "off" ) == 0 ) || ( strcmp ( alias, "null" ) == 0 )) {
else {
current-> m_depcnt = 1;
current-> m_deparr = xmalloc ( 1 * sizeof( char * ));
- current-> m_deparr[0] = xstrdup ( mod );
+ 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 );
+ }
+ }
}
}
- fclose ( f );
}
+ close ( fd );
return first;
}
+/* return 1 = loaded, 0 = not loaded, -1 = can't tell */
+static int already_loaded (const char *name)
+{
+ int fd;
+ char buffer[256];
+
+ fd = open ("/proc/modules", O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ while ( reads ( fd, buffer, sizeof( buffer ))) {
+ char *p;
+
+ p = strchr (buffer, ' ');
+ if (p) {
+ *p = 0;
+ if (strcmp (name, buffer) == 0) {
+ close (fd);
+ return 1;
+ }
+ }
+ }
+
+ close (fd);
+ return 0;
+}
static int mod_process ( struct mod_list_t *list, int do_insert )
{
char lcmd [256];
- int rc = 0;
-
- if ( !list )
- return 1;
+ int rc = 1;
while ( list ) {
- if ( do_insert )
- snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s 2>/dev/null", do_syslog ? "-s" : "", autoclean ? "-k" : "", quiet ? "-q" : "", list-> m_module );
- else
- snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s 2>/dev/null", do_syslog ? "-s" : "", list-> m_module );
+ if ( do_insert ) {
+ if (already_loaded (list->m_module) != 1)
+ snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s %s", do_syslog ? "-s" : "", autoclean ? "-k" : "", quiet ? "-q" : "", list-> m_module, list-> m_options ? list-> m_options : "" );
+ } else {
+ if (already_loaded (list->m_module) != 0)
+ snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s", do_syslog ? "-s" : "", list-> m_module );
+ }
if ( verbose )
printf ( "%s\n", lcmd );
- if ( !show_only )
- rc |= system ( 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 rc;
+ 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 = xstrlen ( mod );
+ 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 )
+ if ( strcmp ( dt-> m_module, mod ) == 0 ) {
+ opt = dt-> m_options;
break;
+ }
}
+
// resolve alias names
- if ( dt && dt-> m_isalias ) {
- if ( dt-> m_depcnt == 1 )
- check_dep ( dt-> m_deparr [0], head, tail );
- printf ( "Got alias: %s -> %s\n", mod, dt-> m_deparr [0] );
-
- return;
+ 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
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
{
struct mod_list_t *tail = 0;
struct mod_list_t *head = 0;
- int rc = 0;
+ int rc;
// get dep list for module mod
check_dep ( mod, &head, &tail );
if ( head && tail ) {
- int i;
- int l = 0;
+ if ( argc ) {
+ int i;
+ int l = 0;
- // append module args
- l = xstrlen ( head-> m_module );
- for ( i = 0; i < argc; i++ )
- l += ( xstrlen ( argv [i] ) + 1 );
+ // append module args
+ for ( i = 0; i < argc; i++ )
+ l += ( bb_strlen ( argv [i] ) + 1 );
- head-> m_module = realloc ( head-> m_module, l + 1 );
+ head-> m_options = xrealloc ( head-> m_options, l + 1 );
+ head-> m_options [0] = 0;
- for ( i = 0; i < argc; i++ ) {
- strcat ( head-> m_module, " " );
- strcat ( head-> m_module, argv [i] );
+ for ( i = 0; i < argc; i++ ) {
+ strcat ( head-> m_options, argv [i] );
+ strcat ( head-> m_options, " " );
+ }
}
-
+
// process tail ---> head
- rc |= mod_process ( tail, 1 );
+ rc = mod_process ( tail, 1 );
}
else
rc = 1;
return rc;
}
-static void mod_remove ( char *mod )
+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;
head = tail = &rm_a_dummy;
if ( head && tail )
- mod_process ( head, 0 ); // process head ---> tail
+ rc = mod_process ( head, 0 ); // process head ---> tail
+ else
+ rc = 1;
+ return rc;
+
}
break;
case 'C': // no config used
case 't': // no pattern matching
- error_msg_and_die("-t and -C not supported");
+ bb_error_msg_and_die("-t and -C not supported");
case 'a': // ignore
case 'd': // ignore
break;
case 'V':
default:
- show_usage();
+ bb_show_usage();
break;
}
}
depend = build_dep ( );
if ( !depend )
- error_msg_and_die ( "could not parse modules.dep\n" );
+ bb_error_msg_and_die ( "could not parse modules.dep\n" );
if (remove_opt) {
+ int rc = EXIT_SUCCESS;
do {
- mod_remove ( optind < argc ? argv [optind] : 0 );
+ 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 EXIT_SUCCESS;
+ return rc;
}
if (optind >= argc)
- error_msg_and_die ( "No module or pattern provided\n" );
+ 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 mod_insert ( argv [optind], argc - optind - 1, argv + optind + 1 ) ? \
- EXIT_FAILURE : EXIT_SUCCESS;
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff