/* 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
+ *
+ * Copyright (c) 2002 by Robert Griebl, griebl@gmx.de
+ * Copyright (c) 2003 by Andrew Dennison, andrew.dennison@motec.com.au
+ * Copyright (c) 2005 by Jim Bauer, jfbauer@nfr.com
+ *
+ * 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 <stdio.h>
+#include <sys/utsname.h>
+#include <sys/types.h>
+#include <sys/wait.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"
-static char cmd[128];
-extern int modprobe_main(int argc, char** argv)
+
+struct dep_t {
+ char * m_name;
+ char * m_path;
+ 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_name;
+ char * m_path;
+ 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;
+static int k_version;
+
+static int parse_tag_value ( char *buffer, char **ptag, char **pvalue )
{
- int ch, rc = 0;
- int loadall = 0, showconfig = 0, debug = 0, autoclean = 0, list = 0;
- int show_only = 0, quiet = 0, remove_opt = 0, do_syslog = 0, verbose = 0;
- char *load_type = NULL, *config = NULL;
-
- while ((ch = getopt(argc, argv, "acdklnqrst:vVC:")) != -1)
- switch(ch) {
- case 'a':
- loadall++;
- break;
- case 'c':
- showconfig++;
- break;
- case 'd':
- debug++;
- break;
- case 'k':
- autoclean++;
- break;
- case 'l':
- list++;
- break;
- case 'n':
- show_only++;
- break;
- case 'q':
- quiet++;
- break;
- case 'r':
- remove_opt++;
- break;
- case 's':
- do_syslog++;
- break;
- case 't':
- load_type = optarg;
- break;
- case 'v':
- verbose++;
- break;
- case 'C':
- config = optarg;
- break;
- case 'V':
- default:
- show_usage();
+ char *tag, *value;
+
+ while ( isspace ( *buffer ))
+ buffer++;
+ tag = value = buffer;
+ while ( !isspace ( *value ))
+ if (!*value) return 0;
+ else value++;
+ *value++ = 0;
+ while ( isspace ( *value ))
+ value++;
+ if (!*value) return 0;
+
+ *ptag = tag;
+ *pvalue = value;
+
+ return 1;
+}
+
+/* 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[2048];
+ char *filename = buffer;
+ int continuation_line = 0;
+
+ k_version = 0;
+ if ( uname ( &un ))
+ return 0;
+
+ // check for buffer overflow in following code
+ if ( bb_strlen ( un.release ) > ( sizeof( buffer ) - 64 )) {
+ return 0;
+ }
+ if (un.release[0] == '2') {
+ k_version = un.release[2] - '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, ':' );
+ char *dot = col;
+
+ if ( col ) {
+ char *mods;
+ char *modpath;
+ char *mod;
+
+ *col = 0;
+ mods = strrchr ( buffer, '/' );
+
+ if ( !mods )
+ mods = buffer;
+ else
+ mods++;
+
+ modpath = strchr ( buffer, '/' );
+ if ( !modpath )
+ modpath = buffer;
+#if defined(CONFIG_FEATURE_2_6_MODULES)
+ if ((k_version > 4) && ( *(col-3) == '.' ) &&
+ ( *(col-2) == 'k' ) && ( *(col-1) == 'o' ))
+ dot = col - 3;
+ else
+#endif
+ if (( *(col-2) == '.' ) && ( *(col-1) == 'o' ))
+ dot = col - 2;
+
+ mod = bb_xstrndup ( mods, dot - mods );
+
+ 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_name = mod;
+ current-> m_path = bb_xstrdup(modpath);
+ 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;
+
+ while ( p && *p && isblank(*p))
+ p++;
+
+ if ( p && *p ) {
+ char *end = &buffer [l-1];
+ char *deps;
+ char *dep;
+ char *next;
+ int ext = 0;
+
+ while ( isblank ( *end ) || ( *end == '\\' ))
+ end--;
+
+ do
+ {
+ next = strchr (p, ' ' );
+ if (next)
+ {
+ *next = 0;
+ next--;
+ }
+ else
+ next = end;
+
+ deps = strrchr ( p, '/' );
+
+ if ( !deps || ( deps < p )) {
+ deps = p;
+
+ while ( isblank ( *deps ))
+ deps++;
+ }
+ else
+ deps++;
+
+#if defined(CONFIG_FEATURE_2_6_MODULES)
+ if ((k_version > 4) && ( *(next-2) == '.' ) && *(next-1) == 'k' &&
+ ( *next == 'o' ))
+ ext = 3;
+ else
+#endif
+ if (( *(next-1) == '.' ) && ( *next == 'o' ))
+ ext = 2;
+
+ /* Cope with blank lines */
+ if ((next-deps-ext+1) <= 0)
+ continue;
+ dep = bb_xstrndup ( deps, next - 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] );
+ p = next + 2;
+ } while (next < end);
+ }
+
+ 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 defined(CONFIG_FEATURE_2_6_MODULES)
+ if (( fd = open ( "/etc/modprobe.conf", O_RDONLY )) < 0 )
+#endif
+ 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 *) xcalloc ( 1, sizeof ( struct dep_t ));
+ }
+ else {
+ current-> m_next = (struct dep_t *) xcalloc ( 1, sizeof ( struct dep_t ));
+ current = current-> m_next;
+ }
+ current-> m_name = bb_xstrdup ( alias );
+ current-> m_isalias = 1;
+
+ if (( strcmp ( mod, "off" ) == 0 ) || ( strcmp ( mod, "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_name, 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_name, dt-> m_options );
+ }
+ }
+ }
+ }
+ }
+ 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[4096];
+
+ 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 )
+{
+ int rc = 0;
+ char *argv[10];
+ int argc;
+
+ while ( list ) {
+ argc = 0;
+ if ( do_insert ) {
+ if (already_loaded (list->m_name) != 1) {
+ argv[argc++] = "insmod";
+ if (do_syslog)
+ argv[argc++] = "-s";
+ if (autoclean)
+ argv[argc++] = "-k";
+ if (quiet)
+ argv[argc++] = "-q";
+ argv[argc++] = list-> m_path;
+ if (list-> m_options)
+ argv[argc++] = list-> m_options;
+ }
+ } else {
+ /* modutils uses short name for removal */
+ if (already_loaded (list->m_name) != 0) {
+ argv[argc++] = "rmmod";
+ if (do_syslog)
+ argv[argc++] = "-s";
+ argv[argc++] = list->m_name;
+ }
+ }
+ argv[argc] = NULL;
+
+ if (argc) {
+ if (verbose) {
+ int i;
+ for (i=0; i<argc; i++)
+ printf("%s ", argv[i]);
+ printf("\n");
+ }
+ if (!show_only) {
+ int rc2 = 0;
+ int status;
+ switch (fork()) {
+ case -1:
+ rc2 = 1;
+ break;
+ case 0: //child
+ execvp(argv[0], argv);
+ bb_perror_msg_and_die("exec of %s", argv[0]);
+ /* NOTREACHED */
+ default:
+ if (wait(&status) == -1) {
+ rc2 = 1;
+ break;
+ }
+ if (WIFEXITED(status))
+ rc2 = WEXITSTATUS(status);
+ if (WIFSIGNALED(status))
+ rc2 = WTERMSIG(status);
+ break;
+ }
+ 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;
+ char *path = 0;
+
+ // check dependencies
+ for ( dt = depend; dt; dt = dt-> m_next ) {
+ if ( strcmp ( dt-> m_name, mod ) == 0) {
+ mod = dt-> m_name;
+ path = dt-> m_path;
+ 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_name, dt-> m_deparr [0] ) == 0 )
+ break;
+ }
+ if ( adt ) {
+ dt = adt;
+ mod = dt-> m_name;
+ path = dt-> m_path;
+ if ( !opt )
+ opt = dt-> m_options;
+ }
+ else
+ return;
+ }
+ else
+ return;
+ }
- if (load_type || config) {
- fprintf(stderr, "-t and -C not supported\n");
- exit(EXIT_FAILURE);
+ if ( !path ) {
+ bb_error_msg ("module %s not found.", mod);
+ return;
}
- if (showconfig)
- exit(EXIT_SUCCESS);
-
- if (list)
- exit(EXIT_SUCCESS);
-
- if (remove_opt) {
- do {
- sprintf(cmd, "rmmod %s %s %s",
- optind >= argc ? "-a" : "",
- do_syslog ? "-s" : "",
- optind < argc ? argv[optind] : "");
- if (do_syslog)
- syslog(LOG_INFO, "%s", cmd);
- if (show_only || verbose)
- printf("%s\n", cmd);
- if (!show_only)
- rc = system(cmd);
- } while (++optind < argc);
- exit(EXIT_SUCCESS);
- }
-
- if (optind >= argc) {
- fprintf(stderr, "No module or pattern provided\n");
- exit(EXIT_FAILURE);
- }
-
- sprintf(cmd, "insmod %s %s %s",
- do_syslog ? "-s" : "",
- quiet ? "-q" : "",
- autoclean ? "-k" : "");
- while (optind < argc) {
- strcat(cmd, " ");
- strcat(cmd, argv[optind]);
- optind++;
- }
- if (do_syslog)
- syslog(LOG_INFO, "%s", cmd);
- if (show_only || verbose)
- printf("%s\n", cmd);
- if (!show_only)
- rc = system(cmd);
+ // search for duplicates
+ for ( find = *head; find; find = find-> m_next ) {
+ if ( !strcmp ( mod, find-> m_name )) {
+ // 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_name = mod;
+ find-> m_path = path;
+ 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 defined(CONFIG_FEATURE_2_6_MODULES)
+ 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, " " );
+ }
+ }
+#endif
+
+ // 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 = 0;
+ rc = 1;
+ return rc;
- exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
}
+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;
+}
projects / oweals / busybox.git / blobdiff