370 lines
7.1 KiB
C
370 lines
7.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* really dumb modprobe implementation for busybox
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* Copyright (C) 2001 Lineo, davidm@lineo.com
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*
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* dependency specific stuff completly rewritten and
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* copyright (c) 2002 by Robert Griebl, griebl@gmx.de
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*
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*/
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#include <sys/utsname.h>
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#include <stdio.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <string.h>
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#include <ctype.h>
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#include "busybox.h"
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struct dep_t {
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char * m_module;
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int m_depcnt;
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char ** m_deparr;
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struct dep_t * m_next;
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};
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struct mod_list_t {
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char * m_module;
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struct mod_list_t * m_prev;
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struct mod_list_t * m_next;
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};
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static struct dep_t *depend;
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static int autoclean, show_only, quiet, do_syslog, verbose;
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static struct dep_t *build_dep ( void )
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{
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struct utsname un;
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FILE *f;
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struct dep_t *first = 0;
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struct dep_t *current = 0;
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char buffer [4096];
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char *filename = buffer;
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int continuation_line = 0;
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if ( uname ( &un ))
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return 0;
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// check for buffer overflow in following code
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if ( xstrlen ( un. release ) > ( sizeof( buffer ) - 64 ))
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return 0;
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strcpy ( filename, "/lib/modules/" );
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strcat ( filename, un. release );
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strcat ( filename, "/modules.dep" );
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f = fopen ( filename, "r" );
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if ( !f )
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return 0;
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while ( fgets ( buffer, sizeof( buffer), f )) {
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int l = xstrlen ( buffer );
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char *p = 0;
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if ( buffer [l-1] == '\n' ) {
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buffer [l-1] = 0;
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l--;
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}
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if ( l == 0 ) {
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continuation_line = 0;
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continue;
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}
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if ( !continuation_line ) {
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char *col = strchr ( buffer, ':' );
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if ( col ) {
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char *mods;
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char *mod;
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int ext = 0;
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*col = 0;
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mods = strrchr ( buffer, '/' );
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if ( !mods )
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mods = buffer;
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else
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mods++;
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if (( *(col-2) == '.' ) && ( *(col-1) == 'o' ))
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ext = 2;
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mod = xstrndup ( mods, col - mods - ext );
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if ( !current ) {
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first = current = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
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}
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else {
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current-> m_next = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
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current = current-> m_next;
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}
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current-> m_module = mod;
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current-> m_depcnt = 0;
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current-> m_deparr = 0;
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current-> m_next = 0;
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//printf ( "%s:\n", mod );
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p = col + 1;
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}
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else
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p = 0;
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}
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else
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p = buffer;
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if ( p && *p ) {
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char *end = &buffer [l-1];
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char *deps = strrchr ( end, '/' );
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char *dep;
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int ext = 0;
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while ( isblank ( *end ) || ( *end == '\\' ))
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end--;
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deps = strrchr ( p, '/' );
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if ( !deps || ( deps < p )) {
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deps = p;
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while ( isblank ( *deps ))
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deps++;
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}
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else
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deps++;
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if (( *(end-1) == '.' ) && ( *end == 'o' ))
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ext = 2;
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dep = xstrndup ( deps, end - deps - ext + 1 );
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current-> m_depcnt++;
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current-> m_deparr = (char **) xrealloc ( current-> m_deparr, sizeof ( char *) * current-> m_depcnt );
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current-> m_deparr [current-> m_depcnt - 1] = dep;
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//printf ( " %d) %s\n", current-> m_depcnt, current-> m_deparr [current-> m_depcnt -1] );
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}
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if ( buffer [l-1] == '\\' )
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continuation_line = 1;
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else
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continuation_line = 0;
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}
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fclose ( f );
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return first;
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}
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static int mod_process ( struct mod_list_t *list, int do_insert )
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{
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char lcmd [256];
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int rc = 0;
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if ( !list )
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return 1;
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while ( list ) {
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if ( do_insert )
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snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s 2>/dev/null", do_syslog ? "-s" : "", autoclean ? "-k" : "", quiet ? "-q" : "", list-> m_module );
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else
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snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s 2>/dev/null", do_syslog ? "-s" : "", list-> m_module );
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if ( verbose )
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printf ( "%s\n", lcmd );
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if ( !show_only )
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rc |= system ( lcmd );
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list = do_insert ? list-> m_prev : list-> m_next;
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}
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return rc;
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}
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static void check_dep ( char *mod, struct mod_list_t **head, struct mod_list_t **tail )
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{
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struct mod_list_t *find;
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struct dep_t *dt;
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int lm;
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// remove .o extension
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lm = xstrlen ( mod );
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if (( mod [lm-2] == '.' ) && ( mod [lm-1] == 'o' ))
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mod [lm-2] = 0;
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// search for duplicates
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for ( find = *head; find; find = find-> m_next ) {
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if ( !strcmp ( mod, find-> m_module )) {
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// found -> dequeue it
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if ( find-> m_prev )
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find-> m_prev-> m_next = find-> m_next;
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else
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*head = find-> m_next;
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if ( find-> m_next )
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find-> m_next-> m_prev = find-> m_prev;
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else
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*tail = find-> m_prev;
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break; // there can be only one duplicate
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}
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}
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if ( !find ) { // did not find a duplicate
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find = (struct mod_list_t *) xmalloc ( sizeof(struct mod_list_t));
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find-> m_module = mod;
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}
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// enqueue at tail
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if ( *tail )
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(*tail)-> m_next = find;
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find-> m_prev = *tail;
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find-> m_next = 0;
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if ( !*head )
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*head = find;
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*tail = find;
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// check dependencies
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for ( dt = depend; dt; dt = dt-> m_next ) {
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if ( !strcmp ( dt-> m_module, mod )) {
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int i;
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for ( i = 0; i < dt-> m_depcnt; i++ )
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check_dep ( dt-> m_deparr [i], head, tail );
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}
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}
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}
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static int mod_insert ( char *mod, int argc, char **argv )
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{
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struct mod_list_t *tail = 0;
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struct mod_list_t *head = 0;
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int rc = 0;
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// get dep list for module mod
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check_dep ( mod, &head, &tail );
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if ( head && tail ) {
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int i;
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int l = 0;
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// append module args
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l = xstrlen ( mod );
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for ( i = 0; i < argc; i++ )
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l += ( xstrlen ( argv [i] ) + 1 );
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head-> m_module = xstrndup ( mod, l );
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for ( i = 0; i < argc; i++ ) {
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strcat ( head-> m_module, " " );
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strcat ( head-> m_module, argv [i] );
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}
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// process tail ---> head
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rc |= mod_process ( tail, 1 );
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}
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else
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rc = 1;
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return rc;
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}
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static void mod_remove ( char *mod )
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{
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static struct mod_list_t rm_a_dummy = { "-a", 0, 0 };
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struct mod_list_t *head = 0;
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struct mod_list_t *tail = 0;
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if ( mod )
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check_dep ( mod, &head, &tail );
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else // autoclean
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head = tail = &rm_a_dummy;
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if ( head && tail )
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mod_process ( head, 0 ); // process head ---> tail
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}
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extern int modprobe_main(int argc, char** argv)
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{
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int opt;
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int remove_opt = 0;
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autoclean = show_only = quiet = do_syslog = verbose = 0;
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while ((opt = getopt(argc, argv, "acdklnqrst:vVC:")) != -1) {
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switch(opt) {
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case 'c': // no config used
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case 'l': // no pattern matching
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return EXIT_SUCCESS;
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break;
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case 'C': // no config used
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case 't': // no pattern matching
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error_msg_and_die("-t and -C not supported");
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case 'a': // ignore
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case 'd': // ignore
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break;
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case 'k':
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autoclean++;
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break;
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case 'n':
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show_only++;
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break;
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case 'q':
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quiet++;
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break;
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case 'r':
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remove_opt++;
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break;
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case 's':
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do_syslog++;
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break;
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case 'v':
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verbose++;
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break;
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case 'V':
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default:
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show_usage();
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break;
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}
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}
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depend = build_dep ( );
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if ( !depend )
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error_msg_and_die ( "could not parse modules.dep\n" );
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if (remove_opt) {
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do {
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mod_remove ( optind < argc ? argv [optind] : 0 );
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} while ( ++optind < argc );
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return EXIT_SUCCESS;
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}
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if (optind >= argc)
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error_msg_and_die ( "No module or pattern provided\n" );
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return mod_insert ( argv [optind], argc - optind - 1, argv + optind + 1 ) ? \
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EXIT_FAILURE : EXIT_SUCCESS;
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}
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