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-rw-r--r--modprobe.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/modprobe.c b/modprobe.c
new file mode 100644
index 000000000..3cca57dee
--- /dev/null
+++ b/modprobe.c
@@ -0,0 +1,366 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * really dumb modprobe implementation for busybox
+ * Copyright (C) 2001 Lineo, davidm@lineo.com
+ *
+ * BB_FEATURE_MODPROBE_DEPEND stuff was added and is
+ * Copyright (C) 2002 Robert Griebl, griebl@gmx.de
+ *
+ */
+
+#include <getopt.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include "busybox.h"
+
+#define BB_FEATURE_MODPROBE_DEPEND
+
+#ifdef BB_FEATURE_MODPROBE_DEPEND
+
+#include <sys/utsname.h>
+
+/* 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 )
+{
+ ssize_t 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;
+ }
+}
+
+struct dep_t {
+ char * m_module;
+ int m_depcnt;
+ char ** m_deparr;
+
+ struct dep_t * m_next;
+};
+
+
+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;
+ strcpy ( filename, "/lib/modules/" );
+ strcat ( filename, un.release );
+ strcat ( filename, "/modules.dep" );
+
+ if ((fd = open ( filename, O_RDONLY )) < 0)
+ return 0;
+
+ while ( reads ( fd, buffer, sizeof( buffer ))) {
+ char *p;
+ int l = xstrlen ( buffer );
+
+ if ( buffer [l-1] == '\n' ) {
+ 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 = xstrndup ( mods, col - mods - ext );
+
+ if ( !current ) {
+ first = current = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
+ }
+ else {
+ current->m_next = (struct dep_t *) malloc ( sizeof ( struct dep_t ));
+ current = current->m_next;
+ }
+ current->m_module = mod;
+ 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 = 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 );
+
+ return first;
+}
+
+
+static struct dep_t *find_dep ( struct dep_t *dt, char *mod )
+{
+ int lm = xstrlen ( mod );
+ int extpos = 0;
+
+ if (( mod [lm-2] == '.' ) && ( mod [lm-1] == 'o' ))
+ extpos = 2;
+
+ if ( extpos > 0 )
+ mod [lm - extpos] = 0;
+
+ while ( dt ) {
+ if ( !strcmp ( dt->m_module, mod ))
+ break;
+
+ dt = dt->m_next;
+ }
+ if ( extpos > 0 )
+ mod [lm - extpos] = '.';
+
+ return dt;
+}
+
+#define MODPROBE_EXECUTE 0x1
+#define MODPROBE_INSERT 0x2
+#define MODPROBE_REMOVE 0x4
+
+static void check_dep ( char *mod, int do_syslog,
+ int show_only, int verbose, int flags )
+{
+ static struct dep_t *depend = (struct dep_t *) -1;
+ struct dep_t *dt;
+
+ if ( depend == (struct dep_t *) -1 )
+ depend = build_dep ( );
+
+ if (( dt = find_dep ( depend, mod ))) {
+ int i;
+
+ for ( i = 0; i < dt->m_depcnt; i++ )
+ check_dep ( dt->m_deparr [i], do_syslog,
+ show_only, verbose, flags|MODPROBE_EXECUTE);
+ }
+ if ( flags & MODPROBE_EXECUTE ) {
+ char lcmd [256];
+ if ( flags & MODPROBE_INSERT ) {
+ snprintf(lcmd, sizeof(lcmd)-1, "insmod %s -q -k %s 2>/dev/null",
+ do_syslog ? "-s" : "", mod );
+ }
+ if ( flags & MODPROBE_REMOVE ) {
+ snprintf(lcmd, sizeof(lcmd)-1, "insmod %s -q -k %s 2>/dev/null",
+ do_syslog ? "-s" : "", mod );
+ }
+ if ( flags & (MODPROBE_REMOVE|MODPROBE_INSERT) ) {
+ if (verbose)
+ printf("%s\n", lcmd);
+ if (!show_only)
+ system ( lcmd );
+ }
+ }
+}
+
+#endif
+
+
+extern int modprobe_main(int argc, char** argv)
+{
+ 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;
+ char cmd[256];
+
+ 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();
+ break;
+ }
+
+ if (load_type || config) {
+ fprintf(stderr, "-t and -C not supported\n");
+ exit(EXIT_FAILURE);
+ }
+
+ if (showconfig)
+ exit(EXIT_SUCCESS);
+
+ if (list)
+ exit(EXIT_SUCCESS);
+
+ if (remove_opt) {
+ do {
+ snprintf(cmd, sizeof(cmd)-1, "rmmod %s %s %s",
+ optind >= argc ? "-a" : "",
+ do_syslog ? "-s" : "",
+ optind < argc ? argv[optind] : "");
+ if (do_syslog)
+ syslog(LOG_INFO, "%s", cmd);
+ if (verbose)
+ printf("%s\n", cmd);
+ if (!show_only)
+ rc = system(cmd);
+
+#ifdef BB_FEATURE_MODPROBE_DEPEND
+ if ( optind < argc )
+ check_dep ( argv [optind], do_syslog, show_only, verbose, MODPROBE_REMOVE);
+#endif
+ } while (++optind < argc);
+ exit(EXIT_SUCCESS);
+ }
+
+ if (optind >= argc) {
+ fprintf(stderr, "No module or pattern provided\n");
+ exit(EXIT_FAILURE);
+ }
+
+ snprintf(cmd, sizeof(cmd)-1, "insmod %s %s %s",
+ do_syslog ? "-s" : "",
+ quiet ? "-q" : "",
+ autoclean ? "-k" : "");
+
+#ifdef BB_FEATURE_MODPROBE_DEPEND
+ check_dep ( argv [optind], do_syslog, show_only, verbose, MODPROBE_INSERT);
+#endif
+
+ while (optind < argc) {
+ if (strlen(cmd) + 1 + strlen(argv[optind]) >= sizeof(cmd))
+ {
+ error_msg_and_die("Too many module parameters!\n");
+ }
+ strcat(cmd, " ");
+ strcat(cmd, argv[optind]);
+ optind++;
+ }
+ if (do_syslog)
+ syslog(LOG_INFO, "%s", cmd);
+ if (verbose)
+ printf("%s\n", cmd);
+ if (!show_only)
+ rc = system(cmd);
+ else
+ rc = 0;
+
+ exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+
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