[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * simplified modprobe
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| 4 | *
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| 5 | * Copyright (c) 2008 Vladimir Dronnikov
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| 6 | * Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code)
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| 7 | *
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| 8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 9 | */
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| 10 |
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| 11 | //applet:IF_MODPROBE_SMALL(APPLET(modprobe, _BB_DIR_SBIN, _BB_SUID_DROP))
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| 12 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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| 13 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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| 14 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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| 15 | //applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
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| 16 |
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| 17 | #include "libbb.h"
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| 18 | /* After libbb.h, since it needs sys/types.h on some systems */
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| 19 | #include <sys/utsname.h> /* uname() */
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| 20 | #include <fnmatch.h>
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| 21 |
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| 22 | extern int init_module(void *module, unsigned long len, const char *options);
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| 23 | extern int delete_module(const char *module, unsigned flags);
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| 24 | extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
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| 25 |
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| 26 |
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| 27 | #if 1
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| 28 | # define dbg1_error_msg(...) ((void)0)
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| 29 | # define dbg2_error_msg(...) ((void)0)
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| 30 | #else
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| 31 | # define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
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| 32 | # define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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| 33 | #endif
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| 34 |
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| 35 | #define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
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| 36 |
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| 37 | enum {
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| 38 | OPT_q = (1 << 0), /* be quiet */
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| 39 | OPT_r = (1 << 1), /* module removal instead of loading */
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| 40 | };
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| 41 |
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| 42 | typedef struct module_info {
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| 43 | char *pathname;
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| 44 | char *aliases;
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| 45 | char *deps;
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| 46 | } module_info;
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| 47 |
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| 48 | /*
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| 49 | * GLOBALS
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| 50 | */
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| 51 | struct globals {
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| 52 | module_info *modinfo;
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| 53 | char *module_load_options;
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| 54 | smallint dep_bb_seen;
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| 55 | smallint wrote_dep_bb_ok;
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| 56 | unsigned module_count;
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| 57 | int module_found_idx;
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| 58 | unsigned stringbuf_idx;
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| 59 | unsigned stringbuf_size;
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| 60 | char *stringbuf; /* some modules have lots of stuff */
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| 61 | /* for example, drivers/media/video/saa7134/saa7134.ko */
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| 62 | /* therefore having a fixed biggish buffer is not wise */
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| 63 | };
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| 64 | #define G (*ptr_to_globals)
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| 65 | #define modinfo (G.modinfo )
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| 66 | #define dep_bb_seen (G.dep_bb_seen )
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| 67 | #define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
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| 68 | #define module_count (G.module_count )
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| 69 | #define module_found_idx (G.module_found_idx )
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| 70 | #define module_load_options (G.module_load_options)
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| 71 | #define stringbuf_idx (G.stringbuf_idx )
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| 72 | #define stringbuf_size (G.stringbuf_size )
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| 73 | #define stringbuf (G.stringbuf )
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| 74 | #define INIT_G() do { \
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| 75 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 76 | } while (0)
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| 77 |
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| 78 | static void append(const char *s)
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| 79 | {
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| 80 | unsigned len = strlen(s);
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| 81 | if (stringbuf_idx + len + 15 > stringbuf_size) {
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| 82 | stringbuf_size = stringbuf_idx + len + 127;
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| 83 | dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
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| 84 | stringbuf = xrealloc(stringbuf, stringbuf_size);
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| 85 | }
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| 86 | memcpy(stringbuf + stringbuf_idx, s, len);
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| 87 | stringbuf_idx += len;
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| 88 | }
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| 89 |
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| 90 | static void appendc(char c)
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| 91 | {
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| 92 | /* We appendc() only after append(), + 15 trick in append()
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| 93 | * makes it unnecessary to check for overflow here */
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| 94 | stringbuf[stringbuf_idx++] = c;
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| 95 | }
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| 96 |
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| 97 | static void bksp(void)
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| 98 | {
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| 99 | if (stringbuf_idx)
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| 100 | stringbuf_idx--;
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| 101 | }
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| 102 |
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| 103 | static void reset_stringbuf(void)
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| 104 | {
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| 105 | stringbuf_idx = 0;
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| 106 | }
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| 107 |
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| 108 | static char* copy_stringbuf(void)
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| 109 | {
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| 110 | char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
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| 111 | return memcpy(copy, stringbuf, stringbuf_idx);
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| 112 | }
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| 113 |
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| 114 | static char* find_keyword(char *ptr, size_t len, const char *word)
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| 115 | {
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| 116 | int wlen;
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| 117 |
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| 118 | if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
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| 119 | return NULL;
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| 120 |
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| 121 | wlen = strlen(word);
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| 122 | len -= wlen - 1;
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| 123 | while ((ssize_t)len > 0) {
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| 124 | char *old = ptr;
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| 125 | /* search for the first char in word */
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| 126 | ptr = memchr(ptr, *word, len);
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| 127 | if (ptr == NULL) /* no occurance left, done */
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| 128 | break;
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| 129 | if (strncmp(ptr, word, wlen) == 0)
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| 130 | return ptr + wlen; /* found, return ptr past it */
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| 131 | ++ptr;
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| 132 | len -= (ptr - old);
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| 133 | }
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| 134 | return NULL;
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| 135 | }
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| 136 |
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| 137 | static void replace(char *s, char what, char with)
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| 138 | {
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| 139 | while (*s) {
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| 140 | if (what == *s)
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| 141 | *s = with;
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| 142 | ++s;
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| 143 | }
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| 144 | }
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| 145 |
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| 146 | /* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
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| 147 | static char* str_2_list(const char *str)
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| 148 | {
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| 149 | int len = strlen(str) + 1;
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| 150 | char *dst = xmalloc(len + 1);
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| 151 |
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| 152 | dst[len] = '\0';
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| 153 | memcpy(dst, str, len);
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| 154 | //TODO: protect against 2+ spaces: "word word"
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| 155 | replace(dst, ' ', '\0');
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| 156 | return dst;
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| 157 | }
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| 158 |
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| 159 | /* We use error numbers in a loose translation... */
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| 160 | static const char *moderror(int err)
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| 161 | {
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| 162 | switch (err) {
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| 163 | case ENOEXEC:
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| 164 | return "invalid module format";
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| 165 | case ENOENT:
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| 166 | return "unknown symbol in module or invalid parameter";
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| 167 | case ESRCH:
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| 168 | return "module has wrong symbol version";
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| 169 | case EINVAL: /* "invalid parameter" */
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| 170 | return "unknown symbol in module or invalid parameter"
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| 171 | + sizeof("unknown symbol in module or");
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| 172 | default:
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| 173 | return strerror(err);
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| 174 | }
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| 175 | }
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| 176 |
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| 177 | static int load_module(const char *fname, const char *options)
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| 178 | {
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| 179 | #if 1
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| 180 | int r;
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| 181 | size_t len = MAXINT(ssize_t);
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| 182 | char *module_image;
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| 183 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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| 184 |
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| 185 | module_image = xmalloc_open_zipped_read_close(fname, &len);
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| 186 | r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
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| 187 | free(module_image);
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| 188 | dbg1_error_msg("load_module:%d", r);
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| 189 | return r; /* 0 = success */
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| 190 | #else
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| 191 | /* For testing */
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| 192 | dbg1_error_msg("load_module('%s','%s')", fname, options);
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| 193 | return 1;
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| 194 | #endif
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| 195 | }
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| 196 |
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| 197 | static void parse_module(module_info *info, const char *pathname)
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| 198 | {
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| 199 | char *module_image;
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| 200 | char *ptr;
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| 201 | size_t len;
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| 202 | size_t pos;
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| 203 | dbg1_error_msg("parse_module('%s')", pathname);
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| 204 |
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| 205 | /* Read (possibly compressed) module */
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| 206 | len = 64 * 1024 * 1024; /* 64 Mb at most */
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| 207 | module_image = xmalloc_open_zipped_read_close(pathname, &len);
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| 208 | /* module_image == NULL is ok here, find_keyword handles it */
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| 209 | //TODO: optimize redundant module body reads
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| 210 |
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| 211 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
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| 212 | reset_stringbuf();
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| 213 | pos = 0;
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| 214 | while (1) {
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| 215 | ptr = find_keyword(module_image + pos, len - pos, "alias=");
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| 216 | if (!ptr) {
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| 217 | ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
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| 218 | if (!ptr)
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| 219 | break;
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| 220 | /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
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| 221 | * in many modules. What do they mean? */
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| 222 | if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
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| 223 | goto skip;
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| 224 | dbg2_error_msg("alias:'symbol:%s'", ptr);
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| 225 | append("symbol:");
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| 226 | } else {
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| 227 | dbg2_error_msg("alias:'%s'", ptr);
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| 228 | }
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| 229 | append(ptr);
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| 230 | appendc(' ');
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| 231 | skip:
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| 232 | pos = (ptr - module_image);
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| 233 | }
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| 234 | bksp(); /* remove last ' ' */
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| 235 | info->aliases = copy_stringbuf();
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| 236 | replace(info->aliases, '-', '_');
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| 237 |
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| 238 | /* "dependency1 depandency2" */
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| 239 | reset_stringbuf();
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| 240 | ptr = find_keyword(module_image, len, "depends=");
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| 241 | if (ptr && *ptr) {
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| 242 | replace(ptr, ',', ' ');
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| 243 | replace(ptr, '-', '_');
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| 244 | dbg2_error_msg("dep:'%s'", ptr);
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| 245 | append(ptr);
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| 246 | }
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| 247 | info->deps = copy_stringbuf();
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| 248 |
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| 249 | free(module_image);
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| 250 | }
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| 251 |
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| 252 | static int pathname_matches_modname(const char *pathname, const char *modname)
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| 253 | {
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| 254 | const char *fname = bb_get_last_path_component_nostrip(pathname);
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| 255 | const char *suffix = strrstr(fname, ".ko");
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| 256 | //TODO: can do without malloc?
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| 257 | char *name = xstrndup(fname, suffix - fname);
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| 258 | int r;
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| 259 | replace(name, '-', '_');
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| 260 | r = (strcmp(name, modname) == 0);
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| 261 | free(name);
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| 262 | return r;
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| 263 | }
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| 264 |
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| 265 | static FAST_FUNC int fileAction(const char *pathname,
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| 266 | struct stat *sb UNUSED_PARAM,
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| 267 | void *modname_to_match,
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| 268 | int depth UNUSED_PARAM)
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| 269 | {
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| 270 | int cur;
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| 271 | const char *fname;
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| 272 |
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| 273 | pathname += 2; /* skip "./" */
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| 274 | fname = bb_get_last_path_component_nostrip(pathname);
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| 275 | if (!strrstr(fname, ".ko")) {
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| 276 | dbg1_error_msg("'%s' is not a module", pathname);
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| 277 | return TRUE; /* not a module, continue search */
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| 278 | }
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| 279 |
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| 280 | cur = module_count++;
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| 281 | modinfo = xrealloc_vector(modinfo, 12, cur);
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| 282 | modinfo[cur].pathname = xstrdup(pathname);
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| 283 | /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
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| 284 | /*modinfo[cur+1].pathname = NULL;*/
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| 285 |
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| 286 | if (!pathname_matches_modname(fname, modname_to_match)) {
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| 287 | dbg1_error_msg("'%s' module name doesn't match", pathname);
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| 288 | return TRUE; /* module name doesn't match, continue search */
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| 289 | }
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| 290 |
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| 291 | dbg1_error_msg("'%s' module name matches", pathname);
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| 292 | module_found_idx = cur;
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| 293 | parse_module(&modinfo[cur], pathname);
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| 294 |
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| 295 | if (!(option_mask32 & OPT_r)) {
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| 296 | if (load_module(pathname, module_load_options) == 0) {
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| 297 | /* Load was successful, there is nothing else to do.
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| 298 | * This can happen ONLY for "top-level" module load,
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| 299 | * not a dep, because deps dont do dirscan. */
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| 300 | exit(EXIT_SUCCESS);
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| 301 | }
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| 302 | }
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| 303 |
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| 304 | return TRUE;
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| 305 | }
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| 306 |
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| 307 | static int load_dep_bb(void)
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| 308 | {
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| 309 | char *line;
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| 310 | FILE *fp = fopen_for_read(DEPFILE_BB);
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| 311 |
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| 312 | if (!fp)
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| 313 | return 0;
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| 314 |
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| 315 | dep_bb_seen = 1;
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| 316 | dbg1_error_msg("loading "DEPFILE_BB);
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| 317 |
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| 318 | /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
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| 319 | * we scanned the dir and found no module by name, then we search
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| 320 | * for alias (full scan), and we decided to generate modprobe.dep.bb.
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| 321 | * But we see modprobe.dep.bb.new! Other modprobe is at work!
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| 322 | * We wait and other modprobe renames it to modprobe.dep.bb.
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| 323 | * Now we can use it.
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| 324 | * But we already have modinfo[] filled, and "module_count = 0"
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| 325 | * makes us start anew. Yes, we leak modinfo[].xxx pointers -
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| 326 | * there is not much of data there anyway. */
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| 327 | module_count = 0;
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| 328 | memset(&modinfo[0], 0, sizeof(modinfo[0]));
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| 329 |
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| 330 | while ((line = xmalloc_fgetline(fp)) != NULL) {
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| 331 | char* space;
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| 332 | char* linebuf;
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| 333 | int cur;
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| 334 |
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| 335 | if (!line[0]) {
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| 336 | free(line);
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| 337 | continue;
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| 338 | }
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| 339 | space = strchrnul(line, ' ');
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| 340 | cur = module_count++;
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| 341 | modinfo = xrealloc_vector(modinfo, 12, cur);
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| 342 | /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
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| 343 | modinfo[cur].pathname = line; /* we take ownership of malloced block here */
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| 344 | if (*space)
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| 345 | *space++ = '\0';
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| 346 | modinfo[cur].aliases = space;
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| 347 | linebuf = xmalloc_fgetline(fp);
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| 348 | modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
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| 349 | if (modinfo[cur].deps[0]) {
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| 350 | /* deps are not "", so next line must be empty */
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| 351 | line = xmalloc_fgetline(fp);
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| 352 | /* Refuse to work with damaged config file */
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| 353 | if (line && line[0])
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| 354 | bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
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| 355 | free(line);
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| 356 | }
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| 357 | }
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| 358 | return 1;
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| 359 | }
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| 360 |
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| 361 | static int start_dep_bb_writeout(void)
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| 362 | {
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| 363 | int fd;
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| 364 |
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| 365 | /* depmod -n: write result to stdout */
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| 366 | if (applet_name[0] == 'd' && (option_mask32 & 1))
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| 367 | return STDOUT_FILENO;
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| 368 |
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| 369 | fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
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| 370 | if (fd < 0) {
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| 371 | if (errno == EEXIST) {
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| 372 | int count = 5 * 20;
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| 373 | dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
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| 374 | while (1) {
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| 375 | usleep(1000*1000 / 20);
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| 376 | if (load_dep_bb()) {
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| 377 | dbg1_error_msg(DEPFILE_BB" appeared");
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| 378 | return -2; /* magic number */
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| 379 | }
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| 380 | if (!--count)
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| 381 | break;
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| 382 | }
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| 383 | bb_error_msg("deleting stale %s", DEPFILE_BB".new");
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| 384 | fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
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| 385 | }
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| 386 | }
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| 387 | dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
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| 388 | return fd;
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| 389 | }
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| 390 |
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| 391 | static void write_out_dep_bb(int fd)
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| 392 | {
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| 393 | int i;
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| 394 | FILE *fp;
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| 395 |
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| 396 | /* We want good error reporting. fdprintf is not good enough. */
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| 397 | fp = xfdopen_for_write(fd);
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| 398 | i = 0;
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| 399 | while (modinfo[i].pathname) {
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| 400 | fprintf(fp, "%s%s%s\n" "%s%s\n",
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| 401 | modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
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| 402 | modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
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| 403 | i++;
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| 404 | }
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| 405 | /* Badly formatted depfile is a no-no. Be paranoid. */
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| 406 | errno = 0;
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| 407 | if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
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| 408 | goto err;
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| 409 |
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| 410 | if (fd == STDOUT_FILENO) /* it was depmod -n */
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| 411 | goto ok;
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| 412 |
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| 413 | if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
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| 414 | err:
|
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| 415 | bb_perror_msg("can't create '%s'", DEPFILE_BB);
|
---|
| 416 | unlink(DEPFILE_BB".new");
|
---|
| 417 | } else {
|
---|
| 418 | ok:
|
---|
| 419 | wrote_dep_bb_ok = 1;
|
---|
| 420 | dbg1_error_msg("created "DEPFILE_BB);
|
---|
| 421 | }
|
---|
| 422 | }
|
---|
| 423 |
|
---|
| 424 | static module_info* find_alias(const char *alias)
|
---|
| 425 | {
|
---|
| 426 | int i;
|
---|
| 427 | int dep_bb_fd;
|
---|
| 428 | module_info *result;
|
---|
| 429 | dbg1_error_msg("find_alias('%s')", alias);
|
---|
| 430 |
|
---|
| 431 | try_again:
|
---|
| 432 | /* First try to find by name (cheaper) */
|
---|
| 433 | i = 0;
|
---|
| 434 | while (modinfo[i].pathname) {
|
---|
| 435 | if (pathname_matches_modname(modinfo[i].pathname, alias)) {
|
---|
| 436 | dbg1_error_msg("found '%s' in module '%s'",
|
---|
| 437 | alias, modinfo[i].pathname);
|
---|
| 438 | if (!modinfo[i].aliases) {
|
---|
| 439 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
| 440 | }
|
---|
| 441 | return &modinfo[i];
|
---|
| 442 | }
|
---|
| 443 | i++;
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 | /* Ok, we definitely have to scan module bodies. This is a good
|
---|
| 447 | * moment to generate modprobe.dep.bb, if it does not exist yet */
|
---|
| 448 | dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
|
---|
| 449 | if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
|
---|
| 450 | goto try_again;
|
---|
| 451 |
|
---|
| 452 | /* Scan all module bodies, extract modinfo (it contains aliases) */
|
---|
| 453 | i = 0;
|
---|
| 454 | result = NULL;
|
---|
| 455 | while (modinfo[i].pathname) {
|
---|
| 456 | char *desc, *s;
|
---|
| 457 | if (!modinfo[i].aliases) {
|
---|
| 458 | parse_module(&modinfo[i], modinfo[i].pathname);
|
---|
| 459 | }
|
---|
| 460 | if (result) {
|
---|
| 461 | i++;
|
---|
| 462 | continue;
|
---|
| 463 | }
|
---|
| 464 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */
|
---|
| 465 | desc = str_2_list(modinfo[i].aliases);
|
---|
| 466 | /* Does matching substring exist? */
|
---|
| 467 | for (s = desc; *s; s += strlen(s) + 1) {
|
---|
| 468 | /* Aliases in module bodies can be defined with
|
---|
| 469 | * shell patterns. Example:
|
---|
| 470 | * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
|
---|
| 471 | * Plain strcmp() won't catch that */
|
---|
| 472 | if (fnmatch(s, alias, 0) == 0) {
|
---|
| 473 | dbg1_error_msg("found alias '%s' in module '%s'",
|
---|
| 474 | alias, modinfo[i].pathname);
|
---|
| 475 | result = &modinfo[i];
|
---|
| 476 | break;
|
---|
| 477 | }
|
---|
| 478 | }
|
---|
| 479 | free(desc);
|
---|
| 480 | if (result && dep_bb_fd < 0)
|
---|
| 481 | return result;
|
---|
| 482 | i++;
|
---|
| 483 | }
|
---|
| 484 |
|
---|
| 485 | /* Create module.dep.bb if needed */
|
---|
| 486 | if (dep_bb_fd >= 0) {
|
---|
| 487 | write_out_dep_bb(dep_bb_fd);
|
---|
| 488 | }
|
---|
| 489 |
|
---|
| 490 | dbg1_error_msg("find_alias '%s' returns %p", alias, result);
|
---|
| 491 | return result;
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
|
---|
| 495 | // TODO: open only once, invent config_rewind()
|
---|
| 496 | static int already_loaded(const char *name)
|
---|
| 497 | {
|
---|
| 498 | int ret = 0;
|
---|
| 499 | char *s;
|
---|
| 500 | parser_t *parser = config_open2("/proc/modules", xfopen_for_read);
|
---|
| 501 | while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
|
---|
| 502 | if (strcmp(s, name) == 0) {
|
---|
| 503 | ret = 1;
|
---|
| 504 | break;
|
---|
| 505 | }
|
---|
| 506 | }
|
---|
| 507 | config_close(parser);
|
---|
| 508 | return ret;
|
---|
| 509 | }
|
---|
| 510 | #else
|
---|
| 511 | #define already_loaded(name) is_rmmod
|
---|
| 512 | #endif
|
---|
| 513 |
|
---|
| 514 | /*
|
---|
| 515 | * Given modules definition and module name (or alias, or symbol)
|
---|
| 516 | * load/remove the module respecting dependencies.
|
---|
| 517 | * NB: also called by depmod with bogus name "/",
|
---|
| 518 | * just in order to force modprobe.dep.bb creation.
|
---|
| 519 | */
|
---|
| 520 | #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
| 521 | #define process_module(a,b) process_module(a)
|
---|
| 522 | #define cmdline_options ""
|
---|
| 523 | #endif
|
---|
| 524 | static void process_module(char *name, const char *cmdline_options)
|
---|
| 525 | {
|
---|
| 526 | char *s, *deps, *options;
|
---|
| 527 | module_info *info;
|
---|
| 528 | int is_rmmod = (option_mask32 & OPT_r) != 0;
|
---|
| 529 | dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
|
---|
| 530 |
|
---|
| 531 | replace(name, '-', '_');
|
---|
| 532 |
|
---|
| 533 | dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
|
---|
| 534 | if (already_loaded(name) != is_rmmod) {
|
---|
| 535 | dbg1_error_msg("nothing to do for '%s'", name);
|
---|
| 536 | return;
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | options = NULL;
|
---|
| 540 | if (!is_rmmod) {
|
---|
| 541 | char *opt_filename = xasprintf("/etc/modules/%s", name);
|
---|
| 542 | options = xmalloc_open_read_close(opt_filename, NULL);
|
---|
| 543 | if (options)
|
---|
| 544 | replace(options, '\n', ' ');
|
---|
| 545 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
| 546 | if (cmdline_options) {
|
---|
| 547 | /* NB: cmdline_options always have one leading ' '
|
---|
| 548 | * (see main()), we remove it here */
|
---|
| 549 | char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
|
---|
| 550 | cmdline_options + 1, options);
|
---|
| 551 | free(options);
|
---|
| 552 | options = op;
|
---|
| 553 | }
|
---|
| 554 | #endif
|
---|
| 555 | free(opt_filename);
|
---|
| 556 | module_load_options = options;
|
---|
| 557 | dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | if (!module_count) {
|
---|
| 561 | /* Scan module directory. This is done only once.
|
---|
| 562 | * It will attempt module load, and will exit(EXIT_SUCCESS)
|
---|
| 563 | * on success. */
|
---|
| 564 | module_found_idx = -1;
|
---|
| 565 | recursive_action(".",
|
---|
| 566 | ACTION_RECURSE, /* flags */
|
---|
| 567 | fileAction, /* file action */
|
---|
| 568 | NULL, /* dir action */
|
---|
| 569 | name, /* user data */
|
---|
| 570 | 0); /* depth */
|
---|
| 571 | dbg1_error_msg("dirscan complete");
|
---|
| 572 | /* Module was not found, or load failed, or is_rmmod */
|
---|
| 573 | if (module_found_idx >= 0) { /* module was found */
|
---|
| 574 | info = &modinfo[module_found_idx];
|
---|
| 575 | } else { /* search for alias, not a plain module name */
|
---|
| 576 | info = find_alias(name);
|
---|
| 577 | }
|
---|
| 578 | } else {
|
---|
| 579 | info = find_alias(name);
|
---|
| 580 | }
|
---|
| 581 |
|
---|
| 582 | // Problem here: there can be more than one module
|
---|
| 583 | // for the given alias. For example,
|
---|
| 584 | // "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
|
---|
| 585 | // ata_piix because it has an alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
|
---|
| 586 | // and ata_generic, it has an alias "alias=pci:v*d*sv*sd*bc01sc01i*"
|
---|
| 587 | // Standard modprobe would load them both.
|
---|
| 588 | // In this code, find_alias() returns only the first matching module.
|
---|
| 589 |
|
---|
| 590 | /* rmmod? unload it by name */
|
---|
| 591 | if (is_rmmod) {
|
---|
| 592 | if (delete_module(name, O_NONBLOCK | O_EXCL) != 0) {
|
---|
| 593 | if (!(option_mask32 & OPT_q))
|
---|
| 594 | bb_perror_msg("remove '%s'", name);
|
---|
| 595 | goto ret;
|
---|
| 596 | }
|
---|
| 597 | /* N.B. we do not stop here -
|
---|
| 598 | * continue to unload modules on which the module depends:
|
---|
| 599 | * "-r --remove: option causes modprobe to remove a module.
|
---|
| 600 | * If the modules it depends on are also unused, modprobe
|
---|
| 601 | * will try to remove them, too." */
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | if (!info) {
|
---|
| 605 | /* both dirscan and find_alias found nothing */
|
---|
| 606 | if (!is_rmmod && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
|
---|
| 607 | bb_error_msg("module '%s' not found", name);
|
---|
| 608 | //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
|
---|
| 609 | goto ret;
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | /* Iterate thru dependencies, trying to (un)load them */
|
---|
| 613 | deps = str_2_list(info->deps);
|
---|
| 614 | for (s = deps; *s; s += strlen(s) + 1) {
|
---|
| 615 | //if (strcmp(name, s) != 0) // N.B. do loops exist?
|
---|
| 616 | dbg1_error_msg("recurse on dep '%s'", s);
|
---|
| 617 | process_module(s, NULL);
|
---|
| 618 | dbg1_error_msg("recurse on dep '%s' done", s);
|
---|
| 619 | }
|
---|
| 620 | free(deps);
|
---|
| 621 |
|
---|
| 622 | /* modprobe -> load it */
|
---|
| 623 | if (!is_rmmod) {
|
---|
| 624 | if (!options || strstr(options, "blacklist") == NULL) {
|
---|
| 625 | errno = 0;
|
---|
| 626 | if (load_module(info->pathname, options) != 0) {
|
---|
| 627 | if (EEXIST != errno) {
|
---|
| 628 | bb_error_msg("'%s': %s",
|
---|
| 629 | info->pathname,
|
---|
| 630 | moderror(errno));
|
---|
| 631 | } else {
|
---|
| 632 | dbg1_error_msg("'%s': %s",
|
---|
| 633 | info->pathname,
|
---|
| 634 | moderror(errno));
|
---|
| 635 | }
|
---|
| 636 | }
|
---|
| 637 | } else {
|
---|
| 638 | dbg1_error_msg("'%s': blacklisted", info->pathname);
|
---|
| 639 | }
|
---|
| 640 | }
|
---|
| 641 | ret:
|
---|
| 642 | free(options);
|
---|
| 643 | //TODO: return load attempt result from process_module.
|
---|
| 644 | //If dep didn't load ok, continuing makes little sense.
|
---|
| 645 | }
|
---|
| 646 | #undef cmdline_options
|
---|
| 647 |
|
---|
| 648 |
|
---|
| 649 | /* For reference, module-init-tools v3.4 options:
|
---|
| 650 |
|
---|
| 651 | # insmod
|
---|
| 652 | Usage: insmod filename [args]
|
---|
| 653 |
|
---|
| 654 | # rmmod --help
|
---|
| 655 | Usage: rmmod [-fhswvV] modulename ...
|
---|
| 656 | -f (or --force) forces a module unload, and may crash your
|
---|
| 657 | machine. This requires the Forced Module Removal option
|
---|
| 658 | when the kernel was compiled.
|
---|
| 659 | -h (or --help) prints this help text
|
---|
| 660 | -s (or --syslog) says use syslog, not stderr
|
---|
| 661 | -v (or --verbose) enables more messages
|
---|
| 662 | -V (or --version) prints the version code
|
---|
| 663 | -w (or --wait) begins module removal even if it is used
|
---|
| 664 | and will stop new users from accessing the module (so it
|
---|
| 665 | should eventually fall to zero).
|
---|
| 666 |
|
---|
| 667 | # modprobe
|
---|
| 668 | Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
|
---|
| 669 | [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
|
---|
| 670 | modprobe -r [-n] [-i] [-v] <modulename> ...
|
---|
| 671 | modprobe -l -t <dirname> [ -a <modulename> ...]
|
---|
| 672 |
|
---|
| 673 | # depmod --help
|
---|
| 674 | depmod 3.4 -- part of module-init-tools
|
---|
| 675 | depmod -[aA] [-n -e -v -q -V -r -u]
|
---|
| 676 | [-b basedirectory] [forced_version]
|
---|
| 677 | depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
|
---|
| 678 | If no arguments (except options) are given, "depmod -a" is assumed.
|
---|
| 679 | depmod will output a dependency list suitable for the modprobe utility.
|
---|
| 680 | Options:
|
---|
| 681 | -a, --all Probe all modules
|
---|
| 682 | -A, --quick Only does the work if there's a new module
|
---|
| 683 | -n, --show Write the dependency file on stdout only
|
---|
| 684 | -e, --errsyms Report not supplied symbols
|
---|
| 685 | -V, --version Print the release version
|
---|
| 686 | -v, --verbose Enable verbose mode
|
---|
| 687 | -h, --help Print this usage message
|
---|
| 688 | The following options are useful for people managing distributions:
|
---|
| 689 | -b basedirectory
|
---|
| 690 | --basedir basedirectory
|
---|
| 691 | Use an image of a module tree
|
---|
| 692 | -F kernelsyms
|
---|
| 693 | --filesyms kernelsyms
|
---|
| 694 | Use the file instead of the current kernel symbols
|
---|
| 695 | */
|
---|
| 696 |
|
---|
| 697 | //usage:#if ENABLE_MODPROBE_SMALL
|
---|
| 698 |
|
---|
| 699 | //usage:#define depmod_trivial_usage NOUSAGE_STR
|
---|
| 700 | //usage:#define depmod_full_usage ""
|
---|
| 701 |
|
---|
| 702 | //usage:#define lsmod_trivial_usage
|
---|
| 703 | //usage: ""
|
---|
| 704 | //usage:#define lsmod_full_usage "\n\n"
|
---|
| 705 | //usage: "List the currently loaded kernel modules"
|
---|
| 706 |
|
---|
| 707 | //usage:#define insmod_trivial_usage
|
---|
| 708 | //usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
|
---|
| 709 | //usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
|
---|
| 710 | //usage: "[SYMBOL=VALUE]..."
|
---|
| 711 | //usage:#define insmod_full_usage "\n\n"
|
---|
| 712 | //usage: "Load the specified kernel modules into the kernel"
|
---|
| 713 | //usage: IF_FEATURE_2_4_MODULES( "\n"
|
---|
| 714 | //usage: "\nOptions:"
|
---|
| 715 | //usage: "\n -f Force module to load into the wrong kernel version"
|
---|
| 716 | //usage: "\n -k Make module autoclean-able"
|
---|
| 717 | //usage: "\n -v Verbose"
|
---|
| 718 | //usage: "\n -q Quiet"
|
---|
| 719 | //usage: "\n -L Lock: prevent simultaneous loads"
|
---|
| 720 | //usage: IF_FEATURE_INSMOD_LOAD_MAP(
|
---|
| 721 | //usage: "\n -m Output load map to stdout"
|
---|
| 722 | //usage: )
|
---|
| 723 | //usage: "\n -x Don't export externs"
|
---|
| 724 | //usage: )
|
---|
| 725 |
|
---|
| 726 | //usage:#define rmmod_trivial_usage
|
---|
| 727 | //usage: "[-wfa] [MODULE]..."
|
---|
| 728 | //usage:#define rmmod_full_usage "\n\n"
|
---|
| 729 | //usage: "Unload kernel modules\n"
|
---|
| 730 | //usage: "\nOptions:"
|
---|
| 731 | //usage: "\n -w Wait until the module is no longer used"
|
---|
| 732 | //usage: "\n -f Force unload"
|
---|
| 733 | //usage: "\n -a Remove all unused modules (recursively)"
|
---|
| 734 | //usage:
|
---|
| 735 | //usage:#define rmmod_example_usage
|
---|
| 736 | //usage: "$ rmmod tulip\n"
|
---|
| 737 |
|
---|
| 738 | //usage:#define modprobe_trivial_usage
|
---|
| 739 | //usage: "[-qfwrsv] MODULE [symbol=value]..."
|
---|
| 740 | //usage:#define modprobe_full_usage "\n\n"
|
---|
| 741 | //usage: "Options:"
|
---|
| 742 | //usage: "\n -r Remove MODULE (stacks) or do autoclean"
|
---|
| 743 | //usage: "\n -q Quiet"
|
---|
| 744 | //usage: "\n -v Verbose"
|
---|
| 745 | //usage: "\n -f Force"
|
---|
| 746 | //usage: "\n -w Wait for unload"
|
---|
| 747 | //usage: "\n -s Report via syslog instead of stderr"
|
---|
| 748 |
|
---|
| 749 | //usage:#endif
|
---|
| 750 |
|
---|
| 751 | int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 752 | int modprobe_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 753 | {
|
---|
| 754 | struct utsname uts;
|
---|
| 755 | char applet0 = applet_name[0];
|
---|
| 756 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
|
---|
| 757 |
|
---|
| 758 | /* are we lsmod? -> just dump /proc/modules */
|
---|
| 759 | if ('l' == applet0) {
|
---|
| 760 | xprint_and_close_file(xfopen_for_read("/proc/modules"));
|
---|
| 761 | return EXIT_SUCCESS;
|
---|
| 762 | }
|
---|
| 763 |
|
---|
| 764 | INIT_G();
|
---|
| 765 |
|
---|
| 766 | /* Prevent ugly corner cases with no modules at all */
|
---|
| 767 | modinfo = xzalloc(sizeof(modinfo[0]));
|
---|
| 768 |
|
---|
| 769 | if ('i' != applet0) { /* not insmod */
|
---|
| 770 | /* Goto modules directory */
|
---|
| 771 | xchdir(CONFIG_DEFAULT_MODULES_DIR);
|
---|
| 772 | }
|
---|
| 773 | uname(&uts); /* never fails */
|
---|
| 774 |
|
---|
| 775 | /* depmod? */
|
---|
| 776 | if ('d' == applet0) {
|
---|
| 777 | /* Supported:
|
---|
| 778 | * -n: print result to stdout
|
---|
| 779 | * -a: process all modules (default)
|
---|
| 780 | * optional VERSION parameter
|
---|
| 781 | * Ignored:
|
---|
| 782 | * -A: do work only if a module is newer than depfile
|
---|
| 783 | * -e: report any symbols which a module needs
|
---|
| 784 | * which are not supplied by other modules or the kernel
|
---|
| 785 | * -F FILE: System.map (symbols for -e)
|
---|
| 786 | * -q, -r, -u: noop?
|
---|
| 787 | * Not supported:
|
---|
| 788 | * -b BASEDIR: (TODO!) modules are in
|
---|
| 789 | * $BASEDIR/lib/modules/$VERSION
|
---|
| 790 | * -v: human readable deps to stdout
|
---|
| 791 | * -V: version (don't want to support it - people may depend
|
---|
| 792 | * on it as an indicator of "standard" depmod)
|
---|
| 793 | * -h: help (well duh)
|
---|
| 794 | * module1.o module2.o parameters (just ignored for now)
|
---|
| 795 | */
|
---|
| 796 | getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
|
---|
| 797 | argv += optind;
|
---|
| 798 | /* if (argv[0] && argv[1]) bb_show_usage(); */
|
---|
| 799 | /* Goto $VERSION directory */
|
---|
| 800 | xchdir(argv[0] ? argv[0] : uts.release);
|
---|
| 801 | /* Force full module scan by asking to find a bogus module.
|
---|
| 802 | * This will generate modules.dep.bb as a side effect. */
|
---|
| 803 | process_module((char*)"/", NULL);
|
---|
| 804 | return !wrote_dep_bb_ok;
|
---|
| 805 | }
|
---|
| 806 |
|
---|
| 807 | /* insmod, modprobe, rmmod require at least one argument */
|
---|
| 808 | opt_complementary = "-1";
|
---|
| 809 | /* only -q (quiet) and -r (rmmod),
|
---|
| 810 | * the rest are accepted and ignored (compat) */
|
---|
| 811 | getopt32(argv, "qrfsvw");
|
---|
| 812 | argv += optind;
|
---|
| 813 |
|
---|
| 814 | /* are we rmmod? -> simulate modprobe -r */
|
---|
| 815 | if ('r' == applet0) {
|
---|
| 816 | option_mask32 |= OPT_r;
|
---|
| 817 | }
|
---|
| 818 |
|
---|
| 819 | if ('i' != applet0) { /* not insmod */
|
---|
| 820 | /* Goto $VERSION directory */
|
---|
| 821 | xchdir(uts.release);
|
---|
| 822 | }
|
---|
| 823 |
|
---|
| 824 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
|
---|
| 825 | /* If not rmmod, parse possible module options given on command line.
|
---|
| 826 | * insmod/modprobe takes one module name, the rest are parameters. */
|
---|
| 827 | options = NULL;
|
---|
| 828 | if ('r' != applet0) {
|
---|
| 829 | char **arg = argv;
|
---|
| 830 | while (*++arg) {
|
---|
| 831 | /* Enclose options in quotes */
|
---|
| 832 | char *s = options;
|
---|
| 833 | options = xasprintf("%s \"%s\"", s ? s : "", *arg);
|
---|
| 834 | free(s);
|
---|
| 835 | *arg = NULL;
|
---|
| 836 | }
|
---|
| 837 | }
|
---|
| 838 | #else
|
---|
| 839 | if ('r' != applet0)
|
---|
| 840 | argv[1] = NULL;
|
---|
| 841 | #endif
|
---|
| 842 |
|
---|
| 843 | if ('i' == applet0) { /* insmod */
|
---|
| 844 | size_t len;
|
---|
| 845 | void *map;
|
---|
| 846 |
|
---|
| 847 | len = MAXINT(ssize_t);
|
---|
| 848 | map = xmalloc_open_zipped_read_close(*argv, &len);
|
---|
| 849 | if (!map)
|
---|
| 850 | bb_perror_msg_and_die("can't read '%s'", *argv);
|
---|
| 851 | if (init_module(map, len,
|
---|
| 852 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
|
---|
| 853 | IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
|
---|
| 854 | ) != 0
|
---|
| 855 | ) {
|
---|
| 856 | bb_error_msg_and_die("can't insert '%s': %s",
|
---|
| 857 | *argv, moderror(errno));
|
---|
| 858 | }
|
---|
| 859 | return 0;
|
---|
| 860 | }
|
---|
| 861 |
|
---|
| 862 | /* Try to load modprobe.dep.bb */
|
---|
| 863 | load_dep_bb();
|
---|
| 864 |
|
---|
| 865 | /* Load/remove modules.
|
---|
| 866 | * Only rmmod loops here, modprobe has only argv[0] */
|
---|
| 867 | do {
|
---|
| 868 | process_module(*argv, options);
|
---|
| 869 | } while (*++argv);
|
---|
| 870 |
|
---|
| 871 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 872 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
|
---|
| 873 | }
|
---|
| 874 | return EXIT_SUCCESS;
|
---|
| 875 | }
|
---|