| /* |
| * Common modutils related functions for busybox |
| * |
| * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| #include "modutils.h" |
| |
| #ifdef __UCLIBC__ |
| extern int init_module(void *module, unsigned long len, const char *options); |
| extern int delete_module(const char *module, unsigned int flags); |
| #else |
| # include <sys/syscall.h> |
| # define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts) |
| # define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags) |
| #endif |
| |
| void FAST_FUNC replace(char *s, char what, char with) |
| { |
| while (*s) { |
| if (what == *s) |
| *s = with; |
| ++s; |
| } |
| } |
| |
| char* FAST_FUNC replace_underscores(char *s) |
| { |
| replace(s, '-', '_'); |
| return s; |
| } |
| |
| int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim) |
| { |
| char *tok; |
| int len = 0; |
| |
| while ((tok = strsep(&string, delim)) != NULL) { |
| if (tok[0] == '\0') |
| continue; |
| llist_add_to_end(llist, xstrdup(tok)); |
| len += strlen(tok); |
| } |
| return len; |
| } |
| |
| char* FAST_FUNC filename2modname(const char *filename, char *modname) |
| { |
| char local_modname[MODULE_NAME_LEN]; |
| int i; |
| const char *from; |
| |
| if (filename == NULL) |
| return NULL; |
| if (modname == NULL) |
| modname = local_modname; |
| // Disabled since otherwise "modprobe dir/name" would work |
| // as if it is "modprobe name". It is unclear why |
| // 'basenamization' was here in the first place. |
| //from = bb_get_last_path_component_nostrip(filename); |
| from = filename; |
| for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++) |
| modname[i] = (from[i] == '-') ? '_' : from[i]; |
| modname[i] = '\0'; |
| |
| if (modname == local_modname) |
| return xstrdup(modname); |
| |
| return modname; |
| } |
| |
| char* FAST_FUNC parse_cmdline_module_options(char **argv, int quote_spaces) |
| { |
| char *options; |
| int optlen; |
| |
| options = xzalloc(1); |
| optlen = 0; |
| while (*++argv) { |
| const char *fmt; |
| const char *var; |
| const char *val; |
| |
| var = *argv; |
| options = xrealloc(options, optlen + 2 + strlen(var) + 2); |
| fmt = "%.*s%s "; |
| val = strchrnul(var, '='); |
| if (quote_spaces) { |
| /* |
| * modprobe (module-init-tools version 3.11.1) compat: |
| * quote only value: |
| * var="val with spaces", not "var=val with spaces" |
| * (note: var *name* is not checked for spaces!) |
| */ |
| if (*val) { /* has var=val format. skip '=' */ |
| val++; |
| if (strchr(val, ' ')) |
| fmt = "%.*s\"%s\" "; |
| } |
| } |
| optlen += sprintf(options + optlen, fmt, (int)(val - var), var, val); |
| } |
| /* Remove trailing space. Disabled */ |
| /* if (optlen != 0) options[optlen-1] = '\0'; */ |
| return options; |
| } |
| |
| #if ENABLE_FEATURE_INSMOD_TRY_MMAP |
| void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p) |
| { |
| /* We have user reports of failure to load 3MB module |
| * on a 16MB RAM machine. Apparently even a transient |
| * memory spike to 6MB during module load |
| * is too big for that system. */ |
| void *image; |
| struct stat st; |
| int fd; |
| |
| fd = xopen(filename, O_RDONLY); |
| fstat(fd, &st); |
| image = NULL; |
| /* st.st_size is off_t, we can't just pass it to mmap */ |
| if (st.st_size <= *image_size_p) { |
| size_t image_size = st.st_size; |
| image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| if (image == MAP_FAILED) { |
| image = NULL; |
| } else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) { |
| /* No ELF signature. Compressed module? */ |
| munmap(image, image_size); |
| image = NULL; |
| } else { |
| /* Success. Report the size */ |
| *image_size_p = image_size; |
| } |
| } |
| close(fd); |
| return image; |
| } |
| #endif |
| |
| /* Return: |
| * 0 on success, |
| * -errno on open/read error, |
| * errno on init_module() error |
| */ |
| int FAST_FUNC bb_init_module(const char *filename, const char *options) |
| { |
| size_t image_size; |
| char *image; |
| int rc; |
| bool mmaped; |
| |
| if (!options) |
| options = ""; |
| |
| //TODO: audit bb_init_module_24 to match error code convention |
| #if ENABLE_FEATURE_2_4_MODULES |
| if (get_linux_version_code() < KERNEL_VERSION(2,6,0)) |
| return bb_init_module_24(filename, options); |
| #endif |
| |
| image_size = INT_MAX - 4095; |
| mmaped = 0; |
| image = try_to_mmap_module(filename, &image_size); |
| if (image) { |
| mmaped = 1; |
| } else { |
| errno = ENOMEM; /* may be changed by e.g. open errors below */ |
| image = xmalloc_open_zipped_read_close(filename, &image_size); |
| if (!image) |
| return -errno; |
| } |
| |
| errno = 0; |
| init_module(image, image_size, options); |
| rc = errno; |
| if (mmaped) |
| munmap(image, image_size); |
| else |
| free(image); |
| return rc; |
| } |
| |
| int FAST_FUNC bb_delete_module(const char *module, unsigned int flags) |
| { |
| errno = 0; |
| delete_module(module, flags); |
| return errno; |
| } |
| |
| /* Note: not suitable for delete_module() errnos. |
| * For them, probably only EWOULDBLOCK needs explaining: |
| * "Other modules depend on us". So far we don't do such |
| * translation and don't use moderror() for removal errors. |
| */ |
| const char* FAST_FUNC moderror(int err) |
| { |
| switch (err) { |
| case -1: /* btw: it's -EPERM */ |
| return "no such module"; |
| case ENOEXEC: |
| return "invalid module format"; |
| case ENOENT: |
| return "unknown symbol in module, or unknown parameter"; |
| case ESRCH: |
| return "module has wrong symbol version"; |
| case ENOSYS: |
| return "kernel does not support requested operation"; |
| } |
| if (err < 0) /* should always be */ |
| err = -err; |
| return strerror(err); |
| } |