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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2019 Alexey Gladkov <gladkov.alexey@gmail.com>
* Copyright (C) 2024 Tobias Stöckmann <tobias@stoeckmann.org>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <shared/strbuf.h>
#include <shared/util.h>
#include "libkmod.h"
#include "libkmod-internal.h"
#define MODULES_BUILTIN_MODINFO "modules.builtin.modinfo"
struct kmod_builtin_info {
struct kmod_ctx *ctx;
// The file handle.
FILE *fp;
// Internal buffer and its size. Used by getdelim.
size_t bufsz;
char *buf;
};
static bool kmod_builtin_info_init(struct kmod_builtin_info *info, struct kmod_ctx *ctx)
{
char path[PATH_MAX];
FILE *fp = NULL;
const char *dirname = kmod_get_dirname(ctx);
size_t len = strlen(dirname);
if ((len + 1 + strlen(MODULES_BUILTIN_MODINFO) + 1) >= PATH_MAX) {
errno = ENAMETOOLONG;
return false;
}
snprintf(path, PATH_MAX, "%s/" MODULES_BUILTIN_MODINFO, dirname);
fp = fopen(path, "r");
if (fp == NULL)
return false;
info->ctx = ctx;
info->fp = fp;
info->bufsz = 0;
info->buf = NULL;
return true;
}
static void kmod_builtin_info_release(struct kmod_builtin_info *info)
{
free(info->buf);
fclose(info->fp);
}
static ssize_t get_string(struct kmod_builtin_info *info)
{
ssize_t len;
len = getdelim(&info->buf, &info->bufsz, '\0', info->fp);
if (len > 0 && info->buf[len] != '\0') {
errno = EINVAL;
len = -1;
}
return len;
}
static ssize_t get_strings(struct kmod_builtin_info *info, const char *modname,
struct strbuf *buf)
{
const size_t modlen = strlen(modname);
ssize_t count, n;
for (count = 0; count < INTPTR_MAX;) {
char *dot, *line;
n = get_string(info);
if (n == -1) {
if (!feof(info->fp)) {
count = -errno;
ERR(info->ctx, "get_string: %s\n", strerror(errno));
}
break;
}
line = info->buf;
dot = strchr(line, '.');
if (dot == NULL) {
count = -EINVAL;
ERR(info->ctx, "get_strings: "
"unexpected string without modname prefix\n");
return count;
}
if (strncmp(line, modname, modlen) || line[modlen] != '.') {
/*
* If no string matched modname yet, keep searching.
* Otherwise this indicates that no further string will
* match again.
*/
if (count == 0)
continue;
break;
}
if (!strbuf_pushchars(buf, dot + 1) || !strbuf_pushchar(buf, '\0')) {
count = -errno;
ERR(info->ctx, "get_strings: "
"failed to append modinfo string\n");
return count;
}
count++;
}
if (count == INTPTR_MAX) {
count = -ENOMEM;
ERR(info->ctx, "get_strings: "
"too many modinfo strings encountered\n");
return count;
}
return count;
}
static char **strbuf_to_vector(struct strbuf *buf, size_t count)
{
size_t vec_size, total_size;
char **vector;
char *s;
size_t n;
/* (string vector + NULL) * sizeof(char *) + strbuf_used() */
if (uaddsz_overflow(count, 1, &n) ||
umulsz_overflow(sizeof(char *), n, &vec_size) ||
uaddsz_overflow(strbuf_used(buf), vec_size, &total_size)) {
errno = ENOMEM;
return NULL;
}
vector = realloc(buf->bytes, total_size);
if (vector == NULL)
return NULL;
memmove(vector + count + 1, vector, strbuf_used(buf));
s = (char *)(vector + count + 1);
strbuf_init(buf);
for (n = 0; n < count; n++) {
vector[n] = s;
s += strlen(s) + 1;
}
vector[n] = NULL;
return vector;
}
/* array will be allocated with strings in a single malloc, just free *array */
ssize_t kmod_builtin_get_modinfo(struct kmod_ctx *ctx, const char *modname,
char ***modinfo)
{
DECLARE_STRBUF(buf);
struct kmod_builtin_info info;
ssize_t count;
if (!kmod_builtin_info_init(&info, ctx))
return -errno;
count = get_strings(&info, modname, &buf);
if (count == 0)
*modinfo = NULL;
else if (count > 0) {
*modinfo = strbuf_to_vector(&buf, (size_t)count);
if (*modinfo == NULL) {
count = -errno;
ERR(ctx, "strbuf_to_vector: %s\n", strerror(errno));
}
}
kmod_builtin_info_release(&info);
return count;
}
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