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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
static std::vector<std::string> Glob(const std::string& pattern)
{
glob_t buf = {};
buf.gl_opendir = reinterpret_cast<void* (*)(const char* name)>(opendir);
buf.gl_closedir = reinterpret_cast<void (*)(void* dirp)>(closedir);
// Use own readdir to ignore links. Links to files are not useful to us,
// we will discover the target file itself. Links to directories are harmful
// because they cause recursion, or lead outside of the target glob
// (e.g. /proc/self/{root,cwd}).
// However, we want to keep few links: /proc/self, /proc/thread-self,
// /sys/kernel/slab/kmalloc-64 (may be a link with slab merging).
// This is a hacky way to do it b/c e.g. "self" will be matched in all paths,
// not just /proc. A proper fix would require writing completly custom version of glob
// that would support recursion and would allow using/not using links on demand.
buf.gl_readdir = [](void* dir) -> dirent* {
for (;;) {
struct dirent* ent = readdir(static_cast<DIR*>(dir));
if (!ent || ent->d_type != DT_LNK ||
!strcmp(ent->d_name, "self") ||
!strcmp(ent->d_name, "thread-self") ||
!strcmp(ent->d_name, "kmalloc-64"))
return ent;
}
},
buf.gl_stat = stat;
buf.gl_lstat = lstat;
int res = glob(pattern.c_str(), GLOB_MARK | GLOB_NOSORT | GLOB_ALTDIRFUNC, nullptr, &buf);
if (res != 0 && res != GLOB_NOMATCH)
failmsg("glob failed", "pattern='%s' res=%d", pattern.c_str(), res);
std::vector<std::string> files;
for (size_t i = 0; i < buf.gl_pathc; i++) {
const char* file = buf.gl_pathv[i];
if (file[strlen(file) - 1] == '/')
continue;
files.push_back(file);
}
globfree(&buf);
debug("glob %s resolved to %zu files\n", pattern.c_str(), files.size());
return files;
}
static std::unique_ptr<rpc::FileInfoRawT> ReadFile(const std::string& file)
{
auto info = std::make_unique<rpc::FileInfoRawT>();
info->name = file;
int fd = open(file.c_str(), O_RDONLY);
if (fd == -1) {
info->exists = errno != EEXIST && errno != ENOENT;
info->error = strerror(errno);
} else {
info->exists = true;
for (;;) {
constexpr size_t kChunk = 4 << 10;
info->data.resize(info->data.size() + kChunk);
ssize_t n = read(fd, info->data.data() + info->data.size() - kChunk, kChunk);
if (n < 0) {
info->error = strerror(errno);
break;
}
info->data.resize(info->data.size() - kChunk + n);
if (n == 0)
break;
}
close(fd);
}
debug("reading file %s: size=%zu exists=%d error=%s\n",
info->name.c_str(), info->data.size(), info->exists, info->error.c_str());
return info;
}
static std::string ReadTextFile(const char* file_fmt, ...)
{
char file[1024];
va_list args;
va_start(args, file_fmt);
vsnprintf(file, sizeof(file), file_fmt, args);
va_end(args);
file[sizeof(file) - 1] = 0;
auto data = ReadFile(file)->data;
std::string str(data.begin(), data.end());
while (!str.empty() && (str.back() == '\n' || str.back() == 0))
str.resize(str.size() - 1);
return str;
}
static std::vector<std::unique_ptr<rpc::FileInfoRawT>> ReadFiles(const std::vector<std::string>& files)
{
std::vector<std::unique_ptr<rpc::FileInfoRawT>> results;
for (const auto& file : files) {
if (!strchr(file.c_str(), '*')) {
results.push_back(ReadFile(file));
continue;
}
for (const auto& match : Glob(file))
results.push_back(ReadFile(match));
}
return results;
}
static std::vector<std::unique_ptr<rpc::GlobInfoRawT>> ReadGlobs(const std::vector<std::string>& patterns)
{
std::vector<std::unique_ptr<rpc::GlobInfoRawT>> results;
for (const auto& pattern : patterns) {
auto info = std::make_unique<rpc::GlobInfoRawT>();
info->name = pattern;
info->files = Glob(pattern);
results.push_back(std::move(info));
}
return results;
}
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