Magisk/native/jni/magiskboot/cpio.cpp

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#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
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#include <algorithm>
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#include "cpio.h"
#include "utils.h"
#include "logging.h"
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using namespace std;
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#define parse_align() lseek(fd, do_align(lseek(fd, 0, SEEK_CUR), 4), SEEK_SET)
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static uint32_t x8u(char *hex) {
uint32_t val, inpos = 8, outpos;
char pattern[6];
while (*hex == '0') {
hex++;
if (!--inpos) return 0;
}
// Because scanf gratuitously treats %*X differently than printf does.
sprintf(pattern, "%%%dx%%n", inpos);
sscanf(hex, pattern, &val, &outpos);
if (inpos != outpos)
LOGE("bad cpio header\n");
return val;
}
cpio_entry::cpio_entry(int fd, cpio_newc_header &header) {
// ino = x8u(header.ino);
mode = x8u(header.mode);
uid = x8u(header.uid);
gid = x8u(header.gid);
// nlink = x8u(header.nlink);
// mtime = x8u(header.mtime);
filesize = x8u(header.filesize);
// devmajor = x8u(header.devmajor);
// devminor = x8u(header.devminor);
// rdevmajor = x8u(header.rdevmajor);
// rdevminor = x8u(header.rdevminor);
uint32_t namesize = x8u(header.namesize);
// check = x8u(header.check);
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filename.resize(namesize - 1);
xxread(fd, &filename[0], namesize);
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parse_align();
if (filesize) {
data = xmalloc(filesize);
xxread(fd, data, filesize);
parse_align();
}
}
cpio_entry::~cpio_entry() {
free(data);
}
cpio::cpio(const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) return;
fprintf(stderr, "Loading cpio: [%s]\n", filename);
cpio_newc_header header;
cpio_entry *entry;
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int i = 0;
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while(xxread(fd, &header, sizeof(cpio_newc_header)) != -1) {
entry = new cpio_entry(fd, header);
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if (entry->filename == "." || entry->filename == ".." || entry->filename == "TRAILER!!!") {
bool trailer = entry->filename[0] == 'T';
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delete entry;
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if (trailer)
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break;
continue;
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}
arr.push_back(entry);
}
close(fd);
}
cpio::~cpio() {
for (auto &e : arr)
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delete e;
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}
#define dump_align() write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR), 4))
void cpio::dump(const char *file) {
fprintf(stderr, "Dump cpio: [%s]\n", file);
unsigned inode = 300000;
char header[111];
sort();
int fd = creat(file, 0644);
for (auto &e : arr) {
sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x",
inode++, // e->ino
e->mode,
e->uid,
e->gid,
1, // e->nlink
0, // e->mtime
e->filesize,
0, // e->devmajor
0, // e->devminor
0, // e->rdevmajor
0, // e->rdevminor
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(uint32_t) e->filename.size() + 1,
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0 // e->check
);
xwrite(fd, header, 110);
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xwrite(fd, e->filename.c_str(), e->filename.size() + 1);
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dump_align();
if (e->filesize) {
xwrite(fd, e->data, e->filesize);
dump_align();
}
}
// Write trailer
sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x",
inode++, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 11, 0);
xwrite(fd, header, 110);
xwrite(fd, "TRAILER!!!\0", 11);
dump_align();
close(fd);
}
int cpio::find(const char *name) {
for (int i = 0; i < arr.size(); ++i) {
if (!arr[i])
continue;
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if (arr[i]->filename == name)
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return i;
}
return -1;
}
void cpio::insert(cpio_entry *e) {
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int i = find(e->filename.c_str());
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if (i >= 0) {
delete arr[i];
arr[i] = e;
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} else {
arr.push_back(e);
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}
}
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void cpio::rm(const char *name, bool r) {
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size_t len = strlen(name);
for (auto &e : arr) {
if (!e)
continue;
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if (e->filename.compare(0, len, name) == 0 &&
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((r && e->filename[len] == '/') || e->filename[len] == '\0')) {
fprintf(stderr, "Remove [%s]\n", e->filename.c_str());
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delete e;
e = nullptr;
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if (!r)
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return;
}
}
}
void cpio::makedir(mode_t mode, const char *name) {
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auto e = new cpio_entry(name);
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e->mode = S_IFDIR | mode;
insert(e);
fprintf(stderr, "Create directory [%s] (%04o)\n", name, mode);
}
void cpio::ln(const char *target, const char *name) {
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auto e = new cpio_entry(name);
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e->mode = S_IFLNK;
e->filesize = strlen(target);
e->data = strdup(target);
insert(e);
fprintf(stderr, "Create symlink [%s] -> [%s]\n", name, target);
}
void cpio::add(mode_t mode, const char *name, const char *file) {
int fd = xopen(file, O_RDONLY);
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auto e = new cpio_entry(name);
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e->mode = S_IFREG | mode;
e->filesize = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
e->data = xmalloc(e->filesize);
xxread(fd, e->data, e->filesize);
close(fd);
insert(e);
fprintf(stderr, "Add entry [%s] (%04o)\n", name, mode);
}
bool cpio::mv(const char *from, const char *to) {
int f = find(from), t = find(to);
if (f >= 0) {
if (t > 0) {
delete arr[t];
arr[t] = nullptr;
}
fprintf(stderr, "Move [%s] -> [%s]\n", from, to);
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arr[f]->filename = to;
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return true;
}
fprintf(stderr, "Cannot find entry %s\n", from);
return false;
}
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static void extract_entry(cpio_entry *e, const char *file) {
fprintf(stderr, "Extract [%s] to [%s]\n", e->filename.c_str(), file);
unlink(file);
rmdir(file);
if (S_ISDIR(e->mode)) {
mkdir(file, e->mode & 0777);
} else if (S_ISREG(e->mode)) {
int fd = creat(file, e->mode & 0777);
xwrite(fd, e->data, e->filesize);
fchown(fd, e->uid, e->gid);
close(fd);
} else if (S_ISLNK(e->mode)) {
auto target = new char[e->filesize + 1];
memcpy(target, e->data, e->filesize);
target[e->filesize] = '\0';
symlink(target, file);
delete[] target;
}
}
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void cpio::extract() {
for (auto &e : arr) {
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if (!e) continue;
extract_entry(e, e->filename.c_str());
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}
}
bool cpio::extract(const char *name, const char *file) {
int i = find(name);
if (i > 0) {
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extract_entry(arr[i], file);
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return true;
}
fprintf(stderr, "Cannot find the file entry [%s]\n", name);
return false;
}
void cpio::sort() {
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std::sort(arr.begin(), arr.end(), [] (auto a, auto b) -> bool {
if (a == b || a == nullptr)
return false;
if (b == nullptr)
return true;
return a->filename.compare(b->filename) < 0;
});
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while (arr.back() == nullptr)
arr.pop_back();
}