Magisk/jni/utils/misc.c
2017-04-22 17:12:54 +08:00

217 lines
4.5 KiB
C

/* misc.c - Store all functions that are unable to be catagorized clearly
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include "magisk.h"
#include "utils.h"
int quit_signals[] = { SIGALRM, SIGABRT, SIGHUP, SIGPIPE, SIGQUIT, SIGTERM, SIGINT, 0 };
unsigned get_shell_uid() {
struct passwd* ppwd = getpwnam("shell");
if (NULL == ppwd)
return 2000;
return ppwd->pw_uid;
}
unsigned get_system_uid() {
struct passwd* ppwd = getpwnam("system");
if (NULL == ppwd)
return 1000;
return ppwd->pw_uid;
}
unsigned get_radio_uid() {
struct passwd* ppwd = getpwnam("radio");
if (NULL == ppwd)
return 1001;
return ppwd->pw_uid;
}
int check_data() {
char buffer[4096];
FILE *fp = xfopen("/proc/mounts", "r");
while (fgets(buffer, sizeof(buffer), fp)) {
if (strstr(buffer, " /data ")) {
if (strstr(buffer, "tmpfs"))
return 0;
else
return 1;
}
}
return 0;
}
/* All the string should be freed manually!! */
void file_to_vector(struct vector *v, FILE *fp) {
char *line = NULL;
size_t len = 0;
ssize_t read;
while ((read = getline(&line, &len, fp)) != -1) {
// Remove end newline
if (line[read - 1] == '\n')
line[read - 1] = '\0';
vec_push_back(v, line);
line = NULL;
}
}
/* Check if the string only contains digits */
int isNum(const char *s) {
int len = strlen(s);
for (int i = 0; i < len; ++i)
if (s[i] < '0' || s[i] > '9')
return 0;
return 1;
}
/* Read a whole line from file descriptor */
ssize_t fdgets(char *buf, const size_t size, int fd) {
ssize_t read = 0;
buf[0] = '\0';
while (xread(fd, buf + read, 1) && read < size - 1) {
if (buf[read] == '\0' || buf[read++] == '\n') {
buf[read] = '\0';
break;
}
}
buf[size - 1] = '\0';
return read;
}
/* Call func for each process */
void ps(void (*func)(int)) {
DIR *dir;
struct dirent *entry;
dir = xopendir("/proc");
while ((entry = xreaddir(dir))) {
if (entry->d_type == DT_DIR) {
if (isNum(entry->d_name))
func(atoi(entry->d_name));
}
}
closedir(dir);
}
// Internal usage
static void (*ps_filter_cb)(int);
static const char *ps_filter_pattern;
static void proc_name_filter(int pid) {
char buf[64];
snprintf(buf, sizeof(buf), "/proc/%d/cmdline", pid);
int fd = xopen(buf, O_RDONLY);
if (fdgets(buf, sizeof(buf), fd) == 0) {
snprintf(buf, sizeof(buf), "/proc/%d/comm", pid);
close(fd);
fd = xopen(buf, O_RDONLY);
fdgets(buf, sizeof(buf), fd);
}
if (strstr(buf, ps_filter_pattern)) {
// printf("%d: %s\n", pid, buf);
ps_filter_cb(pid);
}
close(fd);
}
/* Call func with process name filtered with pattern */
void ps_filter_proc_name(const char *pattern, void (*func)(int)) {
ps_filter_cb = func;
ps_filter_pattern = ((pattern == NULL) ? "" : pattern);
ps(proc_name_filter);
}
int create_links(const char *bin, const char *path) {
char self[PATH_MAX], linkpath[PATH_MAX];
if (bin == NULL) {
xreadlink("/proc/self/exe", self, sizeof(self));
bin = self;
}
int ret = 0;
for (int i = 0; applet[i]; ++i) {
snprintf(linkpath, sizeof(linkpath), "%s/%s", path, applet[i]);
unlink(linkpath);
ret |= symlink(bin, linkpath);
}
return ret;
}
#define DEV_BLOCK "/dev/block"
void unlock_blocks() {
char path[PATH_MAX];
DIR *dir;
struct dirent *entry;
int fd, OFF = 0;
if (!(dir = xopendir(DEV_BLOCK)))
return;
while((entry = readdir(dir))) {
if (entry->d_type == DT_BLK && strstr(entry->d_name, "mmc") != NULL) {
snprintf(path, sizeof(path), "%s/%s", DEV_BLOCK, entry->d_name);
if ((fd = xopen(path, O_RDONLY)) < 0)
continue;
if (ioctl(fd, BLKROSET, &OFF) == -1)
PLOGE("unlock %s", path);
close(fd);
}
}
closedir(dir);
}
void unblock_boot_process() {
int fd = open("/dev/.magisk.unblock", O_RDONLY | O_CREAT);
close(fd);
}
void setup_sighandlers(void (*handler)(int)) {
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = handler;
for (int i = 0; quit_signals[i]; ++i) {
sigaction(quit_signals[i], &act, NULL);
}
}
int run_command(int *fd, const char *path, char *const argv[]) {
int sv[2];
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv) == -1)
return -1;
// We use sv[0], give them sv[1] for communication
*fd = sv[1];
int pid = fork();
if (pid != 0) {
close(sv[0]);
return pid;
}
close(sv[1]);
dup2(sv[0], STDIN_FILENO);
dup2(sv[0], STDOUT_FILENO);
dup2(sv[0], STDERR_FILENO);
execv(path, argv);
PLOGE("execv");
return -1;
}