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platform_system_core/init/builtins.c
James Morrissey 381341f5f7 Fix environment variable assignment in init 
The init process allows environment variables to be specified in
the rc script globally, via 'export', and for a specific process,
via the 'setenv' option.

However, the mechanism for assembling the environment simply
appended the new variable without checking whether it was already
defined, so it was not possible to overwrite an existing entry.
This patch fixes that behaviour.

Limitations and concerns:

The limit of a maximum number of 31 variables is unchanged.

Currently, most callers of "add_environment" do not check the return
value, but the function now logs the failure rather than failing
silently.

Change-Id: Ie9a68c37a0f55c5b40e904e695cd35514f67f480
2014-07-10 11:22:46 -07:00

908 lines
19 KiB
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <linux/kd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <linux/loop.h>
#include <cutils/partition_utils.h>
#include <cutils/android_reboot.h>
#include <fs_mgr.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include "init.h"
#include "keywords.h"
#include "property_service.h"
#include "devices.h"
#include "init_parser.h"
#include "util.h"
#include "log.h"
#include <private/android_filesystem_config.h>
int add_environment(const char *name, const char *value);
extern int init_module(void *, unsigned long, const char *);
static int write_file(const char *path, const char *value)
{
int fd, ret, len;
fd = open(path, O_WRONLY|O_CREAT|O_NOFOLLOW, 0600);
if (fd < 0)
return -errno;
len = strlen(value);
do {
ret = write(fd, value, len);
} while (ret < 0 && errno == EINTR);
close(fd);
if (ret < 0) {
return -errno;
} else {
return 0;
}
}
static int _open(const char *path)
{
int fd;
fd = open(path, O_RDONLY | O_NOFOLLOW);
if (fd < 0)
fd = open(path, O_WRONLY | O_NOFOLLOW);
return fd;
}
static int _chown(const char *path, unsigned int uid, unsigned int gid)
{
int fd;
int ret;
fd = _open(path);
if (fd < 0) {
return -1;
}
ret = fchown(fd, uid, gid);
if (ret < 0) {
int errno_copy = errno;
close(fd);
errno = errno_copy;
return -1;
}
close(fd);
return 0;
}
static int _chmod(const char *path, mode_t mode)
{
int fd;
int ret;
fd = _open(path);
if (fd < 0) {
return -1;
}
ret = fchmod(fd, mode);
if (ret < 0) {
int errno_copy = errno;
close(fd);
errno = errno_copy;
return -1;
}
close(fd);
return 0;
}
static int insmod(const char *filename, char *options)
{
void *module;
unsigned size;
int ret;
module = read_file(filename, &size);
if (!module)
return -1;
ret = init_module(module, size, options);
free(module);
return ret;
}
static int setkey(struct kbentry *kbe)
{
int fd, ret;
fd = open("/dev/tty0", O_RDWR | O_SYNC);
if (fd < 0)
return -1;
ret = ioctl(fd, KDSKBENT, kbe);
close(fd);
return ret;
}
static int __ifupdown(const char *interface, int up)
{
struct ifreq ifr;
int s, ret;
strlcpy(ifr.ifr_name, interface, IFNAMSIZ);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
return -1;
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
if (ret < 0) {
goto done;
}
if (up)
ifr.ifr_flags |= IFF_UP;
else
ifr.ifr_flags &= ~IFF_UP;
ret = ioctl(s, SIOCSIFFLAGS, &ifr);
done:
close(s);
return ret;
}
static void service_start_if_not_disabled(struct service *svc)
{
if (!(svc->flags & SVC_DISABLED)) {
service_start(svc, NULL);
} else {
svc->flags |= SVC_DISABLED_START;
}
}
int do_chdir(int nargs, char **args)
{
chdir(args[1]);
return 0;
}
int do_chroot(int nargs, char **args)
{
chroot(args[1]);
return 0;
}
int do_class_start(int nargs, char **args)
{
/* Starting a class does not start services
* which are explicitly disabled. They must
* be started individually.
*/
service_for_each_class(args[1], service_start_if_not_disabled);
return 0;
}
int do_class_stop(int nargs, char **args)
{
service_for_each_class(args[1], service_stop);
return 0;
}
int do_class_reset(int nargs, char **args)
{
service_for_each_class(args[1], service_reset);
return 0;
}
int do_domainname(int nargs, char **args)
{
return write_file("/proc/sys/kernel/domainname", args[1]);
}
int do_enable(int nargs, char **args)
{
struct service *svc;
svc = service_find_by_name(args[1]);
if (svc) {
svc->flags &= ~(SVC_DISABLED | SVC_RC_DISABLED);
if (svc->flags & SVC_DISABLED_START) {
service_start(svc, NULL);
}
} else {
return -1;
}
return 0;
}
int do_exec(int nargs, char **args)
{
return -1;
}
int do_export(int nargs, char **args)
{
return add_environment(args[1], args[2]);
}
int do_hostname(int nargs, char **args)
{
return write_file("/proc/sys/kernel/hostname", args[1]);
}
int do_ifup(int nargs, char **args)
{
return __ifupdown(args[1], 1);
}
static int do_insmod_inner(int nargs, char **args, int opt_len)
{
char options[opt_len + 1];
int i;
options[0] = '\0';
if (nargs > 2) {
strcpy(options, args[2]);
for (i = 3; i < nargs; ++i) {
strcat(options, " ");
strcat(options, args[i]);
}
}
return insmod(args[1], options);
}
int do_insmod(int nargs, char **args)
{
int i;
int size = 0;
if (nargs > 2) {
for (i = 2; i < nargs; ++i)
size += strlen(args[i]) + 1;
}
return do_insmod_inner(nargs, args, size);
}
int do_mkdir(int nargs, char **args)
{
mode_t mode = 0755;
int ret;
/* mkdir <path> [mode] [owner] [group] */
if (nargs >= 3) {
mode = strtoul(args[2], 0, 8);
}
ret = make_dir(args[1], mode);
/* chmod in case the directory already exists */
if (ret == -1 && errno == EEXIST) {
ret = _chmod(args[1], mode);
}
if (ret == -1) {
return -errno;
}
if (nargs >= 4) {
uid_t uid = decode_uid(args[3]);
gid_t gid = -1;
if (nargs == 5) {
gid = decode_uid(args[4]);
}
if (_chown(args[1], uid, gid) < 0) {
return -errno;
}
/* chown may have cleared S_ISUID and S_ISGID, chmod again */
if (mode & (S_ISUID | S_ISGID)) {
ret = _chmod(args[1], mode);
if (ret == -1) {
return -errno;
}
}
}
return 0;
}
static struct {
const char *name;
unsigned flag;
} mount_flags[] = {
{ "noatime", MS_NOATIME },
{ "noexec", MS_NOEXEC },
{ "nosuid", MS_NOSUID },
{ "nodev", MS_NODEV },
{ "nodiratime", MS_NODIRATIME },
{ "ro", MS_RDONLY },
{ "rw", 0 },
{ "remount", MS_REMOUNT },
{ "bind", MS_BIND },
{ "rec", MS_REC },
{ "unbindable", MS_UNBINDABLE },
{ "private", MS_PRIVATE },
{ "slave", MS_SLAVE },
{ "shared", MS_SHARED },
{ "defaults", 0 },
{ 0, 0 },
};
#define DATA_MNT_POINT "/data"
/* mount <type> <device> <path> <flags ...> <options> */
int do_mount(int nargs, char **args)
{
char tmp[64];
char *source, *target, *system;
char *options = NULL;
unsigned flags = 0;
int n, i;
int wait = 0;
for (n = 4; n < nargs; n++) {
for (i = 0; mount_flags[i].name; i++) {
if (!strcmp(args[n], mount_flags[i].name)) {
flags |= mount_flags[i].flag;
break;
}
}
if (!mount_flags[i].name) {
if (!strcmp(args[n], "wait"))
wait = 1;
/* if our last argument isn't a flag, wolf it up as an option string */
else if (n + 1 == nargs)
options = args[n];
}
}
system = args[1];
source = args[2];
target = args[3];
if (!strncmp(source, "mtd@", 4)) {
n = mtd_name_to_number(source + 4);
if (n < 0) {
return -1;
}
sprintf(tmp, "/dev/block/mtdblock%d", n);
if (wait)
wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
if (mount(tmp, target, system, flags, options) < 0) {
return -1;
}
goto exit_success;
} else if (!strncmp(source, "loop@", 5)) {
int mode, loop, fd;
struct loop_info info;
mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
fd = open(source + 5, mode);
if (fd < 0) {
return -1;
}
for (n = 0; ; n++) {
sprintf(tmp, "/dev/block/loop%d", n);
loop = open(tmp, mode);
if (loop < 0) {
return -1;
}
/* if it is a blank loop device */
if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
/* if it becomes our loop device */
if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
close(fd);
if (mount(tmp, target, system, flags, options) < 0) {
ioctl(loop, LOOP_CLR_FD, 0);
close(loop);
return -1;
}
close(loop);
goto exit_success;
}
}
close(loop);
}
close(fd);
ERROR("out of loopback devices");
return -1;
} else {
if (wait)
wait_for_file(source, COMMAND_RETRY_TIMEOUT);
if (mount(source, target, system, flags, options) < 0) {
return -1;
}
}
exit_success:
return 0;
}
int do_mount_all(int nargs, char **args)
{
pid_t pid;
int ret = -1;
int child_ret = -1;
int status;
const char *prop;
struct fstab *fstab;
if (nargs != 2) {
return -1;
}
/*
* Call fs_mgr_mount_all() to mount all filesystems. We fork(2) and
* do the call in the child to provide protection to the main init
* process if anything goes wrong (crash or memory leak), and wait for
* the child to finish in the parent.
*/
pid = fork();
if (pid > 0) {
/* Parent. Wait for the child to return */
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
} else {
ret = -1;
}
} else if (pid == 0) {
/* child, call fs_mgr_mount_all() */
klog_set_level(6); /* So we can see what fs_mgr_mount_all() does */
fstab = fs_mgr_read_fstab(args[1]);
child_ret = fs_mgr_mount_all(fstab);
fs_mgr_free_fstab(fstab);
if (child_ret == -1) {
ERROR("fs_mgr_mount_all returned an error\n");
}
exit(child_ret);
} else {
/* fork failed, return an error */
return -1;
}
/* ret is 1 if the device is encrypted, 0 if not, and -1 on error */
if (ret == 1) {
property_set("ro.crypto.state", "encrypted");
property_set("vold.decrypt", "1");
} else if (ret == 0) {
property_set("ro.crypto.state", "unencrypted");
/* If fs_mgr determined this is an unencrypted device, then trigger
* that action.
*/
action_for_each_trigger("nonencrypted", action_add_queue_tail);
}
return ret;
}
int do_swapon_all(int nargs, char **args)
{
struct fstab *fstab;
int ret;
fstab = fs_mgr_read_fstab(args[1]);
ret = fs_mgr_swapon_all(fstab);
fs_mgr_free_fstab(fstab);
return ret;
}
int do_setcon(int nargs, char **args) {
if (is_selinux_enabled() <= 0)
return 0;
if (setcon(args[1]) < 0) {
return -errno;
}
return 0;
}
int do_setenforce(int nargs, char **args) {
if (is_selinux_enabled() <= 0)
return 0;
if (security_setenforce(atoi(args[1])) < 0) {
return -errno;
}
return 0;
}
int do_setkey(int nargs, char **args)
{
struct kbentry kbe;
kbe.kb_table = strtoul(args[1], 0, 0);
kbe.kb_index = strtoul(args[2], 0, 0);
kbe.kb_value = strtoul(args[3], 0, 0);
return setkey(&kbe);
}
int do_setprop(int nargs, char **args)
{
const char *name = args[1];
const char *value = args[2];
char prop_val[PROP_VALUE_MAX];
int ret;
ret = expand_props(prop_val, value, sizeof(prop_val));
if (ret) {
ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
return -EINVAL;
}
property_set(name, prop_val);
return 0;
}
int do_setrlimit(int nargs, char **args)
{
struct rlimit limit;
int resource;
resource = atoi(args[1]);
limit.rlim_cur = atoi(args[2]);
limit.rlim_max = atoi(args[3]);
return setrlimit(resource, &limit);
}
int do_start(int nargs, char **args)
{
struct service *svc;
svc = service_find_by_name(args[1]);
if (svc) {
service_start(svc, NULL);
}
return 0;
}
int do_stop(int nargs, char **args)
{
struct service *svc;
svc = service_find_by_name(args[1]);
if (svc) {
service_stop(svc);
}
return 0;
}
int do_restart(int nargs, char **args)
{
struct service *svc;
svc = service_find_by_name(args[1]);
if (svc) {
service_restart(svc);
}
return 0;
}
int do_powerctl(int nargs, char **args)
{
char command[PROP_VALUE_MAX];
int res;
int len = 0;
int cmd = 0;
char *reboot_target;
res = expand_props(command, args[1], sizeof(command));
if (res) {
ERROR("powerctl: cannot expand '%s'\n", args[1]);
return -EINVAL;
}
if (strncmp(command, "shutdown", 8) == 0) {
cmd = ANDROID_RB_POWEROFF;
len = 8;
} else if (strncmp(command, "reboot", 6) == 0) {
cmd = ANDROID_RB_RESTART2;
len = 6;
} else {
ERROR("powerctl: unrecognized command '%s'\n", command);
return -EINVAL;
}
if (command[len] == ',') {
reboot_target = &command[len + 1];
} else if (command[len] == '\0') {
reboot_target = "";
} else {
ERROR("powerctl: unrecognized reboot target '%s'\n", &command[len]);
return -EINVAL;
}
return android_reboot(cmd, 0, reboot_target);
}
int do_trigger(int nargs, char **args)
{
action_for_each_trigger(args[1], action_add_queue_tail);
return 0;
}
int do_symlink(int nargs, char **args)
{
return symlink(args[1], args[2]);
}
int do_rm(int nargs, char **args)
{
return unlink(args[1]);
}
int do_rmdir(int nargs, char **args)
{
return rmdir(args[1]);
}
int do_sysclktz(int nargs, char **args)
{
struct timezone tz;
if (nargs != 2)
return -1;
memset(&tz, 0, sizeof(tz));
tz.tz_minuteswest = atoi(args[1]);
if (settimeofday(NULL, &tz))
return -1;
return 0;
}
int do_write(int nargs, char **args)
{
const char *path = args[1];
const char *value = args[2];
char prop_val[PROP_VALUE_MAX];
int ret;
ret = expand_props(prop_val, value, sizeof(prop_val));
if (ret) {
ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
return -EINVAL;
}
return write_file(path, prop_val);
}
int do_copy(int nargs, char **args)
{
char *buffer = NULL;
int rc = 0;
int fd1 = -1, fd2 = -1;
struct stat info;
int brtw, brtr;
char *p;
if (nargs != 3)
return -1;
if (stat(args[1], &info) < 0)
return -1;
if ((fd1 = open(args[1], O_RDONLY)) < 0)
goto out_err;
if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0)
goto out_err;
if (!(buffer = malloc(info.st_size)))
goto out_err;
p = buffer;
brtr = info.st_size;
while(brtr) {
rc = read(fd1, p, brtr);
if (rc < 0)
goto out_err;
if (rc == 0)
break;
p += rc;
brtr -= rc;
}
p = buffer;
brtw = info.st_size;
while(brtw) {
rc = write(fd2, p, brtw);
if (rc < 0)
goto out_err;
if (rc == 0)
break;
p += rc;
brtw -= rc;
}
rc = 0;
goto out;
out_err:
rc = -1;
out:
if (buffer)
free(buffer);
if (fd1 >= 0)
close(fd1);
if (fd2 >= 0)
close(fd2);
return rc;
}
int do_chown(int nargs, char **args) {
/* GID is optional. */
if (nargs == 3) {
if (_chown(args[2], decode_uid(args[1]), -1) < 0)
return -errno;
} else if (nargs == 4) {
if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0)
return -errno;
} else {
return -1;
}
return 0;
}
static mode_t get_mode(const char *s) {
mode_t mode = 0;
while (*s) {
if (*s >= '0' && *s <= '7') {
mode = (mode<<3) | (*s-'0');
} else {
return -1;
}
s++;
}
return mode;
}
int do_chmod(int nargs, char **args) {
mode_t mode = get_mode(args[1]);
if (_chmod(args[2], mode) < 0) {
return -errno;
}
return 0;
}
int do_restorecon(int nargs, char **args) {
int i;
int ret = 0;
for (i = 1; i < nargs; i++) {
if (restorecon(args[i]) < 0)
ret = -errno;
}
return ret;
}
int do_restorecon_recursive(int nargs, char **args) {
int i;
int ret = 0;
for (i = 1; i < nargs; i++) {
if (restorecon_recursive(args[i]) < 0)
ret = -errno;
}
return ret;
}
int do_setsebool(int nargs, char **args) {
const char *name = args[1];
const char *value = args[2];
SELboolean b;
int ret;
if (is_selinux_enabled() <= 0)
return 0;
b.name = name;
if (!strcmp(value, "1") || !strcasecmp(value, "true") || !strcasecmp(value, "on"))
b.value = 1;
else if (!strcmp(value, "0") || !strcasecmp(value, "false") || !strcasecmp(value, "off"))
b.value = 0;
else {
ERROR("setsebool: invalid value %s\n", value);
return -EINVAL;
}
if (security_set_boolean_list(1, &b, 0) < 0) {
ret = -errno;
ERROR("setsebool: could not set %s to %s\n", name, value);
return ret;
}
return 0;
}
int do_loglevel(int nargs, char **args) {
int log_level;
char log_level_str[PROP_VALUE_MAX] = "";
if (nargs != 2) {
ERROR("loglevel: missing argument\n");
return -EINVAL;
}
if (expand_props(log_level_str, args[1], sizeof(log_level_str))) {
ERROR("loglevel: cannot expand '%s'\n", args[1]);
return -EINVAL;
}
log_level = atoi(log_level_str);
if (log_level < KLOG_ERROR_LEVEL || log_level > KLOG_DEBUG_LEVEL) {
ERROR("loglevel: invalid log level'%d'\n", log_level);
return -EINVAL;
}
klog_set_level(log_level);
return 0;
}
int do_load_persist_props(int nargs, char **args) {
if (nargs == 1) {
load_persist_props();
return 0;
}
return -1;
}
int do_load_all_props(int nargs, char **args) {
if (nargs == 1) {
load_all_props();
return 0;
}
return -1;
}
int do_wait(int nargs, char **args)
{
if (nargs == 2) {
return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
} else if (nargs == 3) {
return wait_for_file(args[1], atoi(args[2]));
} else
return -1;
}
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