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/*
** Copyright 2009, 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 "keystore.h"
static int do_list_certs(char **arg, char reply[REPLY_MAX])
{
return list_certs(reply);
}
static int do_list_userkeys(char **arg, char reply[REPLY_MAX])
{
return list_userkeys(reply);
}
static int do_install_cert(char **arg, char reply[REPLY_MAX])
{
return install_cert(arg[0]); /* move the certificate to keystore */
}
static int do_remove_cert(char **arg, char reply[REPLY_MAX])
{
return remove_cert(arg[0]); /* certificate */
}
static int do_install_userkey(char **arg, char reply[REPLY_MAX])
{
return install_userkey(arg[0]); /* move the certificate to keystore */
}
static int do_remove_userkey(char **arg, char reply[REPLY_MAX])
{
return remove_userkey(arg[0]); /* userkey */
}
struct cmdinfo {
const char *name;
unsigned numargs;
int (*func)(char **arg, char reply[REPLY_MAX]);
};
struct cmdinfo cmds[] = {
{ "listcerts", 0, do_list_certs },
{ "listuserkeys", 0, do_list_userkeys },
{ "installcert", 1, do_install_cert },
{ "removecert", 1, do_remove_cert },
{ "installuserkey", 1, do_install_userkey },
{ "removeuserkey", 1, do_remove_userkey },
};
static int readx(int s, void *_buf, int count)
{
char *buf = _buf;
int n = 0, r;
if (count < 0) return -1;
while (n < count) {
r = read(s, buf + n, count - n);
if (r < 0) {
if (errno == EINTR) continue;
LOGE("read error: %s\n", strerror(errno));
return -1;
}
if (r == 0) {
LOGE("eof\n");
return -1; /* EOF */
}
n += r;
}
return 0;
}
static int writex(int s, const void *_buf, int count)
{
const char *buf = _buf;
int n = 0, r;
if (count < 0) return -1;
while (n < count) {
r = write(s, buf + n, count - n);
if (r < 0) {
if (errno == EINTR) continue;
LOGE("write error: %s\n", strerror(errno));
return -1;
}
n += r;
}
return 0;
}
/* Tokenize the command buffer, locate a matching command,
* ensure that the required number of arguments are provided,
* call the function(), return the result.
*/
static int execute(int s, char cmd[BUFFER_MAX])
{
char reply[REPLY_MAX];
char *arg[TOKEN_MAX+1];
unsigned i;
unsigned n = 0;
unsigned short count;
int ret = -1;
/* default reply is "" */
reply[0] = 0;
/* n is number of args (not counting arg[0]) */
arg[0] = cmd;
while (*cmd) {
if (isspace(*cmd)) {
*cmd++ = 0;
n++;
arg[n] = cmd;
if (n == TOKEN_MAX) {
LOGE("too many arguments\n");
goto done;
}
}
cmd++;
}
for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
if (!strcmp(cmds[i].name,arg[0])) {
if (n != cmds[i].numargs) {
LOGE("%s requires %d arguments (%d given)\n",
cmds[i].name, cmds[i].numargs, n);
} else {
ret = cmds[i].func(arg + 1, reply);
}
goto done;
}
}
LOGE("unsupported command '%s'\n", arg[0]);
done:
if (reply[0]) {
n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
} else {
n = snprintf(cmd, BUFFER_MAX, "%d", ret);
}
if (n > BUFFER_MAX) n = BUFFER_MAX;
count = n;
if (writex(s, &count, sizeof(count))) return -1;
if (writex(s, cmd, count)) return -1;
return 0;
}
int shell_command(const int argc, const char **argv)
{
int fd, i, r;
unsigned short count;
char cmd[BUFFER_MAX]="";
fd = socket_local_client(SOCKET_PATH,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM);
if (fd == -1) {
fprintf(stderr, "Keystore service is not up and running\n");
exit(1);
}
for(i = 0; i < argc; i++) {
if (i > 0) strlcat(cmd, " ", BUFFER_MAX);
if(strlcat(cmd, argv[i], BUFFER_MAX) >= BUFFER_MAX) {
fprintf(stderr, "Arguments are too long\n");
exit(1);
}
}
count = strlen(cmd);
if (writex(fd, &count, sizeof(count))) return -1;
if (writex(fd, cmd, strlen(cmd))) return -1;
if (readx(fd, &count, sizeof(count))) return -1;
if (readx(fd, cmd, count)) return -1;
cmd[count]=0;
fprintf(stdout, "%s\n", cmd);
return 0;
}
int main(const int argc, const char *argv[])
{
char buf[BUFFER_MAX];
struct sockaddr addr;
socklen_t alen;
int lsocket, s, count;
if (argc > 1) {
return shell_command(argc - 1, argv + 1);
}
lsocket = android_get_control_socket(SOCKET_PATH);
if (lsocket < 0) {
LOGE("Failed to get socket from environment: %s\n", strerror(errno));
exit(1);
}
if (listen(lsocket, 5)) {
LOGE("Listen on socket failed: %s\n", strerror(errno));
exit(1);
}
fcntl(lsocket, F_SETFD, FD_CLOEXEC);
for (;;) {
alen = sizeof(addr);
s = accept(lsocket, &addr, &alen);
if (s < 0) {
LOGE("Accept failed: %s\n", strerror(errno));
continue;
}
fcntl(s, F_SETFD, FD_CLOEXEC);
LOGI("new connection\n");
for (;;) {
unsigned short count;
if (readx(s, &count, sizeof(count))) {
LOGE("failed to read size\n");
break;
}
if ((count < 1) || (count >= BUFFER_MAX)) {
LOGE("invalid size %d\n", count);
break;
}
if (readx(s, buf, count)) {
LOGE("failed to read command\n");
break;
}
buf[count] = 0;
if (execute(s, buf)) break;
}
LOGI("closing connection\n");
close(s);
}
return 0;
}
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