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Add getgrgid_r/getgrnam_r.

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Bug: 22568551
Change-Id: I3c0772d119d6041063c6be53f5bcc5ea1768f0d5
This commit is contained in:
Yabin Cui 2015-07-20 19:46:26 -07:00
parent e70d7a78f0
commit c4786d366b
3 changed files with 142 additions and 13 deletions
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59
libc/bionic/stubs.cpp
View file

@ -39,6 +39,7 @@
#include <unistd.h>
#include "private/android_filesystem_config.h"
#include "private/bionic_macros.h"
#include "private/ErrnoRestorer.h"
#include "private/libc_logging.h"
#include "private/ThreadLocalBuffer.h"
@ -66,11 +67,15 @@ struct passwd_state_t {
static ThreadLocalBuffer<group_state_t> g_group_tls_buffer;
static ThreadLocalBuffer<passwd_state_t> g_passwd_tls_buffer;
static void init_group_state(group_state_t* state) {
memset(state, 0, sizeof(group_state_t));
state->group_.gr_mem = state->group_members_;
}
static group_state_t* __group_state() {
group_state_t* result = g_group_tls_buffer.get();
if (result != nullptr) {
memset(result, 0, sizeof(group_state_t));
result->group_.gr_mem = result->group_members_;
init_group_state(result);
}
return result;
}
@ -397,17 +402,28 @@ char* getlogin() { // NOLINT: implementing bad function.
return (pw != NULL) ? pw->pw_name : NULL;
}
static group* getgrgid_internal(gid_t gid, group_state_t* state) {
group* grp = android_id_to_group(state, gid);
if (grp != NULL) {
return grp;
}
return app_id_to_group(gid, state);
}
group* getgrgid(gid_t gid) { // NOLINT: implementing bad function.
group_state_t* state = __group_state();
if (state == NULL) {
return NULL;
}
return getgrgid_internal(gid, state);
}
group* gr = android_id_to_group(state, gid);
if (gr != NULL) {
return gr;
static group* getgrnam_internal(const char* name, group_state_t* state) {
group* grp = android_name_to_group(state, name);
if (grp != NULL) {
return grp;
}
return app_id_to_group(gid, state);
return app_id_to_group(app_id_from_name(name, true), state);
}
group* getgrnam(const char* name) { // NOLINT: implementing bad function.
@ -415,11 +431,36 @@ group* getgrnam(const char* name) { // NOLINT: implementing bad function.
if (state == NULL) {
return NULL;
}
return getgrnam_internal(name, state);
}
if (android_name_to_group(state, name) != 0) {
return &state->group_;
static int getgroup_r(bool by_name, const char* name, gid_t gid, struct group* grp, char* buf,
size_t buflen, struct group** result) {
ErrnoRestorer errno_restorer;
*result = NULL;
char* p = reinterpret_cast<char*>(
BIONIC_ALIGN(reinterpret_cast<uintptr_t>(buf), sizeof(uintptr_t)));
if (p + sizeof(group_state_t) > buf + buflen) {
return ERANGE;
}
return app_id_to_group(app_id_from_name(name, true), state);
group_state_t* state = reinterpret_cast<group_state_t*>(p);
init_group_state(state);
group* retval = (by_name ? getgrnam_internal(name, state) : getgrgid_internal(gid, state));
if (retval != NULL) {
*grp = *retval;
*result = grp;
return 0;
}
return errno;
}
int getgrgid_r(gid_t gid, struct group* grp, char* buf, size_t buflen, struct group** result) {
return getgroup_r(false, NULL, gid, grp, buf, buflen, result);
}
int getgrnam_r(const char* name, struct group* grp, char* buf, size_t buflen,
struct group **result) {
return getgroup_r(true, name, 0, grp, buf, buflen, result);
}
// We don't have an /etc/networks, so all inputs return NULL.

8
libc/libc.map
View file

@ -1332,6 +1332,12 @@ LIBC {
*;
};
LIBC_N {
global:
getgrgid_r;
getgrnam_r;
} LIBC;
LIBC_PRIVATE {
global:
___Unwind_Backtrace; # arm
@ -1453,4 +1459,4 @@ LIBC_PRIVATE {
SHA1Init; # arm x86 mips
SHA1Transform; # arm x86 mips
SHA1Update; # arm x86 mips
} LIBC;
} LIBC_N;

88
tests/stubs_test.cpp
View file

@ -163,8 +163,6 @@ TEST(getpwnam, app_id_u1_i0) {
check_get_passwd("u1_i0", 199000, TYPE_APP);
}
#if defined(__BIONIC__)
static void check_group(const group* grp, const char* group_name, gid_t gid) {
ASSERT_TRUE(grp != NULL);
ASSERT_STREQ(group_name, grp->gr_name);
@ -174,6 +172,8 @@ static void check_group(const group* grp, const char* group_name, gid_t gid) {
ASSERT_TRUE(grp->gr_mem[1] == NULL);
}
#if defined(__BIONIC__)
static void check_getgrgid(const char* group_name, gid_t gid) {
errno = 0;
group* grp = getgrgid(gid);
@ -190,17 +190,49 @@ static void check_getgrnam(const char* group_name, gid_t gid) {
check_group(grp, group_name, gid);
}
static void check_getgrgid_r(const char* group_name, gid_t gid) {
group grp_storage;
char buf[512];
group* grp;
errno = 0;
int result = getgrgid_r(gid, &grp_storage, buf, sizeof(buf), &grp);
ASSERT_EQ(0, result);
ASSERT_EQ(0, errno);
SCOPED_TRACE("getgrgid_r");
check_group(grp, group_name, gid);
}
static void check_getgrnam_r(const char* group_name, gid_t gid) {
group grp_storage;
char buf[512];
group* grp;
errno = 0;
int result = getgrnam_r(group_name, &grp_storage, buf, sizeof(buf), &grp);
ASSERT_EQ(0, result);
ASSERT_EQ(0, errno);
SCOPED_TRACE("getgrnam_r");
check_group(grp, group_name, gid);
}
static void check_get_group(const char* group_name, gid_t gid) {
check_getgrgid(group_name, gid);
check_getgrnam(group_name, gid);
check_getgrgid_r(group_name, gid);
check_getgrnam_r(group_name, gid);
}
#else // !defined(__BIONIC__)
static void check_get_group(const char* /* group_name */, gid_t /* gid */) {
static void print_no_getgrnam_test_info() {
GTEST_LOG_(INFO) << "This test is about gid/group_name translation for Android, which does nothing on libc other than bionic.\n";
}
static void check_get_group(const char*, gid_t) {
print_no_getgrnam_test_info();
}
#endif
TEST(getgrnam, system_id_root) {
@ -259,3 +291,53 @@ TEST(getgrnam, app_id_u1_a40000) {
TEST(getgrnam, app_id_u1_i0) {
check_get_group("u1_i0", 199000);
}
TEST(getgrnam_r, reentrancy) {
#if defined(__BIONIC__)
group grp_storage[2];
char buf[2][512];
group* grp[3];
int result = getgrnam_r("root", &grp_storage[0], buf[0], sizeof(buf[0]), &grp[0]);
ASSERT_EQ(0, result);
check_group(grp[0], "root", 0);
grp[1] = getgrnam("system");
check_group(grp[1], "system", 1000);
result = getgrnam_r("radio", &grp_storage[1], buf[1], sizeof(buf[1]), &grp[2]);
ASSERT_EQ(0, result);
check_group(grp[2], "radio", 1001);
check_group(grp[0], "root", 0);
check_group(grp[1], "system", 1000);
#else
print_no_getgrnam_test_info();
#endif
}
TEST(getgrgid_r, reentrancy) {
#if defined(__BIONIC__)
group grp_storage[2];
char buf[2][512];
group* grp[3];
int result = getgrgid_r(0, &grp_storage[0], buf[0], sizeof(buf[0]), &grp[0]);
ASSERT_EQ(0, result);
check_group(grp[0], "root", 0);
grp[1] = getgrgid(1000);
check_group(grp[1], "system", 1000);
result = getgrgid_r(1001, &grp_storage[1], buf[1], sizeof(buf[1]), &grp[2]);
ASSERT_EQ(0, result);
check_group(grp[2], "radio", 1001);
check_group(grp[0], "root", 0);
check_group(grp[1], "system", 1000);
#else
print_no_getgrnam_test_info();
#endif
}
TEST(getgrnam_r, large_enough_suggested_buffer_size) {
long size = sysconf(_SC_GETGR_R_SIZE_MAX);
ASSERT_GT(size, 0);
char buf[size];
group grp_storage;
group* grp;
ASSERT_EQ(0, getgrnam_r("root", &grp_storage, buf, size, &grp));
check_group(grp, "root", 0);
}