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Add clearing of resolv uid and pid interface maps

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Cleanup uid interface map variable names

Change-Id: I712dd83276bb23b149af4180515ef33a1bade5ea
This commit is contained in:
Chad Brubaker 2013-06-06 15:23:33 -07:00
parent a24d14c05d
commit 87594a32b8
2 changed files with 63 additions and 21 deletions
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74
libc/netbsd/resolv/res_cache.c
View file

@ -1259,8 +1259,8 @@ typedef struct resolv_pidiface_info {
struct resolv_pidiface_info* next;
} PidIfaceInfo;
typedef struct resolv_uidiface_info {
int low;
int high;
int uid_start;
int uid_end;
char ifname[IF_NAMESIZE + 1];
struct resolv_uidiface_info* next;
} UidIfaceInfo;
@ -1852,9 +1852,9 @@ static void _remove_pidiface_info_locked(int pid);
static struct resolv_pidiface_info* _get_pid_iface_info_locked(int pid);
/* remove a resolv_pidiface_info structure from _res_uidiface_list */
static int _remove_uidiface_info_locked(int low, int high);
static int _remove_uidiface_info_locked(int uid_start, int uid_end);
/* check if a range [low,high] overlaps with any already existing ranges in the uid=>iface map*/
static int _resolv_check_uid_range_overlap_locked(int low, int high);
static int _resolv_check_uid_range_overlap_locked(int uid_start, int uid_end);
/* get a resolv_uidiface_info structure from _res_uidiface_list with a certain uid */
static struct resolv_uidiface_info* _get_uid_iface_info_locked(int uid);
@ -2433,11 +2433,11 @@ _resolv_get_pids_associated_interface(int pid, char* buff, int buffLen)
}
static int
_remove_uidiface_info_locked(int low, int high) {
struct resolv_uidiface_info* result = &_res_uidiface_list.next;
_remove_uidiface_info_locked(int uid_start, int uid_end) {
struct resolv_uidiface_info* result = _res_uidiface_list.next;
struct resolv_uidiface_info* prev = NULL;
while (result != NULL && result->low != low && result->high != high) {
while (result != NULL && result->uid_start != uid_start && result->uid_end != uid_end) {
prev = result;
result = result->next;
}
@ -2453,8 +2453,8 @@ _remove_uidiface_info_locked(int low, int high) {
static struct resolv_uidiface_info*
_get_uid_iface_info_locked(int uid)
{
struct resolv_uidiface_info* result = &_res_uidiface_list.next;
while (result != NULL && !(result->low <= uid && result->high >= uid)) {
struct resolv_uidiface_info* result = _res_uidiface_list.next;
while (result != NULL && !(result->uid_start <= uid && result->uid_end >= uid)) {
result = result->next;
}
@ -2462,11 +2462,11 @@ _get_uid_iface_info_locked(int uid)
}
static int
_resolv_check_uid_range_overlap_locked(int low, int high)
_resolv_check_uid_range_overlap_locked(int uid_start, int uid_end)
{
struct resolv_uidiface_info* cur = &_res_uidiface_list.next;
struct resolv_uidiface_info* cur = _res_uidiface_list.next;
while (cur != NULL) {
if (cur->low <= high && cur->high >= low) {
if (cur->uid_start <= uid_end && cur->uid_end >= uid_start) {
return -1;
}
cur = cur->next;
@ -2474,20 +2474,56 @@ _resolv_check_uid_range_overlap_locked(int low, int high)
return 0;
}
void
_resolv_clear_iface_uid_range_mapping()
{
pthread_once(&_res_cache_once, _res_cache_init);
pthread_mutex_lock(&_res_uidiface_list_lock);
struct resolv_uidiface_info *current = _res_uidiface_list.next;
struct resolv_uidiface_info *next;
while (current != NULL) {
next = current->next;
free(current);
current = next;
}
_res_uidiface_list.next = NULL;
pthread_mutex_unlock(&_res_uidiface_list_lock);
}
void
_resolv_clear_iface_pid_mapping()
{
pthread_once(&_res_cache_once, _res_cache_init);
pthread_mutex_lock(&_res_pidiface_list_lock);
struct resolv_pidiface_info *current = _res_pidiface_list.next;
struct resolv_pidiface_info *next;
while (current != NULL) {
next = current->next;
free(current);
current = next;
}
_res_pidiface_list.next = NULL;
pthread_mutex_unlock(&_res_pidiface_list_lock);
}
int
_resolv_set_iface_for_uid_range(const char* ifname, int low, int high)
_resolv_set_iface_for_uid_range(const char* ifname, int uid_start, int uid_end)
{
int rv = 0;
struct resolv_uidiface_info* uidiface_info;
// make sure the uid iface list is created
pthread_once(&_res_cache_once, _res_cache_init);
if (uid_start > uid_end) {
errno = EINVAL;
return -1;
}
pthread_mutex_lock(&_res_uidiface_list_lock);
//check that we aren't adding an overlapping range
if (!_resolv_check_uid_range_overlap_locked(low,high)) {
if (!_resolv_check_uid_range_overlap_locked(uid_start, uid_end)) {
uidiface_info = calloc(sizeof(*uidiface_info), 1);
if (uidiface_info) {
uidiface_info->low = low;
uidiface_info->high = high;
uidiface_info->uid_start = uid_start;
uidiface_info->uid_end = uid_end;
int len = sizeof(uidiface_info->ifname);
strncpy(uidiface_info->ifname, ifname, len - 1);
uidiface_info->ifname[len - 1] = '\0';
@ -2512,14 +2548,14 @@ _resolv_set_iface_for_uid_range(const char* ifname, int low, int high)
}
int
_resolv_clear_iface_for_uid_range(int low, int high)
_resolv_clear_iface_for_uid_range(int uid_start, int uid_end)
{
pthread_once(&_res_cache_once, _res_cache_init);
pthread_mutex_lock(&_res_uidiface_list_lock);
int rv = _remove_uidiface_info_locked(low, high);
int rv = _remove_uidiface_info_locked(uid_start, uid_end);
XLOG("_resolv_clear_iface_for_uid_range: low %d high %d\n", low, high);
XLOG("_resolv_clear_iface_for_uid_range: [%d,%d]\n", uid_start, uid_end);
pthread_mutex_unlock(&_res_uidiface_list_lock);

10
libc/private/resolv_iface.h
View file

@ -66,6 +66,9 @@ extern void _resolv_set_iface_for_pid(const char* ifname, int pid);
/* clear pid from being associated with an interface */
extern void _resolv_clear_iface_for_pid(int pid);
/* clear the entire mapping of pids to interfaces. */
extern void _resolv_clear_iface_pid_mapping();
/** Gets the name of the interface to which the pid is attached.
* On error, -1 is returned.
* If no interface is found, 0 is returned and buff is set to empty ('\0').
@ -78,11 +81,14 @@ extern int _resolv_get_pids_associated_interface(int pid, char* buff, int buffLe
/** set a uid range to use the name servers of the specified interface
* If [low,high] overlaps with an already existing rule -1 is returned */
extern int _resolv_set_iface_for_uid_range(const char* ifname, int low, int high);
extern int _resolv_set_iface_for_uid_range(const char* ifname, int uid_start, int uid_end);
/* clear a uid range from being associated with an interface
* If the range given is not mapped -1 is returned. */
extern int _resolv_clear_iface_for_uid_range(int low, int high);
extern int _resolv_clear_iface_for_uid_range(int uid_start, int uid_end);
/* clear the entire mapping of uid ranges to interfaces. */
extern void _resolv_clear_iface_uid_range_mapping();
/** Gets the name of the interface to which the uid is attached.
* On error, -1 is returned.