ipwd.c revision 5cc9289a900f5d40d126ca663790dca2a7456416
/* Copyright (c) 2011 Dovecot authors, see the included COPYING file */
#define _POSIX_PTHREAD_SEMANTICS /* for Solaris */
#include "lib.h"
#include "ipwd.h"
#include <unistd.h>
#define DEFAULT_PWBUF_SIZE 16384
#define DEFAULT_GRBUF_SIZE 16384
static void *pwbuf = NULL, *grbuf = NULL;
static size_t pwbuf_size, grbuf_size;
static void pw_init(void)
{
long size;
if (pwbuf == NULL) {
size = sysconf(_SC_GETPW_R_SIZE_MAX);
if (size < 0)
size = DEFAULT_PWBUF_SIZE;
pwbuf_size = size;
pwbuf = i_malloc(pwbuf_size);
}
}
static void gr_init(void)
{
long size;
if (grbuf == NULL) {
size = sysconf(_SC_GETGR_R_SIZE_MAX);
/* Some BSDs return too low value for this. instead of trying
to figure out exactly which, just make sure it's at least
a reasonable size. if the real size is smaller, it doesn't
matter much that we waste a few kilobytes of memory. */
if (size < DEFAULT_GRBUF_SIZE)
size = DEFAULT_GRBUF_SIZE;
grbuf_size = size;
grbuf = i_malloc(grbuf_size);
}
}
void ipwd_deinit(void)
{
i_free_and_null(pwbuf);
i_free_and_null(grbuf);
}
int i_getpwnam(const char *name, struct passwd *pwd_r)
{
struct passwd *result;
pw_init();
errno = getpwnam_r(name, pwd_r, pwbuf, pwbuf_size, &result);
if (result != NULL)
return 1;
return errno == 0 ? 0 : -1;
}
int i_getpwuid(uid_t uid, struct passwd *pwd_r)
{
struct passwd *result;
pw_init();
errno = getpwuid_r(uid, pwd_r, pwbuf, pwbuf_size, &result);
if (result != NULL)
return 1;
return errno == 0 ? 0 : -1;
}
int i_getgrnam(const char *name, struct group *grp_r)
{
struct group *result;
gr_init();
errno = getgrnam_r(name, grp_r, grbuf, grbuf_size, &result);
if (result != NULL)
return 1;
return errno == 0 ? 0 : -1;
}
int i_getgrgid(gid_t gid, struct group *grp_r)
{
struct group *result;
gr_init();
errno = getgrgid_r(gid, grp_r, grbuf, grbuf_size, &result);
if (result != NULL)
return 1;
return errno == 0 ? 0 : -1;
}