src/lib/ipwd.c

	ipwd.c revision 1b85e6aaaefffa0ac0add84713e6d15daa4e01bb
/* 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) {
        /* OpenBSD (up to 4.8 at least) reports too low value in
           sysconf() */
#ifndef __OpenBSD__
        size = sysconf(_SC_GETGR_R_SIZE_MAX);
        if (size < 0)
#endif
            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;
}