root/luci/trunk/libs/nixio/src/user.c @ 7351

/*
 * nixio - Linux I/O library for lua
 *
 *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
 *
 *  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 "nixio.h"
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <sys/param.h>

#ifndef __WINNT__

#include <grp.h>
#include <pwd.h>

#ifndef BSD
#ifndef NO_SHADOW
#include <shadow.h>
#endif
#include <crypt.h>
#endif

int nixio__check_group(lua_State *L, int idx) {
    if (lua_isnumber(L, idx)) {
        return lua_tointeger(L, idx);
    } else if (lua_isstring(L, idx)) {
        struct group *g = getgrnam(lua_tostring(L, idx));
        return (!g) ? -1 : g->gr_gid;
    } else {
        return luaL_argerror(L, idx, "supported values: <groupname>, <gid>");
    }
}

int nixio__check_user(lua_State *L, int idx) {
    if (lua_isnumber(L, idx)) {
        return lua_tointeger(L, idx);
    } else if (lua_isstring(L, idx)) {
        struct passwd *p = getpwnam(lua_tostring(L, idx));
        return (!p) ? -1 : p->pw_uid;
    } else {
        return luaL_argerror(L, idx, "supported values: <username>, <uid>");
    }
}


static int nixio__push_group(lua_State *L, struct group *gr) {
    lua_createtable(L, 0, 4);
    lua_pushstring(L, gr->gr_name);
    lua_setfield(L, -2, "name");
    lua_pushstring(L, gr->gr_passwd);
    lua_setfield(L, -2, "passwd");
    lua_pushinteger(L, gr->gr_gid);
    lua_setfield(L, -2, "gid");
    lua_newtable(L);

    for (int i=0; gr->gr_mem[i]; i++) {
        lua_pushstring(L, gr->gr_mem[i]);
        lua_rawseti(L, -2, i+1);
    }

    lua_setfield(L, -2, "mem");
    return 1;
}

static int nixio_getgr(lua_State *L) {
    struct group *gr;
    errno = 0;
    if (lua_isnumber(L, 1)) {
        gr = getgrgid(lua_tointeger(L, 1));
    } else if (lua_isstring(L, 1)) {
        gr = getgrnam(lua_tostring(L, 1));
    } else if (lua_isnoneornil(L, 1)) {
        lua_newtable(L);
        int i = 0;

        setgrent();
        while ((gr = getgrent())) {
            nixio__push_group(L, gr);
            lua_rawseti(L, -2, ++i);
        }

        if (errno) {
            return nixio__perror(L);
        }

        endgrent();
        return 1;
    } else {
        return luaL_argerror(L, 1, "supported values: <groupname>, <gid>");
    }

    if (!gr) {
        return nixio__perror(L);
    } else {
        return nixio__push_group(L, gr);
    }
}

static int nixio__push_passwd(lua_State *L, struct passwd *pw) {
    lua_createtable(L, 0, 7);
    lua_pushstring(L, pw->pw_name);
    lua_setfield(L, -2, "name");
    lua_pushstring(L, pw->pw_passwd);
    lua_setfield(L, -2, "passwd");
    lua_pushinteger(L, pw->pw_gid);
    lua_setfield(L, -2, "gid");
    lua_pushinteger(L, pw->pw_uid);
    lua_setfield(L, -2, "uid");
    lua_pushstring(L, pw->pw_dir);
    lua_setfield(L, -2, "dir");
    lua_pushstring(L, pw->pw_gecos);
    lua_setfield(L, -2, "gecos");
    lua_pushstring(L, pw->pw_shell);
    lua_setfield(L, -2, "shell");
    return 1;
}

static int nixio_getpw(lua_State *L) {
    struct passwd *pw;
    errno = 0;
    if (lua_isnumber(L, 1)) {
        pw = getpwuid(lua_tointeger(L, 1));
    } else if (lua_isstring(L, 1)) {
        pw = getpwnam(lua_tostring(L, 1));
    } else if (lua_isnoneornil(L, 1)) {
        lua_newtable(L);
        int i = 0;

        setpwent();
        while ((pw = getpwent())) {
            nixio__push_passwd(L, pw);
            lua_rawseti(L, -2, ++i);
        }

        if (errno) {
            return nixio__perror(L);
        }

        endpwent();
        return 1;
    } else {
        return luaL_argerror(L, 1, "supported values: <username>, <uid>");
    }

    if (!pw) {
        return nixio__perror(L);
    } else {
        return nixio__push_passwd(L, pw);
    }
}

#ifndef BSD
#ifndef NO_SHADOW
static int nixio__push_spwd(lua_State *L, struct spwd *sp) {
    lua_createtable(L, 0, 9);
    lua_pushstring(L, sp->sp_namp);
    lua_setfield(L, -2, "namp");
    lua_pushinteger(L, sp->sp_expire);
    lua_setfield(L, -2, "expire");
    lua_pushinteger(L, sp->sp_flag);
    lua_setfield(L, -2, "flag");
    lua_pushinteger(L, sp->sp_inact);
    lua_setfield(L, -2, "inact");
    lua_pushinteger(L, sp->sp_lstchg);
    lua_setfield(L, -2, "lstchg");
    lua_pushinteger(L, sp->sp_max);
    lua_setfield(L, -2, "max");
    lua_pushinteger(L, sp->sp_min);
    lua_setfield(L, -2, "min");
    lua_pushinteger(L, sp->sp_warn);
    lua_setfield(L, -2, "warn");
    lua_pushstring(L, sp->sp_pwdp);
    lua_setfield(L, -2, "pwdp");
    return 1;
}

static int nixio_getsp(lua_State *L) {
    struct spwd *sp;
    errno = 0;
    if (lua_isstring(L, 1)) {
        sp = getspnam(lua_tostring(L, 1));
    } else if (lua_isnoneornil(L, 1)) {
        lua_newtable(L);
        int i = 0;

        setspent();
        while ((sp = getspent())) {
            nixio__push_spwd(L, sp);
            lua_rawseti(L, -2, ++i);
        }

        if (errno) {
            return nixio__perror(L);
        }

        endspent();
        return 1;
    } else {
        return luaL_argerror(L, 1, "supported values: <username>");
    }

    if (!sp) {
        return nixio__perror(L);
    } else {
        return nixio__push_spwd(L, sp);
    }
}
#endif /* !NO_SHADOW */
#endif /* !BSD */

static int nixio_crypt(lua_State *L) {
    const char *key = luaL_checkstring(L, 1);
    const char *salt = luaL_checkstring(L, 2);
    const char *hash = crypt(key, salt);

    if (hash) {
        lua_pushstring(L, hash);
    } else {
        lua_pushnil(L);
    }

    return 1;
}


/* module table */
static const luaL_reg R[] = {
    {"crypt",       nixio_crypt},
    {"getgr",       nixio_getgr},
    {"getpw",       nixio_getpw},
#ifndef BSD
#ifndef NO_SHADOW
    {"getsp",       nixio_getsp},
#endif
#endif
    {NULL,          NULL}
};

#else /* __WINNT__ */

static const luaL_reg R[] = {
        {NULL,          NULL}
};

#endif

void nixio_open_user(lua_State *L) {
    luaL_register(L, NULL, R);
}