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rpm/luaext/lposix.c

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/*
* lposix.c
* POSIX library for Lua 5.0. Based on original by Claudio Terra for Lua 3.x.
* Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
* 05 Nov 2003 22:09:10
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#define MYNAME "posix"
#define MYVERSION MYNAME " library for " LUA_VERSION " / Nov 2003"
#include "lua.h"
#include "lauxlib.h"
#include "lposix.h"
#ifndef MYBUFSIZ
#define MYBUFSIZ 512
#endif
#include "modemuncher.c"
static const char *filetype(mode_t m)
{
if (S_ISREG(m)) return "regular";
else if (S_ISLNK(m)) return "link";
else if (S_ISDIR(m)) return "directory";
else if (S_ISCHR(m)) return "character device";
else if (S_ISBLK(m)) return "block device";
else if (S_ISFIFO(m)) return "fifo";
else if (S_ISSOCK(m)) return "socket";
else return "?";
}
typedef int (*Selector)(lua_State *L, int i, const void *data);
static int doselection(lua_State *L, int i, const char *const S[], Selector F, const void *data)
{
if (lua_isnone(L, i))
{
lua_newtable(L);
for (i=0; S[i]!=NULL; i++)
{
lua_pushstring(L, S[i]);
F(L, i, data);
lua_settable(L, -3);
}
return 1;
}
else
{
int j=luaL_checkoption(L, i, NULL, S);
if (j==-1) luaL_argerror(L, i, "unknown selector");
return F(L, j, data);
}
}
static void storeindex(lua_State *L, int i, const char *value)
{
lua_pushstring(L, value);
lua_rawseti(L, -2, i);
}
static void storestring(lua_State *L, const char *name, const char *value)
{
lua_pushstring(L, name);
lua_pushstring(L, value);
lua_settable(L, -3);
}
static void storenumber(lua_State *L, const char *name, lua_Number value)
{
lua_pushstring(L, name);
lua_pushnumber(L, value);
lua_settable(L, -3);
}
static int pusherror(lua_State *L, const char *info)
{
lua_pushnil(L);
if (info==NULL)
lua_pushstring(L, strerror(errno));
else
lua_pushfstring(L, "%s: %s", info, strerror(errno));
lua_pushnumber(L, errno);
return 3;
}
static int pushresult(lua_State *L, int i, const char *info)
{
if (i != -1)
{
lua_pushnumber(L, i);
return 1;
}
else
return pusherror(L, info);
}
static void badoption(lua_State *L, int i, const char *what, int option)
{
luaL_argerror(L, 2,
lua_pushfstring(L, "unknown %s option `%c'", what, option));
}
static uid_t mygetuid(lua_State *L, int i)
{
if (lua_isnone(L, i))
return -1;
else if (lua_isnumber(L, i))
return (uid_t) lua_tonumber(L, i);
else if (lua_isstring(L, i))
{
struct passwd *p=getpwnam(lua_tostring(L, i));
return (p==NULL) ? -1 : p->pw_uid;
}
else
return luaL_typerror(L, i, "string or number");
}
static gid_t mygetgid(lua_State *L, int i)
{
if (lua_isnone(L, i))
return -1;
else if (lua_isnumber(L, i))
return (gid_t) lua_tonumber(L, i);
else if (lua_isstring(L, i))
{
struct group *g=getgrnam(lua_tostring(L, i));
return (g==NULL) ? -1 : g->gr_gid;
}
else
return luaL_typerror(L, i, "string or number");
}
static int Perrno(lua_State *L) /** errno() */
{
lua_pushstring(L, strerror(errno));
lua_pushnumber(L, errno);
return 2;
}
static int Pdir(lua_State *L) /** dir([path]) */
{
const char *path = luaL_optstring(L, 1, ".");
DIR *d = opendir(path);
if (d == NULL)
return pusherror(L, path);
else
{
int i;
struct dirent *entry;
lua_newtable(L);
for (i=1; (entry = readdir(d)) != NULL; i++)
storeindex(L, i, entry->d_name);
closedir(d);
return 1;
}
}
static int aux_files(lua_State *L)
{
DIR *d = lua_touserdata(L, lua_upvalueindex(1));
struct dirent *entry;
if (d == NULL) luaL_error(L, "attempt to use closed dir");
entry = readdir(d);
if (entry == NULL)
{
closedir(d);
lua_pushnil(L);
lua_replace(L, lua_upvalueindex(1));
lua_pushnil(L);
}
else
{
lua_pushstring(L, entry->d_name);
#if 0
#ifdef _DIRENT_HAVE_D_TYPE
lua_pushstring(L, filetype(DTTOIF(entry->d_type)));
return 2;
#endif
#endif
}
return 1;
}
static int Pfiles(lua_State *L) /** files([path]) */
{
const char *path = luaL_optstring(L, 1, ".");
DIR *d = opendir(path);
if (d == NULL)
return pusherror(L, path);
else
{
lua_pushlightuserdata(L, d);
lua_pushcclosure(L, aux_files, 1);
return 1;
}
}
static int Pgetcwd(lua_State *L) /** getcwd() */
{
char buf[MYBUFSIZ];
if (getcwd(buf, sizeof(buf)) == NULL)
return pusherror(L, ".");
else
{
lua_pushstring(L, buf);
return 1;
}
}
static int Pmkdir(lua_State *L) /** mkdir(path) */
{
const char *path = luaL_checkstring(L, 1);
return pushresult(L, mkdir(path, 0777), path);
}
static int Pchdir(lua_State *L) /** chdir(path) */
{
const char *path = luaL_checkstring(L, 1);
return pushresult(L, chdir(path), path);
}
static int Prmdir(lua_State *L) /** rmdir(path) */
{
const char *path = luaL_checkstring(L, 1);
return pushresult(L, rmdir(path), path);
}
static int Punlink(lua_State *L) /** unlink(path) */
{
const char *path = luaL_checkstring(L, 1);
return pushresult(L, unlink(path), path);
}
static int Plink(lua_State *L) /** link(oldpath,newpath) */
{
const char *oldpath = luaL_checkstring(L, 1);
const char *newpath = luaL_checkstring(L, 2);
return pushresult(L, link(oldpath, newpath), NULL);
}
static int Psymlink(lua_State *L) /** symlink(oldpath,newpath) */
{
const char *oldpath = luaL_checkstring(L, 1);
const char *newpath = luaL_checkstring(L, 2);
return pushresult(L, symlink(oldpath, newpath), NULL);
}
static int Preadlink(lua_State *L) /** readlink(path) */
{
char buf[MYBUFSIZ];
const char *path = luaL_checkstring(L, 1);
int n = readlink(path, buf, sizeof(buf));
if (n==-1) return pusherror(L, path);
lua_pushlstring(L, buf, n);
return 1;
}
static int Paccess(lua_State *L) /** access(path,[mode]) */
{
int mode=F_OK;
const char *path=luaL_checkstring(L, 1);
const char *s;
for (s=luaL_optstring(L, 2, "f"); *s!=0 ; s++)
switch (*s)
{
case ' ': break;
case 'r': mode |= R_OK; break;
case 'w': mode |= W_OK; break;
case 'x': mode |= X_OK; break;
case 'f': mode |= F_OK; break;
default: badoption(L, 2, "mode", *s); break;
}
return pushresult(L, access(path, mode), path);
}
static int Pmkfifo(lua_State *L) /** mkfifo(path) */
{
const char *path = luaL_checkstring(L, 1);
return pushresult(L, mkfifo(path, 0777), path);
}
static int Pexec(lua_State *L) /** exec(path,[args]) */
{
const char *path = luaL_checkstring(L, 1);
int i,n=lua_gettop(L);
char **argv = malloc((n+1)*sizeof(char*));
if (argv==NULL) luaL_error(L,"not enough memory");
argv[0] = (char*)path;
for (i=1; i<n; i++) argv[i] = (char*)luaL_checkstring(L, i+1);
argv[i] = NULL;
execvp(path,argv);
return pusherror(L, path);
}
static int Pfork(lua_State *L) /** fork() */
{
return pushresult(L, fork(), NULL);
}
static int Pwait(lua_State *L) /** wait([pid]) */
{
pid_t pid = luaL_optint(L, 1, -1);
return pushresult(L, waitpid(pid, NULL, 0), NULL);
}
static int Pkill(lua_State *L) /** kill(pid,[sig]) */
{
pid_t pid = luaL_checkint(L, 1);
int sig = luaL_optint(L, 2, SIGTERM);
return pushresult(L, kill(pid, sig), NULL);
}
static int Psleep(lua_State *L) /** sleep(seconds) */
{
unsigned int seconds = luaL_checkint(L, 1);
lua_pushnumber(L, sleep(seconds));
return 1;
}
static int Pputenv(lua_State *L) /** putenv(string) */
{
size_t l;
const char *s=luaL_checklstring(L, 1, &l);
char *e=malloc(++l);
return pushresult(L, (e==NULL) ? -1 : putenv(memcpy(e,s,l)), s);
}
static int Psetenv(lua_State *L) /** setenv(name,value,[over]) */
{
const char *name=luaL_checkstring(L, 1);
const char *value=luaL_checkstring(L, 2);
int overwrite=lua_isnoneornil(L, 3) || lua_toboolean(L, 3);
return pushresult(L, setenv(name,value,overwrite), name);
}
static int Punsetenv(lua_State *L) /** unsetenv(name) */
{
const char *name=luaL_checkstring(L, 1);
unsetenv(name);
return 0;
}
static int Pgetenv(lua_State *L) /** getenv([name]) */
{
if (lua_isnone(L, 1))
{
#ifdef __APPLE__
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#else
extern char **environ;
#endif /* __APPLE__ */
char **e;
if (*environ==NULL) lua_pushnil(L); else lua_newtable(L);
for (e=environ; *e!=NULL; e++)
{
char *s=*e;
char *eq=strchr(s, '=');
if (eq==NULL) /* will this ever happen? */
{
lua_pushstring(L,s);
lua_pushboolean(L,0);
}
else
{
lua_pushlstring(L,s,eq-s);
lua_pushstring(L,eq+1);
}
lua_settable(L,-3);
}
}
else
lua_pushstring(L, getenv(luaL_checkstring(L, 1)));
return 1;
}
static int Pumask(lua_State *L) /** umask([mode]) */
{
char m[10];
mode_t mode;
umask(mode=umask(0));
mode=(~mode)&0777;
if (!lua_isnone(L, 1))
{
if (mode_munch(&mode, luaL_checkstring(L, 1)))
{
lua_pushnil(L);
return 1;
}
mode&=0777;
umask(~mode);
}
modechopper(mode, m);
lua_pushstring(L, m);
return 1;
}
static int Pchmod(lua_State *L) /** chmod(path,mode) */
{
mode_t mode;
struct stat s;
const char *path = luaL_checkstring(L, 1);
const char *modestr = luaL_checkstring(L, 2);
if (stat(path, &s)) return pusherror(L, path);
mode = s.st_mode;
if (mode_munch(&mode, modestr)) luaL_argerror(L, 2, "bad mode");
return pushresult(L, chmod(path, mode), path);
}
static int Pchown(lua_State *L) /** chown(path,uid,gid) */
{
const char *path = luaL_checkstring(L, 1);
uid_t uid = mygetuid(L, 2);
gid_t gid = mygetgid(L, 3);
return pushresult(L, chown(path, uid, gid), path);
}
static int Putime(lua_State *L) /** utime(path,[mtime,atime]) */
{
struct utimbuf times;
time_t currtime = time(NULL);
const char *path = luaL_checkstring(L, 1);
times.modtime = luaL_optnumber(L, 2, currtime);
times.actime = luaL_optnumber(L, 3, currtime);
return pushresult(L, utime(path, &times), path);
}
static int FgetID(lua_State *L, int i, const void *data)
{
switch (i)
{
case 0: lua_pushnumber(L, getegid()); break;
case 1: lua_pushnumber(L, geteuid()); break;
case 2: lua_pushnumber(L, getgid()); break;
case 3: lua_pushnumber(L, getuid()); break;
case 4: lua_pushnumber(L, getpgrp()); break;
case 5: lua_pushnumber(L, getpid()); break;
case 6: lua_pushnumber(L, getppid()); break;
}
return 1;
}
static const char *const SgetID[] =
{
"egid", "euid", "gid", "uid", "pgrp", "pid", "ppid", NULL
};
static int Pgetprocessid(lua_State *L) /** getprocessid([selector]) */
{
return doselection(L, 1, SgetID, FgetID, NULL);
}
static int Pttyname(lua_State *L) /** ttyname(fd) */
{
int fd=luaL_optint(L, 1, 0);
lua_pushstring(L, ttyname(fd));
return 1;
}
static int Pctermid(lua_State *L) /** ctermid() */
{
char b[L_ctermid];
lua_pushstring(L, ctermid(b));
return 1;
}
static int Pgetlogin(lua_State *L) /** getlogin() */
{
lua_pushstring(L, getlogin());
return 1;
}
static int Fgetpasswd(lua_State *L, int i, const void *data)
{
const struct passwd *p=data;
switch (i)
{
case 0: lua_pushstring(L, p->pw_name); break;
case 1: lua_pushnumber(L, p->pw_uid); break;
case 2: lua_pushnumber(L, p->pw_gid); break;
case 3: lua_pushstring(L, p->pw_dir); break;
case 4: lua_pushstring(L, p->pw_shell); break;
/* not strictly POSIX */
case 5: lua_pushstring(L, p->pw_gecos); break;
case 6: lua_pushstring(L, p->pw_passwd); break;
}
return 1;
}
static const char *const Sgetpasswd[] =
{
"name", "uid", "gid", "dir", "shell", "gecos", "passwd", NULL
};
static int Pgetpasswd(lua_State *L) /** getpasswd(name or id) */
{
struct passwd *p=NULL;
if (lua_isnoneornil(L, 1))
p = getpwuid(geteuid());
else if (lua_isnumber(L, 1))
p = getpwuid((uid_t)lua_tonumber(L, 1));
else if (lua_isstring(L, 1))
p = getpwnam(lua_tostring(L, 1));
else
luaL_typerror(L, 1, "string or number");
if (p==NULL)
lua_pushnil(L);
else
doselection(L, 2, Sgetpasswd, Fgetpasswd, p);
return 1;
}
static int Pgetgroup(lua_State *L) /** getgroup(name or id) */
{
struct group *g=NULL;
if (lua_isnumber(L, 1))
g = getgrgid((gid_t)lua_tonumber(L, 1));
else if (lua_isstring(L, 1))
g = getgrnam(lua_tostring(L, 1));
else
luaL_typerror(L, 1, "string or number");
if (g==NULL)
lua_pushnil(L);
else
{
int i;
lua_newtable(L);
storestring(L, "name", g->gr_name);
storenumber(L, "gid", g->gr_gid);
for (i=0; g->gr_mem[i] != NULL; i++)
storeindex(L, i+1, g->gr_mem[i]);
}
return 1;
}
static int Psetuid(lua_State *L) /** setuid(name or id) */
{
return pushresult(L, setuid(mygetuid(L, 1)), NULL);
}
static int Psetgid(lua_State *L) /** setgid(name or id) */
{
return pushresult(L, setgid(mygetgid(L, 1)), NULL);
}
struct mytimes
{
struct tms t;
clock_t elapsed;
};
#define pushtime(L,x) lua_pushnumber(L,((lua_Number)x)/CLOCKS_PER_SEC)
static int Ftimes(lua_State *L, int i, const void *data)
{
const struct mytimes *t=data;
switch (i)
{
case 0: pushtime(L, t->t.tms_utime); break;
case 1: pushtime(L, t->t.tms_stime); break;
case 2: pushtime(L, t->t.tms_cutime); break;
case 3: pushtime(L, t->t.tms_cstime); break;
case 4: pushtime(L, t->elapsed); break;
}
return 1;
}
static const char *const Stimes[] =
{
"utime", "stime", "cutime", "cstime", "elapsed", NULL
};
#define storetime(L,name,x) storenumber(L,name,(lua_Number)x/CLOCKS_PER_SEC)
static int Ptimes(lua_State *L) /** times() */
{
struct mytimes t;
t.elapsed = times(&t.t);
return doselection(L, 1, Stimes, Ftimes, &t);
}
struct mystat
{
struct stat s;
char mode[10];
const char *type;
};
static int Fstat(lua_State *L, int i, const void *data)
{
const struct mystat *s=data;
switch (i)
{
case 0: lua_pushstring(L, s->mode); break;
case 1: lua_pushnumber(L, s->s.st_ino); break;
case 2: lua_pushnumber(L, s->s.st_dev); break;
case 3: lua_pushnumber(L, s->s.st_nlink); break;
case 4: lua_pushnumber(L, s->s.st_uid); break;
case 5: lua_pushnumber(L, s->s.st_gid); break;
case 6: lua_pushnumber(L, s->s.st_size); break;
case 7: lua_pushnumber(L, s->s.st_atime); break;
case 8: lua_pushnumber(L, s->s.st_mtime); break;
case 9: lua_pushnumber(L, s->s.st_ctime); break;
case 10:lua_pushstring(L, s->type); break;
case 11:lua_pushnumber(L, s->s.st_mode); break;
}
return 1;
}
static const char *const Sstat[] =
{
"mode", "ino", "dev", "nlink", "uid", "gid",
"size", "atime", "mtime", "ctime", "type", "_mode",
NULL
};
static int Pstat(lua_State *L) /** stat(path,[selector]) */
{
struct mystat s;
const char *path=luaL_checkstring(L, 1);
if (lstat(path,&s.s)==-1) return pusherror(L, path);
s.type=filetype(s.s.st_mode);
modechopper(s.s.st_mode, s.mode);
return doselection(L, 2, Sstat, Fstat, &s);
}
static int Puname(lua_State *L) /** uname([string]) */
{
struct utsname u;
luaL_Buffer b;
const char *s;
if (uname(&u) == -1) return pusherror(L, NULL);
luaL_buffinit(L, &b);
for (s=luaL_optstring(L, 1, "%s %n %r %v %m"); *s; s++)
if (*s!='%')
luaL_putchar(&b, *s);
else switch (*++s)
{
case '%': luaL_putchar(&b, *s); break;
case 'm': luaL_addstring(&b,u.machine); break;
case 'n': luaL_addstring(&b,u.nodename); break;
case 'r': luaL_addstring(&b,u.release); break;
case 's': luaL_addstring(&b,u.sysname); break;
case 'v': luaL_addstring(&b,u.version); break;
default: badoption(L, 2, "format", *s); break;
}
luaL_pushresult(&b);
return 1;
}
static const int Kpathconf[] =
{
_PC_LINK_MAX, _PC_MAX_CANON, _PC_MAX_INPUT, _PC_NAME_MAX, _PC_PATH_MAX,
_PC_PIPE_BUF, _PC_CHOWN_RESTRICTED, _PC_NO_TRUNC, _PC_VDISABLE,
-1
};
static int Fpathconf(lua_State *L, int i, const void *data)
{
const char *path=data;
lua_pushnumber(L, pathconf(path, Kpathconf[i]));
return 1;
}
static const char *const Spathconf[] =
{
"link_max", "max_canon", "max_input", "name_max", "path_max",
"pipe_buf", "chown_restricted", "no_trunc", "vdisable",
NULL
};
static int Ppathconf(lua_State *L) /** pathconf(path,[selector]) */
{
const char *path=luaL_checkstring(L, 1);
return doselection(L, 2, Spathconf, Fpathconf, path);
}
static const int Ksysconf[] =
{
_SC_ARG_MAX, _SC_CHILD_MAX, _SC_CLK_TCK, _SC_NGROUPS_MAX, _SC_STREAM_MAX,
_SC_TZNAME_MAX, _SC_OPEN_MAX, _SC_JOB_CONTROL, _SC_SAVED_IDS, _SC_VERSION,
-1
};
static int Fsysconf(lua_State *L, int i, const void *data)
{
lua_pushnumber(L, sysconf(Ksysconf[i]));
return 1;
}
static const char *const Ssysconf[] =
{
"arg_max", "child_max", "clk_tck", "ngroups_max", "stream_max",
"tzname_max", "open_max", "job_control", "saved_ids", "version",
NULL
};
static int Psysconf(lua_State *L) /** sysconf([selector]) */
{
return doselection(L, 1, Ssysconf, Fsysconf, NULL);
}
static int Pmkstemp(lua_State *L)
{
const char *path;
char *dynpath;
int fd;
FILE **f;
path = luaL_checkstring(L, 1);
if (path == NULL)
return 0;
dynpath = strdup(path);
fd = mkstemp(dynpath);
f = (FILE**)lua_newuserdata(L, sizeof(FILE*));
if (f == NULL) {
close(fd);
free(dynpath);
return 0;
}
*f = fdopen(fd, "a+");
lua_pushstring(L, dynpath);
free(dynpath);
luaL_getmetatable(L, "FILE*");
if (lua_isnil(L, -1)) {
lua_pop(L, 1);
luaL_error(L, "FILE* metatable not available "
"(io not loaded?)");
} else {
lua_setmetatable(L, -3);
}
return 2;
}
static const luaL_reg R[] =
{
{"access", Paccess},
{"chdir", Pchdir},
{"chmod", Pchmod},
{"chown", Pchown},
{"ctermid", Pctermid},
{"dir", Pdir},
{"errno", Perrno},
{"exec", Pexec},
{"files", Pfiles},
{"fork", Pfork},
{"getcwd", Pgetcwd},
{"getenv", Pgetenv},
{"getgroup", Pgetgroup},
{"getlogin", Pgetlogin},
{"getpasswd", Pgetpasswd},
{"getprocessid", Pgetprocessid},
{"kill", Pkill},
{"link", Plink},
{"mkdir", Pmkdir},
{"mkfifo", Pmkfifo},
{"mkstemp", Pmkstemp},
{"pathconf", Ppathconf},
{"putenv", Pputenv},
{"readlink", Preadlink},
{"rmdir", Prmdir},
{"setgid", Psetgid},
{"setuid", Psetuid},
{"sleep", Psleep},
{"stat", Pstat},
{"symlink", Psymlink},
{"sysconf", Psysconf},
{"times", Ptimes},
{"ttyname", Pttyname},
{"umask", Pumask},
{"uname", Puname},
{"unlink", Punlink},
{"utime", Putime},
{"wait", Pwait},
{"setenv", Psetenv},
{"unsetenv", Punsetenv},
{NULL, NULL}
};
LUALIB_API int luaopen_posix (lua_State *L)
{
luaL_openlib(L, MYNAME, R, 0);
lua_pushliteral(L,"version"); /** version */
lua_pushliteral(L,MYVERSION);
lua_settable(L,-3);
return 1;
}
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