pposix: Add setgid() function

[prosody.git] / util-src / pposix.c

diff --git a/util-src/pposix.c b/util-src/pposix.c
index 97cd0d419c37ef563f2e4c84a3b3fcd7cd99f034..993e6e876becf361d6f098382c20700fc6078d55 100644 (file)
--- a/util-src/pposix.c
+++ b/util-src/pposix.c
@@ -1,7 +1,7 @@
-/* Prosody IM v0.3
+/* Prosody IM v0.4
 -- Copyright (C) 2008-2009 Matthew Wild
 -- Copyright (C) 2008-2009 Waqas Hussain
--- Copyright 2009 Tobias Markmann
+-- Copyright (C) 2009 Tobias Markmann
 -- 
 -- This project is MIT/X11 licensed. Please see the
 -- COPYING file in the source package for more information.
@@ -25,6 +25,7 @@
 
 #include <syslog.h>
 #include <pwd.h>
+#include <grp.h>
 
 #include <string.h>
 #include <errno.h>
@@ -72,10 +73,10 @@ static int lc_daemonize(lua_State *L)
        }
 
        /* Close stdin, stdout, stderr */
-/*     close(0);
+       close(0);
        close(1);
        close(2);
-*/
+
        /* Final fork, use it wisely */
        if(fork())
                exit(0);
@@ -173,7 +174,7 @@ int level_constants[] =     {
                                LOG_INFO,
                                LOG_NOTICE,
                                LOG_WARNING,
-                               LOG_EMERG,
+                               LOG_CRIT,
                                -1
                        };
 int lc_syslog_log(lua_State* L)
@@ -291,6 +292,64 @@ int lc_setuid(lua_State* L)
        return 2;
 }
 
+int lc_setgid(lua_State* L)
+{
+       int gid = -1;
+       if(lua_gettop(L) < 1)
+               return 0;
+       if(!lua_isnumber(L, 1) && lua_tostring(L, 1))
+       {
+               /* Passed GID is actually a string, so look up the GID */
+               struct group *g;
+               g = getgrnam(lua_tostring(L, 1));
+               if(!g)
+               {
+                       lua_pushboolean(L, 0);
+                       lua_pushstring(L, "no-such-group");
+                       return 2;
+               }
+               gid = g->gr_gid;
+       }
+       else
+       {
+               gid = lua_tonumber(L, 1);
+       }
+       
+       if(gid>-1)
+       {
+               /* Ok, attempt setgid */
+               errno = 0;
+               if(setgid(gid))
+               {
+                       /* Fail */
+                       lua_pushboolean(L, 0);
+                       switch(errno)
+                       {
+                       case EINVAL:
+                               lua_pushstring(L, "invalid-gid");
+                               break;
+                       case EPERM:
+                               lua_pushstring(L, "permission-denied");
+                               break;
+                       default:
+                               lua_pushstring(L, "unknown-error");
+                       }
+                       return 2;
+               }
+               else
+               {
+                       /* Success! */
+                       lua_pushboolean(L, 1);
+                       return 1;
+               }
+       }
+       
+       /* Seems we couldn't find a valid GID to switch to */
+       lua_pushboolean(L, 0);
+       lua_pushstring(L, "invalid-gid");
+       return 2;
+}
+
 /*     Like POSIX's setrlimit()/getrlimit() API functions.
  *     
  *     Syntax:
@@ -322,7 +381,7 @@ int lc_setrlimit(lua_State *L) {
        int rid = -1;
        if(arguments < 1 || arguments > 3) {
                lua_pushboolean(L, 0);
-               lua_pushstring(L, "Wrong number of arguments");
+               lua_pushstring(L, "incorrect-arguments");
        }
        
        resource = luaL_checkstring(L, 1);
@@ -337,7 +396,7 @@ int lc_setrlimit(lua_State *L) {
                if (softlimit < 0 || hardlimit < 0) {
                        if (getrlimit(rid, &lim_current)) {
                                lua_pushboolean(L, 0);
-                               lua_pushstring(L, "getrlimit() failed.");
+                               lua_pushstring(L, "getrlimit-failed");
                                return 2;
                        }
                }
@@ -349,12 +408,13 @@ int lc_setrlimit(lua_State *L) {
                
                if (setrlimit(rid, &lim)) {
                        lua_pushboolean(L, 0);
-                       lua_pushstring(L, "setrlimit() failed.");
+                       lua_pushstring(L, "setrlimit-failed");
                        return 2;
                }
        } else {
+               /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */
                lua_pushboolean(L, 0);
-               lua_pushstring(L, "Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard.");
+               lua_pushstring(L, "invalid-resource");
                return 2;
        }
        lua_pushboolean(L, 1);
@@ -369,7 +429,7 @@ int lc_getrlimit(lua_State *L) {
        
        if (arguments != 1) {
                lua_pushboolean(L, 0);
-               lua_pushstring(L, "I expect one argument only, the resource string.");
+               lua_pushstring(L, "invalid-arguments");
                return 2;
        }
        
@@ -378,12 +438,13 @@ int lc_getrlimit(lua_State *L) {
        if (rid != -1) {
                if (getrlimit(rid, &lim)) {
                        lua_pushboolean(L, 0);
-                       lua_pushstring(L, "getrlimit() failed.");
+                       lua_pushstring(L, "getrlimit-failed.");
                        return 2;
                }
        } else {
+               /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */
                lua_pushboolean(L, 0);
-               lua_pushstring(L, "Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard.");
+               lua_pushstring(L, "invalid-resource");
                return 2;
        }
        lua_pushboolean(L, 1);
@@ -418,9 +479,13 @@ int luaopen_util_pposix(lua_State *L)
 
        lua_pushcfunction(L, lc_getuid);
        lua_setfield(L, -2, "getuid");
+       lua_pushcfunction(L, lc_getgid);
+       lua_setfield(L, -2, "getgid");
 
        lua_pushcfunction(L, lc_setuid);
        lua_setfield(L, -2, "setuid");
+       lua_pushcfunction(L, lc_setgid);
+       lua_setfield(L, -2, "setgid");
        
        lua_pushcfunction(L, lc_setrlimit);
        lua_setfield(L, -2, "setrlimit");