X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=util-src%2Fpposix.c;h=9627dab782ff190e5a93666bece697497df4032e;hb=777d136ac74ee853d109a6ed3bc43d6fd4d7f4ba;hp=efb777b7561e9f8747740364fd3dc65fd1be2daf;hpb=9346c6b83540ead7deea2040de63c6c07598f0dd;p=prosody.git diff --git a/util-src/pposix.c b/util-src/pposix.c index efb777b7..9627dab7 100644 --- a/util-src/pposix.c +++ b/util-src/pposix.c @@ -1,7 +1,8 @@ -/* Prosody IM v0.3 +/* Prosody IM v0.4 -- Copyright (C) 2008-2009 Matthew Wild -- Copyright (C) 2008-2009 Waqas Hussain --- +-- Copyright (C) 2009 Tobias Markmann +-- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- @@ -12,19 +13,23 @@ * POSIX support functions for Lua */ -#define MODULE_VERSION "0.3.0" +#define MODULE_VERSION "0.3.2" #include +#include #include #include +#include #include #include #include #include +#include +#include #include - +#include #include "lua.h" #include "lauxlib.h" @@ -34,14 +39,14 @@ static int lc_daemonize(lua_State *L) { pid_t pid; - + if ( getppid() == 1 ) { lua_pushboolean(L, 0); lua_pushstring(L, "already-daemonized"); return 2; } - + /* Attempt initial fork */ if((pid = fork()) < 0) { @@ -57,7 +62,7 @@ static int lc_daemonize(lua_State *L) lua_pushnumber(L, pid); return 2; } - + /* and we are the child process */ if(setsid() == -1) { @@ -69,10 +74,10 @@ 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); @@ -87,10 +92,14 @@ static int lc_daemonize(lua_State *L) const char * const facility_strings[] = { "auth", +#if !(defined(sun) || defined(__sun)) "authpriv", +#endif "cron", "daemon", +#if !(defined(sun) || defined(__sun)) "ftp", +#endif "kern", "local0", "local1", @@ -109,10 +118,14 @@ const char * const facility_strings[] = { }; int facility_constants[] = { LOG_AUTH, +#if !(defined(sun) || defined(__sun)) LOG_AUTHPRIV, +#endif LOG_CRON, LOG_DAEMON, +#if !(defined(sun) || defined(__sun)) LOG_FTP, +#endif LOG_KERN, LOG_LOCAL0, LOG_LOCAL1, @@ -138,7 +151,7 @@ int facility_constants[] = { exist, the results are undefined. Most portable is to use a string constant. " -- syslog manpage -*/ +*/ char* syslog_ident = NULL; int lc_syslog_open(lua_State* L) @@ -147,12 +160,12 @@ int lc_syslog_open(lua_State* L) facility = facility_constants[facility]; luaL_checkstring(L, 1); - + if(syslog_ident) free(syslog_ident); - + syslog_ident = strdup(lua_tostring(L, 1)); - + openlog(syslog_ident, LOG_PID, facility); return 0; } @@ -170,7 +183,7 @@ int level_constants[] = { LOG_INFO, LOG_NOTICE, LOG_WARNING, - LOG_EMERG, + LOG_CRIT, -1 }; int lc_syslog_log(lua_State* L) @@ -216,35 +229,312 @@ int lc_getpid(lua_State* L) return 1; } +/* UID/GID functions */ + +int lc_getuid(lua_State* L) +{ + lua_pushinteger(L, getuid()); + return 1; +} + +int lc_getgid(lua_State* L) +{ + lua_pushinteger(L, getgid()); + return 1; +} + +int lc_setuid(lua_State* L) +{ + int uid = -1; + if(lua_gettop(L) < 1) + return 0; + if(!lua_isnumber(L, 1) && lua_tostring(L, 1)) + { + /* Passed UID is actually a string, so look up the UID */ + struct passwd *p; + p = getpwnam(lua_tostring(L, 1)); + if(!p) + { + lua_pushboolean(L, 0); + lua_pushstring(L, "no-such-user"); + return 2; + } + uid = p->pw_uid; + } + else + { + uid = lua_tonumber(L, 1); + } + + if(uid>-1) + { + /* Ok, attempt setuid */ + errno = 0; + if(setuid(uid)) + { + /* Fail */ + lua_pushboolean(L, 0); + switch(errno) + { + case EINVAL: + lua_pushstring(L, "invalid-uid"); + 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 UID to switch to */ + lua_pushboolean(L, 0); + lua_pushstring(L, "invalid-uid"); + 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; +} + +int lc_umask(lua_State* L) +{ + char old_mode_string[7]; + mode_t old_mode = umask(strtoul(luaL_checkstring(L, 1), NULL, 8)); + + snprintf(old_mode_string, sizeof(old_mode_string), "%03o", old_mode); + old_mode_string[sizeof(old_mode_string)-1] = 0; + lua_pushstring(L, old_mode_string); + + return 1; +} + +int lc_mkdir(lua_State* L) +{ + int ret = mkdir(luaL_checkstring(L, 1), S_IRUSR | S_IWUSR | S_IXUSR + | S_IRGRP | S_IWGRP | S_IXGRP + | S_IROTH | S_IXOTH); /* mode 775 */ + + lua_pushboolean(L, ret==0); + if(ret) + { + lua_pushstring(L, strerror(errno)); + return 2; + } + return 1; +} + +/* Like POSIX's setrlimit()/getrlimit() API functions. + * + * Syntax: + * pposix.setrlimit( resource, soft limit, hard limit) + * + * Any negative limit will be replace with the current limit by an additional call of getrlimit(). + * + * Example usage: + * pposix.setrlimit("NOFILE", 1000, 2000) + */ +int string2resource(const char *s) { + if (!strcmp(s, "CORE")) return RLIMIT_CORE; + if (!strcmp(s, "CPU")) return RLIMIT_CPU; + if (!strcmp(s, "DATA")) return RLIMIT_DATA; + if (!strcmp(s, "FSIZE")) return RLIMIT_FSIZE; + if (!strcmp(s, "NOFILE")) return RLIMIT_NOFILE; + if (!strcmp(s, "STACK")) return RLIMIT_STACK; +#if !(defined(sun) || defined(__sun)) + if (!strcmp(s, "MEMLOCK")) return RLIMIT_MEMLOCK; + if (!strcmp(s, "NPROC")) return RLIMIT_NPROC; + if (!strcmp(s, "RSS")) return RLIMIT_RSS; +#endif + return -1; +} + +int lc_setrlimit(lua_State *L) { + int arguments = lua_gettop(L); + int softlimit = -1; + int hardlimit = -1; + const char *resource = NULL; + int rid = -1; + if(arguments < 1 || arguments > 3) { + lua_pushboolean(L, 0); + lua_pushstring(L, "incorrect-arguments"); + } + + resource = luaL_checkstring(L, 1); + softlimit = luaL_checkinteger(L, 2); + hardlimit = luaL_checkinteger(L, 3); + + rid = string2resource(resource); + if (rid != -1) { + struct rlimit lim; + struct rlimit lim_current; + + if (softlimit < 0 || hardlimit < 0) { + if (getrlimit(rid, &lim_current)) { + lua_pushboolean(L, 0); + lua_pushstring(L, "getrlimit-failed"); + return 2; + } + } + + if (softlimit < 0) lim.rlim_cur = lim_current.rlim_cur; + else lim.rlim_cur = softlimit; + if (hardlimit < 0) lim.rlim_max = lim_current.rlim_max; + else lim.rlim_max = hardlimit; + + if (setrlimit(rid, &lim)) { + lua_pushboolean(L, 0); + 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, "invalid-resource"); + return 2; + } + lua_pushboolean(L, 1); + return 1; +} + +int lc_getrlimit(lua_State *L) { + int arguments = lua_gettop(L); + const char *resource = NULL; + int rid = -1; + struct rlimit lim; + + if (arguments != 1) { + lua_pushboolean(L, 0); + lua_pushstring(L, "invalid-arguments"); + return 2; + } + + resource = luaL_checkstring(L, 1); + rid = string2resource(resource); + if (rid != -1) { + if (getrlimit(rid, &lim)) { + lua_pushboolean(L, 0); + 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, "invalid-resource"); + return 2; + } + lua_pushboolean(L, 1); + lua_pushnumber(L, lim.rlim_cur); + lua_pushnumber(L, lim.rlim_max); + return 3; +} + +int lc_abort(lua_State* L) +{ + abort(); + return 0; +} + /* Register functions */ int luaopen_util_pposix(lua_State *L) { - lua_newtable(L); + luaL_Reg exports[] = { + { "abort", lc_abort }, + + { "daemonize", lc_daemonize }, + + { "syslog_open", lc_syslog_open }, + { "syslog_close", lc_syslog_close }, + { "syslog_log", lc_syslog_log }, + { "syslog_setminlevel", lc_syslog_setmask }, - lua_pushcfunction(L, lc_daemonize); - lua_setfield(L, -2, "daemonize"); + { "getpid", lc_getpid }, + { "getuid", lc_getuid }, + { "getgid", lc_getgid }, - lua_pushcfunction(L, lc_syslog_open); - lua_setfield(L, -2, "syslog_open"); + { "setuid", lc_setuid }, + { "setgid", lc_setgid }, - lua_pushcfunction(L, lc_syslog_close); - lua_setfield(L, -2, "syslog_close"); + { "umask", lc_umask }, - lua_pushcfunction(L, lc_syslog_log); - lua_setfield(L, -2, "syslog_log"); + { "mkdir", lc_mkdir }, - lua_pushcfunction(L, lc_syslog_setmask); - lua_setfield(L, -2, "syslog_setminlevel"); + { "setrlimit", lc_setrlimit }, + { "getrlimit", lc_getrlimit }, - lua_pushcfunction(L, lc_getpid); - lua_setfield(L, -2, "getpid"); + { NULL, NULL } + }; + + luaL_register(L, "pposix", exports); lua_pushliteral(L, "pposix"); lua_setfield(L, -2, "_NAME"); lua_pushliteral(L, MODULE_VERSION); lua_setfield(L, -2, "_VERSION"); - + return 1; };