diff options
Diffstat (limited to 'libraries/librewrite/session.c')
| -rw-r--r-- | libraries/librewrite/session.c | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/libraries/librewrite/session.c b/libraries/librewrite/session.c new file mode 100644 index 0000000..f766159 --- /dev/null +++ b/libraries/librewrite/session.c @@ -0,0 +1,427 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2000-2022 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ +/* ACKNOWLEDGEMENT: + * This work was initially developed by Pierangelo Masarati for + * inclusion in OpenLDAP Software. + */ + +#include <portable.h> + +#include "rewrite-int.h" + +/* + * Compares two cookies + */ +static int +rewrite_cookie_cmp( + const void *c1, + const void *c2 +) +{ + const struct rewrite_session *s1, *s2; + + s1 = ( const struct rewrite_session * )c1; + s2 = ( const struct rewrite_session * )c2; + + assert( s1 != NULL ); + assert( s2 != NULL ); + assert( s1->ls_cookie != NULL ); + assert( s2->ls_cookie != NULL ); + + return ( ( s1->ls_cookie < s2->ls_cookie ) ? -1 : + ( ( s1->ls_cookie > s2->ls_cookie ) ? 1 : 0 ) ); +} + +/* + * Duplicate cookies? + */ +static int +rewrite_cookie_dup( + void *c1, + void *c2 +) +{ + struct rewrite_session *s1, *s2; + + s1 = ( struct rewrite_session * )c1; + s2 = ( struct rewrite_session * )c2; + + assert( s1 != NULL ); + assert( s2 != NULL ); + assert( s1->ls_cookie != NULL ); + assert( s2->ls_cookie != NULL ); + + assert( s1->ls_cookie != s2->ls_cookie ); + + return ( ( s1->ls_cookie == s2->ls_cookie ) ? -1 : 0 ); +} + +/* + * Inits a session + */ +struct rewrite_session * +rewrite_session_init( + struct rewrite_info *info, + const void *cookie +) +{ + struct rewrite_session *session, tmp; + int rc; + + assert( info != NULL ); + assert( cookie != NULL ); + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + tmp.ls_cookie = ( void * )cookie; + session = ( struct rewrite_session * )ldap_avl_find( info->li_cookies, + ( caddr_t )&tmp, rewrite_cookie_cmp ); + if ( session ) { + session->ls_count++; +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + return session; + } + + session = calloc( sizeof( struct rewrite_session ), 1 ); + if ( session == NULL ) { +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + return NULL; + } + session->ls_cookie = ( void * )cookie; + session->ls_count = 1; + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + if ( ldap_pvt_thread_mutex_init( &session->ls_mutex ) ) { + free( session ); + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); + return NULL; + } + if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) { + ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); + free( session ); + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); + return NULL; + } +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + rc = ldap_avl_insert( &info->li_cookies, ( caddr_t )session, + rewrite_cookie_cmp, rewrite_cookie_dup ); + info->li_num_cookies++; + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + if ( rc != 0 ) { +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); + ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + free( session ); + return NULL; + } + + return session; +} + +/* + * Fetches a session + */ +struct rewrite_session * +rewrite_session_find( + struct rewrite_info *info, + const void *cookie +) +{ + struct rewrite_session *session, tmp; + + assert( info != NULL ); + assert( cookie != NULL ); + + tmp.ls_cookie = ( void * )cookie; +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + session = ( struct rewrite_session * )ldap_avl_find( info->li_cookies, + ( caddr_t )&tmp, rewrite_cookie_cmp ); +#ifdef USE_REWRITE_LDAP_PVT_THREADS + if ( session ) { + ldap_pvt_thread_mutex_lock( &session->ls_mutex ); + session->ls_count++; + } + ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + return session; +} + +/* + * Returns a session + */ +void +rewrite_session_return( + struct rewrite_info *info, + struct rewrite_session *session +) +{ + assert( session != NULL ); + session->ls_count--; +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ +} + +/* + * Defines and inits a var with session scope + */ +int +rewrite_session_var_set_f( + struct rewrite_info *info, + const void *cookie, + const char *name, + const char *value, + int flags +) +{ + struct rewrite_session *session; + struct rewrite_var *var; + + assert( info != NULL ); + assert( cookie != NULL ); + assert( name != NULL ); + assert( value != NULL ); + + session = rewrite_session_find( info, cookie ); + if ( session == NULL ) { + session = rewrite_session_init( info, cookie ); + if ( session == NULL ) { + return REWRITE_ERR; + } + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_mutex_lock( &session->ls_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + } + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + var = rewrite_var_find( session->ls_vars, name ); + if ( var != NULL ) { + assert( var->lv_value.bv_val != NULL ); + + (void)rewrite_var_replace( var, value, flags ); + + } else { + var = rewrite_var_insert_f( &session->ls_vars, name, value, flags ); + if ( var == NULL ) { +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + rewrite_session_return( info, session ); + return REWRITE_ERR; + } + } + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + rewrite_session_return( info, session ); + + return REWRITE_SUCCESS; +} + +/* + * Gets a var with session scope + */ +int +rewrite_session_var_get( + struct rewrite_info *info, + const void *cookie, + const char *name, + struct berval *value +) +{ + struct rewrite_session *session; + struct rewrite_var *var; + int rc = REWRITE_SUCCESS; + + assert( info != NULL ); + assert( cookie != NULL ); + assert( name != NULL ); + assert( value != NULL ); + + value->bv_val = NULL; + value->bv_len = 0; + + if ( cookie == NULL ) { + return REWRITE_ERR; + } + + session = rewrite_session_find( info, cookie ); + if ( session == NULL ) { + return REWRITE_ERR; + } + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + var = rewrite_var_find( session->ls_vars, name ); + if ( var != NULL ) { + value->bv_val = strdup( var->lv_value.bv_val ); + value->bv_len = var->lv_value.bv_len; + } + + if ( var == NULL || value->bv_val == NULL ) { + rc = REWRITE_ERR; + } + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + rewrite_session_return( info, session ); + + return rc; +} + +static void +rewrite_session_clean( void *v_session ) +{ + struct rewrite_session *session = (struct rewrite_session *)v_session; + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + rewrite_var_delete( session->ls_vars ); + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); + ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); + ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); + ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ +} + +static void +rewrite_session_free( void *v_session ) +{ + struct rewrite_session *session = (struct rewrite_session *)v_session; + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_mutex_lock( &session->ls_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + rewrite_session_clean( v_session ); + free( v_session ); +} + +/* + * Deletes a session + */ +int +rewrite_session_delete( + struct rewrite_info *info, + const void *cookie +) +{ + struct rewrite_session *session, tmp = { 0 }; + + assert( info != NULL ); + assert( cookie != NULL ); + + session = rewrite_session_find( info, cookie ); + + if ( session == NULL ) { + return REWRITE_SUCCESS; + } + + if ( --session->ls_count > 0 ) { + rewrite_session_return( info, session ); + return REWRITE_SUCCESS; + } + + rewrite_session_clean( session ); + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + assert( info->li_num_cookies > 0 ); + info->li_num_cookies--; + + /* + * There is nothing to delete in the return value + */ + tmp.ls_cookie = ( void * )cookie; + ldap_avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp ); + + free( session ); + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + return REWRITE_SUCCESS; +} + +/* + * Destroys the cookie tree + */ +int +rewrite_session_destroy( + struct rewrite_info *info +) +{ + int count; + + assert( info != NULL ); + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + /* + * Should call per-session destruction routine ... + */ + + count = ldap_avl_free( info->li_cookies, rewrite_session_free ); + info->li_cookies = NULL; + +#if 0 + fprintf( stderr, "count = %d; num_cookies = %d\n", + count, info->li_num_cookies ); +#endif + + assert( count == info->li_num_cookies ); + info->li_num_cookies = 0; + +#ifdef USE_REWRITE_LDAP_PVT_THREADS + ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); +#endif /* USE_REWRITE_LDAP_PVT_THREADS */ + + return REWRITE_SUCCESS; +} + |