/* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 1998-2015 The OpenLDAP Foundation. * Portions Copyright 2007 by Howard Chu, Symas Corporation. * 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 * . */ /* Portions Copyright (c) 1995 Regents of the University of Michigan. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and that due credit is given * to the University of Michigan at Ann Arbor. The name of the University * may not be used to endorse or promote products derived from this * software without specific prior written permission. This software * is provided ``as is'' without express or implied warranty. */ #include "portable.h" #include #include #include #include #include #include #include #include #include #include #include "lload.h" #include "ldap_pvt_thread.h" #include "lutil.h" #include "ldap_rq.h" #ifdef LDAP_PF_LOCAL #include /* this should go in as soon as it is accepted */ #define LDAPI_MOD_URLEXT "x-mod" #endif /* LDAP_PF_LOCAL */ #ifndef BALANCER_MODULE #ifdef LDAP_PF_INET6 int slap_inet4or6 = AF_UNSPEC; #else /* ! INETv6 */ int slap_inet4or6 = AF_INET; #endif /* ! INETv6 */ /* globals */ time_t starttime; struct runqueue_s slapd_rq; #ifdef LDAP_TCP_BUFFER int slapd_tcp_rmem; int slapd_tcp_wmem; #endif /* LDAP_TCP_BUFFER */ volatile sig_atomic_t slapd_shutdown = 0; volatile sig_atomic_t slapd_gentle_shutdown = 0; volatile sig_atomic_t slapd_abrupt_shutdown = 0; #endif /* !BALANCER_MODULE */ static int emfile; ldap_pvt_thread_mutex_t lload_wait_mutex; ldap_pvt_thread_cond_t lload_wait_cond; ldap_pvt_thread_cond_t lload_pause_cond; #ifndef SLAPD_MAX_DAEMON_THREADS #define SLAPD_MAX_DAEMON_THREADS 16 #endif int lload_daemon_threads = 1; int lload_daemon_mask; struct event_base *listener_base = NULL; LloadListener **lload_listeners = NULL; static ldap_pvt_thread_t listener_tid, *daemon_tid; struct event_base *daemon_base = NULL; struct evdns_base *dnsbase; struct event *lload_timeout_event; /* * global lload statistics. Not mutex protected to preserve performance - * increment is atomic, at most we risk a bit of inconsistency */ lload_global_stats_t lload_stats = {}; #ifndef SLAPD_LISTEN_BACKLOG #define SLAPD_LISTEN_BACKLOG 1024 #endif /* ! SLAPD_LISTEN_BACKLOG */ #define DAEMON_ID(fd) ( fd & lload_daemon_mask ) #ifdef HAVE_WINSOCK ldap_pvt_thread_mutex_t slapd_ws_mutex; SOCKET *slapd_ws_sockets; #define SD_READ 1 #define SD_WRITE 2 #define SD_ACTIVE 4 #define SD_LISTENER 8 #endif #ifdef HAVE_TCPD static ldap_pvt_thread_mutex_t sd_tcpd_mutex; #endif /* TCP Wrappers */ typedef struct listener_item { struct evconnlistener *listener; ber_socket_t fd; } listener_item; typedef struct lload_daemon_st { ldap_pvt_thread_mutex_t sd_mutex; struct event_base *base; struct event *wakeup_event; } lload_daemon_st; static lload_daemon_st lload_daemon[SLAPD_MAX_DAEMON_THREADS]; static void daemon_wakeup_cb( evutil_socket_t sig, short what, void *arg ); static void lloadd_close( ber_socket_t s ) { Debug( LDAP_DEBUG_CONNS, "lloadd_close: " "closing fd=%ld\n", (long)s ); tcp_close( s ); } static void lload_free_listener_addresses( struct sockaddr **sal ) { struct sockaddr **sap; if ( sal == NULL ) return; for ( sap = sal; *sap != NULL; sap++ ) ch_free(*sap); ch_free( sal ); } #if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD) static int get_url_perms( char **exts, mode_t *perms, int *crit ) { int i; assert( exts != NULL ); assert( perms != NULL ); assert( crit != NULL ); *crit = 0; for ( i = 0; exts[i]; i++ ) { char *type = exts[i]; int c = 0; if ( type[0] == '!' ) { c = 1; type++; } if ( strncasecmp( type, LDAPI_MOD_URLEXT "=", sizeof(LDAPI_MOD_URLEXT "=") - 1 ) == 0 ) { char *value = type + ( sizeof(LDAPI_MOD_URLEXT "=") - 1 ); mode_t p = 0; int j; switch ( strlen( value ) ) { case 4: /* skip leading '0' */ if ( value[0] != '0' ) return LDAP_OTHER; value++; case 3: for ( j = 0; j < 3; j++ ) { int v; v = value[j] - '0'; if ( v < 0 || v > 7 ) return LDAP_OTHER; p |= v << 3 * ( 2 - j ); } break; case 10: for ( j = 1; j < 10; j++ ) { static mode_t m[] = { 0, S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IWGRP, S_IXGRP, S_IROTH, S_IWOTH, S_IXOTH }; static const char c[] = "-rwxrwxrwx"; if ( value[j] == c[j] ) { p |= m[j]; } else if ( value[j] != '-' ) { return LDAP_OTHER; } } break; default: return LDAP_OTHER; } *crit = c; *perms = p; return LDAP_SUCCESS; } } return LDAP_OTHER; } #endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */ /* port = 0 indicates AF_LOCAL */ static int lload_get_listener_addresses( const char *host, unsigned short port, struct sockaddr ***sal ) { struct sockaddr **sap; #ifdef LDAP_PF_LOCAL if ( port == 0 ) { sap = *sal = ch_malloc( 2 * sizeof(void *) ); *sap = ch_calloc( 1, sizeof(struct sockaddr_un) ); sap[1] = NULL; if ( strlen( host ) > ( sizeof( ((struct sockaddr_un *)*sap)->sun_path ) - 1 ) ) { Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: " "domain socket path (%s) too long in URL\n", host ); goto errexit; } (*sap)->sa_family = AF_LOCAL; strcpy( ((struct sockaddr_un *)*sap)->sun_path, host ); } else #endif /* LDAP_PF_LOCAL */ { #ifdef HAVE_GETADDRINFO struct addrinfo hints, *res, *sai; int n, err; char serv[7]; memset( &hints, '\0', sizeof(hints) ); hints.ai_flags = AI_PASSIVE; hints.ai_socktype = SOCK_STREAM; hints.ai_family = slap_inet4or6; snprintf( serv, sizeof(serv), "%d", port ); if ( (err = getaddrinfo( host, serv, &hints, &res )) ) { Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: " "getaddrinfo() failed: %s\n", AC_GAI_STRERROR(err) ); return -1; } sai = res; for ( n = 2; ( sai = sai->ai_next ) != NULL; n++ ) { /* EMPTY */; } sap = *sal = ch_calloc( n, sizeof(void *) ); *sap = NULL; for ( sai = res; sai; sai = sai->ai_next ) { if ( sai->ai_addr == NULL ) { Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: " "getaddrinfo ai_addr is NULL?\n" ); freeaddrinfo( res ); goto errexit; } switch ( sai->ai_family ) { #ifdef LDAP_PF_INET6 case AF_INET6: *sap = ch_malloc( sizeof(struct sockaddr_in6) ); *(struct sockaddr_in6 *)*sap = *((struct sockaddr_in6 *)sai->ai_addr); break; #endif /* LDAP_PF_INET6 */ case AF_INET: *sap = ch_malloc( sizeof(struct sockaddr_in) ); *(struct sockaddr_in *)*sap = *((struct sockaddr_in *)sai->ai_addr); break; default: *sap = NULL; break; } if ( *sap != NULL ) { (*sap)->sa_family = sai->ai_family; sap++; *sap = NULL; } } freeaddrinfo( res ); #else /* ! HAVE_GETADDRINFO */ int i, n = 1; struct in_addr in; struct hostent *he = NULL; if ( host == NULL ) { in.s_addr = htonl( INADDR_ANY ); } else if ( !inet_aton( host, &in ) ) { he = gethostbyname( host ); if ( he == NULL ) { Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: " "invalid host %s\n", host ); return -1; } for ( n = 0; he->h_addr_list[n]; n++ ) /* empty */; } sap = *sal = ch_malloc( ( n + 1 ) * sizeof(void *) ); for ( i = 0; i < n; i++ ) { sap[i] = ch_calloc( 1, sizeof(struct sockaddr_in) ); sap[i]->sa_family = AF_INET; ((struct sockaddr_in *)sap[i])->sin_port = htons( port ); AC_MEMCPY( &((struct sockaddr_in *)sap[i])->sin_addr, he ? (struct in_addr *)he->h_addr_list[i] : &in, sizeof(struct in_addr) ); } sap[i] = NULL; #endif /* ! HAVE_GETADDRINFO */ } return 0; errexit: lload_free_listener_addresses(*sal); return -1; } static int lload_open_listener( const char *url, LDAPURLDesc *lud, int *listeners, int *cur ) { int num, tmp, rc; LloadListener l; LloadListener *li; unsigned short port; int err, addrlen = 0; struct sockaddr **sal = NULL, **psal; int socktype = SOCK_STREAM; /* default to COTS */ ber_socket_t s; char ebuf[128]; #if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD) /* * use safe defaults */ int crit = 1; #endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */ assert( url ); assert( lud ); l.sl_url.bv_val = NULL; l.sl_mute = 0; l.sl_busy = 0; #ifndef HAVE_TLS if ( ldap_pvt_url_scheme2tls( lud->lud_scheme ) ) { Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "TLS not supported (%s)\n", url ); ldap_free_urldesc( lud ); return -1; } if ( !lud->lud_port ) lud->lud_port = LDAP_PORT; #else /* HAVE_TLS */ l.sl_is_tls = ldap_pvt_url_scheme2tls( lud->lud_scheme ); #endif /* HAVE_TLS */ #ifdef LDAP_TCP_BUFFER l.sl_tcp_rmem = 0; l.sl_tcp_wmem = 0; #endif /* LDAP_TCP_BUFFER */ port = (unsigned short)lud->lud_port; tmp = ldap_pvt_url_scheme2proto( lud->lud_scheme ); if ( tmp == LDAP_PROTO_IPC ) { #ifdef LDAP_PF_LOCAL if ( lud->lud_host == NULL || lud->lud_host[0] == '\0' ) { err = lload_get_listener_addresses( LDAPI_SOCK, 0, &sal ); } else { err = lload_get_listener_addresses( lud->lud_host, 0, &sal ); } #else /* ! LDAP_PF_LOCAL */ Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "URL scheme not supported: %s\n", url ); ldap_free_urldesc( lud ); return -1; #endif /* ! LDAP_PF_LOCAL */ } else { if ( lud->lud_host == NULL || lud->lud_host[0] == '\0' || strcmp( lud->lud_host, "*" ) == 0 ) { err = lload_get_listener_addresses( NULL, port, &sal ); } else { err = lload_get_listener_addresses( lud->lud_host, port, &sal ); } } #if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD) if ( lud->lud_exts ) { err = get_url_perms( lud->lud_exts, &l.sl_perms, &crit ); } else { l.sl_perms = S_IRWXU | S_IRWXO; } #endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */ ldap_free_urldesc( lud ); if ( err ) { lload_free_listener_addresses( sal ); return -1; } /* If we got more than one address returned, we need to make space * for it in the lload_listeners array. */ for ( num = 0; sal[num]; num++ ) /* empty */; if ( num > 1 ) { *listeners += num - 1; lload_listeners = ch_realloc( lload_listeners, ( *listeners + 1 ) * sizeof(LloadListener *) ); } psal = sal; while ( *sal != NULL ) { char *af; switch ( (*sal)->sa_family ) { case AF_INET: af = "IPv4"; break; #ifdef LDAP_PF_INET6 case AF_INET6: af = "IPv6"; break; #endif /* LDAP_PF_INET6 */ #ifdef LDAP_PF_LOCAL case AF_LOCAL: af = "Local"; break; #endif /* LDAP_PF_LOCAL */ default: sal++; continue; } s = socket( (*sal)->sa_family, socktype, 0 ); if ( s == AC_SOCKET_INVALID ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "%s socket() failed errno=%d (%s)\n", af, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); sal++; continue; } ber_pvt_socket_set_nonblock( s, 1 ); l.sl_sd = s; #ifdef LDAP_PF_LOCAL if ( (*sal)->sa_family == AF_LOCAL ) { unlink( ((struct sockaddr_un *)*sal)->sun_path ); } else #endif /* LDAP_PF_LOCAL */ { #ifdef SO_REUSEADDR /* enable address reuse */ tmp = 1; rc = setsockopt( s, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp) ); if ( rc == AC_SOCKET_ERROR ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_open_listener(%ld): " "setsockopt(SO_REUSEADDR) failed errno=%d (%s)\n", (long)l.sl_sd, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } #endif /* SO_REUSEADDR */ } switch ( (*sal)->sa_family ) { case AF_INET: addrlen = sizeof(struct sockaddr_in); break; #ifdef LDAP_PF_INET6 case AF_INET6: #ifdef IPV6_V6ONLY /* Try to use IPv6 sockets for IPv6 only */ tmp = 1; rc = setsockopt( s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&tmp, sizeof(tmp) ); if ( rc == AC_SOCKET_ERROR ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_open_listener(%ld): " "setsockopt(IPV6_V6ONLY) failed errno=%d (%s)\n", (long)l.sl_sd, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } #endif /* IPV6_V6ONLY */ addrlen = sizeof(struct sockaddr_in6); break; #endif /* LDAP_PF_INET6 */ #ifdef LDAP_PF_LOCAL case AF_LOCAL: #ifdef LOCAL_CREDS { int one = 1; setsockopt( s, 0, LOCAL_CREDS, &one, sizeof(one) ); } #endif /* LOCAL_CREDS */ addrlen = sizeof(struct sockaddr_un); break; #endif /* LDAP_PF_LOCAL */ } #ifdef LDAP_PF_LOCAL /* create socket with all permissions set for those systems * that honor permissions on sockets (e.g. Linux); typically, * only write is required. To exploit filesystem permissions, * place the socket in a directory and use directory's * permissions. Need write perms to the directory to * create/unlink the socket; likely need exec perms to access * the socket (ITS#4709) */ { mode_t old_umask = 0; if ( (*sal)->sa_family == AF_LOCAL ) { old_umask = umask( 0 ); } #endif /* LDAP_PF_LOCAL */ rc = bind( s, *sal, addrlen ); #ifdef LDAP_PF_LOCAL if ( old_umask != 0 ) { umask( old_umask ); } } #endif /* LDAP_PF_LOCAL */ if ( rc ) { err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "bind(%ld) failed errno=%d (%s)\n", (long)l.sl_sd, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); tcp_close( s ); sal++; continue; } switch ( (*sal)->sa_family ) { #ifdef LDAP_PF_LOCAL case AF_LOCAL: { char *path = ((struct sockaddr_un *)*sal)->sun_path; l.sl_name.bv_len = strlen( path ) + STRLENOF("PATH="); l.sl_name.bv_val = ch_malloc( l.sl_name.bv_len + 1 ); snprintf( l.sl_name.bv_val, l.sl_name.bv_len + 1, "PATH=%s", path ); } break; #endif /* LDAP_PF_LOCAL */ case AF_INET: { char addr[INET_ADDRSTRLEN]; const char *s; #if defined(HAVE_GETADDRINFO) && defined(HAVE_INET_NTOP) s = inet_ntop( AF_INET, &((struct sockaddr_in *)*sal)->sin_addr, addr, sizeof(addr) ); #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ s = inet_ntoa( ((struct sockaddr_in *)*sal)->sin_addr ); #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ if ( !s ) s = SLAP_STRING_UNKNOWN; port = ntohs( ((struct sockaddr_in *)*sal)->sin_port ); l.sl_name.bv_val = ch_malloc( sizeof("IP=255.255.255.255:65535") ); snprintf( l.sl_name.bv_val, sizeof("IP=255.255.255.255:65535"), "IP=%s:%d", s, port ); l.sl_name.bv_len = strlen( l.sl_name.bv_val ); } break; #ifdef LDAP_PF_INET6 case AF_INET6: { char addr[INET6_ADDRSTRLEN]; const char *s; s = inet_ntop( AF_INET6, &((struct sockaddr_in6 *)*sal)->sin6_addr, addr, sizeof(addr) ); if ( !s ) s = SLAP_STRING_UNKNOWN; port = ntohs( ((struct sockaddr_in6 *)*sal)->sin6_port ); l.sl_name.bv_len = strlen( s ) + sizeof("IP=[]:65535"); l.sl_name.bv_val = ch_malloc( l.sl_name.bv_len ); snprintf( l.sl_name.bv_val, l.sl_name.bv_len, "IP=[%s]:%d", s, port ); l.sl_name.bv_len = strlen( l.sl_name.bv_val ); } break; #endif /* LDAP_PF_INET6 */ default: Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "unsupported address family (%d)\n", (int)(*sal)->sa_family ); break; } AC_MEMCPY( &l.sl_sa, *sal, addrlen ); ber_str2bv( url, 0, 1, &l.sl_url ); li = ch_malloc( sizeof(LloadListener) ); *li = l; lload_listeners[*cur] = li; (*cur)++; sal++; } lload_free_listener_addresses( psal ); if ( l.sl_url.bv_val == NULL ) { Debug( LDAP_DEBUG_ANY, "lload_open_listener: " "failed on %s\n", url ); return -1; } Debug( LDAP_DEBUG_TRACE, "lload_open_listener: " "listener initialized %s\n", l.sl_url.bv_val ); return 0; } int lload_open_new_listener( const char *url, LDAPURLDesc *lud ) { int rc, i, j = 0; for ( i = 0; lload_listeners && lload_listeners[i] != NULL; i++ ) /* count */ ; j = i; i++; lload_listeners = ch_realloc( lload_listeners, ( i + 1 ) * sizeof(LloadListener *) ); rc = lload_open_listener( url, lud, &i, &j ); lload_listeners[j] = NULL; return rc; } int lloadd_inited = 0; int lloadd_listeners_init( const char *urls ) { int i, j, n; char **u; LDAPURLDesc *lud; Debug( LDAP_DEBUG_ARGS, "lloadd_listeners_init: %s\n", urls ? urls : "" ); #ifdef HAVE_TCPD ldap_pvt_thread_mutex_init( &sd_tcpd_mutex ); #endif /* TCP Wrappers */ if ( urls == NULL ) urls = "ldap:///"; u = ldap_str2charray( urls, " " ); if ( u == NULL || u[0] == NULL ) { Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: " "no urls (%s) provided\n", urls ); if ( u ) ldap_charray_free( u ); return -1; } for ( i = 0; u[i] != NULL; i++ ) { Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: " "listen on %s\n", u[i] ); } if ( i == 0 ) { Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: " "no listeners to open (%s)\n", urls ); ldap_charray_free( u ); return -1; } Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: " "%d listeners to open...\n", i ); lload_listeners = ch_malloc( ( i + 1 ) * sizeof(LloadListener *) ); for ( n = 0, j = 0; u[n]; n++ ) { if ( ldap_url_parse_ext( u[n], &lud, LDAP_PVT_URL_PARSE_DEF_PORT ) ) { Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: " "could not parse url %s\n", u[n] ); ldap_charray_free( u ); return -1; } if ( lload_open_listener( u[n], lud, &i, &j ) ) { ldap_charray_free( u ); return -1; } } lload_listeners[j] = NULL; Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: " "%d listeners opened\n", i ); ldap_charray_free( u ); return !i; } int lloadd_daemon_destroy( void ) { epoch_shutdown(); if ( lloadd_inited ) { int i; for ( i = 0; i < lload_daemon_threads; i++ ) { ldap_pvt_thread_mutex_destroy( &lload_daemon[i].sd_mutex ); if ( lload_daemon[i].wakeup_event ) { event_free( lload_daemon[i].wakeup_event ); } if ( lload_daemon[i].base ) { event_base_free( lload_daemon[i].base ); } } event_base_free( daemon_base ); daemon_base = NULL; lloadd_inited = 0; #ifdef HAVE_TCPD ldap_pvt_thread_mutex_destroy( &sd_tcpd_mutex ); #endif /* TCP Wrappers */ } return 0; } static void destroy_listeners( void ) { LloadListener *lr, **ll = lload_listeners; if ( ll == NULL ) return; ldap_pvt_thread_join( listener_tid, (void *)NULL ); while ( (lr = *ll++) != NULL ) { if ( lr->sl_url.bv_val ) { ber_memfree( lr->sl_url.bv_val ); } if ( lr->sl_name.bv_val ) { ber_memfree( lr->sl_name.bv_val ); } #ifdef LDAP_PF_LOCAL if ( lr->sl_sa.sa_addr.sa_family == AF_LOCAL ) { unlink( lr->sl_sa.sa_un_addr.sun_path ); } #endif /* LDAP_PF_LOCAL */ evconnlistener_free( lr->listener ); free( lr ); } free( lload_listeners ); lload_listeners = NULL; if ( listener_base ) { event_base_free( listener_base ); } } static void lload_listener( struct evconnlistener *listener, ber_socket_t s, struct sockaddr *a, int len, void *arg ) { LloadListener *sl = arg; LloadConnection *c; Sockaddr *from = (Sockaddr *)a; #ifdef SLAPD_RLOOKUPS char hbuf[NI_MAXHOST]; #endif /* SLAPD_RLOOKUPS */ const char *peeraddr = NULL; /* we assume INET6_ADDRSTRLEN > INET_ADDRSTRLEN */ char addr[INET6_ADDRSTRLEN]; #ifdef LDAP_PF_LOCAL char peername[MAXPATHLEN + sizeof("PATH=")]; #ifdef LDAP_PF_LOCAL_SENDMSG char peerbuf[8]; struct berval peerbv = BER_BVNULL; #endif #elif defined(LDAP_PF_INET6) char peername[sizeof("IP=[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535")]; #else /* ! LDAP_PF_LOCAL && ! LDAP_PF_INET6 */ char peername[sizeof("IP=255.255.255.255:65336")]; #endif /* LDAP_PF_LOCAL */ int cflag; int tid; char ebuf[128]; Debug( LDAP_DEBUG_TRACE, ">>> lload_listener(%s)\n", sl->sl_url.bv_val ); peername[0] = '\0'; /* Resume the listener FD to allow concurrent-processing of * additional incoming connections. */ sl->sl_busy = 0; tid = DAEMON_ID(s); Debug( LDAP_DEBUG_CONNS, "lload_listener: " "listen=%ld, new connection fd=%ld\n", (long)sl->sl_sd, (long)s ); #if defined(SO_KEEPALIVE) || defined(TCP_NODELAY) #ifdef LDAP_PF_LOCAL /* for IPv4 and IPv6 sockets only */ if ( from->sa_addr.sa_family != AF_LOCAL ) #endif /* LDAP_PF_LOCAL */ { int rc; int tmp; #ifdef SO_KEEPALIVE /* enable keep alives */ tmp = 1; rc = setsockopt( s, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp) ); if ( rc == AC_SOCKET_ERROR ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener(%ld): " "setsockopt(SO_KEEPALIVE) failed errno=%d (%s)\n", (long)s, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } #endif /* SO_KEEPALIVE */ #ifdef TCP_NODELAY /* enable no delay */ tmp = 1; rc = setsockopt( s, IPPROTO_TCP, TCP_NODELAY, (char *)&tmp, sizeof(tmp) ); if ( rc == AC_SOCKET_ERROR ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener(%ld): " "setsockopt(TCP_NODELAY) failed errno=%d (%s)\n", (long)s, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } #endif /* TCP_NODELAY */ } #endif /* SO_KEEPALIVE || TCP_NODELAY */ cflag = 0; switch ( from->sa_addr.sa_family ) { #ifdef LDAP_PF_LOCAL case AF_LOCAL: cflag |= CONN_IS_IPC; /* FIXME: apparently accept doesn't fill the sun_path member */ sprintf( peername, "PATH=%s", sl->sl_sa.sa_un_addr.sun_path ); break; #endif /* LDAP_PF_LOCAL */ #ifdef LDAP_PF_INET6 case AF_INET6: if ( IN6_IS_ADDR_V4MAPPED( &from->sa_in6_addr.sin6_addr ) ) { #if defined(HAVE_GETADDRINFO) && defined(HAVE_INET_NTOP) peeraddr = inet_ntop( AF_INET, ( (struct in_addr *)&from->sa_in6_addr.sin6_addr .s6_addr[12] ), addr, sizeof(addr) ); #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ peeraddr = inet_ntoa( *( (struct in_addr *)&from->sa_in6_addr .sin6_addr.s6_addr[12] ) ); #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ if ( !peeraddr ) peeraddr = SLAP_STRING_UNKNOWN; sprintf( peername, "IP=%s:%d", peeraddr, (unsigned)ntohs( from->sa_in6_addr.sin6_port ) ); } else { peeraddr = inet_ntop( AF_INET6, &from->sa_in6_addr.sin6_addr, addr, sizeof(addr) ); if ( !peeraddr ) peeraddr = SLAP_STRING_UNKNOWN; sprintf( peername, "IP=[%s]:%d", peeraddr, (unsigned)ntohs( from->sa_in6_addr.sin6_port ) ); } break; #endif /* LDAP_PF_INET6 */ case AF_INET: { #if defined(HAVE_GETADDRINFO) && defined(HAVE_INET_NTOP) peeraddr = inet_ntop( AF_INET, &from->sa_in_addr.sin_addr, addr, sizeof(addr) ); #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ peeraddr = inet_ntoa( from->sa_in_addr.sin_addr ); #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */ if ( !peeraddr ) peeraddr = SLAP_STRING_UNKNOWN; sprintf( peername, "IP=%s:%d", peeraddr, (unsigned)ntohs( from->sa_in_addr.sin_port ) ); } break; default: lloadd_close( s ); return; } #ifdef HAVE_TLS if ( sl->sl_is_tls ) cflag |= CONN_IS_TLS; #endif c = client_init( s, sl, peername, lload_daemon[tid].base, cflag ); if ( !c ) { Debug( LDAP_DEBUG_ANY, "lload_listener: " "client_init(%ld, %s, %s) failed\n", (long)s, peername, sl->sl_name.bv_val ); lloadd_close( s ); } return; } static void * lload_listener_thread( void *ctx ) { int rc = event_base_dispatch( listener_base ); Debug( LDAP_DEBUG_ANY, "lload_listener_thread: " "event loop finished: rc=%d\n", rc ); return (void *)NULL; } static void listener_error_cb( struct evconnlistener *lev, void *arg ) { LloadListener *l = arg; int err = EVUTIL_SOCKET_ERROR(); assert( l->listener == lev ); if ( #ifdef EMFILE err == EMFILE || #endif /* EMFILE */ #ifdef ENFILE err == ENFILE || #endif /* ENFILE */ 0 ) { ldap_pvt_thread_mutex_lock( &lload_daemon[0].sd_mutex ); emfile++; /* Stop listening until an existing session closes */ l->sl_mute = 1; evconnlistener_disable( lev ); ldap_pvt_thread_mutex_unlock( &lload_daemon[0].sd_mutex ); Debug( LDAP_DEBUG_ANY, "listener_error_cb: " "too many open files, cannot accept new connections on " "url=%s\n", l->sl_url.bv_val ); } else { char ebuf[128]; Debug( LDAP_DEBUG_ANY, "listener_error_cb: " "received an error on a listener, shutting down: '%s'\n", sock_errstr( err, ebuf, sizeof(ebuf) ) ); event_base_loopexit( l->base, NULL ); } } void listeners_reactivate( void ) { int i; ldap_pvt_thread_mutex_lock( &lload_daemon[0].sd_mutex ); for ( i = 0; emfile && lload_listeners[i] != NULL; i++ ) { LloadListener *lr = lload_listeners[i]; if ( lr->sl_sd == AC_SOCKET_INVALID ) continue; if ( lr->sl_mute ) { emfile--; evconnlistener_enable( lr->listener ); lr->sl_mute = 0; Debug( LDAP_DEBUG_CONNS, "listeners_reactivate: " "reactivated listener url=%s\n", lr->sl_url.bv_val ); } } if ( emfile && lload_listeners[i] == NULL ) { /* Walked the entire list without enabling anything; emfile * counter is stale. Reset it. */ emfile = 0; } ldap_pvt_thread_mutex_unlock( &lload_daemon[0].sd_mutex ); } static int lload_listener_activate( void ) { struct evconnlistener *listener; int l, rc; char ebuf[128]; listener_base = event_base_new(); if ( !listener_base ) return -1; for ( l = 0; lload_listeners[l] != NULL; l++ ) { if ( lload_listeners[l]->sl_sd == AC_SOCKET_INVALID ) continue; /* FIXME: TCP-only! */ #ifdef LDAP_TCP_BUFFER if ( 1 ) { int origsize, size, realsize, rc; socklen_t optlen; size = 0; if ( lload_listeners[l]->sl_tcp_rmem > 0 ) { size = lload_listeners[l]->sl_tcp_rmem; } else if ( slapd_tcp_rmem > 0 ) { size = slapd_tcp_rmem; } if ( size > 0 ) { optlen = sizeof(origsize); rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_RCVBUF, (void *)&origsize, &optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "getsockopt(SO_RCVBUF) failed errno=%d (%s)\n", err, AC_STRERROR_R( err, ebuf, sizeof(ebuf) ) ); } optlen = sizeof(size); rc = setsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_RCVBUF, (const void *)&size, optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "setsockopt(SO_RCVBUF) failed errno=%d (%s)\n", err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } optlen = sizeof(realsize); rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_RCVBUF, (void *)&realsize, &optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "getsockopt(SO_RCVBUF) failed errno=%d (%s)\n", err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "url=%s (#%d) RCVBUF original size=%d requested " "size=%d real size=%d\n", lload_listeners[l]->sl_url.bv_val, l, origsize, size, realsize ); } size = 0; if ( lload_listeners[l]->sl_tcp_wmem > 0 ) { size = lload_listeners[l]->sl_tcp_wmem; } else if ( slapd_tcp_wmem > 0 ) { size = slapd_tcp_wmem; } if ( size > 0 ) { optlen = sizeof(origsize); rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_SNDBUF, (void *)&origsize, &optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "getsockopt(SO_SNDBUF) failed errno=%d (%s)\n", err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } optlen = sizeof(size); rc = setsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_SNDBUF, (const void *)&size, optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "setsockopt(SO_SNDBUF) failed errno=%d (%s)\n", err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } optlen = sizeof(realsize); rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET, SO_SNDBUF, (void *)&realsize, &optlen ); if ( rc ) { int err = sock_errno(); Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "getsockopt(SO_SNDBUF) failed errno=%d (%s)\n", err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); } Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "url=%s (#%d) SNDBUF original size=%d requested " "size=%d real size=%d\n", lload_listeners[l]->sl_url.bv_val, l, origsize, size, realsize ); } } #endif /* LDAP_TCP_BUFFER */ lload_listeners[l]->sl_busy = 1; listener = evconnlistener_new( listener_base, lload_listener, lload_listeners[l], LEV_OPT_THREADSAFE, SLAPD_LISTEN_BACKLOG, lload_listeners[l]->sl_sd ); if ( !listener ) { int err = sock_errno(); #ifdef LDAP_PF_INET6 /* If error is EADDRINUSE, we are trying to listen to INADDR_ANY and * we are already listening to in6addr_any, then we want to ignore * this and continue. */ if ( err == EADDRINUSE ) { int i; struct sockaddr_in sa = lload_listeners[l]->sl_sa.sa_in_addr; struct sockaddr_in6 sa6; if ( sa.sin_family == AF_INET && sa.sin_addr.s_addr == htonl( INADDR_ANY ) ) { for ( i = 0; i < l; i++ ) { sa6 = lload_listeners[i]->sl_sa.sa_in6_addr; if ( sa6.sin6_family == AF_INET6 && !memcmp( &sa6.sin6_addr, &in6addr_any, sizeof(struct in6_addr) ) ) { break; } } if ( i < l ) { /* We are already listening to in6addr_any */ Debug( LDAP_DEBUG_CONNS, "lload_listener_activate: " "Attempt to listen to 0.0.0.0 failed, " "already listening on ::, assuming IPv4 " "included\n" ); lloadd_close( lload_listeners[l]->sl_sd ); lload_listeners[l]->sl_sd = AC_SOCKET_INVALID; continue; } } } #endif /* LDAP_PF_INET6 */ Debug( LDAP_DEBUG_ANY, "lload_listener_activate: " "listen(%s, 5) failed errno=%d (%s)\n", lload_listeners[l]->sl_url.bv_val, err, sock_errstr( err, ebuf, sizeof(ebuf) ) ); return -1; } lload_listeners[l]->base = listener_base; lload_listeners[l]->listener = listener; evconnlistener_set_error_cb( listener, listener_error_cb ); } rc = ldap_pvt_thread_create( &listener_tid, 0, lload_listener_thread, lload_listeners[l] ); if ( rc != 0 ) { Debug( LDAP_DEBUG_ANY, "lload_listener_activate(%d): " "submit failed (%d)\n", lload_listeners[l]->sl_sd, rc ); } return rc; } static void * lloadd_io_task( void *ptr ) { int rc; int tid = (ldap_pvt_thread_t *)ptr - daemon_tid; struct event_base *base = lload_daemon[tid].base; struct event *event; event = event_new( base, -1, EV_WRITE, daemon_wakeup_cb, ptr ); if ( !event ) { Debug( LDAP_DEBUG_ANY, "lloadd_io_task: " "failed to set up the wakeup event\n" ); return (void *)-1; } event_add( event, NULL ); lload_daemon[tid].wakeup_event = event; /* run */ rc = event_base_dispatch( base ); Debug( LDAP_DEBUG_ANY, "lloadd_io_task: " "Daemon %d, event loop finished: rc=%d\n", tid, rc ); if ( !slapd_gentle_shutdown ) { slapd_abrupt_shutdown = 1; } return NULL; } int lloadd_daemon( struct event_base *daemon_base ) { int i, rc; LloadBackend *b; struct event_base *base; struct event *event; assert( daemon_base != NULL ); #ifndef EVDNS_BASE_INITIALIZE_NAMESERVERS /* libevent 2.0 support */ #define EVDNS_BASE_INITIALIZE_NAMESERVERS 1 #endif /* !EVDNS_BASE_INITIALIZE_NAMESERVERS */ dnsbase = evdns_base_new( daemon_base, EVDNS_BASE_INITIALIZE_NAMESERVERS ); if ( !dnsbase ) { Debug( LDAP_DEBUG_ANY, "lloadd startup: " "failed to set up for async name resolution\n" ); return -1; } if ( lload_daemon_threads > SLAPD_MAX_DAEMON_THREADS ) lload_daemon_threads = SLAPD_MAX_DAEMON_THREADS; daemon_tid = ch_malloc( lload_daemon_threads * sizeof(ldap_pvt_thread_t) ); for ( i = 0; i < lload_daemon_threads; i++ ) { base = event_base_new(); if ( !base ) { Debug( LDAP_DEBUG_ANY, "lloadd startup: " "failed to acquire event base for an I/O thread\n" ); return -1; } lload_daemon[i].base = base; ldap_pvt_thread_mutex_init( &lload_daemon[i].sd_mutex ); /* threads that handle client and upstream sockets */ rc = ldap_pvt_thread_create( &daemon_tid[i], 0, lloadd_io_task, &daemon_tid[i] ); if ( rc != 0 ) { Debug( LDAP_DEBUG_ANY, "lloadd startup: " "listener ldap_pvt_thread_create failed (%d)\n", rc ); return rc; } } if ( (rc = lload_listener_activate()) != 0 ) { return rc; } if ( !LDAP_CIRCLEQ_EMPTY( &backend ) ) { current_backend = LDAP_CIRCLEQ_FIRST( &backend ); LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) { event = evtimer_new( daemon_base, backend_connect, b ); if ( !event ) { Debug( LDAP_DEBUG_ANY, "lloadd: " "failed to allocate retry event\n" ); return -1; } checked_lock( &b->b_mutex ); b->b_retry_event = event; backend_retry( b ); checked_unlock( &b->b_mutex ); } } event = evtimer_new( daemon_base, operations_timeout, NULL ); if ( !event ) { Debug( LDAP_DEBUG_ANY, "lloadd: " "failed to allocate timeout event\n" ); return -1; } lload_timeout_event = event; /* TODO: should we just add it with any timeout and re-add when the timeout * changes? */ if ( lload_timeout_api ) { event_add( event, lload_timeout_api ); } lloadd_inited = 1; rc = event_base_dispatch( daemon_base ); Debug( LDAP_DEBUG_ANY, "lloadd shutdown: " "Main event loop finished: rc=%d\n", rc ); /* shutdown */ event_base_loopexit( listener_base, 0 ); /* wait for the listener threads to complete */ destroy_listeners(); /* Mark upstream connections closing and prevent from opening new ones */ LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) { checked_lock( &b->b_mutex ); b->b_numconns = b->b_numbindconns = 0; backend_reset( b, 1 ); checked_unlock( &b->b_mutex ); } /* Do the same for clients */ clients_destroy( 1 ); for ( i = 0; i < lload_daemon_threads; i++ ) { /* * https://github.com/libevent/libevent/issues/623 * deleting the event doesn't notify the base, just activate it and * let it delete itself */ event_active( lload_daemon[i].wakeup_event, EV_READ, 0 ); } for ( i = 0; i < lload_daemon_threads; i++ ) { ldap_pvt_thread_join( daemon_tid[i], (void *)NULL ); } #ifndef BALANCER_MODULE if ( LogTest( LDAP_DEBUG_ANY ) ) { int t = ldap_pvt_thread_pool_backload( &connection_pool ); Debug( LDAP_DEBUG_ANY, "lloadd shutdown: " "waiting for %d operations/tasks to finish\n", t ); } ldap_pvt_thread_pool_close( &connection_pool, 1 ); #endif lload_backends_destroy(); clients_destroy( 0 ); lload_bindconf_free( &bindconf ); evdns_base_free( dnsbase, 0 ); ch_free( daemon_tid ); daemon_tid = NULL; lloadd_daemon_destroy(); /* If we're a slapd module, let the thread that initiated the shut down * know we've finished */ ldap_pvt_thread_cond_signal( &lload_wait_cond ); return 0; } static void daemon_wakeup_cb( evutil_socket_t sig, short what, void *arg ) { int tid = (ldap_pvt_thread_t *)arg - daemon_tid; Debug( LDAP_DEBUG_TRACE, "daemon_wakeup_cb: " "Daemon thread %d woken up\n", tid ); event_del( lload_daemon[tid].wakeup_event ); } LloadChange lload_change = { .type = LLOAD_CHANGE_UNDEFINED }; #ifdef BALANCER_MODULE int backend_conn_cb( ldap_pvt_thread_start_t *start, void *startarg, void *arg ) { LloadConnection *c = startarg; LloadBackend *b = arg; if ( b == NULL || c->c_private == b ) { CONNECTION_LOCK_DESTROY(c); return 1; } return 0; } int client_tls_cb( ldap_pvt_thread_start_t *start, void *startarg, void *arg ) { LloadConnection *c = startarg; if ( c->c_destroy == client_destroy && c->c_is_tls == LLOAD_TLS_ESTABLISHED ) { CONNECTION_LOCK_DESTROY(c); return 1; } return 0; } void lload_handle_backend_invalidation( LloadChange *change ) { LloadBackend *b = change->target; assert( change->object == LLOAD_BACKEND ); if ( change->type == LLOAD_CHANGE_ADD ) { BackendInfo *mi = backend_info( "monitor" ); if ( mi ) { monitor_extra_t *mbe = mi->bi_extra; if ( mbe->is_configured() ) { lload_monitor_backend_init( mi, b ); } } if ( !current_backend ) { current_backend = b; } checked_lock( &b->b_mutex ); backend_retry( b ); checked_unlock( &b->b_mutex ); return; } else if ( change->type == LLOAD_CHANGE_DEL ) { ldap_pvt_thread_pool_walk( &connection_pool, handle_pdus, backend_conn_cb, b ); ldap_pvt_thread_pool_walk( &connection_pool, upstream_bind, backend_conn_cb, b ); lload_backend_destroy( b ); return; } assert( change->type == LLOAD_CHANGE_MODIFY ); /* * A change that can't be handled gracefully, terminate all connections and * start over. */ if ( change->flags.backend & LLOAD_BACKEND_MOD_OTHER ) { ldap_pvt_thread_pool_walk( &connection_pool, handle_pdus, backend_conn_cb, b ); ldap_pvt_thread_pool_walk( &connection_pool, upstream_bind, backend_conn_cb, b ); checked_lock( &b->b_mutex ); backend_reset( b, 0 ); backend_retry( b ); checked_unlock( &b->b_mutex ); return; } /* * Handle changes to number of connections: * - a change might get the connection limit above the pool size: * - consider closing (in order of priority?): * - connections awaiting connect() completion * - connections currently preparing * - bind connections over limit (which is 0 if 'feature vc' is on * - regular connections over limit * - below pool size * - call backend_retry if there are no opening connections * - one pool size above and one below the configured size * - still close the ones above limit, it should sort itself out * the only issue is if a closing connection isn't guaranteed to do * that at some point */ if ( change->flags.backend & LLOAD_BACKEND_MOD_CONNS ) { int bind_requested = 0, need_close = 0, need_open = 0; LloadConnection *c; bind_requested = #ifdef LDAP_API_FEATURE_VERIFY_CREDENTIALS (lload_features & LLOAD_FEATURE_VC) ? 0 : #endif /* LDAP_API_FEATURE_VERIFY_CREDENTIALS */ b->b_numbindconns; if ( b->b_bindavail > bind_requested ) { need_close += b->b_bindavail - bind_requested; } else if ( b->b_bindavail < bind_requested ) { need_open = 1; } if ( b->b_active > b->b_numconns ) { need_close += b->b_active - b->b_numconns; } else if ( b->b_active < b->b_numconns ) { need_open = 1; } if ( !need_open ) { need_close += b->b_opening; while ( !LDAP_LIST_EMPTY( &b->b_connecting ) ) { LloadPendingConnection *p = LDAP_LIST_FIRST( &b->b_connecting ); LDAP_LIST_REMOVE( p, next ); event_free( p->event ); evutil_closesocket( p->fd ); ch_free( p ); b->b_opening--; need_close--; } } if ( need_close || !need_open ) { /* It might be too late to repurpose a preparing connection, just * close them all */ while ( !LDAP_CIRCLEQ_EMPTY( &b->b_preparing ) ) { c = LDAP_CIRCLEQ_FIRST( &b->b_preparing ); event_del( c->c_read_event ); CONNECTION_LOCK_DESTROY(c); assert( c == NULL ); b->b_opening--; need_close--; } if ( event_pending( b->b_retry_event, EV_TIMEOUT, NULL ) ) { event_del( b->b_retry_event ); b->b_opening--; } assert( b->b_opening == 0 ); } if ( b->b_bindavail > bind_requested ) { int diff = b->b_bindavail - bind_requested; assert( need_close >= diff ); LDAP_CIRCLEQ_FOREACH ( c, &b->b_bindconns, c_next ) { int gentle = 1; lload_connection_close( c, &gentle ); need_close--; diff--; if ( !diff ) { break; } } assert( diff == 0 ); } if ( b->b_active > b->b_numconns ) { int diff = b->b_active - b->b_numconns; assert( need_close >= diff ); LDAP_CIRCLEQ_FOREACH ( c, &b->b_conns, c_next ) { int gentle = 1; lload_connection_close( c, &gentle ); need_close--; diff--; if ( !diff ) { break; } } assert( diff == 0 ); } assert( need_close == 0 ); if ( need_open ) { checked_lock( &b->b_mutex ); backend_retry( b ); checked_unlock( &b->b_mutex ); } } } void lload_handle_global_invalidation( LloadChange *change ) { assert( change->type == LLOAD_CHANGE_MODIFY ); assert( change->object == LLOAD_DAEMON ); if ( change->flags.daemon & LLOAD_DAEMON_MOD_THREADS ) { /* walk the task queue to remove any tasks belonging to us. */ /* TODO: initiate a full module restart, everything will fall into * place at that point */ ldap_pvt_thread_pool_walk( &connection_pool, handle_pdus, backend_conn_cb, NULL ); ldap_pvt_thread_pool_walk( &connection_pool, upstream_bind, backend_conn_cb, NULL ); assert(0); return; } if ( change->flags.daemon & LLOAD_DAEMON_MOD_FEATURES ) { lload_features_t feature_diff = lload_features ^ ( ~(uintptr_t)change->target ); /* Feature change handling: * - VC (TODO): * - on: terminate all bind connections * - off: cancel all bind operations in progress, reopen bind connections * - ProxyAuthz: * - on: nothing needed * - off: clear c_auth/privileged on each client * - read pause (WIP): * - nothing needed? */ assert( change->target ); if ( feature_diff & LLOAD_FEATURE_VC ) { assert(0); feature_diff &= ~LLOAD_FEATURE_VC; } if ( feature_diff & LLOAD_FEATURE_PAUSE ) { feature_diff &= ~LLOAD_FEATURE_PAUSE; } if ( feature_diff & LLOAD_FEATURE_PROXYAUTHZ ) { if ( !(lload_features & LLOAD_FEATURE_PROXYAUTHZ) ) { LloadConnection *c; /* We switched proxyauthz off */ LDAP_CIRCLEQ_FOREACH ( c, &clients, c_next ) { if ( !BER_BVISNULL( &c->c_auth ) ) { ber_memfree( c->c_auth.bv_val ); BER_BVZERO( &c->c_auth ); } if ( c->c_type == LLOAD_C_PRIVILEGED ) { c->c_type = LLOAD_C_OPEN; } } } feature_diff &= ~LLOAD_FEATURE_PROXYAUTHZ; } assert( !feature_diff ); } if ( change->flags.daemon & LLOAD_DAEMON_MOD_TLS ) { /* terminate all clients with TLS set up */ ldap_pvt_thread_pool_walk( &connection_pool, handle_pdus, client_tls_cb, NULL ); if ( !LDAP_CIRCLEQ_EMPTY( &clients ) ) { LloadConnection *c = LDAP_CIRCLEQ_FIRST( &clients ); unsigned long first_connid = c->c_connid; while ( c ) { LloadConnection *next = LDAP_CIRCLEQ_LOOP_NEXT( &clients, c, c_next ); if ( c->c_is_tls ) { CONNECTION_LOCK_DESTROY(c); assert( c == NULL ); } c = next; if ( c->c_connid <= first_connid ) { c = NULL; } } } } if ( change->flags.daemon & LLOAD_DAEMON_MOD_BINDCONF ) { LloadBackend *b; LloadConnection *c; /* * Only timeout changes can be handled gracefully, terminate all * connections and start over. */ ldap_pvt_thread_pool_walk( &connection_pool, handle_pdus, backend_conn_cb, NULL ); ldap_pvt_thread_pool_walk( &connection_pool, upstream_bind, backend_conn_cb, NULL ); LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) { checked_lock( &b->b_mutex ); backend_reset( b, 0 ); backend_retry( b ); checked_unlock( &b->b_mutex ); } /* Reconsider the PRIVILEGED flag on all clients */ LDAP_CIRCLEQ_FOREACH ( c, &clients, c_next ) { int privileged = ber_bvstrcasecmp( &c->c_auth, &lloadd_identity ); /* We have just terminated all pending operations (even pins), there * should be no connections still binding/closing */ assert( c->c_state == LLOAD_C_READY ); c->c_type = privileged ? LLOAD_C_PRIVILEGED : LLOAD_C_OPEN; } } } int lload_handle_invalidation( LloadChange *change ) { if ( (change->type == LLOAD_CHANGE_MODIFY) && change->flags.generic == 0 ) { Debug( LDAP_DEBUG_ANY, "lload_handle_invalidation: " "a modify where apparently nothing changed\n" ); } switch ( change->object ) { case LLOAD_BACKEND: lload_handle_backend_invalidation( change ); break; case LLOAD_DAEMON: lload_handle_global_invalidation( change ); break; default: Debug( LDAP_DEBUG_ANY, "lload_handle_invalidation: " "unrecognised change\n" ); assert(0); } return LDAP_SUCCESS; } static void lload_pause_event_cb( evutil_socket_t s, short what, void *arg ) { /* * We are pausing, signal the pausing thread we've finished and * wait until the thread pool resumes operation. * * Do this in lockstep with the pausing thread. */ checked_lock( &lload_wait_mutex ); ldap_pvt_thread_cond_signal( &lload_wait_cond ); /* Now wait until we unpause, then we can resume operation */ ldap_pvt_thread_cond_wait( &lload_pause_cond, &lload_wait_mutex ); checked_unlock( &lload_wait_mutex ); } /* * Signal the event base to terminate processing as soon as it can and wait for * lload_pause_event_cb to notify us this has happened. */ static int lload_pause_base( struct event_base *base ) { int rc; checked_lock( &lload_wait_mutex ); event_base_once( base, -1, EV_TIMEOUT, lload_pause_event_cb, base, NULL ); rc = ldap_pvt_thread_cond_wait( &lload_wait_cond, &lload_wait_mutex ); checked_unlock( &lload_wait_mutex ); return rc; } void lload_pause_server( void ) { LloadChange ch = { .type = LLOAD_CHANGE_UNDEFINED }; int i; lload_pause_base( listener_base ); lload_pause_base( daemon_base ); for ( i = 0; i < lload_daemon_threads; i++ ) { lload_pause_base( lload_daemon[i].base ); } lload_change = ch; } void lload_unpause_server( void ) { if ( lload_change.type != LLOAD_CHANGE_UNDEFINED ) { lload_handle_invalidation( &lload_change ); } /* * Make sure lloadd is completely ready to unpause by now: * * After the broadcast, we handle I/O and begin filling the thread pool, in * high load conditions, we might hit the pool limits and start processing * operations in the I/O threads (one PDU per socket at a time for fairness * sake) even before a pause has finished from slapd's point of view! * * When (max_pdus_per_cycle == 0) we don't use the pool for these at all and * most lload processing starts immediately making this even more prominent. */ ldap_pvt_thread_cond_broadcast( &lload_pause_cond ); } #endif /* BALANCER_MODULE */ void lload_sig_shutdown( evutil_socket_t sig, short what, void *arg ) { struct event_base *daemon_base = arg; int save_errno = errno; int i; /* * If the NT Service Manager is controlling the server, we don't * want SIGBREAK to kill the server. For some strange reason, * SIGBREAK is generated when a user logs out. */ #if defined(HAVE_NT_SERVICE_MANAGER) && defined(SIGBREAK) if ( is_NT_Service && sig == SIGBREAK ) { /* empty */; } else #endif /* HAVE_NT_SERVICE_MANAGER && SIGBREAK */ #ifdef SIGHUP if ( sig == SIGHUP && global_gentlehup && slapd_gentle_shutdown == 0 ) { slapd_gentle_shutdown = 1; } else #endif /* SIGHUP */ { slapd_shutdown = 1; } for ( i = 0; i < lload_daemon_threads; i++ ) { event_base_loopexit( lload_daemon[i].base, NULL ); } event_base_loopexit( daemon_base, NULL ); errno = save_errno; } struct event_base * lload_get_base( ber_socket_t s ) { int tid = DAEMON_ID(s); return lload_daemon[tid].base; } LloadListener ** lloadd_get_listeners( void ) { /* Could return array with no listeners if !listening, but current * callers mostly look at the URLs. E.g. syncrepl uses this to * identify the server, which means it wants the startup arguments. */ return lload_listeners; } /* Reject all incoming requests */ void lload_suspend_listeners( void ) { int i; for ( i = 0; lload_listeners[i]; i++ ) { lload_listeners[i]->sl_mute = 1; evconnlistener_disable( lload_listeners[i]->listener ); listen( lload_listeners[i]->sl_sd, 0 ); } } /* Resume after a suspend */ void lload_resume_listeners( void ) { int i; for ( i = 0; lload_listeners[i]; i++ ) { lload_listeners[i]->sl_mute = 0; listen( lload_listeners[i]->sl_sd, SLAPD_LISTEN_BACKLOG ); evconnlistener_enable( lload_listeners[i]->listener ); } }