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diff --git a/src/frontend/sock.c b/src/frontend/sock.c
index cac49e1db1648b93cc7cd55d933383dd274103f9..1f3ec5fd74b70ee903a68ce8678bd2fb69c4a87b 100644 (file)
--- a/src/frontend/sock.c
+++ b/src/frontend/sock.c
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
#include "sysdb.h"
-#include "core/error.h"
#include "core/object.h"
#include "frontend/connection-private.h"
#include "frontend/sock.h"
#include "utils/channel.h"
+#include "utils/error.h"
#include "utils/llist.h"
+#include "utils/os.h"
+#include "utils/ssl.h"
#include "utils/strbuf.h"
#include <assert.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
+#include <sys/param.h>
#include <sys/un.h>
+#ifdef HAVE_UCRED_H
+# include <ucred.h>
+#endif
+#ifdef HAVE_SYS_UCRED_H
+# include <sys/ucred.h>
+#endif
+
+#include <pwd.h>
+
+#include <fcntl.h>
+#include <netdb.h>
+#include <libgen.h>
#include <pthread.h>
/*
char *address;
int type;
+ /* optional SSL settings */
+ sdb_ssl_options_t ssl_opts;
+ sdb_ssl_server_t *ssl;
+
+ /* listener configuration */
int sock_fd;
+ int (*setup)(sdb_conn_t *, void *);
} listener_t;
typedef struct {
int type;
const char *prefix;
- int (*opener)(listener_t *);
+ int (*open)(listener_t *);
+ void (*close)(listener_t *);
} fe_listener_impl_t;
struct sdb_fe_socket {
listener_t *listeners;
size_t listeners_num;
+ /* list of open, idle connections; active connections will be passed on to
+ * the connection handler threads which place them back after handling
+ * pending actions; the trigger pipe is used to notify the main thread
+ * after adding a connection (back) to the list */
sdb_llist_t *open_connections;
+ int trigger[2];
+#define TRIGGER_READ 0
+#define TRIGGER_WRITE 1
/* channel used for communication between main
* and connection handler threads */
sdb_channel_t *chan;
};
+/*
+ * SSL helper functions
+ */
+
+static ssize_t
+ssl_read(sdb_conn_t *conn, size_t n)
+{
+ char buf[n];
+ ssize_t ret;
+
+ ret = sdb_ssl_session_read(conn->ssl_session, buf, n);
+ if (ret <= 0)
+ return ret;
+
+ sdb_strbuf_memappend(conn->buf, buf, ret);
+ return ret;
+} /* ssl_read */
+
+static ssize_t
+ssl_write(sdb_conn_t *conn, const void *buf, size_t n)
+{
+ return sdb_ssl_session_write(conn->ssl_session, buf, n);
+} /* ssl_write */
+
/*
* connection management functions
*/
static int
-open_unix_sock(listener_t *listener)
+setup_unixsock(sdb_conn_t *conn, void __attribute__((unused)) *user_data)
+{
+ uid_t uid;
+
+ struct passwd pw_entry;
+ struct passwd *result = NULL;
+ char buf[1024];
+
+#ifdef SO_PEERCRED
+ struct ucred cred;
+ socklen_t len = sizeof(cred);
+
+ if (getsockopt(conn->fd, SOL_SOCKET, SO_PEERCRED, &cred, &len)
+ || (len != sizeof(cred))) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to determine peer for "
+ "connection conn#%i: %s", conn->fd,
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+ uid = cred.uid;
+#else /* SO_PEERCRED */
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to determine peer for "
+ "connection conn#%i: operation not supported", conn->fd);
+ return -1;
+#endif
+
+ memset(&pw_entry, 0, sizeof(pw_entry));
+ if (getpwuid_r(uid, &pw_entry, buf, sizeof(buf), &result) || (! result)
+ || (! (conn->username = strdup(result->pw_name)))) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to determine peer for "
+ "connection conn#%i: %s", conn->fd,
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+ return 0;
+} /* setup_unixsock */
+
+static int
+open_unixsock(listener_t *listener)
{
+ char *addr_copy;
+ char *base_dir;
struct sockaddr_un sa;
int status;
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_UNIX;
- strncpy(sa.sun_path, listener->address + strlen("unix:"),
- sizeof(sa.sun_path));
+ strncpy(sa.sun_path, listener->address, sizeof(sa.sun_path));
+
+ addr_copy = strdup(listener->address);
+ if (! addr_copy) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: strdup failed: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+ base_dir = dirname(addr_copy);
+
+ /* ensure that the directory exists */
+ if (sdb_mkdir_all(base_dir, 0777)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to create directory '%s': %s",
+ base_dir, sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ free(addr_copy);
+ return -1;
+ }
+ free(addr_copy);
+
+ if (unlink(listener->address) && (errno != ENOENT)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_WARNING, "frontend: Failed to remove stale UNIX "
+ "socket %s: %s", listener->address,
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ }
status = bind(listener->sock_fd, (struct sockaddr *)&sa, sizeof(sa));
if (status) {
listener->address, sdb_strerror(errno, buf, sizeof(buf)));
return -1;
}
+
+ listener->setup = setup_unixsock;
+ return 0;
+} /* open_unixsock */
+
+static void
+close_unixsock(listener_t *listener)
+{
+ assert(listener);
+
+ if (! listener->address)
+ return;
+
+ if (listener->sock_fd >= 0)
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+
+ unlink(listener->address);
+} /* close_unixsock */
+
+static int
+finish_tcp(sdb_conn_t *conn)
+{
+ if (! conn->ssl_session)
+ return 0;
+
+ sdb_ssl_session_destroy(conn->ssl_session);
+ conn->ssl_session = NULL;
+ return 0;
+} /* finish_tcp */
+
+static int
+setup_tcp(sdb_conn_t *conn, void *user_data)
+{
+ listener_t *listener = user_data;
+
+ conn->ssl_session = sdb_ssl_server_accept(listener->ssl, conn->fd);
+ if (! conn->ssl_session)
+ return -1;
+
+ conn->username = sdb_ssl_session_peer(conn->ssl_session);
+
+ conn->finish = finish_tcp;
+ conn->read = ssl_read;
+ conn->write = ssl_write;
return 0;
-} /* open_unix_sock */
+} /* setup_tcp */
+
+static int
+open_tcp(listener_t *listener)
+{
+ struct addrinfo *ai, *ai_list = NULL;
+ int status;
+
+ assert(listener);
+
+ listener->ssl = sdb_ssl_server_create(&listener->ssl_opts);
+ if (! listener->ssl)
+ return -1;
+
+ if ((status = sdb_resolve(SDB_NET_TCP, listener->address, &ai_list))) {
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to resolve '%s': %s",
+ listener->address, gai_strerror(status));
+ return -1;
+ }
+
+ for (ai = ai_list; ai != NULL; ai = ai->ai_next) {
+ char errbuf[1024];
+ int reuse = 1;
+
+ listener->sock_fd = socket(ai->ai_family,
+ ai->ai_socktype, ai->ai_protocol);
+ if (listener->sock_fd < 0) {
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to open socket for %s: %s",
+ listener->address,
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ continue;
+ }
+
+ if (setsockopt(listener->sock_fd, SOL_SOCKET, SO_REUSEADDR,
+ &reuse, sizeof(reuse)) < 0) {
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to set socket option: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+ continue;
+ }
+
+ if (bind(listener->sock_fd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ char host[1024], port[32];
+ getnameinfo(ai->ai_addr, ai->ai_addrlen, host, sizeof(host),
+ port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to bind to %s:%s: %s",
+ host, port, sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+ continue;
+ }
+ break;
+ }
+ freeaddrinfo(ai_list);
+
+ if (listener->sock_fd < 0)
+ return -1;
+
+ listener->setup = setup_tcp;
+ return 0;
+} /* open_tcp */
+
+static void
+close_tcp(listener_t *listener)
+{
+ assert(listener);
+
+ sdb_ssl_server_destroy(listener->ssl);
+ listener->ssl = NULL;
+
+ if (listener->sock_fd >= 0)
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+} /* close_tcp */
/*
* private variables
/* the enum has to be sorted the same as the implementations array
* to ensure that the type may be used as index into the array */
enum {
- LISTENER_UNIXSOCK = 0,
+ LISTENER_TCP = 0, /* this is the default */
+ LISTENER_UNIXSOCK,
};
static fe_listener_impl_t listener_impls[] = {
- { LISTENER_UNIXSOCK, "unix", open_unix_sock },
+ { LISTENER_TCP, "tcp", open_tcp, close_tcp },
+ { LISTENER_UNIXSOCK, "unix", open_unixsock, close_unixsock },
};
/*
* private helper functions
*/
+static int
+listener_listen(listener_t *listener)
+{
+ assert(listener);
+
+ /* try to reopen */
+ if (listener->sock_fd < 0)
+ if (listener_impls[listener->type].open(listener))
+ return -1;
+ assert(listener->sock_fd >= 0);
+
+ if (listen(listener->sock_fd, /* backlog = */ 32)) {
+ char buf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to listen on socket %s: %s",
+ listener->address, sdb_strerror(errno, buf, sizeof(buf)));
+ return -1;
+ }
+ sdb_log(SDB_LOG_INFO, "frontend: Listening on %s", listener->address);
+ return 0;
+} /* listener_listen */
+
+static void
+listener_close(listener_t *listener)
+{
+ assert(listener);
+
+ if (listener_impls[listener->type].close)
+ listener_impls[listener->type].close(listener);
+
+ if (listener->sock_fd >= 0)
+ close(listener->sock_fd);
+ listener->sock_fd = -1;
+} /* listener_close */
+
static int
get_type(const char *address)
{
size_t len;
size_t i;
+ if (*address == '/')
+ return LISTENER_UNIXSOCK;
sep = strchr(address, (int)':');
if (! sep)
- return -1;
+ return listener_impls[0].type;
assert(sep > address);
len = (size_t)(sep - address);
return impl->type;
}
}
- return -1;
+ /* don't report an error, this could be an IPv6 address */
+ return listener_impls[0].type;
} /* get_type */
static void
if (! listener)
return;
- if (listener->sock_fd >= 0)
- close(listener->sock_fd);
- listener->sock_fd = -1;
+ listener_close(listener);
+ sdb_ssl_free_options(&listener->ssl_opts);
if (listener->address)
free(listener->address);
+ listener->address = NULL;
} /* listener_destroy */
static listener_t *
listener_create(sdb_fe_socket_t *sock, const char *address)
{
listener_t *listener;
+ size_t len;
int type;
type = get_type(address);
}
listener = realloc(sock->listeners,
- sock->listeners_num * sizeof(*sock->listeners));
+ (sock->listeners_num + 1) * sizeof(*sock->listeners));
if (! listener) {
char buf[1024];
sdb_log(SDB_LOG_ERR, "frontend: Failed to allocate memory: %s",
sock->listeners = listener;
listener = sock->listeners + sock->listeners_num;
+ len = strlen(listener_impls[type].prefix);
+ if ((! strncmp(address, listener_impls[type].prefix, len))
+ && (address[len] == ':'))
+ address += strlen(listener_impls[type].prefix) + 1;
+ memset(listener, 0, sizeof(*listener));
+
listener->sock_fd = -1;
listener->address = strdup(address);
if (! listener->address) {
return NULL;
}
listener->type = type;
-
- if (listener_impls[type].opener(listener)) {
- /* prints error */
- listener_destroy(listener);
- return NULL;
- }
+ listener->setup = NULL;
+ listener->ssl = NULL;
++sock->listeners_num;
return listener;
} /* listener_create */
-static int
-listener_listen(listener_t *listener)
-{
- assert(listener);
-
- /* try to reopen */
- if (listener->sock_fd < 0)
- if (listener_impls[listener->type].opener(listener))
- return -1;
- assert(listener->sock_fd >= 0);
-
- if (listen(listener->sock_fd, /* backlog = */ 32)) {
- char buf[1024];
- sdb_log(SDB_LOG_ERR, "frontend: Failed to listen on socket %s: %s",
- listener->address, sdb_strerror(errno, buf, sizeof(buf)));
- return -1;
- }
- return 0;
-} /* listener_listen */
-
static void
-listener_close(listener_t *listener)
+socket_clear(sdb_fe_socket_t *sock)
{
- assert(listener);
-
- if (listener->sock_fd < 0)
- return;
+ size_t i;
- close(listener->sock_fd);
- listener->sock_fd = -1;
-} /* listener_close */
+ assert(sock);
+ for (i = 0; i < sock->listeners_num; ++i)
+ listener_destroy(sock->listeners + i);
+ if (sock->listeners)
+ free(sock->listeners);
+ sock->listeners = NULL;
+ sock->listeners_num = 0;
+} /* socket_clear */
static void
socket_close(sdb_fe_socket_t *sock)
continue;
}
- status = (int)sdb_connection_read(conn);
+ status = (int)sdb_connection_handle(conn);
if (status <= 0) {
/* error or EOF -> close connection */
sdb_object_deref(SDB_OBJ(conn));
"connection %s to list of open connections",
SDB_OBJ(conn)->name);
}
+ if (write(sock->trigger[TRIGGER_WRITE], "", 1) <= 0) {
+ /* This shouldn't happen and it's not critical; in the worst cases
+ * it slows us down. */
+ sdb_log(SDB_LOG_WARNING, "frontend: Failed to trigger main loop");
+ }
/* pass ownership back to list; or destroy in case of an error */
sdb_object_deref(SDB_OBJ(conn));
sdb_object_t *obj;
int status;
- obj = SDB_OBJ(sdb_connection_accept(listener->sock_fd));
+ obj = SDB_OBJ(sdb_connection_accept(listener->sock_fd,
+ listener->setup, listener));
if (! obj)
return -1;
while (sdb_llist_iter_has_next(iter)) {
sdb_object_t *obj = sdb_llist_iter_get_next(iter);
- if (FD_ISSET(CONN(obj)->fd, exceptions))
+ if (FD_ISSET(CONN(obj)->fd, exceptions)) {
sdb_log(SDB_LOG_INFO, "Exception on fd %d",
CONN(obj)->fd);
+ /* close the connection */
+ sdb_llist_iter_remove_current(iter);
+ sdb_object_deref(obj);
+ continue;
+ }
if (FD_ISSET(CONN(obj)->fd, ready)) {
sdb_llist_iter_remove_current(iter);
sdb_fe_sock_create(void)
{
sdb_fe_socket_t *sock;
+ int flags;
sock = calloc(1, sizeof(*sock));
if (! sock)
return NULL;
+ sock->trigger[TRIGGER_READ] = sock->trigger[TRIGGER_WRITE] = -1;
sock->open_connections = sdb_llist_create();
if (! sock->open_connections) {
sdb_fe_sock_destroy(sock);
return NULL;
}
+
+ if (pipe(sock->trigger)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to create pipe: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ sdb_fe_sock_destroy(sock);
+ return NULL;
+ }
+ /* TODO: Can we do a zero-byte write as well to trigger select()?
+ * Linux does not seem to support the I_SWROPT ioctl on a pipe. */
+ flags = fcntl(sock->trigger[TRIGGER_WRITE], F_GETFL);
+ if (fcntl(sock->trigger[TRIGGER_WRITE], F_SETFL, flags | O_NONBLOCK)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to switch pipe to non-blocking "
+ "mode: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ sdb_fe_sock_destroy(sock);
+ return NULL;
+ }
+ flags = fcntl(sock->trigger[TRIGGER_READ], F_GETFL);
+ if (fcntl(sock->trigger[TRIGGER_READ], F_SETFL, flags | O_NONBLOCK)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to switch pipe to non-blocking "
+ "mode: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ sdb_fe_sock_destroy(sock);
+ return NULL;
+ }
return sock;
} /* sdb_fe_sock_create */
void
sdb_fe_sock_destroy(sdb_fe_socket_t *sock)
{
- size_t i;
-
if (! sock)
return;
- for (i = 0; i < sock->listeners_num; ++i) {
- listener_destroy(sock->listeners + i);
- }
- if (sock->listeners)
- free(sock->listeners);
- sock->listeners = NULL;
+ socket_clear(sock);
+
+ if (sock->trigger[TRIGGER_WRITE] >= 0)
+ close(sock->trigger[TRIGGER_WRITE]);
+ if (sock->trigger[TRIGGER_READ] >= 0)
+ close(sock->trigger[TRIGGER_READ]);
+ sock->trigger[TRIGGER_READ] = sock->trigger[TRIGGER_WRITE] = -1;
sdb_llist_destroy(sock->open_connections);
sock->open_connections = NULL;
} /* sdb_fe_sock_destroy */
int
-sdb_fe_sock_add_listener(sdb_fe_socket_t *sock, const char *address)
+sdb_fe_sock_add_listener(sdb_fe_socket_t *sock, const char *address,
+ const sdb_ssl_options_t *opts)
{
listener_t *listener;
listener = listener_create(sock, address);
if (! listener)
return -1;
+
+ if (opts) {
+ int ret = 0;
+
+ if (opts->ca_file) {
+ listener->ssl_opts.ca_file = strdup(opts->ca_file);
+ if (! listener->ssl_opts.ca_file)
+ ret = -1;
+ }
+ if (opts->key_file) {
+ listener->ssl_opts.key_file = strdup(opts->key_file);
+ if (! listener->ssl_opts.key_file)
+ ret = -1;
+ }
+ if (opts->cert_file) {
+ listener->ssl_opts.cert_file = strdup(opts->cert_file);
+ if (! listener->ssl_opts.cert_file)
+ ret = -1;
+ }
+ if (opts->crl_file) {
+ listener->ssl_opts.crl_file = strdup(opts->crl_file);
+ if (! listener->ssl_opts.crl_file)
+ ret = -1;
+ }
+
+ if (ret) {
+ listener_destroy(listener);
+ --sock->listeners_num;
+ return ret;
+ }
+ }
+
+ if (listener_impls[listener->type].open(listener)) {
+ /* prints error */
+ listener_destroy(listener);
+ --sock->listeners_num;
+ return -1;
+ }
return 0;
} /* sdb_fe_sock_add_listener */
+void
+sdb_fe_sock_clear_listeners(sdb_fe_socket_t *sock)
+{
+ if (! sock)
+ return;
+
+ socket_clear(sock);
+} /* sdb_fe_sock_clear_listeners */
+
int
sdb_fe_sock_listen_and_serve(sdb_fe_socket_t *sock, sdb_fe_loop_t *loop)
{
int max_listen_fd = 0;
size_t i;
- /* XXX: make the number of threads configurable */
- pthread_t handler_threads[5];
+ pthread_t handler_threads[loop->num_threads];
+ size_t num_threads;
- if ((! sock) || (! sock->listeners_num) || (! loop) || sock->chan)
+ if ((! sock) || (! sock->listeners_num) || sock->chan
+ || (! loop) || (loop->num_threads <= 0))
return -1;
+ if (! loop->do_loop)
+ return 0;
+
FD_ZERO(&sockets);
for (i = 0; i < sock->listeners_num; ++i) {
listener_t *listener = sock->listeners + i;
return -1;
}
+ sdb_log(SDB_LOG_INFO, "frontend: Starting %zu connection "
+ "handler thread%s managing %zu listener%s",
+ loop->num_threads, loop->num_threads == 1 ? "" : "s",
+ sock->listeners_num, sock->listeners_num == 1 ? "" : "s");
+
+ num_threads = loop->num_threads;
memset(&handler_threads, 0, sizeof(handler_threads));
- /* XXX: error handling */
- for (i = 0; i < SDB_STATIC_ARRAY_LEN(handler_threads); ++i)
- pthread_create(&handler_threads[i], /* attr = */ NULL,
- connection_handler, /* arg = */ sock);
+ for (i = 0; i < num_threads; ++i) {
+ errno = 0;
+ if (pthread_create(&handler_threads[i], /* attr = */ NULL,
+ connection_handler, /* arg = */ sock)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+ "connection handler thread: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ num_threads = i;
+ break;
+ }
+ }
- while (loop->do_loop) {
+ while (loop->do_loop && num_threads) {
struct timeval timeout = { 1, 0 }; /* one second */
sdb_llist_iter_t *iter;
FD_ZERO(&exceptions);
ready = sockets;
+ FD_SET(sock->trigger[TRIGGER_READ], &ready);
iter = sdb_llist_get_iter(sock->open_connections);
if (! iter) {
while (sdb_llist_iter_has_next(iter)) {
sdb_object_t *obj = sdb_llist_iter_get_next(iter);
+
+ if (CONN(obj)->fd < 0) {
+ sdb_llist_iter_remove_current(iter);
+ sdb_object_deref(obj);
+ continue;
+ }
+
FD_SET(CONN(obj)->fd, &ready);
FD_SET(CONN(obj)->fd, &exceptions);
else if (! n)
continue;
+ if (FD_ISSET(sock->trigger[TRIGGER_READ], &ready)) {
+ char buf[1024];
+ while (read(sock->trigger[TRIGGER_READ], buf, sizeof(buf)) > 0)
+ /* do nothing */;
+ }
+
/* handle new and open connections */
if (socket_handle_incoming(sock, &ready, &exceptions))
break;
sdb_log(SDB_LOG_INFO, "frontend: Waiting for connection handler threads "
"to terminate");
if (! sdb_channel_shutdown(sock->chan))
- for (i = 0; i < SDB_STATIC_ARRAY_LEN(handler_threads); ++i)
+ for (i = 0; i < num_threads; ++i)
pthread_join(handler_threads[i], NULL);
/* else: we tried our best; let the operating system clean up */
sdb_channel_destroy(sock->chan);
sock->chan = NULL;
+
+ if (! num_threads)
+ return -1;
return 0;
} /* sdb_fe_sock_listen_and_server */