diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/listen.c | 374 | ||||
| -rw-r--r-- | src/server_socket.c | 447 | ||||
| -rw-r--r-- | src/server_socket.h | 84 |
3 files changed, 551 insertions, 354 deletions
diff --git a/src/listen.c b/src/listen.c index f6757d4e2..da2e79909 100644 --- a/src/listen.c +++ b/src/listen.c @@ -19,333 +19,44 @@ #include "config.h" #include "listen.h" -#include "socket_util.h" +#include "server_socket.h" #include "client.h" #include "conf.h" -#include "fd_util.h" #include "glib_compat.h" -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> #include <string.h> -#include <errno.h> -#include <unistd.h> -#include <stdlib.h> #include <assert.h> -#ifdef WIN32 -#define WINVER 0x0501 -#include <ws2tcpip.h> -#include <winsock.h> -#else -#include <netinet/in.h> -#include <sys/socket.h> -#include <sys/un.h> -#include <netdb.h> -#endif - #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "listen" #define DEFAULT_PORT 6600 -struct listen_socket { - struct listen_socket *next; - - int fd; - - guint source_id; -}; - -static struct listen_socket *listen_sockets; +static struct server_socket *listen_socket; int listen_port; -static GQuark -listen_quark(void) -{ - return g_quark_from_static_string("listen"); -} - -static gboolean -listen_in_event(GIOChannel *source, GIOCondition condition, gpointer data); - -static bool -listen_add_address(int pf, const struct sockaddr *addrp, socklen_t addrlen, - GError **error) -{ - char *address_string; - int fd; - struct listen_socket *ls; - GIOChannel *channel; - - address_string = sockaddr_to_string(addrp, addrlen, NULL); - if (address_string != NULL) { - g_debug("binding to socket address %s", address_string); - g_free(address_string); - } - - fd = socket_bind_listen(pf, SOCK_STREAM, 0, addrp, addrlen, 5, error); - if (fd < 0) - return false; - - ls = g_new(struct listen_socket, 1); - ls->fd = fd; - - channel = g_io_channel_unix_new(fd); - ls->source_id = g_io_add_watch(channel, G_IO_IN, - listen_in_event, GINT_TO_POINTER(fd)); - g_io_channel_unref(channel); - - ls->next = listen_sockets; - listen_sockets = ls; - - return true; -} - -#ifdef HAVE_TCP - -/** - * Add a listener on a port on all IPv4 interfaces. - * - * @param port the TCP port - * @param error location to store the error occuring, or NULL to ignore errors - * @return true on success - */ -static bool -listen_add_port_ipv4(unsigned int port, GError **error) -{ - struct sockaddr_in sin; - const struct sockaddr *addrp = (const struct sockaddr *)&sin; - socklen_t addrlen = sizeof(sin); - - memset(&sin, 0, sizeof(sin)); - sin.sin_port = htons(port); - sin.sin_family = AF_INET; - sin.sin_addr.s_addr = INADDR_ANY; - - return listen_add_address(PF_INET, addrp, addrlen, error); -} - -#ifdef HAVE_IPV6 -/** - * Add a listener on a port on all IPv6 interfaces. - * - * @param port the TCP port - * @param error location to store the error occuring, or NULL to ignore errors - * @return true on success - */ -static bool -listen_add_port_ipv6(unsigned int port, GError **error) +static void +listen_callback(int fd, const struct sockaddr *address, + size_t address_length, int uid, G_GNUC_UNUSED void *ctx) { - struct sockaddr_in6 sin; - const struct sockaddr *addrp = (const struct sockaddr *)&sin; - socklen_t addrlen = sizeof(sin); - - memset(&sin, 0, sizeof(sin)); - sin.sin6_port = htons(port); - sin.sin6_family = AF_INET6; - - return listen_add_address(PF_INET6, addrp, addrlen, error); + client_new(fd, address, address_length, uid); } -#endif /* HAVE_IPV6 */ - -#endif /* HAVE_TCP */ - -/** - * Add a listener on a port on all interfaces. - * - * @param port the TCP port - * @param error location to store the error occuring, or NULL to ignore errors - * @return true on success - */ -static bool -listen_add_port(unsigned int port, GError **error) -{ -#ifdef HAVE_TCP - bool success; -#ifdef HAVE_IPV6 - bool success6; - GError *error2 = NULL; -#endif - - g_debug("binding to any address"); - -#ifdef HAVE_IPV6 - success6 = listen_add_port_ipv6(port, &error2); - if (!success6) { - if (error2->domain != listen_quark() || - (error2->code != EAFNOSUPPORT && error2->code != EINVAL && - error2->code != EPROTONOSUPPORT)) { - g_propagate_error(error, error2); - return false; - } - - /* although MPD was compiled with IPv6 support, this - host does not have it - ignore this error */ - g_error_free(error2); - } -#endif - - success = listen_add_port_ipv4(port, error); - if (!success) { -#ifdef HAVE_IPV6 - if (success6) - /* non-critical: IPv6 listener is - already set up */ - g_clear_error(error); - else -#endif - return false; - } - - return true; -#else /* HAVE_TCP */ - (void)port; - - g_set_error(error, listen_quark(), 0, - "TCP support is disabled"); - return false; -#endif /* HAVE_TCP */ -} - -/** - * Resolves a host name, and adds listeners on all addresses in the - * result set. - * - * @param hostname the host name to be resolved - * @param port the TCP port - * @param error location to store the error occuring, or NULL to ignore errors - * @return true on success - */ -static bool -listen_add_host(const char *hostname, unsigned port, GError **error_r) -{ -#ifdef HAVE_TCP - struct addrinfo hints, *ai, *i; - char service[20]; - int ret; - bool success; - - g_debug("binding to address for %s", hostname); - - memset(&hints, 0, sizeof(hints)); - hints.ai_flags = AI_PASSIVE; -#ifdef AI_ADDRCONFIG - hints.ai_flags |= AI_ADDRCONFIG; -#endif - hints.ai_family = PF_UNSPEC; - hints.ai_socktype = SOCK_STREAM; - hints.ai_protocol = IPPROTO_TCP; - - g_snprintf(service, sizeof(service), "%u", port); - - ret = getaddrinfo(hostname, service, &hints, &ai); - if (ret != 0) { - g_set_error(error_r, listen_quark(), ret, - "Failed to look up host \"%s\": %s", - hostname, gai_strerror(ret)); - return false; - } - - for (i = ai; i != NULL; i = i->ai_next) { - GError *error = NULL; - - success = listen_add_address(i->ai_family, i->ai_addr, - i->ai_addrlen, &error); - if (!success) { - if (i == ai) { - /* first bind has failed: fatal - error */ - g_propagate_error(error_r, error); - return false; - } else { - char *address_string = - sockaddr_to_string(i->ai_addr, - i->ai_addrlen, - NULL); - if (address_string == NULL) - address_string = g_strdup("[unknown]"); - - g_warning("bind to %s failed: %s " - "(continuing anyway, because at " - "least one address is bound)", - address_string, error->message); - g_free(address_string); - g_error_free(error); - } - } - } - - freeaddrinfo(ai); - - return true; -#else /* HAVE_TCP */ - - (void)hostname; - (void)port; - - g_set_error(error_r, listen_quark(), 0, - "TCP support is disabled"); - return false; -#endif /* HAVE_TCP */ -} - -#ifdef HAVE_UN -/** - * Add a listener on a Unix domain socket. - * - * @param path the absolute socket path - * @param error location to store the error occuring, or NULL to ignore errors - * @return true on success - */ -static bool -listen_add_path(const char *path, GError **error) -{ - size_t path_length; - struct sockaddr_un s_un; - const struct sockaddr *addrp = (const struct sockaddr *)&s_un; - socklen_t addrlen = sizeof(s_un); - bool success; - - path_length = strlen(path); - if (path_length >= sizeof(s_un.sun_path)) { - g_set_error(error, listen_quark(), 0, - "unix socket path is too long"); - return false; - } - - unlink(path); - - s_un.sun_family = AF_UNIX; - memcpy(s_un.sun_path, path, path_length + 1); - - success = listen_add_address(PF_UNIX, addrp, addrlen, error); - if (!success) - return false; - - /* allow everybody to connect */ - chmod(path, 0666); - - return true; -} -#endif /* HAVE_UN */ static bool listen_add_config_param(unsigned int port, const struct config_param *param, - GError **error) + GError **error_r) { assert(param != NULL); if (0 == strcmp(param->value, "any")) { - return listen_add_port(port, error); -#ifdef HAVE_UN + return server_socket_add_port(listen_socket, port, error_r); } else if (param->value[0] == '/') { - return listen_add_path(param->value, error); -#endif /* HAVE_UN */ + return server_socket_add_path(listen_socket, param->value, + error_r); } else { - return listen_add_host(param->value, port, error); + return server_socket_add_host(listen_socket, param->value, + port, error_r); } } @@ -358,6 +69,8 @@ listen_global_init(GError **error_r) bool success; GError *error = NULL; + listen_socket = server_socket_new(listen_callback, NULL); + if (param != NULL) { /* "bind_to_address" is configured, create listeners for all values */ @@ -378,7 +91,7 @@ listen_global_init(GError **error_r) /* no "bind_to_address" configured, bind the configured port on all interfaces */ - success = listen_add_port(port, &error); + success = server_socket_add_port(listen_socket, port, error_r); if (!success) { g_propagate_prefixed_error(error_r, error, "Failed to listen on *:%d: ", @@ -387,6 +100,9 @@ listen_global_init(GError **error_r) } } + if (!server_socket_open(listen_socket, error_r)) + return false; + listen_port = port; return true; } @@ -395,57 +111,7 @@ void listen_global_finish(void) { g_debug("listen_global_finish called"); - while (listen_sockets != NULL) { - struct listen_socket *ls = listen_sockets; - listen_sockets = ls->next; + assert(listen_socket != NULL); - g_source_remove(ls->source_id); - close(ls->fd); - g_free(ls); - } -} - -static int get_remote_uid(int fd) -{ -#ifdef HAVE_STRUCT_UCRED - struct ucred cred; - socklen_t len = sizeof (cred); - - if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0) - return 0; - - return cred.uid; -#else -#ifdef HAVE_GETPEEREID - uid_t euid; - gid_t egid; - - if (getpeereid(fd, &euid, &egid) == 0) - return euid; -#else - (void)fd; -#endif - return -1; -#endif -} - -static gboolean -listen_in_event(G_GNUC_UNUSED GIOChannel *source, - G_GNUC_UNUSED GIOCondition condition, - gpointer data) -{ - int listen_fd = GPOINTER_TO_INT(data), fd; - struct sockaddr_storage sa; - size_t sa_length = sizeof(sa); - - fd = accept_cloexec_nonblock(listen_fd, (struct sockaddr*)&sa, - &sa_length); - if (fd >= 0) { - client_new(fd, (struct sockaddr*)&sa, sa_length, - get_remote_uid(fd)); - } else if (fd < 0 && errno != EINTR) { - g_warning("Problems accept()'ing"); - } - - return true; + server_socket_free(listen_socket); } diff --git a/src/server_socket.c b/src/server_socket.c new file mode 100644 index 000000000..b0eb179a6 --- /dev/null +++ b/src/server_socket.c @@ -0,0 +1,447 @@ +/* + * Copyright (C) 2003-2010 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "server_socket.h" +#include "socket_util.h" +#include "fd_util.h" +#include "glib_compat.h" + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <stdlib.h> +#include <assert.h> + +#ifdef WIN32 +#define WINVER 0x0501 +#include <ws2tcpip.h> +#include <winsock.h> +#else +#include <netinet/in.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <netdb.h> +#endif + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "listen" + +#define DEFAULT_PORT 6600 + +struct one_socket { + struct one_socket *next; + struct server_socket *parent; + + unsigned serial; + + int fd; + guint source_id; + + char *path; + + size_t address_length; + struct sockaddr address; +}; + +struct server_socket { + server_socket_callback_t callback; + void *callback_ctx; + + struct one_socket *sockets, **sockets_tail_r; + unsigned next_serial; +}; + +static GQuark +server_socket_quark(void) +{ + return g_quark_from_static_string("server_socket"); +} + +struct server_socket * +server_socket_new(server_socket_callback_t callback, void *callback_ctx) +{ + struct server_socket *ss = g_new(struct server_socket, 1); + ss->callback = callback; + ss->callback_ctx = callback_ctx; + ss->sockets = NULL; + ss->sockets_tail_r = &ss->sockets; + ss->next_serial = 1; + return ss; +} + +void +server_socket_free(struct server_socket *ss) +{ + server_socket_close(ss); + + while (ss->sockets != NULL) { + struct one_socket *s = ss->sockets; + ss->sockets = s->next; + + assert(s->fd < 0); + + g_free(s->path); + g_free(s); + } + + g_free(ss); +} + +/** + * Wraper for sockaddr_to_string() which never fails. + */ +static char * +one_socket_to_string(const struct one_socket *s) +{ + char *p = sockaddr_to_string(&s->address, s->address_length, NULL); + if (p == NULL) + p = g_strdup("[unknown]"); + return p; +} + +static int +get_remote_uid(int fd) +{ +#ifdef HAVE_STRUCT_UCRED + struct ucred cred; + socklen_t len = sizeof (cred); + + if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0) + return 0; + + return cred.uid; +#else +#ifdef HAVE_GETPEEREID + uid_t euid; + gid_t egid; + + if (getpeereid(fd, &euid, &egid) == 0) + return euid; +#else + (void)fd; +#endif + return -1; +#endif +} + +static gboolean +server_socket_in_event(G_GNUC_UNUSED GIOChannel *source, + G_GNUC_UNUSED GIOCondition condition, + gpointer data) +{ + struct one_socket *s = data; + + struct sockaddr_storage address; + size_t address_length = sizeof(address); + int fd = accept_cloexec_nonblock(s->fd, (struct sockaddr*)&address, + &address_length); + if (fd >= 0) + s->parent->callback(fd, (const struct sockaddr*)&address, + address_length, get_remote_uid(fd), + s->parent->callback_ctx); + else + g_warning("accept() failed: %s", g_strerror(errno)); + + return true; +} + +bool +server_socket_open(struct server_socket *ss, GError **error_r) +{ + struct one_socket *good = NULL, *bad = NULL; + GError *last_error = NULL; + + for (struct one_socket *s = ss->sockets; s != NULL; s = s->next) { + assert(s->serial > 0); + assert(good == NULL || s->serial >= good->serial); + assert(s->fd < 0); + + if (bad != NULL && s->serial != bad->serial) { + server_socket_close(ss); + g_propagate_error(error_r, last_error); + return false; + } + + GError *error = NULL; + s->fd = socket_bind_listen(s->address.sa_family, SOCK_STREAM, 0, + &s->address, s->address_length, 5, + &error); + if (s->fd < 0) { + if (good != NULL && good->serial == s->serial) { + char *address_string = one_socket_to_string(s); + char *good_string = one_socket_to_string(good); + g_warning("bind to '%s' failed: %s " + "(continuing anyway, because " + "binding to '%s' succeeded)", + address_string, error->message, + good_string); + g_free(address_string); + g_free(good_string); + g_error_free(error); + } else if (bad == NULL) { + bad = s; + + char *address_string = one_socket_to_string(s); + g_propagate_prefixed_error(&last_error, error, + "Failed to bind to '%s': ", + address_string); + g_free(address_string); + } else + g_error_free(error); + continue; + } + + /* allow everybody to connect */ + + if (s->path != NULL) + chmod(s->path, 0666); + + /* register in the GLib main loop */ + + GIOChannel *channel = g_io_channel_unix_new(s->fd); + s->source_id = g_io_add_watch(channel, G_IO_IN, + server_socket_in_event, s); + g_io_channel_unref(channel); + + /* mark this socket as "good", and clear previous + errors */ + + good = s; + + if (bad != NULL) { + bad = NULL; + g_error_free(last_error); + last_error = NULL; + } + } + + if (bad != NULL) { + server_socket_close(ss); + g_propagate_error(error_r, last_error); + return false; + } + + return true; +} + +void +server_socket_close(struct server_socket *ss) +{ + for (struct one_socket *s = ss->sockets; s != NULL; s = s->next) { + if (s->fd < 0) + continue; + + g_source_remove(s->source_id); + close(s->fd); + s->fd = -1; + } +} + +static struct one_socket * +one_socket_new(unsigned serial, const struct sockaddr *address, + size_t address_length) +{ + assert(address != NULL); + assert(address_length > 0); + + struct one_socket *s = g_malloc(sizeof(*s) - sizeof(s->address) + + address_length); + s->next = NULL; + s->serial = serial; + s->fd = -1; + s->path = NULL; + s->address_length = address_length; + memcpy(&s->address, address, address_length); + + return s; +} + +static struct one_socket * +server_socket_add_address(struct server_socket *ss, + const struct sockaddr *address, + size_t address_length) +{ + assert(ss != NULL); + assert(ss->sockets_tail_r != NULL); + assert(*ss->sockets_tail_r == NULL); + + struct one_socket *s = one_socket_new(ss->next_serial, + address, address_length); + s->parent = ss; + *ss->sockets_tail_r = s; + ss->sockets_tail_r = &s->next; + + return s; +} + +#ifdef HAVE_TCP + +/** + * Add a listener on a port on all IPv4 interfaces. + * + * @param port the TCP port + */ +static void +server_socket_add_port_ipv4(struct server_socket *ss, unsigned port) +{ + struct sockaddr_in sin; + memset(&sin, 0, sizeof(sin)); + sin.sin_port = htons(port); + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = INADDR_ANY; + + server_socket_add_address(ss, (const struct sockaddr *)&sin, + sizeof(sin)); +} + +#ifdef HAVE_IPV6 +/** + * Add a listener on a port on all IPv6 interfaces. + * + * @param port the TCP port + */ +static void +server_socket_add_port_ipv6(struct server_socket *ss, unsigned port) +{ + struct sockaddr_in6 sin; + memset(&sin, 0, sizeof(sin)); + sin.sin6_port = htons(port); + sin.sin6_family = AF_INET6; + + server_socket_add_address(ss, (const struct sockaddr *)&sin, + sizeof(sin)); +} +#endif /* HAVE_IPV6 */ + +#endif /* HAVE_TCP */ + +bool +server_socket_add_port(struct server_socket *ss, unsigned port, + GError **error_r) +{ +#ifdef HAVE_TCP + if (port == 0 || port > 0xffff) { + g_set_error(error_r, server_socket_quark(), 0, + "Invalid TCP port"); + return false; + } + +#ifdef HAVE_IPV6 + server_socket_add_port_ipv6(ss, port); +#endif + server_socket_add_port_ipv4(ss, port); + + ++ss->next_serial; + + return true; +#else /* HAVE_TCP */ + (void)ss; + (void)port; + + g_set_error(error_r, server_socket_quark(), 0, + "TCP support is disabled"); + return false; +#endif /* HAVE_TCP */ +} + +bool +server_socket_add_host(struct server_socket *ss, const char *hostname, + unsigned port, GError **error_r) +{ +#ifdef HAVE_TCP + struct addrinfo hints; + memset(&hints, 0, sizeof(hints)); + hints.ai_flags = AI_PASSIVE; +#ifdef AI_ADDRCONFIG + hints.ai_flags |= AI_ADDRCONFIG; +#endif + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = IPPROTO_TCP; + + char service[20]; + g_snprintf(service, sizeof(service), "%u", port); + + struct addrinfo *ai; + int ret = getaddrinfo(hostname, service, &hints, &ai); + if (ret != 0) { + g_set_error(error_r, server_socket_quark(), ret, + "Failed to look up host \"%s\": %s", + hostname, gai_strerror(ret)); + return false; + } + + for (const struct addrinfo *i = ai; i != NULL; i = i->ai_next) + server_socket_add_address(ss, i->ai_addr, i->ai_addrlen); + + freeaddrinfo(ai); + + ++ss->next_serial; + + return true; +#else /* HAVE_TCP */ + (void)ss; + (void)hostname; + (void)port; + + g_set_error(error_r, server_socket_quark(), 0, + "TCP support is disabled"); + return false; +#endif /* HAVE_TCP */ +} + +bool +server_socket_add_path(struct server_socket *ss, const char *path, + GError **error_r) +{ +#ifdef HAVE_UN + struct sockaddr_un s_un; + + size_t path_length = strlen(path); + if (path_length >= sizeof(s_un.sun_path)) { + g_set_error(error_r, server_socket_quark(), 0, + "UNIX socket path is too long"); + return false; + } + + unlink(path); + + s_un.sun_family = AF_UNIX; + memcpy(s_un.sun_path, path, path_length + 1); + + struct one_socket *s = + server_socket_add_address(ss, (const struct sockaddr *)&s_un, + sizeof(s_un)); + s->path = g_strdup(path); + + return true; +#else /* !HAVE_UN */ + (void)ss; + (void)path; + + g_set_error(error_r, server_socket_quark(), 0, + "UNIX domain socket support is disabled"); + return false; +#endif /* !HAVE_UN */ +} + diff --git a/src/server_socket.h b/src/server_socket.h new file mode 100644 index 000000000..ae0ce0c8d --- /dev/null +++ b/src/server_socket.h @@ -0,0 +1,84 @@ +/* + * Copyright (C) 2003-2010 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_SERVER_SOCKET_H +#define MPD_SERVER_SOCKET_H + +#include <stdbool.h> + +#include <glib.h> + +struct sockaddr; + +typedef void (*server_socket_callback_t)(int fd, + const struct sockaddr *address, + size_t address_length, int uid, + void *ctx); + +struct server_socket * +server_socket_new(server_socket_callback_t callback, void *callback_ctx); + +void +server_socket_free(struct server_socket *ss); + +bool +server_socket_open(struct server_socket *ss, GError **error_r); + +void +server_socket_close(struct server_socket *ss); + +/** + * Add a listener on a port on all interfaces. + * + * @param port the TCP port + * @param error_r location to store the error occuring, or NULL to + * ignore errors + * @return true on success + */ +bool +server_socket_add_port(struct server_socket *ss, unsigned port, + GError **error_r); + +/** + * Resolves a host name, and adds listeners on all addresses in the + * result set. + * + * @param hostname the host name to be resolved + * @param port the TCP port + * @param error_r location to store the error occuring, or NULL to + * ignore errors + * @return true on success + */ +bool +server_socket_add_host(struct server_socket *ss, const char *hostname, + unsigned port, GError **error_r); + +/** + * Add a listener on a Unix domain socket. + * + * @param path the absolute socket path + * @param error_r location to store the error occuring, or NULL to + * ignore errors + * @return true on success + */ +bool +server_socket_add_path(struct server_socket *ss, const char *path, + GError **error_r); + +#endif |