really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 569 insertions, 0 deletions

diff --git a/src/pulsecore/socket-client.c b/src/pulsecore/socket-client.c
new file mode 100644
index 00000000..5b5bc5ca
--- /dev/null
+++ b/src/pulsecore/socket-client.c
@@ -0,0 +1,569 @@
+/* $Id$ */
+
+/***
+    This file is part of PulseAudio.
+
+    Copyright 2004-2006 Lennart Poettering
+    Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+    PulseAudio is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation; either version 2.1 of the
+    License, or (at your option) any later version.
+
+    PulseAudio 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with PulseAudio; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+    USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+/* #undef HAVE_LIBASYNCNS */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#ifdef HAVE_LIBASYNCNS
+#include <asyncns.h>
+#endif
+
+#include <pulse/timeval.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/winsock.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/socket-util.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/parseaddr.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/refcnt.h>
+
+#include "socket-client.h"
+
+#define CONNECT_TIMEOUT 5
+
+struct pa_socket_client {
+    PA_REFCNT_DECLARE;
+    pa_mainloop_api *mainloop;
+    int fd;
+    pa_io_event *io_event;
+    pa_time_event *timeout_event;
+    pa_defer_event *defer_event;
+    void (*callback)(pa_socket_client*c, pa_iochannel *io, void *userdata);
+    void *userdata;
+    int local;
+#ifdef HAVE_LIBASYNCNS
+    asyncns_t *asyncns;
+    asyncns_query_t * asyncns_query;
+    pa_io_event *asyncns_io_event;
+#endif
+};
+
+static pa_socket_client*pa_socket_client_new(pa_mainloop_api *m) {
+    pa_socket_client *c;
+    pa_assert(m);
+
+    c = pa_xnew(pa_socket_client, 1);
+    PA_REFCNT_INIT(c);
+    c->mainloop = m;
+    c->fd = -1;
+    c->io_event = NULL;
+    c->defer_event = NULL;
+    c->timeout_event = NULL;
+    c->callback = NULL;
+    c->userdata = NULL;
+    c->local = 0;
+
+#ifdef HAVE_LIBASYNCNS
+    c->asyncns = NULL;
+    c->asyncns_io_event = NULL;
+    c->asyncns_query = NULL;
+#endif
+
+    return c;
+}
+
+static void free_events(pa_socket_client *c) {
+    pa_assert(c);
+
+    if (c->io_event) {
+        c->mainloop->io_free(c->io_event);
+        c->io_event = NULL;
+    }
+
+    if (c->defer_event) {
+        c->mainloop->defer_free(c->defer_event);
+        c->defer_event = NULL;
+    }
+
+    if (c->timeout_event) {
+        c->mainloop->time_free(c->timeout_event);
+        c->timeout_event = NULL;
+    }
+}
+
+static void do_call(pa_socket_client *c) {
+    pa_iochannel *io = NULL;
+    int error;
+    socklen_t lerror;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(c->callback);
+
+    pa_socket_client_ref(c);
+
+    if (c->fd < 0)
+        goto finish;
+
+    lerror = sizeof(error);
+    if (getsockopt(c->fd, SOL_SOCKET, SO_ERROR, (void*)&error, &lerror) < 0) {
+        pa_log("getsockopt(): %s", pa_cstrerror(errno));
+        goto finish;
+    }
+
+    if (lerror != sizeof(error)) {
+        pa_log("getsockopt() returned invalid size.");
+        goto finish;
+    }
+
+    if (error != 0) {
+        pa_log_debug("connect(): %s", pa_cstrerror(error));
+        errno = error;
+        goto finish;
+    }
+
+    io = pa_iochannel_new(c->mainloop, c->fd, c->fd);
+    pa_assert(io);
+
+finish:
+    if (!io && c->fd >= 0)
+        pa_close(c->fd);
+    c->fd = -1;
+
+    free_events(c);
+
+    pa_assert(c->callback);
+    c->callback(c, io, c->userdata);
+
+    pa_socket_client_unref(c);
+}
+
+static void connect_fixed_cb(pa_mainloop_api *m, pa_defer_event *e, void *userdata) {
+    pa_socket_client *c = userdata;
+
+    pa_assert(m);
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(c->defer_event == e);
+
+    do_call(c);
+}
+
+static void connect_io_cb(pa_mainloop_api*m, pa_io_event *e, int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
+    pa_socket_client *c = userdata;
+
+    pa_assert(m);
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(c->io_event == e);
+    pa_assert(fd >= 0);
+
+    do_call(c);
+}
+
+static int do_connect(pa_socket_client *c, const struct sockaddr *sa, socklen_t len) {
+    int r;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(sa);
+    pa_assert(len > 0);
+
+    pa_make_fd_nonblock(c->fd);
+
+    if ((r = connect(c->fd, sa, len)) < 0) {
+#ifdef OS_IS_WIN32
+        if (WSAGetLastError() != EWOULDBLOCK) {
+            pa_log_debug("connect(): %d", WSAGetLastError());
+#else
+        if (errno != EINPROGRESS) {
+            pa_log_debug("connect(): %s (%d)", pa_cstrerror(errno), errno);
+#endif
+            return -1;
+        }
+
+        pa_assert_se(c->io_event = c->mainloop->io_new(c->mainloop, c->fd, PA_IO_EVENT_OUTPUT, connect_io_cb, c));
+    } else
+        pa_assert_se(c->defer_event = c->mainloop->defer_new(c->mainloop, connect_fixed_cb, c));
+
+    return 0;
+}
+
+pa_socket_client* pa_socket_client_new_ipv4(pa_mainloop_api *m, uint32_t address, uint16_t port) {
+    struct sockaddr_in sa;
+
+    pa_assert(m);
+    pa_assert(port > 0);
+
+    memset(&sa, 0, sizeof(sa));
+    sa.sin_family = AF_INET;
+    sa.sin_port = htons(port);
+    sa.sin_addr.s_addr = htonl(address);
+
+    return pa_socket_client_new_sockaddr(m, (struct sockaddr*) &sa, sizeof(sa));
+}
+
+#ifdef HAVE_SYS_UN_H
+
+pa_socket_client* pa_socket_client_new_unix(pa_mainloop_api *m, const char *filename) {
+    struct sockaddr_un sa;
+
+    pa_assert(m);
+    pa_assert(filename);
+
+    memset(&sa, 0, sizeof(sa));
+    sa.sun_family = AF_UNIX;
+    strncpy(sa.sun_path, filename, sizeof(sa.sun_path)-1);
+    sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
+
+    return pa_socket_client_new_sockaddr(m, (struct sockaddr*) &sa, sizeof(sa));
+}
+
+#else /* HAVE_SYS_UN_H */
+
+pa_socket_client* pa_socket_client_new_unix(pa_mainloop_api *m, const char *filename) {
+    return NULL;
+}
+
+#endif /* HAVE_SYS_UN_H */
+
+static int sockaddr_prepare(pa_socket_client *c, const struct sockaddr *sa, size_t salen) {
+    pa_assert(c);
+    pa_assert(sa);
+    pa_assert(salen);
+
+    switch (sa->sa_family) {
+        case AF_UNIX:
+            c->local = 1;
+            break;
+
+        case AF_INET:
+            c->local = ((const struct sockaddr_in*) sa)->sin_addr.s_addr == INADDR_LOOPBACK;
+            break;
+
+        case AF_INET6:
+            c->local = memcmp(&((const struct sockaddr_in6*) sa)->sin6_addr, &in6addr_loopback, sizeof(struct in6_addr)) == 0;
+            break;
+
+        default:
+            c->local = 0;
+    }
+
+    if ((c->fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) {
+        pa_log("socket(): %s", pa_cstrerror(errno));
+        return -1;
+    }
+
+    pa_make_fd_cloexec(c->fd);
+    if (sa->sa_family == AF_INET || sa->sa_family == AF_INET6)
+        pa_make_tcp_socket_low_delay(c->fd);
+    else
+        pa_make_socket_low_delay(c->fd);
+
+    if (do_connect(c, sa, salen) < 0)
+        return -1;
+
+    return 0;
+}
+
+pa_socket_client* pa_socket_client_new_sockaddr(pa_mainloop_api *m, const struct sockaddr *sa, size_t salen) {
+    pa_socket_client *c;
+
+    pa_assert(m);
+    pa_assert(sa);
+    pa_assert(salen > 0);
+
+    pa_assert_se(c = pa_socket_client_new(m));
+
+    if (sockaddr_prepare(c, sa, salen) < 0)
+        goto fail;
+
+    return c;
+
+fail:
+    pa_socket_client_unref(c);
+    return NULL;
+}
+
+static void socket_client_free(pa_socket_client *c) {
+    pa_assert(c);
+    pa_assert(c->mainloop);
+
+    free_events(c);
+
+    if (c->fd >= 0)
+        pa_close(c->fd);
+
+#ifdef HAVE_LIBASYNCNS
+    if (c->asyncns_query)
+        asyncns_cancel(c->asyncns, c->asyncns_query);
+    if (c->asyncns)
+        asyncns_free(c->asyncns);
+    if (c->asyncns_io_event)
+        c->mainloop->io_free(c->asyncns_io_event);
+#endif
+
+    pa_xfree(c);
+}
+
+void pa_socket_client_unref(pa_socket_client *c) {
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    if (PA_REFCNT_DEC(c) <= 0)
+        socket_client_free(c);
+}
+
+pa_socket_client* pa_socket_client_ref(pa_socket_client *c) {
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_REFCNT_INC(c);
+    return c;
+}
+
+void pa_socket_client_set_callback(pa_socket_client *c, void (*on_connection)(pa_socket_client *c, pa_iochannel*io, void *userdata), void *userdata) {
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    c->callback = on_connection;
+    c->userdata = userdata;
+}
+
+pa_socket_client* pa_socket_client_new_ipv6(pa_mainloop_api *m, uint8_t address[16], uint16_t port) {
+    struct sockaddr_in6 sa;
+
+    pa_assert(m);
+    pa_assert(address);
+    pa_assert(port > 0);
+
+    memset(&sa, 0, sizeof(sa));
+    sa.sin6_family = AF_INET6;
+    sa.sin6_port = htons(port);
+    memcpy(&sa.sin6_addr, address, sizeof(sa.sin6_addr));
+
+    return pa_socket_client_new_sockaddr(m, (struct sockaddr*) &sa, sizeof(sa));
+}
+
+#ifdef HAVE_LIBASYNCNS
+
+static void asyncns_cb(pa_mainloop_api*m, pa_io_event *e, int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
+    pa_socket_client *c = userdata;
+    struct addrinfo *res = NULL;
+    int ret;
+
+    pa_assert(m);
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(c->asyncns_io_event == e);
+    pa_assert(fd >= 0);
+
+    if (asyncns_wait(c->asyncns, 0) < 0)
+        goto fail;
+
+    if (!asyncns_isdone(c->asyncns, c->asyncns_query))
+        return;
+
+    ret = asyncns_getaddrinfo_done(c->asyncns, c->asyncns_query, &res);
+    c->asyncns_query = NULL;
+
+    if (ret != 0 || !res)
+        goto fail;
+
+    if (res->ai_addr)
+        sockaddr_prepare(c, res->ai_addr, res->ai_addrlen);
+
+    asyncns_freeaddrinfo(res);
+
+    m->io_free(c->asyncns_io_event);
+    c->asyncns_io_event = NULL;
+    return;
+
+fail:
+    m->io_free(c->asyncns_io_event);
+    c->asyncns_io_event = NULL;
+
+    errno = EHOSTUNREACH;
+    do_call(c);
+    return;
+
+}
+
+#endif
+
+static void timeout_cb(pa_mainloop_api *m, pa_time_event *e, const struct timeval *tv, void *userdata) {
+    pa_socket_client *c = userdata;
+
+    pa_assert(m);
+    pa_assert(e);
+    pa_assert(tv);
+    pa_assert(c);
+
+    if (c->fd >= 0) {
+        pa_close(c->fd);
+        c->fd = -1;
+    }
+
+    errno = ETIMEDOUT;
+    do_call(c);
+}
+
+static void start_timeout(pa_socket_client *c) {
+    struct timeval tv;
+    pa_assert(c);
+    pa_assert(!c->timeout_event);
+
+    pa_gettimeofday(&tv);
+    pa_timeval_add(&tv, CONNECT_TIMEOUT * 1000000);
+    c->timeout_event = c->mainloop->time_new(c->mainloop, &tv, timeout_cb, c);
+}
+
+pa_socket_client* pa_socket_client_new_string(pa_mainloop_api *m, const char*name, uint16_t default_port) {
+    pa_socket_client *c = NULL;
+    pa_parsed_address a;
+
+    pa_assert(m);
+    pa_assert(name);
+
+    if (pa_parse_address(name, &a) < 0)
+        return NULL;
+
+    if (!a.port)
+        a.port = default_port;
+
+    switch (a.type) {
+        case PA_PARSED_ADDRESS_UNIX:
+            if ((c = pa_socket_client_new_unix(m, a.path_or_host)))
+                start_timeout(c);
+            break;
+
+        case PA_PARSED_ADDRESS_TCP4:  /* Fallthrough */
+        case PA_PARSED_ADDRESS_TCP6:  /* Fallthrough */
+        case PA_PARSED_ADDRESS_TCP_AUTO:{
+
+            struct addrinfo hints;
+            char port[12];
+
+            pa_snprintf(port, sizeof(port), "%u", (unsigned) a.port);
+
+            memset(&hints, 0, sizeof(hints));
+            hints.ai_family = a.type == PA_PARSED_ADDRESS_TCP4 ? PF_INET : (a.type == PA_PARSED_ADDRESS_TCP6 ? PF_INET6 : PF_UNSPEC);
+            hints.ai_socktype = SOCK_STREAM;
+
+#ifdef HAVE_LIBASYNCNS
+            {
+                asyncns_t *asyncns;
+
+                if (!(asyncns = asyncns_new(1)))
+                    goto finish;
+
+                c = pa_socket_client_new(m);
+                c->asyncns = asyncns;
+                c->asyncns_io_event = m->io_new(m, asyncns_fd(c->asyncns), PA_IO_EVENT_INPUT, asyncns_cb, c);
+                c->asyncns_query = asyncns_getaddrinfo(c->asyncns, a.path_or_host, port, &hints);
+                pa_assert(c->asyncns_query);
+                start_timeout(c);
+            }
+#else /* HAVE_LIBASYNCNS */
+            {
+#ifdef HAVE_GETADDRINFO
+                int ret;
+                struct addrinfo *res = NULL;
+
+                ret = getaddrinfo(a.path_or_host, port, &hints, &res);
+
+                if (ret < 0 || !res)
+                    goto finish;
+
+                if (res->ai_addr) {
+                    if ((c = pa_socket_client_new_sockaddr(m, res->ai_addr, res->ai_addrlen)))
+                        start_timeout(c);
+                }
+
+                freeaddrinfo(res);
+#else /* HAVE_GETADDRINFO */
+                struct hostent *host = NULL;
+                struct sockaddr_in s;
+
+                /* FIXME: PF_INET6 support */
+                if (hints.ai_family == PF_INET6) {
+                    pa_log_error("IPv6 is not supported on Windows");
+                    goto finish;
+                }
+
+                host = gethostbyname(a.path_or_host);
+                if (!host) {
+                    unsigned int addr = inet_addr(a.path_or_host);
+                    if (addr != INADDR_NONE)
+                        host = gethostbyaddr((char*)&addr, 4, AF_INET);
+                }
+
+                if (!host)
+                    goto finish;
+
+                s.sin_family = AF_INET;
+                memcpy(&s.sin_addr, host->h_addr, sizeof(struct in_addr));
+                s.sin_port = htons(a.port);
+
+                if ((c = pa_socket_client_new_sockaddr(m, (struct sockaddr*)&s, sizeof(s))))
+                    start_timeout(c);
+#endif /* HAVE_GETADDRINFO */
+            }
+#endif /* HAVE_LIBASYNCNS */
+        }
+    }
+
+finish:
+    pa_xfree(a.path_or_host);
+    return c;
+
+}
+
+/* Return non-zero when the target sockaddr is considered
+   local. "local" means UNIX socket or TCP socket on localhost. Other
+   local IP addresses are not considered local. */
+int pa_socket_client_is_local(pa_socket_client *c) {
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    return c->local;
+}