void pa_context_fail(pa_context *c, int error) { pa_assert(c); pa_assert(PA_REFCNT_VALUE(c) >= 1); pa_context_set_error(c, error); pa_context_set_state(c, PA_CONTEXT_FAILED); }
static void setup_context(pa_context *c, pa_iochannel *io) { uint8_t cookie[PA_NATIVE_COOKIE_LENGTH]; pa_tagstruct *t; uint32_t tag; pa_assert(c); pa_assert(io); pa_context_ref(c); pa_assert(!c->pstream); c->pstream = pa_pstream_new(c->mainloop, io, c->mempool); pa_pstream_set_die_callback(c->pstream, pstream_die_callback, c); pa_pstream_set_receive_packet_callback(c->pstream, pstream_packet_callback, c); pa_pstream_set_receive_memblock_callback(c->pstream, pstream_memblock_callback, c); pa_assert(!c->pdispatch); c->pdispatch = pa_pdispatch_new(c->mainloop, c->use_rtclock, command_table, PA_COMMAND_MAX); if (pa_client_conf_load_cookie(c->conf, cookie, sizeof(cookie)) < 0) pa_log_info("No cookie loaded. Attempting to connect without."); t = pa_tagstruct_command(c, PA_COMMAND_AUTH, &tag); c->do_shm = pa_mempool_is_shared(c->mempool) && c->is_local; pa_log_debug("SHM possible: %s", pa_yes_no(c->do_shm)); /* Starting with protocol version 13 we use the MSB of the version * tag for informing the other side if we could do SHM or not. * Starting from version 31, second MSB is used to flag memfd support. */ pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION | (c->do_shm ? 0x80000000U : 0) | (c->memfd_on_local ? 0x40000000 : 0)); pa_tagstruct_put_arbitrary(t, cookie, sizeof(cookie)); #ifdef HAVE_CREDS { pa_creds ucred; if (pa_iochannel_creds_supported(io)) pa_iochannel_creds_enable(io); ucred.uid = getuid(); ucred.gid = getgid(); pa_pstream_send_tagstruct_with_creds(c->pstream, t, &ucred); } #else pa_pstream_send_tagstruct(c->pstream, t); #endif pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c, NULL); pa_context_set_state(c, PA_CONTEXT_AUTHORIZING); pa_context_unref(c); }
void pa_context_disconnect(pa_context *c) { pa_assert(c); pa_assert(PA_REFCNT_VALUE(c) >= 1); if (pa_detect_fork()) return; if (PA_CONTEXT_IS_GOOD(c->state)) pa_context_set_state(c, PA_CONTEXT_TERMINATED); }
int pa_context_connect( pa_context *c, const char *server, pa_context_flags_t flags, const pa_spawn_api *api) { int r = -1; pa_assert(c); pa_assert(PA_REFCNT_VALUE(c) >= 1); PA_CHECK_VALIDITY(c, !pa_detect_fork(), PA_ERR_FORKED); PA_CHECK_VALIDITY(c, c->state == PA_CONTEXT_UNCONNECTED, PA_ERR_BADSTATE); PA_CHECK_VALIDITY(c, !(flags & ~(PA_CONTEXT_NOAUTOSPAWN|PA_CONTEXT_NOFAIL)), PA_ERR_INVALID); PA_CHECK_VALIDITY(c, !server || *server, PA_ERR_INVALID); if (server) c->conf->autospawn = FALSE; else server = c->conf->default_server; pa_context_ref(c); c->no_fail = !!(flags & PA_CONTEXT_NOFAIL); c->server_specified = !!server; pa_assert(!c->server_list); if (server) { if (!(c->server_list = pa_strlist_parse(server))) { pa_context_fail(c, PA_ERR_INVALIDSERVER); goto finish; } } else { char *d; /* Prepend in reverse order */ /* Follow the X display */ if (c->conf->auto_connect_display) { if ((d = getenv("DISPLAY"))) { d = pa_xstrndup(d, strcspn(d, ":")); if (*d) c->server_list = pa_strlist_prepend(c->server_list, d); pa_xfree(d); } } /* Add TCP/IP on the localhost */ if (c->conf->auto_connect_localhost) { c->server_list = pa_strlist_prepend(c->server_list, "tcp6:[::1]"); c->server_list = pa_strlist_prepend(c->server_list, "tcp4:127.0.0.1"); } /* The system wide instance via PF_LOCAL */ c->server_list = pa_strlist_prepend(c->server_list, PA_SYSTEM_RUNTIME_PATH PA_PATH_SEP PA_NATIVE_DEFAULT_UNIX_SOCKET); /* The user instance via PF_LOCAL */ c->server_list = prepend_per_user(c->server_list); } /* Set up autospawning */ if (!(flags & PA_CONTEXT_NOAUTOSPAWN) && c->conf->autospawn) { #ifdef HAVE_GETUID if (getuid() == 0) pa_log_debug("Not doing autospawn since we are root."); else { c->do_autospawn = TRUE; if (api) c->spawn_api = *api; } #endif } pa_context_set_state(c, PA_CONTEXT_CONNECTING); r = try_next_connection(c); finish: pa_context_unref(c); return r; }
static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) { pa_context *c = userdata; pa_assert(pd); pa_assert(c); pa_assert(c->state == PA_CONTEXT_AUTHORIZING || c->state == PA_CONTEXT_SETTING_NAME); pa_context_ref(c); if (command != PA_COMMAND_REPLY) { pa_context_handle_error(c, command, t, TRUE); goto finish; } switch(c->state) { case PA_CONTEXT_AUTHORIZING: { pa_tagstruct *reply; pa_bool_t shm_on_remote = FALSE; if (pa_tagstruct_getu32(t, &c->version) < 0 || !pa_tagstruct_eof(t)) { pa_context_fail(c, PA_ERR_PROTOCOL); goto finish; } /* Minimum supported version */ if (c->version < 8) { pa_context_fail(c, PA_ERR_VERSION); goto finish; } /* Starting with protocol version 13 the MSB of the version tag reflects if shm is available for this connection or not. */ if (c->version >= 13) { shm_on_remote = !!(c->version & 0x80000000U); c->version &= 0x7FFFFFFFU; } pa_log_debug("Protocol version: remote %u, local %u", c->version, PA_PROTOCOL_VERSION); /* Enable shared memory support if possible */ if (c->do_shm) if (c->version < 10 || (c->version >= 13 && !shm_on_remote)) c->do_shm = FALSE; if (c->do_shm) { /* Only enable SHM if both sides are owned by the same * user. This is a security measure because otherwise * data private to the user might leak. */ #ifdef HAVE_CREDS const pa_creds *creds; if (!(creds = pa_pdispatch_creds(pd)) || getuid() != creds->uid) c->do_shm = FALSE; #endif } pa_log_debug("Negotiated SHM: %s", pa_yes_no(c->do_shm)); pa_pstream_enable_shm(c->pstream, c->do_shm); reply = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag); if (c->version >= 13) { pa_init_proplist(c->proplist); pa_tagstruct_put_proplist(reply, c->proplist); } else pa_tagstruct_puts(reply, pa_proplist_gets(c->proplist, PA_PROP_APPLICATION_NAME)); pa_pstream_send_tagstruct(c->pstream, reply); pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c, NULL); pa_context_set_state(c, PA_CONTEXT_SETTING_NAME); break; } case PA_CONTEXT_SETTING_NAME : if ((c->version >= 13 && (pa_tagstruct_getu32(t, &c->client_index) < 0 || c->client_index == PA_INVALID_INDEX)) || !pa_tagstruct_eof(t)) { pa_context_fail(c, PA_ERR_PROTOCOL); goto finish; } pa_context_set_state(c, PA_CONTEXT_READY); break; default: pa_assert_not_reached(); } finish: pa_context_unref(c); }
static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) { pa_context *c = userdata; pa_assert(pd); pa_assert(c); pa_assert(c->state == PA_CONTEXT_AUTHORIZING || c->state == PA_CONTEXT_SETTING_NAME); pa_context_ref(c); if (command != PA_COMMAND_REPLY) { pa_context_handle_error(c, command, t, true); goto finish; } switch(c->state) { case PA_CONTEXT_AUTHORIZING: { pa_tagstruct *reply; bool shm_on_remote = false; bool memfd_on_remote = false; if (pa_tagstruct_getu32(t, &c->version) < 0 || !pa_tagstruct_eof(t)) { pa_context_fail(c, PA_ERR_PROTOCOL); goto finish; } /* Minimum supported version */ if (c->version < 8) { pa_context_fail(c, PA_ERR_VERSION); goto finish; } /* Starting with protocol version 13 the MSB of the version tag reflects if shm is available for this connection or not. */ if (c->version >= 13) { shm_on_remote = !!(c->version & 0x80000000U); /* Starting with protocol version 31, the second MSB of the version * tag reflects whether memfd is supported on the other PA end. */ if (c->version >= 31) memfd_on_remote = !!(c->version & 0x40000000U); /* Reserve the two most-significant _bytes_ of the version tag * for flags. */ c->version &= 0x0000FFFFU; } pa_log_debug("Protocol version: remote %u, local %u", c->version, PA_PROTOCOL_VERSION); /* Enable shared memory support if possible */ if (c->do_shm) if (c->version < 10 || (c->version >= 13 && !shm_on_remote)) c->do_shm = false; if (c->do_shm) { /* Only enable SHM if both sides are owned by the same * user. This is a security measure because otherwise * data private to the user might leak. */ #ifdef HAVE_CREDS const pa_creds *creds; if (!(creds = pa_pdispatch_creds(pd)) || getuid() != creds->uid) c->do_shm = false; #endif } pa_log_debug("Negotiated SHM: %s", pa_yes_no(c->do_shm)); pa_pstream_enable_shm(c->pstream, c->do_shm); c->shm_type = PA_MEM_TYPE_PRIVATE; if (c->do_shm) { if (c->version >= 31 && memfd_on_remote && c->memfd_on_local) { const char *reason; pa_pstream_enable_memfd(c->pstream); if (pa_mempool_is_memfd_backed(c->mempool)) if (pa_pstream_register_memfd_mempool(c->pstream, c->mempool, &reason)) pa_log("Failed to regester memfd mempool. Reason: %s", reason); /* Even if memfd pool registration fails, the negotiated SHM type * shall remain memfd as both endpoints claim to support it. */ c->shm_type = PA_MEM_TYPE_SHARED_MEMFD; } else c->shm_type = PA_MEM_TYPE_SHARED_POSIX; } pa_log_debug("Memfd possible: %s", pa_yes_no(c->memfd_on_local)); pa_log_debug("Negotiated SHM type: %s", pa_mem_type_to_string(c->shm_type)); reply = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag); if (c->version >= 13) { pa_init_proplist(c->proplist); pa_tagstruct_put_proplist(reply, c->proplist); } else pa_tagstruct_puts(reply, pa_proplist_gets(c->proplist, PA_PROP_APPLICATION_NAME)); pa_pstream_send_tagstruct(c->pstream, reply); pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c, NULL); pa_context_set_state(c, PA_CONTEXT_SETTING_NAME); break; } case PA_CONTEXT_SETTING_NAME : if ((c->version >= 13 && (pa_tagstruct_getu32(t, &c->client_index) < 0 || c->client_index == PA_INVALID_INDEX)) || !pa_tagstruct_eof(t)) { pa_context_fail(c, PA_ERR_PROTOCOL); goto finish; } pa_context_set_state(c, PA_CONTEXT_READY); break; default: pa_assert_not_reached(); } finish: pa_context_unref(c); }