/*** This file is part of PulseAudio. Copyright 2005-2009 Lennart Poettering 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 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 #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "protocol-http.h" /* Don't allow more than this many concurrent connections */ #define MAX_CONNECTIONS 10 #define URL_ROOT "/" #define URL_CSS "/style" #define URL_STATUS "/status" #define URL_LISTEN "/listen" #define URL_LISTEN_SOURCE "/listen/source/" #define MIME_HTML "text/html; charset=utf-8" #define MIME_TEXT "text/plain; charset=utf-8" #define MIME_CSS "text/css" #define HTML_HEADER(t) \ "\n" \ "\n" \ "\n" \ " \n" \ " "t"\n" \ " \n" \ " \n" \ " \n" #define HTML_FOOTER \ " \n" \ "\n" #define RECORD_BUFFER_SECONDS (5) #define DEFAULT_SOURCE_LATENCY (300*PA_USEC_PER_MSEC) enum state { STATE_REQUEST_LINE, STATE_MIME_HEADER, STATE_DATA }; struct connection { pa_http_protocol *protocol; pa_iochannel *io; pa_ioline *line; pa_memblockq *output_memblockq; pa_source_output *source_output; pa_client *client; enum state state; char *url; pa_module *module; }; struct pa_http_protocol { PA_REFCNT_DECLARE; pa_core *core; pa_idxset *connections; pa_strlist *servers; }; enum { SOURCE_OUTPUT_MESSAGE_POST_DATA = PA_SOURCE_OUTPUT_MESSAGE_MAX }; /* Called from main context */ static void connection_unlink(struct connection *c) { pa_assert(c); if (c->source_output) { pa_source_output_unlink(c->source_output); c->source_output->userdata = NULL; pa_source_output_unref(c->source_output); } if (c->client) pa_client_free(c->client); pa_xfree(c->url); if (c->line) pa_ioline_unref(c->line); if (c->io) pa_iochannel_free(c->io); if (c->output_memblockq) pa_memblockq_free(c->output_memblockq); pa_idxset_remove_by_data(c->protocol->connections, c, NULL); pa_xfree(c); } /* Called from main context */ static int do_write(struct connection *c) { pa_memchunk chunk; ssize_t r; void *p; pa_assert(c); if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0) return 0; pa_assert(chunk.memblock); pa_assert(chunk.length > 0); p = pa_memblock_acquire(chunk.memblock); r = pa_iochannel_write(c->io, (uint8_t*) p+chunk.index, chunk.length); pa_memblock_release(chunk.memblock); pa_memblock_unref(chunk.memblock); if (r < 0) { if (errno == EINTR || errno == EAGAIN) return 0; pa_log("write(): %s", pa_cstrerror(errno)); return -1; } pa_memblockq_drop(c->output_memblockq, (size_t) r); return 0; } /* Called from main context */ static void do_work(struct connection *c) { pa_assert(c); if (pa_iochannel_is_hungup(c->io)) goto fail; if (pa_iochannel_is_writable(c->io)) if (do_write(c) < 0) goto fail; return; fail: connection_unlink(c); } /* Called from thread context, except when it is not */ static int source_output_process_msg(pa_msgobject *m, int code, void *userdata, int64_t offset, pa_memchunk *chunk) { pa_source_output *o = PA_SOURCE_OUTPUT(m); struct connection *c; pa_source_output_assert_ref(o); if (!(c = o->userdata)) return -1; switch (code) { case SOURCE_OUTPUT_MESSAGE_POST_DATA: /* While this function is usually called from IO thread * context, this specific command is not! */ pa_memblockq_push_align(c->output_memblockq, chunk); do_work(c); break; default: return pa_source_output_process_msg(m, code, userdata, offset, chunk); } return 0; } /* Called from thread context */ static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) { struct connection *c; pa_source_output_assert_ref(o); pa_assert_se(c = o->userdata); pa_assert(chunk); pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(o), SOURCE_OUTPUT_MESSAGE_POST_DATA, NULL, 0, chunk, NULL); } /* Called from main context */ static void source_output_kill_cb(pa_source_output *o) { struct connection*c; pa_source_output_assert_ref(o); pa_assert_se(c = o->userdata); connection_unlink(c); } /* Called from main context */ static pa_usec_t source_output_get_latency_cb(pa_source_output *o) { struct connection*c; pa_source_output_assert_ref(o); pa_assert_se(c = o->userdata); return pa_bytes_to_usec(pa_memblockq_get_length(c->output_memblockq), &c->source_output->sample_spec); } /*** client callbacks ***/ static void client_kill_cb(pa_client *client) { struct connection*c; pa_assert(client); pa_assert_se(c = client->userdata); connection_unlink(c); } /*** pa_iochannel callbacks ***/ static void io_callback(pa_iochannel*io, void *userdata) { struct connection *c = userdata; pa_assert(c); pa_assert(io); do_work(c); } static char *escape_html(const char *t) { pa_strbuf *sb; const char *p, *e; sb = pa_strbuf_new(); for (e = p = t; *p; p++) { if (*p == '>' || *p == '<' || *p == '&') { if (p > e) { pa_strbuf_putsn(sb, e, p-e); e = p + 1; } if (*p == '>') pa_strbuf_puts(sb, ">"); else if (*p == '<') pa_strbuf_puts(sb, "<"); else pa_strbuf_puts(sb, "&"); } } if (p > e) pa_strbuf_putsn(sb, e, p-e); return pa_strbuf_tostring_free(sb); } static void http_response( struct connection *c, int code, const char *msg, const char *mime) { char *s; pa_assert(c); pa_assert(msg); pa_assert(mime); s = pa_sprintf_malloc( "HTTP/1.0 %i %s\n" "Connection: close\n" "Content-Type: %s\n" "Cache-Control: no-cache\n" "Expires: 0\n" "Server: "PACKAGE_NAME"/"PACKAGE_VERSION"\n" "\n", code, msg, mime); pa_ioline_puts(c->line, s); pa_xfree(s); } static void html_response( struct connection *c, int code, const char *msg, const char *text) { char *s; pa_assert(c); http_response(c, code, msg, MIME_HTML); if (!text) text = msg; s = pa_sprintf_malloc( HTML_HEADER("%s") "%s" HTML_FOOTER, text, text); pa_ioline_puts(c->line, s); pa_xfree(s); pa_ioline_defer_close(c->line); } static void html_print_field(pa_ioline *line, const char *left, const char *right) { char *eleft, *eright; eleft = escape_html(left); eright = escape_html(right); pa_ioline_printf(line, "%s" "%s\n", eleft, eright); pa_xfree(eleft); pa_xfree(eright); } static void handle_root(struct connection *c) { char *t; pa_assert(c); http_response(c, 200, "OK", MIME_HTML); pa_ioline_puts(c->line, HTML_HEADER(PACKAGE_NAME" "PACKAGE_VERSION) "

"PACKAGE_NAME" "PACKAGE_VERSION"

\n" "\n"); t = pa_get_user_name_malloc(); html_print_field(c->line, "User Name:", t); pa_xfree(t); t = pa_get_host_name_malloc(); html_print_field(c->line, "Host name:", t); pa_xfree(t); t = pa_machine_id(); html_print_field(c->line, "Machine ID:", t); pa_xfree(t); t = pa_uname_string(); html_print_field(c->line, "System:", t); pa_xfree(t); t = pa_sprintf_malloc("%lu", (unsigned long) getpid()); html_print_field(c->line, "Process ID:", t); pa_xfree(t); pa_ioline_puts(c->line, "

\n" "

Show an extensive server status report

\n" "

Monitor sinks and sources

\n" HTML_FOOTER); pa_ioline_defer_close(c->line); } static void handle_css(struct connection *c) { pa_assert(c); http_response(c, 200, "OK", MIME_CSS); pa_ioline_puts(c->line, "body { color: black; background-color: white; }\n" "a:link, a:visited { color: #900000; }\n" "div.news-date { font-size: 80%; font-style: italic; }\n" "pre { background-color: #f0f0f0; padding: 0.4cm; }\n" ".grey { color: #8f8f8f; font-size: 80%; }" "table { margin-left: 1cm; border:1px solid lightgrey; padding: 0.2cm; }\n" "td { padding-left:10px; padding-right:10px; }\n"); pa_ioline_defer_close(c->line); } static void handle_status(struct connection *c) { char *r; pa_assert(c); http_response(c, 200, "OK", MIME_TEXT); r = pa_full_status_string(c->protocol->core); pa_ioline_puts(c->line, r); pa_xfree(r); pa_ioline_defer_close(c->line); } static void handle_listen(struct connection *c) { pa_source *source; pa_sink *sink; uint32_t idx; http_response(c, 200, "OK", MIME_HTML); pa_ioline_puts(c->line, HTML_HEADER("Listen") "

Sinks

\n" "

\n"); PA_IDXSET_FOREACH(sink, c->protocol->core->sinks, idx) { char *t, *m; t = escape_html(pa_strna(pa_proplist_gets(sink->proplist, PA_PROP_DEVICE_DESCRIPTION))); m = pa_sample_spec_to_mime_type_mimefy(&sink->sample_spec, &sink->channel_map); pa_ioline_printf(c->line, "%s
\n", sink->monitor_source->name, m, t); pa_xfree(t); pa_xfree(m); } pa_ioline_puts(c->line, "

\n" "

Sources

\n" "

\n"); PA_IDXSET_FOREACH(source, c->protocol->core->sources, idx) { char *t, *m; if (source->monitor_of) continue; t = escape_html(pa_strna(pa_proplist_gets(source->proplist, PA_PROP_DEVICE_DESCRIPTION))); m = pa_sample_spec_to_mime_type_mimefy(&source->sample_spec, &source->channel_map); pa_ioline_printf(c->line, "%s
\n", source->name, m, t); pa_xfree(m); pa_xfree(t); } pa_ioline_puts(c->line, "

\n" HTML_FOOTER); pa_ioline_defer_close(c->line); } static void line_drain_callback(pa_ioline *l, void *userdata) { struct connection *c; pa_assert(l); pa_assert_se(c = userdata); /* We don't need the line reader anymore, instead we need a real * binary io channel */ pa_assert_se(c->io = pa_ioline_detach_iochannel(c->line)); pa_iochannel_set_callback(c->io, io_callback, c); pa_iochannel_socket_set_sndbuf(c->io, pa_memblockq_get_length(c->output_memblockq)); pa_ioline_unref(c->line); c->line = NULL; } static void handle_listen_prefix(struct connection *c, const char *source_name) { pa_source *source; pa_source_output_new_data data; pa_sample_spec ss; pa_channel_map cm; char *t; size_t l; pa_assert(c); pa_assert(source_name); pa_assert(c->line); pa_assert(!c->io); if (!(source = pa_namereg_get(c->protocol->core, source_name, PA_NAMEREG_SOURCE))) { html_response(c, 404, "Source not found", NULL); return; } ss = source->sample_spec; cm = source->channel_map; pa_sample_spec_mimefy(&ss, &cm); pa_source_output_new_data_init(&data); data.driver = __FILE__; data.module = c->module; data.client = c->client; data.source = source; pa_proplist_update(data.proplist, PA_UPDATE_MERGE, c->client->proplist); pa_source_output_new_data_set_sample_spec(&data, &ss); pa_source_output_new_data_set_channel_map(&data, &cm); pa_source_output_new(&c->source_output, c->protocol->core, &data); pa_source_output_new_data_done(&data); if (!c->source_output) { html_response(c, 403, "Cannot create source output", NULL); return; } c->source_output->parent.process_msg = source_output_process_msg; c->source_output->push = source_output_push_cb; c->source_output->kill = source_output_kill_cb; c->source_output->get_latency = source_output_get_latency_cb; c->source_output->userdata = c; pa_source_output_set_requested_latency(c->source_output, DEFAULT_SOURCE_LATENCY); l = (size_t) (pa_bytes_per_second(&ss)*RECORD_BUFFER_SECONDS); c->output_memblockq = pa_memblockq_new( 0, l, 0, pa_frame_size(&ss), 1, 0, 0, NULL); pa_source_output_put(c->source_output); t = pa_sample_spec_to_mime_type(&ss, &cm); http_response(c, 200, "OK", t); pa_xfree(t); pa_ioline_set_callback(c->line, NULL, NULL); if (pa_ioline_is_drained(c->line)) line_drain_callback(c->line, c); else pa_ioline_set_drain_callback(c->line, line_drain_callback, c); } static void handle_url(struct connection *c) { pa_assert(c); pa_log_debug("Request for %s", c->url); if (pa_streq(c->url, URL_ROOT)) handle_root(c); else if (pa_streq(c->url, URL_CSS)) handle_css(c); else if (pa_streq(c->url, URL_STATUS)) handle_status(c); else if (pa_streq(c->url, URL_LISTEN)) handle_listen(c); else if (pa_startswith(c->url, URL_LISTEN_SOURCE)) handle_listen_prefix(c, c->url + sizeof(URL_LISTEN_SOURCE)-1); else html_response(c, 404, "Not Found", NULL); } static void line_callback(pa_ioline *line, const char *s, void *userdata) { struct connection *c = userdata; pa_assert(line); pa_assert(c); if (!s) { /* EOF */ connection_unlink(c); return; } switch (c->state) { case STATE_REQUEST_LINE: { if (!pa_startswith(s, "GET ")) goto fail; s +=4; c->url = pa_xstrndup(s, strcspn(s, " \r\n\t?")); c->state = STATE_MIME_HEADER; break; } case STATE_MIME_HEADER: { /* Ignore MIME headers */ if (strcspn(s, " \r\n") != 0) break; /* We're done */ c->state = STATE_DATA; handle_url(c); break; } default: ; } return; fail: html_response(c, 500, "Internal Server Error", NULL); } void pa_http_protocol_connect(pa_http_protocol *p, pa_iochannel *io, pa_module *m) { struct connection *c; pa_client_new_data client_data; char pname[128]; pa_assert(p); pa_assert(io); pa_assert(m); if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) { pa_log("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS); pa_iochannel_free(io); return; } c = pa_xnew0(struct connection, 1); c->protocol = p; c->state = STATE_REQUEST_LINE; c->module = m; c->line = pa_ioline_new(io); pa_ioline_set_callback(c->line, line_callback, c); pa_client_new_data_init(&client_data); client_data.module = c->module; client_data.driver = __FILE__; pa_iochannel_socket_peer_to_string(io, pname, sizeof(pname)); pa_proplist_setf(client_data.proplist, PA_PROP_APPLICATION_NAME, "HTTP client (%s)", pname); pa_proplist_sets(client_data.proplist, "http-protocol.peer", pname); c->client = pa_client_new(p->core, &client_data); pa_client_new_data_done(&client_data); if (!c->client) goto fail; c->client->kill = client_kill_cb; c->client->userdata = c; pa_idxset_put(p->connections, c, NULL); return; fail: if (c) connection_unlink(c); } void pa_http_protocol_disconnect(pa_http_protocol *p, pa_module *m) { struct connection *c; uint32_t idx; pa_assert(p); pa_assert(m); PA_IDXSET_FOREACH(c, p->connections, idx) if (c->module == m) connection_unlink(c); } static pa_http_protocol* http_protocol_new(pa_core *c) { pa_http_protocol *p; pa_assert(c); p = pa_xnew0(pa_http_protocol, 1); PA_REFCNT_INIT(p); p->core = c; p->connections = pa_idxset_new(NULL, NULL); pa_assert_se(pa_shared_set(c, "http-protocol", p) >= 0); return p; } pa_http_protocol* pa_http_protocol_get(pa_core *c) { pa_http_protocol *p; if ((p = pa_shared_get(c, "http-protocol"))) return pa_http_protocol_ref(p); return http_protocol_new(c); } pa_http_protocol* pa_http_protocol_ref(pa_http_protocol *p) { pa_assert(p); pa_assert(PA_REFCNT_VALUE(p) >= 1); PA_REFCNT_INC(p); return p; } void pa_http_protocol_unref(pa_http_protocol *p) { struct connection *c; pa_assert(p); pa_assert(PA_REFCNT_VALUE(p) >= 1); if (PA_REFCNT_DEC(p) > 0) return; while ((c = pa_idxset_first(p->connections, NULL))) connection_unlink(c); pa_idxset_free(p->connections, NULL, NULL); pa_strlist_free(p->servers); pa_assert_se(pa_shared_remove(p->core, "http-protocol") >= 0); pa_xfree(p); } void pa_http_protocol_add_server_string(pa_http_protocol *p, const char *name) { pa_assert(p); pa_assert(PA_REFCNT_VALUE(p) >= 1); pa_assert(name); p->servers = pa_strlist_prepend(p->servers, name); } void pa_http_protocol_remove_server_string(pa_http_protocol *p, const char *name) { pa_assert(p); pa_assert(PA_REFCNT_VALUE(p) >= 1); pa_assert(name); p->servers = pa_strlist_remove(p->servers, name); } pa_strlist *pa_http_protocol_servers(pa_http_protocol *p) { pa_assert(p); pa_assert(PA_REFCNT_VALUE(p) >= 1); return p->servers; }