code.delx.au - pulseaudio/blob - src/pulsecore/protocol-http.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2005-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include <pulse/util.h>
  31 #include <pulse/xmalloc.h>
  32
  33 #include <pulsecore/ioline.h>
  34 #include <pulsecore/macro.h>
  35 #include <pulsecore/log.h>
  36 #include <pulsecore/namereg.h>
  37 #include <pulsecore/cli-text.h>
  38
  39 #include "protocol-http.h"
  40
  41 /* Don't allow more than this many concurrent connections */
  42 #define MAX_CONNECTIONS 10
  43
  44 #define internal_server_error(c) http_message((c), 500, "Internal Server Error", NULL)
  45
  46 #define URL_ROOT "/"
  47 #define URL_CSS "/style"
  48 #define URL_STATUS "/status"
  49
  50 struct connection {
  51     pa_protocol_http *protocol;
  52     pa_ioline *line;
  53     enum { REQUEST_LINE, MIME_HEADER, DATA } state;
  54     char *url;
  55 };
  56
  57 struct pa_protocol_http {
  58     pa_module *module;
  59     pa_core *core;
  60     pa_socket_server*server;
  61     pa_idxset *connections;
  62 };
  63
  64 static void http_response(struct connection *c, int code, const char *msg, const char *mime) {
  65     char s[256];
  66
  67     pa_assert(c);
  68     pa_assert(msg);
  69     pa_assert(mime);
  70
  71     pa_snprintf(s, sizeof(s),
  72              "HTTP/1.0 %i %s\n"
  73              "Connection: close\n"
  74              "Content-Type: %s\n"
  75              "Cache-Control: no-cache\n"
  76              "Expires: 0\n"
  77              "Server: "PACKAGE_NAME"/"PACKAGE_VERSION"\n"
  78              "\n", code, msg, mime);
  79
  80     pa_ioline_puts(c->line, s);
  81 }
  82
  83 static void http_message(struct connection *c, int code, const char *msg, const char *text) {
  84     char s[256];
  85     pa_assert(c);
  86
  87     http_response(c, code, msg, "text/html");
  88
  89     if (!text)
  90         text = msg;
  91
  92     pa_snprintf(s, sizeof(s),
  93              "<?xml version=\"1.0\"?>\n"
  94              "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
  95              "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head><title>%s</title></head>\n"
  96              "<body>%s</body></html>\n",
  97              text, text);
  98
  99     pa_ioline_puts(c->line, s);
 100     pa_ioline_defer_close(c->line);
 101 }
 102
 103
 104 static void connection_free(struct connection *c, int del) {
 105     pa_assert(c);
 106
 107     if (c->url)
 108         pa_xfree(c->url);
 109
 110     if (del)
 111         pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
 112
 113     pa_ioline_unref(c->line);
 114     pa_xfree(c);
 115 }
 116
 117 static void line_callback(pa_ioline *line, const char *s, void *userdata) {
 118     struct connection *c = userdata;
 119     pa_assert(line);
 120     pa_assert(c);
 121
 122     if (!s) {
 123         /* EOF */
 124         connection_free(c, 1);
 125         return;
 126     }
 127
 128     switch (c->state) {
 129         case REQUEST_LINE: {
 130             if (memcmp(s, "GET ", 4))
 131                 goto fail;
 132
 133             s +=4;
 134
 135             c->url = pa_xstrndup(s, strcspn(s, " \r\n\t?"));
 136             c->state = MIME_HEADER;
 137             break;
 138
 139         }
 140
 141         case MIME_HEADER: {
 142
 143             /* Ignore MIME headers */
 144             if (strcspn(s, " \r\n") != 0)
 145                 break;
 146
 147             /* We're done */
 148             c->state = DATA;
 149
 150             pa_log_info("request for %s", c->url);
 151
 152             if (!strcmp(c->url, URL_ROOT)) {
 153                 char txt[256];
 154                 http_response(c, 200, "OK", "text/html");
 155
 156                 pa_ioline_puts(c->line,
 157                                "<?xml version=\"1.0\"?>\n"
 158                                "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
 159                                "<html xmlns=\"http://www.w3.org/1999/xhtml\"><title>"PACKAGE_NAME" "PACKAGE_VERSION"</title>\n"
 160                                "<link rel=\"stylesheet\" type=\"text/css\" href=\"style\"/></head><body>\n");
 161
 162                 pa_ioline_puts(c->line,
 163                                "<h1>"PACKAGE_NAME" "PACKAGE_VERSION"</h1>\n"
 164                                "<table>");
 165
 166 #define PRINTF_FIELD(a,b) pa_ioline_printf(c->line, "<tr><td><b>%s</b></td><td>%s</td></tr>\n",(a),(b))
 167
 168                 PRINTF_FIELD("User Name:", pa_get_user_name(txt, sizeof(txt)));
 169                 PRINTF_FIELD("Host name:", pa_get_host_name(txt, sizeof(txt)));
 170                 PRINTF_FIELD("Default Sample Specification:", pa_sample_spec_snprint(txt, sizeof(txt), &c->protocol->core->default_sample_spec));
 171                 PRINTF_FIELD("Default Sink:", pa_namereg_get_default_sink_name(c->protocol->core));
 172                 PRINTF_FIELD("Default Source:", pa_namereg_get_default_source_name(c->protocol->core));
 173
 174                 pa_ioline_puts(c->line, "</table>");
 175
 176                 pa_ioline_puts(c->line, "<p><a href=\"/status\">Click here</a> for an extensive server status report.</p>");
 177
 178                 pa_ioline_puts(c->line, "</body></html>\n");
 179
 180                 pa_ioline_defer_close(c->line);
 181             } else if (!strcmp(c->url, URL_CSS)) {
 182                 http_response(c, 200, "OK", "text/css");
 183
 184                 pa_ioline_puts(c->line,
 185                                "body { color: black; background-color: white; margin: 0.5cm; }\n"
 186                                "a:link, a:visited { color: #900000; }\n"
 187                                "p { margin-left: 0.5cm; margin-right: 0.5cm; }\n"
 188                                "h1 { color: #00009F; }\n"
 189                                "h2 { color: #00009F; }\n"
 190                                "ul { margin-left: .5cm; }\n"
 191                                "ol { margin-left: .5cm; }\n"
 192                                "pre { margin-left: .5cm; background-color: #f0f0f0; padding: 0.4cm;}\n"
 193                                ".grey { color: #afafaf; }\n"
 194                                "table {  margin-left: 1cm; border:1px solid lightgrey; padding: 0.2cm; }\n"
 195                                "td { padding-left:10px; padding-right:10px;  }\n");
 196
 197                 pa_ioline_defer_close(c->line);
 198             } else if (!strcmp(c->url, URL_STATUS)) {
 199                 char *r;
 200
 201                 http_response(c, 200, "OK", "text/plain");
 202                 r = pa_full_status_string(c->protocol->core);
 203                 pa_ioline_puts(c->line, r);
 204                 pa_xfree(r);
 205
 206                 pa_ioline_defer_close(c->line);
 207             } else
 208                 http_message(c, 404, "Not Found", NULL);
 209
 210             break;
 211         }
 212
 213         default:
 214             ;
 215     }
 216
 217     return;
 218
 219 fail:
 220     internal_server_error(c);
 221 }
 222
 223 static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata) {
 224     pa_protocol_http *p = userdata;
 225     struct connection *c;
 226
 227     pa_assert(s);
 228     pa_assert(io);
 229     pa_assert(p);
 230
 231     if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
 232         pa_log_warn("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
 233         pa_iochannel_free(io);
 234         return;
 235     }
 236
 237     c = pa_xnew(struct connection, 1);
 238     c->protocol = p;
 239     c->line = pa_ioline_new(io);
 240     c->state = REQUEST_LINE;
 241     c->url = NULL;
 242
 243     pa_ioline_set_callback(c->line, line_callback, c);
 244     pa_idxset_put(p->connections, c, NULL);
 245 }
 246
 247 pa_protocol_http* pa_protocol_http_new(pa_core *core, pa_socket_server *server, pa_module *m, PA_GCC_UNUSED pa_modargs *ma) {
 248     pa_protocol_http* p;
 249
 250     pa_core_assert_ref(core);
 251     pa_assert(server);
 252
 253     p = pa_xnew(pa_protocol_http, 1);
 254     p->module = m;
 255     p->core = core;
 256     p->server = pa_socket_server_ref(server);
 257     p->connections = pa_idxset_new(NULL, NULL);
 258
 259     pa_socket_server_set_callback(p->server, on_connection, p);
 260
 261     return p;
 262 }
 263
 264 static void free_connection(void *p, PA_GCC_UNUSED void *userdata) {
 265     pa_assert(p);
 266     connection_free(p, 0);
 267 }
 268
 269 void pa_protocol_http_free(pa_protocol_http *p) {
 270     pa_assert(p);
 271
 272     pa_idxset_free(p->connections, free_connection, NULL);
 273     pa_socket_server_unref(p->server);
 274     pa_xfree(p);
 275 }