src/pulsecore/protocol-http.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 <assert.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include <pulse/util.h>
  32 #include <pulse/xmalloc.h>
  33
  34 #include <pulsecore/ioline.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     assert(c);
  67     assert(msg);
  68     assert(mime);
  69
  70     snprintf(s, sizeof(s),
  71              "HTTP/1.0 %i %s\n"
  72              "Connection: close\n"
  73              "Content-Type: %s\n"
  74              "Cache-Control: no-cache\n"
  75              "Expires: 0\n"
  76              "Server: "PACKAGE_NAME"/"PACKAGE_VERSION"\n"
  77              "\n", code, msg, mime);
  78
  79     pa_ioline_puts(c->line, s);
  80 }
  81
  82 static void http_message(struct connection *c, int code, const char *msg, const char *text) {
  83     char s[256];
  84     assert(c);
  85
  86     http_response(c, code, msg, "text/html");
  87
  88     if (!text)
  89         text = msg;
  90
  91     snprintf(s, sizeof(s),
  92              "<?xml version=\"1.0\"?>\n"
  93              "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
  94              "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head><title>%s</title></head>\n"
  95              "<body>%s</body></html>\n",
  96              text, text);
  97
  98     pa_ioline_puts(c->line, s);
  99     pa_ioline_defer_close(c->line);
 100 }
 101
 102
 103 static void connection_free(struct connection *c, int del) {
 104     assert(c);
 105
 106     if (c->url)
 107         pa_xfree(c->url);
 108
 109     if (del)
 110         pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
 111     pa_ioline_unref(c->line);
 112     pa_xfree(c);
 113 }
 114
 115 static void line_callback(pa_ioline *line, const char *s, void *userdata) {
 116     struct connection *c = userdata;
 117     assert(line);
 118     assert(c);
 119
 120     if (!s) {
 121         /* EOF */
 122         connection_free(c, 1);
 123         return;
 124     }
 125
 126     switch (c->state) {
 127         case REQUEST_LINE: {
 128             if (memcmp(s, "GET ", 4))
 129                 goto fail;
 130
 131             s +=4;
 132
 133             c->url = pa_xstrndup(s, strcspn(s, " \r\n\t?"));
 134             c->state = MIME_HEADER;
 135             break;
 136
 137         }
 138
 139         case MIME_HEADER: {
 140
 141             /* Ignore MIME headers */
 142             if (strcspn(s, " \r\n") != 0)
 143                 break;
 144
 145             /* We're done */
 146             c->state = DATA;
 147
 148             pa_log_info("request for %s", c->url);
 149
 150             if (!strcmp(c->url, URL_ROOT)) {
 151                 char txt[256];
 152                 http_response(c, 200, "OK", "text/html");
 153
 154                 pa_ioline_puts(c->line,
 155                                "<?xml version=\"1.0\"?>\n"
 156                                "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
 157                                "<html xmlns=\"http://www.w3.org/1999/xhtml\"><title>"PACKAGE_NAME" "PACKAGE_VERSION"</title>\n"
 158                                "<link rel=\"stylesheet\" type=\"text/css\" href=\"style\"/></head><body>\n");
 159
 160                 pa_ioline_puts(c->line,
 161                                "<h1>"PACKAGE_NAME" "PACKAGE_VERSION"</h1>\n"
 162                                "<table>");
 163
 164 #define PRINTF_FIELD(a,b) pa_ioline_printf(c->line, "<tr><td><b>%s</b></td><td>%s</td></tr>\n",(a),(b))
 165
 166                 PRINTF_FIELD("User Name:", pa_get_user_name(txt, sizeof(txt)));
 167                 PRINTF_FIELD("Fully Qualified Domain Name:", pa_get_fqdn(txt, sizeof(txt)));
 168                 PRINTF_FIELD("Default Sample Specification:", pa_sample_spec_snprint(txt, sizeof(txt), &c->protocol->core->default_sample_spec));
 169                 PRINTF_FIELD("Default Sink:", pa_namereg_get_default_sink_name(c->protocol->core));
 170                 PRINTF_FIELD("Default Source:", pa_namereg_get_default_source_name(c->protocol->core));
 171
 172                 pa_ioline_puts(c->line, "</table>");
 173
 174                 pa_ioline_puts(c->line, "<p><a href=\"/status\">Click here</a> for an extensive server status report.</p>");
 175
 176                 pa_ioline_puts(c->line, "</body></html>\n");
 177
 178                 pa_ioline_defer_close(c->line);
 179             } else if (!strcmp(c->url, URL_CSS)) {
 180                 http_response(c, 200, "OK", "text/css");
 181
 182                 pa_ioline_puts(c->line,
 183                                "body { color: black; background-color: white; margin: 0.5cm; }\n"
 184                                "a:link, a:visited { color: #900000; }\n"
 185                                "p { margin-left: 0.5cm; margin-right: 0.5cm; }\n"
 186                                "h1 { color: #00009F; }\n"
 187                                "h2 { color: #00009F; }\n"
 188                                "ul { margin-left: .5cm; }\n"
 189                                "ol { margin-left: .5cm; }\n"
 190                                "pre { margin-left: .5cm; background-color: #f0f0f0; padding: 0.4cm;}\n"
 191                                ".grey { color: #afafaf; }\n"
 192                                "table {  margin-left: 1cm; border:1px solid lightgrey; padding: 0.2cm; }\n"
 193                                "td { padding-left:10px; padding-right:10px;  }\n");
 194
 195                 pa_ioline_defer_close(c->line);
 196             } else if (!strcmp(c->url, URL_STATUS)) {
 197                 char *r;
 198
 199                 http_response(c, 200, "OK", "text/plain");
 200                 r = pa_full_status_string(c->protocol->core);
 201                 pa_ioline_puts(c->line, r);
 202                 pa_xfree(r);
 203
 204                 pa_ioline_defer_close(c->line);
 205             } else
 206                 http_message(c, 404, "Not Found", NULL);
 207
 208             break;
 209         }
 210
 211         default:
 212             ;
 213     }
 214
 215     return;
 216
 217 fail:
 218     internal_server_error(c);
 219 }
 220
 221 static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata) {
 222     pa_protocol_http *p = userdata;
 223     struct connection *c;
 224     assert(s && io && p);
 225
 226     if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
 227         pa_log_warn("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
 228         pa_iochannel_free(io);
 229         return;
 230     }
 231
 232     c = pa_xmalloc(sizeof(struct connection));
 233     c->protocol = p;
 234     c->line = pa_ioline_new(io);
 235     c->state = REQUEST_LINE;
 236     c->url = NULL;
 237
 238     pa_ioline_set_callback(c->line, line_callback, c);
 239     pa_idxset_put(p->connections, c, NULL);
 240 }
 241
 242 pa_protocol_http* pa_protocol_http_new(pa_core *core, pa_socket_server *server, pa_module *m, PA_GCC_UNUSED pa_modargs *ma) {
 243     pa_protocol_http* p;
 244     assert(core && server);
 245
 246     p = pa_xmalloc(sizeof(pa_protocol_http));
 247     p->module = m;
 248     p->core = core;
 249     p->server = server;
 250     p->connections = pa_idxset_new(NULL, NULL);
 251
 252     pa_socket_server_set_callback(p->server, on_connection, p);
 253
 254     return p;
 255 }
 256
 257 static void free_connection(void *p, PA_GCC_UNUSED void *userdata) {
 258     assert(p);
 259     connection_free(p, 0);
 260 }
 261
 262 void pa_protocol_http_free(pa_protocol_http *p) {
 263     assert(p);
 264
 265     pa_idxset_free(p->connections, free_connection, NULL);
 266     pa_socket_server_unref(p->server);
 267     pa_xfree(p);
 268 }