src/pulsecore/protocol-http.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2005-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <assert.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include <pulse/util.h>
  34 #include <pulse/xmalloc.h>
  35
  36 #include <pulsecore/ioline.h>
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/namereg.h>
  39 #include <pulsecore/cli-text.h>
  40
  41 #include "protocol-http.h"
  42
  43 /* Don't allow more than this many concurrent connections */
  44 #define MAX_CONNECTIONS 10
  45
  46 #define internal_server_error(c) http_message((c), 500, "Internal Server Error", NULL)
  47
  48 #define URL_ROOT "/"
  49 #define URL_CSS "/style"
  50 #define URL_STATUS "/status"
  51
  52 struct connection {
  53     pa_protocol_http *protocol;
  54     pa_ioline *line;
  55     enum { REQUEST_LINE, MIME_HEADER, DATA } state;
  56     char *url;
  57 };
  58
  59 struct pa_protocol_http {
  60     pa_module *module;
  61     pa_core *core;
  62     pa_socket_server*server;
  63     pa_idxset *connections;
  64 };
  65
  66 static void http_response(struct connection *c, int code, const char *msg, const char *mime) {
  67     char s[256];
  68     assert(c);
  69     assert(msg);
  70     assert(mime);
  71
  72     snprintf(s, sizeof(s),
  73              "HTTP/1.0 %i %s\n"
  74              "Connection: close\n"
  75              "Content-Type: %s\n"
  76              "Cache-Control: no-cache\n"
  77              "Expires: 0\n"
  78              "Server: "PACKAGE_NAME"/"PACKAGE_VERSION"\n"
  79              "\n", code, msg, mime);
  80
  81     pa_ioline_puts(c->line, s);
  82 }
  83
  84 static void http_message(struct connection *c, int code, const char *msg, const char *text) {
  85     char s[256];
  86     assert(c);
  87
  88     http_response(c, code, msg, "text/html");
  89
  90     if (!text)
  91         text = msg;
  92
  93     snprintf(s, sizeof(s),
  94              "<?xml version=\"1.0\"?>\n"
  95              "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
  96              "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head><title>%s</title></head>\n"
  97              "<body>%s</body></html>\n",
  98              text, text);
  99
 100     pa_ioline_puts(c->line, s);
 101     pa_ioline_defer_close(c->line);
 102 }
 103
 104
 105 static void connection_free(struct connection *c, int del) {
 106     assert(c);
 107
 108     if (c->url)
 109         pa_xfree(c->url);
 110
 111     if (del)
 112         pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
 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     assert(line);
 120     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("Fully Qualified Domain Name:", pa_get_fqdn(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     assert(s && io && p);
 227
 228     if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
 229         pa_log_warn("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
 230         pa_iochannel_free(io);
 231         return;
 232     }
 233
 234     c = pa_xmalloc(sizeof(struct connection));
 235     c->protocol = p;
 236     c->line = pa_ioline_new(io);
 237     c->state = REQUEST_LINE;
 238     c->url = NULL;
 239
 240     pa_ioline_set_callback(c->line, line_callback, c);
 241     pa_idxset_put(p->connections, c, NULL);
 242 }
 243
 244 pa_protocol_http* pa_protocol_http_new(pa_core *core, pa_socket_server *server, pa_module *m, PA_GCC_UNUSED pa_modargs *ma) {
 245     pa_protocol_http* p;
 246     assert(core && server);
 247
 248     p = pa_xmalloc(sizeof(pa_protocol_http));
 249     p->module = m;
 250     p->core = core;
 251     p->server = server;
 252     p->connections = pa_idxset_new(NULL, NULL);
 253
 254     pa_socket_server_set_callback(p->server, on_connection, p);
 255
 256     return p;
 257 }
 258
 259 static void free_connection(void *p, PA_GCC_UNUSED void *userdata) {
 260     assert(p);
 261     connection_free(p, 0);
 262 }
 263
 264 void pa_protocol_http_free(pa_protocol_http *p) {
 265     assert(p);
 266
 267     pa_idxset_free(p->connections, free_connection, NULL);
 268     pa_socket_server_unref(p->server);
 269     pa_xfree(p);
 270 }