main/http.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*!
  20  * \file
  21  * \brief http server for AMI access
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * This program implements a tiny http server
  26  * and was inspired by micro-httpd by Jef Poskanzer
  27  *
  28  * GMime http://spruce.sourceforge.net/gmime/
  29  *
  30  * \ref AstHTTP - AMI over the http protocol
  31  */
  32
  33 /*! \li \ref http.c uses the configuration file \ref http.conf
  34  * \addtogroup configuration_file
  35  */
  36
  37 /*! \page http.conf http.conf
  38  * \verbinclude http.conf.sample
  39  */
  40
  41 /*** MODULEINFO
  42         <support_level>core</support_level>
  43  ***/
  44
  45 #include "asterisk.h"
  46
  47 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  48
  49 #include <time.h>
  50 #include <sys/time.h>
  51 #include <sys/stat.h>
  52 #include <sys/signal.h>
  53 #include <fcntl.h>
  54
  55 #include "asterisk/paths.h"     /* use ast_config_AST_DATA_DIR */
  56 #include "asterisk/cli.h"
  57 #include "asterisk/tcptls.h"
  58 #include "asterisk/http.h"
  59 #include "asterisk/utils.h"
  60 #include "asterisk/strings.h"
  61 #include "asterisk/config.h"
  62 #include "asterisk/stringfields.h"
  63 #include "asterisk/ast_version.h"
  64 #include "asterisk/manager.h"
  65 #include "asterisk/_private.h"
  66 #include "asterisk/astobj2.h"
  67 #include "asterisk/netsock2.h"
  68 #include "asterisk/json.h"
  69
  70 #define MAX_PREFIX 80
  71 #define DEFAULT_PORT 8088
  72 #define DEFAULT_TLS_PORT 8089
  73 #define DEFAULT_SESSION_LIMIT 100
  74 #define DEFAULT_SESSION_INACTIVITY 30000        /* (ms) Idle time waiting for data. */
  75
  76 static int session_limit = DEFAULT_SESSION_LIMIT;
  77 static int session_inactivity = DEFAULT_SESSION_INACTIVITY;
  78 static int session_count = 0;
  79
  80 static struct ast_tls_config http_tls_cfg;
  81
  82 static void *httpd_helper_thread(void *arg);
  83
  84 /*!
  85  * we have up to two accepting threads, one for http, one for https
  86  */
  87 static struct ast_tcptls_session_args http_desc = {
  88         .accept_fd = -1,
  89         .master = AST_PTHREADT_NULL,
  90         .tls_cfg = NULL,
  91         .poll_timeout = -1,
  92         .name = "http server",
  93         .accept_fn = ast_tcptls_server_root,
  94         .worker_fn = httpd_helper_thread,
  95 };
  96
  97 static struct ast_tcptls_session_args https_desc = {
  98         .accept_fd = -1,
  99         .master = AST_PTHREADT_NULL,
 100         .tls_cfg = &http_tls_cfg,
 101         .poll_timeout = -1,
 102         .name = "https server",
 103         .accept_fn = ast_tcptls_server_root,
 104         .worker_fn = httpd_helper_thread,
 105 };
 106
 107 static AST_RWLIST_HEAD_STATIC(uris, ast_http_uri);      /*!< list of supported handlers */
 108
 109 /* all valid URIs must be prepended by the string in prefix. */
 110 static char prefix[MAX_PREFIX];
 111 static int enablestatic;
 112
 113 /*! \brief Limit the kinds of files we're willing to serve up */
 114 static struct {
 115         const char *ext;
 116         const char *mtype;
 117 } mimetypes[] = {
 118         { "png", "image/png" },
 119         { "xml", "text/xml" },
 120         { "jpg", "image/jpeg" },
 121         { "js", "application/x-javascript" },
 122         { "wav", "audio/x-wav" },
 123         { "mp3", "audio/mpeg" },
 124         { "svg", "image/svg+xml" },
 125         { "svgz", "image/svg+xml" },
 126         { "gif", "image/gif" },
 127         { "html", "text/html" },
 128         { "htm", "text/html" },
 129         { "css", "text/css" },
 130         { "cnf", "text/plain" },
 131         { "cfg", "text/plain" },
 132         { "bin", "application/octet-stream" },
 133         { "sbn", "application/octet-stream" },
 134         { "ld", "application/octet-stream" },
 135 };
 136
 137 struct http_uri_redirect {
 138         AST_LIST_ENTRY(http_uri_redirect) entry;
 139         char *dest;
 140         char target[0];
 141 };
 142
 143 static AST_RWLIST_HEAD_STATIC(uri_redirects, http_uri_redirect);
 144
 145 static const struct ast_cfhttp_methods_text {
 146         enum ast_http_method method;
 147         const char *text;
 148 } ast_http_methods_text[] = {
 149         { AST_HTTP_UNKNOWN,     "UNKNOWN" },
 150         { AST_HTTP_GET,         "GET" },
 151         { AST_HTTP_POST,        "POST" },
 152         { AST_HTTP_HEAD,        "HEAD" },
 153         { AST_HTTP_PUT,         "PUT" },
 154         { AST_HTTP_DELETE,      "DELETE" },
 155         { AST_HTTP_OPTIONS,     "OPTIONS" },
 156 };
 157
 158 const char *ast_get_http_method(enum ast_http_method method)
 159 {
 160         int x;
 161
 162         for (x = 0; x < ARRAY_LEN(ast_http_methods_text); x++) {
 163                 if (ast_http_methods_text[x].method == method) {
 164                         return ast_http_methods_text[x].text;
 165                 }
 166         }
 167
 168         return NULL;
 169 }
 170
 171 const char *ast_http_ftype2mtype(const char *ftype)
 172 {
 173         int x;
 174
 175         if (ftype) {
 176                 for (x = 0; x < ARRAY_LEN(mimetypes); x++) {
 177                         if (!strcasecmp(ftype, mimetypes[x].ext)) {
 178                                 return mimetypes[x].mtype;
 179                         }
 180                 }
 181         }
 182         return NULL;
 183 }
 184
 185 uint32_t ast_http_manid_from_vars(struct ast_variable *headers)
 186 {
 187         uint32_t mngid = 0;
 188         struct ast_variable *v, *cookies;
 189
 190         cookies = ast_http_get_cookies(headers);
 191         for (v = cookies; v; v = v->next) {
 192                 if (!strcasecmp(v->name, "mansession_id")) {
 193                         sscanf(v->value, "%30x", &mngid);
 194                         break;
 195                 }
 196         }
 197         ast_variables_destroy(cookies);
 198         return mngid;
 199 }
 200
 201 void ast_http_prefix(char *buf, int len)
 202 {
 203         if (buf) {
 204                 ast_copy_string(buf, prefix, len);
 205         }
 206 }
 207
 208 static int static_callback(struct ast_tcptls_session_instance *ser,
 209         const struct ast_http_uri *urih, const char *uri,
 210         enum ast_http_method method, struct ast_variable *get_vars,
 211         struct ast_variable *headers)
 212 {
 213         char *path;
 214         const char *ftype;
 215         const char *mtype;
 216         char wkspace[80];
 217         struct stat st;
 218         int len;
 219         int fd;
 220         struct ast_str *http_header;
 221         struct timeval tv;
 222         struct ast_tm tm;
 223         char timebuf[80], etag[23];
 224         struct ast_variable *v;
 225         int not_modified = 0;
 226
 227         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 228                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 229                 return -1;
 230         }
 231
 232         /* Yuck.  I'm not really sold on this, but if you don't deliver static content it makes your configuration
 233            substantially more challenging, but this seems like a rather irritating feature creep on Asterisk. */
 234         if (!enablestatic || ast_strlen_zero(uri)) {
 235                 goto out403;
 236         }
 237
 238         /* Disallow any funny filenames at all (checking first character only??) */
 239         if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0])) {
 240                 goto out403;
 241         }
 242
 243         if (strstr(uri, "/..")) {
 244                 goto out403;
 245         }
 246
 247         if ((ftype = strrchr(uri, '.'))) {
 248                 ftype++;
 249         }
 250
 251         if (!(mtype = ast_http_ftype2mtype(ftype))) {
 252                 snprintf(wkspace, sizeof(wkspace), "text/%s", S_OR(ftype, "plain"));
 253                 mtype = wkspace;
 254         }
 255
 256         /* Cap maximum length */
 257         if ((len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5) > 1024) {
 258                 goto out403;
 259         }
 260
 261         path = ast_alloca(len);
 262         sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
 263         if (stat(path, &st)) {
 264                 goto out404;
 265         }
 266
 267         if (S_ISDIR(st.st_mode)) {
 268                 goto out404;
 269         }
 270
 271         if (strstr(path, "/private/") && !astman_is_authed(ast_http_manid_from_vars(headers))) {
 272                 goto out403;
 273         }
 274
 275         fd = open(path, O_RDONLY);
 276         if (fd < 0) {
 277                 goto out403;
 278         }
 279
 280         /* make "Etag:" http header value */
 281         snprintf(etag, sizeof(etag), "\"%ld\"", (long)st.st_mtime);
 282
 283         /* make "Last-Modified:" http header value */
 284         tv.tv_sec = st.st_mtime;
 285         tv.tv_usec = 0;
 286         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&tv, &tm, "GMT"));
 287
 288         /* check received "If-None-Match" request header and Etag value for file */
 289         for (v = headers; v; v = v->next) {
 290                 if (!strcasecmp(v->name, "If-None-Match")) {
 291                         if (!strcasecmp(v->value, etag)) {
 292                                 not_modified = 1;
 293                         }
 294                         break;
 295                 }
 296         }
 297
 298         if ( (http_header = ast_str_create(255)) == NULL) {
 299                 close(fd);
 300                 return -1;
 301         }
 302
 303         ast_str_set(&http_header, 0, "Content-type: %s\r\n"
 304                 "ETag: %s\r\n"
 305                 "Last-Modified: %s\r\n",
 306                 mtype,
 307                 etag,
 308                 timebuf);
 309
 310         /* ast_http_send() frees http_header, so we don't need to do it before returning */
 311         if (not_modified) {
 312                 ast_http_send(ser, method, 304, "Not Modified", http_header, NULL, 0, 1);
 313         } else {
 314                 ast_http_send(ser, method, 200, NULL, http_header, NULL, fd, 1); /* static content flag is set */
 315         }
 316         close(fd);
 317         return 0;
 318
 319 out404:
 320         ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
 321         return -1;
 322
 323 out403:
 324         ast_http_error(ser, 403, "Access Denied", "You do not have permission to access the requested URL.");
 325         return -1;
 326 }
 327
 328 static int httpstatus_callback(struct ast_tcptls_session_instance *ser,
 329         const struct ast_http_uri *urih, const char *uri,
 330         enum ast_http_method method, struct ast_variable *get_vars,
 331         struct ast_variable *headers)
 332 {
 333         struct ast_str *out;
 334         struct ast_variable *v, *cookies = NULL;
 335
 336         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 337                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 338                 return -1;
 339         }
 340
 341         if ( (out = ast_str_create(512)) == NULL) {
 342                 return -1;
 343         }
 344
 345         ast_str_append(&out, 0,
 346                 "<title>Asterisk HTTP Status</title>\r\n"
 347                 "<body bgcolor=\"#ffffff\">\r\n"
 348                 "<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
 349                 "<h2>&nbsp;&nbsp;Asterisk&trade; HTTP Status</h2></td></tr>\r\n");
 350
 351         ast_str_append(&out, 0, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
 352         ast_str_append(&out, 0, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
 353                        ast_sockaddr_stringify_addr(&http_desc.old_address));
 354         ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 355                        ast_sockaddr_stringify_port(&http_desc.old_address));
 356         if (http_tls_cfg.enabled) {
 357                 ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 358                                ast_sockaddr_stringify_port(&https_desc.old_address));
 359         }
 360         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 361         for (v = get_vars; v; v = v->next) {
 362                 ast_str_append(&out, 0, "<tr><td><i>Submitted GET Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 363         }
 364         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 365
 366         cookies = ast_http_get_cookies(headers);
 367         for (v = cookies; v; v = v->next) {
 368                 ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 369         }
 370         ast_variables_destroy(cookies);
 371
 372         ast_str_append(&out, 0, "</table><center><font size=\"-1\"><i>Asterisk and Digium are registered trademarks of Digium, Inc.</i></font></center></body>\r\n");
 373         ast_http_send(ser, method, 200, NULL, NULL, out, 0, 0);
 374         return 0;
 375 }
 376
 377 static struct ast_http_uri statusuri = {
 378         .callback = httpstatus_callback,
 379         .description = "Asterisk HTTP General Status",
 380         .uri = "httpstatus",
 381         .has_subtree = 0,
 382         .data = NULL,
 383         .key = __FILE__,
 384 };
 385
 386 static struct ast_http_uri staticuri = {
 387         .callback = static_callback,
 388         .description = "Asterisk HTTP Static Delivery",
 389         .uri = "static",
 390         .has_subtree = 1,
 391         .data = NULL,
 392         .key= __FILE__,
 393 };
 394
 395
 396 /* send http/1.1 response */
 397 /* free content variable and close socket*/
 398 void ast_http_send(struct ast_tcptls_session_instance *ser,
 399         enum ast_http_method method, int status_code, const char *status_title,
 400         struct ast_str *http_header, struct ast_str *out, const int fd,
 401         unsigned int static_content)
 402 {
 403         struct timeval now = ast_tvnow();
 404         struct ast_tm tm;
 405         char timebuf[80];
 406         int content_length = 0;
 407
 408         if (!ser || 0 == ser->f) {
 409                 return;
 410         }
 411
 412         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&now, &tm, "GMT"));
 413
 414         /* calc content length */
 415         if (out) {
 416                 content_length += ast_str_strlen(out);
 417         }
 418
 419         if (fd) {
 420                 content_length += lseek(fd, 0, SEEK_END);
 421                 lseek(fd, 0, SEEK_SET);
 422         }
 423
 424         /* send http header */
 425         fprintf(ser->f, "HTTP/1.1 %d %s\r\n"
 426                 "Server: Asterisk/%s\r\n"
 427                 "Date: %s\r\n"
 428                 "Connection: close\r\n"
 429                 "%s"
 430                 "Content-Length: %d\r\n"
 431                 "%s"
 432                 "\r\n",
 433                 status_code, status_title ? status_title : "OK",
 434                 ast_get_version(),
 435                 timebuf,
 436                 static_content ? "" : "Cache-Control: no-cache, no-store\r\n",
 437                 content_length,
 438                 http_header ? ast_str_buffer(http_header) : ""
 439                 );
 440
 441         /* send content */
 442         if (method != AST_HTTP_HEAD || status_code >= 400) {
 443                 if (out && ast_str_strlen(out)) {
 444                         if (fwrite(ast_str_buffer(out), ast_str_strlen(out), 1, ser->f) != 1) {
 445                                 ast_log(LOG_ERROR, "fwrite() failed: %s\n", strerror(errno));
 446                         }
 447                 }
 448
 449                 if (fd) {
 450                         char buf[256];
 451                         int len;
 452                         while ((len = read(fd, buf, sizeof(buf))) > 0) {
 453                                 if (fwrite(buf, len, 1, ser->f) != 1) {
 454                                         ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
 455                                         break;
 456                                 }
 457                         }
 458                 }
 459         }
 460
 461         if (http_header) {
 462                 ast_free(http_header);
 463         }
 464         if (out) {
 465                 ast_free(out);
 466         }
 467
 468         ast_tcptls_close_session_file(ser);
 469         return;
 470 }
 471
 472 /* Send http "401 Unauthorized" responce and close socket*/
 473 void ast_http_auth(struct ast_tcptls_session_instance *ser, const char *realm,
 474         const unsigned long nonce, const unsigned long opaque, int stale,
 475         const char *text)
 476 {
 477         struct ast_str *http_headers = ast_str_create(128);
 478         struct ast_str *out = ast_str_create(512);
 479
 480         if (!http_headers || !out) {
 481                 ast_free(http_headers);
 482                 ast_free(out);
 483                 return;
 484         }
 485
 486         ast_str_set(&http_headers, 0,
 487                 "WWW-authenticate: Digest algorithm=MD5, realm=\"%s\", nonce=\"%08lx\", qop=\"auth\", opaque=\"%08lx\"%s\r\n"
 488                 "Content-type: text/html\r\n",
 489                 realm ? realm : "Asterisk",
 490                 nonce,
 491                 opaque,
 492                 stale ? ", stale=true" : "");
 493
 494         ast_str_set(&out, 0,
 495                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 496                 "<html><head>\r\n"
 497                 "<title>401 Unauthorized</title>\r\n"
 498                 "</head><body>\r\n"
 499                 "<h1>401 Unauthorized</h1>\r\n"
 500                 "<p>%s</p>\r\n"
 501                 "<hr />\r\n"
 502                 "<address>Asterisk Server</address>\r\n"
 503                 "</body></html>\r\n",
 504                 text ? text : "");
 505
 506         ast_http_send(ser, AST_HTTP_UNKNOWN, 401, "Unauthorized", http_headers, out, 0, 0);
 507         return;
 508 }
 509
 510 /* send http error response and close socket*/
 511 void ast_http_error(struct ast_tcptls_session_instance *ser, int status_code, const char *status_title, const char *text)
 512 {
 513         struct ast_str *http_headers = ast_str_create(40);
 514         struct ast_str *out = ast_str_create(256);
 515
 516         if (!http_headers || !out) {
 517                 ast_free(http_headers);
 518                 ast_free(out);
 519                 return;
 520         }
 521
 522         ast_str_set(&http_headers, 0, "Content-type: text/html\r\n");
 523
 524         ast_str_set(&out, 0,
 525                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 526                 "<html><head>\r\n"
 527                 "<title>%d %s</title>\r\n"
 528                 "</head><body>\r\n"
 529                 "<h1>%s</h1>\r\n"
 530                 "<p>%s</p>\r\n"
 531                 "<hr />\r\n"
 532                 "<address>Asterisk Server</address>\r\n"
 533                 "</body></html>\r\n",
 534                         status_code, status_title, status_title, text);
 535
 536         ast_http_send(ser, AST_HTTP_UNKNOWN, status_code, status_title, http_headers, out, 0, 0);
 537         return;
 538 }
 539
 540 /*! \brief
 541  * Link the new uri into the list.
 542  *
 543  * They are sorted by length of
 544  * the string, not alphabetically. Duplicate entries are not replaced,
 545  * but the insertion order (using <= and not just <) makes sure that
 546  * more recent insertions hide older ones.
 547  * On a lookup, we just scan the list and stop at the first matching entry.
 548  */
 549 int ast_http_uri_link(struct ast_http_uri *urih)
 550 {
 551         struct ast_http_uri *uri;
 552         int len = strlen(urih->uri);
 553
 554         AST_RWLIST_WRLOCK(&uris);
 555
 556         if ( AST_RWLIST_EMPTY(&uris) || strlen(AST_RWLIST_FIRST(&uris)->uri) <= len ) {
 557                 AST_RWLIST_INSERT_HEAD(&uris, urih, entry);
 558                 AST_RWLIST_UNLOCK(&uris);
 559                 return 0;
 560         }
 561
 562         AST_RWLIST_TRAVERSE(&uris, uri, entry) {
 563                 if (AST_RWLIST_NEXT(uri, entry) &&
 564                         strlen(AST_RWLIST_NEXT(uri, entry)->uri) <= len) {
 565                         AST_RWLIST_INSERT_AFTER(&uris, uri, urih, entry);
 566                         AST_RWLIST_UNLOCK(&uris);
 567
 568                         return 0;
 569                 }
 570         }
 571
 572         AST_RWLIST_INSERT_TAIL(&uris, urih, entry);
 573
 574         AST_RWLIST_UNLOCK(&uris);
 575
 576         return 0;
 577 }
 578
 579 void ast_http_uri_unlink(struct ast_http_uri *urih)
 580 {
 581         AST_RWLIST_WRLOCK(&uris);
 582         AST_RWLIST_REMOVE(&uris, urih, entry);
 583         AST_RWLIST_UNLOCK(&uris);
 584 }
 585
 586 void ast_http_uri_unlink_all_with_key(const char *key)
 587 {
 588         struct ast_http_uri *urih;
 589         AST_RWLIST_WRLOCK(&uris);
 590         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&uris, urih, entry) {
 591                 if (!strcmp(urih->key, key)) {
 592                         AST_RWLIST_REMOVE_CURRENT(entry);
 593                         if (urih->dmallocd) {
 594                                 ast_free(urih->data);
 595                         }
 596                         if (urih->mallocd) {
 597                                 ast_free(urih);
 598                         }
 599                 }
 600         }
 601         AST_RWLIST_TRAVERSE_SAFE_END;
 602         AST_RWLIST_UNLOCK(&uris);
 603 }
 604
 605 #define MAX_POST_CONTENT 1025
 606
 607 /*!
 608  * \brief Retrieves the header with the given field name.
 609  *
 610  * \param headers Headers to search.
 611  * \param field_name Name of the header to find.
 612  * \return Associated header value.
 613  * \return \c NULL if header is not present.
 614  */
 615 static const char *get_header(struct ast_variable *headers,
 616         const char *field_name)
 617 {
 618         struct ast_variable *v;
 619
 620         for (v = headers; v; v = v->next) {
 621                 if (!strcasecmp(v->name, field_name)) {
 622                         return v->value;
 623                 }
 624         }
 625         return NULL;
 626 }
 627
 628 /*!
 629  * \brief Retrieves the content type specified in the "Content-Type" header.
 630  *
 631  * This function only returns the "type/subtype" and any trailing parameter is
 632  * not included.
 633  *
 634  * \note the return value is an allocated string that needs to be freed.
 635  *
 636  * \retval the content type/subtype or NULL if the header is not found.
 637  */
 638 static char *get_content_type(struct ast_variable *headers)
 639 {
 640         const char *content_type = get_header(headers, "Content-Type");
 641         const char *param;
 642         size_t size;
 643
 644         if (!content_type) {
 645                 return NULL;
 646         }
 647
 648         param = strchr(content_type, ';');
 649         size = param ? param - content_type : strlen(content_type);
 650
 651         return ast_strndup(content_type, size);
 652 }
 653
 654 /*!
 655  * \brief Returns the value of the Content-Length header.
 656  *
 657  * \param headers HTTP headers.
 658  * \return Value of the Content-Length header.
 659  * \return 0 if header is not present, or is invalid.
 660  */
 661 static int get_content_length(struct ast_variable *headers)
 662 {
 663         const char *content_length = get_header(headers, "Content-Length");
 664
 665         if (!content_length) {
 666                 /* Missing content length; assume zero */
 667                 return 0;
 668         }
 669
 670         /* atoi() will return 0 for invalid inputs, which is good enough for
 671          * the HTTP parsing. */
 672         return atoi(content_length);
 673 }
 674
 675 /*!
 676  * \brief Returns the value of the Transfer-Encoding header.
 677  *
 678  * \param headers HTTP headers.
 679  * \return Value of the Transfer-Encoding header.
 680  * \return 0 if header is not present, or is invalid.
 681  */
 682 static const char *get_transfer_encoding(struct ast_variable *headers)
 683 {
 684         return get_header(headers, "Transfer-Encoding");
 685 }
 686
 687 /*!
 688  * \brief decode chunked mode hexadecimal value
 689  *
 690  * \param s string to decode
 691  * \param len length of string
 692  * \return integer value or -1 for decode error
 693  */
 694 static int chunked_atoh(const char *s, int len)
 695 {
 696         int value = 0;
 697         char c;
 698
 699         if (*s < '0') {
 700                 /* zero value must be 0\n not just \n */
 701                 return -1;
 702         }
 703
 704         while (len--)
 705         {
 706                 if (*s == '\x0D') {
 707                         return value;
 708                 }
 709                 value <<= 4;
 710                 c = *s++;
 711                 if (c >= '0' && c <= '9') {
 712                         value += c - '0';
 713                         continue;
 714                 }
 715                 if (c >= 'a' && c <= 'f') {
 716                         value += 10 + c - 'a';
 717                         continue;
 718                 }
 719                 if (c >= 'A' && c <= 'F') {
 720                         value += 10 + c - 'A';
 721                         continue;
 722                 }
 723                 /* invalid character */
 724                 return -1;
 725         }
 726         /* end of string */
 727         return -1;
 728 }
 729
 730 /*!
 731  * \brief Returns the contents (body) of the HTTP request
 732  *
 733  * \param return_length ptr to int that returns content length
 734  * \param aser HTTP TCP/TLS session object
 735  * \param headers List of HTTP headers
 736  * \return ptr to content (zero terminated) or NULL on failure
 737  * \note Since returned ptr is malloc'd, it should be free'd by caller
 738  */
 739 static char *ast_http_get_contents(int *return_length,
 740         struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
 741 {
 742         const char *transfer_encoding;
 743         int res;
 744         int content_length = 0;
 745         int chunk_length;
 746         char chunk_header[8];
 747         int bufsize = 250;
 748         char *buf;
 749
 750         transfer_encoding = get_transfer_encoding(headers);
 751
 752         if (ast_strlen_zero(transfer_encoding) ||
 753                 strcasecmp(transfer_encoding, "chunked") != 0) {
 754                 /* handle regular non-chunked content */
 755                 content_length = get_content_length(headers);
 756                 if (content_length <= 0) {
 757                         /* no content - not an error */
 758                         return NULL;
 759                 }
 760                 if (content_length > MAX_POST_CONTENT - 1) {
 761                         ast_log(LOG_WARNING,
 762                                 "Excessively long HTTP content. (%d > %d)\n",
 763                                 content_length, MAX_POST_CONTENT);
 764                         errno = EFBIG;
 765                         return NULL;
 766                 }
 767                 buf = ast_malloc(content_length + 1);
 768                 if (!buf) {
 769                         /* Malloc sets ENOMEM */
 770                         return NULL;
 771                 }
 772                 res = fread(buf, 1, content_length, ser->f);
 773                 if (res < content_length) {
 774                         /* Error, distinguishable by ferror() or feof(), but neither
 775                          * is good. Treat either one as I/O error */
 776                         ast_log(LOG_WARNING, "Short HTTP request body (%d < %d)\n",
 777                                 res, content_length);
 778                         errno = EIO;
 779                         ast_free(buf);
 780                         return NULL;
 781                 }
 782                 buf[content_length] = 0;
 783                 *return_length = content_length;
 784                 return buf;
 785         }
 786
 787         /* pre-allocate buffer */
 788         buf = ast_malloc(bufsize);
 789         if (!buf) {
 790                 return NULL;
 791         }
 792
 793         /* handled chunked content */
 794         do {
 795                 /* get the line of hexadecimal giving chunk size */
 796                 if (!fgets(chunk_header, sizeof(chunk_header), ser->f)) {
 797                         ast_log(LOG_WARNING,
 798                                 "Short HTTP read of chunked header\n");
 799                         errno = EIO;
 800                         ast_free(buf);
 801                         return NULL;
 802                 }
 803                 chunk_length = chunked_atoh(chunk_header, sizeof(chunk_header));
 804                 if (chunk_length < 0) {
 805                         ast_log(LOG_WARNING, "Invalid HTTP chunk size\n");
 806                         errno = EIO;
 807                         ast_free(buf);
 808                         return NULL;
 809                 }
 810                 if (content_length + chunk_length > MAX_POST_CONTENT - 1) {
 811                         ast_log(LOG_WARNING,
 812                                 "Excessively long HTTP chunk. (%d + %d > %d)\n",
 813                                 content_length, chunk_length, MAX_POST_CONTENT);
 814                         errno = EFBIG;
 815                         ast_free(buf);
 816                         return NULL;
 817                 }
 818
 819                 /* insure buffer is large enough +1 */
 820                 if (content_length + chunk_length >= bufsize)
 821                 {
 822                         bufsize *= 2;
 823                         buf = ast_realloc(buf, bufsize);
 824                         if (!buf) {
 825                                 return NULL;
 826                         }
 827                 }
 828
 829                 /* read the chunk */
 830                 res = fread(buf + content_length, 1, chunk_length, ser->f);
 831                 if (res < chunk_length) {
 832                         ast_log(LOG_WARNING, "Short HTTP chunk read (%d < %d)\n",
 833                                 res, chunk_length);
 834                         errno = EIO;
 835                         ast_free(buf);
 836                         return NULL;
 837                 }
 838                 content_length += chunk_length;
 839
 840                 /* insure the next 2 bytes are CRLF */
 841                 res = fread(chunk_header, 1, 2, ser->f);
 842                 if (res < 2) {
 843                         ast_log(LOG_WARNING,
 844                                 "Short HTTP chunk sync read (%d < 2)\n", res);
 845                         errno = EIO;
 846                         ast_free(buf);
 847                         return NULL;
 848                 }
 849                 if (chunk_header[0] != 0x0D || chunk_header[1] != 0x0A) {
 850                         ast_log(LOG_WARNING,
 851                                 "Post HTTP chunk sync bytes wrong (%d, %d)\n",
 852                                 chunk_header[0], chunk_header[1]);
 853                         errno = EIO;
 854                         ast_free(buf);
 855                         return NULL;
 856                 }
 857         } while (chunk_length);
 858
 859         buf[content_length] = 0;
 860         *return_length = content_length;
 861         return buf;
 862 }
 863
 864 struct ast_json *ast_http_get_json(
 865         struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
 866 {
 867         int content_length = 0;
 868         struct ast_json *body;
 869         RAII_VAR(char *, buf, NULL, ast_free);
 870         RAII_VAR(char *, type, get_content_type(headers), ast_free);
 871
 872         /* Use errno to distinguish errors from no body */
 873         errno = 0;
 874
 875         if (ast_strlen_zero(type) || strcasecmp(type, "application/json")) {
 876                 /* Content type is not JSON */
 877                 return NULL;
 878         }
 879
 880         buf = ast_http_get_contents(&content_length, ser, headers);
 881         if (buf == NULL) {
 882                 /* errno already set */
 883                 return NULL;
 884         }
 885
 886         if (!content_length) {
 887                 /* it is not an error to have zero content */
 888                 return NULL;
 889         }
 890
 891         body = ast_json_load_buf(buf, content_length, NULL);
 892         if (body == NULL) {
 893                 /* Failed to parse JSON; treat as an I/O error */
 894                 errno = EIO;
 895                 return NULL;
 896         }
 897
 898         return body;
 899 }
 900
 901 /*
 902  * get post variables from client Request Entity-Body, if content type is
 903  * application/x-www-form-urlencoded
 904  */
 905 struct ast_variable *ast_http_get_post_vars(
 906         struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
 907 {
 908         int content_length = 0;
 909         struct ast_variable *v, *post_vars=NULL, *prev = NULL;
 910         char *var, *val;
 911         RAII_VAR(char *, buf, NULL, ast_free_ptr);
 912         RAII_VAR(char *, type, get_content_type(headers), ast_free);
 913
 914         /* Use errno to distinguish errors from no params */
 915         errno = 0;
 916
 917         if (ast_strlen_zero(type) ||
 918             strcasecmp(type, "application/x-www-form-urlencoded")) {
 919                 /* Content type is not form data */
 920                 return NULL;
 921         }
 922
 923         buf = ast_http_get_contents(&content_length, ser, headers);
 924         if (buf == NULL) {
 925                 return NULL;
 926         }
 927
 928         while ((val = strsep(&buf, "&"))) {
 929                 var = strsep(&val, "=");
 930                 if (val) {
 931                         ast_uri_decode(val, ast_uri_http_legacy);
 932                 } else  {
 933                         val = "";
 934                 }
 935                 ast_uri_decode(var, ast_uri_http_legacy);
 936                 if ((v = ast_variable_new(var, val, ""))) {
 937                         if (post_vars) {
 938                                 prev->next = v;
 939                         } else {
 940                                 post_vars = v;
 941                         }
 942                         prev = v;
 943                 }
 944         }
 945
 946         return post_vars;
 947 }
 948
 949 static int handle_uri(struct ast_tcptls_session_instance *ser, char *uri,
 950         enum ast_http_method method, struct ast_variable *headers)
 951 {
 952         char *c;
 953         int res = -1;
 954         char *params = uri;
 955         struct ast_http_uri *urih = NULL;
 956         int l;
 957         struct ast_variable *get_vars = NULL, *v, *prev = NULL;
 958         struct http_uri_redirect *redirect;
 959
 960         ast_debug(2, "HTTP Request URI is %s \n", uri);
 961
 962         strsep(&params, "?");
 963         /* Extract arguments from the request and store them in variables. */
 964         if (params) {
 965                 char *var, *val;
 966
 967                 while ((val = strsep(&params, "&"))) {
 968                         var = strsep(&val, "=");
 969                         if (val) {
 970                                 ast_uri_decode(val, ast_uri_http_legacy);
 971                         } else  {
 972                                 val = "";
 973                         }
 974                         ast_uri_decode(var, ast_uri_http_legacy);
 975                         if ((v = ast_variable_new(var, val, ""))) {
 976                                 if (get_vars) {
 977                                         prev->next = v;
 978                                 } else {
 979                                         get_vars = v;
 980                                 }
 981                                 prev = v;
 982                         }
 983                 }
 984         }
 985
 986         AST_RWLIST_RDLOCK(&uri_redirects);
 987         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
 988                 if (!strcasecmp(uri, redirect->target)) {
 989                         struct ast_str *http_header = ast_str_create(128);
 990                         ast_str_set(&http_header, 0, "Location: %s\r\n", redirect->dest);
 991                         ast_http_send(ser, method, 302, "Moved Temporarily", http_header, NULL, 0, 0);
 992
 993                         break;
 994                 }
 995         }
 996         AST_RWLIST_UNLOCK(&uri_redirects);
 997         if (redirect) {
 998                 goto cleanup;
 999         }
1000
1001         /* We want requests to start with the (optional) prefix and '/' */
1002         l = strlen(prefix);
1003         if (!strncasecmp(uri, prefix, l) && uri[l] == '/') {
1004                 uri += l + 1;
1005                 /* scan registered uris to see if we match one. */
1006                 AST_RWLIST_RDLOCK(&uris);
1007                 AST_RWLIST_TRAVERSE(&uris, urih, entry) {
1008                         l = strlen(urih->uri);
1009                         c = uri + l;    /* candidate */
1010                         ast_debug(2, "match request [%s] with handler [%s] len %d\n", uri, urih->uri, l);
1011                         if (strncasecmp(urih->uri, uri, l) /* no match */
1012                             || (*c && *c != '/')) { /* substring */
1013                                 continue;
1014                         }
1015                         if (*c == '/') {
1016                                 c++;
1017                         }
1018                         if (!*c || urih->has_subtree) {
1019                                 uri = c;
1020                                 break;
1021                         }
1022                 }
1023                 AST_RWLIST_UNLOCK(&uris);
1024         }
1025         if (urih) {
1026                 ast_debug(1, "Match made with [%s]\n", urih->uri);
1027                 if (!urih->no_decode_uri) {
1028                         ast_uri_decode(uri, ast_uri_http_legacy);
1029                 }
1030                 res = urih->callback(ser, urih, uri, method, get_vars, headers);
1031         } else {
1032                 ast_debug(1, "Requested URI [%s] has no handler\n", uri);
1033                 ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
1034         }
1035
1036 cleanup:
1037         ast_variables_destroy(get_vars);
1038         return res;
1039 }
1040
1041 static struct ast_variable *parse_cookies(const char *cookies)
1042 {
1043         char *parse = ast_strdupa(cookies);
1044         char *cur;
1045         struct ast_variable *vars = NULL, *var;
1046
1047         while ((cur = strsep(&parse, ";"))) {
1048                 char *name, *val;
1049
1050                 name = val = cur;
1051                 strsep(&val, "=");
1052
1053                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
1054                         continue;
1055                 }
1056
1057                 name = ast_strip(name);
1058                 val = ast_strip_quoted(val, "\"", "\"");
1059
1060                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
1061                         continue;
1062                 }
1063
1064                 ast_debug(1, "HTTP Cookie, Name: '%s'  Value: '%s'\n", name, val);
1065
1066                 var = ast_variable_new(name, val, __FILE__);
1067                 var->next = vars;
1068                 vars = var;
1069         }
1070
1071         return vars;
1072 }
1073
1074 /* get cookie from Request headers */
1075 struct ast_variable *ast_http_get_cookies(struct ast_variable *headers)
1076 {
1077         struct ast_variable *v, *cookies = NULL;
1078
1079         for (v = headers; v; v = v->next) {
1080                 if (!strcasecmp(v->name, "Cookie")) {
1081                         ast_variables_destroy(cookies);
1082                         cookies = parse_cookies(v->value);
1083                 }
1084         }
1085         return cookies;
1086 }
1087
1088 static struct ast_http_auth *auth_create(const char *userid,
1089         const char *password)
1090 {
1091         RAII_VAR(struct ast_http_auth *, auth, NULL, ao2_cleanup);
1092         size_t userid_len;
1093         size_t password_len;
1094
1095         if (!userid || !password) {
1096                 ast_log(LOG_ERROR, "Invalid userid/password\n");
1097                 return NULL;
1098         }
1099
1100         userid_len = strlen(userid) + 1;
1101         password_len = strlen(password) + 1;
1102
1103         /* Allocate enough room to store everything in one memory block */
1104         auth = ao2_alloc(sizeof(*auth) + userid_len + password_len, NULL);
1105         if (!auth) {
1106                 return NULL;
1107         }
1108
1109         /* Put the userid right after the struct */
1110         auth->userid = (char *)(auth + 1);
1111         strcpy(auth->userid, userid);
1112
1113         /* Put the password right after the userid */
1114         auth->password = auth->userid + userid_len;
1115         strcpy(auth->password, password);
1116
1117         ao2_ref(auth, +1);
1118         return auth;
1119 }
1120
1121 #define BASIC_PREFIX "Basic "
1122 #define BASIC_LEN 6 /*!< strlen(BASIC_PREFIX) */
1123
1124 struct ast_http_auth *ast_http_get_auth(struct ast_variable *headers)
1125 {
1126         struct ast_variable *v;
1127
1128         for (v = headers; v; v = v->next) {
1129                 const char *base64;
1130                 char decoded[256] = {};
1131                 char *username;
1132                 char *password;
1133 #ifdef AST_DEVMODE
1134                 int cnt;
1135 #endif /* AST_DEVMODE */
1136
1137                 if (strcasecmp("Authorization", v->name) != 0) {
1138                         continue;
1139                 }
1140
1141                 if (!ast_begins_with(v->value, BASIC_PREFIX)) {
1142                         ast_log(LOG_DEBUG,
1143                                 "Unsupported Authorization scheme\n");
1144                         continue;
1145                 }
1146
1147                 /* Basic auth header parsing. RFC 2617, section 2.
1148                  *   credentials = "Basic" basic-credentials
1149                  *   basic-credentials = base64-user-pass
1150                  *   base64-user-pass  = <base64 encoding of user-pass,
1151                  *                        except not limited to 76 char/line>
1152                  *   user-pass   = userid ":" password
1153                  */
1154
1155                 base64 = v->value + BASIC_LEN;
1156
1157                 /* This will truncate "userid:password" lines to
1158                  * sizeof(decoded). The array is long enough that this shouldn't
1159                  * be a problem */
1160 #ifdef AST_DEVMODE
1161                 cnt =
1162 #endif /* AST_DEVMODE */
1163                 ast_base64decode((unsigned char*)decoded, base64,
1164                         sizeof(decoded) - 1);
1165                 ast_assert(cnt < sizeof(decoded));
1166
1167                 /* Split the string at the colon */
1168                 password = decoded;
1169                 username = strsep(&password, ":");
1170                 if (!password) {
1171                         ast_log(LOG_WARNING, "Invalid Authorization header\n");
1172                         return NULL;
1173                 }
1174
1175                 return auth_create(username, password);
1176         }
1177
1178         return NULL;
1179 }
1180
1181 int ast_http_response_status_line(const char *buf, const char *version, int code)
1182 {
1183         int status_code;
1184         size_t size = strlen(version);
1185
1186         if (strncmp(buf, version, size) || buf[size] != ' ') {
1187                 ast_log(LOG_ERROR, "HTTP version not supported - "
1188                         "expected %s\n", version);
1189                 return -1;
1190         }
1191
1192         /* skip to status code (version + space) */
1193         buf += size + 1;
1194
1195         if (sscanf(buf, "%d", &status_code) != 1) {
1196                 ast_log(LOG_ERROR, "Could not read HTTP status code - "
1197                         "%s\n", buf);
1198                 return -1;
1199         }
1200
1201         return status_code;
1202 }
1203
1204 static void remove_excess_lws(char *s)
1205 {
1206         char *p, *res = s;
1207         char *buf = ast_malloc(strlen(s) + 1);
1208         char *buf_end;
1209
1210         if (!buf) {
1211                 return;
1212         }
1213
1214         buf_end = buf;
1215
1216         while (*s && *(s = ast_skip_blanks(s))) {
1217                 p = s;
1218                 s = ast_skip_nonblanks(s);
1219
1220                 if (buf_end != buf) {
1221                         *buf_end++ = ' ';
1222                 }
1223
1224                 memcpy(buf_end, p, s - p);
1225                 buf_end += s - p;
1226         }
1227         *buf_end = '\0';
1228         /* safe since buf will always be less than or equal to res */
1229         strcpy(res, buf);
1230         ast_free(buf);
1231 }
1232
1233 int ast_http_header_parse(char *buf, char **name, char **value)
1234 {
1235         ast_trim_blanks(buf);
1236         if (ast_strlen_zero(buf)) {
1237                 return -1;
1238         }
1239
1240         *value = buf;
1241         *name = strsep(value, ":");
1242         if (!*value) {
1243                 return 1;
1244         }
1245
1246         *value = ast_skip_blanks(*value);
1247         if (ast_strlen_zero(*value) || ast_strlen_zero(*name)) {
1248                 return 1;
1249         }
1250
1251         remove_excess_lws(*value);
1252         return 0;
1253 }
1254
1255 int ast_http_header_match(const char *name, const char *expected_name,
1256                           const char *value, const char *expected_value)
1257 {
1258         if (strcasecmp(name, expected_name)) {
1259                 /* no value to validate if names don't match */
1260                 return 0;
1261         }
1262
1263         if (strcasecmp(value, expected_value)) {
1264                 ast_log(LOG_ERROR, "Invalid header value - expected %s "
1265                         "received %s", value, expected_value);
1266                 return -1;
1267         }
1268         return 1;
1269 }
1270
1271 int ast_http_header_match_in(const char *name, const char *expected_name,
1272                              const char *value, const char *expected_value)
1273 {
1274         if (strcasecmp(name, expected_name)) {
1275                 /* no value to validate if names don't match */
1276                 return 0;
1277         }
1278
1279         if (!strcasestr(expected_value, value)) {
1280                 ast_log(LOG_ERROR, "Header '%s' - could not locate '%s' "
1281                         "in '%s'\n", name, value, expected_value);
1282                 return -1;
1283
1284         }
1285         return 1;
1286 }
1287
1288 /*! Limit the number of request headers in case the sender is being ridiculous. */
1289 #define MAX_HTTP_REQUEST_HEADERS        100
1290
1291 static void *httpd_helper_thread(void *data)
1292 {
1293         char buf[4096];
1294         char header_line[4096];
1295         struct ast_tcptls_session_instance *ser = data;
1296         struct ast_variable *headers = NULL;
1297         struct ast_variable *tail = headers;
1298         char *uri, *method;
1299         enum ast_http_method http_method = AST_HTTP_UNKNOWN;
1300         const char *transfer_encoding;
1301         int remaining_headers;
1302         int flags;
1303         struct protoent *p;
1304
1305         if (ast_atomic_fetchadd_int(&session_count, +1) >= session_limit) {
1306                 goto done;
1307         }
1308
1309         /* here we set TCP_NODELAY on the socket to disable Nagle's algorithm.
1310          * This is necessary to prevent delays (caused by buffering) as we
1311          * write to the socket in bits and pieces. */
1312         p = getprotobyname("tcp");
1313         if (p) {
1314                 int arg = 1;
1315                 if( setsockopt(ser->fd, p->p_proto, TCP_NODELAY, (char *)&arg, sizeof(arg) ) < 0 ) {
1316                         ast_log(LOG_WARNING, "Failed to set TCP_NODELAY on HTTP connection: %s\n", strerror(errno));
1317                         ast_log(LOG_WARNING, "Some HTTP requests may be slow to respond.\n");
1318                 }
1319         } else {
1320                 ast_log(LOG_WARNING, "Failed to set TCP_NODELAY on HTTP connection, getprotobyname(\"tcp\") failed\n");
1321                 ast_log(LOG_WARNING, "Some HTTP requests may be slow to respond.\n");
1322         }
1323
1324         /* make sure socket is non-blocking */
1325         flags = fcntl(ser->fd, F_GETFL);
1326         flags |= O_NONBLOCK;
1327         fcntl(ser->fd, F_SETFL, flags);
1328
1329         /* We can let the stream wait for data to arrive. */
1330         ast_tcptls_stream_set_exclusive_input(ser->stream_cookie, 1);
1331
1332         ast_tcptls_stream_set_timeout_inactivity(ser->stream_cookie, session_inactivity);
1333
1334         if (!fgets(buf, sizeof(buf), ser->f) || feof(ser->f)) {
1335                 goto done;
1336         }
1337
1338         /* Get method */
1339         method = ast_skip_blanks(buf);
1340         uri = ast_skip_nonblanks(method);
1341         if (*uri) {
1342                 *uri++ = '\0';
1343         }
1344
1345         if (!strcasecmp(method,"GET")) {
1346                 http_method = AST_HTTP_GET;
1347         } else if (!strcasecmp(method,"POST")) {
1348                 http_method = AST_HTTP_POST;
1349         } else if (!strcasecmp(method,"HEAD")) {
1350                 http_method = AST_HTTP_HEAD;
1351         } else if (!strcasecmp(method,"PUT")) {
1352                 http_method = AST_HTTP_PUT;
1353         } else if (!strcasecmp(method,"DELETE")) {
1354                 http_method = AST_HTTP_DELETE;
1355         } else if (!strcasecmp(method,"OPTIONS")) {
1356                 http_method = AST_HTTP_OPTIONS;
1357         }
1358
1359         uri = ast_skip_blanks(uri);     /* Skip white space */
1360
1361         if (*uri) {                     /* terminate at the first blank */
1362                 char *c = ast_skip_nonblanks(uri);
1363
1364                 if (*c) {
1365                         *c = '\0';
1366                 }
1367         } else {
1368                 ast_http_error(ser, 400, "Bad Request", "Invalid Request");
1369                 goto done;
1370         }
1371
1372         /* process "Request Headers" lines */
1373         remaining_headers = MAX_HTTP_REQUEST_HEADERS;
1374         for (;;) {
1375                 char *name;
1376                 char *value;
1377
1378                 if (!fgets(header_line, sizeof(header_line), ser->f) || feof(ser->f)) {
1379                         ast_http_error(ser, 400, "Bad Request", "Timeout");
1380                         goto done;
1381                 }
1382
1383                 /* Trim trailing characters */
1384                 ast_trim_blanks(header_line);
1385                 if (ast_strlen_zero(header_line)) {
1386                         /* A blank line ends the request header section. */
1387                         break;
1388                 }
1389
1390                 value = header_line;
1391                 name = strsep(&value, ":");
1392                 if (!value) {
1393                         continue;
1394                 }
1395
1396                 value = ast_skip_blanks(value);
1397                 if (ast_strlen_zero(value) || ast_strlen_zero(name)) {
1398                         continue;
1399                 }
1400
1401                 ast_trim_blanks(name);
1402
1403                 if (!remaining_headers--) {
1404                         /* Too many headers. */
1405                         ast_http_error(ser, 413, "Request Entity Too Large", "Too many headers");
1406                         goto done;
1407                 }
1408                 if (!headers) {
1409                         headers = ast_variable_new(name, value, __FILE__);
1410                         tail = headers;
1411                 } else {
1412                         tail->next = ast_variable_new(name, value, __FILE__);
1413                         tail = tail->next;
1414                 }
1415                 if (!tail) {
1416                         /*
1417                          * Variable allocation failure.
1418                          * Try to make some room.
1419                          */
1420                         ast_variables_destroy(headers);
1421                         headers = NULL;
1422
1423                         ast_http_error(ser, 500, "Server Error", "Out of memory");
1424                         goto done;
1425                 }
1426         }
1427
1428         transfer_encoding = get_transfer_encoding(headers);
1429         /* Transfer encoding defaults to identity */
1430         if (!transfer_encoding) {
1431                 transfer_encoding = "identity";
1432         }
1433
1434         /*
1435          * RFC 2616, section 3.6, we should respond with a 501 for any transfer-
1436          * codings we don't understand.
1437          */
1438         if (strcasecmp(transfer_encoding, "identity") != 0 &&
1439                 strcasecmp(transfer_encoding, "chunked") != 0) {
1440                 /* Transfer encodings not supported */
1441                 ast_http_error(ser, 501, "Unimplemented", "Unsupported Transfer-Encoding.");
1442                 goto done;
1443         }
1444
1445         handle_uri(ser, uri, http_method, headers);
1446
1447 done:
1448         ast_atomic_fetchadd_int(&session_count, -1);
1449
1450         /* clean up all the header information */
1451         ast_variables_destroy(headers);
1452
1453         if (ser->f) {
1454                 ast_tcptls_close_session_file(ser);
1455         }
1456         ao2_ref(ser, -1);
1457         ser = NULL;
1458         return NULL;
1459 }
1460
1461 /*!
1462  * \brief Add a new URI redirect
1463  * The entries in the redirect list are sorted by length, just like the list
1464  * of URI handlers.
1465  */
1466 static void add_redirect(const char *value)
1467 {
1468         char *target, *dest;
1469         struct http_uri_redirect *redirect, *cur;
1470         unsigned int target_len;
1471         unsigned int total_len;
1472
1473         dest = ast_strdupa(value);
1474         dest = ast_skip_blanks(dest);
1475         target = strsep(&dest, " ");
1476         target = ast_skip_blanks(target);
1477         target = strsep(&target, " "); /* trim trailing whitespace */
1478
1479         if (!dest) {
1480                 ast_log(LOG_WARNING, "Invalid redirect '%s'\n", value);
1481                 return;
1482         }
1483
1484         target_len = strlen(target) + 1;
1485         total_len = sizeof(*redirect) + target_len + strlen(dest) + 1;
1486
1487         if (!(redirect = ast_calloc(1, total_len))) {
1488                 return;
1489         }
1490         redirect->dest = redirect->target + target_len;
1491         strcpy(redirect->target, target);
1492         strcpy(redirect->dest, dest);
1493
1494         AST_RWLIST_WRLOCK(&uri_redirects);
1495
1496         target_len--; /* So we can compare directly with strlen() */
1497         if (AST_RWLIST_EMPTY(&uri_redirects)
1498                 || strlen(AST_RWLIST_FIRST(&uri_redirects)->target) <= target_len ) {
1499                 AST_RWLIST_INSERT_HEAD(&uri_redirects, redirect, entry);
1500                 AST_RWLIST_UNLOCK(&uri_redirects);
1501
1502                 return;
1503         }
1504
1505         AST_RWLIST_TRAVERSE(&uri_redirects, cur, entry) {
1506                 if (AST_RWLIST_NEXT(cur, entry)
1507                         && strlen(AST_RWLIST_NEXT(cur, entry)->target) <= target_len ) {
1508                         AST_RWLIST_INSERT_AFTER(&uri_redirects, cur, redirect, entry);
1509                         AST_RWLIST_UNLOCK(&uri_redirects);
1510                         return;
1511                 }
1512         }
1513
1514         AST_RWLIST_INSERT_TAIL(&uri_redirects, redirect, entry);
1515
1516         AST_RWLIST_UNLOCK(&uri_redirects);
1517 }
1518
1519 static int __ast_http_load(int reload)
1520 {
1521         struct ast_config *cfg;
1522         struct ast_variable *v;
1523         int enabled=0;
1524         int newenablestatic=0;
1525         char newprefix[MAX_PREFIX] = "";
1526         struct http_uri_redirect *redirect;
1527         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
1528         uint32_t bindport = DEFAULT_PORT;
1529         RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
1530         int num_addrs = 0;
1531         int http_tls_was_enabled = 0;
1532
1533         cfg = ast_config_load2("http.conf", "http", config_flags);
1534         if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
1535                 return 0;
1536         }
1537
1538         http_tls_was_enabled = (reload && http_tls_cfg.enabled);
1539
1540         http_tls_cfg.enabled = 0;
1541         if (http_tls_cfg.certfile) {
1542                 ast_free(http_tls_cfg.certfile);
1543         }
1544         http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);
1545
1546         if (http_tls_cfg.pvtfile) {
1547                 ast_free(http_tls_cfg.pvtfile);
1548         }
1549         http_tls_cfg.pvtfile = ast_strdup("");
1550
1551         if (http_tls_cfg.cipher) {
1552                 ast_free(http_tls_cfg.cipher);
1553         }
1554         http_tls_cfg.cipher = ast_strdup("");
1555
1556         AST_RWLIST_WRLOCK(&uri_redirects);
1557         while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
1558                 ast_free(redirect);
1559         }
1560         AST_RWLIST_UNLOCK(&uri_redirects);
1561
1562         ast_sockaddr_setnull(&https_desc.local_address);
1563
1564         session_limit = DEFAULT_SESSION_LIMIT;
1565         session_inactivity = DEFAULT_SESSION_INACTIVITY;
1566
1567         if (cfg) {
1568                 v = ast_variable_browse(cfg, "general");
1569                 for (; v; v = v->next) {
1570
1571                         /* read tls config options while preventing unsupported options from being set */
1572                         if (strcasecmp(v->name, "tlscafile")
1573                                 && strcasecmp(v->name, "tlscapath")
1574                                 && strcasecmp(v->name, "tlscadir")
1575                                 && strcasecmp(v->name, "tlsverifyclient")
1576                                 && strcasecmp(v->name, "tlsdontverifyserver")
1577                                 && strcasecmp(v->name, "tlsclientmethod")
1578                                 && strcasecmp(v->name, "sslclientmethod")
1579                                 && strcasecmp(v->name, "tlscipher")
1580                                 && strcasecmp(v->name, "sslcipher")
1581                                 && !ast_tls_read_conf(&http_tls_cfg, &https_desc, v->name, v->value)) {
1582                                 continue;
1583                         }
1584
1585                         if (!strcasecmp(v->name, "enabled")) {
1586                                 enabled = ast_true(v->value);
1587                         } else if (!strcasecmp(v->name, "enablestatic")) {
1588                                 newenablestatic = ast_true(v->value);
1589                         } else if (!strcasecmp(v->name, "bindport")) {
1590                                 if (ast_parse_arg(v->value, PARSE_UINT32 | PARSE_IN_RANGE | PARSE_DEFAULT, &bindport, DEFAULT_PORT, 0, 65535)) {
1591                                         ast_log(LOG_WARNING, "Invalid port %s specified. Using default port %"PRId32, v->value, DEFAULT_PORT);
1592                                 }
1593                         } else if (!strcasecmp(v->name, "bindaddr")) {
1594                                 if (!(num_addrs = ast_sockaddr_resolve(&addrs, v->value, 0, AST_AF_UNSPEC))) {
1595                                         ast_log(LOG_WARNING, "Invalid bind address %s\n", v->value);
1596                                 }
1597                         } else if (!strcasecmp(v->name, "prefix")) {
1598                                 if (!ast_strlen_zero(v->value)) {
1599                                         newprefix[0] = '/';
1600                                         ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
1601                                 } else {
1602                                         newprefix[0] = '\0';
1603                                 }
1604                         } else if (!strcasecmp(v->name, "redirect")) {
1605                                 add_redirect(v->value);
1606                         } else if (!strcasecmp(v->name, "sessionlimit")) {
1607                                 if (ast_parse_arg(v->value, PARSE_INT32|PARSE_DEFAULT|PARSE_IN_RANGE,
1608                                                         &session_limit, DEFAULT_SESSION_LIMIT, 1, INT_MAX)) {
1609                                         ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
1610                                                         v->name, v->value, v->lineno);
1611                                 }
1612                         } else if (!strcasecmp(v->name, "session_inactivity")) {
1613                                 if (ast_parse_arg(v->value, PARSE_INT32 |PARSE_DEFAULT | PARSE_IN_RANGE,
1614                                         &session_inactivity, DEFAULT_SESSION_INACTIVITY, 1, INT_MAX)) {
1615                                         ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
1616                                                 v->name, v->value, v->lineno);
1617                                 }
1618                         } else {
1619                                 ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
1620                         }
1621                 }
1622
1623                 ast_config_destroy(cfg);
1624         }
1625
1626         if (strcmp(prefix, newprefix)) {
1627                 ast_copy_string(prefix, newprefix, sizeof(prefix));
1628         }
1629         enablestatic = newenablestatic;
1630
1631         if (num_addrs && enabled) {
1632                 int i;
1633                 for (i = 0; i < num_addrs; ++i) {
1634                         ast_sockaddr_copy(&http_desc.local_address, &addrs[i]);
1635                         if (!ast_sockaddr_port(&http_desc.local_address)) {
1636                                 ast_sockaddr_set_port(&http_desc.local_address, bindport);
1637                         }
1638                         ast_tcptls_server_start(&http_desc);
1639                         if (http_desc.accept_fd == -1) {
1640                                 ast_log(LOG_WARNING, "Failed to start HTTP server for address %s\n", ast_sockaddr_stringify(&addrs[i]));
1641                                 ast_sockaddr_setnull(&http_desc.local_address);
1642                         } else {
1643                                 ast_verb(1, "Bound HTTP server to address %s\n", ast_sockaddr_stringify(&addrs[i]));
1644                                 break;
1645                         }
1646                 }
1647                 /* When no specific TLS bindaddr is specified, we just use
1648                  * the non-TLS bindaddress here.
1649                  */
1650                 if (ast_sockaddr_isnull(&https_desc.local_address) && http_desc.accept_fd != -1) {
1651                         ast_sockaddr_copy(&https_desc.local_address, &https_desc.local_address);
1652                         /* Of course, we can't use the same port though.
1653                          * Since no bind address was specified, we just use the
1654                          * default TLS port
1655                          */
1656                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1657                 }
1658         }
1659         if (http_tls_was_enabled && !http_tls_cfg.enabled) {
1660                 ast_tcptls_server_stop(&https_desc);
1661         } else if (http_tls_cfg.enabled && !ast_sockaddr_isnull(&https_desc.local_address)) {
1662                 /* We can get here either because a TLS-specific address was specified
1663                  * or because we copied the non-TLS address here. In the case where
1664                  * we read an explicit address from the config, there may have been
1665                  * no port specified, so we'll just use the default TLS port.
1666                  */
1667                 if (!ast_sockaddr_port(&https_desc.local_address)) {
1668                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1669                 }
1670                 if (ast_ssl_setup(https_desc.tls_cfg)) {
1671                         ast_tcptls_server_start(&https_desc);
1672                 }
1673         }
1674
1675         return 0;
1676 }
1677
1678 static char *handle_show_http(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1679 {
1680         struct ast_http_uri *urih;
1681         struct http_uri_redirect *redirect;
1682
1683         switch (cmd) {
1684         case CLI_INIT:
1685                 e->command = "http show status";
1686                 e->usage =
1687                         "Usage: http show status\n"
1688                         "       Lists status of internal HTTP engine\n";
1689                 return NULL;
1690         case CLI_GENERATE:
1691                 return NULL;
1692         }
1693
1694         if (a->argc != 3) {
1695                 return CLI_SHOWUSAGE;
1696         }
1697         ast_cli(a->fd, "HTTP Server Status:\n");
1698         ast_cli(a->fd, "Prefix: %s\n", prefix);
1699         if (ast_sockaddr_isnull(&http_desc.old_address)) {
1700                 ast_cli(a->fd, "Server Disabled\n\n");
1701         } else {
1702                 ast_cli(a->fd, "Server Enabled and Bound to %s\n\n",
1703                         ast_sockaddr_stringify(&http_desc.old_address));
1704                 if (http_tls_cfg.enabled) {
1705                         ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s\n\n",
1706                                 ast_sockaddr_stringify(&https_desc.old_address));
1707                 }
1708         }
1709
1710         ast_cli(a->fd, "Enabled URI's:\n");
1711         AST_RWLIST_RDLOCK(&uris);
1712         if (AST_RWLIST_EMPTY(&uris)) {
1713                 ast_cli(a->fd, "None.\n");
1714         } else {
1715                 AST_RWLIST_TRAVERSE(&uris, urih, entry)
1716                         ast_cli(a->fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
1717         }
1718         AST_RWLIST_UNLOCK(&uris);
1719
1720         ast_cli(a->fd, "\nEnabled Redirects:\n");
1721         AST_RWLIST_RDLOCK(&uri_redirects);
1722         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry)
1723                 ast_cli(a->fd, "  %s => %s\n", redirect->target, redirect->dest);
1724         if (AST_RWLIST_EMPTY(&uri_redirects)) {
1725                 ast_cli(a->fd, "  None.\n");
1726         }
1727         AST_RWLIST_UNLOCK(&uri_redirects);
1728
1729         return CLI_SUCCESS;
1730 }
1731
1732 int ast_http_reload(void)
1733 {
1734         return __ast_http_load(1);
1735 }
1736
1737 static struct ast_cli_entry cli_http[] = {
1738         AST_CLI_DEFINE(handle_show_http, "Display HTTP server status"),
1739 };
1740
1741 static void http_shutdown(void)
1742 {
1743         struct http_uri_redirect *redirect;
1744         ast_cli_unregister_multiple(cli_http, ARRAY_LEN(cli_http));
1745
1746         ast_tcptls_server_stop(&http_desc);
1747         if (http_tls_cfg.enabled) {
1748                 ast_tcptls_server_stop(&https_desc);
1749         }
1750         ast_free(http_tls_cfg.certfile);
1751         ast_free(http_tls_cfg.pvtfile);
1752         ast_free(http_tls_cfg.cipher);
1753
1754         ast_http_uri_unlink(&statusuri);
1755         ast_http_uri_unlink(&staticuri);
1756
1757         AST_RWLIST_WRLOCK(&uri_redirects);
1758         while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
1759                 ast_free(redirect);
1760         }
1761         AST_RWLIST_UNLOCK(&uri_redirects);
1762 }
1763
1764 int ast_http_init(void)
1765 {
1766         ast_http_uri_link(&statusuri);
1767         ast_http_uri_link(&staticuri);
1768         ast_cli_register_multiple(cli_http, ARRAY_LEN(cli_http));
1769         ast_register_atexit(http_shutdown);
1770
1771         return __ast_http_load(0);
1772 }