Mon Oct 8 12:39:03 2012

Asterisk developer's documentation


http.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*!
00020  * \file
00021  * \brief http server for AMI access
00022  *
00023  * \author Mark Spencer <markster@digium.com>
00024  *
00025  * This program implements a tiny http server
00026  * and was inspired by micro-httpd by Jef Poskanzer
00027  *
00028  * \extref GMime http://spruce.sourceforge.net/gmime/
00029  *
00030  * \ref AstHTTP - AMI over the http protocol
00031  */
00032 
00033 /*** MODULEINFO
00034    <support_level>core</support_level>
00035  ***/
00036 
00037 #include "asterisk.h"
00038 
00039 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 366650 $")
00040 
00041 #include <time.h>
00042 #include <sys/time.h>
00043 #include <sys/stat.h>
00044 #include <sys/signal.h>
00045 #include <fcntl.h>
00046 
00047 #include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
00048 #include "asterisk/network.h"
00049 #include "asterisk/cli.h"
00050 #include "asterisk/tcptls.h"
00051 #include "asterisk/http.h"
00052 #include "asterisk/utils.h"
00053 #include "asterisk/strings.h"
00054 #include "asterisk/config.h"
00055 #include "asterisk/stringfields.h"
00056 #include "asterisk/ast_version.h"
00057 #include "asterisk/manager.h"
00058 #include "asterisk/_private.h"
00059 #include "asterisk/astobj2.h"
00060 
00061 #define MAX_PREFIX 80
00062 #define DEFAULT_SESSION_LIMIT 100
00063 
00064 #define DEFAULT_HTTP_PORT 8088
00065 #define DEFAULT_HTTPS_PORT 8089
00066 
00067 /* See http.h for more information about the SSL implementation */
00068 #if defined(HAVE_OPENSSL) && (defined(HAVE_FUNOPEN) || defined(HAVE_FOPENCOOKIE))
00069 #define  DO_SSL   /* comment in/out if you want to support ssl */
00070 #endif
00071 
00072 static int session_limit = DEFAULT_SESSION_LIMIT;
00073 static int session_count = 0;
00074 
00075 static struct ast_tls_config http_tls_cfg;
00076 
00077 static void *httpd_helper_thread(void *arg);
00078 
00079 /*!
00080  * we have up to two accepting threads, one for http, one for https
00081  */
00082 static struct ast_tcptls_session_args http_desc = {
00083    .accept_fd = -1,
00084    .master = AST_PTHREADT_NULL,
00085    .tls_cfg = NULL,
00086    .poll_timeout = -1,
00087    .name = "http server",
00088    .accept_fn = ast_tcptls_server_root,
00089    .worker_fn = httpd_helper_thread,
00090 };
00091 
00092 static struct ast_tcptls_session_args https_desc = {
00093    .accept_fd = -1,
00094    .master = AST_PTHREADT_NULL,
00095    .tls_cfg = &http_tls_cfg,
00096    .poll_timeout = -1,
00097    .name = "https server",
00098    .accept_fn = ast_tcptls_server_root,
00099    .worker_fn = httpd_helper_thread,
00100 };
00101 
00102 static AST_RWLIST_HEAD_STATIC(uris, ast_http_uri); /*!< list of supported handlers */
00103 
00104 /* all valid URIs must be prepended by the string in prefix. */
00105 static char prefix[MAX_PREFIX];
00106 static int enablestatic;
00107 
00108 /*! \brief Limit the kinds of files we're willing to serve up */
00109 static struct {
00110    const char *ext;
00111    const char *mtype;
00112 } mimetypes[] = {
00113    { "png", "image/png" },
00114    { "xml", "text/xml" },
00115    { "jpg", "image/jpeg" },
00116    { "js", "application/x-javascript" },
00117    { "wav", "audio/x-wav" },
00118    { "mp3", "audio/mpeg" },
00119    { "svg", "image/svg+xml" },
00120    { "svgz", "image/svg+xml" },
00121    { "gif", "image/gif" },
00122    { "html", "text/html" },
00123    { "htm", "text/html" },
00124    { "css", "text/css" },
00125    { "cnf", "text/plain" },
00126    { "cfg", "text/plain" },
00127    { "bin", "application/octet-stream" },
00128    { "sbn", "application/octet-stream" },
00129    { "ld", "application/octet-stream" },
00130 };
00131 
00132 struct http_uri_redirect {
00133    AST_LIST_ENTRY(http_uri_redirect) entry;
00134    char *dest;
00135    char target[0];
00136 };
00137 
00138 static AST_RWLIST_HEAD_STATIC(uri_redirects, http_uri_redirect);
00139 
00140 static const struct ast_cfhttp_methods_text {
00141    enum ast_http_method method;
00142    const char *text;
00143 } ast_http_methods_text[] = {
00144    { AST_HTTP_UNKNOWN,     "UNKNOWN" },
00145    { AST_HTTP_GET,         "GET" },
00146    { AST_HTTP_POST,        "POST" },
00147    { AST_HTTP_HEAD,        "HEAD" },
00148    { AST_HTTP_PUT,         "PUT" },
00149 };
00150 
00151 const char *ast_get_http_method(enum ast_http_method method)
00152 {
00153    int x;
00154 
00155    for (x = 0; x < ARRAY_LEN(ast_http_methods_text); x++) {
00156       if (ast_http_methods_text[x].method == method) {
00157          return ast_http_methods_text[x].text;
00158       }
00159    }
00160 
00161    return NULL;
00162 }
00163 
00164 const char *ast_http_ftype2mtype(const char *ftype)
00165 {
00166    int x;
00167 
00168    if (ftype) {
00169       for (x = 0; x < ARRAY_LEN(mimetypes); x++) {
00170          if (!strcasecmp(ftype, mimetypes[x].ext)) {
00171             return mimetypes[x].mtype;
00172          }
00173       }
00174    }
00175    return NULL;
00176 }
00177 
00178 uint32_t ast_http_manid_from_vars(struct ast_variable *headers)
00179 {
00180    uint32_t mngid = 0;
00181    struct ast_variable *v, *cookies;
00182 
00183    cookies = ast_http_get_cookies(headers);
00184    for (v = cookies; v; v = v->next) {
00185       if (!strcasecmp(v->name, "mansession_id")) {
00186          sscanf(v->value, "%30x", &mngid);
00187          break;
00188       }
00189    }
00190    if (cookies) {
00191       ast_variables_destroy(cookies);
00192    }
00193    return mngid;
00194 }
00195 
00196 void ast_http_prefix(char *buf, int len)
00197 {
00198    if (buf) {
00199       ast_copy_string(buf, prefix, len);
00200    }
00201 }
00202 
00203 static int static_callback(struct ast_tcptls_session_instance *ser,
00204    const struct ast_http_uri *urih, const char *uri,
00205    enum ast_http_method method, struct ast_variable *get_vars,
00206    struct ast_variable *headers)
00207 {
00208    char *path;
00209    const char *ftype;
00210    const char *mtype;
00211    char wkspace[80];
00212    struct stat st;
00213    int len;
00214    int fd;
00215    struct ast_str *http_header;
00216    struct timeval tv;
00217    struct ast_tm tm;
00218    char timebuf[80], etag[23];
00219    struct ast_variable *v;
00220    int not_modified = 0;
00221 
00222    if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
00223       ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
00224       return -1;
00225    }
00226 
00227    /* Yuck.  I'm not really sold on this, but if you don't deliver static content it makes your configuration
00228       substantially more challenging, but this seems like a rather irritating feature creep on Asterisk. */
00229    if (!enablestatic || ast_strlen_zero(uri)) {
00230       goto out403;
00231    }
00232 
00233    /* Disallow any funny filenames at all */
00234    if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0])) {
00235       goto out403;
00236    }
00237 
00238    if (strstr(uri, "/..")) {
00239       goto out403;
00240    }
00241 
00242    if ((ftype = strrchr(uri, '.'))) {
00243       ftype++;
00244    }
00245 
00246    if (!(mtype = ast_http_ftype2mtype(ftype))) {
00247       snprintf(wkspace, sizeof(wkspace), "text/%s", S_OR(ftype, "plain"));
00248    }
00249 
00250    /* Cap maximum length */
00251    if ((len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5) > 1024) {
00252       goto out403;
00253    }
00254 
00255    path = alloca(len);
00256    sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
00257    if (stat(path, &st)) {
00258       goto out404;
00259    }
00260 
00261    if (S_ISDIR(st.st_mode)) {
00262       goto out404;
00263    }
00264 
00265    fd = open(path, O_RDONLY);
00266    if (fd < 0) {
00267       goto out403;
00268    }
00269 
00270    if (strstr(path, "/private/") && !astman_is_authed(ast_http_manid_from_vars(headers))) {
00271       goto out403;
00272    }
00273 
00274    /* make "Etag:" http header value */
00275    snprintf(etag, sizeof(etag), "\"%ld\"", (long)st.st_mtime);
00276 
00277    /* make "Last-Modified:" http header value */
00278    tv.tv_sec = st.st_mtime;
00279    tv.tv_usec = 0;
00280    ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&tv, &tm, "GMT"));
00281 
00282    /* check received "If-None-Match" request header and Etag value for file */
00283    for (v = headers; v; v = v->next) {
00284       if (!strcasecmp(v->name, "If-None-Match")) {
00285          if (!strcasecmp(v->value, etag)) {
00286             not_modified = 1;
00287          }
00288          break;
00289       }
00290    }
00291 
00292    if ( (http_header = ast_str_create(255)) == NULL) {
00293       return -1;
00294    }
00295 
00296    ast_str_set(&http_header, 0, "Content-type: %s\r\n"
00297       "ETag: %s\r\n"
00298       "Last-Modified: %s\r\n",
00299       mtype,
00300       etag,
00301       timebuf);
00302 
00303    /* ast_http_send() frees http_header, so we don't need to do it before returning */
00304    if (not_modified) {
00305       ast_http_send(ser, method, 304, "Not Modified", http_header, NULL, 0, 1);
00306    } else {
00307       ast_http_send(ser, method, 200, NULL, http_header, NULL, fd, 1); /* static content flag is set */
00308    }
00309    close(fd);
00310    return 0;
00311 
00312 out404:
00313    ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
00314    return -1;
00315 
00316 out403:
00317    ast_http_error(ser, 403, "Access Denied", "You do not have permission to access the requested URL.");
00318    return -1;
00319 }
00320 
00321 static int httpstatus_callback(struct ast_tcptls_session_instance *ser,
00322    const struct ast_http_uri *urih, const char *uri,
00323    enum ast_http_method method, struct ast_variable *get_vars,
00324    struct ast_variable *headers)
00325 {
00326    struct ast_str *out;
00327    struct ast_variable *v, *cookies = NULL;
00328 
00329    if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
00330       ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
00331       return -1;
00332    }
00333 
00334    if ( (out = ast_str_create(512)) == NULL) {
00335       return -1;
00336    }
00337 
00338    ast_str_append(&out, 0,
00339       "<title>Asterisk HTTP Status</title>\r\n"
00340       "<body bgcolor=\"#ffffff\">\r\n"
00341       "<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
00342       "<h2>&nbsp;&nbsp;Asterisk&trade; HTTP Status</h2></td></tr>\r\n");
00343 
00344    ast_str_append(&out, 0, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
00345    ast_str_append(&out, 0, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
00346              ast_sockaddr_stringify_addr(&http_desc.old_address));
00347    ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
00348              ast_sockaddr_stringify_port(&http_desc.old_address));
00349    if (http_tls_cfg.enabled) {
00350       ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
00351                 ast_sockaddr_stringify_port(&https_desc.old_address));
00352    }
00353    ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
00354    for (v = get_vars; v; v = v->next) {
00355       ast_str_append(&out, 0, "<tr><td><i>Submitted GET Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
00356    }
00357    ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
00358 
00359    cookies = ast_http_get_cookies(headers);
00360    for (v = cookies; v; v = v->next) {
00361       ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
00362    }
00363    ast_variables_destroy(cookies);
00364 
00365    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");
00366    ast_http_send(ser, method, 200, NULL, NULL, out, 0, 0);
00367    return 0;
00368 }
00369 
00370 static struct ast_http_uri statusuri = {
00371    .callback = httpstatus_callback,
00372    .description = "Asterisk HTTP General Status",
00373    .uri = "httpstatus",
00374    .has_subtree = 0,
00375    .data = NULL,
00376    .key = __FILE__,
00377 };
00378 
00379 static struct ast_http_uri staticuri = {
00380    .callback = static_callback,
00381    .description = "Asterisk HTTP Static Delivery",
00382    .uri = "static",
00383    .has_subtree = 1,
00384    .data = NULL,
00385    .key= __FILE__,
00386 };
00387 
00388 
00389 /* send http/1.1 response */
00390 /* free content variable and close socket*/
00391 void ast_http_send(struct ast_tcptls_session_instance *ser,
00392    enum ast_http_method method, int status_code, const char *status_title,
00393    struct ast_str *http_header, struct ast_str *out, const int fd,
00394    unsigned int static_content)
00395 {
00396    struct timeval now = ast_tvnow();
00397    struct ast_tm tm;
00398    char timebuf[80];
00399    int content_length = 0;
00400 
00401    if (!ser || 0 == ser->f) {
00402       return;
00403    }
00404 
00405    ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&now, &tm, "GMT"));
00406 
00407    /* calc content length */
00408    if (out) {
00409       content_length += strlen(ast_str_buffer(out));
00410    }
00411 
00412    if (fd) {
00413       content_length += lseek(fd, 0, SEEK_END);
00414       lseek(fd, 0, SEEK_SET);
00415    }
00416 
00417    /* send http header */
00418    fprintf(ser->f, "HTTP/1.1 %d %s\r\n"
00419       "Server: Asterisk/%s\r\n"
00420       "Date: %s\r\n"
00421       "Connection: close\r\n"
00422       "%s"
00423       "Content-Length: %d\r\n"
00424       "%s"
00425       "\r\n",
00426       status_code, status_title ? status_title : "OK",
00427       ast_get_version(),
00428       timebuf,
00429       static_content ? "" : "Cache-Control: no-cache, no-store\r\n",
00430       content_length,
00431       http_header ? ast_str_buffer(http_header) : ""
00432       );
00433 
00434    /* send content */
00435    if (method != AST_HTTP_HEAD || status_code >= 400) {
00436       if (out) {
00437          fprintf(ser->f, "%s", ast_str_buffer(out));
00438       }
00439 
00440       if (fd) {
00441          char buf[256];
00442          int len;
00443          while ((len = read(fd, buf, sizeof(buf))) > 0) {
00444             if (fwrite(buf, len, 1, ser->f) != 1) {
00445                ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
00446                break;
00447             }
00448          }
00449       }
00450    }
00451 
00452    if (http_header) {
00453       ast_free(http_header);
00454    }
00455    if (out) {
00456       ast_free(out);
00457    }
00458 
00459    fclose(ser->f);
00460    ser->f = 0;
00461    return;
00462 }
00463 
00464 /* Send http "401 Unauthorized" responce and close socket*/
00465 void ast_http_auth(struct ast_tcptls_session_instance *ser, const char *realm,
00466    const unsigned long nonce, const unsigned long opaque, int stale,
00467    const char *text)
00468 {
00469    struct ast_str *http_headers = ast_str_create(128);
00470    struct ast_str *out = ast_str_create(512);
00471 
00472    if (!http_headers || !out) {
00473       ast_free(http_headers);
00474       ast_free(out);
00475       return;
00476    }
00477 
00478    ast_str_set(&http_headers, 0,
00479       "WWW-authenticate: Digest algorithm=MD5, realm=\"%s\", nonce=\"%08lx\", qop=\"auth\", opaque=\"%08lx\"%s\r\n"
00480       "Content-type: text/html\r\n",
00481       realm ? realm : "Asterisk",
00482       nonce,
00483       opaque,
00484       stale ? ", stale=true" : "");
00485 
00486    ast_str_set(&out, 0,
00487       "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
00488       "<html><head>\r\n"
00489       "<title>401 Unauthorized</title>\r\n"
00490       "</head><body>\r\n"
00491       "<h1>401 Unauthorized</h1>\r\n"
00492       "<p>%s</p>\r\n"
00493       "<hr />\r\n"
00494       "<address>Asterisk Server</address>\r\n"
00495       "</body></html>\r\n",
00496       text ? text : "");
00497 
00498    ast_http_send(ser, AST_HTTP_UNKNOWN, 401, "Unauthorized", http_headers, out, 0, 0);
00499    return;
00500 }
00501 
00502 /* send http error response and close socket*/
00503 void ast_http_error(struct ast_tcptls_session_instance *ser, int status_code, const char *status_title, const char *text)
00504 {
00505    struct ast_str *http_headers = ast_str_create(40);
00506    struct ast_str *out = ast_str_create(256);
00507 
00508    if (!http_headers || !out) {
00509       ast_free(http_headers);
00510       ast_free(out);
00511       return;
00512    }
00513 
00514    ast_str_set(&http_headers, 0, "Content-type: text/html\r\n");
00515 
00516    ast_str_set(&out, 0,
00517       "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
00518       "<html><head>\r\n"
00519       "<title>%d %s</title>\r\n"
00520       "</head><body>\r\n"
00521       "<h1>%s</h1>\r\n"
00522       "<p>%s</p>\r\n"
00523       "<hr />\r\n"
00524       "<address>Asterisk Server</address>\r\n"
00525       "</body></html>\r\n",
00526          status_code, status_title, status_title, text);
00527 
00528    ast_http_send(ser, AST_HTTP_UNKNOWN, status_code, status_title, http_headers, out, 0, 0);
00529    return;
00530 }
00531 
00532 /*! \brief
00533  * Link the new uri into the list.
00534  *
00535  * They are sorted by length of
00536  * the string, not alphabetically. Duplicate entries are not replaced,
00537  * but the insertion order (using <= and not just <) makes sure that
00538  * more recent insertions hide older ones.
00539  * On a lookup, we just scan the list and stop at the first matching entry.
00540  */
00541 int ast_http_uri_link(struct ast_http_uri *urih)
00542 {
00543    struct ast_http_uri *uri;
00544    int len = strlen(urih->uri);
00545 
00546    AST_RWLIST_WRLOCK(&uris);
00547 
00548    if ( AST_RWLIST_EMPTY(&uris) || strlen(AST_RWLIST_FIRST(&uris)->uri) <= len ) {
00549       AST_RWLIST_INSERT_HEAD(&uris, urih, entry);
00550       AST_RWLIST_UNLOCK(&uris);
00551       return 0;
00552    }
00553 
00554    AST_RWLIST_TRAVERSE(&uris, uri, entry) {
00555       if (AST_RWLIST_NEXT(uri, entry) &&
00556          strlen(AST_RWLIST_NEXT(uri, entry)->uri) <= len) {
00557          AST_RWLIST_INSERT_AFTER(&uris, uri, urih, entry);
00558          AST_RWLIST_UNLOCK(&uris);
00559 
00560          return 0;
00561       }
00562    }
00563 
00564    AST_RWLIST_INSERT_TAIL(&uris, urih, entry);
00565 
00566    AST_RWLIST_UNLOCK(&uris);
00567 
00568    return 0;
00569 }
00570 
00571 void ast_http_uri_unlink(struct ast_http_uri *urih)
00572 {
00573    AST_RWLIST_WRLOCK(&uris);
00574    AST_RWLIST_REMOVE(&uris, urih, entry);
00575    AST_RWLIST_UNLOCK(&uris);
00576 }
00577 
00578 void ast_http_uri_unlink_all_with_key(const char *key)
00579 {
00580    struct ast_http_uri *urih;
00581    AST_RWLIST_WRLOCK(&uris);
00582    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&uris, urih, entry) {
00583       if (!strcmp(urih->key, key)) {
00584          AST_RWLIST_REMOVE_CURRENT(entry);
00585          if (urih->dmallocd) {
00586             ast_free(urih->data);
00587          }
00588          if (urih->mallocd) {
00589             ast_free(urih);
00590          }
00591       }
00592    }
00593    AST_RWLIST_TRAVERSE_SAFE_END;
00594    AST_RWLIST_UNLOCK(&uris);
00595 }
00596 
00597 /*
00598  * Decode special characters in http uri.
00599  * We have ast_uri_decode to handle %XX sequences, but spaces
00600  * are encoded as a '+' so we need to replace them beforehand.
00601  */
00602 static void http_decode(char *s)
00603 {
00604    char *t;
00605 
00606    for (t = s; *t; t++) {
00607       if (*t == '+') {
00608          *t = ' ';
00609       }
00610    }
00611 
00612    ast_uri_decode(s);
00613 }
00614 
00615 /*
00616  * get post variables from client Request Entity-Body, if content type is
00617  * application/x-www-form-urlencoded
00618  */
00619 struct ast_variable *ast_http_get_post_vars(
00620    struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
00621 {
00622    int content_length = 0;
00623    struct ast_variable *v, *post_vars=NULL, *prev = NULL;
00624    char *buf, *var, *val;
00625 
00626    for (v = headers; v; v = v->next) {
00627       if (!strcasecmp(v->name, "Content-Type")) {
00628          if (strcasecmp(v->value, "application/x-www-form-urlencoded")) {
00629             return NULL;
00630          }
00631          break;
00632       }
00633    }
00634 
00635    for (v = headers; v; v = v->next) {
00636       if (!strcasecmp(v->name, "Content-Length")) {
00637          content_length = atoi(v->value) + 1;
00638          break;
00639       }
00640    }
00641 
00642    if (!content_length) {
00643       return NULL;
00644    }
00645 
00646    if (!(buf = alloca(content_length))) {
00647       return NULL;
00648    }
00649    if (!fgets(buf, content_length, ser->f)) {
00650       return NULL;
00651    }
00652 
00653    while ((val = strsep(&buf, "&"))) {
00654       var = strsep(&val, "=");
00655       if (val) {
00656          http_decode(val);
00657       } else  {
00658          val = "";
00659       }
00660       http_decode(var);
00661       if ((v = ast_variable_new(var, val, ""))) {
00662          if (post_vars) {
00663             prev->next = v;
00664          } else {
00665             post_vars = v;
00666          }
00667          prev = v;
00668       }
00669    }
00670    return post_vars;
00671 }
00672 
00673 static int handle_uri(struct ast_tcptls_session_instance *ser, char *uri,
00674    enum ast_http_method method, struct ast_variable *headers)
00675 {
00676    char *c;
00677    int res = -1;
00678    char *params = uri;
00679    struct ast_http_uri *urih = NULL;
00680    int l;
00681    struct ast_variable *get_vars = NULL, *v, *prev = NULL;
00682    struct http_uri_redirect *redirect;
00683 
00684    ast_debug(2, "HTTP Request URI is %s \n", uri);
00685 
00686    strsep(&params, "?");
00687    /* Extract arguments from the request and store them in variables. */
00688    if (params) {
00689       char *var, *val;
00690 
00691       while ((val = strsep(&params, "&"))) {
00692          var = strsep(&val, "=");
00693          if (val) {
00694             http_decode(val);
00695          } else  {
00696             val = "";
00697          }
00698          http_decode(var);
00699          if ((v = ast_variable_new(var, val, ""))) {
00700             if (get_vars) {
00701                prev->next = v;
00702             } else {
00703                get_vars = v;
00704             }
00705             prev = v;
00706          }
00707       }
00708    }
00709    http_decode(uri);
00710 
00711    AST_RWLIST_RDLOCK(&uri_redirects);
00712    AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
00713       if (!strcasecmp(uri, redirect->target)) {
00714          struct ast_str *http_header = ast_str_create(128);
00715          ast_str_set(&http_header, 0, "Location: %s\r\n", redirect->dest);
00716          ast_http_send(ser, method, 302, "Moved Temporarily", http_header, NULL, 0, 0);
00717 
00718          break;
00719       }
00720    }
00721    AST_RWLIST_UNLOCK(&uri_redirects);
00722    if (redirect) {
00723       goto cleanup;
00724    }
00725 
00726    /* We want requests to start with the (optional) prefix and '/' */
00727    l = strlen(prefix);
00728    if (!strncasecmp(uri, prefix, l) && uri[l] == '/') {
00729       uri += l + 1;
00730       /* scan registered uris to see if we match one. */
00731       AST_RWLIST_RDLOCK(&uris);
00732       AST_RWLIST_TRAVERSE(&uris, urih, entry) {
00733          ast_debug(2, "match request [%s] with handler [%s] len %d\n", uri, urih->uri, l);
00734          l = strlen(urih->uri);
00735          c = uri + l;   /* candidate */
00736          if (strncasecmp(urih->uri, uri, l) /* no match */
00737              || (*c && *c != '/')) { /* substring */
00738             continue;
00739          }
00740          if (*c == '/') {
00741             c++;
00742          }
00743          if (!*c || urih->has_subtree) {
00744             uri = c;
00745             break;
00746          }
00747       }
00748       AST_RWLIST_UNLOCK(&uris);
00749    }
00750    if (urih) {
00751       res = urih->callback(ser, urih, uri, method, get_vars, headers);
00752    } else {
00753       ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
00754    }
00755 
00756 cleanup:
00757    ast_variables_destroy(get_vars);
00758    return res;
00759 }
00760 
00761 #ifdef DO_SSL
00762 #if defined(HAVE_FUNOPEN)
00763 #define HOOK_T int
00764 #define LEN_T int
00765 #else
00766 #define HOOK_T ssize_t
00767 #define LEN_T size_t
00768 #endif
00769 
00770 /*!
00771  * replacement read/write functions for SSL support.
00772  * We use wrappers rather than SSL_read/SSL_write directly so
00773  * we can put in some debugging.
00774  */
00775 /*static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
00776 {
00777    int i = SSL_read(cookie, buf, len-1);
00778 #if 0
00779    if (i >= 0)
00780       buf[i] = '\0';
00781    ast_verbose("ssl read size %d returns %d <%s>\n", (int)len, i, buf);
00782 #endif
00783    return i;
00784 }
00785 
00786 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
00787 {
00788 #if 0
00789    char *s = alloca(len+1);
00790    strncpy(s, buf, len);
00791    s[len] = '\0';
00792    ast_verbose("ssl write size %d <%s>\n", (int)len, s);
00793 #endif
00794    return SSL_write(cookie, buf, len);
00795 }
00796 
00797 static int ssl_close(void *cookie)
00798 {
00799    close(SSL_get_fd(cookie));
00800    SSL_shutdown(cookie);
00801    SSL_free(cookie);
00802    return 0;
00803 }*/
00804 #endif   /* DO_SSL */
00805 
00806 static struct ast_variable *parse_cookies(char *cookies)
00807 {
00808    char *cur;
00809    struct ast_variable *vars = NULL, *var;
00810 
00811    while ((cur = strsep(&cookies, ";"))) {
00812       char *name, *val;
00813 
00814       name = val = cur;
00815       strsep(&val, "=");
00816 
00817       if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
00818          continue;
00819       }
00820 
00821       name = ast_strip(name);
00822       val = ast_strip_quoted(val, "\"", "\"");
00823 
00824       if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
00825          continue;
00826       }
00827 
00828       ast_debug(1, "HTTP Cookie, Name: '%s'  Value: '%s'\n", name, val);
00829 
00830       var = ast_variable_new(name, val, __FILE__);
00831       var->next = vars;
00832       vars = var;
00833    }
00834 
00835    return vars;
00836 }
00837 
00838 /* get cookie from Request headers */
00839 struct ast_variable *ast_http_get_cookies(struct ast_variable *headers)
00840 {
00841    struct ast_variable *v, *cookies=NULL;
00842 
00843    for (v = headers; v; v = v->next) {
00844       if (!strncasecmp(v->name, "Cookie", 6)) {
00845          char *tmp = ast_strdupa(v->value);
00846          if (cookies) {
00847             ast_variables_destroy(cookies);
00848          }
00849 
00850          cookies = parse_cookies(tmp);
00851       }
00852    }
00853    return cookies;
00854 }
00855 
00856 
00857 static void *httpd_helper_thread(void *data)
00858 {
00859    char buf[4096];
00860    char header_line[4096];
00861    struct ast_tcptls_session_instance *ser = data;
00862    struct ast_variable *headers = NULL;
00863    struct ast_variable *tail = headers;
00864    char *uri, *method;
00865    enum ast_http_method http_method = AST_HTTP_UNKNOWN;
00866 
00867    if (ast_atomic_fetchadd_int(&session_count, +1) >= session_limit) {
00868       goto done;
00869    }
00870 
00871    if (!fgets(buf, sizeof(buf), ser->f)) {
00872       goto done;
00873    }
00874 
00875    /* Get method */
00876    method = ast_skip_blanks(buf);
00877    uri = ast_skip_nonblanks(method);
00878    if (*uri) {
00879       *uri++ = '\0';
00880    }
00881 
00882    if (!strcasecmp(method,"GET")) {
00883       http_method = AST_HTTP_GET;
00884    } else if (!strcasecmp(method,"POST")) {
00885       http_method = AST_HTTP_POST;
00886    } else if (!strcasecmp(method,"HEAD")) {
00887       http_method = AST_HTTP_HEAD;
00888    } else if (!strcasecmp(method,"PUT")) {
00889       http_method = AST_HTTP_PUT;
00890    }
00891 
00892    uri = ast_skip_blanks(uri);   /* Skip white space */
00893 
00894    if (*uri) {       /* terminate at the first blank */
00895       char *c = ast_skip_nonblanks(uri);
00896 
00897       if (*c) {
00898          *c = '\0';
00899       }
00900    }
00901 
00902    /* process "Request Headers" lines */
00903    while (fgets(header_line, sizeof(header_line), ser->f)) {
00904       char *name, *value;
00905 
00906       /* Trim trailing characters */
00907       ast_trim_blanks(header_line);
00908       if (ast_strlen_zero(header_line)) {
00909          break;
00910       }
00911 
00912       value = header_line;
00913       name = strsep(&value, ":");
00914       if (!value) {
00915          continue;
00916       }
00917 
00918       value = ast_skip_blanks(value);
00919       if (ast_strlen_zero(value) || ast_strlen_zero(name)) {
00920          continue;
00921       }
00922 
00923       ast_trim_blanks(name);
00924 
00925       if (!headers) {
00926          headers = ast_variable_new(name, value, __FILE__);
00927          tail = headers;
00928       } else {
00929          tail->next = ast_variable_new(name, value, __FILE__);
00930          tail = tail->next;
00931       }
00932    }
00933 
00934    if (!*uri) {
00935       ast_http_error(ser, 400, "Bad Request", "Invalid Request");
00936       goto done;
00937    }
00938 
00939    handle_uri(ser, uri, http_method, headers);
00940 
00941 done:
00942    ast_atomic_fetchadd_int(&session_count, -1);
00943 
00944    /* clean up all the header information */
00945    if (headers) {
00946       ast_variables_destroy(headers);
00947    }
00948 
00949    if (ser->f) {
00950       fclose(ser->f);
00951    }
00952    ao2_ref(ser, -1);
00953    ser = NULL;
00954    return NULL;
00955 }
00956 
00957 /*!
00958  * \brief Add a new URI redirect
00959  * The entries in the redirect list are sorted by length, just like the list
00960  * of URI handlers.
00961  */
00962 static void add_redirect(const char *value)
00963 {
00964    char *target, *dest;
00965    struct http_uri_redirect *redirect, *cur;
00966    unsigned int target_len;
00967    unsigned int total_len;
00968 
00969    dest = ast_strdupa(value);
00970    dest = ast_skip_blanks(dest);
00971    target = strsep(&dest, " ");
00972    target = ast_skip_blanks(target);
00973    target = strsep(&target, " "); /* trim trailing whitespace */
00974 
00975    if (!dest) {
00976       ast_log(LOG_WARNING, "Invalid redirect '%s'\n", value);
00977       return;
00978    }
00979 
00980    target_len = strlen(target) + 1;
00981    total_len = sizeof(*redirect) + target_len + strlen(dest) + 1;
00982 
00983    if (!(redirect = ast_calloc(1, total_len))) {
00984       return;
00985    }
00986    redirect->dest = redirect->target + target_len;
00987    strcpy(redirect->target, target);
00988    strcpy(redirect->dest, dest);
00989 
00990    AST_RWLIST_WRLOCK(&uri_redirects);
00991 
00992    target_len--; /* So we can compare directly with strlen() */
00993    if (AST_RWLIST_EMPTY(&uri_redirects)
00994       || strlen(AST_RWLIST_FIRST(&uri_redirects)->target) <= target_len ) {
00995       AST_RWLIST_INSERT_HEAD(&uri_redirects, redirect, entry);
00996       AST_RWLIST_UNLOCK(&uri_redirects);
00997 
00998       return;
00999    }
01000 
01001    AST_RWLIST_TRAVERSE(&uri_redirects, cur, entry) {
01002       if (AST_RWLIST_NEXT(cur, entry)
01003          && strlen(AST_RWLIST_NEXT(cur, entry)->target) <= target_len ) {
01004          AST_RWLIST_INSERT_AFTER(&uri_redirects, cur, redirect, entry);
01005          AST_RWLIST_UNLOCK(&uri_redirects);
01006          return;
01007       }
01008    }
01009 
01010    AST_RWLIST_INSERT_TAIL(&uri_redirects, redirect, entry);
01011 
01012    AST_RWLIST_UNLOCK(&uri_redirects);
01013 }
01014 
01015 static int __ast_http_load(int reload)
01016 {
01017    struct ast_config *cfg;
01018    struct ast_variable *v;
01019    int enabled=0;
01020    int newenablestatic=0;
01021    struct hostent *hp;
01022    struct ast_hostent ahp;
01023    char newprefix[MAX_PREFIX] = "";
01024    struct http_uri_redirect *redirect;
01025    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
01026    struct sockaddr_in tmp = {0,};
01027    struct sockaddr_in tmp2 = {0,};
01028    int http_tls_was_enabled = 0;
01029 
01030    cfg = ast_config_load2("http.conf", "http", config_flags);
01031    if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
01032       return 0;
01033    }
01034 
01035    http_tls_was_enabled = (reload && http_tls_cfg.enabled);
01036 
01037    tmp.sin_family = AF_INET;
01038    tmp.sin_port = htons(DEFAULT_HTTP_PORT);
01039    ast_sockaddr_from_sin(&http_desc.local_address, &tmp);
01040 
01041    http_tls_cfg.enabled = 0;
01042    if (http_tls_cfg.certfile) {
01043       ast_free(http_tls_cfg.certfile);
01044    }
01045    http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);
01046 
01047    if (http_tls_cfg.pvtfile) {
01048       ast_free(http_tls_cfg.pvtfile);
01049    }
01050    http_tls_cfg.pvtfile = ast_strdup("");
01051 
01052    if (http_tls_cfg.cipher) {
01053       ast_free(http_tls_cfg.cipher);
01054    }
01055    http_tls_cfg.cipher = ast_strdup("");
01056 
01057    AST_RWLIST_WRLOCK(&uri_redirects);
01058    while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
01059       ast_free(redirect);
01060    }
01061    AST_RWLIST_UNLOCK(&uri_redirects);
01062 
01063    ast_sockaddr_setnull(&https_desc.local_address);
01064 
01065    if (cfg) {
01066       v = ast_variable_browse(cfg, "general");
01067       for (; v; v = v->next) {
01068 
01069          /* handle tls conf */
01070          if (!ast_tls_read_conf(&http_tls_cfg, &https_desc, v->name, v->value)) {
01071             continue;
01072          }
01073 
01074          if (!strcasecmp(v->name, "enabled")) {
01075             enabled = ast_true(v->value);
01076          } else if (!strcasecmp(v->name, "enablestatic")) {
01077             newenablestatic = ast_true(v->value);
01078          } else if (!strcasecmp(v->name, "bindport")) {
01079             ast_sockaddr_set_port(&http_desc.local_address,
01080                         atoi(v->value));
01081          } else if (!strcasecmp(v->name, "bindaddr")) {
01082             if ((hp = ast_gethostbyname(v->value, &ahp))) {
01083                ast_sockaddr_to_sin(&http_desc.local_address,
01084                          &tmp);
01085                memcpy(&tmp.sin_addr, hp->h_addr, sizeof(tmp.sin_addr));
01086                ast_sockaddr_from_sin(&http_desc.local_address,
01087                            &tmp);
01088             } else {
01089                ast_log(LOG_WARNING, "Invalid bind address '%s'\n", v->value);
01090             }
01091          } else if (!strcasecmp(v->name, "prefix")) {
01092             if (!ast_strlen_zero(v->value)) {
01093                newprefix[0] = '/';
01094                ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
01095             } else {
01096                newprefix[0] = '\0';
01097             }
01098          } else if (!strcasecmp(v->name, "redirect")) {
01099             add_redirect(v->value);
01100          } else if (!strcasecmp(v->name, "sessionlimit")) {
01101             if (ast_parse_arg(v->value, PARSE_INT32|PARSE_DEFAULT|PARSE_IN_RANGE,
01102                      &session_limit, DEFAULT_SESSION_LIMIT, 1, INT_MAX)) {
01103                ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
01104                      v->name, v->value, v->lineno);
01105             }
01106          } else {
01107             ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
01108          }
01109       }
01110 
01111       ast_config_destroy(cfg);
01112    }
01113    /* if the https address has not been set, default is the same as non secure http */
01114    ast_sockaddr_to_sin(&http_desc.local_address, &tmp);
01115    ast_sockaddr_to_sin(&https_desc.local_address, &tmp2);
01116    if (!tmp2.sin_addr.s_addr) {
01117       tmp2.sin_addr = tmp.sin_addr;
01118    }
01119    if (!tmp2.sin_port) {
01120       tmp2.sin_port = htons(DEFAULT_HTTPS_PORT);
01121    }
01122    ast_sockaddr_from_sin(&https_desc.local_address, &tmp2);
01123    if (!enabled) {
01124       ast_sockaddr_setnull(&http_desc.local_address);
01125       ast_sockaddr_setnull(&https_desc.local_address);
01126    }
01127    if (strcmp(prefix, newprefix)) {
01128       ast_copy_string(prefix, newprefix, sizeof(prefix));
01129    }
01130    enablestatic = newenablestatic;
01131    ast_tcptls_server_start(&http_desc);
01132    /* If https was enabled previously but now is not, then stop the service */
01133    if (http_tls_was_enabled && !http_tls_cfg.enabled) {
01134       ast_tcptls_server_stop(&https_desc);
01135    } else if (ast_ssl_setup(https_desc.tls_cfg)) {
01136       ast_tcptls_server_start(&https_desc);
01137    }
01138 
01139    return 0;
01140 }
01141 
01142 static char *handle_show_http(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01143 {
01144    struct ast_http_uri *urih;
01145    struct http_uri_redirect *redirect;
01146    struct sockaddr_in tmp;
01147 
01148    switch (cmd) {
01149    case CLI_INIT:
01150       e->command = "http show status";
01151       e->usage =
01152          "Usage: http show status\n"
01153          "       Lists status of internal HTTP engine\n";
01154       return NULL;
01155    case CLI_GENERATE:
01156       return NULL;
01157    }
01158 
01159    if (a->argc != 3) {
01160       return CLI_SHOWUSAGE;
01161    }
01162    ast_cli(a->fd, "HTTP Server Status:\n");
01163    ast_cli(a->fd, "Prefix: %s\n", prefix);
01164    ast_sockaddr_to_sin(&http_desc.old_address, &tmp);
01165    if (!tmp.sin_family) {
01166       ast_cli(a->fd, "Server Disabled\n\n");
01167    } else {
01168       ast_cli(a->fd, "Server Enabled and Bound to %s:%d\n\n",
01169          ast_inet_ntoa(tmp.sin_addr), ntohs(tmp.sin_port));
01170       if (http_tls_cfg.enabled) {
01171          ast_sockaddr_to_sin(&https_desc.old_address, &tmp);
01172          ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s:%d\n\n",
01173             ast_inet_ntoa(tmp.sin_addr),
01174             ntohs(tmp.sin_port));
01175       }
01176    }
01177 
01178    ast_cli(a->fd, "Enabled URI's:\n");
01179    AST_RWLIST_RDLOCK(&uris);
01180    if (AST_RWLIST_EMPTY(&uris)) {
01181       ast_cli(a->fd, "None.\n");
01182    } else {
01183       AST_RWLIST_TRAVERSE(&uris, urih, entry)
01184          ast_cli(a->fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
01185    }
01186    AST_RWLIST_UNLOCK(&uris);
01187 
01188    ast_cli(a->fd, "\nEnabled Redirects:\n");
01189    AST_RWLIST_RDLOCK(&uri_redirects);
01190    AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry)
01191       ast_cli(a->fd, "  %s => %s\n", redirect->target, redirect->dest);
01192    if (AST_RWLIST_EMPTY(&uri_redirects)) {
01193       ast_cli(a->fd, "  None.\n");
01194    }
01195    AST_RWLIST_UNLOCK(&uri_redirects);
01196 
01197    return CLI_SUCCESS;
01198 }
01199 
01200 int ast_http_reload(void)
01201 {
01202    return __ast_http_load(1);
01203 }
01204 
01205 static struct ast_cli_entry cli_http[] = {
01206    AST_CLI_DEFINE(handle_show_http, "Display HTTP server status"),
01207 };
01208 
01209 int ast_http_init(void)
01210 {
01211    ast_http_uri_link(&statusuri);
01212    ast_http_uri_link(&staticuri);
01213    ast_cli_register_multiple(cli_http, ARRAY_LEN(cli_http));
01214 
01215    return __ast_http_load(0);
01216 }

Generated on Mon Oct 8 12:39:03 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7