674 lines
17 KiB
C
674 lines
17 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \brief http server for AMI access
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*
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* \author Mark Spencer <markster@digium.com>
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* This program implements a tiny http server supporting the "get" method
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* only and was inspired by micro-httpd by Jef Poskanzer
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*
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* \ref AstHTTP - AMI over the http protocol
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/signal.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/cli.h"
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#include "asterisk/http.h"
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#include "asterisk/utils.h"
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#include "asterisk/strings.h"
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#include "asterisk/options.h"
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#include "asterisk/config.h"
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#define MAX_PREFIX 80
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#define DEFAULT_PREFIX "/asterisk"
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struct ast_http_server_instance {
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FILE *f;
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int fd;
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struct sockaddr_in requestor;
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ast_http_callback callback;
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};
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static struct ast_http_uri *uris;
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static int httpfd = -1;
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static pthread_t master = AST_PTHREADT_NULL;
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static char prefix[MAX_PREFIX];
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static int prefix_len = 0;
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static struct sockaddr_in oldsin;
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static int enablestatic=0;
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/*! \brief Limit the kinds of files we're willing to serve up */
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static struct {
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char *ext;
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char *mtype;
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} mimetypes[] = {
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{ "png", "image/png" },
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{ "jpg", "image/jpeg" },
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{ "js", "application/x-javascript" },
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{ "wav", "audio/x-wav" },
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{ "mp3", "audio/mpeg" },
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};
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static char *ftype2mtype(const char *ftype, char *wkspace, int wkspacelen)
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{
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int x;
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if (ftype) {
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for (x=0;x<sizeof(mimetypes) / sizeof(mimetypes[0]); x++) {
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if (!strcasecmp(ftype, mimetypes[x].ext))
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return mimetypes[x].mtype;
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}
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}
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snprintf(wkspace, wkspacelen, "text/%s", ftype ? ftype : "plain");
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return wkspace;
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}
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static char *static_callback(struct sockaddr_in *req, const char *uri, struct ast_variable *vars, int *status, char **title, int *contentlength)
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{
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char result[4096];
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char *c=result;
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char *path;
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char *ftype, *mtype;
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char wkspace[80];
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struct stat st;
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int len;
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int fd;
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void *blob;
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/* Yuck. I'm not really sold on this, but if you don't deliver static content it makes your configuration
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substantially more challenging, but this seems like a rather irritating feature creep on Asterisk. */
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if (!enablestatic || ast_strlen_zero(uri))
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goto out403;
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/* Disallow any funny filenames at all */
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if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0]))
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goto out403;
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if (strstr(uri, "/.."))
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goto out403;
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if ((ftype = strrchr(uri, '.')))
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ftype++;
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mtype=ftype2mtype(ftype, wkspace, sizeof(wkspace));
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/* Cap maximum length */
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len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5;
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if (len > 1024)
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goto out403;
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path = alloca(len);
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sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
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if (stat(path, &st))
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goto out404;
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if (S_ISDIR(st.st_mode))
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goto out404;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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goto out403;
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len = st.st_size + strlen(mtype) + 40;
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blob = malloc(len);
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if (blob) {
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c = blob;
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sprintf(c, "Content-type: %s\r\n\r\n", mtype);
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c += strlen(c);
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*contentlength = read(fd, c, st.st_size);
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if (*contentlength < 0) {
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close(fd);
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free(blob);
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goto out403;
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}
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}
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return blob;
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out404:
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*status = 404;
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*title = strdup("Not Found");
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return ast_http_error(404, "Not Found", NULL, "Nothing to see here. Move along.");
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out403:
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*status = 403;
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*title = strdup("Access Denied");
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return ast_http_error(403, "Access Denied", NULL, "Sorry, I cannot let you do that, Dave.");
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}
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static char *httpstatus_callback(struct sockaddr_in *req, const char *uri, struct ast_variable *vars, int *status, char **title, int *contentlength)
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{
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char result[4096];
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size_t reslen = sizeof(result);
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char *c=result;
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struct ast_variable *v;
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char iabuf[INET_ADDRSTRLEN];
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ast_build_string(&c, &reslen,
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"\r\n"
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"<title>Asterisk HTTP Status</title>\r\n"
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"<body bgcolor=\"#ffffff\">\r\n"
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"<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
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"<h2> Asterisk™ HTTP Status</h2></td></tr>\r\n");
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ast_build_string(&c, &reslen, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
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ast_build_string(&c, &reslen, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
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ast_inet_ntoa(iabuf, sizeof(iabuf), oldsin.sin_addr));
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ast_build_string(&c, &reslen, "<tr><td><i>Bind Port</i></td><td><b>%d</b></td></tr>\r\n",
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ntohs(oldsin.sin_port));
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ast_build_string(&c, &reslen, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
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v = vars;
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while(v) {
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if (strncasecmp(v->name, "cookie_", 7))
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ast_build_string(&c, &reslen, "<tr><td><i>Submitted Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
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v = v->next;
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}
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ast_build_string(&c, &reslen, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
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v = vars;
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while(v) {
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if (!strncasecmp(v->name, "cookie_", 7))
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ast_build_string(&c, &reslen, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
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v = v->next;
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}
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ast_build_string(&c, &reslen, "</table><center><font size=\"-1\"><i>Asterisk and Digium are registered trademarks of Digium, Inc.</i></font></center></body>\r\n");
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return strdup(result);
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}
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static struct ast_http_uri statusuri = {
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.callback = httpstatus_callback,
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.description = "Asterisk HTTP General Status",
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.uri = "httpstatus",
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.has_subtree = 0,
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};
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static struct ast_http_uri staticuri = {
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.callback = static_callback,
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.description = "Asterisk HTTP Static Delivery",
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.uri = "static",
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.has_subtree = 1,
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};
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char *ast_http_error(int status, const char *title, const char *extra_header, const char *text)
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{
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char *c = NULL;
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asprintf(&c,
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"Content-type: text/html\r\n"
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"%s"
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"\r\n"
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"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
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"<html><head>\r\n"
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"<title>%d %s</title>\r\n"
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"</head><body>\r\n"
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"<h1>%s</h1>\r\n"
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"<p>%s</p>\r\n"
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"<hr />\r\n"
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"<address>Asterisk Server</address>\r\n"
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"</body></html>\r\n",
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(extra_header ? extra_header : ""), status, title, title, text);
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return c;
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}
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int ast_http_uri_link(struct ast_http_uri *urih)
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{
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struct ast_http_uri *prev=uris;
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if (!uris || strlen(uris->uri) <= strlen(urih->uri)) {
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urih->next = uris;
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uris = urih;
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} else {
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while (prev->next && (strlen(prev->next->uri) > strlen(urih->uri)))
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prev = prev->next;
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/* Insert it here */
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urih->next = prev->next;
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prev->next = urih;
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}
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return 0;
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}
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void ast_http_uri_unlink(struct ast_http_uri *urih)
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{
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struct ast_http_uri *prev = uris;
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if (!uris)
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return;
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if (uris == urih) {
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uris = uris->next;
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}
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while(prev->next) {
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if (prev->next == urih) {
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prev->next = urih->next;
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break;
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}
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prev = prev->next;
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}
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}
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static char *handle_uri(struct sockaddr_in *sin, char *uri, int *status, char **title, int *contentlength, struct ast_variable **cookies)
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{
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char *c;
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char *turi;
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char *params;
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char *var;
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char *val;
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struct ast_http_uri *urih=NULL;
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int len;
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struct ast_variable *vars=NULL, *v, *prev = NULL;
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params = strchr(uri, '?');
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if (params) {
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*params = '\0';
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params++;
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while ((var = strsep(¶ms, "&"))) {
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val = strchr(var, '=');
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if (val) {
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*val = '\0';
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val++;
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ast_uri_decode(val);
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} else
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val = "";
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ast_uri_decode(var);
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if ((v = ast_variable_new(var, val))) {
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if (vars)
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prev->next = v;
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else
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vars = v;
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prev = v;
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}
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}
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}
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if (prev)
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prev->next = *cookies;
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else
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vars = *cookies;
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*cookies = NULL;
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ast_uri_decode(uri);
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if (!strncasecmp(uri, prefix, prefix_len)) {
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uri += prefix_len;
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if (!*uri || (*uri == '/')) {
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if (*uri == '/')
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uri++;
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urih = uris;
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while(urih) {
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len = strlen(urih->uri);
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if (!strncasecmp(urih->uri, uri, len)) {
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if (!uri[len] || uri[len] == '/') {
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turi = uri + len;
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if (*turi == '/')
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turi++;
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if (!*turi || urih->has_subtree) {
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uri = turi;
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break;
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}
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}
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}
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urih = urih->next;
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}
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}
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}
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if (urih) {
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c = urih->callback(sin, uri, vars, status, title, contentlength);
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ast_variables_destroy(vars);
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} else if (ast_strlen_zero(uri) && ast_strlen_zero(prefix)) {
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/* Special case: If no prefix, and no URI, send to /static/index.html */
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c = ast_http_error(302, "Moved Temporarily", "Location: /static/index.html\r\n", "This is not the page you are looking for...");
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*status = 302;
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*title = strdup("Moved Temporarily");
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} else {
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c = ast_http_error(404, "Not Found", NULL, "The requested URL was not found on this serer.");
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*status = 404;
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*title = strdup("Not Found");
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}
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return c;
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}
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static void *ast_httpd_helper_thread(void *data)
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{
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char buf[4096];
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char cookie[4096];
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char timebuf[256];
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struct ast_http_server_instance *ser = data;
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struct ast_variable *var, *prev=NULL, *vars=NULL;
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char *uri, *c, *title=NULL;
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char *vname, *vval;
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int status = 200, contentlength = 0;
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time_t t;
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if (fgets(buf, sizeof(buf), ser->f)) {
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/* Skip method */
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uri = buf;
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while(*uri && (*uri > 32))
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uri++;
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if (*uri) {
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*uri = '\0';
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uri++;
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}
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/* Skip white space */
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while (*uri && (*uri < 33))
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uri++;
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if (*uri) {
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c = uri;
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while (*c && (*c > 32))
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c++;
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if (*c) {
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*c = '\0';
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}
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}
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while (fgets(cookie, sizeof(cookie), ser->f)) {
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/* Trim trailing characters */
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while(!ast_strlen_zero(cookie) && (cookie[strlen(cookie) - 1] < 33)) {
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cookie[strlen(cookie) - 1] = '\0';
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}
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if (ast_strlen_zero(cookie))
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break;
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if (!strncasecmp(cookie, "Cookie: ", 8)) {
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vname = cookie + 8;
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vval = strchr(vname, '=');
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if (vval) {
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/* Ditch the = and the quotes */
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*vval = '\0';
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vval++;
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if (*vval)
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vval++;
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if (strlen(vval))
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vval[strlen(vval) - 1] = '\0';
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var = ast_variable_new(vname, vval);
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if (var) {
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if (prev)
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prev->next = var;
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else
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vars = var;
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prev = var;
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}
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}
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}
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}
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if (*uri) {
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if (!strcasecmp(buf, "get"))
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c = handle_uri(&ser->requestor, uri, &status, &title, &contentlength, &vars);
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else
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c = ast_http_error(501, "Not Implemented", NULL, "Attempt to use unimplemented / unsupported method");\
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} else
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c = ast_http_error(400, "Bad Request", NULL, "Invalid Request");
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/* If they aren't mopped up already, clean up the cookies */
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if (vars)
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ast_variables_destroy(vars);
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if (!c)
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c = ast_http_error(500, "Internal Error", NULL, "Internal Server Error");
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if (c) {
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time(&t);
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strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", gmtime(&t));
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ast_cli(ser->fd, "HTTP/1.1 %d %s\r\n", status, title ? title : "OK");
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ast_cli(ser->fd, "Server: Asterisk\r\n");
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ast_cli(ser->fd, "Date: %s\r\n", timebuf);
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ast_cli(ser->fd, "Connection: close\r\n");
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if (contentlength) {
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char *tmp;
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tmp = strstr(c, "\r\n\r\n");
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if (tmp) {
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ast_cli(ser->fd, "Content-length: %d\r\n", contentlength);
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write(ser->fd, c, (tmp + 4 - c));
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write(ser->fd, tmp + 4, contentlength);
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}
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} else
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ast_cli(ser->fd, "%s", c);
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free(c);
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}
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if (title)
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free(title);
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}
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fclose(ser->f);
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free(ser);
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return NULL;
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}
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static void *http_root(void *data)
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{
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int fd;
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struct sockaddr_in sin;
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int sinlen;
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struct ast_http_server_instance *ser;
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pthread_t launched;
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pthread_attr_t attr;
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for (;;) {
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ast_wait_for_input(httpfd, -1);
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sinlen = sizeof(sin);
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fd = accept(httpfd, (struct sockaddr *)&sin, &sinlen);
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if (fd < 0) {
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if ((errno != EAGAIN) && (errno != EINTR))
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ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
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continue;
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}
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ser = ast_calloc(1, sizeof(*ser));
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if (ser) {
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ser->fd = fd;
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memcpy(&ser->requestor, &sin, sizeof(ser->requestor));
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if ((ser->f = fdopen(ser->fd, "w+"))) {
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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if (ast_pthread_create(&launched, &attr, ast_httpd_helper_thread, ser)) {
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ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
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fclose(ser->f);
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free(ser);
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}
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} else {
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ast_log(LOG_WARNING, "fdopen failed!\n");
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close(ser->fd);
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free(ser);
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}
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}
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}
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return NULL;
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}
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char *ast_http_setcookie(const char *var, const char *val, int expires, char *buf, size_t buflen)
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|
{
|
|
char *c;
|
|
c = buf;
|
|
ast_build_string(&c, &buflen, "Set-Cookie: %s=\"%s\"; Version=\"1\"", var, val);
|
|
if (expires)
|
|
ast_build_string(&c, &buflen, "; Max-Age=%d", expires);
|
|
ast_build_string(&c, &buflen, "\r\n");
|
|
return buf;
|
|
}
|
|
|
|
|
|
static void http_server_start(struct sockaddr_in *sin)
|
|
{
|
|
char iabuf[INET_ADDRSTRLEN];
|
|
int flags;
|
|
int x = 1;
|
|
|
|
/* Do nothing if nothing has changed */
|
|
if (!memcmp(&oldsin, sin, sizeof(oldsin))) {
|
|
ast_log(LOG_DEBUG, "Nothing changed in http\n");
|
|
return;
|
|
}
|
|
|
|
memcpy(&oldsin, sin, sizeof(oldsin));
|
|
|
|
/* Shutdown a running server if there is one */
|
|
if (master != AST_PTHREADT_NULL) {
|
|
pthread_cancel(master);
|
|
pthread_kill(master, SIGURG);
|
|
pthread_join(master, NULL);
|
|
}
|
|
|
|
if (httpfd != -1)
|
|
close(httpfd);
|
|
|
|
/* If there's no new server, stop here */
|
|
if (!sin->sin_family)
|
|
return;
|
|
|
|
|
|
httpfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (httpfd < 0) {
|
|
ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
setsockopt(httpfd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
|
|
if (bind(httpfd, (struct sockaddr *)sin, sizeof(*sin))) {
|
|
ast_log(LOG_NOTICE, "Unable to bind http server to %s:%d: %s\n",
|
|
ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr), ntohs(sin->sin_port),
|
|
strerror(errno));
|
|
close(httpfd);
|
|
httpfd = -1;
|
|
return;
|
|
}
|
|
if (listen(httpfd, 10)) {
|
|
ast_log(LOG_NOTICE, "Unable to listen!\n");
|
|
close(httpfd);
|
|
httpfd = -1;
|
|
return;
|
|
}
|
|
flags = fcntl(httpfd, F_GETFL);
|
|
fcntl(httpfd, F_SETFL, flags | O_NONBLOCK);
|
|
if (ast_pthread_create(&master, NULL, http_root, NULL)) {
|
|
ast_log(LOG_NOTICE, "Unable to launch http server on %s:%d: %s\n",
|
|
ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr), ntohs(sin->sin_port),
|
|
strerror(errno));
|
|
close(httpfd);
|
|
httpfd = -1;
|
|
}
|
|
}
|
|
|
|
static int __ast_http_load(int reload)
|
|
{
|
|
struct ast_config *cfg;
|
|
struct ast_variable *v;
|
|
int enabled=0;
|
|
int newenablestatic=0;
|
|
struct sockaddr_in sin;
|
|
struct hostent *hp;
|
|
struct ast_hostent ahp;
|
|
char newprefix[MAX_PREFIX];
|
|
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_port = 8088;
|
|
strcpy(newprefix, DEFAULT_PREFIX);
|
|
cfg = ast_config_load("http.conf");
|
|
if (cfg) {
|
|
v = ast_variable_browse(cfg, "general");
|
|
while(v) {
|
|
if (!strcasecmp(v->name, "enabled"))
|
|
enabled = ast_true(v->value);
|
|
else if (!strcasecmp(v->name, "enablestatic"))
|
|
newenablestatic = ast_true(v->value);
|
|
else if (!strcasecmp(v->name, "bindport"))
|
|
sin.sin_port = ntohs(atoi(v->value));
|
|
else if (!strcasecmp(v->name, "bindaddr")) {
|
|
if ((hp = ast_gethostbyname(v->value, &ahp))) {
|
|
memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
|
|
} else {
|
|
ast_log(LOG_WARNING, "Invalid bind address '%s'\n", v->value);
|
|
}
|
|
} else if (!strcasecmp(v->name, "prefix")) {
|
|
if (!ast_strlen_zero(v->value)) {
|
|
newprefix[0] = '/';
|
|
ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
|
|
} else {
|
|
newprefix[0] = '\0';
|
|
}
|
|
|
|
}
|
|
v = v->next;
|
|
}
|
|
ast_config_destroy(cfg);
|
|
}
|
|
if (enabled)
|
|
sin.sin_family = AF_INET;
|
|
if (strcmp(prefix, newprefix)) {
|
|
ast_copy_string(prefix, newprefix, sizeof(prefix));
|
|
prefix_len = strlen(prefix);
|
|
}
|
|
enablestatic = newenablestatic;
|
|
http_server_start(&sin);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_show_http(int fd, int argc, char *argv[])
|
|
{
|
|
char iabuf[INET_ADDRSTRLEN];
|
|
struct ast_http_uri *urih;
|
|
if (argc != 3)
|
|
return RESULT_SHOWUSAGE;
|
|
ast_cli(fd, "HTTP Server Status:\n");
|
|
ast_cli(fd, "Prefix: %s\n", prefix);
|
|
if (oldsin.sin_family)
|
|
ast_cli(fd, "Server Enabled and Bound to %s:%d\n\n",
|
|
ast_inet_ntoa(iabuf, sizeof(iabuf), oldsin.sin_addr),
|
|
ntohs(oldsin.sin_port));
|
|
else
|
|
ast_cli(fd, "Server Disabled\n\n");
|
|
ast_cli(fd, "Enabled URI's:\n");
|
|
urih = uris;
|
|
while(urih){
|
|
ast_cli(fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
|
|
urih = urih->next;
|
|
}
|
|
if (!uris)
|
|
ast_cli(fd, "None.\n");
|
|
return RESULT_SUCCESS;
|
|
}
|
|
|
|
int ast_http_reload(void)
|
|
{
|
|
return __ast_http_load(1);
|
|
}
|
|
|
|
static char show_http_help[] =
|
|
"Usage: http show status\n"
|
|
" Shows status of internal HTTP engine\n";
|
|
|
|
static struct ast_cli_entry http_cli[] = {
|
|
{ { "http", "show", "status", NULL }, handle_show_http,
|
|
"Display HTTP server status", show_http_help },
|
|
};
|
|
|
|
int ast_http_init(void)
|
|
{
|
|
ast_http_uri_link(&statusuri);
|
|
ast_http_uri_link(&staticuri);
|
|
ast_cli_register_multiple(http_cli, sizeof(http_cli) / sizeof(http_cli[0]));
|
|
return __ast_http_load(0);
|
|
}
|