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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
* \brief http server
*
* This program implements a tiny http server supporting the "get" method
* only and was inspired by micro-httpd by Jef Poskanzer
*/
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include "asterisk/cli.h"
#include "asterisk/http.h"
#include "asterisk/utils.h"
#include "asterisk/strings.h"
#define MAX_PREFIX 80
#define DEFAULT_PREFIX "asterisk"
struct ast_http_server_instance {
FILE *f;
int fd;
struct sockaddr_in requestor;
ast_http_callback callback;
};
static struct ast_http_uri *uris;
static int httpfd = -1;
static pthread_t master = AST_PTHREADT_NULL;
static char prefix[MAX_PREFIX];
static int prefix_len = 0;
static struct sockaddr_in oldsin;
static char *httpstatus_callback(struct sockaddr_in *req, const char *uri, struct ast_variable *vars, int *status, char **title, int *contentlength)
{
char result[4096];
size_t reslen = sizeof(result);
char *c=result;
struct ast_variable *v;
char iabuf[INET_ADDRSTRLEN];
ast_build_string(&c, &reslen,
"\r\n"
"<title>Asterisk HTTP Status</title>\r\n"
"<body bgcolor=\"#ffffff\">\r\n"
"<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
"<h2> Asterisk™ HTTP Status</h2></td></tr>\r\n");
ast_build_string(&c, &reslen, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
ast_build_string(&c, &reslen, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
ast_inet_ntoa(iabuf, sizeof(iabuf), oldsin.sin_addr));
ast_build_string(&c, &reslen, "<tr><td><i>Bind Port</i></td><td><b>%d</b></td></tr>\r\n",
ntohs(oldsin.sin_port));
ast_build_string(&c, &reslen, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
v = vars;
while(v) {
ast_build_string(&c, &reslen, "<tr><td><i>Submitted Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
v = v->next;
}
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");
return strdup(result);
}
static struct ast_http_uri statusuri = {
.callback = httpstatus_callback,
.description = "Asterisk HTTP General Status",
.uri = "httpstatus",
.has_subtree = 0,
};
char *ast_http_error(int status, const char *title, const char *extra_header, const char *text)
{
char *c = NULL;
asprintf(&c,
"Content-type: text/html\r\n"
"%s"
"\r\n"
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
"<html><head>\r\n"
"<title>%d %s</title>\r\n"
"</head><body>\r\n"
"<h1>%s</h1>\r\n"
"<p>%s</p>\r\n"
"<hr />\r\n"
"<address>Asterisk Server</address>\r\n"
"</body></html>\r\n",
(extra_header ? extra_header : ""), status, title, title, text);
return c;
}
int ast_http_uri_link(struct ast_http_uri *urih)
{
struct ast_http_uri *prev=uris;
if (!uris || strlen(uris->uri) <= strlen(urih->uri)) {
urih->next = uris;
uris = urih;
} else {
while (prev->next && (strlen(prev->next->uri) > strlen(urih->uri)))
prev = prev->next;
/* Insert it here */
urih->next = prev->next;
prev->next = urih;
}
return 0;
}
void ast_http_uri_unlink(struct ast_http_uri *urih)
{
struct ast_http_uri *prev = uris;
if (!uris)
return;
if (uris == urih) {
uris = uris->next;
}
while(prev->next) {
if (prev->next == urih) {
prev->next = urih->next;
break;
}
prev = prev->next;
}
}
static char *handle_uri(struct sockaddr_in *sin, char *uri, int *status, char **title, int *contentlength)
{
char *c;
char *turi;
char *params;
char *var;
char *val;
struct ast_http_uri *urih=NULL;
int len;
struct ast_variable *vars=NULL, *v, *prev = NULL;
if (*uri == '/')
uri++;
params = strchr(uri, '?');
if (params) {
*params = '\0';
params++;
while ((var = strsep(¶ms, "&"))) {
val = strchr(var, '=');
if (val) {
*val = '\0';
val++;
} else
val = "";
ast_uri_decode(val);
ast_uri_decode(var);
if ((v = ast_variable_new(var, val))) {
if (vars)
prev->next = v;
else
vars = v;
prev = v;
}
}
}
ast_uri_decode(uri);
if (!strncasecmp(uri, prefix, prefix_len)) {
uri += prefix_len;
if (!*uri || (*uri == '/')) {
if (*uri == '/')
uri++;
urih = uris;
while(urih) {
len = strlen(urih->uri);
if (!strncasecmp(urih->uri, uri, len)) {
if (!uri[len] || uri[len] == '/') {
turi = uri + len;
if (*turi == '/')
turi++;
if (!*turi || urih->has_subtree) {
uri = turi;
break;
}
}
}
urih = urih->next;
}
}
}
if (urih) {
c = urih->callback(sin, uri, vars, status, title, contentlength);
ast_variables_destroy(vars);
} else {
c = ast_http_error(404, "Not Found", NULL, "The requested URL was not found on this serer.");
*status = 404;
*title = strdup("Not Found");
}
return c;
}
static void *ast_httpd_helper_thread(void *data)
{
char buf[4096];
char timebuf[256];
struct ast_http_server_instance *ser = data;
char *uri, *c, *title=NULL;
int status = 200, contentlength = 0;
time_t t;
if (fgets(buf, sizeof(buf), ser->f)) {
/* Skip method */
uri = buf;
while(*uri && (*uri > 32)) uri++;
if (*uri) {
*uri = '\0';
uri++;
}
/* Skip white space */
while (*uri && (*uri < 33)) uri++;
if (*uri) {
c = uri;
while (*c && (*c > 32)) c++;
if (*c) {
*c = '\0';
}
}
if (*uri) {
if (!strcasecmp(buf, "get"))
c = handle_uri(&ser->requestor, uri, &status, &title, &contentlength);
else
c = ast_http_error(501, "Not Implemented", NULL, "Attempt to use unimplemented / unsupported method");\
} else
c = ast_http_error(400, "Bad Request", NULL, "Invalid Request");
if (!c)
c = ast_http_error(500, "Internal Error", NULL, "Internal Server Error");
if (c) {
time(&t);
strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", gmtime(&t));
ast_cli(ser->fd, "HTTP/1.1 GET %d %s\r\n", status, title ? title : "OK");
ast_cli(ser->fd, "Server: Asterisk\r\n");
ast_cli(ser->fd, "Date: %s\r\n", timebuf);
if (contentlength)
ast_cli(ser->fd, "Content-length: %d\r\n", contentlength);
ast_cli(ser->fd, "Connection: close\r\n");
ast_cli(ser->fd, "%s", c);
free(c);
}
if (title)
free(title);
}
fclose(ser->f);
free(ser);
return NULL;
}
static void *http_root(void *data)
{
int fd;
struct sockaddr_in sin;
int sinlen;
struct ast_http_server_instance *ser;
pthread_t launched;
for (;;) {
ast_wait_for_input(httpfd, -1);
sinlen = sizeof(sin);
fd = accept(httpfd, (struct sockaddr *)&sin, &sinlen);
if (fd < 0) {
if ((errno != EAGAIN) && (errno != EINTR))
ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
continue;
}
if (!(ser = ast_calloc(1, sizeof(*ser)))) {
close(fd);
continue;
}
ser->fd = fd;
if ((ser->f = fdopen(ser->fd, "w+"))) {
if (ast_pthread_create(&launched, NULL, ast_httpd_helper_thread, ser)) {
ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
fclose(ser->f);
free(ser);
}
} else {
ast_log(LOG_WARNING, "fdopen failed!\n");
close(ser->fd);
free(ser);
}
}
return NULL;
}
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;
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, "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"))
ast_copy_string(newprefix, v->value, sizeof(newprefix));
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);
}
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 != 2)
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: show http\n"
" Shows status of internal HTTP engine\n";
static struct ast_cli_entry http_cli[] = {
{ { "show", "http", NULL }, handle_show_http,
"Display HTTP status", show_http_help },
};
int ast_http_init(void)
{
ast_http_uri_link(&statusuri);
ast_cli_register_multiple(http_cli, sizeof(http_cli) / sizeof(http_cli[0]));
return __ast_http_load(0);
}
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