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/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define _GNU_SOURCE
#include <libubox/blobmsg.h>
#include "uhttpd.h"
static LIST_HEAD(interpreters);
void uh_interpreter_add(const char *ext, const char *path)
{
struct interpreter *in;
char *new_ext, *new_path;
in = calloc_a(sizeof(*in),
&new_ext, strlen(ext) + 1,
&new_path, strlen(path) + 1);
in->ext = strcpy(new_ext, ext);
in->path = strcpy(new_path, path);
list_add_tail(&in->list, &interpreters);
}
static void cgi_main(struct client *cl, struct path_info *pi, char *url)
{
const struct interpreter *ip = pi->ip;
struct env_var *var;
clearenv();
setenv("PATH", conf.cgi_path, 1);
for (var = uh_get_process_vars(cl, pi); var->name; var++) {
if (!var->value)
continue;
setenv(var->name, var->value, 1);
}
if (!chdir(pi->root)) {
if (ip)
execl(ip->path, ip->path, pi->phys, NULL);
else
execl(pi->phys, pi->phys, NULL);
}
printf("Status: 500 Internal Server Error\r\n\r\n"
"Unable to launch the requested CGI program:\n"
" %s: %s\n", ip ? ip->path : pi->phys, strerror(errno));
}
static void cgi_handle_request(struct client *cl, char *url, struct path_info *pi)
{
unsigned int mode = S_IFREG | S_IXOTH;
char *escaped_url;
if (!pi->ip && !((pi->stat.st_mode & mode) == mode)) {
escaped_url = uh_htmlescape(url);
uh_client_error(cl, 403, "Forbidden",
"You don't have permission to access %s on this server.",
escaped_url ? escaped_url : "the url");
if (escaped_url)
free(escaped_url);
return;
}
if (!uh_create_process(cl, pi, url, cgi_main)) {
uh_client_error(cl, 500, "Internal Server Error",
"Failed to create CGI process: %s", strerror(errno));
return;
}
return;
}
static bool check_cgi_path(struct path_info *pi, const char *url)
{
struct interpreter *ip;
const char *path = pi->phys;
int path_len = strlen(path);
list_for_each_entry(ip, &interpreters, list) {
int len = strlen(ip->ext);
if (len >= path_len)
continue;
if (strcmp(path + path_len - len, ip->ext) != 0)
continue;
pi->ip = ip;
return true;
}
pi->ip = NULL;
if (conf.cgi_docroot_path)
return uh_path_match(conf.cgi_docroot_path, pi->phys);
return false;
}
struct dispatch_handler cgi_dispatch = {
.script = true,
.check_path = check_cgi_path,
.handle_request = cgi_handle_request,
};
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