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/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <getopt.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>
#include <libubox/usock.h>
#include "uhttpd.h"
char uh_buf[4096];
static int run_server(void)
{
uloop_init();
uh_setup_listeners();
uloop_run();
return 0;
}
static void uh_config_parse(void)
{
const char *path = conf.file;
FILE *c;
char line[512];
char *col1;
char *col2;
char *eol;
if (!path)
path = "/etc/httpd.conf";
c = fopen(path, "r");
if (!c)
return;
memset(line, 0, sizeof(line));
while (fgets(line, sizeof(line) - 1, c)) {
if ((line[0] == '/') && (strchr(line, ':') != NULL)) {
if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
!(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
!(eol = strchr(col2, '\n')) || (*eol++ = 0))
continue;
uh_auth_add(line, col1, col2);
} else if (!strncmp(line, "I:", 2)) {
if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
!(eol = strchr(col1, '\n')) || (*eol++ = 0))
continue;
uh_index_add(strdup(col1));
} else if (!strncmp(line, "E404:", 5)) {
if (!(col1 = strchr(line, ':')) || (*col1++ = 0) ||
!(eol = strchr(col1, '\n')) || (*eol++ = 0))
continue;
conf.error_handler = strdup(col1);
}
#ifdef HAVE_CGI
else if ((line[0] == '*') && (strchr(line, ':') != NULL)) {
if (!(col1 = strchr(line, '*')) || (*col1++ = 0) ||
!(col2 = strchr(col1, ':')) || (*col2++ = 0) ||
!(eol = strchr(col2, '\n')) || (*eol++ = 0))
continue;
if (!uh_interpreter_add(col1, col2))
fprintf(stderr,
"Unable to add interpreter %s for extension %s: "
"Out of memory\n", col2, col1
);
}
#endif
}
fclose(c);
}
static int add_listener_arg(char *arg, bool tls)
{
char *host = NULL;
char *port = arg;
char *s;
s = strrchr(arg, ':');
if (s) {
host = arg;
port = s + 1;
*s = 0;
}
return uh_socket_bind(host, port, tls);
}
static int usage(const char *name)
{
fprintf(stderr,
"Usage: %s -p [addr:]port -h docroot\n"
" -f Do not fork to background\n"
" -c file Configuration file, default is '/etc/httpd.conf'\n"
" -p [addr:]port Bind to specified address and port, multiple allowed\n"
#ifdef HAVE_TLS
" -s [addr:]port Like -p but provide HTTPS on this port\n"
" -C file ASN.1 server certificate file\n"
" -K file ASN.1 server private key file\n"
#endif
" -h directory Specify the document root, default is '.'\n"
" -E string Use given virtual URL as 404 error handler\n"
" -I string Use given filename as index for directories, multiple allowed\n"
" -S Do not follow symbolic links outside of the docroot\n"
" -D Do not allow directory listings, send 403 instead\n"
" -R Enable RFC1918 filter\n"
" -n count Maximum allowed number of concurrent requests\n"
#ifdef HAVE_LUA
" -l string URL prefix for Lua handler, default is '/lua'\n"
" -L file Lua handler script, omit to disable Lua\n"
#endif
#ifdef HAVE_UBUS
" -u string URL prefix for HTTP/JSON handler\n"
" -U file Override ubus socket path\n"
#endif
" -x string URL prefix for CGI handler, default is '/cgi-bin'\n"
" -i .ext=path Use interpreter at path for files with the given extension\n"
" -t seconds CGI, Lua and UBUS script timeout in seconds, default is 60\n"
" -T seconds Network timeout in seconds, default is 30\n"
" -d string URL decode given string\n"
" -r string Specify basic auth realm\n"
" -m string MD5 crypt given string\n"
"\n", name
);
return 1;
}
static void init_defaults(void)
{
conf.script_timeout = 60;
conf.network_timeout = 30;
conf.http_keepalive = 0; /* fixme */
conf.max_requests = 3;
conf.realm = "Protected Area";
conf.cgi_prefix = "/cgi-bin";
conf.cgi_path = "/sbin:/usr/sbin:/bin:/usr/bin";
uh_index_add("index.html");
uh_index_add("index.htm");
uh_index_add("default.html");
uh_index_add("default.htm");
}
static void fixup_prefix(char *str)
{
int len;
if (!str || !str[0])
return;
len = strlen(str) - 1;
while (len > 0 && str[len] == '/')
len--;
str[len + 1] = 0;
}
int main(int argc, char **argv)
{
bool nofork = false;
char *port;
int opt, ch;
int cur_fd;
int bound = 0;
BUILD_BUG_ON(sizeof(uh_buf) < PATH_MAX);
uh_dispatch_add(&cgi_dispatch);
init_defaults();
signal(SIGPIPE, SIG_IGN);
while ((ch = getopt(argc, argv, "fSDRC:K:E:I:p:s:h:c:l:L:d:r:m:n:x:i:t:T:A:u:U:")) != -1) {
bool tls = false;
switch(ch) {
case 's':
tls = true;
/* fall through */
case 'p':
bound += add_listener_arg(optarg, tls);
break;
case 'h':
if (!realpath(optarg, uh_buf)) {
fprintf(stderr, "Error: Invalid directory %s: %s\n",
optarg, strerror(errno));
exit(1);
}
conf.docroot = strdup(uh_buf);
break;
case 'E':
if (optarg[0] != '/') {
fprintf(stderr, "Error: Invalid error handler: %s\n",
optarg);
exit(1);
}
conf.error_handler = optarg;
break;
case 'I':
if (optarg[0] == '/') {
fprintf(stderr, "Error: Invalid index page: %s\n",
optarg);
exit(1);
}
uh_index_add(optarg);
break;
case 'S':
conf.no_symlinks = 1;
break;
case 'D':
conf.no_dirlists = 1;
break;
case 'R':
conf.rfc1918_filter = 1;
break;
case 'n':
conf.max_requests = atoi(optarg);
break;
case 'x':
fixup_prefix(optarg);
conf.cgi_prefix = optarg;
break;
case 'i':
port = strchr(optarg, '=');
if (optarg[0] != '.' || !port) {
fprintf(stderr, "Error: Invalid interpreter: %s\n",
optarg);
exit(1);
}
*port++ = 0;
uh_interpreter_add(optarg, port);
break;
case 't':
conf.script_timeout = atoi(optarg);
break;
case 'T':
conf.network_timeout = atoi(optarg);
break;
case 'A':
conf.tcp_keepalive = atoi(optarg);
break;
case 'f':
nofork = 1;
break;
case 'd':
port = alloca(strlen(optarg) + 1);
if (!port)
return -1;
/* "decode" plus to space to retain compat */
for (opt = 0; optarg[opt]; opt++)
if (optarg[opt] == '+')
optarg[opt] = ' ';
/* opt now contains strlen(optarg) -- no need to re-scan */
if (uh_urldecode(port, opt, optarg, opt) < 0) {
fprintf(stderr, "uhttpd: invalid encoding\n");
return -1;
}
printf("%s", port);
break;
/* basic auth realm */
case 'r':
conf.realm = optarg;
break;
/* md5 crypt */
case 'm':
printf("%s\n", crypt(optarg, "$1$"));
return 0;
break;
/* config file */
case 'c':
conf.file = optarg;
break;
default:
return usage(argv[0]);
}
}
uh_config_parse();
if (!bound) {
fprintf(stderr, "Error: No sockets bound, unable to continue\n");
return 1;
}
/* fork (if not disabled) */
if (!nofork) {
switch (fork()) {
case -1:
perror("fork()");
exit(1);
case 0:
/* daemon setup */
if (chdir("/"))
perror("chdir()");
cur_fd = open("/dev/null", O_WRONLY);
if (cur_fd > 0) {
dup2(cur_fd, 0);
dup2(cur_fd, 1);
dup2(cur_fd, 2);
}
break;
default:
exit(0);
}
}
return run_server();
}
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