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openwrt/package/uhttpd/src/uhttpd.c

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/*
* uhttpd - Tiny single-threaded httpd - Main component
*
* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.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.
*/
#define _XOPEN_SOURCE 500 /* crypt() */
#include "uhttpd.h"
#include "uhttpd-utils.h"
#include "uhttpd-file.h"
#ifdef HAVE_CGI
#include "uhttpd-cgi.h"
#endif
#ifdef HAVE_LUA
#include "uhttpd-lua.h"
#endif
#ifdef HAVE_TLS
#include "uhttpd-tls.h"
#endif
static int run = 1;
static void uh_sigterm(int sig)
{
run = 0;
}
static void uh_sigchld(int sig)
{
while( waitpid(-1, NULL, WNOHANG) > 0 ) { }
}
static void uh_config_parse(struct config *conf)
{
FILE *c;
char line[512];
char *user = NULL;
char *pass = NULL;
char *eol = NULL;
const char *path = conf->file ? conf->file : "/etc/httpd.conf";
if( (c = fopen(path, "r")) != NULL )
{
memset(line, 0, sizeof(line));
while( fgets(line, sizeof(line) - 1, c) )
{
if( (line[0] == '/') && (strchr(line, ':') != NULL) )
{
if( !(user = strchr(line, ':')) || (*user++ = 0) ||
!(pass = strchr(user, ':')) || (*pass++ = 0) ||
!(eol = strchr(pass, '\n')) || (*eol++ = 0) )
continue;
if( !uh_auth_add(line, user, pass) )
{
fprintf(stderr,
"Notice: No password set for user %s, ignoring "
"authentication on %s\n", user, line
);
}
}
else if( !strncmp(line, "I:", 2) )
{
if( !(user = strchr(line, ':')) || (*user++ = 0) ||
!(eol = strchr(user, '\n')) || (*eol++ = 0) )
continue;
conf->index_file = strdup(user);
}
else if( !strncmp(line, "E404:", 5) )
{
if( !(user = strchr(line, ':')) || (*user++ = 0) ||
!(eol = strchr(user, '\n')) || (*eol++ = 0) )
continue;
conf->error_handler = strdup(user);
}
}
fclose(c);
}
}
static int uh_socket_bind(
fd_set *serv_fds, int *max_fd, const char *host, const char *port,
struct addrinfo *hints, int do_tls, struct config *conf
) {
int sock = -1;
int yes = 1;
int status;
int bound = 0;
struct listener *l = NULL;
struct addrinfo *addrs = NULL, *p = NULL;
if( (status = getaddrinfo(host, port, hints, &addrs)) != 0 )
{
fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(status));
}
/* try to bind a new socket to each found address */
for( p = addrs; p; p = p->ai_next )
{
/* get the socket */
if( (sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1 )
{
perror("socket()");
goto error;
}
/* "address already in use" */
if( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1 )
{
perror("setsockopt()");
goto error;
}
/* required to get parallel v4 + v6 working */
if( p->ai_family == AF_INET6 )
{
if( setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) == -1 )
{
perror("setsockopt()");
goto error;
}
}
/* bind */
if( bind(sock, p->ai_addr, p->ai_addrlen) == -1 )
{
perror("bind()");
goto error;
}
/* listen */
if( listen(sock, UH_LIMIT_CLIENTS) == -1 )
{
perror("listen()");
goto error;
}
/* add listener to global list */
if( ! (l = uh_listener_add(sock, conf)) )
{
fprintf(stderr,
"uh_listener_add(): Can not create more than "
"%i listen sockets\n", UH_LIMIT_LISTENERS
);
goto error;
}
#ifdef HAVE_TLS
/* init TLS */
l->tls = do_tls ? conf->tls : NULL;
#endif
/* add socket to server fd set */
FD_SET(sock, serv_fds);
fd_cloexec(sock);
*max_fd = max(*max_fd, sock);
bound++;
continue;
error:
if( sock > 0 )
close(sock);
}
freeaddrinfo(addrs);
return bound;
}
static struct http_request * uh_http_header_parse(struct client *cl, char *buffer, int buflen)
{
char *method = &buffer[0];
char *path = NULL;
char *version = NULL;
char *headers = NULL;
char *hdrname = NULL;
char *hdrdata = NULL;
int i;
int hdrcount = 0;
static struct http_request req;
memset(&req, 0, sizeof(req));
/* terminate initial header line */
if( (headers = strfind(buffer, buflen, "\r\n", 2)) != NULL )
{
buffer[buflen-1] = 0;
*headers++ = 0;
*headers++ = 0;
/* find request path */
if( (path = strchr(buffer, ' ')) != NULL )
*path++ = 0;
/* find http version */
if( (path != NULL) && ((version = strchr(path, ' ')) != NULL) )
*version++ = 0;
/* check method */
if( strcmp(method, "GET") && strcmp(method, "HEAD") && strcmp(method, "POST") )
{
/* invalid method */
uh_http_response(cl, 405, "Method Not Allowed");
return NULL;
}
else
{
switch(method[0])
{
case 'G':
req.method = UH_HTTP_MSG_GET;
break;
case 'H':
req.method = UH_HTTP_MSG_HEAD;
break;
case 'P':
req.method = UH_HTTP_MSG_POST;
break;
}
}
/* check path */
if( !path || !strlen(path) )
{
/* malformed request */
uh_http_response(cl, 400, "Bad Request");
return NULL;
}
else
{
req.url = path;
}
/* check version */
if( strcmp(version, "HTTP/0.9") && strcmp(version, "HTTP/1.0") && strcmp(version, "HTTP/1.1") )
{
/* unsupported version */
uh_http_response(cl, 400, "Bad Request");
return NULL;
}
else
{
req.version = strtof(&version[5], NULL);
}
/* process header fields */
for( i = (int)(headers - buffer); i < buflen; i++ )
{
/* found eol and have name + value, push out header tuple */
if( hdrname && hdrdata && (buffer[i] == '\r' || buffer[i] == '\n') )
{
buffer[i] = 0;
/* store */
if( (hdrcount + 1) < array_size(req.headers) )
{
req.headers[hdrcount++] = hdrname;
req.headers[hdrcount++] = hdrdata;
hdrname = hdrdata = NULL;
}
/* too large */
else
{
uh_http_response(cl, 413, "Request Entity Too Large");
return NULL;
}
}
/* have name but no value and found a colon, start of value */
else if( hdrname && !hdrdata && ((i+2) < buflen) &&
(buffer[i] == ':') && (buffer[i+1] == ' ')
) {
buffer[i] = 0;
hdrdata = &buffer[i+2];
}
/* have no name and found [A-Z], start of name */
else if( !hdrname && isalpha(buffer[i]) && isupper(buffer[i]) )
{
hdrname = &buffer[i];
}
}
/* valid enough */
req.redirect_status = 200;
return &req;
}
/* Malformed request */
uh_http_response(cl, 400, "Bad Request");
return NULL;
}
static struct http_request * uh_http_header_recv(struct client *cl)
{
static char buffer[UH_LIMIT_MSGHEAD];
char *bufptr = &buffer[0];
char *idxptr = NULL;
struct timeval timeout;
fd_set reader;
ssize_t blen = sizeof(buffer)-1;
ssize_t rlen = 0;
memset(buffer, 0, sizeof(buffer));
while( blen > 0 )
{
FD_ZERO(&reader);
FD_SET(cl->socket, &reader);
/* fail after 0.1s */
timeout.tv_sec = 0;
timeout.tv_usec = 100000;
/* check whether fd is readable */
if( select(cl->socket + 1, &reader, NULL, NULL, &timeout) > 0 )
{
/* receive data */
rlen = uh_tcp_peek(cl, bufptr, blen);
if( rlen > 0 )
{
if( (idxptr = strfind(buffer, sizeof(buffer), "\r\n\r\n", 4)) )
{
blen -= uh_tcp_recv(cl, bufptr, (int)(idxptr - bufptr) + 4);
/* header read complete ... */
return uh_http_header_parse(cl, buffer, sizeof(buffer) - blen - 1);
}
else
{
rlen = uh_tcp_recv(cl, bufptr, rlen);
blen -= rlen;
bufptr += rlen;
}
}
else
{
/* invalid request (unexpected eof/timeout) */
uh_http_response(cl, 408, "Request Timeout");
return NULL;
}
}
else
{
/* invalid request (unexpected eof/timeout) */
uh_http_response(cl, 408, "Request Timeout");
return NULL;
}
}
/* request entity too large */
uh_http_response(cl, 413, "Request Entity Too Large");
return NULL;
}
static int uh_path_match(const char *prefix, const char *url)
{
if( (strstr(url, prefix) == url) &&
((prefix[strlen(prefix)-1] == '/') ||
(strlen(url) == strlen(prefix)) ||
(url[strlen(prefix)] == '/'))
) {
return 1;
}
return 0;
}
int main (int argc, char **argv)
{
#ifdef HAVE_LUA
/* Lua runtime */
lua_State *L = NULL;
#endif
/* master file descriptor list */
fd_set used_fds, serv_fds, read_fds;
/* working structs */
struct addrinfo hints;
struct http_request *req;
struct path_info *pin;
struct client *cl;
struct sigaction sa;
struct config conf;
/* signal mask */
sigset_t ss;
/* maximum file descriptor number */
int new_fd, cur_fd, max_fd = 0;
#ifdef HAVE_TLS
int tls = 0;
int keys = 0;
#endif
int bound = 0;
int nofork = 0;
/* args */
int opt;
char bind[128];
char *port = NULL;
#if defined(HAVE_TLS) || defined(HAVE_LUA)
/* library handle */
void *lib;
#endif
/* clear the master and temp sets */
FD_ZERO(&used_fds);
FD_ZERO(&serv_fds);
FD_ZERO(&read_fds);
/* handle SIGPIPE, SIGINT, SIGTERM, SIGCHLD */
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
sa.sa_handler = uh_sigchld;
sigaction(SIGCHLD, &sa, NULL);
sa.sa_handler = uh_sigterm;
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
/* defer SIGCHLD */
sigemptyset(&ss);
sigaddset(&ss, SIGCHLD);
sigprocmask(SIG_BLOCK, &ss, NULL);
/* prepare addrinfo hints */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
/* parse args */
memset(&conf, 0, sizeof(conf));
memset(bind, 0, sizeof(bind));
#ifdef HAVE_TLS
/* load TLS plugin */
if( ! (lib = dlopen("uhttpd_tls.so", RTLD_LAZY | RTLD_GLOBAL)) )
{
fprintf(stderr,
"Notice: Unable to load TLS plugin - disabling SSL support! "
"(Reason: %s)\n", dlerror()
);
}
else
{
/* resolve functions */
if( !(conf.tls_init = dlsym(lib, "uh_tls_ctx_init")) ||
!(conf.tls_cert = dlsym(lib, "uh_tls_ctx_cert")) ||
!(conf.tls_key = dlsym(lib, "uh_tls_ctx_key")) ||
!(conf.tls_free = dlsym(lib, "uh_tls_ctx_free")) ||
!(conf.tls_accept = dlsym(lib, "uh_tls_client_accept")) ||
!(conf.tls_close = dlsym(lib, "uh_tls_client_close")) ||
!(conf.tls_recv = dlsym(lib, "uh_tls_client_recv")) ||
!(conf.tls_send = dlsym(lib, "uh_tls_client_send"))
) {
fprintf(stderr,
"Error: Failed to lookup required symbols "
"in TLS plugin: %s\n", dlerror()
);
exit(1);
}
/* init SSL context */
if( ! (conf.tls = conf.tls_init()) )
{
fprintf(stderr, "Error: Failed to initalize SSL context\n");
exit(1);
}
}
#endif
while( (opt = getopt(argc, argv,
"fSDRC:K:E:I:p:s:h:c:l:L:d:r:m:x:t:T:")) > 0
) {
switch(opt)
{
/* [addr:]port */
case 'p':
case 's':
if( (port = strrchr(optarg, ':')) != NULL )
{
if( (optarg[0] == '[') && (port > optarg) && (port[-1] == ']') )
memcpy(bind, optarg + 1,
min(sizeof(bind), (int)(port - optarg) - 2));
else
memcpy(bind, optarg,
min(sizeof(bind), (int)(port - optarg)));
port++;
}
else
{
port = optarg;
}
#ifdef HAVE_TLS
if( opt == 's' )
{
if( !conf.tls )
{
fprintf(stderr,
"Notice: TLS support is disabled, "
"ignoring '-s %s'\n", optarg
);
continue;
}
tls = 1;
}
#endif
/* bind sockets */
bound += uh_socket_bind(
&serv_fds, &max_fd, bind[0] ? bind : NULL, port,
&hints, (opt == 's'), &conf
);
memset(bind, 0, sizeof(bind));
break;
#ifdef HAVE_TLS
/* certificate */
case 'C':
if( conf.tls )
{
if( conf.tls_cert(conf.tls, optarg) < 1 )
{
fprintf(stderr,
"Error: Invalid certificate file given\n");
exit(1);
}
keys++;
}
break;
/* key */
case 'K':
if( conf.tls )
{
if( conf.tls_key(conf.tls, optarg) < 1 )
{
fprintf(stderr,
"Error: Invalid private key file given\n");
exit(1);
}
keys++;
}
break;
#endif
/* docroot */
case 'h':
if( ! realpath(optarg, conf.docroot) )
{
fprintf(stderr, "Error: Invalid directory %s: %s\n",
optarg, strerror(errno));
exit(1);
}
break;
/* error handler */
case 'E':
if( (strlen(optarg) == 0) || (optarg[0] != '/') )
{
fprintf(stderr, "Error: Invalid error handler: %s\n",
optarg);
exit(1);
}
conf.error_handler = optarg;
break;
/* index file */
case 'I':
if( (strlen(optarg) == 0) || (optarg[0] == '/') )
{
fprintf(stderr, "Error: Invalid index page: %s\n",
optarg);
exit(1);
}
conf.index_file = optarg;
break;
/* don't follow symlinks */
case 'S':
conf.no_symlinks = 1;
break;
/* don't list directories */
case 'D':
conf.no_dirlists = 1;
break;
case 'R':
conf.rfc1918_filter = 1;
break;
#ifdef HAVE_CGI
/* cgi prefix */
case 'x':
conf.cgi_prefix = optarg;
break;
#endif
#ifdef HAVE_LUA
/* lua prefix */
case 'l':
conf.lua_prefix = optarg;
break;
/* lua handler */
case 'L':
conf.lua_handler = optarg;
break;
#endif
#if defined(HAVE_CGI) || defined(HAVE_LUA)
/* script timeout */
case 't':
conf.script_timeout = atoi(optarg);
break;
#endif
/* network timeout */
case 'T':
conf.network_timeout = atoi(optarg);
break;
/* no fork */
case 'f':
nofork = 1;
break;
/* urldecode */
case 'd':
if( (port = malloc(strlen(optarg)+1)) != NULL )
{
memset(port, 0, strlen(optarg)+1);
uh_urldecode(port, strlen(optarg), optarg, strlen(optarg));
printf("%s", port);
free(port);
exit(0);
}
break;
/* basic auth realm */
case 'r':
conf.realm = optarg;
break;
/* md5 crypt */
case 'm':
printf("%s\n", crypt(optarg, "$1$"));
exit(0);
break;
/* config file */
case 'c':
conf.file = optarg;
break;
default:
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 page for directories\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"
#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_CGI
" -x string URL prefix for CGI handler, default is '/cgi-bin'\n"
#endif
#if defined(HAVE_CGI) || defined(HAVE_LUA)
" -t seconds CGI and Lua script timeout in seconds, default is 60\n"
#endif
" -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", argv[0]
);
exit(1);
}
}
#ifdef HAVE_TLS
if( (tls == 1) && (keys < 2) )
{
fprintf(stderr, "Error: Missing private key or certificate file\n");
exit(1);
}
#endif
if( bound < 1 )
{
fprintf(stderr, "Error: No sockets bound, unable to continue\n");
exit(1);
}
/* default docroot */
if( !conf.docroot[0] && !realpath(".", conf.docroot) )
{
fprintf(stderr, "Error: Can not determine default document root: %s\n",
strerror(errno));
exit(1);
}
/* default realm */
if( ! conf.realm )
conf.realm = "Protected Area";
/* config file */
uh_config_parse(&conf);
/* default network timeout */
if( conf.network_timeout <= 0 )
conf.network_timeout = 30;
#if defined(HAVE_CGI) || defined(HAVE_LUA)
/* default script timeout */
if( conf.script_timeout <= 0 )
conf.script_timeout = 60;
#endif
#ifdef HAVE_CGI
/* default cgi prefix */
if( ! conf.cgi_prefix )
conf.cgi_prefix = "/cgi-bin";
#endif
#ifdef HAVE_LUA
/* load Lua plugin */
if( ! (lib = dlopen("uhttpd_lua.so", RTLD_LAZY | RTLD_GLOBAL)) )
{
fprintf(stderr,
"Notice: Unable to load Lua plugin - disabling Lua support! "
"(Reason: %s)\n", dlerror()
);
}
else
{
/* resolve functions */
if( !(conf.lua_init = dlsym(lib, "uh_lua_init")) ||
!(conf.lua_close = dlsym(lib, "uh_lua_close")) ||
!(conf.lua_request = dlsym(lib, "uh_lua_request"))
) {
fprintf(stderr,
"Error: Failed to lookup required symbols "
"in Lua plugin: %s\n", dlerror()
);
exit(1);
}
/* init Lua runtime if handler is specified */
if( conf.lua_handler )
{
/* default lua prefix */
if( ! conf.lua_prefix )
conf.lua_prefix = "/lua";
L = conf.lua_init(conf.lua_handler);
}
}
#endif
/* fork (if not disabled) */
if( ! nofork )
{
switch( fork() )
{
case -1:
perror("fork()");
exit(1);
case 0:
/* daemon setup */
if( chdir("/") )
perror("chdir()");
if( (cur_fd = open("/dev/null", O_WRONLY)) > -1 )
dup2(cur_fd, 0);
if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
dup2(cur_fd, 1);
if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 )
dup2(cur_fd, 2);
break;
default:
exit(0);
}
}
/* backup server descriptor set */
used_fds = serv_fds;
/* loop */
while(run)
{
/* create a working copy of the used fd set */
read_fds = used_fds;
/* sleep until socket activity */
if( select(max_fd + 1, &read_fds, NULL, NULL, NULL) == -1 )
{
perror("select()");
exit(1);
}
/* run through the existing connections looking for data to be read */
for( cur_fd = 0; cur_fd <= max_fd; cur_fd++ )
{
/* is a socket managed by us */
if( FD_ISSET(cur_fd, &read_fds) )
{
/* is one of our listen sockets */
if( FD_ISSET(cur_fd, &serv_fds) )
{
/* handle new connections */
if( (new_fd = accept(cur_fd, NULL, 0)) != -1 )
{
/* add to global client list */
if( (cl = uh_client_add(new_fd, uh_listener_lookup(cur_fd))) != NULL )
{
#ifdef HAVE_TLS
/* setup client tls context */
if( conf.tls )
conf.tls_accept(cl);
#endif
/* add client socket to global fdset */
FD_SET(new_fd, &used_fds);
fd_cloexec(new_fd);
max_fd = max(max_fd, new_fd);
}
/* insufficient resources */
else
{
fprintf(stderr,
"uh_client_add(): Can not manage more than "
"%i client sockets, connection dropped\n",
UH_LIMIT_CLIENTS
);
close(new_fd);
}
}
}
/* is a client socket */
else
{
if( ! (cl = uh_client_lookup(cur_fd)) )
{
/* this should not happen! */
fprintf(stderr,
"uh_client_lookup(): No entry for fd %i!\n",
cur_fd);
goto cleanup;
}
/* parse message header */
if( (req = uh_http_header_recv(cl)) != NULL )
{
/* RFC1918 filtering required? */
if( conf.rfc1918_filter && sa_rfc1918(&cl->peeraddr) &&
!sa_rfc1918(&cl->servaddr) )
{
uh_http_sendhf(cl, 403, "Forbidden",
"Rejected request from RFC1918 IP to public server address");
}
else
#ifdef HAVE_LUA
/* Lua request? */
if( L && uh_path_match(conf.lua_prefix, req->url) )
{
conf.lua_request(cl, req, L);
}
else
#endif
/* dispatch request */
if( (pin = uh_path_lookup(cl, req->url)) != NULL )
{
/* auth ok? */
if( uh_auth_check(cl, req, pin) )
{
#ifdef HAVE_CGI
if( uh_path_match(conf.cgi_prefix, pin->name) )
{
uh_cgi_request(cl, req, pin);
}
else
#endif
{
uh_file_request(cl, req, pin);
}
}
}
/* 404 */
else
{
/* Try to invoke an error handler */
pin = uh_path_lookup(cl, conf.error_handler);
if( pin && uh_auth_check(cl, req, pin) )
{
req->redirect_status = 404;
#ifdef HAVE_CGI
if( uh_path_match(conf.cgi_prefix, pin->name) )
{
uh_cgi_request(cl, req, pin);
}
else
#endif
{
uh_file_request(cl, req, pin);
}
}
else
{
uh_http_sendhf(cl, 404, "Not Found",
"No such file or directory");
}
}
}
/* 400 */
else
{
uh_http_sendhf(cl, 400, "Bad Request",
"Malformed request received");
}
#ifdef HAVE_TLS
/* free client tls context */
if( conf.tls )
conf.tls_close(cl);
#endif
cleanup:
/* close client socket */
close(cur_fd);
FD_CLR(cur_fd, &used_fds);
/* remove from global client list */
uh_client_remove(cur_fd);
}
}
}
}
#ifdef HAVE_LUA
/* destroy the Lua state */
if( L != NULL )
conf.lua_close(L);
#endif
return 0;
}
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